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 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"
34 /* Set format warning options according to a -Wformat=n option. */
37 set_Wformat (int setting)
39 warn_format = setting;
40 warn_format_extra_args = setting;
41 warn_format_zero_length = setting;
42 warn_format_contains_nul = 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 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 },
295 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
296 { NULL, 0, 0, NULL, 0, 0 }
299 /* Length specifiers valid for asm_fprintf. */
300 static const format_length_info asm_fprintf_length_specs[] =
302 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
303 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
304 { NULL, 0, 0, NULL, 0, 0 }
307 /* Length specifiers valid for GCC diagnostics. */
308 static const format_length_info gcc_diag_length_specs[] =
310 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
311 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
312 { NULL, 0, 0, NULL, 0, 0 }
315 /* The custom diagnostics all accept the same length specifiers. */
316 #define gcc_tdiag_length_specs gcc_diag_length_specs
317 #define gcc_cdiag_length_specs gcc_diag_length_specs
318 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
320 /* This differs from printf_length_specs only in that "Z" is not accepted. */
321 static const format_length_info scanf_length_specs[] =
323 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
324 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
325 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
326 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
327 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
328 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
329 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
330 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 },
331 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
332 { NULL, 0, 0, NULL, 0, 0 }
336 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
337 make no sense for a format type not part of any C standard version. */
338 static const format_length_info strfmon_length_specs[] =
340 /* A GNU extension. */
341 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
342 { NULL, 0, 0, NULL, 0, 0 }
346 /* For now, the Fortran front-end routines only use l as length modifier. */
347 static const format_length_info gcc_gfc_length_specs[] =
349 { "l", FMT_LEN_l, STD_C89, NULL, 0, 0 },
350 { NULL, 0, 0, NULL, 0, 0 }
354 static const format_flag_spec printf_flag_specs[] =
356 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
357 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
358 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
359 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
360 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
361 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
362 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
363 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
364 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
365 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
366 { 0, 0, 0, NULL, NULL, 0 }
370 static const format_flag_pair printf_flag_pairs[] =
374 { '0', 'p', 1, 'i' },
378 static const format_flag_spec asm_fprintf_flag_specs[] =
380 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
381 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
382 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
383 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
384 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
385 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
386 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
387 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
388 { 0, 0, 0, NULL, NULL, 0 }
391 static const format_flag_pair asm_fprintf_flag_pairs[] =
395 { '0', 'p', 1, 'i' },
399 static const format_flag_pair gcc_diag_flag_pairs[] =
404 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
405 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
406 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
408 static const format_flag_pair gcc_gfc_flag_pairs[] =
413 static const format_flag_spec gcc_diag_flag_specs[] =
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 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
423 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
425 static const format_flag_spec gcc_cxxdiag_flag_specs[] =
427 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
428 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
429 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
430 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
431 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
432 { 0, 0, 0, NULL, NULL, 0 }
435 static const format_flag_spec scanf_flag_specs[] =
437 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
438 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
439 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
440 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
441 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
442 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
443 { 0, 0, 0, NULL, NULL, 0 }
447 static const format_flag_pair scanf_flag_pairs[] =
454 static const format_flag_spec strftime_flag_specs[] =
456 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
457 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
458 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
459 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
460 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
461 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
462 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
463 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
464 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
465 { 0, 0, 0, NULL, NULL, 0 }
469 static const format_flag_pair strftime_flag_pairs[] =
480 static const format_flag_spec strfmon_flag_specs[] =
482 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
483 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
484 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
485 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
486 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
487 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
488 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
489 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
490 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
491 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
492 { 0, 0, 0, NULL, NULL, 0 }
495 static const format_flag_pair strfmon_flag_pairs[] =
502 static const format_char_info print_char_table[] =
504 /* C89 conversion specifiers. */
505 { "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 },
506 { "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 },
507 { "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 },
508 { "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 },
509 { "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 },
510 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
511 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
512 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
513 { "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 },
514 /* C99 conversion specifiers. */
515 { "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 },
516 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
517 /* X/Open conversion specifiers. */
518 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
519 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
520 /* GNU conversion specifiers. */
521 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
522 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
525 static const format_char_info asm_fprintf_char_table[] =
527 /* C89 conversion specifiers. */
528 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
529 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
530 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
531 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
532 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
534 /* asm_fprintf conversion specifiers. */
535 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
536 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
537 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
538 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
539 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
540 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
541 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
542 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
545 static const format_char_info gcc_diag_char_table[] =
547 /* C89 conversion specifiers. */
548 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
549 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
550 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
551 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
552 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
553 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
555 /* Custom conversion specifiers. */
557 /* %H will require "location_t" at runtime. */
558 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
560 /* These will require a "tree" at runtime. */
561 { "J", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
563 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
564 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
565 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
568 static const format_char_info gcc_tdiag_char_table[] =
570 /* C89 conversion specifiers. */
571 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
572 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
573 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
574 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
575 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
576 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
578 /* Custom conversion specifiers. */
580 /* %H will require "location_t" at runtime. */
581 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
583 /* These will require a "tree" at runtime. */
584 { "DFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
586 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
587 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
588 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
591 static const format_char_info gcc_cdiag_char_table[] =
593 /* C89 conversion specifiers. */
594 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
595 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
596 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
597 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
598 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
599 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
601 /* Custom conversion specifiers. */
603 /* %H will require "location_t" at runtime. */
604 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
606 /* These will require a "tree" at runtime. */
607 { "DEFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
609 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
610 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
611 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
614 static const format_char_info gcc_cxxdiag_char_table[] =
616 /* C89 conversion specifiers. */
617 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
618 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
619 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
620 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
621 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
622 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
624 /* Custom conversion specifiers. */
626 /* %H will require "location_t" at runtime. */
627 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
629 /* These will require a "tree" at runtime. */
630 { "ADEFJTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
632 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
633 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
635 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
636 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
637 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
640 static const format_char_info gcc_gfc_char_table[] =
642 /* C89 conversion specifiers. */
643 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
644 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
645 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
646 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
648 /* gfc conversion specifiers. */
650 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
652 /* This will require a "locus" at runtime. */
653 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
655 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
658 static const format_char_info scan_char_table[] =
660 /* C89 conversion specifiers. */
661 { "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 },
662 { "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 },
663 { "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 },
664 { "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 },
