1 /* Check calls to formatted I/O functions (-Wformat).
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
30 #include "diagnostic.h"
31 #include "langhooks.h"
33 #include "alloc-pool.h"
35 /* Set format warning options according to a -Wformat=n option. */
38 set_Wformat (int setting)
40 warn_format = setting;
41 warn_format_extra_args = setting;
42 warn_format_zero_length = setting;
43 warn_format_contains_nul = setting;
46 warn_format_nonliteral = setting;
47 warn_format_security = setting;
48 warn_format_y2k = setting;
50 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */
52 warn_nonnull = setting;
56 /* Handle attributes associated with format checking. */
58 /* This must be in the same order as format_types, except for
59 format_type_error. Target-specific format types do not have
60 matching enum values. */
61 enum format_type { printf_format_type, asm_fprintf_format_type,
62 gcc_diag_format_type, gcc_tdiag_format_type,
63 gcc_cdiag_format_type,
64 gcc_cxxdiag_format_type, gcc_gfc_format_type,
65 format_type_error = -1};
67 typedef struct function_format_info
69 int format_type; /* type of format (printf, scanf, etc.) */
70 unsigned HOST_WIDE_INT format_num; /* number of format argument */
71 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */
72 } function_format_info;
74 static bool decode_format_attr (tree, function_format_info *, int);
75 static int decode_format_type (const char *);
77 static bool check_format_string (tree argument,
78 unsigned HOST_WIDE_INT format_num,
79 int flags, bool *no_add_attrs);
80 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
82 static const char *convert_format_name_to_system_name (const char *attr_name);
83 static bool cmp_attribs (const char *tattr_name, const char *attr_name);
85 /* Handle a "format_arg" attribute; arguments as in
86 struct attribute_spec.handler. */
88 handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
89 tree args, int flags, bool *no_add_attrs)
92 tree format_num_expr = TREE_VALUE (args);
93 unsigned HOST_WIDE_INT format_num = 0;
96 if (!get_constant (format_num_expr, &format_num, 0))
98 error ("format string has invalid operand number");
103 argument = TYPE_ARG_TYPES (type);
106 if (!check_format_string (argument, format_num, flags, no_add_attrs))
110 if (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
111 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
114 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
115 error ("function does not return string type");
116 *no_add_attrs = true;
123 /* Verify that the format_num argument is actually a string, in case
124 the format attribute is in error. */
126 check_format_string (tree argument, unsigned HOST_WIDE_INT format_num,
127 int flags, bool *no_add_attrs)
129 unsigned HOST_WIDE_INT i;
131 for (i = 1; i != format_num; i++)
135 argument = TREE_CHAIN (argument);
139 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
140 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
143 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
144 error ("format string argument not a string type");
145 *no_add_attrs = true;
152 /* Verify EXPR is a constant, and store its value.
153 If validated_p is true there should be no errors.
154 Returns true on success, false otherwise. */
156 get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
158 if (TREE_CODE (expr) != INTEGER_CST || TREE_INT_CST_HIGH (expr) != 0)
160 gcc_assert (!validated_p);
164 *value = TREE_INT_CST_LOW (expr);
169 /* Decode the arguments to a "format" attribute into a
170 function_format_info structure. It is already known that the list
171 is of the right length. If VALIDATED_P is true, then these
172 attributes have already been validated and must not be erroneous;
173 if false, it will give an error message. Returns true if the
174 attributes are successfully decoded, false otherwise. */
177 decode_format_attr (tree args, function_format_info *info, int validated_p)
179 tree format_type_id = TREE_VALUE (args);
180 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
181 tree first_arg_num_expr
182 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
184 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
186 gcc_assert (!validated_p);
187 error ("unrecognized format specifier");
192 const char *p = IDENTIFIER_POINTER (format_type_id);
194 p = convert_format_name_to_system_name (p);
196 info->format_type = decode_format_type (p);
198 if (info->format_type == format_type_error)
200 gcc_assert (!validated_p);
201 warning (OPT_Wformat, "%qE is an unrecognized format function type",
207 if (!get_constant (format_num_expr, &info->format_num, validated_p))
209 error ("format string has invalid operand number");
213 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
215 error ("%<...%> has invalid operand number");
219 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
221 gcc_assert (!validated_p);
222 error ("format string argument follows the args to be formatted");
229 /* Check a call to a format function against a parameter list. */
231 /* The C standard version C++ is treated as equivalent to
232 or inheriting from, for the purpose of format features supported. */
233 #define CPLUSPLUS_STD_VER STD_C94
234 /* The C standard version we are checking formats against when pedantic. */
235 #define C_STD_VER ((int) (c_dialect_cxx () \
236 ? CPLUSPLUS_STD_VER \
239 : (flag_isoc94 ? STD_C94 : STD_C89))))
240 /* The name to give to the standard version we are warning about when
241 pedantic. FEATURE_VER is the version in which the feature warned out
242 appeared, which is higher than C_STD_VER. */
243 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
245 : ((FEATURE_VER) == STD_EXT \
248 /* Adjust a C standard version, which may be STD_C9L, to account for
249 -Wno-long-long. Returns other standard versions unchanged. */
250 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
251 ? (warn_long_long ? STD_C99 : STD_C89) \
254 /* Structure describing details of a type expected in format checking,
255 and the type to check against it. */
256 typedef struct format_wanted_type
258 /* The type wanted. */
260 /* The name of this type to use in diagnostics. */
261 const char *wanted_type_name;
262 /* The level of indirection through pointers at which this type occurs. */
264 /* Whether, when pointer_count is 1, to allow any character type when
265 pedantic, rather than just the character or void type specified. */
266 int char_lenient_flag;
267 /* Whether the argument, dereferenced once, is written into and so the
268 argument must not be a pointer to a const-qualified type. */
270 /* Whether the argument, dereferenced once, is read from and so
271 must not be a NULL pointer. */
272 int reading_from_flag;
273 /* If warnings should be of the form "field precision should have
274 type 'int'", the name to use (in this case "field precision"),
275 otherwise NULL, for "format expects type 'long'" type
278 /* The actual parameter to check against the wanted type. */
280 /* The argument number of that parameter. */
282 /* The next type to check for this format conversion, or NULL if none. */
283 struct format_wanted_type *next;
284 } format_wanted_type;
286 /* Convenience macro for format_length_info meaning unused. */
287 #define NO_FMT NULL, FMT_LEN_none, STD_C89
289 static const format_length_info printf_length_specs[] =
291 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
292 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
293 { "q", FMT_LEN_ll, STD_EXT, NO_FMT },
294 { "L", FMT_LEN_L, STD_C89, NO_FMT },
295 { "z", FMT_LEN_z, STD_C99, NO_FMT },
296 { "Z", FMT_LEN_z, STD_EXT, NO_FMT },
297 { "t", FMT_LEN_t, STD_C99, NO_FMT },
298 { "j", FMT_LEN_j, STD_C99, NO_FMT },
299 { "H", FMT_LEN_H, STD_EXT, NO_FMT },
300 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
304 /* Length specifiers valid for asm_fprintf. */
305 static const format_length_info asm_fprintf_length_specs[] =
307 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
308 { "w", FMT_LEN_none, STD_C89, NO_FMT },
312 /* Length specifiers valid for GCC diagnostics. */
313 static const format_length_info gcc_diag_length_specs[] =
315 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
316 { "w", FMT_LEN_none, STD_C89, NO_FMT },
320 /* The custom diagnostics all accept the same length specifiers. */
321 #define gcc_tdiag_length_specs gcc_diag_length_specs
322 #define gcc_cdiag_length_specs gcc_diag_length_specs
323 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
325 /* This differs from printf_length_specs only in that "Z" is not accepted. */
326 static const format_length_info scanf_length_specs[] =
328 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
329 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
330 { "q", FMT_LEN_ll, STD_EXT, NO_FMT },
331 { "L", FMT_LEN_L, STD_C89, NO_FMT },
332 { "z", FMT_LEN_z, STD_C99, NO_FMT },
333 { "t", FMT_LEN_t, STD_C99, NO_FMT },
334 { "j", FMT_LEN_j, STD_C99, NO_FMT },
335 { "H", FMT_LEN_H, STD_EXT, NO_FMT },
336 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
341 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
342 make no sense for a format type not part of any C standard version. */
343 static const format_length_info strfmon_length_specs[] =
345 /* A GNU extension. */
346 { "L", FMT_LEN_L, STD_C89, NO_FMT },
351 /* For now, the Fortran front-end routines only use l as length modifier. */
352 static const format_length_info gcc_gfc_length_specs[] =
354 { "l", FMT_LEN_l, STD_C89, NO_FMT },
359 static const format_flag_spec printf_flag_specs[] =
361 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
362 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
363 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
364 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
365 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
366 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
367 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
368 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
369 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
370 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
371 { 0, 0, 0, NULL, NULL, STD_C89 }
375 static const format_flag_pair printf_flag_pairs[] =
379 { '0', 'p', 1, 'i' },
383 static const format_flag_spec asm_fprintf_flag_specs[] =
385 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
386 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
387 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
388 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
389 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
390 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
391 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
392 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
393 { 0, 0, 0, NULL, NULL, STD_C89 }
396 static const format_flag_pair asm_fprintf_flag_pairs[] =
400 { '0', 'p', 1, 'i' },
404 static const format_flag_pair gcc_diag_flag_pairs[] =
409 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
410 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
411 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
413 static const format_flag_pair gcc_gfc_flag_pairs[] =
418 static const format_flag_spec gcc_diag_flag_specs[] =
420 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
421 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
422 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
423 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
424 { 0, 0, 0, NULL, NULL, STD_C89 }
427 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
428 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
430 static const format_flag_spec gcc_cxxdiag_flag_specs[] =
432 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
433 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
434 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
435 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
436 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
437 { 0, 0, 0, NULL, NULL, STD_C89 }
440 static const format_flag_spec scanf_flag_specs[] =
442 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
443 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
444 { 'm', 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT },
445 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
446 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
447 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
448 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
449 { 0, 0, 0, NULL, NULL, STD_C89 }
453 static const format_flag_pair scanf_flag_pairs[] =
461 static const format_flag_spec strftime_flag_specs[] =
463 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
464 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
465 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
466 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
467 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
468 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
469 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
470 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
471 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
472 { 0, 0, 0, NULL, NULL, STD_C89 }
476 static const format_flag_pair strftime_flag_pairs[] =
487 static const format_flag_spec strfmon_flag_specs[] =
489 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
490 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
491 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
492 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
493 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
494 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
