1 /* Check calls to formatted I/O functions (-Wformat).
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
30 #include "diagnostic.h"
31 #include "langhooks.h"
33 #include "alloc-pool.h"
35 /* Set format warning options according to a -Wformat=n option. */
38 set_Wformat (int setting)
40 warn_format = setting;
41 warn_format_extra_args = setting;
42 warn_format_zero_length = setting;
43 warn_format_contains_nul = setting;
46 warn_format_nonliteral = setting;
47 warn_format_security = setting;
48 warn_format_y2k = setting;
50 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */
52 warn_nonnull = setting;
56 /* Handle attributes associated with format checking. */
58 /* This must be in the same order as format_types, except for
59 format_type_error. Target-specific format types do not have
60 matching enum values. */
61 enum format_type { printf_format_type, asm_fprintf_format_type,
62 gcc_diag_format_type, gcc_tdiag_format_type,
63 gcc_cdiag_format_type,
64 gcc_cxxdiag_format_type, gcc_gfc_format_type,
65 format_type_error = -1};
67 typedef struct function_format_info
69 int format_type; /* type of format (printf, scanf, etc.) */
70 unsigned HOST_WIDE_INT format_num; /* number of format argument */
71 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */
72 } function_format_info;
74 static bool decode_format_attr (tree, function_format_info *, int);
75 static int decode_format_type (const char *);
77 static bool check_format_string (tree argument,
78 unsigned HOST_WIDE_INT format_num,
79 int flags, bool *no_add_attrs);
80 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
82 static const char *convert_format_name_to_system_name (const char *attr_name);
83 static bool cmp_attribs (const char *tattr_name, const char *attr_name);
85 /* Handle a "format_arg" attribute; arguments as in
86 struct attribute_spec.handler. */
88 handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
89 tree args, int flags, bool *no_add_attrs)
92 tree format_num_expr = TREE_VALUE (args);
93 unsigned HOST_WIDE_INT format_num = 0;
96 if (!get_constant (format_num_expr, &format_num, 0))
98 error ("format string has invalid operand number");
103 argument = TYPE_ARG_TYPES (type);
106 if (!check_format_string (argument, format_num, flags, no_add_attrs))
110 if (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
111 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
114 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
115 error ("function does not return string type");
116 *no_add_attrs = true;
123 /* Verify that the format_num argument is actually a string, in case
124 the format attribute is in error. */
126 check_format_string (tree argument, unsigned HOST_WIDE_INT format_num,
127 int flags, bool *no_add_attrs)
129 unsigned HOST_WIDE_INT i;
131 for (i = 1; i != format_num; i++)
135 argument = TREE_CHAIN (argument);
139 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
140 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
143 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
144 error ("format string argument not a string type");
145 *no_add_attrs = true;
152 /* Verify EXPR is a constant, and store its value.
153 If validated_p is true there should be no errors.
154 Returns true on success, false otherwise. */
156 get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
158 if (TREE_CODE (expr) != INTEGER_CST || TREE_INT_CST_HIGH (expr) != 0)
160 gcc_assert (!validated_p);
164 *value = TREE_INT_CST_LOW (expr);
169 /* Decode the arguments to a "format" attribute into a
170 function_format_info structure. It is already known that the list
171 is of the right length. If VALIDATED_P is true, then these
172 attributes have already been validated and must not be erroneous;
173 if false, it will give an error message. Returns true if the
174 attributes are successfully decoded, false otherwise. */
177 decode_format_attr (tree args, function_format_info *info, int validated_p)
179 tree format_type_id = TREE_VALUE (args);
180 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
181 tree first_arg_num_expr
182 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
184 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
186 gcc_assert (!validated_p);
187 error ("unrecognized format specifier");
192 const char *p = IDENTIFIER_POINTER (format_type_id);
194 p = convert_format_name_to_system_name (p);
196 info->format_type = decode_format_type (p);
198 if (info->format_type == format_type_error)
200 gcc_assert (!validated_p);
201 warning (OPT_Wformat, "%qE is an unrecognized format function type",
207 if (!get_constant (format_num_expr, &info->format_num, validated_p))
209 error ("format string has invalid operand number");
213 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
215 error ("%<...%> has invalid operand number");
219 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
221 gcc_assert (!validated_p);
222 error ("format string argument follows the args to be formatted");
229 /* Check a call to a format function against a parameter list. */
231 /* The C standard version C++ is treated as equivalent to
232 or inheriting from, for the purpose of format features supported. */
233 #define CPLUSPLUS_STD_VER STD_C94
234 /* The C standard version we are checking formats against when pedantic. */
235 #define C_STD_VER ((int) (c_dialect_cxx () \
236 ? CPLUSPLUS_STD_VER \
239 : (flag_isoc94 ? STD_C94 : STD_C89))))
240 /* The name to give to the standard version we are warning about when
241 pedantic. FEATURE_VER is the version in which the feature warned out
242 appeared, which is higher than C_STD_VER. */
243 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
245 : ((FEATURE_VER) == STD_EXT \
248 /* Adjust a C standard version, which may be STD_C9L, to account for
249 -Wno-long-long. Returns other standard versions unchanged. */
250 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
251 ? (warn_long_long ? STD_C99 : STD_C89) \
254 /* Structure describing details of a type expected in format checking,
255 and the type to check against it. */
256 typedef struct format_wanted_type
258 /* The type wanted. */
260 /* The name of this type to use in diagnostics. */
261 const char *wanted_type_name;
262 /* The level of indirection through pointers at which this type occurs. */
264 /* Whether, when pointer_count is 1, to allow any character type when
265 pedantic, rather than just the character or void type specified. */
266 int char_lenient_flag;
267 /* Whether the argument, dereferenced once, is written into and so the
268 argument must not be a pointer to a const-qualified type. */
270 /* Whether the argument, dereferenced once, is read from and so
271 must not be a NULL pointer. */
272 int reading_from_flag;
273 /* If warnings should be of the form "field precision should have
274 type 'int'", the name to use (in this case "field precision"),
275 otherwise NULL, for "format expects type 'long'" type
278 /* The actual parameter to check against the wanted type. */
280 /* The argument number of that parameter. */
282 /* The next type to check for this format conversion, or NULL if none. */
283 struct format_wanted_type *next;
284 } format_wanted_type;
286 /* Convenience macro for format_length_info meaning unused. */
287 #define NO_FMT NULL, FMT_LEN_none, STD_C89
289 static const format_length_info printf_length_specs[] =
291 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
292 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
293 { "q", FMT_LEN_ll, STD_EXT, NO_FMT },
294 { "L", FMT_LEN_L, STD_C89, NO_FMT },
295 { "z", FMT_LEN_z, STD_C99, NO_FMT },
296 { "Z", FMT_LEN_z, STD_EXT, NO_FMT },
297 { "t", FMT_LEN_t, STD_C99, NO_FMT },
298 { "j", FMT_LEN_j, STD_C99, NO_FMT },
299 { "H", FMT_LEN_H, STD_EXT, NO_FMT },
300 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
304 /* Length specifiers valid for asm_fprintf. */
305 static const format_length_info asm_fprintf_length_specs[] =
307 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
308 { "w", FMT_LEN_none, STD_C89, NO_FMT },
312 /* Length specifiers valid for GCC diagnostics. */
313 static const format_length_info gcc_diag_length_specs[] =
315 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
316 { "w", FMT_LEN_none, STD_C89, NO_FMT },
320 /* The custom diagnostics all accept the same length specifiers. */
321 #define gcc_tdiag_length_specs gcc_diag_length_specs
322 #define gcc_cdiag_length_specs gcc_diag_length_specs
323 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
325 /* This differs from printf_length_specs only in that "Z" is not accepted. */
326 static const format_length_info scanf_length_specs[] =
328 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
329 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
330 { "q", FMT_LEN_ll, STD_EXT, NO_FMT },
331 { "L", FMT_LEN_L, STD_C89, NO_FMT },
332 { "z", FMT_LEN_z, STD_C99, NO_FMT },
333 { "t", FMT_LEN_t, STD_C99, NO_FMT },
334 { "j", FMT_LEN_j, STD_C99, NO_FMT },
335 { "H", FMT_LEN_H, STD_EXT, NO_FMT },
336 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
341 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
342 make no sense for a format type not part of any C standard version. */
343 static const format_length_info strfmon_length_specs[] =
345 /* A GNU extension. */
346 { "L", FMT_LEN_L, STD_C89, NO_FMT },
351 /* For now, the Fortran front-end routines only use l as length modifier. */
352 static const format_length_info gcc_gfc_length_specs[] =
354 { "l", FMT_LEN_l, STD_C89, NO_FMT },
359 static const format_flag_spec printf_flag_specs[] =
361 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
362 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
363 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
364 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
365 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
366 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
367 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
368 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
369 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
370 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
371 { 0, 0, 0, NULL, NULL, STD_C89 }
375 static const format_flag_pair printf_flag_pairs[] =
379 { '0', 'p', 1, 'i' },
383 static const format_flag_spec asm_fprintf_flag_specs[] =
385 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
386 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
387 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
388 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
389 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
390 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
391 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
392 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
393 { 0, 0, 0, NULL, NULL, STD_C89 }
396 static const format_flag_pair asm_fprintf_flag_pairs[] =
400 { '0', 'p', 1, 'i' },
404 static const format_flag_pair gcc_diag_flag_pairs[] =
409 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
410 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
411 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
413 static const format_flag_pair gcc_gfc_flag_pairs[] =
418 static const format_flag_spec gcc_diag_flag_specs[] =
420 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
421 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
422 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
423 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
424 { 0, 0, 0, NULL, NULL, STD_C89 }
427 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
428 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
430 static const format_flag_spec gcc_cxxdiag_flag_specs[] =
432 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
433 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
434 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
435 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
436 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
437 { 0, 0, 0, NULL, NULL, STD_C89 }
440 static const format_flag_spec scanf_flag_specs[] =
442 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
443 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
444 { 'm', 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT },
445 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
446 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
447 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
448 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
449 { 0, 0, 0, NULL, NULL, STD_C89 }
453 static const format_flag_pair scanf_flag_pairs[] =
461 static const format_flag_spec strftime_flag_specs[] =
463 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
464 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
465 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
466 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
467 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
468 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
469 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
470 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
471 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
472 { 0, 0, 0, NULL, NULL, STD_C89 }
476 static const format_flag_pair strftime_flag_pairs[] =
487 static const format_flag_spec strfmon_flag_specs[] =
489 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
490 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
491 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
492 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
493 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
494 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
495 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
496 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
497 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
498 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
499 { 0, 0, 0, NULL, NULL, STD_C89 }
502 static const format_flag_pair strfmon_flag_pairs[] =
508 static const format_char_info dfly_ext_char_info =
509 { NULL, 1, STD_EXT, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL };
511 static const format_char_info print_char_table[] =
513 /* C89 conversion specifiers. */
514 { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "-wp0 +'I", "i", NULL },
515 { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
516 { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "-wp0'I", "i", NULL },
517 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#'I", "", NULL },
518 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#I", "", NULL },
519 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
520 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
521 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
522 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "", "W", NULL },
523 /* C99 conversion specifiers. */
524 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#'I", "", NULL },
525 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
526 /* X/Open conversion specifiers. */
527 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
528 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
529 /* GNU conversion specifiers. */
530 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
531 /* BSD conversion specifiers. */
532 /* DragonFly kernel extensions (src/sys/kern/subr_prf.c).
