GCC47: Add local modifications
[dragonfly.git] / contrib / gcc-4.7 / gcc / c-family / c-format.c
CommitLineData
e4b17023
JM
1/* Check calls to formatted I/O functions (-Wformat).
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify it under
9the terms of the GNU General Public License as published by the Free
10Software Foundation; either version 3, or (at your option) any later
11version.
12
13GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14WARRANTY; without even the implied warranty of MERCHANTABILITY or
15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16for more details.
17
18You should have received a copy of the GNU General Public License
19along with GCC; see the file COPYING3. If not see
20<http://www.gnu.org/licenses/>. */
21
22#include "config.h"
23#include "system.h"
24#include "coretypes.h"
25#include "tm.h"
26#include "tree.h"
27#include "flags.h"
28#include "c-common.h"
29#include "c-objc.h"
30#include "intl.h"
31#include "diagnostic-core.h"
32#include "langhooks.h"
33#include "c-format.h"
34#include "alloc-pool.h"
35#include "c-target.h"
36\f
37/* Set format warning options according to a -Wformat=n option. */
38
39void
40set_Wformat (int setting)
41{
42 warn_format = setting;
43 warn_format_extra_args = setting;
44 warn_format_zero_length = setting;
45 warn_format_contains_nul = setting;
46 if (setting != 1)
47 {
48 warn_format_nonliteral = setting;
49 warn_format_security = setting;
50 warn_format_y2k = setting;
51 }
52 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */
53 if (setting)
54 warn_nonnull = setting;
55}
56
57\f
58/* Handle attributes associated with format checking. */
59
60/* This must be in the same order as format_types, except for
61 format_type_error. Target-specific format types do not have
62 matching enum values. */
63enum format_type { printf_format_type, asm_fprintf_format_type,
64 gcc_diag_format_type, gcc_tdiag_format_type,
65 gcc_cdiag_format_type,
66 gcc_cxxdiag_format_type, gcc_gfc_format_type,
67 gcc_objc_string_format_type,
68 format_type_error = -1};
69
70typedef struct function_format_info
71{
72 int format_type; /* type of format (printf, scanf, etc.) */
73 unsigned HOST_WIDE_INT format_num; /* number of format argument */
74 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */
75} function_format_info;
76
77static bool decode_format_attr (tree, function_format_info *, int);
78static int decode_format_type (const char *);
79
80static bool check_format_string (tree argument,
81 unsigned HOST_WIDE_INT format_num,
82 int flags, bool *no_add_attrs,
83 int expected_format_type);
84static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value,
85 int validated_p);
86static const char *convert_format_name_to_system_name (const char *attr_name);
87static bool cmp_attribs (const char *tattr_name, const char *attr_name);
88
89static int first_target_format_type;
90static const char *format_name (int format_num);
91static int format_flags (int format_num);
92
93/* Check that we have a pointer to a string suitable for use as a format.
94 The default is to check for a char type.
95 For objective-c dialects, this is extended to include references to string
96 objects validated by objc_string_ref_type_p ().
97 Targets may also provide a string object type that can be used within c and
98 c++ and shared with their respective objective-c dialects. In this case the
99 reference to a format string is checked for validity via a hook.
100
101 The function returns true if strref points to any string type valid for the
102 language dialect and target. */
103
104static bool
105valid_stringptr_type_p (tree strref)
106{
107 return (strref != NULL
108 && TREE_CODE (strref) == POINTER_TYPE
109 && (TYPE_MAIN_VARIANT (TREE_TYPE (strref)) == char_type_node
110 || objc_string_ref_type_p (strref)
111 || (*targetcm.string_object_ref_type_p) ((const_tree) strref)));
112}
113
114/* Handle a "format_arg" attribute; arguments as in
115 struct attribute_spec.handler. */
116tree
117handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name),
118 tree args, int flags, bool *no_add_attrs)
119{
120 tree type = *node;
121 tree format_num_expr = TREE_VALUE (args);
122 unsigned HOST_WIDE_INT format_num = 0;
123
124 if (!get_constant (format_num_expr, &format_num, 0))
125 {
126 error ("format string has invalid operand number");
127 *no_add_attrs = true;
128 return NULL_TREE;
129 }
130
131 if (prototype_p (type))
132 {
133 /* The format arg can be any string reference valid for the language and
134 target. We cannot be more specific in this case. */
135 if (!check_format_string (type, format_num, flags, no_add_attrs, -1))
136 return NULL_TREE;
137 }
138
139 if (!valid_stringptr_type_p (TREE_TYPE (type)))
140 {
141 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
142 error ("function does not return string type");
143 *no_add_attrs = true;
144 return NULL_TREE;
145 }
146
147 return NULL_TREE;
148}
149
150/* Verify that the format_num argument is actually a string reference suitable,
151 for the language dialect and target (in case the format attribute is in
152 error). When we know the specific reference type expected, this is also
153 checked. */
154static bool
155check_format_string (tree fntype, unsigned HOST_WIDE_INT format_num,
156 int flags, bool *no_add_attrs, int expected_format_type)
157{
158 unsigned HOST_WIDE_INT i;
159 bool is_objc_sref, is_target_sref, is_char_ref;
160 tree ref;
161 int fmt_flags;
162 function_args_iterator iter;
163
164 i = 1;
165 FOREACH_FUNCTION_ARGS (fntype, ref, iter)
166 {
167 if (i == format_num)
168 break;
169 i++;
170 }
171
172 if (!ref
173 || !valid_stringptr_type_p (ref))
174 {
175 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
176 error ("format string argument is not a string type");
177 *no_add_attrs = true;
178 return false;
179 }
180
181 /* We only know that we want a suitable string reference. */
182 if (expected_format_type < 0)
183 return true;
184
185 /* Now check that the arg matches the expected type. */
186 is_char_ref =
187 (TYPE_MAIN_VARIANT (TREE_TYPE (ref)) == char_type_node);
188
189 fmt_flags = format_flags (expected_format_type);
190 is_objc_sref = is_target_sref = false;
191 if (!is_char_ref)
192 is_objc_sref = objc_string_ref_type_p (ref);
193
194 if (!(fmt_flags & FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL))
195 {
196 if (is_char_ref)
197 return true; /* OK, we expected a char and found one. */
198 else
199 {
200 /* We expected a char but found an extended string type. */
201 if (is_objc_sref)
202 error ("found a %<%s%> reference but the format argument should"
203 " be a string", format_name (gcc_objc_string_format_type));
204 else
205 error ("found a %qT but the format argument should be a string",
206 ref);
207 *no_add_attrs = true;
208 return false;
209 }
210 }
211
212 /* We expect a string object type as the format arg. */
213 if (is_char_ref)
214 {
215 error ("format argument should be a %<%s%> reference but"
216 " a string was found", format_name (expected_format_type));
217 *no_add_attrs = true;
218 return false;
219 }
220
221 /* We will assert that objective-c will support either its own string type
222 or the target-supplied variant. */
223 if (!is_objc_sref)
224 is_target_sref = (*targetcm.string_object_ref_type_p) ((const_tree) ref);
225
226 if (expected_format_type == (int) gcc_objc_string_format_type
227 && (is_objc_sref || is_target_sref))
228 return true;
229
230 /* We will allow a target string ref to match only itself. */
231 if (first_target_format_type
232 && expected_format_type >= first_target_format_type
233 && is_target_sref)
234 return true;
235 else
236 {
237 error ("format argument should be a %<%s%> reference",
238 format_name (expected_format_type));
239 *no_add_attrs = true;
240 return false;
241 }
242
243 gcc_unreachable ();
244}
245
246/* Verify EXPR is a constant, and store its value.
247 If validated_p is true there should be no errors.
248 Returns true on success, false otherwise. */
249static bool
250get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p)
251{
252 if (TREE_CODE (expr) != INTEGER_CST || TREE_INT_CST_HIGH (expr) != 0)
253 {
254 gcc_assert (!validated_p);
255 return false;
256 }
257
258 *value = TREE_INT_CST_LOW (expr);
259
260 return true;
261}
262
263/* Decode the arguments to a "format" attribute into a
264 function_format_info structure. It is already known that the list
265 is of the right length. If VALIDATED_P is true, then these
266 attributes have already been validated and must not be erroneous;
267 if false, it will give an error message. Returns true if the
268 attributes are successfully decoded, false otherwise. */
269
270static bool
271decode_format_attr (tree args, function_format_info *info, int validated_p)
272{
273 tree format_type_id = TREE_VALUE (args);
274 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
275 tree first_arg_num_expr
276 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
277
278 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
279 {
280 gcc_assert (!validated_p);
281 error ("unrecognized format specifier");
282 return false;
283 }
284 else
285 {
286 const char *p = IDENTIFIER_POINTER (format_type_id);
287
288 p = convert_format_name_to_system_name (p);
289
290 info->format_type = decode_format_type (p);
291
292 if (!c_dialect_objc ()
293 && info->format_type == gcc_objc_string_format_type)
294 {
295 gcc_assert (!validated_p);
296 warning (OPT_Wformat, "%qE is only allowed in Objective-C dialects",
297 format_type_id);
298 info->format_type = format_type_error;
299 return false;
300 }
301
302 if (info->format_type == format_type_error)
303 {
304 gcc_assert (!validated_p);
305 warning (OPT_Wformat, "%qE is an unrecognized format function type",
306 format_type_id);
307 return false;
308 }
309 }
310
311 if (!get_constant (format_num_expr, &info->format_num, validated_p))
312 {
313 error ("format string has invalid operand number");
314 return false;
315 }
316
317 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p))
318 {
319 error ("%<...%> has invalid operand number");
320 return false;
321 }
322
323 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num)
324 {
325 gcc_assert (!validated_p);
326 error ("format string argument follows the args to be formatted");
327 return false;
328 }
329
330 return true;
331}
332\f
333/* Check a call to a format function against a parameter list. */
334
335/* The C standard version C++ is treated as equivalent to
336 or inheriting from, for the purpose of format features supported. */
337#define CPLUSPLUS_STD_VER STD_C94
338/* The C standard version we are checking formats against when pedantic. */
339#define C_STD_VER ((int) (c_dialect_cxx () \
340 ? CPLUSPLUS_STD_VER \
341 : (flag_isoc99 \
342 ? STD_C99 \
343 : (flag_isoc94 ? STD_C94 : STD_C89))))
344/* The name to give to the standard version we are warning about when
345 pedantic. FEATURE_VER is the version in which the feature warned out
346 appeared, which is higher than C_STD_VER. */
347#define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
348 ? "ISO C++" \
349 : ((FEATURE_VER) == STD_EXT \
350 ? "ISO C" \
351 : "ISO C90"))
352/* Adjust a C standard version, which may be STD_C9L, to account for
353 -Wno-long-long. Returns other standard versions unchanged. */
354#define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
355 ? (warn_long_long ? STD_C99 : STD_C89) \
356 : (VER)))
357
358/* Enum describing the kind of specifiers present in the format and
359 requiring an argument. */
360enum format_specifier_kind {
361 CF_KIND_FORMAT,
362 CF_KIND_FIELD_WIDTH,
363 CF_KIND_FIELD_PRECISION
364};
365
366static const char *kind_descriptions[] = {
367 N_("format"),
368 N_("field width specifier"),
369 N_("field precision specifier")
370};
371
372/* Structure describing details of a type expected in format checking,
373 and the type to check against it. */
374typedef struct format_wanted_type
375{
376 /* The type wanted. */
377 tree wanted_type;
378 /* The name of this type to use in diagnostics. */
379 const char *wanted_type_name;
380 /* Should be type checked just for scalar width identity. */
381 int scalar_identity_flag;
382 /* The level of indirection through pointers at which this type occurs. */
383 int pointer_count;
384 /* Whether, when pointer_count is 1, to allow any character type when
385 pedantic, rather than just the character or void type specified. */
386 int char_lenient_flag;
387 /* Whether the argument, dereferenced once, is written into and so the
388 argument must not be a pointer to a const-qualified type. */
389 int writing_in_flag;
390 /* Whether the argument, dereferenced once, is read from and so
391 must not be a NULL pointer. */
392 int reading_from_flag;
393 /* The kind of specifier that this type is used for. */
394 enum format_specifier_kind kind;
395 /* The starting character of the specifier. This never includes the
396 initial percent sign. */
397 const char *format_start;
398 /* The length of the specifier. */
399 int format_length;
400 /* The actual parameter to check against the wanted type. */
401 tree param;
402 /* The argument number of that parameter. */
403 int arg_num;
404 /* The next type to check for this format conversion, or NULL if none. */
405 struct format_wanted_type *next;
406} format_wanted_type;
407
408/* Convenience macro for format_length_info meaning unused. */
409#define NO_FMT NULL, FMT_LEN_none, STD_C89
410
411static const format_length_info printf_length_specs[] =
412{
413 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 },
414 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 },
415 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 },
416 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
417 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 },
418 { "Z", FMT_LEN_z, STD_EXT, NO_FMT, 0 },
419 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 },
420 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 },
421 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 },
422 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 },
423 { NO_FMT, NO_FMT, 0 }
424};
425
426/* Length specifiers valid for asm_fprintf. */
427static const format_length_info asm_fprintf_length_specs[] =
428{
429 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
430 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
431 { NO_FMT, NO_FMT, 0 }
432};
433
434/* Length specifiers valid for GCC diagnostics. */
435static const format_length_info gcc_diag_length_specs[] =
436{
437 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 },
438 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 },
439 { NO_FMT, NO_FMT, 0 }
440};
441
442/* The custom diagnostics all accept the same length specifiers. */
443#define gcc_tdiag_length_specs gcc_diag_length_specs
444#define gcc_cdiag_length_specs gcc_diag_length_specs
445#define gcc_cxxdiag_length_specs gcc_diag_length_specs
446
447/* This differs from printf_length_specs only in that "Z" is not accepted. */
448static const format_length_info scanf_length_specs[] =
449{
450 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 },
451 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 },
452 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 },
453 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
454 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 },
455 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 },
456 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 },
457 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 },
458 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 },
459 { NO_FMT, NO_FMT, 0 }
460};
461
462
463/* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
464 make no sense for a format type not part of any C standard version. */
465static const format_length_info strfmon_length_specs[] =
466{
467 /* A GNU extension. */
468 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 },
469 { NO_FMT, NO_FMT, 0 }
470};
471
472
473/* For now, the Fortran front-end routines only use l as length modifier. */
474static const format_length_info gcc_gfc_length_specs[] =
475{
476 { "l", FMT_LEN_l, STD_C89, NO_FMT, 0 },
477 { NO_FMT, NO_FMT, 0 }
478};
479
480
481static const format_flag_spec printf_flag_specs[] =
482{
483 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
484 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
485 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
486 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
487 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
488 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT },
489 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT },
490 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
491 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
492 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
493 { 0, 0, 0, NULL, NULL, STD_C89 }
494};
495
496
497static const format_flag_pair printf_flag_pairs[] =
498{
499 { ' ', '+', 1, 0 },
500 { '0', '-', 1, 0 },
501 { '0', 'p', 1, 'i' },
502 { 0, 0, 0, 0 }
503};
504
505static const format_flag_spec asm_fprintf_flag_specs[] =
506{
507 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 },
508 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
509 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
510 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 },
511 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 },
512 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 },
513 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
514 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
515 { 0, 0, 0, NULL, NULL, STD_C89 }
516};
517
518static const format_flag_pair asm_fprintf_flag_pairs[] =
519{
520 { ' ', '+', 1, 0 },
521 { '0', '-', 1, 0 },
522 { '0', 'p', 1, 'i' },
523 { 0, 0, 0, 0 }
524};
525
526static const format_flag_pair gcc_diag_flag_pairs[] =
527{
528 { 0, 0, 0, 0 }
529};
530
531#define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
532#define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
533#define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
534
535static const format_flag_pair gcc_gfc_flag_pairs[] =
536{
537 { 0, 0, 0, 0 }
538};
539
540static const format_flag_spec gcc_diag_flag_specs[] =
541{
542 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 },
