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 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 2, 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 COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 #include "coretypes.h"
31 #include "diagnostic.h"
32 #include "langhooks.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;
45 warn_format_nonliteral = setting;
46 warn_format_security = setting;
47 warn_format_y2k = setting;
49 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */
51 warn_nonnull = setting;
55 /* Handle attributes associated with format checking. */
57 /* This must be in the same order as format_types, except for
58 format_type_error. Target-specific format types do not have
59 matching enum values. */
60 enum format_type { printf_format_type, asm_fprintf_format_type,
61 gcc_diag_format_type, gcc_tdiag_format_type,
62 gcc_cdiag_format_type,
63 gcc_cxxdiag_format_type, gcc_gfc_format_type,
64 scanf_format_type, strftime_format_type,
65 strfmon_format_type, 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,
84 /* Handle a "format_arg" attribute; arguments as in
85 struct attribute_spec.handler. */
87 handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
88 tree args, int flags, bool *no_add_attrs)
91 tree format_num_expr = TREE_VALUE (args);
92 unsigned HOST_WIDE_INT format_num = 0;
95 if (!get_constant (format_num_expr, &format_num, 0))
97 error ("format string has invalid operand number");
102 argument = TYPE_ARG_TYPES (type);
105 if (!check_format_string (argument, format_num, flags, no_add_attrs))
109 if (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
110 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
113 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
114 error ("function does not return string type");
115 *no_add_attrs = true;
122 /* Verify that the format_num argument is actually a string, in case
123 the format attribute is in error. */
125 check_format_string (tree argument, unsigned HOST_WIDE_INT format_num,
126 int flags, bool *no_add_attrs)
128 unsigned HOST_WIDE_INT i;
130 for (i = 1; i != format_num; i++)
134 argument = TREE_CHAIN (argument);
138 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
139 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
142 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
143 error ("format string argument not a string type");
144 *no_add_attrs = true;
151 /* Verify EXPR is a constant, and store its value.
152 If validated_p is true there should be no errors.
153 Returns true on success, false otherwise. */
155 get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
157 if (TREE_CODE (expr) != INTEGER_CST || TREE_INT_CST_HIGH (expr) != 0)
159 gcc_assert (!validated_p);
163 *value = TREE_INT_CST_LOW (expr);
168 /* Decode the arguments to a "format" attribute into a
169 function_format_info structure. It is already known that the list
170 is of the right length. If VALIDATED_P is true, then these
171 attributes have already been validated and must not be erroneous;
172 if false, it will give an error message. Returns true if the
173 attributes are successfully decoded, false otherwise. */
176 decode_format_attr (tree args, function_format_info *info, int validated_p)
178 tree format_type_id = TREE_VALUE (args);
179 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
180 tree first_arg_num_expr
181 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
183 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
185 gcc_assert (!validated_p);
186 error ("unrecognized format specifier");
191 const char *p = IDENTIFIER_POINTER (format_type_id);
193 info->format_type = decode_format_type (p);
195 if (info->format_type == format_type_error)
197 gcc_assert (!validated_p);
198 warning (OPT_Wformat, "%qE is an unrecognized format function type",
204 if (!get_constant (format_num_expr, &info->format_num, validated_p))
206 error ("format string has invalid operand number");
210 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
212 error ("%<...%> has invalid operand number");
216 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
218 gcc_assert (!validated_p);
219 error ("format string argument follows the args to be formatted");
226 /* Check a call to a format function against a parameter list. */
228 /* The C standard version C++ is treated as equivalent to
229 or inheriting from, for the purpose of format features supported. */
230 #define CPLUSPLUS_STD_VER STD_C94
231 /* The C standard version we are checking formats against when pedantic. */
232 #define C_STD_VER ((int) (c_dialect_cxx () \
233 ? CPLUSPLUS_STD_VER \
236 : (flag_isoc94 ? STD_C94 : STD_C89))))
237 /* The name to give to the standard version we are warning about when
238 pedantic. FEATURE_VER is the version in which the feature warned out
239 appeared, which is higher than C_STD_VER. */
240 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
242 : ((FEATURE_VER) == STD_EXT \
245 /* Adjust a C standard version, which may be STD_C9L, to account for
246 -Wno-long-long. Returns other standard versions unchanged. */
247 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
248 ? (warn_long_long ? STD_C99 : STD_C89) \
251 /* Structure describing details of a type expected in format checking,
252 and the type to check against it. */
253 typedef struct format_wanted_type
255 /* The type wanted. */
257 /* The name of this type to use in diagnostics. */
258 const char *wanted_type_name;
259 /* The level of indirection through pointers at which this type occurs. */
261 /* Whether, when pointer_count is 1, to allow any character type when
262 pedantic, rather than just the character or void type specified. */
263 int char_lenient_flag;
264 /* Whether the argument, dereferenced once, is written into and so the
265 argument must not be a pointer to a const-qualified type. */
267 /* Whether the argument, dereferenced once, is read from and so
268 must not be a NULL pointer. */
269 int reading_from_flag;
270 /* If warnings should be of the form "field precision should have
271 type 'int'", the name to use (in this case "field precision"),
272 otherwise NULL, for "format expects type 'long'" type
275 /* The actual parameter to check against the wanted type. */
277 /* The argument number of that parameter. */
279 /* The next type to check for this format conversion, or NULL if none. */
280 struct format_wanted_type *next;
281 } format_wanted_type;
284 static const format_length_info printf_length_specs[] =
286 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
287 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
288 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
289 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
290 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
291 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
292 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
293 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
294 { NULL, 0, 0, NULL, 0, 0 }
297 /* Length specifiers valid for asm_fprintf. */
298 static const format_length_info asm_fprintf_length_specs[] =
300 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
301 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
302 { NULL, 0, 0, NULL, 0, 0 }
305 /* Length specifiers valid for GCC diagnostics. */
306 static const format_length_info gcc_diag_length_specs[] =
308 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
309 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
310 { NULL, 0, 0, NULL, 0, 0 }
313 /* The custom diagnostics all accept the same length specifiers. */
314 #define gcc_tdiag_length_specs gcc_diag_length_specs
315 #define gcc_cdiag_length_specs gcc_diag_length_specs
316 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
318 /* This differs from printf_length_specs only in that "Z" is not accepted. */
319 static const format_length_info scanf_length_specs[] =
321 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
322 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
323 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
324 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
325 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
326 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
327 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
328 { NULL, 0, 0, NULL, 0, 0 }
332 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
333 make no sense for a format type not part of any C standard version. */
334 static const format_length_info strfmon_length_specs[] =
336 /* A GNU extension. */
337 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
338 { NULL, 0, 0, NULL, 0, 0 }
341 static const format_flag_spec printf_flag_specs[] =
343 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
344 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
345 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
346 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
347 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
348 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
349 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
350 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
351 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
352 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
353 { 0, 0, 0, NULL, NULL, 0 }
357 static const format_flag_pair printf_flag_pairs[] =
361 { '0', 'p', 1, 'i' },
365 static const format_flag_spec asm_fprintf_flag_specs[] =
367 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
368 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
369 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
370 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
371 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
372 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
373 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
374 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
375 { 0, 0, 0, NULL, NULL, 0 }
378 static const format_flag_pair asm_fprintf_flag_pairs[] =
382 { '0', 'p', 1, 'i' },
386 static const format_flag_pair gcc_diag_flag_pairs[] =
391 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
392 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
393 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
395 static const format_flag_pair gcc_gfc_flag_pairs[] =
400 static const format_flag_spec gcc_diag_flag_specs[] =
402 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
403 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
404 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
405 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
406 { 0, 0, 0, NULL, NULL, 0 }
409 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
410 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
412 static const format_flag_spec gcc_cxxdiag_flag_specs[] =
414 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
415 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
416 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
417 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
418 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
419 { 0, 0, 0, NULL, NULL, 0 }
422 static const format_flag_spec scanf_flag_specs[] =
424 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
425 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
426 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
427 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
428 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
429 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
430 { 0, 0, 0, NULL, NULL, 0 }
434 static const format_flag_pair scanf_flag_pairs[] =
441 static const format_flag_spec strftime_flag_specs[] =
443 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
444 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
445 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
446 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
447 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
448 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
449 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
450 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
451 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
452 { 0, 0, 0, NULL, NULL, 0 }
456 static const format_flag_pair strftime_flag_pairs[] =
467 static const format_flag_spec strfmon_flag_specs[] =
469 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
470 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
471 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
472 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
473 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
474 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
475 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
476 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
477 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
478 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
479 { 0, 0, 0, NULL, NULL, 0 }
482 static const format_flag_pair strfmon_flag_pairs[] =
489 static const format_char_info print_char_table[] =
491 /* C89 conversion specifiers. */
492 { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "-wp0 +'I", "i", NULL },
493 { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0#", "i", NULL },
