1 /* Check calls to formatted I/O functions (-Wformat).
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 #include "coretypes.h"
31 #include "diagnostic.h"
32 #include "langhooks.h"
35 /* Set format warning options according to a -Wformat=n option. */
38 set_Wformat (int setting)
40 warn_format = setting;
41 warn_format_extra_args = setting;
42 warn_format_zero_length = setting;
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 scanf_format_type, strftime_format_type,
66 strfmon_format_type, format_type_error = -1};
68 typedef struct function_format_info
70 int format_type; /* type of format (printf, scanf, etc.) */
71 unsigned HOST_WIDE_INT format_num; /* number of format argument */
72 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */
73 } function_format_info;
75 static bool decode_format_attr (tree, function_format_info *, int);
76 static int decode_format_type (const char *);
78 static bool check_format_string (tree argument,
79 unsigned HOST_WIDE_INT format_num,
80 int flags, bool *no_add_attrs);
81 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
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 info->format_type = decode_format_type (p);
196 if (info->format_type == format_type_error)
198 gcc_assert (!validated_p);
199 warning (OPT_Wformat, "%qE is an unrecognized format function type",
205 if (!get_constant (format_num_expr, &info->format_num, validated_p))
207 error ("format string has invalid operand number");
211 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
213 error ("%<...%> has invalid operand number");
217 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
219 gcc_assert (!validated_p);
220 error ("format string argument follows the args to be formatted");
227 /* Check a call to a format function against a parameter list. */
229 /* The C standard version C++ is treated as equivalent to
230 or inheriting from, for the purpose of format features supported. */
231 #define CPLUSPLUS_STD_VER STD_C94
232 /* The C standard version we are checking formats against when pedantic. */
233 #define C_STD_VER ((int) (c_dialect_cxx () \
234 ? CPLUSPLUS_STD_VER \
237 : (flag_isoc94 ? STD_C94 : STD_C89))))
238 /* The name to give to the standard version we are warning about when
239 pedantic. FEATURE_VER is the version in which the feature warned out
240 appeared, which is higher than C_STD_VER. */
241 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
243 : ((FEATURE_VER) == STD_EXT \
246 /* Adjust a C standard version, which may be STD_C9L, to account for
247 -Wno-long-long. Returns other standard versions unchanged. */
248 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
249 ? (warn_long_long ? STD_C99 : STD_C89) \
252 /* Structure describing details of a type expected in format checking,
253 and the type to check against it. */
254 typedef struct format_wanted_type
256 /* The type wanted. */
258 /* The name of this type to use in diagnostics. */
259 const char *wanted_type_name;
260 /* The level of indirection through pointers at which this type occurs. */
262 /* Whether, when pointer_count is 1, to allow any character type when
263 pedantic, rather than just the character or void type specified. */
264 int char_lenient_flag;
265 /* Whether the argument, dereferenced once, is written into and so the
266 argument must not be a pointer to a const-qualified type. */
268 /* Whether the argument, dereferenced once, is read from and so
269 must not be a NULL pointer. */
270 int reading_from_flag;
271 /* If warnings should be of the form "field precision should have
272 type 'int'", the name to use (in this case "field precision"),
273 otherwise NULL, for "format expects type 'long'" type
276 /* The actual parameter to check against the wanted type. */
278 /* The argument number of that parameter. */
280 /* The next type to check for this format conversion, or NULL if none. */
281 struct format_wanted_type *next;
282 } format_wanted_type;
285 static const format_length_info printf_length_specs[] =
287 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
288 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
289 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
290 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
291 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
292 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
293 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
294 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
295 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 },
296 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
297 { NULL, 0, 0, NULL, 0, 0 }
300 /* Length specifiers valid for asm_fprintf. */
301 static const format_length_info asm_fprintf_length_specs[] =
303 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
304 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
305 { NULL, 0, 0, NULL, 0, 0 }
308 /* Length specifiers valid for GCC diagnostics. */
309 static const format_length_info gcc_diag_length_specs[] =
311 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
312 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
313 { NULL, 0, 0, NULL, 0, 0 }
316 /* The custom diagnostics all accept the same length specifiers. */
317 #define gcc_tdiag_length_specs gcc_diag_length_specs
318 #define gcc_cdiag_length_specs gcc_diag_length_specs
319 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
321 /* This differs from printf_length_specs only in that "Z" is not accepted. */
322 static const format_length_info scanf_length_specs[] =
324 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
325 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
326 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
327 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
328 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
329 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
330 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
331 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 },
332 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
333 { NULL, 0, 0, NULL, 0, 0 }
337 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
338 make no sense for a format type not part of any C standard version. */
339 static const format_length_info strfmon_length_specs[] =
341 /* A GNU extension. */
342 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
343 { NULL, 0, 0, NULL, 0, 0 }
346 static const format_flag_spec printf_flag_specs[] =
348 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
349 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
350 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
351 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
352 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
353 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
354 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
355 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
356 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
357 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
358 { 0, 0, 0, NULL, NULL, 0 }
362 static const format_flag_pair printf_flag_pairs[] =
366 { '0', 'p', 1, 'i' },
370 static const format_flag_spec asm_fprintf_flag_specs[] =
372 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
373 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
374 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
375 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
376 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
377 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
378 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
379 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
380 { 0, 0, 0, NULL, NULL, 0 }
383 static const format_flag_pair asm_fprintf_flag_pairs[] =
387 { '0', 'p', 1, 'i' },
391 static const format_flag_pair gcc_diag_flag_pairs[] =
396 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
397 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
398 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
400 static const format_flag_pair gcc_gfc_flag_pairs[] =
405 static const format_flag_spec gcc_diag_flag_specs[] =
407 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
408 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
409 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
410 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
411 { 0, 0, 0, NULL, NULL, 0 }
414 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
415 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
417 static const format_flag_spec gcc_cxxdiag_flag_specs[] =
419 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
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, 0 }
427 static const format_flag_spec scanf_flag_specs[] =
429 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
430 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
431 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
432 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
433 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
434 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
435 { 0, 0, 0, NULL, NULL, 0 }
439 static const format_flag_pair scanf_flag_pairs[] =
446 static const format_flag_spec strftime_flag_specs[] =
448 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
449 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
450 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
451 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
452 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
453 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
454 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
455 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
456 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
457 { 0, 0, 0, NULL, NULL, 0 }
461 static const format_flag_pair strftime_flag_pairs[] =
472 static const format_flag_spec strfmon_flag_specs[] =
474 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
475 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
476 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
477 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
478 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
479 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
480 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
481 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
482 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
483 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
484 { 0, 0, 0, NULL, NULL, 0 }
487 static const format_flag_pair strfmon_flag_pairs[] =
494 static const format_char_info print_char_table[] =
496 /* C89 conversion specifiers. */
497 { "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 },
498 { "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 },
499 { "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 },
500 { "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 },
501 { "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 },
502 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
503 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
504 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
505 { "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 },
506 /* C99 conversion specifiers. */
507 { "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 },
508 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
509 /* X/Open conversion specifiers. */
510 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
511 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
512 /* GNU conversion specifiers. */
513 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
514 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
517 static const format_char_info asm_fprintf_char_table[] =
519 /* C89 conversion specifiers. */
520 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
521 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
522 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
523 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
524 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
