1 /* Check calls to formatted I/O functions (-Wformat).
2 Copyright (C) 1992-2018 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
26 #include "alloc-pool.h"
27 #include "stringpool.h"
30 #include "langhooks.h"
32 #include "diagnostic.h"
33 #include "substring-locations.h"
38 /* Handle attributes associated with format checking. */
40 /* This must be in the same order as format_types, except for
41 format_type_error. Target-specific format types do not have
42 matching enum values. */
43 enum format_type { printf_format_type, asm_fprintf_format_type,
44 gcc_diag_format_type, gcc_tdiag_format_type,
45 gcc_cdiag_format_type,
46 gcc_cxxdiag_format_type, gcc_gfc_format_type,
47 gcc_objc_string_format_type,
48 format_type_error = -1};
50 struct function_format_info
52 int format_type; /* type of format (printf, scanf, etc.) */
53 unsigned HOST_WIDE_INT format_num; /* number of format argument */
54 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */
57 /* Initialized in init_dynamic_diag_info. */
58 static GTY(()) tree local_tree_type_node;
59 static GTY(()) tree local_gcall_ptr_node;
60 static GTY(()) tree locus;
62 static bool decode_format_attr (tree, function_format_info *, int);
63 static int decode_format_type (const char *);
65 static bool check_format_string (tree argument,
66 unsigned HOST_WIDE_INT format_num,
67 int flags, bool *no_add_attrs,
68 int expected_format_type);
69 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
71 static const char *convert_format_name_to_system_name (const char *attr_name);
73 static int first_target_format_type;
74 static const char *format_name (int format_num);
75 static int format_flags (int format_num);
77 /* Emit a warning as per format_warning_va, but construct the substring_loc
78 for the character at offset (CHAR_IDX - 1) within a string constant
79 FORMAT_STRING_CST at FMT_STRING_LOC. */
81 ATTRIBUTE_GCC_DIAG (5,6)
83 format_warning_at_char (location_t fmt_string_loc, tree format_string_cst,
84 int char_idx, int opt, const char *gmsgid, ...)
87 va_start (ap, gmsgid);
88 tree string_type = TREE_TYPE (format_string_cst);
90 /* The callers are of the form:
91 format_warning (format_string_loc, format_string_cst,
92 format_chars - orig_format_chars,
93 where format_chars has already been incremented, so that
94 CHAR_IDX is one character beyond where the warning should
95 be emitted. Fix it. */
98 substring_loc fmt_loc (fmt_string_loc, string_type, char_idx, char_idx,
100 bool warned = format_warning_va (fmt_loc, UNKNOWN_LOCATION, NULL, opt,
107 /* Check that we have a pointer to a string suitable for use as a format.
108 The default is to check for a char type.
109 For objective-c dialects, this is extended to include references to string
110 objects validated by objc_string_ref_type_p ().
111 Targets may also provide a string object type that can be used within c and
112 c++ and shared with their respective objective-c dialects. In this case the
113 reference to a format string is checked for validity via a hook.
115 The function returns true if strref points to any string type valid for the
116 language dialect and target. */
119 valid_stringptr_type_p (tree strref)
121 return (strref != NULL
122 && TREE_CODE (strref) == POINTER_TYPE
123 && (TYPE_MAIN_VARIANT (TREE_TYPE (strref)) == char_type_node
124 || objc_string_ref_type_p (strref)
125 || (*targetcm.string_object_ref_type_p) ((const_tree) strref)));
128 /* Handle a "format_arg" attribute; arguments as in
129 struct attribute_spec.handler. */
131 handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
132 tree args, int flags, bool *no_add_attrs)
135 tree format_num_expr = TREE_VALUE (args);
136 unsigned HOST_WIDE_INT format_num = 0;
138 if (!get_constant (format_num_expr, &format_num, 0))
140 error ("format string has invalid operand number");
141 *no_add_attrs = true;
145 if (prototype_p (type))
147 /* The format arg can be any string reference valid for the language and
148 target. We cannot be more specific in this case. */
149 if (!check_format_string (type, format_num, flags, no_add_attrs, -1))
153 if (!valid_stringptr_type_p (TREE_TYPE (type)))
155 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
156 error ("function does not return string type");
157 *no_add_attrs = true;
164 /* Verify that the format_num argument is actually a string reference suitable,
165 for the language dialect and target (in case the format attribute is in
166 error). When we know the specific reference type expected, this is also
169 check_format_string (tree fntype, unsigned HOST_WIDE_INT format_num,
170 int flags, bool *no_add_attrs, int expected_format_type)
172 unsigned HOST_WIDE_INT i;
173 bool is_objc_sref, is_target_sref, is_char_ref;
176 function_args_iterator iter;
179 FOREACH_FUNCTION_ARGS (fntype, ref, iter)
187 || !valid_stringptr_type_p (ref))
189 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
190 error ("format string argument is not a string type");
191 *no_add_attrs = true;
195 /* We only know that we want a suitable string reference. */
196 if (expected_format_type < 0)
199 /* Now check that the arg matches the expected type. */
201 (TYPE_MAIN_VARIANT (TREE_TYPE (ref)) == char_type_node);
203 fmt_flags = format_flags (expected_format_type);
204 is_objc_sref = is_target_sref = false;
206 is_objc_sref = objc_string_ref_type_p (ref);
208 if (!(fmt_flags & FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL))
211 return true; /* OK, we expected a char and found one. */
214 /* We expected a char but found an extended string type. */
216 error ("found a %qs reference but the format argument should"
217 " be a string", format_name (gcc_objc_string_format_type));
219 error ("found a %qT but the format argument should be a string",
221 *no_add_attrs = true;
226 /* We expect a string object type as the format arg. */
229 error ("format argument should be a %qs reference but"
230 " a string was found", format_name (expected_format_type));
231 *no_add_attrs = true;
235 /* We will assert that objective-c will support either its own string type
236 or the target-supplied variant. */
238 is_target_sref = (*targetcm.string_object_ref_type_p) ((const_tree) ref);
240 if (expected_format_type == (int) gcc_objc_string_format_type
241 && (is_objc_sref || is_target_sref))
244 /* We will allow a target string ref to match only itself. */
245 if (first_target_format_type
246 && expected_format_type >= first_target_format_type
251 error ("format argument should be a %qs reference",
252 format_name (expected_format_type));
253 *no_add_attrs = true;
260 /* Verify EXPR is a constant, and store its value.
261 If validated_p is true there should be no errors.
262 Returns true on success, false otherwise. */
264 get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
266 if (!tree_fits_uhwi_p (expr))
268 gcc_assert (!validated_p);
272 *value = TREE_INT_CST_LOW (expr);
277 /* Decode the arguments to a "format" attribute into a
278 function_format_info structure. It is already known that the list
279 is of the right length. If VALIDATED_P is true, then these
280 attributes have already been validated and must not be erroneous;
281 if false, it will give an error message. Returns true if the
282 attributes are successfully decoded, false otherwise. */
285 decode_format_attr (tree args, function_format_info *info, int validated_p)
287 tree format_type_id = TREE_VALUE (args);
288 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
289 tree first_arg_num_expr
290 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
292 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
294 gcc_assert (!validated_p);
295 error ("unrecognized format specifier");
300 const char *p = IDENTIFIER_POINTER (format_type_id);
302 p = convert_format_name_to_system_name (p);
304 info->format_type = decode_format_type (p);
306 if (!c_dialect_objc ()
307 && info->format_type == gcc_objc_string_format_type)
309 gcc_assert (!validated_p);
310 warning (OPT_Wformat_, "%qE is only allowed in Objective-C dialects",
312 info->format_type = format_type_error;
316 if (info->format_type == format_type_error)
318 gcc_assert (!validated_p);
319 warning (OPT_Wformat_, "%qE is an unrecognized format function type",
325 if (!get_constant (format_num_expr, &info->format_num, validated_p))
327 error ("format string has invalid operand number");
331 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
333 error ("%<...%> has invalid operand number");
337 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
339 gcc_assert (!validated_p);
340 error ("format string argument follows the args to be formatted");
347 /* Check a call to a format function against a parameter list. */
349 /* The C standard version C++ is treated as equivalent to
350 or inheriting from, for the purpose of format features supported. */
351 #define CPLUSPLUS_STD_VER (cxx_dialect < cxx11 ? STD_C94 : STD_C99)
352 /* The C standard version we are checking formats against when pedantic. */
353 #define C_STD_VER ((int) (c_dialect_cxx () \
354 ? CPLUSPLUS_STD_VER \
357 : (flag_isoc94 ? STD_C94 : STD_C89))))
358 /* The name to give to the standard version we are warning about when
359 pedantic. FEATURE_VER is the version in which the feature warned out
360 appeared, which is higher than C_STD_VER. */
361 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
362 ? (cxx_dialect < cxx11 ? "ISO C++98" \
364 : ((FEATURE_VER) == STD_EXT \
367 /* Adjust a C standard version, which may be STD_C9L, to account for
368 -Wno-long-long. Returns other standard versions unchanged. */
369 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
370 ? (warn_long_long ? STD_C99 : STD_C89) \
373 /* Enum describing the kind of specifiers present in the format and
374 requiring an argument. */
375 enum format_specifier_kind {
378 CF_KIND_FIELD_PRECISION
381 static const char *kind_descriptions[] = {
383 N_("field width specifier"),
384 N_("field precision specifier")
387 /* Structure describing details of a type expected in format checking,
388 and the type to check against it. */
389 struct format_wanted_type
391 /* The type wanted. */
393 /* The name of this type to use in diagnostics. */
394 const char *wanted_type_name;
395 /* Should be type checked just for scalar width identity. */
396 int scalar_identity_flag;
397 /* The level of indirection through pointers at which this type occurs. */
399 /* Whether, when pointer_count is 1, to allow any character type when
400 pedantic, rather than just the character or void type specified. */
401 int char_lenient_flag;
402 /* Whether the argument, dereferenced once, is written into and so the
403 argument must not be a pointer to a const-qualified type. */
405 /* Whether the argument, dereferenced once, is read from and so
406 must not be a NULL pointer. */
407 int reading_from_flag;
408 /* The kind of specifier that this type is used for. */
409 enum format_specifier_kind kind;
410 /* The starting character of the specifier. This never includes the
411 initial percent sign. */
412 const char *format_start;
413 /* The length of the specifier. */
415 /* The actual parameter to check against the wanted type. */
417 /* The argument number of that parameter. */
419 /* The offset location of this argument with respect to the format
421 unsigned int offset_loc;
422 /* The next type to check for this format conversion, or NULL if none. */
423 struct format_wanted_type *next;
426 /* Convenience macro for format_length_info meaning unused. */
427 #define NO_FMT NULL, FMT_LEN_none, STD_C89
429 static const format_length_info printf_length_specs[] =
431 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 },
432 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 },
433 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 },
434 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
435 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 },
436 { "Z", FMT_LEN_z, STD_EXT, NO_FMT, 0 },
437 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 },
438 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 },
439 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 },
440 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 },
441 { NO_FMT, NO_FMT, 0 }
444 /* Length specifiers valid for asm_fprintf. */
445 static const format_length_info asm_fprintf_length_specs[] =
447 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
448 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
449 { NO_FMT, NO_FMT, 0 }
452 /* Length specifiers valid for GCC diagnostics. */
453 static const format_length_info gcc_diag_length_specs[] =
455 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
456 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
457 { NO_FMT, NO_FMT, 0 }
460 /* The custom diagnostics all accept the same length specifiers. */
461 #define gcc_tdiag_length_specs gcc_diag_length_specs
462 #define gcc_cdiag_length_specs gcc_diag_length_specs
463 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
465 /* This differs from printf_length_specs only in that "Z" is not accepted. */
466 static const format_length_info scanf_length_specs[] =
468 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 },
469 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 },
470 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 },
471 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
472 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 },
473 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 },
474 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 },
475 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 },
476 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 },
477 { NO_FMT, NO_FMT, 0 }
481 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
482 make no sense for a format type not part of any C standard version. */
483 static const format_length_info strfmon_length_specs[] =
485 /* A GNU extension. */
486 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
487 { NO_FMT, NO_FMT, 0 }
491 /* For now, the Fortran front-end routines only use l as length modifier. */
492 static const format_length_info gcc_gfc_length_specs[] =
494 { "l", FMT_LEN_l, STD_C89, NO_FMT, 0 },
495 { NO_FMT, NO_FMT, 0 }
499 static const format_flag_spec printf_flag_specs[] =
501 { ' ', 0, 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
502 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
503 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
504 { '0', 0, 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
505 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
506 { '\'', 0, 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
507 { 'I', 0, 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
508 { 'w', 0, 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
509 { 'p', 0, 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
510 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
511 { 0, 0, 0, 0, NULL, NULL, STD_C89 }
515 static const format_flag_pair printf_flag_pairs[] =
519 { '0', 'p', 1, 'i' },
523 static const format_flag_spec asm_fprintf_flag_specs[] =
525 { ' ', 0, 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
526 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
527 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
528 { '0', 0, 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
529 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
530 { 'w', 0, 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
531 { 'p', 0, 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
532 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
533 { 0, 0, 0, 0, NULL, NULL, STD_C89 }
536 static const format_flag_pair asm_fprintf_flag_pairs[] =
540 { '0', 'p', 1, 'i' },
544 static const format_flag_pair gcc_diag_flag_pairs[] =
549 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
550 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
551 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
552 #define gcc_gfc_flag_pairs gcc_diag_flag_pairs
554 static const format_flag_spec gcc_diag_flag_specs[] =
556 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
557 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
558 { 'q', 0, 0, 1, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
559 { 'p', 0, 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
560 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
561 { 0, 0, 0, 0, NULL, NULL, STD_C89 }
564 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
565 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
566 #define gcc_cxxdiag_flag_specs gcc_diag_flag_specs
567 #define gcc_gfc_flag_specs gcc_diag_flag_specs
569 static const format_flag_spec scanf_flag_specs[] =
571 { '*', 0, 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
572 { 'a', 0, 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
573 { 'm', 0, 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT },
574 { 'w', 0, 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
575 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
576 { '\'', 0, 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
577 { 'I', 0, 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
578 { 0, 0, 0, 0, NULL, NULL, STD_C89 }
582 static const format_flag_pair scanf_flag_pairs[] =
590 static const format_flag_spec strftime_flag_specs[] =
592 { '_', 0, 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
593 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
594 { '0', 0, 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
595 { '^', 0, 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
596 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
597 { 'w', 0, 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
598 { 'E', 0, 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
599 { 'O', 0, 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
600 { 'O', 'o', 0, 0, NULL, N_("the 'O' modifier"), STD_EXT },
601 { 0, 0, 0, 0, NULL, NULL, STD_C89 }
605 static const format_flag_pair strftime_flag_pairs[] =
616 static const format_flag_spec strfmon_flag_specs[] =
618 { '=', 0, 1, 0, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
619 { '^', 0, 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
620 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
621 { '(', 0, 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
622 { '!', 0, 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
623 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
624 { 'w', 0, 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
625 { '#', 0, 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
626 { 'p', 0, 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
627 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
628 { 0, 0, 0, 0, NULL, NULL, STD_C89 }
631 static const format_flag_pair strfmon_flag_pairs[] =
638 static const format_char_info print_char_table[] =
640 /* C89 conversion specifiers. */
641 { "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 },
642 { "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 },
643 { "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 },
644 { "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 },
645 { "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 },
646 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
647 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
648 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
649 { "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 },
650 /* C99 conversion specifiers. */
651 { "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 },
652 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
653 /* X/Open conversion specifiers. */
654 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
655 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
656 /* GNU conversion specifiers. */
657 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
658 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
661 static const format_char_info asm_fprintf_char_table[] =
663 /* C89 conversion specifiers. */
664 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL },
665 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL },
666 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL },
667 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
668 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
670 /* asm_fprintf conversion specifiers. */
671 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL },
672 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL },
673 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL },
674 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL },
675 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL },
676 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
677 { "z", 0, STD_C89, NOARGUMENTS, "", "", NULL },
678 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
679 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
682 static const format_char_info gcc_diag_char_table[] =
684 /* C89 conversion specifiers. */
685 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
686 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
687 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
688 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
689 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
690 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
692 /* Custom conversion specifiers. */
694 /* G requires a "gcall*" argument at runtime. */
695 { "G", 1, STD_C89, { T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
696 /* K requires a "tree" argument at runtime. */