665 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW", NULL },
666 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW", NULL },
667 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[", NULL },
668 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
669 { "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 },
670 /* C99 conversion specifiers. */
671 { "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 },
672 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
673 /* X/Open conversion specifiers. */
674 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
675 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W", NULL },
676 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
679 static const format_char_info time_char_table[] =
681 /* C89 conversion specifiers. */
682 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
683 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
684 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
685 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
686 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
687 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
688 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
689 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
690 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
691 /* C99 conversion specifiers. */
692 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
693 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
694 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
695 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
696 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
697 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
698 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
699 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
700 /* GNU conversion specifiers. */
701 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
702 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
703 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
706 static const format_char_info monetary_char_table[] =
708 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
709 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
712 /* This must be in the same order as enum format_type. */
713 static const format_kind_info format_types_orig[] =
715 { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
716 printf_flag_specs, printf_flag_pairs,
717 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
719 &integer_type_node, &integer_type_node
721 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
722 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
723 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
727 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
728 gcc_diag_flag_specs, gcc_diag_flag_pairs,
729 FMT_FLAG_ARG_CONVERT,
731 NULL, &integer_type_node
733 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
734 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
735 FMT_FLAG_ARG_CONVERT,
737 NULL, &integer_type_node
739 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
740 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
741 FMT_FLAG_ARG_CONVERT,
743 NULL, &integer_type_node
745 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
746 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
747 FMT_FLAG_ARG_CONVERT,
749 NULL, &integer_type_node
751 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL,
752 NULL, gcc_gfc_flag_pairs,
753 FMT_FLAG_ARG_CONVERT,
757 { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
758 scanf_flag_specs, scanf_flag_pairs,
759 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
763 { "strftime", NULL, time_char_table, "_-0^#", "EO",
764 strftime_flag_specs, strftime_flag_pairs,
765 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0,
768 { "strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
769 strfmon_flag_specs, strfmon_flag_pairs,
770 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L',
775 /* This layer of indirection allows GCC to reassign format_types with
776 new data if necessary, while still allowing the original data to be
778 static const format_kind_info *format_types = format_types_orig;
779 /* We can modify this one. We also add target-specific format types
780 to the end of the array. */
781 static format_kind_info *dynamic_format_types;
783 static int n_format_types = ARRAY_SIZE (format_types_orig);
785 /* Structure detailing the results of checking a format function call
786 where the format expression may be a conditional expression with
787 many leaves resulting from nested conditional expressions. */
790 /* Number of leaves of the format argument that could not be checked
791 as they were not string literals. */
792 int number_non_literal;
793 /* Number of leaves of the format argument that were null pointers or
794 string literals, but had extra format arguments. */
795 int number_extra_args;
796 /* Number of leaves of the format argument that were null pointers or
797 string literals, but had extra format arguments and used $ operand
799 int number_dollar_extra_args;
800 /* Number of leaves of the format argument that were wide string
803 /* Number of leaves of the format argument that were empty strings. */
805 /* Number of leaves of the format argument that were unterminated
807 int number_unterminated;
808 /* Number of leaves of the format argument that were not counted above. */
810 } format_check_results;
814 format_check_results *res;
815 function_format_info *info;
817 } format_check_context;
819 static void check_format_info (function_format_info *, tree);
820 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
821 static void check_format_info_main (format_check_results *,
822 function_format_info *,
823 const char *, int, tree,
824 unsigned HOST_WIDE_INT);
826 static void init_dollar_format_checking (int, tree);
827 static int maybe_read_dollar_number (const char **, int,
828 tree, tree *, const format_kind_info *);
829 static bool avoid_dollar_number (const char *);
830 static void finish_dollar_format_checking (format_check_results *, int);
832 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
835 static void check_format_types (format_wanted_type *, const char *, int);
836 static void format_type_warning (const char *, const char *, int, tree,
837 int, const char *, tree, int);
839 /* Decode a format type from a string, returning the type, or
840 format_type_error if not valid, in which case the caller should print an
843 decode_format_type (const char *s)
848 for (i = 0; i < n_format_types; i++)
851 if (!strcmp (s, format_types[i].name))
853 alen = strlen (format_types[i].name);
854 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
855 && s[slen - 1] == '_' && s[slen - 2] == '_'
856 && !strncmp (s + 2, format_types[i].name, alen))
859 return format_type_error;
863 /* Check the argument list of a call to printf, scanf, etc.
864 ATTRS are the attributes on the function type. There are NARGS argument
865 values in the array ARGARRAY.
866 Also, if -Wmissing-format-attribute,
867 warn for calls to vprintf or vscanf in functions with no such format
868 attribute themselves. */
871 check_function_format (tree attrs, int nargs, tree *argarray)
875 /* See if this function has any format attributes. */
876 for (a = attrs; a; a = TREE_CHAIN (a))
878 if (is_attribute_p ("format", TREE_PURPOSE (a)))
881 function_format_info info;
882 decode_format_attr (TREE_VALUE (a), &info, 1);
885 /* FIXME: Rewrite all the internal functions in this file
886 to use the ARGARRAY directly instead of constructing this
888 tree params = NULL_TREE;
890 for (i = nargs - 1; i >= 0; i--)
891 params = tree_cons (NULL_TREE, argarray[i], params);
892 check_format_info (&info, params);
894 if (warn_missing_format_attribute && info.first_arg_num == 0
895 && (format_types[info.format_type].flags
896 & (int) FMT_FLAG_ARG_CONVERT))
899 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
902 if (is_attribute_p ("format", TREE_PURPOSE (c))
903 && (decode_format_type (IDENTIFIER_POINTER
904 (TREE_VALUE (TREE_VALUE (c))))
905 == info.format_type))
909 /* Check if the current function has a parameter to which
910 the format attribute could be attached; if not, it
911 can't be a candidate for a format attribute, despite
912 the vprintf-like or vscanf-like call. */
914 for (args = DECL_ARGUMENTS (current_function_decl);
916 args = TREE_CHAIN (args))
918 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
919 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
924 warning (OPT_Wmissing_format_attribute, "function might "
925 "be possible candidate for %qs format attribute",
926 format_types[info.format_type].name);
934 /* Variables used by the checking of $ operand number formats. */
935 static char *dollar_arguments_used = NULL;
936 static char *dollar_arguments_pointer_p = NULL;
937 static int dollar_arguments_alloc = 0;
938 static int dollar_arguments_count;
939 static int dollar_first_arg_num;
940 static int dollar_max_arg_used;
941 static int dollar_format_warned;
943 /* Initialize the checking for a format string that may contain $
944 parameter number specifications; we will need to keep track of whether
945 each parameter has been used. FIRST_ARG_NUM is the number of the first
946 argument that is a parameter to the format, or 0 for a vprintf-style
947 function; PARAMS is the list of arguments starting at this argument. */
950 init_dollar_format_checking (int first_arg_num, tree params)
952 tree oparams = params;
954 dollar_first_arg_num = first_arg_num;
955 dollar_arguments_count = 0;
956 dollar_max_arg_used = 0;
957 dollar_format_warned = 0;
958 if (first_arg_num > 0)
962 dollar_arguments_count++;
963 params = TREE_CHAIN (params);
966 if (dollar_arguments_alloc < dollar_arguments_count)
968 if (dollar_arguments_used)
969 free (dollar_arguments_used);
970 if (dollar_arguments_pointer_p)
971 free (dollar_arguments_pointer_p);
972 dollar_arguments_alloc = dollar_arguments_count;
973 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
974 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
976 if (dollar_arguments_alloc)
978 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
979 if (first_arg_num > 0)
985 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
987 params = TREE_CHAIN (params);
995 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
996 is set, it is an error if one is not found; otherwise, it is OK. If
997 such a number is found, check whether it is within range and mark that
998 numbered operand as being used for later checking. Returns the operand
999 number if found and within range, zero if no such number was found and
1000 this is OK, or -1 on error. PARAMS points to the first operand of the
1001 format; PARAM_PTR is made to point to the parameter referred to. If
1002 a $ format is found, *FORMAT is updated to point just after it. */
1005 maybe_read_dollar_number (const char **format,
1006 int dollar_needed, tree params, tree *param_ptr,
1007 const format_kind_info *fki)
1011 const char *fcp = *format;
1012 if (!ISDIGIT (*fcp))
1016 warning (OPT_Wformat, "missing $ operand number in format");
1024 while (ISDIGIT (*fcp))
1027 nargnum = 10 * argnum + (*fcp - '0');
1028 if (nargnum < 0 || nargnum / 10 != argnum)
1037 warning (OPT_Wformat, "missing $ operand number in format");
1044 if (pedantic && !dollar_format_warned)
1046 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1047 C_STD_NAME (STD_EXT));
1048 dollar_format_warned = 1;
1050 if (overflow_flag || argnum == 0
1051 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1053 warning (OPT_Wformat, "operand number out of range in format");
1056 if (argnum > dollar_max_arg_used)
1057 dollar_max_arg_used = argnum;
1058 /* For vprintf-style functions we may need to allocate more memory to
1059 track which arguments are used. */
1060 while (dollar_arguments_alloc < dollar_max_arg_used)
1063 nalloc = 2 * dollar_arguments_alloc + 16;
1064 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1066 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1068 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1069 nalloc - dollar_arguments_alloc);
1070 dollar_arguments_alloc = nalloc;
1072 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1073 && dollar_arguments_used[argnum - 1] == 1)
1075 dollar_arguments_used[argnum - 1] = 2;
1076 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1080 dollar_arguments_used[argnum - 1] = 1;
1081 if (dollar_first_arg_num)
1084 *param_ptr = params;
1085 for (i = 1; i < argnum && *param_ptr != 0; i++)
1086 *param_ptr = TREE_CHAIN (*param_ptr);
1088 /* This case shouldn't be caught here. */
1089 gcc_assert (*param_ptr);
1096 /* Ensure that FORMAT does not start with a decimal number followed by
1097 a $; give a diagnostic and return true if it does, false otherwise. */
1100 avoid_dollar_number (const char *format)
1102 if (!ISDIGIT (*format))
1104 while (ISDIGIT (*format))
1108 warning (OPT_Wformat, "$ operand number used after format without operand number");
1115 /* Finish the checking for a format string that used $ operand number formats
1116 instead of non-$ formats. We check for unused operands before used ones
1117 (a serious error, since the implementation of the format function
1118 can't know what types to pass to va_arg to find the later arguments).
