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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
30 #include "diagnostic.h"
31 #include "langhooks.h"
33 #include "alloc-pool.h"
35 /* Set format warning options according to a -Wformat=n option. */
38 set_Wformat (int setting
)
40 warn_format
= setting
;
41 warn_format_extra_args
= setting
;
42 warn_format_zero_length
= setting
;
43 warn_format_contains_nul
= setting
;
46 warn_format_nonliteral
= setting
;
47 warn_format_security
= setting
;
48 warn_format_y2k
= setting
;
50 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */
52 warn_nonnull
= setting
;
56 /* Handle attributes associated with format checking. */
58 /* This must be in the same order as format_types, except for
59 format_type_error. Target-specific format types do not have
60 matching enum values. */
61 enum format_type
{ printf_format_type
, asm_fprintf_format_type
,
62 gcc_diag_format_type
, gcc_tdiag_format_type
,
63 gcc_cdiag_format_type
,
64 gcc_cxxdiag_format_type
, gcc_gfc_format_type
,
65 scanf_format_type
, strftime_format_type
,
66 strfmon_format_type
, format_type_error
= -1};
68 typedef struct function_format_info
70 int format_type
; /* type of format (printf, scanf, etc.) */
71 unsigned HOST_WIDE_INT format_num
; /* number of format argument */
72 unsigned HOST_WIDE_INT first_arg_num
; /* number of first arg (zero for varargs) */
73 } function_format_info
;
75 static bool decode_format_attr (tree
, function_format_info
*, int);
76 static int decode_format_type (const char *);
78 static bool check_format_string (tree argument
,
79 unsigned HOST_WIDE_INT format_num
,
80 int flags
, bool *no_add_attrs
);
81 static bool get_constant (tree expr
, unsigned HOST_WIDE_INT
*value
,
85 /* Handle a "format_arg" attribute; arguments as in
86 struct attribute_spec.handler. */
88 handle_format_arg_attribute (tree
*node
, tree
ARG_UNUSED (name
),
89 tree args
, int flags
, bool *no_add_attrs
)
92 tree format_num_expr
= TREE_VALUE (args
);
93 unsigned HOST_WIDE_INT format_num
= 0;
96 if (!get_constant (format_num_expr
, &format_num
, 0))
98 error ("format string has invalid operand number");
103 argument
= TYPE_ARG_TYPES (type
);
106 if (!check_format_string (argument
, format_num
, flags
, no_add_attrs
))
110 if (TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
111 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
114 if (!(flags
& (int) ATTR_FLAG_BUILT_IN
))
115 error ("function does not return string type");
116 *no_add_attrs
= true;
123 /* Verify that the format_num argument is actually a string, in case
124 the format attribute is in error. */
126 check_format_string (tree argument
, unsigned HOST_WIDE_INT format_num
,
127 int flags
, bool *no_add_attrs
)
129 unsigned HOST_WIDE_INT i
;
131 for (i
= 1; i
!= format_num
; i
++)
135 argument
= TREE_CHAIN (argument
);
139 || TREE_CODE (TREE_VALUE (argument
)) != POINTER_TYPE
140 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument
)))
143 if (!(flags
& (int) ATTR_FLAG_BUILT_IN
))
144 error ("format string argument not a string type");
145 *no_add_attrs
= true;
152 /* Verify EXPR is a constant, and store its value.
153 If validated_p is true there should be no errors.
154 Returns true on success, false otherwise. */
156 get_constant (tree expr
, unsigned HOST_WIDE_INT
*value
, int validated_p
)
158 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_INT_CST_HIGH (expr
) != 0)
160 gcc_assert (!validated_p
);
164 *value
= TREE_INT_CST_LOW (expr
);
169 /* Decode the arguments to a "format" attribute into a
170 function_format_info structure. It is already known that the list
171 is of the right length. If VALIDATED_P is true, then these
172 attributes have already been validated and must not be erroneous;
173 if false, it will give an error message. Returns true if the
174 attributes are successfully decoded, false otherwise. */
177 decode_format_attr (tree args
, function_format_info
*info
, int validated_p
)
179 tree format_type_id
= TREE_VALUE (args
);
180 tree format_num_expr
= TREE_VALUE (TREE_CHAIN (args
));
181 tree first_arg_num_expr
182 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args
)));
184 if (TREE_CODE (format_type_id
) != IDENTIFIER_NODE
)
186 gcc_assert (!validated_p
);
187 error ("unrecognized format specifier");
192 const char *p
= IDENTIFIER_POINTER (format_type_id
);
194 info
->format_type
= decode_format_type (p
);
196 if (info
->format_type
== format_type_error
)
198 gcc_assert (!validated_p
);
199 warning (OPT_Wformat
, "%qE is an unrecognized format function type",
205 if (!get_constant (format_num_expr
, &info
->format_num
, validated_p
))
207 error ("format string has invalid operand number");
211 if (!get_constant (first_arg_num_expr
, &info
->first_arg_num
, validated_p
))
213 error ("%<...%> has invalid operand number");
217 if (info
->first_arg_num
!= 0 && info
->first_arg_num
<= info
->format_num
)
219 gcc_assert (!validated_p
);
220 error ("format string argument follows the args to be formatted");
227 /* Check a call to a format function against a parameter list. */
229 /* The C standard version C++ is treated as equivalent to
230 or inheriting from, for the purpose of format features supported. */
231 #define CPLUSPLUS_STD_VER STD_C94
232 /* The C standard version we are checking formats against when pedantic. */
233 #define C_STD_VER ((int) (c_dialect_cxx () \
234 ? CPLUSPLUS_STD_VER \
237 : (flag_isoc94 ? STD_C94 : STD_C89))))
238 /* The name to give to the standard version we are warning about when
239 pedantic. FEATURE_VER is the version in which the feature warned out
240 appeared, which is higher than C_STD_VER. */
241 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \
243 : ((FEATURE_VER) == STD_EXT \
246 /* Adjust a C standard version, which may be STD_C9L, to account for
247 -Wno-long-long. Returns other standard versions unchanged. */
248 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \
249 ? (warn_long_long ? STD_C99 : STD_C89) \
252 /* Structure describing details of a type expected in format checking,
253 and the type to check against it. */
254 typedef struct format_wanted_type
256 /* The type wanted. */
258 /* The name of this type to use in diagnostics. */
259 const char *wanted_type_name
;
260 /* The level of indirection through pointers at which this type occurs. */
262 /* Whether, when pointer_count is 1, to allow any character type when
263 pedantic, rather than just the character or void type specified. */
264 int char_lenient_flag
;
265 /* Whether the argument, dereferenced once, is written into and so the
266 argument must not be a pointer to a const-qualified type. */
268 /* Whether the argument, dereferenced once, is read from and so
269 must not be a NULL pointer. */
270 int reading_from_flag
;
271 /* If warnings should be of the form "field precision should have
272 type 'int'", the name to use (in this case "field precision"),
273 otherwise NULL, for "format expects type 'long'" type
276 /* The actual parameter to check against the wanted type. */
278 /* The argument number of that parameter. */
280 /* The next type to check for this format conversion, or NULL if none. */
281 struct format_wanted_type
*next
;
282 } format_wanted_type
;
285 static const format_length_info printf_length_specs
[] =
287 { "h", FMT_LEN_h
, STD_C89
, "hh", FMT_LEN_hh
, STD_C99
},
288 { "l", FMT_LEN_l
, STD_C89
, "ll", FMT_LEN_ll
, STD_C9L
},
289 { "q", FMT_LEN_ll
, STD_EXT
, NULL
, 0, 0 },
290 { "L", FMT_LEN_L
, STD_C89
, NULL
, 0, 0 },
291 { "z", FMT_LEN_z
, STD_C99
, NULL
, 0, 0 },
292 { "Z", FMT_LEN_z
, STD_EXT
, NULL
, 0, 0 },
293 { "t", FMT_LEN_t
, STD_C99
, NULL
, 0, 0 },
294 { "j", FMT_LEN_j
, STD_C99
, NULL
, 0, 0 },
295 { "H", FMT_LEN_H
, STD_EXT
, NULL
, 0, 0 },
296 { "D", FMT_LEN_D
, STD_EXT
, "DD", FMT_LEN_DD
, STD_EXT
},
297 { NULL
, 0, 0, NULL
, 0, 0 }
300 /* Length specifiers valid for asm_fprintf. */
301 static const format_length_info asm_fprintf_length_specs
[] =
303 { "l", FMT_LEN_l
, STD_C89
, "ll", FMT_LEN_ll
, STD_C89
},
304 { "w", FMT_LEN_none
, STD_C89
, NULL
, 0, 0 },
305 { NULL
, 0, 0, NULL
, 0, 0 }
308 /* Length specifiers valid for GCC diagnostics. */
309 static const format_length_info gcc_diag_length_specs
[] =
311 { "l", FMT_LEN_l
, STD_C89
, "ll", FMT_LEN_ll
, STD_C89
},
312 { "w", FMT_LEN_none
, STD_C89
, NULL
, 0, 0 },
313 { NULL
, 0, 0, NULL
, 0, 0 }
316 /* The custom diagnostics all accept the same length specifiers. */
317 #define gcc_tdiag_length_specs gcc_diag_length_specs
318 #define gcc_cdiag_length_specs gcc_diag_length_specs
319 #define gcc_cxxdiag_length_specs gcc_diag_length_specs
321 /* This differs from printf_length_specs only in that "Z" is not accepted. */
322 static const format_length_info scanf_length_specs
[] =
324 { "h", FMT_LEN_h
, STD_C89
, "hh", FMT_LEN_hh
, STD_C99
},
325 { "l", FMT_LEN_l
, STD_C89
, "ll", FMT_LEN_ll
, STD_C9L
},
326 { "q", FMT_LEN_ll
, STD_EXT
, NULL
, 0, 0 },
327 { "L", FMT_LEN_L
, STD_C89
, NULL
, 0, 0 },
328 { "z", FMT_LEN_z
, STD_C99
, NULL
, 0, 0 },
329 { "t", FMT_LEN_t
, STD_C99
, NULL
, 0, 0 },
330 { "j", FMT_LEN_j
, STD_C99
, NULL
, 0, 0 },
331 { "H", FMT_LEN_H
, STD_EXT
, NULL
, 0, 0 },
332 { "D", FMT_LEN_D
, STD_EXT
, "DD", FMT_LEN_DD
, STD_EXT
},
333 { NULL
, 0, 0, NULL
, 0, 0 }
337 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings
338 make no sense for a format type not part of any C standard version. */
339 static const format_length_info strfmon_length_specs
[] =
341 /* A GNU extension. */
342 { "L", FMT_LEN_L
, STD_C89
, NULL
, 0, 0 },
343 { NULL
, 0, 0, NULL
, 0, 0 }
347 /* For now, the Fortran front-end routines only use l as length modifier. */
348 static const format_length_info gcc_gfc_length_specs
[] =
350 { "l", FMT_LEN_l
, STD_C89
, NULL
, 0, 0 },
351 { NULL
, 0, 0, NULL
, 0, 0 }
355 static const format_flag_spec printf_flag_specs
[] =
357 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89
},
358 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89
},
359 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89
},
360 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89
},
361 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89
},
362 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT
},
363 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT
},
364 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89
},
365 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89
},
366 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89
},
367 { 0, 0, 0, NULL
, NULL
, 0 }
371 static const format_flag_pair printf_flag_pairs
[] =
375 { '0', 'p', 1, 'i' },
379 static const format_flag_spec asm_fprintf_flag_specs
[] =
381 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89
},
382 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89
},
383 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89
},
384 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89
},
385 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89
},
386 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89
},
387 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89
},
388 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89
},
389 { 0, 0, 0, NULL
, NULL
, 0 }
392 static const format_flag_pair asm_fprintf_flag_pairs
[] =
396 { '0', 'p', 1, 'i' },
400 static const format_flag_pair gcc_diag_flag_pairs
[] =
405 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs
406 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs
407 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs
409 static const format_flag_pair gcc_gfc_flag_pairs
[] =
414 static const format_flag_spec gcc_diag_flag_specs
[] =
416 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89
},
417 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89
},
418 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89
},
419 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89
},
420 { 0, 0, 0, NULL
, NULL
, 0 }
423 #define gcc_tdiag_flag_specs gcc_diag_flag_specs
424 #define gcc_cdiag_flag_specs gcc_diag_flag_specs
426 static const format_flag_spec gcc_cxxdiag_flag_specs
[] =
428 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89
},
429 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89
},
430 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89
},
431 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89
},
432 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89
},
433 { 0, 0, 0, NULL
, NULL
, 0 }
436 static const format_flag_spec scanf_flag_specs