697 { "K", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
699 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "//cR", NULL },
700 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL },
701 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL },
702 { "'" , 0, STD_C89, NOARGUMENTS, "", "", NULL },
703 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL },
704 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
705 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
708 static const format_char_info gcc_tdiag_char_table[] =
710 /* C89 conversion specifiers. */
711 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
712 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
713 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
714 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
715 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
716 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
718 /* Custom conversion specifiers. */
720 /* These will require a "tree" at runtime. */
721 { "DFTV", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "'", NULL },
722 { "E", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
723 { "K", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
725 /* G requires a "gcall*" argument at runtime. */
726 { "G", 1, STD_C89, { T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
728 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
730 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "/cR", NULL },
731 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL },
732 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL },
733 { "'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
734 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL },
735 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
736 { "Z", 1, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", &gcc_tdiag_char_table[0] },
737 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
740 static const format_char_info gcc_cdiag_char_table[] =
742 /* C89 conversion specifiers. */
743 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
744 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
745 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
746 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
747 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
748 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
750 /* Custom conversion specifiers. */
752 /* These will require a "tree" at runtime. */
753 { "DFTV", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "'", NULL },
754 { "E", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
755 { "K", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
757 /* G requires a "gcall*" argument at runtime. */
758 { "G", 1, STD_C89, { T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
760 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
762 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "/cR", NULL },
763 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL },
764 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL },
765 { "'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
766 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL },
767 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
768 { "Z", 1, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", &gcc_tdiag_char_table[0] },
769 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
772 static const format_char_info gcc_cxxdiag_char_table[] =
774 /* C89 conversion specifiers. */
775 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
776 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
777 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
778 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
779 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
780 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
782 /* Custom conversion specifiers. */
784 /* These will require a "tree" at runtime. */
785 { "ADFHISTVX",1,STD_C89,{ T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "'", NULL },
786 { "E", 1,STD_C89,{ T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
787 { "K", 1, STD_C89,{ T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
788 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
790 /* G requires a "gcall*" argument at runtime. */
791 { "G", 1, STD_C89,{ T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
793 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
794 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
796 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "/cR", NULL },
797 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL },
798 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL },
799 { "'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
800 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL },
801 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
802 { "Z", 1, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", &gcc_tdiag_char_table[0] },
803 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
806 static const format_char_info gcc_gfc_char_table[] =
808 /* C89 conversion specifiers. */
809 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
810 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
811 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
812 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "cR", NULL },
814 /* gfc conversion specifiers. */
816 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
818 /* This will require a "locus" at runtime. */
819 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
821 /* These will require nothing. */
822 { "<>",0, STD_C89, NOARGUMENTS, "", "", NULL },
823 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
826 static const format_char_info scan_char_table[] =
828 /* C89 conversion specifiers. */
829 { "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 },
830 { "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 },
831 { "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 },
832 { "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 },
833 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL },
834 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL },
835 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL },
836 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
837 { "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 },
838 /* C99 conversion specifiers. */
839 { "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 },
840 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
841 /* X/Open conversion specifiers. */
842 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL },
843 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL },
844 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
847 static const format_char_info time_char_table[] =
849 /* C89 conversion specifiers. */
850 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
851 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
852 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
853 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
854 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
855 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
856 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
857 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
858 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
859 /* C99 conversion specifiers. */
860 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
861 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
862 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
863 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
864 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
865 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
866 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
867 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
868 /* GNU conversion specifiers. */
869 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
870 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
871 #if 1 /* DragonFly base: strftime() %+ specifier. */
872 { "+", 0, STD_EXT, NOLENGTHS, "E", "3", NULL },
874 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
877 static const format_char_info monetary_char_table[] =
879 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
880 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
883 /* This must be in the same order as enum format_type. */
884 static const format_kind_info format_types_orig[] =
886 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
887 printf_flag_specs, printf_flag_pairs,
888 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
889 'w', 0, 'p', 0, 'L', 0,
890 &integer_type_node, &integer_type_node
892 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
893 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
894 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
895 'w', 0, 'p', 0, 'L', 0,
898 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+#", NULL,
899 gcc_diag_flag_specs, gcc_diag_flag_pairs,
900 FMT_FLAG_ARG_CONVERT,
901 0, 0, 'p', 0, 'L', 0,
902 NULL, &integer_type_node
904 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+#", NULL,
905 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
906 FMT_FLAG_ARG_CONVERT,
907 0, 0, 'p', 0, 'L', 0,
908 NULL, &integer_type_node
910 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+#", NULL,
911 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
912 FMT_FLAG_ARG_CONVERT,
913 0, 0, 'p', 0, 'L', 0,
914 NULL, &integer_type_node
916 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
917 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
918 FMT_FLAG_ARG_CONVERT,
919 0, 0, 'p', 0, 'L', 0,
920 NULL, &integer_type_node
922 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "q+#", NULL,
923 gcc_gfc_flag_specs, gcc_gfc_flag_pairs,
924 FMT_FLAG_ARG_CONVERT,
928 { "NSString", NULL, NULL, NULL, NULL,
930 FMT_FLAG_ARG_CONVERT|FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL, 0, 0, 0, 0, 0, 0,
933 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
934 scanf_flag_specs, scanf_flag_pairs,
935 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
936 'w', 0, 0, '*', 'L', 'm',
939 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
940 strftime_flag_specs, strftime_flag_pairs,
941 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
944 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
945 strfmon_flag_specs, strfmon_flag_pairs,
946 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
951 /* This layer of indirection allows GCC to reassign format_types with
952 new data if necessary, while still allowing the original data to be
954 static const format_kind_info *format_types = format_types_orig;
955 /* We can modify this one. We also add target-specific format types
956 to the end of the array. */
957 static format_kind_info *dynamic_format_types;
959 static int n_format_types = ARRAY_SIZE (format_types_orig);
961 /* Structure detailing the results of checking a format function call
962 where the format expression may be a conditional expression with
963 many leaves resulting from nested conditional expressions. */
964 struct format_check_results
966 /* Number of leaves of the format argument that could not be checked
967 as they were not string literals. */
968 int number_non_literal;
969 /* Number of leaves of the format argument that were null pointers or
970 string literals, but had extra format arguments. */
971 int number_extra_args;
972 location_t extra_arg_loc;
973 /* Number of leaves of the format argument that were null pointers or
974 string literals, but had extra format arguments and used $ operand
976 int number_dollar_extra_args;
977 /* Number of leaves of the format argument that were wide string
980 /* Number of leaves of the format argument that were empty strings. */
982 /* Number of leaves of the format argument that were unterminated
984 int number_unterminated;
985 /* Number of leaves of the format argument that were not counted above. */
987 /* Location of the format string. */
988 location_t format_string_loc;
991 struct format_check_context
993 format_check_results *res;
994 function_format_info *info;
996 vec<location_t> *arglocs;
999 /* Return the format name (as specified in the original table) for the format
1000 type indicated by format_num. */
1002 format_name (int format_num)
1004 if (format_num >= 0 && format_num < n_format_types)
1005 return format_types[format_num].name;
1009 /* Return the format flags (as specified in the original table) for the format
1010 type indicated by format_num. */
1012 format_flags (int format_num)
1014 if (format_num >= 0 && format_num < n_format_types)
1015 return format_types[format_num].flags;
1019 static void check_format_info (function_format_info *, tree,
1021 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
1022 static void check_format_info_main (format_check_results *,
1023 function_format_info *, const char *,
1026 unsigned HOST_WIDE_INT,
1027 object_allocator<format_wanted_type> &,
1030 static void init_dollar_format_checking (int, tree);
1031 static int maybe_read_dollar_number (const char **, int,
1032 tree, tree *, const format_kind_info *);
1033 static bool avoid_dollar_number (const char *);
1034 static void finish_dollar_format_checking (format_check_results *, int);
1036 static const format_flag_spec *get_flag_spec (const format_flag_spec *,
1039 static void check_format_types (const substring_loc &fmt_loc,
1040 format_wanted_type *,
1041 const format_kind_info *fki,
1042 int offset_to_type_start,
1043 char conversion_char,
1044 vec<location_t> *arglocs);
1045 static void format_type_warning (const substring_loc &fmt_loc,
1046 location_t param_loc,
1047 format_wanted_type *, tree,
1049 const format_kind_info *fki,
1050 int offset_to_type_start,
1051 char conversion_char);
1053 /* Decode a format type from a string, returning the type, or
1054 format_type_error if not valid, in which case the caller should print an
1057 decode_format_type (const char *s)
1062 s = convert_format_name_to_system_name (s);
1064 for (i = 0; i < n_format_types; i++)
1067 if (!strcmp (s, format_types[i].name))
1069 alen = strlen (format_types[i].name);
1070 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
1071 && s[slen - 1] == '_' && s[slen - 2] == '_'
1072 && !strncmp (s + 2, format_types[i].name, alen))
1075 return format_type_error;
1079 /* Check the argument list of a call to printf, scanf, etc.
1080 ATTRS are the attributes on the function type. There are NARGS argument
1081 values in the array ARGARRAY.
1082 Also, if -Wsuggest-attribute=format,
1083 warn for calls to vprintf or vscanf in functions with no such format
1084 attribute themselves. */
1087 check_function_format (tree attrs, int nargs, tree *argarray,
1088 vec<location_t> *arglocs)
1092 /* See if this function has any format attributes. */
1093 for (a = attrs; a; a = TREE_CHAIN (a))
1095 if (is_attribute_p ("format", TREE_PURPOSE (a)))
1097 /* Yup; check it. */
1098 function_format_info info;
1099 decode_format_attr (TREE_VALUE (a), &info, /*validated=*/true);
1102 /* FIXME: Rewrite all the internal functions in this file
1103 to use the ARGARRAY directly instead of constructing this
1105 tree params = NULL_TREE;
1107 for (i = nargs - 1; i >= 0; i--)
1108 params = tree_cons (NULL_TREE, argarray[i], params);
1109 check_format_info (&info, params, arglocs);
1112 /* Attempt to detect whether the current function might benefit
1113 from the format attribute if the called function is decorated
1114 with it. Avoid using calls with string literal formats for
1115 guidance since those are unlikely to be viable candidates. */
1116 if (warn_suggest_attribute_format
1117 && current_function_decl != NULL_TREE
1118 && info.first_arg_num == 0
1119 && (format_types[info.format_type].flags
1120 & (int) FMT_FLAG_ARG_CONVERT)
1121 /* c_strlen will fail for a function parameter but succeed
1122 for a literal or constant array. */
1123 && !c_strlen (argarray[info.format_num - 1], 1))
1126 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
1129 if (is_attribute_p ("format", TREE_PURPOSE (c))
1130 && (decode_format_type (IDENTIFIER_POINTER
1131 (TREE_VALUE (TREE_VALUE (c))))
1132 == info.format_type))
1136 /* Check if the current function has a parameter to which
1137 the format attribute could be attached; if not, it
1138 can't be a candidate for a format attribute, despite
1139 the vprintf-like or vscanf-like call. */
1141 for (args = DECL_ARGUMENTS (current_function_decl);
1143 args = DECL_CHAIN (args))
1145 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
1146 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
1151 warning (OPT_Wsuggest_attribute_format, "function %qD "
1152 "might be a candidate for %qs format attribute",
1153 current_function_decl,
1154 format_types[info.format_type].name);
1162 /* Variables used by the checking of $ operand number formats. */
1163 static char *dollar_arguments_used = NULL;
1164 static char *dollar_arguments_pointer_p = NULL;
1165 static int dollar_arguments_alloc = 0;
1166 static int dollar_arguments_count;
1167 static int dollar_first_arg_num;
1168 static int dollar_max_arg_used;
1169 static int dollar_format_warned;
1171 /* Initialize the checking for a format string that may contain $
1172 parameter number specifications; we will need to keep track of whether
1173 each parameter has been used. FIRST_ARG_NUM is the number of the first
1174 argument that is a parameter to the format, or 0 for a vprintf-style
1175 function; PARAMS is the list of arguments starting at this argument. */
1178 init_dollar_format_checking (int first_arg_num, tree params)
1180 tree oparams = params;
1182 dollar_first_arg_num = first_arg_num;
1183 dollar_arguments_count = 0;
1184 dollar_max_arg_used = 0;
1185 dollar_format_warned = 0;
1186 if (first_arg_num > 0)
1190 dollar_arguments_count++;
1191 params = TREE_CHAIN (params);
1194 if (dollar_arguments_alloc < dollar_arguments_count)
1196 free (dollar_arguments_used);
1197 free (dollar_arguments_pointer_p);
1198 dollar_arguments_alloc = dollar_arguments_count;
1199 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
1200 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
1202 if (dollar_arguments_alloc)
1204 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1205 if (first_arg_num > 0)
1211 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1213 params = TREE_CHAIN (params);
1221 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1222 is set, it is an error if one is not found; otherwise, it is OK. If
1223 such a number is found, check whether it is within range and mark that
1224 numbered operand as being used for later checking. Returns the operand
1225 number if found and within range, zero if no such number was found and
1226 this is OK, or -1 on error. PARAMS points to the first operand of the
1227 format; PARAM_PTR is made to point to the parameter referred to. If
1228 a $ format is found, *FORMAT is updated to point just after it. */
1231 maybe_read_dollar_number (const char **format,
1232 int dollar_needed, tree params, tree *param_ptr,
1233 const format_kind_info *fki)
1237 const char *fcp = *format;
1238 if (!ISDIGIT (*fcp))
1242 warning (OPT_Wformat_, "missing $ operand number in format");
1250 while (ISDIGIT (*fcp))
1253 nargnum = 10 * argnum + (*fcp - '0');
1254 if (nargnum < 0 || nargnum / 10 != argnum)
1263 warning (OPT_Wformat_, "missing $ operand number in format");
1270 if (pedantic && !dollar_format_warned)
1272 warning (OPT_Wformat_, "%s does not support %%n$ operand number formats",
1273 C_STD_NAME (STD_EXT));
1274 dollar_format_warned = 1;
1276 if (overflow_flag || argnum == 0
1277 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1279 warning (OPT_Wformat_, "operand number out of range in format");
1282 if (argnum > dollar_max_arg_used)
1283 dollar_max_arg_used = argnum;
1284 /* For vprintf-style functions we may need to allocate more memory to
1285 track which arguments are used. */
1286 while (dollar_arguments_alloc < dollar_max_arg_used)
1289 nalloc = 2 * dollar_arguments_alloc + 16;
1290 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1292 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1294 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1295 nalloc - dollar_arguments_alloc);
1296 dollar_arguments_alloc = nalloc;
1298 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1299 && dollar_arguments_used[argnum - 1] == 1)
1301 dollar_arguments_used[argnum - 1] = 2;
1302 warning (OPT_Wformat_, "format argument %d used more than once in %s format",
1306 dollar_arguments_used[argnum - 1] = 1;
1307 if (dollar_first_arg_num)
1310 *param_ptr = params;
1311 for (i = 1; i < argnum && *param_ptr != 0; i++)
1312 *param_ptr = TREE_CHAIN (*param_ptr);
1314 /* This case shouldn't be caught here. */
1315 gcc_assert (*param_ptr);
1322 /* Ensure that FORMAT does not start with a decimal number followed by
1323 a $; give a diagnostic and return true if it does, false otherwise. */
1326 avoid_dollar_number (const char *format)
1328 if (!ISDIGIT (*format))
1330 while (ISDIGIT (*format))
1334 warning (OPT_Wformat_, "$ operand number used after format without operand number");
1341 /* Finish the checking for a format string that used $ operand number formats
1342 instead of non-$ formats. We check for unused operands before used ones
1343 (a serious error, since the implementation of the format function
1344 can't know what types to pass to va_arg to find the later arguments).
