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
26 #include "coretypes.h"
33 #include "diagnostic.h"
34 #include "langhooks.h"
37 /* Set format warning options according to a -Wformat=n option. */
40 set_Wformat (int setting)
42 warn_format = setting;
43 warn_format_extra_args = setting;
44 warn_format_zero_length = setting;
47 warn_format_nonliteral = setting;
48 warn_format_security = setting;
49 warn_format_y2k = setting;
51 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */
53 warn_nonnull = setting;
57 /* Handle attributes associated with format checking. */
59 /* This must be in the same order as format_types, except for
60 format_type_error. Target-specific format types do not have
61 matching enum values. */
62 enum format_type { printf_format_type, asm_fprintf_format_type,
63 gcc_diag_format_type, gcc_tdiag_format_type,
64 gcc_cdiag_format_type,
65 gcc_cxxdiag_format_type, gcc_gfc_format_type,
66 scanf_format_type, strftime_format_type,
67 strfmon_format_type, format_type_error = -1};
69 typedef struct function_format_info
71 int format_type; /* type of format (printf, scanf, etc.) */
72 unsigned HOST_WIDE_INT format_num; /* number of format argument */
73 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */
74 } function_format_info;
76 static bool decode_format_attr (tree, function_format_info *, int);
77 static int decode_format_type (const char *);
79 static bool check_format_string (tree argument,
80 unsigned HOST_WIDE_INT format_num,
81 int flags, bool *no_add_attrs);
82 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
86 /* Handle a "format_arg" attribute; arguments as in
87 struct attribute_spec.handler. */
89 handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
90 tree args, int flags, bool *no_add_attrs)
93 tree format_num_expr = TREE_VALUE (args);
94 unsigned HOST_WIDE_INT format_num = 0;
97 if (!get_constant (format_num_expr, &format_num, 0))
99 error ("format string has invalid operand number");
100 *no_add_attrs = true;
104 argument = TYPE_ARG_TYPES (type);
107 if (!check_format_string (argument, format_num, flags, no_add_attrs))
111 if (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
112 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
115 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
116 error ("function does not return string type");
117 *no_add_attrs = true;
124 /* Verify that the format_num argument is actually a string, in case
125 the format attribute is in error. */
127 check_format_string (tree argument, unsigned HOST_WIDE_INT format_num,
128 int flags, bool *no_add_attrs)
130 unsigned HOST_WIDE_INT i;
132 for (i = 1; i != format_num; i++)
136 argument = TREE_CHAIN (argument);
140 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
141 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
144 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
145 error ("format string argument not a string type");
146 *no_add_attrs = true;
153 /* Verify EXPR is a constant, and store its value.
154 If validated_p is true there should be no errors.
155 Returns true on success, false otherwise. */
157 get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
159 if (TREE_CODE (expr) != INTEGER_CST || TREE_INT_CST_HIGH (expr) != 0)
161 gcc_assert (!validated_p);
165 *value = TREE_INT_CST_LOW (expr);
170 /* Decode the arguments to a "format" attribute into a
171 function_format_info structure. It is already known that the list
172 is of the right length. If VALIDATED_P is true, then these
173 attributes have already been validated and must not be erroneous;
174 if false, it will give an error message. Returns true if the
175 attributes are successfully decoded, false otherwise. */
178 decode_format_attr (tree args, function_format_info *info, int validated_p)
180 tree format_type_id = TREE_VALUE (args);
181 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
182 tree first_arg_num_expr
183 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
185 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
187 gcc_assert (!validated_p);
188 error ("%Junrecognized format specifier", lang_hooks.decls.getdecls ());
193 const char *p = IDENTIFIER_POINTER (format_type_id);
195 info->format_type = decode_format_type (p);
197 if (info->format_type == format_type_error)
199 gcc_assert (!validated_p);
200 warning (OPT_Wformat, "%qE is an unrecognized format function type",
206 if (!get_constant (format_num_expr, &info->format_num, validated_p))
208 error ("format string has invalid operand number");
212 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
214 error ("%<...%> has invalid operand number");
218 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
220 gcc_assert (!validated_p);
221 error ("format string argument follows the args to be formatted");
228 /* Check a call to a format function against a parameter list. */
230 /* The C standard version C++ is treated as equivalent to
231 or inheriting from, for the purpose of format features supported. */
232 #define CPLUSPLUS_STD_VER STD_C94
233 /* The C standard version we are checking formats against when pedantic. */
234 #define C_STD_VER ((int) (c_dialect_cxx () \
235 ? CPLUSPLUS_STD_VER \
238 : (flag_isoc94 ? STD_C94 : STD_C89))))
239 /* The name to give to the standard version we are warning about when
240 pedantic. FEATURE_VER is the version in which the feature warned out
241 appeared, which is higher than C_STD_VER. */
242 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
244 : ((FEATURE_VER) == STD_EXT \
247 /* Adjust a C standard version, which may be STD_C9L, to account for
248 -Wno-long-long. Returns other standard versions unchanged. */
249 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
250 ? (warn_long_long ? STD_C99 : STD_C89) \
253 /* Structure describing details of a type expected in format checking,
254 and the type to check against it. */
255 typedef struct format_wanted_type
257 /* The type wanted. */
259 /* The name of this type to use in diagnostics. */
260 const char *wanted_type_name;
261 /* The level of indirection through pointers at which this type occurs. */
263 /* Whether, when pointer_count is 1, to allow any character type when
264 pedantic, rather than just the character or void type specified. */
265 int char_lenient_flag;
266 /* Whether the argument, dereferenced once, is written into and so the
267 argument must not be a pointer to a const-qualified type. */
269 /* Whether the argument, dereferenced once, is read from and so
270 must not be a NULL pointer. */
271 int reading_from_flag;
272 /* If warnings should be of the form "field precision should have
273 type 'int'", the name to use (in this case "field precision"),
274 otherwise NULL, for "format expects type 'long'" type
277 /* The actual parameter to check against the wanted type. */
279 /* The argument number of that parameter. */
281 /* The next type to check for this format conversion, or NULL if none. */
282 struct format_wanted_type *next;
283 } format_wanted_type;
286 static const format_length_info printf_length_specs[] =
288 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
289 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
290 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
291 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
292 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
293 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
294 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
295 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
296 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 },
297 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
298 { NULL, 0, 0, NULL, 0, 0 }
301 /* Length specifiers valid for asm_fprintf. */
302 static const format_length_info asm_fprintf_length_specs[] =
304 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
305 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
306 { NULL, 0, 0, NULL, 0, 0 }
309 /* Length specifiers valid for GCC diagnostics. */
310 static const format_length_info gcc_diag_length_specs[] =
312 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 },
313 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 },
314 { NULL, 0, 0, NULL, 0, 0 }
317 /* The custom diagnostics all accept the same length specifiers. */
318 #define gcc_tdiag_length_specs gcc_diag_length_specs
319 #define gcc_cdiag_length_specs gcc_diag_length_specs
320 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
322 /* This differs from printf_length_specs only in that "Z" is not accepted. */
323 static const format_length_info scanf_length_specs[] =
325 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
326 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
327 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
328 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
329 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
330 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
331 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
332 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 },
333 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT },
334 { NULL, 0, 0, NULL, 0, 0 }
338 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
339 make no sense for a format type not part of any C standard version. */
340 static const format_length_info strfmon_length_specs[] =
342 /* A GNU extension. */
343 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
344 { NULL, 0, 0, NULL, 0, 0 }
347 static const format_flag_spec printf_flag_specs[] =
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, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
352 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
353 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
354 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
355 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
356 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
357 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
358 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
359 { 0, 0, 0, NULL, NULL, 0 }
363 static const format_flag_pair printf_flag_pairs[] =
367 { '0', 'p', 1, 'i' },
371 static const format_flag_spec asm_fprintf_flag_specs[] =
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, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
376 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
377 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
378 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
379 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
380 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
381 { 0, 0, 0, NULL, NULL, 0 }
384 static const format_flag_pair asm_fprintf_flag_pairs[] =
388 { '0', 'p', 1, 'i' },
392 static const format_flag_pair gcc_diag_flag_pairs[] =
397 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
398 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
399 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
401 static const format_flag_pair gcc_gfc_flag_pairs[] =
406 static const format_flag_spec gcc_diag_flag_specs[] =
408 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
409 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
410 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
411 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
412 { 0, 0, 0, NULL, NULL, 0 }
415 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
416 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