494 { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0'I", "i", NULL },
495 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'I", "", NULL },
496 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#I", "", NULL },
497 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
498 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
499 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
500 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W", NULL },
501 /* C99 conversion specifiers. */
502 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'I", "", NULL },
503 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
504 /* X/Open conversion specifiers. */
505 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
506 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
507 /* GNU conversion specifiers. */
508 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
509 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
512 static const format_char_info asm_fprintf_char_table[] =
514 /* C89 conversion specifiers. */
515 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
516 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
517 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
518 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
519 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
521 /* asm_fprintf conversion specifiers. */
522 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
523 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
524 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
525 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
526 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
527 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
528 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
529 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
532 static const format_char_info gcc_diag_char_table[] =
534 /* C89 conversion specifiers. */
535 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
536 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
537 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
538 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
539 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
540 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
542 /* Custom conversion specifiers. */
544 /* %H will require "location_t" at runtime. */
545 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
547 /* These will require a "tree" at runtime. */
548 { "J", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
550 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
551 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
552 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
555 static const format_char_info gcc_tdiag_char_table[] =
557 /* C89 conversion specifiers. */
558 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
559 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
560 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
561 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
562 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
563 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
565 /* Custom conversion specifiers. */
567 /* %H will require "location_t" at runtime. */
568 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
570 /* These will require a "tree" at runtime. */
571 { "DFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
573 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
574 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
575 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
578 static const format_char_info gcc_cdiag_char_table[] =
580 /* C89 conversion specifiers. */
581 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
582 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
583 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
584 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
585 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
586 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
588 /* Custom conversion specifiers. */
590 /* %H will require "location_t" at runtime. */
591 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
593 /* These will require a "tree" at runtime. */
594 { "DEFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
596 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
597 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
598 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
601 static const format_char_info gcc_cxxdiag_char_table[] =
603 /* C89 conversion specifiers. */
604 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
605 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
606 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
607 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
608 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
609 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
611 /* Custom conversion specifiers. */
613 /* %H will require "location_t" at runtime. */
614 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
616 /* These will require a "tree" at runtime. */
617 { "ADEFJTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
619 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
620 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
622 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
623 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
624 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
627 static const format_char_info gcc_gfc_char_table[] =
629 /* C89 conversion specifiers. */
630 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
631 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
632 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
634 /* gfc conversion specifiers. */
636 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
638 /* This will require a "locus" at runtime. */
639 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
641 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
644 static const format_char_info scan_char_table[] =
646 /* C89 conversion specifiers. */
647 { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "*w'I", "W", NULL },
648 { "u", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w'I", "W", NULL },
649 { "oxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w", "W", NULL },
650 { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
651 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW", NULL },
652 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW", NULL },
653 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[", NULL },
654 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
655 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W", NULL },
656 /* C99 conversion specifiers. */
657 { "FaA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
658 /* X/Open conversion specifiers. */
659 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
660 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W", NULL },
661 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
664 static const format_char_info time_char_table[] =
666 /* C89 conversion specifiers. */
667 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
668 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
669 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
670 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
671 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
672 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
673 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
674 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
675 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
676 /* C99 conversion specifiers. */
677 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
678 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
679 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
680 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
681 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
682 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
683 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
684 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
685 /* GNU conversion specifiers. */
686 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
687 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
688 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
691 static const format_char_info monetary_char_table[] =
693 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
694 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
697 /* This must be in the same order as enum format_type. */
698 static const format_kind_info format_types_orig[] =
700 { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
701 printf_flag_specs, printf_flag_pairs,
702 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
704 &integer_type_node, &integer_type_node
706 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
707 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
708 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
712 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
713 gcc_diag_flag_specs, gcc_diag_flag_pairs,
714 FMT_FLAG_ARG_CONVERT,
716 NULL, &integer_type_node
718 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
719 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
720 FMT_FLAG_ARG_CONVERT,
722 NULL, &integer_type_node
724 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
725 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
726 FMT_FLAG_ARG_CONVERT,
728 NULL, &integer_type_node
730 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
731 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
732 FMT_FLAG_ARG_CONVERT,
734 NULL, &integer_type_node
736 { "gcc_gfc", NULL, gcc_gfc_char_table, "", NULL,
737 NULL, gcc_gfc_flag_pairs,
738 FMT_FLAG_ARG_CONVERT,
742 { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
743 scanf_flag_specs, scanf_flag_pairs,
744 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
748 { "strftime", NULL, time_char_table, "_-0^#", "EO",
749 strftime_flag_specs, strftime_flag_pairs,
750 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0,
753 { "strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
754 strfmon_flag_specs, strfmon_flag_pairs,
755 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L',
760 /* This layer of indirection allows GCC to reassign format_types with
761 new data if necessary, while still allowing the original data to be
763 static const format_kind_info *format_types = format_types_orig;
764 /* We can modify this one. We also add target-specific format types
765 to the end of the array. */
766 static format_kind_info *dynamic_format_types;
768 static int n_format_types = ARRAY_SIZE (format_types_orig);
770 /* Structure detailing the results of checking a format function call
771 where the format expression may be a conditional expression with
772 many leaves resulting from nested conditional expressions. */
775 /* Number of leaves of the format argument that could not be checked
776 as they were not string literals. */
777 int number_non_literal;
778 /* Number of leaves of the format argument that were null pointers or
779 string literals, but had extra format arguments. */
780 int number_extra_args;
781 /* Number of leaves of the format argument that were null pointers or
782 string literals, but had extra format arguments and used $ operand
784 int number_dollar_extra_args;
785 /* Number of leaves of the format argument that were wide string
788 /* Number of leaves of the format argument that were empty strings. */
790 /* Number of leaves of the format argument that were unterminated
792 int number_unterminated;
793 /* Number of leaves of the format argument that were not counted above. */
795 } format_check_results;
799 format_check_results *res;
800 function_format_info *info;
802 } format_check_context;
804 static void check_format_info (function_format_info *, tree);
805 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
806 static void check_format_info_main (format_check_results *,
807 function_format_info *,
808 const char *, int, tree,
809 unsigned HOST_WIDE_INT);
811 static void init_dollar_format_checking (int, tree);
812 static int maybe_read_dollar_number (const char **, int,
813 tree, tree *, const format_kind_info *);
814 static bool avoid_dollar_number (const char *);
815 static void finish_dollar_format_checking (format_check_results *, int);
817 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
820 static void check_format_types (format_wanted_type *, const char *, int);
821 static void format_type_warning (const char *, const char *, int, tree,
822 int, const char *, tree, int);
824 /* Decode a format type from a string, returning the type, or
825 format_type_error if not valid, in which case the caller should print an
828 decode_format_type (const char *s)
833 for (i = 0; i < n_format_types; i++)
836 if (!strcmp (s, format_types[i].name))
838 alen = strlen (format_types[i].name);
839 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
840 && s[slen - 1] == '_' && s[slen - 2] == '_'
841 && !strncmp (s + 2, format_types[i].name, alen))
844 return format_type_error;
848 /* Check the argument list of a call to printf, scanf, etc.