543 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 },
544 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 },
545 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 },
546 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
547 { 0, 0, 0, NULL, NULL, STD_C89 }
548};
549
550#define gcc_tdiag_flag_specs gcc_diag_flag_specs
551#define gcc_cdiag_flag_specs gcc_diag_flag_specs
552#define gcc_cxxdiag_flag_specs gcc_diag_flag_specs
553
554static const format_flag_spec scanf_flag_specs[] =
555{
556 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 },
557 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT },
558 { 'm', 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT },
559 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
560 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
561 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT },
562 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT },
563 { 0, 0, 0, NULL, NULL, STD_C89 }
564};
565
566
567static const format_flag_pair scanf_flag_pairs[] =
568{
569 { '*', 'L', 0, 0 },
570 { 'a', 'm', 0, 0 },
571 { 0, 0, 0, 0 }
572};
573
574
575static const format_flag_spec strftime_flag_specs[] =
576{
577 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT },
578 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT },
579 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT },
580 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT },
581 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT },
582 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
583 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 },
584 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 },
585 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT },
586 { 0, 0, 0, NULL, NULL, STD_C89 }
587};
588
589
590static const format_flag_pair strftime_flag_pairs[] =
591{
592 { 'E', 'O', 0, 0 },
593 { '_', '-', 0, 0 },
594 { '_', '0', 0, 0 },
595 { '-', '0', 0, 0 },
596 { '^', '#', 0, 0 },
597 { 0, 0, 0, 0 }
598};
599
600
601static const format_flag_spec strfmon_flag_specs[] =
602{
603 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 },
604 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 },
605 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 },
606 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 },
607 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 },
608 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 },
609 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 },
610 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 },
611 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 },
612 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 },
613 { 0, 0, 0, NULL, NULL, STD_C89 }
614};
615
616static const format_flag_pair strfmon_flag_pairs[] =
617{
618 { '+', '(', 0, 0 },
619 { 0, 0, 0, 0 }
620};
621
622
fdc4107c
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623static const format_char_info dfly_ext_char_info =
624{ NULL, 1, STD_EXT, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL };
625
e4b17023
JM
626static const format_char_info print_char_table[] =
627{
628 /* C89 conversion specifiers. */
629 { "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 },
630 { "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 },
631 { "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 },
632 { "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 },
633 { "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 },
634 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
635 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL },
636 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL },
637 { "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 },
638 /* C99 conversion specifiers. */
639 { "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 },
640 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL },
641 /* X/Open conversion specifiers. */
642 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL },
643 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL },
644 /* GNU conversion specifiers. */
645 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL },
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JM
646 /* BSD conversion specifiers. */
647 /* DragonFly kernel extensions (src/sys/kern/subr_prf.c).
648 The format %b is supported to decode error registers.
649 Its usage is: printf("reg=%b\n", regval, "<base><arg>*");
650 which produces: reg=3<BITTWO,BITONE>
651 The format %D provides a hexdump given a pointer and separator string:
652 ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
653 ("%*D", len, ptr, " ") -> XX XX XX XX ...
654 */
655 { "D", 1, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", &dfly_ext_char_info },
656 { "b", 0, STD_EXT, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", &dfly_ext_char_info },
657 { "ry", 0, STD_EXT, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "i", NULL },
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JM
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 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL },
678 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
679};
680
681static const format_char_info gcc_diag_char_table[] =
682{
683 /* C89 conversion specifiers. */
684 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
685 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
686 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
687 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
688 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
689 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
690
691 /* Custom conversion specifiers. */
692
693 /* These will require a "tree" at runtime. */
694 { "K", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
695
696 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
697 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
698 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
699};
700
701static const format_char_info gcc_tdiag_char_table[] =
702{
703 /* C89 conversion specifiers. */
704 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
705 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
706 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
707 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
708 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
709 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
710
711 /* Custom conversion specifiers. */
712
713 /* These will require a "tree" at runtime. */
714 { "DFKTEV", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
715
716 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
717
718 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
719 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
720 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
721};
722
723static const format_char_info gcc_cdiag_char_table[] =
724{
725 /* C89 conversion specifiers. */
726 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
727 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
728 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
729 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
730 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
731 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
732
733 /* Custom conversion specifiers. */
734
735 /* These will require a "tree" at runtime. */
736 { "DEFKTV", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL },
737
738 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
739
740 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
741 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
742 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
743};
744
745static const format_char_info gcc_cxxdiag_char_table[] =
746{
747 /* C89 conversion specifiers. */
748 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
749 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
750 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
751 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
752 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL },
753 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL },
754
755 /* Custom conversion specifiers. */
756
757 /* These will require a "tree" at runtime. */
758 { "ADEFKSTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL },
759
760 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL },
761
762 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
763 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL },
764
765 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL },
766 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL },
767 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
768};
769
770static const format_char_info gcc_gfc_char_table[] =
771{
772 /* C89 conversion specifiers. */
773 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
774 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
775 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL },
776 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL },
777
778 /* gfc conversion specifiers. */
779
780 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL },
781
782 /* This will require a "locus" at runtime. */
783 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL },
784
785 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
786};
787
788static const format_char_info scan_char_table[] =
789{
790 /* C89 conversion specifiers. */
791 { "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 },
792 { "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 },
793 { "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 },
794 { "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 },
795 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL },
796 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL },
797 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL },
798 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL },
799 { "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 },
800 /* C99 conversion specifiers. */
801 { "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 },
802 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL },
803 /* X/Open conversion specifiers. */
804 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL },
805 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL },
806 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
807};
808
809static const format_char_info time_char_table[] =
810{
811 /* C89 conversion specifiers. */
812 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL },
813 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL },
814 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL },
815 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL },
816 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL },
817 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL },
818 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL },
819 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL },
820 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL },
821 /* C99 conversion specifiers. */
822 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL },
823 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL },
824 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL },
825 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL },
826 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL },
827 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL },
828 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL },
829 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL },
830 /* GNU conversion specifiers. */
831 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL },
832 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL },
833 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
834};
835
836static const format_char_info monetary_char_table[] =
837{
838 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL },
839 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL }
840};
841
842/* This must be in the same order as enum format_type. */
843static const format_kind_info format_types_orig[] =
844{
845 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
846 printf_flag_specs, printf_flag_pairs,
847 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK,
848 'w', 0, 'p', 0, 'L', 0,
849 &integer_type_node, &integer_type_node
850 },
851 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL,
852 asm_fprintf_flag_specs, asm_fprintf_flag_pairs,
853 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK,
854 'w', 0, 'p', 0, 'L', 0,
855 NULL, NULL
856 },
857 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+#", NULL,
858 gcc_diag_flag_specs, gcc_diag_flag_pairs,
859 FMT_FLAG_ARG_CONVERT,
860 0, 0, 'p', 0, 'L', 0,
861 NULL, &integer_type_node
862 },
863 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+#", NULL,
864 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs,
865 FMT_FLAG_ARG_CONVERT,
866 0, 0, 'p', 0, 'L', 0,
867 NULL, &integer_type_node
868 },
869 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+#", NULL,
870 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs,
871 FMT_FLAG_ARG_CONVERT,
872 0, 0, 'p', 0, 'L', 0,
873 NULL, &integer_type_node
874 },
875 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL,
876 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs,
877 FMT_FLAG_ARG_CONVERT,
878 0, 0, 'p', 0, 'L', 0,
879 NULL, &integer_type_node
880 },
881 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL,
882 NULL, gcc_gfc_flag_pairs,
883 FMT_FLAG_ARG_CONVERT,
884 0, 0, 0, 0, 0, 0,
885 NULL, NULL
886 },
887 { "NSString", NULL, NULL, NULL, NULL,
888 NULL, NULL,
889 FMT_FLAG_ARG_CONVERT|FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL, 0, 0, 0, 0, 0, 0,
890 NULL, NULL
891 },
892 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
893 scanf_flag_specs, scanf_flag_pairs,
894 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK,
895 'w', 0, 0, '*', 'L', 'm',
896 NULL, NULL
897 },
898 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO",
899 strftime_flag_specs, strftime_flag_pairs,
900 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0,
901 NULL, NULL
902 },
903 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL,
904 strfmon_flag_specs, strfmon_flag_pairs,
905 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0,
906 NULL, NULL
907 }
908};
909
910/* This layer of indirection allows GCC to reassign format_types with
911 new data if necessary, while still allowing the original data to be
912 const. */
913static const format_kind_info *format_types = format_types_orig;
914/* We can modify this one. We also add target-specific format types
915 to the end of the array. */
916static format_kind_info *dynamic_format_types;
917
918static int n_format_types = ARRAY_SIZE (format_types_orig);
919
920/* Structure detailing the results of checking a format function call
921 where the format expression may be a conditional expression with
922 many leaves resulting from nested conditional expressions. */
923typedef struct
924{
925 /* Number of leaves of the format argument that could not be checked
926 as they were not string literals. */
927 int number_non_literal;
928 /* Number of leaves of the format argument that were null pointers or
929 string literals, but had extra format arguments. */
930 int number_extra_args;
931 /* Number of leaves of the format argument that were null pointers or
932 string literals, but had extra format arguments and used $ operand
933 numbers. */
934 int number_dollar_extra_args;
935 /* Number of leaves of the format argument that were wide string
936 literals. */
937 int number_wide;
938 /* Number of leaves of the format argument that were empty strings. */
939 int number_empty;
940 /* Number of leaves of the format argument that were unterminated
941 strings. */
942 int number_unterminated;
943 /* Number of leaves of the format argument that were not counted above. */
944 int number_other;
945} format_check_results;
946
947typedef struct
948{
949 format_check_results *res;
950 function_format_info *info;
951 tree params;
952} format_check_context;
953
954/* Return the format name (as specified in the original table) for the format
955 type indicated by format_num. */
956static const char *
957format_name (int format_num)
958{
959 if (format_num >= 0 && format_num < n_format_types)
960 return format_types[format_num].name;
961 gcc_unreachable ();
962}
963
964/* Return the format flags (as specified in the original table) for the format
965 type indicated by format_num. */
966static int
967format_flags (int format_num)
968{
969 if (format_num >= 0 && format_num < n_format_types)
970 return format_types[format_num].flags;
971 gcc_unreachable ();
972}
973
974static void check_format_info (function_format_info *, tree);
975static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT);
976static void check_format_info_main (format_check_results *,
977 function_format_info *,
978 const char *, int, tree,
979 unsigned HOST_WIDE_INT, alloc_pool);
980
981static void init_dollar_format_checking (int, tree);
982static int maybe_read_dollar_number (const char **, int,
983 tree, tree *, const format_kind_info *);
984static bool avoid_dollar_number (const char *);
985static void finish_dollar_format_checking (format_check_results *, int);
986
987static const format_flag_spec *get_flag_spec (const format_flag_spec *,
988 int, const char *);
989
990static void check_format_types (format_wanted_type *);
991static void format_type_warning (format_wanted_type *, tree, tree);
992
993/* Decode a format type from a string, returning the type, or
994 format_type_error if not valid, in which case the caller should print an
995 error message. */
996static int
997decode_format_type (const char *s)
998{
999 int i;
1000 int slen;
1001
1002 s = convert_format_name_to_system_name (s);
1003 slen = strlen (s);
1004 for (i = 0; i < n_format_types; i++)
1005 {
1006 int alen;
1007 if (!strcmp (s, format_types[i].name))
1008 return i;
1009 alen = strlen (format_types[i].name);
1010 if (slen == alen + 4 && s[0] == '_' && s[1] == '_'
1011 && s[slen - 1] == '_' && s[slen - 2] == '_'
1012 && !strncmp (s + 2, format_types[i].name, alen))
1013 return i;
1014 }
1015 return format_type_error;
1016}
1017
1018\f
1019/* Check the argument list of a call to printf, scanf, etc.
