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>
536 The format %D provides a hexdump given a pointer and separator string:
537 ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
538 ("%*D", len, ptr, " ") -> XX XX XX XX ...
540 { "D", 1, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", &dfly_ext_char_info },
541 { "b", 0, STD_EXT, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", &dfly_ext_char_info },
542 { "ry", 0, STD_EXT, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "i", NULL },
543 { "z", 0, STD_EXT, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
544 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
547 static const format_char_info asm_fprintf_char_table[] =
549 /* C89 conversion specifiers. */
550 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
551 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
552 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
553 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
554 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
556 /* asm_fprintf conversion specifiers. */
557 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
558 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
559 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
560 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
561 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
562 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
563 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
564 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
567 static const format_char_info gcc_diag_char_table[] =
569 /* C89 conversion specifiers. */
570 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
571 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
572 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
573 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
574 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
575 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
577 /* Custom conversion specifiers. */
579 /* %H will require "location_t" at runtime. */
580 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
582 /* These will require a "tree" at runtime. */
583 { "JK", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
585 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
586 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
587 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
590 static const format_char_info gcc_tdiag_char_table[] =
592 /* C89 conversion specifiers. */
593 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
594 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
595 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
596 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
597 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
598 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
600 /* Custom conversion specifiers. */
602 /* %H will require "location_t" at runtime. */
603 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
605 /* These will require a "tree" at runtime. */
606 { "DFJKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
608 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
609 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
610 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
613 static const format_char_info gcc_cdiag_char_table[] =
615 /* C89 conversion specifiers. */
616 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
617 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
618 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
619 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
620 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
621 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
623 /* Custom conversion specifiers. */
625 /* %H will require "location_t" at runtime. */
626 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
628 /* These will require a "tree" at runtime. */
629 { "DEFJKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
631 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
632 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
633 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
636 static const format_char_info gcc_cxxdiag_char_table[] =
638 /* C89 conversion specifiers. */
639 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
640 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
641 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
642 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
643 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
644 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
646 /* Custom conversion specifiers. */
648 /* %H will require "location_t" at runtime. */
649 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
651 /* These will require a "tree" at runtime. */
652 { "ADEFJKTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
654 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
655 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
657 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
658 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
659 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
662 static const format_char_info gcc_gfc_char_table[] =
664 /* C89 conversion specifiers. */
665 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
666 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
667 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
668 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
670 /* gfc conversion specifiers. */
672 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
674 /* This will require a "locus" at runtime. */
675 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
677 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
680 static const format_char_info scan_char_table[] =
682 /* C89 conversion specifiers. */
683 { "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 },
684 { "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 },
685 { "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 },
686 { "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 },
687 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL },
688 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL },
689 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL },
690 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
691 { "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 },
692 /* C99 conversion specifiers. */
693 { "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 },
694 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
695 /* X/Open conversion specifiers. */
696 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL },
697 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL },
698 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
701 static const format_char_info time_char_table[] =
703 /* C89 conversion specifiers. */
704 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
705 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
706 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
707 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
708 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
709 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
710 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
711 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
712 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
713 /* C99 conversion specifiers. */
714 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
715 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
716 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
717 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
718 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
719 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
720 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
721 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
722 /* GNU conversion specifiers. */
723 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
724 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
725 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
728 static const format_char_info monetary_char_table[] =
730 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
731 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
734 /* This must be in the same order as enum format_type. */
735 static const format_kind_info format_types_orig[] =
737 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
738 printf_flag_specs, printf_flag_pairs,
739 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
740 'w', 0, 'p', 0, 'L', 0,
741 &integer_type_node, &integer_type_node
743 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
744 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
745 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
746 'w', 0, 'p', 0, 'L', 0,
749 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
750 gcc_diag_flag_specs, gcc_diag_flag_pairs,
751 FMT_FLAG_ARG_CONVERT,
752 0, 0, 'p', 0, 'L', 0,
753 NULL, &integer_type_node
755 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
756 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
757 FMT_FLAG_ARG_CONVERT,
758 0, 0, 'p', 0, 'L', 0,
759 NULL, &integer_type_node
761 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
762 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
763 FMT_FLAG_ARG_CONVERT,
764 0, 0, 'p', 0, 'L', 0,
765 NULL, &integer_type_node
767 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
768 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
769 FMT_FLAG_ARG_CONVERT,
770 0, 0, 'p', 0, 'L', 0,
771 NULL, &integer_type_node
773 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL,
774 NULL, gcc_gfc_flag_pairs,
775 FMT_FLAG_ARG_CONVERT,
779 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
780 scanf_flag_specs, scanf_flag_pairs,
781 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
782 'w', 0, 0, '*', 'L', 'm',
785 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
786 strftime_flag_specs, strftime_flag_pairs,
787 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
790 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
791 strfmon_flag_specs, strfmon_flag_pairs,
792 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
797 /* This layer of indirection allows GCC to reassign format_types with
798 new data if necessary, while still allowing the original data to be
800 static const format_kind_info *format_types = format_types_orig;
801 /* We can modify this one. We also add target-specific format types
802 to the end of the array. */
803 static format_kind_info *dynamic_format_types;
805 static int n_format_types = ARRAY_SIZE (format_types_orig);
807 /* Structure detailing the results of checking a format function call
808 where the format expression may be a conditional expression with
809 many leaves resulting from nested conditional expressions. */
812 /* Number of leaves of the format argument that could not be checked
813 as they were not string literals. */
814 int number_non_literal;
815 /* Number of leaves of the format argument that were null pointers or
816 string literals, but had extra format arguments. */
817 int number_extra_args;
818 /* Number of leaves of the format argument that were null pointers or
819 string literals, but had extra format arguments and used $ operand
821 int number_dollar_extra_args;
822 /* Number of leaves of the format argument that were wide string
825 /* Number of leaves of the format argument that were empty strings. */
827 /* Number of leaves of the format argument that were unterminated
829 int number_unterminated;
830 /* Number of leaves of the format argument that were not counted above. */
832 } format_check_results;
836 format_check_results *res;
837 function_format_info *info;
839 } format_check_context;
841 static void check_format_info (function_format_info *, tree);
842 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
843 static void check_format_info_main (format_check_results *,
844 function_format_info *,
845 const char *, int, tree,
846 unsigned HOST_WIDE_INT, alloc_pool);
848 static void init_dollar_format_checking (int, tree);
849 static int maybe_read_dollar_number (const char **, int,
850 tree, tree *, const format_kind_info *);
851 static bool avoid_dollar_number (const char *);
852 static void finish_dollar_format_checking (format_check_results *, int);
854 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
857 static void check_format_types (format_wanted_type *, const char *, int);
858 static void format_type_warning (const char *, const char *, int, tree,
859 int, const char *, tree, int);
861 /* Decode a format type from a string, returning the type, or
862 format_type_error if not valid, in which case the caller should print an
865 decode_format_type (const char *s)
870 s = convert_format_name_to_system_name (s);
872 for (i = 0; i < n_format_types; i++)
875 if (!strcmp (s, format_types[i].name))
877 alen = strlen (format_types[i].name);
878 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
879 && s[slen - 1] == '_' && s[slen - 2] == '_'
880 && !strncmp (s + 2, format_types[i].name, alen))
883 return format_type_error;
887 /* Check the argument list of a call to printf, scanf, etc.
888 ATTRS are the attributes on the function type. There are NARGS argument
889 values in the array ARGARRAY.