849 ATTRS are the attributes on the function type.
850 PARAMS is the list of argument values. Also, if -Wmissing-format-attribute,
851 warn for calls to vprintf or vscanf in functions with no such format
852 attribute themselves. */
855 check_function_format (tree attrs, tree params)
859 /* See if this function has any format attributes. */
860 for (a = attrs; a; a = TREE_CHAIN (a))
862 if (is_attribute_p ("format", TREE_PURPOSE (a)))
865 function_format_info info;
866 decode_format_attr (TREE_VALUE (a), &info, 1);
867 check_format_info (&info, params);
868 if (warn_missing_format_attribute && info.first_arg_num == 0
869 && (format_types[info.format_type].flags
870 & (int) FMT_FLAG_ARG_CONVERT))
873 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
876 if (is_attribute_p ("format", TREE_PURPOSE (c))
877 && (decode_format_type (IDENTIFIER_POINTER
878 (TREE_VALUE (TREE_VALUE (c))))
879 == info.format_type))
883 /* Check if the current function has a parameter to which
884 the format attribute could be attached; if not, it
885 can't be a candidate for a format attribute, despite
886 the vprintf-like or vscanf-like call. */
888 for (args = DECL_ARGUMENTS (current_function_decl);
890 args = TREE_CHAIN (args))
892 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
893 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
898 warning (OPT_Wattributes, "function might be possible "
899 "candidate for %qs format attribute",
900 format_types[info.format_type].name);
908 /* Variables used by the checking of $ operand number formats. */
909 static char *dollar_arguments_used = NULL;
910 static char *dollar_arguments_pointer_p = NULL;
911 static int dollar_arguments_alloc = 0;
912 static int dollar_arguments_count;
913 static int dollar_first_arg_num;
914 static int dollar_max_arg_used;
915 static int dollar_format_warned;
917 /* Initialize the checking for a format string that may contain $
918 parameter number specifications; we will need to keep track of whether
919 each parameter has been used. FIRST_ARG_NUM is the number of the first
920 argument that is a parameter to the format, or 0 for a vprintf-style
921 function; PARAMS is the list of arguments starting at this argument. */
924 init_dollar_format_checking (int first_arg_num, tree params)
926 tree oparams = params;
928 dollar_first_arg_num = first_arg_num;
929 dollar_arguments_count = 0;
930 dollar_max_arg_used = 0;
931 dollar_format_warned = 0;
932 if (first_arg_num > 0)
936 dollar_arguments_count++;
937 params = TREE_CHAIN (params);
940 if (dollar_arguments_alloc < dollar_arguments_count)
942 if (dollar_arguments_used)
943 free (dollar_arguments_used);
944 if (dollar_arguments_pointer_p)
945 free (dollar_arguments_pointer_p);
946 dollar_arguments_alloc = dollar_arguments_count;
947 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
948 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
950 if (dollar_arguments_alloc)
952 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
953 if (first_arg_num > 0)
959 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
961 params = TREE_CHAIN (params);
969 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
970 is set, it is an error if one is not found; otherwise, it is OK. If
971 such a number is found, check whether it is within range and mark that
972 numbered operand as being used for later checking. Returns the operand
973 number if found and within range, zero if no such number was found and
974 this is OK, or -1 on error. PARAMS points to the first operand of the
975 format; PARAM_PTR is made to point to the parameter referred to. If
976 a $ format is found, *FORMAT is updated to point just after it. */
979 maybe_read_dollar_number (const char **format,
980 int dollar_needed, tree params, tree *param_ptr,
981 const format_kind_info *fki)
985 const char *fcp = *format;
990 warning (OPT_Wformat, "missing $ operand number in format");
998 while (ISDIGIT (*fcp))
1001 nargnum = 10 * argnum + (*fcp - '0');
1002 if (nargnum < 0 || nargnum / 10 != argnum)
1011 warning (OPT_Wformat, "missing $ operand number in format");
1018 if (pedantic && !dollar_format_warned)
1020 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1021 C_STD_NAME (STD_EXT));
1022 dollar_format_warned = 1;
1024 if (overflow_flag || argnum == 0
1025 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1027 warning (OPT_Wformat, "operand number out of range in format");
1030 if (argnum > dollar_max_arg_used)
1031 dollar_max_arg_used = argnum;
1032 /* For vprintf-style functions we may need to allocate more memory to
1033 track which arguments are used. */
1034 while (dollar_arguments_alloc < dollar_max_arg_used)
1037 nalloc = 2 * dollar_arguments_alloc + 16;
1038 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1040 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1042 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1043 nalloc - dollar_arguments_alloc);
1044 dollar_arguments_alloc = nalloc;
1046 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1047 && dollar_arguments_used[argnum - 1] == 1)
1049 dollar_arguments_used[argnum - 1] = 2;
1050 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1054 dollar_arguments_used[argnum - 1] = 1;
1055 if (dollar_first_arg_num)
1058 *param_ptr = params;
1059 for (i = 1; i < argnum && *param_ptr != 0; i++)
1060 *param_ptr = TREE_CHAIN (*param_ptr);
1062 /* This case shouldn't be caught here. */
1063 gcc_assert (*param_ptr);
1070 /* Ensure that FORMAT does not start with a decimal number followed by
1071 a $; give a diagnostic and return true if it does, false otherwise. */
1074 avoid_dollar_number (const char *format)
1076 if (!ISDIGIT (*format))
1078 while (ISDIGIT (*format))
1082 warning (OPT_Wformat, "$ operand number used after format without operand number");
1089 /* Finish the checking for a format string that used $ operand number formats
1090 instead of non-$ formats. We check for unused operands before used ones
1091 (a serious error, since the implementation of the format function
1092 can't know what types to pass to va_arg to find the later arguments).
1093 and for unused operands at the end of the format (if we know how many
1094 arguments the format had, so not for vprintf). If there were operand
1095 numbers out of range on a non-vprintf-style format, we won't have reached
1096 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1100 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1103 bool found_pointer_gap = false;
1104 for (i = 0; i < dollar_max_arg_used; i++)
1106 if (!dollar_arguments_used[i])
1108 if (pointer_gap_ok && (dollar_first_arg_num == 0
1109 || dollar_arguments_pointer_p[i]))
1110 found_pointer_gap = true;
1112 warning (OPT_Wformat,
1113 "format argument %d unused before used argument %d in $-style format",
1114 i + 1, dollar_max_arg_used);
1117 if (found_pointer_gap
1118 || (dollar_first_arg_num
1119 && dollar_max_arg_used < dollar_arguments_count))
1121 res->number_other--;
1122 res->number_dollar_extra_args++;
1127 /* Retrieve the specification for a format flag. SPEC contains the
1128 specifications for format flags for the applicable kind of format.
1129 FLAG is the flag in question. If PREDICATES is NULL, the basic
1130 spec for that flag must be retrieved and must exist. If
1131 PREDICATES is not NULL, it is a string listing possible predicates
1132 for the spec entry; if an entry predicated on any of these is
1133 found, it is returned, otherwise NULL is returned. */
1135 static const format_flag_spec *
1136 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1139 for (i = 0; spec[i].flag_char != 0; i++)
1141 if (spec[i].flag_char != flag)
1143 if (predicates != NULL)
1145 if (spec[i].predicate != 0
1146 && strchr (predicates, spec[i].predicate) != 0)
1149 else if (spec[i].predicate == 0)
1152 gcc_assert (predicates);
1157 /* Check the argument list of a call to printf, scanf, etc.
1158 INFO points to the function_format_info structure.
1159 PARAMS is the list of argument values. */
1162 check_format_info (function_format_info *info, tree params)
1164 format_check_context format_ctx;
1165 unsigned HOST_WIDE_INT arg_num;
1167 format_check_results res;
1168 /* Skip to format argument. If the argument isn't available, there's
1169 no work for us to do; prototype checking will catch the problem. */
1170 for (arg_num = 1; ; ++arg_num)
1174 if (arg_num == info->format_num)
1176 params = TREE_CHAIN (params);
1178 format_tree = TREE_VALUE (params);
1179 params = TREE_CHAIN (params);
1180 if (format_tree == 0)
1183 res.number_non_literal = 0;
1184 res.number_extra_args = 0;
1185 res.number_dollar_extra_args = 0;
1186 res.number_wide = 0;
1187 res.number_empty = 0;
1188 res.number_unterminated = 0;
1189 res.number_other = 0;
1191 format_ctx.res = &res;
1192 format_ctx.info = info;
1193 format_ctx.params = params;
1195 check_function_arguments_recurse (check_format_arg, &format_ctx,
1196 format_tree, arg_num);
1198 if (res.number_non_literal > 0)
1200 /* Functions taking a va_list normally pass a non-literal format
1201 string. These functions typically are declared with
1202 first_arg_num == 0, so avoid warning in those cases. */
1203 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1205 /* For strftime-like formats, warn for not checking the format
1206 string; but there are no arguments to check. */
1207 warning (OPT_Wformat_nonliteral,
1208 "format not a string literal, format string not checked");
1210 else if (info->first_arg_num != 0)
1212 /* If there are no arguments for the format at all, we may have
1213 printf (foo) which is likely to be a security hole. */
1214 while (arg_num + 1 < info->first_arg_num)
1218 params = TREE_CHAIN (params);
1221 if (params == 0 && warn_format_security)
1222 warning (OPT_Wformat_security,
1223 "format not a string literal and no format arguments");
1224 else if (params == 0 && warn_format_nonliteral)
1225 warning (OPT_Wformat_nonliteral,
1226 "format not a string literal and no format arguments");
1228 warning (OPT_Wformat_nonliteral,
1229 "format not a string literal, argument types not checked");
1233 /* If there were extra arguments to the format, normally warn. However,
1234 the standard does say extra arguments are ignored, so in the specific
1235 case where we have multiple leaves (conditional expressions or
1236 ngettext) allow extra arguments if at least one leaf didn't have extra
1237 arguments, but was otherwise OK (either non-literal or checked OK).
