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[] =
508 static const format_char_info dfly_ext_char_info =
509 { NULL, 1, STD_EXT, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL };
511 static const format_char_info print_char_table[] =
513 /* C89 conversion specifiers. */
514 { "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 },
515 { "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 },
516 { "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 },
517 { "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 },
518 { "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 },
519 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
520 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
521 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
522 { "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 },
523 /* C99 conversion specifiers. */
524 { "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 },
525 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
526 /* X/Open conversion specifiers. */
527 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
528 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
529 /* GNU conversion specifiers. */
530 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
531 /* BSD conversion specifiers. */
532 /* DragonFly kernel extensions (src/sys/kern/subr_prf.c).
533 The format %b is supported to decode error registers.
534 Its usage is: printf("reg=%b\n", regval, "<base><arg>*");
535 which produces: reg=3<BITTWO,BITONE>
537 { "b", 0, STD_EXT, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", &dfly_ext_char_info },
538 { "ry", 0, STD_EXT, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "i", NULL },
539 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
542 static const format_char_info asm_fprintf_char_table[] =
544 /* C89 conversion specifiers. */
545 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
546 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
547 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
548 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
549 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
551 /* asm_fprintf conversion specifiers. */
552 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
553 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
554 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
555 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
556 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
557 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
558 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
559 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
562 static const format_char_info gcc_diag_char_table[] =
564 /* C89 conversion specifiers. */
565 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
566 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
567 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
568 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
569 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
570 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
572 /* Custom conversion specifiers. */
574 /* %H will require "location_t" at runtime. */
575 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
577 /* These will require a "tree" at runtime. */
578 { "JK", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
580 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
581 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
582 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
585 static const format_char_info gcc_tdiag_char_table[] =
587 /* C89 conversion specifiers. */
588 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
589 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
590 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
591 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
592 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
593 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
595 /* Custom conversion specifiers. */
597 /* %H will require "location_t" at runtime. */
598 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
600 /* These will require a "tree" at runtime. */
601 { "DFJKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
603 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
604 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
605 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
608 static const format_char_info gcc_cdiag_char_table[] =
610 /* C89 conversion specifiers. */
611 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
612 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
613 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
614 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
615 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
616 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
618 /* Custom conversion specifiers. */
620 /* %H will require "location_t" at runtime. */
621 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
623 /* These will require a "tree" at runtime. */
624 { "DEFJKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
626 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
627 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
628 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
631 static const format_char_info gcc_cxxdiag_char_table[] =
633 /* C89 conversion specifiers. */
634 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
635 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
636 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
637 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
638 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
639 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
641 /* Custom conversion specifiers. */
643 /* %H will require "location_t" at runtime. */
644 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
646 /* These will require a "tree" at runtime. */
647 { "ADEFJKTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
649 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
650 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
652 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
653 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
654 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
657 static const format_char_info gcc_gfc_char_table[] =
659 /* C89 conversion specifiers. */
660 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
661 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
662 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
663 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
665 /* gfc conversion specifiers. */
667 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
669 /* This will require a "locus" at runtime. */
670 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
672 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
675 static const format_char_info scan_char_table[] =
677 /* C89 conversion specifiers. */
678 { "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 },
679 { "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 },
680 { "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 },
681 { "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 },
682 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL },
683 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL },
684 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL },
685 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
686 { "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 },
687 /* C99 conversion specifiers. */
688 { "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 },
689 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
690 /* X/Open conversion specifiers. */
691 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL },
692 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL },
693 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
696 static const format_char_info time_char_table[] =
698 /* C89 conversion specifiers. */
699 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
700 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
701 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
702 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
703 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
704 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
705 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
706 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
707 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
708 /* C99 conversion specifiers. */
709 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
710 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
711 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
712 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
713 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
714 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
715 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
716 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
717 /* GNU conversion specifiers. */
718 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
719 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
720 /* DragonFly/FreeBSD conversion specifiers. */
721 { "+", 0, STD_EXT, NOLENGTHS, "E", "3", NULL },
722 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
725 static const format_char_info monetary_char_table[] =
727 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
728 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
731 /* This must be in the same order as enum format_type. */
732 static const format_kind_info format_types_orig[] =
734 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
735 printf_flag_specs, printf_flag_pairs,
736 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
737 'w', 0, 'p', 0, 'L', 0,
738 &integer_type_node, &integer_type_node
740 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
741 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
742 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
743 'w', 0, 'p', 0, 'L', 0,
746 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
747 gcc_diag_flag_specs, gcc_diag_flag_pairs,
748 FMT_FLAG_ARG_CONVERT,
749 0, 0, 'p', 0, 'L', 0,
750 NULL, &integer_type_node
752 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
753 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
754 FMT_FLAG_ARG_CONVERT,
755 0, 0, 'p', 0, 'L', 0,
756 NULL, &integer_type_node
758 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
759 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
760 FMT_FLAG_ARG_CONVERT,
761 0, 0, 'p', 0, 'L', 0,
762 NULL, &integer_type_node
764 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
765 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
766 FMT_FLAG_ARG_CONVERT,
767 0, 0, 'p', 0, 'L', 0,
768 NULL, &integer_type_node
770 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL,
771 NULL, gcc_gfc_flag_pairs,
772 FMT_FLAG_ARG_CONVERT,
776 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
777 scanf_flag_specs, scanf_flag_pairs,
778 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
779 'w', 0, 0, '*', 'L', 'm',
782 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
783 strftime_flag_specs, strftime_flag_pairs,
784 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
787 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
788 strfmon_flag_specs, strfmon_flag_pairs,
789 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
794 /* This layer of indirection allows GCC to reassign format_types with
795 new data if necessary, while still allowing the original data to be
797 static const format_kind_info *format_types = format_types_orig;
798 /* We can modify this one. We also add target-specific format types
799 to the end of the array. */
800 static format_kind_info *dynamic_format_types;
802 static int n_format_types = ARRAY_SIZE (format_types_orig);
804 /* Structure detailing the results of checking a format function call
805 where the format expression may be a conditional expression with
806 many leaves resulting from nested conditional expressions. */
809 /* Number of leaves of the format argument that could not be checked
810 as they were not string literals. */
811 int number_non_literal;
812 /* Number of leaves of the format argument that were null pointers or
813 string literals, but had extra format arguments. */
814 int number_extra_args;
815 /* Number of leaves of the format argument that were null pointers or
816 string literals, but had extra format arguments and used $ operand
818 int number_dollar_extra_args;
819 /* Number of leaves of the format argument that were wide string
822 /* Number of leaves of the format argument that were empty strings. */
824 /* Number of leaves of the format argument that were unterminated
826 int number_unterminated;
827 /* Number of leaves of the format argument that were not counted above. */
829 } format_check_results;
833 format_check_results *res;
834 function_format_info *info;
836 } format_check_context;
838 static void check_format_info (function_format_info *, tree);
839 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
840 static void check_format_info_main (format_check_results *,
841 function_format_info *,
842 const char *, int, tree,
843 unsigned HOST_WIDE_INT, alloc_pool);
845 static void init_dollar_format_checking (int, tree);
846 static int maybe_read_dollar_number (const char **, int,
847 tree, tree *, const format_kind_info *);
848 static bool avoid_dollar_number (const char *);
849 static void finish_dollar_format_checking (format_check_results *, int);
851 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
854 static void check_format_types (format_wanted_type *, const char *, int);
855 static void format_type_warning (const char *, const char *, int, tree,
856 int, const char *, tree, int);
858 /* Decode a format type from a string, returning the type, or
859 format_type_error if not valid, in which case the caller should print an
862 decode_format_type (const char *s)
867 s = convert_format_name_to_system_name (s);
869 for (i = 0; i < n_format_types; i++)
872 if (!strcmp (s, format_types[i].name))
874 alen = strlen (format_types[i].name);
875 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
876 && s[slen - 1] == '_' && s[slen - 2] == '_'
877 && !strncmp (s + 2, format_types[i].name, alen))
880 return format_type_error;
884 /* Check the argument list of a call to printf, scanf, etc.