[] =
438 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89
},
439 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT
},
440 { 'm', 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT
},
441 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89
},
442 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89
},
443 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT
},
444 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT
},
445 { 0, 0, 0, NULL
, NULL
, 0 }
449 static const format_flag_pair scanf_flag_pairs
[] =
457 static const format_flag_spec strftime_flag_specs
[] =
459 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT
},
460 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT
},
461 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT
},
462 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT
},
463 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT
},
464 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT
},
465 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99
},
466 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99
},
467 { 'O', 'o', 0, NULL
, N_("the 'O' modifier"), STD_EXT
},
468 { 0, 0, 0, NULL
, NULL
, 0 }
472 static const format_flag_pair strftime_flag_pairs
[] =
483 static const format_flag_spec strfmon_flag_specs
[] =
485 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89
},
486 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89
},
487 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89
},
488 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89
},
489 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89
},
490 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89
},
491 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89
},
492 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89
},
493 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89
},
494 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89
},
495 { 0, 0, 0, NULL
, NULL
, 0 }
498 static const format_flag_pair strfmon_flag_pairs
[] =
505 static const format_char_info print_char_table
[] =
507 /* C89 conversion specifiers. */
508 { "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
},
509 { "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
},
510 { "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
},
511 { "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
},
512 { "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
},
513 { "c", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, T94_WI
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-w", "", NULL
},
514 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, T94_W
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp", "cR", NULL
},
515 { "p", 1, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-w", "c", NULL
},
516 { "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
},
517 /* C99 conversion specifiers. */
518 { "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
},
519 { "aA", 0, STD_C99
, { T99_D
, BADLEN
, BADLEN
, T99_D
, BADLEN
, T99_LD
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp0 +#", "", NULL
},
520 /* X/Open conversion specifiers. */
521 { "C", 0, STD_EXT
, { TEX_WI
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-w", "", NULL
},
522 { "S", 1, STD_EXT
, { TEX_W
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp", "R", NULL
},
523 /* GNU conversion specifiers. */
524 { "m", 0, STD_EXT
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp", "", NULL
},
525 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
528 static const format_char_info asm_fprintf_char_table
[] =
530 /* C89 conversion specifiers. */
531 { "di", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, T89_L
, T9L_LL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp0 +", "i", NULL
},
532 { "oxX", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp0#", "i", NULL
},
533 { "u", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp0", "i", NULL
},
534 { "c", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-w", "", NULL
},
535 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "-wp", "cR", NULL
},
537 /* asm_fprintf conversion specifiers. */
538 { "O", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
539 { "R", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
540 { "I", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
541 { "L", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
542 { "U", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
543 { "r", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "", "", NULL
},
544 { "@", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
545 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
548 static const format_char_info gcc_diag_char_table
[] =
550 /* C89 conversion specifiers. */
551 { "di", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, T89_L
, T9L_LL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
552 { "ox", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
553 { "u", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
554 { "c", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
555 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "pq", "cR", NULL
},
556 { "p", 1, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "c", NULL
},
558 /* Custom conversion specifiers. */
560 /* %H will require "location_t" at runtime. */
561 { "H", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
563 /* These will require a "tree" at runtime. */
564 { "J", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
566 { "<>'", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
567 { "m", 0, STD_C89
, NOARGUMENTS
, "q", "", NULL
},
568 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
571 static const format_char_info gcc_tdiag_char_table
[] =
573 /* C89 conversion specifiers. */
574 { "di", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, T89_L
, T9L_LL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
575 { "ox", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
576 { "u", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
577 { "c", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
578 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "pq", "cR", NULL
},
579 { "p", 1, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "c", NULL
},
581 /* Custom conversion specifiers. */
583 /* %H will require "location_t" at runtime. */
584 { "H", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
586 /* These will require a "tree" at runtime. */
587 { "DFJT", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q+", "", NULL
},
589 { "<>'", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
590 { "m", 0, STD_C89
, NOARGUMENTS
, "q", "", NULL
},
591 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
594 static const format_char_info gcc_cdiag_char_table
[] =
596 /* C89 conversion specifiers. */
597 { "di", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, T89_L
, T9L_LL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
598 { "ox", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
599 { "u", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
600 { "c", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
601 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "pq", "cR", NULL
},
602 { "p", 1, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "c", NULL
},
604 /* Custom conversion specifiers. */
606 /* %H will require "location_t" at runtime. */
607 { "H", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
609 /* These will require a "tree" at runtime. */
610 { "DEFJT", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q+", "", NULL
},
612 { "<>'", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
613 { "m", 0, STD_C89
, NOARGUMENTS
, "q", "", NULL
},
614 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
617 static const format_char_info gcc_cxxdiag_char_table
[] =
619 /* C89 conversion specifiers. */
620 { "di", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, T89_L
, T9L_LL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
621 { "ox", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
622 { "u", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, T9L_ULL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
623 { "c", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
624 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "pq", "cR", NULL
},
625 { "p", 1, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "c", NULL
},
627 /* Custom conversion specifiers. */
629 /* %H will require "location_t" at runtime. */
630 { "H", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
632 /* These will require a "tree" at runtime. */
633 { "ADEFJTV",0,STD_C89
,{ T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q+#", "", NULL
},
635 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */
636 { "CLOPQ",0,STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "q", "", NULL
},
638 { "<>'", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
639 { "m", 0, STD_C89
, NOARGUMENTS
, "q", "", NULL
},
640 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
643 static const format_char_info gcc_gfc_char_table
[] =
645 /* C89 conversion specifiers. */
646 { "di", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, T89_L
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "", "", NULL
},
647 { "u", 0, STD_C89
, { T89_UI
, BADLEN
, BADLEN
, T89_UL
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "", "", NULL
},
648 { "c", 0, STD_C89
, { T89_I
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "", "", NULL
},
649 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "", "cR", NULL
},
651 /* gfc conversion specifiers. */
653 { "C", 0, STD_C89
, NOARGUMENTS
, "", "", NULL
},
655 /* This will require a "locus" at runtime. */
656 { "L", 0, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "", "R", NULL
},
658 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
661 static const format_char_info scan_char_table
[] =
663 /* C89 conversion specifiers. */
664 { "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
},
665 { "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
},
666 { "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
},
667 { "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
},
668 { "c", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, T94_W
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "*mw", "cW", NULL
},
669 { "s", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, T94_W
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "*amw", "cW", NULL
},
670 { "[", 1, STD_C89
, { T89_C
, BADLEN
, BADLEN
, T94_W
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "*amw", "cW[", NULL
},
671 { "p", 2, STD_C89
, { T89_V
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "*w", "W", NULL
},
672 { "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
},
673 /* C99 conversion specifiers. */
674 { "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
},
675 { "aA", 1, STD_C99
, { T99_F
, BADLEN
, BADLEN
, T99_D
, BADLEN
, T99_LD
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "*w'", "W", NULL
},
676 /* X/Open conversion specifiers. */
677 { "C", 1, STD_EXT
, { TEX_W
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "*mw", "W", NULL
},
678 { "S", 1, STD_EXT
, { TEX_W
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "*amw", "W", NULL
},
679 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
682 static const format_char_info time_char_table
[] =
684 /* C89 conversion specifiers. */
685 { "ABZab", 0, STD_C89
, NOLENGTHS
, "^#", "", NULL
},
686 { "cx", 0, STD_C89
, NOLENGTHS
, "E", "3", NULL
},
687 { "HIMSUWdmw", 0, STD_C89
, NOLENGTHS
, "-_0Ow", "", NULL
},
688 { "j", 0, STD_C89
, NOLENGTHS
, "-_0Ow", "o", NULL
},
689 { "p", 0, STD_C89
, NOLENGTHS
, "#", "", NULL
},
690 { "X", 0, STD_C89
, NOLENGTHS
, "E", "", NULL
},
691 { "y", 0, STD_C89
, NOLENGTHS
, "EO-_0w", "4", NULL
},
692 { "Y", 0, STD_C89
, NOLENGTHS
, "-_0EOw", "o", NULL
},
693 { "%", 0, STD_C89
, NOLENGTHS
, "", "", NULL
},
694 /* C99 conversion specifiers. */
695 { "C", 0, STD_C99
, NOLENGTHS
, "-_0EOw", "o", NULL
},
696 { "D", 0, STD_C99
, NOLENGTHS
, "", "2", NULL
},
697 { "eVu", 0, STD_C99
, NOLENGTHS
, "-_0Ow", "", NULL
},
698 { "FRTnrt", 0, STD_C99
, NOLENGTHS
, "", "", NULL
},
699 { "g", 0, STD_C99
, NOLENGTHS
, "O-_0w", "2o", NULL
},
700 { "G", 0, STD_C99
, NOLENGTHS
, "-_0Ow", "o", NULL
},
701 { "h", 0, STD_C99
, NOLENGTHS
, "^#", "", NULL
},
702 { "z", 0, STD_C99