418 static const format_flag_spec gcc_cxxdiag_flag_specs[] =
420 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
421 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
422 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
423 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
424 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
425 { 0, 0, 0, NULL, NULL, 0 }
428 static const format_flag_spec scanf_flag_specs[] =
430 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
431 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
432 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
433 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
434 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
435 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
436 { 0, 0, 0, NULL, NULL, 0 }
440 static const format_flag_pair scanf_flag_pairs[] =
447 static const format_flag_spec strftime_flag_specs[] =
449 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
450 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
451 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
452 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
453 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
454 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
455 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
456 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
457 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
458 { 0, 0, 0, NULL, NULL, 0 }
462 static const format_flag_pair strftime_flag_pairs[] =
473 static const format_flag_spec strfmon_flag_specs[] =
475 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), 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 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
481 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
482 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
483 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
484 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
485 { 0, 0, 0, NULL, NULL, 0 }
488 static const format_flag_pair strfmon_flag_pairs[] =
495 static const format_char_info print_char_table[] =
497 /* C89 conversion specifiers. */
498 { "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 },
499 { "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 },
500 { "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 },
501 { "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 },
502 { "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 },
503 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
504 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
505 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
506 { "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 },
507 /* C99 conversion specifiers. */
508 { "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 },
509 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
510 /* X/Open conversion specifiers. */
511 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
512 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
513 /* GNU conversion specifiers. */
514 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
515 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
518 static const format_char_info fbsd_ext_char_info =
519 { NULL, 1, STD_EXT, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL };
521 static const format_char_info fbsd_print_char_table[] =
523 /* BSD conversion specifiers. */
524 /* FreeBSD kernel extensions (src/sys/kern/subr_prf.c).
525 The format %b is supported to decode error registers.
526 Its usage is: printf("reg=%b\n", regval, "<base><arg>*");
527 which produces: reg=3<BITTWO,BITONE>
528 The format %D provides a hexdump given a pointer and separator string:
529 ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
530 ("%*D", len, ptr, " ") -> XX XX XX XX ...
532 { "D", 1, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", &fbsd_ext_char_info },
533 { "b", 0, STD_EXT, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", &fbsd_ext_char_info },
534 { "ry", 0, STD_EXT, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "i", NULL },
535 { NULL, 0, 0, NOLENGTHS, NULL, NULL }
538 static const format_char_info asm_fprintf_char_table[] =
540 /* C89 conversion specifiers. */
541 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
542 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
543 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
544 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
545 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
547 /* asm_fprintf conversion specifiers. */
548 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
549 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
550 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
551 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
552 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
553 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
554 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
555 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
558 static const format_char_info gcc_diag_char_table[] =
560 /* C89 conversion specifiers. */
561 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
562 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
563 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
564 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
565 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
566 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
568 /* Custom conversion specifiers. */
570 /* %H will require "location_t" at runtime. */
571 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
573 /* These will require a "tree" at runtime. */
574 { "J", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
576 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
577 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
578 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
581 static const format_char_info gcc_tdiag_char_table[] =
583 /* C89 conversion specifiers. */
584 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
585 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
586 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
587 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
588 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
589 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
591 /* Custom conversion specifiers. */
593 /* %H will require "location_t" at runtime. */
594 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
596 /* These will require a "tree" at runtime. */
597 { "DFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
599 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
600 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
601 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
604 static const format_char_info gcc_cdiag_char_table[] =
606 /* C89 conversion specifiers. */
607 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
608 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
609 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
610 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
611 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
612 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
614 /* Custom conversion specifiers. */
616 /* %H will require "location_t" at runtime. */
617 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
619 /* These will require a "tree" at runtime. */
620 { "DEFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
622 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
623 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
624 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
627 static const format_char_info gcc_cxxdiag_char_table[] =
629 /* C89 conversion specifiers. */
630 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
631 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
632 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
633 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
634 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
635 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
637 /* Custom conversion specifiers. */
639 /* %H will require "location_t" at runtime. */
640 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
642 /* These will require a "tree" at runtime. */
643 { "ADEFJTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
645 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
646 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
648 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
649 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
650 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
653 static const format_char_info gcc_gfc_char_table[] =
655 /* C89 conversion specifiers. */
656 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
657 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
658 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
660 /* gfc conversion specifiers. */
662 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
664 /* This will require a "locus" at runtime. */
665 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
667 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
670 static const format_char_info scan_char_table[] =
672 /* C89 conversion specifiers. */
673 { "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 },
674 { "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 },
675 { "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 },
676 { "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 },
677 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW", NULL },
678 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW", NULL },
679 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[", NULL },
680 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
681 { "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 },
682 /* C99 conversion specifiers. */
683 { "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 },
684 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
685 /* X/Open conversion specifiers. */
686 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
687 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W", NULL },
688 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
691 static const format_char_info time_char_table[] =
693 /* C89 conversion specifiers. */
694 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
695 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
696 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
697 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
698 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
699 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
700 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
701 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
702 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
703 /* C99 conversion specifiers. */
704 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
705 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
706 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
707 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
708 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
709 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
710 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
711 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
712 /* GNU conversion specifiers. */
