gcc80: Handle TZ specific "%+" format in strftime.
[dragonfly.git] / contrib / gcc-8.0 / gcc / c-family / c-format.c
CommitLineData
38fd1498 1/* Check calls to formatted I/O functions (-Wformat).
2 Copyright (C) 1992-2018 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3. If not see
18<http://www.gnu.org/licenses/>. */
19
20#include "config.h"
21#include "system.h"
22#include "coretypes.h"
23#include "tm.h"
24#include "c-target.h"
25#include "c-common.h"
26#include "alloc-pool.h"
27#include "stringpool.h"
28#include "c-objc.h"
29#include "intl.h"
30#include "langhooks.h"
31#include "c-format.h"
32#include "diagnostic.h"
33#include "substring-locations.h"
34#include "selftest.h"
35#include "builtins.h"
36#include "attribs.h"
37
38/* Handle attributes associated with format checking. */
39
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. */
43enum 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};
49
50struct function_format_info
51{
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) */
55};
56
57/* Initialized in init_dynamic_diag_info. */
58static GTY(()) tree local_tree_type_node;
59static GTY(()) tree local_gcall_ptr_node;
60static GTY(()) tree locus;
61
62static bool decode_format_attr (tree, function_format_info *, int);
63static int decode_format_type (const char *);
64
65static 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);
69static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
70 int validated_p);
71static const char *convert_format_name_to_system_name (const char *attr_name);
72
73static int first_target_format_type;
74static const char *format_name (int format_num);
75static int format_flags (int format_num);
76
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. */
80
81ATTRIBUTE_GCC_DIAG (5,6)
82static bool
83format_warning_at_char (location_t fmt_string_loc, tree format_string_cst,
84 int char_idx, int opt, const char *gmsgid, ...)
85{
86 va_list ap;
87 va_start (ap, gmsgid);
88 tree string_type = TREE_TYPE (format_string_cst);
89
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. */
96 char_idx -= 1;
97
98 substring_loc fmt_loc (fmt_string_loc, string_type, char_idx, char_idx,
99 char_idx);
100 bool warned = format_warning_va (fmt_loc, UNKNOWN_LOCATION, NULL, opt,
101 gmsgid, &ap);
102 va_end (ap);
103
104 return warned;
105}
106
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.
114
115 The function returns true if strref points to any string type valid for the
116 language dialect and target. */
117
118static bool
119valid_stringptr_type_p (tree strref)
120{
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)));
126}
127
128/* Handle a "format_arg" attribute; arguments as in
129 struct attribute_spec.handler. */
130tree
131handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
132 tree args, int flags, bool *no_add_attrs)
133{
134 tree type = *node;
135 tree format_num_expr = TREE_VALUE (args);
136 unsigned HOST_WIDE_INT format_num = 0;
137
138 if (!get_constant (format_num_expr, &format_num, 0))
139 {
140 error ("format string has invalid operand number");
141 *no_add_attrs = true;
142 return NULL_TREE;
143 }
144
145 if (prototype_p (type))
146 {
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))
150 return NULL_TREE;
151 }
152
153 if (!valid_stringptr_type_p (TREE_TYPE (type)))
154 {
155 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
156 error ("function does not return string type");
157 *no_add_attrs = true;
158 return NULL_TREE;
159 }
160
161 return NULL_TREE;
162}
163
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
167 checked. */
168static bool
169check_format_string (tree fntype, unsigned HOST_WIDE_INT format_num,
170 int flags, bool *no_add_attrs, int expected_format_type)
171{
172 unsigned HOST_WIDE_INT i;
173 bool is_objc_sref, is_target_sref, is_char_ref;
174 tree ref;
175 int fmt_flags;
176 function_args_iterator iter;
177
178 i = 1;
179 FOREACH_FUNCTION_ARGS (fntype, ref, iter)
180 {
181 if (i == format_num)
182 break;
183 i++;
184 }
185
186 if (!ref
187 || !valid_stringptr_type_p (ref))
188 {
189 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
190 error ("format string argument is not a string type");
191 *no_add_attrs = true;
192 return false;
193 }
194
195 /* We only know that we want a suitable string reference. */
196 if (expected_format_type < 0)
197 return true;
198
199 /* Now check that the arg matches the expected type. */
200 is_char_ref =
201 (TYPE_MAIN_VARIANT (TREE_TYPE (ref)) == char_type_node);
202
203 fmt_flags = format_flags (expected_format_type);
204 is_objc_sref = is_target_sref = false;
205 if (!is_char_ref)
206 is_objc_sref = objc_string_ref_type_p (ref);
207
208 if (!(fmt_flags & FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL))
209 {
210 if (is_char_ref)
211 return true; /* OK, we expected a char and found one. */
212 else
213 {
214 /* We expected a char but found an extended string type. */
215 if (is_objc_sref)
216 error ("found a %qs reference but the format argument should"
217 " be a string", format_name (gcc_objc_string_format_type));
218 else
219 error ("found a %qT but the format argument should be a string",
220 ref);
221 *no_add_attrs = true;
222 return false;
223 }
224 }
225
226 /* We expect a string object type as the format arg. */
227 if (is_char_ref)
228 {
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;
232 return false;
233 }
234
235 /* We will assert that objective-c will support either its own string type
236 or the target-supplied variant. */
237 if (!is_objc_sref)
238 is_target_sref = (*targetcm.string_object_ref_type_p) ((const_tree) ref);
239
240 if (expected_format_type == (int) gcc_objc_string_format_type
241 && (is_objc_sref || is_target_sref))
242 return true;
243
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
247 && is_target_sref)
248 return true;
249 else
250 {
251 error ("format argument should be a %qs reference",
252 format_name (expected_format_type));
253 *no_add_attrs = true;
254 return false;
255 }
256
257 gcc_unreachable ();
258}
259
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. */
263static bool
264get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
265{
266 if (!tree_fits_uhwi_p (expr))
267 {
268 gcc_assert (!validated_p);
269 return false;
270 }
271
272 *value = TREE_INT_CST_LOW (expr);
273
274 return true;
275}
276
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. */
283
284static bool
285decode_format_attr (tree args, function_format_info *info, int validated_p)
286{
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)));
291
292 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
293 {
294 gcc_assert (!validated_p);
295 error ("unrecognized format specifier");
296 return false;
297 }
298 else
299 {
300 const char *p = IDENTIFIER_POINTER (format_type_id);
301
302 p = convert_format_name_to_system_name (p);
303
304 info->format_type = decode_format_type (p);
305
306 if (!c_dialect_objc ()
307 && info->format_type == gcc_objc_string_format_type)
308 {
309 gcc_assert (!validated_p);
310 warning (OPT_Wformat_, "%qE is only allowed in Objective-C dialects",
311 format_type_id);
312 info->format_type = format_type_error;
313 return false;
314 }
315
316 if (info->format_type == format_type_error)
317 {
318 gcc_assert (!validated_p);
319 warning (OPT_Wformat_, "%qE is an unrecognized format function type",
320 format_type_id);
321 return false;
322 }
323 }
324
325 if (!get_constant (format_num_expr, &info->format_num, validated_p))
326 {
327 error ("format string has invalid operand number");
328 return false;
329 }
330
331 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
332 {
333 error ("%<...%> has invalid operand number");
334 return false;
335 }
336
337 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
338 {
339 gcc_assert (!validated_p);
340 error ("format string argument follows the args to be formatted");
341 return false;
342 }
343
344 return true;
345}
346\f
347/* Check a call to a format function against a parameter list. */
348
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 \
355 : (flag_isoc99 \
356 ? STD_C99 \
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" \
363 : "ISO C++11") \
364 : ((FEATURE_VER) == STD_EXT \
365 ? "ISO C" \
366 : "ISO C90"))
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) \
371 : (VER)))
372
373/* Enum describing the kind of specifiers present in the format and
374 requiring an argument. */
375enum format_specifier_kind {
376 CF_KIND_FORMAT,
377 CF_KIND_FIELD_WIDTH,
378 CF_KIND_FIELD_PRECISION
379};
380
381static const char *kind_descriptions[] = {
382 N_("format"),
383 N_("field width specifier"),
384 N_("field precision specifier")
385};
386
387/* Structure describing details of a type expected in format checking,
388 and the type to check against it. */
389struct format_wanted_type
390{
391 /* The type wanted. */
392 tree wanted_type;
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. */
398 int pointer_count;
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. */
404 int writing_in_flag;
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. */
414 int format_length;
415 /* The actual parameter to check against the wanted type. */
416 tree param;
417 /* The argument number of that parameter. */
418 int arg_num;
419 /* The offset location of this argument with respect to the format
420 string location. */
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;
424};
425
426/* Convenience macro for format_length_info meaning unused. */
427#define NO_FMT NULL, FMT_LEN_none, STD_C89