, NOLENGTHS
, "O", "o", NULL
},
703 /* GNU conversion specifiers. */
704 { "kls", 0, STD_EXT
, NOLENGTHS
, "-_0Ow", "", NULL
},
705 { "P", 0, STD_EXT
, NOLENGTHS
, "", "", NULL
},
706 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
709 static const format_char_info monetary_char_table
[] =
711 { "in", 0, STD_C89
, { T89_D
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, T89_LD
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
, BADLEN
}, "=^+(!-w#p", "", NULL
},
712 { NULL
, 0, 0, NOLENGTHS
, NULL
, NULL
, NULL
}
715 /* This must be in the same order as enum format_type. */
716 static const format_kind_info format_types_orig
[] =
718 { "printf", printf_length_specs
, print_char_table
, " +#0-'I", NULL
,
719 printf_flag_specs
, printf_flag_pairs
,
720 FMT_FLAG_ARG_CONVERT
|FMT_FLAG_DOLLAR_MULTIPLE
|FMT_FLAG_USE_DOLLAR
|FMT_FLAG_EMPTY_PREC_OK
,
721 'w', 0, 'p', 0, 'L', 0,
722 &integer_type_node
, &integer_type_node
724 { "asm_fprintf", asm_fprintf_length_specs
, asm_fprintf_char_table
, " +#0-", NULL
,
725 asm_fprintf_flag_specs
, asm_fprintf_flag_pairs
,
726 FMT_FLAG_ARG_CONVERT
|FMT_FLAG_EMPTY_PREC_OK
,
727 'w', 0, 'p', 0, 'L', 0,
730 { "gcc_diag", gcc_diag_length_specs
, gcc_diag_char_table
, "q+", NULL
,
731 gcc_diag_flag_specs
, gcc_diag_flag_pairs
,
732 FMT_FLAG_ARG_CONVERT
,
733 0, 0, 'p', 0, 'L', 0,
734 NULL
, &integer_type_node
736 { "gcc_tdiag", gcc_tdiag_length_specs
, gcc_tdiag_char_table
, "q+", NULL
,
737 gcc_tdiag_flag_specs
, gcc_tdiag_flag_pairs
,
738 FMT_FLAG_ARG_CONVERT
,
739 0, 0, 'p', 0, 'L', 0,
740 NULL
, &integer_type_node
742 { "gcc_cdiag", gcc_cdiag_length_specs
, gcc_cdiag_char_table
, "q+", NULL
,
743 gcc_cdiag_flag_specs
, gcc_cdiag_flag_pairs
,
744 FMT_FLAG_ARG_CONVERT
,
745 0, 0, 'p', 0, 'L', 0,
746 NULL
, &integer_type_node
748 { "gcc_cxxdiag", gcc_cxxdiag_length_specs
, gcc_cxxdiag_char_table
, "q+#", NULL
,
749 gcc_cxxdiag_flag_specs
, gcc_cxxdiag_flag_pairs
,
750 FMT_FLAG_ARG_CONVERT
,
751 0, 0, 'p', 0, 'L', 0,
752 NULL
, &integer_type_node
754 { "gcc_gfc", gcc_gfc_length_specs
, gcc_gfc_char_table
, "", NULL
,
755 NULL
, gcc_gfc_flag_pairs
,
756 FMT_FLAG_ARG_CONVERT
,
760 { "scanf", scanf_length_specs
, scan_char_table
, "*'I", NULL
,
761 scanf_flag_specs
, scanf_flag_pairs
,
762 FMT_FLAG_ARG_CONVERT
|FMT_FLAG_SCANF_A_KLUDGE
|FMT_FLAG_USE_DOLLAR
|FMT_FLAG_ZERO_WIDTH_BAD
|FMT_FLAG_DOLLAR_GAP_POINTER_OK
,
763 'w', 0, 0, '*', 'L', 'm',
766 { "strftime", NULL
, time_char_table
, "_-0^#", "EO",
767 strftime_flag_specs
, strftime_flag_pairs
,
768 FMT_FLAG_FANCY_PERCENT_OK
, 'w', 0, 0, 0, 0, 0,
771 { "strfmon", strfmon_length_specs
, monetary_char_table
, "=^+(!-", NULL
,
772 strfmon_flag_specs
, strfmon_flag_pairs
,
773 FMT_FLAG_ARG_CONVERT
, 'w', '#', 'p', 0, 'L', 0,
778 /* This layer of indirection allows GCC to reassign format_types with
779 new data if necessary, while still allowing the original data to be
781 static const format_kind_info
*format_types
= format_types_orig
;
782 /* We can modify this one. We also add target-specific format types
783 to the end of the array. */
784 static format_kind_info
*dynamic_format_types
;
786 static int n_format_types
= ARRAY_SIZE (format_types_orig
);
788 /* Structure detailing the results of checking a format function call
789 where the format expression may be a conditional expression with
790 many leaves resulting from nested conditional expressions. */
793 /* Number of leaves of the format argument that could not be checked
794 as they were not string literals. */
795 int number_non_literal
;
796 /* Number of leaves of the format argument that were null pointers or
797 string literals, but had extra format arguments. */
798 int number_extra_args
;
799 /* Number of leaves of the format argument that were null pointers or
800 string literals, but had extra format arguments and used $ operand
802 int number_dollar_extra_args
;
803 /* Number of leaves of the format argument that were wide string
806 /* Number of leaves of the format argument that were empty strings. */
808 /* Number of leaves of the format argument that were unterminated
810 int number_unterminated
;
811 /* Number of leaves of the format argument that were not counted above. */
813 } format_check_results
;
817 format_check_results
*res
;
818 function_format_info
*info
;
820 } format_check_context
;
822 static void check_format_info (function_format_info
*, tree
);
823 static void check_format_arg (void *, tree
, unsigned HOST_WIDE_INT
);
824 static void check_format_info_main (format_check_results
*,
825 function_format_info
*,
826 const char *, int, tree
,
827 unsigned HOST_WIDE_INT
, alloc_pool
);
829 static void init_dollar_format_checking (int, tree
);
830 static int maybe_read_dollar_number (const char **, int,
831 tree
, tree
*, const format_kind_info
*);
832 static bool avoid_dollar_number (const char *);
833 static void finish_dollar_format_checking (format_check_results
*, int);
835 static const format_flag_spec
*get_flag_spec (const format_flag_spec
*,
838 static void check_format_types (format_wanted_type
*, const char *, int);
839 static void format_type_warning (const char *, const char *, int, tree
,
840 int, const char *, tree
, int);
842 /* Decode a format type from a string, returning the type, or
843 format_type_error if not valid, in which case the caller should print an
846 decode_format_type (const char *s
)
851 for (i
= 0; i
< n_format_types
; i
++)
854 if (!strcmp (s
, format_types
[i
].name
))
856 alen
= strlen (format_types
[i
].name
);
857 if (slen
== alen
+ 4 && s
[0] == '_' && s
[1] == '_'
858 && s
[slen
- 1] == '_' && s
[slen
- 2] == '_'
859 && !strncmp (s
+ 2, format_types
[i
].name
, alen
))
862 return format_type_error
;
866 /* Check the argument list of a call to printf, scanf, etc.
867 ATTRS are the attributes on the function type. There are NARGS argument
868 values in the array ARGARRAY.
869 Also, if -Wmissing-format-attribute,
870 warn for calls to vprintf or vscanf in functions with no such format
871 attribute themselves. */
874 check_function_format (tree attrs
, int nargs
, tree
*argarray
)
878 /* See if this function has any format attributes. */
879 for (a
= attrs
; a
; a
= TREE_CHAIN (a
))
881 if (is_attribute_p ("format", TREE_PURPOSE (a
)))
884 function_format_info info
;
885 decode_format_attr (TREE_VALUE (a
), &info
, 1);
888 /* FIXME: Rewrite all the internal functions in this file
889 to use the ARGARRAY directly instead of constructing this
891 tree params
= NULL_TREE
;
893 for (i
= nargs
- 1; i
>= 0; i
--)
894 params
= tree_cons (NULL_TREE
, argarray
[i
], params
);
895 check_format_info (&info
, params
);
897 if (warn_missing_format_attribute
&& info
.first_arg_num
== 0
898 && (format_types
[info
.format_type
].flags
899 & (int) FMT_FLAG_ARG_CONVERT
))
902 for (c
= TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl
));
905 if (is_attribute_p ("format", TREE_PURPOSE (c
))
906 && (decode_format_type (IDENTIFIER_POINTER
907 (TREE_VALUE (TREE_VALUE (c
))))
908 == info
.format_type
))
912 /* Check if the current function has a parameter to which
913 the format attribute could be attached; if not, it
914 can't be a candidate for a format attribute, despite
915 the vprintf-like or vscanf-like call. */
917 for (args
= DECL_ARGUMENTS (current_function_decl
);
919 args
= TREE_CHAIN (args
))
921 if (TREE_CODE (TREE_TYPE (args
)) == POINTER_TYPE
922 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args
)))
927 warning (OPT_Wmissing_format_attribute
, "function might "
928 "be possible candidate for %qs format attribute",
929 format_types
[info
.format_type
].name
);
937 /* Variables used by the checking of $ operand number formats. */
938 static char *dollar_arguments_used
= NULL
;
939 static char *dollar_arguments_pointer_p
= NULL
;
940 static int dollar_arguments_alloc
= 0;
941 static int dollar_arguments_count
;
942 static int dollar_first_arg_num
;
943 static int dollar_max_arg_used
;
944 static int dollar_format_warned
;
946 /* Initialize the checking for a format string that may contain $
947 parameter number specifications; we will need to keep track of whether
948 each parameter has been used. FIRST_ARG_NUM is the number of the first
949 argument that is a parameter to the format, or 0 for a vprintf-style
950 function; PARAMS is the list of arguments starting at this argument. */
953 init_dollar_format_checking (int first_arg_num
, tree params
)
955 tree oparams
= params
;
957 dollar_first_arg_num
= first_arg_num
;
958 dollar_arguments_count
= 0;
959 dollar_max_arg_used
= 0;
960 dollar_format_warned
= 0;
961 if (first_arg_num
> 0)
965 dollar_arguments_count
++;
966 params
= TREE_CHAIN (params
);
969 if (dollar_arguments_alloc
< dollar_arguments_count
)
971 if (dollar_arguments_used
)
972 free (dollar_arguments_used
);
973 if (dollar_arguments_pointer_p
)
974 free (dollar_arguments_pointer_p
);
975 dollar_arguments_alloc
= dollar_arguments_count
;
976 dollar_arguments_used
= XNEWVEC (char, dollar_arguments_alloc
);
977 dollar_arguments_pointer_p
= XNEWVEC (char, dollar_arguments_alloc
);
979 if (dollar_arguments_alloc
)
981 memset (dollar_arguments_used
, 0, dollar_arguments_alloc
);
982 if (first_arg_num
> 0)
988 dollar_arguments_pointer_p
[i
] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params
)))
990 params
= TREE_CHAIN (params
);
998 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
999 is set, it is an error if one is not found; otherwise, it is OK. If
1000 such a number is found, check whether it is within range and mark that
1001 numbered operand as being used for later checking. Returns the operand
1002 number if found and within range, zero if no such number was found and
1003 this is OK, or -1 on error. PARAMS points to the first operand of the
1004 format; PARAM_PTR is made to point to the parameter referred to. If
1005 a $ format is found, *FORMAT is updated to point just after it. */
1008 maybe_read_dollar_number (const char **format
,
1009 int dollar_needed
, tree params
, tree
*param_ptr
,
1010 const format_kind_info
*fki
)
1014 const char *fcp
= *format
;
1015 if (!ISDIGIT (*fcp
))
1019 warning (OPT_Wformat
, "missing $ operand number in format");
1027 while (ISDIGIT (*fcp
))
1030 nargnum
= 10 * argnum
+ (*fcp
- '0');
1031 if (nargnum
< 0 || nargnum
/ 10 != argnum
)
1040 warning (OPT_Wformat
, "missing $ operand number in format");
1047 if (pedantic
&& !dollar_format_warned
)
1049 warning (OPT_Wformat
, "%s does not support %%n$ operand number formats",
1050 C_STD_NAME (STD_EXT
));
1051 dollar_format_warned
= 1;
1053 if (overflow_flag
|| argnum
== 0
1054 || (dollar_first_arg_num
&& argnum
> dollar_arguments_count
))
1056 warning (OPT_Wformat
, "operand number out of range in format");
1059 if (argnum
> dollar_max_arg_used
)
1060 dollar_max_arg_used
= argnum
;
1061 /* For vprintf-style functions we may need to allocate more memory to
1062 track which arguments are used. */
1063 while (dollar_arguments_alloc
< dollar_max_arg_used
)
1066 nalloc
= 2 * dollar_arguments_alloc
+ 16;
1067 dollar_arguments_used
= XRESIZEVEC (char, dollar_arguments_used
,
1069 dollar_arguments_pointer_p
= XRESIZEVEC (char, dollar_arguments_pointer_p
,
1071 memset (dollar_arguments_used
+ dollar_arguments_alloc
, 0,
1072 nalloc
- dollar_arguments_alloc
);
1073 dollar_arguments_alloc
= nalloc
;
1075 if (!(fki
->flags
& (int) FMT_FLAG_DOLLAR_MULTIPLE
)
1076 && dollar_arguments_used
[argnum
- 1] == 1)
1078 dollar_arguments_used
[argnum
- 1] = 2;
1079 warning (OPT_Wformat
, "format argument %d used more than once in %s format",
1083 dollar_arguments_used
[argnum
- 1] = 1;
1084 if (dollar_first_arg_num
)
1087 *param_ptr
= params
;
1088 for (i
= 1; i
< argnum
&& *param_ptr
!= 0; i
++)
1089 *param_ptr
= TREE_CHAIN (*param_ptr
);
1091 /* This case shouldn't be caught here. */
1092 gcc_assert (*param_ptr
);
1099 /* Ensure that FORMAT does not start with a decimal number followed by
1100 a $; give a diagnostic and return true if it does, false otherwise. */
1103 avoid_dollar_number (const char *format
)
1105 if (!ISDIGIT (*format
))
1107 while (ISDIGIT (*format
))
1111 warning (OPT_Wformat
, "$ operand number used after format without operand number");
1118 /* Finish the checking for a format string that used $ operand number formats
1119 instead of non-$ formats. We check for unused operands before used ones
1120 (a serious error, since the implementation of the format function
1121 can't know what types to pass to va_arg to find the later arguments).
