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 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along 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 37 /* Set format warning options according to a -Wformat=n option. */ 38 39 void 40 set_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 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. */ 63 enum 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 70 typedef 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 77 static bool decode_format_attr (tree, function_format_info *, int); 78 static int decode_format_type (const char *); 79 80 static 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); 84 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value, 85 int validated_p); 86 static const char *convert_format_name_to_system_name (const char *attr_name); 87 static bool cmp_attribs (const char *tattr_name, const char *attr_name); 88 89 static int first_target_format_type; 90 static const char *format_name (int format_num); 91 static 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. */ 103 104 static bool 105 valid_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. */ 116 tree 117 handle_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. */ 154 static bool 155 check_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. */ 249 static bool 250 get_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. */ 269 270 static bool 271 decode_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 } 332 333 /* 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. */ 360 enum format_specifier_kind { 361 CF_KIND_FORMAT, 362 CF_KIND_FIELD_WIDTH, 363 CF_KIND_FIELD_PRECISION 364 }; 365 366 static 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. */ 374 typedef 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 410 411 static 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. */ 427 static 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. */ 435 static 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. */ 448 static 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. */ 465 static 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. */ 474 static 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 }; 479 480 481 static 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 }; 495 496 497 static 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 }; 504 505 static 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 }; 517 518 static 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 }; 525 526 static 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 534 535 static const format_flag_pair gcc_gfc_flag_pairs[] = 536 { 537 { 0, 0, 0, 0 } 538 }; 539 540 static 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 553 554 static 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 }; 565 566 567 static const format_flag_pair scanf_flag_pairs[] = 568 { 569 { '*', 'L', 0, 0 }, 570 { 'a', 'm', 0, 0 }, 571 { 0, 0, 0, 0 } 572 }; 573 574 575 static 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 }; 588 589 590 static 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 }; 599 600 601 static 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 }; 615 616 static const format_flag_pair strfmon_flag_pairs[] = 617 { 618 { '+', '(', 0, 0 }, 619 { 0, 0, 0, 0 } 620 }; 621 622 623 static 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 }; 625 626 static 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 }, 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 */ 652 { "b", 0, STD_EXT, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", &dfly_ext_char_info }, 653 { "ry", 0, STD_EXT, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "i", NULL }, 654 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 655 }; 656 657 static const format_char_info asm_fprintf_char_table[] = 658 { 659 /* C89 conversion specifiers. */ 660 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL }, 661 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL }, 662 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL }, 663 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 664 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL }, 665 666 /* asm_fprintf conversion specifiers. */ 667 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 668 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 669 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 670 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 671 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 672 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 673 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 674 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 675 }; 676 677 static const format_char_info gcc_diag_char_table[] = 678 { 679 /* C89 conversion specifiers. */ 680 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 681 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 682 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 683 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 684 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 685 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 686 687 /* Custom conversion specifiers. */ 688 689 /* These will require a "tree" at runtime. */ 690 { "K", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 691 692 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 693 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 694 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 695 }; 696 697 static const format_char_info