1 /*
2 * This file is part of cparser.
3 * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
18 * 02111-1307, USA.
19 */
20 #include <config.h>
21
22 #include "ast_t.h"
23 #include "symbol_t.h"
24 #include "type_t.h"
25 #include "parser.h"
26 #include "lang_features.h"
27 #include "entity_t.h"
28 #include "printer.h"
29 #include "separator_t.h"
30 #include "types.h"
31
32 #include <assert.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <ctype.h>
36
37 #if defined(__INTEL_COMPILER)
38 #include <mathimf.h>
39 #elif defined(__CYGWIN__)
40 #include "win32/cygwin_math_ext.h"
41 #else
42 #include <math.h>
43 #endif
44
45 #include "adt/error.h"
46 #include "adt/util.h"
47
48 struct obstack ast_obstack;
49
50 static int indent;
51 static int case_indent;
52
53 bool print_implicit_casts = false;
54 bool print_parenthesis = false;
55
56 static void print_statement(const statement_t *statement);
57 static void print_expression_prec(const expression_t *expression, unsigned prec);
58
change_indent(int delta)59 void change_indent(int delta)
60 {
61 indent += delta;
62 assert(indent >= 0);
63 }
64
print_indent(void)65 void print_indent(void)
66 {
67 for (int i = 0; i < indent; ++i)
68 print_char('\t');
69 }
70
71 /**
72 * Returns 1 if a given precedence level has right-to-left
73 * associativity, else 0.
74 *
75 * @param precedence the operator precedence
76 */
right_to_left(unsigned precedence)77 static int right_to_left(unsigned precedence)
78 {
79 switch (precedence) {
80 case PREC_ASSIGNMENT:
81 case PREC_CONDITIONAL:
82 case PREC_UNARY:
83 return 1;
84
85 default:
86 return 0;
87 }
88 }
89
90 /**
91 * Return the precedence of an expression given by its kind.
92 *
93 * @param kind the expression kind
94 */
get_expression_precedence(expression_kind_t kind)95 static unsigned get_expression_precedence(expression_kind_t kind)
96 {
97 static const unsigned prec[] = {
98 [EXPR_ERROR] = PREC_PRIMARY,
99 [EXPR_REFERENCE] = PREC_PRIMARY,
100 [EXPR_ENUM_CONSTANT] = PREC_PRIMARY,
101 [EXPR_LITERAL_INTEGER] = PREC_PRIMARY,
102 [EXPR_LITERAL_FLOATINGPOINT] = PREC_PRIMARY,
103 [EXPR_LITERAL_CHARACTER] = PREC_PRIMARY,
104 [EXPR_LITERAL_MS_NOOP] = PREC_PRIMARY,
105 [EXPR_STRING_LITERAL] = PREC_PRIMARY,
106 [EXPR_COMPOUND_LITERAL] = PREC_UNARY,
107 [EXPR_CALL] = PREC_POSTFIX,
108 [EXPR_CONDITIONAL] = PREC_CONDITIONAL,
109 [EXPR_SELECT] = PREC_POSTFIX,
110 [EXPR_ARRAY_ACCESS] = PREC_POSTFIX,
111 [EXPR_SIZEOF] = PREC_UNARY,
112 [EXPR_CLASSIFY_TYPE] = PREC_UNARY,
113 [EXPR_ALIGNOF] = PREC_UNARY,
114
115 [EXPR_FUNCNAME] = PREC_PRIMARY,
116 [EXPR_BUILTIN_CONSTANT_P] = PREC_PRIMARY,
117 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = PREC_PRIMARY,
118 [EXPR_OFFSETOF] = PREC_PRIMARY,
119 [EXPR_VA_START] = PREC_PRIMARY,
120 [EXPR_VA_ARG] = PREC_PRIMARY,
121 [EXPR_VA_COPY] = PREC_PRIMARY,
122 [EXPR_STATEMENT] = PREC_PRIMARY,
123 [EXPR_LABEL_ADDRESS] = PREC_PRIMARY,
124
125 [EXPR_UNARY_NEGATE] = PREC_UNARY,
126 [EXPR_UNARY_PLUS] = PREC_UNARY,
127 [EXPR_UNARY_BITWISE_NEGATE] = PREC_UNARY,
128 [EXPR_UNARY_NOT] = PREC_UNARY,
129 [EXPR_UNARY_DEREFERENCE] = PREC_UNARY,
130 [EXPR_UNARY_TAKE_ADDRESS] = PREC_UNARY,
131 [EXPR_UNARY_POSTFIX_INCREMENT] = PREC_POSTFIX,
132 [EXPR_UNARY_POSTFIX_DECREMENT] = PREC_POSTFIX,
133 [EXPR_UNARY_PREFIX_INCREMENT] = PREC_UNARY,
134 [EXPR_UNARY_PREFIX_DECREMENT] = PREC_UNARY,
135 [EXPR_UNARY_CAST] = PREC_UNARY,
136 [EXPR_UNARY_ASSUME] = PREC_PRIMARY,
137 [EXPR_UNARY_DELETE] = PREC_UNARY,
138 [EXPR_UNARY_DELETE_ARRAY] = PREC_UNARY,
139 [EXPR_UNARY_THROW] = PREC_ASSIGNMENT,
140
141 [EXPR_BINARY_ADD] = PREC_ADDITIVE,
142 [EXPR_BINARY_SUB] = PREC_ADDITIVE,
143 [EXPR_BINARY_MUL] = PREC_MULTIPLICATIVE,
144 [EXPR_BINARY_DIV] = PREC_MULTIPLICATIVE,
145 [EXPR_BINARY_MOD] = PREC_MULTIPLICATIVE,
146 [EXPR_BINARY_EQUAL] = PREC_EQUALITY,
147 [EXPR_BINARY_NOTEQUAL] = PREC_EQUALITY,
148 [EXPR_BINARY_LESS] = PREC_RELATIONAL,
149 [EXPR_BINARY_LESSEQUAL] = PREC_RELATIONAL,
150 [EXPR_BINARY_GREATER] = PREC_RELATIONAL,
151 [EXPR_BINARY_GREATEREQUAL] = PREC_RELATIONAL,
152 [EXPR_BINARY_BITWISE_AND] = PREC_AND,
153 [EXPR_BINARY_BITWISE_OR] = PREC_OR,
154 [EXPR_BINARY_BITWISE_XOR] = PREC_XOR,
155 [EXPR_BINARY_LOGICAL_AND] = PREC_LOGICAL_AND,
156 [EXPR_BINARY_LOGICAL_OR] = PREC_LOGICAL_OR,
157 [EXPR_BINARY_SHIFTLEFT] = PREC_SHIFT,
158 [EXPR_BINARY_SHIFTRIGHT] = PREC_SHIFT,
159 [EXPR_BINARY_ASSIGN] = PREC_ASSIGNMENT,
160 [EXPR_BINARY_MUL_ASSIGN] = PREC_ASSIGNMENT,
161 [EXPR_BINARY_DIV_ASSIGN] = PREC_ASSIGNMENT,
162 [EXPR_BINARY_MOD_ASSIGN] = PREC_ASSIGNMENT,
163 [EXPR_BINARY_ADD_ASSIGN] = PREC_ASSIGNMENT,
164 [EXPR_BINARY_SUB_ASSIGN] = PREC_ASSIGNMENT,
165 [EXPR_BINARY_SHIFTLEFT_ASSIGN] = PREC_ASSIGNMENT,
166 [EXPR_BINARY_SHIFTRIGHT_ASSIGN] = PREC_ASSIGNMENT,
167 [EXPR_BINARY_BITWISE_AND_ASSIGN] = PREC_ASSIGNMENT,
168 [EXPR_BINARY_BITWISE_XOR_ASSIGN] = PREC_ASSIGNMENT,
169 [EXPR_BINARY_BITWISE_OR_ASSIGN] = PREC_ASSIGNMENT,
170 [EXPR_BINARY_COMMA] = PREC_EXPRESSION,
171
172 [EXPR_BINARY_ISGREATER] = PREC_PRIMARY,
173 [EXPR_BINARY_ISGREATEREQUAL] = PREC_PRIMARY,
174 [EXPR_BINARY_ISLESS] = PREC_PRIMARY,
175 [EXPR_BINARY_ISLESSEQUAL] = PREC_PRIMARY,
176 [EXPR_BINARY_ISLESSGREATER] = PREC_PRIMARY,
177 [EXPR_BINARY_ISUNORDERED] = PREC_PRIMARY
178 };
179 assert((size_t)kind < lengthof(prec));
180 unsigned res = prec[kind];
181
182 assert(res != PREC_BOTTOM);
183 return res;
184 }
185
186 /**
187 * Print a quoted string constant.