1122 and for unused operands at the end of the format (if we know how many
1123 arguments the format had, so not for vprintf). If there were operand
1124 numbers out of range on a non-vprintf-style format, we won't have reached
1125 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are
1129 finish_dollar_format_checking (format_check_results
*res
, int pointer_gap_ok
)
1132 bool found_pointer_gap
= false;
1133 for (i
= 0; i
< dollar_max_arg_used
; i
++)
1135 if (!dollar_arguments_used
[i
])
1137 if (pointer_gap_ok
&& (dollar_first_arg_num
== 0
1138 || dollar_arguments_pointer_p
[i
]))
1139 found_pointer_gap
= true;
1141 warning (OPT_Wformat
,
1142 "format argument %d unused before used argument %d in $-style format",
1143 i
+ 1, dollar_max_arg_used
);
1146 if (found_pointer_gap
1147 || (dollar_first_arg_num
1148 && dollar_max_arg_used
< dollar_arguments_count
))
1150 res
->number_other
--;
1151 res
->number_dollar_extra_args
++;
1156 /* Retrieve the specification for a format flag. SPEC contains the
1157 specifications for format flags for the applicable kind of format.
1158 FLAG is the flag in question. If PREDICATES is NULL, the basic
1159 spec for that flag must be retrieved and must exist. If
1160 PREDICATES is not NULL, it is a string listing possible predicates
1161 for the spec entry; if an entry predicated on any of these is
1162 found, it is returned, otherwise NULL is returned. */
1164 static const format_flag_spec
*
1165 get_flag_spec (const format_flag_spec
*spec
, int flag
, const char *predicates
)
1168 for (i
= 0; spec
[i
].flag_char
!= 0; i
++)
1170 if (spec
[i
].flag_char
!= flag
)
1172 if (predicates
!= NULL
)
1174 if (spec
[i
].predicate
!= 0
1175 && strchr (predicates
, spec
[i
].predicate
) != 0)
1178 else if (spec
[i
].predicate
== 0)
1181 gcc_assert (predicates
);
1186 /* Check the argument list of a call to printf, scanf, etc.
1187 INFO points to the function_format_info structure.
1188 PARAMS is the list of argument values. */
1191 check_format_info (function_format_info
*info
, tree params
)
1193 format_check_context format_ctx
;
1194 unsigned HOST_WIDE_INT arg_num
;
1196 format_check_results res
;
1197 /* Skip to format argument. If the argument isn't available, there's
1198 no work for us to do; prototype checking will catch the problem. */
1199 for (arg_num
= 1; ; ++arg_num
)
1203 if (arg_num
== info
->format_num
)
1205 params
= TREE_CHAIN (params
);
1207 format_tree
= TREE_VALUE (params
);
1208 params
= TREE_CHAIN (params
);
1209 if (format_tree
== 0)
1212 res
.number_non_literal
= 0;
1213 res
.number_extra_args
= 0;
1214 res
.number_dollar_extra_args
= 0;
1215 res
.number_wide
= 0;
1216 res
.number_empty
= 0;
1217 res
.number_unterminated
= 0;
1218 res
.number_other
= 0;
1220 format_ctx
.res
= &res
;
1221 format_ctx
.info
= info
;
1222 format_ctx
.params
= params
;
1224 check_function_arguments_recurse (check_format_arg
, &format_ctx
,
1225 format_tree
, arg_num
);
1227 if (res
.number_non_literal
> 0)
1229 /* Functions taking a va_list normally pass a non-literal format
1230 string. These functions typically are declared with
1231 first_arg_num == 0, so avoid warning in those cases. */
1232 if (!(format_types
[info
->format_type
].flags
& (int) FMT_FLAG_ARG_CONVERT
))
1234 /* For strftime-like formats, warn for not checking the format
1235 string; but there are no arguments to check. */
1236 warning (OPT_Wformat_nonliteral
,
1237 "format not a string literal, format string not checked");
1239 else if (info
->first_arg_num
!= 0)
1241 /* If there are no arguments for the format at all, we may have
1242 printf (foo) which is likely to be a security hole. */
1243 while (arg_num
+ 1 < info
->first_arg_num
)
1247 params
= TREE_CHAIN (params
);
1250 if (params
== 0 && warn_format_security
)
1251 warning (OPT_Wformat_security
,
1252 "format not a string literal and no format arguments");
1253 else if (params
== 0 && warn_format_nonliteral
)
1254 warning (OPT_Wformat_nonliteral
,
1255 "format not a string literal and no format arguments");
1257 warning (OPT_Wformat_nonliteral
,
1258 "format not a string literal, argument types not checked");
1262 /* If there were extra arguments to the format, normally warn. However,
1263 the standard does say extra arguments are ignored, so in the specific
1264 case where we have multiple leaves (conditional expressions or
1265 ngettext) allow extra arguments if at least one leaf didn't have extra
1266 arguments, but was otherwise OK (either non-literal or checked OK).
1267 If the format is an empty string, this should be counted similarly to the
1268 case of extra format arguments. */
1269 if (res
.number_extra_args
> 0 && res
.number_non_literal
== 0
1270 && res
.number_other
== 0)
1271 warning (OPT_Wformat_extra_args
, "too many arguments for format");
1272 if (res
.number_dollar_extra_args
> 0 && res
.number_non_literal
== 0
1273 && res
.number_other
== 0)
1274 warning (OPT_Wformat_extra_args
, "unused arguments in $-style format");
1275 if (res
.number_empty
> 0 && res
.number_non_literal
== 0
1276 && res
.number_other
== 0)
1277 warning (OPT_Wformat_zero_length
, "zero-length %s format string",
1278 format_types
[info
->format_type
].name
);
1280 if (res
.number_wide
> 0)
1281 warning (OPT_Wformat
, "format is a wide character string");
1283 if (res
.number_unterminated
> 0)
1284 warning (OPT_Wformat
, "unterminated format string");
1287 /* Callback from check_function_arguments_recurse to check a
1288 format string. FORMAT_TREE is the format parameter. ARG_NUM
1289 is the number of the format argument. CTX points to a
1290 format_check_context. */
1293 check_format_arg (void *ctx
, tree format_tree
,
1294 unsigned HOST_WIDE_INT arg_num
)
1296 format_check_context
*format_ctx
= (format_check_context
*) ctx
;
1297 format_check_results
*res
= format_ctx
->res
;
1298 function_format_info
*info
= format_ctx
->info
;
1299 tree params
= format_ctx
->params
;
1302 HOST_WIDE_INT offset
;
1303 const char *format_chars
;
1304 tree array_size
= 0;
1306 alloc_pool fwt_pool
;
1308 if (integer_zerop (format_tree
))
1310 /* Skip to first argument to check, so we can see if this format
1311 has any arguments (it shouldn't). */
1312 while (arg_num
+ 1 < info
->first_arg_num
)
1316 params
= TREE_CHAIN (params
);
1321 res
->number_other
++;
1323 res
->number_extra_args
++;
1329 if (TREE_CODE (format_tree
) == POINTER_PLUS_EXPR
)
1333 arg0
= TREE_OPERAND (format_tree
, 0);
1334 arg1
= TREE_OPERAND (format_tree
, 1);
1337 if (TREE_CODE (arg1
) == INTEGER_CST
)
1341 res
->number_non_literal
++;
1344 if (!host_integerp (arg1
, 0)
1345 || (offset
= tree_low_cst (arg1
, 0)) < 0)
1347 res
->number_non_literal
++;
1351 if (TREE_CODE (format_tree
) != ADDR_EXPR
)
1353 res
->number_non_literal
++;
1356 format_tree
= TREE_OPERAND (format_tree
, 0);
1357 if (TREE_CODE (format_tree
) == ARRAY_REF
1358 && host_integerp (TREE_OPERAND (format_tree
, 1), 0)
1359 && (offset
+= tree_low_cst (TREE_OPERAND (format_tree
, 1), 0)) >= 0)
1360 format_tree
= TREE_OPERAND (format_tree
, 0);
1361 if (TREE_CODE (format_tree
) == VAR_DECL
1362 && TREE_CODE (TREE_TYPE (format_tree
)) == ARRAY_TYPE
1363 && (array_init
= decl_constant_value (format_tree
)) != format_tree
1364 && TREE_CODE (array_init
) == STRING_CST
)
1366 /* Extract the string constant initializer. Note that this may include
1367 a trailing NUL character that is not in the array (e.g.