890 Also, if -Wmissing-format-attribute,
891 warn for calls to vprintf or vscanf in functions with no such format
892 attribute themselves. */
895 check_function_format (tree attrs, int nargs, tree *argarray)
899 /* See if this function has any format attributes. */
900 for (a = attrs; a; a = TREE_CHAIN (a))
902 if (is_attribute_p ("format", TREE_PURPOSE (a)))
905 function_format_info info;
906 decode_format_attr (TREE_VALUE (a), &info, 1);
909 /* FIXME: Rewrite all the internal functions in this file
910 to use the ARGARRAY directly instead of constructing this
912 tree params = NULL_TREE;
914 for (i = nargs - 1; i >= 0; i--)
915 params = tree_cons (NULL_TREE, argarray[i], params);
916 check_format_info (&info, params);
918 if (warn_missing_format_attribute && info.first_arg_num == 0
919 && (format_types[info.format_type].flags
920 & (int) FMT_FLAG_ARG_CONVERT))
923 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
926 if (is_attribute_p ("format", TREE_PURPOSE (c))
927 && (decode_format_type (IDENTIFIER_POINTER
928 (TREE_VALUE (TREE_VALUE (c))))
929 == info.format_type))
933 /* Check if the current function has a parameter to which
934 the format attribute could be attached; if not, it
935 can't be a candidate for a format attribute, despite
936 the vprintf-like or vscanf-like call. */
938 for (args = DECL_ARGUMENTS (current_function_decl);
940 args = TREE_CHAIN (args))
942 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
943 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
948 warning (OPT_Wmissing_format_attribute, "function might "
949 "be possible candidate for %qs format attribute",
950 format_types[info.format_type].name);
958 /* Variables used by the checking of $ operand number formats. */
959 static char *dollar_arguments_used = NULL;
960 static char *dollar_arguments_pointer_p = NULL;
961 static int dollar_arguments_alloc = 0;
962 static int dollar_arguments_count;
963 static int dollar_first_arg_num;
964 static int dollar_max_arg_used;
965 static int dollar_format_warned;
967 /* Initialize the checking for a format string that may contain $
968 parameter number specifications; we will need to keep track of whether
969 each parameter has been used. FIRST_ARG_NUM is the number of the first
970 argument that is a parameter to the format, or 0 for a vprintf-style
971 function; PARAMS is the list of arguments starting at this argument. */
974 init_dollar_format_checking (int first_arg_num, tree params)
976 tree oparams = params;
978 dollar_first_arg_num = first_arg_num;
979 dollar_arguments_count = 0;
980 dollar_max_arg_used = 0;
981 dollar_format_warned = 0;
982 if (first_arg_num > 0)
986 dollar_arguments_count++;
987 params = TREE_CHAIN (params);
990 if (dollar_arguments_alloc < dollar_arguments_count)
992 if (dollar_arguments_used)
993 free (dollar_arguments_used);
994 if (dollar_arguments_pointer_p)
995 free (dollar_arguments_pointer_p);
996 dollar_arguments_alloc = dollar_arguments_count;
997 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
998 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
1000 if (dollar_arguments_alloc)
1002 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1003 if (first_arg_num > 0)
1009 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1011 params = TREE_CHAIN (params);
1019 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1020 is set, it is an error if one is not found; otherwise, it is OK. If
1021 such a number is found, check whether it is within range and mark that
1022 numbered operand as being used for later checking. Returns the operand
1023 number if found and within range, zero if no such number was found and
1024 this is OK, or -1 on error. PARAMS points to the first operand of the
1025 format; PARAM_PTR is made to point to the parameter referred to. If
1026 a $ format is found, *FORMAT is updated to point just after it. */
1029 maybe_read_dollar_number (const char **format,
1030 int dollar_needed, tree params, tree *param_ptr,
1031 const format_kind_info *fki)
1035 const char *fcp = *format;
1036 if (!ISDIGIT (*fcp))
1040 warning (OPT_Wformat, "missing $ operand number in format");
1048 while (ISDIGIT (*fcp))
1051 nargnum = 10 * argnum + (*fcp - '0');
1052 if (nargnum < 0 || nargnum / 10 != argnum)
1061 warning (OPT_Wformat, "missing $ operand number in format");
1068 if (pedantic && !dollar_format_warned)
1070 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1071 C_STD_NAME (STD_EXT));
1072 dollar_format_warned = 1;
1074 if (overflow_flag || argnum == 0
1075 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1077 warning (OPT_Wformat, "operand number out of range in format");
1080 if (argnum > dollar_max_arg_used)
1081 dollar_max_arg_used = argnum;
1082 /* For vprintf-style functions we may need to allocate more memory to
1083 track which arguments are used. */
1084 while (dollar_arguments_alloc < dollar_max_arg_used)
1087 nalloc = 2 * dollar_arguments_alloc + 16;
1088 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1090 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1092 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1093 nalloc - dollar_arguments_alloc);
1094 dollar_arguments_alloc = nalloc;
1096 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1097 && dollar_arguments_used[argnum - 1] == 1)
1099 dollar_arguments_used[argnum - 1] = 2;
1100 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1104 dollar_arguments_used[argnum - 1] = 1;
1105 if (dollar_first_arg_num)
1108 *param_ptr = params;
1109 for (i = 1; i < argnum && *param_ptr != 0; i++)
1110 *param_ptr = TREE_CHAIN (*param_ptr);
1112 /* This case shouldn't be caught here. */
1113 gcc_assert (*param_ptr);
1120 /* Ensure that FORMAT does not start with a decimal number followed by
1121 a $; give a diagnostic and return true if it does, false otherwise. */
1124 avoid_dollar_number (const char *format)
1126 if (!ISDIGIT (*format))
1128 while (ISDIGIT (*format))
1132 warning (OPT_Wformat, "$ operand number used after format without operand number");
1139 /* Finish the checking for a format string that used $ operand number formats
1140 instead of non-$ formats. We check for unused operands before used ones
1141 (a serious error, since the implementation of the format function
1142 can't know what types to pass to va_arg to find the later arguments).
1143 and for unused operands at the end of the format (if we know how many
1144 arguments the format had, so not for vprintf). If there were operand
1145 numbers out of range on a non-vprintf-style format, we won't have reached
1146 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1150 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1153 bool found_pointer_gap = false;
1154 for (i = 0; i < dollar_max_arg_used; i++)
1156 if (!dollar_arguments_used[i])
1158 if (pointer_gap_ok && (dollar_first_arg_num == 0
1159 || dollar_arguments_pointer_p[i]))
1160 found_pointer_gap = true;
1162 warning (OPT_Wformat,
1163 "format argument %d unused before used argument %d in $-style format",
1164 i + 1, dollar_max_arg_used);
1167 if (found_pointer_gap
1168 || (dollar_first_arg_num
1169 && dollar_max_arg_used < dollar_arguments_count))
1171 res->number_other--;
1172 res->number_dollar_extra_args++;
1177 /* Retrieve the specification for a format flag. SPEC contains the
1178 specifications for format flags for the applicable kind of format.
1179 FLAG is the flag in question. If PREDICATES is NULL, the basic
1180 spec for that flag must be retrieved and must exist. If
1181 PREDICATES is not NULL, it is a string listing possible predicates
1182 for the spec entry; if an entry predicated on any of these is
1183 found, it is returned, otherwise NULL is returned. */
1185 static const format_flag_spec *
1186 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1189 for (i = 0; spec[i].flag_char != 0; i++)
1191 if (spec[i].flag_char != flag)
1193 if (predicates != NULL)
1195 if (spec[i].predicate != 0
1196 && strchr (predicates, spec[i].predicate) != 0)
1199 else if (spec[i].predicate == 0)
1202 gcc_assert (predicates);
1207 /* Check the argument list of a call to printf, scanf, etc.