713 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
714 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
715 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
718 static const format_char_info monetary_char_table[] =
720 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
721 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL }
724 /* This must be in the same order as enum format_type. */
725 static const format_kind_info format_types_orig[] =
727 { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
728 printf_flag_specs, printf_flag_pairs,
729 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
731 &integer_type_node, &integer_type_node
733 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
734 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
735 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
739 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL,
740 gcc_diag_flag_specs, gcc_diag_flag_pairs,
741 FMT_FLAG_ARG_CONVERT,
743 NULL, &integer_type_node
745 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL,
746 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
747 FMT_FLAG_ARG_CONVERT,
749 NULL, &integer_type_node
751 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL,
752 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
753 FMT_FLAG_ARG_CONVERT,
755 NULL, &integer_type_node
757 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
758 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
759 FMT_FLAG_ARG_CONVERT,
761 NULL, &integer_type_node
763 { "gcc_gfc", NULL, gcc_gfc_char_table, "", NULL,
764 NULL, gcc_gfc_flag_pairs,
765 FMT_FLAG_ARG_CONVERT,
769 { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
770 scanf_flag_specs, scanf_flag_pairs,
771 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
775 { "strftime", NULL, time_char_table, "_-0^#", "EO",
776 strftime_flag_specs, strftime_flag_pairs,
777 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0,
780 { "strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
781 strfmon_flag_specs, strfmon_flag_pairs,
782 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L',
785 { "printf0", printf_length_specs, print_char_table, " +#0-'I", NULL,
786 printf_flag_specs, printf_flag_pairs,
787 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK|FMT_FLAG_NULL_FORMAT_OK,
789 &integer_type_node, &integer_type_node
793 /* This layer of indirection allows GCC to reassign format_types with
794 new data if necessary, while still allowing the original data to be
796 static const format_kind_info *format_types = format_types_orig;
797 /* We can modify this one. We also add target-specific format types
798 to the end of the array. */
799 static format_kind_info *dynamic_format_types;
801 static int n_format_types = ARRAY_SIZE (format_types_orig);
803 /* Structure detailing the results of checking a format function call
804 where the format expression may be a conditional expression with
805 many leaves resulting from nested conditional expressions. */
808 /* Number of leaves of the format argument that could not be checked
809 as they were not string literals. */
810 int number_non_literal;
811 /* Number of leaves of the format argument that were null pointers or
812 string literals, but had extra format arguments. */
813 int number_extra_args;
814 /* Number of leaves of the format argument that were null pointers or
815 string literals, but had extra format arguments and used $ operand
817 int number_dollar_extra_args;
818 /* Number of leaves of the format argument that were wide string
821 /* Number of leaves of the format argument that were empty strings. */
823 /* Number of leaves of the format argument that were unterminated
825 int number_unterminated;
826 /* Number of leaves of the format argument that were not counted above. */
828 } format_check_results;
832 format_check_results *res;
833 function_format_info *info;
835 } format_check_context;
837 static void check_format_info (function_format_info *, tree);
838 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
839 static void check_format_info_main (format_check_results *,
840 function_format_info *,
841 const char *, int, tree,
842 unsigned HOST_WIDE_INT);
844 static void init_dollar_format_checking (int, tree);
845 static int maybe_read_dollar_number (const char **, int,
846 tree, tree *, const format_kind_info *);
847 static bool avoid_dollar_number (const char *);
848 static void finish_dollar_format_checking (format_check_results *, int);
850 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
853 static void check_format_types (format_wanted_type *, const char *, int);
854 static void format_type_warning (const char *, const char *, int, tree,
855 int, const char *, tree, int);
857 /* Decode a format type from a string, returning the type, or
858 format_type_error if not valid, in which case the caller should print an
861 decode_format_type (const char *s)
866 for (i = 0; i < n_format_types; i++)
869 if (!strcmp (s, format_types[i].name))
871 alen = strlen (format_types[i].name);
872 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
873 && s[slen - 1] == '_' && s[slen - 2] == '_'
874 && !strncmp (s + 2, format_types[i].name, alen))
877 return format_type_error;
881 /* Check the argument list of a call to printf, scanf, etc.
882 ATTRS are the attributes on the function type.
883 PARAMS is the list of argument values. Also, if -Wmissing-format-attribute,
884 warn for calls to vprintf or vscanf in functions with no such format
885 attribute themselves. */
888 check_function_format (tree attrs, tree params)
892 /* See if this function has any format attributes. */
893 for (a = attrs; a; a = TREE_CHAIN (a))
895 if (is_attribute_p ("format", TREE_PURPOSE (a)))
898 function_format_info info;
899 decode_format_attr (TREE_VALUE (a), &info, 1);
901 check_format_info (&info, params);
902 if (warn_missing_format_attribute && info.first_arg_num == 0
903 && (format_types[info.format_type].flags
904 & (int) FMT_FLAG_ARG_CONVERT))
907 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
910 if (is_attribute_p ("format", TREE_PURPOSE (c))
911 && (decode_format_type (IDENTIFIER_POINTER
912 (TREE_VALUE (TREE_VALUE (c))))
913 == info.format_type))
917 /* Check if the current function has a parameter to which
918 the format attribute could be attached; if not, it
919 can't be a candidate for a format attribute, despite
920 the vprintf-like or vscanf-like call. */
922 for (args = DECL_ARGUMENTS (current_function_decl);
924 args = TREE_CHAIN (args))
926 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
927 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
932 warning (OPT_Wmissing_format_attribute, "function might "
933 "be possible candidate for %qs format attribute",
934 format_types[info.format_type].name);
942 /* Variables used by the checking of $ operand number formats. */
943 static char *dollar_arguments_used = NULL;
944 static char *dollar_arguments_pointer_p = NULL;
945 static int dollar_arguments_alloc = 0;
946 static int dollar_arguments_count;
947 static int dollar_first_arg_num;
948 static int dollar_max_arg_used;
949 static int dollar_format_warned;
951 /* Initialize the checking for a format string that may contain $
952 parameter number specifications; we will need to keep track of whether
953 each parameter has been used. FIRST_ARG_NUM is the number of the first
954 argument that is a parameter to the format, or 0 for a vprintf-style
955 function; PARAMS is the list of arguments starting at this argument. */
958 init_dollar_format_checking (int first_arg_num, tree params)
960 tree oparams = params;
962 dollar_first_arg_num = first_arg_num;
963 dollar_arguments_count = 0;
964 dollar_max_arg_used = 0;
965 dollar_format_warned = 0;
966 if (first_arg_num > 0)
970 dollar_arguments_count++;
971 params = TREE_CHAIN (params);
974 if (dollar_arguments_alloc < dollar_arguments_count)
976 if (dollar_arguments_used)
977 free (dollar_arguments_used);
978 if (dollar_arguments_pointer_p)
979 free (dollar_arguments_pointer_p);
980 dollar_arguments_alloc = dollar_arguments_count;
981 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
982 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
984 if (dollar_arguments_alloc)
986 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
987 if (first_arg_num > 0)
993 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
995 params = TREE_CHAIN (params);
1003 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1004 is set, it is an error if one is not found; otherwise, it is OK. If
1005 such a number is found, check whether it is within range and mark that
1006 numbered operand as being used for later checking. Returns the operand
1007 number if found and within range, zero if no such number was found and
1008 this is OK, or -1 on error. PARAMS points to the first operand of the
1009 format; PARAM_PTR is made to point to the parameter referred to. If
1010 a $ format is found, *FORMAT is updated to point just after it. */
1013 maybe_read_dollar_number (const char **format,
1014 int dollar_needed, tree params, tree *param_ptr,
1015 const format_kind_info *fki)
1019 const char *fcp = *format;
1020 if (!ISDIGIT (*fcp))
1024 warning (OPT_Wformat, "missing $ operand number in format");
1032 while (ISDIGIT (*fcp))
1035 nargnum = 10 * argnum + (*fcp - '0');
1036 if (nargnum < 0 || nargnum / 10 != argnum)
1045 warning (OPT_Wformat, "missing $ operand number in format");
1052 if (pedantic && !dollar_format_warned)
1054 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1055 C_STD_NAME (STD_EXT));
1056 dollar_format_warned = 1;
1058 if (overflow_flag || argnum == 0
1059 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1061 warning (OPT_Wformat, "operand number out of range in format");
1064 if (argnum > dollar_max_arg_used)
1065 dollar_max_arg_used = argnum;
1066 /* For vprintf-style functions we may need to allocate more memory to
1067 track which arguments are used. */
1068 while (dollar_arguments_alloc < dollar_max_arg_used)
1071 nalloc = 2 * dollar_arguments_alloc + 16;
1072 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1074 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1076 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1077 nalloc - dollar_arguments_alloc);
1078 dollar_arguments_alloc = nalloc;
1080 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1081 && dollar_arguments_used[argnum - 1] == 1)
1083 dollar_arguments_used[argnum - 1] = 2;
1084 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1088 dollar_arguments_used[argnum - 1] = 1;
1089 if (dollar_first_arg_num)
1092 *param_ptr = params;
1093 for (i = 1; i < argnum && *param_ptr != 0; i++)
1094 *param_ptr = TREE_CHAIN (*param_ptr);
1096 /* This case shouldn't be caught here. */
1097 gcc_assert (*param_ptr);
1104 /* Ensure that FORMAT does not start with a decimal number followed by
1105 a $; give a diagnostic and return true if it does, false otherwise. */
1108 avoid_dollar_number (const char *format)
1110 if (!ISDIGIT (*format))
1112 while (ISDIGIT (*format))
1116 warning (OPT_Wformat, "$ operand number used after format without operand number");
1123 /* Finish the checking for a format string that used $ operand number formats
1124 instead of non-$ formats. We check for unused operands before used ones
1125 (a serious error, since the implementation of the format function
1126 can't know what types to pass to va_arg to find the later arguments).