428
429static const format_length_info printf_length_specs[] =
430{
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 }
442};
443
444/* Length specifiers valid for asm_fprintf. */
445static const format_length_info asm_fprintf_length_specs[] =
446{
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 }
450};
451
452/* Length specifiers valid for GCC diagnostics. */
453static const format_length_info gcc_diag_length_specs[] =
454{
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 }
458};
459
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
464
465/* This differs from printf_length_specs only in that "Z" is not accepted. */
466static const format_length_info scanf_length_specs[] =
467{
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 }
478};
479
480
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. */
483static const format_length_info strfmon_length_specs[] =
484{
485 /* A GNU extension. */
486 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
487 { NO_FMT, NO_FMT, 0 }
488};
489
490
491/* For now, the Fortran front-end routines only use l as length modifier. */
492static const format_length_info gcc_gfc_length_specs[] =
493{
494 { "l", FMT_LEN_l, STD_C89, NO_FMT, 0 },
495 { NO_FMT, NO_FMT, 0 }
496};
497
498
499static const format_flag_spec printf_flag_specs[] =
500{
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 }
512};
513
514
515static const format_flag_pair printf_flag_pairs[] =
516{
517 { ' ', '+', 1, 0 },
518 { '0', '-', 1, 0 },
519 { '0', 'p', 1, 'i' },
520 { 0, 0, 0, 0 }
521};
522
523static const format_flag_spec asm_fprintf_flag_specs[] =
524{
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 }
534};
535
536static const format_flag_pair asm_fprintf_flag_pairs[] =
537{
538 { ' ', '+', 1, 0 },
539 { '0', '-', 1, 0 },
540 { '0', 'p', 1, 'i' },
541 { 0, 0, 0, 0 }
542};
543
544static const format_flag_pair gcc_diag_flag_pairs[] =
545{
546 { 0, 0, 0, 0 }
547};
548
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
553
554static const format_flag_spec gcc_diag_flag_specs[] =
555{
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 }
562};
563
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
568
569static const format_flag_spec scanf_flag_specs[] =
570{
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 }
579};
580
581
582static const format_flag_pair scanf_flag_pairs[] =
583{
584 { '*', 'L', 0, 0 },
585 { 'a', 'm', 0, 0 },
586 { 0, 0, 0, 0 }
587};
588
589
590static const format_flag_spec strftime_flag_specs[] =
591{
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 }
602};
603
604
605static const format_flag_pair strftime_flag_pairs[] =
606{
607 { 'E', 'O', 0, 0 },
608 { '_', '-', 0, 0 },
609 { '_', '0', 0, 0 },
610 { '-', '0', 0, 0 },
611 { '^', '#', 0, 0 },
612 { 0, 0, 0, 0 }
613};
614
615
616static const format_flag_spec strfmon_flag_specs[] =
617{
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 }
629};
630
631static const format_flag_pair strfmon_flag_pairs[] =
632{
633 { '+', '(', 0, 0 },
634 { 0, 0, 0, 0 }
635};
636
637
638static const format_char_info print_char_table[] =
639{
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 }
659};
660
661static const format_char_info asm_fprintf_char_table[] =
662{
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 },
669
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 }
680};
681
682static const format_char_info gcc_diag_char_table[] =
683{
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 },
691
692 /* Custom conversion specifiers. */
693
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 },
698
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 }
706};
707
708static const format_char_info gcc_tdiag_char_table[] =
709{
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 },
717
718 /* Custom conversion specifiers. */
719
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 },
724
725 /* G requires a "gcall*" argument at runtime. */
726 { "G", 1, STD_C89, { T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL },
727
728 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
729
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 }
738};
739
740static const format_char_info gcc_cdiag_char_table[] =
741{
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 },
749
750 /* Custom conversion specifiers. */
751
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 },
756
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 },
759
760 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
761
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 }
770};
771
772static const format_char_info gcc_cxxdiag_char_table[] =
773{
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 },
781
782 /* Custom conversion specifiers. */
783
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 },
789
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 },
792
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 },
795
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 }
804};
805
806static const format_char_info gcc_gfc_char_table[] =
807{
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 },
813
814 /* gfc conversion specifiers. */
815
816 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
817
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 },
820
821 /* These will require nothing. */
822 { "<>",0, STD_C89, NOARGUMENTS, "", "", NULL },
823 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
824};
825
826static const format_char_info scan_char_table[] =
827{
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 }
845};
846
847static const format_char_info time_char_table[] =
848{
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 },
a69def15 871#if 1 /* DragonFly base: strftime() %+ specifier. */
872 { "+", 0, STD_EXT, NOLENGTHS, "E", "3", NULL },
873#endif
38fd1498 874 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
875};
876
877static const format_char_info monetary_char_table[] =
878{
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 }
881};
882
883/* This must be in the same order as enum format_type. */
884static const format_kind_info format_types_orig[] =
885{
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
891 },
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,
896 NULL, NULL
897 },
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
903 },
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
909 },
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
915 },
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
921 },
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,
925 0, 0, 0, 0, 0, 0,
926 NULL, NULL
927 },
928 { "NSString", NULL, NULL, NULL, NULL,
929 NULL, NULL,
930 FMT_FLAG_ARG_CONVERT|FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL, 0, 0, 0, 0, 0, 0,
931 NULL, NULL
932 },
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',
937 NULL, NULL
938 },
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,
942 NULL, NULL
943 },
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,
947 NULL, NULL
948 }
949};
950
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
953 const. */
954static 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. */
957static format_kind_info *dynamic_format_types;
958
959static int n_format_types = ARRAY_SIZE (format_types_orig);
960
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. */
964struct format_check_results
965{
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
975 numbers. */
976 int number_dollar_extra_args;
977 /* Number of leaves of the format argument that were wide string
978 literals. */
979 int number_wide;
980 /* Number of leaves of the format argument that were empty strings. */
981 int number_empty;
982 /* Number of leaves of the format argument that were unterminated
983 strings. */
984 int number_unterminated;
985 /* Number of leaves of the format argument that were not counted above. */
986 int number_other;
987 /* Location of the format string. */
988 location_t format_string_loc;
989};
990
991struct format_check_context
992{
993 format_check_results *res;
994 function_format_info *info;
995 tree params;
996 vec<location_t> *arglocs;
997};
998
999/* Return the format name (as specified in the original table) for the format
1000 type indicated by format_num. */
1001static const char *
1002format_name (int format_num)
1003{
1004 if (format_num >= 0 && format_num < n_format_types)
1005 return format_types[format_num].name;
1006 gcc_unreachable ();
1007}
1008
1009/* Return the format flags (as specified in the original table) for the format
1010 type indicated by format_num. */
1011static int
1012format_flags (int format_num)
1013{
1014 if (format_num >= 0 && format_num < n_format_types)
1015 return format_types[format_num].flags;
1016 gcc_unreachable ();
1017}
1018
1019static void check_format_info (function_format_info *, tree,
1020 vec<location_t> *);
1021static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
1022static void check_format_info_main (format_check_results *,
1023 function_format_info *, const char *,
1024 location_t, tree,
1025 int, tree,
1026 unsigned HOST_WIDE_INT,
1027 object_allocator<format_wanted_type> &,
1028 vec<location_t> *);
1029
1030static void init_dollar_format_checking (int, tree);
1031static int maybe_read_dollar_number (const char **, int,
1032 tree, tree *, const format_kind_info *);
1033static bool avoid_dollar_number (const char *);
1034static void finish_dollar_format_checking (format_check_results *, int);
1035
