1 /*
2 * Copyright © 2010 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 /**
25 * \file ast_to_hir.c
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
27 *
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
30 *
31 * * Symbol table management
32 * * Type checking
33 * * Function binding
34 *
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
43 *
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
47 *
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
50 */
51
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
54 #include "ast.h"
55 #include "compiler/glsl_types.h"
56 #include "util/hash_table.h"
57 #include "main/mtypes.h"
58 #include "main/macros.h"
59 #include "main/shaderobj.h"
60 #include "ir.h"
61 #include "ir_builder.h"
62 #include "builtin_functions.h"
63
64 using namespace ir_builder;
65
66 static void
67 detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
68 exec_list *instructions);
69 static void
70 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state *state);
71
72 static void
73 remove_per_vertex_blocks(exec_list *instructions,
74 _mesa_glsl_parse_state *state, ir_variable_mode mode);
75
76 /**
77 * Visitor class that finds the first instance of any write-only variable that
78 * is ever read, if any
79 */
80 class read_from_write_only_variable_visitor : public ir_hierarchical_visitor
81 {
82 public:
read_from_write_only_variable_visitor()83 read_from_write_only_variable_visitor() : found(NULL)
84 {
85 }
86
visit(ir_dereference_variable * ir)87 virtual ir_visitor_status visit(ir_dereference_variable *ir)
88 {
89 if (this->in_assignee)
90 return visit_continue;
91
92 ir_variable *var = ir->variable_referenced();
93 /* We can have memory_write_only set on both images and buffer variables,
94 * but in the former there is a distinction between reads from
95 * the variable itself (write_only) and from the memory they point to
96 * (memory_write_only), while in the case of buffer variables there is
97 * no such distinction, that is why this check here is limited to
98 * buffer variables alone.
99 */
100 if (!var || var->data.mode != ir_var_shader_storage)
101 return visit_continue;
102
103 if (var->data.memory_write_only) {
104 found = var;
105 return visit_stop;
106 }
107
108 return visit_continue;
109 }
110
get_variable()111 ir_variable *get_variable() {
112 return found;
113 }
114
visit_enter(ir_expression * ir)115 virtual ir_visitor_status visit_enter(ir_expression *ir)
116 {
117 /* .length() doesn't actually read anything */
118 if (ir->operation == ir_unop_ssbo_unsized_array_length)
119 return visit_continue_with_parent;
120
121 return visit_continue;
122 }
123
124 private:
125 ir_variable *found;
126 };
127
128 void
_mesa_ast_to_hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)129 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
130 {
131 _mesa_glsl_initialize_variables(instructions, state);
132
133 state->symbols->separate_function_namespace = state->language_version == 110;
134
135 state->current_function = NULL;
136
137 state->toplevel_ir = instructions;
138
139 state->gs_input_prim_type_specified = false;
140 state->tcs_output_vertices_specified = false;
141 state->cs_input_local_size_specified = false;
142
143 /* Section 4.2 of the GLSL 1.20 specification states:
144 * "The built-in functions are scoped in a scope outside the global scope
145 * users declare global variables in. That is, a shader's global scope,
146 * available for user-defined functions and global variables, is nested
147 * inside the scope containing the built-in functions."
148 *
149 * Since built-in functions like ftransform() access built-in variables,
150 * it follows that those must be in the outer scope as well.
151 *
152 * We push scope here to create this nesting effect...but don't pop.
153 * This way, a shader's globals are still in the symbol table for use
154 * by the linker.
155 */
156 state->symbols->push_scope();
157
158 foreach_list_typed (ast_node, ast, link, & state->translation_unit)
159 ast->hir(instructions, state);
160
161 verify_subroutine_associated_funcs(state);
162 detect_recursion_unlinked(state, instructions);
163 detect_conflicting_assignments(state, instructions);
164
165 state->toplevel_ir = NULL;
166
167 /* Move all of the variable declarations to the front of the IR list, and
168 * reverse the order. This has the (intended!) side effect that vertex
169 * shader inputs and fragment shader outputs will appear in the IR in the
170 * same order that they appeared in the shader code. This results in the
171 * locations being assigned in the declared order. Many (arguably buggy)
172 * applications depend on this behavior, and it matches what nearly all
173 * other drivers do.
174 * However, do not push the declarations before struct decls or precision
175 * statements.
176 */
177 ir_instruction* before_node = (ir_instruction*)instructions->get_head();
178 ir_instruction* after_node = NULL;
179 while (before_node && (before_node->ir_type == ir_type_precision || before_node->ir_type == ir_type_typedecl))
180 {
181 after_node = before_node;
182 before_node = (ir_instruction*)before_node->next;
183 }
184
185 foreach_in_list_safe(ir_instruction, node, instructions) {
186 ir_variable *const var = node->as_variable();
187
188 if (var == NULL)
189 continue;
190
191 var->remove();
192 if (after_node)
193 after_node->insert_after(var);
194 else
195 instructions->push_head(var);
196 }
197
198 /* Figure out if gl_FragCoord is actually used in fragment shader */
199 ir_variable *const var = state->symbols->get_variable("gl_FragCoord");
200 if (var != NULL)
201 state->fs_uses_gl_fragcoord = var->data.used;
202
203 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
204 *
205 * If multiple shaders using members of a built-in block belonging to
206 * the same interface are linked together in the same program, they
207 * must all redeclare the built-in block in the same way, as described
208 * in section 4.3.7 "Interface Blocks" for interface block matching, or
209 * a link error will result.
210 *
211 * The phrase "using members of a built-in block" implies that if two
212 * shaders are linked together and one of them *does not use* any members
213 * of the built-in block, then that shader does not need to have a matching
214 * redeclaration of the built-in block.
215 *
216 * This appears to be a clarification to the behaviour established for
217 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
218 * version.
219 *
220 * The definition of "interface" in section 4.3.7 that applies here is as
221 * follows:
222 *
223 * The boundary between adjacent programmable pipeline stages: This
224 * spans all the outputs in all compilation units of the first stage
225 * and all the inputs in all compilation units of the second stage.
226 *
227 * Therefore this rule applies to both inter- and intra-stage linking.
228 *
229 * The easiest way to implement this is to check whether the shader uses
230 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
231 * remove all the relevant variable declaration from the IR, so that the
232 * linker won't see them and complain about mismatches.
233 */
234 remove_per_vertex_blocks(instructions, state, ir_var_shader_in);
235 remove_per_vertex_blocks(instructions, state, ir_var_shader_out);
236
237 /* Check that we don't have reads from write-only variables */
238 read_from_write_only_variable_visitor v;
239 v.run(instructions);
240 ir_variable *error_var = v.get_variable();
241 if (error_var) {
242 /* It would be nice to have proper location information, but for that
243 * we would need to check this as we process each kind of AST node
244 */
245 YYLTYPE loc;
246 memset(&loc, 0, sizeof(loc));
247 _mesa_glsl_error(&loc, state, "Read from write-only variable `%s'",
248 error_var->name);
249 }
250 }
251
252
253 static ir_expression_operation
get_implicit_conversion_operation(const glsl_type * to,const glsl_type * from,struct _mesa_glsl_parse_state * state)254 get_implicit_conversion_operation(const glsl_type *to, const glsl_type *from,
255 struct _mesa_glsl_parse_state *state)
256 {
257 switch (to->base_type) {
258 case GLSL_TYPE_FLOAT:
259 switch (from->base_type) {
260 case GLSL_TYPE_INT: return ir_unop_i2f;
261 case GLSL_TYPE_UINT: return ir_unop_u2f;
262 default: return (ir_expression_operation)0;
263 }
264
265 case GLSL_TYPE_UINT:
266 if (!state->has_implicit_uint_to_int_conversion())
267 return (ir_expression_operation)0;
268 switch (from->base_type) {
269 case GLSL_TYPE_INT: return ir_unop_i2u;
270 default: return (ir_expression_operation)0;
271 }
272
273 case GLSL_TYPE_DOUBLE:
274 if (!state->has_double())
275 return (ir_expression_operation)0;
276 switch (from->base_type) {
277 case GLSL_TYPE_INT: return ir_unop_i2d;
278 case GLSL_TYPE_UINT: return ir_unop_u2d;
279 case GLSL_TYPE_FLOAT: return ir_unop_f2d;
280 case GLSL_TYPE_INT64: return ir_unop_i642d;
281 case GLSL_TYPE_UINT64: return ir_unop_u642d;
282 default: return (ir_expression_operation)0;
283 }
284
285 case GLSL_TYPE_UINT64:
286 if (!state->has_int64())
287 return (ir_expression_operation)0;
288 switch (from->base_type) {
289 case GLSL_TYPE_INT: return ir_unop_i2u64;
290 case GLSL_TYPE_UINT: return ir_unop_u2u64;
291 case GLSL_TYPE_INT64: return ir_unop_i642u64;
292 default: return (ir_expression_operation)0;
293 }
294
295 case GLSL_TYPE_INT64:
296 if (!state->has_int64())
297 return (ir_expression_operation)0;
298 switch (from->base_type) {
299 case GLSL_TYPE_INT: return ir_unop_i2i64;
300 default: return (ir_expression_operation)0;
301 }
302
303 default: return (ir_expression_operation)0;
304 }
305 }
306
307
308 /**
309 * If a conversion is available, convert one operand to a different type
310 *
311 * The \c from \c ir_rvalue is converted "in place".
312 *
313 * \param to Type that the operand it to be converted to
314 * \param from Operand that is being converted
315 * \param state GLSL compiler state
316 *
317 * \return
318 * If a conversion is possible (or unnecessary), \c true is returned.
319 * Otherwise \c false is returned.
320 */
321 static bool
apply_implicit_conversion(const glsl_type * to,ir_rvalue * & from,struct _mesa_glsl_parse_state * state)322 apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
323 struct _mesa_glsl_parse_state *state)
324 {
325 void *ctx = state;
326 if (to->base_type == from->type->base_type)
327 return true;
328
329 /* Prior to GLSL 1.20, there are no implicit conversions */
330 if (!state->has_implicit_conversions())
331 return false;
332
333 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
334 *
335 * "There are no implicit array or structure conversions. For
336 * example, an array of int cannot be implicitly converted to an
337 * array of float.
338 */
339 if (!to->is_numeric() || !from->type->is_numeric())
340 return false;
341
342 /* We don't actually want the specific type `to`, we want a type
343 * with the same base type as `to`, but the same vector width as
344 * `from`.
345 */
346 to = glsl_type::get_instance(to->base_type, from->type->vector_elements,
347 from->type->matrix_columns);
348
349 ir_expression_operation op = get_implicit_conversion_operation(to, from->type, state);
350 if (op) {
351 from = new(ctx) ir_expression(op, to, from, NULL);
352 return true;
353 } else {
354 return false;
355 }
356 }
357
358
359 static const struct glsl_type *
arithmetic_result_type(ir_rvalue * & value_a,ir_rvalue * & value_b,bool multiply,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)360 arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
361 bool multiply,
362 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
363 {
364 const glsl_type *type_a = value_a->type;
365 const glsl_type *type_b = value_b->type;
366
367 /* From GLSL 1.50 spec, page 56:
368 *
369 * "The arithmetic binary operators add (+), subtract (-),
370 * multiply (*), and divide (/) operate on integer and
371 * floating-point scalars, vectors, and matrices."
372 */
373 if (!type_a->is_numeric() || !type_b->is_numeric()) {
374 _mesa_glsl_error(loc, state,
375 "operands to arithmetic operators must be numeric");
376 return glsl_type::error_type;
377 }
378
379
380 /* "If one operand is floating-point based and the other is
381 * not, then the conversions from Section 4.1.10 "Implicit
382 * Conversions" are applied to the non-floating-point-based operand."
383 */
384 if (!apply_implicit_conversion(type_a, value_b, state)
385 && !apply_implicit_conversion(type_b, value_a, state)) {
386 _mesa_glsl_error(loc, state,
387 "could not implicitly convert operands to "
388 "arithmetic operator");
389 return glsl_type::error_type;
390 }
391 type_a = value_a->type;
392 type_b = value_b->type;
393
394 /* "If the operands are integer types, they must both be signed or
395 * both be unsigned."
396 *
397 * From this rule and the preceeding conversion it can be inferred that
398 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
399 * The is_numeric check above already filtered out the case where either
400 * type is not one of these, so now the base types need only be tested for
401 * equality.
402 */
403 if (type_a->base_type != type_b->base_type) {
404 _mesa_glsl_error(loc, state,
405 "base type mismatch for arithmetic operator");
406 return glsl_type::error_type;
407 }
408
409 /* "All arithmetic binary operators result in the same fundamental type
410 * (signed integer, unsigned integer, or floating-point) as the
411 * operands they operate on, after operand type conversion. After
412 * conversion, the following cases are valid
413 *
414 * * The two operands are scalars. In this case the operation is
415 * applied, resulting in a scalar."
416 */
417 if (type_a->is_scalar() && type_b->is_scalar())
418 return type_a;
419
420 /* "* One operand is a scalar, and the other is a vector or matrix.
421 * In this case, the scalar operation is applied independently to each
422 * component of the vector or matrix, resulting in the same size
423 * vector or matrix."
424 */
425 if (type_a->is_scalar()) {
426 if (!type_b->is_scalar())
427 return type_b;
428 } else if (type_b->is_scalar()) {
429 return type_a;
430 }
431
432 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
433 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
434 * handled.
435 */
436 assert(!type_a->is_scalar());
437 assert(!type_b->is_scalar());
438
439 /* "* The two operands are vectors of the same size. In this case, the
440 * operation is done component-wise resulting in the same size
441 * vector."
442 */
443 if (type_a->is_vector() && type_b->is_vector()) {
444 if (type_a == type_b) {
445 return type_a;
446 } else {
447 _mesa_glsl_error(loc, state,
448 "vector size mismatch for arithmetic operator");
449 return glsl_type::error_type;
450 }
451 }
452
453 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
454 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
455 * <vector, vector> have been handled. At least one of the operands must
456 * be matrix. Further, since there are no integer matrix types, the base
457 * type of both operands must be float.
458 */
459 assert(type_a->is_matrix() || type_b->is_matrix());
460 assert(type_a->is_float() || type_a->is_double());
461 assert(type_b->is_float() || type_b->is_double());
462
463 /* "* The operator is add (+), subtract (-), or divide (/), and the
464 * operands are matrices with the same number of rows and the same
465 * number of columns. In this case, the operation is done component-
466 * wise resulting in the same size matrix."
467 * * The operator is multiply (*), where both operands are matrices or
468 * one operand is a vector and the other a matrix. A right vector
469 * operand is treated as a column vector and a left vector operand as a
470 * row vector. In all these cases, it is required that the number of
471 * columns of the left operand is equal to the number of rows of the
472 * right operand. Then, the multiply (*) operation does a linear
473 * algebraic multiply, yielding an object that has the same number of
474 * rows as the left operand and the same number of columns as the right
475 * operand. Section 5.10 "Vector and Matrix Operations" explains in
476 * more detail how vectors and matrices are operated on."
477 */
478 if (! multiply) {
479 if (type_a == type_b)
480 return type_a;
481 } else {
482 const glsl_type *type = glsl_type::get_mul_type(type_a, type_b);
483
484 if (type == glsl_type::error_type) {
485 _mesa_glsl_error(loc, state,
486 "size mismatch for matrix multiplication");
487 }
488
489 return type;
490 }
491
492
493 /* "All other cases are illegal."
494 */
495 _mesa_glsl_error(loc, state, "type mismatch");
496 return glsl_type::error_type;
497 }
498
499
500 static const struct glsl_type *
unary_arithmetic_result_type(const struct glsl_type * type,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)501 unary_arithmetic_result_type(const struct glsl_type *type,
502 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
503 {
504 /* From GLSL 1.50 spec, page 57:
505 *
506 * "The arithmetic unary operators negate (-), post- and pre-increment
507 * and decrement (-- and ++) operate on integer or floating-point
508 * values (including vectors and matrices). All unary operators work
509 * component-wise on their operands. These result with the same type
510 * they operated on."
511 */
512 if (!type->is_numeric()) {
513 _mesa_glsl_error(loc, state,
514 "operands to arithmetic operators must be numeric");
515 return glsl_type::error_type;
516 }
517
518 return type;
519 }
520
521 /**
522 * \brief Return the result type of a bit-logic operation.
523 *
524 * If the given types to the bit-logic operator are invalid, return
525 * glsl_type::error_type.
526 *
527 * \param value_a LHS of bit-logic op
528 * \param value_b RHS of bit-logic op
529 */
530 static const struct glsl_type *
bit_logic_result_type(ir_rvalue * & value_a,ir_rvalue * & value_b,ast_operators op,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)531 bit_logic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
532 ast_operators op,
533 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
534 {
535 const glsl_type *type_a = value_a->type;
536 const glsl_type *type_b = value_b->type;
537
538 if (!state->check_bitwise_operations_allowed(loc)) {
539 return glsl_type::error_type;
540 }
541
542 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
543 *
544 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
545 * (|). The operands must be of type signed or unsigned integers or
546 * integer vectors."
547 */
548 if (!type_a->is_integer_32_64()) {
549 _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
550 ast_expression::operator_string(op));
551 return glsl_type::error_type;
552 }
553 if (!type_b->is_integer_32_64()) {
554 _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
555 ast_expression::operator_string(op));
556 return glsl_type::error_type;
557 }
558
559 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
560 * make sense for bitwise operations, as they don't operate on floats.
561 *
562 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
563 * here. It wasn't clear whether or not we should apply them to bitwise
564 * operations. However, Khronos has decided that they should in future
565 * language revisions. Applications also rely on this behavior. We opt
566 * to apply them in general, but issue a portability warning.
567 *
568 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
569 */
570 if (type_a->base_type != type_b->base_type) {
571 if (!apply_implicit_conversion(type_a, value_b, state)
572 && !apply_implicit_conversion(type_b, value_a, state)) {
573 _mesa_glsl_error(loc, state,
574 "could not implicitly convert operands to "
575 "`%s` operator",
576 ast_expression::operator_string(op));
577 return glsl_type::error_type;
578 } else {
579 _mesa_glsl_warning(loc, state,
580 "some implementations may not support implicit "
581 "int -> uint conversions for `%s' operators; "
582 "consider casting explicitly for portability",
583 ast_expression::operator_string(op));
584 }
585 type_a = value_a->type;
586 type_b = value_b->type;
587 }
588
589 /* "The fundamental types of the operands (signed or unsigned) must
590 * match,"
591 */
592 if (type_a->base_type != type_b->base_type) {
593 _mesa_glsl_error(loc, state, "operands of `%s' must have the same "
594 "base type", ast_expression::operator_string(op));
595 return glsl_type::error_type;
596 }
597
598 /* "The operands cannot be vectors of differing size." */
599 if (type_a->is_vector() &&
600 type_b->is_vector() &&
601 type_a->vector_elements != type_b->vector_elements) {
602 _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
603 "different sizes", ast_expression::operator_string(op));
604 return glsl_type::error_type;
605 }
606
607 /* "If one operand is a scalar and the other a vector, the scalar is
608 * applied component-wise to the vector, resulting in the same type as
609 * the vector. The fundamental types of the operands [...] will be the
610 * resulting fundamental type."
611 */
612 if (type_a->is_scalar())
613 return type_b;
614 else
615 return type_a;
616 }
617
618 static const struct glsl_type *
modulus_result_type(ir_rvalue * & value_a,ir_rvalue * & value_b,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)619 modulus_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
620 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
621 {
622 const glsl_type *type_a = value_a->type;
623 const glsl_type *type_b = value_b->type;
624
625 if (!state->EXT_gpu_shader4_enable &&
626 !state->check_version(130, 300, loc, "operator '%%' is reserved")) {
627 return glsl_type::error_type;
628 }
629
630 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
631 *
632 * "The operator modulus (%) operates on signed or unsigned integers or
633 * integer vectors."
634 */
635 if (!type_a->is_integer_32_64()) {
636 _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer");
637 return glsl_type::error_type;
638 }
639 if (!type_b->is_integer_32_64()) {
640 _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer");
641 return glsl_type::error_type;
642 }
643
644 /* "If the fundamental types in the operands do not match, then the
645 * conversions from section 4.1.10 "Implicit Conversions" are applied
646 * to create matching types."
647 *
648 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
649 * int -> uint conversion rules. Prior to that, there were no implicit
650 * conversions. So it's harmless to apply them universally - no implicit
651 * conversions will exist. If the types don't match, we'll receive false,
652 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
653 *
654 * "The operand types must both be signed or unsigned."
655 */
656 if (!apply_implicit_conversion(type_a, value_b, state) &&
657 !apply_implicit_conversion(type_b, value_a, state)) {
658 _mesa_glsl_error(loc, state,
659 "could not implicitly convert operands to "
660 "modulus (%%) operator");
661 return glsl_type::error_type;
662 }
663 type_a = value_a->type;
664 type_b = value_b->type;
665
666 /* "The operands cannot be vectors of differing size. If one operand is
667 * a scalar and the other vector, then the scalar is applied component-
668 * wise to the vector, resulting in the same type as the vector. If both
669 * are vectors of the same size, the result is computed component-wise."
670 */
671 if (type_a->is_vector()) {
672 if (!type_b->is_vector()
673 || (type_a->vector_elements == type_b->vector_elements))
674 return type_a;
675 } else
676 return type_b;
677
678 /* "The operator modulus (%) is not defined for any other data types
679 * (non-integer types)."
680 */
681 _mesa_glsl_error(loc, state, "type mismatch");
682 return glsl_type::error_type;
683 }
684
685
686 static const struct glsl_type *
relational_result_type(ir_rvalue * & value_a,ir_rvalue * & value_b,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)687 relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
688 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
689 {
690 const glsl_type *type_a = value_a->type;
691 const glsl_type *type_b = value_b->type;
692
693 /* From GLSL 1.50 spec, page 56:
694 * "The relational operators greater than (>), less than (<), greater
695 * than or equal (>=), and less than or equal (<=) operate only on
696 * scalar integer and scalar floating-point expressions."
697 */
698 if (!type_a->is_numeric()
699 || !type_b->is_numeric()
700 || !type_a->is_scalar()
701 || !type_b->is_scalar()) {
702 _mesa_glsl_error(loc, state,
703 "operands to relational operators must be scalar and "
704 "numeric");
705 return glsl_type::error_type;
706 }
707
708 /* "Either the operands' types must match, or the conversions from
709 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
710 * operand, after which the types must match."
711 */
712 if (!apply_implicit_conversion(type_a, value_b, state)
713 && !apply_implicit_conversion(type_b, value_a, state)) {
714 _mesa_glsl_error(loc, state,
715 "could not implicitly convert operands to "
716 "relational operator");
717 return glsl_type::error_type;
718 }
719 type_a = value_a->type;
720 type_b = value_b->type;
721
722 if (type_a->base_type != type_b->base_type) {
723 _mesa_glsl_error(loc, state, "base type mismatch");
724 return glsl_type::error_type;
725 }
726
727 /* "The result is scalar Boolean."
728 */
729 return glsl_type::bool_type;
730 }
731
732 /**
733 * \brief Return the result type of a bit-shift operation.
734 *
735 * If the given types to the bit-shift operator are invalid, return
736 * glsl_type::error_type.
737 *
738 * \param type_a Type of LHS of bit-shift op
739 * \param type_b Type of RHS of bit-shift op
740 */
741 static const struct glsl_type *
shift_result_type(const struct glsl_type * type_a,const struct glsl_type * type_b,ast_operators op,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)742 shift_result_type(const struct glsl_type *type_a,
743 const struct glsl_type *type_b,
744 ast_operators op,
745 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
746 {
747 if (!state->check_bitwise_operations_allowed(loc)) {
748 return glsl_type::error_type;
749 }
750
751 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
752 *
753 * "The shift operators (<<) and (>>). For both operators, the operands
754 * must be signed or unsigned integers or integer vectors. One operand
755 * can be signed while the other is unsigned."
756 */
757 if (!type_a->is_integer_32_64()) {
758 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
759 "integer vector", ast_expression::operator_string(op));
760 return glsl_type::error_type;
761
762 }
763 if (!type_b->is_integer_32()) {
764 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
765 "integer vector", ast_expression::operator_string(op));
766 return glsl_type::error_type;
767 }
768
769 /* "If the first operand is a scalar, the second operand has to be
770 * a scalar as well."
771 */
772 if (type_a->is_scalar() && !type_b->is_scalar()) {
773 _mesa_glsl_error(loc, state, "if the first operand of %s is scalar, the "
774 "second must be scalar as well",
775 ast_expression::operator_string(op));
776 return glsl_type::error_type;
777 }
778
779 /* If both operands are vectors, check that they have same number of
780 * elements.
781 */
782 if (type_a->is_vector() &&
783 type_b->is_vector() &&
784 type_a->vector_elements != type_b->vector_elements) {
785 _mesa_glsl_error(loc, state, "vector operands to operator %s must "
786 "have same number of elements",
787 ast_expression::operator_string(op));
788 return glsl_type::error_type;
789 }
790
791 /* "In all cases, the resulting type will be the same type as the left
792 * operand."
793 */
794 return type_a;
795 }
796
797 /**
798 * Returns the innermost array index expression in an rvalue tree.
799 * This is the largest indexing level -- if an array of blocks, then
800 * it is the block index rather than an indexing expression for an
801 * array-typed member of an array of blocks.
802 */
803 static ir_rvalue *
find_innermost_array_index(ir_rvalue * rv)804 find_innermost_array_index(ir_rvalue *rv)
805 {
806 ir_dereference_array *last = NULL;
807 while (rv) {
808 if (rv->as_dereference_array()) {
809 last = rv->as_dereference_array();
810 rv = last->array;
811 } else if (rv->as_dereference_record())
812 rv = rv->as_dereference_record()->record;
813 else if (rv->as_swizzle())
814 rv = rv->as_swizzle()->val;
815 else
816 rv = NULL;
817 }
818
819 if (last)
820 return last->array_index;
821
822 return NULL;
823 }
824
825 /**
826 * Validates that a value can be assigned to a location with a specified type
827 *
828 * Validates that \c rhs can be assigned to some location. If the types are
829 * not an exact match but an automatic conversion is possible, \c rhs will be
830 * converted.
831 *
832 * \return
833 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
834 * Otherwise the actual RHS to be assigned will be returned. This may be
835 * \c rhs, or it may be \c rhs after some type conversion.
836 *
837 * \note
838 * In addition to being used for assignments, this function is used to
839 * type-check return values.
840 */
841 static ir_rvalue *
validate_assignment(struct _mesa_glsl_parse_state * state,YYLTYPE loc,ir_rvalue * lhs,ir_rvalue * rhs,bool is_initializer)842 validate_assignment(struct _mesa_glsl_parse_state *state,
843 YYLTYPE loc, ir_rvalue *lhs,
844 ir_rvalue *rhs, bool is_initializer)
845 {
846 /* If there is already some error in the RHS, just return it. Anything
847 * else will lead to an avalanche of error message back to the user.
848 */
849 if (rhs->type->is_error())
850 return rhs;
851
852 /* In the Tessellation Control Shader:
853 * If a per-vertex output variable is used as an l-value, it is an error
854 * if the expression indicating the vertex number is not the identifier
855 * `gl_InvocationID`.
856 */
857 if (state->stage == MESA_SHADER_TESS_CTRL && !lhs->type->is_error()) {
858 ir_variable *var = lhs->variable_referenced();
859 if (var && var->data.mode == ir_var_shader_out && !var->data.patch) {
860 ir_rvalue *index = find_innermost_array_index(lhs);
861 ir_variable *index_var = index ? index->variable_referenced() : NULL;
862 if (!index_var || strcmp(index_var->name, "gl_InvocationID") != 0) {
863 _mesa_glsl_error(&loc, state,
864 "Tessellation control shader outputs can only "
865 "be indexed by gl_InvocationID");
866 return NULL;
867 }
868 }
869 }
870
871 /* If the types are identical, the assignment can trivially proceed.
872 */
873 if (rhs->type == lhs->type)
874 return rhs;
875
876 /* If the array element types are the same and the LHS is unsized,
877 * the assignment is okay for initializers embedded in variable
878 * declarations.
879 *
880 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
881 * is handled by ir_dereference::is_lvalue.
882 */
883 const glsl_type *lhs_t = lhs->type;
884 const glsl_type *rhs_t = rhs->type;
885 bool unsized_array = false;
886 while(lhs_t->is_array()) {
887 if (rhs_t == lhs_t)
888 break; /* the rest of the inner arrays match so break out early */
889 if (!rhs_t->is_array()) {
890 unsized_array = false;
891 break; /* number of dimensions mismatch */
892 }
893 if (lhs_t->length == rhs_t->length) {
894 lhs_t = lhs_t->fields.array;
895 rhs_t = rhs_t->fields.array;
896 continue;
897 } else if (lhs_t->is_unsized_array()) {
898 unsized_array = true;
899 } else {
900 unsized_array = false;
901 break; /* sized array mismatch */
902 }
903 lhs_t = lhs_t->fields.array;
904 rhs_t = rhs_t->fields.array;
905 }
906 if (unsized_array) {
907 if (is_initializer) {
908 if (rhs->type->get_scalar_type() == lhs->type->get_scalar_type())
909 return rhs;
910 } else {
911 _mesa_glsl_error(&loc, state,
912 "implicitly sized arrays cannot be assigned");
913 return NULL;
914 }
915 }
916
917 /* Check for implicit conversion in GLSL 1.20 */
918 if (apply_implicit_conversion(lhs->type, rhs, state)) {
919 if (rhs->type == lhs->type)
920 return rhs;
921 }
922
923 _mesa_glsl_error(&loc, state,
924 "%s of type %s cannot be assigned to "
925 "variable of type %s",
926 is_initializer ? "initializer" : "value",
927 rhs->type->name, lhs->type->name);
928
929 return NULL;
930 }
931
932 static void
mark_whole_array_access(ir_rvalue * access)933 mark_whole_array_access(ir_rvalue *access)
934 {
935 ir_dereference_variable *deref = access->as_dereference_variable();
936
937 if (deref && deref->var) {
938 deref->var->data.max_array_access = deref->type->length - 1;
939 }
940 }
941
942 static bool
do_assignment(exec_list * instructions,struct _mesa_glsl_parse_state * state,const char * non_lvalue_description,ir_rvalue * lhs,ir_rvalue * rhs,ir_rvalue ** out_rvalue,bool needs_rvalue,bool is_initializer,YYLTYPE lhs_loc)943 do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
944 const char *non_lvalue_description,
945 ir_rvalue *lhs, ir_rvalue *rhs,
946 ir_rvalue **out_rvalue, bool needs_rvalue,
947 bool is_initializer,
948 YYLTYPE lhs_loc)
949 {
950 void *ctx = state;
951 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
952
953 ir_variable *lhs_var = lhs->variable_referenced();
954 if (lhs_var)
955 lhs_var->data.assigned = true;
956
957 if (!error_emitted) {
958 if (non_lvalue_description != NULL) {
959 _mesa_glsl_error(&lhs_loc, state,
960 "assignment to %s",
961 non_lvalue_description);
962 error_emitted = true;
963 } else if (lhs_var != NULL && (lhs_var->data.read_only ||
964 (lhs_var->data.mode == ir_var_shader_storage &&
965 lhs_var->data.memory_read_only))) {
966 /* We can have memory_read_only set on both images and buffer variables,
967 * but in the former there is a distinction between assignments to
968 * the variable itself (read_only) and to the memory they point to
969 * (memory_read_only), while in the case of buffer variables there is
970 * no such distinction, that is why this check here is limited to
971 * buffer variables alone.
972 */
973 _mesa_glsl_error(&lhs_loc, state,
974 "assignment to read-only variable '%s'",
975 lhs_var->name);
976 error_emitted = true;
977 } else if (lhs->type->is_array() &&
978 !state->check_version(120, 300, &lhs_loc,
979 "whole array assignment forbidden")) {
980 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
981 *
982 * "Other binary or unary expressions, non-dereferenced
983 * arrays, function names, swizzles with repeated fields,
984 * and constants cannot be l-values."
985 *
986 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
987 */
988 error_emitted = true;
989 } else if (!lhs->is_lvalue(state)) {
990 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
991 error_emitted = true;
992 }
993 }
994
995 ir_rvalue *new_rhs =
996 validate_assignment(state, lhs_loc, lhs, rhs, is_initializer);
997 if (new_rhs != NULL) {
998 rhs = new_rhs;
999
1000 /* If the LHS array was not declared with a size, it takes it size from
1001 * the RHS. If the LHS is an l-value and a whole array, it must be a
1002 * dereference of a variable. Any other case would require that the LHS
1003 * is either not an l-value or not a whole array.
1004 */
1005 if (lhs->type->is_unsized_array()) {
1006 ir_dereference *const d = lhs->as_dereference();
1007
1008 assert(d != NULL);
1009
1010 ir_variable *const var = d->variable_referenced();
1011
1012 assert(var != NULL);
1013
1014 if (var->data.max_array_access >= rhs->type->array_size()) {
1015 /* FINISHME: This should actually log the location of the RHS. */
1016 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
1017 "previous access",
1018 var->data.max_array_access);
1019 }
1020
1021 var->type = glsl_type::get_array_instance(lhs->type->fields.array,
1022 rhs->type->array_size());
1023 d->type = var->type;
1024 }
1025 if (lhs->type->is_array()) {
1026 mark_whole_array_access(rhs);
1027 mark_whole_array_access(lhs);
1028 }
1029 } else {
1030 error_emitted = true;
1031 }
1032
1033 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1034 * but not post_inc) need the converted assigned value as an rvalue
1035 * to handle things like:
1036 *
1037 * i = j += 1;
1038 */
1039 if (needs_rvalue) {
1040 ir_rvalue *rvalue;
1041 if (!error_emitted) {
1042 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
1043 ir_var_temporary);
1044 instructions->push_tail(var);
1045 instructions->push_tail(assign(var, rhs));
1046
1047 ir_dereference_variable *deref_var =
1048 new(ctx) ir_dereference_variable(var);
1049 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var));
1050 rvalue = new(ctx) ir_dereference_variable(var);
1051 } else {
1052 rvalue = ir_rvalue::error_value(ctx);
1053 }
1054 *out_rvalue = rvalue;
1055 } else {
1056 if (!error_emitted)
1057 instructions->push_tail(new(ctx) ir_assignment(lhs, rhs));
1058 *out_rvalue = NULL;
1059 }
1060
1061 return error_emitted;
1062 }
1063
1064 static ir_rvalue *
get_lvalue_copy(exec_list * instructions,ir_rvalue * lvalue)1065 get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
1066 {
1067 void *ctx = ralloc_parent(lvalue);
1068 ir_variable *var;
1069
1070 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
1071 ir_var_temporary);
1072 instructions->push_tail(var);
1073
1074 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
1075 lvalue));
1076
1077 return new(ctx) ir_dereference_variable(var);
1078 }
1079
1080
1081 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)1082 ast_node::hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
1083 {
1084 (void) instructions;
1085 (void) state;
1086
1087 return NULL;
1088 }
1089
1090 bool
has_sequence_subexpression() const1091 ast_node::has_sequence_subexpression() const
1092 {
1093 return false;
1094 }
1095
1096 void
set_is_lhs(bool)1097 ast_node::set_is_lhs(bool /* new_value */)
1098 {
1099 }
1100
1101 void
hir_no_rvalue(exec_list * instructions,struct _mesa_glsl_parse_state * state)1102 ast_function_expression::hir_no_rvalue(exec_list *instructions,
1103 struct _mesa_glsl_parse_state *state)
1104 {
1105 (void)hir(instructions, state);
1106 }
1107
1108 void
hir_no_rvalue(exec_list * instructions,struct _mesa_glsl_parse_state * state)1109 ast_aggregate_initializer::hir_no_rvalue(exec_list *instructions,
1110 struct _mesa_glsl_parse_state *state)
1111 {
1112 (void)hir(instructions, state);
1113 }
1114
1115 static ir_rvalue *
do_comparison(void * mem_ctx,int operation,ir_rvalue * op0,ir_rvalue * op1)1116 do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
1117 {
1118 int join_op;
1119 ir_rvalue *cmp = NULL;
1120
1121 if (operation == ir_binop_all_equal)
1122 join_op = ir_binop_logic_and;
1123 else
1124 join_op = ir_binop_logic_or;
1125
1126 switch (op0->type->base_type) {
1127 case GLSL_TYPE_FLOAT:
1128 case GLSL_TYPE_FLOAT16:
1129 case GLSL_TYPE_UINT:
1130 case GLSL_TYPE_INT:
1131 case GLSL_TYPE_BOOL:
1132 case GLSL_TYPE_DOUBLE:
1133 case GLSL_TYPE_UINT64:
1134 case GLSL_TYPE_INT64:
1135 case GLSL_TYPE_UINT16:
1136 case GLSL_TYPE_INT16:
1137 case GLSL_TYPE_UINT8:
1138 case GLSL_TYPE_INT8:
1139 return new(mem_ctx) ir_expression(operation, op0, op1);
1140
1141 case GLSL_TYPE_ARRAY: {
1142 for (unsigned int i = 0; i < op0->type->length; i++) {
1143 ir_rvalue *e0, *e1, *result;
1144
1145 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
1146 new(mem_ctx) ir_constant(i));
1147 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
1148 new(mem_ctx) ir_constant(i));
1149 result = do_comparison(mem_ctx, operation, e0, e1);
1150
1151 if (cmp) {
1152 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
1153 } else {
1154 cmp = result;
1155 }
1156 }
1157
1158 mark_whole_array_access(op0);
1159 mark_whole_array_access(op1);
1160 break;
1161 }
1162
1163 case GLSL_TYPE_STRUCT: {
1164 for (unsigned int i = 0; i < op0->type->length; i++) {
1165 ir_rvalue *e0, *e1, *result;
1166 const char *field_name = op0->type->fields.structure[i].name;
1167
1168 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
1169 field_name);
1170 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
1171 field_name);
1172 result = do_comparison(mem_ctx, operation, e0, e1);
1173
1174 if (cmp) {
1175 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
1176 } else {
1177 cmp = result;
1178 }
1179 }
1180 break;
1181 }
1182
1183 case GLSL_TYPE_ERROR:
1184 case GLSL_TYPE_VOID:
1185 case GLSL_TYPE_SAMPLER:
1186 case GLSL_TYPE_IMAGE:
1187 case GLSL_TYPE_INTERFACE:
1188 case GLSL_TYPE_ATOMIC_UINT:
1189 case GLSL_TYPE_SUBROUTINE:
1190 case GLSL_TYPE_FUNCTION:
1191 /* I assume a comparison of a struct containing a sampler just
1192 * ignores the sampler present in the type.
1193 */
1194 break;
1195 }
1196
1197 if (cmp == NULL)
1198 cmp = new(mem_ctx) ir_constant(true);
1199
1200 return cmp;
1201 }
1202
1203 /* For logical operations, we want to ensure that the operands are
1204 * scalar booleans. If it isn't, emit an error and return a constant
1205 * boolean to avoid triggering cascading error messages.
1206 */
1207 static ir_rvalue *
get_scalar_boolean_operand(exec_list * instructions,struct _mesa_glsl_parse_state * state,ast_expression * parent_expr,int operand,const char * operand_name,bool * error_emitted)1208 get_scalar_boolean_operand(exec_list *instructions,
1209 struct _mesa_glsl_parse_state *state,
1210 ast_expression *parent_expr,
1211 int operand,
1212 const char *operand_name,
1213 bool *error_emitted)
1214 {
1215 ast_expression *expr = parent_expr->subexpressions[operand];
1216 void *ctx = state;
1217 ir_rvalue *val = expr->hir(instructions, state);
1218
1219 if (val->type->is_boolean() && val->type->is_scalar())
1220 return val;
1221
1222 if (!*error_emitted) {
1223 YYLTYPE loc = expr->get_location();
1224 _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
1225 operand_name,
1226 parent_expr->operator_string(parent_expr->oper));
1227 *error_emitted = true;
1228 }
1229
1230 return new(ctx) ir_constant(true);
1231 }
1232
1233 /**
1234 * If name refers to a builtin array whose maximum allowed size is less than
1235 * size, report an error and return true. Otherwise return false.
1236 */
1237 void
check_builtin_array_max_size(const char * name,unsigned size,YYLTYPE loc,struct _mesa_glsl_parse_state * state)1238 check_builtin_array_max_size(const char *name, unsigned size,
1239 YYLTYPE loc, struct _mesa_glsl_parse_state *state)
1240 {
1241 if ((strcmp("gl_TexCoord", name) == 0)
1242 && (size > state->Const.MaxTextureCoords)) {
1243 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1244 *
1245 * "The size [of gl_TexCoord] can be at most
1246 * gl_MaxTextureCoords."