533 The format %b is supported to decode error registers.
534 Its usage is: printf("reg=%b\n", regval, "<base><arg>*");
535 which produces: reg=3<BITTWO,BITONE>
536 The format %D provides a hexdump given a pointer and separator string:
537 ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
538 ("%*D", len, ptr, " ") -> XX XX XX XX ...
540 { "D", 1, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", &dfly_ext_char_info },
541 { "b", 0, STD_EXT, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", &dfly_ext_char_info },
542 { "ry", 0, STD_EXT, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "i", NULL },
543 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
546 static const format_char_info asm_fprintf_char_table[] =
548 /* C89 conversion specifiers. */
549 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
550 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
551 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
552 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
553 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
555 /* asm_fprintf conversion specifiers. */
556 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
557 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
558 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
559 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
560 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
561 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
562 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
563 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
566 static const format_char_info gcc_diag_char_table[] =
568 /* C89 conversion specifiers. */
569 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
570 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
571 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
572 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
573 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
574 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
576 /* Custom conversion specifiers. */
578 /* %H will require "location_t" at runtime. */
579 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
581 /* These will require a "tree" at runtime. */
582 { "JK", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
584 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
585 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
586 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
589 static const format_char_info gcc_tdiag_char_table[] =
591 /* C89 conversion specifiers. */
592 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
593 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
594 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
595 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
596 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
597 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
599 /* Custom conversion specifiers. */
601 /* %H will require "location_t" at runtime. */
602 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
604 /* These will require a "tree" at runtime. */
605 { "DFJKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
607 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
608 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
609 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
612 static const format_char_info gcc_cdiag_char_table[] =
614 /* C89 conversion specifiers. */
615 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
616 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
617 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
618 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
619 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
620 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
622 /* Custom conversion specifiers. */
624 /* %H will require "location_t" at runtime. */
625 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
627 /* These will require a "tree" at runtime. */
628 { "DEFJKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
630 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
631 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
632 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
635 static const format_char_info gcc_cxxdiag_char_table[] =
637 /* C89 conversion specifiers. */
638 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
639 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
640 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
641 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
642 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
643 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
645 /* Custom conversion specifiers. */
647 /* %H will require "location_t" at runtime. */
648 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
650 /* These will require a "tree" at runtime. */
651 { "ADEFJKTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
653 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
654 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
656 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
657 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
658 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
661 static const format_char_info gcc_gfc_char_table[] =
663 /* C89 conversion specifiers. */
664 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
665 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
666 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
667 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
669 /* gfc conversion specifiers. */
671 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
673 /* This will require a "locus" at runtime. */
674 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
676 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
679 static const format_char_info scan_char_table[] =
681 /* C89 conversion specifiers. */
682 { "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 },
683 { "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 },
684 { "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 },
685 { "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 },
686 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL },
687 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL },
688 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL },
689 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
690 { "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 },
691 /* C99 conversion specifiers. */
692 { "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 },
693 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
694 /* X/Open conversion specifiers. */
695 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL },
696 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL },
697 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
700 static const format_char_info time_char_table[] =
702 /* C89 conversion specifiers. */
703 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
704 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
705 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
706 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
707 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
708 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
709 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
710 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
711 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
712 /* C99 conversion specifiers. */
713 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
714 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
715 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
716 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
717 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
718 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
719 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
720 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
721 /* GNU conversion specifiers. */
722 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
723 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
724 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
727 static const format_char_info monetary_char_table[] =
729 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
730 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
733 /* This must be in the same order as enum format_type. */
734 static const format_kind_info format_types_orig[] =
736 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
737 printf_flag_specs, printf_flag_pairs,
738 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
739 'w', 0, 'p', 0, 'L', 0,
740 &integer_type_node, &integer_type_node
742 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
743 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
744 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
745 'w', 0, 'p', 0, 'L', 0,
748 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
749 gcc_diag_flag_specs, gcc_diag_flag_pairs,
750 FMT_FLAG_ARG_CONVERT,
751 0, 0, 'p', 0, 'L', 0,
752 NULL, &integer_type_node
754 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
755 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
756 FMT_FLAG_ARG_CONVERT,
757 0, 0, 'p', 0, 'L', 0,
758 NULL, &integer_type_node
760 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
761 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
762 FMT_FLAG_ARG_CONVERT,
763 0, 0, 'p', 0, 'L', 0,
764 NULL, &integer_type_node
766 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
767 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
768 FMT_FLAG_ARG_CONVERT,
769 0, 0, 'p', 0, 'L', 0,
770 NULL, &integer_type_node
772 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL,
773 NULL, gcc_gfc_flag_pairs,
774 FMT_FLAG_ARG_CONVERT,
778 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
779 scanf_flag_specs, scanf_flag_pairs,
780 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
781 'w', 0, 0, '*', 'L', 'm',
784 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
785 strftime_flag_specs, strftime_flag_pairs,
786 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
789 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
790 strfmon_flag_specs, strfmon_flag_pairs,
791 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
796 /* This layer of indirection allows GCC to reassign format_types with
797 new data if necessary, while still allowing the original data to be
799 static const format_kind_info *format_types = format_types_orig;
800 /* We can modify this one. We also add target-specific format types
801 to the end of the array. */
802 static format_kind_info *dynamic_format_types;
804 static int n_format_types = ARRAY_SIZE (format_types_orig);
806 /* Structure detailing the results of checking a format function call
807 where the format expression may be a conditional expression with
808 many leaves resulting from nested conditional expressions. */
811 /* Number of leaves of the format argument that could not be checked
812 as they were not string literals. */
813 int number_non_literal;
814 /* Number of leaves of the format argument that were null pointers or
815 string literals, but had extra format arguments. */
816 int number_extra_args;
817 /* Number of leaves of the format argument that were null pointers or
818 string literals, but had extra format arguments and used $ operand
820 int number_dollar_extra_args;
821 /* Number of leaves of the format argument that were wide string
824 /* Number of leaves of the format argument that were empty strings. */
826 /* Number of leaves of the format argument that were unterminated
828 int number_unterminated;
829 /* Number of leaves of the format argument that were not counted above. */
831 } format_check_results;
835 format_check_results *res;
836 function_format_info *info;
838 } format_check_context;
840 static void check_format_info (function_format_info *, tree);
841 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
842 static void check_format_info_main (format_check_results *,
843 function_format_info *,
844 const char *, int, tree,
845 unsigned HOST_WIDE_INT, alloc_pool);
847 static void init_dollar_format_checking (int, tree);
848 static int maybe_read_dollar_number (const char **, int,
849 tree, tree *, const format_kind_info *);
850 static bool avoid_dollar_number (const char *);
851 static void finish_dollar_format_checking (format_check_results *, int);
853 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
856 static void check_format_types (format_wanted_type *, const char *, int);
857 static void format_type_warning (const char *, const char *, int, tree,
858 int, const char *, tree, int);
860 /* Decode a format type from a string, returning the type, or
861 format_type_error if not valid, in which case the caller should print an
864 decode_format_type (const char *s)
869 s = convert_format_name_to_system_name (s);
871 for (i = 0; i < n_format_types; i++)
874 if (!strcmp (s, format_types[i].name))
876 alen = strlen (format_types[i].name);
877 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
878 && s[slen - 1] == '_' && s[slen - 2] == '_'
879 && !strncmp (s + 2, format_types[i].name, alen))
882 return format_type_error;
886 /* Check the argument list of a call to printf, scanf, etc.