1036static const format_flag_spec *get_flag_spec (const format_flag_spec *,
1037 int, const char *);
1038
1039static 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);
1045static void format_type_warning (const substring_loc &fmt_loc,
1046 location_t param_loc,
1047 format_wanted_type *, tree,
1048 tree,
1049 const format_kind_info *fki,
1050 int offset_to_type_start,
1051 char conversion_char);
1052
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
1055 error message. */
1056static int
1057decode_format_type (const char *s)
1058{
1059 int i;
1060 int slen;
1061
1062 s = convert_format_name_to_system_name (s);
1063 slen = strlen (s);
1064 for (i = 0; i < n_format_types; i++)
1065 {
1066 int alen;
1067 if (!strcmp (s, format_types[i].name))
1068 return i;
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))
1073 return i;
1074 }
1075 return format_type_error;
1076}
1077
1078\f
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. */
1085
1086void
1087check_function_format (tree attrs, int nargs, tree *argarray,
1088 vec<location_t> *arglocs)
1089{
1090 tree a;
1091
1092 /* See if this function has any format attributes. */
1093 for (a = attrs; a; a = TREE_CHAIN (a))
1094 {
1095 if (is_attribute_p ("format", TREE_PURPOSE (a)))
1096 {
1097 /* Yup; check it. */
1098 function_format_info info;
1099 decode_format_attr (TREE_VALUE (a), &info, /*validated=*/true);
1100 if (warn_format)
1101 {
1102 /* FIXME: Rewrite all the internal functions in this file
1103 to use the ARGARRAY directly instead of constructing this
1104 temporary list. */
1105 tree params = NULL_TREE;
1106 int i;
1107 for (i = nargs - 1; i >= 0; i--)
1108 params = tree_cons (NULL_TREE, argarray[i], params);
1109 check_format_info (&info, params, arglocs);
1110 }
1111
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))
1124 {
1125 tree c;
1126 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
1127 c;
1128 c = TREE_CHAIN (c))
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))
1133 break;
1134 if (c == NULL_TREE)
1135 {
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. */
1140 tree args;
1141 for (args = DECL_ARGUMENTS (current_function_decl);
1142 args != 0;
1143 args = DECL_CHAIN (args))
1144 {
1145 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
1146 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
1147 == char_type_node))
1148 break;
1149 }
1150 if (args != 0)
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);
1155 }
1156 }
1157 }
1158 }
1159}
1160
1161
1162/* Variables used by the checking of $ operand number formats. */
1163static char *dollar_arguments_used = NULL;
1164static char *dollar_arguments_pointer_p = NULL;
1165static int dollar_arguments_alloc = 0;
1166static int dollar_arguments_count;
1167static int dollar_first_arg_num;
1168static int dollar_max_arg_used;
1169static int dollar_format_warned;
1170
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. */
1176
1177static void
1178init_dollar_format_checking (int first_arg_num, tree params)
1179{
1180 tree oparams = params;
1181
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)
1187 {
1188 while (params)
1189 {
1190 dollar_arguments_count++;
1191 params = TREE_CHAIN (params);
1192 }
1193 }
1194 if (dollar_arguments_alloc < dollar_arguments_count)
1195 {
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);
1201 }
1202 if (dollar_arguments_alloc)
1203 {
1204 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1205 if (first_arg_num > 0)
1206 {
1207 int i = 0;
1208 params = oparams;
1209 while (params)
1210 {
1211 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1212 == POINTER_TYPE);
1213 params = TREE_CHAIN (params);
1214 i++;
1215 }
1216 }
1217 }
1218}
1219
1220
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. */
1229
1230static int
1231maybe_read_dollar_number (const char **format,
1232 int dollar_needed, tree params, tree *param_ptr,
1233 const format_kind_info *fki)
1234{
1235 int argnum;
1236 int overflow_flag;
1237 const char *fcp = *format;
1238 if (!ISDIGIT (*fcp))
1239 {
1240 if (dollar_needed)
1241 {
1242 warning (OPT_Wformat_, "missing $ operand number in format");
1243 return -1;
1244 }
1245 else
1246 return 0;
1247 }
1248 argnum = 0;
1249 overflow_flag = 0;
1250 while (ISDIGIT (*fcp))
1251 {
1252 int nargnum;
1253 nargnum = 10 * argnum + (*fcp - '0');
1254 if (nargnum < 0 || nargnum / 10 != argnum)
1255 overflow_flag = 1;
1256 argnum = nargnum;
1257 fcp++;
1258 }
1259 if (*fcp != '$')
1260 {
1261 if (dollar_needed)
1262 {
1263 warning (OPT_Wformat_, "missing $ operand number in format");
1264 return -1;
1265 }
1266 else
1267 return 0;
1268 }
1269 *format = fcp + 1;
1270 if (pedantic && !dollar_format_warned)
1271 {
1272 warning (OPT_Wformat_, "%s does not support %%n$ operand number formats",
1273 C_STD_NAME (STD_EXT));
1274 dollar_format_warned = 1;
1275 }
1276 if (overflow_flag || argnum == 0
1277 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1278 {
1279 warning (OPT_Wformat_, "operand number out of range in format");
1280 return -1;
1281 }
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)
1287 {
1288 int nalloc;
1289 nalloc = 2 * dollar_arguments_alloc + 16;
1290 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1291 nalloc);
1292 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1293 nalloc);
1294 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1295 nalloc - dollar_arguments_alloc);
1296 dollar_arguments_alloc = nalloc;
1297 }
1298 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1299 && dollar_arguments_used[argnum - 1] == 1)
1300 {
1301 dollar_arguments_used[argnum - 1] = 2;
1302 warning (OPT_Wformat_, "format argument %d used more than once in %s format",
1303 argnum, fki->name);
1304 }
1305 else
1306 dollar_arguments_used[argnum - 1] = 1;
1307 if (dollar_first_arg_num)
1308 {
1309 int i;
1310 *param_ptr = params;
1311 for (i = 1; i < argnum && *param_ptr != 0; i++)
1312 *param_ptr = TREE_CHAIN (*param_ptr);
1313
1314 /* This case shouldn't be caught here. */
1315 gcc_assert (*param_ptr);
1316 }
1317 else
1318 *param_ptr = 0;
1319 return argnum;
1320}
1321
1322/* Ensure that FORMAT does not start with a decimal number followed by
1323 a $; give a diagnostic and return true if it does, false otherwise. */
1324
1325static bool
1326avoid_dollar_number (const char *format)
1327{
1328 if (!ISDIGIT (*format))
1329 return false;
1330 while (ISDIGIT (*format))
1331 format++;
1332 if (*format == '$')
1333 {
1334 warning (OPT_Wformat_, "$ operand number used after format without operand number");
1335 return true;
1336 }
1337 return false;
1338}
1339
1340
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
1349 pointers. */
1350
1351static void
1352finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1353{
1354 int i;
1355 bool found_pointer_gap = false;
1356 for (i = 0; i < dollar_max_arg_used; i++)
1357 {
1358 if (!dollar_arguments_used[i])
1359 {
1360 if (pointer_gap_ok && (dollar_first_arg_num == 0
1361 || dollar_arguments_pointer_p[i]))
1362 found_pointer_gap = true;
1363 else
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);
1367 }
1368 }
1369 if (found_pointer_gap
1370 || (dollar_first_arg_num
1371 && dollar_max_arg_used < dollar_arguments_count))
1372 {
1373 res->number_other--;
1374 res->number_dollar_extra_args++;
1375 }
1376}
1377
1378
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. */
1386
1387static const format_flag_spec *
1388get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1389{
1390 int i;
1391 for (i = 0; spec[i].flag_char != 0; i++)
1392 {
1393 if (spec[i].flag_char != flag)
1394 continue;
1395 if (predicates != NULL)
1396 {
1397 if (spec[i].predicate != 0
1398 && strchr (predicates, spec[i].predicate) != 0)
1399 return &spec[i];
1400 }
1401 else if (spec[i].predicate == 0)
1402 return &spec[i];
1403 }
1404 gcc_assert (predicates);
1405 return NULL;
1406}
1407
1408
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. */
1412
1413static void
1414check_format_info (function_format_info *info, tree params,
1415 vec<location_t> *arglocs)
1416{
1417 format_check_context format_ctx;
1418 unsigned HOST_WIDE_INT arg_num;
1419 tree format_tree;
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)
1424 {
1425 if (params == 0)
1426 return;
1427 if (arg_num == info->format_num)
1428 break;
1429 params = TREE_CHAIN (params);
1430 }
1431 format_tree = TREE_VALUE (params);
1432 params = TREE_CHAIN (params);
1433 if (format_tree == 0)
1434 return;
1435
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;
1445
1446 format_ctx.res = &res;
1447 format_ctx.info = info;
1448 format_ctx.params = params;
1449 format_ctx.arglocs = arglocs;
1450
1451 check_function_arguments_recurse (check_format_arg, &format_ctx,
1452 format_tree, arg_num);
1453
1454 location_t loc = format_ctx.res->format_string_loc;
1455
1456 if (res.number_non_literal > 0)
1457 {
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))
1462 {
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");
1467 }
1468 else if (info->first_arg_num != 0)
1469 {
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)
1473 {
1474 if (params == 0)
1475 break;
1476 params = TREE_CHAIN (params);
1477 ++arg_num;
1478 }
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");
1485 else
1486 warning_at (loc, OPT_Wformat_nonliteral,
1487 "format not a string literal, argument types not checked");
1488 }
1489 }
1490
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)
1500 {
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");
1505 }
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);