188 *
189 * @param string the string constant
190 * @param border the border char
191 */
print_quoted_string(const string_t * const string,char border)192 static void print_quoted_string(const string_t *const string, char border)
193 {
194 print_string(get_string_encoding_prefix(string->encoding));
195
196 print_char(border);
197 const char *end = string->begin + string->size;
198 for (const char *c = string->begin; c != end; ++c) {
199 const char tc = *c;
200 if (tc == border) {
201 print_char('\\');
202 }
203 switch (tc) {
204 case '\\': print_string("\\\\"); break;
205 case '\a': print_string("\\a"); break;
206 case '\b': print_string("\\b"); break;
207 case '\f': print_string("\\f"); break;
208 case '\n': print_string("\\n"); break;
209 case '\r': print_string("\\r"); break;
210 case '\t': print_string("\\t"); break;
211 case '\v': print_string("\\v"); break;
212 case '\?': print_string("\\?"); break;
213 case 27:
214 if (c_mode & _GNUC) {
215 print_string("\\e"); break;
216 }
217 /* FALLTHROUGH */
218 default:
219 if ((unsigned)tc < 0x80 && !isprint(tc)) {
220 print_format("\\%03o", (unsigned)tc);
221 } else {
222 print_char(tc);
223 }
224 break;
225 }
226 }
227 print_char(border);
228 }
229
print_string_literal(string_literal_expression_t const * const literal,char const delimiter)230 static void print_string_literal(string_literal_expression_t const *const literal, char const delimiter)
231 {
232 print_quoted_string(&literal->value, delimiter);
233 }
234
print_literal(const literal_expression_t * literal)235 static void print_literal(const literal_expression_t *literal)
236 {
237 switch (literal->base.kind) {
238 case EXPR_LITERAL_MS_NOOP:
239 print_string("__noop");
240 return;
241
242 case EXPR_LITERAL_BOOLEAN:
243 case EXPR_LITERAL_FLOATINGPOINT:
244 case EXPR_LITERAL_INTEGER:
245 print_string(literal->value.begin);
246 return;
247
248 default:
249 break;
250 }
251 print_string("INVALID LITERAL KIND");
252 }
253
254 /**
255 * Prints a predefined symbol.
256 */
print_funcname(const funcname_expression_t * funcname)257 static void print_funcname(const funcname_expression_t *funcname)
258 {
259 const char *s = "";
260 switch (funcname->kind) {
261 case FUNCNAME_FUNCTION: s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
262 case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
263 case FUNCNAME_FUNCSIG: s = "__FUNCSIG__"; break;
264 case FUNCNAME_FUNCDNAME: s = "__FUNCDNAME__"; break;
265 }
266 print_string(s);
267 }
268
print_compound_literal(const compound_literal_expression_t * expression)269 static void print_compound_literal(
270 const compound_literal_expression_t *expression)
271 {
272 print_char('(');
273 print_type(expression->type);
274 print_char(')');
275 print_initializer(expression->initializer);
276 }
277
print_assignment_expression(const expression_t * const expr)278 static void print_assignment_expression(const expression_t *const expr)
279 {
280 print_expression_prec(expr, PREC_ASSIGNMENT);
281 }
282
283 /**
284 * Prints a call expression.
285 *
286 * @param call the call expression
287 */
print_call_expression(const call_expression_t * call)288 static void print_call_expression(const call_expression_t *call)
289 {
290 print_expression_prec(call->function, PREC_POSTFIX);
291 print_char('(');
292 separator_t sep = { "", ", " };
293 for (call_argument_t const *arg = call->arguments; arg; arg = arg->next) {
294 print_string(sep_next(&sep));
295 print_assignment_expression(arg->expression);
296 }
297 print_char(')');
298 }
299
300 /**
301 * Prints a binary expression.
302 *
303 * @param binexpr the binary expression
304 */
print_binary_expression(const binary_expression_t * binexpr)305 static void print_binary_expression(const binary_expression_t *binexpr)
306 {
307 unsigned prec = get_expression_precedence(binexpr->base.kind);
308 int r2l = right_to_left(prec);
309
310 print_expression_prec(binexpr->left, prec + r2l);
311 char const* op;
312 switch (binexpr->base.kind) {
313 case EXPR_BINARY_COMMA: op = ", "; break;
314 case EXPR_BINARY_ASSIGN: op = " = "; break;
315 case EXPR_BINARY_ADD: op = " + "; break;
316 case EXPR_BINARY_SUB: op = " - "; break;
317 case EXPR_BINARY_MUL: op = " * "; break;
318 case EXPR_BINARY_MOD: op = " % "; break;
319 case EXPR_BINARY_DIV: op = " / "; break;
320 case EXPR_BINARY_BITWISE_OR: op = " | "; break;
321 case EXPR_BINARY_BITWISE_AND: op = " & "; break;
322 case EXPR_BINARY_BITWISE_XOR: op = " ^ "; break;
323 case EXPR_BINARY_LOGICAL_OR: op = " || "; break;
324 case EXPR_BINARY_LOGICAL_AND: op = " && "; break;
325 case EXPR_BINARY_NOTEQUAL: op = " != "; break;
326 case EXPR_BINARY_EQUAL: op = " == "; break;
327 case EXPR_BINARY_LESS: op = " < "; break;
328 case EXPR_BINARY_LESSEQUAL: op = " <= "; break;
329 case EXPR_BINARY_GREATER: op = " > "; break;
330 case EXPR_BINARY_GREATEREQUAL: op = " >= "; break;
331 case EXPR_BINARY_SHIFTLEFT: op = " << "; break;
332 case EXPR_BINARY_SHIFTRIGHT: op = " >> "; break;
333
334 case EXPR_BINARY_ADD_ASSIGN: op = " += "; break;
335 case EXPR_BINARY_SUB_ASSIGN: op = " -= "; break;
336 case EXPR_BINARY_MUL_ASSIGN: op = " *= "; break;
337 case EXPR_BINARY_MOD_ASSIGN: op = " %= "; break;
338 case EXPR_BINARY_DIV_ASSIGN: op = " /= "; break;
339 case EXPR_BINARY_BITWISE_OR_ASSIGN: op = " |= "; break;
340 case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= "; break;
341 case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= "; break;
342 case EXPR_BINARY_SHIFTLEFT_ASSIGN: op = " <<= "; break;
343 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: op = " >>= "; break;
344 default: panic("invalid binexpression found");
345 }
346 print_string(op);
347 print_expression_prec(binexpr->right, prec + 1 - r2l);
348 }
349
350 /**
351 * Prints an unary expression.
352 *
353 * @param unexpr the unary expression
354 */
print_unary_expression(const unary_expression_t * unexpr)355 static void print_unary_expression(const unary_expression_t *unexpr)
356 {
357 unsigned prec = get_expression_precedence(unexpr->base.kind);
358 switch (unexpr->base.kind) {
359 case EXPR_UNARY_NEGATE: print_char ('-' ); break;
360 case EXPR_UNARY_PLUS: print_char ('+' ); break;
361 case EXPR_UNARY_NOT: print_char ('!' ); break;
362 case EXPR_UNARY_BITWISE_NEGATE: print_char ('~' ); break;
363 case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
364 case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
365 case EXPR_UNARY_DEREFERENCE: print_char ('*' ); break;
366 case EXPR_UNARY_TAKE_ADDRESS: print_char ('&' ); break;
367 case EXPR_UNARY_DELETE: print_string("delete "); break;
368 case EXPR_UNARY_DELETE_ARRAY: print_string("delete [] "); break;
369
370 case EXPR_UNARY_POSTFIX_INCREMENT:
371 print_expression_prec(unexpr->value, prec);
372 print_string("++");
373 return;
374 case EXPR_UNARY_POSTFIX_DECREMENT:
375 print_expression_prec(unexpr->value, prec);
376 print_string("--");
377 return;
378 case EXPR_UNARY_CAST:
379 print_char('(');
380 print_type(unexpr->base.type);
381 print_char(')');
382 break;
383 case EXPR_UNARY_ASSUME:
384 print_string("__assume(");
385 print_assignment_expression(unexpr->value);
386 print_char(')');
387 return;
388
389 case EXPR_UNARY_THROW:
390 if (unexpr->value == NULL) {
391 print_string("throw");
392 return;
393 }
394 print_string("throw ");
395 break;
396
397 default:
398 panic("invalid unary expression found");
399 }
400 print_expression_prec(unexpr->value, prec);
401 }
402
403 /**
404 * Prints a reference expression.