1368 const char a[3] = "foo";). */
1369 array_size
= DECL_SIZE_UNIT (format_tree
);
1370 format_tree
= array_init
;
1372 if (TREE_CODE (format_tree
) != STRING_CST
)
1374 res
->number_non_literal
++;
1377 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree
))) != char_type_node
)
1382 format_chars
= TREE_STRING_POINTER (format_tree
);
1383 format_length
= TREE_STRING_LENGTH (format_tree
);
1384 if (array_size
!= 0)
1386 /* Variable length arrays can't be initialized. */
1387 gcc_assert (TREE_CODE (array_size
) == INTEGER_CST
);
1389 if (host_integerp (array_size
, 0))
1391 HOST_WIDE_INT array_size_value
= TREE_INT_CST_LOW (array_size
);
1392 if (array_size_value
> 0
1393 && array_size_value
== (int) array_size_value
1394 && format_length
> array_size_value
)
1395 format_length
= array_size_value
;
1400 if (offset
>= format_length
)
1402 res
->number_non_literal
++;
1405 format_chars
+= offset
;
1406 format_length
-= offset
;
1408 if (format_length
< 1 || format_chars
[--format_length
] != 0)
1410 res
->number_unterminated
++;
1413 if (format_length
== 0)
1415 res
->number_empty
++;
1419 /* Skip to first argument to check. */
1420 while (arg_num
+ 1 < info
->first_arg_num
)
1424 params
= TREE_CHAIN (params
);
1427 /* Provisionally increment res->number_other; check_format_info_main
1428 will decrement it if it finds there are extra arguments, but this way
1429 need not adjust it for every return. */
1430 res
->number_other
++;
1431 fwt_pool
= create_alloc_pool ("format_wanted_type pool",
1432 sizeof (format_wanted_type
), 10);
1433 check_format_info_main (res
, info
, format_chars
, format_length
,
1434 params
, arg_num
, fwt_pool
);
1435 free_alloc_pool (fwt_pool
);
1439 /* Do the main part of checking a call to a format function. FORMAT_CHARS
1440 is the NUL-terminated format string (which at this point may contain
1441 internal NUL characters); FORMAT_LENGTH is its length (excluding the
1442 terminating NUL character). ARG_NUM is one less than the number of
1443 the first format argument to check; PARAMS points to that format
1444 argument in the list of arguments. */
1447 check_format_info_main (format_check_results
*res
,
1448 function_format_info
*info
, const char *format_chars
,
1449 int format_length
, tree params
,
1450 unsigned HOST_WIDE_INT arg_num
, alloc_pool fwt_pool
)
1452 const char *orig_format_chars
= format_chars
;
1453 tree first_fillin_param
= params
;
1455 const format_kind_info
*fki
= &format_types
[info
->format_type
];
1456 const format_flag_spec
*flag_specs
= fki
->flag_specs
;
1457 const format_flag_pair
*bad_flag_pairs
= fki
->bad_flag_pairs
;
1459 /* -1 if no conversions taking an operand have been found; 0 if one has
1460 and it didn't use $; 1 if $ formats are in use. */
1461 int has_operand_number
= -1;
1463 init_dollar_format_checking (info
->first_arg_num
, first_fillin_param
);
1468 int suppressed
= FALSE
;
1469 const char *length_chars
= NULL
;
1470 enum format_lengths length_chars_val
= FMT_LEN_none
;
1471 enum format_std_version length_chars_std
= STD_C89
;
1475 int main_arg_num
= 0;
1476 tree main_arg_params
= 0;
1477 enum format_std_version wanted_type_std
;
1478 const char *wanted_type_name
;
1479 format_wanted_type width_wanted_type
;
1480 format_wanted_type precision_wanted_type
;
1481 format_wanted_type main_wanted_type
;
1482 format_wanted_type
*first_wanted_type
= NULL
;
1483 format_wanted_type
*last_wanted_type
= NULL
;
1484 const format_length_info
*fli
= NULL
;
1485 const format_char_info
*fci
= NULL
;
1486 char flag_chars
[256];
1488 const char *format_start
= format_chars
;
1489 if (*format_chars
== 0)
1491 if (format_chars
- orig_format_chars
!= format_length
)
1492 warning (OPT_Wformat_contains_nul
, "embedded %<\\0%> in format");
1493 if (info
->first_arg_num
!= 0 && params
!= 0
1494 && has_operand_number
<= 0)
1496 res
->number_other
--;
1497 res
->number_extra_args
++;
1499 if (has_operand_number
> 0)
1500 finish_dollar_format_checking (res
, fki
->flags
& (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK
);
1503 if (*format_chars
++ != '%')
1505 if (*format_chars
== 0)
1507 warning (OPT_Wformat
, "spurious trailing %<%%%> in format");
1510 if (*format_chars
== '%')
1517 if ((fki
->flags
& (int) FMT_FLAG_USE_DOLLAR
) && has_operand_number
!= 0)
1519 /* Possibly read a $ operand number at the start of the format.
1520 If one was previously used, one is required here. If one
1521 is not used here, we can't immediately conclude this is a
1522 format without them, since it could be printf %m or scanf %*. */
1524 opnum
= maybe_read_dollar_number (&format_chars
, 0,
1526 &main_arg_params
, fki
);
1531 has_operand_number
= 1;
1532 main_arg_num
= opnum
+ info
->first_arg_num
- 1;
1535 else if (fki
->flags
& FMT_FLAG_USE_DOLLAR
)
1537 if (avoid_dollar_number (format_chars
))
1541 /* Read any format flags, but do not yet validate them beyond removing
1542 duplicates, since in general validation depends on the rest of
1544 while (*format_chars
!= 0
1545 && strchr (fki
->flag_chars
, *format_chars
) != 0)
1547 const format_flag_spec
*s
= get_flag_spec (flag_specs
,
1548 *format_chars
, NULL
);
1549 if (strchr (flag_chars
, *format_chars
) != 0)
1551 warning (OPT_Wformat
, "repeated %s in format", _(s
->name
));
1555 i
= strlen (flag_chars
);
1556 flag_chars
[i
++] = *format_chars
;
1559 if (s
->skip_next_char
)
1562 if (*format_chars
== 0)
1564 warning (OPT_Wformat
, "missing fill character at end of strfmon format");
1571 /* Read any format width, possibly * or *m$. */
1572 if (fki
->width_char
!= 0)
1574 if (fki
->width_type
!= NULL
&& *format_chars
== '*')
1576 i
= strlen (flag_chars
);
1577 flag_chars
[i
++] = fki
->width_char
;
1579 /* "...a field width...may be indicated by an asterisk.
1580 In this case, an int argument supplies the field width..." */
1582 if (has_operand_number
!= 0)
1585 opnum
= maybe_read_dollar_number (&format_chars
,
1586 has_operand_number
== 1,
1593 has_operand_number
= 1;
1594 arg_num
= opnum
+ info
->first_arg_num
- 1;
1597 has_operand_number
= 0;
1601 if (avoid_dollar_number (format_chars
))
1604 if (info
->first_arg_num
!= 0)
1608 warning (OPT_Wformat
, "too few arguments for format");
1611 cur_param
= TREE_VALUE (params
);
1612 if (has_operand_number
<= 0)
1614 params
= TREE_CHAIN (params
);
1617 width_wanted_type
.wanted_type
= *fki
->width_type
;
1618 width_wanted_type
.wanted_type_name
= NULL
;
1619 width_wanted_type
.pointer_count
= 0;
1620 width_wanted_type
.char_lenient_flag
= 0;
1621 width_wanted_type
.writing_in_flag
= 0;
1622 width_wanted_type
.reading_from_flag
= 0;
1623 width_wanted_type
.name
= _("field width");
1624 width_wanted_type
.param
= cur_param
;
1625 width_wanted_type
.arg_num
= arg_num
;
1626 width_wanted_type
.next
= NULL
;
1627 if (last_wanted_type
!= 0)
1628 last_wanted_type
->next
= &width_wanted_type
;
1629 if (first_wanted_type
== 0)
1630 first_wanted_type
= &width_wanted_type
;
1631 last_wanted_type
= &width_wanted_type
;
1636 /* Possibly read a numeric width. If the width is zero,
1637 we complain if appropriate. */
1638 int non_zero_width_char
= FALSE
;
1639 int found_width
= FALSE
;
1640 while (ISDIGIT (*format_chars
))
1643 if (*format_chars
!= '0')
1644 non_zero_width_char
= TRUE
;
1647 if (found_width
&& !non_zero_width_char
&&
1648 (fki
->flags
& (int) FMT_FLAG_ZERO_WIDTH_BAD
))
1649 warning (OPT_Wformat
, "zero width in %s format", fki
->name
);
1652 i
= strlen (flag_chars
);
1653 flag_chars
[i
++] = fki
->width_char
;
1659 /* Read any format left precision (must be a number, not *). */
1660 if (fki
->left_precision_char
!= 0 && *format_chars
== '#')
1663 i
= strlen (flag_chars
);
1664 flag_chars
[i
++] = fki
->left_precision_char
;
1666 if (!ISDIGIT (*format_chars
))
1667 warning (OPT_Wformat
, "empty left precision in %s format", fki
->name
);
1668 while (ISDIGIT (*format_chars
))
1672 /* Read any format precision, possibly * or *m$. */
1673 if (fki
->precision_char
!= 0 && *format_chars
== '.')
1676 i
= strlen (flag_chars
);
1677 flag_chars
[i
++] = fki
->precision_char
;
1679 if (fki
->precision_type
!= NULL
&& *format_chars
== '*')
1681 /* "...a...precision...may be indicated by an asterisk.