1513
1514 if (res.number_wide > 0)
1515 warning_at (loc, OPT_Wformat_, "format is a wide character string");
1516
1517 if (res.number_unterminated > 0)
1518 warning_at (loc, OPT_Wformat_, "unterminated format string");
1519}
1520
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. */
1525
1526static void
1527check_format_arg (void *ctx, tree format_tree,
1528 unsigned HOST_WIDE_INT arg_num)
1529{
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;
1535
1536 int format_length;
1537 HOST_WIDE_INT offset;
1538 const char *format_chars;
1539 tree array_size = 0;
1540 tree array_init;
1541
1542 location_t fmt_param_loc = EXPR_LOC_OR_LOC (format_tree, input_location);
1543
1544 /* Pull out a constant value if the front end didn't, and handle location
1545 wrappers. */
1546 format_tree = fold_for_warn (format_tree);
1547 STRIP_NOPS (format_tree);
1548
1549 if (integer_zerop (format_tree))
1550 {
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)
1554 {
1555 if (params == 0)
1556 return;
1557 params = TREE_CHAIN (params);
1558 ++arg_num;
1559 }
1560
1561 if (params == 0)
1562 res->number_other++;
1563 else
1564 {
1565 if (res->number_extra_args == 0)
1566 res->extra_arg_loc = EXPR_LOC_OR_LOC (TREE_VALUE (params),
1567 input_location);
1568 res->number_extra_args++;
1569 }
1570 return;
1571 }
1572
1573 offset = 0;
1574 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1575 {
1576 tree arg0, arg1;
1577
1578 arg0 = TREE_OPERAND (format_tree, 0);
1579 arg1 = TREE_OPERAND (format_tree, 1);
1580 STRIP_NOPS (arg0);
1581 STRIP_NOPS (arg1);
1582 if (TREE_CODE (arg1) == INTEGER_CST)
1583 format_tree = arg0;
1584 else
1585 {
1586 res->number_non_literal++;
1587 return;
1588 }
1589 /* POINTER_PLUS_EXPR offsets are to be interpreted signed. */
1590 if (!cst_and_fits_in_hwi (arg1))
1591 {
1592 res->number_non_literal++;
1593 return;
1594 }
1595 offset = int_cst_value (arg1);
1596 }
1597 if (TREE_CODE (format_tree) != ADDR_EXPR)
1598 {
1599 res->number_non_literal++;
1600 return;
1601 }
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)
1606 {
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
1609 a valid type. */
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))))
1614 {
1615 res->number_non_literal++;
1616 return;
1617 }
1618 /* Skip to first argument to check. */
1619 while (arg_num + 1 < info->first_arg_num)
1620 {
1621 if (params == 0)
1622 return;
1623 params = TREE_CHAIN (params);
1624 ++arg_num;
1625 }
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. */
1630 if (objc_str)
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. */
1635 return;
1636 }
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);
1641 if (offset < 0)
1642 {
1643 res->number_non_literal++;
1644 return;
1645 }
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)
1650 {
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;
1656 }
1657 if (TREE_CODE (format_tree) != STRING_CST)
1658 {
1659 res->number_non_literal++;
1660 return;
1661 }
1662 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1663 {
1664 res->number_wide++;
1665 return;
1666 }
1667 format_chars = TREE_STRING_POINTER (format_tree);
1668 format_length = TREE_STRING_LENGTH (format_tree);
1669 if (array_size != 0)
1670 {
1671 /* Variable length arrays can't be initialized. */
1672 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1673
1674 if (tree_fits_shwi_p (array_size))
1675 {
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;
1681 }
1682 }
1683 if (offset)
1684 {
1685 if (offset >= format_length)
1686 {
1687 res->number_non_literal++;
1688 return;
1689 }
1690 format_chars += offset;
1691 format_length -= offset;
1692 }
1693 if (format_length < 1 || format_chars[--format_length] != 0)
1694 {
1695 res->number_unterminated++;
1696 return;
1697 }
1698 if (format_length == 0)
1699 {
1700 res->number_empty++;
1701 return;
1702 }
1703
1704 /* Skip to first argument to check. */
1705 while (arg_num + 1 < info->first_arg_num)
1706 {
1707 if (params == 0)
1708 return;
1709 params = TREE_CHAIN (params);
1710 ++arg_num;
1711 }
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);
1719}
1720
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. */
1724
1725class flag_chars_t
1726{
1727 public:
1728 flag_chars_t ();
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,
1738 char format_char,
1739 bool quoted);
1740 int get_alloc_flag (const format_kind_info *fki);
1741 int assignment_suppression_p (const format_kind_info *fki);
1742
1743 private:
1744 char m_flag_chars[256];
1745};
1746
1747/* Support struct for argument_parser and check_format_info_main.
1748 Encapsulates any length modifier applied to the current argument. */
1749
1750struct length_modifier
1751{
1752 length_modifier ()
1753 : chars (NULL), val (FMT_LEN_none), std (STD_C89),
1754 scalar_identity_flag (0)
1755 {
1756 }
1757
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_)
1764 {
1765 }
1766
1767 const char *chars;
1768 enum format_lengths val;
1769 enum format_std_version std;
1770 int scalar_identity_flag;
1771};
1772
1773/* Parsing one argument within a format string. */
1774
1775class argument_parser
1776{
1777 public:
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);
1785
1786 bool read_any_dollar ();
1787
1788 bool read_format_flags ();
1789
1790 bool
1791 read_any_format_width (tree &params,
1792 unsigned HOST_WIDE_INT &arg_num);
1793
1794 void
1795 read_any_format_left_precision ();
1796
1797 bool
1798 read_any_format_precision (tree &params,
1799 unsigned HOST_WIDE_INT &arg_num);
1800
1801 void handle_alloc_chars ();
1802
1803 length_modifier read_any_length_modifier ();
1804
1805 void read_any_other_modifier ();
1806
1807 const format_char_info *find_format_char_info (char format_char);
1808
1809 void
1810 validate_flag_pairs (const format_char_info *fci,
1811 char format_char);
1812
1813 void
1814 give_y2k_warnings (const format_char_info *fci,
1815 char format_char);
1816
1817 void parse_any_scan_set (const format_char_info *fci);
1818
1819 bool handle_conversions (const format_char_info *fci,
1820 const length_modifier &len_modifier,
1821 tree &wanted_type,
1822 const char *&wanted_type_name,
1823 unsigned HOST_WIDE_INT &arg_num,
1824 tree &params,
1825 char format_char);
1826
1827 bool
1828 check_argument_type (const format_char_info *fci,
1829 const length_modifier &len_modifier,
1830 tree &wanted_type,
1831 const char *&wanted_type_name,
1832 const bool suppressed,
1833 unsigned HOST_WIDE_INT &arg_num,
1834 tree &params,
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);
1840
1841 private:
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;
1852 int main_arg_num;
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;
1858 public:
1859 format_wanted_type main_wanted_type;
1860 private:
1861 format_wanted_type *first_wanted_type;
1862 format_wanted_type *last_wanted_type;
1863 vec<location_t> *arglocs;
1864};
1865
1866/* flag_chars_t's constructor. */
1867
1868flag_chars_t::flag_chars_t ()
1869{
1870 m_flag_chars[0] = 0;
1871}
1872
1873/* Has CH been seen as a flag within the current argument? */
1874
1875bool
1876flag_chars_t::has_char_p (char ch) const
1877{
1878 return strchr (m_flag_chars, ch) != 0;
1879}
1880
1881/* Add CH to the flags seen within the current argument. */
1882
1883void
1884flag_chars_t::add_char (char ch)
1885{
1886 int i = strlen (m_flag_chars);
1887 m_flag_chars[i++] = ch;
1888 m_flag_chars[i] = 0;
1889}
1890
1891/* Validate the individual flags used, removing any that are invalid. */
1892
1893void
1894flag_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,
1901 char format_char,
1902 bool quoted)
1903{
1904 int i;
1905 int d = 0;
1906 bool quotflag = false;
1907
1908 for (i = 0; m_flag_chars[i] != 0; i++)
1909 {
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)
1914 continue;
1915
1916 /* Remember if a quoting flag is seen. */
1917 quotflag |= s->quoting;
1918
1919 if (strchr (fci->flag_chars, m_flag_chars[i]) == 0)
1920 {
1921 format_warning_at_char (format_string_loc, format_string_cst,
1922 format_chars - orig_format_chars,
1923 OPT_Wformat_,
1924 "%s used with %<%%%c%> %s format",
1925 _(s->name), format_char, fki->name);
1926 d++;
1927 continue;
1928 }
1929 if (pedantic)
1930 {
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))
1938 {
1939 const char *long_name = (t->long_name != NULL
1940 ? t->long_name
1941 : s->long_name);
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);
1948 }
1949 }
1950
1951 /* Detect quoting directives used within a quoted sequence, such
1952 as GCC's "%<...%qE". */
1953 if (quoted && s->quoting)
1954 {
1955 format_warning_at_char (format_string_loc, format_string_cst,
1956 format_chars - orig_format_chars - 1,
1957 OPT_Wformat_,
1958 "%s used within a quoted sequence",
1959 _(s->name));
1960 }
1961 }
1962 m_flag_chars[i - d] = 0;
1963
1964 if (!quoted
1965 && !quotflag
1966 && strchr (fci->flags2, '\''))
1967 {
1968 format_warning_at_char (format_string_loc, format_string_cst,
1969 format_chars - orig_format_chars,
1970 OPT_Wformat_,
1971 "%qc conversion used unquoted",
1972 format_char);
1973 }
1974}
1975
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. */
1979
1980int
1981flag_chars_t::get_alloc_flag (const format_kind_info *fki)
1982{
1983 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1984 && has_char_p ('a'))
1985 return 1;
1986 if (fki->alloc_char && has_char_p (fki->alloc_char))
1987 return 1;
1988 return 0;
1989}
1990
1991/* Determine if an assignment-suppression character was seen.