526 /* asm_fprintf conversion specifiers. */
527 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
528 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
529 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
530 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
531 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
532 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
533 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
534 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
537 static const format_char_info gcc_diag_char_table[] =
539 /* C89 conversion specifiers. */
540 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
541 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
542 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
543 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
544 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
545 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
547 /* Custom conversion specifiers. */
549 /* %H will require "location_t" at runtime. */
550 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
552 /* These will require a "tree" at runtime. */
553 { "J", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
555 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
556 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
557 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
560 static const format_char_info gcc_tdiag_char_table[] =
562 /* C89 conversion specifiers. */
563 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
564 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
565 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
566 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
567 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
568 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
570 /* Custom conversion specifiers. */
572 /* %H will require "location_t" at runtime. */
573 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
575 /* These will require a "tree" at runtime. */
576 { "DFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
578 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
579 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
580 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
583 static const format_char_info gcc_cdiag_char_table[] =
585 /* C89 conversion specifiers. */
586 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
587 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
588 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
589 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
590 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
591 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
593 /* Custom conversion specifiers. */
595 /* %H will require "location_t" at runtime. */
596 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
598 /* These will require a "tree" at runtime. */
599 { "DEFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
601 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
602 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
603 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
606 static const format_char_info gcc_cxxdiag_char_table[] =
608 /* C89 conversion specifiers. */
609 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
610 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
611 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
612 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
613 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
614 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
616 /* Custom conversion specifiers. */
618 /* %H will require "location_t" at runtime. */
619 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
621 /* These will require a "tree" at runtime. */
622 { "ADEFJTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
624 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
625 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
627 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
628 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
629 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
632 static const format_char_info gcc_gfc_char_table[] =
634 /* C89 conversion specifiers. */
635 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
636 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
637 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
639 /* gfc conversion specifiers. */
641 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
643 /* This will require a "locus" at runtime. */
644 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
646 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
649 static const format_char_info scan_char_table[] =
651 /* C89 conversion specifiers. */
652 { "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 },
653 { "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 },
654 { "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 },
655 { "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 },
656 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW", NULL },
657 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW", NULL },
658 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[", NULL },
659 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
660 { "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 },
661 /* C99 conversion specifiers. */
662 { "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 },
663 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
664 /* X/Open conversion specifiers. */
665 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
666 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W", NULL },
667 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
670 static const format_char_info time_char_table[] =
672 /* C89 conversion specifiers. */
673 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
674 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
675 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
676 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
677 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
678 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
679 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
680 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
681 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
682 /* C99 conversion specifiers. */
683 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
684 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
685 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
686 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
687 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
688 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
689 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
690 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
691 /* GNU conversion specifiers. */
692 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
693 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
694 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
697 static const format_char_info monetary_char_table[] =
699 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
700 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
703 /* This must be in the same order as enum format_type. */
704 static const format_kind_info format_types_orig[] =
706 { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
707 printf_flag_specs, printf_flag_pairs,
708 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
710 &integer_type_node, &integer_type_node
712 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
713 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
714 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
718 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
719 gcc_diag_flag_specs, gcc_diag_flag_pairs,
720 FMT_FLAG_ARG_CONVERT,
722 NULL, &integer_type_node
724 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
725 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
726 FMT_FLAG_ARG_CONVERT,
728 NULL, &integer_type_node
730 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
731 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
732 FMT_FLAG_ARG_CONVERT,
734 NULL, &integer_type_node
736 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
737 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
738 FMT_FLAG_ARG_CONVERT,
740 NULL, &integer_type_node
742 { "gcc_gfc", NULL, gcc_gfc_char_table, "", NULL,
743 NULL, gcc_gfc_flag_pairs,
744 FMT_FLAG_ARG_CONVERT,
748 { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
749 scanf_flag_specs, scanf_flag_pairs,
750 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
754 { "strftime", NULL, time_char_table, "_-0^#", "EO",
755 strftime_flag_specs, strftime_flag_pairs,
756 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0,
759 { "strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
760 strfmon_flag_specs, strfmon_flag_pairs,
761 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L',
766 /* This layer of indirection allows GCC to reassign format_types with
767 new data if necessary, while still allowing the original data to be
769 static const format_kind_info *format_types = format_types_orig;
770 /* We can modify this one. We also add target-specific format types
771 to the end of the array. */
772 static format_kind_info *dynamic_format_types;
774 static int n_format_types = ARRAY_SIZE (format_types_orig);
776 /* Structure detailing the results of checking a format function call
777 where the format expression may be a conditional expression with
778 many leaves resulting from nested conditional expressions. */
781 /* Number of leaves of the format argument that could not be checked
782 as they were not string literals. */
783 int number_non_literal;
784 /* Number of leaves of the format argument that were null pointers or
785 string literals, but had extra format arguments. */
786 int number_extra_args;
787 /* Number of leaves of the format argument that were null pointers or
788 string literals, but had extra format arguments and used $ operand
790 int number_dollar_extra_args;
791 /* Number of leaves of the format argument that were wide string
794 /* Number of leaves of the format argument that were empty strings. */
796 /* Number of leaves of the format argument that were unterminated
798 int number_unterminated;
799 /* Number of leaves of the format argument that were not counted above. */
801 } format_check_results;
805 format_check_results *res;
806 function_format_info *info;
808 } format_check_context;
810 static void check_format_info (function_format_info *, tree);
811 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
812 static void check_format_info_main (format_check_results *,
813 function_format_info *,
814 const char *, int, tree,
815 unsigned HOST_WIDE_INT);
817 static void init_dollar_format_checking (int, tree);
818 static int maybe_read_dollar_number (const char **, int,
819 tree, tree *, const format_kind_info *);
820 static bool avoid_dollar_number (const char *);
821 static void finish_dollar_format_checking (format_check_results *, int);
823 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
826 static void check_format_types (format_wanted_type *, const char *, int);
827 static void format_type_warning (const char *, const char *, int, tree,
828 int, const char *, tree, int);
830 /* Decode a format type from a string, returning the type, or
831 format_type_error if not valid, in which case the caller should print an
834 decode_format_type (const char *s)
839 for (i = 0; i < n_format_types; i++)
842 if (!strcmp (s, format_types[i].name))
844 alen = strlen (format_types[i].name);
845 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
846 && s[slen - 1] == '_' && s[slen - 2] == '_'
847 && !strncmp (s + 2, format_types[i].name, alen))
850 return format_type_error;
854 /* Check the argument list of a call to printf, scanf, etc.
855 ATTRS are the attributes on the function type. There are NARGS argument
856 values in the array ARGARRAY.