495 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
496 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
497 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
498 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
499 { 0, 0, 0, NULL, NULL, STD_C89 }
502 static const format_flag_pair strfmon_flag_pairs[] =
509 static const format_char_info print_char_table[] =
511 /* C89 conversion specifiers. */
512 { "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 },
513 { "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 },
514 { "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 },
515 { "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 },
516 { "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 },
517 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
518 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
519 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
520 { "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 },
521 /* C99 conversion specifiers. */
522 { "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 },
523 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
524 /* X/Open conversion specifiers. */
525 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
526 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
527 /* GNU conversion specifiers. */
528 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
529 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
532 static const format_char_info asm_fprintf_char_table[] =
534 /* C89 conversion specifiers. */
535 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
536 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
537 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
538 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
539 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
541 /* asm_fprintf conversion specifiers. */
542 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
543 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
544 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
545 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
546 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
547 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
548 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
549 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
552 static const format_char_info gcc_diag_char_table[] =
554 /* C89 conversion specifiers. */
555 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
556 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
557 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
558 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
559 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
560 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
562 /* Custom conversion specifiers. */
564 /* These will require a "tree" at runtime. */
565 { "K", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
567 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
568 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
569 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
572 static const format_char_info gcc_tdiag_char_table[] =
574 /* C89 conversion specifiers. */
575 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
576 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
577 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
578 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
579 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
580 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
582 /* Custom conversion specifiers. */
584 /* These will require a "tree" at runtime. */
585 { "DFKTE", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
587 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
588 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
589 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
592 static const format_char_info gcc_cdiag_char_table[] =
594 /* C89 conversion specifiers. */
595 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
596 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
597 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
598 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
599 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
600 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
602 /* Custom conversion specifiers. */
604 /* These will require a "tree" at runtime. */
605 { "DEFKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
607 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
608 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
609 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
612 static const format_char_info gcc_cxxdiag_char_table[] =
614 /* C89 conversion specifiers. */
615 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
616 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
617 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
618 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
619 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
620 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
622 /* Custom conversion specifiers. */
624 /* These will require a "tree" at runtime. */
625 { "ADEFKTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
627 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
628 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
630 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
631 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
632 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
635 static const format_char_info gcc_gfc_char_table[] =
637 /* C89 conversion specifiers. */
638 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
639 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
640 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
641 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
643 /* gfc conversion specifiers. */
645 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
647 /* This will require a "locus" at runtime. */
648 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
650 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
653 static const format_char_info scan_char_table[] =
655 /* C89 conversion specifiers. */
656 { "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 },
657 { "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 },
658 { "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 },
659 { "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 },
660 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL },
661 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL },
662 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL },
663 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
664 { "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 },
665 /* C99 conversion specifiers. */
666 { "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 },
667 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
668 /* X/Open conversion specifiers. */
669 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL },
670 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL },
671 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
674 static const format_char_info time_char_table[] =
676 /* C89 conversion specifiers. */
677 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
678 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
679 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
680 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
681 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
682 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
683 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
684 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
685 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
686 /* C99 conversion specifiers. */
687 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
688 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
689 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
690 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
691 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
692 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
693 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
694 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
695 /* GNU conversion specifiers. */
696 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
697 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
698 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
701 static const format_char_info monetary_char_table[] =
703 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
704 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
707 /* This must be in the same order as enum format_type. */
708 static const format_kind_info format_types_orig[] =
710 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
711 printf_flag_specs, printf_flag_pairs,
712 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
713 'w', 0, 'p', 0, 'L', 0,
714 &integer_type_node, &integer_type_node
716 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
717 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
718 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
719 'w', 0, 'p', 0, 'L', 0,
722 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
723 gcc_diag_flag_specs, gcc_diag_flag_pairs,
724 FMT_FLAG_ARG_CONVERT,
725 0, 0, 'p', 0, 'L', 0,
726 NULL, &integer_type_node
728 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
729 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
730 FMT_FLAG_ARG_CONVERT,
731 0, 0, 'p', 0, 'L', 0,
732 NULL, &integer_type_node
734 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
735 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
736 FMT_FLAG_ARG_CONVERT,
737 0, 0, 'p', 0, 'L', 0,
738 NULL, &integer_type_node
740 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
741 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
742 FMT_FLAG_ARG_CONVERT,
743 0, 0, 'p', 0, 'L', 0,
744 NULL, &integer_type_node
746 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL,
747 NULL, gcc_gfc_flag_pairs,
748 FMT_FLAG_ARG_CONVERT,
752 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
753 scanf_flag_specs, scanf_flag_pairs,
754 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
755 'w', 0, 0, '*', 'L', 'm',
758 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
759 strftime_flag_specs, strftime_flag_pairs,
760 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
763 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
764 strfmon_flag_specs, strfmon_flag_pairs,
765 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
770 /* This layer of indirection allows GCC to reassign format_types with
771 new data if necessary, while still allowing the original data to be
773 static const format_kind_info *format_types = format_types_orig;
774 /* We can modify this one. We also add target-specific format types
775 to the end of the array. */
776 static format_kind_info *dynamic_format_types;
778 static int n_format_types = ARRAY_SIZE (format_types_orig);
780 /* Structure detailing the results of checking a format function call
781 where the format expression may be a conditional expression with
782 many leaves resulting from nested conditional expressions. */
785 /* Number of leaves of the format argument that could not be checked
786 as they were not string literals. */
787 int number_non_literal;
788 /* Number of leaves of the format argument that were null pointers or
789 string literals, but had extra format arguments. */
790 int number_extra_args;
791 /* Number of leaves of the format argument that were null pointers or
792 string literals, but had extra format arguments and used $ operand
794 int number_dollar_extra_args;
795 /* Number of leaves of the format argument that were wide string
798 /* Number of leaves of the format argument that were empty strings. */
800 /* Number of leaves of the format argument that were unterminated
802 int number_unterminated;
803 /* Number of leaves of the format argument that were not counted above. */
805 } format_check_results;
809 format_check_results *res;
810 function_format_info *info;
812 } format_check_context;
814 static void check_format_info (function_format_info *, tree);
815 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
816 static void check_format_info_main (format_check_results *,
817 function_format_info *,
818 const char *, int, tree,
819 unsigned HOST_WIDE_INT, alloc_pool);
821 static void init_dollar_format_checking (int, tree);
822 static int maybe_read_dollar_number (const char **, int,
823 tree, tree *, const format_kind_info *);
824 static bool avoid_dollar_number (const char *);
825 static void finish_dollar_format_checking (format_check_results *, int);
827 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
830 static void check_format_types (format_wanted_type *, const char *, int);
831 static void format_type_warning (const char *, const char *, int, tree,
832 int, const char *, tree, int);
834 /* Decode a format type from a string, returning the type, or
835 format_type_error if not valid, in which case the caller should print an
838 decode_format_type (const char *s)
843 s = convert_format_name_to_system_name (s);
845 for (i = 0; i < n_format_types; i++)
848 if (!strcmp (s, format_types[i].name))
850 alen = strlen (format_types[i].name);
851 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
852 && s[slen - 1] == '_' && s[slen - 2] == '_'
853 && !strncmp (s + 2, format_types[i].name, alen))
856 return format_type_error;
860 /* Check the argument list of a call to printf, scanf, etc.