1247 */
1248 _mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
1249 "be larger than gl_MaxTextureCoords (%u)",
1250 state->Const.MaxTextureCoords);
1251 } else if (strcmp("gl_ClipDistance", name) == 0) {
1252 state->clip_dist_size = size;
1253 if (size + state->cull_dist_size > state->Const.MaxClipPlanes) {
1254 /* From section 7.1 (Vertex Shader Special Variables) of the
1255 * GLSL 1.30 spec:
1256 *
1257 * "The gl_ClipDistance array is predeclared as unsized and
1258 * must be sized by the shader either redeclaring it with a
1259 * size or indexing it only with integral constant
1260 * expressions. ... The size can be at most
1261 * gl_MaxClipDistances."
1262 */
1263 _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
1264 "be larger than gl_MaxClipDistances (%u)",
1265 state->Const.MaxClipPlanes);
1266 }
1267 } else if (strcmp("gl_CullDistance", name) == 0) {
1268 state->cull_dist_size = size;
1269 if (size + state->clip_dist_size > state->Const.MaxClipPlanes) {
1270 /* From the ARB_cull_distance spec:
1271 *
1272 * "The gl_CullDistance array is predeclared as unsized and
1273 * must be sized by the shader either redeclaring it with
1274 * a size or indexing it only with integral constant
1275 * expressions. The size determines the number and set of
1276 * enabled cull distances and can be at most
1277 * gl_MaxCullDistances."
1278 */
1279 _mesa_glsl_error(&loc, state, "`gl_CullDistance' array size cannot "
1280 "be larger than gl_MaxCullDistances (%u)",
1281 state->Const.MaxClipPlanes);
1282 }
1283 }
1284 }
1285
1286 /**
1287 * Create the constant 1, of a which is appropriate for incrementing and
1288 * decrementing values of the given GLSL type. For example, if type is vec4,
1289 * this creates a constant value of 1.0 having type float.
1290 *
1291 * If the given type is invalid for increment and decrement operators, return
1292 * a floating point 1--the error will be detected later.
1293 */
1294 static ir_rvalue *
constant_one_for_inc_dec(void * ctx,const glsl_type * type)1295 constant_one_for_inc_dec(void *ctx, const glsl_type *type)
1296 {
1297 switch (type->base_type) {
1298 case GLSL_TYPE_UINT:
1299 return new(ctx) ir_constant((unsigned) 1);
1300 case GLSL_TYPE_INT:
1301 return new(ctx) ir_constant(1);
1302 case GLSL_TYPE_UINT64:
1303 return new(ctx) ir_constant((uint64_t) 1);
1304 case GLSL_TYPE_INT64:
1305 return new(ctx) ir_constant((int64_t) 1);
1306 default:
1307 case GLSL_TYPE_FLOAT:
1308 return new(ctx) ir_constant(1.0f);
1309 }
1310 }
1311
1312 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)1313 ast_expression::hir(exec_list *instructions,
1314 struct _mesa_glsl_parse_state *state)
1315 {
1316 return do_hir(instructions, state, true);
1317 }
1318
1319 void
hir_no_rvalue(exec_list * instructions,struct _mesa_glsl_parse_state * state)1320 ast_expression::hir_no_rvalue(exec_list *instructions,
1321 struct _mesa_glsl_parse_state *state)
1322 {
1323 do_hir(instructions, state, false);
1324 }
1325
1326 void
set_is_lhs(bool new_value)1327 ast_expression::set_is_lhs(bool new_value)
1328 {
1329 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1330 * if we lack an identifier we can just skip it.
1331 */
1332 if (this->primary_expression.identifier == NULL)
1333 return;
1334
1335 this->is_lhs = new_value;
1336
1337 /* We need to go through the subexpressions tree to cover cases like
1338 * ast_field_selection
1339 */
1340 if (this->subexpressions[0] != NULL)
1341 this->subexpressions[0]->set_is_lhs(new_value);
1342 }
1343
1344 ir_rvalue *
do_hir(exec_list * instructions,struct _mesa_glsl_parse_state * state,bool needs_rvalue)1345 ast_expression::do_hir(exec_list *instructions,
1346 struct _mesa_glsl_parse_state *state,
1347 bool needs_rvalue)
1348 {
1349 void *ctx = state;
1350 static const int operations[AST_NUM_OPERATORS] = {
1351 -1, /* ast_assign doesn't convert to ir_expression. */
1352 -1, /* ast_plus doesn't convert to ir_expression. */
1353 ir_unop_neg,
1354 ir_binop_add,
1355 ir_binop_sub,
1356 ir_binop_mul,
1357 ir_binop_div,
1358 ir_binop_mod,
1359 ir_binop_lshift,
1360 ir_binop_rshift,
1361 ir_binop_less,
1362 ir_binop_less, /* This is correct. See the ast_greater case below. */
1363 ir_binop_gequal, /* This is correct. See the ast_lequal case below. */
1364 ir_binop_gequal,
1365 ir_binop_all_equal,
1366 ir_binop_any_nequal,
1367 ir_binop_bit_and,
1368 ir_binop_bit_xor,
1369 ir_binop_bit_or,
1370 ir_unop_bit_not,
1371 ir_binop_logic_and,
1372 ir_binop_logic_xor,
1373 ir_binop_logic_or,
1374 ir_unop_logic_not,
1375
1376 /* Note: The following block of expression types actually convert
1377 * to multiple IR instructions.
1378 */
1379 ir_binop_mul, /* ast_mul_assign */
1380 ir_binop_div, /* ast_div_assign */
1381 ir_binop_mod, /* ast_mod_assign */
1382 ir_binop_add, /* ast_add_assign */
1383 ir_binop_sub, /* ast_sub_assign */
1384 ir_binop_lshift, /* ast_ls_assign */
1385 ir_binop_rshift, /* ast_rs_assign */
1386 ir_binop_bit_and, /* ast_and_assign */
1387 ir_binop_bit_xor, /* ast_xor_assign */
1388 ir_binop_bit_or, /* ast_or_assign */
1389
1390 -1, /* ast_conditional doesn't convert to ir_expression. */
1391 ir_binop_add, /* ast_pre_inc. */
1392 ir_binop_sub, /* ast_pre_dec. */
1393 ir_binop_add, /* ast_post_inc. */
1394 ir_binop_sub, /* ast_post_dec. */
1395 -1, /* ast_field_selection doesn't conv to ir_expression. */
1396 -1, /* ast_array_index doesn't convert to ir_expression. */
1397 -1, /* ast_function_call doesn't conv to ir_expression. */
1398 -1, /* ast_identifier doesn't convert to ir_expression. */
1399 -1, /* ast_int_constant doesn't convert to ir_expression. */
1400 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1401 -1, /* ast_float_constant doesn't conv to ir_expression. */
1402 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1403 -1, /* ast_sequence doesn't convert to ir_expression. */
1404 -1, /* ast_aggregate shouldn't ever even get here. */
1405 };
1406 ir_rvalue *result = NULL;
1407 ir_rvalue *op[3];
1408 const struct glsl_type *type, *orig_type;
1409 bool error_emitted = false;
1410 YYLTYPE loc;
1411
1412 loc = this->get_location();
1413
1414 switch (this->oper) {
1415 case ast_aggregate:
1416 unreachable("ast_aggregate: Should never get here.");
1417
1418 case ast_assign: {
1419 this->subexpressions[0]->set_is_lhs(true);
1420 op[0] = this->subexpressions[0]->hir(instructions, state);
1421 op[1] = this->subexpressions[1]->hir(instructions, state);
1422
1423 error_emitted =
1424 do_assignment(instructions, state,
1425 this->subexpressions[0]->non_lvalue_description,
1426 op[0], op[1], &result, needs_rvalue, false,
1427 this->subexpressions[0]->get_location());
1428 break;
1429 }
1430
1431 case ast_plus:
1432 op[0] = this->subexpressions[0]->hir(instructions, state);
1433
1434 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
1435
1436 error_emitted = type->is_error();
1437
1438 result = op[0];
1439 break;
1440
1441 case ast_neg:
1442 op[0] = this->subexpressions[0]->hir(instructions, state);
1443
1444 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
1445
1446 error_emitted = type->is_error();
1447
1448 result = new(ctx) ir_expression(operations[this->oper], type,
1449 op[0], NULL);
1450 break;
1451
1452 case ast_add:
1453 case ast_sub:
1454 case ast_mul:
1455 case ast_div:
1456 op[0] = this->subexpressions[0]->hir(instructions, state);
1457 op[1] = this->subexpressions[1]->hir(instructions, state);
1458
1459 type = arithmetic_result_type(op[0], op[1],
1460 (this->oper == ast_mul),
1461 state, & loc);
1462 error_emitted = type->is_error();
1463
1464 result = new(ctx) ir_expression(operations[this->oper], type,
1465 op[0], op[1]);
1466 break;
1467
1468 case ast_mod:
1469 op[0] = this->subexpressions[0]->hir(instructions, state);
1470 op[1] = this->subexpressions[1]->hir(instructions, state);
1471
1472 type = modulus_result_type(op[0], op[1], state, &loc);
1473
1474 assert(operations[this->oper] == ir_binop_mod);
1475
1476 result = new(ctx) ir_expression(operations[this->oper], type,
1477 op[0], op[1]);
1478 error_emitted = type->is_error();
1479 break;
1480
1481 case ast_lshift:
1482 case ast_rshift:
1483 if (!state->check_bitwise_operations_allowed(&loc)) {
1484 error_emitted = true;
1485 }
1486
1487 op[0] = this->subexpressions[0]->hir(instructions, state);
1488 op[1] = this->subexpressions[1]->hir(instructions, state);
1489 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1490 &loc);
1491 result = new(ctx) ir_expression(operations[this->oper], type,
1492 op[0], op[1]);
1493 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1494 break;
1495
1496 case ast_less:
1497 case ast_greater:
1498 case ast_lequal:
1499 case ast_gequal:
1500 op[0] = this->subexpressions[0]->hir(instructions, state);
1501 op[1] = this->subexpressions[1]->hir(instructions, state);
1502
1503 type = relational_result_type(op[0], op[1], state, & loc);
1504
1505 /* The relational operators must either generate an error or result
1506 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1507 */
1508 assert(type->is_error()
1509 || (type->is_boolean() && type->is_scalar()));
1510
1511 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap
1512 * the arguments and use < or >=.
1513 */
1514 if (this->oper == ast_greater || this->oper == ast_lequal) {
1515 ir_rvalue *const tmp = op[0];
1516 op[0] = op[1];
1517 op[1] = tmp;
1518 }
1519
1520 result = new(ctx) ir_expression(operations[this->oper], type,
1521 op[0], op[1]);
1522 error_emitted = type->is_error();
1523 break;
1524
1525 case ast_nequal:
1526 case ast_equal:
1527 op[0] = this->subexpressions[0]->hir(instructions, state);
1528 op[1] = this->subexpressions[1]->hir(instructions, state);
1529
1530 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1531 *
1532 * "The equality operators equal (==), and not equal (!=)
1533 * operate on all types. They result in a scalar Boolean. If
1534 * the operand types do not match, then there must be a
1535 * conversion from Section 4.1.10 "Implicit Conversions"
1536 * applied to one operand that can make them match, in which
1537 * case this conversion is done."
1538 */
1539
1540 if (op[0]->type == glsl_type::void_type || op[1]->type == glsl_type::void_type) {
1541 _mesa_glsl_error(& loc, state, "`%s': wrong operand types: "
1542 "no operation `%1$s' exists that takes a left-hand "
1543 "operand of type 'void' or a right operand of type "
1544 "'void'", (this->oper == ast_equal) ? "==" : "!=");
1545 error_emitted = true;
1546 } else if ((!apply_implicit_conversion(op[0]->type, op[1], state)
1547 && !apply_implicit_conversion(op[1]->type, op[0], state))
1548 || (op[0]->type != op[1]->type)) {
1549 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
1550 "type", (this->oper == ast_equal) ? "==" : "!=");
1551 error_emitted = true;
1552 } else if ((op[0]->type->is_array() || op[1]->type->is_array()) &&
1553 !state->check_version(120, 300, &loc,
1554 "array comparisons forbidden")) {
1555 error_emitted = true;
1556 } else if ((op[0]->type->contains_subroutine() ||
1557 op[1]->type->contains_subroutine())) {
1558 _mesa_glsl_error(&loc, state, "subroutine comparisons forbidden");
1559 error_emitted = true;
1560 } else if ((op[0]->type->contains_opaque() ||
1561 op[1]->type->contains_opaque())) {
1562 _mesa_glsl_error(&loc, state, "opaque type comparisons forbidden");
1563 error_emitted = true;
1564 }
1565
1566 if (error_emitted) {
1567 result = new(ctx) ir_constant(false);
1568 } else {
1569 result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
1570 assert(result->type == glsl_type::bool_type);
1571 }
1572 break;
1573
1574 case ast_bit_and:
1575 case ast_bit_xor:
1576 case ast_bit_or:
1577 op[0] = this->subexpressions[0]->hir(instructions, state);
1578 op[1] = this->subexpressions[1]->hir(instructions, state);
1579 type = bit_logic_result_type(op[0], op[1], this->oper, state, &loc);
1580 result = new(ctx) ir_expression(operations[this->oper], type,
1581 op[0], op[1]);
1582 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1583 break;
1584
1585 case ast_bit_not:
1586 op[0] = this->subexpressions[0]->hir(instructions, state);
1587
1588 if (!state->check_bitwise_operations_allowed(&loc)) {
1589 error_emitted = true;
1590 }
1591
1592 if (!op[0]->type->is_integer_32_64()) {
1593 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
1594 error_emitted = true;
1595 }
1596
1597 type = error_emitted ? glsl_type::error_type : op[0]->type;
1598 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
1599 break;
1600
1601 case ast_logic_and: {
1602 exec_list rhs_instructions;
1603 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1604 "LHS", &error_emitted);
1605 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
1606 "RHS", &error_emitted);
1607
1608 if (rhs_instructions.is_empty()) {
1609 result = new(ctx) ir_expression(ir_binop_logic_and, op[0], op[1]);
1610 } else {
1611 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1612 "and_tmp",
1613 ir_var_temporary);
1614 instructions->push_tail(tmp);
1615
1616 ir_if *const stmt = new(ctx) ir_if(op[0]);
1617 instructions->push_tail(stmt);
1618
1619 stmt->then_instructions.append_list(&rhs_instructions);
1620 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1621 ir_assignment *const then_assign =
1622 new(ctx) ir_assignment(then_deref, op[1]);
1623 stmt->then_instructions.push_tail(then_assign);
1624
1625 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1626 ir_assignment *const else_assign =
1627 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false));
1628 stmt->else_instructions.push_tail(else_assign);
1629
1630 result = new(ctx) ir_dereference_variable(tmp);
1631 }
1632 break;
1633 }
1634
1635 case ast_logic_or: {
1636 exec_list rhs_instructions;
1637 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1638 "LHS", &error_emitted);
1639 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
1640 "RHS", &error_emitted);
1641
1642 if (rhs_instructions.is_empty()) {
1643 result = new(ctx) ir_expression(ir_binop_logic_or, op[0], op[1]);
1644 } else {
1645 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1646 "or_tmp",
1647 ir_var_temporary);
1648 instructions->push_tail(tmp);
1649
1650 ir_if *const stmt = new(ctx) ir_if(op[0]);
1651 instructions->push_tail(stmt);
1652
1653 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1654 ir_assignment *const then_assign =
1655 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true));
1656 stmt->then_instructions.push_tail(then_assign);
1657
1658 stmt->else_instructions.append_list(&rhs_instructions);
1659 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1660 ir_assignment *const else_assign =
1661 new(ctx) ir_assignment(else_deref, op[1]);
1662 stmt->else_instructions.push_tail(else_assign);
1663
1664 result = new(ctx) ir_dereference_variable(tmp);
1665 }
1666 break;
1667 }
1668
1669 case ast_logic_xor:
1670 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1671 *
1672 * "The logical binary operators and (&&), or ( | | ), and
1673 * exclusive or (^^). They operate only on two Boolean
1674 * expressions and result in a Boolean expression."
1675 */
1676 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS",
1677 &error_emitted);
1678 op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS",
1679 &error_emitted);
1680
1681 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1682 op[0], op[1]);
1683 break;
1684
1685 case ast_logic_not:
1686 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1687 "operand", &error_emitted);
1688
1689 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1690 op[0], NULL);
1691 break;
1692
1693 case ast_mul_assign:
1694 case ast_div_assign:
1695 case ast_add_assign:
1696 case ast_sub_assign: {
1697 this->subexpressions[0]->set_is_lhs(true);
1698 op[0] = this->subexpressions[0]->hir(instructions, state);
1699 op[1] = this->subexpressions[1]->hir(instructions, state);
1700
1701 orig_type = op[0]->type;
1702
1703 /* Break out if operand types were not parsed successfully. */
1704 if ((op[0]->type == glsl_type::error_type ||
1705 op[1]->type == glsl_type::error_type))
1706 break;
1707
1708 type = arithmetic_result_type(op[0], op[1],
1709 (this->oper == ast_mul_assign),
1710 state, & loc);
1711
1712 if (type != orig_type) {
1713 _mesa_glsl_error(& loc, state,
1714 "could not implicitly convert "
1715 "%s to %s", type->name, orig_type->name);
1716 type = glsl_type::error_type;
1717 }
1718
1719 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1720 op[0], op[1]);
1721
1722 error_emitted =
1723 do_assignment(instructions, state,
1724 this->subexpressions[0]->non_lvalue_description,
1725 op[0]->clone(ctx, NULL), temp_rhs,
1726 &result, needs_rvalue, false,
1727 this->subexpressions[0]->get_location());
1728
1729 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1730 * explicitly test for this because none of the binary expression
1731 * operators allow array operands either.
1732 */
1733
1734 break;
1735 }
1736
1737 case ast_mod_assign: {
1738 this->subexpressions[0]->set_is_lhs(true);
1739 op[0] = this->subexpressions[0]->hir(instructions, state);
1740 op[1] = this->subexpressions[1]->hir(instructions, state);
1741
1742 orig_type = op[0]->type;
1743 type = modulus_result_type(op[0], op[1], state, &loc);
1744
1745 if (type != orig_type) {
1746 _mesa_glsl_error(& loc, state,
1747 "could not implicitly convert "
1748 "%s to %s", type->name, orig_type->name);
1749 type = glsl_type::error_type;
1750 }
1751
1752 assert(operations[this->oper] == ir_binop_mod);
1753
1754 ir_rvalue *temp_rhs;
1755 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1756 op[0], op[1]);
1757
1758 error_emitted =
1759 do_assignment(instructions, state,
1760 this->subexpressions[0]->non_lvalue_description,
1761 op[0]->clone(ctx, NULL), temp_rhs,
1762 &result, needs_rvalue, false,
1763 this->subexpressions[0]->get_location());
1764 break;
1765 }
1766
1767 case ast_ls_assign:
1768 case ast_rs_assign: {
1769 this->subexpressions[0]->set_is_lhs(true);
1770 op[0] = this->subexpressions[0]->hir(instructions, state);
1771 op[1] = this->subexpressions[1]->hir(instructions, state);
1772 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1773 &loc);
1774 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1775 type, op[0], op[1]);
1776 error_emitted =
1777 do_assignment(instructions, state,
1778 this->subexpressions[0]->non_lvalue_description,
1779 op[0]->clone(ctx, NULL), temp_rhs,
1780 &result, needs_rvalue, false,
1781 this->subexpressions[0]->get_location());
1782 break;
1783 }
1784
1785 case ast_and_assign:
1786 case ast_xor_assign:
1787 case ast_or_assign: {
1788 this->subexpressions[0]->set_is_lhs(true);
1789 op[0] = this->subexpressions[0]->hir(instructions, state);
1790 op[1] = this->subexpressions[1]->hir(instructions, state);
1791
1792 orig_type = op[0]->type;
1793 type = bit_logic_result_type(op[0], op[1], this->oper, state, &loc);
1794
1795 if (type != orig_type) {
1796 _mesa_glsl_error(& loc, state,
1797 "could not implicitly convert "
1798 "%s to %s", type->name, orig_type->name);
1799 type = glsl_type::error_type;
1800 }
1801
1802 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1803 type, op[0], op[1]);
1804 error_emitted =
1805 do_assignment(instructions, state,
1806 this->subexpressions[0]->non_lvalue_description,
1807 op[0]->clone(ctx, NULL), temp_rhs,
1808 &result, needs_rvalue, false,
1809 this->subexpressions[0]->get_location());
1810 break;
1811 }
1812
1813 case ast_conditional: {
1814 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1815 *
1816 * "The ternary selection operator (?:). It operates on three
1817 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1818 * first expression, which must result in a scalar Boolean."
1819 */
1820 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1821 "condition", &error_emitted);
1822
1823 /* The :? operator is implemented by generating an anonymous temporary
1824 * followed by an if-statement. The last instruction in each branch of
1825 * the if-statement assigns a value to the anonymous temporary. This
1826 * temporary is the r-value of the expression.
1827 */
1828 exec_list then_instructions;
1829 exec_list else_instructions;
1830
1831 op[1] = this->subexpressions[1]->hir(&then_instructions, state);
1832 op[2] = this->subexpressions[2]->hir(&else_instructions, state);
1833
1834 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1835 *
1836 * "The second and third expressions can be any type, as
1837 * long their types match, or there is a conversion in
1838 * Section 4.1.10 "Implicit Conversions" that can be applied
1839 * to one of the expressions to make their types match. This
1840 * resulting matching type is the type of the entire
1841 * expression."
1842 */
1843 if ((!apply_implicit_conversion(op[1]->type, op[2], state)
1844 && !apply_implicit_conversion(op[2]->type, op[1], state))
1845 || (op[1]->type != op[2]->type)) {
1846 YYLTYPE loc = this->subexpressions[1]->get_location();
1847
1848 _mesa_glsl_error(& loc, state, "second and third operands of ?: "
1849 "operator must have matching types");
1850 error_emitted = true;
1851 type = glsl_type::error_type;
1852 } else {
1853 type = op[1]->type;
1854 }
1855
1856 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1857 *
1858 * "The second and third expressions must be the same type, but can
1859 * be of any type other than an array."
1860 */
1861 if (type->is_array() &&
1862 !state->check_version(120, 300, &loc,
1863 "second and third operands of ?: operator "
1864 "cannot be arrays")) {
1865 error_emitted = true;
1866 }
1867
1868 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1869 *
1870 * "Except for array indexing, structure member selection, and
1871 * parentheses, opaque variables are not allowed to be operands in
1872 * expressions; such use results in a compile-time error."
1873 */
1874 if (type->contains_opaque()) {
1875 if (!(state->has_bindless() && (type->is_image() || type->is_sampler()))) {
1876 _mesa_glsl_error(&loc, state, "variables of type %s cannot be "
1877 "operands of the ?: operator", type->name);
1878 error_emitted = true;
1879 }
1880 }
1881
1882 ir_constant *cond_val = op[0]->constant_expression_value(ctx);
1883
1884 if (then_instructions.is_empty()
1885 && else_instructions.is_empty()
1886 && cond_val != NULL) {
1887 result = cond_val->value.b[0] ? op[1] : op[2];
1888 } else {
1889 /* The copy to conditional_tmp reads the whole array. */
1890 if (type->is_array()) {
1891 mark_whole_array_access(op[1]);
1892 mark_whole_array_access(op[2]);
1893 }
1894
1895 ir_variable *const tmp =
1896 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
1897 instructions->push_tail(tmp);
1898
1899 ir_if *const stmt = new(ctx) ir_if(op[0]);
1900 instructions->push_tail(stmt);
1901
1902 then_instructions.move_nodes_to(& stmt->then_instructions);
1903 ir_dereference *const then_deref =
1904 new(ctx) ir_dereference_variable(tmp);
1905 ir_assignment *const then_assign =
1906 new(ctx) ir_assignment(then_deref, op[1]);
1907 stmt->then_instructions.push_tail(then_assign);
1908
1909 else_instructions.move_nodes_to(& stmt->else_instructions);
1910 ir_dereference *const else_deref =
1911 new(ctx) ir_dereference_variable(tmp);
1912 ir_assignment *const else_assign =
1913 new(ctx) ir_assignment(else_deref, op[2]);
1914 stmt->else_instructions.push_tail(else_assign);
1915
1916 result = new(ctx) ir_dereference_variable(tmp);
1917 }
1918 break;
1919 }
1920
1921 case ast_pre_inc:
1922 case ast_pre_dec: {
1923 this->non_lvalue_description = (this->oper == ast_pre_inc)
1924 ? "pre-increment operation" : "pre-decrement operation";
1925
1926 op[0] = this->subexpressions[0]->hir(instructions, state);
1927 op[1] = constant_one_for_inc_dec(ctx, op[0]->type);
1928
1929 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1930
1931 ir_rvalue *temp_rhs;
1932 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1933 op[0], op[1]);
1934
1935 error_emitted =
1936 do_assignment(instructions, state,
1937 this->subexpressions[0]->non_lvalue_description,
1938 op[0]->clone(ctx, NULL), temp_rhs,
1939 &result, needs_rvalue, false,
1940 this->subexpressions[0]->get_location());
1941 break;
1942 }
1943
1944 case ast_post_inc:
1945 case ast_post_dec: {
1946 this->non_lvalue_description = (this->oper == ast_post_inc)
1947 ? "post-increment operation" : "post-decrement operation";
1948 op[0] = this->subexpressions[0]->hir(instructions, state);
1949 op[1] = constant_one_for_inc_dec(ctx, op[0]->type);
1950
1951 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1952
1953 if (error_emitted) {
1954 result = ir_rvalue::error_value(ctx);
1955 break;
1956 }
1957
1958 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1959
1960 ir_rvalue *temp_rhs;
1961 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1962 op[0], op[1]);
1963
1964 /* Get a temporary of a copy of the lvalue before it's modified.
1965 * This may get thrown away later.
1966 */
1967 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
1968
1969 ir_rvalue *junk_rvalue;
1970 error_emitted =
1971 do_assignment(instructions, state,
1972 this->subexpressions[0]->non_lvalue_description,
1973 op[0]->clone(ctx, NULL), temp_rhs,
1974 &junk_rvalue, false, false,
1975 this->subexpressions[0]->get_location());
1976
1977 break;
1978 }
1979
1980 case ast_field_selection:
1981 result = _mesa_ast_field_selection_to_hir(this, instructions, state);
1982 break;
1983
1984 case ast_array_index: {
1985 YYLTYPE index_loc = subexpressions[1]->get_location();
1986
1987 /* Getting if an array is being used uninitialized is beyond what we get
1988 * from ir_value.data.assigned. Setting is_lhs as true would force to
1989 * not raise a uninitialized warning when using an array
1990 */
1991 subexpressions[0]->set_is_lhs(true);
1992 op[0] = subexpressions[0]->hir(instructions, state);
1993 op[1] = subexpressions[1]->hir(instructions, state);
1994
1995 result = _mesa_ast_array_index_to_hir(ctx, state, op[0], op[1],
1996 loc, index_loc);
1997
1998 if (result->type->is_error())
1999 error_emitted = true;
2000
2001 break;
2002 }
2003
2004 case ast_unsized_array_dim:
2005 unreachable("ast_unsized_array_dim: Should never get here.");
2006
2007 case ast_function_call:
2008 /* Should *NEVER* get here. ast_function_call should always be handled
2009 * by ast_function_expression::hir.
2010 */
2011 unreachable("ast_function_call: handled elsewhere ");
2012
2013 case ast_identifier: {
2014 /* ast_identifier can appear several places in a full abstract syntax
2015 * tree. This particular use must be at location specified in the grammar
2016 * as 'variable_identifier'.
2017 */
2018 ir_variable *var =
2019 state->symbols->get_variable(this->primary_expression.identifier);
2020
2021 if (var == NULL) {
2022 /* the identifier might be a subroutine name */
2023 char *sub_name;
2024 sub_name = ralloc_asprintf(ctx, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state->stage), this->primary_expression.identifier);
2025 var = state->symbols->get_variable(sub_name);
2026 ralloc_free(sub_name);
2027 }
2028
2029 if (var != NULL) {
2030 var->data.used = true;
2031 result = new(ctx) ir_dereference_variable(var);
2032
2033 if ((var->data.mode == ir_var_auto || var->data.mode == ir_var_shader_out)
2034 && !this->is_lhs
2035 && result->variable_referenced()->data.assigned != true
2036 && !is_gl_identifier(var->name)) {
2037 _mesa_glsl_warning(&loc, state, "`%s' used uninitialized",
2038 this->primary_expression.identifier);
2039 }
2040
2041 /* From the EXT_shader_framebuffer_fetch spec:
2042 *
2043 * "Unless the GL_EXT_shader_framebuffer_fetch extension has been
2044 * enabled in addition, it's an error to use gl_LastFragData if it
2045 * hasn't been explicitly redeclared with layout(noncoherent)."
2046 */
2047 if (var->data.fb_fetch_output && var->data.memory_coherent &&
2048 !state->EXT_shader_framebuffer_fetch_enable) {
2049 _mesa_glsl_error(&loc, state,
2050 "invalid use of framebuffer fetch output not "
2051 "qualified with layout(noncoherent)");
2052 }
2053
2054 } else {
2055 _mesa_glsl_error(& loc, state, "`%s' undeclared",
2056 this->primary_expression.identifier);
2057
2058 result = ir_rvalue::error_value(ctx);
2059 error_emitted = true;
2060 }
2061 break;
2062 }
2063
2064 case ast_int_constant:
2065 result = new(ctx) ir_constant(this->primary_expression.int_constant);
2066 break;
2067
2068 case ast_uint_constant:
2069 result = new(ctx) ir_constant(this->primary_expression.uint_constant);
2070 break;
2071
2072 case ast_float_constant:
2073 result = new(ctx) ir_constant(this->primary_expression.float_constant);
2074 break;
2075
2076 case ast_bool_constant:
2077 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
2078 break;
2079
2080 case ast_double_constant:
2081 result = new(ctx) ir_constant(this->primary_expression.double_constant);
2082 break;
2083
2084 case ast_uint64_constant:
2085 result = new(ctx) ir_constant(this->primary_expression.uint64_constant);
2086 break;
2087
2088 case ast_int64_constant:
2089 result = new(ctx) ir_constant(this->primary_expression.int64_constant);
2090 break;
2091
2092 case ast_sequence: {
2093 /* It should not be possible to generate a sequence in the AST without
2094 * any expressions in it.
2095 */
2096 assert(!this->expressions.is_empty());
2097
2098 /* The r-value of a sequence is the last expression in the sequence. If
2099 * the other expressions in the sequence do not have side-effects (and
2100 * therefore add instructions to the instruction list), they get dropped
2101 * on the floor.
2102 */
2103 exec_node *previous_tail = NULL;
2104 YYLTYPE previous_operand_loc = loc;
2105
2106 foreach_list_typed (ast_node, ast, link, &this->expressions) {
2107 /* If one of the operands of comma operator does not generate any
2108 * code, we want to emit a warning. At each pass through the loop
2109 * previous_tail will point to the last instruction in the stream
2110 * *before* processing the previous operand. Naturally,
2111 * instructions->get_tail_raw() will point to the last instruction in
2112 * the stream *after* processing the previous operand. If the two
2113 * pointers match, then the previous operand had no effect.
2114 *
2115 * The warning behavior here differs slightly from GCC. GCC will
2116 * only emit a warning if none of the left-hand operands have an
2117 * effect. However, it will emit a warning for each. I believe that
2118 * there are some cases in C (especially with GCC extensions) where
2119 * it is useful to have an intermediate step in a sequence have no
2120 * effect, but I don't think these cases exist in GLSL. Either way,
2121 * it would be a giant hassle to replicate that behavior.
2122 */
2123 if (previous_tail == instructions->get_tail_raw()) {
2124 _mesa_glsl_warning(&previous_operand_loc, state,
2125 "left-hand operand of comma expression has "
2126 "no effect");
2127 }
2128
2129 /* The tail is directly accessed instead of using the get_tail()
2130 * method for performance reasons. get_tail() has extra code to
2131 * return NULL when the list is empty. We don't care about that
2132 * here, so using get_tail_raw() is fine.
2133 */
2134 previous_tail = instructions->get_tail_raw();
2135 previous_operand_loc = ast->get_location();
2136
2137 result = ast->hir(instructions, state);
2138 }
2139
2140 /* Any errors should have already been emitted in the loop above.
2141 */
2142 error_emitted = true;
2143 break;
2144 }
2145 }
2146 type = NULL; /* use result->type, not type. */
2147 assert(result != NULL || !needs_rvalue);
2148
2149 if (result && result->type->is_error() && !error_emitted)
2150 _mesa_glsl_error(& loc, state, "type mismatch");
2151
2152 return result;
2153 }
2154
2155 bool
has_sequence_subexpression() const2156 ast_expression::has_sequence_subexpression() const
2157 {
2158 switch (this->oper) {
2159 case ast_plus:
2160 case ast_neg:
2161 case ast_bit_not:
2162 case ast_logic_not:
2163 case ast_pre_inc:
2164 case ast_pre_dec:
2165 case ast_post_inc:
2166 case ast_post_dec:
2167 return this->subexpressions[0]->has_sequence_subexpression();
2168
2169 case ast_assign:
2170 case ast_add:
2171 case ast_sub:
2172 case ast_mul:
2173 case ast_div:
2174 case ast_mod:
2175 case ast_lshift:
2176 case ast_rshift:
2177 case ast_less:
2178 case ast_greater:
2179 case ast_lequal:
2180 case ast_gequal:
2181 case ast_nequal:
2182 case ast_equal:
2183 case ast_bit_and:
2184 case ast_bit_xor:
2185 case ast_bit_or:
2186 case ast_logic_and:
2187 case ast_logic_or:
2188 case ast_logic_xor:
2189 case ast_array_index:
2190 case ast_mul_assign:
2191 case ast_div_assign:
2192 case ast_add_assign:
2193 case ast_sub_assign:
2194 case ast_mod_assign:
2195 case ast_ls_assign:
2196 case ast_rs_assign:
2197 case ast_and_assign:
2198 case ast_xor_assign:
2199 case ast_or_assign:
2200 return this->subexpressions[0]->has_sequence_subexpression() ||
2201 this->subexpressions[1]->has_sequence_subexpression();
2202
2203 case ast_conditional:
2204 return this->subexpressions[0]->has_sequence_subexpression() ||
2205 this->subexpressions[1]->has_sequence_subexpression() ||
2206 this->subexpressions[2]->has_sequence_subexpression();
2207
2208 case ast_sequence:
2209 return true;
2210
2211 case ast_field_selection:
2212 case ast_identifier:
2213 case ast_int_constant:
2214 case ast_uint_constant:
2215 case ast_float_constant:
2216 case ast_bool_constant:
2217 case ast_double_constant:
2218 case ast_int64_constant:
2219 case ast_uint64_constant:
2220 return false;
2221
2222 case ast_aggregate:
2223 return false;
2224
2225 case ast_function_call:
2226 unreachable("should be handled by ast_function_expression::hir");
2227
2228 case ast_unsized_array_dim:
2229 unreachable("ast_unsized_array_dim: Should never get here.");
2230 }
2231
2232 return false;
2233 }
2234
2235 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)2236 ast_expression_statement::hir(exec_list *instructions,
2237 struct _mesa_glsl_parse_state *state)
2238 {
2239 /* It is possible to have expression statements that don't have an
2240 * expression. This is the solitary semicolon:
2241 *
2242 * for (i = 0; i < 5; i++)
2243 * ;
2244 *
2245 * In this case the expression will be NULL. Test for NULL and don't do
2246 * anything in that case.
2247 */
2248 if (expression != NULL)
2249 expression->hir_no_rvalue(instructions, state);
2250
2251 /* Statements do not have r-values.
2252 */
2253 return NULL;
2254 }
2255
2256
2257 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)2258 ast_compound_statement::hir(exec_list *instructions,
2259 struct _mesa_glsl_parse_state *state)
2260 {
2261 if (new_scope)
2262 state->symbols->push_scope();
2263
2264 foreach_list_typed (ast_node, ast, link, &this->statements)
2265 ast->hir(instructions, state);
2266
2267 if (new_scope)
2268 state->symbols->pop_scope();
2269
2270 /* Compound statements do not have r-values.
2271 */
2272 return NULL;
2273 }
2274
2275 /**
2276 * Evaluate the given exec_node (which should be an ast_node representing
2277 * a single array dimension) and return its integer value.
2278 */
2279 static unsigned
process_array_size(exec_node * node,struct _mesa_glsl_parse_state * state)2280 process_array_size(exec_node *node,
2281 struct _mesa_glsl_parse_state *state)
2282 {
2283 void *mem_ctx = state;
2284
2285 exec_list dummy_instructions;
2286
2287 ast_node *array_size = exec_node_data(ast_node, node, link);
2288
2289 /**
2290 * Dimensions other than the outermost dimension can by unsized if they
2291 * are immediately sized by a constructor or initializer.
2292 */
2293 if (((ast_expression*)array_size)->oper == ast_unsized_array_dim)
2294 return 0;
2295
2296 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
2297 YYLTYPE loc = array_size->get_location();
2298
2299 if (ir == NULL) {
2300 _mesa_glsl_error(& loc, state,
2301 "array size could not be resolved");
2302 return 0;
2303 }
2304
2305 if (!ir->type->is_integer_32()) {
2306 _mesa_glsl_error(& loc, state,
2307 "array size must be integer type");
2308 return 0;
2309 }
2310
2311 if (!ir->type->is_scalar()) {
2312 _mesa_glsl_error(& loc, state,
2313 "array size must be scalar type");
2314 return 0;
2315 }
2316
2317 ir_constant *const size = ir->constant_expression_value(mem_ctx);
2318 if (size == NULL ||
2319 (state->is_version(120, 300) &&
2320 array_size->has_sequence_subexpression())) {
2321 _mesa_glsl_error(& loc, state, "array size must be a "
2322 "constant valued expression");
2323 return 0;
2324 }
2325
2326 if (size->value.i[0] <= 0) {
2327 _mesa_glsl_error(& loc, state, "array size must be > 0");
2328 return 0;
2329 }
2330
2331 assert(size->type == ir->type);
2332
2333 /* If the array size is const (and we've verified that
2334 * it is) then no instructions should have been emitted
2335 * when we converted it to HIR. If they were emitted,
2336 * then either the array size isn't const after all, or
2337 * we are emitting unnecessary instructions.
2338 */
2339 assert(dummy_instructions.is_empty());
2340
2341 return size->value.u[0];
2342 }
2343
2344 static const glsl_type *
process_array_type(YYLTYPE * loc,const glsl_type * base,ast_array_specifier * array_specifier,struct _mesa_glsl_parse_state * state)2345 process_array_type(YYLTYPE *loc, const glsl_type *base,
2346 ast_array_specifier *array_specifier,
2347 struct _mesa_glsl_parse_state *state)
2348 {
2349 const glsl_type *array_type = base;
2350
2351 if (array_specifier != NULL) {
2352 if (base->is_array()) {
2353
2354 /* From page 19 (page 25) of the GLSL 1.20 spec:
2355 *
2356 * "Only one-dimensional arrays may be declared."
2357 */
2358 if (!state->check_arrays_of_arrays_allowed(loc)) {
2359 return glsl_type::error_type;
2360 }
2361 }
2362
2363 for (exec_node *node = array_specifier->array_dimensions.get_tail_raw();
2364 !node->is_head_sentinel(); node = node->prev) {
2365 unsigned array_size = process_array_size(node, state);
2366 array_type = glsl_type::get_array_instance(array_type, array_size);
2367 }
2368 }
2369
2370 return array_type;
2371 }
2372
2373 static bool
precision_qualifier_allowed(const glsl_type * type)2374 precision_qualifier_allowed(const glsl_type *type)
2375 {
2376 /* Precision qualifiers apply to floating point, integer and opaque
2377 * types.
2378 *
2379 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2380 * "Any floating point or any integer declaration can have the type
2381 * preceded by one of these precision qualifiers [...] Literal
2382 * constants do not have precision qualifiers. Neither do Boolean
2383 * variables.
2384 *
2385 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2386 * spec also says:
2387 *
2388 * "Precision qualifiers are added for code portability with OpenGL
2389 * ES, not for functionality. They have the same syntax as in OpenGL
2390 * ES."
2391 *
2392 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2393 *
2394 * "uniform lowp sampler2D sampler;
2395 * highp vec2 coord;
2396 * ...
2397 * lowp vec4 col = texture2D (sampler, coord);
2398 * // texture2D returns lowp"
2399 *
2400 * From this, we infer that GLSL 1.30 (and later) should allow precision
2401 * qualifiers on sampler types just like float and integer types.