857 Also, if -Wmissing-format-attribute,
858 warn for calls to vprintf or vscanf in functions with no such format
859 attribute themselves. */
862 check_function_format (tree attrs, int nargs, tree *argarray)
866 /* See if this function has any format attributes. */
867 for (a = attrs; a; a = TREE_CHAIN (a))
869 if (is_attribute_p ("format", TREE_PURPOSE (a)))
872 function_format_info info;
873 decode_format_attr (TREE_VALUE (a), &info, 1);
876 /* FIXME: Rewrite all the internal functions in this file
877 to use the ARGARRAY directly instead of constructing this
879 tree params = NULL_TREE;
881 for (i = nargs - 1; i >= 0; i--)
882 params = tree_cons (NULL_TREE, argarray[i], params);
883 check_format_info (&info, params);
885 if (warn_missing_format_attribute && info.first_arg_num == 0
886 && (format_types[info.format_type].flags
887 & (int) FMT_FLAG_ARG_CONVERT))
890 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
893 if (is_attribute_p ("format", TREE_PURPOSE (c))
894 && (decode_format_type (IDENTIFIER_POINTER
895 (TREE_VALUE (TREE_VALUE (c))))
896 == info.format_type))
900 /* Check if the current function has a parameter to which
901 the format attribute could be attached; if not, it
902 can't be a candidate for a format attribute, despite
903 the vprintf-like or vscanf-like call. */
905 for (args = DECL_ARGUMENTS (current_function_decl);
907 args = TREE_CHAIN (args))
909 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
910 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
915 warning (OPT_Wmissing_format_attribute, "function might "
916 "be possible candidate for %qs format attribute",
917 format_types[info.format_type].name);
925 /* Variables used by the checking of $ operand number formats. */
926 static char *dollar_arguments_used = NULL;
927 static char *dollar_arguments_pointer_p = NULL;
928 static int dollar_arguments_alloc = 0;
929 static int dollar_arguments_count;
930 static int dollar_first_arg_num;
931 static int dollar_max_arg_used;
932 static int dollar_format_warned;
934 /* Initialize the checking for a format string that may contain $
935 parameter number specifications; we will need to keep track of whether
936 each parameter has been used. FIRST_ARG_NUM is the number of the first
937 argument that is a parameter to the format, or 0 for a vprintf-style
938 function; PARAMS is the list of arguments starting at this argument. */
941 init_dollar_format_checking (int first_arg_num, tree params)
943 tree oparams = params;
945 dollar_first_arg_num = first_arg_num;
946 dollar_arguments_count = 0;
947 dollar_max_arg_used = 0;
948 dollar_format_warned = 0;
949 if (first_arg_num > 0)
953 dollar_arguments_count++;
954 params = TREE_CHAIN (params);
957 if (dollar_arguments_alloc < dollar_arguments_count)
959 if (dollar_arguments_used)
960 free (dollar_arguments_used);
961 if (dollar_arguments_pointer_p)
962 free (dollar_arguments_pointer_p);
963 dollar_arguments_alloc = dollar_arguments_count;
964 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
965 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
967 if (dollar_arguments_alloc)
969 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
970 if (first_arg_num > 0)
976 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
978 params = TREE_CHAIN (params);
986 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
987 is set, it is an error if one is not found; otherwise, it is OK. If
988 such a number is found, check whether it is within range and mark that
989 numbered operand as being used for later checking. Returns the operand
990 number if found and within range, zero if no such number was found and
991 this is OK, or -1 on error. PARAMS points to the first operand of the
992 format; PARAM_PTR is made to point to the parameter referred to. If
993 a $ format is found, *FORMAT is updated to point just after it. */
996 maybe_read_dollar_number (const char **format,
997 int dollar_needed, tree params, tree *param_ptr,
998 const format_kind_info *fki)
1002 const char *fcp = *format;
1003 if (!ISDIGIT (*fcp))
1007 warning (OPT_Wformat, "missing $ operand number in format");
1015 while (ISDIGIT (*fcp))
1018 nargnum = 10 * argnum + (*fcp - '0');
1019 if (nargnum < 0 || nargnum / 10 != argnum)
1028 warning (OPT_Wformat, "missing $ operand number in format");
1035 if (pedantic && !dollar_format_warned)
1037 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1038 C_STD_NAME (STD_EXT));
1039 dollar_format_warned = 1;
1041 if (overflow_flag || argnum == 0
1042 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1044 warning (OPT_Wformat, "operand number out of range in format");
1047 if (argnum > dollar_max_arg_used)
1048 dollar_max_arg_used = argnum;
1049 /* For vprintf-style functions we may need to allocate more memory to
1050 track which arguments are used. */
1051 while (dollar_arguments_alloc < dollar_max_arg_used)
1054 nalloc = 2 * dollar_arguments_alloc + 16;
1055 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1057 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1059 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1060 nalloc - dollar_arguments_alloc);
1061 dollar_arguments_alloc = nalloc;
1063 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1064 && dollar_arguments_used[argnum - 1] == 1)
1066 dollar_arguments_used[argnum - 1] = 2;
1067 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1071 dollar_arguments_used[argnum - 1] = 1;
1072 if (dollar_first_arg_num)
1075 *param_ptr = params;
1076 for (i = 1; i < argnum && *param_ptr != 0; i++)
1077 *param_ptr = TREE_CHAIN (*param_ptr);
1079 /* This case shouldn't be caught here. */
1080 gcc_assert (*param_ptr);
1087 /* Ensure that FORMAT does not start with a decimal number followed by
1088 a $; give a diagnostic and return true if it does, false otherwise. */
1091 avoid_dollar_number (const char *format)
1093 if (!ISDIGIT (*format))
1095 while (ISDIGIT (*format))
1099 warning (OPT_Wformat, "$ operand number used after format without operand number");
1106 /* Finish the checking for a format string that used $ operand number formats
1107 instead of non-$ formats. We check for unused operands before used ones
1108 (a serious error, since the implementation of the format function
1109 can't know what types to pass to va_arg to find the later arguments).
1110 and for unused operands at the end of the format (if we know how many
1111 arguments the format had, so not for vprintf). If there were operand
1112 numbers out of range on a non-vprintf-style format, we won't have reached
1113 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1117 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1120 bool found_pointer_gap = false;
1121 for (i = 0; i < dollar_max_arg_used; i++)
1123 if (!dollar_arguments_used[i])
1125 if (pointer_gap_ok && (dollar_first_arg_num == 0
1126 || dollar_arguments_pointer_p[i]))
1127 found_pointer_gap = true;
1129 warning (OPT_Wformat,
1130 "format argument %d unused before used argument %d in $-style format",
1131 i + 1, dollar_max_arg_used);
1134 if (found_pointer_gap
1135 || (dollar_first_arg_num
1136 && dollar_max_arg_used < dollar_arguments_count))
1138 res->number_other--;
1139 res->number_dollar_extra_args++;
1144 /* Retrieve the specification for a format flag. SPEC contains the
1145 specifications for format flags for the applicable kind of format.
1146 FLAG is the flag in question. If PREDICATES is NULL, the basic
1147 spec for that flag must be retrieved and must exist. If
1148 PREDICATES is not NULL, it is a string listing possible predicates
1149 for the spec entry; if an entry predicated on any of these is
1150 found, it is returned, otherwise NULL is returned. */
1152 static const format_flag_spec *
1153 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1156 for (i = 0; spec[i].flag_char != 0; i++)
1158 if (spec[i].flag_char != flag)
1160 if (predicates != NULL)
1162 if (spec[i].predicate != 0
1163 && strchr (predicates, spec[i].predicate) != 0)
1166 else if (spec[i].predicate == 0)
1169 gcc_assert (predicates);
1174 /* Check the argument list of a call to printf, scanf, etc.
1175 INFO points to the function_format_info structure.
1176 PARAMS is the list of argument values. */
1179 check_format_info (function_format_info *info, tree params)
1181 format_check_context format_ctx;
1182 unsigned HOST_WIDE_INT arg_num;
1184 format_check_results res;
1185 /* Skip to format argument. If the argument isn't available, there's
1186 no work for us to do; prototype checking will catch the problem. */
1187 for (arg_num = 1; ; ++arg_num)
1191 if (arg_num == info->format_num)
1193 params = TREE_CHAIN (params);
1195 format_tree = TREE_VALUE (params);
1196 params = TREE_CHAIN (params);
1197 if (format_tree == 0)
1200 res.number_non_literal = 0;
1201 res.number_extra_args = 0;
1202 res.number_dollar_extra_args = 0;
1203 res.number_wide = 0;
1204 res.number_empty = 0;
1205 res.number_unterminated = 0;
1206 res.number_other = 0;
1208 format_ctx.res = &res;
1209 format_ctx.info = info;
1210 format_ctx.params = params;
1212 check_function_arguments_recurse (check_format_arg, &format_ctx,
1213 format_tree, arg_num);
1215 if (res.number_non_literal > 0)
1217 /* Functions taking a va_list normally pass a non-literal format
1218 string. These functions typically are declared with
1219 first_arg_num == 0, so avoid warning in those cases. */
1220 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1222 /* For strftime-like formats, warn for not checking the format
1223 string; but there are no arguments to check. */
1224 warning (OPT_Wformat_nonliteral,
1225 "format not a string literal, format string not checked");
1227 else if (info->first_arg_num != 0)
1229 /* If there are no arguments for the format at all, we may have
1230 printf (foo) which is likely to be a security hole. */
1231 while (arg_num + 1 < info->first_arg_num)
1235 params = TREE_CHAIN (params);
1238 if (params == 0 && warn_format_security)
1239 warning (OPT_Wformat_security,
1240 "format not a string literal and no format arguments");
1241 else if (params == 0 && warn_format_nonliteral)
1242 warning (OPT_Wformat_nonliteral,
1243 "format not a string literal and no format arguments");
1245 warning (OPT_Wformat_nonliteral,
1246 "format not a string literal, argument types not checked");
1250 /* If there were extra arguments to the format, normally warn. However,
1251 the standard does say extra arguments are ignored, so in the specific
1252 case where we have multiple leaves (conditional expressions or
1253 ngettext) allow extra arguments if at least one leaf didn't have extra
1254 arguments, but was otherwise OK (either non-literal or checked OK).