1345 and for unused operands at the end of the format (if we know how many
1346 arguments the format had, so not for vprintf). If there were operand
1347 numbers out of range on a non-vprintf-style format, we won't have reached
1348 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1352 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1355 bool found_pointer_gap = false;
1356 for (i = 0; i < dollar_max_arg_used; i++)
1358 if (!dollar_arguments_used[i])
1360 if (pointer_gap_ok && (dollar_first_arg_num == 0
1361 || dollar_arguments_pointer_p[i]))
1362 found_pointer_gap = true;
1364 warning_at (res->format_string_loc, OPT_Wformat_,
1365 "format argument %d unused before used argument %d in $-style format",
1366 i + 1, dollar_max_arg_used);
1369 if (found_pointer_gap
1370 || (dollar_first_arg_num
1371 && dollar_max_arg_used < dollar_arguments_count))
1373 res->number_other--;
1374 res->number_dollar_extra_args++;
1379 /* Retrieve the specification for a format flag. SPEC contains the
1380 specifications for format flags for the applicable kind of format.
1381 FLAG is the flag in question. If PREDICATES is NULL, the basic
1382 spec for that flag must be retrieved and must exist. If
1383 PREDICATES is not NULL, it is a string listing possible predicates
1384 for the spec entry; if an entry predicated on any of these is
1385 found, it is returned, otherwise NULL is returned. */
1387 static const format_flag_spec *
1388 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1391 for (i = 0; spec[i].flag_char != 0; i++)
1393 if (spec[i].flag_char != flag)
1395 if (predicates != NULL)
1397 if (spec[i].predicate != 0
1398 && strchr (predicates, spec[i].predicate) != 0)
1401 else if (spec[i].predicate == 0)
1404 gcc_assert (predicates);
1409 /* Check the argument list of a call to printf, scanf, etc.
1410 INFO points to the function_format_info structure.
1411 PARAMS is the list of argument values. */
1414 check_format_info (function_format_info *info, tree params,
1415 vec<location_t> *arglocs)
1417 format_check_context format_ctx;
1418 unsigned HOST_WIDE_INT arg_num;
1420 format_check_results res;
1421 /* Skip to format argument. If the argument isn't available, there's
1422 no work for us to do; prototype checking will catch the problem. */
1423 for (arg_num = 1; ; ++arg_num)
1427 if (arg_num == info->format_num)
1429 params = TREE_CHAIN (params);
1431 format_tree = TREE_VALUE (params);
1432 params = TREE_CHAIN (params);
1433 if (format_tree == 0)
1436 res.number_non_literal = 0;
1437 res.number_extra_args = 0;
1438 res.extra_arg_loc = UNKNOWN_LOCATION;
1439 res.number_dollar_extra_args = 0;
1440 res.number_wide = 0;
1441 res.number_empty = 0;
1442 res.number_unterminated = 0;
1443 res.number_other = 0;
1444 res.format_string_loc = input_location;
1446 format_ctx.res = &res;
1447 format_ctx.info = info;
1448 format_ctx.params = params;
1449 format_ctx.arglocs = arglocs;
1451 check_function_arguments_recurse (check_format_arg, &format_ctx,
1452 format_tree, arg_num);
1454 location_t loc = format_ctx.res->format_string_loc;
1456 if (res.number_non_literal > 0)
1458 /* Functions taking a va_list normally pass a non-literal format
1459 string. These functions typically are declared with
1460 first_arg_num == 0, so avoid warning in those cases. */
1461 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1463 /* For strftime-like formats, warn for not checking the format
1464 string; but there are no arguments to check. */
1465 warning_at (loc, OPT_Wformat_nonliteral,
1466 "format not a string literal, format string not checked");
1468 else if (info->first_arg_num != 0)
1470 /* If there are no arguments for the format at all, we may have
1471 printf (foo) which is likely to be a security hole. */
1472 while (arg_num + 1 < info->first_arg_num)
1476 params = TREE_CHAIN (params);
1479 if (params == 0 && warn_format_security)
1480 warning_at (loc, OPT_Wformat_security,
1481 "format not a string literal and no format arguments");
1482 else if (params == 0 && warn_format_nonliteral)
1483 warning_at (loc, OPT_Wformat_nonliteral,
1484 "format not a string literal and no format arguments");
1486 warning_at (loc, OPT_Wformat_nonliteral,
1487 "format not a string literal, argument types not checked");
1491 /* If there were extra arguments to the format, normally warn. However,
1492 the standard does say extra arguments are ignored, so in the specific
1493 case where we have multiple leaves (conditional expressions or
1494 ngettext) allow extra arguments if at least one leaf didn't have extra
1495 arguments, but was otherwise OK (either non-literal or checked OK).
1496 If the format is an empty string, this should be counted similarly to the
1497 case of extra format arguments. */
1498 if (res.number_extra_args > 0 && res.number_non_literal == 0
1499 && res.number_other == 0)
1501 if (res.extra_arg_loc == UNKNOWN_LOCATION)
1502 res.extra_arg_loc = loc;
1503 warning_at (res.extra_arg_loc, OPT_Wformat_extra_args,
1504 "too many arguments for format");
1506 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1507 && res.number_other == 0)
1508 warning_at (loc, OPT_Wformat_extra_args, "unused arguments in $-style format");
1509 if (res.number_empty > 0 && res.number_non_literal == 0
1510 && res.number_other == 0)
1511 warning_at (loc, OPT_Wformat_zero_length, "zero-length %s format string",
1512 format_types[info->format_type].name);
1514 if (res.number_wide > 0)
1515 warning_at (loc, OPT_Wformat_, "format is a wide character string");
1517 if (res.number_unterminated > 0)
1518 warning_at (loc, OPT_Wformat_, "unterminated format string");
1521 /* Callback from check_function_arguments_recurse to check a
1522 format string. FORMAT_TREE is the format parameter. ARG_NUM
1523 is the number of the format argument. CTX points to a
1524 format_check_context. */
1527 check_format_arg (void *ctx, tree format_tree,
1528 unsigned HOST_WIDE_INT arg_num)
1530 format_check_context *format_ctx = (format_check_context *) ctx;
1531 format_check_results *res = format_ctx->res;
1532 function_format_info *info = format_ctx->info;
1533 tree params = format_ctx->params;
1534 vec<location_t> *arglocs = format_ctx->arglocs;
1537 HOST_WIDE_INT offset;
1538 const char *format_chars;
1539 tree array_size = 0;
1542 location_t fmt_param_loc = EXPR_LOC_OR_LOC (format_tree, input_location);
1544 /* Pull out a constant value if the front end didn't, and handle location
1546 format_tree = fold_for_warn (format_tree);
1547 STRIP_NOPS (format_tree);
1549 if (integer_zerop (format_tree))
1551 /* Skip to first argument to check, so we can see if this format
1552 has any arguments (it shouldn't). */
1553 while (arg_num + 1 < info->first_arg_num)
1557 params = TREE_CHAIN (params);
1562 res->number_other++;
1565 if (res->number_extra_args == 0)
1566 res->extra_arg_loc = EXPR_LOC_OR_LOC (TREE_VALUE (params),
1568 res->number_extra_args++;
1574 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1578 arg0 = TREE_OPERAND (format_tree, 0);
1579 arg1 = TREE_OPERAND (format_tree, 1);
1582 if (TREE_CODE (arg1) == INTEGER_CST)
1586 res->number_non_literal++;
1589 /* POINTER_PLUS_EXPR offsets are to be interpreted signed. */
1590 if (!cst_and_fits_in_hwi (arg1))
1592 res->number_non_literal++;
1595 offset = int_cst_value (arg1);
1597 if (TREE_CODE (format_tree) != ADDR_EXPR)
1599 res->number_non_literal++;
1602 res->format_string_loc = EXPR_LOC_OR_LOC (format_tree, input_location);
1603 format_tree = TREE_OPERAND (format_tree, 0);
1604 if (format_types[info->format_type].flags
1605 & (int) FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL)
1607 bool objc_str = (info->format_type == gcc_objc_string_format_type);
1608 /* We cannot examine this string here - but we can check that it is
1610 if (TREE_CODE (format_tree) != CONST_DECL
1611 || !((objc_str && objc_string_ref_type_p (TREE_TYPE (format_tree)))
1612 || (*targetcm.string_object_ref_type_p)
1613 ((const_tree) TREE_TYPE (format_tree))))
1615 res->number_non_literal++;
1618 /* Skip to first argument to check. */
1619 while (arg_num + 1 < info->first_arg_num)
1623 params = TREE_CHAIN (params);
1626 /* So, we have a valid literal string object and one or more params.
1627 We need to use an external helper to parse the string into format
1628 info. For Objective-C variants we provide the resource within the
1629 objc tree, for target variants, via a hook. */
1631 objc_check_format_arg (format_tree, params);
1632 else if (targetcm.check_string_object_format_arg)
1633 (*targetcm.check_string_object_format_arg) (format_tree, params);
1634 /* Else we can't handle it and retire quietly. */
1637 if (TREE_CODE (format_tree) == ARRAY_REF
1638 && tree_fits_shwi_p (TREE_OPERAND (format_tree, 1))
1639 && (offset += tree_to_shwi (TREE_OPERAND (format_tree, 1))) >= 0)
1640 format_tree = TREE_OPERAND (format_tree, 0);
1643 res->number_non_literal++;
1646 if (VAR_P (format_tree)
1647 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1648 && (array_init = decl_constant_value (format_tree)) != format_tree
1649 && TREE_CODE (array_init) == STRING_CST)
1651 /* Extract the string constant initializer. Note that this may include
1652 a trailing NUL character that is not in the array (e.g.
1653 const char a[3] = "foo";). */
1654 array_size = DECL_SIZE_UNIT (format_tree);
1655 format_tree = array_init;
1657 if (TREE_CODE (format_tree) != STRING_CST)
1659 res->number_non_literal++;
1662 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1667 format_chars = TREE_STRING_POINTER (format_tree);
1668 format_length = TREE_STRING_LENGTH (format_tree);
1669 if (array_size != 0)
1671 /* Variable length arrays can't be initialized. */
1672 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1674 if (tree_fits_shwi_p (array_size))
1676 HOST_WIDE_INT array_size_value = tree_to_shwi (array_size);
1677 if (array_size_value > 0
1678 && array_size_value == (int) array_size_value
1679 && format_length > array_size_value)
1680 format_length = array_size_value;
1685 if (offset >= format_length)
1687 res->number_non_literal++;
1690 format_chars += offset;
1691 format_length -= offset;
1693 if (format_length < 1 || format_chars[--format_length] != 0)
1695 res->number_unterminated++;
1698 if (format_length == 0)
1700 res->number_empty++;
1704 /* Skip to first argument to check. */
1705 while (arg_num + 1 < info->first_arg_num)
1709 params = TREE_CHAIN (params);
1712 /* Provisionally increment res->number_other; check_format_info_main
1713 will decrement it if it finds there are extra arguments, but this way
1714 need not adjust it for every return. */
1715 res->number_other++;
1716 object_allocator <format_wanted_type> fwt_pool ("format_wanted_type pool");
1717 check_format_info_main (res, info, format_chars, fmt_param_loc, format_tree,
1718 format_length, params, arg_num, fwt_pool, arglocs);
1721 /* Support class for argument_parser and check_format_info_main.
1722 Tracks any flag characters that have been applied to the
1723 current argument. */
1729 bool has_char_p (char ch) const;
1730 void add_char (char ch);
1731 void validate (const format_kind_info *fki,
1732 const format_char_info *fci,
1733 const format_flag_spec *flag_specs,
1734 const char * const format_chars,
1735 tree format_string_cst,
1736 location_t format_string_loc,
1737 const char * const orig_format_chars,
1740 int get_alloc_flag (const format_kind_info *fki);
1741 int assignment_suppression_p (const format_kind_info *fki);
1744 char m_flag_chars[256];
1747 /* Support struct for argument_parser and check_format_info_main.