861 ATTRS are the attributes on the function type. There are NARGS argument
862 values in the array ARGARRAY.
863 Also, if -Wmissing-format-attribute,
864 warn for calls to vprintf or vscanf in functions with no such format
865 attribute themselves. */
868 check_function_format (tree attrs, int nargs, tree *argarray)
872 /* See if this function has any format attributes. */
873 for (a = attrs; a; a = TREE_CHAIN (a))
875 if (is_attribute_p ("format", TREE_PURPOSE (a)))
878 function_format_info info;
879 decode_format_attr (TREE_VALUE (a), &info, 1);
882 /* FIXME: Rewrite all the internal functions in this file
883 to use the ARGARRAY directly instead of constructing this
885 tree params = NULL_TREE;
887 for (i = nargs - 1; i >= 0; i--)
888 params = tree_cons (NULL_TREE, argarray[i], params);
889 check_format_info (&info, params);
891 if (warn_missing_format_attribute && info.first_arg_num == 0
892 && (format_types[info.format_type].flags
893 & (int) FMT_FLAG_ARG_CONVERT))
896 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
899 if (is_attribute_p ("format", TREE_PURPOSE (c))
900 && (decode_format_type (IDENTIFIER_POINTER
901 (TREE_VALUE (TREE_VALUE (c))))
902 == info.format_type))
906 /* Check if the current function has a parameter to which
907 the format attribute could be attached; if not, it
908 can't be a candidate for a format attribute, despite
909 the vprintf-like or vscanf-like call. */
911 for (args = DECL_ARGUMENTS (current_function_decl);
913 args = TREE_CHAIN (args))
915 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
916 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
921 warning (OPT_Wmissing_format_attribute, "function might "
922 "be possible candidate for %qs format attribute",
923 format_types[info.format_type].name);
931 /* Variables used by the checking of $ operand number formats. */
932 static char *dollar_arguments_used = NULL;
933 static char *dollar_arguments_pointer_p = NULL;
934 static int dollar_arguments_alloc = 0;
935 static int dollar_arguments_count;
936 static int dollar_first_arg_num;
937 static int dollar_max_arg_used;
938 static int dollar_format_warned;
940 /* Initialize the checking for a format string that may contain $
941 parameter number specifications; we will need to keep track of whether
942 each parameter has been used. FIRST_ARG_NUM is the number of the first
943 argument that is a parameter to the format, or 0 for a vprintf-style
944 function; PARAMS is the list of arguments starting at this argument. */
947 init_dollar_format_checking (int first_arg_num, tree params)
949 tree oparams = params;
951 dollar_first_arg_num = first_arg_num;
952 dollar_arguments_count = 0;
953 dollar_max_arg_used = 0;
954 dollar_format_warned = 0;
955 if (first_arg_num > 0)
959 dollar_arguments_count++;
960 params = TREE_CHAIN (params);
963 if (dollar_arguments_alloc < dollar_arguments_count)
965 if (dollar_arguments_used)
966 free (dollar_arguments_used);
967 if (dollar_arguments_pointer_p)
968 free (dollar_arguments_pointer_p);
969 dollar_arguments_alloc = dollar_arguments_count;
970 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
971 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
973 if (dollar_arguments_alloc)
975 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
976 if (first_arg_num > 0)
982 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
984 params = TREE_CHAIN (params);
992 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
993 is set, it is an error if one is not found; otherwise, it is OK. If
994 such a number is found, check whether it is within range and mark that
995 numbered operand as being used for later checking. Returns the operand
996 number if found and within range, zero if no such number was found and
997 this is OK, or -1 on error. PARAMS points to the first operand of the
998 format; PARAM_PTR is made to point to the parameter referred to. If
999 a $ format is found, *FORMAT is updated to point just after it. */
1002 maybe_read_dollar_number (const char **format,
1003 int dollar_needed, tree params, tree *param_ptr,
1004 const format_kind_info *fki)
1008 const char *fcp = *format;
1009 if (!ISDIGIT (*fcp))
1013 warning (OPT_Wformat, "missing $ operand number in format");
1021 while (ISDIGIT (*fcp))
1024 nargnum = 10 * argnum + (*fcp - '0');
1025 if (nargnum < 0 || nargnum / 10 != argnum)
1034 warning (OPT_Wformat, "missing $ operand number in format");
1041 if (pedantic && !dollar_format_warned)
1043 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1044 C_STD_NAME (STD_EXT));
1045 dollar_format_warned = 1;
1047 if (overflow_flag || argnum == 0
1048 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1050 warning (OPT_Wformat, "operand number out of range in format");
1053 if (argnum > dollar_max_arg_used)
1054 dollar_max_arg_used = argnum;
1055 /* For vprintf-style functions we may need to allocate more memory to
1056 track which arguments are used. */
1057 while (dollar_arguments_alloc < dollar_max_arg_used)
1060 nalloc = 2 * dollar_arguments_alloc + 16;
1061 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1063 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1065 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1066 nalloc - dollar_arguments_alloc);
1067 dollar_arguments_alloc = nalloc;
1069 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1070 && dollar_arguments_used[argnum - 1] == 1)
1072 dollar_arguments_used[argnum - 1] = 2;
1073 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1077 dollar_arguments_used[argnum - 1] = 1;
1078 if (dollar_first_arg_num)
1081 *param_ptr = params;
1082 for (i = 1; i < argnum && *param_ptr != 0; i++)
1083 *param_ptr = TREE_CHAIN (*param_ptr);
1085 /* This case shouldn't be caught here. */
1086 gcc_assert (*param_ptr);
1093 /* Ensure that FORMAT does not start with a decimal number followed by
1094 a $; give a diagnostic and return true if it does, false otherwise. */
1097 avoid_dollar_number (const char *format)
1099 if (!ISDIGIT (*format))
1101 while (ISDIGIT (*format))
1105 warning (OPT_Wformat, "$ operand number used after format without operand number");
1112 /* Finish the checking for a format string that used $ operand number formats
1113 instead of non-$ formats. We check for unused operands before used ones
1114 (a serious error, since the implementation of the format function
1115 can't know what types to pass to va_arg to find the later arguments).
1116 and for unused operands at the end of the format (if we know how many
1117 arguments the format had, so not for vprintf). If there were operand
1118 numbers out of range on a non-vprintf-style format, we won't have reached
1119 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1123 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1126 bool found_pointer_gap = false;
1127 for (i = 0; i < dollar_max_arg_used; i++)
1129 if (!dollar_arguments_used[i])
1131 if (pointer_gap_ok && (dollar_first_arg_num == 0
1132 || dollar_arguments_pointer_p[i]))
1133 found_pointer_gap = true;
1135 warning (OPT_Wformat,
1136 "format argument %d unused before used argument %d in $-style format",
1137 i + 1, dollar_max_arg_used);
1140 if (found_pointer_gap
1141 || (dollar_first_arg_num
1142 && dollar_max_arg_used < dollar_arguments_count))
1144 res->number_other--;
1145 res->number_dollar_extra_args++;
1150 /* Retrieve the specification for a format flag. SPEC contains the
1151 specifications for format flags for the applicable kind of format.
1152 FLAG is the flag in question. If PREDICATES is NULL, the basic
1153 spec for that flag must be retrieved and must exist. If
1154 PREDICATES is not NULL, it is a string listing possible predicates
1155 for the spec entry; if an entry predicated on any of these is
1156 found, it is returned, otherwise NULL is returned. */
1158 static const format_flag_spec *
1159 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1162 for (i = 0; spec[i].flag_char != 0; i++)
1164 if (spec[i].flag_char != flag)
1166 if (predicates != NULL)
1168 if (spec[i].predicate != 0
1169 && strchr (predicates, spec[i].predicate) != 0)
1172 else if (spec[i].predicate == 0)
1175 gcc_assert (predicates);
1180 /* Check the argument list of a call to printf, scanf, etc.