1255 If the format is an empty string, this should be counted similarly to the
1256 case of extra format arguments. */
1257 if (res.number_extra_args > 0 && res.number_non_literal == 0
1258 && res.number_other == 0)
1259 warning (OPT_Wformat_extra_args, "too many arguments for format");
1260 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1261 && res.number_other == 0)
1262 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1263 if (res.number_empty > 0 && res.number_non_literal == 0
1264 && res.number_other == 0)
1265 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1266 format_types[info->format_type].name);
1268 if (res.number_wide > 0)
1269 warning (OPT_Wformat, "format is a wide character string");
1271 if (res.number_unterminated > 0)
1272 warning (OPT_Wformat, "unterminated format string");
1275 /* Callback from check_function_arguments_recurse to check a
1276 format string. FORMAT_TREE is the format parameter. ARG_NUM
1277 is the number of the format argument. CTX points to a
1278 format_check_context. */
1281 check_format_arg (void *ctx, tree format_tree,
1282 unsigned HOST_WIDE_INT arg_num)
1284 format_check_context *format_ctx = (format_check_context *) ctx;
1285 format_check_results *res = format_ctx->res;
1286 function_format_info *info = format_ctx->info;
1287 tree params = format_ctx->params;
1290 HOST_WIDE_INT offset;
1291 const char *format_chars;
1292 tree array_size = 0;
1295 if (integer_zerop (format_tree))
1297 /* Skip to first argument to check, so we can see if this format
1298 has any arguments (it shouldn't). */
1299 while (arg_num + 1 < info->first_arg_num)
1303 params = TREE_CHAIN (params);
1308 res->number_other++;
1310 res->number_extra_args++;
1316 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1320 arg0 = TREE_OPERAND (format_tree, 0);
1321 arg1 = TREE_OPERAND (format_tree, 1);
1324 if (TREE_CODE (arg1) == INTEGER_CST)
1328 res->number_non_literal++;
1331 if (!host_integerp (arg1, 0)
1332 || (offset = tree_low_cst (arg1, 0)) < 0)
1334 res->number_non_literal++;
1338 if (TREE_CODE (format_tree) != ADDR_EXPR)
1340 res->number_non_literal++;
1343 format_tree = TREE_OPERAND (format_tree, 0);
1344 if (TREE_CODE (format_tree) == ARRAY_REF
1345 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1346 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1347 format_tree = TREE_OPERAND (format_tree, 0);
1348 if (TREE_CODE (format_tree) == VAR_DECL
1349 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1350 && (array_init = decl_constant_value (format_tree)) != format_tree
1351 && TREE_CODE (array_init) == STRING_CST)
1353 /* Extract the string constant initializer. Note that this may include
1354 a trailing NUL character that is not in the array (e.g.
1355 const char a[3] = "foo";). */
1356 array_size = DECL_SIZE_UNIT (format_tree);
1357 format_tree = array_init;
1359 if (TREE_CODE (format_tree) != STRING_CST)
1361 res->number_non_literal++;
1364 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1369 format_chars = TREE_STRING_POINTER (format_tree);
1370 format_length = TREE_STRING_LENGTH (format_tree);
1371 if (array_size != 0)
1373 /* Variable length arrays can't be initialized. */
1374 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1376 if (host_integerp (array_size, 0))
1378 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1379 if (array_size_value > 0
1380 && array_size_value == (int) array_size_value
1381 && format_length > array_size_value)
1382 format_length = array_size_value;
1387 if (offset >= format_length)
1389 res->number_non_literal++;
1392 format_chars += offset;
1393 format_length -= offset;
1395 if (format_length < 1)
1397 res->number_unterminated++;
1400 if (format_length == 1)
1402 res->number_empty++;
1405 if (format_chars[--format_length] != 0)
1407 res->number_unterminated++;
1411 /* Skip to first argument to check. */
1412 while (arg_num + 1 < info->first_arg_num)
1416 params = TREE_CHAIN (params);
1419 /* Provisionally increment res->number_other; check_format_info_main
1420 will decrement it if it finds there are extra arguments, but this way
1421 need not adjust it for every return. */
1422 res->number_other++;
1423 check_format_info_main (res, info, format_chars, format_length,
1428 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1429 is the NUL-terminated format string (which at this point may contain
1430 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1431 terminating NUL character). ARG_NUM is one less than the number of
1432 the first format argument to check; PARAMS points to that format
1433 argument in the list of arguments. */
1436 check_format_info_main (format_check_results *res,
1437 function_format_info *info, const char *format_chars,
1438 int format_length, tree params,
1439 unsigned HOST_WIDE_INT arg_num)
1441 const char *orig_format_chars = format_chars;
1442 tree first_fillin_param = params;
1444 const format_kind_info *fki = &format_types[info->format_type];
1445 const format_flag_spec *flag_specs = fki->flag_specs;
1446 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1448 /* -1 if no conversions taking an operand have been found; 0 if one has
1449 and it didn't use $; 1 if $ formats are in use. */
1450 int has_operand_number = -1;
1452 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1457 int suppressed = FALSE;
1458 const char *length_chars = NULL;
1459 enum format_lengths length_chars_val = FMT_LEN_none;
1460 enum format_std_version length_chars_std = STD_C89;
1464 int main_arg_num = 0;
1465 tree main_arg_params = 0;
1466 enum format_std_version wanted_type_std;
1467 const char *wanted_type_name;
1468 format_wanted_type width_wanted_type;
1469 format_wanted_type precision_wanted_type;
1470 format_wanted_type main_wanted_type;
1471 format_wanted_type *first_wanted_type = NULL;
1472 format_wanted_type *last_wanted_type = NULL;
1473 const format_length_info *fli = NULL;
1474 const format_char_info *fci = NULL;
1475 char flag_chars[256];
1477 const char *format_start = format_chars;
1478 if (*format_chars == 0)
1480 if (format_chars - orig_format_chars != format_length)
1481 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
1482 if (info->first_arg_num != 0 && params != 0
1483 && has_operand_number <= 0)
1485 res->number_other--;
1486 res->number_extra_args++;
1488 if (has_operand_number > 0)
1489 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1492 if (*format_chars++ != '%')
1494 if (*format_chars == 0)
1496 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1499 if (*format_chars == '%')
1506 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1508 /* Possibly read a $ operand number at the start of the format.
1509 If one was previously used, one is required here. If one
1510 is not used here, we can't immediately conclude this is a
1511 format without them, since it could be printf %m or scanf %*. */
1513 opnum = maybe_read_dollar_number (&format_chars, 0,
1515 &main_arg_params, fki);
1520 has_operand_number = 1;
1521 main_arg_num = opnum + info->first_arg_num - 1;
1524 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1526 if (avoid_dollar_number (format_chars))
1530 /* Read any format flags, but do not yet validate them beyond removing
1531 duplicates, since in general validation depends on the rest of
1533 while (*format_chars != 0
1534 && strchr (fki->flag_chars, *format_chars) != 0)
1536 const format_flag_spec *s = get_flag_spec (flag_specs,
1537 *format_chars, NULL);
1538 if (strchr (flag_chars, *format_chars) != 0)
1540 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1544 i = strlen (flag_chars);
1545 flag_chars[i++] = *format_chars;
1548 if (s->skip_next_char)
1551 if (*format_chars == 0)
1553 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1560 /* Read any format width, possibly * or *m$. */
1561 if (fki->width_char != 0)
1563 if (fki->width_type != NULL && *format_chars == '*')
1565 i = strlen (flag_chars);
1566 flag_chars[i++] = fki->width_char;
1568 /* "...a field width...may be indicated by an asterisk.