1119 and for unused operands at the end of the format (if we know how many
1120 arguments the format had, so not for vprintf). If there were operand
1121 numbers out of range on a non-vprintf-style format, we won't have reached
1122 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1126 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1129 bool found_pointer_gap = false;
1130 for (i = 0; i < dollar_max_arg_used; i++)
1132 if (!dollar_arguments_used[i])
1134 if (pointer_gap_ok && (dollar_first_arg_num == 0
1135 || dollar_arguments_pointer_p[i]))
1136 found_pointer_gap = true;
1138 warning (OPT_Wformat,
1139 "format argument %d unused before used argument %d in $-style format",
1140 i + 1, dollar_max_arg_used);
1143 if (found_pointer_gap
1144 || (dollar_first_arg_num
1145 && dollar_max_arg_used < dollar_arguments_count))
1147 res->number_other--;
1148 res->number_dollar_extra_args++;
1153 /* Retrieve the specification for a format flag. SPEC contains the
1154 specifications for format flags for the applicable kind of format.
1155 FLAG is the flag in question. If PREDICATES is NULL, the basic
1156 spec for that flag must be retrieved and must exist. If
1157 PREDICATES is not NULL, it is a string listing possible predicates
1158 for the spec entry; if an entry predicated on any of these is
1159 found, it is returned, otherwise NULL is returned. */
1161 static const format_flag_spec *
1162 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1165 for (i = 0; spec[i].flag_char != 0; i++)
1167 if (spec[i].flag_char != flag)
1169 if (predicates != NULL)
1171 if (spec[i].predicate != 0
1172 && strchr (predicates, spec[i].predicate) != 0)
1175 else if (spec[i].predicate == 0)
1178 gcc_assert (predicates);
1183 /* Check the argument list of a call to printf, scanf, etc.
1184 INFO points to the function_format_info structure.
1185 PARAMS is the list of argument values. */
1188 check_format_info (function_format_info *info, tree params)
1190 format_check_context format_ctx;
1191 unsigned HOST_WIDE_INT arg_num;
1193 format_check_results res;
1194 /* Skip to format argument. If the argument isn't available, there's
1195 no work for us to do; prototype checking will catch the problem. */
1196 for (arg_num = 1; ; ++arg_num)
1200 if (arg_num == info->format_num)
1202 params = TREE_CHAIN (params);
1204 format_tree = TREE_VALUE (params);
1205 params = TREE_CHAIN (params);
1206 if (format_tree == 0)
1209 res.number_non_literal = 0;
1210 res.number_extra_args = 0;
1211 res.number_dollar_extra_args = 0;
1212 res.number_wide = 0;
1213 res.number_empty = 0;
1214 res.number_unterminated = 0;
1215 res.number_other = 0;
1217 format_ctx.res = &res;
1218 format_ctx.info = info;
1219 format_ctx.params = params;
1221 check_function_arguments_recurse (check_format_arg, &format_ctx,
1222 format_tree, arg_num);
1224 if (res.number_non_literal > 0)
1226 /* Functions taking a va_list normally pass a non-literal format
1227 string. These functions typically are declared with
1228 first_arg_num == 0, so avoid warning in those cases. */
1229 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1231 /* For strftime-like formats, warn for not checking the format
1232 string; but there are no arguments to check. */
1233 warning (OPT_Wformat_nonliteral,
1234 "format not a string literal, format string not checked");
1236 else if (info->first_arg_num != 0)
1238 /* If there are no arguments for the format at all, we may have
1239 printf (foo) which is likely to be a security hole. */
1240 while (arg_num + 1 < info->first_arg_num)
1244 params = TREE_CHAIN (params);
1247 if (params == 0 && warn_format_security)
1248 warning (OPT_Wformat_security,
1249 "format not a string literal and no format arguments");
1250 else if (params == 0 && warn_format_nonliteral)
1251 warning (OPT_Wformat_nonliteral,
1252 "format not a string literal and no format arguments");
1254 warning (OPT_Wformat_nonliteral,
1255 "format not a string literal, argument types not checked");
1259 /* If there were extra arguments to the format, normally warn. However,
1260 the standard does say extra arguments are ignored, so in the specific
1261 case where we have multiple leaves (conditional expressions or
1262 ngettext) allow extra arguments if at least one leaf didn't have extra
1263 arguments, but was otherwise OK (either non-literal or checked OK).
1264 If the format is an empty string, this should be counted similarly to the
1265 case of extra format arguments. */
1266 if (res.number_extra_args > 0 && res.number_non_literal == 0
1267 && res.number_other == 0)
1268 warning (OPT_Wformat_extra_args, "too many arguments for format");
1269 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1270 && res.number_other == 0)
1271 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1272 if (res.number_empty > 0 && res.number_non_literal == 0
1273 && res.number_other == 0)
1274 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1275 format_types[info->format_type].name);
1277 if (res.number_wide > 0)
1278 warning (OPT_Wformat, "format is a wide character string");
1280 if (res.number_unterminated > 0)
1281 warning (OPT_Wformat, "unterminated format string");
1284 /* Callback from check_function_arguments_recurse to check a
1285 format string. FORMAT_TREE is the format parameter. ARG_NUM
1286 is the number of the format argument. CTX points to a
1287 format_check_context. */
1290 check_format_arg (void *ctx, tree format_tree,
1291 unsigned HOST_WIDE_INT arg_num)
1293 format_check_context *format_ctx = (format_check_context *) ctx;
1294 format_check_results *res = format_ctx->res;
1295 function_format_info *info = format_ctx->info;
1296 tree params = format_ctx->params;
1299 HOST_WIDE_INT offset;
1300 const char *format_chars;
1301 tree array_size = 0;
1304 if (integer_zerop (format_tree))
1306 /* Skip to first argument to check, so we can see if this format
1307 has any arguments (it shouldn't). */
1308 while (arg_num + 1 < info->first_arg_num)
1312 params = TREE_CHAIN (params);
1317 res->number_other++;
1319 res->number_extra_args++;
1325 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1329 arg0 = TREE_OPERAND (format_tree, 0);
1330 arg1 = TREE_OPERAND (format_tree, 1);
1333 if (TREE_CODE (arg1) == INTEGER_CST)
1337 res->number_non_literal++;
1340 if (!host_integerp (arg1, 0)
1341 || (offset = tree_low_cst (arg1, 0)) < 0)
1343 res->number_non_literal++;
1347 if (TREE_CODE (format_tree) != ADDR_EXPR)
1349 res->number_non_literal++;
1352 format_tree = TREE_OPERAND (format_tree, 0);
1353 if (TREE_CODE (format_tree) == ARRAY_REF
1354 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1355 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1356 format_tree = TREE_OPERAND (format_tree, 0);
1357 if (TREE_CODE (format_tree) == VAR_DECL
1358 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1359 && (array_init = decl_constant_value (format_tree)) != format_tree
1360 && TREE_CODE (array_init) == STRING_CST)
1362 /* Extract the string constant initializer. Note that this may include
1363 a trailing NUL character that is not in the array (e.g.