1127 and for unused operands at the end of the format (if we know how many
1128 arguments the format had, so not for vprintf). If there were operand
1129 numbers out of range on a non-vprintf-style format, we won't have reached
1130 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1134 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1137 bool found_pointer_gap = false;
1138 for (i = 0; i < dollar_max_arg_used; i++)
1140 if (!dollar_arguments_used[i])
1142 if (pointer_gap_ok && (dollar_first_arg_num == 0
1143 || dollar_arguments_pointer_p[i]))
1144 found_pointer_gap = true;
1146 warning (OPT_Wformat,
1147 "format argument %d unused before used argument %d in $-style format",
1148 i + 1, dollar_max_arg_used);
1151 if (found_pointer_gap
1152 || (dollar_first_arg_num
1153 && dollar_max_arg_used < dollar_arguments_count))
1155 res->number_other--;
1156 res->number_dollar_extra_args++;
1161 /* Retrieve the specification for a format flag. SPEC contains the
1162 specifications for format flags for the applicable kind of format.
1163 FLAG is the flag in question. If PREDICATES is NULL, the basic
1164 spec for that flag must be retrieved and must exist. If
1165 PREDICATES is not NULL, it is a string listing possible predicates
1166 for the spec entry; if an entry predicated on any of these is
1167 found, it is returned, otherwise NULL is returned. */
1169 static const format_flag_spec *
1170 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1173 for (i = 0; spec[i].flag_char != 0; i++)
1175 if (spec[i].flag_char != flag)
1177 if (predicates != NULL)
1179 if (spec[i].predicate != 0
1180 && strchr (predicates, spec[i].predicate) != 0)
1183 else if (spec[i].predicate == 0)
1186 gcc_assert (predicates);
1191 /* Check the argument list of a call to printf, scanf, etc.
1192 INFO points to the function_format_info structure.
1193 PARAMS is the list of argument values. */
1196 check_format_info (function_format_info *info, tree params)
1198 format_check_context format_ctx;
1199 unsigned HOST_WIDE_INT arg_num;
1201 format_check_results res;
1202 /* Skip to format argument. If the argument isn't available, there's
1203 no work for us to do; prototype checking will catch the problem. */
1204 for (arg_num = 1; ; ++arg_num)
1208 if (arg_num == info->format_num)
1210 params = TREE_CHAIN (params);
1212 format_tree = TREE_VALUE (params);
1213 params = TREE_CHAIN (params);
1214 if (format_tree == 0)
1217 res.number_non_literal = 0;
1218 res.number_extra_args = 0;
1219 res.number_dollar_extra_args = 0;
1220 res.number_wide = 0;
1221 res.number_empty = 0;
1222 res.number_unterminated = 0;
1223 res.number_other = 0;
1225 format_ctx.res = &res;
1226 format_ctx.info = info;
1227 format_ctx.params = params;
1229 check_function_arguments_recurse (check_format_arg, &format_ctx,
1230 format_tree, arg_num);
1232 if (res.number_non_literal > 0)
1234 /* Functions taking a va_list normally pass a non-literal format
1235 string. These functions typically are declared with
1236 first_arg_num == 0, so avoid warning in those cases. */
1237 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1239 /* For strftime-like formats, warn for not checking the format
1240 string; but there are no arguments to check. */
1241 warning (OPT_Wformat_nonliteral,
1242 "format not a string literal, format string not checked");
1244 else if (info->first_arg_num != 0)
1246 /* If there are no arguments for the format at all, we may have
1247 printf (foo) which is likely to be a security hole. */
1248 while (arg_num + 1 < info->first_arg_num)
1252 params = TREE_CHAIN (params);
1255 if (params == 0 && warn_format_security)
1256 warning (OPT_Wformat_security,
1257 "format not a string literal and no format arguments");
1258 else if (params == 0 && warn_format_nonliteral)
1259 warning (OPT_Wformat_nonliteral,
1260 "format not a string literal and no format arguments");
1262 warning (OPT_Wformat_nonliteral,
1263 "format not a string literal, argument types not checked");
1267 /* If there were extra arguments to the format, normally warn. However,
1268 the standard does say extra arguments are ignored, so in the specific
1269 case where we have multiple leaves (conditional expressions or
1270 ngettext) allow extra arguments if at least one leaf didn't have extra
1271 arguments, but was otherwise OK (either non-literal or checked OK).
1272 If the format is an empty string, this should be counted similarly to the
1273 case of extra format arguments. */
1274 if (res.number_extra_args > 0 && res.number_non_literal == 0
1275 && res.number_other == 0)
1276 warning (OPT_Wformat_extra_args, "too many arguments for format");
1277 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1278 && res.number_other == 0)
1279 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1280 if (res.number_empty > 0 && res.number_non_literal == 0
1281 && res.number_other == 0)
1282 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1283 format_types[info->format_type].name);
1285 if (res.number_wide > 0)
1286 warning (OPT_Wformat, "format is a wide character string");
1288 if (res.number_unterminated > 0)
1289 warning (OPT_Wformat, "unterminated format string");
1292 /* Callback from check_function_arguments_recurse to check a
1293 format string. FORMAT_TREE is the format parameter. ARG_NUM
1294 is the number of the format argument. CTX points to a
1295 format_check_context. */
1298 check_format_arg (void *ctx, tree format_tree,
1299 unsigned HOST_WIDE_INT arg_num)
1301 format_check_context *format_ctx = (format_check_context *) ctx;
1302 format_check_results *res = format_ctx->res;
1303 function_format_info *info = format_ctx->info;
1304 tree params = format_ctx->params;
1307 HOST_WIDE_INT offset;
1308 const char *format_chars;
1309 tree array_size = 0;
1312 if (integer_zerop (format_tree))
1314 /* FIXME: this warning should go away once Marc Espie's
1315 __attribute__((nonnull)) patch is in. Instead, checking for
1316 nonnull attributes should probably change this function to act
1317 specially if info == NULL and add a res->number_null entry for
1318 that case, or maybe add a function pointer to be called at
1319 the end instead of hardcoding check_format_info_main. */
1320 if (!(format_types[info->format_type].flags & FMT_FLAG_NULL_FORMAT_OK))
1321 warning (OPT_Wformat, "null format string");
1323 /* Skip to first argument to check, so we can see if this format
1324 has any arguments (it shouldn't). */
1325 while (arg_num + 1 < info->first_arg_num)
1329 params = TREE_CHAIN (params);
1334 res->number_other++;
1336 res->number_extra_args++;
1342 if (TREE_CODE (format_tree) == PLUS_EXPR)
1346 arg0 = TREE_OPERAND (format_tree, 0);
1347 arg1 = TREE_OPERAND (format_tree, 1);
1350 if (TREE_CODE (arg1) == INTEGER_CST)
1352 else if (TREE_CODE (arg0) == INTEGER_CST)
1359 res->number_non_literal++;
1362 if (!host_integerp (arg1, 0)
1363 || (offset = tree_low_cst (arg1, 0)) < 0)
1365 res->number_non_literal++;
1369 if (TREE_CODE (format_tree) != ADDR_EXPR)
1371 res->number_non_literal++;
1374 format_tree = TREE_OPERAND (format_tree, 0);
1375 if (TREE_CODE (format_tree) == ARRAY_REF
1376 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1377 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1378 format_tree = TREE_OPERAND (format_tree, 0);
1379 if (TREE_CODE (format_tree) == VAR_DECL
1380 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1381 && (array_init = decl_constant_value (format_tree)) != format_tree
1382 && TREE_CODE (array_init) == STRING_CST)
1384 /* Extract the string constant initializer. Note that this may include
1385 a trailing NUL character that is not in the array (e.g.