1208 INFO points to the function_format_info structure.
1209 PARAMS is the list of argument values. */
1212 check_format_info (function_format_info *info, tree params)
1214 format_check_context format_ctx;
1215 unsigned HOST_WIDE_INT arg_num;
1217 format_check_results res;
1218 /* Skip to format argument. If the argument isn't available, there's
1219 no work for us to do; prototype checking will catch the problem. */
1220 for (arg_num = 1; ; ++arg_num)
1224 if (arg_num == info->format_num)
1226 params = TREE_CHAIN (params);
1228 format_tree = TREE_VALUE (params);
1229 params = TREE_CHAIN (params);
1230 if (format_tree == 0)
1233 res.number_non_literal = 0;
1234 res.number_extra_args = 0;
1235 res.number_dollar_extra_args = 0;
1236 res.number_wide = 0;
1237 res.number_empty = 0;
1238 res.number_unterminated = 0;
1239 res.number_other = 0;
1241 format_ctx.res = &res;
1242 format_ctx.info = info;
1243 format_ctx.params = params;
1245 check_function_arguments_recurse (check_format_arg, &format_ctx,
1246 format_tree, arg_num);
1248 if (res.number_non_literal > 0)
1250 /* Functions taking a va_list normally pass a non-literal format
1251 string. These functions typically are declared with
1252 first_arg_num == 0, so avoid warning in those cases. */
1253 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1255 /* For strftime-like formats, warn for not checking the format
1256 string; but there are no arguments to check. */
1257 warning (OPT_Wformat_nonliteral,
1258 "format not a string literal, format string not checked");
1260 else if (info->first_arg_num != 0)
1262 /* If there are no arguments for the format at all, we may have
1263 printf (foo) which is likely to be a security hole. */
1264 while (arg_num + 1 < info->first_arg_num)
1268 params = TREE_CHAIN (params);
1271 if (params == 0 && warn_format_security)
1272 warning (OPT_Wformat_security,
1273 "format not a string literal and no format arguments");
1274 else if (params == 0 && warn_format_nonliteral)
1275 warning (OPT_Wformat_nonliteral,
1276 "format not a string literal and no format arguments");
1278 warning (OPT_Wformat_nonliteral,
1279 "format not a string literal, argument types not checked");
1283 /* If there were extra arguments to the format, normally warn. However,
1284 the standard does say extra arguments are ignored, so in the specific
1285 case where we have multiple leaves (conditional expressions or
1286 ngettext) allow extra arguments if at least one leaf didn't have extra
1287 arguments, but was otherwise OK (either non-literal or checked OK).
1288 If the format is an empty string, this should be counted similarly to the
1289 case of extra format arguments. */
1290 if (res.number_extra_args > 0 && res.number_non_literal == 0
1291 && res.number_other == 0)
1292 warning (OPT_Wformat_extra_args, "too many arguments for format");
1293 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1294 && res.number_other == 0)
1295 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1296 if (res.number_empty > 0 && res.number_non_literal == 0
1297 && res.number_other == 0)
1298 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1299 format_types[info->format_type].name);
1301 if (res.number_wide > 0)
1302 warning (OPT_Wformat, "format is a wide character string");
1304 if (res.number_unterminated > 0)
1305 warning (OPT_Wformat, "unterminated format string");
1308 /* Callback from check_function_arguments_recurse to check a
1309 format string. FORMAT_TREE is the format parameter. ARG_NUM
1310 is the number of the format argument. CTX points to a
1311 format_check_context. */
1314 check_format_arg (void *ctx, tree format_tree,
1315 unsigned HOST_WIDE_INT arg_num)
1317 format_check_context *format_ctx = (format_check_context *) ctx;
1318 format_check_results *res = format_ctx->res;
1319 function_format_info *info = format_ctx->info;
1320 tree params = format_ctx->params;
1323 HOST_WIDE_INT offset;
1324 const char *format_chars;
1325 tree array_size = 0;
1327 alloc_pool fwt_pool;
1329 if (integer_zerop (format_tree))
1331 /* Skip to first argument to check, so we can see if this format
1332 has any arguments (it shouldn't). */
1333 while (arg_num + 1 < info->first_arg_num)
1337 params = TREE_CHAIN (params);
1342 res->number_other++;
1344 res->number_extra_args++;
1350 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1354 arg0 = TREE_OPERAND (format_tree, 0);
1355 arg1 = TREE_OPERAND (format_tree, 1);
1358 if (TREE_CODE (arg1) == INTEGER_CST)
1362 res->number_non_literal++;
1365 if (!host_integerp (arg1, 0)
1366 || (offset = tree_low_cst (arg1, 0)) < 0)
1368 res->number_non_literal++;
1372 if (TREE_CODE (format_tree) != ADDR_EXPR)
1374 res->number_non_literal++;
1377 format_tree = TREE_OPERAND (format_tree, 0);
1378 if (TREE_CODE (format_tree) == ARRAY_REF
1379 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1380 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1381 format_tree = TREE_OPERAND (format_tree, 0);
1382 if (TREE_CODE (format_tree) == VAR_DECL
1383 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1384 && (array_init = decl_constant_value (format_tree)) != format_tree
1385 && TREE_CODE (array_init) == STRING_CST)
1387 /* Extract the string constant initializer. Note that this may include
1388 a trailing NUL character that is not in the array (e.g.
1389 const char a[3] = "foo";). */
1390 array_size = DECL_SIZE_UNIT (format_tree);
1391 format_tree = array_init;
1393 if (TREE_CODE (format_tree) != STRING_CST)
1395 res->number_non_literal++;
1398 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1403 format_chars = TREE_STRING_POINTER (format_tree);
1404 format_length = TREE_STRING_LENGTH (format_tree);
1405 if (array_size != 0)
1407 /* Variable length arrays can't be initialized. */
1408 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1410 if (host_integerp (array_size, 0))
1412 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1413 if (array_size_value > 0
1414 && array_size_value == (int) array_size_value
1415 && format_length > array_size_value)
1416 format_length = array_size_value;
1421 if (offset >= format_length)
1423 res->number_non_literal++;
1426 format_chars += offset;
1427 format_length -= offset;
1429 if (format_length < 1 || format_chars[--format_length] != 0)
1431 res->number_unterminated++;
1434 if (format_length == 0)
1436 res->number_empty++;
1440 /* Skip to first argument to check. */
1441 while (arg_num + 1 < info->first_arg_num)
1445 params = TREE_CHAIN (params);
1448 /* Provisionally increment res->number_other; check_format_info_main
1449 will decrement it if it finds there are extra arguments, but this way
1450 need not adjust it for every return. */
1451 res->number_other++;
1452 fwt_pool = create_alloc_pool ("format_wanted_type pool",
1453 sizeof (format_wanted_type), 10);
1454 check_format_info_main (res, info, format_chars, format_length,
1455 params, arg_num, fwt_pool);
1456 free_alloc_pool (fwt_pool);
1460 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1461 is the NUL-terminated format string (which at this point may contain
1462 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1463 terminating NUL character). ARG_NUM is one less than the number of
1464 the first format argument to check; PARAMS points to that format
1465 argument in the list of arguments. */
1468 check_format_info_main (format_check_results *res,
1469 function_format_info *info, const char *format_chars,
1470 int format_length, tree params,
1471 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool)
1473 const char *orig_format_chars = format_chars;
1474 tree first_fillin_param = params;
1476 const format_kind_info *fki = &format_types[info->format_type];
1477 const format_flag_spec *flag_specs = fki->flag_specs;
1478 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1480 /* -1 if no conversions taking an operand have been found; 0 if one has
1481 and it didn't use $; 1 if $ formats are in use. */
1482 int has_operand_number = -1;
1484 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1489 int suppressed = FALSE;
1490 const char *length_chars = NULL;
1491 enum format_lengths length_chars_val = FMT_LEN_none;
1492 enum format_std_version length_chars_std = STD_C89;
1496 int main_arg_num = 0;
1497 tree main_arg_params = 0;
1498 enum format_std_version wanted_type_std;
1499 const char *wanted_type_name;
1500 format_wanted_type width_wanted_type;
1501 format_wanted_type precision_wanted_type;
1502 format_wanted_type main_wanted_type;
1503 format_wanted_type *first_wanted_type = NULL;
1504 format_wanted_type *last_wanted_type = NULL;
1505 const format_length_info *fli = NULL;
1506 const format_char_info *fci = NULL;
1507 char flag_chars[256];
1509 const char *format_start = format_chars;
1510 if (*format_chars == 0)
1512 if (format_chars - orig_format_chars != format_length)
1513 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
1514 if (info->first_arg_num != 0 && params != 0
1515 && has_operand_number <= 0)
1517 res->number_other--;
1518 res->number_extra_args++;
1520 if (has_operand_number > 0)
1521 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1524 if (*format_chars++ != '%')
1526 if (*format_chars == 0)
1528 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1531 if (*format_chars == '%')
1538 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1540 /* Possibly read a $ operand number at the start of the format.