1569 In this case, an int argument supplies the field width..." */
1571 if (has_operand_number != 0)
1574 opnum = maybe_read_dollar_number (&format_chars,
1575 has_operand_number == 1,
1582 has_operand_number = 1;
1583 arg_num = opnum + info->first_arg_num - 1;
1586 has_operand_number = 0;
1590 if (avoid_dollar_number (format_chars))
1593 if (info->first_arg_num != 0)
1597 warning (OPT_Wformat, "too few arguments for format");
1600 cur_param = TREE_VALUE (params);
1601 if (has_operand_number <= 0)
1603 params = TREE_CHAIN (params);
1606 width_wanted_type.wanted_type = *fki->width_type;
1607 width_wanted_type.wanted_type_name = NULL;
1608 width_wanted_type.pointer_count = 0;
1609 width_wanted_type.char_lenient_flag = 0;
1610 width_wanted_type.writing_in_flag = 0;
1611 width_wanted_type.reading_from_flag = 0;
1612 width_wanted_type.name = _("field width");
1613 width_wanted_type.param = cur_param;
1614 width_wanted_type.arg_num = arg_num;
1615 width_wanted_type.next = NULL;
1616 if (last_wanted_type != 0)
1617 last_wanted_type->next = &width_wanted_type;
1618 if (first_wanted_type == 0)
1619 first_wanted_type = &width_wanted_type;
1620 last_wanted_type = &width_wanted_type;
1625 /* Possibly read a numeric width. If the width is zero,
1626 we complain if appropriate. */
1627 int non_zero_width_char = FALSE;
1628 int found_width = FALSE;
1629 while (ISDIGIT (*format_chars))
1632 if (*format_chars != '0')
1633 non_zero_width_char = TRUE;
1636 if (found_width && !non_zero_width_char &&
1637 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1638 warning (OPT_Wformat, "zero width in %s format", fki->name);
1641 i = strlen (flag_chars);
1642 flag_chars[i++] = fki->width_char;
1648 /* Read any format left precision (must be a number, not *). */
1649 if (fki->left_precision_char != 0 && *format_chars == '#')
1652 i = strlen (flag_chars);
1653 flag_chars[i++] = fki->left_precision_char;
1655 if (!ISDIGIT (*format_chars))
1656 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1657 while (ISDIGIT (*format_chars))
1661 /* Read any format precision, possibly * or *m$. */
1662 if (fki->precision_char != 0 && *format_chars == '.')
1665 i = strlen (flag_chars);
1666 flag_chars[i++] = fki->precision_char;
1668 if (fki->precision_type != NULL && *format_chars == '*')
1670 /* "...a...precision...may be indicated by an asterisk.
1671 In this case, an int argument supplies the...precision." */
1673 if (has_operand_number != 0)
1676 opnum = maybe_read_dollar_number (&format_chars,
1677 has_operand_number == 1,
1684 has_operand_number = 1;
1685 arg_num = opnum + info->first_arg_num - 1;
1688 has_operand_number = 0;
1692 if (avoid_dollar_number (format_chars))
1695 if (info->first_arg_num != 0)
1699 warning (OPT_Wformat, "too few arguments for format");
1702 cur_param = TREE_VALUE (params);
1703 if (has_operand_number <= 0)
1705 params = TREE_CHAIN (params);
1708 precision_wanted_type.wanted_type = *fki->precision_type;
1709 precision_wanted_type.wanted_type_name = NULL;
1710 precision_wanted_type.pointer_count = 0;
1711 precision_wanted_type.char_lenient_flag = 0;
1712 precision_wanted_type.writing_in_flag = 0;
1713 precision_wanted_type.reading_from_flag = 0;
1714 precision_wanted_type.name = _("field precision");
1715 precision_wanted_type.param = cur_param;
1716 precision_wanted_type.arg_num = arg_num;
1717 precision_wanted_type.next = NULL;
1718 if (last_wanted_type != 0)
1719 last_wanted_type->next = &precision_wanted_type;
1720 if (first_wanted_type == 0)
1721 first_wanted_type = &precision_wanted_type;
1722 last_wanted_type = &precision_wanted_type;
1727 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1728 && !ISDIGIT (*format_chars))
1729 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1730 while (ISDIGIT (*format_chars))
1735 /* Read any length modifier, if this kind of format has them. */
1736 fli = fki->length_char_specs;
1737 length_chars = NULL;
1738 length_chars_val = FMT_LEN_none;
1739 length_chars_std = STD_C89;
1742 while (fli->name != 0 && fli->name[0] != *format_chars)
1747 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1750 length_chars = fli->double_name;
1751 length_chars_val = fli->double_index;
1752 length_chars_std = fli->double_std;
1756 length_chars = fli->name;
1757 length_chars_val = fli->index;
1758 length_chars_std = fli->std;
1760 i = strlen (flag_chars);
1761 flag_chars[i++] = fki->length_code_char;
1766 /* Warn if the length modifier is non-standard. */
1767 if (ADJ_STD (length_chars_std) > C_STD_VER)
1768 warning (OPT_Wformat,
1769 "%s does not support the %qs %s length modifier",
1770 C_STD_NAME (length_chars_std), length_chars,
1775 /* Read any modifier (strftime E/O). */
1776 if (fki->modifier_chars != NULL)
1778 while (*format_chars != 0
1779 && strchr (fki->modifier_chars, *format_chars) != 0)
1781 if (strchr (flag_chars, *format_chars) != 0)
1783 const format_flag_spec *s = get_flag_spec (flag_specs,
1784 *format_chars, NULL);
1785 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1789 i = strlen (flag_chars);
1790 flag_chars[i++] = *format_chars;
1797 /* Handle the scanf allocation kludge. */
1798 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1800 if (*format_chars == 'a' && !flag_isoc99)
1802 if (format_chars[1] == 's' || format_chars[1] == 'S'
1803 || format_chars[1] == '[')
1805 /* 'a' is used as a flag. */
1806 i = strlen (flag_chars);
1807 flag_chars[i++] = 'a';
1814 format_char = *format_chars;
1815 if (format_char == 0
1816 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1817 && format_char == '%'))
1819 warning (OPT_Wformat, "conversion lacks type at end of format");
1823 fci = fki->conversion_specs;
1824 while (fci->format_chars != 0
1825 && strchr (fci->format_chars, format_char) == 0)
1827 if (fci->format_chars == 0)
1829 if (ISGRAPH (format_char))
1830 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1833 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1839 if (ADJ_STD (fci->std) > C_STD_VER)
1840 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1841 C_STD_NAME (fci->std), format_char, fki->name);
1844 /* Validate the individual flags used, removing any that are invalid. */
1847 for (i = 0; flag_chars[i] != 0; i++)
1849 const format_flag_spec *s = get_flag_spec (flag_specs,
1850 flag_chars[i], NULL);
1851 flag_chars[i - d] = flag_chars[i];
1852 if (flag_chars[i] == fki->length_code_char)
1854 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1856 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1857 _(s->name), format_char, fki->name);
1863 const format_flag_spec *t;
1864 if (ADJ_STD (s->std) > C_STD_VER)
1865 warning (OPT_Wformat, "%s does not support %s",
1866 C_STD_NAME (s->std), _(s->long_name));
1867 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1868 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1870 const char *long_name = (t->long_name != NULL
1873 if (ADJ_STD (t->std) > C_STD_VER)
1874 warning (OPT_Wformat,
1875 "%s does not support %s with the %<%%%c%> %s format",
1876 C_STD_NAME (t->std), _(long_name),
1877 format_char, fki->name);
1881 flag_chars[i - d] = 0;
1884 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1885 && strchr (flag_chars, 'a') != 0)
1888 if (fki->suppression_char
1889 && strchr (flag_chars, fki->suppression_char) != 0)
1892 /* Validate the pairs of flags used. */
1893 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1895 const format_flag_spec *s, *t;
1896 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1898 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1900 if (bad_flag_pairs[i].predicate != 0
1901 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1903 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1904 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1905 if (bad_flag_pairs[i].ignored)