1386 const char a[3] = "foo";). */
1387 array_size = DECL_SIZE_UNIT (format_tree);
1388 format_tree = array_init;
1390 if (TREE_CODE (format_tree) != STRING_CST)
1392 res->number_non_literal++;
1395 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1400 format_chars = TREE_STRING_POINTER (format_tree);
1401 format_length = TREE_STRING_LENGTH (format_tree);
1402 if (array_size != 0)
1404 /* Variable length arrays can't be initialized. */
1405 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1407 if (host_integerp (array_size, 0))
1409 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1410 if (array_size_value > 0
1411 && array_size_value == (int) array_size_value
1412 && format_length > array_size_value)
1413 format_length = array_size_value;
1418 if (offset >= format_length)
1420 res->number_non_literal++;
1423 format_chars += offset;
1424 format_length -= offset;
1426 if (format_length < 1)
1428 res->number_unterminated++;
1431 if (format_length == 1)
1433 res->number_empty++;
1436 if (format_chars[--format_length] != 0)
1438 res->number_unterminated++;
1442 /* Skip to first argument to check. */
1443 while (arg_num + 1 < info->first_arg_num)
1447 params = TREE_CHAIN (params);
1450 /* Provisionally increment res->number_other; check_format_info_main
1451 will decrement it if it finds there are extra arguments, but this way
1452 need not adjust it for every return. */
1453 res->number_other++;
1454 check_format_info_main (res, info, format_chars, format_length,
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)
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, "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 /* Read any length modifier, if this kind of format has them. */
1767 fli = fki->length_char_specs;
1768 length_chars = NULL;
1769 length_chars_val = FMT_LEN_none;
1770 length_chars_std = STD_C89;
1773 while (fli->name != 0 && fli->name[0] != *format_chars)
1776 * Make sure FreeBSD's D format char takes preference
1777 * over new DD length specifier if FreeBSD format
1778 * extensions are requested.
1780 if (fli->index == FMT_LEN_D && flag_format_extensions
1781 && fki->conversion_specs == print_char_table)
1782 while (fli->name != 0) fli++;
1786 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1789 length_chars = fli->double_name;
1790 length_chars_val = fli->double_index;
1791 length_chars_std = fli->double_std;
1795 length_chars = fli->name;
1796 length_chars_val = fli->index;
1797 length_chars_std = fli->std;
1799 i = strlen (flag_chars);
1800 flag_chars[i++] = fki->length_code_char;
1805 /* Warn if the length modifier is non-standard. */
1806 if (ADJ_STD (length_chars_std) > C_STD_VER)
1807 warning (OPT_Wformat,
1808 "%s does not support the %qs %s length modifier",
1809 C_STD_NAME (length_chars_std), length_chars,
1814 /* Read any modifier (strftime E/O). */
1815 if (fki->modifier_chars != NULL)
1817 while (*format_chars != 0
1818 && strchr (fki->modifier_chars, *format_chars) != 0)
1820 if (strchr (flag_chars, *format_chars) != 0)
1822 const format_flag_spec *s = get_flag_spec (flag_specs,
1823 *format_chars, NULL);
1824 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1828 i = strlen (flag_chars);
1829 flag_chars[i++] = *format_chars;
1836 /* Handle the scanf allocation kludge. */
1837 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1839 if (*format_chars == 'a' && !flag_isoc99)
1841 if (format_chars[1] == 's' || format_chars[1] == 'S'
1842 || format_chars[1] == '[')
1844 /* 'a' is used as a flag. */
1845 i = strlen (flag_chars);
1846 flag_chars[i++] = 'a';
1853 format_char = *format_chars;
1854 if (format_char == 0
1855 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
1856 && format_char == '%'))
1858 warning (OPT_Wformat, "conversion lacks type at end of format");
1862 fci = fki->conversion_specs;
1863 while (fci->format_chars != 0
1864 && strchr (fci->format_chars, format_char) == 0)
1866 if (fci->format_chars == 0 && flag_format_extensions
1867 && fki->conversion_specs == print_char_table)
1869 fci = fbsd_print_char_table;
1870 while (fci->format_chars != 0
1871 && strchr (fci->format_chars, format_char) == 0)
1874 if (fci->format_chars == 0)
1876 if (ISGRAPH (format_char))
1877 warning (OPT_Wformat, "unknown conversion type character %qc in format",
1880 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
1886 if (ADJ_STD (fci->std) > C_STD_VER)
1887 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
1888 C_STD_NAME (fci->std), format_char, fki->name);
1891 /* Validate the individual flags used, removing any that are invalid. */
1894 for (i = 0; flag_chars[i] != 0; i++)
1896 const format_flag_spec *s = get_flag_spec (flag_specs,
1897 flag_chars[i], NULL);
1898 flag_chars[i - d] = flag_chars[i];
1899 if (flag_chars[i] == fki->length_code_char)
1901 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
1903 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
1904 _(s->name), format_char, fki->name);
1910 const format_flag_spec *t;
1911 if (ADJ_STD (s->std) > C_STD_VER)
1912 warning (OPT_Wformat, "%s does not support %s",
1913 C_STD_NAME (s->std), _(s->long_name));
1914 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
1915 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1917 const char *long_name = (t->long_name != NULL
1920 if (ADJ_STD (t->std) > C_STD_VER)
1921 warning (OPT_Wformat,
1922 "%s does not support %s with the %<%%%c%> %s format",
1923 C_STD_NAME (t->std), _(long_name),
1924 format_char, fki->name);
1928 flag_chars[i - d] = 0;
1931 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1932 && strchr (flag_chars, 'a') != 0)
1935 if (fki->suppression_char
1936 && strchr (flag_chars, fki->suppression_char) != 0)
1939 /* Validate the pairs of flags used. */
1940 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
1942 const format_flag_spec *s, *t;
1943 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
1945 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
1947 if (bad_flag_pairs[i].predicate != 0
1948 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
1950 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
1951 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
1952 if (bad_flag_pairs[i].ignored)
1954 if (bad_flag_pairs[i].predicate != 0)
1955 warning (OPT_Wformat,
1956 "%s ignored with %s and %<%%%c%> %s format",
1957 _(s->name), _(t->name), format_char,
1960 warning (OPT_Wformat, "%s ignored with %s in %s format",
1961 _(s->name), _(t->name), fki->name);
1965 if (bad_flag_pairs[i].predicate != 0)
1966 warning (OPT_Wformat,
1967 "use of %s and %s together with %<%%%c%> %s format",
1968 _(s->name), _(t->name), format_char,
1971 warning (OPT_Wformat, "use of %s and %s together in %s format",
1972 _(s->name), _(t->name), fki->name);
1976 /* Give Y2K warnings. */
1977 if (warn_format_y2k)
1980 if (strchr (fci->flags2, '4') != 0)
1981 if (strchr (flag_chars, 'E') != 0)
1985 else if (strchr (fci->flags2, '3') != 0)
1987 else if (strchr (fci->flags2, '2') != 0)