885 ATTRS are the attributes on the function type. There are NARGS argument
886 values in the array ARGARRAY.
887 Also, if -Wmissing-format-attribute,
888 warn for calls to vprintf or vscanf in functions with no such format
889 attribute themselves. */
892 check_function_format (tree attrs, int nargs, tree *argarray)
896 /* See if this function has any format attributes. */
897 for (a = attrs; a; a = TREE_CHAIN (a))
899 if (is_attribute_p ("format", TREE_PURPOSE (a)))
902 function_format_info info;
903 decode_format_attr (TREE_VALUE (a), &info, 1);
906 /* FIXME: Rewrite all the internal functions in this file
907 to use the ARGARRAY directly instead of constructing this
909 tree params = NULL_TREE;
911 for (i = nargs - 1; i >= 0; i--)
912 params = tree_cons (NULL_TREE, argarray[i], params);
913 check_format_info (&info, params);
915 if (warn_missing_format_attribute && info.first_arg_num == 0
916 && (format_types[info.format_type].flags
917 & (int) FMT_FLAG_ARG_CONVERT))
920 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
923 if (is_attribute_p ("format", TREE_PURPOSE (c))
924 && (decode_format_type (IDENTIFIER_POINTER
925 (TREE_VALUE (TREE_VALUE (c))))
926 == info.format_type))
930 /* Check if the current function has a parameter to which
931 the format attribute could be attached; if not, it
932 can't be a candidate for a format attribute, despite
933 the vprintf-like or vscanf-like call. */
935 for (args = DECL_ARGUMENTS (current_function_decl);
937 args = TREE_CHAIN (args))
939 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
940 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
945 warning (OPT_Wmissing_format_attribute, "function might "
946 "be possible candidate for %qs format attribute",
947 format_types[info.format_type].name);
955 /* Variables used by the checking of $ operand number formats. */
956 static char *dollar_arguments_used = NULL;
957 static char *dollar_arguments_pointer_p = NULL;
958 static int dollar_arguments_alloc = 0;
959 static int dollar_arguments_count;
960 static int dollar_first_arg_num;
961 static int dollar_max_arg_used;
962 static int dollar_format_warned;
964 /* Initialize the checking for a format string that may contain $
965 parameter number specifications; we will need to keep track of whether
966 each parameter has been used. FIRST_ARG_NUM is the number of the first
967 argument that is a parameter to the format, or 0 for a vprintf-style
968 function; PARAMS is the list of arguments starting at this argument. */
971 init_dollar_format_checking (int first_arg_num, tree params)
973 tree oparams = params;
975 dollar_first_arg_num = first_arg_num;
976 dollar_arguments_count = 0;
977 dollar_max_arg_used = 0;
978 dollar_format_warned = 0;
979 if (first_arg_num > 0)
983 dollar_arguments_count++;
984 params = TREE_CHAIN (params);
987 if (dollar_arguments_alloc < dollar_arguments_count)
989 if (dollar_arguments_used)
990 free (dollar_arguments_used);
991 if (dollar_arguments_pointer_p)
992 free (dollar_arguments_pointer_p);
993 dollar_arguments_alloc = dollar_arguments_count;
994 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
995 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
997 if (dollar_arguments_alloc)
999 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1000 if (first_arg_num > 0)
1006 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1008 params = TREE_CHAIN (params);
1016 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1017 is set, it is an error if one is not found; otherwise, it is OK. If
1018 such a number is found, check whether it is within range and mark that
1019 numbered operand as being used for later checking. Returns the operand
1020 number if found and within range, zero if no such number was found and
1021 this is OK, or -1 on error. PARAMS points to the first operand of the
1022 format; PARAM_PTR is made to point to the parameter referred to. If
1023 a $ format is found, *FORMAT is updated to point just after it. */
1026 maybe_read_dollar_number (const char **format,
1027 int dollar_needed, tree params, tree *param_ptr,
1028 const format_kind_info *fki)
1032 const char *fcp = *format;
1033 if (!ISDIGIT (*fcp))
1037 warning (OPT_Wformat, "missing $ operand number in format");
1045 while (ISDIGIT (*fcp))
1048 nargnum = 10 * argnum + (*fcp - '0');
1049 if (nargnum < 0 || nargnum / 10 != argnum)
1058 warning (OPT_Wformat, "missing $ operand number in format");
1065 if (pedantic && !dollar_format_warned)
1067 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1068 C_STD_NAME (STD_EXT));
1069 dollar_format_warned = 1;
1071 if (overflow_flag || argnum == 0
1072 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1074 warning (OPT_Wformat, "operand number out of range in format");
1077 if (argnum > dollar_max_arg_used)
1078 dollar_max_arg_used = argnum;
1079 /* For vprintf-style functions we may need to allocate more memory to
1080 track which arguments are used. */
1081 while (dollar_arguments_alloc < dollar_max_arg_used)
1084 nalloc = 2 * dollar_arguments_alloc + 16;
1085 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1087 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1089 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1090 nalloc - dollar_arguments_alloc);
1091 dollar_arguments_alloc = nalloc;
1093 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1094 && dollar_arguments_used[argnum - 1] == 1)
1096 dollar_arguments_used[argnum - 1] = 2;
1097 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1101 dollar_arguments_used[argnum - 1] = 1;
1102 if (dollar_first_arg_num)
1105 *param_ptr = params;
1106 for (i = 1; i < argnum && *param_ptr != 0; i++)
1107 *param_ptr = TREE_CHAIN (*param_ptr);
1109 /* This case shouldn't be caught here. */
1110 gcc_assert (*param_ptr);
1117 /* Ensure that FORMAT does not start with a decimal number followed by
1118 a $; give a diagnostic and return true if it does, false otherwise. */
1121 avoid_dollar_number (const char *format)
1123 if (!ISDIGIT (*format))
1125 while (ISDIGIT (*format))
1129 warning (OPT_Wformat, "$ operand number used after format without operand number");
1136 /* Finish the checking for a format string that used $ operand number formats
1137 instead of non-$ formats. We check for unused operands before used ones
1138 (a serious error, since the implementation of the format function
1139 can't know what types to pass to va_arg to find the later arguments).
1140 and for unused operands at the end of the format (if we know how many
1141 arguments the format had, so not for vprintf). If there were operand
1142 numbers out of range on a non-vprintf-style format, we won't have reached
1143 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1147 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1150 bool found_pointer_gap = false;
1151 for (i = 0; i < dollar_max_arg_used; i++)
1153 if (!dollar_arguments_used[i])
1155 if (pointer_gap_ok && (dollar_first_arg_num == 0
1156 || dollar_arguments_pointer_p[i]))
1157 found_pointer_gap = true;
1159 warning (OPT_Wformat,
1160 "format argument %d unused before used argument %d in $-style format",
1161 i + 1, dollar_max_arg_used);
1164 if (found_pointer_gap
1165 || (dollar_first_arg_num
1166 && dollar_max_arg_used < dollar_arguments_count))
1168 res->number_other--;
1169 res->number_dollar_extra_args++;
1174 /* Retrieve the specification for a format flag. SPEC contains the
1175 specifications for format flags for the applicable kind of format.