1020 ATTRS are the attributes on the function type. There are NARGS argument
1021 values in the array ARGARRAY.
1022 Also, if -Wmissing-format-attribute,
1023 warn for calls to vprintf or vscanf in functions with no such format
1024 attribute themselves. */
1025
1026void
1027check_function_format (tree attrs, int nargs, tree *argarray)
1028{
1029 tree a;
1030
1031 /* See if this function has any format attributes. */
1032 for (a = attrs; a; a = TREE_CHAIN (a))
1033 {
1034 if (is_attribute_p ("format", TREE_PURPOSE (a)))
1035 {
1036 /* Yup; check it. */
1037 function_format_info info;
1038 decode_format_attr (TREE_VALUE (a), &info, 1);
1039 if (warn_format)
1040 {
1041 /* FIXME: Rewrite all the internal functions in this file
1042 to use the ARGARRAY directly instead of constructing this
1043 temporary list. */
1044 tree params = NULL_TREE;
1045 int i;
1046 for (i = nargs - 1; i >= 0; i--)
1047 params = tree_cons (NULL_TREE, argarray[i], params);
1048 check_format_info (&info, params);
1049 }
1050 if (warn_missing_format_attribute && info.first_arg_num == 0
1051 && (format_types[info.format_type].flags
1052 & (int) FMT_FLAG_ARG_CONVERT))
1053 {
1054 tree c;
1055 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
1056 c;
1057 c = TREE_CHAIN (c))
1058 if (is_attribute_p ("format", TREE_PURPOSE (c))
1059 && (decode_format_type (IDENTIFIER_POINTER
1060 (TREE_VALUE (TREE_VALUE (c))))
1061 == info.format_type))
1062 break;
1063 if (c == NULL_TREE)
1064 {
1065 /* Check if the current function has a parameter to which
1066 the format attribute could be attached; if not, it
1067 can't be a candidate for a format attribute, despite
1068 the vprintf-like or vscanf-like call. */
1069 tree args;
1070 for (args = DECL_ARGUMENTS (current_function_decl);
1071 args != 0;
1072 args = DECL_CHAIN (args))
1073 {
1074 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE
1075 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args)))
1076 == char_type_node))
1077 break;
1078 }
1079 if (args != 0)
1080 warning (OPT_Wmissing_format_attribute, "function might "
1081 "be possible candidate for %qs format attribute",
1082 format_types[info.format_type].name);
1083 }
1084 }
1085 }
1086 }
1087}
1088
1089
1090/* Variables used by the checking of $ operand number formats. */
1091static char *dollar_arguments_used = NULL;
1092static char *dollar_arguments_pointer_p = NULL;
1093static int dollar_arguments_alloc = 0;
1094static int dollar_arguments_count;
1095static int dollar_first_arg_num;
1096static int dollar_max_arg_used;
1097static int dollar_format_warned;
1098
1099/* Initialize the checking for a format string that may contain $
1100 parameter number specifications; we will need to keep track of whether
1101 each parameter has been used. FIRST_ARG_NUM is the number of the first
1102 argument that is a parameter to the format, or 0 for a vprintf-style
1103 function; PARAMS is the list of arguments starting at this argument. */
1104
1105static void
1106init_dollar_format_checking (int first_arg_num, tree params)
1107{
1108 tree oparams = params;
1109
1110 dollar_first_arg_num = first_arg_num;
1111 dollar_arguments_count = 0;
1112 dollar_max_arg_used = 0;
1113 dollar_format_warned = 0;
1114 if (first_arg_num > 0)
1115 {
1116 while (params)
1117 {
1118 dollar_arguments_count++;
1119 params = TREE_CHAIN (params);
1120 }
1121 }
1122 if (dollar_arguments_alloc < dollar_arguments_count)
1123 {
1124 free (dollar_arguments_used);
1125 free (dollar_arguments_pointer_p);
1126 dollar_arguments_alloc = dollar_arguments_count;
1127 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc);
1128 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc);
1129 }
1130 if (dollar_arguments_alloc)
1131 {
1132 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1133 if (first_arg_num > 0)
1134 {
1135 int i = 0;
1136 params = oparams;
1137 while (params)
1138 {
1139 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params)))
1140 == POINTER_TYPE);
1141 params = TREE_CHAIN (params);
1142 i++;
1143 }
1144 }
1145 }
1146}
1147
1148
1149/* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1150 is set, it is an error if one is not found; otherwise, it is OK. If
1151 such a number is found, check whether it is within range and mark that
1152 numbered operand as being used for later checking. Returns the operand
1153 number if found and within range, zero if no such number was found and
1154 this is OK, or -1 on error. PARAMS points to the first operand of the
1155 format; PARAM_PTR is made to point to the parameter referred to. If
1156 a $ format is found, *FORMAT is updated to point just after it. */
1157
1158static int
1159maybe_read_dollar_number (const char **format,
1160 int dollar_needed, tree params, tree *param_ptr,
1161 const format_kind_info *fki)
1162{
1163 int argnum;
1164 int overflow_flag;
1165 const char *fcp = *format;
1166 if (!ISDIGIT (*fcp))
1167 {
1168 if (dollar_needed)
1169 {
1170 warning (OPT_Wformat, "missing $ operand number in format");
1171 return -1;
1172 }
1173 else
1174 return 0;
1175 }
1176 argnum = 0;
1177 overflow_flag = 0;
1178 while (ISDIGIT (*fcp))
1179 {
1180 int nargnum;
1181 nargnum = 10 * argnum + (*fcp - '0');
1182 if (nargnum < 0 || nargnum / 10 != argnum)
1183 overflow_flag = 1;
1184 argnum = nargnum;
1185 fcp++;
1186 }
1187 if (*fcp != '$')
1188 {
1189 if (dollar_needed)
1190 {
1191 warning (OPT_Wformat, "missing $ operand number in format");
1192 return -1;
1193 }
1194 else
1195 return 0;
1196 }
1197 *format = fcp + 1;
1198 if (pedantic && !dollar_format_warned)
1199 {
1200 warning (OPT_Wformat, "%s does not support %%n$ operand number formats",
1201 C_STD_NAME (STD_EXT));
1202 dollar_format_warned = 1;
1203 }
1204 if (overflow_flag || argnum == 0
1205 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1206 {
1207 warning (OPT_Wformat, "operand number out of range in format");
1208 return -1;
1209 }
1210 if (argnum > dollar_max_arg_used)
1211 dollar_max_arg_used = argnum;
1212 /* For vprintf-style functions we may need to allocate more memory to
1213 track which arguments are used. */
1214 while (dollar_arguments_alloc < dollar_max_arg_used)
1215 {
1216 int nalloc;
1217 nalloc = 2 * dollar_arguments_alloc + 16;
1218 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used,
1219 nalloc);
1220 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p,
1221 nalloc);
1222 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1223 nalloc - dollar_arguments_alloc);
1224 dollar_arguments_alloc = nalloc;
1225 }
1226 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE)
1227 && dollar_arguments_used[argnum - 1] == 1)
1228 {
1229 dollar_arguments_used[argnum - 1] = 2;
1230 warning (OPT_Wformat, "format argument %d used more than once in %s format",
1231 argnum, fki->name);
1232 }
1233 else
1234 dollar_arguments_used[argnum - 1] = 1;
1235 if (dollar_first_arg_num)
1236 {
1237 int i;
1238 *param_ptr = params;
1239 for (i = 1; i < argnum && *param_ptr != 0; i++)
1240 *param_ptr = TREE_CHAIN (*param_ptr);
1241
1242 /* This case shouldn't be caught here. */
1243 gcc_assert (*param_ptr);
1244 }
1245 else
1246 *param_ptr = 0;
1247 return argnum;
1248}
1249
1250/* Ensure that FORMAT does not start with a decimal number followed by
1251 a $; give a diagnostic and return true if it does, false otherwise. */
1252
1253static bool
1254avoid_dollar_number (const char *format)
1255{
1256 if (!ISDIGIT (*format))
1257 return false;
1258 while (ISDIGIT (*format))
1259 format++;
1260 if (*format == '$')
1261 {
1262 warning (OPT_Wformat, "$ operand number used after format without operand number");
1263 return true;
1264 }
1265 return false;
1266}
1267
1268
1269/* Finish the checking for a format string that used $ operand number formats
1270 instead of non-$ formats. We check for unused operands before used ones
1271 (a serious error, since the implementation of the format function
1272 can't know what types to pass to va_arg to find the later arguments).
1273 and for unused operands at the end of the format (if we know how many
1274 arguments the format had, so not for vprintf). If there were operand
1275 numbers out of range on a non-vprintf-style format, we won't have reached
1276 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1277 pointers. */
1278
1279static void
1280finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok)
1281{
1282 int i;
1283 bool found_pointer_gap = false;
1284 for (i = 0; i < dollar_max_arg_used; i++)
1285 {
1286 if (!dollar_arguments_used[i])
1287 {
1288 if (pointer_gap_ok && (dollar_first_arg_num == 0
1289 || dollar_arguments_pointer_p[i]))
1290 found_pointer_gap = true;
1291 else
1292 warning (OPT_Wformat,
1293 "format argument %d unused before used argument %d in $-style format",
1294 i + 1, dollar_max_arg_used);
1295 }
1296 }
1297 if (found_pointer_gap
1298 || (dollar_first_arg_num
1299 && dollar_max_arg_used < dollar_arguments_count))
1300 {
1301 res->number_other--;
1302 res->number_dollar_extra_args++;
1303 }
1304}
1305
1306
1307/* Retrieve the specification for a format flag. SPEC contains the
1308 specifications for format flags for the applicable kind of format.