1992 ('*' in scanf, for discarding the converted input). */
1993
1994int
1995flag_chars_t::assignment_suppression_p (const format_kind_info *fki)
1996{
1997 if (fki->suppression_char
1998 && has_char_p (fki->suppression_char))
1999 return 1;
2000 return 0;
2001}
2002
2003/* Constructor for argument_parser. Initialize for parsing one
2004 argument within a format string. */
2005
2006argument_parser::
2007argument_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_)
2016: info (info_),
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_),
2026 main_arg_num (0),
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),
2032 arglocs (arglocs_)
2033{
2034}
2035
2036/* Handle dollars at the start of format arguments, setting up main_arg_params
2037 and main_arg_num.
2038
2039 Return true if format parsing is to continue, false otherwise. */
2040
2041bool
2042argument_parser::read_any_dollar ()
2043{
2044 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
2045 {
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 %*. */
2050 int opnum;
2051 opnum = maybe_read_dollar_number (&format_chars, 0,
2052 first_fillin_param,
2053 &main_arg_params, fki);
2054 if (opnum == -1)
2055 return false;
2056 else if (opnum > 0)
2057 {
2058 has_operand_number = 1;
2059 main_arg_num = opnum + info->first_arg_num - 1;
2060 }
2061 }
2062 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
2063 {
2064 if (avoid_dollar_number (format_chars))
2065 return false;
2066 }
2067 return true;
2068}
2069
2070/* Read any format flags, but do not yet validate them beyond removing
2071 duplicates, since in general validation depends on the rest of
2072 the format.
2073
2074 Return true if format parsing is to continue, false otherwise. */
2075
2076bool
2077argument_parser::read_format_flags ()
2078{
2079 while (*format_chars != 0
2080 && strchr (fki->flag_chars, *format_chars) != 0)
2081 {
2082 const format_flag_spec *s = get_flag_spec (flag_specs,
2083 *format_chars, NULL);
2084 if (flag_chars.has_char_p (*format_chars))
2085 {
2086 format_warning_at_char (format_string_loc, format_string_cst,
2087 format_chars + 1 - orig_format_chars,
2088 OPT_Wformat_,
2089 "repeated %s in format", _(s->name));
2090 }
2091 else
2092 flag_chars.add_char (*format_chars);
2093
2094 if (s->skip_next_char)
2095 {
2096 ++format_chars;
2097 if (*format_chars == 0)
2098 {
2099 warning_at (format_string_loc, OPT_Wformat_,
2100 "missing fill character at end of strfmon format");
2101 return false;
2102 }
2103 }
2104 ++format_chars;
2105 }
2106
2107 return true;
2108}
2109
2110/* Read any format width, possibly * or *m$.
2111
2112 Return true if format parsing is to continue, false otherwise. */
2113
2114bool
2115argument_parser::
2116read_any_format_width (tree &params,
2117 unsigned HOST_WIDE_INT &arg_num)
2118{
2119 if (!fki->width_char)
2120 return true;
2121
2122 if (fki->width_type != NULL && *format_chars == '*')
2123 {
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..." */
2127 ++format_chars;
2128 if (has_operand_number != 0)
2129 {
2130 int opnum;
2131 opnum = maybe_read_dollar_number (&format_chars,
2132 has_operand_number == 1,
2133 first_fillin_param,
2134 &params, fki);
2135 if (opnum == -1)
2136 return false;
2137 else if (opnum > 0)
2138 {
2139 has_operand_number = 1;
2140 arg_num = opnum + info->first_arg_num - 1;
2141 }
2142 else
2143 has_operand_number = 0;
2144 }
2145 else
2146 {
2147 if (avoid_dollar_number (format_chars))
2148 return false;
2149 }
2150 if (info->first_arg_num != 0)
2151 {
2152 tree cur_param;
2153 if (params == 0)
2154 cur_param = NULL;
2155 else
2156 {
2157 cur_param = TREE_VALUE (params);
2158 if (has_operand_number <= 0)
2159 {
2160 params = TREE_CHAIN (params);
2161 ++arg_num;
2162 }
2163 }
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;
2184 }
2185 }
2186 else
2187 {
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))
2193 {
2194 found_width = TRUE;
2195 if (*format_chars != '0')
2196 non_zero_width_char = TRUE;
2197 ++format_chars;
2198 }
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);
2203 if (found_width)
2204 flag_chars.add_char (fki->width_char);
2205 }
2206
2207 return true;
2208}
2209
2210/* Read any format left precision (must be a number, not *). */
2211void
2212argument_parser::read_any_format_left_precision ()
2213{
2214 if (fki->left_precision_char == 0)
2215 return;
2216 if (*format_chars != '#')
2217 return;
2218
2219 ++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,
2224 OPT_Wformat_,
2225 "empty left precision in %s format", fki->name);
2226 while (ISDIGIT (*format_chars))
2227 ++format_chars;
2228}
2229
2230/* Read any format precision, possibly * or *m$.
2231
2232 Return true if format parsing is to continue, false otherwise. */
2233
2234bool
2235argument_parser::
2236read_any_format_precision (tree &params,
2237 unsigned HOST_WIDE_INT &arg_num)
2238{
2239 if (fki->precision_char == 0)
2240 return true;
2241 if (*format_chars != '.')
2242 return true;
2243
2244 ++format_chars;
2245 flag_chars.add_char (fki->precision_char);
2246 if (fki->precision_type != NULL && *format_chars == '*')
2247 {
2248 /* "...a...precision...may be indicated by an asterisk.
2249 In this case, an int argument supplies the...precision." */
2250 ++format_chars;
2251 if (has_operand_number != 0)
2252 {
2253 int opnum;
2254 opnum = maybe_read_dollar_number (&format_chars,
2255 has_operand_number == 1,
2256 first_fillin_param,
2257 &params, fki);
2258 if (opnum == -1)
2259 return false;
2260 else if (opnum > 0)
2261 {
2262 has_operand_number = 1;
2263 arg_num = opnum + info->first_arg_num - 1;
2264 }
2265 else
2266 has_operand_number = 0;
2267 }
2268 else
2269 {
2270 if (avoid_dollar_number (format_chars))
2271 return false;
2272 }
2273 if (info->first_arg_num != 0)
2274 {
2275 tree cur_param;
2276 if (params == 0)
2277 cur_param = NULL;
2278 else
2279 {
2280 cur_param = TREE_VALUE (params);
2281 if (has_operand_number <= 0)
2282 {
2283 params = TREE_CHAIN (params);
2284 ++arg_num;
2285 }
2286 }
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;
2307 }
2308 }
2309 else
2310 {
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,
2315 OPT_Wformat_,
2316 "empty precision in %s format", fki->name);
2317 while (ISDIGIT (*format_chars))
2318 ++format_chars;
2319 }
2320
2321 return true;
2322}
2323
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). */
2329
2330void
2331argument_parser::handle_alloc_chars ()
2332{
2333 if (fki->alloc_char && fki->alloc_char == *format_chars)
2334 {
2335 flag_chars.add_char (fki->alloc_char);
2336 format_chars++;
2337 }
2338
2339 /* Handle the scanf allocation kludge. */
2340 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
2341 {
2342 if (*format_chars == 'a' && !flag_isoc99)
2343 {
2344 if (format_chars[1] == 's' || format_chars[1] == 'S'
2345 || format_chars[1] == '[')
2346 {
2347 /* 'a' is used as a flag. */
2348 flag_chars.add_char ('a');
2349 format_chars++;
2350 }
2351 }
2352 }
2353}
2354
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).
2358
2359 Issue warnings about non-standard modifiers. */
2360
2361length_modifier
2362argument_parser::read_any_length_modifier ()
2363{
2364 length_modifier result;
2365
2366 const format_length_info *fli = fki->length_char_specs;
2367 if (!fli)
2368 return result;
2369
2370 while (fli->name != 0
2371 && strncmp (fli->name, format_chars, strlen (fli->name)))
2372 fli++;
2373 if (fli->name != 0)
2374 {
2375 format_chars += strlen (fli->name);
2376 if (fli->double_name != 0 && fli->name[0] == *format_chars)
2377 {
2378 format_chars++;
2379 result = length_modifier (fli->double_name, fli->double_index,
2380 fli->double_std, 0);
2381 }
2382 else
2383 {
2384 result = length_modifier (fli->name, fli->index, fli->std,
2385 fli->scalar_identity_flag);
2386 }
2387 flag_chars.add_char (fki->length_code_char);
2388 }
2389 if (pedantic)
2390 {
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,
2396 fki->name);
2397 }
2398
2399 return result;
2400}
2401
2402/* Read any other modifier (strftime E/O). */
2403
2404void
2405argument_parser::read_any_other_modifier ()
2406{
2407 if (fki->modifier_chars == NULL)
2408 return;
2409
2410 while (*format_chars != 0
2411 && strchr (fki->modifier_chars, *format_chars) != 0)
2412 {
2413 if (flag_chars.has_char_p (*format_chars))
2414 {
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,
2419 OPT_Wformat_,
2420 "repeated %s in format", _(s->name));
2421 }
2422 else
2423 flag_chars.add_char (*format_chars);
2424 ++format_chars;
2425 }
2426}
2427
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
2431 against.