1176 FLAG is the flag in question. If PREDICATES is NULL, the basic
1177 spec for that flag must be retrieved and must exist. If
1178 PREDICATES is not NULL, it is a string listing possible predicates
1179 for the spec entry; if an entry predicated on any of these is
1180 found, it is returned, otherwise NULL is returned. */
1182 static const format_flag_spec *
1183 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1186 for (i = 0; spec[i].flag_char != 0; i++)
1188 if (spec[i].flag_char != flag)
1190 if (predicates != NULL)
1192 if (spec[i].predicate != 0
1193 && strchr (predicates, spec[i].predicate) != 0)
1196 else if (spec[i].predicate == 0)
1199 gcc_assert (predicates);
1204 /* Check the argument list of a call to printf, scanf, etc.
1205 INFO points to the function_format_info structure.
1206 PARAMS is the list of argument values. */
1209 check_format_info (function_format_info *info, tree params)
1211 format_check_context format_ctx;
1212 unsigned HOST_WIDE_INT arg_num;
1214 format_check_results res;
1215 /* Skip to format argument. If the argument isn't available, there's
1216 no work for us to do; prototype checking will catch the problem. */
1217 for (arg_num = 1; ; ++arg_num)
1221 if (arg_num == info->format_num)
1223 params = TREE_CHAIN (params);
1225 format_tree = TREE_VALUE (params);
1226 params = TREE_CHAIN (params);
1227 if (format_tree == 0)
1230 res.number_non_literal = 0;
1231 res.number_extra_args = 0;
1232 res.number_dollar_extra_args = 0;
1233 res.number_wide = 0;
1234 res.number_empty = 0;
1235 res.number_unterminated = 0;
1236 res.number_other = 0;
1238 format_ctx.res = &res;
1239 format_ctx.info = info;
1240 format_ctx.params = params;
1242 check_function_arguments_recurse (check_format_arg, &format_ctx,
1243 format_tree, arg_num);
1245 if (res.number_non_literal > 0)
1247 /* Functions taking a va_list normally pass a non-literal format
1248 string. These functions typically are declared with
1249 first_arg_num == 0, so avoid warning in those cases. */
1250 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1252 /* For strftime-like formats, warn for not checking the format
1253 string; but there are no arguments to check. */
1254 warning (OPT_Wformat_nonliteral,
1255 "format not a string literal, format string not checked");
1257 else if (info->first_arg_num != 0)
1259 /* If there are no arguments for the format at all, we may have
1260 printf (foo) which is likely to be a security hole. */
1261 while (arg_num + 1 < info->first_arg_num)
1265 params = TREE_CHAIN (params);
1268 if (params == 0 && warn_format_security)
1269 warning (OPT_Wformat_security,
1270 "format not a string literal and no format arguments");
1271 else if (params == 0 && warn_format_nonliteral)
1272 warning (OPT_Wformat_nonliteral,
1273 "format not a string literal and no format arguments");
1275 warning (OPT_Wformat_nonliteral,
1276 "format not a string literal, argument types not checked");
1280 /* If there were extra arguments to the format, normally warn. However,
1281 the standard does say extra arguments are ignored, so in the specific
1282 case where we have multiple leaves (conditional expressions or
1283 ngettext) allow extra arguments if at least one leaf didn't have extra
1284 arguments, but was otherwise OK (either non-literal or checked OK).
1285 If the format is an empty string, this should be counted similarly to the
1286 case of extra format arguments. */
1287 if (res.number_extra_args > 0 && res.number_non_literal == 0
1288 && res.number_other == 0)
1289 warning (OPT_Wformat_extra_args, "too many arguments for format");
1290 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1291 && res.number_other == 0)
1292 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1293 if (res.number_empty > 0 && res.number_non_literal == 0
1294 && res.number_other == 0)
1295 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1296 format_types[info->format_type].name);
1298 if (res.number_wide > 0)
1299 warning (OPT_Wformat, "format is a wide character string");
1301 if (res.number_unterminated > 0)
1302 warning (OPT_Wformat, "unterminated format string");
1305 /* Callback from check_function_arguments_recurse to check a
1306 format string. FORMAT_TREE is the format parameter. ARG_NUM
1307 is the number of the format argument. CTX points to a
1308 format_check_context. */
1311 check_format_arg (void *ctx, tree format_tree,
1312 unsigned HOST_WIDE_INT arg_num)
1314 format_check_context *format_ctx = (format_check_context *) ctx;
1315 format_check_results *res = format_ctx->res;
1316 function_format_info *info = format_ctx->info;
1317 tree params = format_ctx->params;
1320 HOST_WIDE_INT offset;
1321 const char *format_chars;
1322 tree array_size = 0;
1324 alloc_pool fwt_pool;
1326 if (integer_zerop (format_tree))
1328 /* Skip to first argument to check, so we can see if this format
1329 has any arguments (it shouldn't). */
1330 while (arg_num + 1 < info->first_arg_num)
1334 params = TREE_CHAIN (params);
1339 res->number_other++;
1341 res->number_extra_args++;
1347 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1351 arg0 = TREE_OPERAND (format_tree, 0);
1352 arg1 = TREE_OPERAND (format_tree, 1);
1355 if (TREE_CODE (arg1) == INTEGER_CST)
1359 res->number_non_literal++;
1362 if (!host_integerp (arg1, 0)
1363 || (offset = tree_low_cst (arg1, 0)) < 0)
1365 res->number_non_literal++;
1369 if (TREE_CODE (format_tree) != ADDR_EXPR)
1371 res->number_non_literal++;
1374 format_tree = TREE_OPERAND (format_tree, 0);
1375 if (TREE_CODE (format_tree) == ARRAY_REF
1376 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1377 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1378 format_tree = TREE_OPERAND (format_tree, 0);
1379 if (TREE_CODE (format_tree) == VAR_DECL
1380 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1381 && (array_init = decl_constant_value (format_tree)) != format_tree
1382 && TREE_CODE (array_init) == STRING_CST)
1384 /* Extract the string constant initializer. Note that this may include
1385 a trailing NUL character that is not in the array (e.g.