405 *
406 * @param ref the reference expression
407 */
print_reference_expression(const reference_expression_t * ref)408 static void print_reference_expression(const reference_expression_t *ref)
409 {
410 print_string(ref->entity->base.symbol->string);
411 }
412
413 /**
414 * Prints a label address expression.
415 *
416 * @param ref the reference expression
417 */
print_label_address_expression(const label_address_expression_t * le)418 static void print_label_address_expression(const label_address_expression_t *le)
419 {
420 print_format("&&%s", le->label->base.symbol->string);
421 }
422
423 /**
424 * Prints an array expression.
425 *
426 * @param expression the array expression
427 */
print_array_expression(const array_access_expression_t * expression)428 static void print_array_expression(const array_access_expression_t *expression)
429 {
430 if (!expression->flipped) {
431 print_expression_prec(expression->array_ref, PREC_POSTFIX);
432 print_char('[');
433 print_expression(expression->index);
434 print_char(']');
435 } else {
436 print_expression_prec(expression->index, PREC_POSTFIX);
437 print_char('[');
438 print_expression(expression->array_ref);
439 print_char(']');
440 }
441 }
442
443 /**
444 * Prints a typeproperty expression (sizeof or __alignof__).
445 *
446 * @param expression the type property expression
447 */
print_typeprop_expression(const typeprop_expression_t * expression)448 static void print_typeprop_expression(const typeprop_expression_t *expression)
449 {
450 switch (expression->base.kind) {
451 case EXPR_SIZEOF: print_string("sizeof"); break;
452 case EXPR_ALIGNOF: print_string(c_mode & _C11 ? "_Alignof" : "__alignof__"); break;
453 default: panic("invalid typeprop kind");
454 }
455 if (expression->tp_expression != NULL) {
456 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
457 print_expression_prec(expression->tp_expression, PREC_TOP);
458 } else {
459 print_char('(');
460 print_type(expression->type);
461 print_char(')');
462 }
463 }
464
465 /**
466 * Prints a builtin constant expression.
467 *
468 * @param expression the builtin constant expression
469 */
print_builtin_constant(const builtin_constant_expression_t * expression)470 static void print_builtin_constant(const builtin_constant_expression_t *expression)
471 {
472 print_string("__builtin_constant_p(");
473 print_assignment_expression(expression->value);
474 print_char(')');
475 }
476
477 /**
478 * Prints a builtin types compatible expression.
479 *
480 * @param expression the builtin types compatible expression
481 */
print_builtin_types_compatible(const builtin_types_compatible_expression_t * expression)482 static void print_builtin_types_compatible(
483 const builtin_types_compatible_expression_t *expression)
484 {
485 print_string("__builtin_types_compatible_p(");
486 print_type(expression->left);
487 print_string(", ");
488 print_type(expression->right);
489 print_char(')');
490 }
491
492 /**
493 * Prints a conditional expression.
494 *
495 * @param expression the conditional expression
496 */
print_conditional(const conditional_expression_t * expression)497 static void print_conditional(const conditional_expression_t *expression)
498 {
499 print_expression_prec(expression->condition, PREC_LOGICAL_OR);
500 if (expression->true_expression != NULL) {
501 print_string(" ? ");
502 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
503 print_string(" : ");
504 } else {
505 print_string(" ?: ");
506 }
507 precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
508 print_expression_prec(expression->false_expression, prec);
509 }
510
511 /**
512 * Prints a va_start expression.
513 *
514 * @param expression the va_start expression
515 */
print_va_start(const va_start_expression_t * const expression)516 static void print_va_start(const va_start_expression_t *const expression)
517 {
518 print_string("__builtin_va_start(");
519 print_assignment_expression(expression->ap);
520 print_string(", ");
521 print_assignment_expression(expression->parameter);
522 print_char(')');
523 }
524
525 /**
526 * Prints a va_arg expression.
527 *
528 * @param expression the va_arg expression
529 */
print_va_arg(const va_arg_expression_t * expression)530 static void print_va_arg(const va_arg_expression_t *expression)
531 {
532 print_string("__builtin_va_arg(");
533 print_assignment_expression(expression->ap);
534 print_string(", ");
535 print_type(expression->base.type);
536 print_char(')');
537 }
538
539 /**
540 * Prints a va_copy expression.
541 *
542 * @param expression the va_copy expression
543 */
print_va_copy(const va_copy_expression_t * expression)544 static void print_va_copy(const va_copy_expression_t *expression)
545 {
546 print_string("__builtin_va_copy(");
547 print_assignment_expression(expression->dst);
548 print_string(", ");
549 print_assignment_expression(expression->src);
550 print_char(')');
551 }
552
553 /**
554 * Prints a select expression (. or ->).
555 *
556 * @param expression the select expression
557 */
print_select(const select_expression_t * expression)558 static void print_select(const select_expression_t *expression)
559 {
560 print_expression_prec(expression->compound, PREC_POSTFIX);
561 /* do not print anything for anonymous struct/union selects
562 * FIXME: if the anonymous select was a '->' this will print '.'
563 */
564 if (expression->compound_entry->base.symbol == NULL)
565 return;
566
567 if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
568 print_string("->");
569 } else {
570 print_char('.');
571 }
572 print_string(expression->compound_entry->base.symbol->string);
573 }
574
575 /**
576 * Prints a type classify expression.
577 *
578 * @param expr the type classify expression
579 */
print_classify_type_expression(const classify_type_expression_t * const expr)580 static void print_classify_type_expression(
581 const classify_type_expression_t *const expr)
582 {
583 print_string("__builtin_classify_type(");
584 print_assignment_expression(expr->type_expression);
585 print_char(')');
586 }
587
588 /**
589 * Prints a designator.
590 *
591 * @param designator the designator
592 */
print_designator(const designator_t * designator)593 static void print_designator(const designator_t *designator)
594 {
595 for ( ; designator != NULL; designator = designator->next) {
596 if (designator->symbol == NULL) {
597 print_char('[');
598 print_expression(designator->array_index);
599 print_char(']');
600 } else {
601 print_char('.');
602 print_string(designator->symbol->string);
603 }
604 }
605 }
606
607 /**
608 * Prints an offsetof expression.
609 *
610 * @param expression the offset expression
611 */
print_offsetof_expression(const offsetof_expression_t * expression)612 static void print_offsetof_expression(const offsetof_expression_t *expression)
613 {
614 print_string("__builtin_offsetof(");
615 print_type(expression->type);
616 print_char(',');
617 print_designator(expression->designator);
618 print_char(')');
619 }
620
621 /**
622 * Prints a statement expression.
623 *
624 * @param expression the statement expression
625 */
print_statement_expression(const statement_expression_t * expression)626 static void print_statement_expression(const statement_expression_t *expression)
627 {
628 print_char('(');
629 print_statement(expression->statement);
630 print_char(')');
631 }
632
needs_parentheses(expression_t const * const expr,unsigned const top_prec)633 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
634 {
635 if (expr->base.parenthesized)
636 return true;
637
638 if (top_prec > get_expression_precedence(expr->base.kind))
639 return true;
640
641 if (print_parenthesis && top_prec != PREC_BOTTOM) {
642 switch (expr->kind) {
643 case EXPR_ENUM_CONSTANT:
644 case EXPR_FUNCNAME:
645 case EXPR_LITERAL_CASES:
646 case EXPR_LITERAL_CHARACTER:
647 case EXPR_REFERENCE:
648 case EXPR_STRING_LITERAL:
649 /* Do not print () around subexpressions consisting of a single token. */
650 return false;
651
652 default:
653 return true;
654 }
655 }
656
657 return false;
658 }
659
660 /**
661 * Prints an expression with parenthesis if needed.
662 *
663 * @param expression the expression to print
664 * @param top_prec the precedence of the user of this expression.