1181 INFO points to the function_format_info structure.
1182 PARAMS is the list of argument values. */
1185 check_format_info (function_format_info *info, tree params)
1187 format_check_context format_ctx;
1188 unsigned HOST_WIDE_INT arg_num;
1190 format_check_results res;
1191 /* Skip to format argument. If the argument isn't available, there's
1192 no work for us to do; prototype checking will catch the problem. */
1193 for (arg_num = 1; ; ++arg_num)
1197 if (arg_num == info->format_num)
1199 params = TREE_CHAIN (params);
1201 format_tree = TREE_VALUE (params);
1202 params = TREE_CHAIN (params);
1203 if (format_tree == 0)
1206 res.number_non_literal = 0;
1207 res.number_extra_args = 0;
1208 res.number_dollar_extra_args = 0;
1209 res.number_wide = 0;
1210 res.number_empty = 0;
1211 res.number_unterminated = 0;
1212 res.number_other = 0;
1214 format_ctx.res = &res;
1215 format_ctx.info = info;
1216 format_ctx.params = params;
1218 check_function_arguments_recurse (check_format_arg, &format_ctx,
1219 format_tree, arg_num);
1221 if (res.number_non_literal > 0)
1223 /* Functions taking a va_list normally pass a non-literal format
1224 string. These functions typically are declared with
1225 first_arg_num == 0, so avoid warning in those cases. */
1226 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1228 /* For strftime-like formats, warn for not checking the format
1229 string; but there are no arguments to check. */
1230 warning (OPT_Wformat_nonliteral,
1231 "format not a string literal, format string not checked");
1233 else if (info->first_arg_num != 0)
1235 /* If there are no arguments for the format at all, we may have
1236 printf (foo) which is likely to be a security hole. */
1237 while (arg_num + 1 < info->first_arg_num)
1241 params = TREE_CHAIN (params);
1244 if (params == 0 && warn_format_security)
1245 warning (OPT_Wformat_security,
1246 "format not a string literal and no format arguments");
1247 else if (params == 0 && warn_format_nonliteral)
1248 warning (OPT_Wformat_nonliteral,
1249 "format not a string literal and no format arguments");
1251 warning (OPT_Wformat_nonliteral,
1252 "format not a string literal, argument types not checked");
1256 /* If there were extra arguments to the format, normally warn. However,
1257 the standard does say extra arguments are ignored, so in the specific
1258 case where we have multiple leaves (conditional expressions or
1259 ngettext) allow extra arguments if at least one leaf didn't have extra
1260 arguments, but was otherwise OK (either non-literal or checked OK).
1261 If the format is an empty string, this should be counted similarly to the
1262 case of extra format arguments. */
1263 if (res.number_extra_args > 0 && res.number_non_literal == 0
1264 && res.number_other == 0)
1265 warning (OPT_Wformat_extra_args, "too many arguments for format");
1266 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1267 && res.number_other == 0)
1268 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1269 if (res.number_empty > 0 && res.number_non_literal == 0
1270 && res.number_other == 0)
1271 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1272 format_types[info->format_type].name);
1274 if (res.number_wide > 0)
1275 warning (OPT_Wformat, "format is a wide character string");
1277 if (res.number_unterminated > 0)
1278 warning (OPT_Wformat, "unterminated format string");
1281 /* Callback from check_function_arguments_recurse to check a
1282 format string. FORMAT_TREE is the format parameter. ARG_NUM
1283 is the number of the format argument. CTX points to a
1284 format_check_context. */
1287 check_format_arg (void *ctx, tree format_tree,
1288 unsigned HOST_WIDE_INT arg_num)
1290 format_check_context *format_ctx = (format_check_context *) ctx;
1291 format_check_results *res = format_ctx->res;
1292 function_format_info *info = format_ctx->info;
1293 tree params = format_ctx->params;
1296 HOST_WIDE_INT offset;
1297 const char *format_chars;
1298 tree array_size = 0;
1300 alloc_pool fwt_pool;
1302 if (integer_zerop (format_tree))
1304 /* Skip to first argument to check, so we can see if this format
1305 has any arguments (it shouldn't). */
1306 while (arg_num + 1 < info->first_arg_num)
1310 params = TREE_CHAIN (params);
1315 res->number_other++;
1317 res->number_extra_args++;
1323 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1327 arg0 = TREE_OPERAND (format_tree, 0);
1328 arg1 = TREE_OPERAND (format_tree, 1);
1331 if (TREE_CODE (arg1) == INTEGER_CST)
1335 res->number_non_literal++;
1338 if (!host_integerp (arg1, 0)
1339 || (offset = tree_low_cst (arg1, 0)) < 0)
1341 res->number_non_literal++;
1345 if (TREE_CODE (format_tree) != ADDR_EXPR)
1347 res->number_non_literal++;
1350 format_tree = TREE_OPERAND (format_tree, 0);
1351 if (TREE_CODE (format_tree) == ARRAY_REF
1352 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1353 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1354 format_tree = TREE_OPERAND (format_tree, 0);
1355 if (TREE_CODE (format_tree) == VAR_DECL
1356 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1357 && (array_init = decl_constant_value (format_tree)) != format_tree
1358 && TREE_CODE (array_init) == STRING_CST)
1360 /* Extract the string constant initializer. Note that this may include
1361 a trailing NUL character that is not in the array (e.g.
1362 const char a[3] = "foo";). */
1363 array_size = DECL_SIZE_UNIT (format_tree);
1364 format_tree = array_init;
1366 if (TREE_CODE (format_tree) != STRING_CST)
1368 res->number_non_literal++;
1371 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1376 format_chars = TREE_STRING_POINTER (format_tree);
1377 format_length = TREE_STRING_LENGTH (format_tree);
1378 if (array_size != 0)
1380 /* Variable length arrays can't be initialized. */
1381 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1383 if (host_integerp (array_size, 0))
1385 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1386 if (array_size_value > 0
1387 && array_size_value == (int) array_size_value
1388 && format_length > array_size_value)
1389 format_length = array_size_value;
1394 if (offset >= format_length)
1396 res->number_non_literal++;
1399 format_chars += offset;
1400 format_length -= offset;
1402 if (format_length < 1 || format_chars[--format_length] != 0)
1404 res->number_unterminated++;
1407 if (format_length == 0)
1409 res->number_empty++;
1413 /* Skip to first argument to check. */
1414 while (arg_num + 1 < info->first_arg_num)
1418 params = TREE_CHAIN (params);
1421 /* Provisionally increment res->number_other; check_format_info_main
1422 will decrement it if it finds there are extra arguments, but this way
1423 need not adjust it for every return. */
1424 res->number_other++;
1425 fwt_pool = create_alloc_pool ("format_wanted_type pool",
1426 sizeof (format_wanted_type), 10);
1427 check_format_info_main (res, info, format_chars, format_length,
1428 params, arg_num, fwt_pool);
1429 free_alloc_pool (fwt_pool);
1433 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1434 is the NUL-terminated format string (which at this point may contain
1435 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1436 terminating NUL character). ARG_NUM is one less than the number of
1437 the first format argument to check; PARAMS points to that format
1438 argument in the list of arguments. */
1441 check_format_info_main (format_check_results *res,
1442 function_format_info *info, const char *format_chars,
1443 int format_length, tree params,
1444 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool)
1446 const char *orig_format_chars = format_chars;
1447 tree first_fillin_param = params;
1449 const format_kind_info *fki = &format_types[info->format_type];
1450 const format_flag_spec *flag_specs = fki->flag_specs;
1451 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1453 /* -1 if no conversions taking an operand have been found; 0 if one has
1454 and it didn't use $; 1 if $ formats are in use. */
1455 int has_operand_number = -1;
1457 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1462 int suppressed = FALSE;
1463 const char *length_chars = NULL;
1464 enum format_lengths length_chars_val = FMT_LEN_none;
1465 enum format_std_version length_chars_std = STD_C89;
1469 int main_arg_num = 0;
1470 tree main_arg_params = 0;
1471 enum format_std_version wanted_type_std;
1472 const char *wanted_type_name;
1473 format_wanted_type width_wanted_type;
1474 format_wanted_type precision_wanted_type;
1475 format_wanted_type main_wanted_type;
1476 format_wanted_type *first_wanted_type = NULL;
1477 format_wanted_type *last_wanted_type = NULL;
1478 const format_length_info *fli = NULL;
1479 const format_char_info *fci = NULL;
1480 char flag_chars[256];
1482 const char *format_start = format_chars;
1483 if (*format_chars == 0)
1485 if (format_chars - orig_format_chars != format_length)
1486 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
1487 if (info->first_arg_num != 0 && params != 0
1488 && has_operand_number <= 0)
1490 res->number_other--;
1491 res->number_extra_args++;
1493 if (has_operand_number > 0)
1494 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1497 if (*format_chars++ != '%')
1499 if (*format_chars == 0)
1501 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1504 if (*format_chars == '%')
1511 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1513 /* Possibly read a $ operand number at the start of the format.