1238 If the format is an empty string, this should be counted similarly to the
1239 case of extra format arguments. */
1240 if (res.number_extra_args > 0 && res.number_non_literal == 0
1241 && res.number_other == 0)
1242 warning (OPT_Wformat_extra_args, "too many arguments for format");
1243 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1244 && res.number_other == 0)
1245 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1246 if (res.number_empty > 0 && res.number_non_literal == 0
1247 && res.number_other == 0)
1248 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1249 format_types[info->format_type].name);
1251 if (res.number_wide > 0)
1252 warning (OPT_Wformat, "format is a wide character string");
1254 if (res.number_unterminated > 0)
1255 warning (OPT_Wformat, "unterminated format string");
1258 /* Callback from check_function_arguments_recurse to check a
1259 format string. FORMAT_TREE is the format parameter. ARG_NUM
1260 is the number of the format argument. CTX points to a
1261 format_check_context. */
1264 check_format_arg (void *ctx, tree format_tree,
1265 unsigned HOST_WIDE_INT arg_num)
1267 format_check_context *format_ctx = (format_check_context *) ctx;
1268 format_check_results *res = format_ctx->res;
1269 function_format_info *info = format_ctx->info;
1270 tree params = format_ctx->params;
1273 HOST_WIDE_INT offset;
1274 const char *format_chars;
1275 tree array_size = 0;
1278 if (integer_zerop (format_tree))
1280 /* Skip to first argument to check, so we can see if this format
1281 has any arguments (it shouldn't). */
1282 while (arg_num + 1 < info->first_arg_num)
1286 params = TREE_CHAIN (params);
1291 res->number_other++;
1293 res->number_extra_args++;
1299 if (TREE_CODE (format_tree) == PLUS_EXPR)
1303 arg0 = TREE_OPERAND (format_tree, 0);
1304 arg1 = TREE_OPERAND (format_tree, 1);
1307 if (TREE_CODE (arg1) == INTEGER_CST)
1309 else if (TREE_CODE (arg0) == INTEGER_CST)
1316 res->number_non_literal++;
1319 if (!host_integerp (arg1, 0)
1320 || (offset = tree_low_cst (arg1, 0)) < 0)
1322 res->number_non_literal++;
1326 if (TREE_CODE (format_tree) != ADDR_EXPR)
1328 res->number_non_literal++;
1331 format_tree = TREE_OPERAND (format_tree, 0);
1332 if (TREE_CODE (format_tree) == ARRAY_REF
1333 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1334 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1335 format_tree = TREE_OPERAND (format_tree, 0);
1336 if (TREE_CODE (format_tree) == VAR_DECL
1337 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1338 && (array_init = decl_constant_value (format_tree)) != format_tree
1339 && TREE_CODE (array_init) == STRING_CST)
1341 /* Extract the string constant initializer. Note that this may include
1342 a trailing NUL character that is not in the array (e.g.
1343 const char a[3] = "foo";). */
1344 array_size = DECL_SIZE_UNIT (format_tree);
1345 format_tree = array_init;
1347 if (TREE_CODE (format_tree) != STRING_CST)
1349 res->number_non_literal++;
1352 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1357 format_chars = TREE_STRING_POINTER (format_tree);
1358 format_length = TREE_STRING_LENGTH (format_tree);
1359 if (array_size != 0)
1361 /* Variable length arrays can't be initialized. */
1362 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1364 if (host_integerp (array_size, 0))
1366 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1367 if (array_size_value > 0
1368 && array_size_value == (int) array_size_value
1369 && format_length > array_size_value)
1370 format_length = array_size_value;
1375 if (offset >= format_length)
1377 res->number_non_literal++;
1380 format_chars += offset;
1381 format_length -= offset;
1383 if (format_length < 1)
1385 res->number_unterminated++;
1388 if (format_length == 1)
1390 res->number_empty++;
1393 if (format_chars[--format_length] != 0)
1395 res->number_unterminated++;
1399 /* Skip to first argument to check. */
1400 while (arg_num + 1 < info->first_arg_num)
1404 params = TREE_CHAIN (params);
1407 /* Provisionally increment res->number_other; check_format_info_main
1408 will decrement it if it finds there are extra arguments, but this way
1409 need not adjust it for every return. */
1410 res->number_other++;
1411 check_format_info_main (res, info, format_chars, format_length,
1416 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1417 is the NUL-terminated format string (which at this point may contain
1418 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1419 terminating NUL character). ARG_NUM is one less than the number of
1420 the first format argument to check; PARAMS points to that format
1421 argument in the list of arguments. */
1424 check_format_info_main (format_check_results *res,
1425 function_format_info *info, const char *format_chars,
1426 int format_length, tree params,
1427 unsigned HOST_WIDE_INT arg_num)
1429 const char *orig_format_chars = format_chars;
1430 tree first_fillin_param = params;
1432 const format_kind_info *fki = &format_types[info->format_type];
1433 const format_flag_spec *flag_specs = fki->flag_specs;
1434 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1436 /* -1 if no conversions taking an operand have been found; 0 if one has
1437 and it didn't use $; 1 if $ formats are in use. */
1438 int has_operand_number = -1;
1440 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1445 int suppressed = FALSE;
1446 const char *length_chars = NULL;
1447 enum format_lengths length_chars_val = FMT_LEN_none;
1448 enum format_std_version length_chars_std = STD_C89;
1452 int main_arg_num = 0;
1453 tree main_arg_params = 0;
1454 enum format_std_version wanted_type_std;
1455 const char *wanted_type_name;
1456 format_wanted_type width_wanted_type;
1457 format_wanted_type precision_wanted_type;
1458 format_wanted_type main_wanted_type;
1459 format_wanted_type *first_wanted_type = NULL;
1460 format_wanted_type *last_wanted_type = NULL;
1461 const format_length_info *fli = NULL;
1462 const format_char_info *fci = NULL;
1463 char flag_chars[256];
1465 const char *format_start = format_chars;
1466 if (*format_chars == 0)
1468 if (format_chars - orig_format_chars != format_length)
1469 warning (OPT_Wformat, "embedded %<\\0%> in format");
1470 if (info->first_arg_num != 0 && params != 0
1471 && has_operand_number <= 0)
1473 res->number_other--;
1474 res->number_extra_args++;
1476 if (has_operand_number > 0)
1477 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1480 if (*format_chars++ != '%')
1482 if (*format_chars == 0)
1484 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1487 if (*format_chars == '%')
1494 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1496 /* Possibly read a $ operand number at the start of the format.