1309 FLAG is the flag in question. If PREDICATES is NULL, the basic
1310 spec for that flag must be retrieved and must exist. If
1311 PREDICATES is not NULL, it is a string listing possible predicates
1312 for the spec entry; if an entry predicated on any of these is
1313 found, it is returned, otherwise NULL is returned. */
1314
1315static const format_flag_spec *
1316get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates)
1317{
1318 int i;
1319 for (i = 0; spec[i].flag_char != 0; i++)
1320 {
1321 if (spec[i].flag_char != flag)
1322 continue;
1323 if (predicates != NULL)
1324 {
1325 if (spec[i].predicate != 0
1326 && strchr (predicates, spec[i].predicate) != 0)
1327 return &spec[i];
1328 }
1329 else if (spec[i].predicate == 0)
1330 return &spec[i];
1331 }
1332 gcc_assert (predicates);
1333 return NULL;
1334}
1335
1336
1337/* Check the argument list of a call to printf, scanf, etc.
1338 INFO points to the function_format_info structure.
1339 PARAMS is the list of argument values. */
1340
1341static void
1342check_format_info (function_format_info *info, tree params)
1343{
1344 format_check_context format_ctx;
1345 unsigned HOST_WIDE_INT arg_num;
1346 tree format_tree;
1347 format_check_results res;
1348 /* Skip to format argument. If the argument isn't available, there's
1349 no work for us to do; prototype checking will catch the problem. */
1350 for (arg_num = 1; ; ++arg_num)
1351 {
1352 if (params == 0)
1353 return;
1354 if (arg_num == info->format_num)
1355 break;
1356 params = TREE_CHAIN (params);
1357 }
1358 format_tree = TREE_VALUE (params);
1359 params = TREE_CHAIN (params);
1360 if (format_tree == 0)
1361 return;
1362
1363 res.number_non_literal = 0;
1364 res.number_extra_args = 0;
1365 res.number_dollar_extra_args = 0;
1366 res.number_wide = 0;
1367 res.number_empty = 0;
1368 res.number_unterminated = 0;
1369 res.number_other = 0;
1370
1371 format_ctx.res = &res;
1372 format_ctx.info = info;
1373 format_ctx.params = params;
1374
1375 check_function_arguments_recurse (check_format_arg, &format_ctx,
1376 format_tree, arg_num);
1377
1378 if (res.number_non_literal > 0)
1379 {
1380 /* Functions taking a va_list normally pass a non-literal format
1381 string. These functions typically are declared with
1382 first_arg_num == 0, so avoid warning in those cases. */
1383 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT))
1384 {
1385 /* For strftime-like formats, warn for not checking the format
1386 string; but there are no arguments to check. */
1387 warning (OPT_Wformat_nonliteral,
1388 "format not a string literal, format string not checked");
1389 }
1390 else if (info->first_arg_num != 0)
1391 {
1392 /* If there are no arguments for the format at all, we may have
1393 printf (foo) which is likely to be a security hole. */
1394 while (arg_num + 1 < info->first_arg_num)
1395 {
1396 if (params == 0)
1397 break;
1398 params = TREE_CHAIN (params);
1399 ++arg_num;
1400 }
1401 if (params == 0 && warn_format_security)
1402 warning (OPT_Wformat_security,
1403 "format not a string literal and no format arguments");
1404 else if (params == 0 && warn_format_nonliteral)
1405 warning (OPT_Wformat_nonliteral,
1406 "format not a string literal and no format arguments");
1407 else
1408 warning (OPT_Wformat_nonliteral,
1409 "format not a string literal, argument types not checked");
1410 }
1411 }
1412
1413 /* If there were extra arguments to the format, normally warn. However,
1414 the standard does say extra arguments are ignored, so in the specific
1415 case where we have multiple leaves (conditional expressions or
1416 ngettext) allow extra arguments if at least one leaf didn't have extra
1417 arguments, but was otherwise OK (either non-literal or checked OK).
1418 If the format is an empty string, this should be counted similarly to the
1419 case of extra format arguments. */
1420 if (res.number_extra_args > 0 && res.number_non_literal == 0
1421 && res.number_other == 0)
1422 warning (OPT_Wformat_extra_args, "too many arguments for format");
1423 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
1424 && res.number_other == 0)
1425 warning (OPT_Wformat_extra_args, "unused arguments in $-style format");
1426 if (res.number_empty > 0 && res.number_non_literal == 0
1427 && res.number_other == 0)
1428 warning (OPT_Wformat_zero_length, "zero-length %s format string",
1429 format_types[info->format_type].name);
1430
1431 if (res.number_wide > 0)
1432 warning (OPT_Wformat, "format is a wide character string");
1433
1434 if (res.number_unterminated > 0)
1435 warning (OPT_Wformat, "unterminated format string");
1436}
1437
1438/* Callback from check_function_arguments_recurse to check a
1439 format string. FORMAT_TREE is the format parameter. ARG_NUM
1440 is the number of the format argument. CTX points to a
1441 format_check_context. */
1442
1443static void
1444check_format_arg (void *ctx, tree format_tree,
1445 unsigned HOST_WIDE_INT arg_num)
1446{
1447 format_check_context *format_ctx = (format_check_context *) ctx;
1448 format_check_results *res = format_ctx->res;
1449 function_format_info *info = format_ctx->info;
1450 tree params = format_ctx->params;
1451
1452 int format_length;
1453 HOST_WIDE_INT offset;
1454 const char *format_chars;
1455 tree array_size = 0;
1456 tree array_init;
1457 alloc_pool fwt_pool;
1458
1459 if (integer_zerop (format_tree))
1460 {
1461 /* Skip to first argument to check, so we can see if this format
1462 has any arguments (it shouldn't). */
1463 while (arg_num + 1 < info->first_arg_num)
1464 {
1465 if (params == 0)
1466 return;
1467 params = TREE_CHAIN (params);
1468 ++arg_num;
1469 }
1470
1471 if (params == 0)
1472 res->number_other++;
1473 else
1474 res->number_extra_args++;
1475
1476 return;
1477 }
1478
1479 offset = 0;
1480 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR)
1481 {
1482 tree arg0, arg1;
1483
1484 arg0 = TREE_OPERAND (format_tree, 0);
1485 arg1 = TREE_OPERAND (format_tree, 1);
1486 STRIP_NOPS (arg0);
1487 STRIP_NOPS (arg1);
1488 if (TREE_CODE (arg1) == INTEGER_CST)
1489 format_tree = arg0;
1490 else
1491 {
1492 res->number_non_literal++;
1493 return;
1494 }
1495 if (!host_integerp (arg1, 0)
1496 || (offset = tree_low_cst (arg1, 0)) < 0)
1497 {
1498 res->number_non_literal++;
1499 return;
1500 }
1501 }
1502 if (TREE_CODE (format_tree) != ADDR_EXPR)
1503 {
1504 res->number_non_literal++;
1505 return;
1506 }
1507 format_tree = TREE_OPERAND (format_tree, 0);
1508 if (format_types[info->format_type].flags
1509 & (int) FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL)
1510 {
1511 bool objc_str = (info->format_type == gcc_objc_string_format_type);
1512 /* We cannot examine this string here - but we can check that it is
1513 a valid type. */
1514 if (TREE_CODE (format_tree) != CONST_DECL
1515 || !((objc_str && objc_string_ref_type_p (TREE_TYPE (format_tree)))
1516 || (*targetcm.string_object_ref_type_p)
1517 ((const_tree) TREE_TYPE (format_tree))))
1518 {
1519 res->number_non_literal++;
1520 return;
1521 }
1522 /* Skip to first argument to check. */
1523 while (arg_num + 1 < info->first_arg_num)
1524 {
1525 if (params == 0)
1526 return;
1527 params = TREE_CHAIN (params);
1528 ++arg_num;
1529 }
1530 /* So, we have a valid literal string object and one or more params.
1531 We need to use an external helper to parse the string into format
1532 info. For Objective-C variants we provide the resource within the
1533 objc tree, for target variants, via a hook. */
1534 if (objc_str)
1535 objc_check_format_arg (format_tree, params);
1536 else if (targetcm.check_string_object_format_arg)
1537 (*targetcm.check_string_object_format_arg) (format_tree, params);
1538 /* Else we can't handle it and retire quietly. */
1539 return;
1540 }
1541 if (TREE_CODE (format_tree) == ARRAY_REF
1542 && host_integerp (TREE_OPERAND (format_tree, 1), 0)
1543 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0)
1544 format_tree = TREE_OPERAND (format_tree, 0);
1545 if (TREE_CODE (format_tree) == VAR_DECL
1546 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE
1547 && (array_init = decl_constant_value (format_tree)) != format_tree
1548 && TREE_CODE (array_init) == STRING_CST)
1549 {
1550 /* Extract the string constant initializer. Note that this may include
1551 a trailing NUL character that is not in the array (e.g.
1552 const char a[3] = "foo";). */
1553 array_size = DECL_SIZE_UNIT (format_tree);
1554 format_tree = array_init;
1555 }
1556 if (TREE_CODE (format_tree) != STRING_CST)
1557 {
1558 res->number_non_literal++;
1559 return;
1560 }
1561 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
1562 {
1563 res->number_wide++;
1564 return;
1565 }
1566 format_chars = TREE_STRING_POINTER (format_tree);
1567 format_length = TREE_STRING_LENGTH (format_tree);
1568 if (array_size != 0)
1569 {
1570 /* Variable length arrays can't be initialized. */
1571 gcc_assert (TREE_CODE (array_size) == INTEGER_CST);
1572
1573 if (host_integerp (array_size, 0))
1574 {
1575 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size);
1576 if (array_size_value > 0
1577 && array_size_value == (int) array_size_value
1578 && format_length > array_size_value)
1579 format_length = array_size_value;
1580 }
1581 }
1582 if (offset)
1583 {
1584 if (offset >= format_length)
1585 {
1586 res->number_non_literal++;
1587 return;
1588 }
1589 format_chars += offset;
1590 format_length -= offset;
1591 }
1592 if (format_length < 1 || format_chars[--format_length] != 0)
1593 {
1594 res->number_unterminated++;
1595 return;
1596 }
1597 if (format_length == 0)
1598 {
1599 res->number_empty++;
1600 return;
1601 }
1602
1603 /* Skip to first argument to check. */
1604 while (arg_num + 1 < info->first_arg_num)
1605 {
1606 if (params == 0)
1607 return;
1608 params = TREE_CHAIN (params);
1609 ++arg_num;
1610 }
1611 /* Provisionally increment res->number_other; check_format_info_main
1612 will decrement it if it finds there are extra arguments, but this way
1613 need not adjust it for every return. */
1614 res->number_other++;
1615 fwt_pool = create_alloc_pool ("format_wanted_type pool",
1616 sizeof (format_wanted_type), 10);
1617 check_format_info_main (res, info, format_chars, format_length,
1618 params, arg_num, fwt_pool);
1619 free_alloc_pool (fwt_pool);
1620}
1621
1622
1623/* Do the main part of checking a call to a format function. FORMAT_CHARS
1624 is the NUL-terminated format string (which at this point may contain
1625 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1626 terminating NUL character). ARG_NUM is one less than the number of
1627 the first format argument to check; PARAMS points to that format
1628 argument in the list of arguments. */
1629
1630static void
1631check_format_info_main (format_check_results *res,
1632 function_format_info *info, const char *format_chars,
1633 int format_length, tree params,
1634 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool)
1635{
1636 const char *orig_format_chars = format_chars;
1637 tree first_fillin_param = params;
1638
1639 const format_kind_info *fki = &format_types[info->format_type];
1640 const format_flag_spec *flag_specs = fki->flag_specs;
1641 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
1642
1643 /* -1 if no conversions taking an operand have been found; 0 if one has
1644 and it didn't use $; 1 if $ formats are in use. */
1645 int has_operand_number = -1;
1646
1647 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
1648
1649 while (*format_chars != 0)
1650 {
1651 int i;
1652 int suppressed = FALSE;
1653 const char *length_chars = NULL;
1654 enum format_lengths length_chars_val = FMT_LEN_none;
1655 enum format_std_version length_chars_std = STD_C89;
1656 int format_char;
1657 tree cur_param;
1658 tree wanted_type;
1659 int main_arg_num = 0;
1660 tree main_arg_params = 0;
1661 enum format_std_version wanted_type_std;
1662 const char *wanted_type_name;
1663 format_wanted_type width_wanted_type;
1664 format_wanted_type precision_wanted_type;
1665 format_wanted_type main_wanted_type;
1666 format_wanted_type *first_wanted_type = NULL;
1667 format_wanted_type *last_wanted_type = NULL;
1668 const format_length_info *fli = NULL;
1669 const format_char_info *fci = NULL;
1670 char flag_chars[256];
1671 int alloc_flag = 0;
1672 int scalar_identity_flag = 0;
1673 const char *format_start;
1674
1675 if (*format_chars++ != '%')
1676 continue;
1677 if (*format_chars == 0)
1678 {
1679 warning (OPT_Wformat, "spurious trailing %<%%%> in format");
1680 continue;
1681 }
1682 if (*format_chars == '%')
1683 {
1684 ++format_chars;
1685 continue;
1686 }
1687 flag_chars[0] = 0;
1688
1689 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0)
1690 {
1691 /* Possibly read a $ operand number at the start of the format.