665 */
print_expression_prec(expression_t const * expr,unsigned const top_prec)666 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
667 {
668 if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
669 expr = expr->unary.value;
670 }
671
672 bool const parenthesized = needs_parentheses(expr, top_prec);
673
674 if (parenthesized)
675 print_char('(');
676 switch (expr->kind) {
677 case EXPR_ALIGNOF:
678 case EXPR_SIZEOF: print_typeprop_expression( &expr->typeprop); break;
679 case EXPR_ARRAY_ACCESS: print_array_expression( &expr->array_access); break;
680 case EXPR_BINARY_CASES: print_binary_expression( &expr->binary); break;
681 case EXPR_BUILTIN_CONSTANT_P: print_builtin_constant( &expr->builtin_constant); break;
682 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
683 case EXPR_CALL: print_call_expression( &expr->call); break;
684 case EXPR_CLASSIFY_TYPE: print_classify_type_expression(&expr->classify_type); break;
685 case EXPR_COMPOUND_LITERAL: print_compound_literal( &expr->compound_literal); break;
686 case EXPR_CONDITIONAL: print_conditional( &expr->conditional); break;
687 case EXPR_ERROR: print_string("$error$"); break;
688 case EXPR_FUNCNAME: print_funcname( &expr->funcname); break;
689 case EXPR_LABEL_ADDRESS: print_label_address_expression(&expr->label_address); break;
690 case EXPR_LITERAL_CASES: print_literal( &expr->literal); break;
691 case EXPR_LITERAL_CHARACTER: print_string_literal( &expr->string_literal, '\''); break;
692 case EXPR_OFFSETOF: print_offsetof_expression( &expr->offsetofe); break;
693 case EXPR_REFERENCE:
694 case EXPR_ENUM_CONSTANT: print_reference_expression( &expr->reference); break;
695 case EXPR_SELECT: print_select( &expr->select); break;
696 case EXPR_STATEMENT: print_statement_expression( &expr->statement); break;
697 case EXPR_STRING_LITERAL: print_string_literal( &expr->string_literal, '"'); break;
698 case EXPR_UNARY_CASES: print_unary_expression( &expr->unary); break;
699 case EXPR_VA_ARG: print_va_arg( &expr->va_arge); break;
700 case EXPR_VA_COPY: print_va_copy( &expr->va_copye); break;
701 case EXPR_VA_START: print_va_start( &expr->va_starte); break;
702 }
703 if (parenthesized)
704 print_char(')');
705 }
706
print_indented_statement(statement_t const * const stmt)707 static void print_indented_statement(statement_t const *const stmt)
708 {
709 switch (stmt->kind) {
710 case STATEMENT_LABEL:
711 break;
712
713 case STATEMENT_CASE_LABEL:
714 for (int i = 0; i != case_indent; ++i)
715 print_char('\t');
716 break;
717
718 default:
719 print_indent();
720 break;
721 }
722 print_statement(stmt);
723 }
724
725 /**
726 * Print an compound statement.
727 *
728 * @param block the compound statement
729 */
print_compound_statement(const compound_statement_t * block)730 static void print_compound_statement(const compound_statement_t *block)
731 {
732 print_string("{\n");
733 ++indent;
734
735 for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
736 print_indented_statement(stmt);
737 print_char('\n');
738 }
739
740 --indent;
741 print_indent();
742 print_char('}');
743 }
744
745 /**
746 * Print a return statement.
747 *
748 * @param statement the return statement
749 */
print_return_statement(const return_statement_t * statement)750 static void print_return_statement(const return_statement_t *statement)
751 {
752 expression_t const *const val = statement->value;
753 if (val != NULL) {
754 print_string("return ");
755 print_expression(val);
756 print_char(';');
757 } else {
758 print_string("return;");
759 }
760 }
761
762 /**
763 * Print an expression statement.
764 *
765 * @param statement the expression statement
766 */
print_expression_statement(const expression_statement_t * statement)767 static void print_expression_statement(const expression_statement_t *statement)
768 {
769 print_expression(statement->expression);
770 print_char(';');
771 }
772
773 /**
774 * Print a computed goto statement.
775 *
776 * @param statement the computed goto statement
777 */
print_computed_goto_statement(computed_goto_statement_t const * const stmt)778 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
779 {
780 print_string("goto *");
781 print_expression(stmt->expression);
782 print_char(';');
783 }
784
785 /**
786 * Print a goto statement.
787 *
788 * @param statement the goto statement
789 */
print_goto_statement(const goto_statement_t * statement)790 static void print_goto_statement(const goto_statement_t *statement)
791 {
792 print_string("goto ");
793 print_string(statement->label->base.symbol->string);
794 print_char(';');
795 }
796
797 /**
798 * Print a label statement.
799 *
800 * @param statement the label statement
801 */
print_label_statement(const label_statement_t * statement)802 static void print_label_statement(const label_statement_t *statement)
803 {
804 print_format("%s:\n", statement->label->base.symbol->string);
805 print_indented_statement(statement->statement);
806 }
807
print_inner_statement(statement_t const * const stmt)808 static void print_inner_statement(statement_t const *const stmt)
809 {
810 if (stmt->kind == STATEMENT_COMPOUND) {
811 print_char(' ');
812 print_compound_statement(&stmt->compound);
813 } else {
814 print_char('\n');
815 ++indent;
816 print_indented_statement(stmt);
817 --indent;
818 }
819 }
820
print_after_inner_statement(statement_t const * const stmt)821 static void print_after_inner_statement(statement_t const *const stmt)
822 {
823 if (stmt->kind == STATEMENT_COMPOUND) {
824 print_char(' ');
825 } else {
826 print_char('\n');
827 print_indent();
828 }
829 }
830
831 /**
832 * Print an if statement.
833 *
834 * @param statement the if statement
835 */
print_if_statement(const if_statement_t * statement)836 static void print_if_statement(const if_statement_t *statement)
837 {
838 print_string("if (");
839 print_expression(statement->condition);
840 print_char(')');
841 print_inner_statement(statement->true_statement);
842
843 statement_t const *const f = statement->false_statement;
844 if (f) {
845 print_after_inner_statement(statement->true_statement);
846 print_string("else");
847 if (f->kind == STATEMENT_IF) {
848 print_char(' ');
849 print_if_statement(&f->ifs);
850 } else {
851 print_inner_statement(f);
852 }
853 }
854 }
855
856 /**
857 * Print a switch statement.
858 *
859 * @param statement the switch statement
860 */
print_switch_statement(const switch_statement_t * statement)861 static void print_switch_statement(const switch_statement_t *statement)
862 {
863 int const old_case_indent = case_indent;
864 case_indent = indent;
865
866 print_string("switch (");
867 print_expression(statement->expression);
868 print_char(')');
869 print_inner_statement(statement->body);
870
871 case_indent = old_case_indent;
872 }
873
874 /**
875 * Print a case label (including the default label).
876 *
877 * @param statement the case label statement
878 */
print_case_label(const case_label_statement_t * statement)879 static void print_case_label(const case_label_statement_t *statement)
880 {
881 if (statement->expression == NULL) {
882 print_string("default:\n");
883 } else {
884 print_string("case ");
885 print_expression(statement->expression);
886 if (statement->end_range != NULL) {
887 print_string(" ... ");
888 print_expression(statement->end_range);
889 }
890 print_string(":\n");
891 }
892 print_indented_statement(statement->statement);
893 }
894
print_typedef(const entity_t * entity)895 static void print_typedef(const entity_t *entity)
896 {
897 print_string("typedef ");
898 print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
899 print_char(';');
900 }
901
902 /**
903 * returns true if the entity is a compiler generated one and has no real
904 * correspondenc in the source file
905 */
is_generated_entity(const entity_t * entity)906 static bool is_generated_entity(const entity_t *entity)
907 {
908 if (entity->kind == ENTITY_TYPEDEF)
909 return entity->typedefe.builtin;
910
911 if (is_declaration(entity))
912 return entity->declaration.implicit;
913
914 return false;
915 }
916
917 /**
918 * Print a declaration statement.
919 *
920 * @param statement the statement
921 */
print_declaration_statement(const declaration_statement_t * statement)922 static void print_declaration_statement(
923 const declaration_statement_t *statement)
924 {
925 bool first = true;
926 entity_t *entity = statement->declarations_begin;
927 if (entity == NULL) {
928 print_string("/* empty declaration statement */");
929 return;
930 }
931
932 entity_t *const end = statement->declarations_end->base.next;
933 for (; entity != end; entity = entity->base.next) {
934 if (entity->kind == ENTITY_ENUM_VALUE)
935 continue;
936 if (is_generated_entity(entity))
937 continue;
938
939 if (!first) {
940 print_char('\n');
941 print_indent();
942 } else {
943 first = false;
944 }
945
946 print_entity(entity);
947 }
948 }
949
950 /**
951 * Print a do-while statement.
952 *
953 * @param statement the statement
954 */
print_do_while_statement(const do_while_statement_t * statement)955 static void print_do_while_statement(const do_while_statement_t *statement)
956 {
957 print_string("do");
958 print_inner_statement(statement->body);
959 print_after_inner_statement(statement->body);
960 print_string("while (");
961 print_expression(statement->condition);
962 print_string(");");
963 }
964
965 /**
966 * Print a for statement.