1364 const char a[3] = "foo";). */
1365 array_size = DECL_SIZE_UNIT (format_tree);
1366 format_tree = array_init;
1368 if (TREE_CODE (format_tree) != STRING_CST)
1370 res->number_non_literal++;
1373 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1378 format_chars = TREE_STRING_POINTER (format_tree);
1379 format_length = TREE_STRING_LENGTH (format_tree);
1380 if (array_size != 0)
1382 /* Variable length arrays can't be initialized. */
1383 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1385 if (host_integerp (array_size, 0))
1387 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1388 if (array_size_value > 0
1389 && array_size_value == (int) array_size_value
1390 && format_length > array_size_value)
1391 format_length = array_size_value;
1396 if (offset >= format_length)
1398 res->number_non_literal++;
1401 format_chars += offset;
1402 format_length -= offset;
1404 if (format_length < 1 || format_chars[--format_length] != 0)
1406 res->number_unterminated++;
1409 if (format_length == 0)
1411 res->number_empty++;
1415 /* Skip to first argument to check. */
1416 while (arg_num + 1 < info->first_arg_num)
1420 params = TREE_CHAIN (params);
1423 /* Provisionally increment res->number_other; check_format_info_main
1424 will decrement it if it finds there are extra arguments, but this way
1425 need not adjust it for every return. */
1426 res->number_other++;
1427 check_format_info_main (res, info, format_chars, format_length,
1432 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1433 is the NUL-terminated format string (which at this point may contain
1434 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1435 terminating NUL character). ARG_NUM is one less than the number of
1436 the first format argument to check; PARAMS points to that format
1437 argument in the list of arguments. */
1440 check_format_info_main (format_check_results *res,
1441 function_format_info *info, const char *format_chars,
1442 int format_length, tree params,
1443 unsigned HOST_WIDE_INT arg_num)
1445 const char *orig_format_chars = format_chars;
1446 tree first_fillin_param = params;
1448 const format_kind_info *fki = &format_types[info->format_type];
1449 const format_flag_spec *flag_specs = fki->flag_specs;
1450 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1452 /* -1 if no conversions taking an operand have been found; 0 if one has
1453 and it didn't use $; 1 if $ formats are in use. */
1454 int has_operand_number = -1;
1456 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1461 int suppressed = FALSE;
1462 const char *length_chars = NULL;
1463 enum format_lengths length_chars_val = FMT_LEN_none;
1464 enum format_std_version length_chars_std = STD_C89;
1468 int main_arg_num = 0;
1469 tree main_arg_params = 0;
1470 enum format_std_version wanted_type_std;
1471 const char *wanted_type_name;
1472 format_wanted_type width_wanted_type;
1473 format_wanted_type precision_wanted_type;
1474 format_wanted_type main_wanted_type;
1475 format_wanted_type *first_wanted_type = NULL;
1476 format_wanted_type *last_wanted_type = NULL;
1477 const format_length_info *fli = NULL;
1478 const format_char_info *fci = NULL;
1479 char flag_chars[256];
1481 const char *format_start = format_chars;
1482 if (*format_chars == 0)
1484 if (format_chars - orig_format_chars != format_length)
1485 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
1486 if (info->first_arg_num != 0 && params != 0
1487 && has_operand_number <= 0)
1489 res->number_other--;
1490 res->number_extra_args++;
1492 if (has_operand_number > 0)
1493 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1496 if (*format_chars++ != '%')
1498 if (*format_chars == 0)
1500 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1503 if (*format_chars == '%')
1510 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1512 /* Possibly read a $ operand number at the start of the format.
1513 If one was previously used, one is required here. If one
1514 is not used here, we can't immediately conclude this is a
1515 format without them, since it could be printf %m or scanf %*. */
1517 opnum = maybe_read_dollar_number (&format_chars, 0,
1519 &main_arg_params, fki);
1524 has_operand_number = 1;
1525 main_arg_num = opnum + info->first_arg_num - 1;
1528 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1530 if (avoid_dollar_number (format_chars))
1534 /* Read any format flags, but do not yet validate them beyond removing
1535 duplicates, since in general validation depends on the rest of
1537 while (*format_chars != 0
1538 && strchr (fki->flag_chars, *format_chars) != 0)
1540 const format_flag_spec *s = get_flag_spec (flag_specs,
1541 *format_chars, NULL);
1542 if (strchr (flag_chars, *format_chars) != 0)
1544 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1548 i = strlen (flag_chars);
1549 flag_chars[i++] = *format_chars;
1552 if (s->skip_next_char)
1555 if (*format_chars == 0)
1557 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1564 /* Read any format width, possibly * or *m$. */
1565 if (fki->width_char != 0)
1567 if (fki->width_type != NULL && *format_chars == '*')
1569 i = strlen (flag_chars);
1570 flag_chars[i++] = fki->width_char;
1572 /* "...a field width...may be indicated by an asterisk.
1573 In this case, an int argument supplies the field width..." */
1575 if (has_operand_number != 0)
1578 opnum = maybe_read_dollar_number (&format_chars,
1579 has_operand_number == 1,
1586 has_operand_number = 1;
1587 arg_num = opnum + info->first_arg_num - 1;
1590 has_operand_number = 0;
1594 if (avoid_dollar_number (format_chars))
1597 if (info->first_arg_num != 0)
1601 warning (OPT_Wformat, "too few arguments for format");
1604 cur_param = TREE_VALUE (params);
1605 if (has_operand_number <= 0)
1607 params = TREE_CHAIN (params);
1610 width_wanted_type.wanted_type = *fki->width_type;
1611 width_wanted_type.wanted_type_name = NULL;
1612 width_wanted_type.pointer_count = 0;
1613 width_wanted_type.char_lenient_flag = 0;
1614 width_wanted_type.writing_in_flag = 0;
1615 width_wanted_type.reading_from_flag = 0;
1616 width_wanted_type.name = _("field width");
1617 width_wanted_type.param = cur_param;
1618 width_wanted_type.arg_num = arg_num;
1619 width_wanted_type.next = NULL;
1620 if (last_wanted_type != 0)
1621 last_wanted_type->next = &width_wanted_type;
1622 if (first_wanted_type == 0)
1623 first_wanted_type = &width_wanted_type;
1624 last_wanted_type = &width_wanted_type;
1629 /* Possibly read a numeric width. If the width is zero,
1630 we complain if appropriate. */
1631 int non_zero_width_char = FALSE;
1632 int found_width = FALSE;
1633 while (ISDIGIT (*format_chars))
1636 if (*format_chars != '0')
1637 non_zero_width_char = TRUE;
1640 if (found_width && !non_zero_width_char &&
1641 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1642 warning (OPT_Wformat, "zero width in %s format", fki->name);
1645 i = strlen (flag_chars);
1646 flag_chars[i++] = fki->width_char;
1652 /* Read any format left precision (must be a number, not *). */
1653 if (fki->left_precision_char != 0 && *format_chars == '#')
1656 i = strlen (flag_chars);
1657 flag_chars[i++] = fki->left_precision_char;
1659 if (!ISDIGIT (*format_chars))
1660 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1661 while (ISDIGIT (*format_chars))
1665 /* Read any format precision, possibly * or *m$. */
1666 if (fki->precision_char != 0 && *format_chars == '.')