gcc_tdiag_char_table[] = 698 { 699 /* C89 conversion specifiers. */ 700 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 701 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 702 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 703 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 704 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 705 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 706 707 /* Custom conversion specifiers. */ 708 709 /* These will require a "tree" at runtime. */ 710 { "DFKTEV", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 711 712 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL }, 713 714 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 715 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 716 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 717 }; 718 719 static const format_char_info gcc_cdiag_char_table[] = 720 { 721 /* C89 conversion specifiers. */ 722 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 723 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 724 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 725 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 726 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 727 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 728 729 /* Custom conversion specifiers. */ 730 731 /* These will require a "tree" at runtime. */ 732 { "DEFKTV", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 733 734 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL }, 735 736 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 737 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 738 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 739 }; 740 741 static const format_char_info gcc_cxxdiag_char_table[] = 742 { 743 /* C89 conversion specifiers. */ 744 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 745 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 746 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 747 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 748 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 749 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 750 751 /* Custom conversion specifiers. */ 752 753 /* These will require a "tree" at runtime. */ 754 { "ADEFKSTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL }, 755 756 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL }, 757 758 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */ 759 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 760 761 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 762 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 763 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 764 }; 765 766 static const format_char_info gcc_gfc_char_table[] = 767 { 768 /* C89 conversion specifiers. */ 769 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 770 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 771 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 772 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL }, 773 774 /* gfc conversion specifiers. */ 775 776 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 777 778 /* This will require a "locus" at runtime. */ 779 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL }, 780 781 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 782 }; 783 784 static const format_char_info scan_char_table[] = 785 { 786 /* C89 conversion specifiers. */ 787 { "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 }, 788 { "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 }, 789 { "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 }, 790 { "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 }, 791 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL }, 792 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL }, 793 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL }, 794 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL }, 795 { "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 }, 796 /* C99 conversion specifiers. */ 797 { "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 }, 798 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL }, 799 /* X/Open conversion specifiers. */ 800 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL }, 801 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL }, 802 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 803 }; 804 805 static const format_char_info time_char_table[] = 806 { 807 /* C89 conversion specifiers. */ 808 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL }, 809 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL }, 810 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL }, 811 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL }, 812 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL }, 813 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL }, 814 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL }, 815 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL }, 816 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL }, 817 /* C99 conversion specifiers. */ 818 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL }, 819 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL }, 820 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL }, 821 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL }, 822 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL }, 823 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL }, 824 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL }, 825 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL }, 826 /* GNU conversion specifiers. */ 827 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL }, 828 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL }, 829 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 830 }; 831 832 static const format_char_info monetary_char_table[] = 833 { 834 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL }, 835 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 836 }; 837 838 /* This must be in the same order as enum format_type. */ 839 static const format_kind_info format_types_orig[] = 840 { 841 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL, 842 printf_flag_specs, printf_flag_pairs, 843 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK, 844 'w', 0, 'p', 0, 'L', 0, 845 &integer_type_node, &integer_type_node 846 }, 847 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL, 848 asm_fprintf_flag_specs, asm_fprintf_flag_pairs, 849 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK, 850 'w', 0, 'p', 0, 'L', 0, 851 NULL, NULL 852 }, 853 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+#", NULL, 854 gcc_diag_flag_specs, gcc_diag_flag_pairs, 855 FMT_FLAG_ARG_CONVERT, 856 0, 0, 'p', 0, 'L', 0, 857 NULL, &integer_type_node 858 }, 859 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+#", NULL, 860 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs, 861 FMT_FLAG_ARG_CONVERT, 862 0, 0, 'p', 0, 'L', 0, 863 NULL, &integer_type_node 864 }, 865 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+#", NULL, 866 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs, 867 FMT_FLAG_ARG_CONVERT, 868 0, 0, 'p', 0, 'L', 0, 869 NULL, &integer_type_node 870 }, 871 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL, 872 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs, 873 FMT_FLAG_ARG_CONVERT, 874 0, 0, 'p', 0, 'L', 0, 875 NULL, &integer_type_node 876 }, 877 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL, 878 NULL, gcc_gfc_flag_pairs, 879 FMT_FLAG_ARG_CONVERT, 880 0, 0, 0, 0, 0, 0, 881 NULL, NULL 882 }, 883 { "NSString", NULL, NULL, NULL, NULL, 884 NULL, NULL, 885 FMT_FLAG_ARG_CONVERT|FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL, 0, 0, 0, 0, 0, 0, 886 NULL, NULL 887 }, 888 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL, 889 scanf_flag_specs, scanf_flag_pairs, 890 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK, 891 'w', 0, 0, '*', 'L', 'm', 892 NULL, NULL 893 }, 894 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO", 895 strftime_flag_specs, strftime_flag_pairs, 896 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0, 897 NULL, NULL 898 }, 899 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL, 900 strfmon_flag_specs, strfmon_flag_pairs, 901 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0, 902 NULL, NULL 903 } 904 }; 905 906 /* This layer of indirection allows GCC to reassign format_types with 907 new data if necessary, while still allowing the original data to be 908 const. */ 909 static const format_kind_info *format_types = format_types_orig; 910 /* We can modify this one. We also add target-specific format types 911 to the end of the array. */ 912 static format_kind_info *dynamic_format_types; 913 914 static int n_format_types = ARRAY_SIZE (format_types_orig); 915 916 /* Structure detailing the results of checking a format function call 917 where the format expression may be a conditional expression with 918 many leaves resulting from nested conditional expressions. */ 919 typedef struct 920 { 921 /* Number of leaves of the format argument that could not be checked 922 as they were not string literals. */ 923 int number_non_literal; 924 /* Number of leaves of the format argument that were null pointers or 925 string literals, but had extra format arguments. */ 926 int number_extra_args; 927 /* Number of leaves of the format argument that were null pointers or 928 string literals, but had extra format arguments and used $ operand 929 numbers. */ 930 int number_dollar_extra_args; 931 /* Number of leaves of the format argument that were wide string 932 literals. */ 933 int number_wide; 934 /* Number of leaves of the format argument that were empty strings. */ 935 int number_empty; 936 /* Number of leaves of the format argument that were unterminated 937 strings. */ 938 int number_unterminated; 939 /* Number of leaves of the format argument that were not counted above. */ 940 int number_other; 941 } format_check_results; 942 943 typedef struct 944 { 945 format_check_results *res; 946 function_format_info *info; 947 tree params; 948 } format_check_context; 949 950 /* Return the format name (as specified in the original table) for the format 951 type indicated by format_num. */ 952 static const char * 953 format_name (int format_num) 954 { 955 if (format_num >= 0 && format_num < n_format_types) 956 return format_types[format_num].name; 957 gcc_unreachable (); 958 } 959 960 /* Return the format flags (as specified in the original table) for the format 961 type indicated by format_num. */ 962 static int 963 format_flags (int format_num) 964 { 965 if (format_num >= 0 && format_num < n_format_types) 966 return format_types[format_num].flags; 967 gcc_unreachable (); 968 } 969 970 static void check_format_info (function_format_info *, tree); 971 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT); 972 static void check_format_info_main (format_check_results *, 973 function_format_info *, 974 const char *, int, tree, 975 unsigned HOST_WIDE_INT, alloc_pool); 976 977 static void init_dollar_format_checking (int, tree); 978 static int