1497 If one was previously used, one is required here. If one
1498 is not used here, we can't immediately conclude this is a
1499 format without them, since it could be printf %m or scanf %*. */
1501 opnum = maybe_read_dollar_number (&format_chars, 0,
1503 &main_arg_params, fki);
1508 has_operand_number = 1;
1509 main_arg_num = opnum + info->first_arg_num - 1;
1512 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1514 if (avoid_dollar_number (format_chars))
1518 /* Read any format flags, but do not yet validate them beyond removing
1519 duplicates, since in general validation depends on the rest of
1521 while (*format_chars != 0
1522 && strchr (fki->flag_chars, *format_chars) != 0)
1524 const format_flag_spec *s = get_flag_spec (flag_specs,
1525 *format_chars, NULL);
1526 if (strchr (flag_chars, *format_chars) != 0)
1528 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1532 i = strlen (flag_chars);
1533 flag_chars[i++] = *format_chars;
1536 if (s->skip_next_char)
1539 if (*format_chars == 0)
1541 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1548 /* Read any format width, possibly * or *m$. */
1549 if (fki->width_char != 0)
1551 if (fki->width_type != NULL && *format_chars == '*')
1553 i = strlen (flag_chars);
1554 flag_chars[i++] = fki->width_char;
1556 /* "...a field width...may be indicated by an asterisk.
1557 In this case, an int argument supplies the field width..." */
1559 if (has_operand_number != 0)
1562 opnum = maybe_read_dollar_number (&format_chars,
1563 has_operand_number == 1,
1570 has_operand_number = 1;
1571 arg_num = opnum + info->first_arg_num - 1;
1574 has_operand_number = 0;
1578 if (avoid_dollar_number (format_chars))
1581 if (info->first_arg_num != 0)
1585 warning (OPT_Wformat, "too few arguments for format");
1588 cur_param = TREE_VALUE (params);
1589 if (has_operand_number <= 0)
1591 params = TREE_CHAIN (params);
1594 width_wanted_type.wanted_type = *fki->width_type;
1595 width_wanted_type.wanted_type_name = NULL;
1596 width_wanted_type.pointer_count = 0;
1597 width_wanted_type.char_lenient_flag = 0;
1598 width_wanted_type.writing_in_flag = 0;
1599 width_wanted_type.reading_from_flag = 0;
1600 width_wanted_type.name = _("field width");
1601 width_wanted_type.param = cur_param;
1602 width_wanted_type.arg_num = arg_num;
1603 width_wanted_type.next = NULL;
1604 if (last_wanted_type != 0)
1605 last_wanted_type->next = &width_wanted_type;
1606 if (first_wanted_type == 0)
1607 first_wanted_type = &width_wanted_type;
1608 last_wanted_type = &width_wanted_type;
1613 /* Possibly read a numeric width. If the width is zero,
1614 we complain if appropriate. */
1615 int non_zero_width_char = FALSE;
1616 int found_width = FALSE;
1617 while (ISDIGIT (*format_chars))
1620 if (*format_chars != '0')
1621 non_zero_width_char = TRUE;
1624 if (found_width && !non_zero_width_char &&
1625 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1626 warning (OPT_Wformat, "zero width in %s format", fki->name);
1629 i = strlen (flag_chars);
1630 flag_chars[i++] = fki->width_char;
1636 /* Read any format left precision (must be a number, not *). */
1637 if (fki->left_precision_char != 0 && *format_chars == '#')
1640 i = strlen (flag_chars);
1641 flag_chars[i++] = fki->left_precision_char;
1643 if (!ISDIGIT (*format_chars))
1644 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1645 while (ISDIGIT (*format_chars))
1649 /* Read any format precision, possibly * or *m$. */
1650 if (fki->precision_char != 0 && *format_chars == '.')
1653 i = strlen (flag_chars);
1654 flag_chars[i++] = fki->precision_char;
1656 if (fki->precision_type != NULL && *format_chars == '*')
1658 /* "...a...precision...may be indicated by an asterisk.
1659 In this case, an int argument supplies the...precision." */
1661 if (has_operand_number != 0)
1664 opnum = maybe_read_dollar_number (&format_chars,
1665 has_operand_number == 1,
1672 has_operand_number = 1;
1673 arg_num = opnum + info->first_arg_num - 1;
1676 has_operand_number = 0;
1680 if (avoid_dollar_number (format_chars))
1683 if (info->first_arg_num != 0)
1687 warning (OPT_Wformat, "too few arguments for format");
1690 cur_param = TREE_VALUE (params);
1691 if (has_operand_number <= 0)
1693 params = TREE_CHAIN (params);
1696 precision_wanted_type.wanted_type = *fki->precision_type;
1697 precision_wanted_type.wanted_type_name = NULL;
1698 precision_wanted_type.pointer_count = 0;
1699 precision_wanted_type.char_lenient_flag = 0;
1700 precision_wanted_type.writing_in_flag = 0;
1701 precision_wanted_type.reading_from_flag = 0;
1702 precision_wanted_type.name = _("field precision");
1703 precision_wanted_type.param = cur_param;
1704 precision_wanted_type.arg_num = arg_num;
1705 precision_wanted_type.next = NULL;
1706 if (last_wanted_type != 0)
1707 last_wanted_type->next = &precision_wanted_type;
1708 if (first_wanted_type == 0)
1709 first_wanted_type = &precision_wanted_type;
1710 last_wanted_type = &precision_wanted_type;
1715 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1716 && !ISDIGIT (*format_chars))
1717 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1718 while (ISDIGIT (*format_chars))
1723 /* Read any length modifier, if this kind of format has them. */
1724 fli = fki->length_char_specs;
1725 length_chars = NULL;
1726 length_chars_val = FMT_LEN_none;
1727 length_chars_std = STD_C89;
1730 while (fli->name != 0 && fli->name[0] != *format_chars)
1735 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1738 length_chars = fli->double_name;
1739 length_chars_val = fli->double_index;
1740 length_chars_std = fli->double_std;
1744 length_chars = fli->name;
1745 length_chars_val = fli->index;
1746 length_chars_std = fli->std;
1748 i = strlen (flag_chars);
1749 flag_chars[i++] = fki->length_code_char;
1754 /* Warn if the length modifier is non-standard. */
1755 if (ADJ_STD (length_chars_std) > C_STD_VER)
1756 warning (OPT_Wformat,
1757 "%s does not support the %qs %s length modifier",
1758 C_STD_NAME (length_chars_std), length_chars,
1763 /* Read any modifier (strftime E/O). */
1764 if (fki->modifier_chars != NULL)
1766 while (*format_chars != 0
1767 && strchr (fki->modifier_chars, *format_chars) != 0)
1769 if (strchr (flag_chars, *format_chars) != 0)
1771 const format_flag_spec *s = get_flag_spec (flag_specs,
1772 *format_chars, NULL);
1773 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1777 i = strlen (flag_chars);
1778 flag_chars[i++] = *format_chars;
1785 /* Handle the scanf allocation kludge. */
1786 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1788 if (*format_chars == 'a' && !flag_isoc99)
1790 if (format_chars[1] == 's' || format_chars[1] == 'S'
1791 || format_chars[1] == '[')
1793 /* 'a' is used as a flag. */
1794 i = strlen (flag_chars);
1795 flag_chars[i++] = 'a';
1802 format_char = *format_chars;
1803 if (format_char == 0
1804 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1805 && format_char == '%'))
1807 warning (OPT_Wformat, "conversion lacks type at end of format");
1811 fci = fki->conversion_specs;
1812 while (fci->format_chars != 0
1813 && strchr (fci->format_chars, format_char) == 0)
1815 if (fci->format_chars == 0)
1817 if (ISGRAPH (format_char))
1818 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1821 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1827 if (ADJ_STD (fci->std) > C_STD_VER)
1828 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1829 C_STD_NAME (fci->std), format_char, fki->name);
1832 /* Validate the individual flags used, removing any that are invalid. */
1835 for (i = 0; flag_chars[i] != 0; i++)
1837 const format_flag_spec *s = get_flag_spec (flag_specs,
1838 flag_chars[i], NULL);
1839 flag_chars[i - d] = flag_chars[i];
1840 if (flag_chars[i] == fki->length_code_char)
1842 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1844 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1845 _(s->name), format_char, fki->name);
1851 const format_flag_spec *t;
1852 if (ADJ_STD (s->std) > C_STD_VER)
1853 warning (OPT_Wformat, "%s does not support %s",
1854 C_STD_NAME (s->std), _(s->long_name));
1855 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1856 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1858 const char *long_name = (t->long_name != NULL
1861 if (ADJ_STD (t->std) > C_STD_VER)
1862 warning (OPT_Wformat,
1863 "%s does not support %s with the %<%%%c%> %s format",
1864 C_STD_NAME (t->std), _(long_name),
1865 format_char, fki->name);
1869 flag_chars[i - d] = 0;