967 *
968 * @param statement the statement
969 */
print_for_statement(const for_statement_t * statement)970 static void print_for_statement(const for_statement_t *statement)
971 {
972 if (statement->initialisation || statement->scope.entities || !statement->condition || statement->step) {
973 print_string("for (");
974 if (statement->initialisation != NULL) {
975 print_expression(statement->initialisation);
976 print_char(';');
977 } else {
978 entity_t const *entity = statement->scope.entities;
979 for (; entity != NULL; entity = entity->base.next) {
980 if (is_generated_entity(entity))
981 continue;
982 /* FIXME display of multiple declarations is wrong */
983 print_declaration(entity);
984 }
985 }
986 if (statement->condition != NULL) {
987 print_char(' ');
988 print_expression(statement->condition);
989 }
990 print_char(';');
991 if (statement->step != NULL) {
992 print_char(' ');
993 print_expression(statement->step);
994 }
995 } else {
996 print_string("while (");
997 print_expression(statement->condition);
998 }
999 print_char(')');
1000 print_inner_statement(statement->body);
1001 }
1002
1003 /**
1004 * Print assembler arguments.
1005 *
1006 * @param arguments the arguments
1007 */
print_asm_arguments(asm_argument_t const * const arguments)1008 static void print_asm_arguments(asm_argument_t const *const arguments)
1009 {
1010 print_string(" :");
1011 separator_t sep = { " ", ", " };
1012 for (asm_argument_t const *i = arguments; i; i = i->next) {
1013 print_string(sep_next(&sep));
1014 if (i->symbol)
1015 print_format("[%s] ", i->symbol->string);
1016 print_quoted_string(&i->constraints, '"');
1017 print_string(" (");
1018 print_expression(i->expression);
1019 print_char(')');
1020 }
1021 }
1022
1023 /**
1024 * Print assembler clobbers.
1025 *
1026 * @param clobbers the clobbers
1027 */
print_asm_clobbers(asm_clobber_t const * const clobbers)1028 static void print_asm_clobbers(asm_clobber_t const *const clobbers)
1029 {
1030 print_string(" :");
1031 separator_t sep = { " ", ", " };
1032 for (asm_clobber_t const *i = clobbers; i; i = i->next) {
1033 print_string(sep_next(&sep));
1034 print_quoted_string(&i->clobber, '"');
1035 }
1036 }
1037
print_asm_labels(asm_label_t const * const labels)1038 static void print_asm_labels(asm_label_t const *const labels)
1039 {
1040 print_string(" :");
1041 separator_t sep = { " ", ", " };
1042 for (asm_label_t const *i = labels; i; i = i->next) {
1043 print_string(sep_next(&sep));
1044 print_string(i->label->base.symbol->string);
1045 }
1046 }
1047
1048 /**
1049 * Print an assembler statement.
1050 *
1051 * @param stmt the statement
1052 */
print_asm_statement(asm_statement_t const * const stmt)1053 static void print_asm_statement(asm_statement_t const *const stmt)
1054 {
1055 print_string("asm");
1056 if (stmt->is_volatile) print_string(" volatile");
1057 if (stmt->labels) print_string(" goto");
1058 print_char('(');
1059 print_quoted_string(&stmt->asm_text, '"');
1060
1061 unsigned const n =
1062 stmt->labels ? 4 :
1063 stmt->clobbers ? 3 :
1064 stmt->inputs ? 2 :
1065 stmt->outputs ? 1 :
1066 0;
1067 if (n >= 1) print_asm_arguments(stmt->outputs);
1068 if (n >= 2) print_asm_arguments(stmt->inputs);
1069 if (n >= 3) print_asm_clobbers( stmt->clobbers);
1070 if (n >= 4) print_asm_labels( stmt->labels);
1071
1072 print_string(");");
1073 }
1074
1075 /**
1076 * Print a microsoft __try statement.
1077 *
1078 * @param statement the statement
1079 */
print_ms_try_statement(const ms_try_statement_t * statement)1080 static void print_ms_try_statement(const ms_try_statement_t *statement)
1081 {
1082 print_string("__try");
1083 print_inner_statement(statement->try_statement);
1084 print_after_inner_statement(statement->try_statement);
1085 if (statement->except_expression != NULL) {
1086 print_string("__except(");
1087 print_expression(statement->except_expression);
1088 print_char(')');
1089 } else {
1090 print_string("__finally");
1091 }
1092 print_inner_statement(statement->final_statement);
1093 }
1094
1095 /**
1096 * Print a microsoft __leave statement.
1097 *
1098 * @param statement the statement
1099 */
print_leave_statement(const leave_statement_t * statement)1100 static void print_leave_statement(const leave_statement_t *statement)
1101 {
1102 (void)statement;
1103 print_string("__leave;");
1104 }
1105
1106 /**
1107 * Print a statement.
1108 *
1109 * @param statement the statement
1110 */
print_statement(statement_t const * const stmt)1111 void print_statement(statement_t const *const stmt)
1112 {
1113 switch (stmt->kind) {
1114 case STATEMENT_ASM: print_asm_statement( &stmt->asms); break;
1115 case STATEMENT_BREAK: print_string("break;"); break;
1116 case STATEMENT_CASE_LABEL: print_case_label( &stmt->case_label); break;
1117 case STATEMENT_COMPOUND: print_compound_statement( &stmt->compound); break;
1118 case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1119 case STATEMENT_CONTINUE: print_string("continue;"); break;
1120 case STATEMENT_DECLARATION: print_declaration_statement( &stmt->declaration); break;
1121 case STATEMENT_DO_WHILE: print_do_while_statement( &stmt->do_while); break;
1122 case STATEMENT_EMPTY: print_char(';'); break;
1123 case STATEMENT_ERROR: print_string("$error statement$"); break;
1124 case STATEMENT_EXPRESSION: print_expression_statement( &stmt->expression); break;
1125 case STATEMENT_FOR: print_for_statement( &stmt->fors); break;
1126 case STATEMENT_GOTO: print_goto_statement( &stmt->gotos); break;
1127 case STATEMENT_IF: print_if_statement( &stmt->ifs); break;
1128 case STATEMENT_LABEL: print_label_statement( &stmt->label); break;
1129 case STATEMENT_LEAVE: print_leave_statement( &stmt->leave); break;
1130 case STATEMENT_MS_TRY: print_ms_try_statement( &stmt->ms_try); break;
1131 case STATEMENT_RETURN: print_return_statement( &stmt->returns); break;
1132 case STATEMENT_SWITCH: print_switch_statement( &stmt->switchs); break;
1133 }
1134 }
1135
1136 /**
1137 * Print a storage class.
1138 *
1139 * @param storage_class the storage class
1140 */
print_storage_class(storage_class_tag_t storage_class)1141 static void print_storage_class(storage_class_tag_t storage_class)
1142 {
1143 switch (storage_class) {
1144 case STORAGE_CLASS_NONE: return;
1145 case STORAGE_CLASS_TYPEDEF: print_string("typedef "); return;
1146 case STORAGE_CLASS_EXTERN: print_string("extern "); return;
1147 case STORAGE_CLASS_STATIC: print_string("static "); return;
1148 case STORAGE_CLASS_AUTO: print_string("auto "); return;
1149 case STORAGE_CLASS_REGISTER: print_string("register "); return;
1150 }
1151 panic("invalid storage class");
1152 }
1153
1154 /**
1155 * Print an initializer.
1156 *
1157 * @param initializer the initializer
1158 */
print_initializer(const initializer_t * initializer)1159 void print_initializer(const initializer_t *initializer)
1160 {
1161 if (initializer == NULL) {
1162 print_string("{}");
1163 return;
1164 }
1165
1166 switch (initializer->kind) {
1167 case INITIALIZER_STRING:
1168 case INITIALIZER_VALUE:
1169 print_assignment_expression(initializer->value.value);
1170 return;
1171
1172 case INITIALIZER_LIST: {
1173 print_string("{ ");
1174 const initializer_list_t *list = &initializer->list;
1175
1176 for (size_t i = 0 ; i < list->len; ++i) {
1177 const initializer_t *sub_init = list->initializers[i];
1178 print_initializer(list->initializers[i]);
1179 if (i < list->len-1) {
1180 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1181 print_string(", ");
1182 }
1183 }
1184 print_string(" }");
1185 return;
1186 }
1187
1188 case INITIALIZER_DESIGNATOR:
1189 print_designator(initializer->designator.designator);
1190 print_string(" = ");
1191 return;
1192 }
1193
1194 panic("invalid initializer kind found");
1195 }
1196
1197 #if 0
1198 /**
1199 * Print microsoft extended declaration modifiers.