887 ATTRS are the attributes on the function type. There are NARGS argument
888 values in the array ARGARRAY.
889 Also, if -Wmissing-format-attribute,
890 warn for calls to vprintf or vscanf in functions with no such format
891 attribute themselves. */
894 check_function_format (tree attrs, int nargs, tree *argarray)
898 /* See if this function has any format attributes. */
899 for (a = attrs; a; a = TREE_CHAIN (a))
901 if (is_attribute_p ("format", TREE_PURPOSE (a)))
904 function_format_info info;
905 decode_format_attr (TREE_VALUE (a), &info, 1);
908 /* FIXME: Rewrite all the internal functions in this file
909 to use the ARGARRAY directly instead of constructing this
911 tree params = NULL_TREE;
913 for (i = nargs - 1; i >= 0; i--)
914 params = tree_cons (NULL_TREE, argarray[i], params);
915 check_format_info (&info, params);
917 if (warn_missing_format_attribute && info.first_arg_num == 0
918 && (format_types[info.format_type].flags
919 & (int) FMT_FLAG_ARG_CONVERT))
922 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
925 if (is_attribute_p ("format", TREE_PURPOSE (c))
926 && (decode_format_type (IDENTIFIER_POINTER
927 (TREE_VALUE (TREE_VALUE (c))))
928 == info.format_type))
932 /* Check if the current function has a parameter to which
933 the format attribute could be attached; if not, it
934 can't be a candidate for a format attribute, despite
935 the vprintf-like or vscanf-like call. */
937 for (args = DECL_ARGUMENTS (current_function_decl);
939 args = TREE_CHAIN (args))
941 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
942 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
947 warning (OPT_Wmissing_format_attribute, "function might "
948 "be possible candidate for %qs format attribute",
949 format_types[info.format_type].name);
957 /* Variables used by the checking of $ operand number formats. */
958 static char *dollar_arguments_used = NULL;
959 static char *dollar_arguments_pointer_p = NULL;
960 static int dollar_arguments_alloc = 0;
961 static int dollar_arguments_count;
962 static int dollar_first_arg_num;
963 static int dollar_max_arg_used;
964 static int dollar_format_warned;
966 /* Initialize the checking for a format string that may contain $
967 parameter number specifications; we will need to keep track of whether
968 each parameter has been used. FIRST_ARG_NUM is the number of the first
969 argument that is a parameter to the format, or 0 for a vprintf-style
970 function; PARAMS is the list of arguments starting at this argument. */
973 init_dollar_format_checking (int first_arg_num, tree params)
975 tree oparams = params;
977 dollar_first_arg_num = first_arg_num;
978 dollar_arguments_count = 0;
979 dollar_max_arg_used = 0;
980 dollar_format_warned = 0;
981 if (first_arg_num > 0)
985 dollar_arguments_count++;
986 params = TREE_CHAIN (params);
989 if (dollar_arguments_alloc < dollar_arguments_count)
991 if (dollar_arguments_used)
992 free (dollar_arguments_used);
993 if (dollar_arguments_pointer_p)
994 free (dollar_arguments_pointer_p);
995 dollar_arguments_alloc = dollar_arguments_count;
996 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
997 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
999 if (dollar_arguments_alloc)
1001 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1002 if (first_arg_num > 0)
1008 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1010 params = TREE_CHAIN (params);
1018 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1019 is set, it is an error if one is not found; otherwise, it is OK. If
1020 such a number is found, check whether it is within range and mark that
1021 numbered operand as being used for later checking. Returns the operand
1022 number if found and within range, zero if no such number was found and
1023 this is OK, or -1 on error. PARAMS points to the first operand of the
1024 format; PARAM_PTR is made to point to the parameter referred to. If
1025 a $ format is found, *FORMAT is updated to point just after it. */
1028 maybe_read_dollar_number (const char **format,
1029 int dollar_needed, tree params, tree *param_ptr,
1030 const format_kind_info *fki)
1034 const char *fcp = *format;
1035 if (!ISDIGIT (*fcp))
1039 warning (OPT_Wformat, "missing $ operand number in format");
1047 while (ISDIGIT (*fcp))
1050 nargnum = 10 * argnum + (*fcp - '0');
1051 if (nargnum < 0 || nargnum / 10 != argnum)
1060 warning (OPT_Wformat, "missing $ operand number in format");
1067 if (pedantic && !dollar_format_warned)
1069 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1070 C_STD_NAME (STD_EXT));
1071 dollar_format_warned = 1;
1073 if (overflow_flag || argnum == 0
1074 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1076 warning (OPT_Wformat, "operand number out of range in format");
1079 if (argnum > dollar_max_arg_used)
1080 dollar_max_arg_used = argnum;
1081 /* For vprintf-style functions we may need to allocate more memory to
1082 track which arguments are used. */
1083 while (dollar_arguments_alloc < dollar_max_arg_used)
1086 nalloc = 2 * dollar_arguments_alloc + 16;
1087 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1089 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1091 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1092 nalloc - dollar_arguments_alloc);
1093 dollar_arguments_alloc = nalloc;
1095 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1096 && dollar_arguments_used[argnum - 1] == 1)
1098 dollar_arguments_used[argnum - 1] = 2;
1099 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1103 dollar_arguments_used[argnum - 1] = 1;
1104 if (dollar_first_arg_num)
1107 *param_ptr = params;
1108 for (i = 1; i < argnum && *param_ptr != 0; i++)
1109 *param_ptr = TREE_CHAIN (*param_ptr);
1111 /* This case shouldn't be caught here. */
1112 gcc_assert (*param_ptr);
1119 /* Ensure that FORMAT does not start with a decimal number followed by
1120 a $; give a diagnostic and return true if it does, false otherwise. */
1123 avoid_dollar_number (const char *format)
1125 if (!ISDIGIT (*format))
1127 while (ISDIGIT (*format))
1131 warning (OPT_Wformat, "$ operand number used after format without operand number");
1138 /* Finish the checking for a format string that used $ operand number formats
1139 instead of non-$ formats. We check for unused operands before used ones
1140 (a serious error, since the implementation of the format function
1141 can't know what types to pass to va_arg to find the later arguments).
1142 and for unused operands at the end of the format (if we know how many
1143 arguments the format had, so not for vprintf). If there were operand
1144 numbers out of range on a non-vprintf-style format, we won't have reached
1145 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1149 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1152 bool found_pointer_gap = false;
1153 for (i = 0; i < dollar_max_arg_used; i++)
1155 if (!dollar_arguments_used[i])
1157 if (pointer_gap_ok && (dollar_first_arg_num == 0
1158 || dollar_arguments_pointer_p[i]))
1159 found_pointer_gap = true;
1161 warning (OPT_Wformat,
1162 "format argument %d unused before used argument %d in $-style format",
1163 i + 1, dollar_max_arg_used);
1166 if (found_pointer_gap
1167 || (dollar_first_arg_num
1168 && dollar_max_arg_used < dollar_arguments_count))
1170 res->number_other--;
1171 res->number_dollar_extra_args++;
1176 /* Retrieve the specification for a format flag. SPEC contains the
1177 specifications for format flags for the applicable kind of format.
1178 FLAG is the flag in question. If PREDICATES is NULL, the basic
1179 spec for that flag must be retrieved and must exist. If
1180 PREDICATES is not NULL, it is a string listing possible predicates
1181 for the spec entry; if an entry predicated on any of these is
1182 found, it is returned, otherwise NULL is returned. */
1184 static const format_flag_spec *
1185 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1188 for (i = 0; spec[i].flag_char != 0; i++)
1190 if (spec[i].flag_char != flag)
1192 if (predicates != NULL)
1194 if (spec[i].predicate != 0
1195 && strchr (predicates, spec[i].predicate) != 0)
1198 else if (spec[i].predicate == 0)
1201 gcc_assert (predicates);
1206 /* Check the argument list of a call to printf, scanf, etc.
