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 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
723 static const format_char_info monetary_char_table[] =
725 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
726 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
729 /* This must be in the same order as enum format_type. */
730 static const format_kind_info format_types_orig[] =
732 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
733 printf_flag_specs, printf_flag_pairs,
734 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
735 'w', 0, 'p', 0, 'L', 0,
736 &integer_type_node, &integer_type_node
738 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
739 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
740 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
741 'w', 0, 'p', 0, 'L', 0,
744 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
745 gcc_diag_flag_specs, gcc_diag_flag_pairs,
746 FMT_FLAG_ARG_CONVERT,
747 0, 0, 'p', 0, 'L', 0,
748 NULL, &integer_type_node
750 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
751 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
752 FMT_FLAG_ARG_CONVERT,
753 0, 0, 'p', 0, 'L', 0,
754 NULL, &integer_type_node
756 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
757 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
758 FMT_FLAG_ARG_CONVERT,
759 0, 0, 'p', 0, 'L', 0,
760 NULL, &integer_type_node
762 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
763 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
764 FMT_FLAG_ARG_CONVERT,
765 0, 0, 'p', 0, 'L', 0,
766 NULL, &integer_type_node
768 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL,
769 NULL, gcc_gfc_flag_pairs,
770 FMT_FLAG_ARG_CONVERT,
774 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
775 scanf_flag_specs, scanf_flag_pairs,
776 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
777 'w', 0, 0, '*', 'L', 'm',
780 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
781 strftime_flag_specs, strftime_flag_pairs,
782 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
785 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
786 strfmon_flag_specs, strfmon_flag_pairs,
787 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
792 /* This layer of indirection allows GCC to reassign format_types with
793 new data if necessary, while still allowing the original data to be
795 static const format_kind_info *format_types = format_types_orig;
796 /* We can modify this one. We also add target-specific format types
797 to the end of the array. */
798 static format_kind_info *dynamic_format_types;
800 static int n_format_types = ARRAY_SIZE (format_types_orig);
802 /* Structure detailing the results of checking a format function call
803 where the format expression may be a conditional expression with
804 many leaves resulting from nested conditional expressions. */
807 /* Number of leaves of the format argument that could not be checked
808 as they were not string literals. */
809 int number_non_literal;
810 /* Number of leaves of the format argument that were null pointers or
811 string literals, but had extra format arguments. */
812 int number_extra_args;
813 /* Number of leaves of the format argument that were null pointers or
814 string literals, but had extra format arguments and used $ operand
816 int number_dollar_extra_args;
817 /* Number of leaves of the format argument that were wide string
820 /* Number of leaves of the format argument that were empty strings. */
822 /* Number of leaves of the format argument that were unterminated
824 int number_unterminated;
825 /* Number of leaves of the format argument that were not counted above. */
827 } format_check_results;
831 format_check_results *res;
832 function_format_info *info;
834 } format_check_context;
836 static void check_format_info (function_format_info *, tree);
837 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
838 static void check_format_info_main (format_check_results *,
839 function_format_info *,
840 const char *, int, tree,
841 unsigned HOST_WIDE_INT, alloc_pool);
843 static void init_dollar_format_checking (int, tree);
844 static int maybe_read_dollar_number (const char **, int,
845 tree, tree *, const format_kind_info *);
846 static bool avoid_dollar_number (const char *);
847 static void finish_dollar_format_checking (format_check_results *, int);
849 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
852 static void check_format_types (format_wanted_type *, const char *, int);
853 static void format_type_warning (const char *, const char *, int, tree,
854 int, const char *, tree, int);
856 /* Decode a format type from a string, returning the type, or
857 format_type_error if not valid, in which case the caller should print an
860 decode_format_type (const char *s)
865 s = convert_format_name_to_system_name (s);
867 for (i = 0; i < n_format_types; i++)
870 if (!strcmp (s, format_types[i].name))
872 alen = strlen (format_types[i].name);
873 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
874 && s[slen - 1] == '_' && s[slen - 2] == '_'
875 && !strncmp (s + 2, format_types[i].name, alen))
878 return format_type_error;
882 /* Check the argument list of a call to printf, scanf, etc.
883 ATTRS are the attributes on the function type. There are NARGS argument
884 values in the array ARGARRAY.
885 Also, if -Wmissing-format-attribute,
886 warn for calls to vprintf or vscanf in functions with no such format
887 attribute themselves. */
890 check_function_format (tree attrs, int nargs, tree *argarray)
894 /* See if this function has any format attributes. */
895 for (a = attrs; a; a = TREE_CHAIN (a))
897 if (is_attribute_p ("format", TREE_PURPOSE (a)))
900 function_format_info info;
901 decode_format_attr (TREE_VALUE (a), &info, 1);
904 /* FIXME: Rewrite all the internal functions in this file
905 to use the ARGARRAY directly instead of constructing this
907 tree params = NULL_TREE;
909 for (i = nargs - 1; i >= 0; i--)
910 params = tree_cons (NULL_TREE, argarray[i], params);
911 check_format_info (&info, params);
913 if (warn_missing_format_attribute && info.first_arg_num == 0
914 && (format_types[info.format_type].flags
915 & (int) FMT_FLAG_ARG_CONVERT))
918 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
921 if (is_attribute_p ("format", TREE_PURPOSE (c))
922 && (decode_format_type (IDENTIFIER_POINTER
923 (TREE_VALUE (TREE_VALUE (c))))
924 == info.format_type))
928 /* Check if the current function has a parameter to which
929 the format attribute could be attached; if not, it
930 can't be a candidate for a format attribute, despite
931 the vprintf-like or vscanf-like call. */
933 for (args = DECL_ARGUMENTS (current_function_decl);
935 args = TREE_CHAIN (args))
937 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
938 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
943 warning (OPT_Wmissing_format_attribute, "function might "
944 "be possible candidate for %qs format attribute",
945 format_types[info.format_type].name);
953 /* Variables used by the checking of $ operand number formats. */
954 static char *dollar_arguments_used = NULL;
955 static char *dollar_arguments_pointer_p = NULL;
956 static int dollar_arguments_alloc = 0;
957 static int dollar_arguments_count;
958 static int dollar_first_arg_num;
959 static int dollar_max_arg_used;
960 static int dollar_format_warned;
962 /* Initialize the checking for a format string that may contain $
963 parameter number specifications; we will need to keep track of whether
964 each parameter has been used. FIRST_ARG_NUM is the number of the first
965 argument that is a parameter to the format, or 0 for a vprintf-style
966 function; PARAMS is the list of arguments starting at this argument. */
969 init_dollar_format_checking (int first_arg_num, tree params)
971 tree oparams = params;
973 dollar_first_arg_num = first_arg_num;
974 dollar_arguments_count = 0;
975 dollar_max_arg_used = 0;
976 dollar_format_warned = 0;
977 if (first_arg_num > 0)
981 dollar_arguments_count++;