1748 Encapsulates any length modifier applied to the current argument. */
1750 struct length_modifier
1753 : chars (NULL), val (FMT_LEN_none), std (STD_C89),
1754 scalar_identity_flag (0)
1758 length_modifier (const char *chars_,
1759 enum format_lengths val_,
1760 enum format_std_version std_,
1761 int scalar_identity_flag_)
1762 : chars (chars_), val (val_), std (std_),
1763 scalar_identity_flag (scalar_identity_flag_)
1768 enum format_lengths val;
1769 enum format_std_version std;
1770 int scalar_identity_flag;
1773 /* Parsing one argument within a format string. */
1775 class argument_parser
1778 argument_parser (function_format_info *info, const char *&format_chars,
1779 tree format_string_cst,
1780 const char * const orig_format_chars,
1781 location_t format_string_loc, flag_chars_t &flag_chars,
1782 int &has_operand_number, tree first_fillin_param,
1783 object_allocator <format_wanted_type> &fwt_pool_,
1784 vec<location_t> *arglocs);
1786 bool read_any_dollar ();
1788 bool read_format_flags ();
1791 read_any_format_width (tree ¶ms,
1792 unsigned HOST_WIDE_INT &arg_num);
1795 read_any_format_left_precision ();
1798 read_any_format_precision (tree ¶ms,
1799 unsigned HOST_WIDE_INT &arg_num);
1801 void handle_alloc_chars ();
1803 length_modifier read_any_length_modifier ();
1805 void read_any_other_modifier ();
1807 const format_char_info *find_format_char_info (char format_char);
1810 validate_flag_pairs (const format_char_info *fci,
1814 give_y2k_warnings (const format_char_info *fci,
1817 void parse_any_scan_set (const format_char_info *fci);
1819 bool handle_conversions (const format_char_info *fci,
1820 const length_modifier &len_modifier,
1822 const char *&wanted_type_name,
1823 unsigned HOST_WIDE_INT &arg_num,
1828 check_argument_type (const format_char_info *fci,
1829 const length_modifier &len_modifier,
1831 const char *&wanted_type_name,
1832 const bool suppressed,
1833 unsigned HOST_WIDE_INT &arg_num,
1835 const int alloc_flag,
1836 const char * const format_start,
1837 const char * const type_start,
1838 location_t fmt_param_loc,
1839 char conversion_char);
1842 const function_format_info *const info;
1843 const format_kind_info * const fki;
1844 const format_flag_spec * const flag_specs;
1845 const char *start_of_this_format;
1846 const char *&format_chars;
1847 const tree format_string_cst;
1848 const char * const orig_format_chars;
1849 const location_t format_string_loc;
1850 object_allocator <format_wanted_type> &fwt_pool;
1851 flag_chars_t &flag_chars;
1853 tree main_arg_params;
1854 int &has_operand_number;
1855 const tree first_fillin_param;
1856 format_wanted_type width_wanted_type;
1857 format_wanted_type precision_wanted_type;
1859 format_wanted_type main_wanted_type;
1861 format_wanted_type *first_wanted_type;
1862 format_wanted_type *last_wanted_type;
1863 vec<location_t> *arglocs;
1866 /* flag_chars_t's constructor. */
1868 flag_chars_t::flag_chars_t ()
1870 m_flag_chars[0] = 0;
1873 /* Has CH been seen as a flag within the current argument? */
1876 flag_chars_t::has_char_p (char ch) const
1878 return strchr (m_flag_chars, ch) != 0;
1881 /* Add CH to the flags seen within the current argument. */
1884 flag_chars_t::add_char (char ch)
1886 int i = strlen (m_flag_chars);
1887 m_flag_chars[i++] = ch;
1888 m_flag_chars[i] = 0;
1891 /* Validate the individual flags used, removing any that are invalid. */
1894 flag_chars_t::validate (const format_kind_info *fki,
1895 const format_char_info *fci,
1896 const format_flag_spec *flag_specs,
1897 const char * const format_chars,
1898 tree format_string_cst,
1899 location_t format_string_loc,
1900 const char * const orig_format_chars,
1906 bool quotflag = false;
1908 for (i = 0; m_flag_chars[i] != 0; i++)
1910 const format_flag_spec *s = get_flag_spec (flag_specs,
1911 m_flag_chars[i], NULL);
1912 m_flag_chars[i - d] = m_flag_chars[i];
1913 if (m_flag_chars[i] == fki->length_code_char)
1916 /* Remember if a quoting flag is seen. */
1917 quotflag |= s->quoting;
1919 if (strchr (fci->flag_chars, m_flag_chars[i]) == 0)
1921 format_warning_at_char (format_string_loc, format_string_cst,
1922 format_chars - orig_format_chars,
1924 "%s used with %<%%%c%> %s format",
1925 _(s->name), format_char, fki->name);
1931 const format_flag_spec *t;
1932 if (ADJ_STD (s->std) > C_STD_VER)
1933 warning_at (format_string_loc, OPT_Wformat_,
1934 "%s does not support %s",
1935 C_STD_NAME (s->std), _(s->long_name));
1936 t = get_flag_spec (flag_specs, m_flag_chars[i], fci->flags2);
1937 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
1939 const char *long_name = (t->long_name != NULL
1942 if (ADJ_STD (t->std) > C_STD_VER)
1943 warning_at (format_string_loc, OPT_Wformat_,
1944 "%s does not support %s with"
1945 " the %<%%%c%> %s format",
1946 C_STD_NAME (t->std), _(long_name),
1947 format_char, fki->name);
1951 /* Detect quoting directives used within a quoted sequence, such
1952 as GCC's "%<...%qE". */
1953 if (quoted && s->quoting)
1955 format_warning_at_char (format_string_loc, format_string_cst,
1956 format_chars - orig_format_chars - 1,
1958 "%s used within a quoted sequence",
1962 m_flag_chars[i - d] = 0;
1966 && strchr (fci->flags2, '\''))
1968 format_warning_at_char (format_string_loc, format_string_cst,
1969 format_chars - orig_format_chars,
1971 "%qc conversion used unquoted",
1976 /* Determine if an assignment-allocation has been set, requiring
1977 an extra char ** for writing back a dynamically-allocated char *.
1978 This is for handling the optional 'm' character in scanf. */
1981 flag_chars_t::get_alloc_flag (const format_kind_info *fki)
1983 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1984 && has_char_p ('a'))
1986 if (fki->alloc_char && has_char_p (fki->alloc_char))
1991 /* Determine if an assignment-suppression character was seen.
1992 ('*' in scanf, for discarding the converted input). */
1995 flag_chars_t::assignment_suppression_p (const format_kind_info *fki)
1997 if (fki->suppression_char
1998 && has_char_p (fki->suppression_char))
2003 /* Constructor for argument_parser. Initialize for parsing one
2004 argument within a format string. */
2007 argument_parser (function_format_info *info_, const char *&format_chars_,
2008 tree format_string_cst_,
2009 const char * const orig_format_chars_,
2010 location_t format_string_loc_,
2011 flag_chars_t &flag_chars_,
2012 int &has_operand_number_,
2013 tree first_fillin_param_,
2014 object_allocator <format_wanted_type> &fwt_pool_,
2015 vec<location_t> *arglocs_)
2017 fki (&format_types[info->format_type]),
2018 flag_specs (fki->flag_specs),
2019 start_of_this_format (format_chars_),
2020 format_chars (format_chars_),
2021 format_string_cst (format_string_cst_),
2022 orig_format_chars (orig_format_chars_),
2023 format_string_loc (format_string_loc_),
2024 fwt_pool (fwt_pool_),
2025 flag_chars (flag_chars_),
2027 main_arg_params (NULL),
2028 has_operand_number (has_operand_number_),
2029 first_fillin_param (first_fillin_param_),
2030 first_wanted_type (NULL),
2031 last_wanted_type (NULL),
2036 /* Handle dollars at the start of format arguments, setting up main_arg_params
2039 Return true if format parsing is to continue, false otherwise. */
2042 argument_parser::read_any_dollar ()
2044 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
2046 /* Possibly read a $ operand number at the start of the format.
2047 If one was previously used, one is required here. If one
2048 is not used here, we can't immediately conclude this is a
2049 format without them, since it could be printf %m or scanf %*. */
2051 opnum = maybe_read_dollar_number (&format_chars, 0,
2053 &main_arg_params, fki);
2058 has_operand_number = 1;
2059 main_arg_num = opnum + info->first_arg_num - 1;
2062 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
2064 if (avoid_dollar_number (format_chars))
2070 /* Read any format flags, but do not yet validate them beyond removing
2071 duplicates, since in general validation depends on the rest of
2074 Return true if format parsing is to continue, false otherwise. */
2077 argument_parser::read_format_flags ()
2079 while (*format_chars != 0
2080 && strchr (fki->flag_chars, *format_chars) != 0)
2082 const format_flag_spec *s = get_flag_spec (flag_specs,
2083 *format_chars, NULL);
2084 if (flag_chars.has_char_p (*format_chars))
2086 format_warning_at_char (format_string_loc, format_string_cst,
2087 format_chars + 1 - orig_format_chars,
2089 "repeated %s in format", _(s->name));
2092 flag_chars.add_char (*format_chars);
2094 if (s->skip_next_char)
2097 if (*format_chars == 0)
2099 warning_at (format_string_loc, OPT_Wformat_,
2100 "missing fill character at end of strfmon format");
2110 /* Read any format width, possibly * or *m$.
2112 Return true if format parsing is to continue, false otherwise. */
2116 read_any_format_width (tree ¶ms,
2117 unsigned HOST_WIDE_INT &arg_num)
2119 if (!fki->width_char)
2122 if (fki->width_type != NULL && *format_chars == '*')
2124 flag_chars.add_char (fki->width_char);
2125 /* "...a field width...may be indicated by an asterisk.
2126 In this case, an int argument supplies the field width..." */
2128 if (has_operand_number != 0)
2131 opnum = maybe_read_dollar_number (&format_chars,
2132 has_operand_number == 1,
2139 has_operand_number = 1;
2140 arg_num = opnum + info->first_arg_num - 1;
2143 has_operand_number = 0;
2147 if (avoid_dollar_number (format_chars))
2150 if (info->first_arg_num != 0)
2157 cur_param = TREE_VALUE (params);
2158 if (has_operand_number <= 0)
2160 params = TREE_CHAIN (params);
2164 width_wanted_type.wanted_type = *fki->width_type;
2165 width_wanted_type.wanted_type_name = NULL;
2166 width_wanted_type.pointer_count = 0;
2167 width_wanted_type.char_lenient_flag = 0;
2168 width_wanted_type.scalar_identity_flag = 0;
2169 width_wanted_type.writing_in_flag = 0;
2170 width_wanted_type.reading_from_flag = 0;
2171 width_wanted_type.kind = CF_KIND_FIELD_WIDTH;
2172 width_wanted_type.format_start = format_chars - 1;
2173 width_wanted_type.format_length = 1;
2174 width_wanted_type.param = cur_param;
2175 width_wanted_type.arg_num = arg_num;
2176 width_wanted_type.offset_loc =
2177 format_chars - orig_format_chars;
2178 width_wanted_type.next = NULL;
2179 if (last_wanted_type != 0)
2180 last_wanted_type->next = &width_wanted_type;
2181 if (first_wanted_type == 0)
2182 first_wanted_type = &width_wanted_type;
2183 last_wanted_type = &width_wanted_type;
2188 /* Possibly read a numeric width. If the width is zero,
2189 we complain if appropriate. */
2190 int non_zero_width_char = FALSE;
2191 int found_width = FALSE;
2192 while (ISDIGIT (*format_chars))
2195 if (*format_chars != '0')
2196 non_zero_width_char = TRUE;
2199 if (found_width && !non_zero_width_char &&
2200 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
2201 warning_at (format_string_loc, OPT_Wformat_,
2202 "zero width in %s format", fki->name);
2204 flag_chars.add_char (fki->width_char);
2210 /* Read any format left precision (must be a number, not *). */
2212 argument_parser::read_any_format_left_precision ()
2214 if (fki->left_precision_char == 0)
2216 if (*format_chars != '#')
2220 flag_chars.add_char (fki->left_precision_char);
2221 if (!ISDIGIT (*format_chars))
2222 format_warning_at_char (format_string_loc, format_string_cst,
2223 format_chars - orig_format_chars,
2225 "empty left precision in %s format", fki->name);
2226 while (ISDIGIT (*format_chars))
2230 /* Read any format precision, possibly * or *m$.
2232 Return true if format parsing is to continue, false otherwise. */
2236 read_any_format_precision (tree ¶ms,
2237 unsigned HOST_WIDE_INT &arg_num)
2239 if (fki->precision_char == 0)
2241 if (*format_chars != '.')
2245 flag_chars.add_char (fki->precision_char);
2246 if (fki->precision_type != NULL && *format_chars == '*')
2248 /* "...a...precision...may be indicated by an asterisk.
2249 In this case, an int argument supplies the...precision." */
2251 if (has_operand_number != 0)
2254 opnum = maybe_read_dollar_number (&format_chars,
2255 has_operand_number == 1,
2262 has_operand_number = 1;
2263 arg_num = opnum + info->first_arg_num - 1;
2266 has_operand_number = 0;
2270 if (avoid_dollar_number (format_chars))
2273 if (info->first_arg_num != 0)
2280 cur_param = TREE_VALUE (params);
2281 if (has_operand_number <= 0)
2283 params = TREE_CHAIN (params);
2287 precision_wanted_type.wanted_type = *fki->precision_type;
2288 precision_wanted_type.wanted_type_name = NULL;
2289 precision_wanted_type.pointer_count = 0;
2290 precision_wanted_type.char_lenient_flag = 0;
2291 precision_wanted_type.scalar_identity_flag = 0;
2292 precision_wanted_type.writing_in_flag = 0;
2293 precision_wanted_type.reading_from_flag = 0;
2294 precision_wanted_type.kind = CF_KIND_FIELD_PRECISION;
2295 precision_wanted_type.param = cur_param;
2296 precision_wanted_type.format_start = format_chars - 2;
2297 precision_wanted_type.format_length = 2;
2298 precision_wanted_type.arg_num = arg_num;
2299 precision_wanted_type.offset_loc =
2300 format_chars - orig_format_chars;
2301 precision_wanted_type.next = NULL;
2302 if (last_wanted_type != 0)
2303 last_wanted_type->next = &precision_wanted_type;
2304 if (first_wanted_type == 0)
2305 first_wanted_type = &precision_wanted_type;
2306 last_wanted_type = &precision_wanted_type;
2311 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
2312 && !ISDIGIT (*format_chars))
2313 format_warning_at_char (format_string_loc, format_string_cst,
2314 format_chars - orig_format_chars,
2316 "empty precision in %s format", fki->name);
2317 while (ISDIGIT (*format_chars))
2324 /* Parse any assignment-allocation flags, which request an extra
2325 char ** for writing back a dynamically-allocated char *.