1207 INFO points to the function_format_info structure.
1208 PARAMS is the list of argument values. */
1211 check_format_info (function_format_info *info, tree params)
1213 format_check_context format_ctx;
1214 unsigned HOST_WIDE_INT arg_num;
1216 format_check_results res;
1217 /* Skip to format argument. If the argument isn't available, there's
1218 no work for us to do; prototype checking will catch the problem. */
1219 for (arg_num = 1; ; ++arg_num)
1223 if (arg_num == info->format_num)
1225 params = TREE_CHAIN (params);
1227 format_tree = TREE_VALUE (params);
1228 params = TREE_CHAIN (params);
1229 if (format_tree == 0)
1232 res.number_non_literal = 0;
1233 res.number_extra_args = 0;
1234 res.number_dollar_extra_args = 0;
1235 res.number_wide = 0;
1236 res.number_empty = 0;
1237 res.number_unterminated = 0;
1238 res.number_other = 0;
1240 format_ctx.res = &res;
1241 format_ctx.info = info;
1242 format_ctx.params = params;
1244 check_function_arguments_recurse (check_format_arg, &format_ctx,
1245 format_tree, arg_num);
1247 if (res.number_non_literal > 0)
1249 /* Functions taking a va_list normally pass a non-literal format
1250 string. These functions typically are declared with
1251 first_arg_num == 0, so avoid warning in those cases. */
1252 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1254 /* For strftime-like formats, warn for not checking the format
1255 string; but there are no arguments to check. */
1256 warning (OPT_Wformat_nonliteral,
1257 "format not a string literal, format string not checked");
1259 else if (info->first_arg_num != 0)
1261 /* If there are no arguments for the format at all, we may have
1262 printf (foo) which is likely to be a security hole. */
1263 while (arg_num + 1 < info->first_arg_num)
1267 params = TREE_CHAIN (params);
1270 if (params == 0 && warn_format_security)
1271 warning (OPT_Wformat_security,
1272 "format not a string literal and no format arguments");
1273 else if (params == 0 && warn_format_nonliteral)
1274 warning (OPT_Wformat_nonliteral,
1275 "format not a string literal and no format arguments");
1277 warning (OPT_Wformat_nonliteral,
1278 "format not a string literal, argument types not checked");
1282 /* If there were extra arguments to the format, normally warn. However,
1283 the standard does say extra arguments are ignored, so in the specific
1284 case where we have multiple leaves (conditional expressions or
1285 ngettext) allow extra arguments if at least one leaf didn't have extra
1286 arguments, but was otherwise OK (either non-literal or checked OK).
1287 If the format is an empty string, this should be counted similarly to the
1288 case of extra format arguments. */
1289 if (res.number_extra_args > 0 && res.number_non_literal == 0
1290 && res.number_other == 0)
1291 warning (OPT_Wformat_extra_args, "too many arguments for format");
1292 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1293 && res.number_other == 0)
1294 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1295 if (res.number_empty > 0 && res.number_non_literal == 0
1296 && res.number_other == 0)
1297 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1298 format_types[info->format_type].name);
1300 if (res.number_wide > 0)
1301 warning (OPT_Wformat, "format is a wide character string");
1303 if (res.number_unterminated > 0)
1304 warning (OPT_Wformat, "unterminated format string");
1307 /* Callback from check_function_arguments_recurse to check a
1308 format string. FORMAT_TREE is the format parameter. ARG_NUM
1309 is the number of the format argument. CTX points to a
1310 format_check_context. */
1313 check_format_arg (void *ctx, tree format_tree,
1314 unsigned HOST_WIDE_INT arg_num)
1316 format_check_context *format_ctx = (format_check_context *) ctx;
1317 format_check_results *res = format_ctx->res;
1318 function_format_info *info = format_ctx->info;
1319 tree params = format_ctx->params;
1322 HOST_WIDE_INT offset;
1323 const char *format_chars;
1324 tree array_size = 0;
1326 alloc_pool fwt_pool;
1328 if (integer_zerop (format_tree))
1330 /* Skip to first argument to check, so we can see if this format
1331 has any arguments (it shouldn't). */
1332 while (arg_num + 1 < info->first_arg_num)
1336 params = TREE_CHAIN (params);
1341 res->number_other++;
1343 res->number_extra_args++;
1349 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1353 arg0 = TREE_OPERAND (format_tree, 0);
1354 arg1 = TREE_OPERAND (format_tree, 1);
1357 if (TREE_CODE (arg1) == INTEGER_CST)
1361 res->number_non_literal++;
1364 if (!host_integerp (arg1, 0)
1365 || (offset = tree_low_cst (arg1, 0)) < 0)
1367 res->number_non_literal++;
1371 if (TREE_CODE (format_tree) != ADDR_EXPR)
1373 res->number_non_literal++;
1376 format_tree = TREE_OPERAND (format_tree, 0);
1377 if (TREE_CODE (format_tree) == ARRAY_REF
1378 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1379 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1380 format_tree = TREE_OPERAND (format_tree, 0);
1381 if (TREE_CODE (format_tree) == VAR_DECL
1382 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1383 && (array_init = decl_constant_value (format_tree)) != format_tree
1384 && TREE_CODE (array_init) == STRING_CST)
1386 /* Extract the string constant initializer. Note that this may include
1387 a trailing NUL character that is not in the array (e.g.
1388 const char a[3] = "foo";). */
1389 array_size = DECL_SIZE_UNIT (format_tree);
1390 format_tree = array_init;
1392 if (TREE_CODE (format_tree) != STRING_CST)
1394 res->number_non_literal++;
1397 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1402 format_chars = TREE_STRING_POINTER (format_tree);
1403 format_length = TREE_STRING_LENGTH (format_tree);
1404 if (array_size != 0)
1406 /* Variable length arrays can't be initialized. */
1407 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1409 if (host_integerp (array_size, 0))
1411 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1412 if (array_size_value > 0
1413 && array_size_value == (int) array_size_value
1414 && format_length > array_size_value)
1415 format_length = array_size_value;
1420 if (offset >= format_length)
1422 res->number_non_literal++;
1425 format_chars += offset;
1426 format_length -= offset;
1428 if (format_length < 1 || format_chars[--format_length] != 0)
1430 res->number_unterminated++;
1433 if (format_length == 0)
1435 res->number_empty++;
1439 /* Skip to first argument to check. */
1440 while (arg_num + 1 < info->first_arg_num)
1444 params = TREE_CHAIN (params);
1447 /* Provisionally increment res->number_other; check_format_info_main
1448 will decrement it if it finds there are extra arguments, but this way
1449 need not adjust it for every return. */
1450 res->number_other++;
1451 fwt_pool = create_alloc_pool ("format_wanted_type pool",
1452 sizeof (format_wanted_type), 10);
1453 check_format_info_main (res, info, format_chars, format_length,
1454 params, arg_num, fwt_pool);
1455 free_alloc_pool (fwt_pool);
1459 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1460 is the NUL-terminated format string (which at this point may contain
1461 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1462 terminating NUL character). ARG_NUM is one less than the number of
1463 the first format argument to check; PARAMS points to that format
1464 argument in the list of arguments. */
1467 check_format_info_main (format_check_results *res,
1468 function_format_info *info, const char *format_chars,
1469 int format_length, tree params,
1470 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool)
1472 const char *orig_format_chars = format_chars;
1473 tree first_fillin_param = params;
1475 const format_kind_info *fki = &format_types[info->format_type];
1476 const format_flag_spec *flag_specs = fki->flag_specs;
1477 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1479 /* -1 if no conversions taking an operand have been found; 0 if one has
1480 and it didn't use $; 1 if $ formats are in use. */
1481 int has_operand_number = -1;
1483 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1488 int suppressed = FALSE;
1489 const char *length_chars = NULL;
1490 enum format_lengths length_chars_val = FMT_LEN_none;
1491 enum format_std_version length_chars_std = STD_C89;
1495 int main_arg_num = 0;
1496 tree main_arg_params = 0;
1497 enum format_std_version wanted_type_std;
1498 const char *wanted_type_name;
1499 format_wanted_type width_wanted_type;
1500 format_wanted_type precision_wanted_type;
1501 format_wanted_type main_wanted_type;
1502 format_wanted_type *first_wanted_type = NULL;
1503 format_wanted_type *last_wanted_type = NULL;
1504 const format_length_info *fli = NULL;
1505 const format_char_info *fci = NULL;
1506 char flag_chars[256];
1508 const char *format_start = format_chars;
1509 if (*format_chars == 0)
1511 if (format_chars - orig_format_chars != format_length)
1512 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
1513 if (info->first_arg_num != 0 && params != 0
1514 && has_operand_number <= 0)
1516 res->number_other--;
1517 res->number_extra_args++;
1519 if (has_operand_number > 0)
1520 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
1523 if (*format_chars++ != '%')
1525 if (*format_chars == 0)
1527 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1530 if (*format_chars == '%')
1537 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1539 /* Possibly read a $ operand number at the start of the format.