2402 */
2403 const glsl_type *const t = type->without_array();
2404
2405 return (t->is_float() || t->is_integer_32() || t->contains_opaque()) &&
2406 !t->is_struct();
2407 }
2408
2409 const glsl_type *
glsl_type(const char ** name,struct _mesa_glsl_parse_state * state) const2410 ast_type_specifier::glsl_type(const char **name,
2411 struct _mesa_glsl_parse_state *state) const
2412 {
2413 const struct glsl_type *type;
2414
2415 if (this->type != NULL)
2416 type = this->type;
2417 else if (structure)
2418 type = structure->type;
2419 else
2420 type = state->symbols->get_type(this->type_name);
2421 *name = this->type_name;
2422
2423 YYLTYPE loc = this->get_location();
2424 type = process_array_type(&loc, type, this->array_specifier, state);
2425
2426 return type;
2427 }
2428
2429 /**
2430 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2431 *
2432 * "The precision statement
2433 *
2434 * precision precision-qualifier type;
2435 *
2436 * can be used to establish a default precision qualifier. The type field can
2437 * be either int or float or any of the sampler types, (...) If type is float,
2438 * the directive applies to non-precision-qualified floating point type
2439 * (scalar, vector, and matrix) declarations. If type is int, the directive
2440 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2441 * and unsigned) declarations."
2442 *
2443 * We use the symbol table to keep the values of the default precisions for
2444 * each 'type' in each scope and we use the 'type' string from the precision
2445 * statement as key in the symbol table. When we want to retrieve the default
2446 * precision associated with a given glsl_type we need to know the type string
2447 * associated with it. This is what this function returns.
2448 */
2449 static const char *
get_type_name_for_precision_qualifier(const glsl_type * type)2450 get_type_name_for_precision_qualifier(const glsl_type *type)
2451 {
2452 switch (type->base_type) {
2453 case GLSL_TYPE_FLOAT:
2454 return "float";
2455 case GLSL_TYPE_UINT:
2456 case GLSL_TYPE_INT:
2457 return "int";
2458 case GLSL_TYPE_ATOMIC_UINT:
2459 return "atomic_uint";
2460 case GLSL_TYPE_IMAGE:
2461 /* fallthrough */
2462 case GLSL_TYPE_SAMPLER: {
2463 const unsigned type_idx =
2464 type->sampler_array + 2 * type->sampler_shadow;
2465 const unsigned offset = type->is_sampler() ? 0 : 4;
2466 assert(type_idx < 4);
2467 switch (type->sampled_type) {
2468 case GLSL_TYPE_FLOAT:
2469 switch (type->sampler_dimensionality) {
2470 case GLSL_SAMPLER_DIM_1D: {
2471 assert(type->is_sampler());
2472 static const char *const names[4] = {
2473 "sampler1D", "sampler1DArray",
2474 "sampler1DShadow", "sampler1DArrayShadow"
2475 };
2476 return names[type_idx];
2477 }
2478 case GLSL_SAMPLER_DIM_2D: {
2479 static const char *const names[8] = {
2480 "sampler2D", "sampler2DArray",
2481 "sampler2DShadow", "sampler2DArrayShadow",
2482 "image2D", "image2DArray", NULL, NULL
2483 };
2484 return names[offset + type_idx];
2485 }
2486 case GLSL_SAMPLER_DIM_3D: {
2487 static const char *const names[8] = {
2488 "sampler3D", NULL, NULL, NULL,
2489 "image3D", NULL, NULL, NULL
2490 };
2491 return names[offset + type_idx];
2492 }
2493 case GLSL_SAMPLER_DIM_CUBE: {
2494 static const char *const names[8] = {
2495 "samplerCube", "samplerCubeArray",
2496 "samplerCubeShadow", "samplerCubeArrayShadow",
2497 "imageCube", NULL, NULL, NULL
2498 };
2499 return names[offset + type_idx];
2500 }
2501 case GLSL_SAMPLER_DIM_MS: {
2502 assert(type->is_sampler());
2503 static const char *const names[4] = {
2504 "sampler2DMS", "sampler2DMSArray", NULL, NULL
2505 };
2506 return names[type_idx];
2507 }
2508 case GLSL_SAMPLER_DIM_RECT: {
2509 assert(type->is_sampler());
2510 static const char *const names[4] = {
2511 "samplerRect", NULL, "samplerRectShadow", NULL
2512 };
2513 return names[type_idx];
2514 }
2515 case GLSL_SAMPLER_DIM_BUF: {
2516 static const char *const names[8] = {
2517 "samplerBuffer", NULL, NULL, NULL,
2518 "imageBuffer", NULL, NULL, NULL
2519 };
2520 return names[offset + type_idx];
2521 }
2522 case GLSL_SAMPLER_DIM_EXTERNAL: {
2523 assert(type->is_sampler());
2524 static const char *const names[4] = {
2525 "samplerExternalOES", NULL, NULL, NULL
2526 };
2527 return names[type_idx];
2528 }
2529 default:
2530 unreachable("Unsupported sampler/image dimensionality");
2531 } /* sampler/image float dimensionality */
2532 break;
2533 case GLSL_TYPE_INT:
2534 switch (type->sampler_dimensionality) {
2535 case GLSL_SAMPLER_DIM_1D: {
2536 assert(type->is_sampler());
2537 static const char *const names[4] = {
2538 "isampler1D", "isampler1DArray", NULL, NULL
2539 };
2540 return names[type_idx];
2541 }
2542 case GLSL_SAMPLER_DIM_2D: {
2543 static const char *const names[8] = {
2544 "isampler2D", "isampler2DArray", NULL, NULL,
2545 "iimage2D", "iimage2DArray", NULL, NULL
2546 };
2547 return names[offset + type_idx];
2548 }
2549 case GLSL_SAMPLER_DIM_3D: {
2550 static const char *const names[8] = {
2551 "isampler3D", NULL, NULL, NULL,
2552 "iimage3D", NULL, NULL, NULL
2553 };
2554 return names[offset + type_idx];
2555 }
2556 case GLSL_SAMPLER_DIM_CUBE: {
2557 static const char *const names[8] = {
2558 "isamplerCube", "isamplerCubeArray", NULL, NULL,
2559 "iimageCube", NULL, NULL, NULL
2560 };
2561 return names[offset + type_idx];
2562 }
2563 case GLSL_SAMPLER_DIM_MS: {
2564 assert(type->is_sampler());
2565 static const char *const names[4] = {
2566 "isampler2DMS", "isampler2DMSArray", NULL, NULL
2567 };
2568 return names[type_idx];
2569 }
2570 case GLSL_SAMPLER_DIM_RECT: {
2571 assert(type->is_sampler());
2572 static const char *const names[4] = {
2573 "isamplerRect", NULL, "isamplerRectShadow", NULL
2574 };
2575 return names[type_idx];
2576 }
2577 case GLSL_SAMPLER_DIM_BUF: {
2578 static const char *const names[8] = {
2579 "isamplerBuffer", NULL, NULL, NULL,
2580 "iimageBuffer", NULL, NULL, NULL
2581 };
2582 return names[offset + type_idx];
2583 }
2584 default:
2585 unreachable("Unsupported isampler/iimage dimensionality");
2586 } /* sampler/image int dimensionality */
2587 break;
2588 case GLSL_TYPE_UINT:
2589 switch (type->sampler_dimensionality) {
2590 case GLSL_SAMPLER_DIM_1D: {
2591 assert(type->is_sampler());
2592 static const char *const names[4] = {
2593 "usampler1D", "usampler1DArray", NULL, NULL
2594 };
2595 return names[type_idx];
2596 }
2597 case GLSL_SAMPLER_DIM_2D: {
2598 static const char *const names[8] = {
2599 "usampler2D", "usampler2DArray", NULL, NULL,
2600 "uimage2D", "uimage2DArray", NULL, NULL
2601 };
2602 return names[offset + type_idx];
2603 }
2604 case GLSL_SAMPLER_DIM_3D: {
2605 static const char *const names[8] = {
2606 "usampler3D", NULL, NULL, NULL,
2607 "uimage3D", NULL, NULL, NULL
2608 };
2609 return names[offset + type_idx];
2610 }
2611 case GLSL_SAMPLER_DIM_CUBE: {
2612 static const char *const names[8] = {
2613 "usamplerCube", "usamplerCubeArray", NULL, NULL,
2614 "uimageCube", NULL, NULL, NULL
2615 };
2616 return names[offset + type_idx];
2617 }
2618 case GLSL_SAMPLER_DIM_MS: {
2619 assert(type->is_sampler());
2620 static const char *const names[4] = {
2621 "usampler2DMS", "usampler2DMSArray", NULL, NULL
2622 };
2623 return names[type_idx];
2624 }
2625 case GLSL_SAMPLER_DIM_RECT: {
2626 assert(type->is_sampler());
2627 static const char *const names[4] = {
2628 "usamplerRect", NULL, "usamplerRectShadow", NULL
2629 };
2630 return names[type_idx];
2631 }
2632 case GLSL_SAMPLER_DIM_BUF: {
2633 static const char *const names[8] = {
2634 "usamplerBuffer", NULL, NULL, NULL,
2635 "uimageBuffer", NULL, NULL, NULL
2636 };
2637 return names[offset + type_idx];
2638 }
2639 default:
2640 unreachable("Unsupported usampler/uimage dimensionality");
2641 } /* sampler/image uint dimensionality */
2642 break;
2643 default:
2644 unreachable("Unsupported sampler/image type");
2645 } /* sampler/image type */
2646 break;
2647 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2648 break;
2649 default:
2650 unreachable("Unsupported type");
2651 } /* base type */
2652 }
2653
2654 static unsigned
select_gles_precision(unsigned qual_precision,const glsl_type * type,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)2655 select_gles_precision(unsigned qual_precision,
2656 const glsl_type *type,
2657 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
2658 {
2659 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2660 * In GLES we take the precision from the type qualifier if present,
2661 * otherwise, if the type of the variable allows precision qualifiers at
2662 * all, we look for the default precision qualifier for that type in the
2663 * current scope.
2664 */
2665 assert(state->es_shader);
2666
2667 unsigned precision = GLSL_PRECISION_NONE;
2668 if (qual_precision) {
2669 precision = qual_precision;
2670 } else if (precision_qualifier_allowed(type)) {
2671 const char *type_name =
2672 get_type_name_for_precision_qualifier(type->without_array());
2673 assert(type_name != NULL);
2674
2675 precision =
2676 state->symbols->get_default_precision_qualifier(type_name);
2677 if (precision == ast_precision_none) {
2678 _mesa_glsl_error(loc, state,
2679 "No precision specified in this scope for type `%s'",
2680 type->name);
2681 }
2682 }
2683
2684
2685 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2686 *
2687 * "The default precision of all atomic types is highp. It is an error to
2688 * declare an atomic type with a different precision or to specify the
2689 * default precision for an atomic type to be lowp or mediump."
2690 */
2691 if (type->is_atomic_uint() && precision != ast_precision_high) {
2692 _mesa_glsl_error(loc, state,
2693 "atomic_uint can only have highp precision qualifier");
2694 }
2695
2696 return precision;
2697 }
2698
2699 const glsl_type *
glsl_type(const char ** name,struct _mesa_glsl_parse_state * state) const2700 ast_fully_specified_type::glsl_type(const char **name,
2701 struct _mesa_glsl_parse_state *state) const
2702 {
2703 return this->specifier->glsl_type(name, state);
2704 }
2705
2706 /**
2707 * Determine whether a toplevel variable declaration declares a varying. This
2708 * function operates by examining the variable's mode and the shader target,
2709 * so it correctly identifies linkage variables regardless of whether they are
2710 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2711 *
2712 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2713 * this function will produce undefined results.
2714 */
2715 static bool
is_varying_var(ir_variable * var,gl_shader_stage target)2716 is_varying_var(ir_variable *var, gl_shader_stage target)
2717 {
2718 switch (target) {
2719 case MESA_SHADER_VERTEX:
2720 return var->data.mode == ir_var_shader_out;
2721 case MESA_SHADER_FRAGMENT:
2722 return var->data.mode == ir_var_shader_in ||
2723 (var->data.mode == ir_var_system_value &&
2724 var->data.location == SYSTEM_VALUE_FRAG_COORD);
2725 default:
2726 return var->data.mode == ir_var_shader_out || var->data.mode == ir_var_shader_in;
2727 }
2728 }
2729
2730 static bool
is_allowed_invariant(ir_variable * var,struct _mesa_glsl_parse_state * state)2731 is_allowed_invariant(ir_variable *var, struct _mesa_glsl_parse_state *state)
2732 {
2733 if (is_varying_var(var, state->stage))
2734 return true;
2735
2736 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2737 * "Only variables output from a vertex shader can be candidates
2738 * for invariance".
2739 */
2740 if (!state->is_version(130, 100))
2741 return false;
2742
2743 /*
2744 * Later specs remove this language - so allowed invariant
2745 * on fragment shader outputs as well.
2746 */
2747 if (state->stage == MESA_SHADER_FRAGMENT &&
2748 var->data.mode == ir_var_shader_out)
2749 return true;
2750 return false;
2751 }
2752
2753 /**
2754 * Matrix layout qualifiers are only allowed on certain types
2755 */
2756 static void
validate_matrix_layout_for_type(struct _mesa_glsl_parse_state * state,YYLTYPE * loc,const glsl_type * type,ir_variable * var)2757 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state *state,
2758 YYLTYPE *loc,
2759 const glsl_type *type,
2760 ir_variable *var)
2761 {
2762 if (var && !var->is_in_buffer_block()) {
2763 /* Layout qualifiers may only apply to interface blocks and fields in
2764 * them.
2765 */
2766 _mesa_glsl_error(loc, state,
2767 "uniform block layout qualifiers row_major and "
2768 "column_major may not be applied to variables "
2769 "outside of uniform blocks");
2770 } else if (!type->without_array()->is_matrix()) {
2771 /* The OpenGL ES 3.0 conformance tests did not originally allow
2772 * matrix layout qualifiers on non-matrices. However, the OpenGL
2773 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2774 * amended to specifically allow these layouts on all types. Emit
2775 * a warning so that people know their code may not be portable.
2776 */
2777 _mesa_glsl_warning(loc, state,
2778 "uniform block layout qualifiers row_major and "
2779 "column_major applied to non-matrix types may "
2780 "be rejected by older compilers");
2781 }
2782 }
2783
2784 static bool
validate_xfb_buffer_qualifier(YYLTYPE * loc,struct _mesa_glsl_parse_state * state,unsigned xfb_buffer)2785 validate_xfb_buffer_qualifier(YYLTYPE *loc,
2786 struct _mesa_glsl_parse_state *state,
2787 unsigned xfb_buffer) {
2788 if (xfb_buffer >= state->Const.MaxTransformFeedbackBuffers) {
2789 _mesa_glsl_error(loc, state,
2790 "invalid xfb_buffer specified %d is larger than "
2791 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2792 xfb_buffer,
2793 state->Const.MaxTransformFeedbackBuffers - 1);
2794 return false;
2795 }
2796
2797 return true;
2798 }
2799
2800 /* From the ARB_enhanced_layouts spec:
2801 *
2802 * "Variables and block members qualified with *xfb_offset* can be
2803 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2804 * The offset must be a multiple of the size of the first component of
2805 * the first qualified variable or block member, or a compile-time error
2806 * results. Further, if applied to an aggregate containing a double,
2807 * the offset must also be a multiple of 8, and the space taken in the
2808 * buffer will be a multiple of 8.
2809 */
2810 static bool
validate_xfb_offset_qualifier(YYLTYPE * loc,struct _mesa_glsl_parse_state * state,int xfb_offset,const glsl_type * type,unsigned component_size)2811 validate_xfb_offset_qualifier(YYLTYPE *loc,
2812 struct _mesa_glsl_parse_state *state,
2813 int xfb_offset, const glsl_type *type,
2814 unsigned component_size) {
2815 const glsl_type *t_without_array = type->without_array();
2816
2817 if (xfb_offset != -1 && type->is_unsized_array()) {
2818 _mesa_glsl_error(loc, state,
2819 "xfb_offset can't be used with unsized arrays.");
2820 return false;
2821 }
2822
2823 /* Make sure nested structs don't contain unsized arrays, and validate
2824 * any xfb_offsets on interface members.
2825 */
2826 if (t_without_array->is_struct() || t_without_array->is_interface())
2827 for (unsigned int i = 0; i < t_without_array->length; i++) {
2828 const glsl_type *member_t = t_without_array->fields.structure[i].type;
2829
2830 /* When the interface block doesn't have an xfb_offset qualifier then
2831 * we apply the component size rules at the member level.
2832 */
2833 if (xfb_offset == -1)
2834 component_size = member_t->contains_double() ? 8 : 4;
2835
2836 int xfb_offset = t_without_array->fields.structure[i].offset;
2837 validate_xfb_offset_qualifier(loc, state, xfb_offset, member_t,
2838 component_size);
2839 }
2840
2841 /* Nested structs or interface block without offset may not have had an
2842 * offset applied yet so return.
2843 */
2844 if (xfb_offset == -1) {
2845 return true;
2846 }
2847
2848 if (xfb_offset % component_size) {
2849 _mesa_glsl_error(loc, state,
2850 "invalid qualifier xfb_offset=%d must be a multiple "
2851 "of the first component size of the first qualified "
2852 "variable or block member. Or double if an aggregate "
2853 "that contains a double (%d).",
2854 xfb_offset, component_size);
2855 return false;
2856 }
2857
2858 return true;
2859 }
2860
2861 static bool
validate_stream_qualifier(YYLTYPE * loc,struct _mesa_glsl_parse_state * state,unsigned stream)2862 validate_stream_qualifier(YYLTYPE *loc, struct _mesa_glsl_parse_state *state,
2863 unsigned stream)
2864 {
2865 if (stream >= state->ctx->Const.MaxVertexStreams) {
2866 _mesa_glsl_error(loc, state,
2867 "invalid stream specified %d is larger than "
2868 "MAX_VERTEX_STREAMS - 1 (%d).",
2869 stream, state->ctx->Const.MaxVertexStreams - 1);
2870 return false;
2871 }
2872
2873 return true;
2874 }
2875
2876 static void
apply_explicit_binding(struct _mesa_glsl_parse_state * state,YYLTYPE * loc,ir_variable * var,const glsl_type * type,const ast_type_qualifier * qual)2877 apply_explicit_binding(struct _mesa_glsl_parse_state *state,
2878 YYLTYPE *loc,
2879 ir_variable *var,
2880 const glsl_type *type,
2881 const ast_type_qualifier *qual)
2882 {
2883 if (!qual->flags.q.uniform && !qual->flags.q.buffer) {
2884 _mesa_glsl_error(loc, state,
2885 "the \"binding\" qualifier only applies to uniforms and "
2886 "shader storage buffer objects");
2887 return;
2888 }
2889
2890 unsigned qual_binding;
2891 if (!process_qualifier_constant(state, loc, "binding", qual->binding,
2892 &qual_binding)) {
2893 return;
2894 }
2895
2896 const struct gl_context *const ctx = state->ctx;
2897 unsigned elements = type->is_array() ? type->arrays_of_arrays_size() : 1;
2898 unsigned max_index = qual_binding + elements - 1;
2899 const glsl_type *base_type = type->without_array();
2900
2901 if (base_type->is_interface()) {
2902 /* UBOs. From page 60 of the GLSL 4.20 specification:
2903 * "If the binding point for any uniform block instance is less than zero,
2904 * or greater than or equal to the implementation-dependent maximum
2905 * number of uniform buffer bindings, a compilation error will occur.
2906 * When the binding identifier is used with a uniform block instanced as
2907 * an array of size N, all elements of the array from binding through
2908 * binding + N – 1 must be within this range."
2909 *
2910 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2911 */
2912 if (qual->flags.q.uniform &&
2913 max_index >= ctx->Const.MaxUniformBufferBindings) {
2914 _mesa_glsl_error(loc, state, "layout(binding = %u) for %d UBOs exceeds "
2915 "the maximum number of UBO binding points (%d)",
2916 qual_binding, elements,
2917 ctx->Const.MaxUniformBufferBindings);
2918 return;
2919 }
2920
2921 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2922 * "If the binding point for any uniform or shader storage block instance
2923 * is less than zero, or greater than or equal to the
2924 * implementation-dependent maximum number of uniform buffer bindings, a
2925 * compile-time error will occur. When the binding identifier is used
2926 * with a uniform or shader storage block instanced as an array of size
2927 * N, all elements of the array from binding through binding + N – 1 must
2928 * be within this range."
2929 */
2930 if (qual->flags.q.buffer &&
2931 max_index >= ctx->Const.MaxShaderStorageBufferBindings) {
2932 _mesa_glsl_error(loc, state, "layout(binding = %u) for %d SSBOs exceeds "
2933 "the maximum number of SSBO binding points (%d)",
2934 qual_binding, elements,
2935 ctx->Const.MaxShaderStorageBufferBindings);
2936 return;
2937 }
2938 } else if (base_type->is_sampler()) {
2939 /* Samplers. From page 63 of the GLSL 4.20 specification:
2940 * "If the binding is less than zero, or greater than or equal to the
2941 * implementation-dependent maximum supported number of units, a
2942 * compilation error will occur. When the binding identifier is used
2943 * with an array of size N, all elements of the array from binding
2944 * through binding + N - 1 must be within this range."
2945 */
2946 unsigned limit = ctx->Const.MaxCombinedTextureImageUnits;
2947
2948 if (max_index >= limit) {
2949 _mesa_glsl_error(loc, state, "layout(binding = %d) for %d samplers "
2950 "exceeds the maximum number of texture image units "
2951 "(%u)", qual_binding, elements, limit);
2952
2953 return;
2954 }
2955 } else if (base_type->contains_atomic()) {
2956 assert(ctx->Const.MaxAtomicBufferBindings <= MAX_COMBINED_ATOMIC_BUFFERS);
2957 if (qual_binding >= ctx->Const.MaxAtomicBufferBindings) {
2958 _mesa_glsl_error(loc, state, "layout(binding = %d) exceeds the "
2959 "maximum number of atomic counter buffer bindings "
2960 "(%u)", qual_binding,
2961 ctx->Const.MaxAtomicBufferBindings);
2962
2963 return;
2964 }
2965 } else if ((state->is_version(420, 310) ||
2966 state->ARB_shading_language_420pack_enable) &&
2967 base_type->is_image()) {
2968 assert(ctx->Const.MaxImageUnits <= MAX_IMAGE_UNITS);
2969 if (max_index >= ctx->Const.MaxImageUnits) {
2970 _mesa_glsl_error(loc, state, "Image binding %d exceeds the "
2971 "maximum number of image units (%d)", max_index,
2972 ctx->Const.MaxImageUnits);
2973 return;
2974 }
2975
2976 } else {
2977 _mesa_glsl_error(loc, state,
2978 "the \"binding\" qualifier only applies to uniform "
2979 "blocks, storage blocks, opaque variables, or arrays "
2980 "thereof");
2981 return;
2982 }
2983
2984 var->data.explicit_binding = true;
2985 var->data.binding = qual_binding;
2986
2987 return;
2988 }
2989
2990 static void
validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state * state,YYLTYPE * loc,const glsl_interp_mode interpolation,const struct glsl_type * var_type,ir_variable_mode mode)2991 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state *state,
2992 YYLTYPE *loc,
2993 const glsl_interp_mode interpolation,
2994 const struct glsl_type *var_type,
2995 ir_variable_mode mode)
2996 {
2997 if (state->stage != MESA_SHADER_FRAGMENT ||
2998 interpolation == INTERP_MODE_FLAT ||
2999 mode != ir_var_shader_in)
3000 return;
3001
3002 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3003 * so must integer vertex outputs.
3004 *
3005 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3006 * "Fragment shader inputs that are signed or unsigned integers or
3007 * integer vectors must be qualified with the interpolation qualifier
3008 * flat."
3009 *
3010 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3011 * "Fragment shader inputs that are, or contain, signed or unsigned
3012 * integers or integer vectors must be qualified with the
3013 * interpolation qualifier flat."
3014 *
3015 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3016 * "Vertex shader outputs that are, or contain, signed or unsigned
3017 * integers or integer vectors must be qualified with the
3018 * interpolation qualifier flat."
3019 *
3020 * Note that prior to GLSL 1.50, this requirement applied to vertex
3021 * outputs rather than fragment inputs. That creates problems in the
3022 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3023 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3024 * apply the restriction to both vertex outputs and fragment inputs.
3025 *
3026 * Note also that the desktop GLSL specs are missing the text "or
3027 * contain"; this is presumably an oversight, since there is no
3028 * reasonable way to interpolate a fragment shader input that contains
3029 * an integer. See Khronos bug #15671.
3030 */
3031 if ((state->is_version(130, 300) || state->EXT_gpu_shader4_enable)
3032 && var_type->contains_integer()) {
3033 _mesa_glsl_error(loc, state, "if a fragment input is (or contains) "
3034 "an integer, then it must be qualified with 'flat'");
3035 }
3036
3037 /* Double fragment inputs must be qualified with 'flat'.
3038 *
3039 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3040 * "This extension does not support interpolation of double-precision
3041 * values; doubles used as fragment shader inputs must be qualified as
3042 * "flat"."
3043 *
3044 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3045 * "Fragment shader inputs that are signed or unsigned integers, integer
3046 * vectors, or any double-precision floating-point type must be
3047 * qualified with the interpolation qualifier flat."
3048 *
3049 * Note that the GLSL specs are missing the text "or contain"; this is
3050 * presumably an oversight. See Khronos bug #15671.
3051 *
3052 * The 'double' type does not exist in GLSL ES so far.
3053 */
3054 if (state->has_double()
3055 && var_type->contains_double()) {
3056 _mesa_glsl_error(loc, state, "if a fragment input is (or contains) "
3057 "a double, then it must be qualified with 'flat'");
3058 }
3059
3060 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3061 *
3062 * From section 4.3.4 of the ARB_bindless_texture spec:
3063 *
3064 * "(modify last paragraph, p. 35, allowing samplers and images as
3065 * fragment shader inputs) ... Fragment inputs can only be signed and
3066 * unsigned integers and integer vectors, floating point scalars,
3067 * floating-point vectors, matrices, sampler and image types, or arrays
3068 * or structures of these. Fragment shader inputs that are signed or
3069 * unsigned integers, integer vectors, or any double-precision floating-
3070 * point type, or any sampler or image type must be qualified with the
3071 * interpolation qualifier "flat"."
3072 */
3073 if (state->has_bindless()
3074 && (var_type->contains_sampler() || var_type->contains_image())) {
3075 _mesa_glsl_error(loc, state, "if a fragment input is (or contains) "
3076 "a bindless sampler (or image), then it must be "
3077 "qualified with 'flat'");
3078 }
3079 }
3080
3081 static void
validate_interpolation_qualifier(struct _mesa_glsl_parse_state * state,YYLTYPE * loc,const glsl_interp_mode interpolation,const struct ast_type_qualifier * qual,const struct glsl_type * var_type,ir_variable_mode mode)3082 validate_interpolation_qualifier(struct _mesa_glsl_parse_state *state,
3083 YYLTYPE *loc,
3084 const glsl_interp_mode interpolation,
3085 const struct ast_type_qualifier *qual,
3086 const struct glsl_type *var_type,
3087 ir_variable_mode mode)
3088 {
3089 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3090 * not to vertex shader inputs nor fragment shader outputs.
3091 *
3092 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3093 * "Outputs from a vertex shader (out) and inputs to a fragment
3094 * shader (in) can be further qualified with one or more of these
3095 * interpolation qualifiers"
3096 * ...
3097 * "These interpolation qualifiers may only precede the qualifiers in,
3098 * centroid in, out, or centroid out in a declaration. They do not apply
3099 * to the deprecated storage qualifiers varying or centroid
3100 * varying. They also do not apply to inputs into a vertex shader or
3101 * outputs from a fragment shader."
3102 *
3103 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3104 * "Outputs from a shader (out) and inputs to a shader (in) can be
3105 * further qualified with one of these interpolation qualifiers."
3106 * ...
3107 * "These interpolation qualifiers may only precede the qualifiers
3108 * in, centroid in, out, or centroid out in a declaration. They do
3109 * not apply to inputs into a vertex shader or outputs from a
3110 * fragment shader."
3111 */
3112 if ((state->is_version(130, 300) || state->EXT_gpu_shader4_enable)
3113 && interpolation != INTERP_MODE_NONE) {
3114 const char *i = interpolation_string(interpolation);
3115 if (mode != ir_var_shader_in && mode != ir_var_shader_out)
3116 _mesa_glsl_error(loc, state,
3117 "interpolation qualifier `%s' can only be applied to "
3118 "shader inputs or outputs.", i);
3119
3120 switch (state->stage) {
3121 case MESA_SHADER_VERTEX:
3122 if (mode == ir_var_shader_in) {
3123 _mesa_glsl_error(loc, state,
3124 "interpolation qualifier '%s' cannot be applied to "
3125 "vertex shader inputs", i);
3126 }
3127 break;
3128 case MESA_SHADER_FRAGMENT:
3129 if (mode == ir_var_shader_out) {
3130 _mesa_glsl_error(loc, state,
3131 "interpolation qualifier '%s' cannot be applied to "
3132 "fragment shader outputs", i);
3133 }
3134 break;
3135 default:
3136 break;
3137 }
3138 }
3139
3140 /* Interpolation qualifiers cannot be applied to 'centroid' and
3141 * 'centroid varying'.
3142 *
3143 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3144 * "interpolation qualifiers may only precede the qualifiers in,
3145 * centroid in, out, or centroid out in a declaration. They do not apply
3146 * to the deprecated storage qualifiers varying or centroid varying."
3147 *
3148 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3149 *
3150 * GL_EXT_gpu_shader4 allows this.
3151 */
3152 if (state->is_version(130, 0) && !state->EXT_gpu_shader4_enable
3153 && interpolation != INTERP_MODE_NONE
3154 && qual->flags.q.varying) {
3155
3156 const char *i = interpolation_string(interpolation);
3157 const char *s;
3158 if (qual->flags.q.centroid)
3159 s = "centroid varying";
3160 else
3161 s = "varying";
3162
3163 _mesa_glsl_error(loc, state,
3164 "qualifier '%s' cannot be applied to the "
3165 "deprecated storage qualifier '%s'", i, s);
3166 }
3167
3168 validate_fragment_flat_interpolation_input(state, loc, interpolation,
3169 var_type, mode);
3170 }
3171
3172 static glsl_interp_mode
interpret_interpolation_qualifier(const struct ast_type_qualifier * qual,const struct glsl_type * var_type,ir_variable_mode mode,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)3173 interpret_interpolation_qualifier(const struct ast_type_qualifier *qual,
3174 const struct glsl_type *var_type,
3175 ir_variable_mode mode,
3176 struct _mesa_glsl_parse_state *state,
3177 YYLTYPE *loc)
3178 {
3179 glsl_interp_mode interpolation;
3180 if (qual->flags.q.flat)
3181 interpolation = INTERP_MODE_FLAT;
3182 else if (qual->flags.q.noperspective)
3183 interpolation = INTERP_MODE_NOPERSPECTIVE;
3184 else if (qual->flags.q.smooth)
3185 interpolation = INTERP_MODE_SMOOTH;
3186 else
3187 interpolation = INTERP_MODE_NONE;
3188
3189 validate_interpolation_qualifier(state, loc,
3190 interpolation,
3191 qual, var_type, mode);
3192
3193 return interpolation;
3194 }
3195
3196
3197 static void
apply_explicit_location(const struct ast_type_qualifier * qual,ir_variable * var,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)3198 apply_explicit_location(const struct ast_type_qualifier *qual,
3199 ir_variable *var,
3200 struct _mesa_glsl_parse_state *state,
3201 YYLTYPE *loc)
3202 {
3203 bool fail = false;
3204
3205 unsigned qual_location;
3206 if (!process_qualifier_constant(state, loc, "location", qual->location,
3207 &qual_location)) {
3208 return;
3209 }
3210
3211 /* Checks for GL_ARB_explicit_uniform_location. */
3212 if (qual->flags.q.uniform) {
3213 if (!state->check_explicit_uniform_location_allowed(loc, var))
3214 return;
3215
3216 const struct gl_context *const ctx = state->ctx;
3217 unsigned max_loc = qual_location + var->type->uniform_locations() - 1;
3218
3219 if (max_loc >= ctx->Const.MaxUserAssignableUniformLocations) {
3220 _mesa_glsl_error(loc, state, "location(s) consumed by uniform %s "
3221 ">= MAX_UNIFORM_LOCATIONS (%u)", var->name,
3222 ctx->Const.MaxUserAssignableUniformLocations);
3223 return;
3224 }
3225
3226 var->data.explicit_location = true;
3227 var->data.location = qual_location;
3228 return;
3229 }
3230
3231 /* Between GL_ARB_explicit_attrib_location an
3232 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3233 * stage can be assigned explicit locations. The checking here associates
3234 * the correct extension with the correct stage's input / output:
3235 *
3236 * input output
3237 * ----- ------
3238 * vertex explicit_loc sso
3239 * tess control sso sso
3240 * tess eval sso sso
3241 * geometry sso sso
3242 * fragment sso explicit_loc
3243 */
3244 switch (state->stage) {
3245 case MESA_SHADER_VERTEX:
3246 if (var->data.mode == ir_var_shader_in) {
3247 if (!state->check_explicit_attrib_location_allowed(loc, var))
3248 return;
3249
3250 break;
3251 }
3252
3253 if (var->data.mode == ir_var_shader_out) {
3254 if (!state->check_separate_shader_objects_allowed(loc, var))
3255 return;
3256
3257 break;
3258 }
3259
3260 fail = true;
3261 break;
3262
3263 case MESA_SHADER_TESS_CTRL:
3264 case MESA_SHADER_TESS_EVAL:
3265 case MESA_SHADER_GEOMETRY:
3266 if (var->data.mode == ir_var_shader_in || var->data.mode == ir_var_shader_out) {
3267 if (!state->check_separate_shader_objects_allowed(loc, var))
3268 return;
3269
3270 break;
3271 }
3272
3273 fail = true;
3274 break;
3275
3276 case MESA_SHADER_FRAGMENT:
3277 if (var->data.mode == ir_var_shader_in) {
3278 if (!state->check_separate_shader_objects_allowed(loc, var))
3279 return;
3280
3281 break;
3282 }
3283
3284 if (var->data.mode == ir_var_shader_out) {
3285 if (!state->check_explicit_attrib_location_allowed(loc, var))
3286 return;
3287
3288 break;
3289 }
3290
3291 fail = true;
3292 break;
3293
3294 case MESA_SHADER_COMPUTE:
3295 _mesa_glsl_error(loc, state,
3296 "compute shader variables cannot be given "
3297 "explicit locations");
3298 return;
3299 default:
3300 fail = true;
3301 break;
3302 };
3303
3304 if (fail) {
3305 _mesa_glsl_error(loc, state,
3306 "%s cannot be given an explicit location in %s shader",
3307 mode_string(var),
3308 _mesa_shader_stage_to_string(state->stage));
3309 } else {
3310 var->data.explicit_location = true;
3311
3312 switch (state->stage) {
3313 case MESA_SHADER_VERTEX:
3314 var->data.location = (var->data.mode == ir_var_shader_in)
3315 ? (qual_location + VERT_ATTRIB_GENERIC0)
3316 : (qual_location + VARYING_SLOT_VAR0);
3317 break;
3318
3319 case MESA_SHADER_TESS_CTRL:
3320 case MESA_SHADER_TESS_EVAL:
3321 case MESA_SHADER_GEOMETRY:
3322 if (var->data.patch)
3323 var->data.location = qual_location + VARYING_SLOT_PATCH0;
3324 else
3325 var->data.location = qual_location + VARYING_SLOT_VAR0;
3326 break;
3327
3328 case MESA_SHADER_FRAGMENT:
3329 var->data.location = (var->data.mode == ir_var_shader_out)
3330 ? (qual_location + FRAG_RESULT_DATA0)
3331 : (qual_location + VARYING_SLOT_VAR0);
3332 break;
3333 default:
3334 assert(!"Unexpected shader type");
3335 break;
3336 }
3337
3338 /* Check if index was set for the uniform instead of the function */
3339 if (qual->flags.q.explicit_index && qual->is_subroutine_decl()) {
3340 _mesa_glsl_error(loc, state, "an index qualifier can only be "
3341 "used with subroutine functions");
3342 return;
3343 }
3344
3345 unsigned qual_index;
3346 if (qual->flags.q.explicit_index &&
3347 process_qualifier_constant(state, loc, "index", qual->index,
3348 &qual_index)) {
3349 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3350 * Layout Qualifiers):
3351 *
3352 * "It is also a compile-time error if a fragment shader
3353 * sets a layout index to less than 0 or greater than 1."
3354 *
3355 * Older specifications don't mandate a behavior; we take
3356 * this as a clarification and always generate the error.
3357 */
3358 if (qual_index > 1) {
3359 _mesa_glsl_error(loc, state,
3360 "explicit index may only be 0 or 1");
3361 } else {
3362 var->data.explicit_index = true;
3363 var->data.index = qual_index;
3364 }
3365 }
3366 }
3367 }
3368
3369 static bool
validate_storage_for_sampler_image_types(ir_variable * var,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)3370 validate_storage_for_sampler_image_types(ir_variable *var,
3371 struct _mesa_glsl_parse_state *state,
3372 YYLTYPE *loc)
3373 {
3374 /* From section 4.1.7 of the GLSL 4.40 spec:
3375 *
3376 * "[Opaque types] can only be declared as function
3377 * parameters or uniform-qualified variables."
3378 *
3379 * From section 4.1.7 of the ARB_bindless_texture spec:
3380 *
3381 * "Samplers may be declared as shader inputs and outputs, as uniform
3382 * variables, as temporary variables, and as function parameters."
3383 *
3384 * From section 4.1.X of the ARB_bindless_texture spec:
3385 *
3386 * "Images may be declared as shader inputs and outputs, as uniform
3387 * variables, as temporary variables, and as function parameters."
3388 */
3389 if (state->has_bindless()) {
3390 if (var->data.mode != ir_var_auto &&
3391 var->data.mode != ir_var_uniform &&
3392 var->data.mode != ir_var_shader_in &&
3393 var->data.mode != ir_var_shader_out &&
3394 var->data.mode != ir_var_function_in &&
3395 var->data.mode != ir_var_function_out &&
3396 var->data.mode != ir_var_function_inout) {
3397 _mesa_glsl_error(loc, state, "bindless image/sampler variables may "
3398 "only be declared as shader inputs and outputs, as "
3399 "uniform variables, as temporary variables and as "
3400 "function parameters");
3401 return false;
3402 }
3403 } else {
3404 if (var->data.mode != ir_var_uniform &&
3405 var->data.mode != ir_var_function_in) {
3406 _mesa_glsl_error(loc, state, "image/sampler variables may only be "
3407 "declared as function parameters or "
3408 "uniform-qualified global variables");
3409 return false;
3410 }
3411 }
3412 return true;
3413 }
3414
3415 static bool
validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state * state,YYLTYPE * loc,const struct ast_type_qualifier * qual,const glsl_type * type)3416 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state *state,
3417 YYLTYPE *loc,
3418 const struct ast_type_qualifier *qual,
3419 const glsl_type *type)
3420 {
3421 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3422 *
3423 * "Memory qualifiers are only supported in the declarations of image
3424 * variables, buffer variables, and shader storage blocks; it is an error
3425 * to use such qualifiers in any other declarations.
3426 */
3427 if (!type->is_image() && !qual->flags.q.buffer) {
3428 if (qual->flags.q.read_only ||
3429 qual->flags.q.write_only ||
3430 qual->flags.q.coherent ||
3431 qual->flags.q._volatile ||
3432 qual->flags.q.restrict_flag) {
3433 _mesa_glsl_error(loc, state, "memory qualifiers may only be applied "
3434 "in the declarations of image variables, buffer "
3435 "variables, and shader storage blocks");
3436 return false;
3437 }
3438 }
3439 return true;
3440 }
3441
3442 static bool
validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state * state,YYLTYPE * loc,const struct ast_type_qualifier * qual,const glsl_type * type)3443 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state *state,
3444 YYLTYPE *loc,
3445 const struct ast_type_qualifier *qual,
3446 const glsl_type *type)
3447 {
3448 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3449 *
3450 * "Format layout qualifiers can be used on image variable declarations
3451 * (those declared with a basic type having “image ” in its keyword)."