1514 If one was previously used, one is required here. If one
1515 is not used here, we can't immediately conclude this is a
1516 format without them, since it could be printf %m or scanf %*. */
1518 opnum = maybe_read_dollar_number (&format_chars, 0,
1520 &main_arg_params, fki);
1525 has_operand_number = 1;
1526 main_arg_num = opnum + info->first_arg_num - 1;
1529 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1531 if (avoid_dollar_number (format_chars))
1535 /* Read any format flags, but do not yet validate them beyond removing
1536 duplicates, since in general validation depends on the rest of
1538 while (*format_chars != 0
1539 && strchr (fki->flag_chars, *format_chars) != 0)
1541 const format_flag_spec *s = get_flag_spec (flag_specs,
1542 *format_chars, NULL);
1543 if (strchr (flag_chars, *format_chars) != 0)
1545 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1549 i = strlen (flag_chars);
1550 flag_chars[i++] = *format_chars;
1553 if (s->skip_next_char)
1556 if (*format_chars == 0)
1558 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1565 /* Read any format width, possibly * or *m$. */
1566 if (fki->width_char != 0)
1568 if (fki->width_type != NULL && *format_chars == '*')
1570 i = strlen (flag_chars);
1571 flag_chars[i++] = fki->width_char;
1573 /* "...a field width...may be indicated by an asterisk.
1574 In this case, an int argument supplies the field width..." */
1576 if (has_operand_number != 0)
1579 opnum = maybe_read_dollar_number (&format_chars,
1580 has_operand_number == 1,
1587 has_operand_number = 1;
1588 arg_num = opnum + info->first_arg_num - 1;
1591 has_operand_number = 0;
1595 if (avoid_dollar_number (format_chars))
1598 if (info->first_arg_num != 0)
1602 warning (OPT_Wformat, "too few arguments for format");
1605 cur_param = TREE_VALUE (params);
1606 if (has_operand_number <= 0)
1608 params = TREE_CHAIN (params);
1611 width_wanted_type.wanted_type = *fki->width_type;
1612 width_wanted_type.wanted_type_name = NULL;
1613 width_wanted_type.pointer_count = 0;
1614 width_wanted_type.char_lenient_flag = 0;
1615 width_wanted_type.writing_in_flag = 0;
1616 width_wanted_type.reading_from_flag = 0;
1617 width_wanted_type.name = _("field width");
1618 width_wanted_type.param = cur_param;
1619 width_wanted_type.arg_num = arg_num;
1620 width_wanted_type.next = NULL;
1621 if (last_wanted_type != 0)
1622 last_wanted_type->next = &width_wanted_type;
1623 if (first_wanted_type == 0)
1624 first_wanted_type = &width_wanted_type;
1625 last_wanted_type = &width_wanted_type;
1630 /* Possibly read a numeric width. If the width is zero,
1631 we complain if appropriate. */
1632 int non_zero_width_char = FALSE;
1633 int found_width = FALSE;
1634 while (ISDIGIT (*format_chars))
1637 if (*format_chars != '0')
1638 non_zero_width_char = TRUE;
1641 if (found_width && !non_zero_width_char &&
1642 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1643 warning (OPT_Wformat, "zero width in %s format", fki->name);
1646 i = strlen (flag_chars);
1647 flag_chars[i++] = fki->width_char;
1653 /* Read any format left precision (must be a number, not *). */
1654 if (fki->left_precision_char != 0 && *format_chars == '#')
1657 i = strlen (flag_chars);
1658 flag_chars[i++] = fki->left_precision_char;
1660 if (!ISDIGIT (*format_chars))
1661 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1662 while (ISDIGIT (*format_chars))
1666 /* Read any format precision, possibly * or *m$. */
1667 if (fki->precision_char != 0 && *format_chars == '.')
1670 i = strlen (flag_chars);
1671 flag_chars[i++] = fki->precision_char;
1673 if (fki->precision_type != NULL && *format_chars == '*')
1675 /* "...a...precision...may be indicated by an asterisk.
1676 In this case, an int argument supplies the...precision." */
1678 if (has_operand_number != 0)
1681 opnum = maybe_read_dollar_number (&format_chars,
1682 has_operand_number == 1,
1689 has_operand_number = 1;
1690 arg_num = opnum + info->first_arg_num - 1;
1693 has_operand_number = 0;
1697 if (avoid_dollar_number (format_chars))
1700 if (info->first_arg_num != 0)
1704 warning (OPT_Wformat, "too few arguments for format");
1707 cur_param = TREE_VALUE (params);
1708 if (has_operand_number <= 0)
1710 params = TREE_CHAIN (params);
1713 precision_wanted_type.wanted_type = *fki->precision_type;
1714 precision_wanted_type.wanted_type_name = NULL;
1715 precision_wanted_type.pointer_count = 0;
1716 precision_wanted_type.char_lenient_flag = 0;
1717 precision_wanted_type.writing_in_flag = 0;
1718 precision_wanted_type.reading_from_flag = 0;
1719 precision_wanted_type.name = _("field precision");
1720 precision_wanted_type.param = cur_param;
1721 precision_wanted_type.arg_num = arg_num;
1722 precision_wanted_type.next = NULL;
1723 if (last_wanted_type != 0)
1724 last_wanted_type->next = &precision_wanted_type;
1725 if (first_wanted_type == 0)
1726 first_wanted_type = &precision_wanted_type;
1727 last_wanted_type = &precision_wanted_type;
1732 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1733 && !ISDIGIT (*format_chars))
1734 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1735 while (ISDIGIT (*format_chars))
1740 if (fki->alloc_char && fki->alloc_char == *format_chars)
1742 i = strlen (flag_chars);
1743 flag_chars[i++] = fki->alloc_char;
1748 /* Handle the scanf allocation kludge. */
1749 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1751 if (*format_chars == 'a' && !flag_isoc99)
1753 if (format_chars[1] == 's' || format_chars[1] == 'S'
1754 || format_chars[1] == '[')
1756 /* 'a' is used as a flag. */
1757 i = strlen (flag_chars);
1758 flag_chars[i++] = 'a';
1765 /* Read any length modifier, if this kind of format has them. */
1766 fli = fki->length_char_specs;
1767 length_chars = NULL;
1768 length_chars_val = FMT_LEN_none;
1769 length_chars_std = STD_C89;
1772 while (fli->name != 0
1773 && strncmp (fli->name, format_chars, strlen (fli->name)))
1777 format_chars += strlen (fli->name);
1778 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1781 length_chars = fli->double_name;
1782 length_chars_val = fli->double_index;
1783 length_chars_std = fli->double_std;
1787 length_chars = fli->name;
1788 length_chars_val = fli->index;
1789 length_chars_std = fli->std;
1791 i = strlen (flag_chars);
1792 flag_chars[i++] = fki->length_code_char;
1797 /* Warn if the length modifier is non-standard. */
1798 if (ADJ_STD (length_chars_std) > C_STD_VER)
1799 warning (OPT_Wformat,
1800 "%s does not support the %qs %s length modifier",
1801 C_STD_NAME (length_chars_std), length_chars,
1806 /* Read any modifier (strftime E/O). */
1807 if (fki->modifier_chars != NULL)
1809 while (*format_chars != 0
1810 && strchr (fki->modifier_chars, *format_chars) != 0)
1812 if (strchr (flag_chars, *format_chars) != 0)
1814 const format_flag_spec *s = get_flag_spec (flag_specs,
1815 *format_chars, NULL);
1816 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1820 i = strlen (flag_chars);
1821 flag_chars[i++] = *format_chars;
1828 format_char = *format_chars;
1829 if (format_char == 0
1830 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1831 && format_char == '%'))
1833 warning (OPT_Wformat, "conversion lacks type at end of format");
1837 fci = fki->conversion_specs;
1838 while (fci->format_chars != 0
1839 && strchr (fci->format_chars, format_char) == 0)
1841 if (fci->format_chars == 0)
1843 if (ISGRAPH (format_char))
1844 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1847 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1853 if (ADJ_STD (fci->std) > C_STD_VER)
1854 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1855 C_STD_NAME (fci->std), format_char, fki->name);
1858 /* Validate the individual flags used, removing any that are invalid. */
1861 for (i = 0; flag_chars[i] != 0; i++)
1863 const format_flag_spec *s = get_flag_spec (flag_specs,
1864 flag_chars[i], NULL);
1865 flag_chars[i - d] = flag_chars[i];
1866 if (flag_chars[i] == fki->length_code_char)
1868 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1870 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1871 _(s->name), format_char, fki->name);
1877 const format_flag_spec *t;
1878 if (ADJ_STD (s->std) > C_STD_VER)
1879 warning (OPT_Wformat, "%s does not support %s",
1880 C_STD_NAME (s->std), _(s->long_name));
1881 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1882 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1884 const char *long_name = (t->long_name != NULL
1887 if (ADJ_STD (t->std) > C_STD_VER)