1669 i = strlen (flag_chars);
1670 flag_chars[i++] = fki->precision_char;
1672 if (fki->precision_type != NULL && *format_chars == '*')
1674 /* "...a...precision...may be indicated by an asterisk.
1675 In this case, an int argument supplies the...precision." */
1677 if (has_operand_number != 0)
1680 opnum = maybe_read_dollar_number (&format_chars,
1681 has_operand_number == 1,
1688 has_operand_number = 1;
1689 arg_num = opnum + info->first_arg_num - 1;
1692 has_operand_number = 0;
1696 if (avoid_dollar_number (format_chars))
1699 if (info->first_arg_num != 0)
1703 warning (OPT_Wformat, "too few arguments for format");
1706 cur_param = TREE_VALUE (params);
1707 if (has_operand_number <= 0)
1709 params = TREE_CHAIN (params);
1712 precision_wanted_type.wanted_type = *fki->precision_type;
1713 precision_wanted_type.wanted_type_name = NULL;
1714 precision_wanted_type.pointer_count = 0;
1715 precision_wanted_type.char_lenient_flag = 0;
1716 precision_wanted_type.writing_in_flag = 0;
1717 precision_wanted_type.reading_from_flag = 0;
1718 precision_wanted_type.name = _("field precision");
1719 precision_wanted_type.param = cur_param;
1720 precision_wanted_type.arg_num = arg_num;
1721 precision_wanted_type.next = NULL;
1722 if (last_wanted_type != 0)
1723 last_wanted_type->next = &precision_wanted_type;
1724 if (first_wanted_type == 0)
1725 first_wanted_type = &precision_wanted_type;
1726 last_wanted_type = &precision_wanted_type;
1731 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1732 && !ISDIGIT (*format_chars))
1733 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1734 while (ISDIGIT (*format_chars))
1739 /* Read any length modifier, if this kind of format has them. */
1740 fli = fki->length_char_specs;
1741 length_chars = NULL;
1742 length_chars_val = FMT_LEN_none;
1743 length_chars_std = STD_C89;
1746 while (fli->name != 0 && fli->name[0] != *format_chars)
1751 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1754 length_chars = fli->double_name;
1755 length_chars_val = fli->double_index;
1756 length_chars_std = fli->double_std;
1760 length_chars = fli->name;
1761 length_chars_val = fli->index;
1762 length_chars_std = fli->std;
1764 i = strlen (flag_chars);
1765 flag_chars[i++] = fki->length_code_char;
1770 /* Warn if the length modifier is non-standard. */
1771 if (ADJ_STD (length_chars_std) > C_STD_VER)
1772 warning (OPT_Wformat,
1773 "%s does not support the %qs %s length modifier",
1774 C_STD_NAME (length_chars_std), length_chars,
1779 /* Read any modifier (strftime E/O). */
1780 if (fki->modifier_chars != NULL)
1782 while (*format_chars != 0
1783 && strchr (fki->modifier_chars, *format_chars) != 0)
1785 if (strchr (flag_chars, *format_chars) != 0)
1787 const format_flag_spec *s = get_flag_spec (flag_specs,
1788 *format_chars, NULL);
1789 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1793 i = strlen (flag_chars);
1794 flag_chars[i++] = *format_chars;
1801 /* Handle the scanf allocation kludge. */
1802 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1804 if (*format_chars == 'a' && !flag_isoc99)
1806 if (format_chars[1] == 's' || format_chars[1] == 'S'
1807 || format_chars[1] == '[')
1809 /* 'a' is used as a flag. */
1810 i = strlen (flag_chars);
1811 flag_chars[i++] = 'a';
1818 format_char = *format_chars;
1819 if (format_char == 0
1820 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1821 && format_char == '%'))
1823 warning (OPT_Wformat, "conversion lacks type at end of format");
1827 fci = fki->conversion_specs;
1828 while (fci->format_chars != 0
1829 && strchr (fci->format_chars, format_char) == 0)
1831 if (fci->format_chars == 0)
1833 if (ISGRAPH (format_char))
1834 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1837 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1843 if (ADJ_STD (fci->std) > C_STD_VER)
1844 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1845 C_STD_NAME (fci->std), format_char, fki->name);
1848 /* Validate the individual flags used, removing any that are invalid. */
1851 for (i = 0; flag_chars[i] != 0; i++)
1853 const format_flag_spec *s = get_flag_spec (flag_specs,
1854 flag_chars[i], NULL);
1855 flag_chars[i - d] = flag_chars[i];
1856 if (flag_chars[i] == fki->length_code_char)
1858 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1860 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1861 _(s->name), format_char, fki->name);
1867 const format_flag_spec *t;
1868 if (ADJ_STD (s->std) > C_STD_VER)
1869 warning (OPT_Wformat, "%s does not support %s",
1870 C_STD_NAME (s->std), _(s->long_name));
1871 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1872 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1874 const char *long_name = (t->long_name != NULL
1877 if (ADJ_STD (t->std) > C_STD_VER)
1878 warning (OPT_Wformat,
1879 "%s does not support %s with the %<%%%c%> %s format",
1880 C_STD_NAME (t->std), _(long_name),
1881 format_char, fki->name);
1885 flag_chars[i - d] = 0;
1888 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1889 && strchr (flag_chars, 'a') != 0)
1892 if (fki->suppression_char
1893 && strchr (flag_chars, fki->suppression_char) != 0)
1896 /* Validate the pairs of flags used. */
1897 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1899 const format_flag_spec *s, *t;
1900 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1902 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1904 if (bad_flag_pairs[i].predicate != 0
1905 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1907 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1908 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1909 if (bad_flag_pairs[i].ignored)
1911 if (bad_flag_pairs[i].predicate != 0)
1912 warning (OPT_Wformat,
1913 "%s ignored with %s and %<%%%c%> %s format",
1914 _(s->name), _(t->name), format_char,
1917 warning (OPT_Wformat, "%s ignored with %s in %s format",
1918 _(s->name), _(t->name), fki->name);
1922 if (bad_flag_pairs[i].predicate != 0)
1923 warning (OPT_Wformat,
1924 "use of %s and %s together with %<%%%c%> %s format",
1925 _(s->name), _(t->name), format_char,
1928 warning (OPT_Wformat, "use of %s and %s together in %s format",
1929 _(s->name), _(t->name), fki->name);
1933 /* Give Y2K warnings. */
1934 if (warn_format_y2k)
1937 if (strchr (fci->flags2, '4') != 0)
1938 if (strchr (flag_chars, 'E') != 0)
1942 else if (strchr (fci->flags2, '3') != 0)
1944 else if (strchr (fci->flags2, '2') != 0)
1947 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1948 "year in some locales", format_char);
1949 else if (y2k_level == 2)
1950 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1951 "year", format_char);
1954 if (strchr (fci->flags2, '[') != 0)
1956 /* Skip over scan set, in case it happens to have '%' in it. */
1957 if (*format_chars == '^')
1959 /* Find closing bracket; if one is hit immediately, then
1960 it's part of the scan set rather than a terminator. */