2432
2433 Issue a warning and return NULL if it is not found.
2434
2435 Issue warnings about non-standard modifiers. */
2436
2437const format_char_info *
2438argument_parser::find_format_char_info (char format_char)
2439{
2440 const format_char_info *fci = fki->conversion_specs;
2441
2442 while (fci->format_chars != 0
2443 && strchr (fci->format_chars, format_char) == 0)
2444 ++fci;
2445 if (fci->format_chars == 0)
2446 {
2447 format_warning_at_char (format_string_loc, format_string_cst,
2448 format_chars - orig_format_chars,
2449 OPT_Wformat_,
2450 "unknown conversion type character"
2451 " %qc in format",
2452 format_char);
2453 return NULL;
2454 }
2455
2456 if (pedantic)
2457 {
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,
2461 OPT_Wformat_,
2462 "%s does not support the %<%%%c%> %s format",
2463 C_STD_NAME (fci->std), format_char, fki->name);
2464 }
2465
2466 return fci;
2467}
2468
2469/* Validate the pairs of flags used.
2470 Issue warnings about incompatible combinations of flags. */
2471
2472void
2473argument_parser::validate_flag_pairs (const format_char_info *fci,
2474 char format_char)
2475{
2476 const format_flag_pair * const bad_flag_pairs = fki->bad_flag_pairs;
2477
2478 for (int i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
2479 {
2480 const format_flag_spec *s, *t;
2481 if (!flag_chars.has_char_p (bad_flag_pairs[i].flag_char1))
2482 continue;
2483 if (!flag_chars.has_char_p (bad_flag_pairs[i].flag_char2))
2484 continue;
2485 if (bad_flag_pairs[i].predicate != 0
2486 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
2487 continue;
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)
2491 {
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,
2496 fki->name);
2497 else
2498 warning_at (format_string_loc, OPT_Wformat_,
2499 "%s ignored with %s in %s format",
2500 _(s->name), _(t->name), fki->name);
2501 }
2502 else
2503 {
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,
2508 fki->name);
2509 else
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);
2513 }
2514 }
2515}
2516
2517/* Give Y2K warnings. */
2518
2519void
2520argument_parser::give_y2k_warnings (const format_char_info *fci,
2521 char format_char)
2522{
2523 if (!warn_format_y2k)
2524 return;
2525
2526 int y2k_level = 0;
2527 if (strchr (fci->flags2, '4') != 0)
2528 if (flag_chars.has_char_p ('E'))
2529 y2k_level = 3;
2530 else
2531 y2k_level = 2;
2532 else if (strchr (fci->flags2, '3') != 0)
2533 y2k_level = 3;
2534 else if (strchr (fci->flags2, '2') != 0)
2535 y2k_level = 2;
2536 if (y2k_level == 3)
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",
2543 format_char);
2544}
2545
2546/* Parse any "scan sets" enclosed in square brackets, e.g.
2547 for scanf-style calls. */
2548
2549void
2550argument_parser::parse_any_scan_set (const format_char_info *fci)
2551{
2552 if (strchr (fci->flags2, '[') == NULL)
2553 return;
2554
2555 /* Skip over scan set, in case it happens to have '%' in it. */
2556 if (*format_chars == '^')
2557 ++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 == ']')
2561 ++format_chars;
2562 while (*format_chars && *format_chars != ']')
2563 ++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,
2568 OPT_Wformat_,
2569 "no closing %<]%> for %<%%[%> format");
2570}
2571
2572/* Return true if this argument is to be continued to be parsed,
2573 false to skip to next argument. */
2574
2575bool
2576argument_parser::handle_conversions (const format_char_info *fci,
2577 const length_modifier &len_modifier,
2578 tree &wanted_type,
2579 const char *&wanted_type_name,
2580 unsigned HOST_WIDE_INT &arg_num,
2581 tree &params,
2582 char format_char)
2583{
2584 enum format_std_version wanted_type_std;
2585
2586 if (!(fki->flags & (int) FMT_FLAG_ARG_CONVERT))
2587 return true;
2588
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)
2594 {
2595 format_warning_at_char (format_string_loc, format_string_cst,
2596 format_chars - orig_format_chars,
2597 OPT_Wformat_,
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. */
2604 arg_num++;
2605 if (params != 0)
2606 params = TREE_CHAIN (params);
2607 return false;
2608 }
2609 else if (pedantic
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))
2615 {
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,
2619 OPT_Wformat_,
2620 "%s does not support the %<%%%s%c%> %s format",
2621 C_STD_NAME (wanted_type_std),
2622 len_modifier.chars,
2623 format_char, fki->name);
2624 }
2625
2626 return true;
2627}
2628
2629/* Check type of argument against desired type.
2630
2631 Return true if format parsing is to continue, false otherwise. */
2632
2633bool
2634argument_parser::
2635check_argument_type (const format_char_info *fci,
2636 const length_modifier &len_modifier,
2637 tree &wanted_type,
2638 const char *&wanted_type_name,
2639 const bool suppressed,
2640 unsigned HOST_WIDE_INT &arg_num,
2641 tree &params,
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)
2647{
2648 if (info->first_arg_num == 0)
2649 return true;
2650
2651 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2652 || suppressed)
2653 {
2654 if (main_arg_num != 0)
2655 {
2656 if (suppressed)
2657 warning_at (format_string_loc, OPT_Wformat_,
2658 "operand number specified with "
2659 "suppressed assignment");
2660 else
2661 warning_at (format_string_loc, OPT_Wformat_,
2662 "operand number specified for format "
2663 "taking no argument");
2664 }
2665 }
2666 else
2667 {
2668 format_wanted_type *wanted_type_ptr;
2669
2670 if (main_arg_num != 0)
2671 {
2672 arg_num = main_arg_num;
2673 params = main_arg_params;
2674 }
2675 else
2676 {
2677 ++arg_num;
2678 if (has_operand_number > 0)
2679 {
2680 warning_at (format_string_loc, OPT_Wformat_,
2681 "missing $ operand number in format");
2682 return false;
2683 }
2684 else
2685 has_operand_number = 0;
2686 }
2687
2688 wanted_type_ptr = &main_wanted_type;
2689 while (fci)
2690 {
2691 tree cur_param;
2692 if (params == 0)
2693 cur_param = NULL;
2694 else
2695 {
2696 cur_param = TREE_VALUE (params);
2697 params = TREE_CHAIN (params);
2698 }
2699
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;
2711 if (alloc_flag)
2712 wanted_type_ptr->writing_in_flag = 1;
2713 else
2714 {
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;
2719 }
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;
2732
2733 fci = fci->chain;
2734 if (fci)
2735 {
2736 wanted_type_ptr = fwt_pool.allocate ();
2737 arg_num++;
2738 wanted_type = *fci->types[len_modifier.val].type;
2739 wanted_type_name = fci->types[len_modifier.val].name;
2740 }
2741 }
2742 }
2743
2744 if (first_wanted_type != 0)
2745 {
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);
2756 }
2757
2758 return true;
2759}
2760
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. */
2767
2768static void
2769check_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)
2776{
2777 const char * const orig_format_chars = format_chars;
2778 const tree first_fillin_param = params;
2779
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;
2783
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;
2787
2788 /* Vector of pointers to opening quoting directives (like GCC "%<"). */
2789 auto_vec<const char*> quotdirs;
2790
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;
2797
2798 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
2799
2800 while (*format_chars != 0)
2801 {
2802 if (*format_chars++ != '%')
2803 continue;
2804 if (*format_chars == 0)
2805 {
2806 format_warning_at_char (format_string_loc, format_string_cst,
2807 format_chars - orig_format_chars,
2808 OPT_Wformat_,
2809 "spurious trailing %<%%%> in format");
2810 continue;
2811 }
2812 if (*format_chars == '%')
2813 {
2814 ++format_chars;
2815 continue;
2816 }
2817
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);
2823
2824 if (!arg_parser.read_any_dollar ())
2825 return;
2826
2827 if (!arg_parser.read_format_flags ())
2828 return;
2829
2830 /* Read any format width, possibly * or *m$. */
2831 if (!arg_parser.read_any_format_width (params, arg_num))
2832 return;
2833
2834 /* Read any format left precision (must be a number, not *). */
2835 arg_parser.read_any_format_left_precision ();
2836
2837 /* Read any format precision, possibly * or *m$. */
2838 if (!arg_parser.read_any_format_precision (params, arg_num))
2839 return;
2840
2841 const char *format_start = format_chars;
2842
2843 arg_parser.handle_alloc_chars ();
2844
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
2849 to here. */
2850 const char *type_start = format_chars;
2851
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 ();
2855
2856 /* Read any modifier (strftime E/O). */
2857 arg_parser.read_any_other_modifier ();
2858
2859 char format_char = *format_chars;
2860 if (format_char == 0
2861 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
2862 && format_char == '%'))
2863 {
2864 format_warning_at_char (format_string_loc, format_string_cst,
2865 format_chars - orig_format_chars,
2866 OPT_Wformat_,
2867 "conversion lacks type at end of format");
2868 continue;
2869 }
2870 format_chars++;
2871
2872 const format_char_info * const fci
2873 = arg_parser.find_format_char_info (format_char);
2874 if (!fci)
2875 continue;
2876
2877 flag_chars.validate (fki, fci, flag_specs, format_chars,
2878 format_string_cst,
2879 format_string_loc, orig_format_chars, format_char,
2880 quotdirs.length () > 0);
2881
2882 const int alloc_flag = flag_chars.get_alloc_flag (fki);
2883 const bool suppressed = flag_chars.assignment_suppression_p (fki);
2884
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, '>');
2889
2890 if (quot_begin_p && !quot_end_p)