982 params = TREE_CHAIN (params);
985 if (dollar_arguments_alloc < dollar_arguments_count)
987 if (dollar_arguments_used)
988 free (dollar_arguments_used);
989 if (dollar_arguments_pointer_p)
990 free (dollar_arguments_pointer_p);
991 dollar_arguments_alloc = dollar_arguments_count;
992 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
993 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
995 if (dollar_arguments_alloc)
997 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
998 if (first_arg_num > 0)
1004 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1006 params = TREE_CHAIN (params);
1014 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1015 is set, it is an error if one is not found; otherwise, it is OK. If
1016 such a number is found, check whether it is within range and mark that
1017 numbered operand as being used for later checking. Returns the operand
1018 number if found and within range, zero if no such number was found and
1019 this is OK, or -1 on error. PARAMS points to the first operand of the
1020 format; PARAM_PTR is made to point to the parameter referred to. If
1021 a $ format is found, *FORMAT is updated to point just after it. */
1024 maybe_read_dollar_number (const char **format,
1025 int dollar_needed, tree params, tree *param_ptr,
1026 const format_kind_info *fki)
1030 const char *fcp = *format;
1031 if (!ISDIGIT (*fcp))
1035 warning (OPT_Wformat, "missing $ operand number in format");
1043 while (ISDIGIT (*fcp))
1046 nargnum = 10 * argnum + (*fcp - '0');
1047 if (nargnum < 0 || nargnum / 10 != argnum)
1056 warning (OPT_Wformat, "missing $ operand number in format");
1063 if (pedantic && !dollar_format_warned)
1065 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1066 C_STD_NAME (STD_EXT));
1067 dollar_format_warned = 1;
1069 if (overflow_flag || argnum == 0
1070 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1072 warning (OPT_Wformat, "operand number out of range in format");
1075 if (argnum > dollar_max_arg_used)
1076 dollar_max_arg_used = argnum;
1077 /* For vprintf-style functions we may need to allocate more memory to
1078 track which arguments are used. */
1079 while (dollar_arguments_alloc < dollar_max_arg_used)
1082 nalloc = 2 * dollar_arguments_alloc + 16;
1083 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1085 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1087 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1088 nalloc - dollar_arguments_alloc);
1089 dollar_arguments_alloc = nalloc;
1091 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1092 && dollar_arguments_used[argnum - 1] == 1)
1094 dollar_arguments_used[argnum - 1] = 2;
1095 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1099 dollar_arguments_used[argnum - 1] = 1;
1100 if (dollar_first_arg_num)
1103 *param_ptr = params;
1104 for (i = 1; i < argnum && *param_ptr != 0; i++)
1105 *param_ptr = TREE_CHAIN (*param_ptr);
1107 /* This case shouldn't be caught here. */
1108 gcc_assert (*param_ptr);
1115 /* Ensure that FORMAT does not start with a decimal number followed by
1116 a $; give a diagnostic and return true if it does, false otherwise. */
1119 avoid_dollar_number (const char *format)
1121 if (!ISDIGIT (*format))
1123 while (ISDIGIT (*format))
1127 warning (OPT_Wformat, "$ operand number used after format without operand number");
1134 /* Finish the checking for a format string that used $ operand number formats
1135 instead of non-$ formats. We check for unused operands before used ones
1136 (a serious error, since the implementation of the format function
1137 can't know what types to pass to va_arg to find the later arguments).
1138 and for unused operands at the end of the format (if we know how many
1139 arguments the format had, so not for vprintf). If there were operand
1140 numbers out of range on a non-vprintf-style format, we won't have reached
1141 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1145 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1148 bool found_pointer_gap = false;
1149 for (i = 0; i < dollar_max_arg_used; i++)
1151 if (!dollar_arguments_used[i])
1153 if (pointer_gap_ok && (dollar_first_arg_num == 0
1154 || dollar_arguments_pointer_p[i]))
1155 found_pointer_gap = true;
1157 warning (OPT_Wformat,
1158 "format argument %d unused before used argument %d in $-style format",
1159 i + 1, dollar_max_arg_used);
1162 if (found_pointer_gap
1163 || (dollar_first_arg_num
1164 && dollar_max_arg_used < dollar_arguments_count))
1166 res->number_other--;
1167 res->number_dollar_extra_args++;
1172 /* Retrieve the specification for a format flag. SPEC contains the
1173 specifications for format flags for the applicable kind of format.
1174 FLAG is the flag in question. If PREDICATES is NULL, the basic
1175 spec for that flag must be retrieved and must exist. If
1176 PREDICATES is not NULL, it is a string listing possible predicates
1177 for the spec entry; if an entry predicated on any of these is
1178 found, it is returned, otherwise NULL is returned. */
1180 static const format_flag_spec *
1181 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1184 for (i = 0; spec[i].flag_char != 0; i++)
1186 if (spec[i].flag_char != flag)
1188 if (predicates != NULL)
1190 if (spec[i].predicate != 0
1191 && strchr (predicates, spec[i].predicate) != 0)
1194 else if (spec[i].predicate == 0)
1197 gcc_assert (predicates);
1202 /* Check the argument list of a call to printf, scanf, etc.
1203 INFO points to the function_format_info structure.
1204 PARAMS is the list of argument values. */
1207 check_format_info (function_format_info *info, tree params)
1209 format_check_context format_ctx;
1210 unsigned HOST_WIDE_INT arg_num;
1212 format_check_results res;
1213 /* Skip to format argument. If the argument isn't available, there's
1214 no work for us to do; prototype checking will catch the problem. */
1215 for (arg_num = 1; ; ++arg_num)
1219 if (arg_num == info->format_num)
1221 params = TREE_CHAIN (params);
1223 format_tree = TREE_VALUE (params);
1224 params = TREE_CHAIN (params);
1225 if (format_tree == 0)
1228 res.number_non_literal = 0;
1229 res.number_extra_args = 0;
1230 res.number_dollar_extra_args = 0;
1231 res.number_wide = 0;
1232 res.number_empty = 0;
1233 res.number_unterminated = 0;
1234 res.number_other = 0;
1236 format_ctx.res = &res;
1237 format_ctx.info = info;
1238 format_ctx.params = params;
1240 check_function_arguments_recurse (check_format_arg, &format_ctx,
1241 format_tree, arg_num);
1243 if (res.number_non_literal > 0)
1245 /* Functions taking a va_list normally pass a non-literal format
1246 string. These functions typically are declared with
1247 first_arg_num == 0, so avoid warning in those cases. */
1248 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1250 /* For strftime-like formats, warn for not checking the format
1251 string; but there are no arguments to check. */
1252 warning (OPT_Wformat_nonliteral,
1253 "format not a string literal, format string not checked");
1255 else if (info->first_arg_num != 0)
1257 /* If there are no arguments for the format at all, we may have
1258 printf (foo) which is likely to be a security hole. */
1259 while (arg_num + 1 < info->first_arg_num)
1263 params = TREE_CHAIN (params);
1266 if (params == 0 && warn_format_security)
1267 warning (OPT_Wformat_security,
1268 "format not a string literal and no format arguments");
1269 else if (params == 0 && warn_format_nonliteral)
1270 warning (OPT_Wformat_nonliteral,
1271 "format not a string literal and no format arguments");
1273 warning (OPT_Wformat_nonliteral,
1274 "format not a string literal, argument types not checked");
1278 /* If there were extra arguments to the format, normally warn. However,
1279 the standard does say extra arguments are ignored, so in the specific
1280 case where we have multiple leaves (conditional expressions or
1281 ngettext) allow extra arguments if at least one leaf didn't have extra
1282 arguments, but was otherwise OK (either non-literal or checked OK).
