1 /* Check calls to formatted I/O functions (-Wformat).
2 Copyright (C) 1992-2016 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #include "config.h"
21 #include "system.h"
22 #include "coretypes.h"
23 #include "tm.h"
24 #include "c-target.h"
25 #include "c-common.h"
26 #include "alloc-pool.h"
27 #include "stringpool.h"
28 #include "c-objc.h"
29 #include "intl.h"
30 #include "langhooks.h"
31 #include "c-format.h"
32
33 /* Handle attributes associated with format checking. */
34
35 /* This must be in the same order as format_types, except for
36 format_type_error. Target-specific format types do not have
37 matching enum values. */
38 enum format_type { printf_format_type, asm_fprintf_format_type,
39 gcc_diag_format_type, gcc_tdiag_format_type,
40 gcc_cdiag_format_type,
41 gcc_cxxdiag_format_type, gcc_gfc_format_type,
42 gcc_objc_string_format_type,
43 format_type_error = -1};
44
45 struct function_format_info
46 {
47 int format_type; /* type of format (printf, scanf, etc.) */
48 unsigned HOST_WIDE_INT format_num; /* number of format argument */
49 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */
50 };
51
52 static bool decode_format_attr (tree, function_format_info *, int);
53 static int decode_format_type (const char *);
54
55 static bool check_format_string (tree argument,
56 unsigned HOST_WIDE_INT format_num,
57 int flags, bool *no_add_attrs,
58 int expected_format_type);
59 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
60 int validated_p);
61 static const char *convert_format_name_to_system_name (const char *attr_name);
62 static bool cmp_attribs (const char *tattr_name, const char *attr_name);
63
64 static int first_target_format_type;
65 static const char *format_name (int format_num);
66 static int format_flags (int format_num);
67
68 /* Given a string S of length LINE_WIDTH, find the visual column
69 corresponding to OFFSET bytes. */
70
71 static unsigned int
location_column_from_byte_offset(const char * s,int line_width,unsigned int offset)72 location_column_from_byte_offset (const char *s, int line_width,
73 unsigned int offset)
74 {
75 const char * c = s;
76 if (*c != '"')
77 return 0;
78
79 c++, offset--;
80 while (offset > 0)
81 {
82 if (c - s >= line_width)
83 return 0;
84
85 switch (*c)
86 {
87 case '\\':
88 c++;
89 if (c - s >= line_width)
90 return 0;
91 switch (*c)
92 {
93 case '\\': case '\'': case '"': case '?':
94 case '(': case '{': case '[': case '%':
95 case 'a': case 'b': case 'f': case 'n':
96 case 'r': case 't': case 'v':
97 case 'e': case 'E':
98 c++, offset--;
99 break;
100
101 default:
102 return 0;
103 }
104 break;
105
106 case '"':
107 /* We found the end of the string too early. */
108 return 0;
109
110 default:
111 c++, offset--;
112 break;
113 }
114 }
115 return c - s;
116 }
117
118 /* Return a location that encodes the same location as LOC but shifted
119 by OFFSET bytes. */
120
121 static location_t
location_from_offset(location_t loc,int offset)122 location_from_offset (location_t loc, int offset)
123 {
124 gcc_checking_assert (offset >= 0);
125 if (linemap_location_from_macro_expansion_p (line_table, loc)
126 || offset < 0)
127 return loc;
128
129 expanded_location s = expand_location_to_spelling_point (loc);
130 int line_width;
131 const char *line = location_get_source_line (s.file, s.line, &line_width);
132 if (line == NULL)
133 return loc;
134 line += s.column - 1 ;
135 line_width -= s.column - 1;
136 unsigned int column =
137 location_column_from_byte_offset (line, line_width, (unsigned) offset);
138
139 return linemap_position_for_loc_and_offset (line_table, loc, column);
140 }
141
142 /* Check that we have a pointer to a string suitable for use as a format.
143 The default is to check for a char type.
144 For objective-c dialects, this is extended to include references to string
145 objects validated by objc_string_ref_type_p ().
146 Targets may also provide a string object type that can be used within c and
147 c++ and shared with their respective objective-c dialects. In this case the
148 reference to a format string is checked for validity via a hook.
149
150 The function returns true if strref points to any string type valid for the
151 language dialect and target. */
152
153 static bool
valid_stringptr_type_p(tree strref)154 valid_stringptr_type_p (tree strref)
155 {
156 return (strref != NULL
157 && TREE_CODE (strref) == POINTER_TYPE
158 && (TYPE_MAIN_VARIANT (TREE_TYPE (strref)) == char_type_node
159 || objc_string_ref_type_p (strref)
160 || (*targetcm.string_object_ref_type_p) ((const_tree) strref)));
161 }
162
163 /* Handle a "format_arg" attribute; arguments as in
164 struct attribute_spec.handler. */
165 tree
handle_format_arg_attribute(tree * node,tree ARG_UNUSED (name),tree args,int flags,bool * no_add_attrs)166 handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
167 tree args, int flags, bool *no_add_attrs)
168 {
169 tree type = *node;
170 tree format_num_expr = TREE_VALUE (args);
171 unsigned HOST_WIDE_INT format_num = 0;
172
173 if (!get_constant (format_num_expr, &format_num, 0))
174 {
175 error ("format string has invalid operand number");
176 *no_add_attrs = true;
177 return NULL_TREE;
178 }
179
180 if (prototype_p (type))
181 {
182 /* The format arg can be any string reference valid for the language and
183 target. We cannot be more specific in this case. */
184 if (!check_format_string (type, format_num, flags, no_add_attrs, -1))
185 return NULL_TREE;
186 }
187
188 if (!valid_stringptr_type_p (TREE_TYPE (type)))
189 {
190 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
191 error ("function does not return string type");
192 *no_add_attrs = true;
193 return NULL_TREE;
194 }
195
196 return NULL_TREE;
197 }
198
199 /* Verify that the format_num argument is actually a string reference suitable,
200 for the language dialect and target (in case the format attribute is in
201 error). When we know the specific reference type expected, this is also
202 checked. */
203 static bool
check_format_string(tree fntype,unsigned HOST_WIDE_INT format_num,int flags,bool * no_add_attrs,int expected_format_type)204 check_format_string (tree fntype, unsigned HOST_WIDE_INT format_num,
205 int flags, bool *no_add_attrs, int expected_format_type)
206 {
207 unsigned HOST_WIDE_INT i;
208 bool is_objc_sref, is_target_sref, is_char_ref;
209 tree ref;
210 int fmt_flags;
211 function_args_iterator iter;
212
213 i = 1;
214 FOREACH_FUNCTION_ARGS (fntype, ref, iter)
215 {
216 if (i == format_num)
217 break;
218 i++;
219 }
220
221 if (!ref
222 || !valid_stringptr_type_p (ref))
223 {
224 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
225 error ("format string argument is not a string type");
226 *no_add_attrs = true;
227 return false;
228 }
229
230 /* We only know that we want a suitable string reference. */
231 if (expected_format_type < 0)
232 return true;
233
234 /* Now check that the arg matches the expected type. */
235 is_char_ref =
236 (TYPE_MAIN_VARIANT (TREE_TYPE (ref)) == char_type_node);
237
238 fmt_flags = format_flags (expected_format_type);
239 is_objc_sref = is_target_sref = false;
240 if (!is_char_ref)
241 is_objc_sref = objc_string_ref_type_p (ref);
242
243 if (!(fmt_flags & FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL))
244 {
245 if (is_char_ref)
246 return true; /* OK, we expected a char and found one. */
247 else
248 {
249 /* We expected a char but found an extended string type. */
250 if (is_objc_sref)
251 error ("found a %<%s%> reference but the format argument should"
252 " be a string", format_name (gcc_objc_string_format_type));
253 else
254 error ("found a %qT but the format argument should be a string",
255 ref);
256 *no_add_attrs = true;
257 return false;
258 }
259 }
260
261 /* We expect a string object type as the format arg. */
262 if (is_char_ref)
263 {
264 error ("format argument should be a %<%s%> reference but"
265 " a string was found", format_name (expected_format_type));
266 *no_add_attrs = true;
267 return false;
268 }
269
270 /* We will assert that objective-c will support either its own string type
271 or the target-supplied variant. */
272 if (!is_objc_sref)
273 is_target_sref = (*targetcm.string_object_ref_type_p) ((const_tree) ref);
274
275 if (expected_format_type == (int) gcc_objc_string_format_type
276 && (is_objc_sref || is_target_sref))
277 return true;
278
279 /* We will allow a target string ref to match only itself. */
280 if (first_target_format_type
281 && expected_format_type >= first_target_format_type
282 && is_target_sref)
283 return true;
284 else
285 {
286 error ("format argument should be a %<%s%> reference",
287 format_name (expected_format_type));
288 *no_add_attrs = true;
289 return false;
290 }
291
292 gcc_unreachable ();
293 }
294
295 /* Verify EXPR is a constant, and store its value.
296 If validated_p is true there should be no errors.
297 Returns true on success, false otherwise. */
298 static bool
get_constant(tree expr,unsigned HOST_WIDE_INT * value,int validated_p)299 get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
300 {
301 if (!tree_fits_uhwi_p (expr))
302 {
303 gcc_assert (!validated_p);
304 return false;
305 }
306
307 *value = TREE_INT_CST_LOW (expr);
308
309 return true;
310 }
311
312 /* Decode the arguments to a "format" attribute into a
313 function_format_info structure. It is already known that the list
314 is of the right length. If VALIDATED_P is true, then these
315 attributes have already been validated and must not be erroneous;
316 if false, it will give an error message. Returns true if the
317 attributes are successfully decoded, false otherwise. */
318
319 static bool
decode_format_attr(tree args,function_format_info * info,int validated_p)320 decode_format_attr (tree args, function_format_info *info, int validated_p)
321 {
322 tree format_type_id = TREE_VALUE (args);
323 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
324 tree first_arg_num_expr
325 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
326
327 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
328 {
329 gcc_assert (!validated_p);
330 error ("unrecognized format specifier");
331 return false;
332 }
333 else
334 {
335 const char *p = IDENTIFIER_POINTER (format_type_id);
336
337 p = convert_format_name_to_system_name (p);
338
339 info->format_type = decode_format_type (p);
340
341 if (!c_dialect_objc ()
342 && info->format_type == gcc_objc_string_format_type)
343 {
344 gcc_assert (!validated_p);
345 warning (OPT_Wformat_, "%qE is only allowed in Objective-C dialects",
346 format_type_id);
347 info->format_type = format_type_error;
348 return false;
349 }
350
351 if (info->format_type == format_type_error)
352 {
353 gcc_assert (!validated_p);
354 warning (OPT_Wformat_, "%qE is an unrecognized format function type",
355 format_type_id);
356 return false;
357 }
358 }
359
360 if (!get_constant (format_num_expr, &info->format_num, validated_p))
361 {
362 error ("format string has invalid operand number");
363 return false;
364 }
365
366 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
367 {
368 error ("%<...%> has invalid operand number");
369 return false;
370 }
371
372 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
373 {
374 gcc_assert (!validated_p);
375 error ("format string argument follows the args to be formatted");
376 return false;
377 }
378
379 return true;
380 }
381
382 /* Check a call to a format function against a parameter list. */
383
384 /* The C standard version C++ is treated as equivalent to
385 or inheriting from, for the purpose of format features supported. */
386 #define CPLUSPLUS_STD_VER (cxx_dialect < cxx11 ? STD_C94 : STD_C99)
387 /* The C standard version we are checking formats against when pedantic. */
388 #define C_STD_VER ((int) (c_dialect_cxx () \
389 ? CPLUSPLUS_STD_VER \
390 : (flag_isoc99 \
391 ? STD_C99 \
392 : (flag_isoc94 ? STD_C94 : STD_C89))))
393 /* The name to give to the standard version we are warning about when
394 pedantic. FEATURE_VER is the version in which the feature warned out
395 appeared, which is higher than C_STD_VER. */
396 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
397 ? (cxx_dialect < cxx11 ? "ISO C++98" \
398 : "ISO C++11") \
399 : ((FEATURE_VER) == STD_EXT \
400 ? "ISO C" \
401 : "ISO C90"))
402 /* Adjust a C standard version, which may be STD_C9L, to account for
403 -Wno-long-long. Returns other standard versions unchanged. */
404 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
405 ? (warn_long_long ? STD_C99 : STD_C89) \
406 : (VER)))
407
408 /* Enum describing the kind of specifiers present in the format and
409 requiring an argument. */
410 enum format_specifier_kind {
411 CF_KIND_FORMAT,
412 CF_KIND_FIELD_WIDTH,
413 CF_KIND_FIELD_PRECISION
414 };
415
416 static const char *kind_descriptions[] = {
417 N_("format"),
418 N_("field width specifier"),
419 N_("field precision specifier")
420 };
421
422 /* Structure describing details of a type expected in format checking,
423 and the type to check against it. */
424 struct format_wanted_type
425 {
426 /* The type wanted. */
427 tree wanted_type;
428 /* The name of this type to use in diagnostics. */
429 const char *wanted_type_name;
430 /* Should be type checked just for scalar width identity. */
431 int scalar_identity_flag;
432 /* The level of indirection through pointers at which this type occurs. */
433 int pointer_count;
434 /* Whether, when pointer_count is 1, to allow any character type when
435 pedantic, rather than just the character or void type specified. */
436 int char_lenient_flag;
437 /* Whether the argument, dereferenced once, is written into and so the
438 argument must not be a pointer to a const-qualified type. */
439 int writing_in_flag;
440 /* Whether the argument, dereferenced once, is read from and so
441 must not be a NULL pointer. */
442 int reading_from_flag;
443 /* The kind of specifier that this type is used for. */
444 enum format_specifier_kind kind;
445 /* The starting character of the specifier. This never includes the
446 initial percent sign. */
447 const char *format_start;
448 /* The length of the specifier. */
449 int format_length;
450 /* The actual parameter to check against the wanted type. */
451 tree param;
452 /* The argument number of that parameter. */
453 int arg_num;
454 /* The offset location of this argument with respect to the format
455 string location. */
456 unsigned int offset_loc;
457 /* The next type to check for this format conversion, or NULL if none. */
458 struct format_wanted_type *next;
459 };
460
461 /* Convenience macro for format_length_info meaning unused. */
462 #define NO_FMT NULL, FMT_LEN_none, STD_C89
463
464 static const format_length_info printf_length_specs[] =
465 {
466 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 },
467 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 },
468 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 },
469 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
470 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 },
471 { "Z", FMT_LEN_z, STD_EXT, NO_FMT, 0 },
472 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 },
473 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 },
474 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 },
475 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 },
476 { NO_FMT, NO_FMT, 0 }
477 };
478
479 /* Length specifiers valid for asm_fprintf. */
480 static const format_length_info asm_fprintf_length_specs[] =
481 {
482 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
483 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
484 { NO_FMT, NO_FMT, 0 }
485 };
486
487 /* Length specifiers valid for GCC diagnostics. */
488 static const format_length_info gcc_diag_length_specs[] =
489 {
490 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
491 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
492 { NO_FMT, NO_FMT, 0 }
493 };
494
495 /* The custom diagnostics all accept the same length specifiers. */
496 #define gcc_tdiag_length_specs gcc_diag_length_specs
497 #define gcc_cdiag_length_specs gcc_diag_length_specs
498 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
499
500 /* This differs from printf_length_specs only in that "Z" is not accepted. */
501 static const format_length_info scanf_length_specs[] =
502 {
503 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 },
504 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 },
505 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 },
506 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
507 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 },
508 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 },
509 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 },
510 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 },
511 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 },
512 { NO_FMT, NO_FMT, 0 }
513 };
514
515
516 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
517 make no sense for a format type not part of any C standard version. */
518 static const format_length_info strfmon_length_specs[] =
519 {
520 /* A GNU extension. */
521 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
522 { NO_FMT, NO_FMT, 0 }
523 };
524
525
526 /* For now, the Fortran front-end routines only use l as length modifier. */
527 static const format_length_info gcc_gfc_length_specs[] =
528 {
529 { "l", FMT_LEN_l, STD_C89, NO_FMT, 0 },
530 { NO_FMT, NO_FMT, 0 }
531 };
532
533
534 static const format_flag_spec printf_flag_specs[] =
535 {
536 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
537 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
538 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
539 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
540 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
541 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
542 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
543 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
544 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
545 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
546 { 0, 0, 0, NULL, NULL, STD_C89 }
547 };
548
549
550 static const format_flag_pair printf_flag_pairs[] =
551 {
552 { ' ', '+', 1, 0 },
553 { '0', '-', 1, 0 },
554 { '0', 'p', 1, 'i' },
555 { 0, 0, 0, 0 }
556 };
557
558 static const format_flag_spec asm_fprintf_flag_specs[] =
559 {
560 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
561 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
562 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
563 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
564 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
565 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
566 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
567 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
568 { 0, 0, 0, NULL, NULL, STD_C89 }
569 };
570
571 static const format_flag_pair asm_fprintf_flag_pairs[] =
572 {
573 { ' ', '+', 1, 0 },
574 { '0', '-', 1, 0 },
575 { '0', 'p', 1, 'i' },
576 { 0, 0, 0, 0 }
577 };
578
579 static const format_flag_pair gcc_diag_flag_pairs[] =
580 {
581 { 0, 0, 0, 0 }