1907 if (bad_flag_pairs[i].predicate != 0)
1908 warning (OPT_Wformat,
1909 "%s ignored with %s and %<%%%c%> %s format",
1910 _(s->name), _(t->name), format_char,
1913 warning (OPT_Wformat, "%s ignored with %s in %s format",
1914 _(s->name), _(t->name), fki->name);
1918 if (bad_flag_pairs[i].predicate != 0)
1919 warning (OPT_Wformat,
1920 "use of %s and %s together with %<%%%c%> %s format",
1921 _(s->name), _(t->name), format_char,
1924 warning (OPT_Wformat, "use of %s and %s together in %s format",
1925 _(s->name), _(t->name), fki->name);
1929 /* Give Y2K warnings. */
1930 if (warn_format_y2k)
1933 if (strchr (fci->flags2, '4') != 0)
1934 if (strchr (flag_chars, 'E') != 0)
1938 else if (strchr (fci->flags2, '3') != 0)
1940 else if (strchr (fci->flags2, '2') != 0)
1943 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1944 "year in some locales", format_char);
1945 else if (y2k_level == 2)
1946 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1947 "year", format_char);
1950 if (strchr (fci->flags2, '[') != 0)
1952 /* Skip over scan set, in case it happens to have '%' in it. */
1953 if (*format_chars == '^')
1955 /* Find closing bracket; if one is hit immediately, then
1956 it's part of the scan set rather than a terminator. */
1957 if (*format_chars == ']')
1959 while (*format_chars && *format_chars != ']')
1961 if (*format_chars != ']')
1962 /* The end of the format string was reached. */
1963 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
1967 wanted_type_name = 0;
1968 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
1970 wanted_type = (fci->types[length_chars_val].type
1971 ? *fci->types[length_chars_val].type : 0);
1972 wanted_type_name = fci->types[length_chars_val].name;
1973 wanted_type_std = fci->types[length_chars_val].std;
1974 if (wanted_type == 0)
1976 warning (OPT_Wformat,
1977 "use of %qs length modifier with %qc type character",
1978 length_chars, format_char);
1979 /* Heuristic: skip one argument when an invalid length/type
1980 combination is encountered. */
1984 warning (OPT_Wformat, "too few arguments for format");
1987 params = TREE_CHAIN (params);
1991 /* Warn if non-standard, provided it is more non-standard
1992 than the length and type characters that may already
1993 have been warned for. */
1994 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
1995 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
1997 if (ADJ_STD (wanted_type_std) > C_STD_VER)
1998 warning (OPT_Wformat,
1999 "%s does not support the %<%%%s%c%> %s format",
2000 C_STD_NAME (wanted_type_std), length_chars,
2001 format_char, fki->name);
2005 main_wanted_type.next = NULL;
2007 /* Finally. . .check type of argument against desired type! */
2008 if (info->first_arg_num == 0)
2010 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2013 if (main_arg_num != 0)
2016 warning (OPT_Wformat, "operand number specified with "
2017 "suppressed assignment");
2019 warning (OPT_Wformat, "operand number specified for format "
2020 "taking no argument");
2025 format_wanted_type *wanted_type_ptr;
2027 if (main_arg_num != 0)
2029 arg_num = main_arg_num;
2030 params = main_arg_params;
2035 if (has_operand_number > 0)
2037 warning (OPT_Wformat, "missing $ operand number in format");
2041 has_operand_number = 0;
2044 wanted_type_ptr = &main_wanted_type;
2049 warning (OPT_Wformat, "too few arguments for format");
2053 cur_param = TREE_VALUE (params);
2054 params = TREE_CHAIN (params);
2056 wanted_type_ptr->wanted_type = wanted_type;
2057 wanted_type_ptr->wanted_type_name = wanted_type_name;
2058 wanted_type_ptr->pointer_count = fci->pointer_count + aflag;
2059 wanted_type_ptr->char_lenient_flag = 0;
2060 if (strchr (fci->flags2, 'c') != 0)
2061 wanted_type_ptr->char_lenient_flag = 1;
2062 wanted_type_ptr->writing_in_flag = 0;
2063 wanted_type_ptr->reading_from_flag = 0;
2065 wanted_type_ptr->writing_in_flag = 1;
2068 if (strchr (fci->flags2, 'W') != 0)
2069 wanted_type_ptr->writing_in_flag = 1;
2070 if (strchr (fci->flags2, 'R') != 0)
2071 wanted_type_ptr->reading_from_flag = 1;
2073 wanted_type_ptr->name = NULL;
2074 wanted_type_ptr->param = cur_param;
2075 wanted_type_ptr->arg_num = arg_num;
2076 wanted_type_ptr->next = NULL;
2077 if (last_wanted_type != 0)
2078 last_wanted_type->next = wanted_type_ptr;
2079 if (first_wanted_type == 0)
2080 first_wanted_type = wanted_type_ptr;
2081 last_wanted_type = wanted_type_ptr;
2086 wanted_type_ptr = GGC_NEW (format_wanted_type);
2088 wanted_type = *fci->types[length_chars_val].type;
2089 wanted_type_name = fci->types[length_chars_val].name;
2094 if (first_wanted_type != 0)
2095 check_format_types (first_wanted_type, format_start,
2096 format_chars - format_start);
2098 if (main_wanted_type.next != NULL)
2100 format_wanted_type *wanted_type_ptr = main_wanted_type.next;
2101 while (wanted_type_ptr)
2103 format_wanted_type *next = wanted_type_ptr->next;
2104 ggc_free (wanted_type_ptr);
2105 wanted_type_ptr = next;
2112 /* Check the argument types from a single format conversion (possibly
2113 including width and precision arguments). */
2115 check_format_types (format_wanted_type *types, const char *format_start,
2118 for (; types != 0; types = types->next)
2127 cur_param = types->param;
2128 cur_type = TREE_TYPE (cur_param);
2129 if (cur_type == error_mark_node)
2131 orig_cur_type = cur_type;
2133 wanted_type = types->wanted_type;
2134 arg_num = types->arg_num;
2136 /* The following should not occur here. */
2137 gcc_assert (wanted_type);
2138 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2140 if (types->pointer_count == 0)
2141 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2143 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2145 STRIP_NOPS (cur_param);
2147 /* Check the types of any additional pointer arguments
2148 that precede the "real" argument. */
2149 for (i = 0; i < types->pointer_count; ++i)
2151 if (TREE_CODE (cur_type) == POINTER_TYPE)
2153 cur_type = TREE_TYPE (cur_type);
2154 if (cur_type == error_mark_node)
2157 /* Check for writing through a NULL pointer. */
2158 if (types->writing_in_flag
2161 && integer_zerop (cur_param))
2162 warning (OPT_Wformat, "writing through null pointer "
2163 "(argument %d)", arg_num);
2165 /* Check for reading through a NULL pointer. */
2166 if (types->reading_from_flag
2169 && integer_zerop (cur_param))
2170 warning (OPT_Wformat, "reading through null pointer "
2171 "(argument %d)", arg_num);
2173 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2174 cur_param = TREE_OPERAND (cur_param, 0);
2178 /* See if this is an attempt to write into a const type with
2179 scanf or with printf "%n". Note: the writing in happens
2180 at the first indirection only, if for example
2181 void * const * is passed to scanf %p; passing
2182 const void ** is simply passing an incompatible type. */
2183 if (types->writing_in_flag
2185 && (TYPE_READONLY (cur_type)
2187 && (CONSTANT_CLASS_P (cur_param)
2188 || (DECL_P (cur_param)
2189 && TREE_READONLY (cur_param))))))
2190 warning (OPT_Wformat, "writing into constant object "
2191 "(argument %d)", arg_num);
2193 /* If there are extra type qualifiers beyond the first
2194 indirection, then this makes the types technically
2198 && (TYPE_READONLY (cur_type)
2199 || TYPE_VOLATILE (cur_type)
2200 || TYPE_RESTRICT (cur_type)))
2201 warning (OPT_Wformat, "extra type qualifiers in format "
2202 "argument (argument %d)",
2208 format_type_warning (types->name, format_start, format_length,
2209 wanted_type, types->pointer_count,
2210 types->wanted_type_name, orig_cur_type,
2216 if (i < types->pointer_count)
2219 cur_type = TYPE_MAIN_VARIANT (cur_type);
2221 /* Check whether the argument type is a character type. This leniency
2222 only applies to certain formats, flagged with 'c'.