1990 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1991 "year in some locales on non-BSD systems", format_char);
1992 else if (y2k_level == 2)
1993 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
1994 "year", format_char);
1997 if (strchr (fci->flags2, '[') != 0)
1999 /* Skip over scan set, in case it happens to have '%' in it. */
2000 if (*format_chars == '^')
2002 /* Find closing bracket; if one is hit immediately, then
2003 it's part of the scan set rather than a terminator. */
2004 if (*format_chars == ']')
2006 while (*format_chars && *format_chars != ']')
2008 if (*format_chars != ']')
2009 /* The end of the format string was reached. */
2010 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
2014 wanted_type_name = 0;
2015 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
2017 wanted_type = (fci->types[length_chars_val].type
2018 ? *fci->types[length_chars_val].type : 0);
2019 wanted_type_name = fci->types[length_chars_val].name;
2020 wanted_type_std = fci->types[length_chars_val].std;
2021 if (wanted_type == 0)
2023 warning (OPT_Wformat,
2024 "use of %qs length modifier with %qc type character",
2025 length_chars, format_char);
2026 /* Heuristic: skip one argument when an invalid length/type
2027 combination is encountered. */
2031 warning (OPT_Wformat, "too few arguments for format");
2034 params = TREE_CHAIN (params);
2038 /* Warn if non-standard, provided it is more non-standard
2039 than the length and type characters that may already
2040 have been warned for. */
2041 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2042 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2044 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2045 warning (OPT_Wformat,
2046 "%s does not support the %<%%%s%c%> %s format",
2047 C_STD_NAME (wanted_type_std), length_chars,
2048 format_char, fki->name);
2052 main_wanted_type.next = NULL;
2054 /* Finally. . .check type of argument against desired type! */
2055 if (info->first_arg_num == 0)
2057 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2060 if (main_arg_num != 0)
2063 warning (OPT_Wformat, "operand number specified with "
2064 "suppressed assignment");
2066 warning (OPT_Wformat, "operand number specified for format "
2067 "taking no argument");
2072 format_wanted_type *wanted_type_ptr;
2074 if (main_arg_num != 0)
2076 arg_num = main_arg_num;
2077 params = main_arg_params;
2082 if (has_operand_number > 0)
2084 warning (OPT_Wformat, "missing $ operand number in format");
2088 has_operand_number = 0;
2091 wanted_type_ptr = &main_wanted_type;
2096 warning (OPT_Wformat, "too few arguments for format");
2100 cur_param = TREE_VALUE (params);
2101 params = TREE_CHAIN (params);
2103 wanted_type_ptr->wanted_type = wanted_type;
2104 wanted_type_ptr->wanted_type_name = wanted_type_name;
2105 wanted_type_ptr->pointer_count = fci->pointer_count + aflag;
2106 wanted_type_ptr->char_lenient_flag = 0;
2107 if (strchr (fci->flags2, 'c') != 0)
2108 wanted_type_ptr->char_lenient_flag = 1;
2109 wanted_type_ptr->writing_in_flag = 0;
2110 wanted_type_ptr->reading_from_flag = 0;
2112 wanted_type_ptr->writing_in_flag = 1;
2115 if (strchr (fci->flags2, 'W') != 0)
2116 wanted_type_ptr->writing_in_flag = 1;
2117 if (strchr (fci->flags2, 'R') != 0)
2118 wanted_type_ptr->reading_from_flag = 1;
2120 wanted_type_ptr->name = NULL;
2121 wanted_type_ptr->param = cur_param;
2122 wanted_type_ptr->arg_num = arg_num;
2123 wanted_type_ptr->next = NULL;
2124 if (last_wanted_type != 0)
2125 last_wanted_type->next = wanted_type_ptr;
2126 if (first_wanted_type == 0)
2127 first_wanted_type = wanted_type_ptr;
2128 last_wanted_type = wanted_type_ptr;
2133 wanted_type_ptr = GGC_NEW (format_wanted_type);
2135 wanted_type = *fci->types[length_chars_val].type;
2136 wanted_type_name = fci->types[length_chars_val].name;
2141 if (first_wanted_type != 0)
2142 check_format_types (first_wanted_type, format_start,
2143 format_chars - format_start);
2145 if (main_wanted_type.next != NULL)
2147 format_wanted_type *wanted_type_ptr = main_wanted_type.next;
2148 while (wanted_type_ptr)
2150 format_wanted_type *next = wanted_type_ptr->next;
2151 ggc_free (wanted_type_ptr);
2152 wanted_type_ptr = next;
2159 /* Check the argument types from a single format conversion (possibly
2160 including width and precision arguments). */
2162 check_format_types (format_wanted_type *types, const char *format_start,
2165 for (; types != 0; types = types->next)
2174 cur_param = types->param;
2175 cur_type = TREE_TYPE (cur_param);
2176 if (cur_type == error_mark_node)
2178 orig_cur_type = cur_type;
2180 wanted_type = types->wanted_type;
2181 arg_num = types->arg_num;
2183 /* The following should not occur here. */
2184 gcc_assert (wanted_type);
2185 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2187 if (types->pointer_count == 0)
2188 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2190 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2192 STRIP_NOPS (cur_param);
2194 /* Check the types of any additional pointer arguments
2195 that precede the "real" argument. */
2196 for (i = 0; i < types->pointer_count; ++i)
2198 if (TREE_CODE (cur_type) == POINTER_TYPE)
2200 cur_type = TREE_TYPE (cur_type);
2201 if (cur_type == error_mark_node)
2204 /* Check for writing through a NULL pointer. */
2205 if (types->writing_in_flag
2208 && integer_zerop (cur_param))
2209 warning (OPT_Wformat, "writing through null pointer "
2210 "(argument %d)", arg_num);
2212 /* Check for reading through a NULL pointer. */
2213 if (types->reading_from_flag
2216 && integer_zerop (cur_param))
2217 warning (OPT_Wformat, "reading through null pointer "
2218 "(argument %d)", arg_num);
2220 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2221 cur_param = TREE_OPERAND (cur_param, 0);
2225 /* See if this is an attempt to write into a const type with
2226 scanf or with printf "%n". Note: the writing in happens
2227 at the first indirection only, if for example
2228 void * const * is passed to scanf %p; passing
2229 const void ** is simply passing an incompatible type. */
2230 if (types->writing_in_flag
2232 && (TYPE_READONLY (cur_type)
2234 && (CONSTANT_CLASS_P (cur_param)
2235 || (DECL_P (cur_param)
2236 && TREE_READONLY (cur_param))))))
2237 warning (OPT_Wformat, "writing into constant object "
2238 "(argument %d)", arg_num);
2240 /* If there are extra type qualifiers beyond the first
2241 indirection, then this makes the types technically
2245 && (TYPE_READONLY (cur_type)
2246 || TYPE_VOLATILE (cur_type)
2247 || TYPE_RESTRICT (cur_type)))
2248 warning (OPT_Wformat, "extra type qualifiers in format "
2249 "argument (argument %d)",
2255 format_type_warning (types->name, format_start, format_length,
2256 wanted_type, types->pointer_count,
2257 types->wanted_type_name, orig_cur_type,
2263 if (i < types->pointer_count)
2266 cur_type = TYPE_MAIN_VARIANT (cur_type);
2268 /* Check whether the argument type is a character type. This leniency
2269 only applies to certain formats, flagged with 'c'.