maybe_read_dollar_number (const char **, int, 979 tree, tree *, const format_kind_info *); 980 static bool avoid_dollar_number (const char *); 981 static void finish_dollar_format_checking (format_check_results *, int); 982 983 static const format_flag_spec *get_flag_spec (const format_flag_spec *, 984 int, const char *); 985 986 static void check_format_types (format_wanted_type *); 987 static void format_type_warning (format_wanted_type *, tree, tree); 988 989 /* Decode a format type from a string, returning the type, or 990 format_type_error if not valid, in which case the caller should print an 991 error message. */ 992 static int 993 decode_format_type (const char *s) 994 { 995 int i; 996 int slen; 997 998 s = convert_format_name_to_system_name (s); 999 slen = strlen (s); 1000 for (i = 0; i < n_format_types; i++) 1001 { 1002 int alen; 1003 if (!strcmp (s, format_types[i].name)) 1004 return i; 1005 alen = strlen (format_types[i].name); 1006 if (slen == alen + 4 && s[0] == '_' && s[1] == '_' 1007 && s[slen - 1] == '_' && s[slen - 2] == '_' 1008 && !strncmp (s + 2, format_types[i].name, alen)) 1009 return i; 1010 } 1011 return format_type_error; 1012 } 1013 1014 1015 /* Check the argument list of a call to printf, scanf, etc. 1016 ATTRS are the attributes on the function type. There are NARGS argument 1017 values in the array ARGARRAY. 1018 Also, if -Wmissing-format-attribute, 1019 warn for calls to vprintf or vscanf in functions with no such format 1020 attribute themselves. */ 1021 1022 void 1023 check_function_format (tree attrs, int nargs, tree *argarray) 1024 { 1025 tree a; 1026 1027 /* See if this function has any format attributes. */ 1028 for (a = attrs; a; a = TREE_CHAIN (a)) 1029 { 1030 if (is_attribute_p ("format", TREE_PURPOSE (a))) 1031 { 1032 /* Yup; check it. */ 1033 function_format_info info; 1034 decode_format_attr (TREE_VALUE (a), &info, 1); 1035 if (warn_format) 1036 { 1037 /* FIXME: Rewrite all the internal functions in this file 1038 to use the ARGARRAY directly instead of constructing this 1039 temporary list. */ 1040 tree params = NULL_TREE; 1041 int i; 1042 for (i = nargs - 1; i >= 0; i--) 1043 params = tree_cons (NULL_TREE, argarray[i], params); 1044 check_format_info (&info, params); 1045 } 1046 if (warn_missing_format_attribute && info.first_arg_num == 0 1047 && (format_types[info.format_type].flags 1048 & (int) FMT_FLAG_ARG_CONVERT)) 1049 { 1050 tree c; 1051 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl)); 1052 c; 1053 c = TREE_CHAIN (c)) 1054 if (is_attribute_p ("format", TREE_PURPOSE (c)) 1055 && (decode_format_type (IDENTIFIER_POINTER 1056 (TREE_VALUE (TREE_VALUE (c)))) 1057 == info.format_type)) 1058 break; 1059 if (c == NULL_TREE) 1060 { 1061 /* Check if the current function has a parameter to which 1062 the format attribute could be attached; if not, it 1063 can't be a candidate for a format attribute, despite 1064 the vprintf-like or vscanf-like call. */ 1065 tree args; 1066 for (args = DECL_ARGUMENTS (current_function_decl); 1067 args != 0; 1068 args = DECL_CHAIN (args)) 1069 { 1070 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE 1071 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args))) 1072 == char_type_node)) 1073 break; 1074 } 1075 if (args != 0) 1076 warning (OPT_Wmissing_format_attribute, "function might " 1077 "be possible candidate for %qs format attribute", 1078 format_types[info.format_type].name); 1079 } 1080 } 1081 } 1082 } 1083 } 1084 1085 1086 /* Variables used by the checking of $ operand number formats. */ 1087 static char *dollar_arguments_used = NULL; 1088 static char *dollar_arguments_pointer_p = NULL; 1089 static int dollar_arguments_alloc = 0; 1090 static int dollar_arguments_count; 1091 static int dollar_first_arg_num; 1092 static int dollar_max_arg_used; 1093 static int dollar_format_warned; 1094 1095 /* Initialize the checking for a format string that may contain $ 1096 parameter number specifications; we will need to keep track of whether 1097 each parameter has been used. FIRST_ARG_NUM is the number of the first 1098 argument that is a parameter to the format, or 0 for a vprintf-style 1099 function; PARAMS is the list of arguments starting at this argument. */ 1100 1101 static void 1102 init_dollar_format_checking (int first_arg_num, tree params) 1103 { 1104 tree oparams = params; 1105 1106 dollar_first_arg_num = first_arg_num; 1107 dollar_arguments_count = 0; 1108 dollar_max_arg_used = 0; 1109 dollar_format_warned = 0; 1110 if (first_arg_num > 0) 1111 { 1112 while (params) 1113 { 1114 dollar_arguments_count++; 1115 params = TREE_CHAIN (params); 1116 } 1117 } 1118 if (dollar_arguments_alloc < dollar_arguments_count) 1119 { 1120 free (dollar_arguments_used); 1121 free (dollar_arguments_pointer_p); 1122 dollar_arguments_alloc = dollar_arguments_count; 1123 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc); 1124 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc); 1125 } 1126 if (dollar_arguments_alloc) 1127 { 1128 memset (dollar_arguments_used, 0, dollar_arguments_alloc); 1129 if (first_arg_num > 0) 1130 { 1131 int i = 0; 1132 params = oparams; 1133 while (params) 1134 { 1135 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params))) 1136 == POINTER_TYPE); 1137 params = TREE_CHAIN (params); 1138 i++; 1139 } 1140 } 1141 } 1142 } 1143 1144 1145 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED 1146 is set, it is an error if one is not found; otherwise, it is OK. If 1147 such a number is found, check whether it is within range and mark that 1148 numbered operand