1961 if (*format_chars == ']')
1963 while (*format_chars && *format_chars != ']')
1965 if (*format_chars != ']')
1966 /* The end of the format string was reached. */
1967 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
1971 wanted_type_name = 0;
1972 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
1974 wanted_type = (fci->types[length_chars_val].type
1975 ? *fci->types[length_chars_val].type : 0);
1976 wanted_type_name = fci->types[length_chars_val].name;
1977 wanted_type_std = fci->types[length_chars_val].std;
1978 if (wanted_type == 0)
1980 warning (OPT_Wformat,
1981 "use of %qs length modifier with %qc type character",
1982 length_chars, format_char);
1983 /* Heuristic: skip one argument when an invalid length/type
1984 combination is encountered. */
1988 warning (OPT_Wformat, "too few arguments for format");
1991 params = TREE_CHAIN (params);
1995 /* Warn if non-standard, provided it is more non-standard
1996 than the length and type characters that may already
1997 have been warned for. */
1998 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
1999 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2001 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2002 warning (OPT_Wformat,
2003 "%s does not support the %<%%%s%c%> %s format",
2004 C_STD_NAME (wanted_type_std), length_chars,
2005 format_char, fki->name);
2009 main_wanted_type.next = NULL;
2011 /* Finally. . .check type of argument against desired type! */
2012 if (info->first_arg_num == 0)
2014 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2017 if (main_arg_num != 0)
2020 warning (OPT_Wformat, "operand number specified with "
2021 "suppressed assignment");
2023 warning (OPT_Wformat, "operand number specified for format "
2024 "taking no argument");
2029 format_wanted_type *wanted_type_ptr;
2031 if (main_arg_num != 0)
2033 arg_num = main_arg_num;
2034 params = main_arg_params;
2039 if (has_operand_number > 0)
2041 warning (OPT_Wformat, "missing $ operand number in format");
2045 has_operand_number = 0;
2048 wanted_type_ptr = &main_wanted_type;
2053 warning (OPT_Wformat, "too few arguments for format");
2057 cur_param = TREE_VALUE (params);
2058 params = TREE_CHAIN (params);
2060 wanted_type_ptr->wanted_type = wanted_type;
2061 wanted_type_ptr->wanted_type_name = wanted_type_name;
2062 wanted_type_ptr->pointer_count = fci->pointer_count + aflag;
2063 wanted_type_ptr->char_lenient_flag = 0;
2064 if (strchr (fci->flags2, 'c') != 0)
2065 wanted_type_ptr->char_lenient_flag = 1;
2066 wanted_type_ptr->writing_in_flag = 0;
2067 wanted_type_ptr->reading_from_flag = 0;
2069 wanted_type_ptr->writing_in_flag = 1;
2072 if (strchr (fci->flags2, 'W') != 0)
2073 wanted_type_ptr->writing_in_flag = 1;
2074 if (strchr (fci->flags2, 'R') != 0)
2075 wanted_type_ptr->reading_from_flag = 1;
2077 wanted_type_ptr->name = NULL;
2078 wanted_type_ptr->param = cur_param;
2079 wanted_type_ptr->arg_num = arg_num;
2080 wanted_type_ptr->next = NULL;
2081 if (last_wanted_type != 0)
2082 last_wanted_type->next = wanted_type_ptr;
2083 if (first_wanted_type == 0)
2084 first_wanted_type = wanted_type_ptr;
2085 last_wanted_type = wanted_type_ptr;
2090 wanted_type_ptr = GGC_NEW (format_wanted_type);
2092 wanted_type = *fci->types[length_chars_val].type;
2093 wanted_type_name = fci->types[length_chars_val].name;
2098 if (first_wanted_type != 0)
2099 check_format_types (first_wanted_type, format_start,
2100 format_chars - format_start);
2102 if (main_wanted_type.next != NULL)
2104 format_wanted_type *wanted_type_ptr = main_wanted_type.next;
2105 while (wanted_type_ptr)
2107 format_wanted_type *next = wanted_type_ptr->next;
2108 ggc_free (wanted_type_ptr);
2109 wanted_type_ptr = next;
2116 /* Check the argument types from a single format conversion (possibly
2117 including width and precision arguments). */
2119 check_format_types (format_wanted_type *types, const char *format_start,
2122 for (; types != 0; types = types->next)
2131 cur_param = types->param;
2132 cur_type = TREE_TYPE (cur_param);
2133 if (cur_type == error_mark_node)
2135 orig_cur_type = cur_type;
2137 wanted_type = types->wanted_type;
2138 arg_num = types->arg_num;
2140 /* The following should not occur here. */
2141 gcc_assert (wanted_type);
2142 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2144 if (types->pointer_count == 0)
2145 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2147 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2149 STRIP_NOPS (cur_param);
2151 /* Check the types of any additional pointer arguments
2152 that precede the "real" argument. */
2153 for (i = 0; i < types->pointer_count; ++i)
2155 if (TREE_CODE (cur_type) == POINTER_TYPE)
2157 cur_type = TREE_TYPE (cur_type);
2158 if (cur_type == error_mark_node)
2161 /* Check for writing through a NULL pointer. */
2162 if (types->writing_in_flag
2165 && integer_zerop (cur_param))
2166 warning (OPT_Wformat, "writing through null pointer "
2167 "(argument %d)", arg_num);
2169 /* Check for reading through a NULL pointer. */
2170 if (types->reading_from_flag
2173 && integer_zerop (cur_param))
2174 warning (OPT_Wformat, "reading through null pointer "
2175 "(argument %d)", arg_num);
2177 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2178 cur_param = TREE_OPERAND (cur_param, 0);
2182 /* See if this is an attempt to write into a const type with
2183 scanf or with printf "%n". Note: the writing in happens
2184 at the first indirection only, if for example
2185 void * const * is passed to scanf %p; passing
2186 const void ** is simply passing an incompatible type. */
2187 if (types->writing_in_flag
2189 && (TYPE_READONLY (cur_type)
2191 && (CONSTANT_CLASS_P (cur_param)
2192 || (DECL_P (cur_param)
2193 && TREE_READONLY (cur_param))))))
2194 warning (OPT_Wformat, "writing into constant object "
2195 "(argument %d)", arg_num);
2197 /* If there are extra type qualifiers beyond the first
2198 indirection, then this makes the types technically
2202 && (TYPE_READONLY (cur_type)
2203 || TYPE_VOLATILE (cur_type)
2204 || TYPE_RESTRICT (cur_type)))
2205 warning (OPT_Wformat, "extra type qualifiers in format "
2206 "argument (argument %d)",
2212 format_type_warning (types->name, format_start, format_length,
2213 wanted_type, types->pointer_count,
2214 types->wanted_type_name, orig_cur_type,
2220 if (i < types->pointer_count)
2223 cur_type = TYPE_MAIN_VARIANT (cur_type);
2225 /* Check whether the argument type is a character type. This leniency
2226 only applies to certain formats, flagged with 'c'.
2228 if (types->char_lenient_flag)
2229 char_type_flag = (cur_type == char_type_node
2230 || cur_type == signed_char_type_node
2231 || cur_type == unsigned_char_type_node);
2233 /* Check the type of the "real" argument, if there's a type we want. */
2234 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2236 /* If we want 'void *', allow any pointer type.
2237 (Anything else would already have got a warning.)