1692 If one was previously used, one is required here. If one
1693 is not used here, we can't immediately conclude this is a
1694 format without them, since it could be printf %m or scanf %*. */
1695 int opnum;
1696 opnum = maybe_read_dollar_number (&format_chars, 0,
1697 first_fillin_param,
1698 &main_arg_params, fki);
1699 if (opnum == -1)
1700 return;
1701 else if (opnum > 0)
1702 {
1703 has_operand_number = 1;
1704 main_arg_num = opnum + info->first_arg_num - 1;
1705 }
1706 }
1707 else if (fki->flags & FMT_FLAG_USE_DOLLAR)
1708 {
1709 if (avoid_dollar_number (format_chars))
1710 return;
1711 }
1712
1713 /* Read any format flags, but do not yet validate them beyond removing
1714 duplicates, since in general validation depends on the rest of
1715 the format. */
1716 while (*format_chars != 0
1717 && strchr (fki->flag_chars, *format_chars) != 0)
1718 {
1719 const format_flag_spec *s = get_flag_spec (flag_specs,
1720 *format_chars, NULL);
1721 if (strchr (flag_chars, *format_chars) != 0)
1722 {
1723 warning (OPT_Wformat, "repeated %s in format", _(s->name));
1724 }
1725 else
1726 {
1727 i = strlen (flag_chars);
1728 flag_chars[i++] = *format_chars;
1729 flag_chars[i] = 0;
1730 }
1731 if (s->skip_next_char)
1732 {
1733 ++format_chars;
1734 if (*format_chars == 0)
1735 {
1736 warning (OPT_Wformat, "missing fill character at end of strfmon format");
1737 return;
1738 }
1739 }
1740 ++format_chars;
1741 }
1742
1743 /* Read any format width, possibly * or *m$. */
1744 if (fki->width_char != 0)
1745 {
1746 if (fki->width_type != NULL && *format_chars == '*')
1747 {
1748 i = strlen (flag_chars);
1749 flag_chars[i++] = fki->width_char;
1750 flag_chars[i] = 0;
1751 /* "...a field width...may be indicated by an asterisk.
1752 In this case, an int argument supplies the field width..." */
1753 ++format_chars;
1754 if (has_operand_number != 0)
1755 {
1756 int opnum;
1757 opnum = maybe_read_dollar_number (&format_chars,
1758 has_operand_number == 1,
1759 first_fillin_param,
1760 &params, fki);
1761 if (opnum == -1)
1762 return;
1763 else if (opnum > 0)
1764 {
1765 has_operand_number = 1;
1766 arg_num = opnum + info->first_arg_num - 1;
1767 }
1768 else
1769 has_operand_number = 0;
1770 }
1771 else
1772 {
1773 if (avoid_dollar_number (format_chars))
1774 return;
1775 }
1776 if (info->first_arg_num != 0)
1777 {
1778 if (params == 0)
1779 cur_param = NULL;
1780 else
1781 {
1782 cur_param = TREE_VALUE (params);
1783 if (has_operand_number <= 0)
1784 {
1785 params = TREE_CHAIN (params);
1786 ++arg_num;
1787 }
1788 }
1789 width_wanted_type.wanted_type = *fki->width_type;
1790 width_wanted_type.wanted_type_name = NULL;
1791 width_wanted_type.pointer_count = 0;
1792 width_wanted_type.char_lenient_flag = 0;
1793 width_wanted_type.scalar_identity_flag = 0;
1794 width_wanted_type.writing_in_flag = 0;
1795 width_wanted_type.reading_from_flag = 0;
1796 width_wanted_type.kind = CF_KIND_FIELD_WIDTH;
1797 width_wanted_type.format_start = format_chars - 1;
1798 width_wanted_type.format_length = 1;
1799 width_wanted_type.param = cur_param;
1800 width_wanted_type.arg_num = arg_num;
1801 width_wanted_type.next = NULL;
1802 if (last_wanted_type != 0)
1803 last_wanted_type->next = &width_wanted_type;
1804 if (first_wanted_type == 0)
1805 first_wanted_type = &width_wanted_type;
1806 last_wanted_type = &width_wanted_type;
1807 }
1808 }
1809 else
1810 {
1811 /* Possibly read a numeric width. If the width is zero,
1812 we complain if appropriate. */
1813 int non_zero_width_char = FALSE;
1814 int found_width = FALSE;
1815 while (ISDIGIT (*format_chars))
1816 {
1817 found_width = TRUE;
1818 if (*format_chars != '0')
1819 non_zero_width_char = TRUE;
1820 ++format_chars;
1821 }
1822 if (found_width && !non_zero_width_char &&
1823 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD))
1824 warning (OPT_Wformat, "zero width in %s format", fki->name);
1825 if (found_width)
1826 {
1827 i = strlen (flag_chars);
1828 flag_chars[i++] = fki->width_char;
1829 flag_chars[i] = 0;
1830 }
1831 }
1832 }
1833
1834 /* Read any format left precision (must be a number, not *). */
1835 if (fki->left_precision_char != 0 && *format_chars == '#')
1836 {
1837 ++format_chars;
1838 i = strlen (flag_chars);
1839 flag_chars[i++] = fki->left_precision_char;
1840 flag_chars[i] = 0;
1841 if (!ISDIGIT (*format_chars))
1842 warning (OPT_Wformat, "empty left precision in %s format", fki->name);
1843 while (ISDIGIT (*format_chars))
1844 ++format_chars;
1845 }
1846
1847 /* Read any format precision, possibly * or *m$. */
1848 if (fki->precision_char != 0 && *format_chars == '.')
1849 {
1850 ++format_chars;
1851 i = strlen (flag_chars);
1852 flag_chars[i++] = fki->precision_char;
1853 flag_chars[i] = 0;
1854 if (fki->precision_type != NULL && *format_chars == '*')
1855 {
1856 /* "...a...precision...may be indicated by an asterisk.
1857 In this case, an int argument supplies the...precision." */
1858 ++format_chars;
1859 if (has_operand_number != 0)
1860 {
1861 int opnum;
1862 opnum = maybe_read_dollar_number (&format_chars,
1863 has_operand_number == 1,
1864 first_fillin_param,
1865 &params, fki);
1866 if (opnum == -1)
1867 return;
1868 else if (opnum > 0)
1869 {
1870 has_operand_number = 1;
1871 arg_num = opnum + info->first_arg_num - 1;
1872 }
1873 else
1874 has_operand_number = 0;
1875 }
1876 else
1877 {
1878 if (avoid_dollar_number (format_chars))
1879 return;
1880 }
1881 if (info->first_arg_num != 0)
1882 {
1883 if (params == 0)
1884 cur_param = NULL;
1885 else
1886 {
1887 cur_param = TREE_VALUE (params);
1888 if (has_operand_number <= 0)
1889 {
1890 params = TREE_CHAIN (params);
1891 ++arg_num;
1892 }
1893 }
1894 precision_wanted_type.wanted_type = *fki->precision_type;
1895 precision_wanted_type.wanted_type_name = NULL;
1896 precision_wanted_type.pointer_count = 0;
1897 precision_wanted_type.char_lenient_flag = 0;
1898 precision_wanted_type.scalar_identity_flag = 0;
1899 precision_wanted_type.writing_in_flag = 0;
1900 precision_wanted_type.reading_from_flag = 0;
1901 precision_wanted_type.kind = CF_KIND_FIELD_PRECISION;
1902 precision_wanted_type.param = cur_param;
1903 precision_wanted_type.format_start = format_chars - 2;
1904 precision_wanted_type.format_length = 2;
1905 precision_wanted_type.arg_num = arg_num;
1906 precision_wanted_type.next = NULL;
1907 if (last_wanted_type != 0)
1908 last_wanted_type->next = &precision_wanted_type;
1909 if (first_wanted_type == 0)
1910 first_wanted_type = &precision_wanted_type;
1911 last_wanted_type = &precision_wanted_type;
1912 }
1913 }
1914 else
1915 {
1916 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK)
1917 && !ISDIGIT (*format_chars))
1918 warning (OPT_Wformat, "empty precision in %s format", fki->name);
1919 while (ISDIGIT (*format_chars))
1920 ++format_chars;
1921 }
1922 }
1923
1924 format_start = format_chars;
1925 if (fki->alloc_char && fki->alloc_char == *format_chars)
1926 {
1927 i = strlen (flag_chars);
1928 flag_chars[i++] = fki->alloc_char;
1929 flag_chars[i] = 0;
1930 format_chars++;
1931 }
1932
1933 /* Handle the scanf allocation kludge. */
1934 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
1935 {
1936 if (*format_chars == 'a' && !flag_isoc99)
1937 {
1938 if (format_chars[1] == 's' || format_chars[1] == 'S'
1939 || format_chars[1] == '[')
1940 {
1941 /* 'a' is used as a flag. */
1942 i = strlen (flag_chars);
1943 flag_chars[i++] = 'a';
1944 flag_chars[i] = 0;
1945 format_chars++;
1946 }
1947 }
1948 }
1949
1950 /* Read any length modifier, if this kind of format has them. */
1951 fli = fki->length_char_specs;
1952 length_chars = NULL;
1953 length_chars_val = FMT_LEN_none;
1954 length_chars_std = STD_C89;
1955 scalar_identity_flag = 0;
1956 if (fli)
1957 {
1958 while (fli->name != 0
1959 && strncmp (fli->name, format_chars, strlen (fli->name)))
1960 fli++;
fdc4107c
JM
1961 /*
1962 * DragonFly's D conversion needs to have precedence
1963 * over the DD length modifier
1964 */
1965 if (fli->index == FMT_LEN_D
1966 && fki->conversion_specs == print_char_table)
1967 while (fli->name != 0)
1968 fli++;
e4b17023
JM
1969 if (fli->name != 0)
1970 {
1971 format_chars += strlen (fli->name);
1972 if (fli->double_name != 0 && fli->name[0] == *format_chars)
1973 {
1974 format_chars++;
1975 length_chars = fli->double_name;
1976 length_chars_val = fli->double_index;
1977 length_chars_std = fli->double_std;
1978 }
1979 else
1980 {
1981 length_chars = fli->name;
1982 length_chars_val = fli->index;
1983 length_chars_std = fli->std;
1984 scalar_identity_flag = fli->scalar_identity_flag;
1985 }
1986 i = strlen (flag_chars);
1987 flag_chars[i++] = fki->length_code_char;
1988 flag_chars[i] = 0;
1989 }
1990 if (pedantic)
1991 {
1992 /* Warn if the length modifier is non-standard. */
1993 if (ADJ_STD (length_chars_std) > C_STD_VER)
1994 warning (OPT_Wformat,
1995 "%s does not support the %qs %s length modifier",
1996 C_STD_NAME (length_chars_std), length_chars,
1997 fki->name);
1998 }
1999 }
2000
2001 /* Read any modifier (strftime E/O). */
2002 if (fki->modifier_chars != NULL)
2003 {
2004 while (*format_chars != 0
2005 && strchr (fki->modifier_chars, *format_chars) != 0)
2006 {
2007 if (strchr (flag_chars, *format_chars) != 0)
2008 {
2009 const format_flag_spec *s = get_flag_spec (flag_specs,
2010 *format_chars, NULL);
2011 warning (OPT_Wformat, "repeated %s in format", _(s->name));
2012 }
2013 else
2014 {
2015 i = strlen (flag_chars);
2016 flag_chars[i++] = *format_chars;
2017 flag_chars[i] = 0;
2018 }
2019 ++format_chars;
2020 }
2021 }
2022
2023 format_char = *format_chars;
2024 if (format_char == 0
2025 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK)
2026 && format_char == '%'))
2027 {
2028 warning (OPT_Wformat, "conversion lacks type at end of format");
2029 continue;
2030 }
2031 format_chars++;
2032 fci = fki->conversion_specs;
2033 while (fci->format_chars != 0
2034 && strchr (fci->format_chars, format_char) == 0)
2035 ++fci;
2036 if (fci->format_chars == 0)
2037 {
2038 if (ISGRAPH (format_char))
2039 warning (OPT_Wformat, "unknown conversion type character %qc in format",
2040 format_char);
2041 else
2042 warning (OPT_Wformat, "unknown conversion type character 0x%x in format",
2043 format_char);
2044 continue;
2045 }
2046 if (pedantic)
2047 {
2048 if (ADJ_STD (fci->std) > C_STD_VER)
2049 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format",
2050 C_STD_NAME (fci->std), format_char, fki->name);
2051 }
2052
2053 /* Validate the individual flags used, removing any that are invalid. */
2054 {
2055 int d = 0;
2056 for (i = 0; flag_chars[i] != 0; i++)
2057 {
2058 const format_flag_spec *s = get_flag_spec (flag_specs,
2059 flag_chars[i], NULL);
2060 flag_chars[i - d] = flag_chars[i];
2061 if (flag_chars[i] == fki->length_code_char)
2062 continue;
2063 if (strchr (fci->flag_chars, flag_chars[i]) == 0)
2064 {
2065 warning (OPT_Wformat, "%s used with %<%%%c%> %s format",
2066 _(s->name), format_char, fki->name);
2067 d++;
2068 continue;
2069 }
2070 if (pedantic)
2071 {
2072 const format_flag_spec *t;
2073 if (ADJ_STD (s->std) > C_STD_VER)