1283 If the format is an empty string, this should be counted similarly to the
1284 case of extra format arguments. */
1285 if (res.number_extra_args > 0 && res.number_non_literal == 0
1286 && res.number_other == 0)
1287 warning (OPT_Wformat_extra_args, "too many arguments for format");
1288 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1289 && res.number_other == 0)
1290 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1291 if (res.number_empty > 0 && res.number_non_literal == 0
1292 && res.number_other == 0)
1293 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1294 format_types[info->format_type].name);
1296 if (res.number_wide > 0)
1297 warning (OPT_Wformat, "format is a wide character string");
1299 if (res.number_unterminated > 0)
1300 warning (OPT_Wformat, "unterminated format string");
1303 /* Callback from check_function_arguments_recurse to check a
1304 format string. FORMAT_TREE is the format parameter. ARG_NUM
1305 is the number of the format argument. CTX points to a
1306 format_check_context. */
1309 check_format_arg (void *ctx, tree format_tree,
1310 unsigned HOST_WIDE_INT arg_num)
1312 format_check_context *format_ctx = (format_check_context *) ctx;
1313 format_check_results *res = format_ctx->res;
1314 function_format_info *info = format_ctx->info;
1315 tree params = format_ctx->params;
1318 HOST_WIDE_INT offset;
1319 const char *format_chars;
1320 tree array_size = 0;
1322 alloc_pool fwt_pool;
1324 if (integer_zerop (format_tree))
1326 /* Skip to first argument to check, so we can see if this format
1327 has any arguments (it shouldn't). */
1328 while (arg_num + 1 < info->first_arg_num)
1332 params = TREE_CHAIN (params);
1337 res->number_other++;
1339 res->number_extra_args++;
1345 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1349 arg0 = TREE_OPERAND (format_tree, 0);
1350 arg1 = TREE_OPERAND (format_tree, 1);
1353 if (TREE_CODE (arg1) == INTEGER_CST)
1357 res->number_non_literal++;
1360 if (!host_integerp (arg1, 0)
1361 || (offset = tree_low_cst (arg1, 0)) < 0)
1363 res->number_non_literal++;
1367 if (TREE_CODE (format_tree) != ADDR_EXPR)
1369 res->number_non_literal++;
1372 format_tree = TREE_OPERAND (format_tree, 0);
1373 if (TREE_CODE (format_tree) == ARRAY_REF
1374 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1375 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1376 format_tree = TREE_OPERAND (format_tree, 0);
1377 if (TREE_CODE (format_tree) == VAR_DECL
1378 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1379 && (array_init = decl_constant_value (format_tree)) != format_tree
1380 && TREE_CODE (array_init) == STRING_CST)
1382 /* Extract the string constant initializer. Note that this may include
1383 a trailing NUL character that is not in the array (e.g.
1384 const char a[3] = "foo";). */
1385 array_size = DECL_SIZE_UNIT (format_tree);
1386 format_tree = array_init;
1388 if (TREE_CODE (format_tree) != STRING_CST)
1390 res->number_non_literal++;
1393 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1398 format_chars = TREE_STRING_POINTER (format_tree);
1399 format_length = TREE_STRING_LENGTH (format_tree);
1400 if (array_size != 0)
1402 /* Variable length arrays can't be initialized. */
1403 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1405 if (host_integerp (array_size, 0))
1407 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1408 if (array_size_value > 0
1409 && array_size_value == (int) array_size_value
1410 && format_length > array_size_value)
1411 format_length = array_size_value;
1416 if (offset >= format_length)
1418 res->number_non_literal++;
1421 format_chars += offset;
1422 format_length -= offset;
1424 if (format_length < 1 || format_chars[--format_length] != 0)
1426 res->number_unterminated++;
1429 if (format_length == 0)
1431 res->number_empty++;
1435 /* Skip to first argument to check. */
1436 while (arg_num + 1 < info->first_arg_num)
1440 params = TREE_CHAIN (params);
1443 /* Provisionally increment res->number_other; check_format_info_main
1444 will decrement it if it finds there are extra arguments, but this way
1445 need not adjust it for every return. */
1446 res->number_other++;
1447 fwt_pool = create_alloc_pool ("format_wanted_type pool",
1448 sizeof (format_wanted_type), 10);
1449 check_format_info_main (res, info, format_chars, format_length,
1450 params, arg_num, fwt_pool);
1451 free_alloc_pool (fwt_pool);
1455 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1456 is the NUL-terminated format string (which at this point may contain
1457 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1458 terminating NUL character). ARG_NUM is one less than the number of
1459 the first format argument to check; PARAMS points to that format
1460 argument in the list of arguments. */
1463 check_format_info_main (format_check_results *res,
1464 function_format_info *info, const char *format_chars,
1465 int format_length, tree params,
1466 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool)
1468 const char *orig_format_chars = format_chars;
1469 tree first_fillin_param = params;
1471 const format_kind_info *fki = &format_types[info->format_type];
1472 const format_flag_spec *flag_specs = fki->flag_specs;
1473 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1475 /* -1 if no conversions taking an operand have been found; 0 if one has
1476 and it didn't use $; 1 if $ formats are in use. */
1477 int has_operand_number = -1;
1479 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1484 int suppressed = FALSE;
1485 const char *length_chars = NULL;
1486 enum format_lengths length_chars_val = FMT_LEN_none;
1487 enum format_std_version length_chars_std = STD_C89;
1491 int main_arg_num = 0;
1492 tree main_arg_params = 0;
1493 enum format_std_version wanted_type_std;
1494 const char *wanted_type_name;
1495 format_wanted_type width_wanted_type;
1496 format_wanted_type precision_wanted_type;
1497 format_wanted_type main_wanted_type;
1498 format_wanted_type *first_wanted_type = NULL;
1499 format_wanted_type *last_wanted_type = NULL;
1500 const format_length_info *fli = NULL;
1501 const format_char_info *fci = NULL;
1502 char flag_chars[256];
1504 const char *format_start = format_chars;
1505 if (*format_chars == 0)
1507 if (format_chars - orig_format_chars != format_length)
1508 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
1509 if (info->first_arg_num != 0 && params != 0
1510 && has_operand_number <= 0)
1512 res->number_other--;
1513 res->number_extra_args++;
1515 if (has_operand_number > 0)
1516 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1519 if (*format_chars++ != '%')
1521 if (*format_chars == 0)
1523 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1526 if (*format_chars == '%')
1533 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1535 /* Possibly read a $ operand number at the start of the format.