1540 If one was previously used, one is required here. If one
1541 is not used here, we can't immediately conclude this is a
1542 format without them, since it could be printf %m or scanf %*. */
1544 opnum = maybe_read_dollar_number (&format_chars, 0,
1546 &main_arg_params, fki);
1551 has_operand_number = 1;
1552 main_arg_num = opnum + info->first_arg_num - 1;
1555 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1557 if (avoid_dollar_number (format_chars))
1561 /* Read any format flags, but do not yet validate them beyond removing
1562 duplicates, since in general validation depends on the rest of
1564 while (*format_chars != 0
1565 && strchr (fki->flag_chars, *format_chars) != 0)
1567 const format_flag_spec *s = get_flag_spec (flag_specs,
1568 *format_chars, NULL);
1569 if (strchr (flag_chars, *format_chars) != 0)
1571 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1575 i = strlen (flag_chars);
1576 flag_chars[i++] = *format_chars;
1579 if (s->skip_next_char)
1582 if (*format_chars == 0)
1584 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1591 /* Read any format width, possibly * or *m$. */
1592 if (fki->width_char != 0)
1594 if (fki->width_type != NULL && *format_chars == '*')
1596 i = strlen (flag_chars);
1597 flag_chars[i++] = fki->width_char;
1599 /* "...a field width...may be indicated by an asterisk.
1600 In this case, an int argument supplies the field width..." */
1602 if (has_operand_number != 0)
1605 opnum = maybe_read_dollar_number (&format_chars,
1606 has_operand_number == 1,
1613 has_operand_number = 1;
1614 arg_num = opnum + info->first_arg_num - 1;
1617 has_operand_number = 0;
1621 if (avoid_dollar_number (format_chars))
1624 if (info->first_arg_num != 0)
1628 warning (OPT_Wformat, "too few arguments for format");
1631 cur_param = TREE_VALUE (params);
1632 if (has_operand_number <= 0)
1634 params = TREE_CHAIN (params);
1637 width_wanted_type.wanted_type = *fki->width_type;
1638 width_wanted_type.wanted_type_name = NULL;
1639 width_wanted_type.pointer_count = 0;
1640 width_wanted_type.char_lenient_flag = 0;
1641 width_wanted_type.writing_in_flag = 0;
1642 width_wanted_type.reading_from_flag = 0;
1643 width_wanted_type.name = _("field width");
1644 width_wanted_type.param = cur_param;
1645 width_wanted_type.arg_num = arg_num;
1646 width_wanted_type.next = NULL;
1647 if (last_wanted_type != 0)
1648 last_wanted_type->next = &width_wanted_type;
1649 if (first_wanted_type == 0)
1650 first_wanted_type = &width_wanted_type;
1651 last_wanted_type = &width_wanted_type;
1656 /* Possibly read a numeric width. If the width is zero,
1657 we complain if appropriate. */
1658 int non_zero_width_char = FALSE;
1659 int found_width = FALSE;
1660 while (ISDIGIT (*format_chars))
1663 if (*format_chars != '0')
1664 non_zero_width_char = TRUE;
1667 if (found_width && !non_zero_width_char &&
1668 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1669 warning (OPT_Wformat, "zero width in %s format", fki->name);
1672 i = strlen (flag_chars);
1673 flag_chars[i++] = fki->width_char;
1679 /* Read any format left precision (must be a number, not *). */
1680 if (fki->left_precision_char != 0 && *format_chars == '#')
1683 i = strlen (flag_chars);
1684 flag_chars[i++] = fki->left_precision_char;
1686 if (!ISDIGIT (*format_chars))
1687 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1688 while (ISDIGIT (*format_chars))
1692 /* Read any format precision, possibly * or *m$. */
1693 if (fki->precision_char != 0 && *format_chars == '.')
1696 i = strlen (flag_chars);
1697 flag_chars[i++] = fki->precision_char;
1699 if (fki->precision_type != NULL && *format_chars == '*')
1701 /* "...a...precision...may be indicated by an asterisk.
1702 In this case, an int argument supplies the...precision." */
1704 if (has_operand_number != 0)
1707 opnum = maybe_read_dollar_number (&format_chars,
1708 has_operand_number == 1,
1715 has_operand_number = 1;
1716 arg_num = opnum + info->first_arg_num - 1;
1719 has_operand_number = 0;
1723 if (avoid_dollar_number (format_chars))
1726 if (info->first_arg_num != 0)
1730 warning (OPT_Wformat, "too few arguments for format");
1733 cur_param = TREE_VALUE (params);
1734 if (has_operand_number <= 0)
1736 params = TREE_CHAIN (params);
1739 precision_wanted_type.wanted_type = *fki->precision_type;
1740 precision_wanted_type.wanted_type_name = NULL;
1741 precision_wanted_type.pointer_count = 0;
1742 precision_wanted_type.char_lenient_flag = 0;
1743 precision_wanted_type.writing_in_flag = 0;
1744 precision_wanted_type.reading_from_flag = 0;
1745 precision_wanted_type.name = _("field precision");
1746 precision_wanted_type.param = cur_param;
1747 precision_wanted_type.arg_num = arg_num;
1748 precision_wanted_type.next = NULL;
1749 if (last_wanted_type != 0)
1750 last_wanted_type->next = &precision_wanted_type;
1751 if (first_wanted_type == 0)
1752 first_wanted_type = &precision_wanted_type;
1753 last_wanted_type = &precision_wanted_type;
1758 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1759 && !ISDIGIT (*format_chars))
1760 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1761 while (ISDIGIT (*format_chars))
1766 if (fki->alloc_char && fki->alloc_char == *format_chars)
1768 i = strlen (flag_chars);
1769 flag_chars[i++] = fki->alloc_char;
1774 /* Handle the scanf allocation kludge. */
1775 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1777 if (*format_chars == 'a' && !flag_isoc99)
1779 if (format_chars[1] == 's' || format_chars[1] == 'S'
1780 || format_chars[1] == '[')
1782 /* 'a' is used as a flag. */
1783 i = strlen (flag_chars);
1784 flag_chars[i++] = 'a';
1791 /* Read any length modifier, if this kind of format has them. */
1792 fli = fki->length_char_specs;
1793 length_chars = NULL;
1794 length_chars_val = FMT_LEN_none;
1795 length_chars_std = STD_C89;
1798 while (fli->name != 0
1799 && strncmp (fli->name, format_chars, strlen (fli->name)))
1802 * DragonFly's D conversion needs to have precedence
1803 * over the DD length modifier
1805 if (fli->index == FMT_LEN_D
1806 && fki->conversion_specs == print_char_table)
1807 while (fli->name != 0)
1811 format_chars += strlen (fli->name);
1812 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1815 length_chars = fli->double_name;
1816 length_chars_val = fli->double_index;
1817 length_chars_std = fli->double_std;
1821 length_chars = fli->name;
1822 length_chars_val = fli->index;
1823 length_chars_std = fli->std;
1825 i = strlen (flag_chars);
1826 flag_chars[i++] = fki->length_code_char;
1831 /* Warn if the length modifier is non-standard. */
1832 if (ADJ_STD (length_chars_std) > C_STD_VER)
1833 warning (OPT_Wformat,
1834 "%s does not support the %qs %s length modifier",
1835 C_STD_NAME (length_chars_std), length_chars,
1840 /* Read any modifier (strftime E/O). */
1841 if (fki->modifier_chars != NULL)
1843 while (*format_chars != 0
1844 && strchr (fki->modifier_chars, *format_chars) != 0)
1846 if (strchr (flag_chars, *format_chars) != 0)
1848 const format_flag_spec *s = get_flag_spec (flag_specs,
1849 *format_chars, NULL);
1850 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1854 i = strlen (flag_chars);
1855 flag_chars[i++] = *format_chars;
1862 format_char = *format_chars;
1863 if (format_char == 0
1864 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1865 && format_char == '%'))
1867 warning (OPT_Wformat, "conversion lacks type at end of format");
1871 fci = fki->conversion_specs;
1872 while (fci->format_chars != 0
1873 && strchr (fci->format_chars, format_char) == 0)
1875 if (fci->format_chars == 0)
1877 if (ISGRAPH (format_char))
1878 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1881 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1887 if (ADJ_STD (fci->std) > C_STD_VER)
1888 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1889 C_STD_NAME (fci->std), format_char, fki->name);
1892 /* Validate the individual flags used, removing any that are invalid. */
1895 for (i = 0; flag_chars[i] != 0; i++)
1897 const format_flag_spec *s = get_flag_spec (flag_specs,
1898 flag_chars[i], NULL);
1899 flag_chars[i - d] = flag_chars[i];
1900 if (flag_chars[i] == fki->length_code_char)
1902 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1904 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1905 _(s->name), format_char, fki->name);
1911 const format_flag_spec *t;
1912 if (ADJ_STD (s->std) > C_STD_VER)
1913 warning (OPT_Wformat, "%s does not support %s",
1914 C_STD_NAME (s->std), _(s->long_name));
1915 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1916 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1918 const char *long_name = (t->long_name != NULL
1921 if (ADJ_STD (t->std) > C_STD_VER)
1922 warning (OPT_Wformat,
1923 "%s does not support %s with the %<%%%c%> %s format",