1541 If one was previously used, one is required here. If one
1542 is not used here, we can't immediately conclude this is a
1543 format without them, since it could be printf %m or scanf %*. */
1545 opnum = maybe_read_dollar_number (&format_chars, 0,
1547 &main_arg_params, fki);
1552 has_operand_number = 1;
1553 main_arg_num = opnum + info->first_arg_num - 1;
1556 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1558 if (avoid_dollar_number (format_chars))
1562 /* Read any format flags, but do not yet validate them beyond removing
1563 duplicates, since in general validation depends on the rest of
1565 while (*format_chars != 0
1566 && strchr (fki->flag_chars, *format_chars) != 0)
1568 const format_flag_spec *s = get_flag_spec (flag_specs,
1569 *format_chars, NULL);
1570 if (strchr (flag_chars, *format_chars) != 0)
1572 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1576 i = strlen (flag_chars);
1577 flag_chars[i++] = *format_chars;
1580 if (s->skip_next_char)
1583 if (*format_chars == 0)
1585 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1592 /* Read any format width, possibly * or *m$. */
1593 if (fki->width_char != 0)
1595 if (fki->width_type != NULL && *format_chars == '*')
1597 i = strlen (flag_chars);
1598 flag_chars[i++] = fki->width_char;
1600 /* "...a field width...may be indicated by an asterisk.
1601 In this case, an int argument supplies the field width..." */
1603 if (has_operand_number != 0)
1606 opnum = maybe_read_dollar_number (&format_chars,
1607 has_operand_number == 1,
1614 has_operand_number = 1;
1615 arg_num = opnum + info->first_arg_num - 1;
1618 has_operand_number = 0;
1622 if (avoid_dollar_number (format_chars))
1625 if (info->first_arg_num != 0)
1629 warning (OPT_Wformat, "too few arguments for format");
1632 cur_param = TREE_VALUE (params);
1633 if (has_operand_number <= 0)
1635 params = TREE_CHAIN (params);
1638 width_wanted_type.wanted_type = *fki->width_type;
1639 width_wanted_type.wanted_type_name = NULL;
1640 width_wanted_type.pointer_count = 0;
1641 width_wanted_type.char_lenient_flag = 0;
1642 width_wanted_type.writing_in_flag = 0;
1643 width_wanted_type.reading_from_flag = 0;
1644 width_wanted_type.name = _("field width");
1645 width_wanted_type.param = cur_param;
1646 width_wanted_type.arg_num = arg_num;
1647 width_wanted_type.next = NULL;
1648 if (last_wanted_type != 0)
1649 last_wanted_type->next = &width_wanted_type;
1650 if (first_wanted_type == 0)
1651 first_wanted_type = &width_wanted_type;
1652 last_wanted_type = &width_wanted_type;
1657 /* Possibly read a numeric width. If the width is zero,
1658 we complain if appropriate. */
1659 int non_zero_width_char = FALSE;
1660 int found_width = FALSE;
1661 while (ISDIGIT (*format_chars))
1664 if (*format_chars != '0')
1665 non_zero_width_char = TRUE;
1668 if (found_width && !non_zero_width_char &&
1669 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1670 warning (OPT_Wformat, "zero width in %s format", fki->name);
1673 i = strlen (flag_chars);
1674 flag_chars[i++] = fki->width_char;
1680 /* Read any format left precision (must be a number, not *). */
1681 if (fki->left_precision_char != 0 && *format_chars == '#')
1684 i = strlen (flag_chars);
1685 flag_chars[i++] = fki->left_precision_char;
1687 if (!ISDIGIT (*format_chars))
1688 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1689 while (ISDIGIT (*format_chars))
1693 /* Read any format precision, possibly * or *m$. */
1694 if (fki->precision_char != 0 && *format_chars == '.')
1697 i = strlen (flag_chars);
1698 flag_chars[i++] = fki->precision_char;
1700 if (fki->precision_type != NULL && *format_chars == '*')
1702 /* "...a...precision...may be indicated by an asterisk.