2238 With -pedantic, only allow pointers to void and to character
2240 if (wanted_type == void_type_node
2241 && (!pedantic || (i == 1 && char_type_flag)))
2243 /* Don't warn about differences merely in signedness, unless
2244 -pedantic. With -pedantic, warn if the type is a pointer
2245 target and not a character type, and for character types at
2246 a second level of indirection. */
2247 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2248 && TREE_CODE (cur_type) == INTEGER_TYPE
2249 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2250 && (TYPE_UNSIGNED (wanted_type)
2251 ? wanted_type == c_common_unsigned_type (cur_type)
2252 : wanted_type == c_common_signed_type (cur_type)))
2254 /* Likewise, "signed char", "unsigned char" and "char" are
2255 equivalent but the above test won't consider them equivalent. */
2256 if (wanted_type == char_type_node
2257 && (!pedantic || i < 2)
2260 /* Now we have a type mismatch. */
2261 format_type_warning (types->name, format_start, format_length,
2262 wanted_type, types->pointer_count,
2263 types->wanted_type_name, orig_cur_type, arg_num);
2268 /* Give a warning about a format argument of different type from that
2269 expected. DESCR is a description such as "field precision", or
2270 NULL for an ordinary format. For an ordinary format, FORMAT_START
2271 points to where the format starts in the format string and
2272 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2273 should have after POINTER_COUNT pointer dereferences.
2274 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2275 or NULL if the ordinary name of the type should be used. ARG_TYPE
2276 is the type of the actual argument. ARG_NUM is the number of that
2279 format_type_warning (const char *descr, const char *format_start,
2280 int format_length, tree wanted_type, int pointer_count,
2281 const char *wanted_type_name, tree arg_type, int arg_num)
2284 /* If ARG_TYPE is a typedef with a misleading name (for example,
2285 size_t but not the standard size_t expected by printf %zu), avoid
2286 printing the typedef name. */
2287 if (wanted_type_name
2288 && TYPE_NAME (arg_type)
2289 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2290 && DECL_NAME (TYPE_NAME (arg_type))
2291 && !strcmp (wanted_type_name,
2292 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2293 arg_type = TYPE_MAIN_VARIANT (arg_type);
2294 /* The format type and name exclude any '*' for pointers, so those
2295 must be formatted manually. For all the types we currently have,
2296 this is adequate, but formats taking pointers to functions or
2297 arrays would require the full type to be built up in order to
2298 print it with %T. */
2299 p = (char *) alloca (pointer_count + 2);
2300 if (pointer_count == 0)
2302 else if (c_dialect_cxx ())
2304 memset (p, '*', pointer_count);
2305 p[pointer_count] = 0;
2310 memset (p + 1, '*', pointer_count);
2311 p[pointer_count + 1] = 0;
2313 if (wanted_type_name)
2316 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2317 "but argument %d has type %qT",
2318 descr, wanted_type_name, p, arg_num, arg_type);
2320 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2321 "but argument %d has type %qT",
2322 format_length, format_start, wanted_type_name, p,
2328 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2329 "but argument %d has type %qT",
2330 descr, wanted_type, p, arg_num, arg_type);
2332 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2333 "but argument %d has type %qT",
2334 format_length, format_start, wanted_type, p, arg_num, arg_type);
2339 /* Given a format_char_info array FCI, and a character C, this function
2340 returns the index into the conversion_specs where that specifier's
2341 data is located. The character must exist. */
2343 find_char_info_specifier_index (const format_char_info *fci, int c)
2347 for (i = 0; fci->format_chars; i++, fci++)
2348 if (strchr (fci->format_chars, c))
2351 /* We shouldn't be looking for a non-existent specifier. */
2355 /* Given a format_length_info array FLI, and a character C, this
2356 function returns the index into the conversion_specs where that
2357 modifier's data is located. The character must exist. */
2359 find_length_info_modifier_index (const format_length_info *fli, int c)
2363 for (i = 0; fli->name; i++, fli++)
2364 if (strchr (fli->name, c))
2367 /* We shouldn't be looking for a non-existent modifier. */
2371 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2372 use in GCC's __asm_fprintf__ custom format attribute. You must
2373 have set dynamic_format_types before calling this function. */
2375 init_dynamic_asm_fprintf_info (void)
2381 format_length_info *new_asm_fprintf_length_specs;
2384 /* Find the underlying type for HOST_WIDE_INT. For the %w
2385 length modifier to work, one must have issued: "typedef
2386 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2387 prior to using that modifier. */
2388 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2391 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2394 hwi = identifier_global_value (hwi);
2395 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2397 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2400 hwi = DECL_ORIGINAL_TYPE (hwi);
2402 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2404 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2405 " or %<long long%>");
2409 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2410 new_asm_fprintf_length_specs = (format_length_info *)
2411 xmemdup (asm_fprintf_length_specs,
2412 sizeof (asm_fprintf_length_specs),
2413 sizeof (asm_fprintf_length_specs));
2415 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2416 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2417 if (hwi == long_integer_type_node)
2418 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2419 else if (hwi == long_long_integer_type_node)
2420 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2424 /* Assign the new data for use. */
2425 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2426 new_asm_fprintf_length_specs;
2430 /* Determine the type of a "locus" in the code being compiled for use
2431 in GCC's __gcc_gfc__ custom format attribute. You must have set
2432 dynamic_format_types before calling this function. */
2434 init_dynamic_gfc_info (void)
2440 static format_char_info *gfc_fci;
2442 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2443 must have declared 'locus' prior to using this attribute. If
2444 we haven't seen this declarations then you shouldn't use the
2445 specifier requiring that type. */
2446 if ((locus = maybe_get_identifier ("locus")))
2448 locus = identifier_global_value (locus);
2451 if (TREE_CODE (locus) != TYPE_DECL)
2453 error ("%<locus%> is not defined as a type");
2457 locus = TREE_TYPE (locus);
2461 /* Assign the new data for use. */
2463 /* Handle the __gcc_gfc__ format specifics. */
2465 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2466 gfc_fci = (format_char_info *)
2467 xmemdup (gcc_gfc_char_table,
2468 sizeof (gcc_gfc_char_table),
2469 sizeof (gcc_gfc_char_table));
2472 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2473 gfc_fci[i].types[0].type = &locus;
2474 gfc_fci[i].pointer_count = 1;
2479 /* Determine the types of "tree" and "location_t" in the code being
2480 compiled for use in GCC's diagnostic custom format attributes. You
2481 must have set dynamic_format_types before calling this function. */
2483 init_dynamic_diag_info (void)
2485 static tree t, loc, hwi;
2487 if (!loc || !t || !hwi)
2489 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2490 static format_length_info *diag_ls;
2493 /* For the GCC-diagnostics custom format specifiers to work, one
2494 must have declared 'tree' and/or 'location_t' prior to using
2495 those attributes. If we haven't seen these declarations then
2496 you shouldn't use the specifiers requiring these types.