582 };
583
584 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
585 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
586 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
587 #define gcc_gfc_flag_pairs gcc_diag_flag_pairs
588
589 static const format_flag_spec gcc_diag_flag_specs[] =
590 {
591 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
592 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
593 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
594 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
595 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
596 { 0, 0, 0, NULL, NULL, STD_C89 }
597 };
598
599 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
600 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
601 #define gcc_cxxdiag_flag_specs gcc_diag_flag_specs
602 #define gcc_gfc_flag_specs gcc_diag_flag_specs
603
604 static const format_flag_spec scanf_flag_specs[] =
605 {
606 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
607 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
608 { 'm', 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT },
609 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
610 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
611 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
612 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
613 { 0, 0, 0, NULL, NULL, STD_C89 }
614 };
615
616
617 static const format_flag_pair scanf_flag_pairs[] =
618 {
619 { '*', 'L', 0, 0 },
620 { 'a', 'm', 0, 0 },
621 { 0, 0, 0, 0 }
622 };
623
624
625 static const format_flag_spec strftime_flag_specs[] =
626 {
627 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
628 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
629 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
630 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
631 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
632 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
633 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
634 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
635 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
636 { 0, 0, 0, NULL, NULL, STD_C89 }
637 };
638
639
640 static const format_flag_pair strftime_flag_pairs[] =
641 {
642 { 'E', 'O', 0, 0 },
643 { '_', '-', 0, 0 },
644 { '_', '0', 0, 0 },
645 { '-', '0', 0, 0 },
646 { '^', '#', 0, 0 },
647 { 0, 0, 0, 0 }
648 };
649
650
651 static const format_flag_spec strfmon_flag_specs[] =
652 {
653 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
654 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
655 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
656 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
657 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
658 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
659 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
660 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
661 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
662 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
663 { 0, 0, 0, NULL, NULL, STD_C89 }
664 };
665
666 static const format_flag_pair strfmon_flag_pairs[] =
667 {
668 { '+', '(', 0, 0 },
669 { 0, 0, 0, 0 }
670 };
671
672
673 static const format_char_info print_char_table[] =
674 {
675 /* C89 conversion specifiers. */
676 { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "-wp0 +'I", "i", NULL },
677 { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
678 { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "-wp0'I", "i", NULL },
679 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#'I", "", NULL },
680 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#I", "", NULL },
681 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
682 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
683 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
684 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "", "W", NULL },
685 /* C99 conversion specifiers. */
686 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#'I", "", NULL },
687 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
688 /* X/Open conversion specifiers. */
689 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
690 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
691 /* GNU conversion specifiers. */
692 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
693 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
694 };
695
696 static const format_char_info asm_fprintf_char_table[] =
697 {
698 /* C89 conversion specifiers. */
699 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
700 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
701 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
702 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
703 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
704
705 /* asm_fprintf conversion specifiers. */
706 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
707 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
708 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
709 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
710 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
711 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
712 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
713 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
714 };
715
716 static const format_char_info gcc_diag_char_table[] =
717 {
718 /* C89 conversion specifiers. */
719 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
720 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
721 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
722 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
723 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
724 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
725
726 /* Custom conversion specifiers. */
727
728 /* These will require a "tree" at runtime. */
729 { "K", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
730
731 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
732 { "<>'R",0, STD_C89, NOARGUMENTS, "", "", NULL },
733 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
734 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
735 };
736
737 static const format_char_info gcc_tdiag_char_table[] =
738 {
739 /* C89 conversion specifiers. */
740 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
741 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
742 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
743 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
744 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
745 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
746
747 /* Custom conversion specifiers. */
748
749 /* These will require a "tree" at runtime. */
750 { "DFKTEV", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
751
752 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
753
754 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
755 { "<>'R",0, STD_C89, NOARGUMENTS, "", "", NULL },
756 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
757 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
758 };
759
760 static const format_char_info gcc_cdiag_char_table[] =
761 {
762 /* C89 conversion specifiers. */
763 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
764 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
765 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
766 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
767 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
768 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
769
770 /* Custom conversion specifiers. */
771
772 /* These will require a "tree" at runtime. */
773 { "DEFKTV", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
774
775 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
776
777 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
778 { "<>'R",0, STD_C89, NOARGUMENTS, "", "", NULL },
779 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
780 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
781 };
782
783 static const format_char_info gcc_cxxdiag_char_table[] =
784 {
785 /* C89 conversion specifiers. */
786 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
787 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
788 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
789 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
790 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
791 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
792
793 /* Custom conversion specifiers. */
794
795 /* These will require a "tree" at runtime. */
796 { "ADEFKSTVX",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
797
798 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
799
800 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
801 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
802
803 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
804 { "<>'R",0, STD_C89, NOARGUMENTS, "", "", NULL },
805 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
806 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
807 };
808
809 static const format_char_info gcc_gfc_char_table[] =
810 {
811 /* C89 conversion specifiers. */
812 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
813 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
814 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
815 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "cR", NULL },
816
817 /* gfc conversion specifiers. */
818
819 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
820
821 /* This will require a "locus" at runtime. */
822 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
823
824 /* These will require nothing. */
825 { "<>",0, STD_C89, NOARGUMENTS, "", "", NULL },
826 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
827 };
828
829 static const format_char_info scan_char_table[] =
830 {
831 /* C89 conversion specifiers. */
832 { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "*w'I", "W", NULL },
833 { "u", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "*w'I", "W", NULL },
834 { "oxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
835 { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "*w'", "W", NULL },
836 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL },
837 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL },
838 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL },
839 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
840 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "", "W", NULL },
841 /* C99 conversion specifiers. */
842 { "F", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "*w'", "W", NULL },
843 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
844 /* X/Open conversion specifiers. */
845 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL },
846 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL },
847 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
848 };
849
850 static const format_char_info time_char_table[] =
851 {
852 /* C89 conversion specifiers. */
853 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
854 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
855 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
856 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
857 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
858 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
859 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
860 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
861 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
862 /* C99 conversion specifiers. */
863 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
864 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
865 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
866 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
867 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
868 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
869 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
870 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
871 /* GNU conversion specifiers. */
872 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
873 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
874 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
875 };
876
877 static const format_char_info monetary_char_table[] =
878 {
879 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
880 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
881 };
882
883 /* This must be in the same order as enum format_type. */
884 static const format_kind_info format_types_orig[] =
885 {
886 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
887 printf_flag_specs, printf_flag_pairs,
888 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
889 'w', 0, 'p', 0, 'L', 0,
890 &integer_type_node, &integer_type_node
891 },
892 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
893 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
894 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
895 'w', 0, 'p', 0, 'L', 0,
896 NULL, NULL
897 },
898 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+#", NULL,
899 gcc_diag_flag_specs, gcc_diag_flag_pairs,
900 FMT_FLAG_ARG_CONVERT,
901 0, 0, 'p', 0, 'L', 0,
902 NULL, &integer_type_node
903 },
904 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+#", NULL,
905 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
906 FMT_FLAG_ARG_CONVERT,
907 0, 0, 'p', 0, 'L', 0,
908 NULL, &integer_type_node
909 },
910 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+#", NULL,
911 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
912 FMT_FLAG_ARG_CONVERT,
913 0, 0, 'p', 0, 'L', 0,
914 NULL, &integer_type_node
915 },
916 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
917 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
918 FMT_FLAG_ARG_CONVERT,
919 0, 0, 'p', 0, 'L', 0,
920 NULL, &integer_type_node
921 },
922 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "q+#", NULL,
923 gcc_gfc_flag_specs, gcc_gfc_flag_pairs,
924 FMT_FLAG_ARG_CONVERT,
925 0, 0, 0, 0, 0, 0,
926 NULL, NULL
927 },
928 { "NSString", NULL, NULL, NULL, NULL,
929 NULL, NULL,
930 FMT_FLAG_ARG_CONVERT|FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL, 0, 0, 0, 0, 0, 0,
931 NULL, NULL
932 },
933 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
934 scanf_flag_specs, scanf_flag_pairs,
935 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
936 'w', 0, 0, '*', 'L', 'm',
937 NULL, NULL
938 },
939 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
940 strftime_flag_specs, strftime_flag_pairs,
941 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
942 NULL, NULL
943 },
944 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
945 strfmon_flag_specs, strfmon_flag_pairs,
946 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
947 NULL, NULL
948 }
949 };
950
951 /* This layer of indirection allows GCC to reassign format_types with
952 new data if necessary, while still allowing the original data to be
953 const. */
954 static const format_kind_info *format_types = format_types_orig;
955 /* We can modify this one. We also add target-specific format types
956 to the end of the array. */
957 static format_kind_info *dynamic_format_types;
958
959 static int n_format_types = ARRAY_SIZE (format_types_orig);
960
961 /* Structure detailing the results of checking a format function call
962 where the format expression may be a conditional expression with
963 many leaves resulting from nested conditional expressions. */
964 struct format_check_results
965 {
966 /* Number of leaves of the format argument that could not be checked
967 as they were not string literals. */
968 int number_non_literal;
969 /* Number of leaves of the format argument that were null pointers or
970 string literals, but had extra format arguments. */
971 int number_extra_args;
972 location_t extra_arg_loc;
973 /* Number of leaves of the format argument that were null pointers or
974 string literals, but had extra format arguments and used $ operand
975 numbers. */
976 int number_dollar_extra_args;
977 /* Number of leaves of the format argument that were wide string
978 literals. */
979 int number_wide;
980 /* Number of leaves of the format argument that were empty strings. */
981 int number_empty;
982 /* Number of leaves of the format argument that were unterminated
983 strings. */
984 int number_unterminated;
985 /* Number of leaves of the format argument that were not counted above. */
986 int number_other;
987 /* Location of the format string. */
988 location_t format_string_loc;
989 };
990
991 struct format_check_context
992 {
993 format_check_results *res;
994 function_format_info *info;
995 tree params;
996 };
997
998 /* Return the format name (as specified in the original table) for the format
999 type indicated by format_num. */
1000 static const char *
format_name(int format_num)1001 format_name (int format_num)
1002 {
1003 if (format_num >= 0 && format_num < n_format_types)
1004 return format_types[format_num].name;
1005 gcc_unreachable ();
1006 }
1007
1008 /* Return the format flags (as specified in the original table) for the format
1009 type indicated by format_num. */
1010 static int
format_flags(int format_num)1011 format_flags (int format_num)
1012 {
1013 if (format_num >= 0 && format_num < n_format_types)
1014 return format_types[format_num].flags;
1015 gcc_unreachable ();
1016 }
1017
1018 static void check_format_info (function_format_info *, tree);
1019 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
1020 static void check_format_info_main (format_check_results *,
1021 function_format_info *,
1022 const char *, int, tree,
1023 unsigned HOST_WIDE_INT,
1024 object_allocator<format_wanted_type> &);
1025
1026 static void init_dollar_format_checking (int, tree);
1027 static int maybe_read_dollar_number (const char **, int,
1028 tree, tree *, const format_kind_info *);
1029 static bool avoid_dollar_number (const char *);
1030 static void finish_dollar_format_checking (format_check_results *, int);
1031
1032 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
1033 int, const char *);
1034
1035 static void check_format_types (location_t, format_wanted_type *);
1036 static void format_type_warning (location_t, format_wanted_type *, tree, tree);
1037
1038 /* Decode a format type from a string, returning the type, or
1039 format_type_error if not valid, in which case the caller should print an
1040 error message. */
1041 static int
decode_format_type(const char * s)1042 decode_format_type (const char *s)
1043 {
1044 int i;
1045 int slen;
1046
1047 s = convert_format_name_to_system_name (s);
1048 slen = strlen (s);
1049 for (i = 0; i < n_format_types; i++)
1050 {
1051 int alen;
1052 if (!strcmp (s, format_types[i].name))
1053 return i;
1054 alen = strlen (format_types[i].name);
1055 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
1056 && s[slen - 1] == '_' && s[slen - 2] == '_'
1057 && !strncmp (s + 2, format_types[i].name, alen))
1058 return i;
1059 }
1060 return format_type_error;
1061 }
1062
1063
1064 /* Check the argument list of a call to printf, scanf, etc.