1536 If one was previously used, one is required here. If one
1537 is not used here, we can't immediately conclude this is a
1538 format without them, since it could be printf %m or scanf %*. */
1540 opnum = maybe_read_dollar_number (&format_chars, 0,
1542 &main_arg_params, fki);
1547 has_operand_number = 1;
1548 main_arg_num = opnum + info->first_arg_num - 1;
1551 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1553 if (avoid_dollar_number (format_chars))
1557 /* Read any format flags, but do not yet validate them beyond removing
1558 duplicates, since in general validation depends on the rest of
1560 while (*format_chars != 0
1561 && strchr (fki->flag_chars, *format_chars) != 0)
1563 const format_flag_spec *s = get_flag_spec (flag_specs,
1564 *format_chars, NULL);
1565 if (strchr (flag_chars, *format_chars) != 0)
1567 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1571 i = strlen (flag_chars);
1572 flag_chars[i++] = *format_chars;
1575 if (s->skip_next_char)
1578 if (*format_chars == 0)
1580 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1587 /* Read any format width, possibly * or *m$. */
1588 if (fki->width_char != 0)
1590 if (fki->width_type != NULL && *format_chars == '*')
1592 i = strlen (flag_chars);
1593 flag_chars[i++] = fki->width_char;
1595 /* "...a field width...may be indicated by an asterisk.
1596 In this case, an int argument supplies the field width..." */
1598 if (has_operand_number != 0)
1601 opnum = maybe_read_dollar_number (&format_chars,
1602 has_operand_number == 1,
1609 has_operand_number = 1;
1610 arg_num = opnum + info->first_arg_num - 1;
1613 has_operand_number = 0;
1617 if (avoid_dollar_number (format_chars))
1620 if (info->first_arg_num != 0)
1624 warning (OPT_Wformat, "too few arguments for format");
1627 cur_param = TREE_VALUE (params);
1628 if (has_operand_number <= 0)
1630 params = TREE_CHAIN (params);
1633 width_wanted_type.wanted_type = *fki->width_type;
1634 width_wanted_type.wanted_type_name = NULL;
1635 width_wanted_type.pointer_count = 0;
1636 width_wanted_type.char_lenient_flag = 0;
1637 width_wanted_type.writing_in_flag = 0;
1638 width_wanted_type.reading_from_flag = 0;
1639 width_wanted_type.name = _("field width");
1640 width_wanted_type.param = cur_param;
1641 width_wanted_type.arg_num = arg_num;
1642 width_wanted_type.next = NULL;
1643 if (last_wanted_type != 0)
1644 last_wanted_type->next = &width_wanted_type;
1645 if (first_wanted_type == 0)
1646 first_wanted_type = &width_wanted_type;
1647 last_wanted_type = &width_wanted_type;
1652 /* Possibly read a numeric width. If the width is zero,
1653 we complain if appropriate. */
1654 int non_zero_width_char = FALSE;
1655 int found_width = FALSE;
1656 while (ISDIGIT (*format_chars))
1659 if (*format_chars != '0')
1660 non_zero_width_char = TRUE;
1663 if (found_width && !non_zero_width_char &&
1664 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1665 warning (OPT_Wformat, "zero width in %s format", fki->name);
1668 i = strlen (flag_chars);
1669 flag_chars[i++] = fki->width_char;
1675 /* Read any format left precision (must be a number, not *). */
1676 if (fki->left_precision_char != 0 && *format_chars == '#')
1679 i = strlen (flag_chars);
1680 flag_chars[i++] = fki->left_precision_char;
1682 if (!ISDIGIT (*format_chars))
1683 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1684 while (ISDIGIT (*format_chars))
1688 /* Read any format precision, possibly * or *m$. */
1689 if (fki->precision_char != 0 && *format_chars == '.')
1692 i = strlen (flag_chars);
1693 flag_chars[i++] = fki->precision_char;
1695 if (fki->precision_type != NULL && *format_chars == '*')
1697 /* "...a...precision...may be indicated by an asterisk.
1698 In this case, an int argument supplies the...precision." */
1700 if (has_operand_number != 0)
1703 opnum = maybe_read_dollar_number (&format_chars,
1704 has_operand_number == 1,
1711 has_operand_number = 1;
1712 arg_num = opnum + info->first_arg_num - 1;
1715 has_operand_number = 0;
1719 if (avoid_dollar_number (format_chars))
1722 if (info->first_arg_num != 0)
1726 warning (OPT_Wformat, "too few arguments for format");
1729 cur_param = TREE_VALUE (params);
1730 if (has_operand_number <= 0)
1732 params = TREE_CHAIN (params);
1735 precision_wanted_type.wanted_type = *fki->precision_type;
1736 precision_wanted_type.wanted_type_name = NULL;
1737 precision_wanted_type.pointer_count = 0;
1738 precision_wanted_type.char_lenient_flag = 0;
1739 precision_wanted_type.writing_in_flag = 0;
1740 precision_wanted_type.reading_from_flag = 0;
1741 precision_wanted_type.name = _("field precision");
1742 precision_wanted_type.param = cur_param;
1743 precision_wanted_type.arg_num = arg_num;
1744 precision_wanted_type.next = NULL;
1745 if (last_wanted_type != 0)
1746 last_wanted_type->next = &precision_wanted_type;
1747 if (first_wanted_type == 0)
1748 first_wanted_type = &precision_wanted_type;
1749 last_wanted_type = &precision_wanted_type;
1754 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1755 && !ISDIGIT (*format_chars))
1756 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1757 while (ISDIGIT (*format_chars))
1762 if (fki->alloc_char && fki->alloc_char == *format_chars)
1764 i = strlen (flag_chars);
1765 flag_chars[i++] = fki->alloc_char;
1770 /* Handle the scanf allocation kludge. */
1771 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1773 if (*format_chars == 'a' && !flag_isoc99)
1775 if (format_chars[1] == 's' || format_chars[1] == 'S'
1776 || format_chars[1] == '[')
1778 /* 'a' is used as a flag. */
1779 i = strlen (flag_chars);
1780 flag_chars[i++] = 'a';
1787 /* Read any length modifier, if this kind of format has them. */
1788 fli = fki->length_char_specs;
1789 length_chars = NULL;
1790 length_chars_val = FMT_LEN_none;
1791 length_chars_std = STD_C89;
1794 while (fli->name != 0
1795 && strncmp (fli->name, format_chars, strlen (fli->name)))
1799 format_chars += strlen (fli->name);
1800 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1803 length_chars = fli->double_name;
1804 length_chars_val = fli->double_index;
1805 length_chars_std = fli->double_std;
1809 length_chars = fli->name;
1810 length_chars_val = fli->index;
1811 length_chars_std = fli->std;
1813 i = strlen (flag_chars);
1814 flag_chars[i++] = fki->length_code_char;
1819 /* Warn if the length modifier is non-standard. */
1820 if (ADJ_STD (length_chars_std) > C_STD_VER)
1821 warning (OPT_Wformat,
1822 "%s does not support the %qs %s length modifier",
1823 C_STD_NAME (length_chars_std), length_chars,
1828 /* Read any modifier (strftime E/O). */
1829 if (fki->modifier_chars != NULL)
1831 while (*format_chars != 0
1832 && strchr (fki->modifier_chars, *format_chars) != 0)
1834 if (strchr (flag_chars, *format_chars) != 0)
1836 const format_flag_spec *s = get_flag_spec (flag_specs,
1837 *format_chars, NULL);
1838 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1842 i = strlen (flag_chars);
1843 flag_chars[i++] = *format_chars;
1850 format_char = *format_chars;
1851 if (format_char == 0
1852 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1853 && format_char == '%'))
1855 warning (OPT_Wformat, "conversion lacks type at end of format");
1859 fci = fki->conversion_specs;
1860 while (fci->format_chars != 0