as being used for later checking. Returns the operand 1149 number if found and within range, zero if no such number was found and 1150 this is OK, or -1 on error. PARAMS points to the first operand of the 1151 format; PARAM_PTR is made to point to the parameter referred to. If 1152 a $ format is found, *FORMAT is updated to point just after it. */ 1153 1154 static int 1155 maybe_read_dollar_number (const char **format, 1156 int dollar_needed, tree params, tree *param_ptr, 1157 const format_kind_info *fki) 1158 { 1159 int argnum; 1160 int overflow_flag; 1161 const char *fcp = *format; 1162 if (!ISDIGIT (*fcp)) 1163 { 1164 if (dollar_needed) 1165 { 1166 warning (OPT_Wformat, "missing $ operand number in format"); 1167 return -1; 1168 } 1169 else 1170 return 0; 1171 } 1172 argnum = 0; 1173 overflow_flag = 0; 1174 while (ISDIGIT (*fcp)) 1175 { 1176 int nargnum; 1177 nargnum = 10 * argnum + (*fcp - '0'); 1178 if (nargnum < 0 || nargnum / 10 != argnum) 1179 overflow_flag = 1; 1180 argnum = nargnum; 1181 fcp++; 1182 } 1183 if (*fcp != '$') 1184 { 1185 if (dollar_needed) 1186 { 1187 warning (OPT_Wformat, "missing $ operand number in format"); 1188 return -1; 1189 } 1190 else 1191 return 0; 1192 } 1193 *format = fcp + 1; 1194 if (pedantic && !dollar_format_warned) 1195 { 1196 warning (OPT_Wformat, "%s does not support %%n$ operand number formats", 1197 C_STD_NAME (STD_EXT)); 1198 dollar_format_warned = 1; 1199 } 1200 if (overflow_flag || argnum == 0 1201 || (dollar_first_arg_num && argnum > dollar_arguments_count)) 1202 { 1203 warning (OPT_Wformat, "operand number out of range in format"); 1204 return -1; 1205 } 1206 if (argnum > dollar_max_arg_used) 1207 dollar_max_arg_used = argnum; 1208 /* For vprintf-style functions we may need to allocate more memory to 1209 track which arguments are used. */ 1210 while (dollar_arguments_alloc < dollar_max_arg_used) 1211 { 1212 int nalloc; 1213 nalloc = 2 * dollar_arguments_alloc + 16; 1214 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used, 1215 nalloc); 1216 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p, 1217 nalloc); 1218 memset (dollar_arguments_used + dollar_arguments_alloc, 0, 1219 nalloc - dollar_arguments_alloc); 1220 dollar_arguments_alloc = nalloc; 1221 } 1222 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE) 1223 && dollar_arguments_used[argnum - 1] == 1) 1224 { 1225 dollar_arguments_used[argnum - 1] = 2; 1226 warning (OPT_Wformat, "format argument %d used more than once in %s format", 1227 argnum, fki->name); 1228 } 1229 else 1230 dollar_arguments_used[argnum - 1] = 1; 1231 if (dollar_first_arg_num) 1232 { 1233 int i; 1234 *param_ptr = params; 1235 for (i = 1; i < argnum && *param_ptr != 0; i++) 1236 *param_ptr = TREE_CHAIN (*param_ptr); 1237 1238 /* This case shouldn't be caught here. */ 1239 gcc_assert (*param_ptr); 1240 } 1241 else 1242 *param_ptr = 0; 1243 return argnum; 1244 } 1245 1246 /* Ensure that FORMAT does not start with a decimal number followed by 1247 a $; give a diagnostic and return true if it does, false otherwise. */ 1248 1249 static bool 1250 avoid_dollar_number (const char *format) 1251 { 1252 if (!ISDIGIT (*format)) 1253 return false; 1254 while (ISDIGIT (*format)) 1255 format++; 1256 if (*format == '$') 1257 { 1258 warning (OPT_Wformat, "$ operand number used after format without operand number"); 1259 return true; 1260 } 1261 return false; 1262 } 1263 1264 1265 /* Finish the checking for a format string that used $ operand number formats 1266 instead of non-$ formats. We check for unused operands before used ones 1267 (a serious error, since the implementation of the format function 1268 can't know what types to pass to va_arg to find the later arguments). 1269 and for unused operands at the end of the format (if we know how many 1270 arguments the format had, so not for vprintf). If there were operand 1271 numbers out of range on a non-vprintf-style format, we won't have reached 1272 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are 1273 pointers. */ 1274 1275 static void 1276 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok) 1277 { 1278 int i; 1279 bool found_pointer_gap = false; 1280 for (i = 0; i < dollar_max_arg_used; i++) 1281 { 1282 if (!dollar_arguments_used[i]) 1283 { 1284 if (pointer_gap_ok && (dollar_first_arg_num == 0 1285 || dollar_arguments_pointer_p[i])) 1286 found_pointer_gap = true; 1287 else 1288 warning (OPT_Wformat, 1289 "format argument %d unused before used argument %d in $-style format", 1290 i + 1, dollar_max_arg_used); 1291 } 1292 } 1293 if (found_pointer_gap 1294 || (dollar_first_arg_num 1295 && dollar_max_arg_used < dollar_arguments_count)) 1296 { 1297 res->number_other--; 1298 res->number_dollar_extra_args++; 1299 } 1300 } 1301 1302 1303 /* Retrieve the specification for a format flag. SPEC contains the 1304 specifications for format flags for the applicable kind of format. 1305 FLAG is the flag in question. If PREDICATES is NULL, the basic 1306 spec for that flag must be retrieved and must exist. If 1307 PREDICATES is not NULL, it is a string listing possible predicates 1308 for the spec entry; if an entry predicated on any of these is 1309 found, it is returned, otherwise NULL is returned. */ 1310 1311 static const format_flag_spec * 1312 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates) 1313 { 1314 int i; 1315 for (i = 0; spec[i].flag_char != 0; i++) 1316 { 1317 if (spec[i].flag_char != flag) 1318 continue; 1319 if (predicates != NULL) 1320 { 1321 if (spec[i].predicate != 0 1322 && strchr (predicates, spec[i].predicate) != 0) 1323 return &spec[i]; 1324 } 1325 else if (spec[i].predicate == 0) 1326 return &spec[i]; 1327 } 1328 gcc_assert (predicates); 1329 return NULL; 1330 } 1331 1332 1333 /* Check the argument list of a call to printf, scanf, etc. 1334 INFO points to the function_format_info structure. 