1682 In this case, an int argument supplies the...precision." */
1684 if (has_operand_number
!= 0)
1687 opnum
= maybe_read_dollar_number (&format_chars
,
1688 has_operand_number
== 1,
1695 has_operand_number
= 1;
1696 arg_num
= opnum
+ info
->first_arg_num
- 1;
1699 has_operand_number
= 0;
1703 if (avoid_dollar_number (format_chars
))
1706 if (info
->first_arg_num
!= 0)
1710 warning (OPT_Wformat
, "too few arguments for format");
1713 cur_param
= TREE_VALUE (params
);
1714 if (has_operand_number
<= 0)
1716 params
= TREE_CHAIN (params
);
1719 precision_wanted_type
.wanted_type
= *fki
->precision_type
;
1720 precision_wanted_type
.wanted_type_name
= NULL
;
1721 precision_wanted_type
.pointer_count
= 0;
1722 precision_wanted_type
.char_lenient_flag
= 0;
1723 precision_wanted_type
.writing_in_flag
= 0;
1724 precision_wanted_type
.reading_from_flag
= 0;
1725 precision_wanted_type
.name
= _("field precision");
1726 precision_wanted_type
.param
= cur_param
;
1727 precision_wanted_type
.arg_num
= arg_num
;
1728 precision_wanted_type
.next
= NULL
;
1729 if (last_wanted_type
!= 0)
1730 last_wanted_type
->next
= &precision_wanted_type
;
1731 if (first_wanted_type
== 0)
1732 first_wanted_type
= &precision_wanted_type
;
1733 last_wanted_type
= &precision_wanted_type
;
1738 if (!(fki
->flags
& (int) FMT_FLAG_EMPTY_PREC_OK
)
1739 && !ISDIGIT (*format_chars
))
1740 warning (OPT_Wformat
, "empty precision in %s format", fki
->name
);
1741 while (ISDIGIT (*format_chars
))
1746 if (fki
->alloc_char
&& fki
->alloc_char
== *format_chars
)
1748 i
= strlen (flag_chars
);
1749 flag_chars
[i
++] = fki
->alloc_char
;
1754 /* Handle the scanf allocation kludge. */
1755 if (fki
->flags
& (int) FMT_FLAG_SCANF_A_KLUDGE
)
1757 if (*format_chars
== 'a' && !flag_isoc99
)
1759 if (format_chars
[1] == 's' || format_chars
[1] == 'S'
1760 || format_chars
[1] == '[')
1762 /* 'a' is used as a flag. */
1763 i
= strlen (flag_chars
);
1764 flag_chars
[i
++] = 'a';
1771 /* Read any length modifier, if this kind of format has them. */
1772 fli
= fki
->length_char_specs
;
1773 length_chars
= NULL
;
1774 length_chars_val
= FMT_LEN_none
;
1775 length_chars_std
= STD_C89
;
1778 while (fli
->name
!= 0 && fli
->name
[0] != *format_chars
)
1783 if (fli
->double_name
!= 0 && fli
->name
[0] == *format_chars
)
1786 length_chars
= fli
->double_name
;
1787 length_chars_val
= fli
->double_index
;
1788 length_chars_std
= fli
->double_std
;
1792 length_chars
= fli
->name
;
1793 length_chars_val
= fli
->index
;
1794 length_chars_std
= fli
->std
;
1796 i
= strlen (flag_chars
);
1797 flag_chars
[i
++] = fki
->length_code_char
;
1802 /* Warn if the length modifier is non-standard. */
1803 if (ADJ_STD (length_chars_std
) > C_STD_VER
)
1804 warning (OPT_Wformat
,
1805 "%s does not support the %qs %s length modifier",
1806 C_STD_NAME (length_chars_std
), length_chars
,
1811 /* Read any modifier (strftime E/O). */
1812 if (fki
->modifier_chars
!= NULL
)
1814 while (*format_chars
!= 0
1815 && strchr (fki
->modifier_chars
, *format_chars
) != 0)
1817 if (strchr (flag_chars
, *format_chars
) != 0)
1819 const format_flag_spec
*s
= get_flag_spec (flag_specs
,
1820 *format_chars
, NULL
);
1821 warning (OPT_Wformat
, "repeated %s in format", _(s
->name
));
1825 i
= strlen (flag_chars
);
1826 flag_chars
[i
++] = *format_chars
;
1833 format_char
= *format_chars
;
1834 if (format_char
== 0
1835 || (!(fki
->flags
& (int) FMT_FLAG_FANCY_PERCENT_OK
)
1836 && format_char
== '%'))
1838 warning (OPT_Wformat
, "conversion lacks type at end of format");
1842 fci
= fki
->conversion_specs
;
1843 while (fci
->format_chars
!= 0
1844 && strchr (fci
->format_chars
, format_char
) == 0)
1846 if (fci
->format_chars
== 0)
1848 if (ISGRAPH (format_char
))
1849 warning (OPT_Wformat
, "unknown conversion type character %qc in format",
1852 warning (OPT_Wformat
, "unknown conversion type character 0x%x in format",
1858 if (ADJ_STD (fci
->std
) > C_STD_VER
)
1859 warning (OPT_Wformat
, "%s does not support the %<%%%c%> %s format",
1860 C_STD_NAME (fci
->std
), format_char
, fki
->name
);
1863 /* Validate the individual flags used, removing any that are invalid. */
1866 for (i
= 0; flag_chars
[i
] != 0; i
++)
1868 const format_flag_spec
*s
= get_flag_spec (flag_specs
,
1869 flag_chars
[i
], NULL
);
1870 flag_chars
[i
- d
] = flag_chars
[i
];
1871 if (flag_chars
[i
] == fki
->length_code_char
)
1873 if (strchr (fci
->flag_chars
, flag_chars
[i
]) == 0)
1875 warning (OPT_Wformat
, "%s used with %<%%%c%> %s format",
1876 _(s
->name
), format_char
, fki
->name
);
1882 const format_flag_spec
*t
;
1883 if (ADJ_STD (s
->std
) > C_STD_VER
)
1884 warning (OPT_Wformat
, "%s does not support %s",
1885 C_STD_NAME (s
->std
), _(s
->long_name
));
1886 t
= get_flag_spec (flag_specs
, flag_chars
[i
], fci
->flags2
);
1887 if (t
!= NULL
&& ADJ_STD (t
->std
) > ADJ_STD (s
->std
))
1889 const char *long_name
= (t
->long_name
!= NULL
1892 if (ADJ_STD (t
->std
) > C_STD_VER
)
1893 warning (OPT_Wformat
,
1894 "%s does not support %s with the %<%%%c%> %s format",
1895 C_STD_NAME (t
->std
), _(long_name
),
1896 format_char
, fki
->name
);
1900 flag_chars
[i
- d
] = 0;
1903 if ((fki
->flags
& (int) FMT_FLAG_SCANF_A_KLUDGE
)
1904 && strchr (flag_chars
, 'a') != 0)
1906 if (fki
->alloc_char
&& strchr (flag_chars
, fki
->alloc_char
) != 0)
1909 if (fki
->suppression_char
1910 && strchr (flag_chars
, fki
->suppression_char
) != 0)
1913 /* Validate the pairs of flags used. */
1914 for (i
= 0; bad_flag_pairs
[i
].flag_char1
!= 0; i
++)
1916 const format_flag_spec
*s
, *t
;
1917 if (strchr (flag_chars
, bad_flag_pairs
[i
].flag_char1
) == 0)
1919 if (strchr (flag_chars
, bad_flag_pairs
[i
].flag_char2
) == 0)
1921 if (bad_flag_pairs
[i
].predicate
!= 0
1922 && strchr (fci
->flags2
, bad_flag_pairs
[i
].predicate
) == 0)
1924 s
= get_flag_spec (flag_specs
, bad_flag_pairs
[i
].flag_char1
, NULL
);
1925 t
= get_flag_spec (flag_specs
, bad_flag_pairs
[i
].flag_char2
, NULL
);
1926 if (bad_flag_pairs
[i
].ignored
)
1928 if (bad_flag_pairs
[i
].predicate
!= 0)
1929 warning (OPT_Wformat
,
1930 "%s ignored with %s and %<%%%c%> %s format",
1931 _(s
->name
), _(t
->name
), format_char
,
1934 warning (OPT_Wformat
, "%s ignored with %s in %s format",
1935 _(s
->name
), _(t
->name
), fki
->name
);
1939 if (bad_flag_pairs
[i
].predicate
!= 0)
1940 warning (OPT_Wformat
,
1941 "use of %s and %s together with %<%%%c%> %s format",
1942 _(s
->name
), _(t
->name
), format_char
,
1945 warning (OPT_Wformat
, "use of %s and %s together in %s format",
1946 _(s
->name
), _(t
->name
), fki
->name
);
1950 /* Give Y2K warnings. */
1951 if (warn_format_y2k
)
1954 if (strchr (fci
->flags2
, '4') != 0)
1955 if (strchr (flag_chars
, 'E') != 0)
1959 else if (strchr (fci
->flags2
, '3') != 0)
1961 else if (strchr (fci
->flags2
, '2') != 0)
1964 warning (OPT_Wformat_y2k
, "%<%%%c%> yields only last 2 digits of "
1965 "year in some locales", format_char
);
1966 else if (y2k_level
== 2)
1967 warning (OPT_Wformat_y2k
, "%<%%%c%> yields only last 2 digits of "
1968 "year", format_char
);
1971 if (strchr (fci
->flags2
, '[') != 0)
1973 /* Skip over scan set, in case it happens to have '%' in it. */
1974 if (*format_chars
== '^')
1976 /* Find closing bracket; if one is hit immediately, then
1977 it's part of the scan set rather than a terminator. */
1978 if (*format_chars
== ']')
1980 while (*format_chars
&& *format_chars
!= ']')
1982 if (*format_chars
!= ']')
1983 /* The end of the format string was reached. */
1984 warning (OPT_Wformat
, "no closing %<]%> for %<%%[%> format");
1988 wanted_type_name
= 0;
1989 if (fki
->flags
& (int) FMT_FLAG_ARG_CONVERT
)
1991 wanted_type
= (fci
->types
[length_chars_val
].type
1992 ? *fci
->types
[length_chars_val
].type
: 0);
1993 wanted_type_name
= fci
->types
[length_chars_val
].name
;
1994 wanted_type_std
= fci
->types
[length_chars_val
].std
;
1995 if (wanted_type
== 0)
1997 warning (OPT_Wformat
,
1998 "use of %qs length modifier with %qc type character",
1999 length_chars
, format_char
);
2000 /* Heuristic: skip one argument when an invalid length/type
2001 combination is encountered. */
2005 warning (OPT_Wformat
, "too few arguments for format");
2008 params
= TREE_CHAIN (params
);
2012 /* Warn if non-standard, provided it is more non-standard
2013 than the length and type characters that may already
2014 have been warned for. */
2015 && ADJ_STD (wanted_type_std
) > ADJ_STD (length_chars_std
)
2016 && ADJ_STD (wanted_type_std
) > ADJ_STD (fci
->std
))
2018 if (ADJ_STD (wanted_type_std
) > C_STD_VER
)
2019 warning (OPT_Wformat
,
2020 "%s does not support the %<%%%s%c%> %s format",
2021 C_STD_NAME (wanted_type_std
), length_chars
,
2022 format_char
, fki
->name
);
2026 main_wanted_type
.next
= NULL
;
2028 /* Finally. . .check type of argument against desired type! */
2029 if (info
->first_arg_num
== 0)
2031 if ((fci
->pointer_count
== 0 && wanted_type
== void_type_node
)
2034 if (main_arg_num
!= 0)
2037 warning (OPT_Wformat
, "operand number specified with "
2038 "suppressed assignment");
2040 warning (OPT_Wformat
, "operand number specified for format "
2041 "taking no argument");
2046 format_wanted_type
*wanted_type_ptr
;
2048 if (main_arg_num
!= 0)
2050 arg_num
= main_arg_num
;
2051 params
= main_arg_params
;
2056 if (has_operand_number
> 0)
2058 warning (OPT_Wformat
, "missing $ operand number in format");
2062 has_operand_number
= 0;
2065 wanted_type_ptr
= &main_wanted_type
;
2070 warning (OPT_Wformat
, "too few arguments for format");
2074 cur_param
= TREE_VALUE (params
);
2075 params
= TREE_CHAIN (params
);
2077 wanted_type_ptr
->wanted_type
= wanted_type
;
2078 wanted_type_ptr
->wanted_type_name
= wanted_type_name
;
2079 wanted_type_ptr
->pointer_count
= fci
->pointer_count
+ alloc_flag
;
2080 wanted_type_ptr
->char_lenient_flag
= 0;
2081 if (strchr (fci
->flags2
, 'c') != 0)
2082 wanted_type_ptr
->char_lenient_flag
= 1;
2083 wanted_type_ptr
->writing_in_flag
= 0;
2084 wanted_type_ptr
->reading_from_flag
= 0;
2086 wanted_type_ptr
->writing_in_flag
= 1;
2089 if (strchr (fci
->flags2
, 'W') != 0)
2090 wanted_type_ptr
->writing_in_flag
= 1;
2091 if (strchr (fci
->flags2
, 'R') != 0)
2092 wanted_type_ptr
->reading_from_flag
= 1;
2094 wanted_type_ptr
->name
= NULL
;
2095 wanted_type_ptr
->param
= cur_param
;
2096 wanted_type_ptr
->arg_num
= arg_num
;
2097 wanted_type_ptr
->next
= NULL
;
2098 if (last_wanted_type
!= 0)
2099 last_wanted_type
->next
= wanted_type_ptr
;
2100 if (first_wanted_type
== 0)
2101 first_wanted_type
= wanted_type_ptr
;
2102 last_wanted_type
= wanted_type_ptr
;
2107 wanted_type_ptr
= (format_wanted_type
*)
2108 pool_alloc (fwt_pool
);
2110 wanted_type
= *fci
->types
[length_chars_val
].type
;
2111 wanted_type_name
= fci
->types
[length_chars_val
].name
;
2116 if (first_wanted_type
!= 0)
2117 check_format_types (first_wanted_type
, format_start
,
2118 format_chars
- format_start
);
2123 /* Check the argument types from a single format conversion (possibly
2124 including width and precision arguments). */
2126 check_format_types (format_wanted_type
*types
, const char *format_start
,
2129 for (; types
!= 0; types
= types
->next
)
2138 cur_param
= types
->param
;
2139 cur_type
= TREE_TYPE (cur_param
);
2140 if (cur_type
== error_mark_node
)
2142 orig_cur_type
= cur_type
;
2144 wanted_type
= types
->wanted_type
;
2145 arg_num
= types
->arg_num
;
2147 /* The following should not occur here. */
2148 gcc_assert (wanted_type
);
2149 gcc_assert (wanted_type
!= void_type_node
|| types
->pointer_count
);
2151 if (types
->pointer_count
== 0)
2152 wanted_type
= lang_hooks
.types
.type_promotes_to (wanted_type
);
2154 wanted_type
= TYPE_MAIN_VARIANT (wanted_type
);
2156 STRIP_NOPS (cur_param
);
2158 /* Check the types of any additional pointer arguments
2159 that precede the "real" argument. */
2160 for (i
= 0; i
< types
->pointer_count
; ++i
)
2162 if (TREE_CODE (cur_type
) == POINTER_TYPE
)
2164 cur_type
= TREE_TYPE (cur_type
);
2165 if (cur_type
== error_mark_node
)
2168 /* Check for writing through a NULL pointer. */
2169 if (types
->writing_in_flag
2172 && integer_zerop (cur_param
))
2173 warning (OPT_Wformat
, "writing through null pointer "
2174 "(argument %d)", arg_num
);
2176 /* Check for reading through a NULL pointer. */
2177 if (types
->reading_from_flag
2180 && integer_zerop (cur_param
))
2181 warning (OPT_Wformat
, "reading through null pointer "
2182 "(argument %d)", arg_num
);
2184 if (cur_param
!= 0 && TREE_CODE (cur_param
) == ADDR_EXPR
)
2185 cur_param
= TREE_OPERAND (cur_param
, 0);
2189 /* See if this is an attempt to write into a const type with
2190 scanf or with printf "%n". Note: the writing in happens
2191 at the first indirection only, if for example
2192 void * const * is passed to scanf %p; passing
2193 const void ** is simply passing an incompatible type. */
2194 if (types
->writing_in_flag
2196 && (TYPE_READONLY (cur_type
)
2198 && (CONSTANT_CLASS_P (cur_param
)
2199 || (DECL_P (cur_param
)
2200 && TREE_READONLY (cur_param
))))))
2201 warning (OPT_Wformat
, "writing into constant object "
2202 "(argument %d)", arg_num
);
2204 /* If there are extra type qualifiers beyond the first
2205 indirection, then this makes the types technically
2209 && (TYPE_READONLY (cur_type
)
2210 || TYPE_VOLATILE (cur_type
)
2211 || TYPE_RESTRICT (cur_type
)))
2212 warning (OPT_Wformat
, "extra type qualifiers in format "
2213 "argument (argument %d)",
2219 format_type_warning (types
->name
, format_start
, format_length
,
2220 wanted_type
, types
->pointer_count
,
2221 types
->wanted_type_name
, orig_cur_type
,
2227 if (i
< types
->pointer_count
)
2230 cur_type
= TYPE_MAIN_VARIANT (cur_type
);
2232 /* Check whether the argument type is a character type. This leniency
2233 only applies to certain formats, flagged with 'c'.