1861 && strchr (fci->format_chars, format_char) == 0)
1863 if (fci->format_chars == 0)
1865 if (ISGRAPH (format_char))
1866 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1869 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1875 if (ADJ_STD (fci->std) > C_STD_VER)
1876 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1877 C_STD_NAME (fci->std), format_char, fki->name);
1880 /* Validate the individual flags used, removing any that are invalid. */
1883 for (i = 0; flag_chars[i] != 0; i++)
1885 const format_flag_spec *s = get_flag_spec (flag_specs,
1886 flag_chars[i], NULL);
1887 flag_chars[i - d] = flag_chars[i];
1888 if (flag_chars[i] == fki->length_code_char)
1890 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1892 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1893 _(s->name), format_char, fki->name);
1899 const format_flag_spec *t;
1900 if (ADJ_STD (s->std) > C_STD_VER)
1901 warning (OPT_Wformat, "%s does not support %s",
1902 C_STD_NAME (s->std), _(s->long_name));
1903 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1904 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1906 const char *long_name = (t->long_name != NULL
1909 if (ADJ_STD (t->std) > C_STD_VER)
1910 warning (OPT_Wformat,
1911 "%s does not support %s with the %<%%%c%> %s format",
1912 C_STD_NAME (t->std), _(long_name),
1913 format_char, fki->name);
1917 flag_chars[i - d] = 0;
1920 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1921 && strchr (flag_chars, 'a') != 0)
1923 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0)
1926 if (fki->suppression_char
1927 && strchr (flag_chars, fki->suppression_char) != 0)
1930 /* Validate the pairs of flags used. */
1931 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1933 const format_flag_spec *s, *t;
1934 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1936 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1938 if (bad_flag_pairs[i].predicate != 0
1939 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1941 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1942 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1943 if (bad_flag_pairs[i].ignored)
1945 if (bad_flag_pairs[i].predicate != 0)
1946 warning (OPT_Wformat,
1947 "%s ignored with %s and %<%%%c%> %s format",
1948 _(s->name), _(t->name), format_char,
1951 warning (OPT_Wformat, "%s ignored with %s in %s format",
1952 _(s->name), _(t->name), fki->name);
1956 if (bad_flag_pairs[i].predicate != 0)
1957 warning (OPT_Wformat,
1958 "use of %s and %s together with %<%%%c%> %s format",
1959 _(s->name), _(t->name), format_char,
1962 warning (OPT_Wformat, "use of %s and %s together in %s format",
1963 _(s->name), _(t->name), fki->name);
1967 /* Give Y2K warnings. */
1968 if (warn_format_y2k)
1971 if (strchr (fci->flags2, '4') != 0)
1972 if (strchr (flag_chars, 'E') != 0)
1976 else if (strchr (fci->flags2, '3') != 0)
1978 else if (strchr (fci->flags2, '2') != 0)
1981 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1982 "year in some locales", format_char);
1983 else if (y2k_level == 2)
1984 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1985 "year", format_char);
1988 if (strchr (fci->flags2, '[') != 0)
1990 /* Skip over scan set, in case it happens to have '%' in it. */
1991 if (*format_chars == '^')
1993 /* Find closing bracket; if one is hit immediately, then
1994 it's part of the scan set rather than a terminator. */
1995 if (*format_chars == ']')
1997 while (*format_chars && *format_chars != ']')
1999 if (*format_chars != ']')
2000 /* The end of the format string was reached. */
2001 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
2005 wanted_type_name = 0;
2006 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
2008 wanted_type = (fci->types[length_chars_val].type
2009 ? *fci->types[length_chars_val].type : 0);
2010 wanted_type_name = fci->types[length_chars_val].name;
2011 wanted_type_std = fci->types[length_chars_val].std;
2012 if (wanted_type == 0)
2014 warning (OPT_Wformat,
2015 "use of %qs length modifier with %qc type character",
2016 length_chars, format_char);
2017 /* Heuristic: skip one argument when an invalid length/type
2018 combination is encountered. */
2022 warning (OPT_Wformat, "too few arguments for format");
2025 params = TREE_CHAIN (params);
2029 /* Warn if non-standard, provided it is more non-standard
2030 than the length and type characters that may already
2031 have been warned for. */
2032 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2033 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2035 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2036 warning (OPT_Wformat,
2037 "%s does not support the %<%%%s%c%> %s format",
2038 C_STD_NAME (wanted_type_std), length_chars,
2039 format_char, fki->name);
2043 main_wanted_type.next = NULL;
2045 /* Finally. . .check type of argument against desired type! */
2046 if (info->first_arg_num == 0)
2048 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2051 if (main_arg_num != 0)
2054 warning (OPT_Wformat, "operand number specified with "
2055 "suppressed assignment");
2057 warning (OPT_Wformat, "operand number specified for format "
2058 "taking no argument");
2063 format_wanted_type *wanted_type_ptr;
2065 if (main_arg_num != 0)
2067 arg_num = main_arg_num;
2068 params = main_arg_params;
2073 if (has_operand_number > 0)
2075 warning (OPT_Wformat, "missing $ operand number in format");
2079 has_operand_number = 0;
2082 wanted_type_ptr = &main_wanted_type;
2087 warning (OPT_Wformat, "too few arguments for format");
2091 cur_param = TREE_VALUE (params);
2092 params = TREE_CHAIN (params);
2094 wanted_type_ptr->wanted_type = wanted_type;
2095 wanted_type_ptr->wanted_type_name = wanted_type_name;
2096 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2097 wanted_type_ptr->char_lenient_flag = 0;
2098 if (strchr (fci->flags2, 'c') != 0)
2099 wanted_type_ptr->char_lenient_flag = 1;
2100 wanted_type_ptr->writing_in_flag = 0;
2101 wanted_type_ptr->reading_from_flag = 0;
2103 wanted_type_ptr->writing_in_flag = 1;
2106 if (strchr (fci->flags2, 'W') != 0)
2107 wanted_type_ptr->writing_in_flag = 1;
2108 if (strchr (fci->flags2, 'R') != 0)
2109 wanted_type_ptr->reading_from_flag = 1;
2111 wanted_type_ptr->name = NULL;
2112 wanted_type_ptr->param = cur_param;
2113 wanted_type_ptr->arg_num = arg_num;
2114 wanted_type_ptr->next = NULL;
2115 if (last_wanted_type != 0)
2116 last_wanted_type->next = wanted_type_ptr;
2117 if (first_wanted_type == 0)
2118 first_wanted_type = wanted_type_ptr;
2119 last_wanted_type = wanted_type_ptr;
2124 wanted_type_ptr = (format_wanted_type *)
2125 pool_alloc (fwt_pool);
2127 wanted_type = *fci->types[length_chars_val].type;
2128 wanted_type_name = fci->types[length_chars_val].name;
2133 if (first_wanted_type != 0)
2134 check_format_types (first_wanted_type, format_start,
2135 format_chars - format_start);
2140 /* Check the argument types from a single format conversion (possibly
2141 including width and precision arguments). */
2143 check_format_types (format_wanted_type *types, const char *format_start,
2146 for (; types != 0; types = types->next)
2155 cur_param = types->param;
2156 cur_type = TREE_TYPE (cur_param);
2157 if (cur_type == error_mark_node)
2159 orig_cur_type = cur_type;