1924 C_STD_NAME (t->std), _(long_name),
1925 format_char, fki->name);
1929 flag_chars[i - d] = 0;
1932 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1933 && strchr (flag_chars, 'a') != 0)
1935 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0)
1938 if (fki->suppression_char
1939 && strchr (flag_chars, fki->suppression_char) != 0)
1942 /* Validate the pairs of flags used. */
1943 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1945 const format_flag_spec *s, *t;
1946 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1948 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1950 if (bad_flag_pairs[i].predicate != 0
1951 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1953 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1954 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1955 if (bad_flag_pairs[i].ignored)
1957 if (bad_flag_pairs[i].predicate != 0)
1958 warning (OPT_Wformat,
1959 "%s ignored with %s and %<%%%c%> %s format",
1960 _(s->name), _(t->name), format_char,
1963 warning (OPT_Wformat, "%s ignored with %s in %s format",
1964 _(s->name), _(t->name), fki->name);
1968 if (bad_flag_pairs[i].predicate != 0)
1969 warning (OPT_Wformat,
1970 "use of %s and %s together with %<%%%c%> %s format",
1971 _(s->name), _(t->name), format_char,
1974 warning (OPT_Wformat, "use of %s and %s together in %s format",
1975 _(s->name), _(t->name), fki->name);
1979 /* Give Y2K warnings. */
1980 if (warn_format_y2k)
1983 if (strchr (fci->flags2, '4') != 0)
1984 if (strchr (flag_chars, 'E') != 0)
1988 else if (strchr (fci->flags2, '3') != 0)
1990 else if (strchr (fci->flags2, '2') != 0)
1993 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1994 "year in some locales", format_char);
1995 else if (y2k_level == 2)
1996 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1997 "year", format_char);
2000 if (strchr (fci->flags2, '[') != 0)
2002 /* Skip over scan set, in case it happens to have '%' in it. */
2003 if (*format_chars == '^')
2005 /* Find closing bracket; if one is hit immediately, then
2006 it's part of the scan set rather than a terminator. */
2007 if (*format_chars == ']')
2009 while (*format_chars && *format_chars != ']')
2011 if (*format_chars != ']')
2012 /* The end of the format string was reached. */
2013 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
2017 wanted_type_name = 0;
2018 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
2020 wanted_type = (fci->types[length_chars_val].type
2021 ? *fci->types[length_chars_val].type : 0);
2022 wanted_type_name = fci->types[length_chars_val].name;
2023 wanted_type_std = fci->types[length_chars_val].std;
2024 if (wanted_type == 0)
2026 warning (OPT_Wformat,
2027 "use of %qs length modifier with %qc type character",
2028 length_chars, format_char);
2029 /* Heuristic: skip one argument when an invalid length/type
2030 combination is encountered. */
2034 warning (OPT_Wformat, "too few arguments for format");
2037 params = TREE_CHAIN (params);
2041 /* Warn if non-standard, provided it is more non-standard
2042 than the length and type characters that may already
2043 have been warned for. */
2044 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2045 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2047 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2048 warning (OPT_Wformat,
2049 "%s does not support the %<%%%s%c%> %s format",
2050 C_STD_NAME (wanted_type_std), length_chars,
2051 format_char, fki->name);
2055 main_wanted_type.next = NULL;
2057 /* Finally. . .check type of argument against desired type! */
2058 if (info->first_arg_num == 0)
2060 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2063 if (main_arg_num != 0)
2066 warning (OPT_Wformat, "operand number specified with "
2067 "suppressed assignment");
2069 warning (OPT_Wformat, "operand number specified for format "
2070 "taking no argument");
2075 format_wanted_type *wanted_type_ptr;
2077 if (main_arg_num != 0)
2079 arg_num = main_arg_num;
2080 params = main_arg_params;
2085 if (has_operand_number > 0)
2087 warning (OPT_Wformat, "missing $ operand number in format");
2091 has_operand_number = 0;
2094 wanted_type_ptr = &main_wanted_type;
2099 warning (OPT_Wformat, "too few arguments for format");
2103 cur_param = TREE_VALUE (params);
2104 params = TREE_CHAIN (params);
2106 wanted_type_ptr->wanted_type = wanted_type;
2107 wanted_type_ptr->wanted_type_name = wanted_type_name;
2108 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2109 wanted_type_ptr->char_lenient_flag = 0;
2110 if (strchr (fci->flags2, 'c') != 0)
2111 wanted_type_ptr->char_lenient_flag = 1;
2112 wanted_type_ptr->writing_in_flag = 0;
2113 wanted_type_ptr->reading_from_flag = 0;
2115 wanted_type_ptr->writing_in_flag = 1;
2118 if (strchr (fci->flags2, 'W') != 0)
2119 wanted_type_ptr->writing_in_flag = 1;
2120 if (strchr (fci->flags2, 'R') != 0)
2121 wanted_type_ptr->reading_from_flag = 1;
2123 wanted_type_ptr->name = NULL;
2124 wanted_type_ptr->param = cur_param;
2125 wanted_type_ptr->arg_num = arg_num;
2126 wanted_type_ptr->next = NULL;
2127 if (last_wanted_type != 0)
2128 last_wanted_type->next = wanted_type_ptr;
2129 if (first_wanted_type == 0)
2130 first_wanted_type = wanted_type_ptr;
2131 last_wanted_type = wanted_type_ptr;
2136 wanted_type_ptr = (format_wanted_type *)
2137 pool_alloc (fwt_pool);
2139 wanted_type = *fci->types[length_chars_val].type;
2140 wanted_type_name = fci->types[length_chars_val].name;
2145 if (first_wanted_type != 0)
2146 check_format_types (first_wanted_type, format_start,
2147 format_chars - format_start);
2152 /* Check the argument types from a single format conversion (possibly
2153 including width and precision arguments). */
2155 check_format_types (format_wanted_type *types, const char *format_start,
2158 for (; types != 0; types = types->next)
2167 cur_param = types->param;
2168 cur_type = TREE_TYPE (cur_param);
2169 if (cur_type == error_mark_node)
2171 orig_cur_type = cur_type;
2173 wanted_type = types->wanted_type;
2174 arg_num = types->arg_num;
2176 /* The following should not occur here. */
2177 gcc_assert (wanted_type);
2178 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2180 if (types->pointer_count == 0)
2181 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2183 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2185 STRIP_NOPS (cur_param);
2187 /* Check the types of any additional pointer arguments
2188 that precede the "real" argument. */
2189 for (i = 0; i < types->pointer_count; ++i)
2191 if (TREE_CODE (cur_type) == POINTER_TYPE)
2193 cur_type = TREE_TYPE (cur_type);
2194 if (cur_type == error_mark_node)
2197 /* Check for writing through a NULL pointer. */
2198 if (types->writing_in_flag
2201 && integer_zerop (cur_param))
2202 warning (OPT_Wformat, "writing through null pointer "
2203 "(argument %d)", arg_num);
2205 /* Check for reading through a NULL pointer. */
2206 if (types->reading_from_flag
2209 && integer_zerop (cur_param))
2210 warning (OPT_Wformat, "reading through null pointer "
2211 "(argument %d)", arg_num);
2213 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2214 cur_param = TREE_OPERAND (cur_param, 0);
2218 /* See if this is an attempt to write into a const type with
2219 scanf or with printf "%n". Note: the writing in happens
2220 at the first indirection only, if for example
2221 void * const * is passed to scanf %p; passing
2222 const void ** is simply passing an incompatible type. */
2223 if (types->writing_in_flag
2225 && (TYPE_READONLY (cur_type)
2227 && (CONSTANT_CLASS_P (cur_param)
2228 || (DECL_P (cur_param)
2229 && TREE_READONLY (cur_param))))))
2230 warning (OPT_Wformat, "writing into constant object "
2231 "(argument %d)", arg_num);
2233 /* If there are extra type qualifiers beyond the first
2234 indirection, then this makes the types technically
2238 && (TYPE_READONLY (cur_type)
2239 || TYPE_VOLATILE (cur_type)
2240 || TYPE_RESTRICT (cur_type)))
2241 warning (OPT_Wformat, "extra type qualifiers in format "
2242 "argument (argument %d)",
2248 format_type_warning (types->name, format_start, format_length,
2249 wanted_type, types->pointer_count,
2250 types->wanted_type_name, orig_cur_type,
2256 if (i < types->pointer_count)
2259 cur_type = TYPE_MAIN_VARIANT (cur_type);
2261 /* Check whether the argument type is a character type. This leniency
2262 only applies to certain formats, flagged with 'c'.
2264 if (types->char_lenient_flag)
2265 char_type_flag = (cur_type == char_type_node
2266 || cur_type == signed_char_type_node
2267 || cur_type == unsigned_char_type_node);
2269 /* Check the type of the "real" argument, if there's a type we want. */
2270 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2272 /* If we want 'void *', allow any pointer type.
2273 (Anything else would already have got a warning.)