2271 if (types->char_lenient_flag)
2272 char_type_flag = (cur_type == char_type_node
2273 || cur_type == signed_char_type_node
2274 || cur_type == unsigned_char_type_node);
2276 /* Check the type of the "real" argument, if there's a type we want. */
2277 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2279 /* If we want 'void *', allow any pointer type.
2280 (Anything else would already have got a warning.)
2281 With -pedantic, only allow pointers to void and to character
2283 if (wanted_type == void_type_node
2284 && (!pedantic || (i == 1 && char_type_flag)))
2286 /* Don't warn about differences merely in signedness, unless
2287 -pedantic. With -pedantic, warn if the type is a pointer
2288 target and not a character type, and for character types at
2289 a second level of indirection. */
2290 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2291 && TREE_CODE (cur_type) == INTEGER_TYPE
2292 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2293 && (TYPE_UNSIGNED (wanted_type)
2294 ? wanted_type == c_common_unsigned_type (cur_type)
2295 : wanted_type == c_common_signed_type (cur_type)))
2297 /* Likewise, "signed char", "unsigned char" and "char" are
2298 equivalent but the above test won't consider them equivalent. */
2299 if (wanted_type == char_type_node
2300 && (!pedantic || i < 2)
2303 /* Now we have a type mismatch. */
2304 format_type_warning (types->name, format_start, format_length,
2305 wanted_type, types->pointer_count,
2306 types->wanted_type_name, orig_cur_type, arg_num);
2311 /* Give a warning about a format argument of different type from that
2312 expected. DESCR is a description such as "field precision", or
2313 NULL for an ordinary format. For an ordinary format, FORMAT_START
2314 points to where the format starts in the format string and
2315 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2316 should have after POINTER_COUNT pointer dereferences.
2317 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2318 or NULL if the ordinary name of the type should be used. ARG_TYPE
2319 is the type of the actual argument. ARG_NUM is the number of that
2322 format_type_warning (const char *descr, const char *format_start,
2323 int format_length, tree wanted_type, int pointer_count,
2324 const char *wanted_type_name, tree arg_type, int arg_num)
2327 /* If ARG_TYPE is a typedef with a misleading name (for example,
2328 size_t but not the standard size_t expected by printf %zu), avoid
2329 printing the typedef name. */
2330 if (wanted_type_name
2331 && TYPE_NAME (arg_type)
2332 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2333 && DECL_NAME (TYPE_NAME (arg_type))
2334 && !strcmp (wanted_type_name,
2335 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2336 arg_type = TYPE_MAIN_VARIANT (arg_type);
2337 /* The format type and name exclude any '*' for pointers, so those
2338 must be formatted manually. For all the types we currently have,
2339 this is adequate, but formats taking pointers to functions or
2340 arrays would require the full type to be built up in order to
2341 print it with %T. */
2342 p = (char *) alloca (pointer_count + 2);
2343 if (pointer_count == 0)
2345 else if (c_dialect_cxx ())
2347 memset (p, '*', pointer_count);
2348 p[pointer_count] = 0;
2353 memset (p + 1, '*', pointer_count);
2354 p[pointer_count + 1] = 0;
2356 if (wanted_type_name)
2359 warning (OPT_Wformat, "%s should have type %<%s%s%>, "
2360 "but argument %d has type %qT",
2361 descr, wanted_type_name, p, arg_num, arg_type);
2363 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, "
2364 "but argument %d has type %qT",
2365 format_length, format_start, wanted_type_name, p,
2371 warning (OPT_Wformat, "%s should have type %<%T%s%>, "
2372 "but argument %d has type %qT",
2373 descr, wanted_type, p, arg_num, arg_type);
2375 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, "
2376 "but argument %d has type %qT",
2377 format_length, format_start, wanted_type, p, arg_num, arg_type);
2382 /* Given a format_char_info array FCI, and a character C, this function
2383 returns the index into the conversion_specs where that specifier's
2384 data is located. The character must exist. */
2386 find_char_info_specifier_index (const format_char_info *fci, int c)
2390 for (i = 0; fci->format_chars; i++, fci++)
2391 if (strchr (fci->format_chars, c))
2394 /* We shouldn't be looking for a non-existent specifier. */
2398 /* Given a format_length_info array FLI, and a character C, this
2399 function returns the index into the conversion_specs where that
2400 modifier's data is located. The character must exist. */
2402 find_length_info_modifier_index (const format_length_info *fli, int c)
2406 for (i = 0; fli->name; i++, fli++)
2407 if (strchr (fli->name, c))
2410 /* We shouldn't be looking for a non-existent modifier. */
2414 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2415 use in GCC's __asm_fprintf__ custom format attribute. You must
2416 have set dynamic_format_types before calling this function. */
2418 init_dynamic_asm_fprintf_info (void)
2424 format_length_info *new_asm_fprintf_length_specs;
2427 /* Find the underlying type for HOST_WIDE_INT. For the %w
2428 length modifier to work, one must have issued: "typedef
2429 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2430 prior to using that modifier. */
2431 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2434 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2437 hwi = identifier_global_value (hwi);
2438 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2440 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2443 hwi = DECL_ORIGINAL_TYPE (hwi);
2445 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2447 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2448 " or %<long long%>");
2452 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2453 new_asm_fprintf_length_specs = (format_length_info *)
2454 xmemdup (asm_fprintf_length_specs,
2455 sizeof (asm_fprintf_length_specs),
2456 sizeof (asm_fprintf_length_specs));
2458 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2459 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2460 if (hwi == long_integer_type_node)
2461 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2462 else if (hwi == long_long_integer_type_node)
2463 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2467 /* Assign the new data for use. */
2468 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2469 new_asm_fprintf_length_specs;
2473 /* Determine the type of a "locus" in the code being compiled for use
2474 in GCC's __gcc_gfc__ custom format attribute. You must have set
2475 dynamic_format_types before calling this function. */
2477 init_dynamic_gfc_info (void)
2483 static format_char_info *gfc_fci;
2485 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2486 must have declared 'locus' prior to using this attribute. If
2487 we haven't seen this declarations then you shouldn't use the
2488 specifier requiring that type. */
2489 if ((locus = maybe_get_identifier ("locus")))
2491 locus = identifier_global_value (locus);
2494 if (TREE_CODE (locus) != TYPE_DECL)
2496 error ("%<locus%> is not defined as a type");
2500 locus = TREE_TYPE (locus);
2504 /* Assign the new data for use. */
2506 /* Handle the __gcc_gfc__ format specifics. */
2508 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2509 gfc_fci = (format_char_info *)
2510 xmemdup (gcc_gfc_char_table,
2511 sizeof (gcc_gfc_char_table),
2512 sizeof (gcc_gfc_char_table));
2515 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2516 gfc_fci[i].types[0].type = &locus;
2517 gfc_fci[i].pointer_count = 1;
2522 /* Determine the types of "tree" and "location_t" in the code being
2523 compiled for use in GCC's diagnostic custom format attributes. You
2524 must have set dynamic_format_types before calling this function. */
2526 init_dynamic_diag_info (void)
2528 static tree t, loc, hwi;
2530 if (!loc || !t || !hwi)
2532 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2533 static format_length_info *diag_ls;
2536 /* For the GCC-diagnostics custom format specifiers to work, one
2537 must have declared 'tree' and/or 'location_t' prior to using
2538 those attributes. If we haven't seen these declarations then
2539 you shouldn't use the specifiers requiring these types.