1888 warning (OPT_Wformat,
1889 "%s does not support %s with the %<%%%c%> %s format",
1890 C_STD_NAME (t->std), _(long_name),
1891 format_char, fki->name);
1895 flag_chars[i - d] = 0;
1898 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1899 && strchr (flag_chars, 'a') != 0)
1901 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0)
1904 if (fki->suppression_char
1905 && strchr (flag_chars, fki->suppression_char) != 0)
1908 /* Validate the pairs of flags used. */
1909 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1911 const format_flag_spec *s, *t;
1912 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1914 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1916 if (bad_flag_pairs[i].predicate != 0
1917 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1919 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1920 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1921 if (bad_flag_pairs[i].ignored)
1923 if (bad_flag_pairs[i].predicate != 0)
1924 warning (OPT_Wformat,
1925 "%s ignored with %s and %<%%%c%> %s format",
1926 _(s->name), _(t->name), format_char,
1929 warning (OPT_Wformat, "%s ignored with %s in %s format",
1930 _(s->name), _(t->name), fki->name);
1934 if (bad_flag_pairs[i].predicate != 0)
1935 warning (OPT_Wformat,
1936 "use of %s and %s together with %<%%%c%> %s format",
1937 _(s->name), _(t->name), format_char,
1940 warning (OPT_Wformat, "use of %s and %s together in %s format",
1941 _(s->name), _(t->name), fki->name);
1945 /* Give Y2K warnings. */
1946 if (warn_format_y2k)
1949 if (strchr (fci->flags2, '4') != 0)
1950 if (strchr (flag_chars, 'E') != 0)
1954 else if (strchr (fci->flags2, '3') != 0)
1956 else if (strchr (fci->flags2, '2') != 0)
1959 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1960 "year in some locales", format_char);
1961 else if (y2k_level == 2)
1962 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1963 "year", format_char);
1966 if (strchr (fci->flags2, '[') != 0)
1968 /* Skip over scan set, in case it happens to have '%' in it. */
1969 if (*format_chars == '^')
1971 /* Find closing bracket; if one is hit immediately, then
1972 it's part of the scan set rather than a terminator. */
1973 if (*format_chars == ']')
1975 while (*format_chars && *format_chars != ']')
1977 if (*format_chars != ']')
1978 /* The end of the format string was reached. */
1979 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
1983 wanted_type_name = 0;
1984 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
1986 wanted_type = (fci->types[length_chars_val].type
1987 ? *fci->types[length_chars_val].type : 0);
1988 wanted_type_name = fci->types[length_chars_val].name;
1989 wanted_type_std = fci->types[length_chars_val].std;
1990 if (wanted_type == 0)
1992 warning (OPT_Wformat,
1993 "use of %qs length modifier with %qc type character",
1994 length_chars, format_char);
1995 /* Heuristic: skip one argument when an invalid length/type
1996 combination is encountered. */
2000 warning (OPT_Wformat, "too few arguments for format");
2003 params = TREE_CHAIN (params);
2007 /* Warn if non-standard, provided it is more non-standard
2008 than the length and type characters that may already
2009 have been warned for. */
2010 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2011 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2013 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2014 warning (OPT_Wformat,
2015 "%s does not support the %<%%%s%c%> %s format",
2016 C_STD_NAME (wanted_type_std), length_chars,
2017 format_char, fki->name);
2021 main_wanted_type.next = NULL;
2023 /* Finally. . .check type of argument against desired type! */
2024 if (info->first_arg_num == 0)
2026 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2029 if (main_arg_num != 0)
2032 warning (OPT_Wformat, "operand number specified with "
2033 "suppressed assignment");
2035 warning (OPT_Wformat, "operand number specified for format "
2036 "taking no argument");
2041 format_wanted_type *wanted_type_ptr;
2043 if (main_arg_num != 0)
2045 arg_num = main_arg_num;
2046 params = main_arg_params;
2051 if (has_operand_number > 0)
2053 warning (OPT_Wformat, "missing $ operand number in format");
2057 has_operand_number = 0;
2060 wanted_type_ptr = &main_wanted_type;
2065 warning (OPT_Wformat, "too few arguments for format");
2069 cur_param = TREE_VALUE (params);
2070 params = TREE_CHAIN (params);
2072 wanted_type_ptr->wanted_type = wanted_type;
2073 wanted_type_ptr->wanted_type_name = wanted_type_name;
2074 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2075 wanted_type_ptr->char_lenient_flag = 0;
2076 if (strchr (fci->flags2, 'c') != 0)
2077 wanted_type_ptr->char_lenient_flag = 1;
2078 wanted_type_ptr->writing_in_flag = 0;
2079 wanted_type_ptr->reading_from_flag = 0;
2081 wanted_type_ptr->writing_in_flag = 1;
2084 if (strchr (fci->flags2, 'W') != 0)
2085 wanted_type_ptr->writing_in_flag = 1;
2086 if (strchr (fci->flags2, 'R') != 0)
2087 wanted_type_ptr->reading_from_flag = 1;
2089 wanted_type_ptr->name = NULL;
2090 wanted_type_ptr->param = cur_param;
2091 wanted_type_ptr->arg_num = arg_num;
2092 wanted_type_ptr->next = NULL;
2093 if (last_wanted_type != 0)
2094 last_wanted_type->next = wanted_type_ptr;
2095 if (first_wanted_type == 0)
2096 first_wanted_type = wanted_type_ptr;
2097 last_wanted_type = wanted_type_ptr;
2102 wanted_type_ptr = (format_wanted_type *)
2103 pool_alloc (fwt_pool);
2105 wanted_type = *fci->types[length_chars_val].type;
2106 wanted_type_name = fci->types[length_chars_val].name;
2111 if (first_wanted_type != 0)
2112 check_format_types (first_wanted_type, format_start,
2113 format_chars - format_start);
2118 /* Check the argument types from a single format conversion (possibly
2119 including width and precision arguments). */
2121 check_format_types (format_wanted_type *types, const char *format_start,
2124 for (; types != 0; types = types->next)
2133 cur_param = types->param;
2134 cur_type = TREE_TYPE (cur_param);
2135 if (cur_type == error_mark_node)
2137 orig_cur_type = cur_type;
2139 wanted_type = types->wanted_type;
2140 arg_num = types->arg_num;
2142 /* The following should not occur here. */
2143 gcc_assert (wanted_type);
2144 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2146 if (types->pointer_count == 0)
2147 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2149 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2151 STRIP_NOPS (cur_param);
2153 /* Check the types of any additional pointer arguments
2154 that precede the "real" argument. */
2155 for (i = 0; i < types->pointer_count; ++i)
2157 if (TREE_CODE (cur_type) == POINTER_TYPE)
2159 cur_type = TREE_TYPE (cur_type);
2160 if (cur_type == error_mark_node)
2163 /* Check for writing through a NULL pointer. */
2164 if (types->writing_in_flag
2167 && integer_zerop (cur_param))
2168 warning (OPT_Wformat, "writing through null pointer "
2169 "(argument %d)", arg_num);
2171 /* Check for reading through a NULL pointer. */
2172 if (types->reading_from_flag
2175 && integer_zerop (cur_param))
2176 warning (OPT_Wformat, "reading through null pointer "
2177 "(argument %d)", arg_num);
2179 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2180 cur_param = TREE_OPERAND (cur_param, 0);
2184 /* See if this is an attempt to write into a const type with
2185 scanf or with printf "%n". Note: the writing in happens
2186 at the first indirection only, if for example
2187 void * const * is passed to scanf %p; passing
2188 const void ** is simply passing an incompatible type. */
2189 if (types->writing_in_flag
2191 && (TYPE_READONLY (cur_type)
2193 && (CONSTANT_CLASS_P (cur_param)
2194 || (DECL_P (cur_param)
2195 && TREE_READONLY (cur_param))))))
2196 warning (OPT_Wformat, "writing into constant object "
2197 "(argument %d)", arg_num);
2199 /* If there are extra type qualifiers beyond the first
2200 indirection, then this makes the types technically
2204 && (TYPE_READONLY (cur_type)
2205 || TYPE_VOLATILE (cur_type)
2206 || TYPE_RESTRICT (cur_type)))
2207 warning (OPT_Wformat, "extra type qualifiers in format "
2208 "argument (argument %d)",
2214 format_type_warning (types->name, format_start, format_length,
2215 wanted_type, types->pointer_count,
2216 types->wanted_type_name, orig_cur_type,
2222 if (i < types->pointer_count)
2225 cur_type = TYPE_MAIN_VARIANT (cur_type);
2227 /* Check whether the argument type is a character type. This leniency
2228 only applies to certain formats, flagged with 'c'.