1386 const char a[3] = "foo";). */
1387 array_size = DECL_SIZE_UNIT (format_tree);
1388 format_tree = array_init;
1390 if (TREE_CODE (format_tree) != STRING_CST)
1392 res->number_non_literal++;
1395 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1400 format_chars = TREE_STRING_POINTER (format_tree);
1401 format_length = TREE_STRING_LENGTH (format_tree);
1402 if (array_size != 0)
1404 /* Variable length arrays can't be initialized. */
1405 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1407 if (host_integerp (array_size, 0))
1409 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1410 if (array_size_value > 0
1411 && array_size_value == (int) array_size_value
1412 && format_length > array_size_value)
1413 format_length = array_size_value;
1418 if (offset >= format_length)
1420 res->number_non_literal++;
1423 format_chars += offset;
1424 format_length -= offset;
1426 if (format_length < 1 || format_chars[--format_length] != 0)
1428 res->number_unterminated++;
1431 if (format_length == 0)
1433 res->number_empty++;
1437 /* Skip to first argument to check. */
1438 while (arg_num + 1 < info->first_arg_num)
1442 params = TREE_CHAIN (params);
1445 /* Provisionally increment res->number_other; check_format_info_main
1446 will decrement it if it finds there are extra arguments, but this way
1447 need not adjust it for every return. */
1448 res->number_other++;
1449 fwt_pool = create_alloc_pool ("format_wanted_type pool",
1450 sizeof (format_wanted_type), 10);
1451 check_format_info_main (res, info, format_chars, format_length,
1452 params, arg_num, fwt_pool);
1453 free_alloc_pool (fwt_pool);
1457 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1458 is the NUL-terminated format string (which at this point may contain
1459 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1460 terminating NUL character). ARG_NUM is one less than the number of
1461 the first format argument to check; PARAMS points to that format
1462 argument in the list of arguments. */
1465 check_format_info_main (format_check_results *res,
1466 function_format_info *info, const char *format_chars,
1467 int format_length, tree params,
1468 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool)
1470 const char *orig_format_chars = format_chars;
1471 tree first_fillin_param = params;
1473 const format_kind_info *fki = &format_types[info->format_type];
1474 const format_flag_spec *flag_specs = fki->flag_specs;
1475 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1477 /* -1 if no conversions taking an operand have been found; 0 if one has
1478 and it didn't use $; 1 if $ formats are in use. */
1479 int has_operand_number = -1;
1481 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1486 int suppressed = FALSE;
1487 const char *length_chars = NULL;
1488 enum format_lengths length_chars_val = FMT_LEN_none;
1489 enum format_std_version length_chars_std = STD_C89;
1493 int main_arg_num = 0;
1494 tree main_arg_params = 0;
1495 enum format_std_version wanted_type_std;
1496 const char *wanted_type_name;
1497 format_wanted_type width_wanted_type;
1498 format_wanted_type precision_wanted_type;
1499 format_wanted_type main_wanted_type;
1500 format_wanted_type *first_wanted_type = NULL;
1501 format_wanted_type *last_wanted_type = NULL;
1502 const format_length_info *fli = NULL;
1503 const format_char_info *fci = NULL;
1504 char flag_chars[256];
1506 const char *format_start = format_chars;
1507 if (*format_chars == 0)
1509 if (format_chars - orig_format_chars != format_length)
1510 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
1511 if (info->first_arg_num != 0 && params != 0
1512 && has_operand_number <= 0)
1514 res->number_other--;
1515 res->number_extra_args++;
1517 if (has_operand_number > 0)
1518 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1521 if (*format_chars++ != '%')
1523 if (*format_chars == 0)
1525 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1528 if (*format_chars == '%')
1535 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1537 /* Possibly read a $ operand number at the start of the format.
1538 If one was previously used, one is required here. If one
1539 is not used here, we can't immediately conclude this is a
1540 format without them, since it could be printf %m or scanf %*. */
1542 opnum = maybe_read_dollar_number (&format_chars, 0,
1544 &main_arg_params, fki);
1549 has_operand_number = 1;
1550 main_arg_num = opnum + info->first_arg_num - 1;
1553 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1555 if (avoid_dollar_number (format_chars))
1559 /* Read any format flags, but do not yet validate them beyond removing
1560 duplicates, since in general validation depends on the rest of
1562 while (*format_chars != 0
1563 && strchr (fki->flag_chars, *format_chars) != 0)
1565 const format_flag_spec *s = get_flag_spec (flag_specs,
1566 *format_chars, NULL);
1567 if (strchr (flag_chars, *format_chars) != 0)
1569 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1573 i = strlen (flag_chars);
1574 flag_chars[i++] = *format_chars;
1577 if (s->skip_next_char)
1580 if (*format_chars == 0)
1582 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1589 /* Read any format width, possibly * or *m$. */
1590 if (fki->width_char != 0)
1592 if (fki->width_type != NULL && *format_chars == '*')
1594 i = strlen (flag_chars);
1595 flag_chars[i++] = fki->width_char;
1597 /* "...a field width...may be indicated by an asterisk.
1598 In this case, an int argument supplies the field width..." */
1600 if (has_operand_number != 0)
1603 opnum = maybe_read_dollar_number (&format_chars,
1604 has_operand_number == 1,
1611 has_operand_number = 1;
1612 arg_num = opnum + info->first_arg_num - 1;
1615 has_operand_number = 0;
1619 if (avoid_dollar_number (format_chars))
1622 if (info->first_arg_num != 0)
1626 warning (OPT_Wformat, "too few arguments for format");
1629 cur_param = TREE_VALUE (params);
1630 if (has_operand_number <= 0)
1632 params = TREE_CHAIN (params);
1635 width_wanted_type.wanted_type = *fki->width_type;
1636 width_wanted_type.wanted_type_name = NULL;
1637 width_wanted_type.pointer_count = 0;
1638 width_wanted_type.char_lenient_flag = 0;
1639 width_wanted_type.writing_in_flag = 0;
1640 width_wanted_type.reading_from_flag = 0;
1641 width_wanted_type.name = _("field width");
1642 width_wanted_type.param = cur_param;
1643 width_wanted_type.arg_num = arg_num;
1644 width_wanted_type.next = NULL;
1645 if (last_wanted_type != 0)
1646 last_wanted_type->next = &width_wanted_type;
1647 if (first_wanted_type == 0)
1648 first_wanted_type = &width_wanted_type;
1649 last_wanted_type = &width_wanted_type;
1654 /* Possibly read a numeric width. If the width is zero,
1655 we complain if appropriate. */
1656 int non_zero_width_char = FALSE;
1657 int found_width = FALSE;
1658 while (ISDIGIT (*format_chars))
1661 if (*format_chars != '0')
1662 non_zero_width_char = TRUE;
1665 if (found_width && !non_zero_width_char &&
1666 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1667 warning (OPT_Wformat, "zero width in %s format", fki->name);
1670 i = strlen (flag_chars);
1671 flag_chars[i++] = fki->width_char;
1677 /* Read any format left precision (must be a number, not *). */
1678 if (fki->left_precision_char != 0 && *format_chars == '#')
1681 i = strlen (flag_chars);
1682 flag_chars[i++] = fki->left_precision_char;
1684 if (!ISDIGIT (*format_chars))
1685 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1686 while (ISDIGIT (*format_chars))
1690 /* Read any format precision, possibly * or *m$. */
1691 if (fki->precision_char != 0 && *format_chars == '.')
1694 i = strlen (flag_chars);
1695 flag_chars[i++] = fki->precision_char;
1697 if (fki->precision_type != NULL && *format_chars == '*')
1699 /* "...a...precision...may be indicated by an asterisk.