1703 In this case, an int argument supplies the...precision." */
1705 if (has_operand_number != 0)
1708 opnum = maybe_read_dollar_number (&format_chars,
1709 has_operand_number == 1,
1716 has_operand_number = 1;
1717 arg_num = opnum + info->first_arg_num - 1;
1720 has_operand_number = 0;
1724 if (avoid_dollar_number (format_chars))
1727 if (info->first_arg_num != 0)
1731 warning (OPT_Wformat, "too few arguments for format");
1734 cur_param = TREE_VALUE (params);
1735 if (has_operand_number <= 0)
1737 params = TREE_CHAIN (params);
1740 precision_wanted_type.wanted_type = *fki->precision_type;
1741 precision_wanted_type.wanted_type_name = NULL;
1742 precision_wanted_type.pointer_count = 0;
1743 precision_wanted_type.char_lenient_flag = 0;
1744 precision_wanted_type.writing_in_flag = 0;
1745 precision_wanted_type.reading_from_flag = 0;
1746 precision_wanted_type.name = _("field precision");
1747 precision_wanted_type.param = cur_param;
1748 precision_wanted_type.arg_num = arg_num;
1749 precision_wanted_type.next = NULL;
1750 if (last_wanted_type != 0)
1751 last_wanted_type->next = &precision_wanted_type;
1752 if (first_wanted_type == 0)
1753 first_wanted_type = &precision_wanted_type;
1754 last_wanted_type = &precision_wanted_type;
1759 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1760 && !ISDIGIT (*format_chars))
1761 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1762 while (ISDIGIT (*format_chars))
1767 if (fki->alloc_char && fki->alloc_char == *format_chars)
1769 i = strlen (flag_chars);
1770 flag_chars[i++] = fki->alloc_char;
1775 /* Handle the scanf allocation kludge. */
1776 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1778 if (*format_chars == 'a' && !flag_isoc99)
1780 if (format_chars[1] == 's' || format_chars[1] == 'S'
1781 || format_chars[1] == '[')
1783 /* 'a' is used as a flag. */
1784 i = strlen (flag_chars);
1785 flag_chars[i++] = 'a';
1792 /* Read any length modifier, if this kind of format has them. */
1793 fli = fki->length_char_specs;
1794 length_chars = NULL;
1795 length_chars_val = FMT_LEN_none;
1796 length_chars_std = STD_C89;
1799 while (fli->name != 0
1800 && strncmp (fli->name, format_chars, strlen (fli->name)))
1803 * DragonFly's D conversion needs to have precedence
1804 * over the DD length modifier
1806 if (fli->index == FMT_LEN_D
1807 && fki->conversion_specs == print_char_table)
1808 while (fli->name != 0)
1812 format_chars += strlen (fli->name);
1813 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1816 length_chars = fli->double_name;
1817 length_chars_val = fli->double_index;
1818 length_chars_std = fli->double_std;
1822 length_chars = fli->name;
1823 length_chars_val = fli->index;
1824 length_chars_std = fli->std;
1826 i = strlen (flag_chars);
1827 flag_chars[i++] = fki->length_code_char;
1832 /* Warn if the length modifier is non-standard. */
1833 if (ADJ_STD (length_chars_std) > C_STD_VER)
1834 warning (OPT_Wformat,
1835 "%s does not support the %qs %s length modifier",
1836 C_STD_NAME (length_chars_std), length_chars,
1841 /* Read any modifier (strftime E/O). */
1842 if (fki->modifier_chars != NULL)
1844 while (*format_chars != 0
1845 && strchr (fki->modifier_chars, *format_chars) != 0)
1847 if (strchr (flag_chars, *format_chars) != 0)
1849 const format_flag_spec *s = get_flag_spec (flag_specs,
1850 *format_chars, NULL);
1851 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1855 i = strlen (flag_chars);
1856 flag_chars[i++] = *format_chars;
1863 format_char = *format_chars;
1864 if (format_char == 0
1865 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1866 && format_char == '%'))
1868 warning (OPT_Wformat, "conversion lacks type at end of format");
1872 fci = fki->conversion_specs;
1873 while (fci->format_chars != 0
1874 && strchr (fci->format_chars, format_char) == 0)
1876 if (fci->format_chars == 0)
1878 if (ISGRAPH (format_char))
1879 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1882 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1888 if (ADJ_STD (fci->std) > C_STD_VER)
1889 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1890 C_STD_NAME (fci->std), format_char, fki->name);
1893 /* Validate the individual flags used, removing any that are invalid. */
1896 for (i = 0; flag_chars[i] != 0; i++)
1898 const format_flag_spec *s = get_flag_spec (flag_specs,
1899 flag_chars[i], NULL);
1900 flag_chars[i - d] = flag_chars[i];
1901 if (flag_chars[i] == fki->length_code_char)
1903 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1905 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1906 _(s->name), format_char, fki->name);
1912 const format_flag_spec *t;
1913 if (ADJ_STD (s->std) > C_STD_VER)
1914 warning (OPT_Wformat, "%s does not support %s",
1915 C_STD_NAME (s->std), _(s->long_name));
1916 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1917 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1919 const char *long_name = (t->long_name != NULL
1922 if (ADJ_STD (t->std) > C_STD_VER)
1923 warning (OPT_Wformat,
1924 "%s does not support %s with the %<%%%c%> %s format",
1925 C_STD_NAME (t->std), _(long_name),
1926 format_char, fki->name);
1930 flag_chars[i - d] = 0;
1933 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1934 && strchr (flag_chars, 'a') != 0)
1936 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0)
1939 if (fki->suppression_char
1940 && strchr (flag_chars, fki->suppression_char) != 0)
1943 /* Validate the pairs of flags used. */
1944 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1946 const format_flag_spec *s, *t;
1947 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1949 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1951 if (bad_flag_pairs[i].predicate != 0
1952 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1954 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1955 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1956 if (bad_flag_pairs[i].ignored)
1958 if (bad_flag_pairs[i].predicate != 0)
1959 warning (OPT_Wformat,
1960 "%s ignored with %s and %<%%%c%> %s format",
1961 _(s->name), _(t->name), format_char,
1964 warning (OPT_Wformat, "%s ignored with %s in %s format",
1965 _(s->name), _(t->name), fki->name);
1969 if (bad_flag_pairs[i].predicate != 0)
1970 warning (OPT_Wformat,
1971 "use of %s and %s together with %<%%%c%> %s format",
1972 _(s->name), _(t->name), format_char,
1975 warning (OPT_Wformat, "use of %s and %s together in %s format",
1976 _(s->name), _(t->name), fki->name);
1980 /* Give Y2K warnings. */
1981 if (warn_format_y2k)
1984 if (strchr (fci->flags2, '4') != 0)
1985 if (strchr (flag_chars, 'E') != 0)
1989 else if (strchr (fci->flags2, '3') != 0)
1991 else if (strchr (fci->flags2, '2') != 0)
1994 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1995 "year in some locales", format_char);
1996 else if (y2k_level == 2)
1997 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1998 "year", format_char);
2001 if (strchr (fci->flags2, '[') != 0)
2003 /* Skip over scan set, in case it happens to have '%' in it. */
2004 if (*format_chars == '^')
2006 /* Find closing bracket; if one is hit immediately, then
2007 it's part of the scan set rather than a terminator. */
2008 if (*format_chars == ']')
2010 while (*format_chars && *format_chars != ']')
2012 if (*format_chars != ']')
2013 /* The end of the format string was reached. */
2014 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
2018 wanted_type_name = 0;
2019 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
2021 wanted_type = (fci->types[length_chars_val].type
2022 ? *fci->types[length_chars_val].type : 0);
2023 wanted_type_name = fci->types[length_chars_val].name;
2024 wanted_type_std = fci->types[length_chars_val].std;