2224 if (types->char_lenient_flag)
2225 char_type_flag = (cur_type == char_type_node
2226 || cur_type == signed_char_type_node
2227 || cur_type == unsigned_char_type_node);
2229 /* Check the type of the "real" argument, if there's a type we want. */
2230 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2232 /* If we want 'void *', allow any pointer type.
2233 (Anything else would already have got a warning.)
2234 With -pedantic, only allow pointers to void and to character
2236 if (wanted_type == void_type_node
2237 && (!pedantic || (i == 1 && char_type_flag)))
2239 /* Don't warn about differences merely in signedness, unless
2240 -pedantic. With -pedantic, warn if the type is a pointer
2241 target and not a character type, and for character types at
2242 a second level of indirection. */
2243 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2244 && TREE_CODE (cur_type) == INTEGER_TYPE
2245 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2246 && (TYPE_UNSIGNED (wanted_type)
2247 ? wanted_type == c_common_unsigned_type (cur_type)
2248 : wanted_type == c_common_signed_type (cur_type)))
2250 /* Likewise, "signed char", "unsigned char" and "char" are
2251 equivalent but the above test won't consider them equivalent. */
2252 if (wanted_type == char_type_node
2253 && (!pedantic || i < 2)
2256 /* Now we have a type mismatch. */
2257 format_type_warning (types->name, format_start, format_length,
2258 wanted_type, types->pointer_count,
2259 types->wanted_type_name, orig_cur_type, arg_num);
2264 /* Give a warning about a format argument of different type from that
2265 expected. DESCR is a description such as "field precision", or
2266 NULL for an ordinary format. For an ordinary format, FORMAT_START
2267 points to where the format starts in the format string and
2268 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2269 should have after POINTER_COUNT pointer dereferences.
2270 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2271 or NULL if the ordinary name of the type should be used. ARG_TYPE
2272 is the type of the actual argument. ARG_NUM is the number of that
2275 format_type_warning (const char *descr, const char *format_start,
2276 int format_length, tree wanted_type, int pointer_count,
2277 const char *wanted_type_name, tree arg_type, int arg_num)
2280 /* If ARG_TYPE is a typedef with a misleading name (for example,
2281 size_t but not the standard size_t expected by printf %zu), avoid
2282 printing the typedef name. */
2283 if (wanted_type_name
2284 && TYPE_NAME (arg_type)
2285 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2286 && DECL_NAME (TYPE_NAME (arg_type))
2287 && !strcmp (wanted_type_name,
2288 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2289 arg_type = TYPE_MAIN_VARIANT (arg_type);
2290 /* The format type and name exclude any '*' for pointers, so those
2291 must be formatted manually. For all the types we currently have,
2292 this is adequate, but formats taking pointers to functions or
2293 arrays would require the full type to be built up in order to
2294 print it with %T. */
2295 p = (char *) alloca (pointer_count + 2);
2296 if (pointer_count == 0)
2298 else if (c_dialect_cxx ())
2300 memset (p, '*', pointer_count);
2301 p[pointer_count] = 0;
2306 memset (p + 1, '*', pointer_count);
2307 p[pointer_count + 1] = 0;
2309 if (wanted_type_name)
2312 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2313 "but argument %d has type %qT",
2314 descr, wanted_type_name, p, arg_num, arg_type);
2316 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2317 "but argument %d has type %qT",
2318 format_length, format_start, wanted_type_name, p,
2324 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2325 "but argument %d has type %qT",
2326 descr, wanted_type, p, arg_num, arg_type);
2328 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2329 "but argument %d has type %qT",
2330 format_length, format_start, wanted_type, p, arg_num, arg_type);
2335 /* Given a format_char_info array FCI, and a character C, this function
2336 returns the index into the conversion_specs where that specifier's
2337 data is located. The character must exist. */
2339 find_char_info_specifier_index (const format_char_info *fci, int c)
2343 for (i = 0; fci->format_chars; i++, fci++)
2344 if (strchr (fci->format_chars, c))
2347 /* We shouldn't be looking for a non-existent specifier. */
2351 /* Given a format_length_info array FLI, and a character C, this
2352 function returns the index into the conversion_specs where that
2353 modifier's data is located. The character must exist. */
2355 find_length_info_modifier_index (const format_length_info *fli, int c)
2359 for (i = 0; fli->name; i++, fli++)
2360 if (strchr (fli->name, c))
2363 /* We shouldn't be looking for a non-existent modifier. */
2367 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2368 use in GCC's __asm_fprintf__ custom format attribute. You must
2369 have set dynamic_format_types before calling this function. */
2371 init_dynamic_asm_fprintf_info (void)
2377 format_length_info *new_asm_fprintf_length_specs;
2380 /* Find the underlying type for HOST_WIDE_INT. For the %w
2381 length modifier to work, one must have issued: "typedef
2382 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2383 prior to using that modifier. */
2384 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2387 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2390 hwi = identifier_global_value (hwi);
2391 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2393 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2396 hwi = DECL_ORIGINAL_TYPE (hwi);
2398 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2400 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2401 " or %<long long%>");
2405 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2406 new_asm_fprintf_length_specs = (format_length_info *)
2407 xmemdup (asm_fprintf_length_specs,
2408 sizeof (asm_fprintf_length_specs),
2409 sizeof (asm_fprintf_length_specs));
2411 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2412 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2413 if (hwi == long_integer_type_node)
2414 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2415 else if (hwi == long_long_integer_type_node)
2416 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2420 /* Assign the new data for use. */
2421 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2422 new_asm_fprintf_length_specs;
2426 /* Determine the type of a "locus" in the code being compiled for use
2427 in GCC's __gcc_gfc__ custom format attribute. You must have set
2428 dynamic_format_types before calling this function. */
2430 init_dynamic_gfc_info (void)
2436 static format_char_info *gfc_fci;
2438 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2439 must have declared 'locus' prior to using this attribute. If
2440 we haven't seen this declarations then you shouldn't use the
2441 specifier requiring that type. */
2442 if ((locus = maybe_get_identifier ("locus")))
2444 locus = identifier_global_value (locus);
2447 if (TREE_CODE (locus) != TYPE_DECL)
2449 error ("%<locus%> is not defined as a type");
2453 locus = TREE_TYPE (locus);
2457 /* Assign the new data for use. */
2459 /* Handle the __gcc_gfc__ format specifics. */
2461 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2462 gfc_fci = (format_char_info *)
2463 xmemdup (gcc_gfc_char_table,
2464 sizeof (gcc_gfc_char_table),
2465 sizeof (gcc_gfc_char_table));
2468 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2469 gfc_fci[i].types[0].type = &locus;
2470 gfc_fci[i].pointer_count = 1;
2475 /* Determine the types of "tree" and "location_t" in the code being
2476 compiled for use in GCC's diagnostic custom format attributes. You
2477 must have set dynamic_format_types before calling this function. */
2479 init_dynamic_diag_info (void)
2481 static tree t, loc, hwi;
2483 if (!loc || !t || !hwi)
2485 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2486 static format_length_info *diag_ls;
2489 /* For the GCC-diagnostics custom format specifiers to work, one
2490 must have declared 'tree' and/or 'location_t' prior to using
2491 those attributes. If we haven't seen these declarations then
2492 you shouldn't use the specifiers requiring these types.