1872 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1873 && strchr (flag_chars, 'a') != 0)
1876 if (fki->suppression_char
1877 && strchr (flag_chars, fki->suppression_char) != 0)
1880 /* Validate the pairs of flags used. */
1881 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1883 const format_flag_spec *s, *t;
1884 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1886 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1888 if (bad_flag_pairs[i].predicate != 0
1889 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1891 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1892 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1893 if (bad_flag_pairs[i].ignored)
1895 if (bad_flag_pairs[i].predicate != 0)
1896 warning (OPT_Wformat,
1897 "%s ignored with %s and %<%%%c%> %s format",
1898 _(s->name), _(t->name), format_char,
1901 warning (OPT_Wformat, "%s ignored with %s in %s format",
1902 _(s->name), _(t->name), fki->name);
1906 if (bad_flag_pairs[i].predicate != 0)
1907 warning (OPT_Wformat,
1908 "use of %s and %s together with %<%%%c%> %s format",
1909 _(s->name), _(t->name), format_char,
1912 warning (OPT_Wformat, "use of %s and %s together in %s format",
1913 _(s->name), _(t->name), fki->name);
1917 /* Give Y2K warnings. */
1918 if (warn_format_y2k)
1921 if (strchr (fci->flags2, '4') != 0)
1922 if (strchr (flag_chars, 'E') != 0)
1926 else if (strchr (fci->flags2, '3') != 0)
1928 else if (strchr (fci->flags2, '2') != 0)
1931 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1932 "year in some locales", format_char);
1933 else if (y2k_level == 2)
1934 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1935 "year", format_char);
1938 if (strchr (fci->flags2, '[') != 0)
1940 /* Skip over scan set, in case it happens to have '%' in it. */
1941 if (*format_chars == '^')
1943 /* Find closing bracket; if one is hit immediately, then
1944 it's part of the scan set rather than a terminator. */
1945 if (*format_chars == ']')
1947 while (*format_chars && *format_chars != ']')
1949 if (*format_chars != ']')
1950 /* The end of the format string was reached. */
1951 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
1955 wanted_type_name = 0;
1956 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
1958 wanted_type = (fci->types[length_chars_val].type
1959 ? *fci->types[length_chars_val].type : 0);
1960 wanted_type_name = fci->types[length_chars_val].name;
1961 wanted_type_std = fci->types[length_chars_val].std;
1962 if (wanted_type == 0)
1964 warning (OPT_Wformat,
1965 "use of %qs length modifier with %qc type character",
1966 length_chars, format_char);
1967 /* Heuristic: skip one argument when an invalid length/type
1968 combination is encountered. */
1972 warning (OPT_Wformat, "too few arguments for format");
1975 params = TREE_CHAIN (params);
1979 /* Warn if non-standard, provided it is more non-standard
1980 than the length and type characters that may already
1981 have been warned for. */
1982 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
1983 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
1985 if (ADJ_STD (wanted_type_std) > C_STD_VER)
1986 warning (OPT_Wformat,
1987 "%s does not support the %<%%%s%c%> %s format",
1988 C_STD_NAME (wanted_type_std), length_chars,
1989 format_char, fki->name);
1993 main_wanted_type.next = NULL;
1995 /* Finally. . .check type of argument against desired type! */
1996 if (info->first_arg_num == 0)
1998 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2001 if (main_arg_num != 0)
2004 warning (OPT_Wformat, "operand number specified with "
2005 "suppressed assignment");
2007 warning (OPT_Wformat, "operand number specified for format "
2008 "taking no argument");
2013 format_wanted_type *wanted_type_ptr;
2015 if (main_arg_num != 0)
2017 arg_num = main_arg_num;
2018 params = main_arg_params;
2023 if (has_operand_number > 0)
2025 warning (OPT_Wformat, "missing $ operand number in format");
2029 has_operand_number = 0;
2032 wanted_type_ptr = &main_wanted_type;
2037 warning (OPT_Wformat, "too few arguments for format");
2041 cur_param = TREE_VALUE (params);
2042 params = TREE_CHAIN (params);
2044 wanted_type_ptr->wanted_type = wanted_type;
2045 wanted_type_ptr->wanted_type_name = wanted_type_name;
2046 wanted_type_ptr->pointer_count = fci->pointer_count + aflag;
2047 wanted_type_ptr->char_lenient_flag = 0;
2048 if (strchr (fci->flags2, 'c') != 0)
2049 wanted_type_ptr->char_lenient_flag = 1;
2050 wanted_type_ptr->writing_in_flag = 0;
2051 wanted_type_ptr->reading_from_flag = 0;
2053 wanted_type_ptr->writing_in_flag = 1;
2056 if (strchr (fci->flags2, 'W') != 0)
2057 wanted_type_ptr->writing_in_flag = 1;
2058 if (strchr (fci->flags2, 'R') != 0)
2059 wanted_type_ptr->reading_from_flag = 1;
2061 wanted_type_ptr->name = NULL;
2062 wanted_type_ptr->param = cur_param;
2063 wanted_type_ptr->arg_num = arg_num;
2064 wanted_type_ptr->next = NULL;
2065 if (last_wanted_type != 0)
2066 last_wanted_type->next = wanted_type_ptr;
2067 if (first_wanted_type == 0)
2068 first_wanted_type = wanted_type_ptr;
2069 last_wanted_type = wanted_type_ptr;
2074 wanted_type_ptr = ggc_alloc (sizeof (main_wanted_type));
2076 wanted_type = *fci->types[length_chars_val].type;
2077 wanted_type_name = fci->types[length_chars_val].name;
2082 if (first_wanted_type != 0)
2083 check_format_types (first_wanted_type, format_start,
2084 format_chars - format_start);
2086 if (main_wanted_type.next != NULL)
2088 format_wanted_type *wanted_type_ptr = main_wanted_type.next;
2089 while (wanted_type_ptr)
2091 format_wanted_type *next = wanted_type_ptr->next;
2092 ggc_free (wanted_type_ptr);
2093 wanted_type_ptr = next;
2100 /* Check the argument types from a single format conversion (possibly
2101 including width and precision arguments). */
2103 check_format_types (format_wanted_type *types, const char *format_start,
2106 for (; types != 0; types = types->next)
2115 cur_param = types->param;
2116 cur_type = TREE_TYPE (cur_param);
2117 if (cur_type == error_mark_node)
2119 orig_cur_type = cur_type;
2121 wanted_type = types->wanted_type;
2122 arg_num = types->arg_num;
2124 /* The following should not occur here. */
2125 gcc_assert (wanted_type);
2126 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2128 if (types->pointer_count == 0)
2129 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2131 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2133 STRIP_NOPS (cur_param);
2135 /* Check the types of any additional pointer arguments
2136 that precede the "real" argument. */
2137 for (i = 0; i < types->pointer_count; ++i)
2139 if (TREE_CODE (cur_type) == POINTER_TYPE)
2141 cur_type = TREE_TYPE (cur_type);
2142 if (cur_type == error_mark_node)
2145 /* Check for writing through a NULL pointer. */
2146 if (types->writing_in_flag
2149 && integer_zerop (cur_param))
2150 warning (OPT_Wformat, "writing through null pointer "
2151 "(argument %d)", arg_num);
2153 /* Check for reading through a NULL pointer. */
2154 if (types->reading_from_flag
2157 && integer_zerop (cur_param))
2158 warning (OPT_Wformat, "reading through null pointer "
2159 "(argument %d)", arg_num);
2161 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2162 cur_param = TREE_OPERAND (cur_param, 0);
2166 /* See if this is an attempt to write into a const type with
2167 scanf or with printf "%n". Note: the writing in happens
2168 at the first indirection only, if for example
2169 void * const * is passed to scanf %p; passing
2170 const void ** is simply passing an incompatible type. */
2171 if (types->writing_in_flag
2173 && (TYPE_READONLY (cur_type)
2175 && (CONSTANT_CLASS_P (cur_param)
2176 || (DECL_P (cur_param)
2177 && TREE_READONLY (cur_param))))))
2178 warning (OPT_Wformat, "writing into constant object "
2179 "(argument %d)", arg_num);
2181 /* If there are extra type qualifiers beyond the first
2182 indirection, then this makes the types technically
2186 && (TYPE_READONLY (cur_type)
2187 || TYPE_VOLATILE (cur_type)
2188 || TYPE_RESTRICT (cur_type)))
2189 warning (OPT_Wformat, "extra type qualifiers in format "
2190 "argument (argument %d)",
2196 format_type_warning (types->name, format_start, format_length,
2197 wanted_type, types->pointer_count,
2198 types->wanted_type_name, orig_cur_type,
2204 if (i < types->pointer_count)
2207 cur_type = TYPE_MAIN_VARIANT (cur_type);
2209 /* Check whether the argument type is a character type. This leniency
2210 only applies to certain formats, flagged with 'c'.