2235 if (types
->char_lenient_flag
)
2236 char_type_flag
= (cur_type
== char_type_node
2237 || cur_type
== signed_char_type_node
2238 || cur_type
== unsigned_char_type_node
);
2240 /* Check the type of the "real" argument, if there's a type we want. */
2241 if (lang_hooks
.types_compatible_p (wanted_type
, cur_type
))
2243 /* If we want 'void *', allow any pointer type.
2244 (Anything else would already have got a warning.)
2245 With -pedantic, only allow pointers to void and to character
2247 if (wanted_type
== void_type_node
2248 && (!pedantic
|| (i
== 1 && char_type_flag
)))
2250 /* Don't warn about differences merely in signedness, unless
2251 -pedantic. With -pedantic, warn if the type is a pointer
2252 target and not a character type, and for character types at
2253 a second level of indirection. */
2254 if (TREE_CODE (wanted_type
) == INTEGER_TYPE
2255 && TREE_CODE (cur_type
) == INTEGER_TYPE
2256 && (!pedantic
|| i
== 0 || (i
== 1 && char_type_flag
))
2257 && (TYPE_UNSIGNED (wanted_type
)
2258 ? wanted_type
== c_common_unsigned_type (cur_type
)
2259 : wanted_type
== c_common_signed_type (cur_type
)))
2261 /* Likewise, "signed char", "unsigned char" and "char" are
2262 equivalent but the above test won't consider them equivalent. */
2263 if (wanted_type
== char_type_node
2264 && (!pedantic
|| i
< 2)
2267 /* Now we have a type mismatch. */
2268 format_type_warning (types
->name
, format_start
, format_length
,
2269 wanted_type
, types
->pointer_count
,
2270 types
->wanted_type_name
, orig_cur_type
, arg_num
);
2275 /* Give a warning about a format argument of different type from that
2276 expected. DESCR is a description such as "field precision", or
2277 NULL for an ordinary format. For an ordinary format, FORMAT_START
2278 points to where the format starts in the format string and
2279 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument
2280 should have after POINTER_COUNT pointer dereferences.
2281 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE,
2282 or NULL if the ordinary name of the type should be used. ARG_TYPE
2283 is the type of the actual argument. ARG_NUM is the number of that
2286 format_type_warning (const char *descr
, const char *format_start
,
2287 int format_length
, tree wanted_type
, int pointer_count
,
2288 const char *wanted_type_name
, tree arg_type
, int arg_num
)
2291 /* If ARG_TYPE is a typedef with a misleading name (for example,
2292 size_t but not the standard size_t expected by printf %zu), avoid
2293 printing the typedef name. */
2294 if (wanted_type_name
2295 && TYPE_NAME (arg_type
)
2296 && TREE_CODE (TYPE_NAME (arg_type
)) == TYPE_DECL
2297 && DECL_NAME (TYPE_NAME (arg_type
))
2298 && !strcmp (wanted_type_name
,
2299 lang_hooks
.decl_printable_name (TYPE_NAME (arg_type
), 2)))
2300 arg_type
= TYPE_MAIN_VARIANT (arg_type
);
2301 /* The format type and name exclude any '*' for pointers, so those
2302 must be formatted manually. For all the types we currently have,
2303 this is adequate, but formats taking pointers to functions or
2304 arrays would require the full type to be built up in order to
2305 print it with %T. */
2306 p
= (char *) alloca (pointer_count
+ 2);
2307 if (pointer_count
== 0)
2309 else if (c_dialect_cxx ())
2311 memset (p
, '*', pointer_count
);
2312 p
[pointer_count
] = 0;
2317 memset (p
+ 1, '*', pointer_count
);
2318 p
[pointer_count
+ 1] = 0;
2320 if (wanted_type_name
)
2323 warning (OPT_Wformat
, "%s should have type %<%s%s%>, "
2324 "but argument %d has type %qT",
2325 descr
, wanted_type_name
, p
, arg_num
, arg_type
);
2327 warning (OPT_Wformat
, "format %q.*s expects type %<%s%s%>, "
2328 "but argument %d has type %qT",
2329 format_length
, format_start
, wanted_type_name
, p
,
2335 warning (OPT_Wformat
, "%s should have type %<%T%s%>, "
2336 "but argument %d has type %qT",
2337 descr
, wanted_type
, p
, arg_num
, arg_type
);
2339 warning (OPT_Wformat
, "format %q.*s expects type %<%T%s%>, "
2340 "but argument %d has type %qT",
2341 format_length
, format_start
, wanted_type
, p
, arg_num
, arg_type
);
2346 /* Given a format_char_info array FCI, and a character C, this function
2347 returns the index into the conversion_specs where that specifier's
2348 data is located. The character must exist. */
2350 find_char_info_specifier_index (const format_char_info
*fci
, int c
)
2354 for (i
= 0; fci
->format_chars
; i
++, fci
++)
2355 if (strchr (fci
->format_chars
, c
))
2358 /* We shouldn't be looking for a non-existent specifier. */
2362 /* Given a format_length_info array FLI, and a character C, this
2363 function returns the index into the conversion_specs where that
2364 modifier's data is located. The character must exist. */
2366 find_length_info_modifier_index (const format_length_info
*fli
, int c
)
2370 for (i
= 0; fli
->name
; i
++, fli
++)
2371 if (strchr (fli
->name
, c
))
2374 /* We shouldn't be looking for a non-existent modifier. */
2378 /* Determine the type of HOST_WIDE_INT in the code being compiled for
2379 use in GCC's __asm_fprintf__ custom format attribute. You must
2380 have set dynamic_format_types before calling this function. */
2382 init_dynamic_asm_fprintf_info (void)
2388 format_length_info
*new_asm_fprintf_length_specs
;
2391 /* Find the underlying type for HOST_WIDE_INT. For the %w
2392 length modifier to work, one must have issued: "typedef
2393 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2394 prior to using that modifier. */
2395 hwi
= maybe_get_identifier ("__gcc_host_wide_int__");
2398 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2401 hwi
= identifier_global_value (hwi
);
2402 if (!hwi
|| TREE_CODE (hwi
) != TYPE_DECL
)
2404 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2407 hwi
= DECL_ORIGINAL_TYPE (hwi
);
2409 if (hwi
!= long_integer_type_node
&& hwi
!= long_long_integer_type_node
)
2411 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>"
2412 " or %<long long%>");
2416 /* Create a new (writable) copy of asm_fprintf_length_specs. */
2417 new_asm_fprintf_length_specs
= (format_length_info
*)
2418 xmemdup (asm_fprintf_length_specs
,
2419 sizeof (asm_fprintf_length_specs
),
2420 sizeof (asm_fprintf_length_specs
));
2422 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2423 i
= find_length_info_modifier_index (new_asm_fprintf_length_specs
, 'w');
2424 if (hwi
== long_integer_type_node
)
2425 new_asm_fprintf_length_specs
[i
].index
= FMT_LEN_l
;
2426 else if (hwi
== long_long_integer_type_node
)
2427 new_asm_fprintf_length_specs
[i
].index
= FMT_LEN_ll
;
2431 /* Assign the new data for use. */
2432 dynamic_format_types
[asm_fprintf_format_type
].length_char_specs
=
2433 new_asm_fprintf_length_specs
;
2437 /* Determine the type of a "locus" in the code being compiled for use
2438 in GCC's __gcc_gfc__ custom format attribute. You must have set
2439 dynamic_format_types before calling this function. */
2441 init_dynamic_gfc_info (void)
2447 static format_char_info
*gfc_fci
;
2449 /* For the GCC __gcc_gfc__ custom format specifier to work, one
2450 must have declared 'locus' prior to using this attribute. If
2451 we haven't seen this declarations then you shouldn't use the
2452 specifier requiring that type. */
2453 if ((locus
= maybe_get_identifier ("locus")))
2455 locus
= identifier_global_value (locus
);
2458 if (TREE_CODE (locus
) != TYPE_DECL
)
2460 error ("%<locus%> is not defined as a type");
2464 locus
= TREE_TYPE (locus
);
2468 /* Assign the new data for use. */
2470 /* Handle the __gcc_gfc__ format specifics. */
2472 dynamic_format_types
[gcc_gfc_format_type
].conversion_specs
=
2473 gfc_fci
= (format_char_info
*)
2474 xmemdup (gcc_gfc_char_table
,
2475 sizeof (gcc_gfc_char_table
),
2476 sizeof (gcc_gfc_char_table
));
2479 const unsigned i
= find_char_info_specifier_index (gfc_fci
, 'L');
2480 gfc_fci
[i
].types
[0].type
= &locus
;
2481 gfc_fci
[i
].pointer_count
= 1;
2486 /* Determine the types of "tree" and "location_t" in the code being
2487 compiled for use in GCC's diagnostic custom format attributes. You
2488 must have set dynamic_format_types before calling this function. */
2490 init_dynamic_diag_info (void)
2492 static tree t
, loc
, hwi
;
2494 if (!loc
|| !t
|| !hwi
)
2496 static format_char_info
*diag_fci
, *tdiag_fci
, *cdiag_fci
, *cxxdiag_fci
;
2497 static format_length_info
*diag_ls
;
2500 /* For the GCC-diagnostics custom format specifiers to work, one
2501 must have declared 'tree' and/or 'location_t' prior to using
2502 those attributes. If we haven't seen these declarations then
2503 you shouldn't use the specifiers requiring these types.