2025 if (wanted_type == 0)
2027 warning (OPT_Wformat,
2028 "use of %qs length modifier with %qc type character",
2029 length_chars, format_char);
2030 /* Heuristic: skip one argument when an invalid length/type
2031 combination is encountered. */
2035 warning (OPT_Wformat, "too few arguments for format");
2038 params = TREE_CHAIN (params);
2042 /* Warn if non-standard, provided it is more non-standard
2043 than the length and type characters that may already
2044 have been warned for. */
2045 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2046 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2048 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2049 warning (OPT_Wformat,
2050 "%s does not support the %<%%%s%c%> %s format",
2051 C_STD_NAME (wanted_type_std), length_chars,
2052 format_char, fki->name);
2056 main_wanted_type.next = NULL;
2058 /* Finally. . .check type of argument against desired type! */
2059 if (info->first_arg_num == 0)
2061 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2064 if (main_arg_num != 0)
2067 warning (OPT_Wformat, "operand number specified with "
2068 "suppressed assignment");
2070 warning (OPT_Wformat, "operand number specified for format "
2071 "taking no argument");
2076 format_wanted_type *wanted_type_ptr;
2078 if (main_arg_num != 0)
2080 arg_num = main_arg_num;
2081 params = main_arg_params;
2086 if (has_operand_number > 0)
2088 warning (OPT_Wformat, "missing $ operand number in format");
2092 has_operand_number = 0;
2095 wanted_type_ptr = &main_wanted_type;
2100 warning (OPT_Wformat, "too few arguments for format");
2104 cur_param = TREE_VALUE (params);
2105 params = TREE_CHAIN (params);
2107 wanted_type_ptr->wanted_type = wanted_type;
2108 wanted_type_ptr->wanted_type_name = wanted_type_name;
2109 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2110 wanted_type_ptr->char_lenient_flag = 0;
2111 if (strchr (fci->flags2, 'c') != 0)
2112 wanted_type_ptr->char_lenient_flag = 1;
2113 wanted_type_ptr->writing_in_flag = 0;
2114 wanted_type_ptr->reading_from_flag = 0;
2116 wanted_type_ptr->writing_in_flag = 1;
2119 if (strchr (fci->flags2, 'W') != 0)
2120 wanted_type_ptr->writing_in_flag = 1;
2121 if (strchr (fci->flags2, 'R') != 0)
2122 wanted_type_ptr->reading_from_flag = 1;
2124 wanted_type_ptr->name = NULL;
2125 wanted_type_ptr->param = cur_param;
2126 wanted_type_ptr->arg_num = arg_num;
2127 wanted_type_ptr->next = NULL;
2128 if (last_wanted_type != 0)
2129 last_wanted_type->next = wanted_type_ptr;
2130 if (first_wanted_type == 0)
2131 first_wanted_type = wanted_type_ptr;
2132 last_wanted_type = wanted_type_ptr;
2137 wanted_type_ptr = (format_wanted_type *)
2138 pool_alloc (fwt_pool);
2140 wanted_type = *fci->types[length_chars_val].type;
2141 wanted_type_name = fci->types[length_chars_val].name;
2146 if (first_wanted_type != 0)
2147 check_format_types (first_wanted_type, format_start,
2148 format_chars - format_start);
2153 /* Check the argument types from a single format conversion (possibly
2154 including width and precision arguments). */
2156 check_format_types (format_wanted_type *types, const char *format_start,
2159 for (; types != 0; types = types->next)
2168 cur_param = types->param;
2169 cur_type = TREE_TYPE (cur_param);
2170 if (cur_type == error_mark_node)
2172 orig_cur_type = cur_type;
2174 wanted_type = types->wanted_type;
2175 arg_num = types->arg_num;
2177 /* The following should not occur here. */
2178 gcc_assert (wanted_type);
2179 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2181 if (types->pointer_count == 0)
2182 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2184 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2186 STRIP_NOPS (cur_param);
2188 /* Check the types of any additional pointer arguments
2189 that precede the "real" argument. */
2190 for (i = 0; i < types->pointer_count; ++i)
2192 if (TREE_CODE (cur_type) == POINTER_TYPE)
2194 cur_type = TREE_TYPE (cur_type);
2195 if (cur_type == error_mark_node)
2198 /* Check for writing through a NULL pointer. */
2199 if (types->writing_in_flag
2202 && integer_zerop (cur_param))
2203 warning (OPT_Wformat, "writing through null pointer "
2204 "(argument %d)", arg_num);
2206 /* Check for reading through a NULL pointer. */
2207 if (types->reading_from_flag
2210 && integer_zerop (cur_param))
2211 warning (OPT_Wformat, "reading through null pointer "
2212 "(argument %d)", arg_num);
2214 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2215 cur_param = TREE_OPERAND (cur_param, 0);
2219 /* See if this is an attempt to write into a const type with
2220 scanf or with printf "%n". Note: the writing in happens
2221 at the first indirection only, if for example
2222 void * const * is passed to scanf %p; passing
2223 const void ** is simply passing an incompatible type. */
2224 if (types->writing_in_flag
2226 && (TYPE_READONLY (cur_type)
2228 && (CONSTANT_CLASS_P (cur_param)
2229 || (DECL_P (cur_param)
2230 && TREE_READONLY (cur_param))))))
2231 warning (OPT_Wformat, "writing into constant object "
2232 "(argument %d)", arg_num);
2234 /* If there are extra type qualifiers beyond the first
2235 indirection, then this makes the types technically
2239 && (TYPE_READONLY (cur_type)
2240 || TYPE_VOLATILE (cur_type)
2241 || TYPE_RESTRICT (cur_type)))
2242 warning (OPT_Wformat, "extra type qualifiers in format "
2243 "argument (argument %d)",
2249 format_type_warning (types->name, format_start, format_length,
2250 wanted_type, types->pointer_count,
2251 types->wanted_type_name, orig_cur_type,
2257 if (i < types->pointer_count)
2260 cur_type = TYPE_MAIN_VARIANT (cur_type);
2262 /* Check whether the argument type is a character type. This leniency
2263 only applies to certain formats, flagged with 'c'.
2265 if (types->char_lenient_flag)
2266 char_type_flag = (cur_type == char_type_node
2267 || cur_type == signed_char_type_node
2268 || cur_type == unsigned_char_type_node);
2270 /* Check the type of the "real" argument, if there's a type we want. */
2271 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2273 /* If we want 'void *', allow any pointer type.
2274 (Anything else would already have got a warning.)
2275 With -pedantic, only allow pointers to void and to character
2277 if (wanted_type == void_type_node
2278 && (!pedantic || (i == 1 && char_type_flag)))
2280 /* Don't warn about differences merely in signedness, unless
2281 -pedantic. With -pedantic, warn if the type is a pointer
2282 target and not a character type, and for character types at
2283 a second level of indirection. */
2284 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2285 && TREE_CODE (cur_type) == INTEGER_TYPE
2286 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2287 && (TYPE_UNSIGNED (wanted_type)
2288 ? wanted_type == c_common_unsigned_type (cur_type)
2289 : wanted_type == c_common_signed_type (cur_type)))
2291 /* Likewise, "signed char", "unsigned char" and "char" are
2292 equivalent but the above test won't consider them equivalent. */
2293 if (wanted_type == char_type_node
2294 && (!pedantic || i < 2)
2297 /* Now we have a type mismatch. */
2298 format_type_warning (types->name, format_start, format_length,
2299 wanted_type, types->pointer_count,
2300 types->wanted_type_name, orig_cur_type, arg_num);
2305 /* Give a warning about a format argument of different type from that
2306 expected. DESCR is a description such as "field precision", or
2307 NULL for an ordinary format. For an ordinary format, FORMAT_START
2308 points to where the format starts in the format string and
2309 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2310 should have after POINTER_COUNT pointer dereferences.