1335 PARAMS is the list of argument values. */ 1336 1337 static void 1338 check_format_info (function_format_info *info, tree params) 1339 { 1340 format_check_context format_ctx; 1341 unsigned HOST_WIDE_INT arg_num; 1342 tree format_tree; 1343 format_check_results res; 1344 /* Skip to format argument. If the argument isn't available, there's 1345 no work for us to do; prototype checking will catch the problem. */ 1346 for (arg_num = 1; ; ++arg_num) 1347 { 1348 if (params == 0) 1349 return; 1350 if (arg_num == info->format_num) 1351 break; 1352 params = TREE_CHAIN (params); 1353 } 1354 format_tree = TREE_VALUE (params); 1355 params = TREE_CHAIN (params); 1356 if (format_tree == 0) 1357 return; 1358 1359 res.number_non_literal = 0; 1360 res.number_extra_args = 0; 1361 res.number_dollar_extra_args = 0; 1362 res.number_wide = 0; 1363 res.number_empty = 0; 1364 res.number_unterminated = 0; 1365 res.number_other = 0; 1366 1367 format_ctx.res = &res; 1368 format_ctx.info = info; 1369 format_ctx.params = params; 1370 1371 check_function_arguments_recurse (check_format_arg, &format_ctx, 1372 format_tree, arg_num); 1373 1374 if (res.number_non_literal > 0) 1375 { 1376 /* Functions taking a va_list normally pass a non-literal format 1377 string. These functions typically are declared with 1378 first_arg_num == 0, so avoid warning in those cases. */ 1379 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT)) 1380 { 1381 /* For strftime-like formats, warn for not checking the format 1382 string; but there are no arguments to check. */ 1383 warning (OPT_Wformat_nonliteral, 1384 "format not a string literal, format string not checked"); 1385 } 1386 else if (info->first_arg_num != 0) 1387 { 1388 /* If there are no arguments for the format at all, we may have 1389 printf (foo) which is likely to be a security hole. */ 1390 while (arg_num + 1 < info->first_arg_num) 1391 { 1392 if (params == 0) 1393 break; 1394 params = TREE_CHAIN (params); 1395 ++arg_num; 1396 } 1397 if (params == 0 && warn_format_security) 1398 warning (OPT_Wformat_security, 1399 "format not a string literal and no format arguments"); 1400 else if (params == 0 && warn_format_nonliteral) 1401 warning (OPT_Wformat_nonliteral, 1402 "format not a string literal and no format arguments"); 1403 else 1404 warning (OPT_Wformat_nonliteral, 1405 "format not a string literal, argument types not checked"); 1406 } 1407 } 1408 1409 /* If there were extra arguments to the format, normally warn. However, 1410 the standard does say extra arguments are ignored, so in the specific 1411 case where we have multiple leaves (conditional expressions or 1412 ngettext) allow extra arguments if at least one leaf didn't have extra 1413 arguments, but was otherwise OK (either non-literal or checked OK). 1414 If the format is an empty string, this should be counted similarly to the 1415 case of extra format arguments. */ 1416 if (res.number_extra_args > 0 && res.number_non_literal == 0 1417 && res.number_other == 0) 1418 warning (OPT_Wformat_extra_args, "too many arguments for format"); 1419 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0 1420 && res.number_other == 0) 1421 warning (OPT_Wformat_extra_args, "unused arguments in $-style format"); 1422 if (res.number_empty > 0 && res.number_non_literal == 0 1423 && res.number_other == 0) 1424 warning (OPT_Wformat_zero_length, "zero-length %s format string", 1425 format_types[info->format_type].name); 1426 1427 if (res.number_wide > 0) 1428 warning (OPT_Wformat, "format is a wide character string"); 1429 1430 if (res.number_unterminated > 0) 1431 warning (OPT_Wformat, "unterminated format string"); 1432 } 1433 1434 /* Callback from check_function_arguments_recurse to check a 1435 format string. FORMAT_TREE is the format parameter. ARG_NUM 1436 is the number of the format argument. CTX points to a 1437 format_check_context. */ 1438 1439 static void 1440 check_format_arg (void *ctx, tree format_tree, 1441 unsigned HOST_WIDE_INT arg_num) 1442 { 1443 format_check_context *format_ctx = (format_check_context *) ctx; 1444 format_check_results *res = format_ctx->res; 1445 function_format_info *info = format_ctx->info; 1446 tree params = format_ctx->params; 1447 1448 int format_length; 1449 HOST_WIDE_INT offset; 1450 const char *format_chars; 1451 tree array_size = 0; 1452 tree array_init; 1453 alloc_pool fwt_pool; 1454 1455 if (integer_zerop (format_tree)) 1456 { 1457 /* Skip to first argument to check, so we can see if this format 1458 has any arguments (it shouldn't). */ 1459 while (arg_num + 1 < info->first_arg_num) 1460 { 1461 if (params == 0) 1462 return; 1463 params = TREE_CHAIN (params); 1464 ++arg_num; 1465 } 1466 1467 if (params == 0) 1468 res->number_other++; 1469 else 1470 res->number_extra_args++; 1471 1472 return; 1473 } 1474 1475 offset = 0; 1476 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR) 1477 { 1478 tree arg0, arg1; 1479 1480 arg0 = TREE_OPERAND (format_tree, 0); 1481 arg1 = TREE_OPERAND (format_tree, 1); 1482 STRIP_NOPS (arg0); 1483 STRIP_NOPS (arg1); 1484 if (TREE_CODE (arg1) == INTEGER_CST) 1485 format_tree = arg0; 1486 else 1487 { 1488 res->number_non_literal++; 1489 return; 1490 } 1491 if (!host_integerp (arg1, 0) 1492 || (offset = tree_low_cst (arg1, 0)) < 0) 1493 { 1494 res->number_non_literal++; 1495 return; 1496 } 1497 } 1498 if (TREE_CODE (format_tree) != ADDR_EXPR) 1499 { 1500 res->number_non_literal++; 1501 return; 1502 } 1503 format_tree = TREE_OPERAND (format_tree, 0); 1504 if (format_types[info->format_type].flags 1505 & (int) FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL) 1506 { 1507 bool objc_str = (info->format_type == gcc_objc_string_format_type); 1508 /* We cannot examine this string here - but we can check that it is 1509 a valid type. */ 1510 if (TREE_CODE (format_tree) != CONST_DECL 1511 || !