2274 With -pedantic, only allow pointers to void and to character
2276 if (wanted_type == void_type_node
2277 && (!pedantic || (i == 1 && char_type_flag)))
2279 /* Don't warn about differences merely in signedness, unless
2280 -pedantic. With -pedantic, warn if the type is a pointer
2281 target and not a character type, and for character types at
2282 a second level of indirection. */
2283 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2284 && TREE_CODE (cur_type) == INTEGER_TYPE
2285 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2286 && (TYPE_UNSIGNED (wanted_type)
2287 ? wanted_type == c_common_unsigned_type (cur_type)
2288 : wanted_type == c_common_signed_type (cur_type)))
2290 /* Likewise, "signed char", "unsigned char" and "char" are
2291 equivalent but the above test won't consider them equivalent. */
2292 if (wanted_type == char_type_node
2293 && (!pedantic || i < 2)
2296 /* Now we have a type mismatch. */
2297 format_type_warning (types->name, format_start, format_length,
2298 wanted_type, types->pointer_count,
2299 types->wanted_type_name, orig_cur_type, arg_num);
2304 /* Give a warning about a format argument of different type from that
2305 expected. DESCR is a description such as "field precision", or
2306 NULL for an ordinary format. For an ordinary format, FORMAT_START
2307 points to where the format starts in the format string and
2308 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2309 should have after POINTER_COUNT pointer dereferences.
2310 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2311 or NULL if the ordinary name of the type should be used. ARG_TYPE
2312 is the type of the actual argument. ARG_NUM is the number of that
2315 format_type_warning (const char *descr, const char *format_start,
2316 int format_length, tree wanted_type, int pointer_count,
2317 const char *wanted_type_name, tree arg_type, int arg_num)
2320 /* If ARG_TYPE is a typedef with a misleading name (for example,
2321 size_t but not the standard size_t expected by printf %zu), avoid
2322 printing the typedef name. */
2323 if (wanted_type_name
2324 && TYPE_NAME (arg_type)
2325 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2326 && DECL_NAME (TYPE_NAME (arg_type))
2327 && !strcmp (wanted_type_name,
2328 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2329 arg_type = TYPE_MAIN_VARIANT (arg_type);
2330 /* The format type and name exclude any '*' for pointers, so those
2331 must be formatted manually. For all the types we currently have,
2332 this is adequate, but formats taking pointers to functions or
2333 arrays would require the full type to be built up in order to
2334 print it with %T. */
2335 p = (char *) alloca (pointer_count + 2);
2336 if (pointer_count == 0)
2338 else if (c_dialect_cxx ())
2340 memset (p, '*', pointer_count);
2341 p[pointer_count] = 0;
2346 memset (p + 1, '*', pointer_count);
2347 p[pointer_count + 1] = 0;
2349 if (wanted_type_name)
2352 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2353 "but argument %d has type %qT",
2354 descr, wanted_type_name, p, arg_num, arg_type);
2356 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2357 "but argument %d has type %qT",
2358 format_length, format_start, wanted_type_name, p,
2364 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2365 "but argument %d has type %qT",
2366 descr, wanted_type, p, arg_num, arg_type);
2368 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2369 "but argument %d has type %qT",
2370 format_length, format_start, wanted_type, p, arg_num, arg_type);
2375 /* Given a format_char_info array FCI, and a character C, this function
2376 returns the index into the conversion_specs where that specifier's
2377 data is located. The character must exist. */
2379 find_char_info_specifier_index (const format_char_info *fci, int c)
2383 for (i = 0; fci->format_chars; i++, fci++)
2384 if (strchr (fci->format_chars, c))
2387 /* We shouldn't be looking for a non-existent specifier. */
2391 /* Given a format_length_info array FLI, and a character C, this
2392 function returns the index into the conversion_specs where that
2393 modifier's data is located. The character must exist. */
2395 find_length_info_modifier_index (const format_length_info *fli, int c)
2399 for (i = 0; fli->name; i++, fli++)
2400 if (strchr (fli->name, c))
2403 /* We shouldn't be looking for a non-existent modifier. */
2407 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2408 use in GCC's __asm_fprintf__ custom format attribute. You must
2409 have set dynamic_format_types before calling this function. */
2411 init_dynamic_asm_fprintf_info (void)
2417 format_length_info *new_asm_fprintf_length_specs;
2420 /* Find the underlying type for HOST_WIDE_INT. For the %w
2421 length modifier to work, one must have issued: "typedef
2422 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2423 prior to using that modifier. */
2424 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2427 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2430 hwi = identifier_global_value (hwi);
2431 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2433 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2436 hwi = DECL_ORIGINAL_TYPE (hwi);
2438 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2440 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2441 " or %<long long%>");
2445 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2446 new_asm_fprintf_length_specs = (format_length_info *)
2447 xmemdup (asm_fprintf_length_specs,
2448 sizeof (asm_fprintf_length_specs),
2449 sizeof (asm_fprintf_length_specs));
2451 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2452 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2453 if (hwi == long_integer_type_node)
2454 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2455 else if (hwi == long_long_integer_type_node)
2456 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2460 /* Assign the new data for use. */
2461 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2462 new_asm_fprintf_length_specs;
2466 /* Determine the type of a "locus" in the code being compiled for use
2467 in GCC's __gcc_gfc__ custom format attribute. You must have set
2468 dynamic_format_types before calling this function. */
2470 init_dynamic_gfc_info (void)
2476 static format_char_info *gfc_fci;
2478 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2479 must have declared 'locus' prior to using this attribute. If
2480 we haven't seen this declarations then you shouldn't use the
2481 specifier requiring that type. */
2482 if ((locus = maybe_get_identifier ("locus")))
2484 locus = identifier_global_value (locus);
2487 if (TREE_CODE (locus) != TYPE_DECL
2488 || TREE_TYPE (locus) == error_mark_node)
2490 error ("%<locus%> is not defined as a type");
2494 locus = TREE_TYPE (locus);
2498 /* Assign the new data for use. */
2500 /* Handle the __gcc_gfc__ format specifics. */
2502 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2503 gfc_fci = (format_char_info *)
2504 xmemdup (gcc_gfc_char_table,
2505 sizeof (gcc_gfc_char_table),
2506 sizeof (gcc_gfc_char_table));
2509 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2510 gfc_fci[i].types[0].type = &locus;
2511 gfc_fci[i].pointer_count = 1;
2516 /* Determine the types of "tree" and "location_t" in the code being
2517 compiled for use in GCC's diagnostic custom format attributes. You
2518 must have set dynamic_format_types before calling this function. */
2520 init_dynamic_diag_info (void)
2522 static tree t, loc, hwi;
2524 if (!loc || !t || !hwi)
2526 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2527 static format_length_info *diag_ls;
2530 /* For the GCC-diagnostics custom format specifiers to work, one
2531 must have declared 'tree' and/or 'location_t' prior to using
2532 those attributes. If we haven't seen these declarations then
2533 you shouldn't use the specifiers requiring these types.