1200 */
1201 static void print_ms_modifiers(const declaration_t *declaration)
1202 {
1203 if ((c_mode & _MS) == 0)
1204 return;
1205
1206 decl_modifiers_t modifiers = declaration->modifiers;
1207
1208 separator_t sep = { "__declspec(", ", " };
1209
1210 if (declaration->base.kind == ENTITY_VARIABLE) {
1211 variable_t *variable = (variable_t*)declaration;
1212 if (variable->alignment != 0
1213 || variable->get_property_sym != NULL
1214 || variable->put_property_sym != NULL) {
1215 if (variable->alignment != 0) {
1216 print_format("%salign(%u)", sep_next(&sep), variable->alignment);
1217 }
1218 if (variable->get_property_sym != NULL
1219 || variable->put_property_sym != NULL) {
1220 char *comma = "";
1221 print_format("%sproperty(", sep_next(&sep));
1222 if (variable->get_property_sym != NULL) {
1223 print_format("get=%s", variable->get_property_sym->string);
1224 comma = ", ";
1225 }
1226 if (variable->put_property_sym != NULL)
1227 print_format("%sput=%s", comma, variable->put_property_sym->string);
1228 print_char(')');
1229 }
1230 }
1231 }
1232
1233 /* DM_FORCEINLINE handled outside. */
1234 if ((modifiers & ~DM_FORCEINLINE) != 0) {
1235 if (modifiers & DM_DLLIMPORT) {
1236 print_format("%sdllimport", sep_next(&sep));
1237 }
1238 if (modifiers & DM_DLLEXPORT) {
1239 print_format("%sdllexport", sep_next(&sep));
1240 }
1241 if (modifiers & DM_THREAD) {
1242 print_format("%sthread", sep_next(&sep));
1243 }
1244 if (modifiers & DM_NAKED) {
1245 print_format("%snaked", sep_next(&sep));
1246 }
1247 if (modifiers & DM_THREAD) {
1248 print_format("%sthread", sep_next(&sep));
1249 }
1250 if (modifiers & DM_SELECTANY) {
1251 print_format("%sselectany", sep_next(&sep));
1252 }
1253 if (modifiers & DM_NOTHROW) {
1254 print_format("%snothrow", sep_next(&sep));
1255 }
1256 if (modifiers & DM_NORETURN) {
1257 print_format("%snoreturn", sep_next(&sep));
1258 }
1259 if (modifiers & DM_NOINLINE) {
1260 print_format("%snoinline", sep_next(&sep));
1261 }
1262 if (modifiers & DM_DEPRECATED) {
1263 print_format("%sdeprecated", sep_next(&sep));
1264 if (declaration->deprecated_string != NULL)
1265 print_format("(\"%s\")",
1266 declaration->deprecated_string);
1267 }
1268 if (modifiers & DM_RESTRICT) {
1269 print_format("%srestrict", sep_next(&sep));
1270 }
1271 if (modifiers & DM_NOALIAS) {
1272 print_format("%snoalias", sep_next(&sep));
1273 }
1274 }
1275
1276 if (!sep_at_first(&sep))
1277 print_string(") ");
1278 }
1279 #endif
1280
print_scope(const scope_t * scope)1281 static void print_scope(const scope_t *scope)
1282 {
1283 const entity_t *entity = scope->entities;
1284 for ( ; entity != NULL; entity = entity->base.next) {
1285 print_indent();
1286 print_entity(entity);
1287 print_char('\n');
1288 }
1289 }
1290
print_namespace(const namespace_t * namespace)1291 static void print_namespace(const namespace_t *namespace)
1292 {
1293 print_string("namespace ");
1294 if (namespace->base.symbol != NULL) {
1295 print_string(namespace->base.symbol->string);
1296 print_char(' ');
1297 }
1298
1299 print_string("{\n");
1300 ++indent;
1301
1302 print_scope(&namespace->members);
1303
1304 --indent;
1305 print_indent();
1306 print_string("}\n");
1307 }
1308
1309 /**
1310 * Print a variable or function declaration
1311 */
print_declaration(const entity_t * entity)1312 void print_declaration(const entity_t *entity)
1313 {
1314 assert(is_declaration(entity));
1315 const declaration_t *declaration = &entity->declaration;
1316
1317 print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1318 if (entity->kind == ENTITY_FUNCTION) {
1319 function_t *function = (function_t*)declaration;
1320 if (function->is_inline) {
1321 if (declaration->modifiers & DM_FORCEINLINE) {
1322 print_string("__forceinline ");
1323 } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1324 print_string("__inline ");
1325 } else {
1326 print_string("inline ");
1327 }
1328 }
1329 }
1330 //print_ms_modifiers(declaration);
1331 switch (entity->kind) {
1332 case ENTITY_FUNCTION:
1333 print_type_ext(entity->declaration.type, entity->base.symbol,
1334 &entity->function.parameters);
1335
1336 if (entity->function.body != NULL) {
1337 print_char('\n');
1338 print_indented_statement(entity->function.body);
1339 print_char('\n');
1340 return;
1341 }
1342 break;
1343
1344 case ENTITY_VARIABLE:
1345 if (entity->variable.thread_local)
1346 print_string(c_mode & _C11 ? "_Thread_local " : "__thread ");
1347 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1348 if (entity->variable.initializer != NULL) {
1349 print_string(" = ");
1350 print_initializer(entity->variable.initializer);
1351 }
1352 break;
1353
1354 case ENTITY_COMPOUND_MEMBER:
1355 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1356 if (entity->compound_member.bitfield) {
1357 print_format(" : %u", entity->compound_member.bit_size);
1358 }
1359 break;
1360
1361 default:
1362 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1363 break;
1364 }
1365 print_char(';');
1366 }
1367
1368 /**
1369 * Prints an expression.
1370 *
1371 * @param expression the expression
1372 */
print_expression(const expression_t * expression)1373 void print_expression(const expression_t *expression)
1374 {
1375 print_expression_prec(expression, PREC_BOTTOM);
1376 }
1377
1378 /**
1379 * Print a declaration.
1380 *
1381 * @param declaration the declaration
1382 */
print_entity(const entity_t * entity)1383 void print_entity(const entity_t *entity)
1384 {
1385 if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1386 return;
1387
1388 switch ((entity_kind_tag_t)entity->kind) {
1389 case ENTITY_VARIABLE:
1390 case ENTITY_PARAMETER:
1391 case ENTITY_COMPOUND_MEMBER:
1392 case ENTITY_FUNCTION:
1393 print_declaration(entity);
1394 return;
1395 case ENTITY_TYPEDEF:
1396 print_typedef(entity);
1397 return;
1398 case ENTITY_CLASS:
1399 /* TODO */
1400 print_string("class ");
1401 print_string(entity->base.symbol->string);
1402 print_string("; /* TODO */\n");
1403 return;
1404 case ENTITY_STRUCT:
1405 print_string("struct ");
1406 goto print_compound;
1407 case ENTITY_UNION:
1408 print_string("union ");
1409 print_compound:
1410 print_string(entity->base.symbol->string);
1411 if (entity->compound.complete) {
1412 print_char(' ');
1413 print_compound_definition(&entity->compound);
1414 }
1415 print_char(';');
1416 return;
1417 case ENTITY_ENUM:
1418 print_string("enum ");
1419 print_string(entity->base.symbol->string);
1420 print_char(' ');
1421 print_enum_definition(&entity->enume);
1422 print_char(';');
1423 return;
1424 case ENTITY_NAMESPACE:
1425 print_namespace(&entity->namespacee);
1426 return;
1427 case ENTITY_LOCAL_LABEL:
1428 print_string("__label__ ");
1429 print_string(entity->base.symbol->string);
1430 print_char(';');
1431 return;
1432 case ENTITY_LABEL:
1433 case ENTITY_ENUM_VALUE:
1434 panic("print_entity used on unexpected entity type");
1435 }
1436 panic("Invalid entity type encountered");
1437 }
1438
1439 /**
1440 * Print the AST of a translation unit.
1441 *
1442 * @param unit the translation unit
1443 */
print_ast(const translation_unit_t * unit)1444 void print_ast(const translation_unit_t *unit)
1445 {
1446 entity_t *entity = unit->scope.entities;
1447 for ( ; entity != NULL; entity = entity->base.next) {
1448 if (entity->kind == ENTITY_ENUM_VALUE)
1449 continue;
1450 if (entity->base.namespc != NAMESPACE_NORMAL
1451 && entity->base.symbol == NULL)
1452 continue;
1453 if (is_generated_entity(entity))
1454 continue;
1455
1456 print_indent();
1457 print_entity(entity);
1458 print_char('\n');
1459 }
1460 }
1461
is_constant_initializer(const initializer_t * initializer)1462 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1463 {
1464 switch (initializer->kind) {
1465 case INITIALIZER_STRING:
1466 case INITIALIZER_DESIGNATOR:
1467 return EXPR_CLASS_CONSTANT;
1468
1469 case INITIALIZER_VALUE:
1470 return is_linker_constant(initializer->value.value);
1471
1472 case INITIALIZER_LIST: {
1473 expression_classification_t all = EXPR_CLASS_CONSTANT;
1474 for (size_t i = 0; i < initializer->list.len; ++i) {
1475 initializer_t *sub_initializer = initializer->list.initializers[i];
1476 expression_classification_t const cur = is_constant_initializer(sub_initializer);
1477 if (all > cur) {
1478 all = cur;
1479 }
1480 }
1481 return all;
1482 }
1483 }
1484 panic("invalid initializer kind found");
1485 }
1486
1487 /**
1488 * Checks if an expression references an object with a constant/known location
1489 * to the linker. Example:
1490 * - "x", "*&x" with x being a global variable. The value of x need not be
1491 * constant but the address of x is.