2230 if (types->char_lenient_flag)
2231 char_type_flag = (cur_type == char_type_node
2232 || cur_type == signed_char_type_node
2233 || cur_type == unsigned_char_type_node);
2235 /* Check the type of the "real" argument, if there's a type we want. */
2236 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2238 /* If we want 'void *', allow any pointer type.
2239 (Anything else would already have got a warning.)
2240 With -pedantic, only allow pointers to void and to character
2242 if (wanted_type == void_type_node
2243 && (!pedantic || (i == 1 && char_type_flag)))
2245 /* Don't warn about differences merely in signedness, unless
2246 -pedantic. With -pedantic, warn if the type is a pointer
2247 target and not a character type, and for character types at
2248 a second level of indirection. */
2249 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2250 && TREE_CODE (cur_type) == INTEGER_TYPE
2251 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2252 && (TYPE_UNSIGNED (wanted_type)
2253 ? wanted_type == c_common_unsigned_type (cur_type)
2254 : wanted_type == c_common_signed_type (cur_type)))
2256 /* Likewise, "signed char", "unsigned char" and "char" are
2257 equivalent but the above test won't consider them equivalent. */
2258 if (wanted_type == char_type_node
2259 && (!pedantic || i < 2)
2262 /* Now we have a type mismatch. */
2263 format_type_warning (types->name, format_start, format_length,
2264 wanted_type, types->pointer_count,
2265 types->wanted_type_name, orig_cur_type, arg_num);
2270 /* Give a warning about a format argument of different type from that
2271 expected. DESCR is a description such as "field precision", or
2272 NULL for an ordinary format. For an ordinary format, FORMAT_START
2273 points to where the format starts in the format string and
2274 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2275 should have after POINTER_COUNT pointer dereferences.
2276 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2277 or NULL if the ordinary name of the type should be used. ARG_TYPE
2278 is the type of the actual argument. ARG_NUM is the number of that
2281 format_type_warning (const char *descr, const char *format_start,
2282 int format_length, tree wanted_type, int pointer_count,
2283 const char *wanted_type_name, tree arg_type, int arg_num)
2286 /* If ARG_TYPE is a typedef with a misleading name (for example,
2287 size_t but not the standard size_t expected by printf %zu), avoid
2288 printing the typedef name. */
2289 if (wanted_type_name
2290 && TYPE_NAME (arg_type)
2291 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2292 && DECL_NAME (TYPE_NAME (arg_type))
2293 && !strcmp (wanted_type_name,
2294 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2295 arg_type = TYPE_MAIN_VARIANT (arg_type);
2296 /* The format type and name exclude any '*' for pointers, so those
2297 must be formatted manually. For all the types we currently have,
2298 this is adequate, but formats taking pointers to functions or
2299 arrays would require the full type to be built up in order to
2300 print it with %T. */
2301 p = (char *) alloca (pointer_count + 2);
2302 if (pointer_count == 0)
2304 else if (c_dialect_cxx ())
2306 memset (p, '*', pointer_count);
2307 p[pointer_count] = 0;
2312 memset (p + 1, '*', pointer_count);
2313 p[pointer_count + 1] = 0;
2315 if (wanted_type_name)
2318 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2319 "but argument %d has type %qT",
2320 descr, wanted_type_name, p, arg_num, arg_type);
2322 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2323 "but argument %d has type %qT",
2324 format_length, format_start, wanted_type_name, p,
2330 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2331 "but argument %d has type %qT",
2332 descr, wanted_type, p, arg_num, arg_type);
2334 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2335 "but argument %d has type %qT",
2336 format_length, format_start, wanted_type, p, arg_num, arg_type);
2341 /* Given a format_char_info array FCI, and a character C, this function
2342 returns the index into the conversion_specs where that specifier's
2343 data is located. The character must exist. */
2345 find_char_info_specifier_index (const format_char_info *fci, int c)
2349 for (i = 0; fci->format_chars; i++, fci++)
2350 if (strchr (fci->format_chars, c))
2353 /* We shouldn't be looking for a non-existent specifier. */
2357 /* Given a format_length_info array FLI, and a character C, this
2358 function returns the index into the conversion_specs where that
2359 modifier's data is located. The character must exist. */
2361 find_length_info_modifier_index (const format_length_info *fli, int c)
2365 for (i = 0; fli->name; i++, fli++)
2366 if (strchr (fli->name, c))
2369 /* We shouldn't be looking for a non-existent modifier. */
2373 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2374 use in GCC's __asm_fprintf__ custom format attribute. You must
2375 have set dynamic_format_types before calling this function. */
2377 init_dynamic_asm_fprintf_info (void)
2383 format_length_info *new_asm_fprintf_length_specs;
2386 /* Find the underlying type for HOST_WIDE_INT. For the %w
2387 length modifier to work, one must have issued: "typedef
2388 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2389 prior to using that modifier. */
2390 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2393 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2396 hwi = identifier_global_value (hwi);
2397 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2399 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2402 hwi = DECL_ORIGINAL_TYPE (hwi);
2404 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2406 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2407 " or %<long long%>");
2411 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2412 new_asm_fprintf_length_specs = (format_length_info *)
2413 xmemdup (asm_fprintf_length_specs,
2414 sizeof (asm_fprintf_length_specs),
2415 sizeof (asm_fprintf_length_specs));
2417 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2418 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2419 if (hwi == long_integer_type_node)
2420 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2421 else if (hwi == long_long_integer_type_node)
2422 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2426 /* Assign the new data for use. */
2427 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2428 new_asm_fprintf_length_specs;
2432 /* Determine the type of a "locus" in the code being compiled for use
2433 in GCC's __gcc_gfc__ custom format attribute. You must have set
2434 dynamic_format_types before calling this function. */
2436 init_dynamic_gfc_info (void)
2442 static format_char_info *gfc_fci;
2444 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2445 must have declared 'locus' prior to using this attribute. If
2446 we haven't seen this declarations then you shouldn't use the
2447 specifier requiring that type. */
2448 if ((locus = maybe_get_identifier ("locus")))
2450 locus = identifier_global_value (locus);
2453 if (TREE_CODE (locus) != TYPE_DECL
2454 || TREE_TYPE (locus) == error_mark_node)
2456 error ("%<locus%> is not defined as a type");
2460 locus = TREE_TYPE (locus);
2464 /* Assign the new data for use. */
2466 /* Handle the __gcc_gfc__ format specifics. */
2468 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2469 gfc_fci = (format_char_info *)
2470 xmemdup (gcc_gfc_char_table,
2471 sizeof (gcc_gfc_char_table),
2472 sizeof (gcc_gfc_char_table));
2475 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2476 gfc_fci[i].types[0].type = &locus;
2477 gfc_fci[i].pointer_count = 1;
2482 /* Determine the types of "tree" and "location_t" in the code being
2483 compiled for use in GCC's diagnostic custom format attributes. You
2484 must have set dynamic_format_types before calling this function. */
2486 init_dynamic_diag_info (void)
2488 static tree t, loc, hwi;
2490 if (!loc || !t || !hwi)
2492 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2493 static format_length_info *diag_ls;
2496 /* For the GCC-diagnostics custom format specifiers to work, one
2497 must have declared 'tree' and/or 'location_t' prior to using
2498 those attributes. If we haven't seen these declarations then
2499 you shouldn't use the specifiers requiring these types.