2311 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2312 or NULL if the ordinary name of the type should be used. ARG_TYPE
2313 is the type of the actual argument. ARG_NUM is the number of that
2316 format_type_warning (const char *descr, const char *format_start,
2317 int format_length, tree wanted_type, int pointer_count,
2318 const char *wanted_type_name, tree arg_type, int arg_num)
2321 /* If ARG_TYPE is a typedef with a misleading name (for example,
2322 size_t but not the standard size_t expected by printf %zu), avoid
2323 printing the typedef name. */
2324 if (wanted_type_name
2325 && TYPE_NAME (arg_type)
2326 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2327 && DECL_NAME (TYPE_NAME (arg_type))
2328 && !strcmp (wanted_type_name,
2329 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2330 arg_type = TYPE_MAIN_VARIANT (arg_type);
2331 /* The format type and name exclude any '*' for pointers, so those
2332 must be formatted manually. For all the types we currently have,
2333 this is adequate, but formats taking pointers to functions or
2334 arrays would require the full type to be built up in order to
2335 print it with %T. */
2336 p = (char *) alloca (pointer_count + 2);
2337 if (pointer_count == 0)
2339 else if (c_dialect_cxx ())
2341 memset (p, '*', pointer_count);
2342 p[pointer_count] = 0;
2347 memset (p + 1, '*', pointer_count);
2348 p[pointer_count + 1] = 0;
2350 if (wanted_type_name)
2353 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2354 "but argument %d has type %qT",
2355 descr, wanted_type_name, p, arg_num, arg_type);
2357 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2358 "but argument %d has type %qT",
2359 format_length, format_start, wanted_type_name, p,
2365 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2366 "but argument %d has type %qT",
2367 descr, wanted_type, p, arg_num, arg_type);
2369 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2370 "but argument %d has type %qT",
2371 format_length, format_start, wanted_type, p, arg_num, arg_type);
2376 /* Given a format_char_info array FCI, and a character C, this function
2377 returns the index into the conversion_specs where that specifier's
2378 data is located. The character must exist. */
2380 find_char_info_specifier_index (const format_char_info *fci, int c)
2384 for (i = 0; fci->format_chars; i++, fci++)
2385 if (strchr (fci->format_chars, c))
2388 /* We shouldn't be looking for a non-existent specifier. */
2392 /* Given a format_length_info array FLI, and a character C, this
2393 function returns the index into the conversion_specs where that
2394 modifier's data is located. The character must exist. */
2396 find_length_info_modifier_index (const format_length_info *fli, int c)
2400 for (i = 0; fli->name; i++, fli++)
2401 if (strchr (fli->name, c))
2404 /* We shouldn't be looking for a non-existent modifier. */
2408 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2409 use in GCC's __asm_fprintf__ custom format attribute. You must
2410 have set dynamic_format_types before calling this function. */
2412 init_dynamic_asm_fprintf_info (void)
2418 format_length_info *new_asm_fprintf_length_specs;
2421 /* Find the underlying type for HOST_WIDE_INT. For the %w
2422 length modifier to work, one must have issued: "typedef
2423 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2424 prior to using that modifier. */
2425 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2428 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2431 hwi = identifier_global_value (hwi);
2432 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2434 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2437 hwi = DECL_ORIGINAL_TYPE (hwi);
2439 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2441 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2442 " or %<long long%>");
2446 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2447 new_asm_fprintf_length_specs = (format_length_info *)
2448 xmemdup (asm_fprintf_length_specs,
2449 sizeof (asm_fprintf_length_specs),
2450 sizeof (asm_fprintf_length_specs));
2452 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2453 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2454 if (hwi == long_integer_type_node)
2455 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2456 else if (hwi == long_long_integer_type_node)
2457 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2461 /* Assign the new data for use. */
2462 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2463 new_asm_fprintf_length_specs;
2467 /* Determine the type of a "locus" in the code being compiled for use
2468 in GCC's __gcc_gfc__ custom format attribute. You must have set
2469 dynamic_format_types before calling this function. */
2471 init_dynamic_gfc_info (void)
2477 static format_char_info *gfc_fci;
2479 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2480 must have declared 'locus' prior to using this attribute. If
2481 we haven't seen this declarations then you shouldn't use the
2482 specifier requiring that type. */
2483 if ((locus = maybe_get_identifier ("locus")))
2485 locus = identifier_global_value (locus);
2488 if (TREE_CODE (locus) != TYPE_DECL
2489 || TREE_TYPE (locus) == error_mark_node)
2491 error ("%<locus%> is not defined as a type");
2495 locus = TREE_TYPE (locus);
2499 /* Assign the new data for use. */
2501 /* Handle the __gcc_gfc__ format specifics. */
2503 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2504 gfc_fci = (format_char_info *)
2505 xmemdup (gcc_gfc_char_table,
2506 sizeof (gcc_gfc_char_table),
2507 sizeof (gcc_gfc_char_table));
2510 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2511 gfc_fci[i].types[0].type = &locus;
2512 gfc_fci[i].pointer_count = 1;
2517 /* Determine the types of "tree" and "location_t" in the code being
2518 compiled for use in GCC's diagnostic custom format attributes. You
2519 must have set dynamic_format_types before calling this function. */
2521 init_dynamic_diag_info (void)
2523 static tree t, loc, hwi;
2525 if (!loc || !t || !hwi)
2527 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2528 static format_length_info *diag_ls;
2531 /* For the GCC-diagnostics custom format specifiers to work, one
2532 must have declared 'tree' and/or 'location_t' prior to using
2533 those attributes. If we haven't seen these declarations then
2534 you shouldn't use the specifiers requiring these types.
2535 However we don't force a hard ICE because we may see only one
2536 or the other type. */
2537 if ((loc = maybe_get_identifier ("location_t")))
2539 loc = identifier_global_value (loc);
2542 if (TREE_CODE (loc) != TYPE_DECL)
2544 error ("%<location_t%> is not defined as a type");
2548 loc = TREE_TYPE (loc);
2552 /* We need to grab the underlying 'union tree_node' so peek into
2553 an extra type level. */
2554 if ((t = maybe_get_identifier ("tree")))
2556 t = identifier_global_value (t);
2559 if (TREE_CODE (t) != TYPE_DECL)
2561 error ("%<tree%> is not defined as a type");
2564 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2566 error ("%<tree%> is not defined as a pointer type");
2570 t = TREE_TYPE (TREE_TYPE (t));
2574 /* Find the underlying type for HOST_WIDE_INT. For the %w
2575 length modifier to work, one must have issued: "typedef
2576 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2577 prior to using that modifier. */
2578 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2580 hwi = identifier_global_value (hwi);
2583 if (TREE_CODE (hwi) != TYPE_DECL)
2585 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2590 hwi = DECL_ORIGINAL_TYPE (hwi);
2592 if (hwi != long_integer_type_node
2593 && hwi != long_long_integer_type_node)
2595 error ("%<__gcc_host_wide_int__%> is not defined"
2596 " as %<long%> or %<long long%>");
2603 /* Assign the new data for use. */
2605 /* All the GCC diag formats use the same length specs. */
2607 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2608 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2609 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2610 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2611 diag_ls = (format_length_info *)
2612 xmemdup (gcc_diag_length_specs,
2613 sizeof (gcc_diag_length_specs),
2614 sizeof (gcc_diag_length_specs));
2617 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2618 i = find_length_info_modifier_index (diag_ls, 'w');
2619 if (hwi == long_integer_type_node)
2620 diag_ls[i].index = FMT_LEN_l;
2621 else if (hwi == long_long_integer_type_node)
2622 diag_ls[i].index = FMT_LEN_ll;
2627 /* Handle the __gcc_diag__ format specifics. */
2629 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2630 diag_fci = (format_char_info *)