2504 However we don't force a hard ICE because we may see only one
2505 or the other type. */
2506 if ((loc
= maybe_get_identifier ("location_t")))
2508 loc
= identifier_global_value (loc
);
2511 if (TREE_CODE (loc
) != TYPE_DECL
)
2513 error ("%<location_t%> is not defined as a type");
2517 loc
= TREE_TYPE (loc
);
2521 /* We need to grab the underlying 'union tree_node' so peek into
2522 an extra type level. */
2523 if ((t
= maybe_get_identifier ("tree")))
2525 t
= identifier_global_value (t
);
2528 if (TREE_CODE (t
) != TYPE_DECL
)
2530 error ("%<tree%> is not defined as a type");
2533 else if (TREE_CODE (TREE_TYPE (t
)) != POINTER_TYPE
)
2535 error ("%<tree%> is not defined as a pointer type");
2539 t
= TREE_TYPE (TREE_TYPE (t
));
2543 /* Find the underlying type for HOST_WIDE_INT. For the %w
2544 length modifier to work, one must have issued: "typedef
2545 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code
2546 prior to using that modifier. */
2547 if ((hwi
= maybe_get_identifier ("__gcc_host_wide_int__")))
2549 hwi
= identifier_global_value (hwi
);
2552 if (TREE_CODE (hwi
) != TYPE_DECL
)
2554 error ("%<__gcc_host_wide_int__%> is not defined as a type");
2559 hwi
= DECL_ORIGINAL_TYPE (hwi
);
2561 if (hwi
!= long_integer_type_node
2562 && hwi
!= long_long_integer_type_node
)
2564 error ("%<__gcc_host_wide_int__%> is not defined"
2565 " as %<long%> or %<long long%>");
2572 /* Assign the new data for use. */
2574 /* All the GCC diag formats use the same length specs. */
2576 dynamic_format_types
[gcc_diag_format_type
].length_char_specs
=
2577 dynamic_format_types
[gcc_tdiag_format_type
].length_char_specs
=
2578 dynamic_format_types
[gcc_cdiag_format_type
].length_char_specs
=
2579 dynamic_format_types
[gcc_cxxdiag_format_type
].length_char_specs
=
2580 diag_ls
= (format_length_info
*)
2581 xmemdup (gcc_diag_length_specs
,
2582 sizeof (gcc_diag_length_specs
),
2583 sizeof (gcc_diag_length_specs
));
2586 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */
2587 i
= find_length_info_modifier_index (diag_ls
, 'w');
2588 if (hwi
== long_integer_type_node
)
2589 diag_ls
[i
].index
= FMT_LEN_l
;
2590 else if (hwi
== long_long_integer_type_node
)
2591 diag_ls
[i
].index
= FMT_LEN_ll
;
2596 /* Handle the __gcc_diag__ format specifics. */
2598 dynamic_format_types
[gcc_diag_format_type
].conversion_specs
=
2599 diag_fci
= (format_char_info
*)
2600 xmemdup (gcc_diag_char_table
,
2601 sizeof (gcc_diag_char_table
),
2602 sizeof (gcc_diag_char_table
));
2605 i
= find_char_info_specifier_index (diag_fci
, 'H');
2606 diag_fci
[i
].types
[0].type
= &loc
;
2607 diag_fci
[i
].pointer_count
= 1;
2611 i
= find_char_info_specifier_index (diag_fci
, 'J');
2612 diag_fci
[i
].types
[0].type
= &t
;
2613 diag_fci
[i
].pointer_count
= 1;
2616 /* Handle the __gcc_tdiag__ format specifics. */
2618 dynamic_format_types
[gcc_tdiag_format_type
].conversion_specs
=
2619 tdiag_fci
= (format_char_info
*)
2620 xmemdup (gcc_tdiag_char_table
,
2621 sizeof (gcc_tdiag_char_table
),
2622 sizeof (gcc_tdiag_char_table
));
2625 i
= find_char_info_specifier_index (tdiag_fci
, 'H');
2626 tdiag_fci
[i
].types
[0].type
= &loc
;
2627 tdiag_fci
[i
].pointer_count
= 1;
2631 /* All specifiers taking a tree share the same struct. */
2632 i
= find_char_info_specifier_index (tdiag_fci
, 'D');
2633 tdiag_fci
[i
].types
[0].type
= &t
;
2634 tdiag_fci
[i
].pointer_count
= 1;
2635 i
= find_char_info_specifier_index (tdiag_fci
, 'J');
2636 tdiag_fci
[i
].types
[0].type
= &t
;
2637 tdiag_fci
[i
].pointer_count
= 1;
2640 /* Handle the __gcc_cdiag__ format specifics. */
2642 dynamic_format_types
[gcc_cdiag_format_type
].conversion_specs
=
2643 cdiag_fci
= (format_char_info
*)
2644 xmemdup (gcc_cdiag_char_table
,
2645 sizeof (gcc_cdiag_char_table
),
2646 sizeof (gcc_cdiag_char_table
));
2649 i
= find_char_info_specifier_index (cdiag_fci
, 'H');
2650 cdiag_fci
[i
].types
[0].type
= &loc
;
2651 cdiag_fci
[i
].pointer_count
= 1;
2655 /* All specifiers taking a tree share the same struct. */
2656 i
= find_char_info_specifier_index (cdiag_fci
, 'D');
2657 cdiag_fci
[i
].types
[0].type
= &t
;
2658 cdiag_fci
[i
].pointer_count
= 1;
2659 i
= find_char_info_specifier_index (cdiag_fci
, 'J');
2660 cdiag_fci
[i
].types
[0].type
= &t
;
2661 cdiag_fci
[i
].pointer_count
= 1;
2664 /* Handle the __gcc_cxxdiag__ format specifics. */
2666 dynamic_format_types
[gcc_cxxdiag_format_type
].conversion_specs
=
2667 cxxdiag_fci
= (format_char_info
*)
2668 xmemdup (gcc_cxxdiag_char_table
,
2669 sizeof (gcc_cxxdiag_char_table
),
2670 sizeof (gcc_cxxdiag_char_table
));
2673 i
= find_char_info_specifier_index (cxxdiag_fci
, 'H');
2674 cxxdiag_fci
[i
].types
[0].type
= &loc
;
2675 cxxdiag_fci
[i
].pointer_count
= 1;
2679 /* All specifiers taking a tree share the same struct. */
2680 i
= find_char_info_specifier_index (cxxdiag_fci
, 'D');
2681 cxxdiag_fci
[i
].types
[0].type
= &t
;
2682 cxxdiag_fci
[i
].pointer_count
= 1;
2683 i
= find_char_info_specifier_index (cxxdiag_fci
, 'J');
2684 cxxdiag_fci
[i
].types
[0].type
= &t
;
2685 cxxdiag_fci
[i
].pointer_count
= 1;
2690 #ifdef TARGET_FORMAT_TYPES
2691 extern const format_kind_info TARGET_FORMAT_TYPES
[];
2694 /* Handle a "format" attribute; arguments as in
2695 struct attribute_spec.handler. */
2697 handle_format_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
2698 int flags
, bool *no_add_attrs
)
2701 function_format_info info
;
2704 #ifdef TARGET_FORMAT_TYPES
2705 /* If the target provides additional format types, we need to
2706 add them to FORMAT_TYPES at first use. */
2707 if (TARGET_FORMAT_TYPES
!= NULL
&& !dynamic_format_types
)
2709 dynamic_format_types
= xmalloc ((n_format_types
+ TARGET_N_FORMAT_TYPES
)
2710 * sizeof (dynamic_format_types
[0]));
2711 memcpy (dynamic_format_types
, format_types_orig
,
2712 sizeof (format_types_orig
));
2713 memcpy (&dynamic_format_types
[n_format_types
], TARGET_FORMAT_TYPES
,
2714 TARGET_N_FORMAT_TYPES
* sizeof (dynamic_format_types
[0]));
2716 format_types
= dynamic_format_types
;
2717 n_format_types
+= TARGET_N_FORMAT_TYPES
;
2721 if (!decode_format_attr (args
, &info
, 0))
2723 *no_add_attrs
= true;
2727 argument
= TYPE_ARG_TYPES (type
);
2730 if (!check_format_string (argument
, info
.format_num
, flags
,
2734 if (info
.first_arg_num
!= 0)
2736 unsigned HOST_WIDE_INT arg_num
= 1;
2738 /* Verify that first_arg_num points to the last arg,
2741 arg_num
++, argument
= TREE_CHAIN (argument
);
2743 if (arg_num
!= info
.first_arg_num
)
2745 if (!(flags
& (int) ATTR_FLAG_BUILT_IN
))
2746 error ("args to be formatted is not %<...%>");
2747 *no_add_attrs
= true;
2753 if (info
.format_type
== strftime_format_type
&& info
.first_arg_num
!= 0)
2755 error ("strftime formats cannot format arguments");
2756 *no_add_attrs
= true;
2760 /* If this is a custom GCC-internal format type, we have to
2761 initialize certain bits a runtime. */
2762 if (info
.format_type
== asm_fprintf_format_type
2763 || info
.format_type
== gcc_gfc_format_type
2764 || info
.format_type
== gcc_diag_format_type
2765 || info
.format_type
== gcc_tdiag_format_type
2766 || info
.format_type
== gcc_cdiag_format_type
2767 || info
.format_type
== gcc_cxxdiag_format_type
)
2769 /* Our first time through, we have to make sure that our
2770 format_type data is allocated dynamically and is modifiable. */
2771 if (!dynamic_format_types
)
2772 format_types
= dynamic_format_types
= (format_kind_info
*)
2773 xmemdup (format_types_orig
, sizeof (format_types_orig
),
2774 sizeof (format_types_orig
));
2776 /* If this is format __asm_fprintf__, we have to initialize
2777 GCC's notion of HOST_WIDE_INT for checking %wd. */
2778 if (info
.format_type
== asm_fprintf_format_type
)
2779 init_dynamic_asm_fprintf_info ();
2780 /* If this is format __gcc_gfc__, we have to initialize GCC's
2781 notion of 'locus' at runtime for %L. */
2782 else if (info
.format_type
== gcc_gfc_format_type
)
2783 init_dynamic_gfc_info ();
2784 /* If this is one of the diagnostic attributes, then we have to
2785 initialize 'location_t' and 'tree' at runtime. */
2786 else if (info
.format_type
== gcc_diag_format_type
2787 || info
.format_type
== gcc_tdiag_format_type
2788 || info
.format_type
== gcc_cdiag_format_type
2789 || info
.format_type
== gcc_cxxdiag_format_type
)
2790 init_dynamic_diag_info ();