1700 In this case, an int argument supplies the...precision." */
1702 if (has_operand_number != 0)
1705 opnum = maybe_read_dollar_number (&format_chars,
1706 has_operand_number == 1,
1713 has_operand_number = 1;
1714 arg_num = opnum + info->first_arg_num - 1;
1717 has_operand_number = 0;
1721 if (avoid_dollar_number (format_chars))
1724 if (info->first_arg_num != 0)
1728 warning (OPT_Wformat, "too few arguments for format");
1731 cur_param = TREE_VALUE (params);
1732 if (has_operand_number <= 0)
1734 params = TREE_CHAIN (params);
1737 precision_wanted_type.wanted_type = *fki->precision_type;
1738 precision_wanted_type.wanted_type_name = NULL;
1739 precision_wanted_type.pointer_count = 0;
1740 precision_wanted_type.char_lenient_flag = 0;
1741 precision_wanted_type.writing_in_flag = 0;
1742 precision_wanted_type.reading_from_flag = 0;
1743 precision_wanted_type.name = _("field precision");
1744 precision_wanted_type.param = cur_param;
1745 precision_wanted_type.arg_num = arg_num;
1746 precision_wanted_type.next = NULL;
1747 if (last_wanted_type != 0)
1748 last_wanted_type->next = &precision_wanted_type;
1749 if (first_wanted_type == 0)
1750 first_wanted_type = &precision_wanted_type;
1751 last_wanted_type = &precision_wanted_type;
1756 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1757 && !ISDIGIT (*format_chars))
1758 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1759 while (ISDIGIT (*format_chars))
1764 if (fki->alloc_char && fki->alloc_char == *format_chars)
1766 i = strlen (flag_chars);
1767 flag_chars[i++] = fki->alloc_char;
1772 /* Handle the scanf allocation kludge. */
1773 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1775 if (*format_chars == 'a' && !flag_isoc99)
1777 if (format_chars[1] == 's' || format_chars[1] == 'S'
1778 || format_chars[1] == '[')
1780 /* 'a' is used as a flag. */
1781 i = strlen (flag_chars);
1782 flag_chars[i++] = 'a';
1789 /* Read any length modifier, if this kind of format has them. */
1790 fli = fki->length_char_specs;
1791 length_chars = NULL;
1792 length_chars_val = FMT_LEN_none;
1793 length_chars_std = STD_C89;
1796 while (fli->name != 0
1797 && strncmp (fli->name, format_chars, strlen (fli->name)))
1801 format_chars += strlen (fli->name);
1802 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1805 length_chars = fli->double_name;
1806 length_chars_val = fli->double_index;
1807 length_chars_std = fli->double_std;
1811 length_chars = fli->name;
1812 length_chars_val = fli->index;
1813 length_chars_std = fli->std;
1815 i = strlen (flag_chars);
1816 flag_chars[i++] = fki->length_code_char;
1821 /* Warn if the length modifier is non-standard. */
1822 if (ADJ_STD (length_chars_std) > C_STD_VER)
1823 warning (OPT_Wformat,
1824 "%s does not support the %qs %s length modifier",
1825 C_STD_NAME (length_chars_std), length_chars,
1830 /* Read any modifier (strftime E/O). */
1831 if (fki->modifier_chars != NULL)
1833 while (*format_chars != 0
1834 && strchr (fki->modifier_chars, *format_chars) != 0)
1836 if (strchr (flag_chars, *format_chars) != 0)
1838 const format_flag_spec *s = get_flag_spec (flag_specs,
1839 *format_chars, NULL);
1840 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1844 i = strlen (flag_chars);
1845 flag_chars[i++] = *format_chars;
1852 format_char = *format_chars;
1853 if (format_char == 0
1854 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1855 && format_char == '%'))
1857 warning (OPT_Wformat, "conversion lacks type at end of format");
1861 fci = fki->conversion_specs;
1862 while (fci->format_chars != 0
1863 && strchr (fci->format_chars, format_char) == 0)
1865 if (fci->format_chars == 0)
1867 if (ISGRAPH (format_char))
1868 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1871 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1877 if (ADJ_STD (fci->std) > C_STD_VER)
1878 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1879 C_STD_NAME (fci->std), format_char, fki->name);
1882 /* Validate the individual flags used, removing any that are invalid. */
1885 for (i = 0; flag_chars[i] != 0; i++)
1887 const format_flag_spec *s = get_flag_spec (flag_specs,
1888 flag_chars[i], NULL);
1889 flag_chars[i - d] = flag_chars[i];
1890 if (flag_chars[i] == fki->length_code_char)
1892 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1894 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1895 _(s->name), format_char, fki->name);
1901 const format_flag_spec *t;
1902 if (ADJ_STD (s->std) > C_STD_VER)
1903 warning (OPT_Wformat, "%s does not support %s",
1904 C_STD_NAME (s->std), _(s->long_name));
1905 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1906 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1908 const char *long_name = (t->long_name != NULL
1911 if (ADJ_STD (t->std) > C_STD_VER)
1912 warning (OPT_Wformat,
1913 "%s does not support %s with the %<%%%c%> %s format",
1914 C_STD_NAME (t->std), _(long_name),
1915 format_char, fki->name);
1919 flag_chars[i - d] = 0;
1922 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1923 && strchr (flag_chars, 'a') != 0)
1925 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0)
1928 if (fki->suppression_char
1929 && strchr (flag_chars, fki->suppression_char) != 0)
1932 /* Validate the pairs of flags used. */
1933 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1935 const format_flag_spec *s, *t;
1936 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1938 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1940 if (bad_flag_pairs[i].predicate != 0
1941 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1943 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1944 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1945 if (bad_flag_pairs[i].ignored)
1947 if (bad_flag_pairs[i].predicate != 0)
1948 warning (OPT_Wformat,
1949 "%s ignored with %s and %<%%%c%> %s format",
1950 _(s->name), _(t->name), format_char,
1953 warning (OPT_Wformat, "%s ignored with %s in %s format",
1954 _(s->name), _(t->name), fki->name);
1958 if (bad_flag_pairs[i].predicate != 0)
1959 warning (OPT_Wformat,
1960 "use of %s and %s together with %<%%%c%> %s format",
1961 _(s->name), _(t->name), format_char,
1964 warning (OPT_Wformat, "use of %s and %s together in %s format",
1965 _(s->name), _(t->name), fki->name);
1969 /* Give Y2K warnings. */
1970 if (warn_format_y2k)
1973 if (strchr (fci->flags2, '4') != 0)
1974 if (strchr (flag_chars, 'E') != 0)
1978 else if (strchr (fci->flags2, '3') != 0)
1980 else if (strchr (fci->flags2, '2') != 0)
1983 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1984 "year in some locales", format_char);
1985 else if (y2k_level == 2)
1986 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1987 "year", format_char);
1990 if (strchr (fci->flags2, '[') != 0)
1992 /* Skip over scan set, in case it happens to have '%' in it. */
1993 if (*format_chars == '^')
1995 /* Find closing bracket; if one is hit immediately, then
1996 it's part of the scan set rather than a terminator. */
1997 if (*format_chars == ']')
1999 while (*format_chars && *format_chars != ']')
2001 if (*format_chars != ']')
2002 /* The end of the format string was reached. */
2003 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
2007 wanted_type_name = 0;
2008 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
2010 wanted_type = (fci->types[length_chars_val].type
2011 ? *fci->types[length_chars_val].type : 0);
2012 wanted_type_name = fci->types[length_chars_val].name;
2013 wanted_type_std = fci->types[length_chars_val].std;
2014 if (wanted_type == 0)
2016 warning (OPT_Wformat,