1065 ATTRS are the attributes on the function type. There are NARGS argument
1066 values in the array ARGARRAY.
1067 Also, if -Wsuggest-attribute=format,
1068 warn for calls to vprintf or vscanf in functions with no such format
1069 attribute themselves. */
1070
1071 void
check_function_format(tree attrs,int nargs,tree * argarray)1072 check_function_format (tree attrs, int nargs, tree *argarray)
1073 {
1074 tree a;
1075
1076 /* See if this function has any format attributes. */
1077 for (a = attrs; a; a = TREE_CHAIN (a))
1078 {
1079 if (is_attribute_p ("format", TREE_PURPOSE (a)))
1080 {
1081 /* Yup; check it. */
1082 function_format_info info;
1083 decode_format_attr (TREE_VALUE (a), &info, /*validated=*/true);
1084 if (warn_format)
1085 {
1086 /* FIXME: Rewrite all the internal functions in this file
1087 to use the ARGARRAY directly instead of constructing this
1088 temporary list. */
1089 tree params = NULL_TREE;
1090 int i;
1091 for (i = nargs - 1; i >= 0; i--)
1092 params = tree_cons (NULL_TREE, argarray[i], params);
1093 check_format_info (&info, params);
1094 }
1095 if (warn_suggest_attribute_format && info.first_arg_num == 0
1096 && (format_types[info.format_type].flags
1097 & (int) FMT_FLAG_ARG_CONVERT))
1098 {
1099 tree c;
1100 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
1101 c;
1102 c = TREE_CHAIN (c))
1103 if (is_attribute_p ("format", TREE_PURPOSE (c))
1104 && (decode_format_type (IDENTIFIER_POINTER
1105 (TREE_VALUE (TREE_VALUE (c))))
1106 == info.format_type))
1107 break;
1108 if (c == NULL_TREE)
1109 {
1110 /* Check if the current function has a parameter to which
1111 the format attribute could be attached; if not, it
1112 can't be a candidate for a format attribute, despite
1113 the vprintf-like or vscanf-like call. */
1114 tree args;
1115 for (args = DECL_ARGUMENTS (current_function_decl);
1116 args != 0;
1117 args = DECL_CHAIN (args))
1118 {
1119 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
1120 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
1121 == char_type_node))
1122 break;
1123 }
1124 if (args != 0)
1125 warning (OPT_Wsuggest_attribute_format, "function might "
1126 "be possible candidate for %qs format attribute",
1127 format_types[info.format_type].name);
1128 }
1129 }
1130 }
1131 }
1132 }
1133
1134
1135 /* Variables used by the checking of $ operand number formats. */
1136 static char *dollar_arguments_used = NULL;
1137 static char *dollar_arguments_pointer_p = NULL;
1138 static int dollar_arguments_alloc = 0;
1139 static int dollar_arguments_count;
1140 static int dollar_first_arg_num;
1141 static int dollar_max_arg_used;
1142 static int dollar_format_warned;
1143
1144 /* Initialize the checking for a format string that may contain $
1145 parameter number specifications; we will need to keep track of whether
1146 each parameter has been used. FIRST_ARG_NUM is the number of the first
1147 argument that is a parameter to the format, or 0 for a vprintf-style
1148 function; PARAMS is the list of arguments starting at this argument. */
1149
1150 static void
init_dollar_format_checking(int first_arg_num,tree params)1151 init_dollar_format_checking (int first_arg_num, tree params)
1152 {
1153 tree oparams = params;
1154
1155 dollar_first_arg_num = first_arg_num;
1156 dollar_arguments_count = 0;
1157 dollar_max_arg_used = 0;
1158 dollar_format_warned = 0;
1159 if (first_arg_num > 0)
1160 {
1161 while (params)
1162 {
1163 dollar_arguments_count++;
1164 params = TREE_CHAIN (params);
1165 }
1166 }
1167 if (dollar_arguments_alloc < dollar_arguments_count)
1168 {
1169 free (dollar_arguments_used);
1170 free (dollar_arguments_pointer_p);
1171 dollar_arguments_alloc = dollar_arguments_count;
1172 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
1173 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
1174 }
1175 if (dollar_arguments_alloc)
1176 {
1177 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1178 if (first_arg_num > 0)
1179 {
1180 int i = 0;
1181 params = oparams;
1182 while (params)
1183 {
1184 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1185 == POINTER_TYPE);
1186 params = TREE_CHAIN (params);
1187 i++;
1188 }
1189 }
1190 }
1191 }
1192
1193
1194 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1195 is set, it is an error if one is not found; otherwise, it is OK. If
1196 such a number is found, check whether it is within range and mark that
1197 numbered operand as being used for later checking. Returns the operand
1198 number if found and within range, zero if no such number was found and
1199 this is OK, or -1 on error. PARAMS points to the first operand of the
1200 format; PARAM_PTR is made to point to the parameter referred to. If
1201 a $ format is found, *FORMAT is updated to point just after it. */
1202
1203 static int
maybe_read_dollar_number(const char ** format,int dollar_needed,tree params,tree * param_ptr,const format_kind_info * fki)1204 maybe_read_dollar_number (const char **format,
1205 int dollar_needed, tree params, tree *param_ptr,
1206 const format_kind_info *fki)
1207 {
1208 int argnum;
1209 int overflow_flag;
1210 const char *fcp = *format;
1211 if (!ISDIGIT (*fcp))
1212 {
1213 if (dollar_needed)
1214 {
1215 warning (OPT_Wformat_, "missing $ operand number in format");
1216 return -1;
1217 }
1218 else
1219 return 0;
1220 }
1221 argnum = 0;
1222 overflow_flag = 0;
1223 while (ISDIGIT (*fcp))
1224 {
1225 int nargnum;
1226 nargnum = 10 * argnum + (*fcp - '0');
1227 if (nargnum < 0 || nargnum / 10 != argnum)
1228 overflow_flag = 1;
1229 argnum = nargnum;
1230 fcp++;
1231 }
1232 if (*fcp != '$')
1233 {
1234 if (dollar_needed)
1235 {
1236 warning (OPT_Wformat_, "missing $ operand number in format");
1237 return -1;
1238 }
1239 else
1240 return 0;
1241 }
1242 *format = fcp + 1;
1243 if (pedantic && !dollar_format_warned)
1244 {
1245 warning (OPT_Wformat_, "%s does not support %%n$ operand number formats",
1246 C_STD_NAME (STD_EXT));
1247 dollar_format_warned = 1;
1248 }
1249 if (overflow_flag || argnum == 0
1250 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1251 {
1252 warning (OPT_Wformat_, "operand number out of range in format");
1253 return -1;
1254 }
1255 if (argnum > dollar_max_arg_used)
1256 dollar_max_arg_used = argnum;
1257 /* For vprintf-style functions we may need to allocate more memory to
1258 track which arguments are used. */
1259 while (dollar_arguments_alloc < dollar_max_arg_used)
1260 {
1261 int nalloc;
1262 nalloc = 2 * dollar_arguments_alloc + 16;
1263 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1264 nalloc);
1265 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1266 nalloc);
1267 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1268 nalloc - dollar_arguments_alloc);
1269 dollar_arguments_alloc = nalloc;
1270 }
1271 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1272 && dollar_arguments_used[argnum - 1] == 1)
1273 {
1274 dollar_arguments_used[argnum - 1] = 2;
1275 warning (OPT_Wformat_, "format argument %d used more than once in %s format",
1276 argnum, fki->name);
1277 }
1278 else
1279 dollar_arguments_used[argnum - 1] = 1;
1280 if (dollar_first_arg_num)
1281 {
1282 int i;
1283 *param_ptr = params;
1284 for (i = 1; i < argnum && *param_ptr != 0; i++)
1285 *param_ptr = TREE_CHAIN (*param_ptr);
1286
1287 /* This case shouldn't be caught here. */
1288 gcc_assert (*param_ptr);
1289 }
1290 else
1291 *param_ptr = 0;
1292 return argnum;
1293 }
1294
1295 /* Ensure that FORMAT does not start with a decimal number followed by
1296 a $; give a diagnostic and return true if it does, false otherwise. */
1297
1298 static bool
avoid_dollar_number(const char * format)1299 avoid_dollar_number (const char *format)
1300 {
1301 if (!ISDIGIT (*format))
1302 return false;
1303 while (ISDIGIT (*format))
1304 format++;
1305 if (*format == '$')
1306 {
1307 warning (OPT_Wformat_, "$ operand number used after format without operand number");
1308 return true;
1309 }
1310 return false;
1311 }
1312
1313
1314 /* Finish the checking for a format string that used $ operand number formats
1315 instead of non-$ formats. We check for unused operands before used ones
1316 (a serious error, since the implementation of the format function
1317 can't know what types to pass to va_arg to find the later arguments).
1318 and for unused operands at the end of the format (if we know how many
1319 arguments the format had, so not for vprintf). If there were operand
1320 numbers out of range on a non-vprintf-style format, we won't have reached
1321 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1322 pointers. */
1323
1324 static void
finish_dollar_format_checking(format_check_results * res,int pointer_gap_ok)1325 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1326 {
1327 int i;
1328 bool found_pointer_gap = false;
1329 for (i = 0; i < dollar_max_arg_used; i++)
1330 {
1331 if (!dollar_arguments_used[i])
1332 {
1333 if (pointer_gap_ok && (dollar_first_arg_num == 0
1334 || dollar_arguments_pointer_p[i]))
1335 found_pointer_gap = true;
1336 else
1337 warning_at (res->format_string_loc, OPT_Wformat_,
1338 "format argument %d unused before used argument %d in $-style format",
1339 i + 1, dollar_max_arg_used);
1340 }
1341 }
1342 if (found_pointer_gap
1343 || (dollar_first_arg_num
1344 && dollar_max_arg_used < dollar_arguments_count))
1345 {
1346 res->number_other--;
1347 res->number_dollar_extra_args++;
1348 }
1349 }
1350
1351
1352 /* Retrieve the specification for a format flag. SPEC contains the
1353 specifications for format flags for the applicable kind of format.