3452 */
3453 if (!type->is_image() && qual->flags.q.explicit_image_format) {
3454 _mesa_glsl_error(loc, state, "format layout qualifiers may only be "
3455 "applied to images");
3456 return false;
3457 }
3458 return true;
3459 }
3460
3461 static void
apply_image_qualifier_to_variable(const struct ast_type_qualifier * qual,ir_variable * var,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)3462 apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual,
3463 ir_variable *var,
3464 struct _mesa_glsl_parse_state *state,
3465 YYLTYPE *loc)
3466 {
3467 const glsl_type *base_type = var->type->without_array();
3468
3469 if (!validate_image_format_qualifier_for_type(state, loc, qual, base_type) ||
3470 !validate_memory_qualifier_for_type(state, loc, qual, base_type))
3471 return;
3472
3473 if (!base_type->is_image())
3474 return;
3475
3476 if (!validate_storage_for_sampler_image_types(var, state, loc))
3477 return;
3478
3479 var->data.memory_read_only |= qual->flags.q.read_only;
3480 var->data.memory_write_only |= qual->flags.q.write_only;
3481 var->data.memory_coherent |= qual->flags.q.coherent;
3482 var->data.memory_volatile |= qual->flags.q._volatile;
3483 var->data.memory_restrict |= qual->flags.q.restrict_flag;
3484
3485 if (qual->flags.q.explicit_image_format) {
3486 if (var->data.mode == ir_var_function_in) {
3487 _mesa_glsl_error(loc, state, "format qualifiers cannot be used on "
3488 "image function parameters");
3489 }
3490
3491 if (qual->image_base_type != base_type->sampled_type) {
3492 _mesa_glsl_error(loc, state, "format qualifier doesn't match the base "
3493 "data type of the image");
3494 }
3495
3496 var->data.image_format = qual->image_format;
3497 } else if (state->has_image_load_formatted()) {
3498 if (var->data.mode == ir_var_uniform &&
3499 state->EXT_shader_image_load_formatted_warn) {
3500 _mesa_glsl_warning(loc, state, "GL_EXT_image_load_formatted used");
3501 }
3502 } else {
3503 if (var->data.mode == ir_var_uniform) {
3504 if (state->es_shader ||
3505 !(state->is_version(420, 310) || state->ARB_shader_image_load_store_enable)) {
3506 _mesa_glsl_error(loc, state, "all image uniforms must have a "
3507 "format layout qualifier");
3508 } else if (!qual->flags.q.write_only) {
3509 _mesa_glsl_error(loc, state, "image uniforms not qualified with "
3510 "`writeonly' must have a format layout qualifier");
3511 }
3512 }
3513 var->data.image_format = GL_NONE;
3514 }
3515
3516 /* From page 70 of the GLSL ES 3.1 specification:
3517 *
3518 * "Except for image variables qualified with the format qualifiers r32f,
3519 * r32i, and r32ui, image variables must specify either memory qualifier
3520 * readonly or the memory qualifier writeonly."
3521 */
3522 if (state->es_shader &&
3523 var->data.image_format != GL_R32F &&
3524 var->data.image_format != GL_R32I &&
3525 var->data.image_format != GL_R32UI &&
3526 !var->data.memory_read_only &&
3527 !var->data.memory_write_only) {
3528 _mesa_glsl_error(loc, state, "image variables of format other than r32f, "
3529 "r32i or r32ui must be qualified `readonly' or "
3530 "`writeonly'");
3531 }
3532 }
3533
3534 static inline const char*
get_layout_qualifier_string(bool origin_upper_left,bool pixel_center_integer)3535 get_layout_qualifier_string(bool origin_upper_left, bool pixel_center_integer)
3536 {
3537 if (origin_upper_left && pixel_center_integer)
3538 return "origin_upper_left, pixel_center_integer";
3539 else if (origin_upper_left)
3540 return "origin_upper_left";
3541 else if (pixel_center_integer)
3542 return "pixel_center_integer";
3543 else
3544 return " ";
3545 }
3546
3547 static inline bool
is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state * state,const struct ast_type_qualifier * qual)3548 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state *state,
3549 const struct ast_type_qualifier *qual)
3550 {
3551 /* If gl_FragCoord was previously declared, and the qualifiers were
3552 * different in any way, return true.
3553 */
3554 if (state->fs_redeclares_gl_fragcoord) {
3555 return (state->fs_pixel_center_integer != qual->flags.q.pixel_center_integer
3556 || state->fs_origin_upper_left != qual->flags.q.origin_upper_left);
3557 }
3558
3559 return false;
3560 }
3561
3562 static inline void
validate_array_dimensions(const glsl_type * t,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)3563 validate_array_dimensions(const glsl_type *t,
3564 struct _mesa_glsl_parse_state *state,
3565 YYLTYPE *loc) {
3566 if (t->is_array()) {
3567 t = t->fields.array;
3568 while (t->is_array()) {
3569 if (t->is_unsized_array()) {
3570 _mesa_glsl_error(loc, state,
3571 "only the outermost array dimension can "
3572 "be unsized",
3573 t->name);
3574 break;
3575 }
3576 t = t->fields.array;
3577 }
3578 }
3579 }
3580
3581 static void
apply_bindless_qualifier_to_variable(const struct ast_type_qualifier * qual,ir_variable * var,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)3582 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier *qual,
3583 ir_variable *var,
3584 struct _mesa_glsl_parse_state *state,
3585 YYLTYPE *loc)
3586 {
3587 bool has_local_qualifiers = qual->flags.q.bindless_sampler ||
3588 qual->flags.q.bindless_image ||
3589 qual->flags.q.bound_sampler ||
3590 qual->flags.q.bound_image;
3591
3592 /* The ARB_bindless_texture spec says:
3593 *
3594 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3595 * spec"
3596 *
3597 * "If these layout qualifiers are applied to other types of default block
3598 * uniforms, or variables with non-uniform storage, a compile-time error
3599 * will be generated."
3600 */
3601 if (has_local_qualifiers && !qual->flags.q.uniform) {
3602 _mesa_glsl_error(loc, state, "ARB_bindless_texture layout qualifiers "
3603 "can only be applied to default block uniforms or "
3604 "variables with uniform storage");
3605 return;
3606 }
3607
3608 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3609 * but it makes sense to only allow bindless_sampler/bound_sampler for
3610 * sampler types, and respectively bindless_image/bound_image for image
3611 * types.
3612 */
3613 if ((qual->flags.q.bindless_sampler || qual->flags.q.bound_sampler) &&
3614 !var->type->contains_sampler()) {
3615 _mesa_glsl_error(loc, state, "bindless_sampler or bound_sampler can only "
3616 "be applied to sampler types");
3617 return;
3618 }
3619
3620 if ((qual->flags.q.bindless_image || qual->flags.q.bound_image) &&
3621 !var->type->contains_image()) {
3622 _mesa_glsl_error(loc, state, "bindless_image or bound_image can only be "
3623 "applied to image types");
3624 return;
3625 }
3626
3627 /* The bindless_sampler/bindless_image (and respectively
3628 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3629 * local scope.
3630 */
3631 if (var->type->contains_sampler() || var->type->contains_image()) {
3632 var->data.bindless = qual->flags.q.bindless_sampler ||
3633 qual->flags.q.bindless_image ||
3634 state->bindless_sampler_specified ||
3635 state->bindless_image_specified;
3636
3637 var->data.bound = qual->flags.q.bound_sampler ||
3638 qual->flags.q.bound_image ||
3639 state->bound_sampler_specified ||
3640 state->bound_image_specified;
3641 }
3642 }
3643
3644 static void
apply_layout_qualifier_to_variable(const struct ast_type_qualifier * qual,ir_variable * var,struct _mesa_glsl_parse_state * state,YYLTYPE * loc)3645 apply_layout_qualifier_to_variable(const struct ast_type_qualifier *qual,
3646 ir_variable *var,
3647 struct _mesa_glsl_parse_state *state,
3648 YYLTYPE *loc)
3649 {
3650 if (var->name != NULL && strcmp(var->name, "gl_FragCoord") == 0) {
3651
3652 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3653 *
3654 * "Within any shader, the first redeclarations of gl_FragCoord
3655 * must appear before any use of gl_FragCoord."
3656 *
3657 * Generate a compiler error if above condition is not met by the
3658 * fragment shader.
3659 */
3660 ir_variable *earlier = state->symbols->get_variable("gl_FragCoord");
3661 if (earlier != NULL &&
3662 earlier->data.used &&
3663 !state->fs_redeclares_gl_fragcoord) {
3664 _mesa_glsl_error(loc, state,
3665 "gl_FragCoord used before its first redeclaration "
3666 "in fragment shader");
3667 }
3668
3669 /* Make sure all gl_FragCoord redeclarations specify the same layout
3670 * qualifiers.
3671 */
3672 if (is_conflicting_fragcoord_redeclaration(state, qual)) {
3673 const char *const qual_string =
3674 get_layout_qualifier_string(qual->flags.q.origin_upper_left,
3675 qual->flags.q.pixel_center_integer);
3676
3677 const char *const state_string =
3678 get_layout_qualifier_string(state->fs_origin_upper_left,
3679 state->fs_pixel_center_integer);
3680
3681 _mesa_glsl_error(loc, state,
3682 "gl_FragCoord redeclared with different layout "
3683 "qualifiers (%s) and (%s) ",
3684 state_string,
3685 qual_string);
3686 }
3687 state->fs_origin_upper_left = qual->flags.q.origin_upper_left;
3688 state->fs_pixel_center_integer = qual->flags.q.pixel_center_integer;
3689 state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers =
3690 !qual->flags.q.origin_upper_left && !qual->flags.q.pixel_center_integer;
3691 state->fs_redeclares_gl_fragcoord =
3692 state->fs_origin_upper_left ||
3693 state->fs_pixel_center_integer ||
3694 state->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers;
3695 }
3696
3697 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
3698 && (strcmp(var->name, "gl_FragCoord") != 0)) {
3699 const char *const qual_string = (qual->flags.q.origin_upper_left)
3700 ? "origin_upper_left" : "pixel_center_integer";
3701
3702 _mesa_glsl_error(loc, state,
3703 "layout qualifier `%s' can only be applied to "
3704 "fragment shader input `gl_FragCoord'",
3705 qual_string);
3706 }
3707
3708 if (qual->flags.q.explicit_location) {
3709 apply_explicit_location(qual, var, state, loc);
3710
3711 if (qual->flags.q.explicit_component) {
3712 unsigned qual_component;
3713 if (process_qualifier_constant(state, loc, "component",
3714 qual->component, &qual_component)) {
3715 const glsl_type *type = var->type->without_array();
3716 unsigned components = type->component_slots();
3717
3718 if (type->is_matrix() || type->is_struct()) {
3719 _mesa_glsl_error(loc, state, "component layout qualifier "
3720 "cannot be applied to a matrix, a structure, "
3721 "a block, or an array containing any of "
3722 "these.");
3723 } else if (components > 4 && type->is_64bit()) {
3724 _mesa_glsl_error(loc, state, "component layout qualifier "
3725 "cannot be applied to dvec%u.",
3726 components / 2);
3727 } else if (qual_component != 0 &&
3728 (qual_component + components - 1) > 3) {
3729 _mesa_glsl_error(loc, state, "component overflow (%u > 3)",
3730 (qual_component + components - 1));
3731 } else if (qual_component == 1 && type->is_64bit()) {
3732 /* We don't bother checking for 3 as it should be caught by the
3733 * overflow check above.
3734 */
3735 _mesa_glsl_error(loc, state, "doubles cannot begin at "
3736 "component 1 or 3");
3737 } else {
3738 var->data.explicit_component = true;
3739 var->data.location_frac = qual_component;
3740 }
3741 }
3742 }
3743 } else if (qual->flags.q.explicit_index) {
3744 if (!qual->subroutine_list)
3745 _mesa_glsl_error(loc, state,
3746 "explicit index requires explicit location");
3747 } else if (qual->flags.q.explicit_component) {
3748 _mesa_glsl_error(loc, state,
3749 "explicit component requires explicit location");
3750 }
3751
3752 if (qual->flags.q.explicit_binding) {
3753 apply_explicit_binding(state, loc, var, var->type, qual);
3754 }
3755
3756 if (state->stage == MESA_SHADER_GEOMETRY &&
3757 qual->flags.q.out && qual->flags.q.stream) {
3758 unsigned qual_stream;
3759 if (process_qualifier_constant(state, loc, "stream", qual->stream,
3760 &qual_stream) &&
3761 validate_stream_qualifier(loc, state, qual_stream)) {
3762 var->data.stream = qual_stream;
3763 }
3764 }
3765
3766 if (qual->flags.q.out && qual->flags.q.xfb_buffer) {
3767 unsigned qual_xfb_buffer;
3768 if (process_qualifier_constant(state, loc, "xfb_buffer",
3769 qual->xfb_buffer, &qual_xfb_buffer) &&
3770 validate_xfb_buffer_qualifier(loc, state, qual_xfb_buffer)) {
3771 var->data.xfb_buffer = qual_xfb_buffer;
3772 if (qual->flags.q.explicit_xfb_buffer)
3773 var->data.explicit_xfb_buffer = true;
3774 }
3775 }
3776
3777 if (qual->flags.q.explicit_xfb_offset) {
3778 unsigned qual_xfb_offset;
3779 unsigned component_size = var->type->contains_double() ? 8 : 4;
3780
3781 if (process_qualifier_constant(state, loc, "xfb_offset",
3782 qual->offset, &qual_xfb_offset) &&
3783 validate_xfb_offset_qualifier(loc, state, (int) qual_xfb_offset,
3784 var->type, component_size)) {
3785 var->data.offset = qual_xfb_offset;
3786 var->data.explicit_xfb_offset = true;
3787 }
3788 }
3789
3790 if (qual->flags.q.explicit_xfb_stride) {
3791 unsigned qual_xfb_stride;
3792 if (process_qualifier_constant(state, loc, "xfb_stride",
3793 qual->xfb_stride, &qual_xfb_stride)) {
3794 var->data.xfb_stride = qual_xfb_stride;
3795 var->data.explicit_xfb_stride = true;
3796 }
3797 }
3798
3799 if (var->type->contains_atomic()) {
3800 if (var->data.mode == ir_var_uniform) {
3801 if (var->data.explicit_binding) {
3802 unsigned *offset =
3803 &state->atomic_counter_offsets[var->data.binding];
3804
3805 if (*offset % ATOMIC_COUNTER_SIZE)
3806 _mesa_glsl_error(loc, state,
3807 "misaligned atomic counter offset");
3808
3809 var->data.offset = *offset;
3810 *offset += var->type->atomic_size();
3811
3812 } else {
3813 _mesa_glsl_error(loc, state,
3814 "atomic counters require explicit binding point");
3815 }
3816 } else if (var->data.mode != ir_var_function_in) {
3817 _mesa_glsl_error(loc, state, "atomic counters may only be declared as "
3818 "function parameters or uniform-qualified "
3819 "global variables");
3820 }
3821 }
3822
3823 if (var->type->contains_sampler() &&
3824 !validate_storage_for_sampler_image_types(var, state, loc))
3825 return;
3826
3827 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3828 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3829 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3830 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3831 * These extensions and all following extensions that add the 'layout'
3832 * keyword have been modified to require the use of 'in' or 'out'.
3833 *
3834 * The following extension do not allow the deprecated keywords:
3835 *
3836 * GL_AMD_conservative_depth
3837 * GL_ARB_conservative_depth
3838 * GL_ARB_gpu_shader5
3839 * GL_ARB_separate_shader_objects
3840 * GL_ARB_tessellation_shader
3841 * GL_ARB_transform_feedback3
3842 * GL_ARB_uniform_buffer_object
3843 *
3844 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3845 * allow layout with the deprecated keywords.
3846 */
3847 const bool relaxed_layout_qualifier_checking =
3848 state->ARB_fragment_coord_conventions_enable;
3849
3850 const bool uses_deprecated_qualifier = qual->flags.q.attribute
3851 || qual->flags.q.varying;
3852 if (qual->has_layout() && uses_deprecated_qualifier) {
3853 if (relaxed_layout_qualifier_checking) {
3854 _mesa_glsl_warning(loc, state,
3855 "`layout' qualifier may not be used with "
3856 "`attribute' or `varying'");
3857 } else {
3858 _mesa_glsl_error(loc, state,
3859 "`layout' qualifier may not be used with "
3860 "`attribute' or `varying'");
3861 }
3862 }
3863
3864 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3865 * AMD_conservative_depth.
3866 */
3867 if (qual->flags.q.depth_type
3868 && !state->is_version(420, 0)
3869 && !state->AMD_conservative_depth_enable
3870 && !state->ARB_conservative_depth_enable) {
3871 _mesa_glsl_error(loc, state,
3872 "extension GL_AMD_conservative_depth or "
3873 "GL_ARB_conservative_depth must be enabled "
3874 "to use depth layout qualifiers");
3875 } else if (qual->flags.q.depth_type
3876 && strcmp(var->name, "gl_FragDepth") != 0) {
3877 _mesa_glsl_error(loc, state,
3878 "depth layout qualifiers can be applied only to "
3879 "gl_FragDepth");
3880 }
3881
3882 switch (qual->depth_type) {
3883 case ast_depth_any:
3884 var->data.depth_layout = ir_depth_layout_any;
3885 break;
3886 case ast_depth_greater:
3887 var->data.depth_layout = ir_depth_layout_greater;
3888 break;
3889 case ast_depth_less:
3890 var->data.depth_layout = ir_depth_layout_less;
3891 break;
3892 case ast_depth_unchanged:
3893 var->data.depth_layout = ir_depth_layout_unchanged;
3894 break;
3895 default:
3896 var->data.depth_layout = ir_depth_layout_none;
3897 break;
3898 }
3899
3900 if (qual->flags.q.std140 ||
3901 qual->flags.q.std430 ||
3902 qual->flags.q.packed ||
3903 qual->flags.q.shared) {
3904 _mesa_glsl_error(loc, state,
3905 "uniform and shader storage block layout qualifiers "
3906 "std140, std430, packed, and shared can only be "
3907 "applied to uniform or shader storage blocks, not "
3908 "members");
3909 }
3910
3911 if (qual->flags.q.row_major || qual->flags.q.column_major) {
3912 validate_matrix_layout_for_type(state, loc, var->type, var);
3913 }
3914
3915 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3916 * Inputs):
3917 *
3918 * "Fragment shaders also allow the following layout qualifier on in only
3919 * (not with variable declarations)
3920 * layout-qualifier-id
3921 * early_fragment_tests
3922 * [...]"
3923 */
3924 if (qual->flags.q.early_fragment_tests) {
3925 _mesa_glsl_error(loc, state, "early_fragment_tests layout qualifier only "
3926 "valid in fragment shader input layout declaration.");
3927 }
3928
3929 if (qual->flags.q.inner_coverage) {
3930 _mesa_glsl_error(loc, state, "inner_coverage layout qualifier only "
3931 "valid in fragment shader input layout declaration.");
3932 }
3933
3934 if (qual->flags.q.post_depth_coverage) {
3935 _mesa_glsl_error(loc, state, "post_depth_coverage layout qualifier only "
3936 "valid in fragment shader input layout declaration.");
3937 }
3938
3939 if (state->has_bindless())
3940 apply_bindless_qualifier_to_variable(qual, var, state, loc);
3941
3942 if (qual->flags.q.pixel_interlock_ordered ||
3943 qual->flags.q.pixel_interlock_unordered ||
3944 qual->flags.q.sample_interlock_ordered ||
3945 qual->flags.q.sample_interlock_unordered) {
3946 _mesa_glsl_error(loc, state, "interlock layout qualifiers: "
3947 "pixel_interlock_ordered, pixel_interlock_unordered, "
3948 "sample_interlock_ordered and sample_interlock_unordered, "
3949 "only valid in fragment shader input layout declaration.");
3950 }
3951 }
3952
3953 static void
apply_type_qualifier_to_variable(const struct ast_type_qualifier * qual,ir_variable * var,struct _mesa_glsl_parse_state * state,YYLTYPE * loc,bool is_parameter)3954 apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
3955 ir_variable *var,
3956 struct _mesa_glsl_parse_state *state,
3957 YYLTYPE *loc,
3958 bool is_parameter)
3959 {
3960 STATIC_ASSERT(sizeof(qual->flags.q) <= sizeof(qual->flags.i));
3961
3962 if (qual->flags.q.invariant) {
3963 if (var->data.used) {
3964 _mesa_glsl_error(loc, state,
3965 "variable `%s' may not be redeclared "
3966 "`invariant' after being used",
3967 var->name);
3968 } else {
3969 var->data.explicit_invariant = true;
3970 var->data.invariant = true;
3971 }
3972 }
3973
3974 if (qual->flags.q.precise) {
3975 if (var->data.used) {
3976 _mesa_glsl_error(loc, state,
3977 "variable `%s' may not be redeclared "
3978 "`precise' after being used",
3979 var->name);
3980 } else {
3981 var->data.precise = 1;
3982 }
3983 }
3984
3985 if (qual->is_subroutine_decl() && !qual->flags.q.uniform) {
3986 _mesa_glsl_error(loc, state,
3987 "`subroutine' may only be applied to uniforms, "
3988 "subroutine type declarations, or function definitions");
3989 }
3990
3991 if (qual->flags.q.constant || qual->flags.q.attribute
3992 || qual->flags.q.uniform
3993 || (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT)))
3994 var->data.read_only = 1;
3995
3996 if (qual->flags.q.centroid)
3997 var->data.centroid = 1;
3998
3999 if (qual->flags.q.sample)
4000 var->data.sample = 1;
4001
4002 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
4003 if (state->es_shader) {
4004 var->data.precision =
4005 select_gles_precision(qual->precision, var->type, state, loc);
4006 }
4007
4008 if (qual->flags.q.patch)
4009 var->data.patch = 1;
4010
4011 if (qual->flags.q.attribute && state->stage != MESA_SHADER_VERTEX) {
4012 var->type = glsl_type::error_type;
4013 _mesa_glsl_error(loc, state,
4014 "`attribute' variables may not be declared in the "
4015 "%s shader",
4016 _mesa_shader_stage_to_string(state->stage));
4017 }
4018
4019 /* Disallow layout qualifiers which may only appear on layout declarations. */
4020 if (qual->flags.q.prim_type) {
4021 _mesa_glsl_error(loc, state,
4022 "Primitive type may only be specified on GS input or output "
4023 "layout declaration, not on variables.");
4024 }
4025
4026 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
4027 *
4028 * "However, the const qualifier cannot be used with out or inout."
4029 *
4030 * The same section of the GLSL 4.40 spec further clarifies this saying:
4031 *
4032 * "The const qualifier cannot be used with out or inout, or a
4033 * compile-time error results."
4034 */
4035 if (is_parameter && qual->flags.q.constant && qual->flags.q.out) {
4036 _mesa_glsl_error(loc, state,
4037 "`const' may not be applied to `out' or `inout' "
4038 "function parameters");
4039 }
4040
4041 /* If there is no qualifier that changes the mode of the variable, leave
4042 * the setting alone.
4043 */
4044 assert(var->data.mode != ir_var_temporary);
4045 if (qual->flags.q.in && qual->flags.q.out)
4046 var->data.mode = is_parameter ? ir_var_function_inout : ir_var_shader_out;
4047 else if (qual->flags.q.in)
4048 var->data.mode = is_parameter ? ir_var_function_in : ir_var_shader_in;
4049 else if (qual->flags.q.attribute
4050 || (qual->flags.q.varying && (state->stage == MESA_SHADER_FRAGMENT)))
4051 var->data.mode = ir_var_shader_in;
4052 else if (qual->flags.q.out)
4053 var->data.mode = is_parameter ? ir_var_function_out : ir_var_shader_out;
4054 else if (qual->flags.q.varying && (state->stage == MESA_SHADER_VERTEX))
4055 var->data.mode = ir_var_shader_out;
4056 else if (qual->flags.q.uniform)
4057 var->data.mode = ir_var_uniform;
4058 else if (qual->flags.q.buffer)
4059 var->data.mode = ir_var_shader_storage;
4060 else if (qual->flags.q.shared_storage)
4061 var->data.mode = ir_var_shader_shared;
4062
4063 if (!is_parameter && state->has_framebuffer_fetch() &&
4064 state->stage == MESA_SHADER_FRAGMENT) {
4065 if (state->is_version(130, 300))
4066 var->data.fb_fetch_output = qual->flags.q.in && qual->flags.q.out;
4067 else
4068 var->data.fb_fetch_output = (strcmp(var->name, "gl_LastFragData") == 0);
4069 }
4070
4071 if (var->data.fb_fetch_output) {
4072 var->data.assigned = true;
4073 var->data.memory_coherent = !qual->flags.q.non_coherent;
4074
4075 /* From the EXT_shader_framebuffer_fetch spec:
4076 *
4077 * "It is an error to declare an inout fragment output not qualified
4078 * with layout(noncoherent) if the GL_EXT_shader_framebuffer_fetch
4079 * extension hasn't been enabled."
4080 */
4081 if (var->data.memory_coherent &&
4082 !state->EXT_shader_framebuffer_fetch_enable)
4083 _mesa_glsl_error(loc, state,
4084 "invalid declaration of framebuffer fetch output not "
4085 "qualified with layout(noncoherent)");
4086
4087 } else {
4088 /* From the EXT_shader_framebuffer_fetch spec:
4089 *
4090 * "Fragment outputs declared inout may specify the following layout
4091 * qualifier: [...] noncoherent"
4092 */
4093 if (qual->flags.q.non_coherent)
4094 _mesa_glsl_error(loc, state,
4095 "invalid layout(noncoherent) qualifier not part of "
4096 "framebuffer fetch output declaration");
4097 }
4098
4099 if (!is_parameter && is_varying_var(var, state->stage)) {
4100 /* User-defined ins/outs are not permitted in compute shaders. */
4101 if (state->stage == MESA_SHADER_COMPUTE) {
4102 _mesa_glsl_error(loc, state,
4103 "user-defined input and output variables are not "
4104 "permitted in compute shaders");
4105 }
4106
4107 /* This variable is being used to link data between shader stages (in
4108 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4109 * that is allowed for such purposes.
4110 *
4111 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4112 *
4113 * "The varying qualifier can be used only with the data types
4114 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4115 * these."
4116 *
4117 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4118 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4119 *
4120 * "Fragment inputs can only be signed and unsigned integers and
4121 * integer vectors, float, floating-point vectors, matrices, or
4122 * arrays of these. Structures cannot be input.
4123 *
4124 * Similar text exists in the section on vertex shader outputs.
4125 *
4126 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4127 * 3.00 spec allows structs as well. Varying structs are also allowed
4128 * in GLSL 1.50.
4129 *
4130 * From section 4.3.4 of the ARB_bindless_texture spec:
4131 *
4132 * "(modify third paragraph of the section to allow sampler and image
4133 * types) ... Vertex shader inputs can only be float,
4134 * single-precision floating-point scalars, single-precision
4135 * floating-point vectors, matrices, signed and unsigned integers
4136 * and integer vectors, sampler and image types."
4137 *
4138 * From section 4.3.6 of the ARB_bindless_texture spec:
4139 *
4140 * "Output variables can only be floating-point scalars,
4141 * floating-point vectors, matrices, signed or unsigned integers or
4142 * integer vectors, sampler or image types, or arrays or structures
4143 * of any these."
4144 */
4145 switch (var->type->without_array()->base_type) {
4146 case GLSL_TYPE_FLOAT:
4147 /* Ok in all GLSL versions */
4148 break;
4149 case GLSL_TYPE_UINT:
4150 case GLSL_TYPE_INT:
4151 if (state->is_version(130, 300) || state->EXT_gpu_shader4_enable)
4152 break;
4153 _mesa_glsl_error(loc, state,
4154 "varying variables must be of base type float in %s",
4155 state->get_version_string());
4156 break;
4157 case GLSL_TYPE_STRUCT:
4158 if (state->is_version(150, 300))
4159 break;
4160 _mesa_glsl_error(loc, state,
4161 "varying variables may not be of type struct");
4162 break;
4163 case GLSL_TYPE_DOUBLE:
4164 case GLSL_TYPE_UINT64:
4165 case GLSL_TYPE_INT64:
4166 break;
4167 case GLSL_TYPE_SAMPLER:
4168 case GLSL_TYPE_IMAGE:
4169 if (state->has_bindless())
4170 break;
4171 /* fallthrough */
4172 default:
4173 _mesa_glsl_error(loc, state, "illegal type for a varying variable");
4174 break;
4175 }
4176 }
4177
4178 if (state->all_invariant && var->data.mode == ir_var_shader_out) {
4179 var->data.explicit_invariant = true;
4180 var->data.invariant = true;
4181 }
4182
4183 var->data.interpolation =
4184 interpret_interpolation_qualifier(qual, var->type,
4185 (ir_variable_mode) var->data.mode,
4186 state, loc);
4187
4188 /* Does the declaration use the deprecated 'attribute' or 'varying'
4189 * keywords?
4190 */
4191 const bool uses_deprecated_qualifier = qual->flags.q.attribute
4192 || qual->flags.q.varying;
4193
4194
4195 /* Validate auxiliary storage qualifiers */
4196
4197 /* From section 4.3.4 of the GLSL 1.30 spec:
4198 * "It is an error to use centroid in in a vertex shader."
4199 *
4200 * From section 4.3.4 of the GLSL ES 3.00 spec:
4201 * "It is an error to use centroid in or interpolation qualifiers in
4202 * a vertex shader input."
4203 */
4204
4205 /* Section 4.3.6 of the GLSL 1.30 specification states:
4206 * "It is an error to use centroid out in a fragment shader."
4207 *
4208 * The GL_ARB_shading_language_420pack extension specification states:
4209 * "It is an error to use auxiliary storage qualifiers or interpolation
4210 * qualifiers on an output in a fragment shader."
4211 */
4212 if (qual->flags.q.sample && (!is_varying_var(var, state->stage) || uses_deprecated_qualifier)) {
4213 _mesa_glsl_error(loc, state,
4214 "sample qualifier may only be used on `in` or `out` "
4215 "variables between shader stages");
4216 }
4217 if (qual->flags.q.centroid && !is_varying_var(var, state->stage)) {
4218 _mesa_glsl_error(loc, state,
4219 "centroid qualifier may only be used with `in', "
4220 "`out' or `varying' variables between shader stages");
4221 }
4222
4223 if (qual->flags.q.shared_storage && state->stage != MESA_SHADER_COMPUTE) {
4224 _mesa_glsl_error(loc, state,
4225 "the shared storage qualifiers can only be used with "
4226 "compute shaders");
4227 }
4228
4229 apply_image_qualifier_to_variable(qual, var, state, loc);
4230 }
4231
4232 /**
4233 * Get the variable that is being redeclared by this declaration or if it
4234 * does not exist, the current declared variable.
4235 *
4236 * Semantic checks to verify the validity of the redeclaration are also
4237 * performed. If semantic checks fail, compilation error will be emitted via
4238 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4239 *
4240 * \returns
4241 * A pointer to an existing variable in the current scope if the declaration
4242 * is a redeclaration, current variable otherwise. \c is_declared boolean
4243 * will return \c true if the declaration is a redeclaration, \c false
4244 * otherwise.
4245 */
4246 static ir_variable *
get_variable_being_redeclared(ir_variable ** var_ptr,YYLTYPE loc,struct _mesa_glsl_parse_state * state,bool allow_all_redeclarations,bool * is_redeclaration)4247 get_variable_being_redeclared(ir_variable **var_ptr, YYLTYPE loc,
4248 struct _mesa_glsl_parse_state *state,
4249 bool allow_all_redeclarations,
4250 bool *is_redeclaration)
4251 {
4252 ir_variable *var = *var_ptr;
4253
4254 /* Check if this declaration is actually a re-declaration, either to
4255 * resize an array or add qualifiers to an existing variable.
4256 *
4257 * This is allowed for variables in the current scope, or when at
4258 * global scope (for built-ins in the implicit outer scope).
4259 */
4260 ir_variable *earlier = state->symbols->get_variable(var->name);
4261 if (earlier == NULL ||
4262 (state->current_function != NULL &&
4263 !state->symbols->name_declared_this_scope(var->name))) {
4264 *is_redeclaration = false;
4265 return var;
4266 }
4267
4268 *is_redeclaration = true;
4269
4270 if (earlier->data.how_declared == ir_var_declared_implicitly) {
4271 /* Verify that the redeclaration of a built-in does not change the
4272 * storage qualifier. There are a couple special cases.
4273 *
4274 * 1. Some built-in variables that are defined as 'in' in the
4275 * specification are implemented as system values. Allow
4276 * ir_var_system_value -> ir_var_shader_in.
4277 *
4278 * 2. gl_LastFragData is implemented as a ir_var_shader_out, but the
4279 * specification requires that redeclarations omit any qualifier.
4280 * Allow ir_var_shader_out -> ir_var_auto for this one variable.
4281 */
4282 if (earlier->data.mode != var->data.mode &&
4283 !(earlier->data.mode == ir_var_system_value &&
4284 var->data.mode == ir_var_shader_in) &&
4285 !(strcmp(var->name, "gl_LastFragData") == 0 &&
4286 var->data.mode == ir_var_auto)) {
4287 _mesa_glsl_error(&loc, state,
4288 "redeclaration cannot change qualification of `%s'",
4289 var->name);
4290 }
4291 }
4292
4293 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4294 *
4295 * "It is legal to declare an array without a size and then
4296 * later re-declare the same name as an array of the same
4297 * type and specify a size."
4298 */
4299 if (earlier->type->is_unsized_array() && var->type->is_array()
4300 && (var->type->fields.array == earlier->type->fields.array)) {
4301 const int size = var->type->array_size();
4302 check_builtin_array_max_size(var->name, size, loc, state);
4303 if ((size > 0) && (size <= earlier->data.max_array_access)) {
4304 _mesa_glsl_error(& loc, state, "array size must be > %u due to "
4305 "previous access",
4306 earlier->data.max_array_access);
4307 }
4308
4309 earlier->type = var->type;
4310 delete var;
4311 var = NULL;
4312 *var_ptr = NULL;
4313 } else if (earlier->type != var->type) {
4314 _mesa_glsl_error(&loc, state,
4315 "redeclaration of `%s' has incorrect type",
4316 var->name);
4317 } else if ((state->ARB_fragment_coord_conventions_enable ||
4318 state->is_version(150, 0))
4319 && strcmp(var->name, "gl_FragCoord") == 0) {
4320 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4321 * qualifiers.
4322 *
4323 * We don't really need to do anything here, just allow the
4324 * redeclaration. Any error on the gl_FragCoord is handled on the ast
4325 * level at apply_layout_qualifier_to_variable using the
4326 * ast_type_qualifier and _mesa_glsl_parse_state, or later at
4327 * linker.cpp.
4328 */
4329 /* According to section 4.3.7 of the GLSL 1.30 spec,
4330 * the following built-in varaibles can be redeclared with an
4331 * interpolation qualifier:
4332 * * gl_FrontColor
4333 * * gl_BackColor
4334 * * gl_FrontSecondaryColor
4335 * * gl_BackSecondaryColor
4336 * * gl_Color
4337 * * gl_SecondaryColor
4338 */
4339 } else if (state->is_version(130, 0)
4340 && (strcmp(var->name, "gl_FrontColor") == 0
4341 || strcmp(var->name, "gl_BackColor") == 0
4342 || strcmp(var->name, "gl_FrontSecondaryColor") == 0
4343 || strcmp(var->name, "gl_BackSecondaryColor") == 0
4344 || strcmp(var->name, "gl_Color") == 0
4345 || strcmp(var->name, "gl_SecondaryColor") == 0)) {
4346 earlier->data.interpolation = var->data.interpolation;
4347
4348 /* Layout qualifiers for gl_FragDepth. */
4349 } else if ((state->is_version(420, 0) ||
4350 state->AMD_conservative_depth_enable ||
4351 state->ARB_conservative_depth_enable)
4352 && strcmp(var->name, "gl_FragDepth") == 0) {
4353
4354 /** From the AMD_conservative_depth spec:
4355 * Within any shader, the first redeclarations of gl_FragDepth
4356 * must appear before any use of gl_FragDepth.
4357 */
4358 if (earlier->data.used) {
4359 _mesa_glsl_error(&loc, state,
4360 "the first redeclaration of gl_FragDepth "
4361 "must appear before any use of gl_FragDepth");
4362 }
4363
4364 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4365 if (earlier->data.depth_layout != ir_depth_layout_none
4366 && earlier->data.depth_layout != var->data.depth_layout) {
4367 _mesa_glsl_error(&loc, state,
4368 "gl_FragDepth: depth layout is declared here "
4369 "as '%s, but it was previously declared as "
4370 "'%s'",
4371 depth_layout_string(var->data.depth_layout),
4372 depth_layout_string(earlier->data.depth_layout));
4373 }
4374
4375 earlier->data.depth_layout = var->data.depth_layout;
4376
4377 } else if (state->has_framebuffer_fetch() &&
4378 strcmp(var->name, "gl_LastFragData") == 0 &&
4379 var->data.mode == ir_var_auto) {
4380 /* According to the EXT_shader_framebuffer_fetch spec:
4381 *
4382 * "By default, gl_LastFragData is declared with the mediump precision
4383 * qualifier. This can be changed by redeclaring the corresponding
4384 * variables with the desired precision qualifier."
4385 *
4386 * "Fragment shaders may specify the following layout qualifier only for
4387 * redeclaring the built-in gl_LastFragData array [...]: noncoherent"
4388 */
4389 earlier->data.precision = var->data.precision;
4390 earlier->data.memory_coherent = var->data.memory_coherent;
4391
4392 } else if ((earlier->data.how_declared == ir_var_declared_implicitly &&
4393 state->allow_builtin_variable_redeclaration) ||
4394 allow_all_redeclarations) {
4395 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4396 * valid, but some applications do it.
4397 */
4398 } else {
4399 _mesa_glsl_error(&loc, state, "`%s' redeclared", var->name);
4400 }
4401
4402 return earlier;
4403 }
4404
4405 /**
4406 * Generate the IR for an initializer in a variable declaration
4407 */
4408 static ir_rvalue *
process_initializer(ir_variable * var,ast_declaration * decl,ast_fully_specified_type * type,exec_list * initializer_instructions,struct _mesa_glsl_parse_state * state)4409 process_initializer(ir_variable *var, ast_declaration *decl,
4410 ast_fully_specified_type *type,
4411 exec_list *initializer_instructions,
4412 struct _mesa_glsl_parse_state *state)
4413 {
4414 void *mem_ctx = state;
4415 ir_rvalue *result = NULL;
4416
4417 YYLTYPE initializer_loc = decl->initializer->get_location();
4418
4419 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4420 *
4421 * "All uniform variables are read-only and are initialized either
4422 * directly by an application via API commands, or indirectly by
4423 * OpenGL."
4424 */
4425 if (var->data.mode == ir_var_uniform) {
4426 state->check_version(120, 0, &initializer_loc,
4427 "cannot initialize uniform %s",
4428 var->name);
4429 }
4430
4431 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4432 *
4433 * "Buffer variables cannot have initializers."
4434 */
4435 if (var->data.mode == ir_var_shader_storage) {
4436 _mesa_glsl_error(&initializer_loc, state,
4437 "cannot initialize buffer variable %s",
4438 var->name);
4439 }
4440
4441 /* From section 4.1.7 of the GLSL 4.40 spec:
4442 *
4443 * "Opaque variables [...] are initialized only through the
4444 * OpenGL API; they cannot be declared with an initializer in a
4445 * shader."
4446 *
4447 * From section 4.1.7 of the ARB_bindless_texture spec:
4448 *
4449 * "Samplers may be declared as shader inputs and outputs, as uniform
4450 * variables, as temporary variables, and as function parameters."
4451 *
4452 * From section 4.1.X of the ARB_bindless_texture spec:
4453 *
4454 * "Images may be declared as shader inputs and outputs, as uniform
4455 * variables, as temporary variables, and as function parameters."
4456 */
4457 if (var->type->contains_atomic() ||
4458 (!state->has_bindless() && var->type->contains_opaque())) {
4459 _mesa_glsl_error(&initializer_loc, state,
4460 "cannot initialize %s variable %s",
4461 var->name, state->has_bindless() ? "atomic" : "opaque");
4462 }
4463
4464 if ((var->data.mode == ir_var_shader_in) && (state->current_function == NULL)) {
4465 _mesa_glsl_error(&initializer_loc, state,
4466 "cannot initialize %s shader input / %s %s",
4467 _mesa_shader_stage_to_string(state->stage),
4468 (state->stage == MESA_SHADER_VERTEX)
4469 ? "attribute" : "varying",
4470 var->name);
4471 }
4472
4473 if (var->data.mode == ir_var_shader_out && state->current_function == NULL) {
4474 _mesa_glsl_error(&initializer_loc, state,
4475 "cannot initialize %s shader output %s",
4476 _mesa_shader_stage_to_string(state->stage),
4477 var->name);
4478 }
4479
4480 /* If the initializer is an ast_aggregate_initializer, recursively store
4481 * type information from the LHS into it, so that its hir() function can do
4482 * type checking.