2017 "use of %qs length modifier with %qc type character",
2018 length_chars, format_char);
2019 /* Heuristic: skip one argument when an invalid length/type
2020 combination is encountered. */
2024 warning (OPT_Wformat, "too few arguments for format");
2027 params = TREE_CHAIN (params);
2031 /* Warn if non-standard, provided it is more non-standard
2032 than the length and type characters that may already
2033 have been warned for. */
2034 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2035 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2037 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2038 warning (OPT_Wformat,
2039 "%s does not support the %<%%%s%c%> %s format",
2040 C_STD_NAME (wanted_type_std), length_chars,
2041 format_char, fki->name);
2045 main_wanted_type.next = NULL;
2047 /* Finally. . .check type of argument against desired type! */
2048 if (info->first_arg_num == 0)
2050 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2053 if (main_arg_num != 0)
2056 warning (OPT_Wformat, "operand number specified with "
2057 "suppressed assignment");
2059 warning (OPT_Wformat, "operand number specified for format "
2060 "taking no argument");
2065 format_wanted_type *wanted_type_ptr;
2067 if (main_arg_num != 0)
2069 arg_num = main_arg_num;
2070 params = main_arg_params;
2075 if (has_operand_number > 0)
2077 warning (OPT_Wformat, "missing $ operand number in format");
2081 has_operand_number = 0;
2084 wanted_type_ptr = &main_wanted_type;
2089 warning (OPT_Wformat, "too few arguments for format");
2093 cur_param = TREE_VALUE (params);
2094 params = TREE_CHAIN (params);
2096 wanted_type_ptr->wanted_type = wanted_type;
2097 wanted_type_ptr->wanted_type_name = wanted_type_name;
2098 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2099 wanted_type_ptr->char_lenient_flag = 0;
2100 if (strchr (fci->flags2, 'c') != 0)
2101 wanted_type_ptr->char_lenient_flag = 1;
2102 wanted_type_ptr->writing_in_flag = 0;
2103 wanted_type_ptr->reading_from_flag = 0;
2105 wanted_type_ptr->writing_in_flag = 1;
2108 if (strchr (fci->flags2, 'W') != 0)
2109 wanted_type_ptr->writing_in_flag = 1;
2110 if (strchr (fci->flags2, 'R') != 0)
2111 wanted_type_ptr->reading_from_flag = 1;
2113 wanted_type_ptr->name = NULL;
2114 wanted_type_ptr->param = cur_param;
2115 wanted_type_ptr->arg_num = arg_num;
2116 wanted_type_ptr->next = NULL;
2117 if (last_wanted_type != 0)
2118 last_wanted_type->next = wanted_type_ptr;
2119 if (first_wanted_type == 0)
2120 first_wanted_type = wanted_type_ptr;
2121 last_wanted_type = wanted_type_ptr;
2126 wanted_type_ptr = (format_wanted_type *)
2127 pool_alloc (fwt_pool);
2129 wanted_type = *fci->types[length_chars_val].type;
2130 wanted_type_name = fci->types[length_chars_val].name;
2135 if (first_wanted_type != 0)
2136 check_format_types (first_wanted_type, format_start,
2137 format_chars - format_start);
2142 /* Check the argument types from a single format conversion (possibly
2143 including width and precision arguments). */
2145 check_format_types (format_wanted_type *types, const char *format_start,
2148 for (; types != 0; types = types->next)
2157 cur_param = types->param;
2158 cur_type = TREE_TYPE (cur_param);
2159 if (cur_type == error_mark_node)
2161 orig_cur_type = cur_type;
2163 wanted_type = types->wanted_type;
2164 arg_num = types->arg_num;
2166 /* The following should not occur here. */
2167 gcc_assert (wanted_type);
2168 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2170 if (types->pointer_count == 0)
2171 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2173 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2175 STRIP_NOPS (cur_param);
2177 /* Check the types of any additional pointer arguments
2178 that precede the "real" argument. */
2179 for (i = 0; i < types->pointer_count; ++i)
2181 if (TREE_CODE (cur_type) == POINTER_TYPE)
2183 cur_type = TREE_TYPE (cur_type);
2184 if (cur_type == error_mark_node)
2187 /* Check for writing through a NULL pointer. */
2188 if (types->writing_in_flag
2191 && integer_zerop (cur_param))
2192 warning (OPT_Wformat, "writing through null pointer "
2193 "(argument %d)", arg_num);
2195 /* Check for reading through a NULL pointer. */
2196 if (types->reading_from_flag
2199 && integer_zerop (cur_param))
2200 warning (OPT_Wformat, "reading through null pointer "
2201 "(argument %d)", arg_num);
2203 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2204 cur_param = TREE_OPERAND (cur_param, 0);
2208 /* See if this is an attempt to write into a const type with
2209 scanf or with printf "%n". Note: the writing in happens
2210 at the first indirection only, if for example
2211 void * const * is passed to scanf %p; passing
2212 const void ** is simply passing an incompatible type. */
2213 if (types->writing_in_flag
2215 && (TYPE_READONLY (cur_type)
2217 && (CONSTANT_CLASS_P (cur_param)
2218 || (DECL_P (cur_param)
2219 && TREE_READONLY (cur_param))))))
2220 warning (OPT_Wformat, "writing into constant object "
2221 "(argument %d)", arg_num);
2223 /* If there are extra type qualifiers beyond the first
2224 indirection, then this makes the types technically
2228 && (TYPE_READONLY (cur_type)
2229 || TYPE_VOLATILE (cur_type)
2230 || TYPE_RESTRICT (cur_type)))
2231 warning (OPT_Wformat, "extra type qualifiers in format "
2232 "argument (argument %d)",
2238 format_type_warning (types->name, format_start, format_length,
2239 wanted_type, types->pointer_count,
2240 types->wanted_type_name, orig_cur_type,
2246 if (i < types->pointer_count)
2249 cur_type = TYPE_MAIN_VARIANT (cur_type);
2251 /* Check whether the argument type is a character type. This leniency
2252 only applies to certain formats, flagged with 'c'.
2254 if (types->char_lenient_flag)
2255 char_type_flag = (cur_type == char_type_node
2256 || cur_type == signed_char_type_node
2257 || cur_type == unsigned_char_type_node);
2259 /* Check the type of the "real" argument, if there's a type we want. */
2260 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2262 /* If we want 'void *', allow any pointer type.
2263 (Anything else would already have got a warning.)
2264 With -pedantic, only allow pointers to void and to character
2266 if (wanted_type == void_type_node
2267 && (!pedantic || (i == 1 && char_type_flag)))
2269 /* Don't warn about differences merely in signedness, unless
2270 -pedantic. With -pedantic, warn if the type is a pointer
2271 target and not a character type, and for character types at
2272 a second level of indirection. */
2273 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2274 && TREE_CODE (cur_type) == INTEGER_TYPE
2275 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2276 && (TYPE_UNSIGNED (wanted_type)
2277 ? wanted_type == c_common_unsigned_type (cur_type)
2278 : wanted_type == c_common_signed_type (cur_type)))
2280 /* Likewise, "signed char", "unsigned char" and "char" are
2281 equivalent but the above test won't consider them equivalent. */
2282 if (wanted_type == char_type_node
2283 && (!pedantic || i < 2)
2286 /* Now we have a type mismatch. */
2287 format_type_warning (types->name, format_start, format_length,
2288 wanted_type, types->pointer_count,
2289 types->wanted_type_name, orig_cur_type, arg_num);
2294 /* Give a warning about a format argument of different type from that
2295 expected. DESCR is a description such as "field precision", or
2296 NULL for an ordinary format. For an ordinary format, FORMAT_START
2297 points to where the format starts in the format string and
2298 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2299 should have after POINTER_COUNT pointer dereferences.