1354 FLAG is the flag in question. If PREDICATES is NULL, the basic
1355 spec for that flag must be retrieved and must exist. If
1356 PREDICATES is not NULL, it is a string listing possible predicates
1357 for the spec entry; if an entry predicated on any of these is
1358 found, it is returned, otherwise NULL is returned. */
1359
1360 static const format_flag_spec *
get_flag_spec(const format_flag_spec * spec,int flag,const char * predicates)1361 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1362 {
1363 int i;
1364 for (i = 0; spec[i].flag_char != 0; i++)
1365 {
1366 if (spec[i].flag_char != flag)
1367 continue;
1368 if (predicates != NULL)
1369 {
1370 if (spec[i].predicate != 0
1371 && strchr (predicates, spec[i].predicate) != 0)
1372 return &spec[i];
1373 }
1374 else if (spec[i].predicate == 0)
1375 return &spec[i];
1376 }
1377 gcc_assert (predicates);
1378 return NULL;
1379 }
1380
1381
1382 /* Check the argument list of a call to printf, scanf, etc.
1383 INFO points to the function_format_info structure.
1384 PARAMS is the list of argument values. */
1385
1386 static void
check_format_info(function_format_info * info,tree params)1387 check_format_info (function_format_info *info, tree params)
1388 {
1389 format_check_context format_ctx;
1390 unsigned HOST_WIDE_INT arg_num;
1391 tree format_tree;
1392 format_check_results res;
1393 /* Skip to format argument. If the argument isn't available, there's
1394 no work for us to do; prototype checking will catch the problem. */
1395 for (arg_num = 1; ; ++arg_num)
1396 {
1397 if (params == 0)
1398 return;
1399 if (arg_num == info->format_num)
1400 break;
1401 params = TREE_CHAIN (params);
1402 }
1403 format_tree = TREE_VALUE (params);
1404 params = TREE_CHAIN (params);
1405 if (format_tree == 0)
1406 return;
1407
1408 res.number_non_literal = 0;
1409 res.number_extra_args = 0;
1410 res.extra_arg_loc = UNKNOWN_LOCATION;
1411 res.number_dollar_extra_args = 0;
1412 res.number_wide = 0;
1413 res.number_empty = 0;
1414 res.number_unterminated = 0;
1415 res.number_other = 0;
1416 res.format_string_loc = input_location;
1417
1418 format_ctx.res = &res;
1419 format_ctx.info = info;
1420 format_ctx.params = params;
1421
1422 check_function_arguments_recurse (check_format_arg, &format_ctx,
1423 format_tree, arg_num);
1424
1425 location_t loc = format_ctx.res->format_string_loc;
1426
1427 if (res.number_non_literal > 0)
1428 {
1429 /* Functions taking a va_list normally pass a non-literal format
1430 string. These functions typically are declared with
1431 first_arg_num == 0, so avoid warning in those cases. */
1432 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1433 {
1434 /* For strftime-like formats, warn for not checking the format
1435 string; but there are no arguments to check. */
1436 warning_at (loc, OPT_Wformat_nonliteral,
1437 "format not a string literal, format string not checked");
1438 }
1439 else if (info->first_arg_num != 0)
1440 {
1441 /* If there are no arguments for the format at all, we may have
1442 printf (foo) which is likely to be a security hole. */
1443 while (arg_num + 1 < info->first_arg_num)
1444 {
1445 if (params == 0)
1446 break;
1447 params = TREE_CHAIN (params);
1448 ++arg_num;
1449 }
1450 if (params == 0 && warn_format_security)
1451 warning_at (loc, OPT_Wformat_security,
1452 "format not a string literal and no format arguments");
1453 else if (params == 0 && warn_format_nonliteral)
1454 warning_at (loc, OPT_Wformat_nonliteral,
1455 "format not a string literal and no format arguments");
1456 else
1457 warning_at (loc, OPT_Wformat_nonliteral,
1458 "format not a string literal, argument types not checked");
1459 }
1460 }
1461
1462 /* If there were extra arguments to the format, normally warn. However,
1463 the standard does say extra arguments are ignored, so in the specific
1464 case where we have multiple leaves (conditional expressions or
1465 ngettext) allow extra arguments if at least one leaf didn't have extra
1466 arguments, but was otherwise OK (either non-literal or checked OK).
1467 If the format is an empty string, this should be counted similarly to the
1468 case of extra format arguments. */
1469 if (res.number_extra_args > 0 && res.number_non_literal == 0
1470 && res.number_other == 0)
1471 {
1472 if (res.extra_arg_loc == UNKNOWN_LOCATION)
1473 res.extra_arg_loc = loc;
1474 warning_at (res.extra_arg_loc, OPT_Wformat_extra_args,
1475 "too many arguments for format");
1476 }
1477 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1478 && res.number_other == 0)
1479 warning_at (loc, OPT_Wformat_extra_args, "unused arguments in $-style format");
1480 if (res.number_empty > 0 && res.number_non_literal == 0
1481 && res.number_other == 0)
1482 warning_at (loc, OPT_Wformat_zero_length, "zero-length %s format string",
1483 format_types[info->format_type].name);
1484
1485 if (res.number_wide > 0)
1486 warning_at (loc, OPT_Wformat_, "format is a wide character string");
1487
1488 if (res.number_unterminated > 0)
1489 warning_at (loc, OPT_Wformat_, "unterminated format string");
1490 }
1491
1492 /* Callback from check_function_arguments_recurse to check a
1493 format string. FORMAT_TREE is the format parameter. ARG_NUM
1494 is the number of the format argument. CTX points to a
1495 format_check_context. */
1496
1497 static void
check_format_arg(void * ctx,tree format_tree,unsigned HOST_WIDE_INT arg_num)1498 check_format_arg (void *ctx, tree format_tree,
1499 unsigned HOST_WIDE_INT arg_num)
1500 {
1501 format_check_context *format_ctx = (format_check_context *) ctx;
1502 format_check_results *res = format_ctx->res;
1503 function_format_info *info = format_ctx->info;
1504 tree params = format_ctx->params;
1505
1506 int format_length;
1507 HOST_WIDE_INT offset;
1508 const char *format_chars;
1509 tree array_size = 0;
1510 tree array_init;
1511
1512 if (VAR_P (format_tree))
1513 {
1514 /* Pull out a constant value if the front end didn't. */
1515 format_tree = decl_constant_value (format_tree);
1516 STRIP_NOPS (format_tree);
1517 }
1518
1519 if (integer_zerop (format_tree))
1520 {
1521 /* Skip to first argument to check, so we can see if this format
1522 has any arguments (it shouldn't). */
1523 while (arg_num + 1 < info->first_arg_num)
1524 {
1525 if (params == 0)
1526 return;
1527 params = TREE_CHAIN (params);
1528 ++arg_num;
1529 }
1530
1531 if (params == 0)
1532 res->number_other++;
1533 else
1534 {
1535 if (res->number_extra_args == 0)
1536 res->extra_arg_loc = EXPR_LOC_OR_LOC (TREE_VALUE (params),
1537 input_location);
1538 res->number_extra_args++;
1539 }
1540 return;
1541 }
1542
1543 offset = 0;
1544 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1545 {
1546 tree arg0, arg1;
1547
1548 arg0 = TREE_OPERAND (format_tree, 0);
1549 arg1 = TREE_OPERAND (format_tree, 1);
1550 STRIP_NOPS (arg0);
1551 STRIP_NOPS (arg1);
1552 if (TREE_CODE (arg1) == INTEGER_CST)
1553 format_tree = arg0;
1554 else
1555 {
1556 res->number_non_literal++;
1557 return;
1558 }
1559 /* POINTER_PLUS_EXPR offsets are to be interpreted signed. */
1560 if (!cst_and_fits_in_hwi (arg1))
1561 {
1562 res->number_non_literal++;
1563 return;
1564 }
1565 offset = int_cst_value (arg1);
1566 }
1567 if (TREE_CODE (format_tree) != ADDR_EXPR)
1568 {
1569 res->number_non_literal++;
1570 return;
1571 }
1572 res->format_string_loc = EXPR_LOC_OR_LOC (format_tree, input_location);
1573 format_tree = TREE_OPERAND (format_tree, 0);
1574 if (format_types[info->format_type].flags
1575 & (int) FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL)
1576 {
1577 bool objc_str = (info->format_type == gcc_objc_string_format_type);
1578 /* We cannot examine this string here - but we can check that it is
1579 a valid type. */
1580 if (TREE_CODE (format_tree) != CONST_DECL
1581 || !((objc_str && objc_string_ref_type_p (TREE_TYPE (format_tree)))
1582 || (*targetcm.string_object_ref_type_p)
1583 ((const_tree) TREE_TYPE (format_tree))))
1584 {
1585 res->number_non_literal++;
1586 return;
1587 }
1588 /* Skip to first argument to check. */
1589 while (arg_num + 1 < info->first_arg_num)
1590 {
1591 if (params == 0)
1592 return;
1593 params = TREE_CHAIN (params);
1594 ++arg_num;
1595 }
1596 /* So, we have a valid literal string object and one or more params.
1597 We need to use an external helper to parse the string into format
1598 info. For Objective-C variants we provide the resource within the
1599 objc tree, for target variants, via a hook. */
1600 if (objc_str)
1601 objc_check_format_arg (format_tree, params);
1602 else if (targetcm.check_string_object_format_arg)
1603 (*targetcm.check_string_object_format_arg) (format_tree, params);
1604 /* Else we can't handle it and retire quietly. */
1605 return;
1606 }
1607 if (TREE_CODE (format_tree) == ARRAY_REF
1608 && tree_fits_shwi_p (TREE_OPERAND (format_tree, 1))
1609 && (offset += tree_to_shwi (TREE_OPERAND (format_tree, 1))) >= 0)
1610 format_tree = TREE_OPERAND (format_tree, 0);
1611 if (offset < 0)
1612 {
1613 res->number_non_literal++;
1614 return;
1615 }
1616 if (VAR_P (format_tree)
1617 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1618 && (array_init = decl_constant_value (format_tree)) != format_tree
1619 && TREE_CODE (array_init) == STRING_CST)
1620 {
1621 /* Extract the string constant initializer. Note that this may include
1622 a trailing NUL character that is not in the array (e.g.
1623 const char a[3] = "foo";). */
1624 array_size = DECL_SIZE_UNIT (format_tree);
1625 format_tree = array_init;
1626 }
1627 if (TREE_CODE (format_tree) != STRING_CST)
1628 {
1629 res->number_non_literal++;
1630 return;
1631 }
1632 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1633 {
1634 res->number_wide++;
1635 return;
1636 }
1637 format_chars = TREE_STRING_POINTER (format_tree);
1638 format_length = TREE_STRING_LENGTH (format_tree);
1639 if (array_size != 0)
1640 {
1641 /* Variable length arrays can't be initialized. */
1642 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1643
1644 if (tree_fits_shwi_p (array_size))
1645 {
1646 HOST_WIDE_INT array_size_value = tree_to_shwi (array_size);
1647 if (array_size_value > 0
1648 && array_size_value == (int) array_size_value
1649 && format_length > array_size_value)
1650 format_length = array_size_value;
1651 }
1652 }
1653 if (offset)
1654 {
1655 if (offset >= format_length)
1656 {
1657 res->number_non_literal++;
1658 return;
1659 }
1660 format_chars += offset;
1661 format_length -= offset;
1662 }
1663 if (format_length < 1 || format_chars[--format_length] != 0)
1664 {
1665 res->number_unterminated++;
1666 return;
1667 }
1668 if (format_length == 0)
1669 {
1670 res->number_empty++;
1671 return;
1672 }
1673
1674 /* Skip to first argument to check. */
1675 while (arg_num + 1 < info->first_arg_num)
1676 {
1677 if (params == 0)
1678 return;
1679 params = TREE_CHAIN (params);
1680 ++arg_num;
1681 }
1682 /* Provisionally increment res->number_other; check_format_info_main
1683 will decrement it if it finds there are extra arguments, but this way
1684 need not adjust it for every return. */
1685 res->number_other++;
1686 object_allocator <format_wanted_type> fwt_pool ("format_wanted_type pool");
1687 check_format_info_main (res, info, format_chars, format_length,
1688 params, arg_num, fwt_pool);
1689 }
1690
1691
1692 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1693 is the NUL-terminated format string (which at this point may contain
1694 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1695 terminating NUL character). ARG_NUM is one less than the number of
1696 the first format argument to check; PARAMS points to that format
1697 argument in the list of arguments. */
1698
1699 static void
check_format_info_main(format_check_results * res,function_format_info * info,const char * format_chars,int format_length,tree params,unsigned HOST_WIDE_INT arg_num,object_allocator<format_wanted_type> & fwt_pool)1700 check_format_info_main (format_check_results *res,
1701 function_format_info *info, const char *format_chars,
1702 int format_length, tree params,
1703 unsigned HOST_WIDE_INT arg_num,
1704 object_allocator <format_wanted_type> &fwt_pool)
1705 {
1706 const char *orig_format_chars = format_chars;
1707 tree first_fillin_param = params;
1708
1709 const format_kind_info *fki = &format_types[info->format_type];
1710 const format_flag_spec *flag_specs = fki->flag_specs;
1711 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1712 location_t format_string_loc = res->format_string_loc;
1713
1714 /* -1 if no conversions taking an operand have been found; 0 if one has
1715 and it didn't use $; 1 if $ formats are in use. */
1716 int has_operand_number = -1;
1717
1718 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1719
1720 while (*format_chars != 0)
1721 {
1722 int i;
1723 int suppressed = FALSE;
1724 const char *length_chars = NULL;
1725 enum format_lengths length_chars_val = FMT_LEN_none;
1726 enum format_std_version length_chars_std = STD_C89;
1727 int format_char;
1728 tree cur_param;
1729 tree wanted_type;
1730 int main_arg_num = 0;
1731 tree main_arg_params = 0;
1732 enum format_std_version wanted_type_std;
1733 const char *wanted_type_name;
1734 format_wanted_type width_wanted_type;
1735 format_wanted_type precision_wanted_type;
1736 format_wanted_type main_wanted_type;
1737 format_wanted_type *first_wanted_type = NULL;
1738 format_wanted_type *last_wanted_type = NULL;
1739 const format_length_info *fli = NULL;
1740 const format_char_info *fci = NULL;
1741 char flag_chars[256];
1742 int alloc_flag = 0;
1743 int scalar_identity_flag = 0;
1744 const char *format_start;
1745
1746 if (*format_chars++ != '%')
1747 continue;
1748 if (*format_chars == 0)
1749 {
1750 warning_at (location_from_offset (format_string_loc,
1751 format_chars - orig_format_chars),
1752 OPT_Wformat_,
1753 "spurious trailing %<%%%> in format");
1754 continue;
1755 }
1756 if (*format_chars == '%')
1757 {
1758 ++format_chars;
1759 continue;
1760 }
1761 flag_chars[0] = 0;
1762
1763 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1764 {
1765 /* Possibly read a $ operand number at the start of the format.