2497 However we don't force a hard ICE because we may see only one
2498 or the other type. */
2499 if ((loc = maybe_get_identifier ("location_t")))
2501 loc = identifier_global_value (loc);
2504 if (TREE_CODE (loc) != TYPE_DECL)
2506 error ("%<location_t%> is not defined as a type");
2510 loc = TREE_TYPE (loc);
2514 /* We need to grab the underlying 'union tree_node' so peek into
2515 an extra type level. */
2516 if ((t = maybe_get_identifier ("tree")))
2518 t = identifier_global_value (t);
2521 if (TREE_CODE (t) != TYPE_DECL)
2523 error ("%<tree%> is not defined as a type");
2526 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2528 error ("%<tree%> is not defined as a pointer type");
2532 t = TREE_TYPE (TREE_TYPE (t));
2536 /* Find the underlying type for HOST_WIDE_INT. For the %w
2537 length modifier to work, one must have issued: "typedef
2538 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2539 prior to using that modifier. */
2540 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2542 hwi = identifier_global_value (hwi);
2545 if (TREE_CODE (hwi) != TYPE_DECL)
2547 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2552 hwi = DECL_ORIGINAL_TYPE (hwi);
2554 if (hwi != long_integer_type_node
2555 && hwi != long_long_integer_type_node)
2557 error ("%<__gcc_host_wide_int__%> is not defined"
2558 " as %<long%> or %<long long%>");
2565 /* Assign the new data for use. */
2567 /* All the GCC diag formats use the same length specs. */
2569 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2570 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2571 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2572 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2573 diag_ls = (format_length_info *)
2574 xmemdup (gcc_diag_length_specs,
2575 sizeof (gcc_diag_length_specs),
2576 sizeof (gcc_diag_length_specs));
2579 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2580 i = find_length_info_modifier_index (diag_ls, 'w');
2581 if (hwi == long_integer_type_node)
2582 diag_ls[i].index = FMT_LEN_l;
2583 else if (hwi == long_long_integer_type_node)
2584 diag_ls[i].index = FMT_LEN_ll;
2589 /* Handle the __gcc_diag__ format specifics. */
2591 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2592 diag_fci = (format_char_info *)
2593 xmemdup (gcc_diag_char_table,
2594 sizeof (gcc_diag_char_table),
2595 sizeof (gcc_diag_char_table));
2598 i = find_char_info_specifier_index (diag_fci, 'H');
2599 diag_fci[i].types[0].type = &loc;
2600 diag_fci[i].pointer_count = 1;
2604 i = find_char_info_specifier_index (diag_fci, 'J');
2605 diag_fci[i].types[0].type = &t;
2606 diag_fci[i].pointer_count = 1;
2609 /* Handle the __gcc_tdiag__ format specifics. */
2611 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2612 tdiag_fci = (format_char_info *)
2613 xmemdup (gcc_tdiag_char_table,
2614 sizeof (gcc_tdiag_char_table),
2615 sizeof (gcc_tdiag_char_table));
2618 i = find_char_info_specifier_index (tdiag_fci, 'H');
2619 tdiag_fci[i].types[0].type = &loc;
2620 tdiag_fci[i].pointer_count = 1;
2624 /* All specifiers taking a tree share the same struct. */
2625 i = find_char_info_specifier_index (tdiag_fci, 'D');
2626 tdiag_fci[i].types[0].type = &t;
2627 tdiag_fci[i].pointer_count = 1;
2628 i = find_char_info_specifier_index (tdiag_fci, 'J');
2629 tdiag_fci[i].types[0].type = &t;
2630 tdiag_fci[i].pointer_count = 1;
2633 /* Handle the __gcc_cdiag__ format specifics. */
2635 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2636 cdiag_fci = (format_char_info *)
2637 xmemdup (gcc_cdiag_char_table,
2638 sizeof (gcc_cdiag_char_table),
2639 sizeof (gcc_cdiag_char_table));
2642 i = find_char_info_specifier_index (cdiag_fci, 'H');
2643 cdiag_fci[i].types[0].type = &loc;
2644 cdiag_fci[i].pointer_count = 1;
2648 /* All specifiers taking a tree share the same struct. */
2649 i = find_char_info_specifier_index (cdiag_fci, 'D');
2650 cdiag_fci[i].types[0].type = &t;
2651 cdiag_fci[i].pointer_count = 1;
2652 i = find_char_info_specifier_index (cdiag_fci, 'J');
2653 cdiag_fci[i].types[0].type = &t;
2654 cdiag_fci[i].pointer_count = 1;
2657 /* Handle the __gcc_cxxdiag__ format specifics. */
2659 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2660 cxxdiag_fci = (format_char_info *)
2661 xmemdup (gcc_cxxdiag_char_table,
2662 sizeof (gcc_cxxdiag_char_table),
2663 sizeof (gcc_cxxdiag_char_table));
2666 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2667 cxxdiag_fci[i].types[0].type = &loc;
2668 cxxdiag_fci[i].pointer_count = 1;
2672 /* All specifiers taking a tree share the same struct. */
2673 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2674 cxxdiag_fci[i].types[0].type = &t;
2675 cxxdiag_fci[i].pointer_count = 1;
2676 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2677 cxxdiag_fci[i].types[0].type = &t;
2678 cxxdiag_fci[i].pointer_count = 1;
2683 #ifdef TARGET_FORMAT_TYPES
2684 extern const format_kind_info TARGET_FORMAT_TYPES[];
2687 /* Handle a "format" attribute; arguments as in
2688 struct attribute_spec.handler. */
2690 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2691 int flags, bool *no_add_attrs)
2694 function_format_info info;
2697 #ifdef TARGET_FORMAT_TYPES
2698 /* If the target provides additional format types, we need to
2699 add them to FORMAT_TYPES at first use. */
2700 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2702 dynamic_format_types = xmalloc ((n_format_types + TARGET_N_FORMAT_TYPES)
2703 * sizeof (dynamic_format_types[0]));
2704 memcpy (dynamic_format_types, format_types_orig,
2705 sizeof (format_types_orig));
2706 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2707 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2709 format_types = dynamic_format_types;
2710 n_format_types += TARGET_N_FORMAT_TYPES;
2714 if (!decode_format_attr (args, &info, 0))
2716 *no_add_attrs = true;
2720 argument = TYPE_ARG_TYPES (type);
2723 if (!check_format_string (argument, info.format_num, flags,
2727 if (info.first_arg_num != 0)
2729 unsigned HOST_WIDE_INT arg_num = 1;
2731 /* Verify that first_arg_num points to the last arg,
2734 arg_num++, argument = TREE_CHAIN (argument);
2736 if (arg_num != info.first_arg_num)
2738 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2739 error ("args to be formatted is not %<...%>");
2740 *no_add_attrs = true;
2746 if (info.format_type == strftime_format_type && info.first_arg_num != 0)
2748 error ("strftime formats cannot format arguments");
2749 *no_add_attrs = true;
2753 /* If this is a custom GCC-internal format type, we have to
2754 initialize certain bits a runtime. */
2755 if (info.format_type == asm_fprintf_format_type
2756 || info.format_type == gcc_gfc_format_type
2757 || info.format_type == gcc_diag_format_type
2758 || info.format_type == gcc_tdiag_format_type
2759 || info.format_type == gcc_cdiag_format_type
2760 || info.format_type == gcc_cxxdiag_format_type)
2762 /* Our first time through, we have to make sure that our
2763 format_type data is allocated dynamically and is modifiable. */
2764 if (!dynamic_format_types)
2765 format_types = dynamic_format_types = (format_kind_info *)
2766 xmemdup (format_types_orig, sizeof (format_types_orig),
2767 sizeof (format_types_orig));
2769 /* If this is format __asm_fprintf__, we have to initialize
2770 GCC's notion of HOST_WIDE_INT for checking %wd. */
2771 if (info.format_type == asm_fprintf_format_type)
2772 init_dynamic_asm_fprintf_info ();
2773 /* If this is format __gcc_gfc__, we have to initialize GCC's
2774 notion of 'locus' at runtime for %L. */
2775 else if (info.format_type == gcc_gfc_format_type)
2776 init_dynamic_gfc_info ();
2777 /* If this is one of the diagnostic attributes, then we have to
2778 initialize 'location_t' and 'tree' at runtime. */
2779 else if (info.format_type == gcc_diag_format_type
2780 || info.format_type == gcc_tdiag_format_type
2781 || info.format_type == gcc_cdiag_format_type
2782 || info.format_type == gcc_cxxdiag_format_type)
2783 init_dynamic_diag_info ();