2161 wanted_type = types->wanted_type;
2162 arg_num = types->arg_num;
2164 /* The following should not occur here. */
2165 gcc_assert (wanted_type);
2166 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2168 if (types->pointer_count == 0)
2169 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2171 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2173 STRIP_NOPS (cur_param);
2175 /* Check the types of any additional pointer arguments
2176 that precede the "real" argument. */
2177 for (i = 0; i < types->pointer_count; ++i)
2179 if (TREE_CODE (cur_type) == POINTER_TYPE)
2181 cur_type = TREE_TYPE (cur_type);
2182 if (cur_type == error_mark_node)
2185 /* Check for writing through a NULL pointer. */
2186 if (types->writing_in_flag
2189 && integer_zerop (cur_param))
2190 warning (OPT_Wformat, "writing through null pointer "
2191 "(argument %d)", arg_num);
2193 /* Check for reading through a NULL pointer. */
2194 if (types->reading_from_flag
2197 && integer_zerop (cur_param))
2198 warning (OPT_Wformat, "reading through null pointer "
2199 "(argument %d)", arg_num);
2201 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2202 cur_param = TREE_OPERAND (cur_param, 0);
2206 /* See if this is an attempt to write into a const type with
2207 scanf or with printf "%n". Note: the writing in happens
2208 at the first indirection only, if for example
2209 void * const * is passed to scanf %p; passing
2210 const void ** is simply passing an incompatible type. */
2211 if (types->writing_in_flag
2213 && (TYPE_READONLY (cur_type)
2215 && (CONSTANT_CLASS_P (cur_param)
2216 || (DECL_P (cur_param)
2217 && TREE_READONLY (cur_param))))))
2218 warning (OPT_Wformat, "writing into constant object "
2219 "(argument %d)", arg_num);
2221 /* If there are extra type qualifiers beyond the first
2222 indirection, then this makes the types technically
2226 && (TYPE_READONLY (cur_type)
2227 || TYPE_VOLATILE (cur_type)
2228 || TYPE_RESTRICT (cur_type)))
2229 warning (OPT_Wformat, "extra type qualifiers in format "
2230 "argument (argument %d)",
2236 format_type_warning (types->name, format_start, format_length,
2237 wanted_type, types->pointer_count,
2238 types->wanted_type_name, orig_cur_type,
2244 if (i < types->pointer_count)
2247 cur_type = TYPE_MAIN_VARIANT (cur_type);
2249 /* Check whether the argument type is a character type. This leniency
2250 only applies to certain formats, flagged with 'c'.
2252 if (types->char_lenient_flag)
2253 char_type_flag = (cur_type == char_type_node
2254 || cur_type == signed_char_type_node
2255 || cur_type == unsigned_char_type_node);
2257 /* Check the type of the "real" argument, if there's a type we want. */
2258 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2260 /* If we want 'void *', allow any pointer type.
2261 (Anything else would already have got a warning.)
2262 With -pedantic, only allow pointers to void and to character
2264 if (wanted_type == void_type_node
2265 && (!pedantic || (i == 1 && char_type_flag)))
2267 /* Don't warn about differences merely in signedness, unless
2268 -pedantic. With -pedantic, warn if the type is a pointer
2269 target and not a character type, and for character types at
2270 a second level of indirection. */
2271 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2272 && TREE_CODE (cur_type) == INTEGER_TYPE
2273 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2274 && (TYPE_UNSIGNED (wanted_type)
2275 ? wanted_type == c_common_unsigned_type (cur_type)
2276 : wanted_type == c_common_signed_type (cur_type)))
2278 /* Likewise, "signed char", "unsigned char" and "char" are
2279 equivalent but the above test won't consider them equivalent. */
2280 if (wanted_type == char_type_node
2281 && (!pedantic || i < 2)
2284 /* Now we have a type mismatch. */
2285 format_type_warning (types->name, format_start, format_length,
2286 wanted_type, types->pointer_count,
2287 types->wanted_type_name, orig_cur_type, arg_num);
2292 /* Give a warning about a format argument of different type from that
2293 expected. DESCR is a description such as "field precision", or
2294 NULL for an ordinary format. For an ordinary format, FORMAT_START
2295 points to where the format starts in the format string and
2296 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2297 should have after POINTER_COUNT pointer dereferences.
2298 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2299 or NULL if the ordinary name of the type should be used. ARG_TYPE
2300 is the type of the actual argument. ARG_NUM is the number of that
2303 format_type_warning (const char *descr, const char *format_start,
2304 int format_length, tree wanted_type, int pointer_count,
2305 const char *wanted_type_name, tree arg_type, int arg_num)
2308 /* If ARG_TYPE is a typedef with a misleading name (for example,
2309 size_t but not the standard size_t expected by printf %zu), avoid
2310 printing the typedef name. */
2311 if (wanted_type_name
2312 && TYPE_NAME (arg_type)
2313 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2314 && DECL_NAME (TYPE_NAME (arg_type))
2315 && !strcmp (wanted_type_name,
2316 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2317 arg_type = TYPE_MAIN_VARIANT (arg_type);
2318 /* The format type and name exclude any '*' for pointers, so those
2319 must be formatted manually. For all the types we currently have,
2320 this is adequate, but formats taking pointers to functions or
2321 arrays would require the full type to be built up in order to
2322 print it with %T. */
2323 p = (char *) alloca (pointer_count + 2);
2324 if (pointer_count == 0)
2326 else if (c_dialect_cxx ())
2328 memset (p, '*', pointer_count);
2329 p[pointer_count] = 0;
2334 memset (p + 1, '*', pointer_count);
2335 p[pointer_count + 1] = 0;
2337 if (wanted_type_name)
2340 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2341 "but argument %d has type %qT",
2342 descr, wanted_type_name, p, arg_num, arg_type);
2344 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2345 "but argument %d has type %qT",
2346 format_length, format_start, wanted_type_name, p,
2352 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2353 "but argument %d has type %qT",
2354 descr, wanted_type, p, arg_num, arg_type);
2356 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2357 "but argument %d has type %qT",
2358 format_length, format_start, wanted_type, p, arg_num, arg_type);
2363 /* Given a format_char_info array FCI, and a character C, this function
2364 returns the index into the conversion_specs where that specifier's
2365 data is located. The character must exist. */
2367 find_char_info_specifier_index (const format_char_info *fci, int c)
2371 for (i = 0; fci->format_chars; i++, fci++)
2372 if (strchr (fci->format_chars, c))
2375 /* We shouldn't be looking for a non-existent specifier. */
2379 /* Given a format_length_info array FLI, and a character C, this
2380 function returns the index into the conversion_specs where that
2381 modifier's data is located. The character must exist. */
2383 find_length_info_modifier_index (const format_length_info *fli, int c)
2387 for (i = 0; fli->name; i++, fli++)
2388 if (strchr (fli->name, c))
2391 /* We shouldn't be looking for a non-existent modifier. */