2074 warning (OPT_Wformat, "%s does not support %s",
2075 C_STD_NAME (s->std), _(s->long_name));
2076 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
2077 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std))
2078 {
2079 const char *long_name = (t->long_name != NULL
2080 ? t->long_name
2081 : s->long_name);
2082 if (ADJ_STD (t->std) > C_STD_VER)
2083 warning (OPT_Wformat,
2084 "%s does not support %s with the %<%%%c%> %s format",
2085 C_STD_NAME (t->std), _(long_name),
2086 format_char, fki->name);
2087 }
2088 }
2089 }
2090 flag_chars[i - d] = 0;
2091 }
2092
2093 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE)
2094 && strchr (flag_chars, 'a') != 0)
2095 alloc_flag = 1;
2096 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0)
2097 alloc_flag = 1;
2098
2099 if (fki->suppression_char
2100 && strchr (flag_chars, fki->suppression_char) != 0)
2101 suppressed = 1;
2102
2103 /* Validate the pairs of flags used. */
2104 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
2105 {
2106 const format_flag_spec *s, *t;
2107 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
2108 continue;
2109 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
2110 continue;
2111 if (bad_flag_pairs[i].predicate != 0
2112 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0)
2113 continue;
2114 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
2115 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
2116 if (bad_flag_pairs[i].ignored)
2117 {
2118 if (bad_flag_pairs[i].predicate != 0)
2119 warning (OPT_Wformat,
2120 "%s ignored with %s and %<%%%c%> %s format",
2121 _(s->name), _(t->name), format_char,
2122 fki->name);
2123 else
2124 warning (OPT_Wformat, "%s ignored with %s in %s format",
2125 _(s->name), _(t->name), fki->name);
2126 }
2127 else
2128 {
2129 if (bad_flag_pairs[i].predicate != 0)
2130 warning (OPT_Wformat,
2131 "use of %s and %s together with %<%%%c%> %s format",
2132 _(s->name), _(t->name), format_char,
2133 fki->name);
2134 else
2135 warning (OPT_Wformat, "use of %s and %s together in %s format",
2136 _(s->name), _(t->name), fki->name);
2137 }
2138 }
2139
2140 /* Give Y2K warnings. */
2141 if (warn_format_y2k)
2142 {
2143 int y2k_level = 0;
2144 if (strchr (fci->flags2, '4') != 0)
2145 if (strchr (flag_chars, 'E') != 0)
2146 y2k_level = 3;
2147 else
2148 y2k_level = 2;
2149 else if (strchr (fci->flags2, '3') != 0)
2150 y2k_level = 3;
2151 else if (strchr (fci->flags2, '2') != 0)
2152 y2k_level = 2;
2153 if (y2k_level == 3)
2154 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
2155 "year in some locales", format_char);
2156 else if (y2k_level == 2)
2157 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of "
2158 "year", format_char);
2159 }
2160
2161 if (strchr (fci->flags2, '[') != 0)
2162 {
2163 /* Skip over scan set, in case it happens to have '%' in it. */
2164 if (*format_chars == '^')
2165 ++format_chars;
2166 /* Find closing bracket; if one is hit immediately, then
2167 it's part of the scan set rather than a terminator. */
2168 if (*format_chars == ']')
2169 ++format_chars;
2170 while (*format_chars && *format_chars != ']')
2171 ++format_chars;
2172 if (*format_chars != ']')
2173 /* The end of the format string was reached. */
2174 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format");
2175 }
2176
2177 wanted_type = 0;
2178 wanted_type_name = 0;
2179 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT)
2180 {
2181 wanted_type = (fci->types[length_chars_val].type
2182 ? *fci->types[length_chars_val].type : 0);
2183 wanted_type_name = fci->types[length_chars_val].name;
2184 wanted_type_std = fci->types[length_chars_val].std;
2185 if (wanted_type == 0)
2186 {
2187 warning (OPT_Wformat,
2188 "use of %qs length modifier with %qc type character",
2189 length_chars, format_char);
2190 /* Heuristic: skip one argument when an invalid length/type
2191 combination is encountered. */
2192 arg_num++;
2193 if (params != 0)
2194 params = TREE_CHAIN (params);
2195 continue;
2196 }
2197 else if (pedantic
2198 /* Warn if non-standard, provided it is more non-standard
2199 than the length and type characters that may already
2200 have been warned for. */
2201 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std)
2202 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std))
2203 {
2204 if (ADJ_STD (wanted_type_std) > C_STD_VER)
2205 warning (OPT_Wformat,
2206 "%s does not support the %<%%%s%c%> %s format",
2207 C_STD_NAME (wanted_type_std), length_chars,
2208 format_char, fki->name);
2209 }
2210 }
2211
2212 main_wanted_type.next = NULL;
2213
2214 /* Finally. . .check type of argument against desired type! */
2215 if (info->first_arg_num == 0)
2216 continue;
2217 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2218 || suppressed)
2219 {
2220 if (main_arg_num != 0)
2221 {
2222 if (suppressed)
2223 warning (OPT_Wformat, "operand number specified with "
2224 "suppressed assignment");
2225 else
2226 warning (OPT_Wformat, "operand number specified for format "
2227 "taking no argument");
2228 }
2229 }
2230 else
2231 {
2232 format_wanted_type *wanted_type_ptr;
2233
2234 if (main_arg_num != 0)
2235 {
2236 arg_num = main_arg_num;
2237 params = main_arg_params;
2238 }
2239 else
2240 {
2241 ++arg_num;
2242 if (has_operand_number > 0)
2243 {
2244 warning (OPT_Wformat, "missing $ operand number in format");
2245 return;
2246 }
2247 else
2248 has_operand_number = 0;
2249 }
2250
2251 wanted_type_ptr = &main_wanted_type;
2252 while (fci)
2253 {
2254 if (params == 0)
2255 cur_param = NULL;
2256 else
2257 {
2258 cur_param = TREE_VALUE (params);
2259 params = TREE_CHAIN (params);
2260 }
2261
2262 wanted_type_ptr->wanted_type = wanted_type;
2263 wanted_type_ptr->wanted_type_name = wanted_type_name;
2264 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag;
2265 wanted_type_ptr->char_lenient_flag = 0;
2266 if (strchr (fci->flags2, 'c') != 0)
2267 wanted_type_ptr->char_lenient_flag = 1;
2268 wanted_type_ptr->scalar_identity_flag = 0;
2269 if (scalar_identity_flag)
2270 wanted_type_ptr->scalar_identity_flag = 1;
2271 wanted_type_ptr->writing_in_flag = 0;
2272 wanted_type_ptr->reading_from_flag = 0;
2273 if (alloc_flag)
2274 wanted_type_ptr->writing_in_flag = 1;
2275 else
2276 {
2277 if (strchr (fci->flags2, 'W') != 0)
2278 wanted_type_ptr->writing_in_flag = 1;
2279 if (strchr (fci->flags2, 'R') != 0)
2280 wanted_type_ptr->reading_from_flag = 1;
2281 }
2282 wanted_type_ptr->kind = CF_KIND_FORMAT;
2283 wanted_type_ptr->param = cur_param;
2284 wanted_type_ptr->arg_num = arg_num;
2285 wanted_type_ptr->format_start = format_start;
2286 wanted_type_ptr->format_length = format_chars - format_start;
2287 wanted_type_ptr->next = NULL;
2288 if (last_wanted_type != 0)
2289 last_wanted_type->next = wanted_type_ptr;
2290 if (first_wanted_type == 0)
2291 first_wanted_type = wanted_type_ptr;
2292 last_wanted_type = wanted_type_ptr;
2293
2294 fci = fci->chain;
2295 if (fci)
2296 {
2297 wanted_type_ptr = (format_wanted_type *)
2298 pool_alloc (fwt_pool);
2299 arg_num++;
2300 wanted_type = *fci->types[length_chars_val].type;
2301 wanted_type_name = fci->types[length_chars_val].name;
2302 }
2303 }
2304 }
2305
2306 if (first_wanted_type != 0)
2307 check_format_types (first_wanted_type);
2308 }
2309
2310 if (format_chars - orig_format_chars != format_length)
2311 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format");
2312 if (info->first_arg_num != 0 && params != 0
2313 && has_operand_number <= 0)
2314 {
2315 res->number_other--;
2316 res->number_extra_args++;
2317 }
2318 if (has_operand_number > 0)
2319 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK);
2320}
2321
2322
2323/* Check the argument types from a single format conversion (possibly
2324 including width and precision arguments). */
2325static void
2326check_format_types (format_wanted_type *types)
2327{
2328 for (; types != 0; types = types->next)
2329 {
2330 tree cur_param;
2331 tree cur_type;
2332 tree orig_cur_type;
2333 tree wanted_type;
2334 int arg_num;
2335 int i;
2336 int char_type_flag;
2337
2338 wanted_type = types->wanted_type;
2339 arg_num = types->arg_num;
2340
2341 /* The following should not occur here. */
2342 gcc_assert (wanted_type);
2343 gcc_assert (wanted_type != void_type_node || types->pointer_count);
2344
2345 if (types->pointer_count == 0)
2346 wanted_type = lang_hooks.types.type_promotes_to (wanted_type);
2347
2348 wanted_type = TYPE_MAIN_VARIANT (wanted_type);
2349
2350 cur_param = types->param;
2351 if (!cur_param)
2352 {
2353 format_type_warning (types, wanted_type, NULL);
2354 continue;
2355 }
2356
2357 cur_type = TREE_TYPE (cur_param);
2358 if (cur_type == error_mark_node)
2359 continue;
2360 orig_cur_type = cur_type;
2361 char_type_flag = 0;
2362
2363 STRIP_NOPS (cur_param);
2364
2365 /* Check the types of any additional pointer arguments
2366 that precede the "real" argument. */
2367 for (i = 0; i < types->pointer_count; ++i)
2368 {
2369 if (TREE_CODE (cur_type) == POINTER_TYPE)
2370 {
2371 cur_type = TREE_TYPE (cur_type);
2372 if (cur_type == error_mark_node)
2373 break;
2374
2375 /* Check for writing through a NULL pointer. */
2376 if (types->writing_in_flag
2377 && i == 0
2378 && cur_param != 0
2379 && integer_zerop (cur_param))
2380 warning (OPT_Wformat, "writing through null pointer "
2381 "(argument %d)", arg_num);
2382
2383 /* Check for reading through a NULL pointer. */
2384 if (types->reading_from_flag
2385 && i == 0
2386 && cur_param != 0
2387 && integer_zerop (cur_param))
2388 warning (OPT_Wformat, "reading through null pointer "
2389 "(argument %d)", arg_num);
2390
2391 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2392 cur_param = TREE_OPERAND (cur_param, 0);
2393 else
2394 cur_param = 0;
2395
2396 /* See if this is an attempt to write into a const type with
2397 scanf or with printf "%n". Note: the writing in happens
2398 at the first indirection only, if for example
2399 void * const * is passed to scanf %p; passing
2400 const void ** is simply passing an incompatible type. */
2401 if (types->writing_in_flag
2402 && i == 0
2403 && (TYPE_READONLY (cur_type)
2404 || (cur_param != 0
2405 && (CONSTANT_CLASS_P (cur_param)
2406 || (DECL_P (cur_param)
2407 && TREE_READONLY (cur_param))))))
2408 warning (OPT_Wformat, "writing into constant object "
2409 "(argument %d)", arg_num);
2410
2411 /* If there are extra type qualifiers beyond the first
2412 indirection, then this makes the types technically
2413 incompatible. */
2414 if (i > 0
2415 && pedantic
2416 && (TYPE_READONLY (cur_type)
2417 || TYPE_VOLATILE (cur_type)
2418 || TYPE_RESTRICT (cur_type)))
2419 warning (OPT_Wformat, "extra type qualifiers in format "
2420 "argument (argument %d)",
2421 arg_num);
2422
2423 }
2424 else
2425 {
2426 format_type_warning (types, wanted_type, orig_cur_type);
2427 break;
2428 }
2429 }
2430
2431 if (i < types->pointer_count)
2432 continue;
2433
2434 cur_type = TYPE_MAIN_VARIANT (cur_type);
2435
2436 /* Check whether the argument type is a character type. This leniency
2437 only applies to certain formats, flagged with 'c'.