2300 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2301 or NULL if the ordinary name of the type should be used. ARG_TYPE
2302 is the type of the actual argument. ARG_NUM is the number of that
2305 format_type_warning (const char *descr, const char *format_start,
2306 int format_length, tree wanted_type, int pointer_count,
2307 const char *wanted_type_name, tree arg_type, int arg_num)
2310 /* If ARG_TYPE is a typedef with a misleading name (for example,
2311 size_t but not the standard size_t expected by printf %zu), avoid
2312 printing the typedef name. */
2313 if (wanted_type_name
2314 && TYPE_NAME (arg_type)
2315 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2316 && DECL_NAME (TYPE_NAME (arg_type))
2317 && !strcmp (wanted_type_name,
2318 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2319 arg_type = TYPE_MAIN_VARIANT (arg_type);
2320 /* The format type and name exclude any '*' for pointers, so those
2321 must be formatted manually. For all the types we currently have,
2322 this is adequate, but formats taking pointers to functions or
2323 arrays would require the full type to be built up in order to
2324 print it with %T. */
2325 p = (char *) alloca (pointer_count + 2);
2326 if (pointer_count == 0)
2328 else if (c_dialect_cxx ())
2330 memset (p, '*', pointer_count);
2331 p[pointer_count] = 0;
2336 memset (p + 1, '*', pointer_count);
2337 p[pointer_count + 1] = 0;
2339 if (wanted_type_name)
2342 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2343 "but argument %d has type %qT",
2344 descr, wanted_type_name, p, arg_num, arg_type);
2346 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2347 "but argument %d has type %qT",
2348 format_length, format_start, wanted_type_name, p,
2354 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2355 "but argument %d has type %qT",
2356 descr, wanted_type, p, arg_num, arg_type);
2358 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2359 "but argument %d has type %qT",
2360 format_length, format_start, wanted_type, p, arg_num, arg_type);
2365 /* Given a format_char_info array FCI, and a character C, this function
2366 returns the index into the conversion_specs where that specifier's
2367 data is located. The character must exist. */
2369 find_char_info_specifier_index (const format_char_info *fci, int c)
2373 for (i = 0; fci->format_chars; i++, fci++)
2374 if (strchr (fci->format_chars, c))
2377 /* We shouldn't be looking for a non-existent specifier. */
2381 /* Given a format_length_info array FLI, and a character C, this
2382 function returns the index into the conversion_specs where that
2383 modifier's data is located. The character must exist. */
2385 find_length_info_modifier_index (const format_length_info *fli, int c)
2389 for (i = 0; fli->name; i++, fli++)
2390 if (strchr (fli->name, c))
2393 /* We shouldn't be looking for a non-existent modifier. */
2397 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2398 use in GCC's __asm_fprintf__ custom format attribute. You must
2399 have set dynamic_format_types before calling this function. */
2401 init_dynamic_asm_fprintf_info (void)
2407 format_length_info *new_asm_fprintf_length_specs;
2410 /* Find the underlying type for HOST_WIDE_INT. For the %w
2411 length modifier to work, one must have issued: "typedef
2412 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2413 prior to using that modifier. */
2414 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2417 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2420 hwi = identifier_global_value (hwi);
2421 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2423 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2426 hwi = DECL_ORIGINAL_TYPE (hwi);
2428 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2430 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2431 " or %<long long%>");
2435 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2436 new_asm_fprintf_length_specs = (format_length_info *)
2437 xmemdup (asm_fprintf_length_specs,
2438 sizeof (asm_fprintf_length_specs),
2439 sizeof (asm_fprintf_length_specs));
2441 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2442 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2443 if (hwi == long_integer_type_node)
2444 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2445 else if (hwi == long_long_integer_type_node)
2446 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2450 /* Assign the new data for use. */
2451 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2452 new_asm_fprintf_length_specs;
2456 /* Determine the type of a "locus" in the code being compiled for use
2457 in GCC's __gcc_gfc__ custom format attribute. You must have set
2458 dynamic_format_types before calling this function. */
2460 init_dynamic_gfc_info (void)
2466 static format_char_info *gfc_fci;
2468 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2469 must have declared 'locus' prior to using this attribute. If
2470 we haven't seen this declarations then you shouldn't use the
2471 specifier requiring that type. */
2472 if ((locus = maybe_get_identifier ("locus")))
2474 locus = identifier_global_value (locus);
2477 if (TREE_CODE (locus) != TYPE_DECL
2478 || TREE_TYPE (locus) == error_mark_node)
2480 error ("%<locus%> is not defined as a type");
2484 locus = TREE_TYPE (locus);
2488 /* Assign the new data for use. */
2490 /* Handle the __gcc_gfc__ format specifics. */
2492 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2493 gfc_fci = (format_char_info *)
2494 xmemdup (gcc_gfc_char_table,
2495 sizeof (gcc_gfc_char_table),
2496 sizeof (gcc_gfc_char_table));
2499 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2500 gfc_fci[i].types[0].type = &locus;
2501 gfc_fci[i].pointer_count = 1;
2506 /* Determine the types of "tree" and "location_t" in the code being
2507 compiled for use in GCC's diagnostic custom format attributes. You
2508 must have set dynamic_format_types before calling this function. */
2510 init_dynamic_diag_info (void)
2512 static tree t, loc, hwi;
2514 if (!loc || !t || !hwi)
2516 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2517 static format_length_info *diag_ls;
2520 /* For the GCC-diagnostics custom format specifiers to work, one
2521 must have declared 'tree' and/or 'location_t' prior to using
2522 those attributes. If we haven't seen these declarations then
2523 you shouldn't use the specifiers requiring these types.
2524 However we don't force a hard ICE because we may see only one
2525 or the other type. */
2526 if ((loc = maybe_get_identifier ("location_t")))
2528 loc = identifier_global_value (loc);
2531 if (TREE_CODE (loc) != TYPE_DECL)
2533 error ("%<location_t%> is not defined as a type");
2537 loc = TREE_TYPE (loc);
2541 /* We need to grab the underlying 'union tree_node' so peek into
2542 an extra type level. */
2543 if ((t = maybe_get_identifier ("tree")))
2545 t = identifier_global_value (t);
2548 if (TREE_CODE (t) != TYPE_DECL)
2550 error ("%<tree%> is not defined as a type");
2553 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2555 error ("%<tree%> is not defined as a pointer type");
2559 t = TREE_TYPE (TREE_TYPE (t));
2563 /* Find the underlying type for HOST_WIDE_INT. For the %w
2564 length modifier to work, one must have issued: "typedef
2565 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2566 prior to using that modifier. */
2567 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2569 hwi = identifier_global_value (hwi);
2572 if (TREE_CODE (hwi) != TYPE_DECL)
2574 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2579 hwi = DECL_ORIGINAL_TYPE (hwi);
2581 if (hwi != long_integer_type_node
2582 && hwi != long_long_integer_type_node)
2584 error ("%<__gcc_host_wide_int__%> is not defined"
2585 " as %<long%> or %<long long%>");
2592 /* Assign the new data for use. */
2594 /* All the GCC diag formats use the same length specs. */
2596 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2597 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2598 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2599 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2600 diag_ls = (format_length_info *)
2601 xmemdup (gcc_diag_length_specs,
2602 sizeof (gcc_diag_length_specs),
2603 sizeof (gcc_diag_length_specs));
2606 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2607 i = find_length_info_modifier_index (diag_ls, 'w');
2608 if (hwi == long_integer_type_node)
2609 diag_ls[i].index = FMT_LEN_l;
2610 else if (hwi == long_long_integer_type_node)
2611 diag_ls[i].index = FMT_LEN_ll;
2616 /* Handle the __gcc_diag__ format specifics. */
2618 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2619 diag_fci = (format_char_info *)