2212 if (types->char_lenient_flag)
2213 char_type_flag = (cur_type == char_type_node
2214 || cur_type == signed_char_type_node
2215 || cur_type == unsigned_char_type_node);
2217 /* Check the type of the "real" argument, if there's a type we want. */
2218 if (wanted_type == cur_type)
2220 /* If we want 'void *', allow any pointer type.
2221 (Anything else would already have got a warning.)
2222 With -pedantic, only allow pointers to void and to character
2224 if (wanted_type == void_type_node
2225 && (!pedantic || (i == 1 && char_type_flag)))
2227 /* Don't warn about differences merely in signedness, unless
2228 -pedantic. With -pedantic, warn if the type is a pointer
2229 target and not a character type, and for character types at
2230 a second level of indirection. */
2231 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2232 && TREE_CODE (cur_type) == INTEGER_TYPE
2233 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2234 && (TYPE_UNSIGNED (wanted_type)
2235 ? wanted_type == c_common_unsigned_type (cur_type)
2236 : wanted_type == c_common_signed_type (cur_type)))
2238 /* Likewise, "signed char", "unsigned char" and "char" are
2239 equivalent but the above test won't consider them equivalent. */
2240 if (wanted_type == char_type_node
2241 && (!pedantic || i < 2)
2244 /* Now we have a type mismatch. */
2245 format_type_warning (types->name, format_start, format_length,
2246 wanted_type, types->pointer_count,
2247 types->wanted_type_name, orig_cur_type, arg_num);
2252 /* Give a warning about a format argument of different type from that
2253 expected. DESCR is a description such as "field precision", or
2254 NULL for an ordinary format. For an ordinary format, FORMAT_START
2255 points to where the format starts in the format string and
2256 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2257 should have after POINTER_COUNT pointer dereferences.
2258 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2259 or NULL if the ordinary name of the type should be used. ARG_TYPE
2260 is the type of the actual argument. ARG_NUM is the number of that
2263 format_type_warning (const char *descr, const char *format_start,
2264 int format_length, tree wanted_type, int pointer_count,
2265 const char *wanted_type_name, tree arg_type, int arg_num)
2268 /* If ARG_TYPE is a typedef with a misleading name (for example,
2269 size_t but not the standard size_t expected by printf %zu), avoid
2270 printing the typedef name. */
2271 if (wanted_type_name
2272 && TYPE_NAME (arg_type)
2273 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2274 && DECL_NAME (TYPE_NAME (arg_type))
2275 && !strcmp (wanted_type_name,
2276 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2277 arg_type = TYPE_MAIN_VARIANT (arg_type);
2278 /* The format type and name exclude any '*' for pointers, so those
2279 must be formatted manually. For all the types we currently have,
2280 this is adequate, but formats taking pointers to functions or
2281 arrays would require the full type to be built up in order to
2282 print it with %T. */
2283 p = alloca (pointer_count + 2);
2284 if (pointer_count == 0)
2286 else if (c_dialect_cxx ())
2288 memset (p, '*', pointer_count);
2289 p[pointer_count] = 0;
2294 memset (p + 1, '*', pointer_count);
2295 p[pointer_count + 1] = 0;
2297 if (wanted_type_name)
2300 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2301 "but argument %d has type %qT",
2302 descr, wanted_type_name, p, arg_num, arg_type);
2304 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2305 "but argument %d has type %qT",
2306 format_length, format_start, wanted_type_name, p,
2312 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2313 "but argument %d has type %qT",
2314 descr, wanted_type, p, arg_num, arg_type);
2316 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2317 "but argument %d has type %qT",
2318 format_length, format_start, wanted_type, p, arg_num, arg_type);
2323 /* Given a format_char_info array FCI, and a character C, this function
2324 returns the index into the conversion_specs where that specifier's
2325 data is located. The character must exist. */
2327 find_char_info_specifier_index (const format_char_info *fci, int c)
2331 for (i = 0; fci->format_chars; i++, fci++)
2332 if (strchr (fci->format_chars, c))
2335 /* We shouldn't be looking for a non-existent specifier. */
2339 /* Given a format_length_info array FLI, and a character C, this
2340 function returns the index into the conversion_specs where that
2341 modifier's data is located. The character must exist. */
2343 find_length_info_modifier_index (const format_length_info *fli, int c)
2347 for (i = 0; fli->name; i++, fli++)
2348 if (strchr (fli->name, c))
2351 /* We shouldn't be looking for a non-existent modifier. */
2355 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2356 use in GCC's __asm_fprintf__ custom format attribute. You must
2357 have set dynamic_format_types before calling this function. */
2359 init_dynamic_asm_fprintf_info (void)
2365 format_length_info *new_asm_fprintf_length_specs;
2368 /* Find the underlying type for HOST_WIDE_INT. For the %w
2369 length modifier to work, one must have issued: "typedef
2370 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2371 prior to using that modifier. */
2372 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2375 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2378 hwi = identifier_global_value (hwi);
2379 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2381 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2384 hwi = DECL_ORIGINAL_TYPE (hwi);
2386 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2388 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2389 " or %<long long%>");
2393 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2394 new_asm_fprintf_length_specs = (format_length_info *)
2395 xmemdup (asm_fprintf_length_specs,
2396 sizeof (asm_fprintf_length_specs),
2397 sizeof (asm_fprintf_length_specs));
2399 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2400 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2401 if (hwi == long_integer_type_node)
2402 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2403 else if (hwi == long_long_integer_type_node)
2404 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2408 /* Assign the new data for use. */
2409 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2410 new_asm_fprintf_length_specs;
2414 /* Determine the type of a "locus" in the code being compiled for use
2415 in GCC's __gcc_gfc__ custom format attribute. You must have set
2416 dynamic_format_types before calling this function. */
2418 init_dynamic_gfc_info (void)
2424 static format_char_info *gfc_fci;
2426 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2427 must have declared 'locus' prior to using this attribute. If
2428 we haven't seen this declarations then you shouldn't use the
2429 specifier requiring that type. */
2430 if ((locus = maybe_get_identifier ("locus")))
2432 locus = identifier_global_value (locus);
2435 if (TREE_CODE (locus) != TYPE_DECL)
2437 error ("%<locus%> is not defined as a type");
2441 locus = TREE_TYPE (locus);
2445 /* Assign the new data for use. */
2447 /* Handle the __gcc_gfc__ format specifics. */
2449 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2450 gfc_fci = (format_char_info *)
2451 xmemdup (gcc_gfc_char_table,
2452 sizeof (gcc_gfc_char_table),
2453 sizeof (gcc_gfc_char_table));
2456 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2457 gfc_fci[i].types[0].type = &locus;
2458 gfc_fci[i].pointer_count = 1;
2463 /* Determine the types of "tree" and "location_t" in the code being
2464 compiled for use in GCC's diagnostic custom format attributes. You
2465 must have set dynamic_format_types before calling this function. */
2467 init_dynamic_diag_info (void)
2469 static tree t, loc, hwi;
2471 if (!loc || !t || !hwi)
2473 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2474 static format_length_info *diag_ls;
2477 /* For the GCC-diagnostics custom format specifiers to work, one
2478 must have declared 'tree' and/or 'location_t' prior to using
2479 those attributes. If we haven't seen these declarations then
2480 you shouldn't use the specifiers requiring these types.