2493 However we don't force a hard ICE because we may see only one
2494 or the other type. */
2495 if ((loc = maybe_get_identifier ("location_t")))
2497 loc = identifier_global_value (loc);
2500 if (TREE_CODE (loc) != TYPE_DECL)
2502 error ("%<location_t%> is not defined as a type");
2506 loc = TREE_TYPE (loc);
2510 /* We need to grab the underlying 'union tree_node' so peek into
2511 an extra type level. */
2512 if ((t = maybe_get_identifier ("tree")))
2514 t = identifier_global_value (t);
2517 if (TREE_CODE (t) != TYPE_DECL)
2519 error ("%<tree%> is not defined as a type");
2522 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2524 error ("%<tree%> is not defined as a pointer type");
2528 t = TREE_TYPE (TREE_TYPE (t));
2532 /* Find the underlying type for HOST_WIDE_INT. For the %w
2533 length modifier to work, one must have issued: "typedef
2534 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2535 prior to using that modifier. */
2536 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2538 hwi = identifier_global_value (hwi);
2541 if (TREE_CODE (hwi) != TYPE_DECL)
2543 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2548 hwi = DECL_ORIGINAL_TYPE (hwi);
2550 if (hwi != long_integer_type_node
2551 && hwi != long_long_integer_type_node)
2553 error ("%<__gcc_host_wide_int__%> is not defined"
2554 " as %<long%> or %<long long%>");
2561 /* Assign the new data for use. */
2563 /* All the GCC diag formats use the same length specs. */
2565 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2566 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2567 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2568 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2569 diag_ls = (format_length_info *)
2570 xmemdup (gcc_diag_length_specs,
2571 sizeof (gcc_diag_length_specs),
2572 sizeof (gcc_diag_length_specs));
2575 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2576 i = find_length_info_modifier_index (diag_ls, 'w');
2577 if (hwi == long_integer_type_node)
2578 diag_ls[i].index = FMT_LEN_l;
2579 else if (hwi == long_long_integer_type_node)
2580 diag_ls[i].index = FMT_LEN_ll;
2585 /* Handle the __gcc_diag__ format specifics. */
2587 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2588 diag_fci = (format_char_info *)
2589 xmemdup (gcc_diag_char_table,
2590 sizeof (gcc_diag_char_table),
2591 sizeof (gcc_diag_char_table));
2594 i = find_char_info_specifier_index (diag_fci, 'H');
2595 diag_fci[i].types[0].type = &loc;
2596 diag_fci[i].pointer_count = 1;
2600 i = find_char_info_specifier_index (diag_fci, 'J');
2601 diag_fci[i].types[0].type = &t;
2602 diag_fci[i].pointer_count = 1;
2605 /* Handle the __gcc_tdiag__ format specifics. */
2607 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2608 tdiag_fci = (format_char_info *)
2609 xmemdup (gcc_tdiag_char_table,
2610 sizeof (gcc_tdiag_char_table),
2611 sizeof (gcc_tdiag_char_table));
2614 i = find_char_info_specifier_index (tdiag_fci, 'H');
2615 tdiag_fci[i].types[0].type = &loc;
2616 tdiag_fci[i].pointer_count = 1;
2620 /* All specifiers taking a tree share the same struct. */
2621 i = find_char_info_specifier_index (tdiag_fci, 'D');
2622 tdiag_fci[i].types[0].type = &t;
2623 tdiag_fci[i].pointer_count = 1;
2624 i = find_char_info_specifier_index (tdiag_fci, 'J');
2625 tdiag_fci[i].types[0].type = &t;
2626 tdiag_fci[i].pointer_count = 1;
2629 /* Handle the __gcc_cdiag__ format specifics. */
2631 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2632 cdiag_fci = (format_char_info *)
2633 xmemdup (gcc_cdiag_char_table,
2634 sizeof (gcc_cdiag_char_table),
2635 sizeof (gcc_cdiag_char_table));
2638 i = find_char_info_specifier_index (cdiag_fci, 'H');
2639 cdiag_fci[i].types[0].type = &loc;
2640 cdiag_fci[i].pointer_count = 1;
2644 /* All specifiers taking a tree share the same struct. */
2645 i = find_char_info_specifier_index (cdiag_fci, 'D');
2646 cdiag_fci[i].types[0].type = &t;
2647 cdiag_fci[i].pointer_count = 1;
2648 i = find_char_info_specifier_index (cdiag_fci, 'J');
2649 cdiag_fci[i].types[0].type = &t;
2650 cdiag_fci[i].pointer_count = 1;
2653 /* Handle the __gcc_cxxdiag__ format specifics. */
2655 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2656 cxxdiag_fci = (format_char_info *)
2657 xmemdup (gcc_cxxdiag_char_table,
2658 sizeof (gcc_cxxdiag_char_table),
2659 sizeof (gcc_cxxdiag_char_table));
2662 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2663 cxxdiag_fci[i].types[0].type = &loc;
2664 cxxdiag_fci[i].pointer_count = 1;
2668 /* All specifiers taking a tree share the same struct. */
2669 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2670 cxxdiag_fci[i].types[0].type = &t;
2671 cxxdiag_fci[i].pointer_count = 1;
2672 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2673 cxxdiag_fci[i].types[0].type = &t;
2674 cxxdiag_fci[i].pointer_count = 1;
2679 #ifdef TARGET_FORMAT_TYPES
2680 extern const format_kind_info TARGET_FORMAT_TYPES[];
2683 /* Handle a "format" attribute; arguments as in
2684 struct attribute_spec.handler. */
2686 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2687 int flags, bool *no_add_attrs)
2690 function_format_info info;
2693 #ifdef TARGET_FORMAT_TYPES
2694 /* If the target provides additional format types, we need to
2695 add them to FORMAT_TYPES at first use. */
2696 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2698 dynamic_format_types = xmalloc ((n_format_types + TARGET_N_FORMAT_TYPES)
2699 * sizeof (dynamic_format_types[0]));
2700 memcpy (dynamic_format_types, format_types_orig,
2701 sizeof (format_types_orig));
2702 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2703 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2705 format_types = dynamic_format_types;
2706 n_format_types += TARGET_N_FORMAT_TYPES;
2710 if (!decode_format_attr (args, &info, 0))
2712 *no_add_attrs = true;
2716 argument = TYPE_ARG_TYPES (type);
2719 if (!check_format_string (argument, info.format_num, flags,
2723 if (info.first_arg_num != 0)
2725 unsigned HOST_WIDE_INT arg_num = 1;
2727 /* Verify that first_arg_num points to the last arg,
2730 arg_num++, argument = TREE_CHAIN (argument);
2732 if (arg_num != info.first_arg_num)
2734 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2735 error ("args to be formatted is not %<...%>");
2736 *no_add_attrs = true;
2742 if (info.format_type == strftime_format_type && info.first_arg_num != 0)
2744 error ("strftime formats cannot format arguments");
2745 *no_add_attrs = true;
2749 /* If this is a custom GCC-internal format type, we have to
2750 initialize certain bits a runtime. */
2751 if (info.format_type == asm_fprintf_format_type
2752 || info.format_type == gcc_gfc_format_type
2753 || info.format_type == gcc_diag_format_type
2754 || info.format_type == gcc_tdiag_format_type
2755 || info.format_type == gcc_cdiag_format_type
2756 || info.format_type == gcc_cxxdiag_format_type)
2758 /* Our first time through, we have to make sure that our
2759 format_type data is allocated dynamically and is modifiable. */
2760 if (!dynamic_format_types)
2761 format_types = dynamic_format_types = (format_kind_info *)
2762 xmemdup (format_types_orig, sizeof (format_types_orig),
2763 sizeof (format_types_orig));
2765 /* If this is format __asm_fprintf__, we have to initialize
2766 GCC's notion of HOST_WIDE_INT for checking %wd. */
2767 if (info.format_type == asm_fprintf_format_type)
2768 init_dynamic_asm_fprintf_info ();
2769 /* If this is format __gcc_gfc__, we have to initialize GCC's
2770 notion of 'locus' at runtime for %L. */
2771 else if (info.format_type == gcc_gfc_format_type)
2772 init_dynamic_gfc_info ();
2773 /* If this is one of the diagnostic attributes, then we have to
2774 initialize 'location_t' and 'tree' at runtime. */
2775 else if (info.format_type == gcc_diag_format_type
2776 || info.format_type == gcc_tdiag_format_type
2777 || info.format_type == gcc_cdiag_format_type
2778 || info.format_type == gcc_cxxdiag_format_type)
2779 init_dynamic_diag_info ();