2891 {
2892 if (quotdirs.length ())
2893 format_warning_at_char (format_string_loc, format_string_cst,
2894 format_chars - orig_format_chars,
2895 OPT_Wformat_,
2896 "nested quoting directive");
2897 quotdirs.safe_push (format_chars);
2898 }
2899 else if (!quot_begin_p && quot_end_p)
2900 {
2901 if (quotdirs.length ())
2902 quotdirs.pop ();
2903 else
2904 format_warning_at_char (format_string_loc, format_string_cst,
2905 format_chars - orig_format_chars,
2906 OPT_Wformat_,
2907 "unmatched quoting directive");
2908 }
2909
2910 bool color_begin_p = strchr (fci->flags2, '/');
2911 if (color_begin_p)
2912 {
2913 color_begin = format_chars;
2914 color_end = NULL;
2915 }
2916 else if (strchr (fci->flags2, '\\'))
2917 {
2918 if (color_end)
2919 format_warning_at_char (format_string_loc, format_string_cst,
2920 format_chars - orig_format_chars,
2921 OPT_Wformat_,
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,
2927 OPT_Wformat_,
2928 "unmatched color reset directive");
2929 color_end = format_chars;
2930 }
2931
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 ())
2935 {
2936 if (strchr (fci->flags2, '"'))
2937 format_warning_at_char (format_string_loc, format_string_cst,
2938 format_chars - orig_format_chars,
2939 OPT_Wformat_,
2940 "%qc conversion used within a quoted "
2941 "sequence",
2942 format_char);
2943 }
2944
2945 /* Validate the pairs of flags used. */
2946 arg_parser.validate_flag_pairs (fci, format_char);
2947
2948 arg_parser.give_y2k_warnings (fci, format_char);
2949
2950 arg_parser.parse_any_scan_set (fci);
2951
2952 tree wanted_type = NULL;
2953 const char *wanted_type_name = NULL;
2954
2955 if (!arg_parser.handle_conversions (fci, len_modifier,
2956 wanted_type, wanted_type_name,
2957 arg_num,
2958 params,
2959 format_char))
2960 continue;
2961
2962 arg_parser.main_wanted_type.next = NULL;
2963
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,
2967 suppressed,
2968 arg_num, params,
2969 alloc_flag,
2970 format_start, type_start,
2971 fmt_param_loc,
2972 format_char))
2973 return;
2974 }
2975
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)
2983 {
2984 res->number_other--;
2985 res->number_extra_args++;
2986 }
2987 if (has_operand_number > 0)
2988 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
2989
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");
2998}
2999
3000/* Check the argument types from a single format conversion (possibly
3001 including width and precision arguments).
3002
3003 FMT_LOC is the location of the format conversion.
3004
3005 TYPES is a singly-linked list expressing the parts of the format
3006 conversion that expect argument types, and the arguments they
3007 correspond to.
3008
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).
3012
3013 CONVERSION_CHAR is the user-provided conversion specifier.
3014
3015 For example, given:
3016
3017 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3018
3019 then FMT_LOC covers this range:
3020
3021 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3022 ^^^^^^^^^
3023
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);
3027 ^ ^^^^
3028 against arg3, and
3029 (2) the check for the field precision here:
3030 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3031 ^^ ^^^^
3032 against arg4, and
3033 (3) the check for the length modifier and conversion char here:
3034 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3035 ^^^ ^^^^
3036 against arg5.
3037
3038 OFFSET_TO_TYPE_START is 13, the offset to the "lld" within the
3039 STRING_CST:
3040
3041 0000000000111111111122
3042 0123456789012345678901
3043 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5);
3044 ^ ^
3045 | ` CONVERSION_CHAR: 'd'
3046 type starts here. */
3047
3048static void
3049check_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)
3054{
3055 for (; types != 0; types = types->next)
3056 {
3057 tree cur_param;
3058 tree cur_type;
3059 tree orig_cur_type;
3060 tree wanted_type;
3061 int arg_num;
3062 int i;
3063 int char_type_flag;
3064
3065 wanted_type = types->wanted_type;
3066 arg_num = types->arg_num;
3067
3068 /* The following should not occur here. */
3069 gcc_assert (wanted_type);
3070 gcc_assert (wanted_type != void_type_node || types->pointer_count);
3071
3072 if (types->pointer_count == 0)
3073 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
3074
3075 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
3076
3077 cur_param = types->param;
3078 if (!cur_param)
3079 {
3080 format_type_warning (fmt_loc, UNKNOWN_LOCATION, types, wanted_type,
3081 NULL, fki, offset_to_type_start,
3082 conversion_char);
3083 continue;
3084 }
3085
3086 cur_type = TREE_TYPE (cur_param);
3087 if (cur_type == error_mark_node)
3088 continue;
3089 orig_cur_type = cur_type;
3090 char_type_flag = 0;
3091
3092 location_t param_loc = UNKNOWN_LOCATION;
3093 if (EXPR_HAS_LOCATION (cur_param))
3094 param_loc = EXPR_LOCATION (cur_param);
3095 else if (arglocs)
3096 {
3097 /* arg_num is 1-based. */
3098 gcc_assert (types->arg_num > 0);
3099 param_loc = (*arglocs)[types->arg_num - 1];
3100 }
3101
3102 STRIP_NOPS (cur_param);
3103
3104 /* Check the types of any additional pointer arguments
3105 that precede the "real" argument. */
3106 for (i = 0; i < types->pointer_count; ++i)
3107 {
3108 if (TREE_CODE (cur_type) == POINTER_TYPE)
3109 {
3110 cur_type = TREE_TYPE (cur_type);
3111 if (cur_type == error_mark_node)
3112 break;
3113
3114 /* Check for writing through a NULL pointer. */
3115 if (types->writing_in_flag
3116 && i == 0
3117 && cur_param != 0
3118 && integer_zerop (cur_param))
3119 warning (OPT_Wformat_, "writing through null pointer "
3120 "(argument %d)", arg_num);
3121
3122 /* Check for reading through a NULL pointer. */
3123 if (types->reading_from_flag
3124 && i == 0
3125 && cur_param != 0
3126 && integer_zerop (cur_param))
3127 warning (OPT_Wformat_, "reading through null pointer "
3128 "(argument %d)", arg_num);
3129
3130 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
3131 cur_param = TREE_OPERAND (cur_param, 0);
3132 else
3133 cur_param = 0;
3134
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
3141 && i == 0
3142 && (TYPE_READONLY (cur_type)
3143 || (cur_param != 0
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);
3149
3150 /* If there are extra type qualifiers beyond the first
3151 indirection, then this makes the types technically
3152 incompatible. */
3153 if (i > 0
3154 && pedantic
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)",
3161 arg_num);
3162
3163 }
3164 else
3165 {
3166 format_type_warning (fmt_loc, param_loc,
3167 types, wanted_type, orig_cur_type, fki,
3168 offset_to_type_start, conversion_char);
3169 break;
3170 }
3171 }
3172
3173 if (i < types->pointer_count)
3174 continue;
3175
3176 cur_type = TYPE_MAIN_VARIANT (cur_type);
3177
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);
3184
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))
3187 continue;
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
3191 types. */
3192 if (wanted_type == void_type_node
3193 && (!pedantic || (i == 1 && char_type_flag)))
3194 continue;
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)))
3207 continue;
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)
3217 {
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))
3221 continue;
3222 }
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)
3227 && char_type_flag)
3228 continue;
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))
3234 continue;
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);
3239 }
3240}
3241
3242/* Given type TYPE, attempt to dereference the type N times
3243 (e.g. from ("int ***", 2) to "int *")
3244
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). */
3248
3249static tree
3250deref_n_times (tree type, int n)
3251{
3252 gcc_assert (type);
3253
3254 for (int i = n; i > 0; i--)
3255 {
3256 if (TREE_CODE (type) != POINTER_TYPE)
3257 return NULL_TREE;
3258 type = TREE_TYPE (type);
3259 }
3260 /* Strip off any "const" etc. */
3261 return build_qualified_type (type, 0);
3262}
3263
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. */
3267
3268static const char *
3269get_modifier_for_format_len (const format_length_info *fli,
3270 enum format_lengths format_len)
3271{
3272 for (; fli->name; fli++)
3273 {
3274 if (fli->index == format_len)
3275 return fli->name;
3276 if (fli->double_index == format_len)
3277 return fli->double_name;
3278 }
3279 return NULL;
3280}
3281
3282#if CHECKING_P
3283
3284namespace selftest {
3285
3286static void
3287test_get_modifier_for_format_len ()
3288{
3289 ASSERT_STREQ ("h",
3290 get_modifier_for_format_len (printf_length_specs, FMT_LEN_h));
3291 ASSERT_STREQ ("hh",
3292 get_modifier_for_format_len (printf_length_specs, FMT_LEN_hh));
3293 ASSERT_STREQ ("L",
3294 get_modifier_for_format_len (printf_length_specs, FMT_LEN_L));
3295 ASSERT_EQ (NULL,
3296 get_modifier_for_format_len (printf_length_specs, FMT_LEN_none));
3297}
3298
3299} // namespace selftest
3300
3301#endif /* CHECKING_P */
3302
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. */
3306
3307static bool
3308matching_type_p (tree spec_type, tree arg_type)
3309{
3310 gcc_assert (spec_type);
3311 gcc_assert (arg_type);
3312
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))
3317 return false;
3318
3319 spec_type = TYPE_CANONICAL (spec_type);
3320 arg_type = TYPE_CANONICAL (arg_type);
3321
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)))
3327 return true;
3328
3329 return spec_type == arg_type;
3330}
3331
3332/* Subroutine of get_format_for_type.