2326 This is for handling the optional 'm' character in scanf,
2327 and, before C99, 'a' (for compatibility with a non-standard
2328 GNU libc extension). */
2331 argument_parser::handle_alloc_chars ()
2333 if (fki->alloc_char && fki->alloc_char == *format_chars)
2335 flag_chars.add_char (fki->alloc_char);
2339 /* Handle the scanf allocation kludge. */
2340 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
2342 if (*format_chars == 'a' && !flag_isoc99)
2344 if (format_chars[1] == 's' || format_chars[1] == 'S'
2345 || format_chars[1] == '[')
2347 /* 'a' is used as a flag. */
2348 flag_chars.add_char ('a');
2355 /* Look for length modifiers within the current format argument,
2356 returning a length_modifier instance describing it (or the
2357 default if one is not found).
2359 Issue warnings about non-standard modifiers. */
2362 argument_parser::read_any_length_modifier ()
2364 length_modifier result;
2366 const format_length_info *fli = fki->length_char_specs;
2370 while (fli->name != 0
2371 && strncmp (fli->name, format_chars, strlen (fli->name)))
2375 format_chars += strlen (fli->name);
2376 if (fli->double_name != 0 && fli->name[0] == *format_chars)
2379 result = length_modifier (fli->double_name, fli->double_index,
2380 fli->double_std, 0);
2384 result = length_modifier (fli->name, fli->index, fli->std,
2385 fli->scalar_identity_flag);
2387 flag_chars.add_char (fki->length_code_char);
2391 /* Warn if the length modifier is non-standard. */
2392 if (ADJ_STD (result.std) > C_STD_VER)
2393 warning_at (format_string_loc, OPT_Wformat_,
2394 "%s does not support the %qs %s length modifier",
2395 C_STD_NAME (result.std), result.chars,
2402 /* Read any other modifier (strftime E/O). */
2405 argument_parser::read_any_other_modifier ()
2407 if (fki->modifier_chars == NULL)
2410 while (*format_chars != 0
2411 && strchr (fki->modifier_chars, *format_chars) != 0)
2413 if (flag_chars.has_char_p (*format_chars))
2415 const format_flag_spec *s = get_flag_spec (flag_specs,
2416 *format_chars, NULL);
2417 format_warning_at_char (format_string_loc, format_string_cst,
2418 format_chars - orig_format_chars,
2420 "repeated %s in format", _(s->name));
2423 flag_chars.add_char (*format_chars);
2428 /* Return the format_char_info corresponding to FORMAT_CHAR,
2429 potentially issuing a warning if the format char is
2430 not supported in the C standard version we are checking
2433 Issue a warning and return NULL if it is not found.
2435 Issue warnings about non-standard modifiers. */
2437 const format_char_info *
2438 argument_parser::find_format_char_info (char format_char)
2440 const format_char_info *fci = fki->conversion_specs;
2442 while (fci->format_chars != 0
2443 && strchr (fci->format_chars, format_char) == 0)
2445 if (fci->format_chars == 0)
2447 format_warning_at_char (format_string_loc, format_string_cst,
2448 format_chars - orig_format_chars,
2450 "unknown conversion type character"
2458 if (ADJ_STD (fci->std) > C_STD_VER)
2459 format_warning_at_char (format_string_loc, format_string_cst,
2460 format_chars - orig_format_chars,
2462 "%s does not support the %<%%%c%> %s format",
2463 C_STD_NAME (fci->std), format_char, fki->name);
2469 /* Validate the pairs of flags used.
2470 Issue warnings about incompatible combinations of flags. */
2473 argument_parser::validate_flag_pairs (const format_char_info *fci,
2476 const format_flag_pair * const bad_flag_pairs = fki->bad_flag_pairs;
2478 for (int i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
2480 const format_flag_spec *s, *t;
2481 if (!flag_chars.has_char_p (bad_flag_pairs[i].flag_char1))
2483 if (!flag_chars.has_char_p (bad_flag_pairs[i].flag_char2))
2485 if (bad_flag_pairs[i].predicate != 0
2486 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
2488 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
2489 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
2490 if (bad_flag_pairs[i].ignored)
2492 if (bad_flag_pairs[i].predicate != 0)
2493 warning_at (format_string_loc, OPT_Wformat_,
2494 "%s ignored with %s and %<%%%c%> %s format",
2495 _(s->name), _(t->name), format_char,
2498 warning_at (format_string_loc, OPT_Wformat_,
2499 "%s ignored with %s in %s format",
2500 _(s->name), _(t->name), fki->name);
2504 if (bad_flag_pairs[i].predicate != 0)
2505 warning_at (format_string_loc, OPT_Wformat_,
2506 "use of %s and %s together with %<%%%c%> %s format",
2507 _(s->name), _(t->name), format_char,
2510 warning_at (format_string_loc, OPT_Wformat_,
2511 "use of %s and %s together in %s format",
2512 _(s->name), _(t->name), fki->name);
2517 /* Give Y2K warnings. */
2520 argument_parser::give_y2k_warnings (const format_char_info *fci,
2523 if (!warn_format_y2k)
2527 if (strchr (fci->flags2, '4') != 0)
2528 if (flag_chars.has_char_p ('E'))
2532 else if (strchr (fci->flags2, '3') != 0)
2534 else if (strchr (fci->flags2, '2') != 0)
2537 warning_at (format_string_loc, OPT_Wformat_y2k,
2538 "%<%%%c%> yields only last 2 digits of "
2539 "year in some locales", format_char);
2540 else if (y2k_level == 2)
2541 warning_at (format_string_loc, OPT_Wformat_y2k,
2542 "%<%%%c%> yields only last 2 digits of year",
2546 /* Parse any "scan sets" enclosed in square brackets, e.g.
2547 for scanf-style calls. */
2550 argument_parser::parse_any_scan_set (const format_char_info *fci)
2552 if (strchr (fci->flags2, '[') == NULL)
2555 /* Skip over scan set, in case it happens to have '%' in it. */
2556 if (*format_chars == '^')
2558 /* Find closing bracket; if one is hit immediately, then
2559 it's part of the scan set rather than a terminator. */
2560 if (*format_chars == ']')
2562 while (*format_chars && *format_chars != ']')
2564 if (*format_chars != ']')
2565 /* The end of the format string was reached. */
2566 format_warning_at_char (format_string_loc, format_string_cst,
2567 format_chars - orig_format_chars,
2569 "no closing %<]%> for %<%%[%> format");
2572 /* Return true if this argument is to be continued to be parsed,
2573 false to skip to next argument. */
2576 argument_parser::handle_conversions (const format_char_info *fci,
2577 const length_modifier &len_modifier,
2579 const char *&wanted_type_name,
2580 unsigned HOST_WIDE_INT &arg_num,
2584 enum format_std_version wanted_type_std;
2586 if (!(fki->flags & (int) FMT_FLAG_ARG_CONVERT))
2589 wanted_type = (fci->types[len_modifier.val].type
2590 ? *fci->types[len_modifier.val].type : 0);
2591 wanted_type_name = fci->types[len_modifier.val].name;
2592 wanted_type_std = fci->types[len_modifier.val].std;
2593 if (wanted_type == 0)
2595 format_warning_at_char (format_string_loc, format_string_cst,
2596 format_chars - orig_format_chars,
2598 "use of %qs length modifier with %qc type"
2599 " character has either no effect"
2600 " or undefined behavior",
2601 len_modifier.chars, format_char);
2602 /* Heuristic: skip one argument when an invalid length/type
2603 combination is encountered. */
2606 params = TREE_CHAIN (params);
2610 /* Warn if non-standard, provided it is more non-standard
2611 than the length and type characters that may already
2612 have been warned for. */
2613 && ADJ_STD (wanted_type_std) > ADJ_STD (len_modifier.std)
2614 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2616 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2617 format_warning_at_char (format_string_loc, format_string_cst,
2618 format_chars - orig_format_chars,
2620 "%s does not support the %<%%%s%c%> %s format",
2621 C_STD_NAME (wanted_type_std),
2623 format_char, fki->name);
2629 /* Check type of argument against desired type.
2631 Return true if format parsing is to continue, false otherwise. */
2635 check_argument_type (const format_char_info *fci,
2636 const length_modifier &len_modifier,
2638 const char *&wanted_type_name,
2639 const bool suppressed,
2640 unsigned HOST_WIDE_INT &arg_num,
2642 const int alloc_flag,
2643 const char * const format_start,
2644 const char * const type_start,
2645 location_t fmt_param_loc,
2646 char conversion_char)
2648 if (info->first_arg_num == 0)
2651 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2654 if (main_arg_num != 0)
2657 warning_at (format_string_loc, OPT_Wformat_,
2658 "operand number specified with "
2659 "suppressed assignment");
2661 warning_at (format_string_loc, OPT_Wformat_,
2662 "operand number specified for format "
2663 "taking no argument");
2668 format_wanted_type *wanted_type_ptr;
2670 if (main_arg_num != 0)
2672 arg_num = main_arg_num;
2673 params = main_arg_params;
2678 if (has_operand_number > 0)
2680 warning_at (format_string_loc, OPT_Wformat_,
2681 "missing $ operand number in format");
2685 has_operand_number = 0;
2688 wanted_type_ptr = &main_wanted_type;
2696 cur_param = TREE_VALUE (params);
2697 params = TREE_CHAIN (params);
2700 wanted_type_ptr->wanted_type = wanted_type;
2701 wanted_type_ptr->wanted_type_name = wanted_type_name;
2702 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2703 wanted_type_ptr->char_lenient_flag = 0;
2704 if (strchr (fci->flags2, 'c') != 0)
2705 wanted_type_ptr->char_lenient_flag = 1;
2706 wanted_type_ptr->scalar_identity_flag = 0;
2707 if (len_modifier.scalar_identity_flag)
2708 wanted_type_ptr->scalar_identity_flag = 1;
2709 wanted_type_ptr->writing_in_flag = 0;
2710 wanted_type_ptr->reading_from_flag = 0;
2712 wanted_type_ptr->writing_in_flag = 1;
2715 if (strchr (fci->flags2, 'W') != 0)
2716 wanted_type_ptr->writing_in_flag = 1;
2717 if (strchr (fci->flags2, 'R') != 0)
2718 wanted_type_ptr->reading_from_flag = 1;
2720 wanted_type_ptr->kind = CF_KIND_FORMAT;
2721 wanted_type_ptr->param = cur_param;
2722 wanted_type_ptr->arg_num = arg_num;
2723 wanted_type_ptr->format_start = format_start;
2724 wanted_type_ptr->format_length = format_chars - format_start;
2725 wanted_type_ptr->offset_loc = format_chars - orig_format_chars;
2726 wanted_type_ptr->next = NULL;
2727 if (last_wanted_type != 0)
2728 last_wanted_type->next = wanted_type_ptr;
2729 if (first_wanted_type == 0)
2730 first_wanted_type = wanted_type_ptr;
2731 last_wanted_type = wanted_type_ptr;
2736 wanted_type_ptr = fwt_pool.allocate ();
2738 wanted_type = *fci->types[len_modifier.val].type;
2739 wanted_type_name = fci->types[len_modifier.val].name;
2744 if (first_wanted_type != 0)
2746 ptrdiff_t offset_to_format_start = (start_of_this_format - 1) - orig_format_chars;
2747 ptrdiff_t offset_to_format_end = (format_chars - 1) - orig_format_chars;
2748 /* By default, use the end of the range for the caret location. */
2749 substring_loc fmt_loc (fmt_param_loc, TREE_TYPE (format_string_cst),
2750 offset_to_format_end,
2751 offset_to_format_start, offset_to_format_end);
2752 ptrdiff_t offset_to_type_start = type_start - orig_format_chars;
2753 check_format_types (fmt_loc, first_wanted_type, fki,
2754 offset_to_type_start,
2755 conversion_char, arglocs);
2761 /* Do the main part of checking a call to a format function. FORMAT_CHARS
2762 is the NUL-terminated format string (which at this point may contain
2763 internal NUL characters); FORMAT_LENGTH is its length (excluding the
2764 terminating NUL character). ARG_NUM is one less than the number of
2765 the first format argument to check; PARAMS points to that format
2766 argument in the list of arguments. */
2769 check_format_info_main (format_check_results *res,
2770 function_format_info *info, const char *format_chars,
2771 location_t fmt_param_loc, tree format_string_cst,
2772 int format_length, tree params,
2773 unsigned HOST_WIDE_INT arg_num,
2774 object_allocator <format_wanted_type> &fwt_pool,
2775 vec<location_t> *arglocs)
2777 const char * const orig_format_chars = format_chars;
2778 const tree first_fillin_param = params;
2780 const format_kind_info * const fki = &format_types[info->format_type];
2781 const format_flag_spec * const flag_specs = fki->flag_specs;
2782 const location_t format_string_loc = res->format_string_loc;
2784 /* -1 if no conversions taking an operand have been found; 0 if one has
2785 and it didn't use $; 1 if $ formats are in use. */
2786 int has_operand_number = -1;
2788 /* Vector of pointers to opening quoting directives (like GCC "%<"). */
2789 auto_vec<const char*> quotdirs;
2791 /* Pointers to the most recent color directives (like GCC's "%r or %R").