2395 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2396 use in GCC's __asm_fprintf__ custom format attribute. You must
2397 have set dynamic_format_types before calling this function. */
2399 init_dynamic_asm_fprintf_info (void)
2405 format_length_info *new_asm_fprintf_length_specs;
2408 /* Find the underlying type for HOST_WIDE_INT. For the %w
2409 length modifier to work, one must have issued: "typedef
2410 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2411 prior to using that modifier. */
2412 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2415 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2418 hwi = identifier_global_value (hwi);
2419 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2421 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2424 hwi = DECL_ORIGINAL_TYPE (hwi);
2426 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2428 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2429 " or %<long long%>");
2433 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2434 new_asm_fprintf_length_specs = (format_length_info *)
2435 xmemdup (asm_fprintf_length_specs,
2436 sizeof (asm_fprintf_length_specs),
2437 sizeof (asm_fprintf_length_specs));
2439 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2440 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2441 if (hwi == long_integer_type_node)
2442 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2443 else if (hwi == long_long_integer_type_node)
2444 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2448 /* Assign the new data for use. */
2449 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2450 new_asm_fprintf_length_specs;
2454 /* Determine the type of a "locus" in the code being compiled for use
2455 in GCC's __gcc_gfc__ custom format attribute. You must have set
2456 dynamic_format_types before calling this function. */
2458 init_dynamic_gfc_info (void)
2464 static format_char_info *gfc_fci;
2466 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2467 must have declared 'locus' prior to using this attribute. If
2468 we haven't seen this declarations then you shouldn't use the
2469 specifier requiring that type. */
2470 if ((locus = maybe_get_identifier ("locus")))
2472 locus = identifier_global_value (locus);
2475 if (TREE_CODE (locus) != TYPE_DECL
2476 || TREE_TYPE (locus) == error_mark_node)
2478 error ("%<locus%> is not defined as a type");
2482 locus = TREE_TYPE (locus);
2486 /* Assign the new data for use. */
2488 /* Handle the __gcc_gfc__ format specifics. */
2490 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2491 gfc_fci = (format_char_info *)
2492 xmemdup (gcc_gfc_char_table,
2493 sizeof (gcc_gfc_char_table),
2494 sizeof (gcc_gfc_char_table));
2497 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2498 gfc_fci[i].types[0].type = &locus;
2499 gfc_fci[i].pointer_count = 1;
2504 /* Determine the types of "tree" and "location_t" in the code being
2505 compiled for use in GCC's diagnostic custom format attributes. You
2506 must have set dynamic_format_types before calling this function. */
2508 init_dynamic_diag_info (void)
2510 static tree t, loc, hwi;
2512 if (!loc || !t || !hwi)
2514 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2515 static format_length_info *diag_ls;
2518 /* For the GCC-diagnostics custom format specifiers to work, one
2519 must have declared 'tree' and/or 'location_t' prior to using
2520 those attributes. If we haven't seen these declarations then
2521 you shouldn't use the specifiers requiring these types.
2522 However we don't force a hard ICE because we may see only one
2523 or the other type. */
2524 if ((loc = maybe_get_identifier ("location_t")))
2526 loc = identifier_global_value (loc);
2529 if (TREE_CODE (loc) != TYPE_DECL)
2531 error ("%<location_t%> is not defined as a type");
2535 loc = TREE_TYPE (loc);
2539 /* We need to grab the underlying 'union tree_node' so peek into
2540 an extra type level. */
2541 if ((t = maybe_get_identifier ("tree")))
2543 t = identifier_global_value (t);
2546 if (TREE_CODE (t) != TYPE_DECL)
2548 error ("%<tree%> is not defined as a type");
2551 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2553 error ("%<tree%> is not defined as a pointer type");
2557 t = TREE_TYPE (TREE_TYPE (t));
2561 /* Find the underlying type for HOST_WIDE_INT. For the %w
2562 length modifier to work, one must have issued: "typedef
2563 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2564 prior to using that modifier. */
2565 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2567 hwi = identifier_global_value (hwi);
2570 if (TREE_CODE (hwi) != TYPE_DECL)
2572 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2577 hwi = DECL_ORIGINAL_TYPE (hwi);
2579 if (hwi != long_integer_type_node
2580 && hwi != long_long_integer_type_node)
2582 error ("%<__gcc_host_wide_int__%> is not defined"
2583 " as %<long%> or %<long long%>");
2590 /* Assign the new data for use. */
2592 /* All the GCC diag formats use the same length specs. */
2594 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2595 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2596 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2597 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2598 diag_ls = (format_length_info *)
2599 xmemdup (gcc_diag_length_specs,
2600 sizeof (gcc_diag_length_specs),
2601 sizeof (gcc_diag_length_specs));
2604 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2605 i = find_length_info_modifier_index (diag_ls, 'w');
2606 if (hwi == long_integer_type_node)
2607 diag_ls[i].index = FMT_LEN_l;
2608 else if (hwi == long_long_integer_type_node)
2609 diag_ls[i].index = FMT_LEN_ll;
2614 /* Handle the __gcc_diag__ format specifics. */
2616 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2617 diag_fci = (format_char_info *)
2618 xmemdup (gcc_diag_char_table,
2619 sizeof (gcc_diag_char_table),
2620 sizeof (gcc_diag_char_table));
2623 i = find_char_info_specifier_index (diag_fci, 'H');
2624 diag_fci[i].types[0].type = &loc;
2625 diag_fci[i].pointer_count = 1;
2629 i = find_char_info_specifier_index (diag_fci, 'J');
2630 diag_fci[i].types[0].type = &t;
2631 diag_fci[i].pointer_count = 1;
2632 i = find_char_info_specifier_index (diag_fci, 'K');
2633 diag_fci[i].types[0].type = &t;
2634 diag_fci[i].pointer_count = 1;
2637 /* Handle the __gcc_tdiag__ format specifics. */
2639 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2640 tdiag_fci = (format_char_info *)
2641 xmemdup (gcc_tdiag_char_table,
2642 sizeof (gcc_tdiag_char_table),
2643 sizeof (gcc_tdiag_char_table));
2646 i = find_char_info_specifier_index (tdiag_fci, 'H');
2647 tdiag_fci[i].types[0].type = &loc;
2648 tdiag_fci[i].pointer_count = 1;
2652 /* All specifiers taking a tree share the same struct. */
2653 i = find_char_info_specifier_index (tdiag_fci, 'D');
2654 tdiag_fci[i].types[0].type = &t;
2655 tdiag_fci[i].pointer_count = 1;
2656 i = find_char_info_specifier_index (tdiag_fci, 'J');
2657 tdiag_fci[i].types[0].type = &t;
2658 tdiag_fci[i].pointer_count = 1;
2659 i = find_char_info_specifier_index (tdiag_fci, 'K');
2660 tdiag_fci[i].types[0].type = &t;
2661 tdiag_fci[i].pointer_count = 1;
2664 /* Handle the __gcc_cdiag__ format specifics. */
2666 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2667 cdiag_fci = (format_char_info *)