1492 * - "a.b.c" when a has a constant/known location to the linker
1493 */
is_object_with_linker_constant_address(const expression_t * expression)1494 static expression_classification_t is_object_with_linker_constant_address(
1495 const expression_t *expression)
1496 {
1497 switch (expression->kind) {
1498 case EXPR_UNARY_DEREFERENCE:
1499 return is_linker_constant(expression->unary.value);
1500
1501 case EXPR_SELECT: {
1502 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1503 if (is_type_pointer(base_type)) {
1504 /* it's a -> */
1505 return is_linker_constant(expression->select.compound);
1506 } else {
1507 return is_object_with_linker_constant_address(expression->select.compound);
1508 }
1509 }
1510
1511 case EXPR_ARRAY_ACCESS: {
1512 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1513 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1514 return ref < idx ? ref : idx;
1515 }
1516
1517 case EXPR_REFERENCE: {
1518 entity_t *entity = expression->reference.entity;
1519 if (!is_declaration(entity))
1520 return EXPR_CLASS_VARIABLE;
1521
1522 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1523 case STORAGE_CLASS_NONE:
1524 case STORAGE_CLASS_EXTERN:
1525 case STORAGE_CLASS_STATIC:
1526 return
1527 entity->kind != ENTITY_VARIABLE ||
1528 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1529 EXPR_CLASS_VARIABLE;
1530
1531 case STORAGE_CLASS_REGISTER:
1532 case STORAGE_CLASS_TYPEDEF:
1533 case STORAGE_CLASS_AUTO:
1534 break;
1535 }
1536 return EXPR_CLASS_VARIABLE;
1537 }
1538
1539 case EXPR_ERROR:
1540 return EXPR_CLASS_ERROR;
1541
1542 default:
1543 return EXPR_CLASS_VARIABLE;
1544 }
1545 }
1546
is_linker_constant(const expression_t * expression)1547 expression_classification_t is_linker_constant(const expression_t *expression)
1548 {
1549 switch (expression->kind) {
1550 case EXPR_STRING_LITERAL:
1551 case EXPR_FUNCNAME:
1552 case EXPR_LABEL_ADDRESS:
1553 return EXPR_CLASS_CONSTANT;
1554
1555 case EXPR_COMPOUND_LITERAL:
1556 return is_constant_initializer(expression->compound_literal.initializer);
1557
1558 case EXPR_UNARY_TAKE_ADDRESS:
1559 return is_object_with_linker_constant_address(expression->unary.value);
1560
1561 case EXPR_UNARY_DEREFERENCE: {
1562 type_t *real_type
1563 = revert_automatic_type_conversion(expression->unary.value);
1564 /* dereferencing a function is a NOP */
1565 if (is_type_function(real_type)) {
1566 return is_linker_constant(expression->unary.value);
1567 }
1568 /* FALLTHROUGH */
1569 }
1570
1571 case EXPR_UNARY_CAST: {
1572 type_t *dest = skip_typeref(expression->base.type);
1573 if (!is_type_pointer(dest) && (
1574 dest->kind != TYPE_ATOMIC ||
1575 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1576 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1577 ))
1578 return is_constant_expression(expression);
1579
1580 return is_linker_constant(expression->unary.value);
1581 }
1582
1583 case EXPR_BINARY_ADD:
1584 case EXPR_BINARY_SUB: {
1585 expression_t *const left = expression->binary.left;
1586 expression_t *const right = expression->binary.right;
1587 type_t *const ltype = skip_typeref(left->base.type);
1588 type_t *const rtype = skip_typeref(right->base.type);
1589
1590 if (is_type_pointer(ltype)) {
1591 expression_classification_t const l = is_linker_constant(left);
1592 expression_classification_t const r = is_constant_expression(right);
1593 return l < r ? l : r;
1594 } else if (is_type_pointer(rtype)) {
1595 expression_classification_t const l = is_constant_expression(left);
1596 expression_classification_t const r = is_linker_constant(right);
1597 return l < r ? l : r;
1598 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1599 return EXPR_CLASS_ERROR;
1600 } else {
1601 return is_constant_expression(expression);
1602 }
1603 }
1604
1605 case EXPR_REFERENCE: {
1606 entity_t *entity = expression->reference.entity;
1607 if (!is_declaration(entity))
1608 return EXPR_CLASS_VARIABLE;
1609
1610 type_t *type = skip_typeref(entity->declaration.type);
1611 if (is_type_function(type))
1612 return EXPR_CLASS_CONSTANT;
1613 if (is_type_array(type)) {
1614 return is_object_with_linker_constant_address(expression);
1615 }
1616 /* Prevent stray errors */
1617 if (!is_type_valid(type))
1618 return EXPR_CLASS_ERROR;
1619 return EXPR_CLASS_VARIABLE;
1620 }
1621
1622 case EXPR_ARRAY_ACCESS: {
1623 type_t *const type =
1624 skip_typeref(revert_automatic_type_conversion(expression));
1625 if (!is_type_array(type))
1626 return EXPR_CLASS_VARIABLE;
1627 return is_linker_constant(expression->array_access.array_ref);
1628 }
1629
1630 case EXPR_CONDITIONAL: {
1631 expression_t *const c = expression->conditional.condition;
1632 expression_classification_t const cclass = is_constant_expression(c);
1633 if (cclass != EXPR_CLASS_CONSTANT)
1634 return cclass;
1635
1636 if (fold_constant_to_bool(c)) {
1637 expression_t const *const t = expression->conditional.true_expression;
1638 return is_linker_constant(t != NULL ? t : c);
1639 } else {
1640 return is_linker_constant(expression->conditional.false_expression);
1641 }
1642 }
1643
1644 case EXPR_SELECT: {
1645 entity_t *entity = expression->select.compound_entry;
1646 if (!is_declaration(entity))
1647 return EXPR_CLASS_VARIABLE;
1648 type_t *type = skip_typeref(entity->declaration.type);
1649 if (is_type_array(type)) {
1650 /* arrays automatically convert to their address */
1651 expression_t *compound = expression->select.compound;
1652 type_t *base_type = skip_typeref(compound->base.type);
1653 if (is_type_pointer(base_type)) {
1654 /* it's a -> */
1655 return is_linker_constant(compound);
1656 } else {
1657 return is_object_with_linker_constant_address(compound);
1658 }
1659 }
1660 return EXPR_CLASS_VARIABLE;
1661 }
1662
1663 default:
1664 return is_constant_expression(expression);
1665 }
1666 }
1667
1668 /**
1669 * Check if the given expression is a call to a builtin function
1670 * returning a constant result.