2792 A starting color directive much be terminated before the end of
2793 the format string. A terminating directive makes no sense without
2794 a prior starting directive. */
2795 const char *color_begin = NULL;
2796 const char *color_end = NULL;
2798 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
2800 while (*format_chars != 0)
2802 if (*format_chars++ != '%')
2804 if (*format_chars == 0)
2806 format_warning_at_char (format_string_loc, format_string_cst,
2807 format_chars - orig_format_chars,
2809 "spurious trailing %<%%%> in format");
2812 if (*format_chars == '%')
2818 flag_chars_t flag_chars;
2819 argument_parser arg_parser (info, format_chars, format_string_cst,
2820 orig_format_chars, format_string_loc,
2821 flag_chars, has_operand_number,
2822 first_fillin_param, fwt_pool, arglocs);
2824 if (!arg_parser.read_any_dollar ())
2827 if (!arg_parser.read_format_flags ())
2830 /* Read any format width, possibly * or *m$. */
2831 if (!arg_parser.read_any_format_width (params, arg_num))
2834 /* Read any format left precision (must be a number, not *). */
2835 arg_parser.read_any_format_left_precision ();
2837 /* Read any format precision, possibly * or *m$. */
2838 if (!arg_parser.read_any_format_precision (params, arg_num))
2841 const char *format_start = format_chars;
2843 arg_parser.handle_alloc_chars ();
2845 /* The rest of the conversion specification is the length modifier
2846 (if any), and the conversion specifier, so this is where the
2847 type information starts. If we need to issue a suggestion
2848 about a type mismatch, then we should preserve everything up
2850 const char *type_start = format_chars;
2852 /* Read any length modifier, if this kind of format has them. */
2853 const length_modifier len_modifier
2854 = arg_parser.read_any_length_modifier ();
2856 /* Read any modifier (strftime E/O). */
2857 arg_parser.read_any_other_modifier ();
2859 char format_char = *format_chars;
2860 if (format_char == 0
2861 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
2862 && format_char == '%'))
2864 format_warning_at_char (format_string_loc, format_string_cst,
2865 format_chars - orig_format_chars,
2867 "conversion lacks type at end of format");
2872 const format_char_info * const fci
2873 = arg_parser.find_format_char_info (format_char);
2877 flag_chars.validate (fki, fci, flag_specs, format_chars,
2879 format_string_loc, orig_format_chars, format_char,
2880 quotdirs.length () > 0);
2882 const int alloc_flag = flag_chars.get_alloc_flag (fki);
2883 const bool suppressed = flag_chars.assignment_suppression_p (fki);
2885 /* Diagnose nested or unmatched quoting directives such as GCC's
2886 "%<...%<" and "%>...%>". */
2887 bool quot_begin_p = strchr (fci->flags2, '<');
2888 bool quot_end_p = strchr (fci->flags2, '>');
2890 if (quot_begin_p && !quot_end_p)
2892 if (quotdirs.length ())
2893 format_warning_at_char (format_string_loc, format_string_cst,
2894 format_chars - orig_format_chars,
2896 "nested quoting directive");
2897 quotdirs.safe_push (format_chars);
2899 else if (!quot_begin_p && quot_end_p)
2901 if (quotdirs.length ())
2904 format_warning_at_char (format_string_loc, format_string_cst,
2905 format_chars - orig_format_chars,
2907 "unmatched quoting directive");
2910 bool color_begin_p = strchr (fci->flags2, '/');
2913 color_begin = format_chars;
2916 else if (strchr (fci->flags2, '\\'))
2919 format_warning_at_char (format_string_loc, format_string_cst,
2920 format_chars - orig_format_chars,
2922 "%qc directive redundant after prior "
2923 "occurence of the same", format_char);
2924 else if (!color_begin)
2925 format_warning_at_char (format_string_loc, format_string_cst,
2926 format_chars - orig_format_chars,
2928 "unmatched color reset directive");
2929 color_end = format_chars;
2932 /* Diagnose directives that shouldn't appear in a quoted sequence.
2933 (They are denoted by a double quote in FLAGS2.) */
2934 if (quotdirs.length ())
2936 if (strchr (fci->flags2, '"'))
2937 format_warning_at_char (format_string_loc, format_string_cst,
2938 format_chars - orig_format_chars,
2940 "%qc conversion used within a quoted "
2945 /* Validate the pairs of flags used. */
2946 arg_parser.validate_flag_pairs (fci, format_char);
2948 arg_parser.give_y2k_warnings (fci, format_char);
2950 arg_parser.parse_any_scan_set (fci);
2952 tree wanted_type = NULL;
2953 const char *wanted_type_name = NULL;
2955 if (!arg_parser.handle_conversions (fci, len_modifier,
2956 wanted_type, wanted_type_name,
2962 arg_parser.main_wanted_type.next = NULL;
2964 /* Finally. . .check type of argument against desired type! */
2965 if (!arg_parser.check_argument_type (fci, len_modifier,
2966 wanted_type, wanted_type_name,
2970 format_start, type_start,
2976 if (format_chars - orig_format_chars != format_length)
2977 format_warning_at_char (format_string_loc, format_string_cst,
2978 format_chars + 1 - orig_format_chars,
2979 OPT_Wformat_contains_nul,
2980 "embedded %<\\0%> in format");
2981 if (info->first_arg_num != 0 && params != 0
2982 && has_operand_number <= 0)
2984 res->number_other--;
2985 res->number_extra_args++;
2987 if (has_operand_number > 0)
2988 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
2990 if (quotdirs.length ())
2991 format_warning_at_char (format_string_loc, format_string_cst,
2992 quotdirs.pop () - orig_format_chars,
2993 OPT_Wformat_, "unterminated quoting directive");
2994 if (color_begin && !color_end)
2995 format_warning_at_char (format_string_loc, format_string_cst,
2996 color_begin - orig_format_chars,
2997 OPT_Wformat_, "unterminated color directive");
3000 /* Check the argument types from a single format conversion (possibly
3001 including width and precision arguments).
3003 FMT_LOC is the location of the format conversion.
3005 TYPES is a singly-linked list expressing the parts of the format
3006 conversion that expect argument types, and the arguments they
3009 OFFSET_TO_TYPE_START is the offset within the execution-charset encoded
3010 format string to where type information begins for the conversion
3011 (the length modifier and conversion specifier).
3013 CONVERSION_CHAR is the user-provided conversion specifier.
3017 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3019 then FMT_LOC covers this range:
3021 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3024 and TYPES in this case is a three-entry singly-linked list consisting of:
3025 (1) the check for the field width here:
3026 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3029 (2) the check for the field precision here:
3030 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3033 (3) the check for the length modifier and conversion char here:
3034 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3038 OFFSET_TO_TYPE_START is 13, the offset to the "lld" within the
3041 0000000000111111111122
3042 0123456789012345678901
3043 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3045 | ` CONVERSION_CHAR: 'd'
3046 type starts here. */
3049 check_format_types (const substring_loc &fmt_loc,
3050 format_wanted_type *types, const format_kind_info *fki,
3051 int offset_to_type_start,
3052 char conversion_char,
3053 vec<location_t> *arglocs)
3055 for (; types != 0; types = types->next)
3065 wanted_type = types->wanted_type;
3066 arg_num = types->arg_num;
3068 /* The following should not occur here. */
3069 gcc_assert (wanted_type);
3070 gcc_assert (wanted_type != void_type_node || types->pointer_count);
3072 if (types->pointer_count == 0)
3073 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
3075 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
3077 cur_param = types->param;
3080 format_type_warning (fmt_loc, UNKNOWN_LOCATION, types, wanted_type,
3081 NULL, fki, offset_to_type_start,
3086 cur_type = TREE_TYPE (cur_param);
3087 if (cur_type == error_mark_node)
3089 orig_cur_type = cur_type;
3092 location_t param_loc = UNKNOWN_LOCATION;
3093 if (EXPR_HAS_LOCATION (cur_param))
3094 param_loc = EXPR_LOCATION (cur_param);
3097 /* arg_num is 1-based. */
3098 gcc_assert (types->arg_num > 0);
3099 param_loc = (*arglocs)[types->arg_num - 1];
3102 STRIP_NOPS (cur_param);
3104 /* Check the types of any additional pointer arguments
3105 that precede the "real" argument. */
3106 for (i = 0; i < types->pointer_count; ++i)
3108 if (TREE_CODE (cur_type) == POINTER_TYPE)
3110 cur_type = TREE_TYPE (cur_type);
3111 if (cur_type == error_mark_node)
3114 /* Check for writing through a NULL pointer. */
3115 if (types->writing_in_flag
3118 && integer_zerop (cur_param))
3119 warning (OPT_Wformat_, "writing through null pointer "
3120 "(argument %d)", arg_num);
3122 /* Check for reading through a NULL pointer. */
3123 if (types->reading_from_flag
3126 && integer_zerop (cur_param))
3127 warning (OPT_Wformat_, "reading through null pointer "
3128 "(argument %d)", arg_num);
3130 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
3131 cur_param = TREE_OPERAND (cur_param, 0);
3135 /* See if this is an attempt to write into a const type with
3136 scanf or with printf "%n". Note: the writing in happens
3137 at the first indirection only, if for example
3138 void * const * is passed to scanf %p; passing
3139 const void ** is simply passing an incompatible type. */
3140 if (types->writing_in_flag
3142 && (TYPE_READONLY (cur_type)
3144 && (CONSTANT_CLASS_P (cur_param)
3145 || (DECL_P (cur_param)
3146 && TREE_READONLY (cur_param))))))
3147 warning (OPT_Wformat_, "writing into constant object "
3148 "(argument %d)", arg_num);
3150 /* If there are extra type qualifiers beyond the first
3151 indirection, then this makes the types technically
3155 && (TYPE_READONLY (cur_type)
3156 || TYPE_VOLATILE (cur_type)
3157 || TYPE_ATOMIC (cur_type)
3158 || TYPE_RESTRICT (cur_type)))
3159 warning (OPT_Wformat_, "extra type qualifiers in format "
3160 "argument (argument %d)",
3166 format_type_warning (fmt_loc, param_loc,
3167 types, wanted_type, orig_cur_type, fki,
3168 offset_to_type_start, conversion_char);
3173 if (i < types->pointer_count)
3176 cur_type = TYPE_MAIN_VARIANT (cur_type);
3178 /* Check whether the argument type is a character type. This leniency
3179 only applies to certain formats, flagged with 'c'. */
3180 if (types->char_lenient_flag)
3181 char_type_flag = (cur_type == char_type_node
3182 || cur_type == signed_char_type_node
3183 || cur_type == unsigned_char_type_node);
3185 /* Check the type of the "real" argument, if there's a type we want. */
3186 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
3188 /* If we want 'void *', allow any pointer type.
3189 (Anything else would already have got a warning.)
3190 With -Wpedantic, only allow pointers to void and to character
3192 if (wanted_type == void_type_node
3193 && (!pedantic || (i == 1 && char_type_flag)))
3195 /* Don't warn about differences merely in signedness, unless
3196 -Wpedantic. With -Wpedantic, warn if the type is a pointer
3197 target and not a character type, and for character types at
3198 a second level of indirection. */
3199 if (TREE_CODE (wanted_type) == INTEGER_TYPE
3200 && TREE_CODE (cur_type) == INTEGER_TYPE
3201 && ((!pedantic && !warn_format_signedness)
3202 || (i == 0 && !warn_format_signedness)
3203 || (i == 1 && char_type_flag))
3204 && (TYPE_UNSIGNED (wanted_type)
3205 ? wanted_type == c_common_unsigned_type (cur_type)
3206 : wanted_type == c_common_signed_type (cur_type)))
3208 /* Don't warn about differences merely in signedness if we know
3209 that the current type is integer-promoted and its original type
3210 was unsigned such as that it is in the range of WANTED_TYPE. */
3211 if (TREE_CODE (wanted_type) == INTEGER_TYPE
3212 && TREE_CODE (cur_type) == INTEGER_TYPE
3213 && warn_format_signedness
3214 && TYPE_UNSIGNED (wanted_type)
3215 && cur_param != NULL_TREE
3216 && TREE_CODE (cur_param) == NOP_EXPR)
3218 tree t = TREE_TYPE (TREE_OPERAND (cur_param, 0));
3219 if (TYPE_UNSIGNED (t)
3220 && cur_type == lang_hooks.types.type_promotes_to (t))
3223 /* Likewise, "signed char", "unsigned char" and "char" are
3224 equivalent but the above test won't consider them equivalent. */
3225 if (wanted_type == char_type_node
3226 && (!pedantic || i < 2)
3229 if (types->scalar_identity_flag
3230 && (TREE_CODE (cur_type) == TREE_CODE (wanted_type)
3231 || (INTEGRAL_TYPE_P (cur_type)
3232 && INTEGRAL_TYPE_P (wanted_type)))
3233 && TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type))
3235 /* Now we have a type mismatch. */
3236 format_type_warning (fmt_loc, param_loc, types,
3237 wanted_type, orig_cur_type, fki,
3238 offset_to_type_start, conversion_char);
3242 /* Given type TYPE, attempt to dereference the type N times
3243 (e.g. from ("int ***", 2) to "int *")
3245 Return the derefenced type, with any qualifiers
3246 such as "const" stripped from the result, or
3247 NULL if unsuccessful (e.g. TYPE is not a pointer type). */
3250 deref_n_times (tree type, int n)
3254 for (int i = n; i > 0; i--)
3256 if (TREE_CODE (type) != POINTER_TYPE)
3258 type = TREE_TYPE (type);
3260 /* Strip off any "const" etc. */
3261 return build_qualified_type (type, 0);
3264 /* Lookup the format code for FORMAT_LEN within FLI,
3265 returning the string code for expressing it, or NULL
3266 if it is not found. */
3269 get_modifier_for_format_len (const format_length_info *fli,
3270 enum format_lengths format_len)
3272 for (; fli->name; fli++)
3274 if (fli->index == format_len)
3276 if (fli->double_index == format_len)
3277 return fli->double_name;
3284 namespace selftest {
3287 test_get_modifier_for_format_len ()
3290 get_modifier_for_format_len (printf_length_specs, FMT_LEN_h));
3292 get_modifier_for_format_len (printf_length_specs, FMT_LEN_hh));
3294 get_modifier_for_format_len (printf_length_specs, FMT_LEN_L));
3296 get_modifier_for_format_len (printf_length_specs, FMT_LEN_none));
3299 } // namespace selftest
3301 #endif /* CHECKING_P */
3303 /* Determine if SPEC_TYPE and ARG_TYPE are sufficiently similar for a
3304 format_type_detail using SPEC_TYPE to be offered as a suggestion for
3305 Wformat type errors where the argument has type ARG_TYPE. */
3308 matching_type_p (tree spec_type, tree arg_type)
3310 gcc_assert (spec_type);
3311 gcc_assert (arg_type);
3313 /* If any of the types requires structural equality, we can't compare
3314 their canonical types. */
3315 if (TYPE_STRUCTURAL_EQUALITY_P (spec_type)
3316 || TYPE_STRUCTURAL_EQUALITY_P (arg_type))
3319 spec_type = TYPE_CANONICAL (spec_type);
3320 arg_type = TYPE_CANONICAL (arg_type);
3322 if (TREE_CODE (spec_type) == INTEGER_TYPE
3323 && TREE_CODE (arg_type) == INTEGER_TYPE
3324 && (TYPE_UNSIGNED (spec_type)
3325 ? spec_type == c_common_unsigned_type (arg_type)
3326 : spec_type == c_common_signed_type (arg_type)))
3329 return spec_type == arg_type;
3332 /* Subroutine of get_format_for_type.
3334 Generate a string containing the length modifier and conversion specifier
3335 that should be used to format arguments of type ARG_TYPE within FKI
3336 (effectively the inverse of the checking code).
3338 If CONVERSION_CHAR is not zero (the first pass), the resulting suggestion
3339 is required to use it, for correcting bogus length modifiers.
3340 If CONVERSION_CHAR is zero (the second pass), then allow any suggestion
3341 that matches ARG_TYPE.