4483 */
4484 if (decl->initializer->oper == ast_aggregate)
4485 _mesa_ast_set_aggregate_type(var->type, decl->initializer);
4486
4487 ir_dereference *const lhs = new(state) ir_dereference_variable(var);
4488 ir_rvalue *rhs = decl->initializer->hir(initializer_instructions, state);
4489
4490 /* Calculate the constant value if this is a const or uniform
4491 * declaration.
4492 *
4493 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4494 *
4495 * "Declarations of globals without a storage qualifier, or with
4496 * just the const qualifier, may include initializers, in which case
4497 * they will be initialized before the first line of main() is
4498 * executed. Such initializers must be a constant expression."
4499 *
4500 * The same section of the GLSL ES 3.00.4 spec has similar language.
4501 */
4502 if (type->qualifier.flags.q.constant
4503 || type->qualifier.flags.q.uniform
4504 || (state->es_shader && state->current_function == NULL)) {
4505 ir_rvalue *new_rhs = validate_assignment(state, initializer_loc,
4506 lhs, rhs, true);
4507 if (new_rhs != NULL) {
4508 rhs = new_rhs;
4509
4510 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4511 * says:
4512 *
4513 * "A constant expression is one of
4514 *
4515 * ...
4516 *
4517 * - an expression formed by an operator on operands that are
4518 * all constant expressions, including getting an element of
4519 * a constant array, or a field of a constant structure, or
4520 * components of a constant vector. However, the sequence
4521 * operator ( , ) and the assignment operators ( =, +=, ...)
4522 * are not included in the operators that can create a
4523 * constant expression."
4524 *
4525 * Section 12.43 (Sequence operator and constant expressions) says:
4526 *
4527 * "Should the following construct be allowed?
4528 *
4529 * float a[2,3];
4530 *
4531 * The expression within the brackets uses the sequence operator
4532 * (',') and returns the integer 3 so the construct is declaring
4533 * a single-dimensional array of size 3. In some languages, the
4534 * construct declares a two-dimensional array. It would be
4535 * preferable to make this construct illegal to avoid confusion.
4536 *
4537 * One possibility is to change the definition of the sequence
4538 * operator so that it does not return a constant-expression and
4539 * hence cannot be used to declare an array size.
4540 *
4541 * RESOLUTION: The result of a sequence operator is not a
4542 * constant-expression."
4543 *
4544 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4545 * contains language almost identical to the section 4.3.3 in the
4546 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4547 * versions.
4548 */
4549 ir_constant *constant_value =
4550 rhs->constant_expression_value(mem_ctx);
4551
4552 if (!constant_value ||
4553 (state->is_version(430, 300) &&
4554 decl->initializer->has_sequence_subexpression())) {
4555 const char *const variable_mode =
4556 (type->qualifier.flags.q.constant)
4557 ? "const"
4558 : ((type->qualifier.flags.q.uniform) ? "uniform" : "global");
4559
4560 /* If ARB_shading_language_420pack is enabled, initializers of
4561 * const-qualified local variables do not have to be constant
4562 * expressions. Const-qualified global variables must still be
4563 * initialized with constant expressions.
4564 */
4565 if (!state->has_420pack()
4566 || state->current_function == NULL) {
4567 _mesa_glsl_error(& initializer_loc, state,
4568 "initializer of %s variable `%s' must be a "
4569 "constant expression",
4570 variable_mode,
4571 decl->identifier);
4572 if (var->type->is_numeric()) {
4573 /* Reduce cascading errors. */
4574 var->constant_value = type->qualifier.flags.q.constant
4575 ? ir_constant::zero(state, var->type) : NULL;
4576 }
4577 }
4578 } else {
4579 rhs = constant_value;
4580 var->constant_value = type->qualifier.flags.q.constant
4581 ? constant_value : NULL;
4582 }
4583 } else {
4584 if (var->type->is_numeric()) {
4585 /* Reduce cascading errors. */
4586 rhs = var->constant_value = type->qualifier.flags.q.constant
4587 ? ir_constant::zero(state, var->type) : NULL;
4588 }
4589 }
4590 }
4591
4592 if (rhs && !rhs->type->is_error()) {
4593 bool temp = var->data.read_only;
4594 if (type->qualifier.flags.q.constant)
4595 var->data.read_only = false;
4596
4597 /* Never emit code to initialize a uniform.
4598 */
4599 const glsl_type *initializer_type;
4600 bool error_emitted = false;
4601 if (!type->qualifier.flags.q.uniform) {
4602 error_emitted =
4603 do_assignment(initializer_instructions, state,
4604 NULL, lhs, rhs,
4605 &result, true, true,
4606 type->get_location());
4607 initializer_type = result->type;
4608 } else
4609 initializer_type = rhs->type;
4610
4611 if (!error_emitted) {
4612 var->constant_initializer = rhs->constant_expression_value(mem_ctx);
4613 var->data.has_initializer = true;
4614
4615 /* If the declared variable is an unsized array, it must inherrit
4616 * its full type from the initializer. A declaration such as
4617 *
4618 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4619 *
4620 * becomes
4621 *
4622 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4623 *
4624 * The assignment generated in the if-statement (below) will also
4625 * automatically handle this case for non-uniforms.
4626 *
4627 * If the declared variable is not an array, the types must
4628 * already match exactly. As a result, the type assignment
4629 * here can be done unconditionally. For non-uniforms the call
4630 * to do_assignment can change the type of the initializer (via
4631 * the implicit conversion rules). For uniforms the initializer
4632 * must be a constant expression, and the type of that expression
4633 * was validated above.
4634 */
4635 var->type = initializer_type;
4636 }
4637
4638 var->data.read_only = temp;
4639 }
4640
4641 return result;
4642 }
4643
4644 static void
validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state * state,YYLTYPE loc,ir_variable * var,unsigned num_vertices,unsigned * size,const char * var_category)4645 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state *state,
4646 YYLTYPE loc, ir_variable *var,
4647 unsigned num_vertices,
4648 unsigned *size,
4649 const char *var_category)
4650 {
4651 if (var->type->is_unsized_array()) {
4652 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4653 *
4654 * All geometry shader input unsized array declarations will be
4655 * sized by an earlier input layout qualifier, when present, as per
4656 * the following table.
4657 *
4658 * Followed by a table mapping each allowed input layout qualifier to
4659 * the corresponding input length.
4660 *
4661 * Similarly for tessellation control shader outputs.
4662 */
4663 if (num_vertices != 0)
4664 var->type = glsl_type::get_array_instance(var->type->fields.array,
4665 num_vertices);
4666 } else {
4667 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4668 * includes the following examples of compile-time errors:
4669 *
4670 * // code sequence within one shader...
4671 * in vec4 Color1[]; // size unknown
4672 * ...Color1.length()...// illegal, length() unknown
4673 * in vec4 Color2[2]; // size is 2
4674 * ...Color1.length()...// illegal, Color1 still has no size
4675 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4676 * layout(lines) in; // legal, input size is 2, matching
4677 * in vec4 Color4[3]; // illegal, contradicts layout
4678 * ...
4679 *
4680 * To detect the case illustrated by Color3, we verify that the size of
4681 * an explicitly-sized array matches the size of any previously declared
4682 * explicitly-sized array. To detect the case illustrated by Color4, we
4683 * verify that the size of an explicitly-sized array is consistent with
4684 * any previously declared input layout.
4685 */
4686 if (num_vertices != 0 && var->type->length != num_vertices) {
4687 _mesa_glsl_error(&loc, state,
4688 "%s size contradicts previously declared layout "
4689 "(size is %u, but layout requires a size of %u)",
4690 var_category, var->type->length, num_vertices);
4691 } else if (*size != 0 && var->type->length != *size) {
4692 _mesa_glsl_error(&loc, state,
4693 "%s sizes are inconsistent (size is %u, but a "
4694 "previous declaration has size %u)",
4695 var_category, var->type->length, *size);
4696 } else {
4697 *size = var->type->length;
4698 }
4699 }
4700 }
4701
4702 static void
handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state * state,YYLTYPE loc,ir_variable * var)4703 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state *state,
4704 YYLTYPE loc, ir_variable *var)
4705 {
4706 unsigned num_vertices = 0;
4707
4708 if (state->tcs_output_vertices_specified) {
4709 if (!state->out_qualifier->vertices->
4710 process_qualifier_constant(state, "vertices",
4711 &num_vertices, false)) {
4712 return;
4713 }
4714
4715 if (num_vertices > state->Const.MaxPatchVertices) {
4716 _mesa_glsl_error(&loc, state, "vertices (%d) exceeds "
4717 "GL_MAX_PATCH_VERTICES", num_vertices);
4718 return;
4719 }
4720 }
4721
4722 if (!var->type->is_array() && !var->data.patch) {
4723 _mesa_glsl_error(&loc, state,
4724 "tessellation control shader outputs must be arrays");
4725
4726 /* To avoid cascading failures, short circuit the checks below. */
4727 return;
4728 }
4729
4730 if (var->data.patch)
4731 return;
4732
4733 validate_layout_qualifier_vertex_count(state, loc, var, num_vertices,
4734 &state->tcs_output_size,
4735 "tessellation control shader output");
4736 }
4737
4738 /**
4739 * Do additional processing necessary for tessellation control/evaluation shader
4740 * input declarations. This covers both interface block arrays and bare input
4741 * variables.
4742 */
4743 static void
handle_tess_shader_input_decl(struct _mesa_glsl_parse_state * state,YYLTYPE loc,ir_variable * var)4744 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state *state,
4745 YYLTYPE loc, ir_variable *var)
4746 {
4747 if (!var->type->is_array() && !var->data.patch) {
4748 _mesa_glsl_error(&loc, state,
4749 "per-vertex tessellation shader inputs must be arrays");
4750 /* Avoid cascading failures. */
4751 return;
4752 }
4753
4754 if (var->data.patch)
4755 return;
4756
4757 /* The ARB_tessellation_shader spec says:
4758 *
4759 * "Declaring an array size is optional. If no size is specified, it
4760 * will be taken from the implementation-dependent maximum patch size
4761 * (gl_MaxPatchVertices). If a size is specified, it must match the
4762 * maximum patch size; otherwise, a compile or link error will occur."
4763 *
4764 * This text appears twice, once for TCS inputs, and again for TES inputs.
4765 */
4766 if (var->type->is_unsized_array()) {
4767 var->type = glsl_type::get_array_instance(var->type->fields.array,
4768 state->Const.MaxPatchVertices);
4769 } else if (var->type->length != state->Const.MaxPatchVertices) {
4770 _mesa_glsl_error(&loc, state,
4771 "per-vertex tessellation shader input arrays must be "
4772 "sized to gl_MaxPatchVertices (%d).",
4773 state->Const.MaxPatchVertices);
4774 }
4775 }
4776
4777
4778 /**
4779 * Do additional processing necessary for geometry shader input declarations
4780 * (this covers both interface blocks arrays and bare input variables).
4781 */
4782 static void
handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state * state,YYLTYPE loc,ir_variable * var)4783 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state *state,
4784 YYLTYPE loc, ir_variable *var)
4785 {
4786 unsigned num_vertices = 0;
4787
4788 if (state->gs_input_prim_type_specified) {
4789 num_vertices = vertices_per_prim(state->in_qualifier->prim_type);
4790 }
4791
4792 /* Geometry shader input variables must be arrays. Caller should have
4793 * reported an error for this.
4794 */
4795 if (!var->type->is_array()) {
4796 assert(state->error);
4797
4798 /* To avoid cascading failures, short circuit the checks below. */
4799 return;
4800 }
4801
4802 validate_layout_qualifier_vertex_count(state, loc, var, num_vertices,
4803 &state->gs_input_size,
4804 "geometry shader input");
4805 }
4806
4807 static void
validate_identifier(const char * identifier,YYLTYPE loc,struct _mesa_glsl_parse_state * state)4808 validate_identifier(const char *identifier, YYLTYPE loc,
4809 struct _mesa_glsl_parse_state *state)
4810 {
4811 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4812 *
4813 * "Identifiers starting with "gl_" are reserved for use by
4814 * OpenGL, and may not be declared in a shader as either a
4815 * variable or a function."
4816 */
4817 if (is_gl_identifier(identifier)) {
4818 _mesa_glsl_error(&loc, state,
4819 "identifier `%s' uses reserved `gl_' prefix",
4820 identifier);
4821 } else if (strstr(identifier, "__")) {
4822 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4823 * spec:
4824 *
4825 * "In addition, all identifiers containing two
4826 * consecutive underscores (__) are reserved as
4827 * possible future keywords."
4828 *
4829 * The intention is that names containing __ are reserved for internal
4830 * use by the implementation, and names prefixed with GL_ are reserved
4831 * for use by Khronos. Names simply containing __ are dangerous to use,
4832 * but should be allowed.
4833 *
4834 * A future version of the GLSL specification will clarify this.
4835 */
4836 _mesa_glsl_warning(&loc, state,
4837 "identifier `%s' uses reserved `__' string",
4838 identifier);
4839 }
4840 }
4841
4842 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)4843 ast_declarator_list::hir(exec_list *instructions,
4844 struct _mesa_glsl_parse_state *state)
4845 {
4846 void *ctx = state;
4847 const struct glsl_type *decl_type;
4848 const char *type_name = NULL;
4849 ir_rvalue *result = NULL;
4850 YYLTYPE loc = this->get_location();
4851
4852 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4853 *
4854 * "To ensure that a particular output variable is invariant, it is
4855 * necessary to use the invariant qualifier. It can either be used to
4856 * qualify a previously declared variable as being invariant
4857 *
4858 * invariant gl_Position; // make existing gl_Position be invariant"
4859 *
4860 * In these cases the parser will set the 'invariant' flag in the declarator
4861 * list, and the type will be NULL.
4862 */
4863 if (this->invariant) {
4864 assert(this->type == NULL);
4865
4866 if (state->current_function != NULL) {
4867 _mesa_glsl_error(& loc, state,
4868 "all uses of `invariant' keyword must be at global "
4869 "scope");
4870 }
4871
4872 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
4873 assert(decl->array_specifier == NULL);
4874 assert(decl->initializer == NULL);
4875
4876 ir_variable *const earlier =
4877 state->symbols->get_variable(decl->identifier);
4878 if (earlier == NULL) {
4879 _mesa_glsl_error(& loc, state,
4880 "undeclared variable `%s' cannot be marked "
4881 "invariant", decl->identifier);
4882 } else if (!is_allowed_invariant(earlier, state)) {
4883 _mesa_glsl_error(&loc, state,
4884 "`%s' cannot be marked invariant; interfaces between "
4885 "shader stages only.", decl->identifier);
4886 } else if (earlier->data.used) {
4887 _mesa_glsl_error(& loc, state,
4888 "variable `%s' may not be redeclared "
4889 "`invariant' after being used",
4890 earlier->name);
4891 } else {
4892 earlier->data.explicit_invariant = true;
4893 earlier->data.invariant = true;
4894 }
4895 }
4896
4897 /* Invariant redeclarations do not have r-values.
4898 */
4899 return NULL;
4900 }
4901
4902 if (this->precise) {
4903 assert(this->type == NULL);
4904
4905 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
4906 assert(decl->array_specifier == NULL);
4907 assert(decl->initializer == NULL);
4908
4909 ir_variable *const earlier =
4910 state->symbols->get_variable(decl->identifier);
4911 if (earlier == NULL) {
4912 _mesa_glsl_error(& loc, state,
4913 "undeclared variable `%s' cannot be marked "
4914 "precise", decl->identifier);
4915 } else if (state->current_function != NULL &&
4916 !state->symbols->name_declared_this_scope(decl->identifier)) {
4917 /* Note: we have to check if we're in a function, since
4918 * builtins are treated as having come from another scope.
4919 */
4920 _mesa_glsl_error(& loc, state,
4921 "variable `%s' from an outer scope may not be "
4922 "redeclared `precise' in this scope",
4923 earlier->name);
4924 } else if (earlier->data.used) {
4925 _mesa_glsl_error(& loc, state,
4926 "variable `%s' may not be redeclared "
4927 "`precise' after being used",
4928 earlier->name);
4929 } else {
4930 earlier->data.precise = true;
4931 }
4932 }
4933
4934 /* Precise redeclarations do not have r-values either. */
4935 return NULL;
4936 }
4937
4938 assert(this->type != NULL);
4939 assert(!this->invariant);
4940 assert(!this->precise);
4941
4942 /* GL_EXT_shader_image_load_store base type uses GLSL_TYPE_VOID as a special value to
4943 * indicate that it needs to be updated later (see glsl_parser.yy).
4944 * This is done here, based on the layout qualifier and the type of the image var
4945 */
4946 if (this->type->qualifier.flags.q.explicit_image_format &&
4947 this->type->specifier->type->is_image() &&
4948 this->type->qualifier.image_base_type == GLSL_TYPE_VOID) {
4949 /* "The ARB_shader_image_load_store says:
4950 * If both extensions are enabled in the shading language, the "size*" layout
4951 * qualifiers are treated as format qualifiers, and are mapped to equivalent
4952 * format qualifiers in the table below, according to the type of image
4953 * variable.
4954 * image* iimage* uimage*
4955 * -------- -------- --------
4956 * size1x8 n/a r8i r8ui
4957 * size1x16 r16f r16i r16ui
4958 * size1x32 r32f r32i r32ui
4959 * size2x32 rg32f rg32i rg32ui
4960 * size4x32 rgba32f rgba32i rgba32ui"
4961 */
4962 if (strncmp(this->type->specifier->type_name, "image", strlen("image")) == 0) {
4963 this->type->qualifier.image_format = GL_R8 +
4964 this->type->qualifier.image_format - GL_R8I;
4965 this->type->qualifier.image_base_type = GLSL_TYPE_FLOAT;
4966 } else if (strncmp(this->type->specifier->type_name, "uimage", strlen("uimage")) == 0) {
4967 this->type->qualifier.image_format = GL_R8UI +
4968 this->type->qualifier.image_format - GL_R8I;
4969 this->type->qualifier.image_base_type = GLSL_TYPE_UINT;
4970 } else if (strncmp(this->type->specifier->type_name, "iimage", strlen("iimage")) == 0) {
4971 this->type->qualifier.image_base_type = GLSL_TYPE_INT;
4972 } else {
4973 assert(false);
4974 }
4975 }
4976
4977 /* The type specifier may contain a structure definition. Process that
4978 * before any of the variable declarations.
4979 */
4980 (void) this->type->specifier->hir(instructions, state);
4981
4982 decl_type = this->type->glsl_type(& type_name, state);
4983
4984 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4985 * "Buffer variables may only be declared inside interface blocks
4986 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4987 * shader storage blocks. It is a compile-time error to declare buffer
4988 * variables at global scope (outside a block)."
4989 */
4990 if (type->qualifier.flags.q.buffer && !decl_type->is_interface()) {
4991 _mesa_glsl_error(&loc, state,
4992 "buffer variables cannot be declared outside "
4993 "interface blocks");
4994 }
4995
4996 /* An offset-qualified atomic counter declaration sets the default
4997 * offset for the next declaration within the same atomic counter
4998 * buffer.
4999 */
5000 if (decl_type && decl_type->contains_atomic()) {
5001 if (type->qualifier.flags.q.explicit_binding &&
5002 type->qualifier.flags.q.explicit_offset) {
5003 unsigned qual_binding;
5004 unsigned qual_offset;
5005 if (process_qualifier_constant(state, &loc, "binding",
5006 type->qualifier.binding,
5007 &qual_binding)
5008 && process_qualifier_constant(state, &loc, "offset",
5009 type->qualifier.offset,
5010 &qual_offset)) {
5011 if (qual_binding < ARRAY_SIZE(state->atomic_counter_offsets))
5012 state->atomic_counter_offsets[qual_binding] = qual_offset;
5013 }
5014 }
5015
5016 ast_type_qualifier allowed_atomic_qual_mask;
5017 allowed_atomic_qual_mask.flags.i = 0;
5018 allowed_atomic_qual_mask.flags.q.explicit_binding = 1;
5019 allowed_atomic_qual_mask.flags.q.explicit_offset = 1;
5020 allowed_atomic_qual_mask.flags.q.uniform = 1;
5021
5022 type->qualifier.validate_flags(&loc, state, allowed_atomic_qual_mask,
5023 "invalid layout qualifier for",
5024 "atomic_uint");
5025 }
5026
5027 if (this->declarations.is_empty()) {
5028 /* If there is no structure involved in the program text, there are two
5029 * possible scenarios:
5030 *
5031 * - The program text contained something like 'vec4;'. This is an
5032 * empty declaration. It is valid but weird. Emit a warning.
5033 *
5034 * - The program text contained something like 'S;' and 'S' is not the
5035 * name of a known structure type. This is both invalid and weird.
5036 * Emit an error.
5037 *
5038 * - The program text contained something like 'mediump float;'
5039 * when the programmer probably meant 'precision mediump
5040 * float;' Emit a warning with a description of what they
5041 * probably meant to do.
5042 *
5043 * Note that if decl_type is NULL and there is a structure involved,
5044 * there must have been some sort of error with the structure. In this
5045 * case we assume that an error was already generated on this line of
5046 * code for the structure. There is no need to generate an additional,
5047 * confusing error.
5048 */
5049 assert(this->type->specifier->structure == NULL || decl_type != NULL
5050 || state->error);
5051
5052 if (decl_type == NULL) {
5053 _mesa_glsl_error(&loc, state,
5054 "invalid type `%s' in empty declaration",
5055 type_name);
5056 } else {
5057 if (decl_type->is_array()) {
5058 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
5059 * spec:
5060 *
5061 * "... any declaration that leaves the size undefined is
5062 * disallowed as this would add complexity and there are no
5063 * use-cases."
5064 */
5065 if (state->es_shader && decl_type->is_unsized_array()) {
5066 _mesa_glsl_error(&loc, state, "array size must be explicitly "
5067 "or implicitly defined");
5068 }
5069
5070 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
5071 *
5072 * "The combinations of types and qualifiers that cause
5073 * compile-time or link-time errors are the same whether or not
5074 * the declaration is empty."
5075 */
5076 validate_array_dimensions(decl_type, state, &loc);
5077 }
5078
5079 if (decl_type->is_atomic_uint()) {
5080 /* Empty atomic counter declarations are allowed and useful
5081 * to set the default offset qualifier.
5082 */
5083 return NULL;
5084 } else if (this->type->qualifier.precision != ast_precision_none) {
5085 if (this->type->specifier->structure != NULL) {
5086 _mesa_glsl_error(&loc, state,
5087 "precision qualifiers can't be applied "
5088 "to structures");
5089 } else {
5090 static const char *const precision_names[] = {
5091 "highp",
5092 "highp",
5093 "mediump",
5094 "lowp"
5095 };
5096
5097 _mesa_glsl_warning(&loc, state,
5098 "empty declaration with precision "
5099 "qualifier, to set the default precision, "
5100 "use `precision %s %s;'",
5101 precision_names[this->type->
5102 qualifier.precision],
5103 type_name);
5104 }
5105 } else if (this->type->specifier->structure == NULL) {
5106 _mesa_glsl_warning(&loc, state, "empty declaration");
5107 }
5108 }
5109 }
5110
5111 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
5112 const struct glsl_type *var_type;
5113 ir_variable *var;
5114 const char *identifier = decl->identifier;
5115 /* FINISHME: Emit a warning if a variable declaration shadows a
5116 * FINISHME: declaration at a higher scope.
5117 */
5118
5119 if ((decl_type == NULL) || decl_type->is_void()) {
5120 if (type_name != NULL) {
5121 _mesa_glsl_error(& loc, state,
5122 "invalid type `%s' in declaration of `%s'",
5123 type_name, decl->identifier);
5124 } else {
5125 _mesa_glsl_error(& loc, state,
5126 "invalid type in declaration of `%s'",
5127 decl->identifier);
5128 }
5129 continue;
5130 }
5131
5132 if (this->type->qualifier.is_subroutine_decl()) {
5133 const glsl_type *t;
5134 const char *name;
5135
5136 t = state->symbols->get_type(this->type->specifier->type_name);
5137 if (!t)
5138 _mesa_glsl_error(& loc, state,
5139 "invalid type in declaration of `%s'",
5140 decl->identifier);
5141 name = ralloc_asprintf(ctx, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state->stage), decl->identifier);
5142
5143 identifier = name;
5144
5145 }
5146 var_type = process_array_type(&loc, decl_type, decl->array_specifier,
5147 state);
5148
5149 var = new(ctx) ir_variable(var_type, identifier, ir_var_auto);
5150
5151 /* The 'varying in' and 'varying out' qualifiers can only be used with
5152 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5153 * yet.
5154 */
5155 if (this->type->qualifier.flags.q.varying) {
5156 if (this->type->qualifier.flags.q.in) {
5157 _mesa_glsl_error(& loc, state,
5158 "`varying in' qualifier in declaration of "
5159 "`%s' only valid for geometry shaders using "
5160 "ARB_geometry_shader4 or EXT_geometry_shader4",
5161 decl->identifier);
5162 } else if (this->type->qualifier.flags.q.out) {
5163 _mesa_glsl_error(& loc, state,
5164 "`varying out' qualifier in declaration of "
5165 "`%s' only valid for geometry shaders using "
5166 "ARB_geometry_shader4 or EXT_geometry_shader4",
5167 decl->identifier);
5168 }
5169 }
5170
5171 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5172 *
5173 * "Global variables can only use the qualifiers const,
5174 * attribute, uniform, or varying. Only one may be
5175 * specified.
5176 *
5177 * Local variables can only use the qualifier const."
5178 *
5179 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5180 * any extension that adds the 'layout' keyword.
5181 */
5182 if (!state->is_version(130, 300)
5183 && !state->has_explicit_attrib_location()
5184 && !state->has_separate_shader_objects()
5185 && !state->ARB_fragment_coord_conventions_enable) {
5186 /* GL_EXT_gpu_shader4 only allows "varying out" on fragment shader
5187 * outputs. (the varying flag is not set by the parser)
5188 */
5189 if (this->type->qualifier.flags.q.out &&
5190 (!state->EXT_gpu_shader4_enable ||
5191 state->stage != MESA_SHADER_FRAGMENT)) {
5192 _mesa_glsl_error(& loc, state,
5193 "`out' qualifier in declaration of `%s' "
5194 "only valid for function parameters in %s",
5195 decl->identifier, state->get_version_string());
5196 }
5197 if (this->type->qualifier.flags.q.in) {
5198 _mesa_glsl_error(& loc, state,
5199 "`in' qualifier in declaration of `%s' "
5200 "only valid for function parameters in %s",
5201 decl->identifier, state->get_version_string());
5202 }
5203 /* FINISHME: Test for other invalid qualifiers. */
5204 }
5205
5206 apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
5207 & loc, false);
5208 apply_layout_qualifier_to_variable(&this->type->qualifier, var, state,
5209 &loc);
5210
5211 if ((var->data.mode == ir_var_auto || var->data.mode == ir_var_temporary
5212 || var->data.mode == ir_var_shader_out)
5213 && (var->type->is_numeric() || var->type->is_boolean())
5214 && state->zero_init) {
5215 const ir_constant_data data = { { 0 } };
5216 var->data.has_initializer = true;
5217 var->constant_initializer = new(var) ir_constant(var->type, &data);
5218 }
5219
5220 if (this->type->qualifier.flags.q.invariant) {
5221 if (!is_allowed_invariant(var, state)) {
5222 _mesa_glsl_error(&loc, state,
5223 "`%s' cannot be marked invariant; interfaces between "
5224 "shader stages only", var->name);
5225 }
5226 }
5227
5228 if (state->current_function != NULL) {
5229 const char *mode = NULL;
5230 const char *extra = "";
5231
5232 /* There is no need to check for 'inout' here because the parser will
5233 * only allow that in function parameter lists.
5234 */
5235 if (this->type->qualifier.flags.q.attribute) {
5236 mode = "attribute";
5237 } else if (this->type->qualifier.is_subroutine_decl()) {
5238 mode = "subroutine uniform";
5239 } else if (this->type->qualifier.flags.q.uniform) {
5240 mode = "uniform";
5241 } else if (this->type->qualifier.flags.q.varying) {
5242 mode = "varying";
5243 } else if (this->type->qualifier.flags.q.in) {
5244 mode = "in";
5245 extra = " or in function parameter list";
5246 } else if (this->type->qualifier.flags.q.out) {
5247 mode = "out";
5248 extra = " or in function parameter list";
5249 }
5250
5251 if (mode) {
5252 _mesa_glsl_error(& loc, state,
5253 "%s variable `%s' must be declared at "
5254 "global scope%s",
5255 mode, var->name, extra);
5256 }
5257 } else if (var->data.mode == ir_var_shader_in) {
5258 var->data.read_only = true;
5259
5260 if (state->stage == MESA_SHADER_VERTEX) {
5261 bool error_emitted = false;
5262
5263 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5264 *
5265 * "Vertex shader inputs can only be float, floating-point
5266 * vectors, matrices, signed and unsigned integers and integer
5267 * vectors. Vertex shader inputs can also form arrays of these
5268 * types, but not structures."
5269 *
5270 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5271 *
5272 * "Vertex shader inputs can only be float, floating-point
5273 * vectors, matrices, signed and unsigned integers and integer
5274 * vectors. They cannot be arrays or structures."
5275 *
5276 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5277 *
5278 * "The attribute qualifier can be used only with float,
5279 * floating-point vectors, and matrices. Attribute variables
5280 * cannot be declared as arrays or structures."
5281 *
5282 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5283 *
5284 * "Vertex shader inputs can only be float, floating-point
5285 * vectors, matrices, signed and unsigned integers and integer
5286 * vectors. Vertex shader inputs cannot be arrays or
5287 * structures."
5288 *
5289 * From section 4.3.4 of the ARB_bindless_texture spec:
5290 *
5291 * "(modify third paragraph of the section to allow sampler and
5292 * image types) ... Vertex shader inputs can only be float,
5293 * single-precision floating-point scalars, single-precision
5294 * floating-point vectors, matrices, signed and unsigned
5295 * integers and integer vectors, sampler and image types."
5296 */
5297 const glsl_type *check_type = var->type->without_array();
5298
5299 switch (check_type->base_type) {
5300 case GLSL_TYPE_FLOAT:
5301 break;
5302 case GLSL_TYPE_UINT64:
5303 case GLSL_TYPE_INT64:
5304 break;
5305 case GLSL_TYPE_UINT:
5306 case GLSL_TYPE_INT:
5307 if (state->is_version(120, 300) || state->EXT_gpu_shader4_enable)
5308 break;
5309 case GLSL_TYPE_DOUBLE:
5310 if (check_type->is_double() && (state->is_version(410, 0) || state->ARB_vertex_attrib_64bit_enable))
5311 break;
5312 case GLSL_TYPE_SAMPLER:
5313 if (check_type->is_sampler() && state->has_bindless())
5314 break;
5315 case GLSL_TYPE_IMAGE:
5316 if (check_type->is_image() && state->has_bindless())
5317 break;
5318 /* FALLTHROUGH */
5319 default:
5320 _mesa_glsl_error(& loc, state,
5321 "vertex shader input / attribute cannot have "
5322 "type %s`%s'",
5323 var->type->is_array() ? "array of " : "",
5324 check_type->name);
5325 error_emitted = true;
5326 }
5327
5328 if (!error_emitted && var->type->is_array() &&
5329 !state->check_version(150, 0, &loc,
5330 "vertex shader input / attribute "
5331 "cannot have array type")) {
5332 error_emitted = true;
5333 }
5334 } else if (state->stage == MESA_SHADER_GEOMETRY) {
5335 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5336 *
5337 * Geometry shader input variables get the per-vertex values
5338 * written out by vertex shader output variables of the same
5339 * names. Since a geometry shader operates on a set of
5340 * vertices, each input varying variable (or input block, see
5341 * interface blocks below) needs to be declared as an array.
5342 */
5343 if (!var->type->is_array()) {
5344 _mesa_glsl_error(&loc, state,
5345 "geometry shader inputs must be arrays");
5346 }
5347
5348 handle_geometry_shader_input_decl(state, loc, var);
5349 } else if (state->stage == MESA_SHADER_FRAGMENT) {
5350 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5351 *
5352 * It is a compile-time error to declare a fragment shader
5353 * input with, or that contains, any of the following types:
5354 *
5355 * * A boolean type
5356 * * An opaque type
5357 * * An array of arrays
5358 * * An array of structures
5359 * * A structure containing an array
5360 * * A structure containing a structure
5361 */
5362 if (state->es_shader) {
5363 const glsl_type *check_type = var->type->without_array();
5364 if (check_type->is_boolean() ||
5365 check_type->contains_opaque()) {
5366 _mesa_glsl_error(&loc, state,
5367 "fragment shader input cannot have type %s",
5368 check_type->name);
5369 }
5370 if (var->type->is_array() &&
5371 var->type->fields.array->is_array()) {
5372 _mesa_glsl_error(&loc, state,
5373 "%s shader output "
5374 "cannot have an array of arrays",
5375 _mesa_shader_stage_to_string(state->stage));
5376 }
5377 if (var->type->is_array() &&
5378 var->type->fields.array->is_struct()) {
5379 _mesa_glsl_error(&loc, state,
5380 "fragment shader input "
5381 "cannot have an array of structs");
5382 }
5383 if (var->type->is_struct()) {
5384 for (unsigned i = 0; i < var->type->length; i++) {
5385 if (var->type->fields.structure[i].type->is_array() ||
5386 var->type->fields.structure[i].type->is_struct())
5387 _mesa_glsl_error(&loc, state,
5388 "fragment shader input cannot have "
5389 "a struct that contains an "
5390 "array or struct");
5391 }
5392 }
5393 }
5394 } else if (state->stage == MESA_SHADER_TESS_CTRL ||
5395 state->stage == MESA_SHADER_TESS_EVAL) {
5396 handle_tess_shader_input_decl(state, loc, var);
5397 }
5398 } else if (var->data.mode == ir_var_shader_out) {
5399 const glsl_type *check_type = var->type->without_array();
5400
5401 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5402 *
5403 * It is a compile-time error to declare a fragment shader output
5404 * that contains any of the following:
5405 *
5406 * * A Boolean type (bool, bvec2 ...)
5407 * * A double-precision scalar or vector (double, dvec2 ...)
5408 * * An opaque type
5409 * * Any matrix type
5410 * * A structure
5411 */
5412 if (state->stage == MESA_SHADER_FRAGMENT) {
5413 if (check_type->is_struct() || check_type->is_matrix())
5414 _mesa_glsl_error(&loc, state,
5415 "fragment shader output "
5416 "cannot have struct or matrix type");
5417 switch (check_type->base_type) {
5418 case GLSL_TYPE_UINT:
5419 case GLSL_TYPE_INT:
5420 case GLSL_TYPE_FLOAT:
5421 break;
5422 default:
5423 _mesa_glsl_error(&loc, state,
5424 "fragment shader output cannot have "
5425 "type %s", check_type->name);
5426 }
5427 }
5428
5429 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5430 *
5431 * It is a compile-time error to declare a vertex shader output
5432 * with, or that contains, any of the following types:
5433 *
5434 * * A boolean type
5435 * * An opaque type
5436 * * An array of arrays
5437 * * An array of structures
5438 * * A structure containing an array
5439 * * A structure containing a structure
5440 *
5441 * It is a compile-time error to declare a fragment shader output
5442 * with, or that contains, any of the following types:
5443 *
5444 * * A boolean type
5445 * * An opaque type
5446 * * A matrix
5447 * * A structure
5448 * * An array of array
5449 *
5450 * ES 3.20 updates this to apply to tessellation and geometry shaders
5451 * as well. Because there are per-vertex arrays in the new stages,
5452 * it strikes the "array of..." rules and replaces them with these:
5453 *
5454 * * For per-vertex-arrayed variables (applies to tessellation
5455 * control, tessellation evaluation and geometry shaders):
5456 *
5457 * * Per-vertex-arrayed arrays of arrays
5458 * * Per-vertex-arrayed arrays of structures
5459 *
5460 * * For non-per-vertex-arrayed variables:
5461 *
5462 * * An array of arrays
5463 * * An array of structures
5464 *
5465 * which basically says to unwrap the per-vertex aspect and apply
5466 * the old rules.
5467 */
5468 if (state->es_shader) {
5469 if (var->type->is_array() &&
5470 var->type->fields.array->is_array()) {
5471 _mesa_glsl_error(&loc, state,
5472 "%s shader output "
5473 "cannot have an array of arrays",
5474 _mesa_shader_stage_to_string(state->stage));
5475 }
5476 if (state->stage <= MESA_SHADER_GEOMETRY) {
5477 const glsl_type *type = var->type;
5478
5479 if (state->stage == MESA_SHADER_TESS_CTRL &&
5480 !var->data.patch && var->type->is_array()) {
5481 type = var->type->fields.array;
5482 }
5483
5484 if (type->is_array() && type->fields.array->is_struct()) {
5485 _mesa_glsl_error(&loc, state,
5486 "%s shader output cannot have "
5487 "an array of structs",
5488 _mesa_shader_stage_to_string(state->stage));
5489 }
5490 if (type->is_struct()) {
5491 for (unsigned i = 0; i < type->length; i++) {
5492 if (type->fields.structure[i].type->is_array() ||
5493 type->fields.structure[i].type->is_struct())
5494 _mesa_glsl_error(&loc, state,
5495 "%s shader output cannot have a "
5496 "struct that contains an "
5497 "array or struct",
5498 _mesa_shader_stage_to_string(state->stage));
5499 }
5500 }
5501 }
5502 }
5503
5504 if (state->stage == MESA_SHADER_TESS_CTRL) {
5505 handle_tess_ctrl_shader_output_decl(state, loc, var);
5506 }
5507 } else if (var->type->contains_subroutine()) {
5508 /* declare subroutine uniforms as hidden */
5509 var->data.how_declared = ir_var_hidden;
5510 }
5511
5512 /* From section 4.3.4 of the GLSL 4.00 spec:
5513 * "Input variables may not be declared using the patch in qualifier
5514 * in tessellation control or geometry shaders."
5515 *
5516 * From section 4.3.6 of the GLSL 4.00 spec:
5517 * "It is an error to use patch out in a vertex, tessellation
5518 * evaluation, or geometry shader."
5519 *
5520 * This doesn't explicitly forbid using them in a fragment shader, but
5521 * that's probably just an oversight.
5522 */
5523 if (state->stage != MESA_SHADER_TESS_EVAL
5524 && this->type->qualifier.flags.q.patch
5525 && this->type->qualifier.flags.q.in) {
5526
5527 _mesa_glsl_error(&loc, state, "'patch in' can only be used in a "
5528 "tessellation evaluation shader");
5529 }
5530
5531 if (state->stage != MESA_SHADER_TESS_CTRL
5532 && this->type->qualifier.flags.q.patch
5533 && this->type->qualifier.flags.q.out) {
5534
5535 _mesa_glsl_error(&loc, state, "'patch out' can only be used in a "
5536 "tessellation control shader");
5537 }
5538
5539 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5540 */
5541 if (this->type->qualifier.precision != ast_precision_none) {
5542 state->check_precision_qualifiers_allowed(&loc);
5543 }
5544
5545 if (this->type->qualifier.precision != ast_precision_none &&
5546 !precision_qualifier_allowed(var->type)) {
5547 _mesa_glsl_error(&loc, state,
5548 "precision qualifiers apply only to floating point"
5549 ", integer and opaque types");
5550 }
5551
5552 /* From section 4.1.7 of the GLSL 4.40 spec:
5553 *
5554 * "[Opaque types] can only be declared as function
5555 * parameters or uniform-qualified variables."
5556 *
5557 * From section 4.1.7 of the ARB_bindless_texture spec:
5558 *
5559 * "Samplers may be declared as shader inputs and outputs, as uniform
5560 * variables, as temporary variables, and as function parameters."
5561 *
5562 * From section 4.1.X of the ARB_bindless_texture spec:
5563 *
5564 * "Images may be declared as shader inputs and outputs, as uniform
5565 * variables, as temporary variables, and as function parameters."