2438 */
2439 if (types->char_lenient_flag)
2440 char_type_flag = (cur_type == char_type_node
2441 || cur_type == signed_char_type_node
2442 || cur_type == unsigned_char_type_node);
2443
2444 /* Check the type of the "real" argument, if there's a type we want. */
2445 if (lang_hooks.types_compatible_p (wanted_type, cur_type))
2446 continue;
2447 /* If we want 'void *', allow any pointer type.
2448 (Anything else would already have got a warning.)
2449 With -pedantic, only allow pointers to void and to character
2450 types. */
2451 if (wanted_type == void_type_node
2452 && (!pedantic || (i == 1 && char_type_flag)))
2453 continue;
2454 /* Don't warn about differences merely in signedness, unless
2455 -pedantic. With -pedantic, warn if the type is a pointer
2456 target and not a character type, and for character types at
2457 a second level of indirection. */
2458 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2459 && TREE_CODE (cur_type) == INTEGER_TYPE
2460 && (!pedantic || i == 0 || (i == 1 && char_type_flag))
2461 && (TYPE_UNSIGNED (wanted_type)
2462 ? wanted_type == c_common_unsigned_type (cur_type)
2463 : wanted_type == c_common_signed_type (cur_type)))
2464 continue;
2465 /* Likewise, "signed char", "unsigned char" and "char" are
2466 equivalent but the above test won't consider them equivalent. */
2467 if (wanted_type == char_type_node
2468 && (!pedantic || i < 2)
2469 && char_type_flag)
2470 continue;
2471 if (types->scalar_identity_flag
2472 && (TREE_CODE (cur_type) == TREE_CODE (wanted_type)
2473 || (INTEGRAL_TYPE_P (cur_type)
2474 && INTEGRAL_TYPE_P (wanted_type)))
2475 && TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type))
2476 continue;
2477 /* Now we have a type mismatch. */
2478 format_type_warning (types, wanted_type, orig_cur_type);
2479 }
2480}
2481
2482
2483/* Give a warning about a format argument of different type from that
2484 expected. WANTED_TYPE is the type the argument should have, possibly
2485 stripped of pointer dereferences. The description (such as "field
2486 precision"), the placement in the format string, a possibly more
2487 friendly name of WANTED_TYPE, and the number of pointer dereferences
2488 are taken from TYPE. ARG_TYPE is the type of the actual argument,
2489 or NULL if it is missing. */
2490static void
2491format_type_warning (format_wanted_type *type, tree wanted_type, tree arg_type)
2492{
2493 int kind = type->kind;
2494 const char *wanted_type_name = type->wanted_type_name;
2495 const char *format_start = type->format_start;
2496 int format_length = type->format_length;
2497 int pointer_count = type->pointer_count;
2498 int arg_num = type->arg_num;
2499
2500 char *p;
2501 /* If ARG_TYPE is a typedef with a misleading name (for example,
2502 size_t but not the standard size_t expected by printf %zu), avoid
2503 printing the typedef name. */
2504 if (wanted_type_name
2505 && arg_type
2506 && TYPE_NAME (arg_type)
2507 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL
2508 && DECL_NAME (TYPE_NAME (arg_type))
2509 && !strcmp (wanted_type_name,
2510 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2)))
2511 arg_type = TYPE_MAIN_VARIANT (arg_type);
2512 /* The format type and name exclude any '*' for pointers, so those
2513 must be formatted manually. For all the types we currently have,
2514 this is adequate, but formats taking pointers to functions or
2515 arrays would require the full type to be built up in order to
2516 print it with %T. */
2517 p = (char *) alloca (pointer_count + 2);
2518 if (pointer_count == 0)
2519 p[0] = 0;
2520 else if (c_dialect_cxx ())
2521 {
2522 memset (p, '*', pointer_count);
2523 p[pointer_count] = 0;
2524 }
2525 else
2526 {
2527 p[0] = ' ';
2528 memset (p + 1, '*', pointer_count);
2529 p[pointer_count + 1] = 0;
2530 }
2531
2532 if (wanted_type_name)
2533 {
2534 if (arg_type)
2535 warning (OPT_Wformat, "%s %<%s%.*s%> expects argument of type %<%s%s%>, "
2536 "but argument %d has type %qT",
2537 gettext (kind_descriptions[kind]),
2538 (kind == CF_KIND_FORMAT ? "%" : ""),
2539 format_length, format_start,
2540 wanted_type_name, p, arg_num, arg_type);
2541 else
2542 warning (OPT_Wformat, "%s %<%s%.*s%> expects a matching %<%s%s%> argument",
2543 gettext (kind_descriptions[kind]),
2544 (kind == CF_KIND_FORMAT ? "%" : ""),
2545 format_length, format_start, wanted_type_name, p);
2546 }
2547 else
2548 {
2549 if (arg_type)
2550 warning (OPT_Wformat, "%s %<%s%.*s%> expects argument of type %<%T%s%>, "
2551 "but argument %d has type %qT",
2552 gettext (kind_descriptions[kind]),
2553 (kind == CF_KIND_FORMAT ? "%" : ""),
2554 format_length, format_start,
2555 wanted_type, p, arg_num, arg_type);
2556 else
2557 warning (OPT_Wformat, "%s %<%s%.*s%> expects a matching %<%T%s%> argument",
2558 gettext (kind_descriptions[kind]),
2559 (kind == CF_KIND_FORMAT ? "%" : ""),
2560 format_length, format_start, wanted_type, p);
2561 }
2562}
2563
2564
2565/* Given a format_char_info array FCI, and a character C, this function
2566 returns the index into the conversion_specs where that specifier's
2567 data is located. The character must exist. */
2568static unsigned int
2569find_char_info_specifier_index (const format_char_info *fci, int c)
2570{
2571 unsigned i;
2572
2573 for (i = 0; fci->format_chars; i++, fci++)
2574 if (strchr (fci->format_chars, c))
2575 return i;
2576
2577 /* We shouldn't be looking for a non-existent specifier. */
2578 gcc_unreachable ();
2579}
2580
2581/* Given a format_length_info array FLI, and a character C, this
2582 function returns the index into the conversion_specs where that
2583 modifier's data is located. The character must exist. */
2584static unsigned int
2585find_length_info_modifier_index (const format_length_info *fli, int c)
2586{
2587 unsigned i;
2588
2589 for (i = 0; fli->name; i++, fli++)
2590 if (strchr (fli->name, c))
2591 return i;
2592
2593 /* We shouldn't be looking for a non-existent modifier. */
2594 gcc_unreachable ();
2595}
2596
2597/* Determine the type of HOST_WIDE_INT in the code being compiled for
2598 use in GCC's __asm_fprintf__ custom format attribute. You must
2599 have set dynamic_format_types before calling this function. */
2600static void
2601init_dynamic_asm_fprintf_info (void)
2602{
2603 static tree hwi;
2604
2605 if (!hwi)
2606 {
2607 format_length_info *new_asm_fprintf_length_specs;
2608 unsigned int i;
2609
2610 /* Find the underlying type for HOST_WIDE_INT. For the %w
2611 length modifier to work, one must have issued: "typedef
2612 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2613 prior to using that modifier. */
2614 hwi = maybe_get_identifier ("__gcc_host_wide_int__");
2615 if (!hwi)
2616 {
2617 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2618 return;
2619 }
2620 hwi = identifier_global_value (hwi);
2621 if (!hwi || TREE_CODE (hwi) != TYPE_DECL)
2622 {
2623 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2624 return;
2625 }
2626 hwi = DECL_ORIGINAL_TYPE (hwi);
2627 gcc_assert (hwi);
2628 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node)
2629 {
2630 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2631 " or %<long long%>");
2632 return;
2633 }
2634
2635 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2636 new_asm_fprintf_length_specs = (format_length_info *)
2637 xmemdup (asm_fprintf_length_specs,
2638 sizeof (asm_fprintf_length_specs),
2639 sizeof (asm_fprintf_length_specs));
2640
2641 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2642 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w');
2643 if (hwi == long_integer_type_node)
2644 new_asm_fprintf_length_specs[i].index = FMT_LEN_l;
2645 else if (hwi == long_long_integer_type_node)
2646 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll;
2647 else
2648 gcc_unreachable ();
2649
2650 /* Assign the new data for use. */
2651 dynamic_format_types[asm_fprintf_format_type].length_char_specs =
2652 new_asm_fprintf_length_specs;
2653 }
2654}
2655
2656/* Determine the type of a "locus" in the code being compiled for use
2657 in GCC's __gcc_gfc__ custom format attribute. You must have set
2658 dynamic_format_types before calling this function. */
2659static void
2660init_dynamic_gfc_info (void)
2661{
2662 static tree locus;
2663
2664 if (!locus)
2665 {
2666 static format_char_info *gfc_fci;
2667
2668 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2669 must have declared 'locus' prior to using this attribute. If
2670 we haven't seen this declarations then you shouldn't use the
2671 specifier requiring that type. */
2672 if ((locus = maybe_get_identifier ("locus")))
2673 {
2674 locus = identifier_global_value (locus);
2675 if (locus)
2676 {
2677 if (TREE_CODE (locus) != TYPE_DECL
2678 || TREE_TYPE (locus) == error_mark_node)
2679 {
2680 error ("%<locus%> is not defined as a type");
2681 locus = 0;
2682 }
2683 else
2684 locus = TREE_TYPE (locus);
2685 }
2686 }
2687
2688 /* Assign the new data for use. */
2689
2690 /* Handle the __gcc_gfc__ format specifics. */
2691 if (!gfc_fci)
2692 dynamic_format_types[gcc_gfc_format_type].conversion_specs =
2693 gfc_fci = (format_char_info *)
2694 xmemdup (gcc_gfc_char_table,
2695 sizeof (gcc_gfc_char_table),
2696 sizeof (gcc_gfc_char_table));
2697 if (locus)
2698 {
2699 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L');
2700 gfc_fci[i].types[0].type = &locus;
2701 gfc_fci[i].pointer_count = 1;
2702 }
2703 }
2704}
2705
2706/* Determine the types of "tree" and "location_t" in the code being
2707 compiled for use in GCC's diagnostic custom format attributes. You
2708 must have set dynamic_format_types before calling this function. */
2709static void
2710init_dynamic_diag_info (void)
2711{
2712 static tree t, loc, hwi;
2713
2714 if (!loc || !t || !hwi)
2715 {
2716 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci;
2717 static format_length_info *diag_ls;
2718 unsigned int i;
2719
2720 /* For the GCC-diagnostics custom format specifiers to work, one
2721 must have declared 'tree' and/or 'location_t' prior to using
2722 those attributes. If we haven't seen these declarations then
2723 you shouldn't use the specifiers requiring these types.