2631 xmemdup (gcc_diag_char_table,
2632 sizeof (gcc_diag_char_table),
2633 sizeof (gcc_diag_char_table));
2636 i = find_char_info_specifier_index (diag_fci, 'H');
2637 diag_fci[i].types[0].type = &loc;
2638 diag_fci[i].pointer_count = 1;
2642 i = find_char_info_specifier_index (diag_fci, 'J');
2643 diag_fci[i].types[0].type = &t;
2644 diag_fci[i].pointer_count = 1;
2645 i = find_char_info_specifier_index (diag_fci, 'K');
2646 diag_fci[i].types[0].type = &t;
2647 diag_fci[i].pointer_count = 1;
2650 /* Handle the __gcc_tdiag__ format specifics. */
2652 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2653 tdiag_fci = (format_char_info *)
2654 xmemdup (gcc_tdiag_char_table,
2655 sizeof (gcc_tdiag_char_table),
2656 sizeof (gcc_tdiag_char_table));
2659 i = find_char_info_specifier_index (tdiag_fci, 'H');
2660 tdiag_fci[i].types[0].type = &loc;
2661 tdiag_fci[i].pointer_count = 1;
2665 /* All specifiers taking a tree share the same struct. */
2666 i = find_char_info_specifier_index (tdiag_fci, 'D');
2667 tdiag_fci[i].types[0].type = &t;
2668 tdiag_fci[i].pointer_count = 1;
2669 i = find_char_info_specifier_index (tdiag_fci, 'J');
2670 tdiag_fci[i].types[0].type = &t;
2671 tdiag_fci[i].pointer_count = 1;
2672 i = find_char_info_specifier_index (tdiag_fci, 'K');
2673 tdiag_fci[i].types[0].type = &t;
2674 tdiag_fci[i].pointer_count = 1;
2677 /* Handle the __gcc_cdiag__ format specifics. */
2679 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2680 cdiag_fci = (format_char_info *)
2681 xmemdup (gcc_cdiag_char_table,
2682 sizeof (gcc_cdiag_char_table),
2683 sizeof (gcc_cdiag_char_table));
2686 i = find_char_info_specifier_index (cdiag_fci, 'H');
2687 cdiag_fci[i].types[0].type = &loc;
2688 cdiag_fci[i].pointer_count = 1;
2692 /* All specifiers taking a tree share the same struct. */
2693 i = find_char_info_specifier_index (cdiag_fci, 'D');
2694 cdiag_fci[i].types[0].type = &t;
2695 cdiag_fci[i].pointer_count = 1;
2696 i = find_char_info_specifier_index (cdiag_fci, 'J');
2697 cdiag_fci[i].types[0].type = &t;
2698 cdiag_fci[i].pointer_count = 1;
2699 i = find_char_info_specifier_index (cdiag_fci, 'K');
2700 cdiag_fci[i].types[0].type = &t;
2701 cdiag_fci[i].pointer_count = 1;
2704 /* Handle the __gcc_cxxdiag__ format specifics. */
2706 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2707 cxxdiag_fci = (format_char_info *)
2708 xmemdup (gcc_cxxdiag_char_table,
2709 sizeof (gcc_cxxdiag_char_table),
2710 sizeof (gcc_cxxdiag_char_table));
2713 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2714 cxxdiag_fci[i].types[0].type = &loc;
2715 cxxdiag_fci[i].pointer_count = 1;
2719 /* All specifiers taking a tree share the same struct. */
2720 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2721 cxxdiag_fci[i].types[0].type = &t;
2722 cxxdiag_fci[i].pointer_count = 1;
2723 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2724 cxxdiag_fci[i].types[0].type = &t;
2725 cxxdiag_fci[i].pointer_count = 1;
2726 i = find_char_info_specifier_index (cxxdiag_fci, 'K');
2727 cxxdiag_fci[i].types[0].type = &t;
2728 cxxdiag_fci[i].pointer_count = 1;
2733 #ifdef TARGET_FORMAT_TYPES
2734 extern const format_kind_info TARGET_FORMAT_TYPES[];
2737 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2738 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
2740 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2741 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
2744 /* Attributes such as "printf" are equivalent to those such as
2745 "gnu_printf" unless this is overridden by a target. */
2746 static const target_ovr_attr gnu_target_overrides_format_attributes[] =
2748 { "gnu_printf", "printf" },
2749 { "gnu_scanf", "scanf" },
2750 { "gnu_strftime", "strftime" },
2751 { "gnu_strfmon", "strfmon" },
2755 /* Translate to unified attribute name. This is used in decode_format_type and
2756 decode_format_attr. In attr_name the user specified argument is passed. It
2757 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2758 or the attr_name passed to this function, if there is no matching entry. */
2760 convert_format_name_to_system_name (const char *attr_name)
2764 if (attr_name == NULL || *attr_name == 0
2765 || strncmp (attr_name, "gcc_", 4) == 0)
2767 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2768 TARGET_OVERRIDES_FORMAT_INIT ();
2771 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2772 /* Check if format attribute is overridden by target. */
2773 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
2774 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
2776 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
2778 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
2781 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
2783 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
2787 /* Otherwise default to gnu format. */
2789 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
2792 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
2795 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
2797 return gnu_target_overrides_format_attributes[i].named_attr_src;
2803 /* Return true if TATTR_NAME and ATTR_NAME are the same format attribute,
2804 counting "name" and "__name__" as the same, false otherwise. */
2806 cmp_attribs (const char *tattr_name, const char *attr_name)
2808 int alen = strlen (attr_name);
2809 int slen = (tattr_name ? strlen (tattr_name) : 0);
2810 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_'
2811 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_')
2816 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0)
2821 /* Handle a "format" attribute; arguments as in
2822 struct attribute_spec.handler. */
2824 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2825 int flags, bool *no_add_attrs)
2828 function_format_info info;
2831 #ifdef TARGET_FORMAT_TYPES
2832 /* If the target provides additional format types, we need to
2833 add them to FORMAT_TYPES at first use. */
2834 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2836 dynamic_format_types = XNEWVEC (format_kind_info,
2837 n_format_types + TARGET_N_FORMAT_TYPES);
2838 memcpy (dynamic_format_types, format_types_orig,
2839 sizeof (format_types_orig));
2840 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2841 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2843 format_types = dynamic_format_types;
2844 n_format_types += TARGET_N_FORMAT_TYPES;
2848 if (!decode_format_attr (args, &info, 0))
2850 *no_add_attrs = true;
2854 argument = TYPE_ARG_TYPES (type);
2857 if (!check_format_string (argument, info.format_num, flags,
2861 if (info.first_arg_num != 0)
2863 unsigned HOST_WIDE_INT arg_num = 1;
2865 /* Verify that first_arg_num points to the last arg,
2868 arg_num++, argument = TREE_CHAIN (argument);
2870 if (arg_num != info.first_arg_num)
2872 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2873 error ("args to be formatted is not %<...%>");
2874 *no_add_attrs = true;
2880 /* Check if this is a strftime variant. Just for this variant
2881 FMT_FLAG_ARG_CONVERT is not set. */
2882 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
2883 && info.first_arg_num != 0)
2885 error ("strftime formats cannot format arguments");
2886 *no_add_attrs = true;
2890 /* If this is a custom GCC-internal format type, we have to
2891 initialize certain bits a runtime. */
2892 if (info.format_type == asm_fprintf_format_type
2893 || info.format_type == gcc_gfc_format_type
2894 || info.format_type == gcc_diag_format_type
2895 || info.format_type == gcc_tdiag_format_type
2896 || info.format_type == gcc_cdiag_format_type
2897 || info.format_type == gcc_cxxdiag_format_type)
2899 /* Our first time through, we have to make sure that our
2900 format_type data is allocated dynamically and is modifiable. */
2901 if (!dynamic_format_types)
2902 format_types = dynamic_format_types = (format_kind_info *)
2903 xmemdup (format_types_orig, sizeof (format_types_orig),
2904 sizeof (format_types_orig));
2906 /* If this is format __asm_fprintf__, we have to initialize
2907 GCC's notion of HOST_WIDE_INT for checking %wd. */
2908 if (info.format_type == asm_fprintf_format_type)
2909 init_dynamic_asm_fprintf_info ();
2910 /* If this is format __gcc_gfc__, we have to initialize GCC's
2911 notion of 'locus' at runtime for %L. */
2912 else if (info.format_type == gcc_gfc_format_type)
2913 init_dynamic_gfc_info ();
2914 /* If this is one of the diagnostic attributes, then we have to
2915 initialize 'location_t' and 'tree' at runtime. */
2916 else if (info.format_type == gcc_diag_format_type
2917 || info.format_type == gcc_tdiag_format_type
2918 || info.format_type == gcc_cdiag_format_type
2919 || info.format_type == gcc_cxxdiag_format_type)
2920 init_dynamic_diag_info ();