5566 */
5567 if (!this->type->qualifier.flags.q.uniform &&
5568 (var_type->contains_atomic() ||
5569 (!state->has_bindless() && var_type->contains_opaque()))) {
5570 _mesa_glsl_error(&loc, state,
5571 "%s variables must be declared uniform",
5572 state->has_bindless() ? "atomic" : "opaque");
5573 }
5574
5575 /* Process the initializer and add its instructions to a temporary
5576 * list. This list will be added to the instruction stream (below) after
5577 * the declaration is added. This is done because in some cases (such as
5578 * redeclarations) the declaration may not actually be added to the
5579 * instruction stream.
5580 */
5581 exec_list initializer_instructions;
5582
5583 /* Examine var name here since var may get deleted in the next call */
5584 bool var_is_gl_id = is_gl_identifier(var->name);
5585
5586 bool is_redeclaration;
5587 var = get_variable_being_redeclared(&var, decl->get_location(), state,
5588 false /* allow_all_redeclarations */,
5589 &is_redeclaration);
5590 if (is_redeclaration) {
5591 if (var_is_gl_id &&
5592 var->data.how_declared == ir_var_declared_in_block) {
5593 _mesa_glsl_error(&loc, state,
5594 "`%s' has already been redeclared using "
5595 "gl_PerVertex", var->name);
5596 }
5597 var->data.how_declared = ir_var_declared_normally;
5598 }
5599
5600 if (decl->initializer != NULL) {
5601 result = process_initializer(var,
5602 decl, this->type,
5603 &initializer_instructions, state);
5604 } else {
5605 validate_array_dimensions(var_type, state, &loc);
5606 }
5607
5608 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5609 *
5610 * "It is an error to write to a const variable outside of
5611 * its declaration, so they must be initialized when
5612 * declared."
5613 */
5614 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
5615 _mesa_glsl_error(& loc, state,
5616 "const declaration of `%s' must be initialized",
5617 decl->identifier);
5618 }
5619
5620 if (state->es_shader) {
5621 const glsl_type *const t = var->type;
5622
5623 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5624 *
5625 * The GL_OES_tessellation_shader spec says about inputs:
5626 *
5627 * "Declaring an array size is optional. If no size is specified,
5628 * it will be taken from the implementation-dependent maximum
5629 * patch size (gl_MaxPatchVertices)."
5630 *
5631 * and about TCS outputs:
5632 *
5633 * "If no size is specified, it will be taken from output patch
5634 * size declared in the shader."
5635 *
5636 * The GL_OES_geometry_shader spec says:
5637 *
5638 * "All geometry shader input unsized array declarations will be
5639 * sized by an earlier input primitive layout qualifier, when
5640 * present, as per the following table."
5641 */
5642 const bool implicitly_sized =
5643 (var->data.mode == ir_var_shader_in &&
5644 state->stage >= MESA_SHADER_TESS_CTRL &&
5645 state->stage <= MESA_SHADER_GEOMETRY) ||
5646 (var->data.mode == ir_var_shader_out &&
5647 state->stage == MESA_SHADER_TESS_CTRL);
5648
5649 if (t->is_unsized_array() && !implicitly_sized)
5650 /* Section 10.17 of the GLSL ES 1.00 specification states that
5651 * unsized array declarations have been removed from the language.
5652 * Arrays that are sized using an initializer are still explicitly
5653 * sized. However, GLSL ES 1.00 does not allow array
5654 * initializers. That is only allowed in GLSL ES 3.00.
5655 *
5656 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5657 *
5658 * "An array type can also be formed without specifying a size
5659 * if the definition includes an initializer:
5660 *
5661 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5662 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5663 *
5664 * float a[5];
5665 * float b[] = a;"
5666 */
5667 _mesa_glsl_error(& loc, state,
5668 "unsized array declarations are not allowed in "
5669 "GLSL ES");
5670 }
5671
5672 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5673 *
5674 * "It is a compile-time error to declare an unsized array of
5675 * atomic_uint"
5676 */
5677 if (var->type->is_unsized_array() &&
5678 var->type->without_array()->base_type == GLSL_TYPE_ATOMIC_UINT) {
5679 _mesa_glsl_error(& loc, state,
5680 "Unsized array of atomic_uint is not allowed");
5681 }
5682
5683 /* If the declaration is not a redeclaration, there are a few additional
5684 * semantic checks that must be applied. In addition, variable that was
5685 * created for the declaration should be added to the IR stream.
5686 */
5687 if (!is_redeclaration) {
5688 validate_identifier(decl->identifier, loc, state);
5689
5690 /* Add the variable to the symbol table. Note that the initializer's
5691 * IR was already processed earlier (though it hasn't been emitted
5692 * yet), without the variable in scope.
5693 *
5694 * This differs from most C-like languages, but it follows the GLSL
5695 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5696 * spec:
5697 *
5698 * "Within a declaration, the scope of a name starts immediately
5699 * after the initializer if present or immediately after the name
5700 * being declared if not."
5701 */
5702 if (!state->symbols->add_variable(var)) {
5703 YYLTYPE loc = this->get_location();
5704 _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
5705 "current scope", decl->identifier);
5706 continue;
5707 }
5708
5709 /* Push the variable declaration to the top. It means that all the
5710 * variable declarations will appear in a funny last-to-first order,
5711 * but otherwise we run into trouble if a function is prototyped, a
5712 * global var is decled, then the function is defined with usage of
5713 * the global var. See glslparsertest's CorrectModule.frag.
5714 * However, do not insert declarations before default precision statements
5715 * or type declarations.
5716 */
5717 ir_instruction* before_node = (ir_instruction*)instructions->get_head();
5718 while (before_node && (before_node->ir_type == ir_type_precision || before_node->ir_type == ir_type_typedecl))
5719 before_node = (ir_instruction*)before_node->next;
5720 if (before_node)
5721 before_node->insert_before(var);
5722 else
5723 instructions->push_head(var);
5724 }
5725
5726 instructions->append_list(&initializer_instructions);
5727 }
5728
5729
5730 /* Generally, variable declarations do not have r-values. However,
5731 * one is used for the declaration in
5732 *
5733 * while (bool b = some_condition()) {
5734 * ...
5735 * }
5736 *
5737 * so we return the rvalue from the last seen declaration here.
5738 */
5739 return result;
5740 }
5741
5742
5743 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)5744 ast_parameter_declarator::hir(exec_list *instructions,
5745 struct _mesa_glsl_parse_state *state)
5746 {
5747 void *ctx = state;
5748 const struct glsl_type *type;
5749 const char *name = NULL;
5750 YYLTYPE loc = this->get_location();
5751
5752 type = this->type->glsl_type(& name, state);
5753
5754 if (type == NULL) {
5755 if (name != NULL) {
5756 _mesa_glsl_error(& loc, state,
5757 "invalid type `%s' in declaration of `%s'",
5758 name, this->identifier);
5759 } else {
5760 _mesa_glsl_error(& loc, state,
5761 "invalid type in declaration of `%s'",
5762 this->identifier);
5763 }
5764
5765 type = glsl_type::error_type;
5766 }
5767
5768 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5769 *
5770 * "Functions that accept no input arguments need not use void in the
5771 * argument list because prototypes (or definitions) are required and
5772 * therefore there is no ambiguity when an empty argument list "( )" is
5773 * declared. The idiom "(void)" as a parameter list is provided for
5774 * convenience."
5775 *
5776 * Placing this check here prevents a void parameter being set up
5777 * for a function, which avoids tripping up checks for main taking
5778 * parameters and lookups of an unnamed symbol.
5779 */
5780 if (type->is_void()) {
5781 if (this->identifier != NULL)
5782 _mesa_glsl_error(& loc, state,
5783 "named parameter cannot have type `void'");
5784
5785 is_void = true;
5786 return NULL;
5787 }
5788
5789 if (formal_parameter && (this->identifier == NULL)) {
5790 _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
5791 return NULL;
5792 }
5793
5794 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5795 * call already handled the "vec4[..] foo" case.
5796 */
5797 type = process_array_type(&loc, type, this->array_specifier, state);
5798
5799 if (!type->is_error() && type->is_unsized_array()) {
5800 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
5801 "a declared size");
5802 type = glsl_type::error_type;
5803 }
5804
5805 is_void = false;
5806 ir_variable *var = new(ctx)
5807 ir_variable(type, this->identifier, ir_var_function_in);
5808
5809 /* Apply any specified qualifiers to the parameter declaration. Note that
5810 * for function parameters the default mode is 'in'.
5811 */
5812 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc,
5813 true);
5814
5815 /* From section 4.1.7 of the GLSL 4.40 spec:
5816 *
5817 * "Opaque variables cannot be treated as l-values; hence cannot
5818 * be used as out or inout function parameters, nor can they be
5819 * assigned into."
5820 *
5821 * From section 4.1.7 of the ARB_bindless_texture spec:
5822 *
5823 * "Samplers can be used as l-values, so can be assigned into and used
5824 * as "out" and "inout" function parameters."
5825 *
5826 * From section 4.1.X of the ARB_bindless_texture spec:
5827 *
5828 * "Images can be used as l-values, so can be assigned into and used as
5829 * "out" and "inout" function parameters."
5830 */
5831 if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out)
5832 && (type->contains_atomic() ||
5833 (!state->has_bindless() && type->contains_opaque()))) {
5834 _mesa_glsl_error(&loc, state, "out and inout parameters cannot "
5835 "contain %s variables",
5836 state->has_bindless() ? "atomic" : "opaque");
5837 type = glsl_type::error_type;
5838 }
5839
5840 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5841 *
5842 * "When calling a function, expressions that do not evaluate to
5843 * l-values cannot be passed to parameters declared as out or inout."
5844 *
5845 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5846 *
5847 * "Other binary or unary expressions, non-dereferenced arrays,
5848 * function names, swizzles with repeated fields, and constants
5849 * cannot be l-values."
5850 *
5851 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5852 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5853 */
5854 if ((var->data.mode == ir_var_function_inout || var->data.mode == ir_var_function_out)
5855 && type->is_array()
5856 && !state->check_version(120, 100, &loc,
5857 "arrays cannot be out or inout parameters")) {
5858 type = glsl_type::error_type;
5859 }
5860
5861 instructions->push_tail(var);
5862
5863 /* Parameter declarations do not have r-values.
5864 */
5865 return NULL;
5866 }
5867
5868
5869 void
parameters_to_hir(exec_list * ast_parameters,bool formal,exec_list * ir_parameters,_mesa_glsl_parse_state * state)5870 ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
5871 bool formal,
5872 exec_list *ir_parameters,
5873 _mesa_glsl_parse_state *state)
5874 {
5875 ast_parameter_declarator *void_param = NULL;
5876 unsigned count = 0;
5877
5878 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
5879 param->formal_parameter = formal;
5880 param->hir(ir_parameters, state);
5881
5882 if (param->is_void)
5883 void_param = param;
5884
5885 count++;
5886 }
5887
5888 if ((void_param != NULL) && (count > 1)) {
5889 YYLTYPE loc = void_param->get_location();
5890
5891 _mesa_glsl_error(& loc, state,
5892 "`void' parameter must be only parameter");
5893 }
5894 }
5895
5896
5897 void
emit_function(_mesa_glsl_parse_state * state,ir_function * f)5898 emit_function(_mesa_glsl_parse_state *state, ir_function *f)
5899 {
5900 /* IR invariants disallow function declarations or definitions
5901 * nested within other function definitions. But there is no
5902 * requirement about the relative order of function declarations
5903 * and definitions with respect to one another. So simply insert
5904 * the new ir_function block at the end of the toplevel instruction
5905 * list.
5906 */
5907 state->toplevel_ir->push_tail(f);
5908 }
5909
5910
5911 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)5912 ast_function::hir(exec_list *instructions,
5913 struct _mesa_glsl_parse_state *state)
5914 {
5915 void *ctx = state;
5916 ir_function *f = NULL;
5917 ir_function_signature *sig = NULL;
5918 exec_list hir_parameters;
5919 YYLTYPE loc = this->get_location();
5920
5921 const char *const name = identifier;
5922
5923 /* New functions are always added to the top-level IR instruction stream,
5924 * so this instruction list pointer is ignored. See also emit_function
5925 * (called below).
5926 */
5927 (void) instructions;
5928
5929 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5930 *
5931 * "Function declarations (prototypes) cannot occur inside of functions;
5932 * they must be at global scope, or for the built-in functions, outside
5933 * the global scope."
5934 *
5935 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5936 *
5937 * "User defined functions may only be defined within the global scope."
5938 *
5939 * Note that this language does not appear in GLSL 1.10.
5940 */
5941 if ((state->current_function != NULL) &&
5942 state->is_version(120, 100)) {
5943 YYLTYPE loc = this->get_location();
5944 _mesa_glsl_error(&loc, state,
5945 "declaration of function `%s' not allowed within "
5946 "function body", name);
5947 }
5948
5949 validate_identifier(name, this->get_location(), state);
5950
5951 /* Convert the list of function parameters to HIR now so that they can be
5952 * used below to compare this function's signature with previously seen
5953 * signatures for functions with the same name.
5954 */
5955 ast_parameter_declarator::parameters_to_hir(& this->parameters,
5956 is_definition,
5957 & hir_parameters, state);
5958
5959 const char *return_type_name;
5960 const glsl_type *return_type =
5961 this->return_type->glsl_type(& return_type_name, state);
5962
5963 if (!return_type) {
5964 YYLTYPE loc = this->get_location();
5965 _mesa_glsl_error(&loc, state,
5966 "function `%s' has undeclared return type `%s'",
5967 name, return_type_name);
5968 return_type = glsl_type::error_type;
5969 }
5970
5971 /* ARB_shader_subroutine states:
5972 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5973 * subroutine(...) to a function declaration."
5974 */
5975 if (this->return_type->qualifier.subroutine_list && !is_definition) {
5976 YYLTYPE loc = this->get_location();
5977 _mesa_glsl_error(&loc, state,
5978 "function declaration `%s' cannot have subroutine prepended",
5979 name);
5980 }
5981
5982 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5983 * "No qualifier is allowed on the return type of a function."
5984 */
5985 if (this->return_type->has_qualifiers(state)) {
5986 YYLTYPE loc = this->get_location();
5987 _mesa_glsl_error(& loc, state,
5988 "function `%s' return type has qualifiers", name);
5989 }
5990
5991 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5992 *
5993 * "Arrays are allowed as arguments and as the return type. In both
5994 * cases, the array must be explicitly sized."
5995 */
5996 if (return_type->is_unsized_array()) {
5997 YYLTYPE loc = this->get_location();
5998 _mesa_glsl_error(& loc, state,
5999 "function `%s' return type array must be explicitly "
6000 "sized", name);
6001 }
6002
6003 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
6004 *
6005 * "Arrays are allowed as arguments, but not as the return type. [...]
6006 * The return type can also be a structure if the structure does not
6007 * contain an array."
6008 */
6009 if (state->language_version == 100 && return_type->contains_array()) {
6010 YYLTYPE loc = this->get_location();
6011 _mesa_glsl_error(& loc, state,
6012 "function `%s' return type contains an array", name);
6013 }
6014
6015 /* From section 4.1.7 of the GLSL 4.40 spec:
6016 *
6017 * "[Opaque types] can only be declared as function parameters
6018 * or uniform-qualified variables."
6019 *
6020 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
6021 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
6022 * (Images)", this should be allowed.
6023 */
6024 if (return_type->contains_atomic() ||
6025 (!state->has_bindless() && return_type->contains_opaque())) {
6026 YYLTYPE loc = this->get_location();
6027 _mesa_glsl_error(&loc, state,
6028 "function `%s' return type can't contain an %s type",
6029 name, state->has_bindless() ? "atomic" : "opaque");
6030 }
6031
6032 /**/
6033 if (return_type->is_subroutine()) {
6034 YYLTYPE loc = this->get_location();
6035 _mesa_glsl_error(&loc, state,
6036 "function `%s' return type can't be a subroutine type",
6037 name);
6038 }
6039
6040 /* Get the precision for the return type */
6041 unsigned return_precision;
6042
6043 if (state->es_shader) {
6044 YYLTYPE loc = this->get_location();
6045 return_precision =
6046 select_gles_precision(this->return_type->qualifier.precision,
6047 return_type,
6048 state,
6049 &loc);
6050 } else {
6051 return_precision = GLSL_PRECISION_NONE;
6052 }
6053
6054 /* Create an ir_function if one doesn't already exist. */
6055 f = state->symbols->get_function(name);
6056 if (f == NULL) {
6057 f = new(ctx) ir_function(name);
6058 if (!this->return_type->qualifier.is_subroutine_decl()) {
6059 if (!state->symbols->add_function(f)) {
6060 /* This function name shadows a non-function use of the same name. */
6061 YYLTYPE loc = this->get_location();
6062 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
6063 "non-function", name);
6064 return NULL;
6065 }
6066 }
6067 emit_function(state, f);
6068 }
6069
6070 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
6071 *
6072 * "A shader cannot redefine or overload built-in functions."
6073 *
6074 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
6075 *
6076 * "User code can overload the built-in functions but cannot redefine
6077 * them."
6078 */
6079 if (state->es_shader) {
6080 /* Local shader has no exact candidates; check the built-ins. */
6081 if (state->language_version >= 300 &&
6082 _mesa_glsl_has_builtin_function(state, name)) {
6083 YYLTYPE loc = this->get_location();
6084 _mesa_glsl_error(& loc, state,
6085 "A shader cannot redefine or overload built-in "
6086 "function `%s' in GLSL ES 3.00", name);
6087 return NULL;
6088 }
6089
6090 if (state->language_version == 100) {
6091 ir_function_signature *sig =
6092 _mesa_glsl_find_builtin_function(state, name, &hir_parameters);
6093 if (sig && sig->is_builtin()) {
6094 _mesa_glsl_error(& loc, state,
6095 "A shader cannot redefine built-in "
6096 "function `%s' in GLSL ES 1.00", name);
6097 }
6098 }
6099 }
6100
6101 /* Verify that this function's signature either doesn't match a previously
6102 * seen signature for a function with the same name, or, if a match is found,
6103 * that the previously seen signature does not have an associated definition.
6104 */
6105 if (state->es_shader || f->has_user_signature()) {
6106 sig = f->exact_matching_signature(state, &hir_parameters);
6107 if (sig != NULL) {
6108 const char *badvar = sig->qualifiers_match(&hir_parameters);
6109 if (badvar != NULL) {
6110 YYLTYPE loc = this->get_location();
6111
6112 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
6113 "qualifiers don't match prototype", name, badvar);
6114 }
6115
6116 if (sig->return_type != return_type) {
6117 YYLTYPE loc = this->get_location();
6118
6119 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
6120 "match prototype", name);
6121 }
6122
6123 if (sig->return_precision != return_precision) {
6124 YYLTYPE loc = this->get_location();
6125
6126 _mesa_glsl_error(&loc, state, "function `%s' return type precision "
6127 "doesn't match prototype", name);
6128 }
6129
6130 if (sig->is_defined) {
6131 if (is_definition) {
6132 YYLTYPE loc = this->get_location();
6133 _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
6134 } else {
6135 /* We just encountered a prototype that exactly matches a
6136 * function that's already been defined. This is redundant,
6137 * and we should ignore it.
6138 */
6139 return NULL;
6140 }
6141 } else if (state->language_version == 100 && !is_definition) {
6142 /* From the GLSL 1.00 spec, section 4.2.7:
6143 *
6144 * "A particular variable, structure or function declaration
6145 * may occur at most once within a scope with the exception
6146 * that a single function prototype plus the corresponding
6147 * function definition are allowed."
6148 */
6149 YYLTYPE loc = this->get_location();
6150 _mesa_glsl_error(&loc, state, "function `%s' redeclared", name);
6151 }
6152 }
6153 }
6154
6155 /* Verify the return type of main() */
6156 if (strcmp(name, "main") == 0) {
6157 if (! return_type->is_void()) {
6158 YYLTYPE loc = this->get_location();
6159
6160 _mesa_glsl_error(& loc, state, "main() must return void");
6161 }
6162
6163 if (!hir_parameters.is_empty()) {
6164 YYLTYPE loc = this->get_location();
6165
6166 _mesa_glsl_error(& loc, state, "main() must not take any parameters");
6167 }
6168 }
6169
6170 /* Finish storing the information about this new function in its signature.
6171 */
6172 if (sig == NULL) {
6173 sig = new(ctx) ir_function_signature(return_type);
6174 sig->return_precision = return_precision;
6175 f->add_signature(sig);
6176 }
6177
6178 sig->replace_parameters(&hir_parameters);
6179 signature = sig;
6180
6181 if (this->return_type->qualifier.subroutine_list) {
6182 int idx;
6183
6184 if (this->return_type->qualifier.flags.q.explicit_index) {
6185 unsigned qual_index;
6186 if (process_qualifier_constant(state, &loc, "index",
6187 this->return_type->qualifier.index,
6188 &qual_index)) {
6189 if (!state->has_explicit_uniform_location()) {
6190 _mesa_glsl_error(&loc, state, "subroutine index requires "
6191 "GL_ARB_explicit_uniform_location or "
6192 "GLSL 4.30");
6193 } else if (qual_index >= MAX_SUBROUTINES) {
6194 _mesa_glsl_error(&loc, state,
6195 "invalid subroutine index (%d) index must "
6196 "be a number between 0 and "
6197 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index,
6198 MAX_SUBROUTINES - 1);
6199 } else {
6200 f->subroutine_index = qual_index;
6201 }
6202 }
6203 }
6204
6205 f->num_subroutine_types = this->return_type->qualifier.subroutine_list->declarations.length();
6206 f->subroutine_types = ralloc_array(state, const struct glsl_type *,
6207 f->num_subroutine_types);
6208 idx = 0;
6209 foreach_list_typed(ast_declaration, decl, link, &this->return_type->qualifier.subroutine_list->declarations) {
6210 const struct glsl_type *type;
6211 /* the subroutine type must be already declared */
6212 type = state->symbols->get_type(decl->identifier);
6213 if (!type) {
6214 _mesa_glsl_error(& loc, state, "unknown type '%s' in subroutine function definition", decl->identifier);
6215 }
6216
6217 for (int i = 0; i < state->num_subroutine_types; i++) {
6218 ir_function *fn = state->subroutine_types[i];
6219 ir_function_signature *tsig = NULL;
6220
6221 if (strcmp(fn->name, decl->identifier))
6222 continue;
6223
6224 tsig = fn->matching_signature(state, &sig->parameters,
6225 false);
6226 if (!tsig) {
6227 _mesa_glsl_error(& loc, state, "subroutine type mismatch '%s' - signatures do not match\n", decl->identifier);
6228 } else {
6229 if (tsig->return_type != sig->return_type) {
6230 _mesa_glsl_error(& loc, state, "subroutine type mismatch '%s' - return types do not match\n", decl->identifier);
6231 }
6232 }
6233 }
6234 f->subroutine_types[idx++] = type;
6235 }
6236 state->subroutines = (ir_function **)reralloc(state, state->subroutines,
6237 ir_function *,
6238 state->num_subroutines + 1);
6239 state->subroutines[state->num_subroutines] = f;
6240 state->num_subroutines++;
6241
6242 }
6243
6244 if (this->return_type->qualifier.is_subroutine_decl()) {
6245 if (!state->symbols->add_type(this->identifier, glsl_type::get_subroutine_instance(this->identifier))) {
6246 _mesa_glsl_error(& loc, state, "type '%s' previously defined", this->identifier);
6247 return NULL;
6248 }
6249 state->subroutine_types = (ir_function **)reralloc(state, state->subroutine_types,
6250 ir_function *,
6251 state->num_subroutine_types + 1);
6252 state->subroutine_types[state->num_subroutine_types] = f;
6253 state->num_subroutine_types++;
6254
6255 f->is_subroutine = true;
6256 }
6257
6258 /* Function declarations (prototypes) do not have r-values.
6259 */
6260 return NULL;
6261 }
6262
6263
6264 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6265 ast_function_definition::hir(exec_list *instructions,
6266 struct _mesa_glsl_parse_state *state)
6267 {
6268 prototype->is_definition = true;
6269 prototype->hir(instructions, state);
6270
6271 ir_function_signature *signature = prototype->signature;
6272 if (signature == NULL)
6273 return NULL;
6274
6275 assert(state->current_function == NULL);
6276 state->current_function = signature;
6277 state->found_return = false;
6278 state->found_begin_interlock = false;
6279 state->found_end_interlock = false;
6280
6281 /* Duplicate parameters declared in the prototype as concrete variables.
6282 * Add these to the symbol table.
6283 */
6284 state->symbols->push_scope();
6285 foreach_in_list(ir_variable, var, &signature->parameters) {
6286 assert(var->as_variable() != NULL);
6287
6288 /* The only way a parameter would "exist" is if two parameters have
6289 * the same name.
6290 */
6291 if (state->symbols->name_declared_this_scope(var->name)) {
6292 YYLTYPE loc = this->get_location();
6293
6294 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
6295 } else {
6296 state->symbols->add_variable(var);
6297 }
6298 }
6299
6300 /* Convert the body of the function to HIR. */
6301 this->body->hir(&signature->body, state);
6302 signature->is_defined = true;
6303
6304 state->symbols->pop_scope();
6305
6306 assert(state->current_function == signature);
6307 state->current_function = NULL;
6308
6309 if (!signature->return_type->is_void() && !state->found_return) {
6310 YYLTYPE loc = this->get_location();
6311 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
6312 "%s, but no return statement",
6313 signature->function_name(),
6314 signature->return_type->name);
6315 }
6316
6317 /* Function definitions do not have r-values.
6318 */
6319 return NULL;
6320 }
6321
6322
6323 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6324 ast_jump_statement::hir(exec_list *instructions,
6325 struct _mesa_glsl_parse_state *state)
6326 {
6327 void *ctx = state;
6328
6329 switch (mode) {
6330 case ast_return: {
6331 ir_return *inst;
6332 assert(state->current_function);
6333
6334 if (opt_return_value) {
6335 ir_rvalue *ret = opt_return_value->hir(instructions, state);
6336
6337 /* The value of the return type can be NULL if the shader says
6338 * 'return foo();' and foo() is a function that returns void.
6339 *
6340 * NOTE: The GLSL spec doesn't say that this is an error. The type
6341 * of the return value is void. If the return type of the function is
6342 * also void, then this should compile without error. Seriously.
6343 */
6344 const glsl_type *const ret_type =
6345 (ret == NULL) ? glsl_type::void_type : ret->type;
6346
6347 /* Implicit conversions are not allowed for return values prior to
6348 * ARB_shading_language_420pack.
6349 */
6350 if (state->current_function->return_type != ret_type) {
6351 YYLTYPE loc = this->get_location();
6352
6353 if (state->has_420pack()) {
6354 if (!apply_implicit_conversion(state->current_function->return_type,
6355 ret, state)
6356 || (ret->type != state->current_function->return_type)) {
6357 _mesa_glsl_error(& loc, state,
6358 "could not implicitly convert return value "
6359 "to %s, in function `%s'",
6360 state->current_function->return_type->name,
6361 state->current_function->function_name());
6362 }
6363 } else {
6364 _mesa_glsl_error(& loc, state,
6365 "`return' with wrong type %s, in function `%s' "
6366 "returning %s",
6367 ret_type->name,
6368 state->current_function->function_name(),
6369 state->current_function->return_type->name);
6370 }
6371 } else if (state->current_function->return_type->base_type ==
6372 GLSL_TYPE_VOID) {
6373 YYLTYPE loc = this->get_location();
6374
6375 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6376 * specs add a clarification:
6377 *
6378 * "A void function can only use return without a return argument, even if
6379 * the return argument has void type. Return statements only accept values:
6380 *
6381 * void func1() { }
6382 * void func2() { return func1(); } // illegal return statement"
6383 */
6384 _mesa_glsl_error(& loc, state,
6385 "void functions can only use `return' without a "
6386 "return argument");
6387 }
6388
6389 inst = new(ctx) ir_return(ret);
6390 } else {
6391 if (state->current_function->return_type->base_type !=
6392 GLSL_TYPE_VOID) {
6393 YYLTYPE loc = this->get_location();
6394
6395 _mesa_glsl_error(& loc, state,
6396 "`return' with no value, in function %s returning "
6397 "non-void",
6398 state->current_function->function_name());
6399 }
6400 inst = new(ctx) ir_return;
6401 }
6402
6403 state->found_return = true;
6404 instructions->push_tail(inst);
6405 break;
6406 }
6407
6408 case ast_discard:
6409 if (state->stage != MESA_SHADER_FRAGMENT) {
6410 YYLTYPE loc = this->get_location();
6411
6412 _mesa_glsl_error(& loc, state,
6413 "`discard' may only appear in a fragment shader");
6414 }
6415 instructions->push_tail(new(ctx) ir_discard);
6416 break;
6417
6418 case ast_break:
6419 case ast_continue:
6420 if (mode == ast_continue &&
6421 state->loop_nesting_ast == NULL) {
6422 YYLTYPE loc = this->get_location();
6423
6424 _mesa_glsl_error(& loc, state, "continue may only appear in a loop");
6425 } else if (mode == ast_break &&
6426 state->loop_nesting_ast == NULL &&
6427 state->switch_state.switch_nesting_ast == NULL) {
6428 YYLTYPE loc = this->get_location();
6429
6430 _mesa_glsl_error(& loc, state,
6431 "break may only appear in a loop or a switch");
6432 } else {
6433 /* For a loop, inline the for loop expression again, since we don't
6434 * know where near the end of the loop body the normal copy of it is
6435 * going to be placed. Same goes for the condition for a do-while
6436 * loop.
6437 */
6438 if (state->loop_nesting_ast != NULL &&
6439 mode == ast_continue) {
6440 if (state->loop_nesting_ast->rest_expression) {
6441 state->loop_nesting_ast->rest_expression->hir(instructions,
6442 state);
6443 }
6444 if (state->loop_nesting_ast->mode ==
6445 ast_iteration_statement::ast_do_while) {
6446 state->loop_nesting_ast->condition_to_hir(instructions, state);
6447 }
6448 }
6449
6450 if (state->switch_state.is_switch_innermost &&
6451 mode == ast_break) {
6452 /* Force break out of switch by setting is_break switch state.
6453 */
6454 ir_variable *const is_break_var = state->switch_state.is_break_var;
6455 ir_dereference_variable *const deref_is_break_var =
6456 new(ctx) ir_dereference_variable(is_break_var);
6457 ir_constant *const true_val = new(ctx) ir_constant(true);
6458 ir_assignment *const set_break_var =
6459 new(ctx) ir_assignment(deref_is_break_var, true_val);
6460
6461 instructions->push_tail(set_break_var);
6462 } else {
6463 ir_loop_jump *const jump =
6464 new(ctx) ir_loop_jump((mode == ast_break)
6465 ? ir_loop_jump::jump_break
6466 : ir_loop_jump::jump_continue);
6467 instructions->push_tail(jump);
6468 }
6469 }
6470
6471 break;
6472 }
6473
6474 /* Jump instructions do not have r-values.
6475 */
6476 return NULL;
6477 }
6478
6479
6480 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6481 ast_demote_statement::hir(exec_list *instructions,
6482 struct _mesa_glsl_parse_state *state)
6483 {
6484 void *ctx = state;
6485
6486 if (state->stage != MESA_SHADER_FRAGMENT) {
6487 YYLTYPE loc = this->get_location();
6488
6489 _mesa_glsl_error(& loc, state,
6490 "`demote' may only appear in a fragment shader");
6491 }
6492
6493 instructions->push_tail(new(ctx) ir_demote);
6494
6495 return NULL;
6496 }
6497
6498
6499 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6500 ast_selection_statement::hir(exec_list *instructions,
6501 struct _mesa_glsl_parse_state *state)
6502 {
6503 void *ctx = state;
6504
6505 ir_rvalue *const condition = this->condition->hir(instructions, state);
6506
6507 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6508 *
6509 * "Any expression whose type evaluates to a Boolean can be used as the
6510 * conditional expression bool-expression. Vector types are not accepted
6511 * as the expression to if."
6512 *
6513 * The checks are separated so that higher quality diagnostics can be
6514 * generated for cases where both rules are violated.
6515 */
6516 if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
6517 YYLTYPE loc = this->condition->get_location();
6518
6519 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
6520 "boolean");
6521 }
6522
6523 ir_if *const stmt = new(ctx) ir_if(condition);
6524
6525 if (then_statement != NULL) {
6526 state->symbols->push_scope();
6527 then_statement->hir(& stmt->then_instructions, state);
6528 state->symbols->pop_scope();
6529 }
6530
6531 if (else_statement != NULL) {
6532 state->symbols->push_scope();
6533 else_statement->hir(& stmt->else_instructions, state);
6534 state->symbols->pop_scope();
6535 }
6536
6537 instructions->push_tail(stmt);
6538
6539 /* if-statements do not have r-values.
6540 */
6541 return NULL;
6542 }
6543
6544
6545 struct case_label {
6546 /** Value of the case label. */
6547 unsigned value;
6548
6549 /** Does this label occur after the default? */
6550 bool after_default;
6551
6552 /**
6553 * AST for the case label.
6554 *
6555 * This is only used to generate error messages for duplicate labels.
6556 */
6557 ast_expression *ast;
6558 };
6559
6560 /* Used for detection of duplicate case values, compare
6561 * given contents directly.
6562 */
6563 static bool
compare_case_value(const void * a,const void * b)6564 compare_case_value(const void *a, const void *b)
6565 {
6566 return ((struct case_label *) a)->value == ((struct case_label *) b)->value;
6567 }
6568
6569
6570 /* Used for detection of duplicate case values, just
6571 * returns key contents as is.
6572 */
6573 static unsigned
key_contents(const void * key)6574 key_contents(const void *key)
6575 {
6576 return ((struct case_label *) key)->value;
6577 }
6578
6579
6580 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6581 ast_switch_statement::hir(exec_list *instructions,
6582 struct _mesa_glsl_parse_state *state)
6583 {
6584 void *ctx = state;
6585
6586 ir_rvalue *const test_expression =
6587 this->test_expression->hir(instructions, state);
6588
6589 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6590 *
6591 * "The type of init-expression in a switch statement must be a
6592 * scalar integer."
6593 */
6594 if (!test_expression->type->is_scalar() ||
6595 !test_expression->type->is_integer_32()) {
6596 YYLTYPE loc = this->test_expression->get_location();
6597
6598 _mesa_glsl_error(& loc,
6599 state,
6600 "switch-statement expression must be scalar "
6601 "integer");
6602 return NULL;
6603 }
6604
6605 /* Track the switch-statement nesting in a stack-like manner.
6606 */
6607 struct glsl_switch_state saved = state->switch_state;
6608
6609 state->switch_state.is_switch_innermost = true;
6610 state->switch_state.switch_nesting_ast = this;
6611 state->switch_state.labels_ht =
6612 _mesa_hash_table_create(NULL, key_contents,
6613 compare_case_value);
6614 state->switch_state.previous_default = NULL;
6615
6616 /* Initalize is_fallthru state to false.
6617 */
6618 ir_rvalue *const is_fallthru_val = new (ctx) ir_constant(false);
6619 state->switch_state.is_fallthru_var =
6620 new(ctx) ir_variable(glsl_type::bool_type,
6621 "switch_is_fallthru_tmp",
6622 ir_var_temporary);
6623 instructions->push_tail(state->switch_state.is_fallthru_var);
6624
6625 ir_dereference_variable *deref_is_fallthru_var =
6626 new(ctx) ir_dereference_variable(state->switch_state.is_fallthru_var);
6627 instructions->push_tail(new(ctx) ir_assignment(deref_is_fallthru_var,
6628 is_fallthru_val));
6629
6630 /* Initialize is_break state to false.
6631 */
6632 ir_rvalue *const is_break_val = new (ctx) ir_constant(false);
6633 state->switch_state.is_break_var =
6634 new(ctx) ir_variable(glsl_type::bool_type,
6635 "switch_is_break_tmp",
6636 ir_var_temporary);
6637 instructions->push_tail(state->switch_state.is_break_var);
6638
6639 ir_dereference_variable *deref_is_break_var =
6640 new(ctx) ir_dereference_variable(state->switch_state.is_break_var);
6641 instructions->push_tail(new(ctx) ir_assignment(deref_is_break_var,
6642 is_break_val));
6643
6644 state->switch_state.run_default =
6645 new(ctx) ir_variable(glsl_type::bool_type,
6646 "run_default_tmp",
6647 ir_var_temporary);
6648 instructions->push_tail(state->switch_state.run_default);
6649
6650 /* Cache test expression.
6651 */
6652 test_to_hir(instructions, state);
6653
6654 /* Emit code for body of switch stmt.
6655 */
6656 body->hir(instructions, state);
6657
6658 _mesa_hash_table_destroy(state->switch_state.labels_ht, NULL);
6659
6660 state->switch_state = saved;
6661
6662 /* Switch statements do not have r-values. */
6663 return NULL;
6664 }
6665
6666
6667 void
test_to_hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6668 ast_switch_statement::test_to_hir(exec_list *instructions,
6669 struct _mesa_glsl_parse_state *state)
6670 {
6671 void *ctx = state;
6672
6673 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6674 * on the switch test case. The first one would be already raised when
6675 * getting the test_expression at ast_switch_statement::hir
6676 */
6677 test_expression->set_is_lhs(true);
6678 /* Cache value of test expression. */
6679 ir_rvalue *const test_val = test_expression->hir(instructions, state);
6680
6681 state->switch_state.test_var = new(ctx) ir_variable(test_val->type,
6682 "switch_test_tmp",
6683 ir_var_temporary);
6684 ir_dereference_variable *deref_test_var =
6685 new(ctx) ir_dereference_variable(state->switch_state.test_var);
6686
6687 instructions->push_tail(state->switch_state.test_var);
6688 instructions->push_tail(new(ctx) ir_assignment(deref_test_var, test_val));
6689 }
6690
6691
6692 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6693 ast_switch_body::hir(exec_list *instructions,
6694 struct _mesa_glsl_parse_state *state)
6695 {
6696 if (stmts != NULL)
6697 stmts->hir(instructions, state);
6698
6699 /* Switch bodies do not have r-values. */
6700 return NULL;
6701 }
6702
6703 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6704 ast_case_statement_list::hir(exec_list *instructions,
6705 struct _mesa_glsl_parse_state *state)
6706 {
6707 exec_list default_case, after_default, tmp;
6708
6709 foreach_list_typed (ast_case_statement, case_stmt, link, & this->cases) {
6710 case_stmt->hir(&tmp, state);
6711
6712 /* Default case. */
6713 if (state->switch_state.previous_default && default_case.is_empty()) {
6714 default_case.append_list(&tmp);
6715 continue;
6716 }
6717
6718 /* If default case found, append 'after_default' list. */
6719 if (!default_case.is_empty())
6720 after_default.append_list(&tmp);
6721 else
6722 instructions->append_list(&tmp);
6723 }
6724
6725 /* Handle the default case. This is done here because default might not be
6726 * the last case. We need to add checks against following cases first to see
6727 * if default should be chosen or not.
6728 */
6729 if (!default_case.is_empty()) {
6730 ir_factory body(instructions, state);
6731
6732 ir_expression *cmp = NULL;
6733
6734 hash_table_foreach(state->switch_state.labels_ht, entry) {
6735 const struct case_label *const l = (struct case_label *) entry->data;
6736
6737 /* If the switch init-value is the value of one of the labels that
6738 * occurs after the default case, disable execution of the default
6739 * case.