2668 xmemdup (gcc_cdiag_char_table,
2669 sizeof (gcc_cdiag_char_table),
2670 sizeof (gcc_cdiag_char_table));
2673 i = find_char_info_specifier_index (cdiag_fci, 'H');
2674 cdiag_fci[i].types[0].type = &loc;
2675 cdiag_fci[i].pointer_count = 1;
2679 /* All specifiers taking a tree share the same struct. */
2680 i = find_char_info_specifier_index (cdiag_fci, 'D');
2681 cdiag_fci[i].types[0].type = &t;
2682 cdiag_fci[i].pointer_count = 1;
2683 i = find_char_info_specifier_index (cdiag_fci, 'J');
2684 cdiag_fci[i].types[0].type = &t;
2685 cdiag_fci[i].pointer_count = 1;
2686 i = find_char_info_specifier_index (cdiag_fci, 'K');
2687 cdiag_fci[i].types[0].type = &t;
2688 cdiag_fci[i].pointer_count = 1;
2691 /* Handle the __gcc_cxxdiag__ format specifics. */
2693 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2694 cxxdiag_fci = (format_char_info *)
2695 xmemdup (gcc_cxxdiag_char_table,
2696 sizeof (gcc_cxxdiag_char_table),
2697 sizeof (gcc_cxxdiag_char_table));
2700 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2701 cxxdiag_fci[i].types[0].type = &loc;
2702 cxxdiag_fci[i].pointer_count = 1;
2706 /* All specifiers taking a tree share the same struct. */
2707 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2708 cxxdiag_fci[i].types[0].type = &t;
2709 cxxdiag_fci[i].pointer_count = 1;
2710 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2711 cxxdiag_fci[i].types[0].type = &t;
2712 cxxdiag_fci[i].pointer_count = 1;
2713 i = find_char_info_specifier_index (cxxdiag_fci, 'K');
2714 cxxdiag_fci[i].types[0].type = &t;
2715 cxxdiag_fci[i].pointer_count = 1;
2720 #ifdef TARGET_FORMAT_TYPES
2721 extern const format_kind_info TARGET_FORMAT_TYPES[];
2724 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2725 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
2727 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2728 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
2731 /* Attributes such as "printf" are equivalent to those such as
2732 "gnu_printf" unless this is overridden by a target. */
2733 static const target_ovr_attr gnu_target_overrides_format_attributes[] =
2735 { "gnu_printf", "printf" },
2736 { "gnu_scanf", "scanf" },
2737 { "gnu_strftime", "strftime" },
2738 { "gnu_strfmon", "strfmon" },
2742 /* Translate to unified attribute name. This is used in decode_format_type and
2743 decode_format_attr. In attr_name the user specified argument is passed. It
2744 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2745 or the attr_name passed to this function, if there is no matching entry. */
2747 convert_format_name_to_system_name (const char *attr_name)
2751 if (attr_name == NULL || *attr_name == 0
2752 || strncmp (attr_name, "gcc_", 4) == 0)
2754 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2755 TARGET_OVERRIDES_FORMAT_INIT ();
2758 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2759 /* Check if format attribute is overridden by target. */
2760 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
2761 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
2763 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
2765 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
2768 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
2770 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
2774 /* Otherwise default to gnu format. */
2776 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
2779 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
2782 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
2784 return gnu_target_overrides_format_attributes[i].named_attr_src;
2790 /* Return true if TATTR_NAME and ATTR_NAME are the same format attribute,
2791 counting "name" and "__name__" as the same, false otherwise. */
2793 cmp_attribs (const char *tattr_name, const char *attr_name)
2795 int alen = strlen (attr_name);
2796 int slen = (tattr_name ? strlen (tattr_name) : 0);
2797 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_'
2798 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_')
2803 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0)
2808 /* Handle a "format" attribute; arguments as in
2809 struct attribute_spec.handler. */
2811 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2812 int flags, bool *no_add_attrs)
2815 function_format_info info;
2818 #ifdef TARGET_FORMAT_TYPES
2819 /* If the target provides additional format types, we need to
2820 add them to FORMAT_TYPES at first use. */
2821 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2823 dynamic_format_types = XNEWVEC (format_kind_info,
2824 n_format_types + TARGET_N_FORMAT_TYPES);
2825 memcpy (dynamic_format_types, format_types_orig,
2826 sizeof (format_types_orig));
2827 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2828 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2830 format_types = dynamic_format_types;
2831 n_format_types += TARGET_N_FORMAT_TYPES;
2835 if (!decode_format_attr (args, &info, 0))
2837 *no_add_attrs = true;
2841 argument = TYPE_ARG_TYPES (type);
2844 if (!check_format_string (argument, info.format_num, flags,
2848 if (info.first_arg_num != 0)
2850 unsigned HOST_WIDE_INT arg_num = 1;
2852 /* Verify that first_arg_num points to the last arg,
2855 arg_num++, argument = TREE_CHAIN (argument);
2857 if (arg_num != info.first_arg_num)
2859 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2860 error ("args to be formatted is not %<...%>");
2861 *no_add_attrs = true;
2867 /* Check if this is a strftime variant. Just for this variant
2868 FMT_FLAG_ARG_CONVERT is not set. */
2869 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
2870 && info.first_arg_num != 0)
2872 error ("strftime formats cannot format arguments");
2873 *no_add_attrs = true;
2877 /* If this is a custom GCC-internal format type, we have to
2878 initialize certain bits a runtime. */
2879 if (info.format_type == asm_fprintf_format_type
2880 || info.format_type == gcc_gfc_format_type
2881 || info.format_type == gcc_diag_format_type
2882 || info.format_type == gcc_tdiag_format_type
2883 || info.format_type == gcc_cdiag_format_type
2884 || info.format_type == gcc_cxxdiag_format_type)
2886 /* Our first time through, we have to make sure that our
2887 format_type data is allocated dynamically and is modifiable. */
2888 if (!dynamic_format_types)
2889 format_types = dynamic_format_types = (format_kind_info *)
2890 xmemdup (format_types_orig, sizeof (format_types_orig),
2891 sizeof (format_types_orig));
2893 /* If this is format __asm_fprintf__, we have to initialize
2894 GCC's notion of HOST_WIDE_INT for checking %wd. */
2895 if (info.format_type == asm_fprintf_format_type)
2896 init_dynamic_asm_fprintf_info ();
2897 /* If this is format __gcc_gfc__, we have to initialize GCC's
2898 notion of 'locus' at runtime for %L. */
2899 else if (info.format_type == gcc_gfc_format_type)
2900 init_dynamic_gfc_info ();
2901 /* If this is one of the diagnostic attributes, then we have to
2902 initialize 'location_t' and 'tree' at runtime. */
2903 else if (info.format_type == gcc_diag_format_type
2904 || info.format_type == gcc_tdiag_format_type
2905 || info.format_type == gcc_cdiag_format_type
2906 || info.format_type == gcc_cxxdiag_format_type)
2907 init_dynamic_diag_info ();