1766 If one was previously used, one is required here. If one
1767 is not used here, we can't immediately conclude this is a
1768 format without them, since it could be printf %m or scanf %*. */
1769 int opnum;
1770 opnum = maybe_read_dollar_number (&format_chars, 0,
1771 first_fillin_param,
1772 &main_arg_params, fki);
1773 if (opnum == -1)
1774 return;
1775 else if (opnum > 0)
1776 {
1777 has_operand_number = 1;
1778 main_arg_num = opnum + info->first_arg_num - 1;
1779 }
1780 }
1781 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1782 {
1783 if (avoid_dollar_number (format_chars))
1784 return;
1785 }
1786
1787 /* Read any format flags, but do not yet validate them beyond removing
1788 duplicates, since in general validation depends on the rest of
1789 the format. */
1790 while (*format_chars != 0
1791 && strchr (fki->flag_chars, *format_chars) != 0)
1792 {
1793 const format_flag_spec *s = get_flag_spec (flag_specs,
1794 *format_chars, NULL);
1795 if (strchr (flag_chars, *format_chars) != 0)
1796 {
1797 warning_at (location_from_offset (format_string_loc,
1798 format_chars + 1
1799 - orig_format_chars),
1800 OPT_Wformat_,
1801 "repeated %s in format", _(s->name));
1802 }
1803 else
1804 {
1805 i = strlen (flag_chars);
1806 flag_chars[i++] = *format_chars;
1807 flag_chars[i] = 0;
1808 }
1809 if (s->skip_next_char)
1810 {
1811 ++format_chars;
1812 if (*format_chars == 0)
1813 {
1814 warning_at (format_string_loc, OPT_Wformat_,
1815 "missing fill character at end of strfmon format");
1816 return;
1817 }
1818 }
1819 ++format_chars;
1820 }
1821
1822 /* Read any format width, possibly * or *m$. */
1823 if (fki->width_char != 0)
1824 {
1825 if (fki->width_type != NULL && *format_chars == '*')
1826 {
1827 i = strlen (flag_chars);
1828 flag_chars[i++] = fki->width_char;
1829 flag_chars[i] = 0;
1830 /* "...a field width...may be indicated by an asterisk.
1831 In this case, an int argument supplies the field width..." */
1832 ++format_chars;
1833 if (has_operand_number != 0)
1834 {
1835 int opnum;
1836 opnum = maybe_read_dollar_number (&format_chars,
1837 has_operand_number == 1,
1838 first_fillin_param,
1839 ¶ms, fki);
1840 if (opnum == -1)
1841 return;
1842 else if (opnum > 0)
1843 {
1844 has_operand_number = 1;
1845 arg_num = opnum + info->first_arg_num - 1;
1846 }
1847 else
1848 has_operand_number = 0;
1849 }
1850 else
1851 {
1852 if (avoid_dollar_number (format_chars))
1853 return;
1854 }
1855 if (info->first_arg_num != 0)
1856 {
1857 if (params == 0)
1858 cur_param = NULL;
1859 else
1860 {
1861 cur_param = TREE_VALUE (params);
1862 if (has_operand_number <= 0)
1863 {
1864 params = TREE_CHAIN (params);
1865 ++arg_num;
1866 }
1867 }
1868 width_wanted_type.wanted_type = *fki->width_type;
1869 width_wanted_type.wanted_type_name = NULL;
1870 width_wanted_type.pointer_count = 0;
1871 width_wanted_type.char_lenient_flag = 0;
1872 width_wanted_type.scalar_identity_flag = 0;
1873 width_wanted_type.writing_in_flag = 0;
1874 width_wanted_type.reading_from_flag = 0;
1875 width_wanted_type.kind = CF_KIND_FIELD_WIDTH;
1876 width_wanted_type.format_start = format_chars - 1;
1877 width_wanted_type.format_length = 1;
1878 width_wanted_type.param = cur_param;
1879 width_wanted_type.arg_num = arg_num;
1880 width_wanted_type.offset_loc =
1881 format_chars - orig_format_chars;
1882 width_wanted_type.next = NULL;
1883 if (last_wanted_type != 0)
1884 last_wanted_type->next = &width_wanted_type;
1885 if (first_wanted_type == 0)
1886 first_wanted_type = &width_wanted_type;
1887 last_wanted_type = &width_wanted_type;
1888 }
1889 }
1890 else
1891 {
1892 /* Possibly read a numeric width. If the width is zero,
1893 we complain if appropriate. */
1894 int non_zero_width_char = FALSE;
1895 int found_width = FALSE;
1896 while (ISDIGIT (*format_chars))
1897 {
1898 found_width = TRUE;
1899 if (*format_chars != '0')
1900 non_zero_width_char = TRUE;
1901 ++format_chars;
1902 }
1903 if (found_width && !non_zero_width_char &&
1904 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1905 warning_at (format_string_loc, OPT_Wformat_,
1906 "zero width in %s format", fki->name);
1907 if (found_width)
1908 {
1909 i = strlen (flag_chars);
1910 flag_chars[i++] = fki->width_char;
1911 flag_chars[i] = 0;
1912 }
1913 }
1914 }
1915
1916 /* Read any format left precision (must be a number, not *). */
1917 if (fki->left_precision_char != 0 && *format_chars == '#')
1918 {
1919 ++format_chars;
1920 i = strlen (flag_chars);
1921 flag_chars[i++] = fki->left_precision_char;
1922 flag_chars[i] = 0;
1923 if (!ISDIGIT (*format_chars))
1924 warning_at (location_from_offset (format_string_loc,
1925 format_chars - orig_format_chars),
1926 OPT_Wformat_,
1927 "empty left precision in %s format", fki->name);
1928 while (ISDIGIT (*format_chars))
1929 ++format_chars;
1930 }
1931
1932 /* Read any format precision, possibly * or *m$. */
1933 if (fki->precision_char != 0 && *format_chars == '.')
1934 {
1935 ++format_chars;
1936 i = strlen (flag_chars);
1937 flag_chars[i++] = fki->precision_char;
1938 flag_chars[i] = 0;
1939 if (fki->precision_type != NULL && *format_chars == '*')
1940 {
1941 /* "...a...precision...may be indicated by an asterisk.
1942 In this case, an int argument supplies the...precision." */
1943 ++format_chars;
1944 if (has_operand_number != 0)
1945 {
1946 int opnum;
1947 opnum = maybe_read_dollar_number (&format_chars,
1948 has_operand_number == 1,
1949 first_fillin_param,
1950 ¶ms, fki);
1951 if (opnum == -1)
1952 return;
1953 else if (opnum > 0)
1954 {
1955 has_operand_number = 1;
1956 arg_num = opnum + info->first_arg_num - 1;
1957 }
1958 else
1959 has_operand_number = 0;
1960 }
1961 else
1962 {
1963 if (avoid_dollar_number (format_chars))
1964 return;
1965 }
1966 if (info->first_arg_num != 0)
1967 {
1968 if (params == 0)
1969 cur_param = NULL;
1970 else
1971 {
1972 cur_param = TREE_VALUE (params);
1973 if (has_operand_number <= 0)
1974 {
1975 params = TREE_CHAIN (params);
1976 ++arg_num;
1977 }
1978 }
1979 precision_wanted_type.wanted_type = *fki->precision_type;
1980 precision_wanted_type.wanted_type_name = NULL;
1981 precision_wanted_type.pointer_count = 0;
1982 precision_wanted_type.char_lenient_flag = 0;
1983 precision_wanted_type.scalar_identity_flag = 0;
1984 precision_wanted_type.writing_in_flag = 0;
1985 precision_wanted_type.reading_from_flag = 0;
1986 precision_wanted_type.kind = CF_KIND_FIELD_PRECISION;
1987 precision_wanted_type.param = cur_param;
1988 precision_wanted_type.format_start = format_chars - 2;
1989 precision_wanted_type.format_length = 2;
1990 precision_wanted_type.arg_num = arg_num;
1991 precision_wanted_type.offset_loc =
1992 format_chars - orig_format_chars;
1993 precision_wanted_type.next = NULL;
1994 if (last_wanted_type != 0)
1995 last_wanted_type->next = &precision_wanted_type;
1996 if (first_wanted_type == 0)
1997 first_wanted_type = &precision_wanted_type;
1998 last_wanted_type = &precision_wanted_type;
1999 }
2000 }
2001 else
2002 {
2003 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
2004 && !ISDIGIT (*format_chars))
2005 warning_at (location_from_offset (format_string_loc,
2006 format_chars - orig_format_chars),
2007 OPT_Wformat_,
2008 "empty precision in %s format", fki->name);
2009 while (ISDIGIT (*format_chars))
2010 ++format_chars;
2011 }
2012 }
2013
2014 format_start = format_chars;
2015 if (fki->alloc_char && fki->alloc_char == *format_chars)
2016 {
2017 i = strlen (flag_chars);
2018 flag_chars[i++] = fki->alloc_char;
2019 flag_chars[i] = 0;
2020 format_chars++;
2021 }
2022
2023 /* Handle the scanf allocation kludge. */
2024 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
2025 {
2026 if (*format_chars == 'a' && !flag_isoc99)
2027 {
2028 if (format_chars[1] == 's' || format_chars[1] == 'S'
2029 || format_chars[1] == '[')
2030 {
2031 /* 'a' is used as a flag. */
2032 i = strlen (flag_chars);
2033 flag_chars[i++] = 'a';
2034 flag_chars[i] = 0;
2035 format_chars++;
2036 }
2037 }
2038 }
2039
2040 /* Read any length modifier, if this kind of format has them. */
2041 fli = fki->length_char_specs;
2042 length_chars = NULL;
2043 length_chars_val = FMT_LEN_none;
2044 length_chars_std = STD_C89;
2045 scalar_identity_flag = 0;
2046 if (fli)
2047 {
2048 while (fli->name != 0
2049 && strncmp (fli->name, format_chars, strlen (fli->name)))
2050 fli++;
2051 if (fli->name != 0)
2052 {
2053 format_chars += strlen (fli->name);
2054 if (fli->double_name != 0 && fli->name[0] == *format_chars)
2055 {
2056 format_chars++;
2057 length_chars = fli->double_name;
2058 length_chars_val = fli->double_index;
2059 length_chars_std = fli->double_std;
2060 }
2061 else
2062 {
2063 length_chars = fli->name;
2064 length_chars_val = fli->index;
2065 length_chars_std = fli->std;
2066 scalar_identity_flag = fli->scalar_identity_flag;
2067 }
2068 i = strlen (flag_chars);
2069 flag_chars[i++] = fki->length_code_char;
2070 flag_chars[i] = 0;
2071 }
2072 if (pedantic)
2073 {
2074 /* Warn if the length modifier is non-standard. */
2075 if (ADJ_STD (length_chars_std) > C_STD_VER)
2076 warning_at (format_string_loc, OPT_Wformat_,
2077 "%s does not support the %qs %s length modifier",
2078 C_STD_NAME (length_chars_std), length_chars,
2079 fki->name);
2080 }
2081 }
2082
2083 /* Read any modifier (strftime E/O). */
2084 if (fki->modifier_chars != NULL)
2085 {
2086 while (*format_chars != 0
2087 && strchr (fki->modifier_chars, *format_chars) != 0)
2088 {
2089 if (strchr (flag_chars, *format_chars) != 0)
2090 {
2091 const format_flag_spec *s = get_flag_spec (flag_specs,
2092 *format_chars, NULL);
2093 warning_at (location_from_offset (format_string_loc,
2094 format_chars
2095 - orig_format_chars),
2096 OPT_Wformat_,
2097 "repeated %s in format", _(s->name));
2098 }
2099 else
2100 {
2101 i = strlen (flag_chars);
2102 flag_chars[i++] = *format_chars;
2103 flag_chars[i] = 0;
2104 }
2105 ++format_chars;
2106 }
2107 }
2108
2109 format_char = *format_chars;
2110 if (format_char == 0
2111 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
2112 && format_char == '%'))
2113 {
2114 warning_at (location_from_offset (format_string_loc,
2115 format_chars - orig_format_chars),
2116 OPT_Wformat_,
2117 "conversion lacks type at end of format");
2118 continue;
2119 }
2120 format_chars++;
2121 fci = fki->conversion_specs;
2122 while (fci->format_chars != 0
2123 && strchr (fci->format_chars, format_char) == 0)
2124 ++fci;
2125 if (fci->format_chars == 0)
2126 {
2127 if (ISGRAPH (format_char))
2128 warning_at (location_from_offset (format_string_loc,
2129 format_chars - orig_format_chars),
2130 OPT_Wformat_,
2131 "unknown conversion type character %qc in format",
2132 format_char);
2133 else
2134 warning_at (location_from_offset (format_string_loc,
2135 format_chars - orig_format_chars),
2136 OPT_Wformat_,
2137 "unknown conversion type character 0x%x in format",
2138 format_char);
2139 continue;
2140 }
2141 if (pedantic)
2142 {
2143 if (ADJ_STD (fci->std) > C_STD_VER)
2144 warning_at (location_from_offset (format_string_loc,
2145 format_chars - orig_format_chars),
2146 OPT_Wformat_,
2147 "%s does not support the %<%%%c%> %s format",
2148 C_STD_NAME (fci->std), format_char, fki->name);
2149 }
2150
2151 /* Validate the individual flags used, removing any that are invalid. */
2152 {
2153 int d = 0;
2154 for (i = 0; flag_chars[i] != 0; i++)
2155 {
2156 const format_flag_spec *s = get_flag_spec (flag_specs,
2157 flag_chars[i], NULL);
2158 flag_chars[i - d] = flag_chars[i];
2159 if (flag_chars[i] == fki->length_code_char)
2160 continue;
2161 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
2162 {
2163 warning_at (location_from_offset (format_string_loc,
2164 format_chars
2165 - orig_format_chars),
2166 OPT_Wformat_, "%s used with %<%%%c%> %s format",
2167 _(s->name), format_char, fki->name);
2168 d++;
2169 continue;
2170 }
2171 if (pedantic)
2172 {
2173 const format_flag_spec *t;
2174 if (ADJ_STD (s->std) > C_STD_VER)
2175 warning_at (format_string_loc, OPT_Wformat_,
2176 "%s does not support %s",
2177 C_STD_NAME (s->std), _(s->long_name));
2178 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
2179 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