6740 */
6741 if (l->after_default) {
6742 ir_constant *const cnst =
6743 state->switch_state.test_var->type->base_type == GLSL_TYPE_UINT
6744 ? body.constant(unsigned(l->value))
6745 : body.constant(int(l->value));
6746
6747 cmp = cmp == NULL
6748 ? equal(cnst, state->switch_state.test_var)
6749 : logic_or(cmp, equal(cnst, state->switch_state.test_var));
6750 }
6751 }
6752
6753 if (cmp != NULL)
6754 body.emit(assign(state->switch_state.run_default, logic_not(cmp)));
6755 else
6756 body.emit(assign(state->switch_state.run_default, body.constant(true)));
6757
6758 /* Append default case and all cases after it. */
6759 instructions->append_list(&default_case);
6760 instructions->append_list(&after_default);
6761 }
6762
6763 /* Case statements do not have r-values. */
6764 return NULL;
6765 }
6766
6767 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6768 ast_case_statement::hir(exec_list *instructions,
6769 struct _mesa_glsl_parse_state *state)
6770 {
6771 labels->hir(instructions, state);
6772
6773 /* Conditionally set fallthru state based on break state. */
6774 ir_constant *const false_val = new(state) ir_constant(false);
6775 ir_dereference_variable *const deref_is_fallthru_var =
6776 new(state) ir_dereference_variable(state->switch_state.is_fallthru_var);
6777 ir_dereference_variable *const deref_is_break_var =
6778 new(state) ir_dereference_variable(state->switch_state.is_break_var);
6779 ir_assignment *const reset_fallthru_on_break =
6780 new(state) ir_assignment(deref_is_fallthru_var,
6781 false_val,
6782 deref_is_break_var);
6783 instructions->push_tail(reset_fallthru_on_break);
6784
6785 /* Guard case statements depending on fallthru state. */
6786 ir_dereference_variable *const deref_fallthru_guard =
6787 new(state) ir_dereference_variable(state->switch_state.is_fallthru_var);
6788 ir_if *const test_fallthru = new(state) ir_if(deref_fallthru_guard);
6789
6790 foreach_list_typed (ast_node, stmt, link, & this->stmts)
6791 stmt->hir(& test_fallthru->then_instructions, state);
6792
6793 instructions->push_tail(test_fallthru);
6794
6795 /* Case statements do not have r-values. */
6796 return NULL;
6797 }
6798
6799
6800 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6801 ast_case_label_list::hir(exec_list *instructions,
6802 struct _mesa_glsl_parse_state *state)
6803 {
6804 foreach_list_typed (ast_case_label, label, link, & this->labels)
6805 label->hir(instructions, state);
6806
6807 /* Case labels do not have r-values. */
6808 return NULL;
6809 }
6810
6811 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6812 ast_case_label::hir(exec_list *instructions,
6813 struct _mesa_glsl_parse_state *state)
6814 {
6815 ir_factory body(instructions, state);
6816
6817 ir_variable *const fallthru_var = state->switch_state.is_fallthru_var;
6818
6819 /* If not default case, ... */
6820 if (this->test_value != NULL) {
6821 /* Conditionally set fallthru state based on
6822 * comparison of cached test expression value to case label.
6823 */
6824 ir_rvalue *const label_rval = this->test_value->hir(instructions, state);
6825 ir_constant *label_const =
6826 label_rval->constant_expression_value(body.mem_ctx);
6827
6828 if (!label_const) {
6829 YYLTYPE loc = this->test_value->get_location();
6830
6831 _mesa_glsl_error(& loc, state,
6832 "switch statement case label must be a "
6833 "constant expression");
6834
6835 /* Stuff a dummy value in to allow processing to continue. */
6836 label_const = body.constant(0);
6837 } else {
6838 hash_entry *entry =
6839 _mesa_hash_table_search(state->switch_state.labels_ht,
6840 &label_const->value.u[0]);
6841
6842 if (entry) {
6843 const struct case_label *const l =
6844 (struct case_label *) entry->data;
6845 const ast_expression *const previous_label = l->ast;
6846 YYLTYPE loc = this->test_value->get_location();
6847
6848 _mesa_glsl_error(& loc, state, "duplicate case value");
6849
6850 loc = previous_label->get_location();
6851 _mesa_glsl_error(& loc, state, "this is the previous case label");
6852 } else {
6853 struct case_label *l = ralloc(state->switch_state.labels_ht,
6854 struct case_label);
6855
6856 l->value = label_const->value.u[0];
6857 l->after_default = state->switch_state.previous_default != NULL;
6858 l->ast = this->test_value;
6859
6860 _mesa_hash_table_insert(state->switch_state.labels_ht,
6861 &label_const->value.u[0],
6862 l);
6863 }
6864 }
6865
6866 /* Create an r-value version of the ir_constant label here (after we may
6867 * have created a fake one in error cases) that can be passed to
6868 * apply_implicit_conversion below.
6869 */
6870 ir_rvalue *label = label_const;
6871
6872 ir_rvalue *deref_test_var =
6873 new(body.mem_ctx) ir_dereference_variable(state->switch_state.test_var);
6874
6875 /*
6876 * From GLSL 4.40 specification section 6.2 ("Selection"):
6877 *
6878 * "The type of the init-expression value in a switch statement must
6879 * be a scalar int or uint. The type of the constant-expression value
6880 * in a case label also must be a scalar int or uint. When any pair
6881 * of these values is tested for "equal value" and the types do not
6882 * match, an implicit conversion will be done to convert the int to a
6883 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6884 * is done."
6885 */
6886 if (label->type != state->switch_state.test_var->type) {
6887 YYLTYPE loc = this->test_value->get_location();
6888
6889 const glsl_type *type_a = label->type;
6890 const glsl_type *type_b = state->switch_state.test_var->type;
6891
6892 /* Check if int->uint implicit conversion is supported. */
6893 bool integer_conversion_supported =
6894 glsl_type::int_type->can_implicitly_convert_to(glsl_type::uint_type,
6895 state);
6896
6897 if ((!type_a->is_integer_32() || !type_b->is_integer_32()) ||
6898 !integer_conversion_supported) {
6899 _mesa_glsl_error(&loc, state, "type mismatch with switch "
6900 "init-expression and case label (%s != %s)",
6901 type_a->name, type_b->name);
6902 } else {
6903 /* Conversion of the case label. */
6904 if (type_a->base_type == GLSL_TYPE_INT) {
6905 if (!apply_implicit_conversion(glsl_type::uint_type,
6906 label, state))
6907 _mesa_glsl_error(&loc, state, "implicit type conversion error");
6908 } else {
6909 /* Conversion of the init-expression value. */
6910 if (!apply_implicit_conversion(glsl_type::uint_type,
6911 deref_test_var, state))
6912 _mesa_glsl_error(&loc, state, "implicit type conversion error");
6913 }
6914 }
6915
6916 /* If the implicit conversion was allowed, the types will already be
6917 * the same. If the implicit conversion wasn't allowed, smash the
6918 * type of the label anyway. This will prevent the expression
6919 * constructor (below) from failing an assertion.
6920 */
6921 label->type = deref_test_var->type;
6922 }
6923
6924 body.emit(assign(fallthru_var,
6925 logic_or(fallthru_var, equal(label, deref_test_var))));
6926 } else { /* default case */
6927 if (state->switch_state.previous_default) {
6928 YYLTYPE loc = this->get_location();
6929 _mesa_glsl_error(& loc, state,
6930 "multiple default labels in one switch");
6931
6932 loc = state->switch_state.previous_default->get_location();
6933 _mesa_glsl_error(& loc, state, "this is the first default label");
6934 }
6935 state->switch_state.previous_default = this;
6936
6937 /* Set fallthru condition on 'run_default' bool. */
6938 body.emit(assign(fallthru_var,
6939 logic_or(fallthru_var,
6940 state->switch_state.run_default)));
6941 }
6942
6943 /* Case statements do not have r-values. */
6944 return NULL;
6945 }
6946
6947 void
condition_to_hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6948 ast_iteration_statement::condition_to_hir(exec_list *instructions,
6949 struct _mesa_glsl_parse_state *state)
6950 {
6951 void *ctx = state;
6952
6953 if (condition != NULL) {
6954 ir_rvalue *const cond =
6955 condition->hir(instructions, state);
6956
6957 if ((cond == NULL)
6958 || !cond->type->is_boolean() || !cond->type->is_scalar()) {
6959 YYLTYPE loc = condition->get_location();
6960
6961 _mesa_glsl_error(& loc, state,
6962 "loop condition must be scalar boolean");
6963 } else {
6964 /* As the first code in the loop body, generate a block that looks
6965 * like 'if (!condition) break;' as the loop termination condition.
6966 */
6967 ir_rvalue *const not_cond =
6968 new(ctx) ir_expression(ir_unop_logic_not, cond);
6969
6970 ir_if *const if_stmt = new(ctx) ir_if(not_cond);
6971
6972 ir_jump *const break_stmt =
6973 new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
6974
6975 if_stmt->then_instructions.push_tail(break_stmt);
6976 instructions->push_tail(if_stmt);
6977 }
6978 }
6979 }
6980
6981
6982 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)6983 ast_iteration_statement::hir(exec_list *instructions,
6984 struct _mesa_glsl_parse_state *state)
6985 {
6986 void *ctx = state;
6987
6988 /* For-loops and while-loops start a new scope, but do-while loops do not.
6989 */
6990 if (mode != ast_do_while)
6991 state->symbols->push_scope();
6992
6993 if (init_statement != NULL)
6994 init_statement->hir(instructions, state);
6995
6996 ir_loop *const stmt = new(ctx) ir_loop();
6997 instructions->push_tail(stmt);
6998
6999 /* Track the current loop nesting. */
7000 ast_iteration_statement *nesting_ast = state->loop_nesting_ast;
7001
7002 state->loop_nesting_ast = this;
7003
7004 /* Likewise, indicate that following code is closest to a loop,
7005 * NOT closest to a switch.
7006 */
7007 bool saved_is_switch_innermost = state->switch_state.is_switch_innermost;
7008 state->switch_state.is_switch_innermost = false;
7009
7010 if (mode != ast_do_while)
7011 condition_to_hir(&stmt->body_instructions, state);
7012
7013 if (body != NULL)
7014 body->hir(& stmt->body_instructions, state);
7015
7016 if (rest_expression != NULL)
7017 rest_expression->hir(& stmt->body_instructions, state);
7018
7019 if (mode == ast_do_while)
7020 condition_to_hir(&stmt->body_instructions, state);
7021
7022 if (mode != ast_do_while)
7023 state->symbols->pop_scope();
7024
7025 /* Restore previous nesting before returning. */
7026 state->loop_nesting_ast = nesting_ast;
7027 state->switch_state.is_switch_innermost = saved_is_switch_innermost;
7028
7029 /* Loops do not have r-values.
7030 */
7031 return NULL;
7032 }
7033
7034
7035 /**
7036 * Determine if the given type is valid for establishing a default precision
7037 * qualifier.
7038 *
7039 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
7040 *
7041 * "The precision statement
7042 *
7043 * precision precision-qualifier type;
7044 *
7045 * can be used to establish a default precision qualifier. The type field
7046 * can be either int or float or any of the sampler types, and the
7047 * precision-qualifier can be lowp, mediump, or highp."
7048 *
7049 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
7050 * qualifiers on sampler types, but this seems like an oversight (since the
7051 * intention of including these in GLSL 1.30 is to allow compatibility with ES
7052 * shaders). So we allow int, float, and all sampler types regardless of GLSL
7053 * version.
7054 */
7055 static bool
is_valid_default_precision_type(const struct glsl_type * const type)7056 is_valid_default_precision_type(const struct glsl_type *const type)
7057 {
7058 if (type == NULL)
7059 return false;
7060
7061 switch (type->base_type) {
7062 case GLSL_TYPE_INT:
7063 case GLSL_TYPE_FLOAT:
7064 /* "int" and "float" are valid, but vectors and matrices are not. */
7065 return type->vector_elements == 1 && type->matrix_columns == 1;
7066 case GLSL_TYPE_SAMPLER:
7067 case GLSL_TYPE_IMAGE:
7068 case GLSL_TYPE_ATOMIC_UINT:
7069 return true;
7070 default:
7071 return false;
7072 }
7073 }
7074
7075
7076 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)7077 ast_type_specifier::hir(exec_list *instructions,
7078 struct _mesa_glsl_parse_state *state)
7079 {
7080 if (this->default_precision == ast_precision_none && this->structure == NULL)
7081 return NULL;
7082
7083 YYLTYPE loc = this->get_location();
7084
7085 /* If this is a precision statement, check that the type to which it is
7086 * applied is either float or int.
7087 *
7088 * From section 4.5.3 of the GLSL 1.30 spec:
7089 * "The precision statement
7090 * precision precision-qualifier type;
7091 * can be used to establish a default precision qualifier. The type
7092 * field can be either int or float [...]. Any other types or
7093 * qualifiers will result in an error.
7094 */
7095 if (this->default_precision != ast_precision_none) {
7096 if (!state->check_precision_qualifiers_allowed(&loc))
7097 return NULL;
7098
7099 if (this->structure != NULL) {
7100 _mesa_glsl_error(&loc, state,
7101 "precision qualifiers do not apply to structures");
7102 return NULL;
7103 }
7104
7105 if (this->array_specifier != NULL) {
7106 _mesa_glsl_error(&loc, state,
7107 "default precision statements do not apply to "
7108 "arrays");
7109 return NULL;
7110 }
7111
7112 const struct glsl_type *const type =
7113 state->symbols->get_type(this->type_name);
7114 if (!is_valid_default_precision_type(type)) {
7115 _mesa_glsl_error(&loc, state,
7116 "default precision statements apply only to "
7117 "float, int, and opaque types");
7118 return NULL;
7119 }
7120
7121 if (state->es_shader) {
7122 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
7123 * spec says:
7124 *
7125 * "Non-precision qualified declarations will use the precision
7126 * qualifier specified in the most recent precision statement
7127 * that is still in scope. The precision statement has the same
7128 * scoping rules as variable declarations. If it is declared
7129 * inside a compound statement, its effect stops at the end of
7130 * the innermost statement it was declared in. Precision
7131 * statements in nested scopes override precision statements in
7132 * outer scopes. Multiple precision statements for the same basic
7133 * type can appear inside the same scope, with later statements
7134 * overriding earlier statements within that scope."
7135 *
7136 * Default precision specifications follow the same scope rules as
7137 * variables. So, we can track the state of the default precision
7138 * qualifiers in the symbol table, and the rules will just work. This
7139 * is a slight abuse of the symbol table, but it has the semantics
7140 * that we want.
7141 */
7142 state->symbols->add_default_precision_qualifier(this->type_name,
7143 this->default_precision);
7144 }
7145
7146 {
7147 void *ctx = state;
7148
7149 const char* precision_type = NULL;
7150 switch (this->default_precision) {
7151 case GLSL_PRECISION_HIGH:
7152 precision_type = "highp";
7153 break;
7154 case GLSL_PRECISION_MEDIUM:
7155 precision_type = "mediump";
7156 break;
7157 case GLSL_PRECISION_LOW:
7158 precision_type = "lowp";
7159 break;
7160 case GLSL_PRECISION_NONE:
7161 precision_type = "";
7162 break;
7163 }
7164
7165 char* precision_statement = ralloc_asprintf(ctx, "precision %s %s", precision_type, this->type_name);
7166 ir_precision_statement *const stmt = new(ctx) ir_precision_statement(precision_statement);
7167
7168 instructions->push_head(stmt);
7169 }
7170
7171 return NULL;
7172 }
7173
7174 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
7175 * process_record_constructor() can do type-checking on C-style initializer
7176 * expressions of structs, but ast_struct_specifier should only be translated
7177 * to HIR if it is declaring the type of a structure.
7178 *
7179 * The ->is_declaration field is false for initializers of variables
7180 * declared separately from the struct's type definition.
7181 *
7182 * struct S { ... }; (is_declaration = true)
7183 * struct T { ... } t = { ... }; (is_declaration = true)
7184 * S s = { ... }; (is_declaration = false)
7185 */
7186 if (this->structure != NULL && this->structure->is_declaration)
7187 return this->structure->hir(instructions, state);
7188
7189 return NULL;
7190 }
7191
7192
7193 /**
7194 * Process a structure or interface block tree into an array of structure fields
7195 *
7196 * After parsing, where there are some syntax differnces, structures and
7197 * interface blocks are almost identical. They are similar enough that the
7198 * AST for each can be processed the same way into a set of
7199 * \c glsl_struct_field to describe the members.
7200 *
7201 * If we're processing an interface block, var_mode should be the type of the
7202 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7203 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7204 * ir_var_auto.
7205 *
7206 * \return
7207 * The number of fields processed. A pointer to the array structure fields is
7208 * stored in \c *fields_ret.
7209 */
7210 static unsigned
ast_process_struct_or_iface_block_members(exec_list * instructions,struct _mesa_glsl_parse_state * state,exec_list * declarations,glsl_struct_field ** fields_ret,bool is_interface,enum glsl_matrix_layout matrix_layout,bool allow_reserved_names,ir_variable_mode var_mode,ast_type_qualifier * layout,unsigned block_stream,unsigned block_xfb_buffer,unsigned block_xfb_offset,unsigned expl_location,unsigned expl_align)7211 ast_process_struct_or_iface_block_members(exec_list *instructions,
7212 struct _mesa_glsl_parse_state *state,
7213 exec_list *declarations,
7214 glsl_struct_field **fields_ret,
7215 bool is_interface,
7216 enum glsl_matrix_layout matrix_layout,
7217 bool allow_reserved_names,
7218 ir_variable_mode var_mode,
7219 ast_type_qualifier *layout,
7220 unsigned block_stream,
7221 unsigned block_xfb_buffer,
7222 unsigned block_xfb_offset,
7223 unsigned expl_location,
7224 unsigned expl_align)
7225 {
7226 unsigned decl_count = 0;
7227 unsigned next_offset = 0;
7228
7229 /* Make an initial pass over the list of fields to determine how
7230 * many there are. Each element in this list is an ast_declarator_list.
7231 * This means that we actually need to count the number of elements in the
7232 * 'declarations' list in each of the elements.
7233 */
7234 foreach_list_typed (ast_declarator_list, decl_list, link, declarations) {
7235 decl_count += decl_list->declarations.length();
7236 }
7237
7238 /* Allocate storage for the fields and process the field
7239 * declarations. As the declarations are processed, try to also convert
7240 * the types to HIR. This ensures that structure definitions embedded in
7241 * other structure definitions or in interface blocks are processed.
7242 */
7243 glsl_struct_field *const fields = rzalloc_array(state, glsl_struct_field,
7244 decl_count);
7245
7246 bool first_member = true;
7247 bool first_member_has_explicit_location = false;
7248
7249 unsigned i = 0;
7250 foreach_list_typed (ast_declarator_list, decl_list, link, declarations) {
7251 const char *type_name;
7252 YYLTYPE loc = decl_list->get_location();
7253
7254 decl_list->type->specifier->hir(instructions, state);
7255
7256 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7257 *
7258 * "Anonymous structures are not supported; so embedded structures
7259 * must have a declarator. A name given to an embedded struct is
7260 * scoped at the same level as the struct it is embedded in."
7261 *
7262 * The same section of the GLSL 1.20 spec says:
7263 *
7264 * "Anonymous structures are not supported. Embedded structures are
7265 * not supported."
7266 *
7267 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7268 * embedded structures in 1.10 only.
7269 */
7270 if (state->language_version != 110 &&
7271 decl_list->type->specifier->structure != NULL)
7272 _mesa_glsl_error(&loc, state,
7273 "embedded structure declarations are not allowed");
7274
7275 const glsl_type *decl_type =
7276 decl_list->type->glsl_type(& type_name, state);
7277
7278 const struct ast_type_qualifier *const qual =
7279 &decl_list->type->qualifier;
7280
7281 /* From section 4.3.9 of the GLSL 4.40 spec:
7282 *
7283 * "[In interface blocks] opaque types are not allowed."
7284 *
7285 * It should be impossible for decl_type to be NULL here. Cases that
7286 * might naturally lead to decl_type being NULL, especially for the
7287 * is_interface case, will have resulted in compilation having
7288 * already halted due to a syntax error.
7289 */
7290 assert(decl_type);
7291
7292 if (is_interface) {
7293 /* From section 4.3.7 of the ARB_bindless_texture spec:
7294 *
7295 * "(remove the following bullet from the last list on p. 39,
7296 * thereby permitting sampler types in interface blocks; image
7297 * types are also permitted in blocks by this extension)"
7298 *
7299 * * sampler types are not allowed
7300 */
7301 if (decl_type->contains_atomic() ||
7302 (!state->has_bindless() && decl_type->contains_opaque())) {
7303 _mesa_glsl_error(&loc, state, "uniform/buffer in non-default "
7304 "interface block contains %s variable",
7305 state->has_bindless() ? "atomic" : "opaque");
7306 }
7307 } else {
7308 if (decl_type->contains_atomic()) {
7309 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7310 *
7311 * "Members of structures cannot be declared as atomic counter
7312 * types."
7313 */
7314 _mesa_glsl_error(&loc, state, "atomic counter in structure");
7315 }
7316
7317 if (!state->has_bindless() && decl_type->contains_image()) {
7318 /* FINISHME: Same problem as with atomic counters.
7319 * FINISHME: Request clarification from Khronos and add
7320 * FINISHME: spec quotation here.
7321 */
7322 _mesa_glsl_error(&loc, state, "image in structure");
7323 }
7324 }
7325
7326 if (qual->flags.q.explicit_binding) {
7327 _mesa_glsl_error(&loc, state,
7328 "binding layout qualifier cannot be applied "
7329 "to struct or interface block members");
7330 }
7331
7332 if (is_interface) {
7333 if (!first_member) {
7334 if (!layout->flags.q.explicit_location &&
7335 ((first_member_has_explicit_location &&
7336 !qual->flags.q.explicit_location) ||
7337 (!first_member_has_explicit_location &&
7338 qual->flags.q.explicit_location))) {
7339 _mesa_glsl_error(&loc, state,
7340 "when block-level location layout qualifier "
7341 "is not supplied either all members must "
7342 "have a location layout qualifier or all "
7343 "members must not have a location layout "
7344 "qualifier");
7345 }
7346 } else {
7347 first_member = false;
7348 first_member_has_explicit_location =
7349 qual->flags.q.explicit_location;
7350 }
7351 }
7352
7353 if (qual->flags.q.std140 ||
7354 qual->flags.q.std430 ||
7355 qual->flags.q.packed ||
7356 qual->flags.q.shared) {
7357 _mesa_glsl_error(&loc, state,
7358 "uniform/shader storage block layout qualifiers "
7359 "std140, std430, packed, and shared can only be "
7360 "applied to uniform/shader storage blocks, not "
7361 "members");
7362 }
7363
7364 if (qual->flags.q.constant) {
7365 _mesa_glsl_error(&loc, state,
7366 "const storage qualifier cannot be applied "
7367 "to struct or interface block members");
7368 }
7369
7370 validate_memory_qualifier_for_type(state, &loc, qual, decl_type);
7371 validate_image_format_qualifier_for_type(state, &loc, qual, decl_type);
7372
7373 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7374 *
7375 * "A block member may be declared with a stream identifier, but
7376 * the specified stream must match the stream associated with the
7377 * containing block."
7378 */
7379 if (qual->flags.q.explicit_stream) {
7380 unsigned qual_stream;
7381 if (process_qualifier_constant(state, &loc, "stream",
7382 qual->stream, &qual_stream) &&
7383 qual_stream != block_stream) {
7384 _mesa_glsl_error(&loc, state, "stream layout qualifier on "
7385 "interface block member does not match "
7386 "the interface block (%u vs %u)", qual_stream,
7387 block_stream);
7388 }
7389 }
7390
7391 int xfb_buffer;
7392 unsigned explicit_xfb_buffer = 0;
7393 if (qual->flags.q.explicit_xfb_buffer) {
7394 unsigned qual_xfb_buffer;
7395 if (process_qualifier_constant(state, &loc, "xfb_buffer",
7396 qual->xfb_buffer, &qual_xfb_buffer)) {
7397 explicit_xfb_buffer = 1;
7398 if (qual_xfb_buffer != block_xfb_buffer)
7399 _mesa_glsl_error(&loc, state, "xfb_buffer layout qualifier on "
7400 "interface block member does not match "
7401 "the interface block (%u vs %u)",
7402 qual_xfb_buffer, block_xfb_buffer);
7403 }
7404 xfb_buffer = (int) qual_xfb_buffer;
7405 } else {
7406 if (layout)
7407 explicit_xfb_buffer = layout->flags.q.explicit_xfb_buffer;
7408 xfb_buffer = (int) block_xfb_buffer;
7409 }
7410
7411 int xfb_stride = -1;
7412 if (qual->flags.q.explicit_xfb_stride) {
7413 unsigned qual_xfb_stride;
7414 if (process_qualifier_constant(state, &loc, "xfb_stride",
7415 qual->xfb_stride, &qual_xfb_stride)) {
7416 xfb_stride = (int) qual_xfb_stride;
7417 }
7418 }
7419
7420 if (qual->flags.q.uniform && qual->has_interpolation()) {
7421 _mesa_glsl_error(&loc, state,
7422 "interpolation qualifiers cannot be used "
7423 "with uniform interface blocks");
7424 }
7425
7426 if ((qual->flags.q.uniform || !is_interface) &&
7427 qual->has_auxiliary_storage()) {
7428 _mesa_glsl_error(&loc, state,
7429 "auxiliary storage qualifiers cannot be used "
7430 "in uniform blocks or structures.");
7431 }
7432
7433 if (qual->flags.q.row_major || qual->flags.q.column_major) {
7434 if (!qual->flags.q.uniform && !qual->flags.q.buffer) {
7435 _mesa_glsl_error(&loc, state,
7436 "row_major and column_major can only be "
7437 "applied to interface blocks");
7438 } else
7439 validate_matrix_layout_for_type(state, &loc, decl_type, NULL);
7440 }
7441
7442 foreach_list_typed (ast_declaration, decl, link,
7443 &decl_list->declarations) {
7444 YYLTYPE loc = decl->get_location();
7445
7446 if (!allow_reserved_names)
7447 validate_identifier(decl->identifier, loc, state);
7448
7449 const struct glsl_type *field_type =
7450 process_array_type(&loc, decl_type, decl->array_specifier, state);
7451 validate_array_dimensions(field_type, state, &loc);
7452 fields[i].type = field_type;
7453 fields[i].name = decl->identifier;
7454 fields[i].interpolation =
7455 interpret_interpolation_qualifier(qual, field_type,
7456 var_mode, state, &loc);
7457 fields[i].centroid = qual->flags.q.centroid ? 1 : 0;
7458 fields[i].sample = qual->flags.q.sample ? 1 : 0;
7459 fields[i].patch = qual->flags.q.patch ? 1 : 0;
7460 fields[i].offset = -1;
7461 fields[i].explicit_xfb_buffer = explicit_xfb_buffer;
7462 fields[i].xfb_buffer = xfb_buffer;
7463 fields[i].xfb_stride = xfb_stride;
7464
7465 if (qual->flags.q.explicit_location) {
7466 unsigned qual_location;
7467 if (process_qualifier_constant(state, &loc, "location",
7468 qual->location, &qual_location)) {
7469 fields[i].location = qual_location +
7470 (fields[i].patch ? VARYING_SLOT_PATCH0 : VARYING_SLOT_VAR0);
7471 expl_location = fields[i].location +
7472 fields[i].type->count_attribute_slots(false);
7473 }
7474 } else {
7475 if (layout && layout->flags.q.explicit_location) {
7476 fields[i].location = expl_location;
7477 expl_location += fields[i].type->count_attribute_slots(false);
7478 } else {
7479 fields[i].location = -1;
7480 }
7481 }
7482
7483 /* Offset can only be used with std430 and std140 layouts an initial
7484 * value of 0 is used for error detection.
7485 */
7486 unsigned align = 0;
7487 unsigned size = 0;
7488 if (layout) {
7489 bool row_major;
7490 if (qual->flags.q.row_major ||
7491 matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR) {
7492 row_major = true;
7493 } else {
7494 row_major = false;
7495 }
7496
7497 if(layout->flags.q.std140) {
7498 align = field_type->std140_base_alignment(row_major);
7499 size = field_type->std140_size(row_major);
7500 } else if (layout->flags.q.std430) {
7501 align = field_type->std430_base_alignment(row_major);
7502 size = field_type->std430_size(row_major);
7503 }
7504 }
7505
7506 if (qual->flags.q.explicit_offset) {
7507 unsigned qual_offset;
7508 if (process_qualifier_constant(state, &loc, "offset",
7509 qual->offset, &qual_offset)) {
7510 if (align != 0 && size != 0) {
7511 if (next_offset > qual_offset)
7512 _mesa_glsl_error(&loc, state, "layout qualifier "
7513 "offset overlaps previous member");
7514
7515 if (qual_offset % align) {
7516 _mesa_glsl_error(&loc, state, "layout qualifier offset "
7517 "must be a multiple of the base "
7518 "alignment of %s", field_type->name);
7519 }
7520 fields[i].offset = qual_offset;
7521 next_offset = qual_offset + size;
7522 } else {
7523 _mesa_glsl_error(&loc, state, "offset can only be used "
7524 "with std430 and std140 layouts");
7525 }
7526 }
7527 }
7528
7529 if (qual->flags.q.explicit_align || expl_align != 0) {
7530 unsigned offset = fields[i].offset != -1 ? fields[i].offset :
7531 next_offset;
7532 if (align == 0 || size == 0) {
7533 _mesa_glsl_error(&loc, state, "align can only be used with "
7534 "std430 and std140 layouts");
7535 } else if (qual->flags.q.explicit_align) {
7536 unsigned member_align;
7537 if (process_qualifier_constant(state, &loc, "align",
7538 qual->align, &member_align)) {
7539 if (member_align == 0 ||
7540 member_align & (member_align - 1)) {
7541 _mesa_glsl_error(&loc, state, "align layout qualifier "
7542 "is not a power of 2");
7543 } else {
7544 fields[i].offset = glsl_align(offset, member_align);
7545 next_offset = fields[i].offset + size;
7546 }
7547 }
7548 } else {
7549 fields[i].offset = glsl_align(offset, expl_align);
7550 next_offset = fields[i].offset + size;
7551 }
7552 } else if (!qual->flags.q.explicit_offset) {
7553 if (align != 0 && size != 0)
7554 next_offset = glsl_align(next_offset, align) + size;
7555 }
7556
7557 /* From the ARB_enhanced_layouts spec:
7558 *
7559 * "The given offset applies to the first component of the first
7560 * member of the qualified entity. Then, within the qualified
7561 * entity, subsequent components are each assigned, in order, to
7562 * the next available offset aligned to a multiple of that
7563 * component's size. Aggregate types are flattened down to the
7564 * component level to get this sequence of components."
7565 */
7566 if (qual->flags.q.explicit_xfb_offset) {
7567 unsigned xfb_offset;
7568 if (process_qualifier_constant(state, &loc, "xfb_offset",
7569 qual->offset, &xfb_offset)) {
7570 fields[i].offset = xfb_offset;
7571 block_xfb_offset = fields[i].offset +
7572 4 * field_type->component_slots();
7573 }
7574 } else {
7575 if (layout && layout->flags.q.explicit_xfb_offset) {
7576 unsigned align = field_type->is_64bit() ? 8 : 4;
7577 fields[i].offset = glsl_align(block_xfb_offset, align);
7578 block_xfb_offset += 4 * field_type->component_slots();
7579 }
7580 }
7581
7582 /* Propogate row- / column-major information down the fields of the
7583 * structure or interface block. Structures need this data because
7584 * the structure may contain a structure that contains ... a matrix
7585 * that need the proper layout.
7586 */
7587 if (is_interface && layout &&
7588 (layout->flags.q.uniform || layout->flags.q.buffer) &&
7589 (field_type->without_array()->is_matrix()
7590 || field_type->without_array()->is_struct())) {
7591 /* If no layout is specified for the field, inherit the layout
7592 * from the block.
7593 */
7594 fields[i].matrix_layout = matrix_layout;
7595
7596 if (qual->flags.q.row_major)
7597 fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR;
7598 else if (qual->flags.q.column_major)
7599 fields[i].matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR;
7600
7601 /* If we're processing an uniform or buffer block, the matrix
7602 * layout must be decided by this point.
7603 */
7604 assert(fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_ROW_MAJOR
7605 || fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_COLUMN_MAJOR);
7606 }
7607
7608 /* Memory qualifiers are allowed on buffer and image variables, while
7609 * the format qualifier is only accepted for images.
7610 */
7611 if (var_mode == ir_var_shader_storage ||
7612 field_type->without_array()->is_image()) {
7613 /* For readonly and writeonly qualifiers the field definition,
7614 * if set, overwrites the layout qualifier.
7615 */
7616 if (qual->flags.q.read_only || qual->flags.q.write_only) {
7617 fields[i].memory_read_only = qual->flags.q.read_only;
7618 fields[i].memory_write_only = qual->flags.q.write_only;
7619 } else {
7620 fields[i].memory_read_only =
7621 layout ? layout->flags.q.read_only : 0;
7622 fields[i].memory_write_only =
7623 layout ? layout->flags.q.write_only : 0;
7624 }
7625
7626 /* For other qualifiers, we set the flag if either the layout
7627 * qualifier or the field qualifier are set
7628 */
7629 fields[i].memory_coherent = qual->flags.q.coherent ||
7630 (layout && layout->flags.q.coherent);
7631 fields[i].memory_volatile = qual->flags.q._volatile ||
7632 (layout && layout->flags.q._volatile);
7633 fields[i].memory_restrict = qual->flags.q.restrict_flag ||
7634 (layout && layout->flags.q.restrict_flag);
7635
7636 if (field_type->without_array()->is_image()) {
7637 if (qual->flags.q.explicit_image_format) {
7638 if (qual->image_base_type !=
7639 field_type->without_array()->sampled_type) {
7640 _mesa_glsl_error(&loc, state, "format qualifier doesn't "
7641 "match the base data type of the image");
7642 }
7643
7644 fields[i].image_format = qual->image_format;
7645 } else {
7646 if (!qual->flags.q.write_only) {
7647 _mesa_glsl_error(&loc, state, "image not qualified with "
7648 "`writeonly' must have a format layout "
7649 "qualifier");
7650 }
7651
7652 fields[i].image_format = GL_NONE;
7653 }
7654 }
7655 }
7656
7657 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
7658 if (state->es_shader) {
7659 fields[i].precision = select_gles_precision(qual->precision,
7660 field_type,
7661 state,
7662 &loc);
7663 } else {
7664 fields[i].precision = qual->precision;
7665 }
7666
7667 i++;
7668 }
7669 }
7670
7671 assert(i == decl_count);
7672
7673 *fields_ret = fields;
7674 return decl_count;
7675 }
7676
7677
7678 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)7679 ast_struct_specifier::hir(exec_list *instructions,
7680 struct _mesa_glsl_parse_state *state)
7681 {
7682 YYLTYPE loc = this->get_location();
7683
7684 unsigned expl_location = 0;
7685 if (layout && layout->flags.q.explicit_location) {
7686 if (!process_qualifier_constant(state, &loc, "location",
7687 layout->location, &expl_location)) {
7688 return NULL;
7689 } else {
7690 expl_location = VARYING_SLOT_VAR0 + expl_location;
7691 }
7692 }
7693
7694 glsl_struct_field *fields;
7695 unsigned decl_count =
7696 ast_process_struct_or_iface_block_members(instructions,
7697 state,
7698 &this->declarations,
7699 &fields,
7700 false,
7701 GLSL_MATRIX_LAYOUT_INHERITED,
7702 false /* allow_reserved_names */,
7703 ir_var_auto,
7704 layout,
7705 0, /* for interface only */
7706 0, /* for interface only */
7707 0, /* for interface only */
7708 expl_location,
7709 0 /* for interface only */);
7710
7711 validate_identifier(this->name, loc, state);
7712
7713 type = glsl_type::get_struct_instance(fields, decl_count, this->name);
7714
7715 if (!type->is_anonymous() && !state->symbols->add_type(name, type)) {
7716 const glsl_type *match = state->symbols->get_type(name);
7717 /* allow struct matching for desktop GL - older UE4 does this */
7718 if (match != NULL && state->is_version(130, 0) && match->record_compare(type, true, false))
7719 _mesa_glsl_warning(& loc, state, "struct `%s' previously defined", name);
7720 else
7721 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
7722 } else {
7723 const glsl_type **s = reralloc(state, state->user_structures,
7724 const glsl_type *,
7725 state->num_user_structures + 1);
7726 if (s != NULL) {
7727 s[state->num_user_structures] = type;
7728 state->user_structures = s;
7729 state->num_user_structures++;
7730
7731 ir_typedecl_statement* stmt = new(state) ir_typedecl_statement(type);
7732 /* Push the struct declarations to the top.
7733 * However, do not insert declarations before default precision
7734 * statements or other declarations
7735 */
7736 ir_instruction* before_node = (ir_instruction*)instructions->get_head();
7737 while (before_node &&
7738 (before_node->ir_type == ir_type_precision ||
7739 before_node->ir_type == ir_type_typedecl))
7740 before_node = (ir_instruction*)before_node->next;
7741 if (before_node)
7742 before_node->insert_before(stmt);
7743 else
7744 instructions->push_head(stmt);
7745 }
7746 }
7747
7748 /* Structure type definitions do not have r-values.
7749 */
7750 return NULL;
7751 }
7752
7753
7754 /**
7755 * Visitor class which detects whether a given interface block has been used.
7756 */
7757 class interface_block_usage_visitor : public ir_hierarchical_visitor
7758 {
7759 public:
interface_block_usage_visitor(ir_variable_mode mode,const glsl_type * block)7760 interface_block_usage_visitor(ir_variable_mode mode, const glsl_type *block)
7761 : mode(mode), block(block), found(false)
7762 {
7763 }
7764
visit(ir_dereference_variable * ir)7765 virtual ir_visitor_status visit(ir_dereference_variable *ir)
7766 {
7767 if (ir->var->data.mode == mode && ir->var->get_interface_type() == block) {
7768 found = true;
7769 return visit_stop;
7770 }
7771 return visit_continue;
7772 }
7773
usage_found() const7774 bool usage_found() const
7775 {
7776 return this->found;
7777 }
7778
7779 private:
7780 ir_variable_mode mode;
7781 const glsl_type *block;
7782 bool found;
7783 };
7784
7785 static bool
is_unsized_array_last_element(ir_variable * v)7786 is_unsized_array_last_element(ir_variable *v)
7787 {
7788 const glsl_type *interface_type = v->get_interface_type();
7789 int length = interface_type->length;
7790
7791 assert(v->type->is_unsized_array());
7792
7793 /* Check if it is the last element of the interface */
7794 if (strcmp(interface_type->fields.structure[length-1].name, v->name) == 0)
7795 return true;
7796 return false;
7797 }
7798
7799 static void
apply_memory_qualifiers(ir_variable * var,glsl_struct_field field)7800 apply_memory_qualifiers(ir_variable *var, glsl_struct_field field)
7801 {
7802 var->data.memory_read_only = field.memory_read_only;
7803 var->data.memory_write_only = field.memory_write_only;
7804 var->data.memory_coherent = field.memory_coherent;
7805 var->data.memory_volatile = field.memory_volatile;
7806 var->data.memory_restrict = field.memory_restrict;
7807 }
7808
7809 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)7810 ast_interface_block::hir(exec_list *instructions,
7811 struct _mesa_glsl_parse_state *state)
7812 {
7813 YYLTYPE loc = this->get_location();
7814
7815 /* Interface blocks must be declared at global scope */
7816 if (state->current_function != NULL) {
7817 _mesa_glsl_error(&loc, state,
7818 "Interface block `%s' must be declared "
7819 "at global scope",
7820 this->block_name);
7821 }
7822
7823 /* Validate qualifiers:
7824 *
7825 * - Layout Qualifiers as per the table in Section 4.4
7826 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7827 *
7828 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7829 * GLSL 4.50 spec:
7830 *
7831 * "Additionally, memory qualifiers may also be used in the declaration
7832 * of shader storage blocks"
7833 *
7834 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7835 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7836 * Layout Qualifiers) of the GLSL 4.50 spec says:
7837 *
7838 * "The std430 qualifier is supported only for shader storage blocks;
7839 * using std430 on a uniform block will result in a compile-time error."