3343 If successful, returns a non-NULL string which should be freed
3345 Otherwise, returns NULL. */
3348 get_format_for_type_1 (const format_kind_info *fki, tree arg_type,
3349 char conversion_char)
3351 gcc_assert (arg_type);
3353 const format_char_info *spec;
3354 for (spec = &fki->conversion_specs[0];
3358 if (conversion_char)
3359 if (!strchr (spec->format_chars, conversion_char))
3362 tree effective_arg_type = deref_n_times (arg_type,
3363 spec->pointer_count);
3364 if (!effective_arg_type)
3366 for (int i = 0; i < FMT_LEN_MAX; i++)
3368 const format_type_detail *ftd = &spec->types[i];
3371 if (matching_type_p (*ftd->type, effective_arg_type))
3373 const char *len_modifier
3374 = get_modifier_for_format_len (fki->length_char_specs,
3375 (enum format_lengths)i);
3379 if (conversion_char)
3380 /* We found a match, using the given conversion char - the
3381 length modifier was incorrect (or absent).
3382 Provide a suggestion using the conversion char with the
3383 correct length modifier for the type. */
3384 return xasprintf ("%s%c", len_modifier, conversion_char);
3386 /* 2nd pass: no match was possible using the user-provided
3387 conversion char, but we do have a match without using it.
3388 Provide a suggestion using the first conversion char
3389 listed for the given type. */
3390 return xasprintf ("%s%c", len_modifier, spec->format_chars[0]);
3398 /* Generate a string containing the length modifier and conversion specifier
3399 that should be used to format arguments of type ARG_TYPE within FKI
3400 (effectively the inverse of the checking code).
3402 If successful, returns a non-NULL string which should be freed
3404 Otherwise, returns NULL. */
3407 get_format_for_type (const format_kind_info *fki, tree arg_type,
3408 char conversion_char)
3410 gcc_assert (arg_type);
3411 gcc_assert (conversion_char);
3413 /* First pass: look for a format_char_info containing CONVERSION_CHAR
3414 If we find one, then presumably the length modifier was incorrect
3416 char *result = get_format_for_type_1 (fki, arg_type, conversion_char);
3420 /* Second pass: we didn't find a match for CONVERSION_CHAR, so try
3421 matching just on the type. */
3422 return get_format_for_type_1 (fki, arg_type, '\0');
3425 /* Attempt to get a string for use as a replacement fix-it hint for the
3426 source range in FMT_LOC.
3428 Preserve all of the text within the range of FMT_LOC up to
3429 OFFSET_TO_TYPE_START, replacing the rest with an appropriate
3430 length modifier and conversion specifier for ARG_TYPE, attempting
3431 to keep the user-provided CONVERSION_CHAR if possible.
3433 For example, given a long vs long long mismatch for arg5 here:
3435 000000000111111111122222222223333333333|
3436 123456789012345678901234567890123456789` column numbers
3437 0000000000111111111122|
3438 0123456789012345678901` string offsets
3439 V~~~~~~~~ : range of FMT_LOC, from cols 23-31
3440 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3442 | ` CONVERSION_CHAR: 'd'
3445 where OFFSET_TO_TYPE_START is 13 (the offset to the "lld" within the
3446 STRING_CST), where the user provided:
3448 the result (assuming "long" argument 5) should be:
3451 If successful, returns a non-NULL string which should be freed
3453 Otherwise, returns NULL. */
3456 get_corrected_substring (const substring_loc &fmt_loc,
3457 format_wanted_type *type, tree arg_type,
3458 const format_kind_info *fki,
3459 int offset_to_type_start, char conversion_char)
3461 /* Attempt to provide hints for argument types, but not for field widths
3465 if (type->kind != CF_KIND_FORMAT)
3468 /* Locate the current code within the source range, rejecting
3469 any awkward cases where the format string occupies more than
3471 Lookup the place where the type starts (including any length
3472 modifiers), getting it as the caret location. */
3473 substring_loc type_loc (fmt_loc);
3474 type_loc.set_caret_index (offset_to_type_start);
3476 location_t fmt_substring_loc;
3477 const char *err = type_loc.get_location (&fmt_substring_loc);
3481 source_range fmt_substring_range
3482 = get_range_from_loc (line_table, fmt_substring_loc);
3484 expanded_location caret
3485 = expand_location_to_spelling_point (fmt_substring_loc);
3486 expanded_location start
3487 = expand_location_to_spelling_point (fmt_substring_range.m_start);
3488 expanded_location finish
3489 = expand_location_to_spelling_point (fmt_substring_range.m_finish);
3490 if (caret.file != start.file)
3492 if (start.file != finish.file)
3494 if (caret.line != start.line)
3496 if (start.line != finish.line)
3498 if (start.column > caret.column)
3500 if (start.column > finish.column)
3502 if (caret.column > finish.column)
3506 const char *line = location_get_source_line (start.file, start.line,
3511 /* If we got this far, then we have the line containing the
3512 existing conversion specification.
3514 Generate a trimmed copy, containing the prefix part of the conversion
3515 specification, up to the (but not including) the length modifier.
3516 In the above example, this would be "%-+*.*". */
3517 const char *current_content = line + start.column - 1;
3518 int length_up_to_type = caret.column - start.column;
3519 char *prefix = xstrndup (current_content, length_up_to_type);
3521 /* Now attempt to generate a suggestion for the rest of the specification
3522 (length modifier and conversion char), based on ARG_TYPE and
3524 In the above example, this would be "ld". */
3525 char *format_for_type = get_format_for_type (fki, arg_type, conversion_char);
3526 if (!format_for_type)
3532 /* Success. Generate the resulting suggestion for the whole range of
3533 FMT_LOC by concatenating the two strings.
3534 In the above example, this would be "%-+*.*ld". */
3535 char *result = concat (prefix, format_for_type, NULL);
3536 free (format_for_type);
3541 /* Give a warning about a format argument of different type from that expected.
3542 The range of the diagnostic is taken from WHOLE_FMT_LOC; the caret location
3543 is based on the location of the char at TYPE->offset_loc.
3544 PARAM_LOC is the location of the relevant argument, or UNKNOWN_LOCATION
3545 if this is unavailable.
3546 WANTED_TYPE is the type the argument should have,
3547 possibly stripped of pointer dereferences. The description (such as "field
3548 precision"), the placement in the format string, a possibly more
3549 friendly name of WANTED_TYPE, and the number of pointer dereferences
3550 are taken from TYPE. ARG_TYPE is the type of the actual argument,
3551 or NULL if it is missing.
3553 OFFSET_TO_TYPE_START is the offset within the execution-charset encoded
3554 format string to where type information begins for the conversion
3555 (the length modifier and conversion specifier).
3556 CONVERSION_CHAR is the user-provided conversion specifier.
3558 For example, given a type mismatch for argument 5 here:
3560 00000000011111111112222222222333333333344444444445555555555|
3561 12345678901234567890123456789012345678901234567890123456789` column numbers
3562 0000000000111111111122|
3563 0123456789012345678901` offsets within STRING_CST
3564 V~~~~~~~~ : range of WHOLE_FMT_LOC, from cols 23-31
3565 sprintf (d, "before %-+*.*lld after", int_expr, int_expr, long_expr);
3567 | ` CONVERSION_CHAR: 'd' PARAM_LOC
3570 OFFSET_TO_TYPE_START is 13, the offset to the "lld" within the
3574 format_type_warning (const substring_loc &whole_fmt_loc,
3575 location_t param_loc,
3576 format_wanted_type *type,
3577 tree wanted_type, tree arg_type,
3578 const format_kind_info *fki,
3579 int offset_to_type_start,
3580 char conversion_char)
3582 enum format_specifier_kind kind = type->kind;
3583 const char *wanted_type_name = type->wanted_type_name;
3584 const char *format_start = type->format_start;
3585 int format_length = type->format_length;
3586 int pointer_count = type->pointer_count;
3587 int arg_num = type->arg_num;
3590 /* If ARG_TYPE is a typedef with a misleading name (for example,
3591 size_t but not the standard size_t expected by printf %zu), avoid
3592 printing the typedef name. */
3593 if (wanted_type_name
3595 && TYPE_NAME (arg_type)
3596 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
3597 && DECL_NAME (TYPE_NAME (arg_type))
3598 && !strcmp (wanted_type_name,
3599 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
3600 arg_type = TYPE_MAIN_VARIANT (arg_type);
3601 /* The format type and name exclude any '*' for pointers, so those
3602 must be formatted manually. For all the types we currently have,
3603 this is adequate, but formats taking pointers to functions or
3604 arrays would require the full type to be built up in order to
3605 print it with %T. */
3606 p = (char *) alloca (pointer_count + 2);
3607 if (pointer_count == 0)
3609 else if (c_dialect_cxx ())
3611 memset (p, '*', pointer_count);
3612 p[pointer_count] = 0;
3617 memset (p + 1, '*', pointer_count);
3618 p[pointer_count + 1] = 0;
3621 /* WHOLE_FMT_LOC has the caret at the end of the range.
3622 Set the caret to be at the offset from TYPE. Subtract one
3623 from the offset for the same reason as in format_warning_at_char. */
3624 substring_loc fmt_loc (whole_fmt_loc);
3625 fmt_loc.set_caret_index (type->offset_loc - 1);
3627 /* Get a string for use as a replacement fix-it hint for the range in
3628 fmt_loc, or NULL. */
3629 char *corrected_substring
3630 = get_corrected_substring (fmt_loc, type, arg_type, fki,
3631 offset_to_type_start, conversion_char);
3633 if (wanted_type_name)
3636 format_warning_at_substring
3637 (fmt_loc, param_loc,
3638 corrected_substring, OPT_Wformat_,
3639 "%s %<%s%.*s%> expects argument of type %<%s%s%>, "
3640 "but argument %d has type %qT",
3641 gettext (kind_descriptions[kind]),
3642 (kind == CF_KIND_FORMAT ? "%" : ""),
3643 format_length, format_start,
3644 wanted_type_name, p, arg_num, arg_type);
3646 format_warning_at_substring
3647 (fmt_loc, param_loc,
3648 corrected_substring, OPT_Wformat_,
3649 "%s %<%s%.*s%> expects a matching %<%s%s%> argument",
3650 gettext (kind_descriptions[kind]),
3651 (kind == CF_KIND_FORMAT ? "%" : ""),
3652 format_length, format_start, wanted_type_name, p);
3657 format_warning_at_substring
3658 (fmt_loc, param_loc,
3659 corrected_substring, OPT_Wformat_,
3660 "%s %<%s%.*s%> expects argument of type %<%T%s%>, "
3661 "but argument %d has type %qT",
3662 gettext (kind_descriptions[kind]),
3663 (kind == CF_KIND_FORMAT ? "%" : ""),
3664 format_length, format_start,
3665 wanted_type, p, arg_num, arg_type);
3667 format_warning_at_substring
3668 (fmt_loc, param_loc,
3669 corrected_substring, OPT_Wformat_,
3670 "%s %<%s%.*s%> expects a matching %<%T%s%> argument",
3671 gettext (kind_descriptions[kind]),
3672 (kind == CF_KIND_FORMAT ? "%" : ""),
3673 format_length, format_start, wanted_type, p);
3676 free (corrected_substring);
3680 /* Given a format_char_info array FCI, and a character C, this function
3681 returns the index into the conversion_specs where that specifier's
3682 data is located. The character must exist. */
3684 find_char_info_specifier_index (const format_char_info *fci, int c)
3688 for (i = 0; fci->format_chars; i++, fci++)
3689 if (strchr (fci->format_chars, c))
3692 /* We shouldn't be looking for a non-existent specifier. */
3696 /* Given a format_length_info array FLI, and a character C, this
3697 function returns the index into the conversion_specs where that
3698 modifier's data is located. The character must exist. */
3700 find_length_info_modifier_index (const format_length_info *fli, int c)
3704 for (i = 0; fli->name; i++, fli++)
3705 if (strchr (fli->name, c))
3708 /* We shouldn't be looking for a non-existent modifier. */
3712 /* Determine the type of HOST_WIDE_INT in the code being compiled for
3713 use in GCC's __asm_fprintf__ custom format attribute. You must
3714 have set dynamic_format_types before calling this function. */
3716 init_dynamic_asm_fprintf_info (void)
3722 format_length_info *new_asm_fprintf_length_specs;
3725 /* Find the underlying type for HOST_WIDE_INT. For the %w
3726 length modifier to work, one must have issued: "typedef
3727 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
3728 prior to using that modifier. */
3729 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
3732 error ("%<__gcc_host_wide_int__%> is not defined as a type");
3735 hwi = identifier_global_value (hwi);
3736 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
3738 error ("%<__gcc_host_wide_int__%> is not defined as a type");
3741 hwi = DECL_ORIGINAL_TYPE (hwi);
3743 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
3745 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
3746 " or %<long long%>");
3750 /* Create a new (writable) copy of asm_fprintf_length_specs. */
3751 new_asm_fprintf_length_specs = (format_length_info *)
3752 xmemdup (asm_fprintf_length_specs,
3753 sizeof (asm_fprintf_length_specs),
3754 sizeof (asm_fprintf_length_specs));
3756 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
3757 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
3758 if (hwi == long_integer_type_node)
3759 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
3760 else if (hwi == long_long_integer_type_node)
3761 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
3765 /* Assign the new data for use. */
3766 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
3767 new_asm_fprintf_length_specs;
3771 /* Determine the type of a "locus" in the code being compiled for use
3772 in GCC's __gcc_gfc__ custom format attribute. You must have set
3773 dynamic_format_types before calling this function. */
3775 init_dynamic_gfc_info (void)
3779 static format_char_info *gfc_fci;
3781 /* For the GCC __gcc_gfc__ custom format specifier to work, one
3782 must have declared 'locus' prior to using this attribute. If
3783 we haven't seen this declarations then you shouldn't use the
3784 specifier requiring that type. */
3785 if ((locus = maybe_get_identifier ("locus")))
3787 locus = identifier_global_value (locus);
3790 if (TREE_CODE (locus) != TYPE_DECL
3791 || TREE_TYPE (locus) == error_mark_node)
3793 error ("%<locus%> is not defined as a type");
3797 locus = TREE_TYPE (locus);
3801 /* Assign the new data for use. */
3803 /* Handle the __gcc_gfc__ format specifics. */
3805 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
3806 gfc_fci = (format_char_info *)
3807 xmemdup (gcc_gfc_char_table,
3808 sizeof (gcc_gfc_char_table),
3809 sizeof (gcc_gfc_char_table));
3812 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
3813 gfc_fci[i].types[0].type = &locus;
3814 gfc_fci[i].pointer_count = 1;
3819 /* Determine the types of "tree" and "location_t" in the code being
3820 compiled for use in GCC's diagnostic custom format attributes. You
3821 must have set dynamic_format_types before calling this function. */
3823 init_dynamic_diag_info (void)
3825 /* For the GCC-diagnostics custom format specifiers to work, one
3826 must have declared 'tree' and 'location_t' prior to using those
3827 attributes. If we haven't seen these declarations then
3828 the specifiers requiring these types shouldn't be used.