2180 {
2181 const char *long_name = (t->long_name != NULL
2182 ? t->long_name
2183 : s->long_name);
2184 if (ADJ_STD (t->std) > C_STD_VER)
2185 warning_at (format_string_loc, OPT_Wformat_,
2186 "%s does not support %s with the %<%%%c%> %s format",
2187 C_STD_NAME (t->std), _(long_name),
2188 format_char, fki->name);
2189 }
2190 }
2191 }
2192 flag_chars[i - d] = 0;
2193 }
2194
2195 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
2196 && strchr (flag_chars, 'a') != 0)
2197 alloc_flag = 1;
2198 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0)
2199 alloc_flag = 1;
2200
2201 if (fki->suppression_char
2202 && strchr (flag_chars, fki->suppression_char) != 0)
2203 suppressed = 1;
2204
2205 /* Validate the pairs of flags used. */
2206 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
2207 {
2208 const format_flag_spec *s, *t;
2209 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
2210 continue;
2211 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
2212 continue;
2213 if (bad_flag_pairs[i].predicate != 0
2214 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
2215 continue;
2216 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
2217 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
2218 if (bad_flag_pairs[i].ignored)
2219 {
2220 if (bad_flag_pairs[i].predicate != 0)
2221 warning_at (format_string_loc, OPT_Wformat_,
2222 "%s ignored with %s and %<%%%c%> %s format",
2223 _(s->name), _(t->name), format_char,
2224 fki->name);
2225 else
2226 warning_at (format_string_loc, OPT_Wformat_,
2227 "%s ignored with %s in %s format",
2228 _(s->name), _(t->name), fki->name);
2229 }
2230 else
2231 {
2232 if (bad_flag_pairs[i].predicate != 0)
2233 warning_at (format_string_loc, OPT_Wformat_,
2234 "use of %s and %s together with %<%%%c%> %s format",
2235 _(s->name), _(t->name), format_char,
2236 fki->name);
2237 else
2238 warning_at (format_string_loc, OPT_Wformat_,
2239 "use of %s and %s together in %s format",
2240 _(s->name), _(t->name), fki->name);
2241 }
2242 }
2243
2244 /* Give Y2K warnings. */
2245 if (warn_format_y2k)
2246 {
2247 int y2k_level = 0;
2248 if (strchr (fci->flags2, '4') != 0)
2249 if (strchr (flag_chars, 'E') != 0)
2250 y2k_level = 3;
2251 else
2252 y2k_level = 2;
2253 else if (strchr (fci->flags2, '3') != 0)
2254 y2k_level = 3;
2255 else if (strchr (fci->flags2, '2') != 0)
2256 y2k_level = 2;
2257 if (y2k_level == 3)
2258 warning_at (format_string_loc, OPT_Wformat_y2k,
2259 "%<%%%c%> yields only last 2 digits of "
2260 "year in some locales", format_char);
2261 else if (y2k_level == 2)
2262 warning_at (format_string_loc, OPT_Wformat_y2k,
2263 "%<%%%c%> yields only last 2 digits of year",
2264 format_char);
2265 }
2266
2267 if (strchr (fci->flags2, '[') != 0)
2268 {
2269 /* Skip over scan set, in case it happens to have '%' in it. */
2270 if (*format_chars == '^')
2271 ++format_chars;
2272 /* Find closing bracket; if one is hit immediately, then
2273 it's part of the scan set rather than a terminator. */
2274 if (*format_chars == ']')
2275 ++format_chars;
2276 while (*format_chars && *format_chars != ']')
2277 ++format_chars;
2278 if (*format_chars != ']')
2279 /* The end of the format string was reached. */
2280 warning_at (location_from_offset (format_string_loc,
2281 format_chars - orig_format_chars),
2282 OPT_Wformat_,
2283 "no closing %<]%> for %<%%[%> format");
2284 }
2285
2286 wanted_type = 0;
2287 wanted_type_name = 0;
2288 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
2289 {
2290 wanted_type = (fci->types[length_chars_val].type
2291 ? *fci->types[length_chars_val].type : 0);
2292 wanted_type_name = fci->types[length_chars_val].name;
2293 wanted_type_std = fci->types[length_chars_val].std;
2294 if (wanted_type == 0)
2295 {
2296 warning_at (location_from_offset (format_string_loc,
2297 format_chars - orig_format_chars),
2298 OPT_Wformat_,
2299 "use of %qs length modifier with %qc type character"
2300 " has either no effect or undefined behavior",
2301 length_chars, format_char);
2302 /* Heuristic: skip one argument when an invalid length/type
2303 combination is encountered. */
2304 arg_num++;
2305 if (params != 0)
2306 params = TREE_CHAIN (params);
2307 continue;
2308 }
2309 else if (pedantic
2310 /* Warn if non-standard, provided it is more non-standard
2311 than the length and type characters that may already
2312 have been warned for. */
2313 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2314 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2315 {
2316 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2317 warning_at (location_from_offset (format_string_loc,
2318 format_chars - orig_format_chars),
2319 OPT_Wformat_,
2320 "%s does not support the %<%%%s%c%> %s format",
2321 C_STD_NAME (wanted_type_std), length_chars,
2322 format_char, fki->name);
2323 }
2324 }
2325
2326 main_wanted_type.next = NULL;
2327
2328 /* Finally. . .check type of argument against desired type! */
2329 if (info->first_arg_num == 0)
2330 continue;
2331 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2332 || suppressed)
2333 {
2334 if (main_arg_num != 0)
2335 {
2336 if (suppressed)
2337 warning_at (format_string_loc, OPT_Wformat_,
2338 "operand number specified with "
2339 "suppressed assignment");
2340 else
2341 warning_at (format_string_loc, OPT_Wformat_,
2342 "operand number specified for format "
2343 "taking no argument");
2344 }
2345 }
2346 else
2347 {
2348 format_wanted_type *wanted_type_ptr;
2349
2350 if (main_arg_num != 0)
2351 {
2352 arg_num = main_arg_num;
2353 params = main_arg_params;
2354 }
2355 else
2356 {
2357 ++arg_num;
2358 if (has_operand_number > 0)
2359 {
2360 warning_at (format_string_loc, OPT_Wformat_,
2361 "missing $ operand number in format");
2362 return;
2363 }
2364 else
2365 has_operand_number = 0;
2366 }
2367
2368 wanted_type_ptr = &main_wanted_type;
2369 while (fci)
2370 {
2371 if (params == 0)
2372 cur_param = NULL;
2373 else
2374 {
2375 cur_param = TREE_VALUE (params);
2376 params = TREE_CHAIN (params);
2377 }
2378
2379 wanted_type_ptr->wanted_type = wanted_type;
2380 wanted_type_ptr->wanted_type_name = wanted_type_name;
2381 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2382 wanted_type_ptr->char_lenient_flag = 0;
2383 if (strchr (fci->flags2, 'c') != 0)
2384 wanted_type_ptr->char_lenient_flag = 1;
2385 wanted_type_ptr->scalar_identity_flag = 0;
2386 if (scalar_identity_flag)
2387 wanted_type_ptr->scalar_identity_flag = 1;
2388 wanted_type_ptr->writing_in_flag = 0;
2389 wanted_type_ptr->reading_from_flag = 0;
2390 if (alloc_flag)
2391 wanted_type_ptr->writing_in_flag = 1;
2392 else
2393 {
2394 if (strchr (fci->flags2, 'W') != 0)
2395 wanted_type_ptr->writing_in_flag = 1;
2396 if (strchr (fci->flags2, 'R') != 0)
2397 wanted_type_ptr->reading_from_flag = 1;
2398 }
2399 wanted_type_ptr->kind = CF_KIND_FORMAT;
2400 wanted_type_ptr->param = cur_param;
2401 wanted_type_ptr->arg_num = arg_num;
2402 wanted_type_ptr->format_start = format_start;
2403 wanted_type_ptr->format_length = format_chars - format_start;
2404 wanted_type_ptr->offset_loc = format_chars - orig_format_chars;
2405 wanted_type_ptr->next = NULL;
2406 if (last_wanted_type != 0)
2407 last_wanted_type->next = wanted_type_ptr;
2408 if (first_wanted_type == 0)
2409 first_wanted_type = wanted_type_ptr;
2410 last_wanted_type = wanted_type_ptr;
2411
2412 fci = fci->chain;
2413 if (fci)
2414 {
2415 wanted_type_ptr = fwt_pool.allocate ();
2416 arg_num++;
2417 wanted_type = *fci->types[length_chars_val].type;
2418 wanted_type_name = fci->types[length_chars_val].name;
2419 }
2420 }
2421 }
2422
2423 if (first_wanted_type != 0)
2424 check_format_types (format_string_loc, first_wanted_type);
2425 }
2426
2427 if (format_chars - orig_format_chars != format_length)
2428 warning_at (location_from_offset (format_string_loc,
2429 format_chars + 1 - orig_format_chars),
2430 OPT_Wformat_contains_nul,
2431 "embedded %<\\0%> in format");
2432 if (info->first_arg_num != 0 && params != 0
2433 && has_operand_number <= 0)
2434 {
2435 res->number_other--;
2436 res->number_extra_args++;
2437 }
2438 if (has_operand_number > 0)
2439 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
2440 }
2441
2442
2443 /* Check the argument types from a single format conversion (possibly
2444 including width and precision arguments). LOC is the location of
2445 the format string. */
2446 static void
check_format_types(location_t loc,format_wanted_type * types)2447 check_format_types (location_t loc, format_wanted_type *types)
2448 {
2449 for (; types != 0; types = types->next)
2450 {
2451 tree cur_param;
2452 tree cur_type;
2453 tree orig_cur_type;
2454 tree wanted_type;
2455 int arg_num;
2456 int i;
2457 int char_type_flag;
2458
2459 wanted_type = types->wanted_type;
2460 arg_num = types->arg_num;
2461
2462 /* The following should not occur here. */
2463 gcc_assert (wanted_type);
2464 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2465
2466 if (types->pointer_count == 0)
2467 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2468
2469 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2470
2471 cur_param = types->param;
2472 if (!cur_param)
2473 {
2474 format_type_warning (loc, types, wanted_type, NULL);
2475 continue;
2476 }
2477
2478 cur_type = TREE_TYPE (cur_param);
2479 if (cur_type == error_mark_node)
2480 continue;
2481 orig_cur_type = cur_type;
2482 char_type_flag = 0;
2483
2484 STRIP_NOPS (cur_param);
2485
2486 /* Check the types of any additional pointer arguments
2487 that precede the "real" argument. */
2488 for (i = 0; i < types->pointer_count; ++i)
2489 {
2490 if (TREE_CODE (cur_type) == POINTER_TYPE)
2491 {
2492 cur_type = TREE_TYPE (cur_type);
2493 if (cur_type == error_mark_node)
2494 break;
2495
2496 /* Check for writing through a NULL pointer. */
2497 if (types->writing_in_flag
2498 && i == 0
2499 && cur_param != 0
2500 && integer_zerop (cur_param))
2501 warning (OPT_Wformat_, "writing through null pointer "
2502 "(argument %d)", arg_num);
2503
2504 /* Check for reading through a NULL pointer. */
2505 if (types->reading_from_flag
2506 && i == 0
2507 && cur_param != 0
2508 && integer_zerop (cur_param))
2509 warning (OPT_Wformat_, "reading through null pointer "
2510 "(argument %d)", arg_num);
2511
2512 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2513 cur_param = TREE_OPERAND (cur_param, 0);
2514 else
2515 cur_param = 0;
2516
2517 /* See if this is an attempt to write into a const type with
2518 scanf or with printf "%n". Note: the writing in happens
2519 at the first indirection only, if for example
2520 void * const * is passed to scanf %p; passing
2521 const void ** is simply passing an incompatible type. */
2522 if (types->writing_in_flag
2523 && i == 0
2524 && (TYPE_READONLY (cur_type)
2525 || (cur_param != 0
2526 && (CONSTANT_CLASS_P (cur_param)
2527 || (DECL_P (cur_param)
2528 && TREE_READONLY (cur_param))))))
2529 warning (OPT_Wformat_, "writing into constant object "
2530 "(argument %d)", arg_num);
2531
2532 /* If there are extra type qualifiers beyond the first
2533 indirection, then this makes the types technically
2534 incompatible. */
2535 if (i > 0
2536 && pedantic
2537 && (TYPE_READONLY (cur_type)
2538 || TYPE_VOLATILE (cur_type)
2539 || TYPE_ATOMIC (cur_type)
2540 || TYPE_RESTRICT (cur_type)))
2541 warning (OPT_Wformat_, "extra type qualifiers in format "
2542 "argument (argument %d)",
2543 arg_num);
2544
2545 }
2546 else
2547 {
2548 format_type_warning (loc, types, wanted_type, orig_cur_type);
2549 break;
2550 }
2551 }
2552
2553 if (i < types->pointer_count)
2554 continue;
2555
2556 cur_type = TYPE_MAIN_VARIANT (cur_type);
2557
2558 /* Check whether the argument type is a character type. This leniency
2559 only applies to certain formats, flagged with 'c'. */
2560 if (types->char_lenient_flag)
2561 char_type_flag = (cur_type == char_type_node
2562 || cur_type == signed_char_type_node
2563 || cur_type == unsigned_char_type_node);
2564
2565 /* Check the type of the "real" argument, if there's a type we want. */
2566 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2567 continue;
2568 /* If we want 'void *', allow any pointer type.