((objc_str && objc_string_ref_type_p (TREE_TYPE (format_tree))) 1512 || (*targetcm.string_object_ref_type_p) 1513 ((const_tree) TREE_TYPE (format_tree)))) 1514 { 1515 res->number_non_literal++; 1516 return; 1517 } 1518 /* Skip to first argument to check. */ 1519 while (arg_num + 1 < info->first_arg_num) 1520 { 1521 if (params == 0) 1522 return; 1523 params = TREE_CHAIN (params); 1524 ++arg_num; 1525 } 1526 /* So, we have a valid literal string object and one or more params. 1527 We need to use an external helper to parse the string into format 1528 info. For Objective-C variants we provide the resource within the 1529 objc tree, for target variants, via a hook. */ 1530 if (objc_str) 1531 objc_check_format_arg (format_tree, params); 1532 else if (targetcm.check_string_object_format_arg) 1533 (*targetcm.check_string_object_format_arg) (format_tree, params); 1534 /* Else we can't handle it and retire quietly. */ 1535 return; 1536 } 1537 if (TREE_CODE (format_tree) == ARRAY_REF 1538 && host_integerp (TREE_OPERAND (format_tree, 1), 0) 1539 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0) 1540 format_tree = TREE_OPERAND (format_tree, 0); 1541 if (TREE_CODE (format_tree) == VAR_DECL 1542 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE 1543 && (array_init = decl_constant_value (format_tree)) != format_tree 1544 && TREE_CODE (array_init) == STRING_CST) 1545 { 1546 /* Extract the string constant initializer. Note that this may include 1547 a trailing NUL character that is not in the array (e.g. 1548 const char a[3] = "foo";). */ 1549 array_size = DECL_SIZE_UNIT (format_tree); 1550 format_tree = array_init; 1551 } 1552 if (TREE_CODE (format_tree) != STRING_CST) 1553 { 1554 res->number_non_literal++; 1555 return; 1556 } 1557 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node) 1558 { 1559 res->number_wide++; 1560 return; 1561 } 1562 format_chars = TREE_STRING_POINTER (format_tree); 1563 format_length = TREE_STRING_LENGTH (format_tree); 1564 if (array_size != 0) 1565 { 1566 /* Variable length arrays can't be initialized. */ 1567 gcc_assert (TREE_CODE (array_size) == INTEGER_CST); 1568 1569 if (host_integerp (array_size, 0)) 1570 { 1571 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size); 1572 if (array_size_value > 0 1573 && array_size_value == (int) array_size_value 1574 && format_length > array_size_value) 1575 format_length = array_size_value; 1576 } 1577 } 1578 if (offset) 1579 { 1580 if (offset >= format_length) 1581 { 1582 res->number_non_literal++; 1583 return; 1584 } 1585 format_chars += offset; 1586 format_length -= offset; 1587 } 1588 if (format_length < 1 || format_chars[--format_length] != 0) 1589 { 1590 res->number_unterminated++; 1591 return; 1592 } 1593 if (format_length == 0) 1594 { 1595 res->number_empty++; 1596 return; 1597 } 1598 1599 /* Skip to first argument to check. */ 1600 while (arg_num + 1 < info->first_arg_num) 1601 { 1602 if (params == 0) 1603 return; 1604 params = TREE_CHAIN (params); 1605 ++arg_num; 1606 } 1607 /* Provisionally increment res->number_other; check_format_info_main 1608 will decrement it if it finds there are extra arguments, but this way 1609 need not adjust it for every return. */ 1610 res->number_other++; 1611 fwt_pool = create_alloc_pool ("format_wanted_type pool", 1612 sizeof (format_wanted_type), 10); 1613 check_format_info_main (res, info, format_chars, format_length, 1614 params, arg_num, fwt_pool); 1615 free_alloc_pool (fwt_pool); 1616 } 1617 1618 1619 /* Do the main part of checking a call to a format function. FORMAT_CHARS 1620 is the NUL-terminated format string (which at this point may contain 1621 internal NUL characters); FORMAT_LENGTH is its length (excluding the 1622 terminating NUL character). ARG_NUM is one less than the number of 1623 the first format argument to check; PARAMS points to that format 1624 argument in the list of arguments. */ 1625 1626 static void 1627 check_format_info_main (format_check_results *res, 1628 function_format_info *info, const char *format_chars, 1629 int format_length, tree params, 1630 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool) 1631 { 1632 const char *orig_format_chars = format_chars; 1633 tree first_fillin_param = params; 1634 1635 const format_kind_info *fki = &format_types[info->format_type]; 1636 const format_flag_spec *flag_specs = fki->flag_specs; 1637 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs; 1638 1639 /* -1 if no conversions taking an operand have been found; 0 if one has 1640 and it didn't use $; 1 if $ formats are in use. */ 1641 int has_operand_number = -1; 1642 1643 init_dollar_format_checking (info->first_arg_num, first_fillin_param); 1644 1645 while (*format_chars != 0) 1646 { 1647 int i; 1648 int suppressed = FALSE; 1649 const char *length_chars = NULL; 1650 enum format_lengths length_chars_val = FMT_LEN_none; 1651 enum format_std_version length_chars_std = STD_C89; 1652 int format_char; 1653 tree cur_param; 1654 tree wanted_type; 1655 int main_arg_num = 0; 1656 tree