2620 xmemdup (gcc_diag_char_table,
2621 sizeof (gcc_diag_char_table),
2622 sizeof (gcc_diag_char_table));
2625 i = find_char_info_specifier_index (diag_fci, 'H');
2626 diag_fci[i].types[0].type = &loc;
2627 diag_fci[i].pointer_count = 1;
2631 i = find_char_info_specifier_index (diag_fci, 'J');
2632 diag_fci[i].types[0].type = &t;
2633 diag_fci[i].pointer_count = 1;
2634 i = find_char_info_specifier_index (diag_fci, 'K');
2635 diag_fci[i].types[0].type = &t;
2636 diag_fci[i].pointer_count = 1;
2639 /* Handle the __gcc_tdiag__ format specifics. */
2641 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2642 tdiag_fci = (format_char_info *)
2643 xmemdup (gcc_tdiag_char_table,
2644 sizeof (gcc_tdiag_char_table),
2645 sizeof (gcc_tdiag_char_table));
2648 i = find_char_info_specifier_index (tdiag_fci, 'H');
2649 tdiag_fci[i].types[0].type = &loc;
2650 tdiag_fci[i].pointer_count = 1;
2654 /* All specifiers taking a tree share the same struct. */
2655 i = find_char_info_specifier_index (tdiag_fci, 'D');
2656 tdiag_fci[i].types[0].type = &t;
2657 tdiag_fci[i].pointer_count = 1;
2658 i = find_char_info_specifier_index (tdiag_fci, 'J');
2659 tdiag_fci[i].types[0].type = &t;
2660 tdiag_fci[i].pointer_count = 1;
2661 i = find_char_info_specifier_index (tdiag_fci, 'K');
2662 tdiag_fci[i].types[0].type = &t;
2663 tdiag_fci[i].pointer_count = 1;
2666 /* Handle the __gcc_cdiag__ format specifics. */
2668 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2669 cdiag_fci = (format_char_info *)
2670 xmemdup (gcc_cdiag_char_table,
2671 sizeof (gcc_cdiag_char_table),
2672 sizeof (gcc_cdiag_char_table));
2675 i = find_char_info_specifier_index (cdiag_fci, 'H');
2676 cdiag_fci[i].types[0].type = &loc;
2677 cdiag_fci[i].pointer_count = 1;
2681 /* All specifiers taking a tree share the same struct. */
2682 i = find_char_info_specifier_index (cdiag_fci, 'D');
2683 cdiag_fci[i].types[0].type = &t;
2684 cdiag_fci[i].pointer_count = 1;
2685 i = find_char_info_specifier_index (cdiag_fci, 'J');
2686 cdiag_fci[i].types[0].type = &t;
2687 cdiag_fci[i].pointer_count = 1;
2688 i = find_char_info_specifier_index (cdiag_fci, 'K');
2689 cdiag_fci[i].types[0].type = &t;
2690 cdiag_fci[i].pointer_count = 1;
2693 /* Handle the __gcc_cxxdiag__ format specifics. */
2695 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2696 cxxdiag_fci = (format_char_info *)
2697 xmemdup (gcc_cxxdiag_char_table,
2698 sizeof (gcc_cxxdiag_char_table),
2699 sizeof (gcc_cxxdiag_char_table));
2702 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2703 cxxdiag_fci[i].types[0].type = &loc;
2704 cxxdiag_fci[i].pointer_count = 1;
2708 /* All specifiers taking a tree share the same struct. */
2709 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2710 cxxdiag_fci[i].types[0].type = &t;
2711 cxxdiag_fci[i].pointer_count = 1;
2712 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2713 cxxdiag_fci[i].types[0].type = &t;
2714 cxxdiag_fci[i].pointer_count = 1;
2715 i = find_char_info_specifier_index (cxxdiag_fci, 'K');
2716 cxxdiag_fci[i].types[0].type = &t;
2717 cxxdiag_fci[i].pointer_count = 1;
2722 #ifdef TARGET_FORMAT_TYPES
2723 extern const format_kind_info TARGET_FORMAT_TYPES[];
2726 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2727 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
2729 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2730 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
2733 /* Attributes such as "printf" are equivalent to those such as
2734 "gnu_printf" unless this is overridden by a target. */
2735 static const target_ovr_attr gnu_target_overrides_format_attributes[] =
2737 { "gnu_printf", "printf" },
2738 { "gnu_scanf", "scanf" },
2739 { "gnu_strftime", "strftime" },
2740 { "gnu_strfmon", "strfmon" },
2744 /* Translate to unified attribute name. This is used in decode_format_type and
2745 decode_format_attr. In attr_name the user specified argument is passed. It
2746 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2747 or the attr_name passed to this function, if there is no matching entry. */
2749 convert_format_name_to_system_name (const char *attr_name)
2753 if (attr_name == NULL || *attr_name == 0
2754 || strncmp (attr_name, "gcc_", 4) == 0)
2756 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2757 TARGET_OVERRIDES_FORMAT_INIT ();
2760 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2761 /* Check if format attribute is overridden by target. */
2762 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
2763 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
2765 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
2767 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
2770 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
2772 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
2776 /* Otherwise default to gnu format. */
2778 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
2781 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
2784 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
2786 return gnu_target_overrides_format_attributes[i].named_attr_src;
2792 /* Return true if TATTR_NAME and ATTR_NAME are the same format attribute,
2793 counting "name" and "__name__" as the same, false otherwise. */
2795 cmp_attribs (const char *tattr_name, const char *attr_name)
2797 int alen = strlen (attr_name);
2798 int slen = (tattr_name ? strlen (tattr_name) : 0);
2799 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_'
2800 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_')
2805 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0)
2810 /* Handle a "format" attribute; arguments as in
2811 struct attribute_spec.handler. */
2813 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2814 int flags, bool *no_add_attrs)
2817 function_format_info info;
2820 #ifdef TARGET_FORMAT_TYPES
2821 /* If the target provides additional format types, we need to
2822 add them to FORMAT_TYPES at first use. */
2823 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2825 dynamic_format_types = XNEWVEC (format_kind_info,
2826 n_format_types + TARGET_N_FORMAT_TYPES);
2827 memcpy (dynamic_format_types, format_types_orig,
2828 sizeof (format_types_orig));
2829 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2830 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2832 format_types = dynamic_format_types;
2833 n_format_types += TARGET_N_FORMAT_TYPES;
2837 if (!decode_format_attr (args, &info, 0))
2839 *no_add_attrs = true;
2843 argument = TYPE_ARG_TYPES (type);
2846 if (!check_format_string (argument, info.format_num, flags,
2850 if (info.first_arg_num != 0)
2852 unsigned HOST_WIDE_INT arg_num = 1;
2854 /* Verify that first_arg_num points to the last arg,
2857 arg_num++, argument = TREE_CHAIN (argument);
2859 if (arg_num != info.first_arg_num)
2861 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2862 error ("args to be formatted is not %<...%>");
2863 *no_add_attrs = true;
2869 /* Check if this is a strftime variant. Just for this variant
2870 FMT_FLAG_ARG_CONVERT is not set. */
2871 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
2872 && info.first_arg_num != 0)
2874 error ("strftime formats cannot format arguments");
2875 *no_add_attrs = true;
2879 /* If this is a custom GCC-internal format type, we have to
2880 initialize certain bits a runtime. */
2881 if (info.format_type == asm_fprintf_format_type
2882 || info.format_type == gcc_gfc_format_type
2883 || info.format_type == gcc_diag_format_type
2884 || info.format_type == gcc_tdiag_format_type
2885 || info.format_type == gcc_cdiag_format_type
2886 || info.format_type == gcc_cxxdiag_format_type)
2888 /* Our first time through, we have to make sure that our
2889 format_type data is allocated dynamically and is modifiable. */
2890 if (!dynamic_format_types)
2891 format_types = dynamic_format_types = (format_kind_info *)
2892 xmemdup (format_types_orig, sizeof (format_types_orig),
2893 sizeof (format_types_orig));
2895 /* If this is format __asm_fprintf__, we have to initialize
2896 GCC's notion of HOST_WIDE_INT for checking %wd. */
2897 if (info.format_type == asm_fprintf_format_type)
2898 init_dynamic_asm_fprintf_info ();
2899 /* If this is format __gcc_gfc__, we have to initialize GCC's
2900 notion of 'locus' at runtime for %L. */
2901 else if (info.format_type == gcc_gfc_format_type)
2902 init_dynamic_gfc_info ();
2903 /* If this is one of the diagnostic attributes, then we have to
2904 initialize 'location_t' and 'tree' at runtime. */
2905 else if (info.format_type == gcc_diag_format_type
2906 || info.format_type == gcc_tdiag_format_type
2907 || info.format_type == gcc_cdiag_format_type
2908 || info.format_type == gcc_cxxdiag_format_type)
2909 init_dynamic_diag_info ();