2569 (Anything else would already have got a warning.)
2570 With -Wpedantic, only allow pointers to void and to character
2571 types. */
2572 if (wanted_type == void_type_node
2573 && (!pedantic || (i == 1 && char_type_flag)))
2574 continue;
2575 /* Don't warn about differences merely in signedness, unless
2576 -Wpedantic. With -Wpedantic, warn if the type is a pointer
2577 target and not a character type, and for character types at
2578 a second level of indirection. */
2579 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2580 && TREE_CODE (cur_type) == INTEGER_TYPE
2581 && ((!pedantic && !warn_format_signedness)
2582 || (i == 0 && !warn_format_signedness)
2583 || (i == 1 && char_type_flag))
2584 && (TYPE_UNSIGNED (wanted_type)
2585 ? wanted_type == c_common_unsigned_type (cur_type)
2586 : wanted_type == c_common_signed_type (cur_type)))
2587 continue;
2588 /* Don't warn about differences merely in signedness if we know
2589 that the current type is integer-promoted and its original type
2590 was unsigned such as that it is in the range of WANTED_TYPE. */
2591 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2592 && TREE_CODE (cur_type) == INTEGER_TYPE
2593 && warn_format_signedness
2594 && TYPE_UNSIGNED (wanted_type)
2595 && cur_param != NULL_TREE
2596 && TREE_CODE (cur_param) == NOP_EXPR)
2597 {
2598 tree t = TREE_TYPE (TREE_OPERAND (cur_param, 0));
2599 if (TYPE_UNSIGNED (t)
2600 && cur_type == lang_hooks.types.type_promotes_to (t))
2601 continue;
2602 }
2603 /* Likewise, "signed char", "unsigned char" and "char" are
2604 equivalent but the above test won't consider them equivalent. */
2605 if (wanted_type == char_type_node
2606 && (!pedantic || i < 2)
2607 && char_type_flag)
2608 continue;
2609 if (types->scalar_identity_flag
2610 && (TREE_CODE (cur_type) == TREE_CODE (wanted_type)
2611 || (INTEGRAL_TYPE_P (cur_type)
2612 && INTEGRAL_TYPE_P (wanted_type)))
2613 && TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type))
2614 continue;
2615 /* Now we have a type mismatch. */
2616 format_type_warning (loc, types, wanted_type, orig_cur_type);
2617 }
2618 }
2619
2620
2621 /* Give a warning at LOC about a format argument of different type from that
2622 expected. WANTED_TYPE is the type the argument should have, possibly
2623 stripped of pointer dereferences. The description (such as "field
2624 precision"), the placement in the format string, a possibly more
2625 friendly name of WANTED_TYPE, and the number of pointer dereferences
2626 are taken from TYPE. ARG_TYPE is the type of the actual argument,
2627 or NULL if it is missing. */
2628 static void
format_type_warning(location_t loc,format_wanted_type * type,tree wanted_type,tree arg_type)2629 format_type_warning (location_t loc, format_wanted_type *type,
2630 tree wanted_type, tree arg_type)
2631 {
2632 int kind = type->kind;
2633 const char *wanted_type_name = type->wanted_type_name;
2634 const char *format_start = type->format_start;
2635 int format_length = type->format_length;
2636 int pointer_count = type->pointer_count;
2637 int arg_num = type->arg_num;
2638 unsigned int offset_loc = type->offset_loc;
2639
2640 char *p;
2641 /* If ARG_TYPE is a typedef with a misleading name (for example,
2642 size_t but not the standard size_t expected by printf %zu), avoid
2643 printing the typedef name. */
2644 if (wanted_type_name
2645 && arg_type
2646 && TYPE_NAME (arg_type)
2647 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2648 && DECL_NAME (TYPE_NAME (arg_type))
2649 && !strcmp (wanted_type_name,
2650 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2651 arg_type = TYPE_MAIN_VARIANT (arg_type);
2652 /* The format type and name exclude any '*' for pointers, so those
2653 must be formatted manually. For all the types we currently have,
2654 this is adequate, but formats taking pointers to functions or
2655 arrays would require the full type to be built up in order to
2656 print it with %T. */
2657 p = (char *) alloca (pointer_count + 2);
2658 if (pointer_count == 0)
2659 p[0] = 0;
2660 else if (c_dialect_cxx ())
2661 {
2662 memset (p, '*', pointer_count);
2663 p[pointer_count] = 0;
2664 }
2665 else
2666 {
2667 p[0] = ' ';
2668 memset (p + 1, '*', pointer_count);
2669 p[pointer_count + 1] = 0;
2670 }
2671
2672 loc = location_from_offset (loc, offset_loc);
2673
2674 if (wanted_type_name)
2675 {
2676 if (arg_type)
2677 warning_at (loc, OPT_Wformat_,
2678 "%s %<%s%.*s%> expects argument of type %<%s%s%>, "
2679 "but argument %d has type %qT",
2680 gettext (kind_descriptions[kind]),
2681 (kind == CF_KIND_FORMAT ? "%" : ""),
2682 format_length, format_start,
2683 wanted_type_name, p, arg_num, arg_type);
2684 else
2685 warning_at (loc, OPT_Wformat_,
2686 "%s %<%s%.*s%> expects a matching %<%s%s%> argument",
2687 gettext (kind_descriptions[kind]),
2688 (kind == CF_KIND_FORMAT ? "%" : ""),
2689 format_length, format_start, wanted_type_name, p);
2690 }
2691 else
2692 {
2693 if (arg_type)
2694 warning_at (loc, OPT_Wformat_,
2695 "%s %<%s%.*s%> expects argument of type %<%T%s%>, "
2696 "but argument %d has type %qT",
2697 gettext (kind_descriptions[kind]),
2698 (kind == CF_KIND_FORMAT ? "%" : ""),
2699 format_length, format_start,
2700 wanted_type, p, arg_num, arg_type);
2701 else
2702 warning_at (loc, OPT_Wformat_,
2703 "%s %<%s%.*s%> expects a matching %<%T%s%> argument",
2704 gettext (kind_descriptions[kind]),
2705 (kind == CF_KIND_FORMAT ? "%" : ""),
2706 format_length, format_start, wanted_type, p);
2707 }
2708 }
2709
2710
2711 /* Given a format_char_info array FCI, and a character C, this function
2712 returns the index into the conversion_specs where that specifier's
2713 data is located. The character must exist. */
2714 static unsigned int
find_char_info_specifier_index(const format_char_info * fci,int c)2715 find_char_info_specifier_index (const format_char_info *fci, int c)
2716 {
2717 unsigned i;
2718
2719 for (i = 0; fci->format_chars; i++, fci++)
2720 if (strchr (fci->format_chars, c))
2721 return i;
2722
2723 /* We shouldn't be looking for a non-existent specifier. */
2724 gcc_unreachable ();
2725 }
2726
2727 /* Given a format_length_info array FLI, and a character C, this
2728 function returns the index into the conversion_specs where that
2729 modifier's data is located. The character must exist. */
2730 static unsigned int
find_length_info_modifier_index(const format_length_info * fli,int c)2731 find_length_info_modifier_index (const format_length_info *fli, int c)
2732 {
2733 unsigned i;
2734
2735 for (i = 0; fli->name; i++, fli++)
2736 if (strchr (fli->name, c))
2737 return i;
2738
2739 /* We shouldn't be looking for a non-existent modifier. */
2740 gcc_unreachable ();
2741 }
2742
2743 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2744 use in GCC's __asm_fprintf__ custom format attribute. You must
2745 have set dynamic_format_types before calling this function. */
2746 static void
init_dynamic_asm_fprintf_info(void)2747 init_dynamic_asm_fprintf_info (void)
2748 {
2749 static tree hwi;
2750
2751 if (!hwi)
2752 {
2753 format_length_info *new_asm_fprintf_length_specs;
2754 unsigned int i;
2755
2756 /* Find the underlying type for HOST_WIDE_INT. For the %w
2757 length modifier to work, one must have issued: "typedef
2758 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2759 prior to using that modifier. */
2760 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2761 if (!hwi)
2762 {
2763 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2764 return;
2765 }
2766 hwi = identifier_global_value (hwi);
2767 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2768 {
2769 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2770 return;
2771 }
2772 hwi = DECL_ORIGINAL_TYPE (hwi);
2773 gcc_assert (hwi);
2774 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2775 {
2776 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2777 " or %<long long%>");
2778 return;
2779 }
2780
2781 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2782 new_asm_fprintf_length_specs = (format_length_info *)
2783 xmemdup (asm_fprintf_length_specs,
2784 sizeof (asm_fprintf_length_specs),
2785 sizeof (asm_fprintf_length_specs));
2786
2787 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2788 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2789 if (hwi == long_integer_type_node)
2790 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2791 else if (hwi == long_long_integer_type_node)
2792 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2793 else
2794 gcc_unreachable ();
2795
2796 /* Assign the new data for use. */
2797 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2798 new_asm_fprintf_length_specs;
2799 }
2800 }
2801
2802 /* Determine the type of a "locus" in the code being compiled for use
2803 in GCC's __gcc_gfc__ custom format attribute. You must have set
2804 dynamic_format_types before calling this function. */
2805 static void
init_dynamic_gfc_info(void)2806 init_dynamic_gfc_info (void)
2807 {
2808 static tree locus;
2809
2810 if (!locus)
2811 {
2812 static format_char_info *gfc_fci;
2813
2814 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2815 must have declared 'locus' prior to using this attribute. If
2816 we haven't seen this declarations then you shouldn't use the
2817 specifier requiring that type. */
2818 if ((locus = maybe_get_identifier ("locus")))
2819 {
2820 locus = identifier_global_value (locus);
2821 if (locus)
2822 {
2823 if (TREE_CODE (locus) != TYPE_DECL
2824 || TREE_TYPE (locus) == error_mark_node)
2825 {
2826 error ("%<locus%> is not defined as a type");
2827 locus = 0;
2828 }
2829 else
2830 locus = TREE_TYPE (locus);
2831 }
2832 }
2833
2834 /* Assign the new data for use. */
2835
2836 /* Handle the __gcc_gfc__ format specifics. */
2837 if (!gfc_fci)
2838 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2839 gfc_fci = (format_char_info *)
2840 xmemdup (gcc_gfc_char_table,
2841 sizeof (gcc_gfc_char_table),
2842 sizeof (gcc_gfc_char_table));
2843 if (locus)
2844 {
2845 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2846 gfc_fci[i].types[0].type = &locus;
2847 gfc_fci[i].pointer_count = 1;
2848 }
2849 }
2850 }
2851
2852 /* Determine the types of "tree" and "location_t" in the code being
2853 compiled for use in GCC's diagnostic custom format attributes. You
2854 must have set dynamic_format_types before calling this function. */
2855 static void
init_dynamic_diag_info(void)2856 init_dynamic_diag_info (void)
2857 {
2858 static tree t, loc, hwi;
2859
2860 if (!loc || !t || !hwi)
2861 {
2862 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2863 static format_length_info *diag_ls;
2864 unsigned int i;
2865
2866 /* For the GCC-diagnostics custom format specifiers to work, one
2867 must have declared 'tree' and/or 'location_t' prior to using
2868 those attributes. If we haven't seen these declarations then
2869 you shouldn't use the specifiers requiring these types.