3333
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).
3337
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.
3342
3343 If successful, returns a non-NULL string which should be freed
3344 by the caller.
3345 Otherwise, returns NULL. */
3346
3347static char *
3348get_format_for_type_1 (const format_kind_info *fki, tree arg_type,
3349 char conversion_char)
3350{
3351 gcc_assert (arg_type);
3352
3353 const format_char_info *spec;
3354 for (spec = &fki->conversion_specs[0];
3355 spec->format_chars;
3356 spec++)
3357 {
3358 if (conversion_char)
3359 if (!strchr (spec->format_chars, conversion_char))
3360 continue;
3361
3362 tree effective_arg_type = deref_n_times (arg_type,
3363 spec->pointer_count);
3364 if (!effective_arg_type)
3365 continue;
3366 for (int i = 0; i < FMT_LEN_MAX; i++)
3367 {
3368 const format_type_detail *ftd = &spec->types[i];
3369 if (!ftd->type)
3370 continue;
3371 if (matching_type_p (*ftd->type, effective_arg_type))
3372 {
3373 const char *len_modifier
3374 = get_modifier_for_format_len (fki->length_char_specs,
3375 (enum format_lengths)i);
3376 if (!len_modifier)
3377 len_modifier = "";
3378
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);
3385 else
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]);
3391 }
3392 }
3393 }
3394
3395 return NULL;
3396}
3397
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).
3401
3402 If successful, returns a non-NULL string which should be freed
3403 by the caller.
3404 Otherwise, returns NULL. */
3405
3406static char *
3407get_format_for_type (const format_kind_info *fki, tree arg_type,
3408 char conversion_char)
3409{
3410 gcc_assert (arg_type);
3411 gcc_assert (conversion_char);
3412
3413 /* First pass: look for a format_char_info containing CONVERSION_CHAR
3414 If we find one, then presumably the length modifier was incorrect
3415 (or absent). */
3416 char *result = get_format_for_type_1 (fki, arg_type, conversion_char);
3417 if (result)
3418 return result;
3419
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');
3423}
3424
3425/* Attempt to get a string for use as a replacement fix-it hint for the
3426 source range in FMT_LOC.
3427
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.
3432
3433 For example, given a long vs long long mismatch for arg5 here:
3434
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);
3441 ^ ^
3442 | ` CONVERSION_CHAR: 'd'
3443 type starts here
3444
3445 where OFFSET_TO_TYPE_START is 13 (the offset to the "lld" within the
3446 STRING_CST), where the user provided:
3447 %-+*.*lld
3448 the result (assuming "long" argument 5) should be:
3449 %-+*.*ld
3450
3451 If successful, returns a non-NULL string which should be freed
3452 by the caller.
3453 Otherwise, returns NULL. */
3454
3455static char *
3456get_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)
3460{
3461 /* Attempt to provide hints for argument types, but not for field widths
3462 and precisions. */
3463 if (!arg_type)
3464 return NULL;
3465 if (type->kind != CF_KIND_FORMAT)
3466 return NULL;
3467
3468 /* Locate the current code within the source range, rejecting
3469 any awkward cases where the format string occupies more than
3470 one line.
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);
3475
3476 location_t fmt_substring_loc;
3477 const char *err = type_loc.get_location (&fmt_substring_loc);
3478 if (err)
3479 return NULL;
3480
3481 source_range fmt_substring_range
3482 = get_range_from_loc (line_table, fmt_substring_loc);
3483
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)
3491 return NULL;
3492 if (start.file != finish.file)
3493 return NULL;
3494 if (caret.line != start.line)
3495 return NULL;
3496 if (start.line != finish.line)
3497 return NULL;
3498 if (start.column > caret.column)
3499 return NULL;
3500 if (start.column > finish.column)
3501 return NULL;
3502 if (caret.column > finish.column)
3503 return NULL;
3504
3505 int line_width;
3506 const char *line = location_get_source_line (start.file, start.line,
3507 &line_width);
3508 if (line == NULL)
3509 return NULL;
3510
3511 /* If we got this far, then we have the line containing the
3512 existing conversion specification.
3513
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);
3520
3521 /* Now attempt to generate a suggestion for the rest of the specification
3522 (length modifier and conversion char), based on ARG_TYPE and
3523 CONVERSION_CHAR.
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)
3527 {
3528 free (prefix);
3529 return NULL;
3530 }
3531
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);
3537 free (prefix);
3538 return result;
3539}
3540
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.
3552
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.
3557
3558 For example, given a type mismatch for argument 5 here:
3559
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);
3566 ^ ^ ^~~~~~~~~
3567 | ` CONVERSION_CHAR: 'd' PARAM_LOC
3568 type starts here
3569
3570 OFFSET_TO_TYPE_START is 13, the offset to the "lld" within the
3571 STRING_CST. */
3572
3573static void
3574format_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)
3581{
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;
3588
3589 char *p;
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
3594 && arg_type
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)
3608 p[0] = 0;
3609 else if (c_dialect_cxx ())
3610 {
3611 memset (p, '*', pointer_count);
3612 p[pointer_count] = 0;
3613 }
3614 else
3615 {
3616 p[0] = ' ';
3617 memset (p + 1, '*', pointer_count);
3618 p[pointer_count + 1] = 0;
3619 }
3620
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);
3626
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);
3632
3633 if (wanted_type_name)
3634 {
3635 if (arg_type)
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);
3645 else
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);
3653 }
3654 else
3655 {
3656 if (arg_type)
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);
3666 else
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);
3674 }
3675
3676 free (corrected_substring);
3677}
3678
3679
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. */
3683static unsigned int
3684find_char_info_specifier_index (const format_char_info *fci, int c)
3685{
3686 unsigned i;
3687
3688 for (i = 0; fci->format_chars; i++, fci++)
3689 if (strchr (fci->format_chars, c))
3690 return i;
3691
3692 /* We shouldn't be looking for a non-existent specifier. */
3693 gcc_unreachable ();
3694}
3695
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. */
3699static unsigned int
3700find_length_info_modifier_index (const format_length_info *fli, int c)
3701{
3702 unsigned i;
3703
3704 for (i = 0; fli->name; i++, fli++)
3705 if (strchr (fli->name, c))
3706 return i;
3707
3708 /* We shouldn't be looking for a non-existent modifier. */
3709 gcc_unreachable ();
3710}
3711
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. */
3715static void
3716init_dynamic_asm_fprintf_info (void)
3717{
3718 static tree hwi;
3719
3720 if (!hwi)
3721 {
3722 format_length_info *new_asm_fprintf_length_specs;
3723