2540 However we don't force a hard ICE because we may see only one
2541 or the other type. */
2542 if ((loc = maybe_get_identifier ("location_t")))
2544 loc = identifier_global_value (loc);
2547 if (TREE_CODE (loc) != TYPE_DECL)
2549 error ("%<location_t%> is not defined as a type");
2553 loc = TREE_TYPE (loc);
2557 /* We need to grab the underlying 'union tree_node' so peek into
2558 an extra type level. */
2559 if ((t = maybe_get_identifier ("tree")))
2561 t = identifier_global_value (t);
2564 if (TREE_CODE (t) != TYPE_DECL)
2566 error ("%<tree%> is not defined as a type");
2569 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2571 error ("%<tree%> is not defined as a pointer type");
2575 t = TREE_TYPE (TREE_TYPE (t));
2579 /* Find the underlying type for HOST_WIDE_INT. For the %w
2580 length modifier to work, one must have issued: "typedef
2581 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2582 prior to using that modifier. */
2583 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2585 hwi = identifier_global_value (hwi);
2588 if (TREE_CODE (hwi) != TYPE_DECL)
2590 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2595 hwi = DECL_ORIGINAL_TYPE (hwi);
2597 if (hwi != long_integer_type_node
2598 && hwi != long_long_integer_type_node)
2600 error ("%<__gcc_host_wide_int__%> is not defined"
2601 " as %<long%> or %<long long%>");
2608 /* Assign the new data for use. */
2610 /* All the GCC diag formats use the same length specs. */
2612 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2613 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2614 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2615 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2616 diag_ls = (format_length_info *)
2617 xmemdup (gcc_diag_length_specs,
2618 sizeof (gcc_diag_length_specs),
2619 sizeof (gcc_diag_length_specs));
2622 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2623 i = find_length_info_modifier_index (diag_ls, 'w');
2624 if (hwi == long_integer_type_node)
2625 diag_ls[i].index = FMT_LEN_l;
2626 else if (hwi == long_long_integer_type_node)
2627 diag_ls[i].index = FMT_LEN_ll;
2632 /* Handle the __gcc_diag__ format specifics. */
2634 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2635 diag_fci = (format_char_info *)
2636 xmemdup (gcc_diag_char_table,
2637 sizeof (gcc_diag_char_table),
2638 sizeof (gcc_diag_char_table));
2641 i = find_char_info_specifier_index (diag_fci, 'H');
2642 diag_fci[i].types[0].type = &loc;
2643 diag_fci[i].pointer_count = 1;
2647 i = find_char_info_specifier_index (diag_fci, 'J');
2648 diag_fci[i].types[0].type = &t;
2649 diag_fci[i].pointer_count = 1;
2652 /* Handle the __gcc_tdiag__ format specifics. */
2654 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2655 tdiag_fci = (format_char_info *)
2656 xmemdup (gcc_tdiag_char_table,
2657 sizeof (gcc_tdiag_char_table),
2658 sizeof (gcc_tdiag_char_table));
2661 i = find_char_info_specifier_index (tdiag_fci, 'H');
2662 tdiag_fci[i].types[0].type = &loc;
2663 tdiag_fci[i].pointer_count = 1;
2667 /* All specifiers taking a tree share the same struct. */
2668 i = find_char_info_specifier_index (tdiag_fci, 'D');
2669 tdiag_fci[i].types[0].type = &t;
2670 tdiag_fci[i].pointer_count = 1;
2671 i = find_char_info_specifier_index (tdiag_fci, 'J');
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;
2700 /* Handle the __gcc_cxxdiag__ format specifics. */
2702 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2703 cxxdiag_fci = (format_char_info *)
2704 xmemdup (gcc_cxxdiag_char_table,
2705 sizeof (gcc_cxxdiag_char_table),
2706 sizeof (gcc_cxxdiag_char_table));
2709 i = find_char_info_specifier_index (cxxdiag_fci, 'H');
2710 cxxdiag_fci[i].types[0].type = &loc;
2711 cxxdiag_fci[i].pointer_count = 1;
2715 /* All specifiers taking a tree share the same struct. */
2716 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2717 cxxdiag_fci[i].types[0].type = &t;
2718 cxxdiag_fci[i].pointer_count = 1;
2719 i = find_char_info_specifier_index (cxxdiag_fci, 'J');
2720 cxxdiag_fci[i].types[0].type = &t;
2721 cxxdiag_fci[i].pointer_count = 1;
2726 #ifdef TARGET_FORMAT_TYPES
2727 extern const format_kind_info TARGET_FORMAT_TYPES[];
2730 /* Handle a "format" attribute; arguments as in
2731 struct attribute_spec.handler. */
2733 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2734 int flags, bool *no_add_attrs)
2737 function_format_info info;
2740 #ifdef TARGET_FORMAT_TYPES
2741 /* If the target provides additional format types, we need to
2742 add them to FORMAT_TYPES at first use. */
2743 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2745 dynamic_format_types = xmalloc ((n_format_types + TARGET_N_FORMAT_TYPES)
2746 * sizeof (dynamic_format_types[0]));
2747 memcpy (dynamic_format_types, format_types_orig,
2748 sizeof (format_types_orig));
2749 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2750 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2752 format_types = dynamic_format_types;
2753 n_format_types += TARGET_N_FORMAT_TYPES;
2757 if (!decode_format_attr (args, &info, 0))
2759 *no_add_attrs = true;
2763 argument = TYPE_ARG_TYPES (type);
2766 if (!check_format_string (argument, info.format_num, flags,
2770 if (info.first_arg_num != 0)
2772 unsigned HOST_WIDE_INT arg_num = 1;
2774 /* Verify that first_arg_num points to the last arg,
2777 arg_num++, argument = TREE_CHAIN (argument);
2779 if (arg_num != info.first_arg_num)
2781 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
2782 error ("args to be formatted is not %<...%>");
2783 *no_add_attrs = true;
2789 if (info.format_type == strftime_format_type && info.first_arg_num != 0)
2791 error ("strftime formats cannot format arguments");
2792 *no_add_attrs = true;
2796 /* If this is a custom GCC-internal format type, we have to
2797 initialize certain bits a runtime. */
2798 if (info.format_type == asm_fprintf_format_type
2799 || info.format_type == gcc_gfc_format_type
2800 || info.format_type == gcc_diag_format_type
2801 || info.format_type == gcc_tdiag_format_type
2802 || info.format_type == gcc_cdiag_format_type
2803 || info.format_type == gcc_cxxdiag_format_type)
2805 /* Our first time through, we have to make sure that our
2806 format_type data is allocated dynamically and is modifiable. */
2807 if (!dynamic_format_types)
2808 format_types = dynamic_format_types = (format_kind_info *)
2809 xmemdup (format_types_orig, sizeof (format_types_orig),
2810 sizeof (format_types_orig));
2812 /* If this is format __asm_fprintf__, we have to initialize
2813 GCC's notion of HOST_WIDE_INT for checking %wd. */
2814 if (info.format_type == asm_fprintf_format_type)
2815 init_dynamic_asm_fprintf_info ();
2816 /* If this is format __gcc_gfc__, we have to initialize GCC's
2817 notion of 'locus' at runtime for %L. */
2818 else if (info.format_type == gcc_gfc_format_type)
2819 init_dynamic_gfc_info ();
2820 /* If this is one of the diagnostic attributes, then we have to
2821 initialize 'location_t' and 'tree' at runtime. */
2822 else if (info.format_type == gcc_diag_format_type
2823 || info.format_type == gcc_tdiag_format_type
2824 || info.format_type == gcc_cdiag_format_type
2825 || info.format_type == gcc_cxxdiag_format_type)
2826 init_dynamic_diag_info ();