2870 However we don't force a hard ICE because we may see only one
2871 or the other type. */
2872 if ((loc = maybe_get_identifier ("location_t")))
2873 {
2874 loc = identifier_global_value (loc);
2875 if (loc)
2876 {
2877 if (TREE_CODE (loc) != TYPE_DECL)
2878 {
2879 error ("%<location_t%> is not defined as a type");
2880 loc = 0;
2881 }
2882 else
2883 loc = TREE_TYPE (loc);
2884 }
2885 }
2886
2887 /* We need to grab the underlying 'union tree_node' so peek into
2888 an extra type level. */
2889 if ((t = maybe_get_identifier ("tree")))
2890 {
2891 t = identifier_global_value (t);
2892 if (t)
2893 {
2894 if (TREE_CODE (t) != TYPE_DECL)
2895 {
2896 error ("%<tree%> is not defined as a type");
2897 t = 0;
2898 }
2899 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2900 {
2901 error ("%<tree%> is not defined as a pointer type");
2902 t = 0;
2903 }
2904 else
2905 t = TREE_TYPE (TREE_TYPE (t));
2906 }
2907 }
2908
2909 /* Find the underlying type for HOST_WIDE_INT. For the %w
2910 length modifier to work, one must have issued: "typedef
2911 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2912 prior to using that modifier. */
2913 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2914 {
2915 hwi = identifier_global_value (hwi);
2916 if (hwi)
2917 {
2918 if (TREE_CODE (hwi) != TYPE_DECL)
2919 {
2920 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2921 hwi = 0;
2922 }
2923 else
2924 {
2925 hwi = DECL_ORIGINAL_TYPE (hwi);
2926 gcc_assert (hwi);
2927 if (hwi != long_integer_type_node
2928 && hwi != long_long_integer_type_node)
2929 {
2930 error ("%<__gcc_host_wide_int__%> is not defined"
2931 " as %<long%> or %<long long%>");
2932 hwi = 0;
2933 }
2934 }
2935 }
2936 }
2937
2938 /* Assign the new data for use. */
2939
2940 /* All the GCC diag formats use the same length specs. */
2941 if (!diag_ls)
2942 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2943 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2944 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2945 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2946 diag_ls = (format_length_info *)
2947 xmemdup (gcc_diag_length_specs,
2948 sizeof (gcc_diag_length_specs),
2949 sizeof (gcc_diag_length_specs));
2950 if (hwi)
2951 {
2952 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2953 i = find_length_info_modifier_index (diag_ls, 'w');
2954 if (hwi == long_integer_type_node)
2955 diag_ls[i].index = FMT_LEN_l;
2956 else if (hwi == long_long_integer_type_node)
2957 diag_ls[i].index = FMT_LEN_ll;
2958 else
2959 gcc_unreachable ();
2960 }
2961
2962 /* Handle the __gcc_diag__ format specifics. */
2963 if (!diag_fci)
2964 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2965 diag_fci = (format_char_info *)
2966 xmemdup (gcc_diag_char_table,
2967 sizeof (gcc_diag_char_table),
2968 sizeof (gcc_diag_char_table));
2969 if (t)
2970 {
2971 i = find_char_info_specifier_index (diag_fci, 'K');
2972 diag_fci[i].types[0].type = &t;
2973 diag_fci[i].pointer_count = 1;
2974 }
2975
2976 /* Handle the __gcc_tdiag__ format specifics. */
2977 if (!tdiag_fci)
2978 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2979 tdiag_fci = (format_char_info *)
2980 xmemdup (gcc_tdiag_char_table,
2981 sizeof (gcc_tdiag_char_table),
2982 sizeof (gcc_tdiag_char_table));
2983 if (t)
2984 {
2985 /* All specifiers taking a tree share the same struct. */
2986 i = find_char_info_specifier_index (tdiag_fci, 'D');
2987 tdiag_fci[i].types[0].type = &t;
2988 tdiag_fci[i].pointer_count = 1;
2989 i = find_char_info_specifier_index (tdiag_fci, 'K');
2990 tdiag_fci[i].types[0].type = &t;
2991 tdiag_fci[i].pointer_count = 1;
2992 }
2993
2994 /* Handle the __gcc_cdiag__ format specifics. */
2995 if (!cdiag_fci)
2996 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2997 cdiag_fci = (format_char_info *)
2998 xmemdup (gcc_cdiag_char_table,
2999 sizeof (gcc_cdiag_char_table),
3000 sizeof (gcc_cdiag_char_table));
3001 if (t)
3002 {
3003 /* All specifiers taking a tree share the same struct. */
3004 i = find_char_info_specifier_index (cdiag_fci, 'D');
3005 cdiag_fci[i].types[0].type = &t;
3006 cdiag_fci[i].pointer_count = 1;
3007 i = find_char_info_specifier_index (cdiag_fci, 'K');
3008 cdiag_fci[i].types[0].type = &t;
3009 cdiag_fci[i].pointer_count = 1;
3010 }
3011
3012 /* Handle the __gcc_cxxdiag__ format specifics. */
3013 if (!cxxdiag_fci)
3014 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
3015 cxxdiag_fci = (format_char_info *)
3016 xmemdup (gcc_cxxdiag_char_table,
3017 sizeof (gcc_cxxdiag_char_table),
3018 sizeof (gcc_cxxdiag_char_table));
3019 if (t)
3020 {
3021 /* All specifiers taking a tree share the same struct. */
3022 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
3023 cxxdiag_fci[i].types[0].type = &t;
3024 cxxdiag_fci[i].pointer_count = 1;
3025 i = find_char_info_specifier_index (cxxdiag_fci, 'K');
3026 cxxdiag_fci[i].types[0].type = &t;
3027 cxxdiag_fci[i].pointer_count = 1;
3028 }
3029 }
3030 }
3031
3032 #ifdef TARGET_FORMAT_TYPES
3033 extern const format_kind_info TARGET_FORMAT_TYPES[];
3034 #endif
3035
3036 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
3037 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
3038 #endif
3039 #ifdef TARGET_OVERRIDES_FORMAT_INIT
3040 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
3041 #endif
3042
3043 /* Attributes such as "printf" are equivalent to those such as
3044 "gnu_printf" unless this is overridden by a target. */
3045 static const target_ovr_attr gnu_target_overrides_format_attributes[] =
3046 {
3047 { "gnu_printf", "printf" },
3048 { "gnu_scanf", "scanf" },
3049 { "gnu_strftime", "strftime" },
3050 { "gnu_strfmon", "strfmon" },
3051 { NULL, NULL }
3052 };
3053
3054 /* Translate to unified attribute name. This is used in decode_format_type and
3055 decode_format_attr. In attr_name the user specified argument is passed. It
3056 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
3057 or the attr_name passed to this function, if there is no matching entry. */
3058 static const char *
convert_format_name_to_system_name(const char * attr_name)3059 convert_format_name_to_system_name (const char *attr_name)
3060 {
3061 int i;
3062
3063 if (attr_name == NULL || *attr_name == 0
3064 || strncmp (attr_name, "gcc_", 4) == 0)
3065 return attr_name;
3066 #ifdef TARGET_OVERRIDES_FORMAT_INIT
3067 TARGET_OVERRIDES_FORMAT_INIT ();
3068 #endif
3069
3070 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
3071 /* Check if format attribute is overridden by target. */
3072 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
3073 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
3074 {
3075 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
3076 {
3077 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
3078 attr_name))
3079 return attr_name;
3080 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
3081 attr_name))
3082 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
3083 }
3084 }
3085 #endif
3086 /* Otherwise default to gnu format. */
3087 for (i = 0;
3088 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
3089 ++i)
3090 {
3091 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
3092 attr_name))
3093 return attr_name;
3094 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
3095 attr_name))
3096 return gnu_target_overrides_format_attributes[i].named_attr_src;
3097 }
3098
3099 return attr_name;
3100 }
3101
3102 /* Return true if TATTR_NAME and ATTR_NAME are the same format attribute,
3103 counting "name" and "__name__" as the same, false otherwise. */
3104 static bool
cmp_attribs(const char * tattr_name,const char * attr_name)3105 cmp_attribs (const char *tattr_name, const char *attr_name)
3106 {
3107 int alen = strlen (attr_name);
3108 int slen = (tattr_name ? strlen (tattr_name) : 0);
3109 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_'
3110 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_')
3111 {
3112 attr_name += 2;
3113 alen -= 4;
3114 }
3115 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0)
3116 return false;
3117 return true;
3118 }
3119
3120 /* Handle a "format" attribute; arguments as in
3121 struct attribute_spec.handler. */
3122 tree
handle_format_attribute(tree * node,tree ARG_UNUSED (name),tree args,int flags,bool * no_add_attrs)3123 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
3124 int flags, bool *no_add_attrs)
3125 {
3126 tree type = *node;
3127 function_format_info info;
3128
3129 #ifdef TARGET_FORMAT_TYPES
3130 /* If the target provides additional format types, we need to
3131 add them to FORMAT_TYPES at first use. */
3132 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
3133 {
3134 dynamic_format_types = XNEWVEC (format_kind_info,
3135 n_format_types + TARGET_N_FORMAT_TYPES);
3136 memcpy (dynamic_format_types, format_types_orig,
3137 sizeof (format_types_orig));
3138 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
3139 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
3140
3141 format_types = dynamic_format_types;
3142 /* Provide a reference for the first potential external type. */
3143 first_target_format_type = n_format_types;
3144 n_format_types += TARGET_N_FORMAT_TYPES;
3145 }
3146 #endif
3147
3148 if (!decode_format_attr (args, &info, 0))
3149 {
3150 *no_add_attrs = true;
3151 return NULL_TREE;
3152 }
3153
3154 if (prototype_p (type))
3155 {
3156 if (!check_format_string (type, info.format_num, flags,
3157 no_add_attrs, info.format_type))
3158 return NULL_TREE;
3159
3160 if (info.first_arg_num != 0)
3161 {
3162 unsigned HOST_WIDE_INT arg_num = 1;
3163 function_args_iterator iter;
3164 tree arg_type;
3165
3166 /* Verify that first_arg_num points to the last arg,
3167 the ... */
3168 FOREACH_FUNCTION_ARGS (type, arg_type, iter)
3169 arg_num++;
3170
3171 if (arg_num != info.first_arg_num)
3172 {
3173 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
3174 error ("args to be formatted is not %<...%>");
3175 *no_add_attrs = true;
3176 return NULL_TREE;
3177 }
3178 }
3179 }
3180
3181 /* Check if this is a strftime variant. Just for this variant
3182 FMT_FLAG_ARG_CONVERT is not set. */
3183 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
3184 && info.first_arg_num != 0)
3185 {
3186 error ("strftime formats cannot format arguments");
3187 *no_add_attrs = true;
3188 return NULL_TREE;
3189 }
3190
3191 /* If this is a custom GCC-internal format type, we have to
3192 initialize certain bits at runtime. */
3193 if (info.format_type == asm_fprintf_format_type
3194 || info.format_type == gcc_gfc_format_type
3195 || info.format_type == gcc_diag_format_type
3196 || info.format_type == gcc_tdiag_format_type
3197 || info.format_type == gcc_cdiag_format_type
3198 || info.format_type == gcc_cxxdiag_format_type)
3199 {
3200 /* Our first time through, we have to make sure that our
3201 format_type data is allocated dynamically and is modifiable. */
3202 if (!dynamic_format_types)
3203 format_types = dynamic_format_types = (format_kind_info *)
3204 xmemdup (format_types_orig, sizeof (format_types_orig),
3205 sizeof (format_types_orig));
3206
3207 /* If this is format __asm_fprintf__, we have to initialize
3208 GCC's notion of HOST_WIDE_INT for checking %wd. */
3209 if (info.format_type == asm_fprintf_format_type)
3210 init_dynamic_asm_fprintf_info ();
3211 /* If this is format __gcc_gfc__, we have to initialize GCC's
3212 notion of 'locus' at runtime for %L. */
3213 else if (info.format_type == gcc_gfc_format_type)
3214 init_dynamic_gfc_info ();
3215 /* If this is one of the diagnostic attributes, then we have to
3216 initialize 'location_t' and 'tree' at runtime. */
3217 else if (info.format_type == gcc_diag_format_type
3218 || info.format_type == gcc_tdiag_format_type
3219 || info.format_type == gcc_cdiag_format_type
3220 || info.format_type == gcc_cxxdiag_format_type)
3221 init_dynamic_diag_info ();
3222 else
3223 gcc_unreachable ();
3224 }
3225
3226 return NULL_TREE;
3227 }
3228