2500 However we don't force a hard ICE because we may see only one
2501 or the other type. */
2502 if ((loc = maybe_get_identifier ("location_t")))
2504 loc = identifier_global_value (loc);
2507 if (TREE_CODE (loc) != TYPE_DECL)
2509 error ("%<location_t%> is not defined as a type");
2513 loc = TREE_TYPE (loc);
2517 /* We need to grab the underlying 'union tree_node' so peek into
2518 an extra type level. */
2519 if ((t = maybe_get_identifier ("tree")))
2521 t = identifier_global_value (t);
2524 if (TREE_CODE (t) != TYPE_DECL)
2526 error ("%<tree%> is not defined as a type");
2529 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2531 error ("%<tree%> is not defined as a pointer type");
2535 t = TREE_TYPE (TREE_TYPE (t));
2539 /* Find the underlying type for HOST_WIDE_INT. For the %w
2540 length modifier to work, one must have issued: "typedef
2541 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2542 prior to using that modifier. */
2543 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2545 hwi = identifier_global_value (hwi);
2548 if (TREE_CODE (hwi) != TYPE_DECL)
2550 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2555 hwi = DECL_ORIGINAL_TYPE (hwi);
2557 if (hwi != long_integer_type_node
2558 && hwi != long_long_integer_type_node)
2560 error ("%<__gcc_host_wide_int__%> is not defined"
2561 " as %<long%> or %<long long%>");
2568 /* Assign the new data for use. */
2570 /* All the GCC diag formats use the same length specs. */
2572 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2573 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2574 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2575 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2576 diag_ls = (format_length_info *)
2577 xmemdup (gcc_diag_length_specs,
2578 sizeof (gcc_diag_length_specs),
2579 sizeof (gcc_diag_length_specs));
2582 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2583 i = find_length_info_modifier_index (diag_ls, 'w');
2584 if (hwi == long_integer_type_node)
2585 diag_ls[i].index = FMT_LEN_l;
2586 else if (hwi == long_long_integer_type_node)
2587 diag_ls[i].index = FMT_LEN_ll;
2592 /* Handle the __gcc_diag__ format specifics. */
2594 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2595 diag_fci = (format_char_info *)
2596 xmemdup (gcc_diag_char_table,
2597 sizeof (gcc_diag_char_table),
2598 sizeof (gcc_diag_char_table));
2601 i = find_char_info_specifier_index (diag_fci, 'K');
2602 diag_fci[i].types[0].type = &t;
2603 diag_fci[i].pointer_count = 1;
2606 /* Handle the __gcc_tdiag__ format specifics. */
2608 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2609 tdiag_fci = (format_char_info *)
2610 xmemdup (gcc_tdiag_char_table,
2611 sizeof (gcc_tdiag_char_table),
2612 sizeof (gcc_tdiag_char_table));
2615 /* All specifiers taking a tree share the same struct. */
2616 i = find_char_info_specifier_index (tdiag_fci, 'D');
2617 tdiag_fci[i].types[0].type = &t;
2618 tdiag_fci[i].pointer_count = 1;
2619 i = find_char_info_specifier_index (tdiag_fci, 'K');
2620 tdiag_fci[i].types[0].type = &t;
2621 tdiag_fci[i].pointer_count = 1;
2624 /* Handle the __gcc_cdiag__ format specifics. */
2626 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2627 cdiag_fci = (format_char_info *)
2628 xmemdup (gcc_cdiag_char_table,
2629 sizeof (gcc_cdiag_char_table),
2630 sizeof (gcc_cdiag_char_table));
2633 /* All specifiers taking a tree share the same struct. */
2634 i = find_char_info_specifier_index (cdiag_fci, 'D');
2635 cdiag_fci[i].types[0].type = &t;
2636 cdiag_fci[i].pointer_count = 1;
2637 i = find_char_info_specifier_index (cdiag_fci, 'K');
2638 cdiag_fci[i].types[0].type = &t;
2639 cdiag_fci[i].pointer_count = 1;
2642 /* Handle the __gcc_cxxdiag__ format specifics. */
2644 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2645 cxxdiag_fci = (format_char_info *)
2646 xmemdup (gcc_cxxdiag_char_table,
2647 sizeof (gcc_cxxdiag_char_table),
2648 sizeof (gcc_cxxdiag_char_table));
2651 /* All specifiers taking a tree share the same struct. */
2652 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2653 cxxdiag_fci[i].types[0].type = &t;
2654 cxxdiag_fci[i].pointer_count = 1;
2655 i = find_char_info_specifier_index (cxxdiag_fci, 'K');
2656 cxxdiag_fci[i].types[0].type = &t;
2657 cxxdiag_fci[i].pointer_count = 1;
2662 #ifdef TARGET_FORMAT_TYPES
2663 extern const format_kind_info TARGET_FORMAT_TYPES[];
2666 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2667 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
2669 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2670 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
2673 /* Attributes such as "printf" are equivalent to those such as
2674 "gnu_printf" unless this is overridden by a target. */
2675 static const target_ovr_attr gnu_target_overrides_format_attributes[] =
2677 { "gnu_printf", "printf" },
2678 { "gnu_scanf", "scanf" },
2679 { "gnu_strftime", "strftime" },
2680 { "gnu_strfmon", "strfmon" },
2684 /* Translate to unified attribute name. This is used in decode_format_type and
2685 decode_format_attr. In attr_name the user specified argument is passed. It
2686 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2687 or the attr_name passed to this function, if there is no matching entry. */
2689 convert_format_name_to_system_name (const char *attr_name)
2693 if (attr_name == NULL || *attr_name == 0
2694 || strncmp (attr_name, "gcc_", 4) == 0)
2696 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2697 TARGET_OVERRIDES_FORMAT_INIT ();
2700 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2701 /* Check if format attribute is overridden by target. */
2702 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
2703 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
2705 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
2707 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
2710 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
2712 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
2716 /* Otherwise default to gnu format. */
2718 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
2721 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
2724 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
2726 return gnu_target_overrides_format_attributes[i].named_attr_src;
2732 /* Return true if TATTR_NAME and ATTR_NAME are the same format attribute,
2733 counting "name" and "__name__" as the same, false otherwise. */
2735 cmp_attribs (const char *tattr_name, const char *attr_name)
2737 int alen = strlen (attr_name);
2738 int slen = (tattr_name ? strlen (tattr_name) : 0);
2739 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_'
2740 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_')
2745 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0)
2750 /* Handle a "format" attribute; arguments as in
2751 struct attribute_spec.handler. */
2753 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2754 int flags, bool *no_add_attrs)
2757 function_format_info info;
2760 #ifdef TARGET_FORMAT_TYPES
2761 /* If the target provides additional format types, we need to
2762 add them to FORMAT_TYPES at first use. */
2763 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2765 dynamic_format_types = XNEWVEC (format_kind_info,
2766 n_format_types + TARGET_N_FORMAT_TYPES);
2767 memcpy (dynamic_format_types, format_types_orig,
2768 sizeof (format_types_orig));
2769 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2770 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2772 format_types = dynamic_format_types;
2773 n_format_types += TARGET_N_FORMAT_TYPES;
2777 if (!decode_format_attr (args, &info, 0))
2779 *no_add_attrs = true;
2783 argument = TYPE_ARG_TYPES (type);
2786 if (!check_format_string (argument, info.format_num, flags,
2790 if (info.first_arg_num != 0)
2792 unsigned HOST_WIDE_INT arg_num = 1;
2794 /* Verify that first_arg_num points to the last arg,
2797 arg_num++, argument = TREE_CHAIN (argument);
2799 if (arg_num != info.first_arg_num)
2801 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2802 error ("args to be formatted is not %<...%>");
2803 *no_add_attrs = true;
2809 /* Check if this is a strftime variant. Just for this variant
2810 FMT_FLAG_ARG_CONVERT is not set. */
2811 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
2812 && info.first_arg_num != 0)
2814 error ("strftime formats cannot format arguments");
2815 *no_add_attrs = true;
2819 /* If this is a custom GCC-internal format type, we have to
2820 initialize certain bits at runtime. */
2821 if (info.format_type == asm_fprintf_format_type
2822 || info.format_type == gcc_gfc_format_type
2823 || info.format_type == gcc_diag_format_type
2824 || info.format_type == gcc_tdiag_format_type
2825 || info.format_type == gcc_cdiag_format_type
2826 || info.format_type == gcc_cxxdiag_format_type)
2828 /* Our first time through, we have to make sure that our
2829 format_type data is allocated dynamically and is modifiable. */
2830 if (!dynamic_format_types)
2831 format_types = dynamic_format_types = (format_kind_info *)
2832 xmemdup (format_types_orig, sizeof (format_types_orig),
2833 sizeof (format_types_orig));
2835 /* If this is format __asm_fprintf__, we have to initialize
2836 GCC's notion of HOST_WIDE_INT for checking %wd. */
2837 if (info.format_type == asm_fprintf_format_type)
2838 init_dynamic_asm_fprintf_info ();
2839 /* If this is format __gcc_gfc__, we have to initialize GCC's
2840 notion of 'locus' at runtime for %L. */
2841 else if (info.format_type == gcc_gfc_format_type)
2842 init_dynamic_gfc_info ();
2843 /* If this is one of the diagnostic attributes, then we have to
2844 initialize 'location_t' and 'tree' at runtime. */
2845 else if (info.format_type == gcc_diag_format_type
2846 || info.format_type == gcc_tdiag_format_type
2847 || info.format_type == gcc_cdiag_format_type
2848 || info.format_type == gcc_cxxdiag_format_type)
2849 init_dynamic_diag_info ();