2534 However we don't force a hard ICE because we may see only one
2535 or the other type. */
2536 if ((loc = maybe_get_identifier ("location_t")))
2538 loc = identifier_global_value (loc);
2541 if (TREE_CODE (loc) != TYPE_DECL)
2543 error ("%<location_t%> is not defined as a type");
2547 loc = TREE_TYPE (loc);
2551 /* We need to grab the underlying 'union tree_node' so peek into
2552 an extra type level. */
2553 if ((t = maybe_get_identifier ("tree")))
2555 t = identifier_global_value (t);
2558 if (TREE_CODE (t) != TYPE_DECL)
2560 error ("%<tree%> is not defined as a type");
2563 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2565 error ("%<tree%> is not defined as a pointer type");
2569 t = TREE_TYPE (TREE_TYPE (t));
2573 /* Find the underlying type for HOST_WIDE_INT. For the %w
2574 length modifier to work, one must have issued: "typedef
2575 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2576 prior to using that modifier. */
2577 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2579 hwi = identifier_global_value (hwi);
2582 if (TREE_CODE (hwi) != TYPE_DECL)
2584 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2589 hwi = DECL_ORIGINAL_TYPE (hwi);
2591 if (hwi != long_integer_type_node
2592 && hwi != long_long_integer_type_node)
2594 error ("%<__gcc_host_wide_int__%> is not defined"
2595 " as %<long%> or %<long long%>");
2602 /* Assign the new data for use. */
2604 /* All the GCC diag formats use the same length specs. */
2606 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2607 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2608 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2609 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2610 diag_ls = (format_length_info *)
2611 xmemdup (gcc_diag_length_specs,
2612 sizeof (gcc_diag_length_specs),
2613 sizeof (gcc_diag_length_specs));
2616 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2617 i = find_length_info_modifier_index (diag_ls, 'w');
2618 if (hwi == long_integer_type_node)
2619 diag_ls[i].index = FMT_LEN_l;
2620 else if (hwi == long_long_integer_type_node)
2621 diag_ls[i].index = FMT_LEN_ll;
2626 /* Handle the __gcc_diag__ format specifics. */
2628 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2629 diag_fci = (format_char_info *)
2630 xmemdup (gcc_diag_char_table,
2631 sizeof (gcc_diag_char_table),
2632 sizeof (gcc_diag_char_table));
2635 i = find_char_info_specifier_index (diag_fci, 'H');
2636 diag_fci[i].types[0].type = &loc;
2637 diag_fci[i].pointer_count = 1;
2641 i = find_char_info_specifier_index (diag_fci, 'J');
2642 diag_fci[i].types[0].type = &t;
2643 diag_fci[i].pointer_count = 1;
2644 i = find_char_info_specifier_index (diag_fci, 'K');
2645 diag_fci[i].types[0].type = &t;
2646 diag_fci[i].pointer_count = 1;
2649 /* Handle the __gcc_tdiag__ format specifics. */
2651 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2652 tdiag_fci = (format_char_info *)
2653 xmemdup (gcc_tdiag_char_table,
2654 sizeof (gcc_tdiag_char_table),
2655 sizeof (gcc_tdiag_char_table));
2658 i = find_char_info_specifier_index (tdiag_fci, 'H');
2659 tdiag_fci[i].types[0].type = &loc;
2660 tdiag_fci[i].pointer_count = 1;
2664 /* All specifiers taking a tree share the same struct. */
2665 i = find_char_info_specifier_index (tdiag_fci, 'D');
2666 tdiag_fci[i].types[0].type = &t;
2667 tdiag_fci[i].pointer_count = 1;
2668 i = find_char_info_specifier_index (tdiag_fci, 'J');
2669 tdiag_fci[i].types[0].type = &t;
2670 tdiag_fci[i].pointer_count = 1;
2671 i = find_char_info_specifier_index (tdiag_fci, 'K');
2672 tdiag_fci[i].types[0].type = &t;
2673 tdiag_fci[i].pointer_count = 1;
2676 /* Handle the __gcc_cdiag__ format specifics. */
2678 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2679 cdiag_fci = (format_char_info *)
2680 xmemdup (gcc_cdiag_char_table,
2681 sizeof (gcc_cdiag_char_table),
2682 sizeof (gcc_cdiag_char_table));
2685 i = find_char_info_specifier_index (cdiag_fci, 'H');
2686 cdiag_fci[i].types[0].type = &loc;
2687 cdiag_fci[i].pointer_count = 1;
2691 /* All specifiers taking a tree share the same struct. */
2692 i = find_char_info_specifier_index (cdiag_fci, 'D');
2693 cdiag_fci[i].types[0].type = &t;
2694 cdiag_fci[i].pointer_count = 1;
2695 i = find_char_info_specifier_index (cdiag_fci, 'J');
2696 cdiag_fci[i].types[0].type = &t;
2697 cdiag_fci[i].pointer_count = 1;
2698 i = find_char_info_specifier_index (cdiag_fci, 'K');
2699 cdiag_fci[i].types[0].type = &t;
2700 cdiag_fci[i].pointer_count = 1;
2703 /* Handle the __gcc_cxxdiag__ format specifics. */
2705 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2706 cxxdiag_fci = (format_char_info *)
2707 xmemdup (gcc_cxxdiag_char_table,
2708 sizeof (gcc_cxxdiag_char_table),
2709 sizeof (gcc_cxxdiag_char_table));
2712 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2713 cxxdiag_fci[i].types[0].type = &loc;
2714 cxxdiag_fci[i].pointer_count = 1;
2718 /* All specifiers taking a tree share the same struct. */
2719 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2720 cxxdiag_fci[i].types[0].type = &t;
2721 cxxdiag_fci[i].pointer_count = 1;
2722 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2723 cxxdiag_fci[i].types[0].type = &t;
2724 cxxdiag_fci[i].pointer_count = 1;
2725 i = find_char_info_specifier_index (cxxdiag_fci, 'K');
2726 cxxdiag_fci[i].types[0].type = &t;
2727 cxxdiag_fci[i].pointer_count = 1;
2732 #ifdef TARGET_FORMAT_TYPES
2733 extern const format_kind_info TARGET_FORMAT_TYPES[];
2736 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2737 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
2739 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2740 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
2743 /* Attributes such as "printf" are equivalent to those such as
2744 "gnu_printf" unless this is overridden by a target. */
2745 static const target_ovr_attr gnu_target_overrides_format_attributes[] =
2747 { "gnu_printf", "printf" },
2748 { "gnu_scanf", "scanf" },
2749 { "gnu_strftime", "strftime" },
2750 { "gnu_strfmon", "strfmon" },
2754 /* Translate to unified attribute name. This is used in decode_format_type and
2755 decode_format_attr. In attr_name the user specified argument is passed. It
2756 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2757 or the attr_name passed to this function, if there is no matching entry. */
2759 convert_format_name_to_system_name (const char *attr_name)
2763 if (attr_name == NULL || *attr_name == 0
2764 || strncmp (attr_name, "gcc_", 4) == 0)
2766 #ifdef TARGET_OVERRIDES_FORMAT_INIT
2767 TARGET_OVERRIDES_FORMAT_INIT ();
2770 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2771 /* Check if format attribute is overridden by target. */
2772 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
2773 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
2775 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
2777 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
2780 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
2782 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
2786 /* Otherwise default to gnu format. */
2788 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
2791 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
2794 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
2796 return gnu_target_overrides_format_attributes[i].named_attr_src;
2802 /* Return true if TATTR_NAME and ATTR_NAME are the same format attribute,
2803 counting "name" and "__name__" as the same, false otherwise. */
2805 cmp_attribs (const char *tattr_name, const char *attr_name)
2807 int alen = strlen (attr_name);
2808 int slen = (tattr_name ? strlen (tattr_name) : 0);
2809 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_'
2810 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_')
2815 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0)
2820 /* Handle a "format" attribute; arguments as in
2821 struct attribute_spec.handler. */
2823 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2824 int flags, bool *no_add_attrs)
2827 function_format_info info;
2830 #ifdef TARGET_FORMAT_TYPES
2831 /* If the target provides additional format types, we need to
2832 add them to FORMAT_TYPES at first use. */
2833 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2835 dynamic_format_types = XNEWVEC (format_kind_info,
2836 n_format_types + TARGET_N_FORMAT_TYPES);
2837 memcpy (dynamic_format_types, format_types_orig,
2838 sizeof (format_types_orig));
2839 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2840 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2842 format_types = dynamic_format_types;
2843 n_format_types += TARGET_N_FORMAT_TYPES;
2847 if (!decode_format_attr (args, &info, 0))
2849 *no_add_attrs = true;
2853 argument = TYPE_ARG_TYPES (type);
2856 if (!check_format_string (argument, info.format_num, flags,
2860 if (info.first_arg_num != 0)
2862 unsigned HOST_WIDE_INT arg_num = 1;
2864 /* Verify that first_arg_num points to the last arg,
2867 arg_num++, argument = TREE_CHAIN (argument);
2869 if (arg_num != info.first_arg_num)
2871 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2872 error ("args to be formatted is not %<...%>");
2873 *no_add_attrs = true;
2879 /* Check if this is a strftime variant. Just for this variant
2880 FMT_FLAG_ARG_CONVERT is not set. */
2881 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
2882 && info.first_arg_num != 0)
2884 error ("strftime formats cannot format arguments");
2885 *no_add_attrs = true;
2889 /* If this is a custom GCC-internal format type, we have to
2890 initialize certain bits a runtime. */
2891 if (info.format_type == asm_fprintf_format_type
2892 || info.format_type == gcc_gfc_format_type
2893 || info.format_type == gcc_diag_format_type
2894 || info.format_type == gcc_tdiag_format_type
2895 || info.format_type == gcc_cdiag_format_type
2896 || info.format_type == gcc_cxxdiag_format_type)
2898 /* Our first time through, we have to make sure that our
2899 format_type data is allocated dynamically and is modifiable. */
2900 if (!dynamic_format_types)
2901 format_types = dynamic_format_types = (format_kind_info *)
2902 xmemdup (format_types_orig, sizeof (format_types_orig),
2903 sizeof (format_types_orig));
2905 /* If this is format __asm_fprintf__, we have to initialize
2906 GCC's notion of HOST_WIDE_INT for checking %wd. */
2907 if (info.format_type == asm_fprintf_format_type)
2908 init_dynamic_asm_fprintf_info ();
2909 /* If this is format __gcc_gfc__, we have to initialize GCC's
2910 notion of 'locus' at runtime for %L. */
2911 else if (info.format_type == gcc_gfc_format_type)
2912 init_dynamic_gfc_info ();
2913 /* If this is one of the diagnostic attributes, then we have to
2914 initialize 'location_t' and 'tree' at runtime. */
2915 else if (info.format_type == gcc_diag_format_type
2916 || info.format_type == gcc_tdiag_format_type
2917 || info.format_type == gcc_cdiag_format_type
2918 || info.format_type == gcc_cxxdiag_format_type)
2919 init_dynamic_diag_info ();