1671 */
is_builtin_const_call(const expression_t * expression)1672 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1673 {
1674 expression_t *function = expression->call.function;
1675 if (function->kind != EXPR_REFERENCE)
1676 return EXPR_CLASS_VARIABLE;
1677 reference_expression_t *ref = &function->reference;
1678 if (ref->entity->kind != ENTITY_FUNCTION)
1679 return EXPR_CLASS_VARIABLE;
1680
1681 switch (ref->entity->function.btk) {
1682 case BUILTIN_INF:
1683 case BUILTIN_NAN:
1684 return EXPR_CLASS_CONSTANT;
1685 default:
1686 return EXPR_CLASS_VARIABLE;
1687 }
1688
1689 }
1690
is_constant_pointer(const expression_t * expression)1691 static expression_classification_t is_constant_pointer(const expression_t *expression)
1692 {
1693 expression_classification_t const expr_class = is_constant_expression(expression);
1694 if (expr_class != EXPR_CLASS_VARIABLE)
1695 return expr_class;
1696
1697 switch (expression->kind) {
1698 case EXPR_UNARY_CAST:
1699 return is_constant_pointer(expression->unary.value);
1700 default:
1701 return EXPR_CLASS_VARIABLE;
1702 }
1703 }
1704
is_object_with_constant_address(const expression_t * expression)1705 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1706 {
1707 switch (expression->kind) {
1708 case EXPR_SELECT: {
1709 expression_t *compound = expression->select.compound;
1710 type_t *compound_type = compound->base.type;
1711 compound_type = skip_typeref(compound_type);
1712 if (is_type_pointer(compound_type)) {
1713 return is_constant_pointer(compound);
1714 } else {
1715 return is_object_with_constant_address(compound);
1716 }
1717 }
1718
1719 case EXPR_ARRAY_ACCESS: {
1720 array_access_expression_t const* const array_access =
1721 &expression->array_access;
1722 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1723 if (idx_class != EXPR_CLASS_CONSTANT)
1724 return idx_class;
1725 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1726 expression_classification_t const ref_ptr = is_constant_pointer(array_access->array_ref);
1727 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1728 }
1729
1730 case EXPR_UNARY_DEREFERENCE:
1731 return is_constant_pointer(expression->unary.value);
1732
1733 case EXPR_ERROR:
1734 return EXPR_CLASS_ERROR;
1735
1736 default:
1737 return EXPR_CLASS_VARIABLE;
1738 }
1739 }
1740
is_constant_expression(const expression_t * expression)1741 expression_classification_t is_constant_expression(const expression_t *expression)
1742 {
1743 switch (expression->kind) {
1744 case EXPR_LITERAL_CHARACTER:
1745 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1746 case EXPR_ENUM_CONSTANT:
1747 case EXPR_LITERAL_BOOLEAN:
1748 case EXPR_LITERAL_MS_NOOP:
1749 return EXPR_CLASS_CONSTANT;
1750
1751 {
1752 type_t *type;
1753 case EXPR_ALIGNOF:
1754 type = skip_typeref(expression->typeprop.type);
1755 goto check_type;
1756
1757 case EXPR_CLASSIFY_TYPE:
1758 type = skip_typeref(expression->classify_type.type_expression->base.type);
1759 goto check_type;
1760
1761 case EXPR_LITERAL_INTEGER:
1762 case EXPR_LITERAL_FLOATINGPOINT:
1763 type = skip_typeref(expression->base.type);
1764 goto check_type;
1765
1766 case EXPR_OFFSETOF:
1767 type = skip_typeref(expression->offsetofe.type);
1768 goto check_type;
1769
1770 case EXPR_SIZEOF:
1771 type = skip_typeref(expression->typeprop.type);
1772 if (is_type_array(type) && type->array.is_vla)
1773 return EXPR_CLASS_VARIABLE;
1774 goto check_type;
1775
1776 check_type:
1777 return is_type_valid(type) ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1778 }
1779
1780 case EXPR_BUILTIN_CONSTANT_P: {
1781 expression_classification_t const c = is_constant_expression(expression->builtin_constant.value);
1782 return c != EXPR_CLASS_ERROR ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1783 }
1784
1785 case EXPR_STRING_LITERAL:
1786 case EXPR_FUNCNAME:
1787 case EXPR_LABEL_ADDRESS:
1788 case EXPR_SELECT:
1789 case EXPR_VA_START:
1790 case EXPR_VA_ARG:
1791 case EXPR_VA_COPY:
1792 case EXPR_STATEMENT:
1793 case EXPR_UNARY_POSTFIX_INCREMENT:
1794 case EXPR_UNARY_POSTFIX_DECREMENT:
1795 case EXPR_UNARY_PREFIX_INCREMENT:
1796 case EXPR_UNARY_PREFIX_DECREMENT:
1797 case EXPR_UNARY_ASSUME: /* has VOID type */
1798 case EXPR_UNARY_DEREFERENCE:
1799 case EXPR_UNARY_DELETE:
1800 case EXPR_UNARY_DELETE_ARRAY:
1801 case EXPR_UNARY_THROW:
1802 case EXPR_BINARY_ASSIGN:
1803 case EXPR_BINARY_MUL_ASSIGN:
1804 case EXPR_BINARY_DIV_ASSIGN:
1805 case EXPR_BINARY_MOD_ASSIGN:
1806 case EXPR_BINARY_ADD_ASSIGN:
1807 case EXPR_BINARY_SUB_ASSIGN:
1808 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1809 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1810 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1811 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1812 case EXPR_BINARY_BITWISE_OR_ASSIGN:
1813 case EXPR_BINARY_COMMA:
1814 case EXPR_ARRAY_ACCESS:
1815 return EXPR_CLASS_VARIABLE;
1816
1817 case EXPR_REFERENCE: {
1818 type_t *const type = skip_typeref(expression->base.type);
1819 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1820 }
1821
1822 case EXPR_UNARY_TAKE_ADDRESS:
1823 return is_object_with_constant_address(expression->unary.value);
1824
1825 case EXPR_CALL:
1826 return is_builtin_const_call(expression);
1827
1828 case EXPR_UNARY_NEGATE:
1829 case EXPR_UNARY_PLUS:
1830 case EXPR_UNARY_BITWISE_NEGATE:
1831 case EXPR_UNARY_NOT:
1832 return is_constant_expression(expression->unary.value);
1833
1834 case EXPR_UNARY_CAST: {
1835 type_t *const type = skip_typeref(expression->base.type);
1836 if (is_type_scalar(type))
1837 return is_constant_expression(expression->unary.value);
1838 if (!is_type_valid(type))
1839 return EXPR_CLASS_ERROR;
1840 return EXPR_CLASS_VARIABLE;
1841 }
1842
1843 case EXPR_BINARY_ADD:
1844 case EXPR_BINARY_SUB:
1845 case EXPR_BINARY_MUL:
1846 case EXPR_BINARY_DIV:
1847 case EXPR_BINARY_MOD:
1848 case EXPR_BINARY_EQUAL:
1849 case EXPR_BINARY_NOTEQUAL:
1850 case EXPR_BINARY_LESS:
1851 case EXPR_BINARY_LESSEQUAL:
1852 case EXPR_BINARY_GREATER:
1853 case EXPR_BINARY_GREATEREQUAL:
1854 case EXPR_BINARY_BITWISE_AND:
1855 case EXPR_BINARY_BITWISE_OR:
1856 case EXPR_BINARY_BITWISE_XOR:
1857 case EXPR_BINARY_SHIFTLEFT:
1858 case EXPR_BINARY_SHIFTRIGHT:
1859 case EXPR_BINARY_ISGREATER:
1860 case EXPR_BINARY_ISGREATEREQUAL:
1861 case EXPR_BINARY_ISLESS:
1862 case EXPR_BINARY_ISLESSEQUAL:
1863 case EXPR_BINARY_ISLESSGREATER:
1864 case EXPR_BINARY_ISUNORDERED: {
1865 expression_classification_t const l = is_constant_expression(expression->binary.left);
1866 expression_classification_t const r = is_constant_expression(expression->binary.right);
1867 return l < r ? l : r;
1868 }
1869
1870 case EXPR_BINARY_LOGICAL_AND: {
1871 expression_t const *const left = expression->binary.left;
1872 expression_classification_t const lclass = is_constant_expression(left);
1873 if (lclass != EXPR_CLASS_CONSTANT)
1874 return lclass;
1875 if (!fold_constant_to_bool(left))
1876 return EXPR_CLASS_CONSTANT;
1877 return is_constant_expression(expression->binary.right);
1878 }
1879
1880 case EXPR_BINARY_LOGICAL_OR: {
1881 expression_t const *const left = expression->binary.left;
1882 expression_classification_t const lclass = is_constant_expression(left);
1883 if (lclass != EXPR_CLASS_CONSTANT)
1884 return lclass;
1885 if (fold_constant_to_bool(left))
1886 return EXPR_CLASS_CONSTANT;
1887 return is_constant_expression(expression->binary.right);
1888 }
1889
1890 case EXPR_COMPOUND_LITERAL:
1891 return is_constant_initializer(expression->compound_literal.initializer);
1892
1893 case EXPR_CONDITIONAL: {
1894 expression_t *const condition = expression->conditional.condition;
1895 expression_classification_t const cclass = is_constant_expression(condition);
1896 if (cclass != EXPR_CLASS_CONSTANT)
1897 return cclass;
1898
1899 if (fold_constant_to_bool(condition)) {
1900 expression_t const *const t = expression->conditional.true_expression;
1901 return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1902 } else {
1903 return is_constant_expression(expression->conditional.false_expression);
1904 }
1905 }
1906
1907 case EXPR_ERROR:
1908 return EXPR_CLASS_ERROR;
1909 }
1910 panic("invalid expression");
1911 }
1912
init_ast(void)1913 void init_ast(void)
1914 {
1915 obstack_init(&ast_obstack);
1916 }
1917
exit_ast(void)1918 void exit_ast(void)
1919 {
1920 obstack_free(&ast_obstack, NULL);
1921 }
1922