7840 */
7841 ast_type_qualifier allowed_blk_qualifiers;
7842 allowed_blk_qualifiers.flags.i = 0;
7843 if (this->layout.flags.q.buffer || this->layout.flags.q.uniform) {
7844 allowed_blk_qualifiers.flags.q.shared = 1;
7845 allowed_blk_qualifiers.flags.q.packed = 1;
7846 allowed_blk_qualifiers.flags.q.std140 = 1;
7847 allowed_blk_qualifiers.flags.q.row_major = 1;
7848 allowed_blk_qualifiers.flags.q.column_major = 1;
7849 allowed_blk_qualifiers.flags.q.explicit_align = 1;
7850 allowed_blk_qualifiers.flags.q.explicit_binding = 1;
7851 if (this->layout.flags.q.buffer) {
7852 allowed_blk_qualifiers.flags.q.buffer = 1;
7853 allowed_blk_qualifiers.flags.q.std430 = 1;
7854 allowed_blk_qualifiers.flags.q.coherent = 1;
7855 allowed_blk_qualifiers.flags.q._volatile = 1;
7856 allowed_blk_qualifiers.flags.q.restrict_flag = 1;
7857 allowed_blk_qualifiers.flags.q.read_only = 1;
7858 allowed_blk_qualifiers.flags.q.write_only = 1;
7859 } else {
7860 allowed_blk_qualifiers.flags.q.uniform = 1;
7861 }
7862 } else {
7863 /* Interface block */
7864 assert(this->layout.flags.q.in || this->layout.flags.q.out);
7865
7866 allowed_blk_qualifiers.flags.q.explicit_location = 1;
7867 if (this->layout.flags.q.out) {
7868 allowed_blk_qualifiers.flags.q.out = 1;
7869 if (state->stage == MESA_SHADER_GEOMETRY ||
7870 state->stage == MESA_SHADER_TESS_CTRL ||
7871 state->stage == MESA_SHADER_TESS_EVAL ||
7872 state->stage == MESA_SHADER_VERTEX ) {
7873 allowed_blk_qualifiers.flags.q.explicit_xfb_offset = 1;
7874 allowed_blk_qualifiers.flags.q.explicit_xfb_buffer = 1;
7875 allowed_blk_qualifiers.flags.q.xfb_buffer = 1;
7876 allowed_blk_qualifiers.flags.q.explicit_xfb_stride = 1;
7877 allowed_blk_qualifiers.flags.q.xfb_stride = 1;
7878 if (state->stage == MESA_SHADER_GEOMETRY) {
7879 allowed_blk_qualifiers.flags.q.stream = 1;
7880 allowed_blk_qualifiers.flags.q.explicit_stream = 1;
7881 }
7882 if (state->stage == MESA_SHADER_TESS_CTRL) {
7883 allowed_blk_qualifiers.flags.q.patch = 1;
7884 }
7885 }
7886 } else {
7887 allowed_blk_qualifiers.flags.q.in = 1;
7888 if (state->stage == MESA_SHADER_TESS_EVAL) {
7889 allowed_blk_qualifiers.flags.q.patch = 1;
7890 }
7891 }
7892 }
7893
7894 this->layout.validate_flags(&loc, state, allowed_blk_qualifiers,
7895 "invalid qualifier for block",
7896 this->block_name);
7897
7898 enum glsl_interface_packing packing;
7899 if (this->layout.flags.q.std140) {
7900 packing = GLSL_INTERFACE_PACKING_STD140;
7901 } else if (this->layout.flags.q.packed) {
7902 packing = GLSL_INTERFACE_PACKING_PACKED;
7903 } else if (this->layout.flags.q.std430) {
7904 packing = GLSL_INTERFACE_PACKING_STD430;
7905 } else {
7906 /* The default layout is shared.
7907 */
7908 packing = GLSL_INTERFACE_PACKING_SHARED;
7909 }
7910
7911 ir_variable_mode var_mode;
7912 const char *iface_type_name;
7913 if (this->layout.flags.q.in) {
7914 var_mode = ir_var_shader_in;
7915 iface_type_name = "in";
7916 } else if (this->layout.flags.q.out) {
7917 var_mode = ir_var_shader_out;
7918 iface_type_name = "out";
7919 } else if (this->layout.flags.q.uniform) {
7920 var_mode = ir_var_uniform;
7921 iface_type_name = "uniform";
7922 } else if (this->layout.flags.q.buffer) {
7923 var_mode = ir_var_shader_storage;
7924 iface_type_name = "buffer";
7925 } else {
7926 var_mode = ir_var_auto;
7927 iface_type_name = "UNKNOWN";
7928 assert(!"interface block layout qualifier not found!");
7929 }
7930
7931 enum glsl_matrix_layout matrix_layout = GLSL_MATRIX_LAYOUT_INHERITED;
7932 if (this->layout.flags.q.row_major)
7933 matrix_layout = GLSL_MATRIX_LAYOUT_ROW_MAJOR;
7934 else if (this->layout.flags.q.column_major)
7935 matrix_layout = GLSL_MATRIX_LAYOUT_COLUMN_MAJOR;
7936
7937 bool redeclaring_per_vertex = strcmp(this->block_name, "gl_PerVertex") == 0;
7938 exec_list declared_variables;
7939 glsl_struct_field *fields;
7940
7941 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7942 * that we don't have incompatible qualifiers
7943 */
7944 if (this->layout.flags.q.read_only && this->layout.flags.q.write_only) {
7945 _mesa_glsl_error(&loc, state,
7946 "Interface block sets both readonly and writeonly");
7947 }
7948
7949 unsigned qual_stream;
7950 if (!process_qualifier_constant(state, &loc, "stream", this->layout.stream,
7951 &qual_stream) ||
7952 !validate_stream_qualifier(&loc, state, qual_stream)) {
7953 /* If the stream qualifier is invalid it doesn't make sense to continue
7954 * on and try to compare stream layouts on member variables against it
7955 * so just return early.
7956 */
7957 return NULL;
7958 }
7959
7960 unsigned qual_xfb_buffer;
7961 if (!process_qualifier_constant(state, &loc, "xfb_buffer",
7962 layout.xfb_buffer, &qual_xfb_buffer) ||
7963 !validate_xfb_buffer_qualifier(&loc, state, qual_xfb_buffer)) {
7964 return NULL;
7965 }
7966
7967 unsigned qual_xfb_offset;
7968 if (layout.flags.q.explicit_xfb_offset) {
7969 if (!process_qualifier_constant(state, &loc, "xfb_offset",
7970 layout.offset, &qual_xfb_offset)) {
7971 return NULL;
7972 }
7973 }
7974
7975 unsigned qual_xfb_stride;
7976 if (layout.flags.q.explicit_xfb_stride) {
7977 if (!process_qualifier_constant(state, &loc, "xfb_stride",
7978 layout.xfb_stride, &qual_xfb_stride)) {
7979 return NULL;
7980 }
7981 }
7982
7983 unsigned expl_location = 0;
7984 if (layout.flags.q.explicit_location) {
7985 if (!process_qualifier_constant(state, &loc, "location",
7986 layout.location, &expl_location)) {
7987 return NULL;
7988 } else {
7989 expl_location += this->layout.flags.q.patch ? VARYING_SLOT_PATCH0
7990 : VARYING_SLOT_VAR0;
7991 }
7992 }
7993
7994 unsigned expl_align = 0;
7995 if (layout.flags.q.explicit_align) {
7996 if (!process_qualifier_constant(state, &loc, "align",
7997 layout.align, &expl_align)) {
7998 return NULL;
7999 } else {
8000 if (expl_align == 0 || expl_align & (expl_align - 1)) {
8001 _mesa_glsl_error(&loc, state, "align layout qualifier is not a "
8002 "power of 2.");
8003 return NULL;
8004 }
8005 }
8006 }
8007
8008 unsigned int num_variables =
8009 ast_process_struct_or_iface_block_members(&declared_variables,
8010 state,
8011 &this->declarations,
8012 &fields,
8013 true,
8014 matrix_layout,
8015 redeclaring_per_vertex,
8016 var_mode,
8017 &this->layout,
8018 qual_stream,
8019 qual_xfb_buffer,
8020 qual_xfb_offset,
8021 expl_location,
8022 expl_align);
8023
8024 if (!redeclaring_per_vertex) {
8025 validate_identifier(this->block_name, loc, state);
8026
8027 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
8028 *
8029 * "Block names have no other use within a shader beyond interface
8030 * matching; it is a compile-time error to use a block name at global
8031 * scope for anything other than as a block name."
8032 */
8033 ir_variable *var = state->symbols->get_variable(this->block_name);
8034 if (var && !var->type->is_interface()) {
8035 _mesa_glsl_error(&loc, state, "Block name `%s' is "
8036 "already used in the scope.",
8037 this->block_name);
8038 }
8039 }
8040
8041 const glsl_type *earlier_per_vertex = NULL;
8042 if (redeclaring_per_vertex) {
8043 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
8044 * the named interface block gl_in, we can find it by looking at the
8045 * previous declaration of gl_in. Otherwise we can find it by looking
8046 * at the previous decalartion of any of the built-in outputs,
8047 * e.g. gl_Position.
8048 *
8049 * Also check that the instance name and array-ness of the redeclaration
8050 * are correct.
8051 */
8052 switch (var_mode) {
8053 case ir_var_shader_in:
8054 if (ir_variable *earlier_gl_in =
8055 state->symbols->get_variable("gl_in")) {
8056 earlier_per_vertex = earlier_gl_in->get_interface_type();
8057 } else {
8058 _mesa_glsl_error(&loc, state,
8059 "redeclaration of gl_PerVertex input not allowed "
8060 "in the %s shader",
8061 _mesa_shader_stage_to_string(state->stage));
8062 }
8063 if (this->instance_name == NULL ||
8064 strcmp(this->instance_name, "gl_in") != 0 || this->array_specifier == NULL ||
8065 !this->array_specifier->is_single_dimension()) {
8066 _mesa_glsl_error(&loc, state,
8067 "gl_PerVertex input must be redeclared as "
8068 "gl_in[]");
8069 }
8070 break;
8071 case ir_var_shader_out:
8072 if (ir_variable *earlier_gl_Position =
8073 state->symbols->get_variable("gl_Position")) {
8074 earlier_per_vertex = earlier_gl_Position->get_interface_type();
8075 } else if (ir_variable *earlier_gl_out =
8076 state->symbols->get_variable("gl_out")) {
8077 earlier_per_vertex = earlier_gl_out->get_interface_type();
8078 } else {
8079 _mesa_glsl_error(&loc, state,
8080 "redeclaration of gl_PerVertex output not "
8081 "allowed in the %s shader",
8082 _mesa_shader_stage_to_string(state->stage));
8083 }
8084 if (state->stage == MESA_SHADER_TESS_CTRL) {
8085 if (this->instance_name == NULL ||
8086 strcmp(this->instance_name, "gl_out") != 0 || this->array_specifier == NULL) {
8087 _mesa_glsl_error(&loc, state,
8088 "gl_PerVertex output must be redeclared as "
8089 "gl_out[]");
8090 }
8091 } else {
8092 if (this->instance_name != NULL) {
8093 _mesa_glsl_error(&loc, state,
8094 "gl_PerVertex output may not be redeclared with "
8095 "an instance name");
8096 }
8097 }
8098 break;
8099 default:
8100 _mesa_glsl_error(&loc, state,
8101 "gl_PerVertex must be declared as an input or an "
8102 "output");
8103 break;
8104 }
8105
8106 if (earlier_per_vertex == NULL) {
8107 /* An error has already been reported. Bail out to avoid null
8108 * dereferences later in this function.
8109 */
8110 return NULL;
8111 }
8112
8113 /* Copy locations from the old gl_PerVertex interface block. */
8114 for (unsigned i = 0; i < num_variables; i++) {
8115 int j = earlier_per_vertex->field_index(fields[i].name);
8116 if (j == -1) {
8117 _mesa_glsl_error(&loc, state,
8118 "redeclaration of gl_PerVertex must be a subset "
8119 "of the built-in members of gl_PerVertex");
8120 } else {
8121 fields[i].location =
8122 earlier_per_vertex->fields.structure[j].location;
8123 fields[i].offset =
8124 earlier_per_vertex->fields.structure[j].offset;
8125 fields[i].interpolation =
8126 earlier_per_vertex->fields.structure[j].interpolation;
8127 fields[i].centroid =
8128 earlier_per_vertex->fields.structure[j].centroid;
8129 fields[i].sample =
8130 earlier_per_vertex->fields.structure[j].sample;
8131 fields[i].patch =
8132 earlier_per_vertex->fields.structure[j].patch;
8133 fields[i].precision =
8134 earlier_per_vertex->fields.structure[j].precision;
8135 fields[i].explicit_xfb_buffer =
8136 earlier_per_vertex->fields.structure[j].explicit_xfb_buffer;
8137 fields[i].xfb_buffer =
8138 earlier_per_vertex->fields.structure[j].xfb_buffer;
8139 fields[i].xfb_stride =
8140 earlier_per_vertex->fields.structure[j].xfb_stride;
8141 }
8142 }
8143
8144 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
8145 * spec:
8146 *
8147 * If a built-in interface block is redeclared, it must appear in
8148 * the shader before any use of any member included in the built-in
8149 * declaration, or a compilation error will result.
8150 *
8151 * This appears to be a clarification to the behaviour established for
8152 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
8153 * regardless of GLSL version.
8154 */
8155 interface_block_usage_visitor v(var_mode, earlier_per_vertex);
8156 v.run(instructions);
8157 if (v.usage_found()) {
8158 _mesa_glsl_error(&loc, state,
8159 "redeclaration of a built-in interface block must "
8160 "appear before any use of any member of the "
8161 "interface block");
8162 }
8163 }
8164
8165 const glsl_type *block_type =
8166 glsl_type::get_interface_instance(fields,
8167 num_variables,
8168 packing,
8169 matrix_layout ==
8170 GLSL_MATRIX_LAYOUT_ROW_MAJOR,
8171 this->block_name);
8172
8173 unsigned component_size = block_type->contains_double() ? 8 : 4;
8174 int xfb_offset =
8175 layout.flags.q.explicit_xfb_offset ? (int) qual_xfb_offset : -1;
8176 validate_xfb_offset_qualifier(&loc, state, xfb_offset, block_type,
8177 component_size);
8178
8179 if (!state->symbols->add_interface(block_type->name, block_type, var_mode)) {
8180 YYLTYPE loc = this->get_location();
8181 _mesa_glsl_error(&loc, state, "interface block `%s' with type `%s' "
8182 "already taken in the current scope",
8183 this->block_name, iface_type_name);
8184 }
8185
8186 /* Since interface blocks cannot contain statements, it should be
8187 * impossible for the block to generate any instructions.
8188 */
8189 assert(declared_variables.is_empty());
8190
8191 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
8192 *
8193 * Geometry shader input variables get the per-vertex values written
8194 * out by vertex shader output variables of the same names. Since a
8195 * geometry shader operates on a set of vertices, each input varying
8196 * variable (or input block, see interface blocks below) needs to be
8197 * declared as an array.
8198 */
8199 if (state->stage == MESA_SHADER_GEOMETRY && this->array_specifier == NULL &&
8200 var_mode == ir_var_shader_in) {
8201 _mesa_glsl_error(&loc, state, "geometry shader inputs must be arrays");
8202 } else if ((state->stage == MESA_SHADER_TESS_CTRL ||
8203 state->stage == MESA_SHADER_TESS_EVAL) &&
8204 !this->layout.flags.q.patch &&
8205 this->array_specifier == NULL &&
8206 var_mode == ir_var_shader_in) {
8207 _mesa_glsl_error(&loc, state, "per-vertex tessellation shader inputs must be arrays");
8208 } else if (state->stage == MESA_SHADER_TESS_CTRL &&
8209 !this->layout.flags.q.patch &&
8210 this->array_specifier == NULL &&
8211 var_mode == ir_var_shader_out) {
8212 _mesa_glsl_error(&loc, state, "tessellation control shader outputs must be arrays");
8213 }
8214
8215
8216 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8217 * says:
8218 *
8219 * "If an instance name (instance-name) is used, then it puts all the
8220 * members inside a scope within its own name space, accessed with the
8221 * field selector ( . ) operator (analogously to structures)."
8222 */
8223 if (this->instance_name) {
8224 if (redeclaring_per_vertex) {
8225 /* When a built-in in an unnamed interface block is redeclared,
8226 * get_variable_being_redeclared() calls
8227 * check_builtin_array_max_size() to make sure that built-in array
8228 * variables aren't redeclared to illegal sizes. But we're looking
8229 * at a redeclaration of a named built-in interface block. So we
8230 * have to manually call check_builtin_array_max_size() for all parts
8231 * of the interface that are arrays.
8232 */
8233 for (unsigned i = 0; i < num_variables; i++) {
8234 if (fields[i].type->is_array()) {
8235 const unsigned size = fields[i].type->array_size();
8236 check_builtin_array_max_size(fields[i].name, size, loc, state);
8237 }
8238 }
8239 } else {
8240 validate_identifier(this->instance_name, loc, state);
8241 }
8242
8243 ir_variable *var;
8244
8245 if (this->array_specifier != NULL) {
8246 const glsl_type *block_array_type =
8247 process_array_type(&loc, block_type, this->array_specifier, state);
8248
8249 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8250 *
8251 * For uniform blocks declared an array, each individual array
8252 * element corresponds to a separate buffer object backing one
8253 * instance of the block. As the array size indicates the number
8254 * of buffer objects needed, uniform block array declarations
8255 * must specify an array size.
8256 *
8257 * And a few paragraphs later:
8258 *
8259 * Geometry shader input blocks must be declared as arrays and
8260 * follow the array declaration and linking rules for all
8261 * geometry shader inputs. All other input and output block
8262 * arrays must specify an array size.
8263 *
8264 * The same applies to tessellation shaders.
8265 *
8266 * The upshot of this is that the only circumstance where an
8267 * interface array size *doesn't* need to be specified is on a
8268 * geometry shader input, tessellation control shader input,
8269 * tessellation control shader output, and tessellation evaluation
8270 * shader input.
8271 */
8272 if (block_array_type->is_unsized_array()) {
8273 bool allow_inputs = state->stage == MESA_SHADER_GEOMETRY ||
8274 state->stage == MESA_SHADER_TESS_CTRL ||
8275 state->stage == MESA_SHADER_TESS_EVAL;
8276 bool allow_outputs = state->stage == MESA_SHADER_TESS_CTRL;
8277
8278 if (this->layout.flags.q.in) {
8279 if (!allow_inputs)
8280 _mesa_glsl_error(&loc, state,
8281 "unsized input block arrays not allowed in "
8282 "%s shader",
8283 _mesa_shader_stage_to_string(state->stage));
8284 } else if (this->layout.flags.q.out) {
8285 if (!allow_outputs)
8286 _mesa_glsl_error(&loc, state,
8287 "unsized output block arrays not allowed in "
8288 "%s shader",
8289 _mesa_shader_stage_to_string(state->stage));
8290 } else {
8291 /* by elimination, this is a uniform block array */
8292 _mesa_glsl_error(&loc, state,
8293 "unsized uniform block arrays not allowed in "
8294 "%s shader",
8295 _mesa_shader_stage_to_string(state->stage));
8296 }
8297 }
8298
8299 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8300 *
8301 * * Arrays of arrays of blocks are not allowed
8302 */
8303 if (state->es_shader && block_array_type->is_array() &&
8304 block_array_type->fields.array->is_array()) {
8305 _mesa_glsl_error(&loc, state,
8306 "arrays of arrays interface blocks are "
8307 "not allowed");
8308 }
8309
8310 var = new(state) ir_variable(block_array_type,
8311 this->instance_name,
8312 var_mode);
8313 } else {
8314 var = new(state) ir_variable(block_type,
8315 this->instance_name,
8316 var_mode);
8317 }
8318
8319 var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED
8320 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout;
8321
8322 if (var_mode == ir_var_shader_in || var_mode == ir_var_uniform)
8323 var->data.read_only = true;
8324
8325 var->data.patch = this->layout.flags.q.patch;
8326
8327 if (state->stage == MESA_SHADER_GEOMETRY && var_mode == ir_var_shader_in)
8328 handle_geometry_shader_input_decl(state, loc, var);
8329 else if ((state->stage == MESA_SHADER_TESS_CTRL ||
8330 state->stage == MESA_SHADER_TESS_EVAL) && var_mode == ir_var_shader_in)
8331 handle_tess_shader_input_decl(state, loc, var);
8332 else if (state->stage == MESA_SHADER_TESS_CTRL && var_mode == ir_var_shader_out)
8333 handle_tess_ctrl_shader_output_decl(state, loc, var);
8334
8335 for (unsigned i = 0; i < num_variables; i++) {
8336 if (var->data.mode == ir_var_shader_storage)
8337 apply_memory_qualifiers(var, fields[i]);
8338 }
8339
8340 if (ir_variable *earlier =
8341 state->symbols->get_variable(this->instance_name)) {
8342 if (!redeclaring_per_vertex) {
8343 _mesa_glsl_error(&loc, state, "`%s' redeclared",
8344 this->instance_name);
8345 }
8346 earlier->data.how_declared = ir_var_declared_normally;
8347 earlier->type = var->type;
8348 earlier->reinit_interface_type(block_type);
8349 delete var;
8350 } else {
8351 if (this->layout.flags.q.explicit_binding) {
8352 apply_explicit_binding(state, &loc, var, var->type,
8353 &this->layout);
8354 }
8355
8356 var->data.stream = qual_stream;
8357 if (layout.flags.q.explicit_location) {
8358 var->data.location = expl_location;
8359 var->data.explicit_location = true;
8360 }
8361
8362 state->symbols->add_variable(var);
8363 instructions->push_tail(var);
8364 }
8365 } else {
8366 /* In order to have an array size, the block must also be declared with
8367 * an instance name.
8368 */
8369 assert(this->array_specifier == NULL);
8370
8371 for (unsigned i = 0; i < num_variables; i++) {
8372 ir_variable *var =
8373 new(state) ir_variable(fields[i].type,
8374 ralloc_strdup(state, fields[i].name),
8375 var_mode);
8376 var->data.interpolation = fields[i].interpolation;
8377 var->data.centroid = fields[i].centroid;
8378 var->data.sample = fields[i].sample;
8379 var->data.patch = fields[i].patch;
8380 var->data.stream = qual_stream;
8381 var->data.location = fields[i].location;
8382
8383 if (fields[i].location != -1)
8384 var->data.explicit_location = true;
8385
8386 var->data.explicit_xfb_buffer = fields[i].explicit_xfb_buffer;
8387 var->data.xfb_buffer = fields[i].xfb_buffer;
8388
8389 if (fields[i].offset != -1)
8390 var->data.explicit_xfb_offset = true;
8391 var->data.offset = fields[i].offset;
8392
8393 var->init_interface_type(block_type);
8394
8395 if (var_mode == ir_var_shader_in || var_mode == ir_var_uniform)
8396 var->data.read_only = true;
8397
8398 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8399 if (state->es_shader) {
8400 var->data.precision =
8401 select_gles_precision(fields[i].precision, fields[i].type,
8402 state, &loc);
8403 }
8404
8405 if (fields[i].matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED) {
8406 var->data.matrix_layout = matrix_layout == GLSL_MATRIX_LAYOUT_INHERITED
8407 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR : matrix_layout;
8408 } else {
8409 var->data.matrix_layout = fields[i].matrix_layout;
8410 }
8411
8412 if (var->data.mode == ir_var_shader_storage)
8413 apply_memory_qualifiers(var, fields[i]);
8414
8415 /* Examine var name here since var may get deleted in the next call */
8416 bool var_is_gl_id = is_gl_identifier(var->name);
8417
8418 if (redeclaring_per_vertex) {
8419 bool is_redeclaration;
8420 var =
8421 get_variable_being_redeclared(&var, loc, state,
8422 true /* allow_all_redeclarations */,
8423 &is_redeclaration);
8424 if (!var_is_gl_id || !is_redeclaration) {
8425 _mesa_glsl_error(&loc, state,
8426 "redeclaration of gl_PerVertex can only "
8427 "include built-in variables");
8428 } else if (var->data.how_declared == ir_var_declared_normally) {
8429 _mesa_glsl_error(&loc, state,
8430 "`%s' has already been redeclared",
8431 var->name);
8432 } else {
8433 var->data.how_declared = ir_var_declared_in_block;
8434 var->reinit_interface_type(block_type);
8435 }
8436 continue;
8437 }
8438
8439 if (state->symbols->get_variable(var->name) != NULL)
8440 _mesa_glsl_error(&loc, state, "`%s' redeclared", var->name);
8441
8442 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8443 * The UBO declaration itself doesn't get an ir_variable unless it
8444 * has an instance name. This is ugly.
8445 */
8446 if (this->layout.flags.q.explicit_binding) {
8447 apply_explicit_binding(state, &loc, var,
8448 var->get_interface_type(), &this->layout);
8449 }
8450
8451 if (var->type->is_unsized_array()) {
8452 if (var->is_in_shader_storage_block() &&
8453 is_unsized_array_last_element(var)) {
8454 var->data.from_ssbo_unsized_array = true;
8455 } else {
8456 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8457 *
8458 * "If an array is declared as the last member of a shader storage
8459 * block and the size is not specified at compile-time, it is
8460 * sized at run-time. In all other cases, arrays are sized only
8461 * at compile-time."
8462 *
8463 * In desktop GLSL it is allowed to have unsized-arrays that are
8464 * not last, as long as we can determine that they are implicitly
8465 * sized.
8466 */
8467 if (state->es_shader) {
8468 _mesa_glsl_error(&loc, state, "unsized array `%s' "
8469 "definition: only last member of a shader "
8470 "storage block can be defined as unsized "
8471 "array", fields[i].name);
8472 }
8473 }
8474 }
8475
8476 state->symbols->add_variable(var);
8477 instructions->push_tail(var);
8478 }
8479
8480 if (redeclaring_per_vertex && block_type != earlier_per_vertex) {
8481 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8482 *
8483 * It is also a compilation error ... to redeclare a built-in
8484 * block and then use a member from that built-in block that was
8485 * not included in the redeclaration.
8486 *
8487 * This appears to be a clarification to the behaviour established
8488 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8489 * behaviour regardless of GLSL version.
8490 *
8491 * To prevent the shader from using a member that was not included in
8492 * the redeclaration, we disable any ir_variables that are still
8493 * associated with the old declaration of gl_PerVertex (since we've
8494 * already updated all of the variables contained in the new
8495 * gl_PerVertex to point to it).
8496 *
8497 * As a side effect this will prevent
8498 * validate_intrastage_interface_blocks() from getting confused and
8499 * thinking there are conflicting definitions of gl_PerVertex in the
8500 * shader.
8501 */
8502 foreach_in_list_safe(ir_instruction, node, instructions) {
8503 ir_variable *const var = node->as_variable();
8504 if (var != NULL &&
8505 var->get_interface_type() == earlier_per_vertex &&
8506 var->data.mode == var_mode) {
8507 if (var->data.how_declared == ir_var_declared_normally) {
8508 _mesa_glsl_error(&loc, state,
8509 "redeclaration of gl_PerVertex cannot "
8510 "follow a redeclaration of `%s'",
8511 var->name);
8512 }
8513 state->symbols->disable_variable(var->name);
8514 var->remove();
8515 }
8516 }
8517 }
8518 }
8519
8520 return NULL;
8521 }
8522
8523
8524 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)8525 ast_tcs_output_layout::hir(exec_list *instructions,
8526 struct _mesa_glsl_parse_state *state)
8527 {
8528 YYLTYPE loc = this->get_location();
8529
8530 unsigned num_vertices;
8531 if (!state->out_qualifier->vertices->
8532 process_qualifier_constant(state, "vertices", &num_vertices,
8533 false)) {
8534 /* return here to stop cascading incorrect error messages */
8535 return NULL;
8536 }
8537
8538 /* If any shader outputs occurred before this declaration and specified an
8539 * array size, make sure the size they specified is consistent with the
8540 * primitive type.
8541 */
8542 if (state->tcs_output_size != 0 && state->tcs_output_size != num_vertices) {
8543 _mesa_glsl_error(&loc, state,
8544 "this tessellation control shader output layout "
8545 "specifies %u vertices, but a previous output "
8546 "is declared with size %u",
8547 num_vertices, state->tcs_output_size);
8548 return NULL;
8549 }
8550
8551 state->tcs_output_vertices_specified = true;
8552
8553 /* If any shader outputs occurred before this declaration and did not
8554 * specify an array size, their size is determined now.
8555 */
8556 foreach_in_list (ir_instruction, node, instructions) {
8557 ir_variable *var = node->as_variable();
8558 if (var == NULL || var->data.mode != ir_var_shader_out)
8559 continue;
8560
8561 /* Note: Not all tessellation control shader output are arrays. */
8562 if (!var->type->is_unsized_array() || var->data.patch)
8563 continue;
8564
8565 if (var->data.max_array_access >= (int)num_vertices) {
8566 _mesa_glsl_error(&loc, state,
8567 "this tessellation control shader output layout "
8568 "specifies %u vertices, but an access to element "
8569 "%u of output `%s' already exists", num_vertices,
8570 var->data.max_array_access, var->name);
8571 } else {
8572 var->type = glsl_type::get_array_instance(var->type->fields.array,
8573 num_vertices);
8574 }
8575 }
8576
8577 return NULL;
8578 }
8579
8580
8581 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)8582 ast_gs_input_layout::hir(exec_list *instructions,
8583 struct _mesa_glsl_parse_state *state)
8584 {
8585 YYLTYPE loc = this->get_location();
8586
8587 /* Should have been prevented by the parser. */
8588 assert(!state->gs_input_prim_type_specified
8589 || state->in_qualifier->prim_type == this->prim_type);
8590
8591 /* If any shader inputs occurred before this declaration and specified an
8592 * array size, make sure the size they specified is consistent with the
8593 * primitive type.
8594 */
8595 unsigned num_vertices = vertices_per_prim(this->prim_type);
8596 if (state->gs_input_size != 0 && state->gs_input_size != num_vertices) {
8597 _mesa_glsl_error(&loc, state,
8598 "this geometry shader input layout implies %u vertices"
8599 " per primitive, but a previous input is declared"
8600 " with size %u", num_vertices, state->gs_input_size);
8601 return NULL;
8602 }
8603
8604 state->gs_input_prim_type_specified = true;
8605
8606 /* If any shader inputs occurred before this declaration and did not
8607 * specify an array size, their size is determined now.
8608 */
8609 foreach_in_list(ir_instruction, node, instructions) {
8610 ir_variable *var = node->as_variable();
8611 if (var == NULL || var->data.mode != ir_var_shader_in)
8612 continue;
8613
8614 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8615 * array; skip it.
8616 */
8617
8618 if (var->type->is_unsized_array()) {
8619 if (var->data.max_array_access >= (int)num_vertices) {
8620 _mesa_glsl_error(&loc, state,
8621 "this geometry shader input layout implies %u"
8622 " vertices, but an access to element %u of input"
8623 " `%s' already exists", num_vertices,
8624 var->data.max_array_access, var->name);
8625 } else {
8626 var->type = glsl_type::get_array_instance(var->type->fields.array,
8627 num_vertices);
8628 }
8629 }
8630 }
8631
8632 return NULL;
8633 }
8634
8635
8636 ir_rvalue *
hir(exec_list * instructions,struct _mesa_glsl_parse_state * state)8637 ast_cs_input_layout::hir(exec_list *instructions,
8638 struct _mesa_glsl_parse_state *state)
8639 {
8640 YYLTYPE loc = this->get_location();
8641
8642 /* From the ARB_compute_shader specification:
8643 *
8644 * If the local size of the shader in any dimension is greater
8645 * than the maximum size supported by the implementation for that
8646 * dimension, a compile-time error results.
8647 *
8648 * It is not clear from the spec how the error should be reported if
8649 * the total size of the work group exceeds
8650 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8651 * report it at compile time as well.
8652 */
8653 GLuint64 total_invocations = 1;
8654 unsigned qual_local_size[3];
8655 for (int i = 0; i < 3; i++) {
8656
8657 char *local_size_str = ralloc_asprintf(NULL, "invalid local_size_%c",
8658 'x' + i);
8659 /* Infer a local_size of 1 for unspecified dimensions */
8660 if (this->local_size[i] == NULL) {
8661 qual_local_size[i] = 1;
8662 } else if (!this->local_size[i]->
8663 process_qualifier_constant(state, local_size_str,
8664 &qual_local_size[i], false)) {
8665 ralloc_free(local_size_str);
8666 return NULL;
8667 }
8668 ralloc_free(local_size_str);
8669
8670 if (qual_local_size[i] > state->ctx->Const.MaxComputeWorkGroupSize[i]) {
8671 _mesa_glsl_error(&loc, state,
8672 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8673 " (%d)", 'x' + i,
8674 state->ctx->Const.MaxComputeWorkGroupSize[i]);
8675 break;
8676 }
8677 total_invocations *= qual_local_size[i];
8678 if (total_invocations >
8679 state->ctx->Const.MaxComputeWorkGroupInvocations) {
8680 _mesa_glsl_error(&loc, state,
8681 "product of local_sizes exceeds "
8682 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8683 state->ctx->Const.MaxComputeWorkGroupInvocations);
8684 break;
8685 }
8686 }
8687
8688 /* If any compute input layout declaration preceded this one, make sure it
8689 * was consistent with this one.
8690 */
8691 if (state->cs_input_local_size_specified) {
8692 for (int i = 0; i < 3; i++) {
8693 if (state->cs_input_local_size[i] != qual_local_size[i]) {
8694 _mesa_glsl_error(&loc, state,
8695 "compute shader input layout does not match"
8696 " previous declaration");
8697 return NULL;
8698 }
8699 }
8700 }
8701
8702 /* The ARB_compute_variable_group_size spec says:
8703 *
8704 * If a compute shader including a *local_size_variable* qualifier also
8705 * declares a fixed local group size using the *local_size_x*,
8706 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8707 * results
8708 */
8709 if (state->cs_input_local_size_variable_specified) {
8710 _mesa_glsl_error(&loc, state,
8711 "compute shader can't include both a variable and a "
8712 "fixed local group size");
8713 return NULL;
8714 }
8715
8716 state->cs_input_local_size_specified = true;
8717 for (int i = 0; i < 3; i++)
8718 state->cs_input_local_size[i] = qual_local_size[i];
8719
8720 /* We may now declare the built-in constant gl_WorkGroupSize (see
8721 * builtin_variable_generator::generate_constants() for why we didn't
8722 * declare it earlier).
8723 */
8724 ir_variable *var = new(state->symbols)
8725 ir_variable(glsl_type::uvec3_type, "gl_WorkGroupSize", ir_var_auto);
8726 var->data.how_declared = ir_var_declared_implicitly;
8727 var->data.read_only = true;
8728 instructions->push_tail(var);
8729 state->symbols->add_variable(var);
8730 ir_constant_data data;
8731 memset(&data, 0, sizeof(data));
8732 for (int i = 0; i < 3; i++)
8733 data.u[i] = qual_local_size[i];
8734 var->constant_value = new(var) ir_constant(glsl_type::uvec3_type, &data);
8735 var->constant_initializer =
8736 new(var) ir_constant(glsl_type::uvec3_type, &data);
8737 var->data.has_initializer = true;
8738
8739 return NULL;
8740 }
8741
8742
8743 static void
detect_conflicting_assignments(struct _mesa_glsl_parse_state * state,exec_list * instructions)8744 detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
8745 exec_list *instructions)
8746 {
8747 bool gl_FragColor_assigned = false;
8748 bool gl_FragData_assigned = false;
8749 bool gl_FragSecondaryColor_assigned = false;
8750 bool gl_FragSecondaryData_assigned = false;
8751 bool user_defined_fs_output_assigned = false;
8752 ir_variable *user_defined_fs_output = NULL;
8753
8754 /* It would be nice to have proper location information. */
8755 YYLTYPE loc;
8756 memset(&loc, 0, sizeof(loc));
8757
8758 foreach_in_list(ir_instruction, node, instructions) {
8759 ir_variable *var = node->as_variable();
8760
8761 if (!var || !var->data.assigned)
8762 continue;
8763
8764 if (strcmp(var->name, "gl_FragColor") == 0)
8765 gl_FragColor_assigned = true;
8766 else if (strcmp(var->name, "gl_FragData") == 0)
8767 gl_FragData_assigned = true;
8768 else if (strcmp(var->name, "gl_SecondaryFragColorEXT") == 0)
8769 gl_FragSecondaryColor_assigned = true;
8770 else if (strcmp(var->name, "gl_SecondaryFragDataEXT") == 0)
8771 gl_FragSecondaryData_assigned = true;
8772 else if (!is_gl_identifier(var->name)) {
8773 if (state->stage == MESA_SHADER_FRAGMENT &&
8774 var->data.mode == ir_var_shader_out) {
8775 user_defined_fs_output_assigned = true;
8776 user_defined_fs_output = var;
8777 }
8778 }
8779 }
8780
8781 /* From the GLSL 1.30 spec:
8782 *
8783 * "If a shader statically assigns a value to gl_FragColor, it
8784 * may not assign a value to any element of gl_FragData. If a
8785 * shader statically writes a value to any element of
8786 * gl_FragData, it may not assign a value to
8787 * gl_FragColor. That is, a shader may assign values to either
8788 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8789 * linked together must also consistently write just one of
8790 * these variables. Similarly, if user declared output
8791 * variables are in use (statically assigned to), then the
8792 * built-in variables gl_FragColor and gl_FragData may not be
8793 * assigned to. These incorrect usages all generate compile
8794 * time errors."
8795 */
8796 if (gl_FragColor_assigned && gl_FragData_assigned) {
8797 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
8798 "`gl_FragColor' and `gl_FragData'");
8799 } else if (gl_FragColor_assigned && user_defined_fs_output_assigned) {
8800 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
8801 "`gl_FragColor' and `%s'",
8802 user_defined_fs_output->name);
8803 } else if (gl_FragSecondaryColor_assigned && gl_FragSecondaryData_assigned) {
8804 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
8805 "`gl_FragSecondaryColorEXT' and"
8806 " `gl_FragSecondaryDataEXT'");
8807 } else if (gl_FragColor_assigned && gl_FragSecondaryData_assigned) {
8808 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
8809 "`gl_FragColor' and"
8810 " `gl_FragSecondaryDataEXT'");
8811 } else if (gl_FragData_assigned && gl_FragSecondaryColor_assigned) {
8812 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
8813 "`gl_FragData' and"
8814 " `gl_FragSecondaryColorEXT'");
8815 } else if (gl_FragData_assigned && user_defined_fs_output_assigned) {
8816 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
8817 "`gl_FragData' and `%s'",
8818 user_defined_fs_output->name);
8819 }
8820
8821 if ((gl_FragSecondaryColor_assigned || gl_FragSecondaryData_assigned) &&
8822 !state->EXT_blend_func_extended_enable) {
8823 _mesa_glsl_error(&loc, state,
8824 "Dual source blending requires EXT_blend_func_extended");
8825 }
8826 }
8827
8828 static void
verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state * state)8829 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state *state)
8830 {
8831 YYLTYPE loc;
8832 memset(&loc, 0, sizeof(loc));
8833
8834 /* Section 6.1.2 (Subroutines) of the GLSL 4.00 spec says:
8835 *
8836 * "A program will fail to compile or link if any shader
8837 * or stage contains two or more functions with the same
8838 * name if the name is associated with a subroutine type."
8839 */
8840
8841 for (int i = 0; i < state->num_subroutines; i++) {
8842 unsigned definitions = 0;
8843 ir_function *fn = state->subroutines[i];
8844 /* Calculate number of function definitions with the same name */
8845 foreach_in_list(ir_function_signature, sig, &fn->signatures) {
8846 if (sig->is_defined) {
8847 if (++definitions > 1) {
8848 _mesa_glsl_error(&loc, state,
8849 "%s shader contains two or more function "
8850 "definitions with name `%s', which is "
8851 "associated with a subroutine type.\n",
8852 _mesa_shader_stage_to_string(state->stage),
8853 fn->name);
8854 return;
8855 }
8856 }
8857 }
8858 }
8859 }
8860
8861 static void
remove_per_vertex_blocks(exec_list * instructions,_mesa_glsl_parse_state * state,ir_variable_mode mode)8862 remove_per_vertex_blocks(exec_list *instructions,
8863 _mesa_glsl_parse_state *state, ir_variable_mode mode)
8864 {
8865 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8866 * if it exists in this shader type.
8867 */
8868 const glsl_type *per_vertex = NULL;
8869 switch (mode) {
8870 case ir_var_shader_in:
8871 if (ir_variable *gl_in = state->symbols->get_variable("gl_in"))
8872 per_vertex = gl_in->get_interface_type();
8873 break;
8874 case ir_var_shader_out:
8875 if (ir_variable *gl_Position =
8876 state->symbols->get_variable("gl_Position")) {
8877 per_vertex = gl_Position->get_interface_type();
8878 }
8879 break;
8880 default:
8881 assert(!"Unexpected mode");
8882 break;
8883 }
8884
8885 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8886 * need to do anything.
8887 */
8888 if (per_vertex == NULL)
8889 return;
8890
8891 /* If the interface block is used by the shader, then we don't need to do
8892 * anything.
8893 */
8894 interface_block_usage_visitor v(mode, per_vertex);
8895 v.run(instructions);
8896 if (v.usage_found())
8897 return;
8898
8899 /* Remove any ir_variable declarations that refer to the interface block
8900 * we're removing.
8901 */
8902 foreach_in_list_safe(ir_instruction, node, instructions) {
8903 ir_variable *const var = node->as_variable();
8904 if (var != NULL && var->get_interface_type() == per_vertex &&
8905 var->data.mode == mode) {
8906 state->symbols->disable_variable(var->name);
8907 var->remove();
8908 }
8909 }
8910 }
8911
8912 ir_rvalue *
hir(exec_list *,struct _mesa_glsl_parse_state * state)8913 ast_warnings_toggle::hir(exec_list *,
8914 struct _mesa_glsl_parse_state *state)
8915 {
8916 state->warnings_enabled = enable;
8917 return NULL;
8918 }
8919