3829 However we don't force a hard ICE because we may see only one
3830 or the other type. */
3831 if (tree loc = maybe_get_identifier ("location_t"))
3833 loc = identifier_global_value (loc);
3834 if (loc && TREE_CODE (loc) != TYPE_DECL)
3835 error ("%<location_t%> is not defined as a type");
3838 /* Initialize the global tree node type local to this file. */
3839 if (!local_tree_type_node
3840 || local_tree_type_node == void_type_node)
3842 /* We need to grab the underlying 'union tree_node' so peek into
3843 an extra type level. */
3844 if ((local_tree_type_node = maybe_get_identifier ("tree")))
3846 local_tree_type_node = identifier_global_value (local_tree_type_node);
3847 if (local_tree_type_node)
3849 if (TREE_CODE (local_tree_type_node) != TYPE_DECL)
3851 error ("%<tree%> is not defined as a type");
3852 local_tree_type_node = 0;
3854 else if (TREE_CODE (TREE_TYPE (local_tree_type_node))
3857 error ("%<tree%> is not defined as a pointer type");
3858 local_tree_type_node = 0;
3861 local_tree_type_node =
3862 TREE_TYPE (TREE_TYPE (local_tree_type_node));
3866 local_tree_type_node = void_type_node;
3869 /* Similar to the above but for gcall*. */
3870 if (!local_gcall_ptr_node
3871 || local_gcall_ptr_node == void_type_node)
3873 if ((local_gcall_ptr_node = maybe_get_identifier ("gcall")))
3875 local_gcall_ptr_node
3876 = identifier_global_value (local_gcall_ptr_node);
3877 if (local_gcall_ptr_node)
3879 if (TREE_CODE (local_gcall_ptr_node) != TYPE_DECL)
3881 error ("%<gcall%> is not defined as a type");
3882 local_gcall_ptr_node = 0;
3885 local_gcall_ptr_node = TREE_TYPE (local_gcall_ptr_node);
3889 local_gcall_ptr_node = void_type_node;
3896 static format_length_info *diag_ls;
3899 /* Find the underlying type for HOST_WIDE_INT. For the 'w'
3900 length modifier to work, one must have issued: "typedef
3901 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
3902 prior to using that modifier. */
3903 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
3905 hwi = identifier_global_value (hwi);
3908 if (TREE_CODE (hwi) != TYPE_DECL)
3910 error ("%<__gcc_host_wide_int__%> is not defined as a type");
3915 hwi = DECL_ORIGINAL_TYPE (hwi);
3917 if (hwi != long_integer_type_node
3918 && hwi != long_long_integer_type_node)
3920 error ("%<__gcc_host_wide_int__%> is not defined"
3921 " as %<long%> or %<long long%>");
3928 /* Assign the new data for use. */
3930 /* All the GCC diag formats use the same length specs. */
3932 dynamic_format_types[gcc_diag_format_type].length_char_specs =
3933 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
3934 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
3935 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
3936 diag_ls = (format_length_info *)
3937 xmemdup (gcc_diag_length_specs,
3938 sizeof (gcc_diag_length_specs),
3939 sizeof (gcc_diag_length_specs));
3942 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
3943 i = find_length_info_modifier_index (diag_ls, 'w');
3944 if (hwi == long_integer_type_node)
3945 diag_ls[i].index = FMT_LEN_l;
3946 else if (hwi == long_long_integer_type_node)
3947 diag_ls[i].index = FMT_LEN_ll;
3953 /* It's safe to "re-initialize these to the same values. */
3954 dynamic_format_types[gcc_diag_format_type].conversion_specs =
3955 gcc_diag_char_table;
3956 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
3957 gcc_tdiag_char_table;
3958 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
3959 gcc_cdiag_char_table;
3960 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
3961 gcc_cxxdiag_char_table;
3964 #ifdef TARGET_FORMAT_TYPES
3965 extern const format_kind_info TARGET_FORMAT_TYPES[];
3968 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
3969 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
3971 #ifdef TARGET_OVERRIDES_FORMAT_INIT
3972 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
3975 /* Attributes such as "printf" are equivalent to those such as
3976 "gnu_printf" unless this is overridden by a target. */
3977 static const target_ovr_attr gnu_target_overrides_format_attributes[] =
3979 { "gnu_printf", "printf" },
3980 { "gnu_scanf", "scanf" },
3981 { "gnu_strftime", "strftime" },
3982 { "gnu_strfmon", "strfmon" },
3986 /* Translate to unified attribute name. This is used in decode_format_type and
3987 decode_format_attr. In attr_name the user specified argument is passed. It
3988 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
3989 or the attr_name passed to this function, if there is no matching entry. */
3991 convert_format_name_to_system_name (const char *attr_name)
3995 if (attr_name == NULL || *attr_name == 0
3996 || strncmp (attr_name, "gcc_", 4) == 0)
3998 #ifdef TARGET_OVERRIDES_FORMAT_INIT
3999 TARGET_OVERRIDES_FORMAT_INIT ();
4002 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
4003 /* Check if format attribute is overridden by target. */
4004 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
4005 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
4007 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
4009 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
4012 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
4014 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
4018 /* Otherwise default to gnu format. */
4020 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
4023 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
4026 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
4028 return gnu_target_overrides_format_attributes[i].named_attr_src;
4034 /* Handle a "format" attribute; arguments as in
4035 struct attribute_spec.handler. */
4037 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
4038 int flags, bool *no_add_attrs)
4041 function_format_info info;
4043 #ifdef TARGET_FORMAT_TYPES
4044 /* If the target provides additional format types, we need to
4045 add them to FORMAT_TYPES at first use. */
4046 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
4048 dynamic_format_types = XNEWVEC (format_kind_info,
4049 n_format_types + TARGET_N_FORMAT_TYPES);
4050 memcpy (dynamic_format_types, format_types_orig,
4051 sizeof (format_types_orig));
4052 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
4053 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
4055 format_types = dynamic_format_types;
4056 /* Provide a reference for the first potential external type. */
4057 first_target_format_type = n_format_types;
4058 n_format_types += TARGET_N_FORMAT_TYPES;
4062 /* Canonicalize name of format function. */
4063 if (TREE_CODE (TREE_VALUE (args)) == IDENTIFIER_NODE)
4064 TREE_VALUE (args) = canonicalize_attr_name (TREE_VALUE (args));
4066 if (!decode_format_attr (args, &info, 0))
4068 *no_add_attrs = true;
4072 if (prototype_p (type))
4074 if (!check_format_string (type, info.format_num, flags,
4075 no_add_attrs, info.format_type))
4078 if (info.first_arg_num != 0)
4080 unsigned HOST_WIDE_INT arg_num = 1;
4081 function_args_iterator iter;
4084 /* Verify that first_arg_num points to the last arg,
4086 FOREACH_FUNCTION_ARGS (type, arg_type, iter)
4089 if (arg_num != info.first_arg_num)
4091 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
4092 error ("args to be formatted is not %<...%>");
4093 *no_add_attrs = true;
4099 /* Check if this is a strftime variant. Just for this variant
4100 FMT_FLAG_ARG_CONVERT is not set. */
4101 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
4102 && info.first_arg_num != 0)
4104 error ("strftime formats cannot format arguments");
4105 *no_add_attrs = true;
4109 /* If this is a custom GCC-internal format type, we have to
4110 initialize certain bits at runtime. */
4111 if (info.format_type == asm_fprintf_format_type
4112 || info.format_type == gcc_gfc_format_type
4113 || info.format_type == gcc_diag_format_type
4114 || info.format_type == gcc_tdiag_format_type
4115 || info.format_type == gcc_cdiag_format_type
4116 || info.format_type == gcc_cxxdiag_format_type)
4118 /* Our first time through, we have to make sure that our
4119 format_type data is allocated dynamically and is modifiable. */
4120 if (!dynamic_format_types)
4121 format_types = dynamic_format_types = (format_kind_info *)
4122 xmemdup (format_types_orig, sizeof (format_types_orig),
4123 sizeof (format_types_orig));
4125 /* If this is format __asm_fprintf__, we have to initialize
4126 GCC's notion of HOST_WIDE_INT for checking %wd. */
4127 if (info.format_type == asm_fprintf_format_type)
4128 init_dynamic_asm_fprintf_info ();
4129 /* If this is format __gcc_gfc__, we have to initialize GCC's
4130 notion of 'locus' at runtime for %L. */
4131 else if (info.format_type == gcc_gfc_format_type)
4132 init_dynamic_gfc_info ();
4133 /* If this is one of the diagnostic attributes, then we have to
4134 initialize 'location_t' and 'tree' at runtime. */
4135 else if (info.format_type == gcc_diag_format_type
4136 || info.format_type == gcc_tdiag_format_type
4137 || info.format_type == gcc_cdiag_format_type
4138 || info.format_type == gcc_cxxdiag_format_type)
4139 init_dynamic_diag_info ();
4149 namespace selftest {
4151 /* Selftests of location handling. */
4153 /* Get the format_kind_info with the given name. */
4155 static const format_kind_info *
4156 get_info (const char *name)
4158 int idx = decode_format_type (name);
4159 const format_kind_info *fki = &format_types[idx];
4160 ASSERT_STREQ (fki->name, name);
4164 /* Verify that get_format_for_type (FKI, TYPE, CONVERSION_CHAR)
4165 is EXPECTED_FORMAT. */
4168 assert_format_for_type_streq (const location &loc, const format_kind_info *fki,
4169 const char *expected_format, tree type,
4170 char conversion_char)
4173 gcc_assert (expected_format);
4176 char *actual_format = get_format_for_type (fki, type, conversion_char);
4177 ASSERT_STREQ_AT (loc, expected_format, actual_format);
4178 free (actual_format);
4181 /* Selftests for get_format_for_type. */
4183 #define ASSERT_FORMAT_FOR_TYPE_STREQ(EXPECTED_FORMAT, TYPE, CONVERSION_CHAR) \
4184 assert_format_for_type_streq (SELFTEST_LOCATION, (fki), (EXPECTED_FORMAT), \
4185 (TYPE), (CONVERSION_CHAR))
4187 /* Selftest for get_format_for_type for "printf"-style functions. */
4190 test_get_format_for_type_printf ()
4192 const format_kind_info *fki = get_info ("gnu_printf");
4193 ASSERT_NE (fki, NULL);
4195 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'i');
4196 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'i');
4197 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'o');
4198 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'o');
4199 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'x');
4200 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'x');
4201 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'X');
4202 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'X');
4203 ASSERT_FORMAT_FOR_TYPE_STREQ ("d", integer_type_node, 'd');
4204 ASSERT_FORMAT_FOR_TYPE_STREQ ("i", integer_type_node, 'i');
4205 ASSERT_FORMAT_FOR_TYPE_STREQ ("o", integer_type_node, 'o');
4206 ASSERT_FORMAT_FOR_TYPE_STREQ ("x", integer_type_node, 'x');
4207 ASSERT_FORMAT_FOR_TYPE_STREQ ("X", integer_type_node, 'X');
4208 ASSERT_FORMAT_FOR_TYPE_STREQ ("d", unsigned_type_node, 'd');
4209 ASSERT_FORMAT_FOR_TYPE_STREQ ("i", unsigned_type_node, 'i');
4210 ASSERT_FORMAT_FOR_TYPE_STREQ ("o", unsigned_type_node, 'o');
4211 ASSERT_FORMAT_FOR_TYPE_STREQ ("x", unsigned_type_node, 'x');
4212 ASSERT_FORMAT_FOR_TYPE_STREQ ("X", unsigned_type_node, 'X');
4213 ASSERT_FORMAT_FOR_TYPE_STREQ ("ld", long_integer_type_node, 'd');
4214 ASSERT_FORMAT_FOR_TYPE_STREQ ("li", long_integer_type_node, 'i');
4215 ASSERT_FORMAT_FOR_TYPE_STREQ ("lx", long_integer_type_node, 'x');
4216 ASSERT_FORMAT_FOR_TYPE_STREQ ("lo", long_unsigned_type_node, 'o');
4217 ASSERT_FORMAT_FOR_TYPE_STREQ ("lx", long_unsigned_type_node, 'x');
4218 ASSERT_FORMAT_FOR_TYPE_STREQ ("lld", long_long_integer_type_node, 'd');
4219 ASSERT_FORMAT_FOR_TYPE_STREQ ("lli", long_long_integer_type_node, 'i');
4220 ASSERT_FORMAT_FOR_TYPE_STREQ ("llo", long_long_unsigned_type_node, 'o');
4221 ASSERT_FORMAT_FOR_TYPE_STREQ ("llx", long_long_unsigned_type_node, 'x');
4222 ASSERT_FORMAT_FOR_TYPE_STREQ ("s", build_pointer_type (char_type_node), 'i');
4225 /* Selftest for get_format_for_type for "scanf"-style functions. */
4228 test_get_format_for_type_scanf ()
4230 const format_kind_info *fki = get_info ("gnu_scanf");
4231 ASSERT_NE (fki, NULL);
4232 ASSERT_FORMAT_FOR_TYPE_STREQ ("d", build_pointer_type (integer_type_node), 'd');
4233 ASSERT_FORMAT_FOR_TYPE_STREQ ("u", build_pointer_type (unsigned_type_node), 'u');
4234 ASSERT_FORMAT_FOR_TYPE_STREQ ("ld",
4235 build_pointer_type (long_integer_type_node), 'd');
4236 ASSERT_FORMAT_FOR_TYPE_STREQ ("lu",
4237 build_pointer_type (long_unsigned_type_node), 'u');
4238 ASSERT_FORMAT_FOR_TYPE_STREQ
4239 ("lld", build_pointer_type (long_long_integer_type_node), 'd');
4240 ASSERT_FORMAT_FOR_TYPE_STREQ
4241 ("llu", build_pointer_type (long_long_unsigned_type_node), 'u');
4242 ASSERT_FORMAT_FOR_TYPE_STREQ ("e", build_pointer_type (float_type_node), 'e');
4243 ASSERT_FORMAT_FOR_TYPE_STREQ ("le", build_pointer_type (double_type_node), 'e');
4246 #undef ASSERT_FORMAT_FOR_TYPE_STREQ
4248 /* Run all of the selftests within this file. */
4253 test_get_modifier_for_format_len ();
4254 test_get_format_for_type_printf ();
4255 test_get_format_for_type_scanf ();
4258 } // namespace selftest
4260 #endif /* CHECKING_P */
4262 #include "gt-c-family-c-format.h"