2481 However we don't force a hard ICE because we may see only one
2482 or the other type. */
2483 if ((loc = maybe_get_identifier ("location_t")))
2485 loc = identifier_global_value (loc);
2488 if (TREE_CODE (loc) != TYPE_DECL)
2490 error ("%<location_t%> is not defined as a type");
2494 loc = TREE_TYPE (loc);
2498 /* We need to grab the underlying 'union tree_node' so peek into
2499 an extra type level. */
2500 if ((t = maybe_get_identifier ("tree")))
2502 t = identifier_global_value (t);
2505 if (TREE_CODE (t) != TYPE_DECL)
2507 error ("%<tree%> is not defined as a type");
2510 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2512 error ("%<tree%> is not defined as a pointer type");
2516 t = TREE_TYPE (TREE_TYPE (t));
2520 /* Find the underlying type for HOST_WIDE_INT. For the %w
2521 length modifier to work, one must have issued: "typedef
2522 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2523 prior to using that modifier. */
2524 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2526 hwi = identifier_global_value (hwi);
2529 if (TREE_CODE (hwi) != TYPE_DECL)
2531 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2536 hwi = DECL_ORIGINAL_TYPE (hwi);
2538 if (hwi != long_integer_type_node
2539 && hwi != long_long_integer_type_node)
2541 error ("%<__gcc_host_wide_int__%> is not defined"
2542 " as %<long%> or %<long long%>");
2549 /* Assign the new data for use. */
2551 /* All the GCC diag formats use the same length specs. */
2553 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2554 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2555 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2556 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2557 diag_ls = (format_length_info *)
2558 xmemdup (gcc_diag_length_specs,
2559 sizeof (gcc_diag_length_specs),
2560 sizeof (gcc_diag_length_specs));
2563 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2564 i = find_length_info_modifier_index (diag_ls, 'w');
2565 if (hwi == long_integer_type_node)
2566 diag_ls[i].index = FMT_LEN_l;
2567 else if (hwi == long_long_integer_type_node)
2568 diag_ls[i].index = FMT_LEN_ll;
2573 /* Handle the __gcc_diag__ format specifics. */
2575 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2576 diag_fci = (format_char_info *)
2577 xmemdup (gcc_diag_char_table,
2578 sizeof (gcc_diag_char_table),
2579 sizeof (gcc_diag_char_table));
2582 i = find_char_info_specifier_index (diag_fci, 'H');
2583 diag_fci[i].types[0].type = &loc;
2584 diag_fci[i].pointer_count = 1;
2588 i = find_char_info_specifier_index (diag_fci, 'J');
2589 diag_fci[i].types[0].type = &t;
2590 diag_fci[i].pointer_count = 1;
2593 /* Handle the __gcc_tdiag__ format specifics. */
2595 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2596 tdiag_fci = (format_char_info *)
2597 xmemdup (gcc_tdiag_char_table,
2598 sizeof (gcc_tdiag_char_table),
2599 sizeof (gcc_tdiag_char_table));
2602 i = find_char_info_specifier_index (tdiag_fci, 'H');
2603 tdiag_fci[i].types[0].type = &loc;
2604 tdiag_fci[i].pointer_count = 1;
2608 /* All specifiers taking a tree share the same struct. */
2609 i = find_char_info_specifier_index (tdiag_fci, 'D');
2610 tdiag_fci[i].types[0].type = &t;
2611 tdiag_fci[i].pointer_count = 1;
2612 i = find_char_info_specifier_index (tdiag_fci, 'J');
2613 tdiag_fci[i].types[0].type = &t;
2614 tdiag_fci[i].pointer_count = 1;
2617 /* Handle the __gcc_cdiag__ format specifics. */
2619 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2620 cdiag_fci = (format_char_info *)
2621 xmemdup (gcc_cdiag_char_table,
2622 sizeof (gcc_cdiag_char_table),
2623 sizeof (gcc_cdiag_char_table));
2626 i = find_char_info_specifier_index (cdiag_fci, 'H');
2627 cdiag_fci[i].types[0].type = &loc;
2628 cdiag_fci[i].pointer_count = 1;
2632 /* All specifiers taking a tree share the same struct. */
2633 i = find_char_info_specifier_index (cdiag_fci, 'D');
2634 cdiag_fci[i].types[0].type = &t;
2635 cdiag_fci[i].pointer_count = 1;
2636 i = find_char_info_specifier_index (cdiag_fci, 'J');
2637 cdiag_fci[i].types[0].type = &t;
2638 cdiag_fci[i].pointer_count = 1;
2641 /* Handle the __gcc_cxxdiag__ format specifics. */
2643 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2644 cxxdiag_fci = (format_char_info *)
2645 xmemdup (gcc_cxxdiag_char_table,
2646 sizeof (gcc_cxxdiag_char_table),
2647 sizeof (gcc_cxxdiag_char_table));
2650 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2651 cxxdiag_fci[i].types[0].type = &loc;
2652 cxxdiag_fci[i].pointer_count = 1;
2656 /* All specifiers taking a tree share the same struct. */
2657 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2658 cxxdiag_fci[i].types[0].type = &t;
2659 cxxdiag_fci[i].pointer_count = 1;
2660 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2661 cxxdiag_fci[i].types[0].type = &t;
2662 cxxdiag_fci[i].pointer_count = 1;
2667 #ifdef TARGET_FORMAT_TYPES
2668 extern const format_kind_info TARGET_FORMAT_TYPES[];
2671 /* Handle a "format" attribute; arguments as in
2672 struct attribute_spec.handler. */
2674 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2675 int flags, bool *no_add_attrs)
2678 function_format_info info;
2681 #ifdef TARGET_FORMAT_TYPES
2682 /* If the target provides additional format types, we need to
2683 add them to FORMAT_TYPES at first use. */
2684 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2686 dynamic_format_types = xmalloc ((n_format_types + TARGET_N_FORMAT_TYPES)
2687 * sizeof (dynamic_format_types[0]));
2688 memcpy (dynamic_format_types, format_types_orig,
2689 sizeof (format_types_orig));
2690 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2691 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2693 format_types = dynamic_format_types;
2694 n_format_types += TARGET_N_FORMAT_TYPES;
2698 if (!decode_format_attr (args, &info, 0))
2700 *no_add_attrs = true;
2704 argument = TYPE_ARG_TYPES (type);
2707 if (!check_format_string (argument, info.format_num, flags,
2711 if (info.first_arg_num != 0)
2713 unsigned HOST_WIDE_INT arg_num = 1;
2715 /* Verify that first_arg_num points to the last arg,
2718 arg_num++, argument = TREE_CHAIN (argument);
2720 if (arg_num != info.first_arg_num)
2722 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2723 error ("args to be formatted is not %<...%>");
2724 *no_add_attrs = true;
2730 if (info.format_type == strftime_format_type && info.first_arg_num != 0)
2732 error ("strftime formats cannot format arguments");
2733 *no_add_attrs = true;
2737 /* If this is a custom GCC-internal format type, we have to
2738 initialize certain bits a runtime. */
2739 if (info.format_type == asm_fprintf_format_type
2740 || info.format_type == gcc_gfc_format_type
2741 || info.format_type == gcc_diag_format_type
2742 || info.format_type == gcc_tdiag_format_type
2743 || info.format_type == gcc_cdiag_format_type
2744 || info.format_type == gcc_cxxdiag_format_type)
2746 /* Our first time through, we have to make sure that our
2747 format_type data is allocated dynamically and is modifiable. */
2748 if (!dynamic_format_types)
2749 format_types = dynamic_format_types = (format_kind_info *)
2750 xmemdup (format_types_orig, sizeof (format_types_orig),
2751 sizeof (format_types_orig));
2753 /* If this is format __asm_fprintf__, we have to initialize
2754 GCC's notion of HOST_WIDE_INT for checking %wd. */
2755 if (info.format_type == asm_fprintf_format_type)
2756 init_dynamic_asm_fprintf_info ();
2757 /* If this is format __gcc_gfc__, we have to initialize GCC's
2758 notion of 'locus' at runtime for %L. */
2759 else if (info.format_type == gcc_gfc_format_type)
2760 init_dynamic_gfc_info ();
2761 /* If this is one of the diagnostic attributes, then we have to
2762 initialize 'location_t' and 'tree' at runtime. */
2763 else if (info.format_type == gcc_diag_format_type
2764 || info.format_type == gcc_tdiag_format_type
2765 || info.format_type == gcc_cdiag_format_type
2766 || info.format_type == gcc_cxxdiag_format_type)
2767 init_dynamic_diag_info ();