2724 However we don't force a hard ICE because we may see only one
2725 or the other type. */
2726 if ((loc = maybe_get_identifier ("location_t")))
2727 {
2728 loc = identifier_global_value (loc);
2729 if (loc)
2730 {
2731 if (TREE_CODE (loc) != TYPE_DECL)
2732 {
2733 error ("%<location_t%> is not defined as a type");
2734 loc = 0;
2735 }
2736 else
2737 loc = TREE_TYPE (loc);
2738 }
2739 }
2740
2741 /* We need to grab the underlying 'union tree_node' so peek into
2742 an extra type level. */
2743 if ((t = maybe_get_identifier ("tree")))
2744 {
2745 t = identifier_global_value (t);
2746 if (t)
2747 {
2748 if (TREE_CODE (t) != TYPE_DECL)
2749 {
2750 error ("%<tree%> is not defined as a type");
2751 t = 0;
2752 }
2753 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE)
2754 {
2755 error ("%<tree%> is not defined as a pointer type");
2756 t = 0;
2757 }
2758 else
2759 t = TREE_TYPE (TREE_TYPE (t));
2760 }
2761 }
2762
2763 /* Find the underlying type for HOST_WIDE_INT. For the %w
2764 length modifier to work, one must have issued: "typedef
2765 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2766 prior to using that modifier. */
2767 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__")))
2768 {
2769 hwi = identifier_global_value (hwi);
2770 if (hwi)
2771 {
2772 if (TREE_CODE (hwi) != TYPE_DECL)
2773 {
2774 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2775 hwi = 0;
2776 }
2777 else
2778 {
2779 hwi = DECL_ORIGINAL_TYPE (hwi);
2780 gcc_assert (hwi);
2781 if (hwi != long_integer_type_node
2782 && hwi != long_long_integer_type_node)
2783 {
2784 error ("%<__gcc_host_wide_int__%> is not defined"
2785 " as %<long%> or %<long long%>");
2786 hwi = 0;
2787 }
2788 }
2789 }
2790 }
2791
2792 /* Assign the new data for use. */
2793
2794 /* All the GCC diag formats use the same length specs. */
2795 if (!diag_ls)
2796 dynamic_format_types[gcc_diag_format_type].length_char_specs =
2797 dynamic_format_types[gcc_tdiag_format_type].length_char_specs =
2798 dynamic_format_types[gcc_cdiag_format_type].length_char_specs =
2799 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs =
2800 diag_ls = (format_length_info *)
2801 xmemdup (gcc_diag_length_specs,
2802 sizeof (gcc_diag_length_specs),
2803 sizeof (gcc_diag_length_specs));
2804 if (hwi)
2805 {
2806 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2807 i = find_length_info_modifier_index (diag_ls, 'w');
2808 if (hwi == long_integer_type_node)
2809 diag_ls[i].index = FMT_LEN_l;
2810 else if (hwi == long_long_integer_type_node)
2811 diag_ls[i].index = FMT_LEN_ll;
2812 else
2813 gcc_unreachable ();
2814 }
2815
2816 /* Handle the __gcc_diag__ format specifics. */
2817 if (!diag_fci)
2818 dynamic_format_types[gcc_diag_format_type].conversion_specs =
2819 diag_fci = (format_char_info *)
2820 xmemdup (gcc_diag_char_table,
2821 sizeof (gcc_diag_char_table),
2822 sizeof (gcc_diag_char_table));
2823 if (t)
2824 {
2825 i = find_char_info_specifier_index (diag_fci, 'K');
2826 diag_fci[i].types[0].type = &t;
2827 diag_fci[i].pointer_count = 1;
2828 }
2829
2830 /* Handle the __gcc_tdiag__ format specifics. */
2831 if (!tdiag_fci)
2832 dynamic_format_types[gcc_tdiag_format_type].conversion_specs =
2833 tdiag_fci = (format_char_info *)
2834 xmemdup (gcc_tdiag_char_table,
2835 sizeof (gcc_tdiag_char_table),
2836 sizeof (gcc_tdiag_char_table));
2837 if (t)
2838 {
2839 /* All specifiers taking a tree share the same struct. */
2840 i = find_char_info_specifier_index (tdiag_fci, 'D');
2841 tdiag_fci[i].types[0].type = &t;
2842 tdiag_fci[i].pointer_count = 1;
2843 i = find_char_info_specifier_index (tdiag_fci, 'K');
2844 tdiag_fci[i].types[0].type = &t;
2845 tdiag_fci[i].pointer_count = 1;
2846 }
2847
2848 /* Handle the __gcc_cdiag__ format specifics. */
2849 if (!cdiag_fci)
2850 dynamic_format_types[gcc_cdiag_format_type].conversion_specs =
2851 cdiag_fci = (format_char_info *)
2852 xmemdup (gcc_cdiag_char_table,
2853 sizeof (gcc_cdiag_char_table),
2854 sizeof (gcc_cdiag_char_table));
2855 if (t)
2856 {
2857 /* All specifiers taking a tree share the same struct. */
2858 i = find_char_info_specifier_index (cdiag_fci, 'D');
2859 cdiag_fci[i].types[0].type = &t;
2860 cdiag_fci[i].pointer_count = 1;
2861 i = find_char_info_specifier_index (cdiag_fci, 'K');
2862 cdiag_fci[i].types[0].type = &t;
2863 cdiag_fci[i].pointer_count = 1;
2864 }
2865
2866 /* Handle the __gcc_cxxdiag__ format specifics. */
2867 if (!cxxdiag_fci)
2868 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs =
2869 cxxdiag_fci = (format_char_info *)
2870 xmemdup (gcc_cxxdiag_char_table,
2871 sizeof (gcc_cxxdiag_char_table),
2872 sizeof (gcc_cxxdiag_char_table));
2873 if (t)
2874 {
2875 /* All specifiers taking a tree share the same struct. */
2876 i = find_char_info_specifier_index (cxxdiag_fci, 'D');
2877 cxxdiag_fci[i].types[0].type = &t;
2878 cxxdiag_fci[i].pointer_count = 1;
2879 i = find_char_info_specifier_index (cxxdiag_fci, 'K');
2880 cxxdiag_fci[i].types[0].type = &t;
2881 cxxdiag_fci[i].pointer_count = 1;
2882 }
2883 }
2884}
2885
2886#ifdef TARGET_FORMAT_TYPES
2887extern const format_kind_info TARGET_FORMAT_TYPES[];
2888#endif
2889
2890#ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2891extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[];
2892#endif
2893#ifdef TARGET_OVERRIDES_FORMAT_INIT
2894 extern void TARGET_OVERRIDES_FORMAT_INIT (void);
2895#endif
2896
2897/* Attributes such as "printf" are equivalent to those such as
2898 "gnu_printf" unless this is overridden by a target. */
2899static const target_ovr_attr gnu_target_overrides_format_attributes[] =
2900{
2901 { "gnu_printf", "printf" },
2902 { "gnu_scanf", "scanf" },
2903 { "gnu_strftime", "strftime" },
2904 { "gnu_strfmon", "strfmon" },
2905 { NULL, NULL }
2906};
2907
2908/* Translate to unified attribute name. This is used in decode_format_type and
2909 decode_format_attr. In attr_name the user specified argument is passed. It
2910 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2911 or the attr_name passed to this function, if there is no matching entry. */
2912static const char *
2913convert_format_name_to_system_name (const char *attr_name)
2914{
2915 int i;
2916
2917 if (attr_name == NULL || *attr_name == 0
2918 || strncmp (attr_name, "gcc_", 4) == 0)
2919 return attr_name;
2920#ifdef TARGET_OVERRIDES_FORMAT_INIT
2921 TARGET_OVERRIDES_FORMAT_INIT ();
2922#endif
2923
2924#ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES
2925 /* Check if format attribute is overridden by target. */
2926 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL
2927 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0)
2928 {
2929 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i)
2930 {
2931 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src,
2932 attr_name))
2933 return attr_name;
2934 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst,
2935 attr_name))
2936 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src;
2937 }
2938 }
2939#endif
2940 /* Otherwise default to gnu format. */
2941 for (i = 0;
2942 gnu_target_overrides_format_attributes[i].named_attr_src != NULL;
2943 ++i)
2944 {
2945 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src,
2946 attr_name))
2947 return attr_name;
2948 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst,
2949 attr_name))
2950 return gnu_target_overrides_format_attributes[i].named_attr_src;
2951 }
2952
2953 return attr_name;
2954}
2955
2956/* Return true if TATTR_NAME and ATTR_NAME are the same format attribute,
2957 counting "name" and "__name__" as the same, false otherwise. */
2958static bool
2959cmp_attribs (const char *tattr_name, const char *attr_name)
2960{
2961 int alen = strlen (attr_name);
2962 int slen = (tattr_name ? strlen (tattr_name) : 0);
2963 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_'
2964 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_')
2965 {
2966 attr_name += 2;
2967 alen -= 4;
2968 }
2969 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0)
2970 return false;
2971 return true;
2972}
2973
2974/* Handle a "format" attribute; arguments as in
2975 struct attribute_spec.handler. */
2976tree
2977handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args,
2978 int flags, bool *no_add_attrs)
2979{
2980 tree type = *node;
2981 function_format_info info;
2982
2983#ifdef TARGET_FORMAT_TYPES
2984 /* If the target provides additional format types, we need to
2985 add them to FORMAT_TYPES at first use. */
2986 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types)
2987 {
2988 dynamic_format_types = XNEWVEC (format_kind_info,
2989 n_format_types + TARGET_N_FORMAT_TYPES);
2990 memcpy (dynamic_format_types, format_types_orig,
2991 sizeof (format_types_orig));
2992 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES,
2993 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0]));
2994
2995 format_types = dynamic_format_types;
2996 /* Provide a reference for the first potential external type. */
2997 first_target_format_type = n_format_types;
2998 n_format_types += TARGET_N_FORMAT_TYPES;
2999 }
3000#endif
3001
3002 if (!decode_format_attr (args, &info, 0))
3003 {
3004 *no_add_attrs = true;
3005 return NULL_TREE;
3006 }
3007
3008 if (prototype_p (type))
3009 {
3010 if (!check_format_string (type, info.format_num, flags,
3011 no_add_attrs, info.format_type))
3012 return NULL_TREE;
3013
3014 if (info.first_arg_num != 0)
3015 {
3016 unsigned HOST_WIDE_INT arg_num = 1;
3017 function_args_iterator iter;
3018 tree arg_type;
3019
3020 /* Verify that first_arg_num points to the last arg,
3021 the ... */
3022 FOREACH_FUNCTION_ARGS (type, arg_type, iter)
3023 arg_num++;
3024
3025 if (arg_num != info.first_arg_num)
3026 {
3027 if (!(flags & (int) ATTR_FLAG_BUILT_IN))
3028 error ("args to be formatted is not %<...%>");
3029 *no_add_attrs = true;
3030 return NULL_TREE;
3031 }
3032 }
3033 }
3034
3035 /* Check if this is a strftime variant. Just for this variant
3036 FMT_FLAG_ARG_CONVERT is not set. */
3037 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0
3038 && info.first_arg_num != 0)
3039 {
3040 error ("strftime formats cannot format arguments");
3041 *no_add_attrs = true;
3042 return NULL_TREE;
3043 }
3044
3045 /* If this is a custom GCC-internal format type, we have to
3046 initialize certain bits at runtime. */
3047 if (info.format_type == asm_fprintf_format_type
3048 || info.format_type == gcc_gfc_format_type
3049 || info.format_type == gcc_diag_format_type
3050 || info.format_type == gcc_tdiag_format_type
3051 || info.format_type == gcc_cdiag_format_type
3052 || info.format_type == gcc_cxxdiag_format_type)
3053 {
3054 /* Our first time through, we have to make sure that our
3055 format_type data is allocated dynamically and is modifiable. */
3056 if (!dynamic_format_types)
3057 format_types = dynamic_format_types = (format_kind_info *)
3058 xmemdup (format_types_orig, sizeof (format_types_orig),
3059 sizeof (format_types_orig));
3060
3061 /* If this is format __asm_fprintf__, we have to initialize
3062 GCC's notion of HOST_WIDE_INT for checking %wd. */
3063 if (info.format_type == asm_fprintf_format_type)
3064 init_dynamic_asm_fprintf_info ();
3065 /* If this is format __gcc_gfc__, we have to initialize GCC's
3066 notion of 'locus' at runtime for %L. */
3067 else if (info.format_type == gcc_gfc_format_type)
3068 init_dynamic_gfc_info ();
3069 /* If this is one of the diagnostic attributes, then we have to
3070 initialize 'location_t' and 'tree' at runtime. */
3071 else if (info.format_type == gcc_diag_format_type
3072 || info.format_type == gcc_tdiag_format_type
3073 || info.format_type == gcc_cdiag_format_type
3074 || info.format_type == gcc_cxxdiag_format_type)
3075 init_dynamic_diag_info ();
3076 else
3077 gcc_unreachable ();
3078 }
3079
3080 return NULL_TREE;
3081}