main_arg_params = 0; 1657 enum format_std_version wanted_type_std; 1658 const char *wanted_type_name; 1659 format_wanted_type width_wanted_type; 1660 format_wanted_type precision_wanted_type; 1661 format_wanted_type main_wanted_type; 1662 format_wanted_type *first_wanted_type = NULL; 1663 format_wanted_type *last_wanted_type = NULL; 1664 const format_length_info *fli = NULL; 1665 const format_char_info *fci = NULL; 1666 char flag_chars[256]; 1667 int alloc_flag = 0; 1668 int scalar_identity_flag = 0; 1669 const char *format_start; 1670 1671 if (*format_chars++ != '%') 1672 continue; 1673 if (*format_chars == 0) 1674 { 1675 warning (OPT_Wformat, "spurious trailing %<%%%> in format"); 1676 continue; 1677 } 1678 if (*format_chars == '%') 1679 { 1680 ++format_chars; 1681 continue; 1682 } 1683 flag_chars[0] = 0; 1684 1685 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0) 1686 { 1687 /* Possibly read a $ operand number at the start of the format. 1688 If one was previously used, one is required here. If one 1689 is not used here, we can't immediately conclude this is a 1690 format without them, since it could be printf %m or scanf %*. */ 1691 int opnum; 1692 opnum = maybe_read_dollar_number (&format_chars, 0, 1693 first_fillin_param, 1694 &main_arg_params, fki); 1695 if (opnum == -1) 1696 return; 1697 else if (opnum > 0) 1698 { 1699 has_operand_number = 1; 1700 main_arg_num = opnum + info->first_arg_num - 1; 1701 } 1702 } 1703 else if (fki->flags & FMT_FLAG_USE_DOLLAR) 1704 { 1705 if (avoid_dollar_number (format_chars)) 1706 return; 1707 } 1708 1709 /* Read any format flags, but do not yet validate them beyond removing 1710 duplicates, since in general validation depends on the rest of 1711 the format. */ 1712 while (*format_chars != 0 1713 && strchr (fki->flag_chars, *format_chars) != 0) 1714 { 1715 const format_flag_spec *s = get_flag_spec (flag_specs, 1716 *format_chars, NULL); 1717 if (strchr (flag_chars, *format_chars) != 0) 1718 { 1719 warning (OPT_Wformat, "repeated %s in format", _(s->name)); 1720 } 1721 else 1722 { 1723 i = strlen (flag_chars); 1724 flag_chars[i++] = *format_chars; 1725 flag_chars[i] = 0; 1726 } 1727 if (s->skip_next_char) 1728 { 1729 ++format_chars; 1730 if (*format_chars == 0) 1731 { 1732 warning (OPT_Wformat, "missing fill character at end of strfmon format"); 1733 return; 1734 } 1735 } 1736 ++format_chars; 1737 } 1738 1739 /* Read any format width, possibly * or *m$. */ 1740 if (fki->width_char != 0) 1741 { 1742 if (fki->width_type != NULL && *format_chars == '*') 1743 { 1744 i = strlen (flag_chars); 1745 flag_chars[i++] = fki->width_char; 1746 flag_chars[i] = 0; 1747 /* "...a field width...may be indicated by an asterisk. 1748 In this case, an int argument supplies the field width..." */ 1749 ++format_chars; 1750 if (has_operand_number != 0) 1751 { 1752 int opnum; 1753 opnum = maybe_read_dollar_number (&format_chars, 1754 has_operand_number == 1, 1755 first_fillin_param, 1756 ¶ms, fki); 1757 if (opnum == -1) 1758 return; 1759 else if (opnum > 0) 1760 { 1761 has_operand_number = 1; 1762 arg_num = opnum + info->first_arg_num - 1; 1763 } 1764 else 1765 has_operand_number = 0; 1766 } 1767 else 1768 { 1769 if (avoid_dollar_number (format_chars)) 1770 return; 1771 } 1772 if (info->first_arg_num != 0) 1773 { 1774 if (params == 0) 1775 cur_param = NULL; 1776 else 1777 { 1778 cur_param = TREE_VALUE (params); 1779 if (has_operand_number <= 0) 1780 { 1781 params = TREE_CHAIN (params); 1782 ++arg_num; 1783 } 1784 } 1785 width_wanted_type.wanted_type = *fki->width_type; 1786 width_wanted_type.wanted_type_name = NULL; 1787 width_wanted_type.pointer_count = 0; 1788 width_wanted_type.char_lenient_flag = 0; 1789 width_wanted_type.scalar_identity_flag = 0; 1790 width_wanted_type.writing_in_flag = 0; 1791 width_wanted_type.reading_from_flag = 0; 1792 width_wanted_type.kind = CF_KIND_FIELD_WIDTH; 1793 width_wanted_type.format_start = format_chars - 1; 1794 width_wanted_type.format_length = 1; 1795 width_wanted_type.param = cur_param; 1796 width_wanted_type.arg_num = arg_num; 1797 width_wanted_type.next = NULL; 1798 if (last_wanted_type != 0) 1799 last_wanted_type->next = &width_wanted_type; 1800 if (first_wanted_type == 0) 1801 first_wanted_type = &width_wanted_type; 1802 last_wanted_type = &width_wanted_type; 1803 } 1804 } 1805 else 1806 { 1807 /* Possibly read a numeric width. If the width is zero, 1808 we complain if appropriate. */ 1809 int non_zero_width_char = FALSE; 1810 int found_width = FALSE; 1811 while (ISDIGIT (*format_chars)) 1812 { 1813 found_width = TRUE; 1814 if (*format_chars != '0') 1815 non_zero_width_char = TRUE; 1816 ++format_chars; 1817 } 1818 if (found_width && !non_zero_width_char && 1819 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD)) 1820 warning (OPT_Wformat, "zero width in %s format", fki->name); 1821 if (found_width) 1822 { 1823 i = strlen (flag_chars); 1824 flag_chars[i++] = fki->width_char; 1825 flag_chars[i] = 0; 1826 } 1827 } 1828 } 1829 1830 /* Read any format left precision (must be a number, not *). */ 1831 if (fki->left_precision_char != 0 && *format_chars == '#') 1832 { 1833 ++format_chars; 1834 i = strlen (flag_chars); 1835 flag_chars[i++] = fki->left_precision_char; 1836 flag_chars[i] = 0; 1837 if (!ISDIGIT (*format_chars)) 1838 warning (OPT_Wformat, "empty left precision in %s format", fki->name); 1839 while (ISDIGIT (*format_chars)) 1840 ++format_chars; 1841 } 1842 1843 /* Read any format precision, possibly * or *m$. */ 1844 if (fki->precision_char != 0 && *format_chars == '.') 1845 { 1846 ++format_chars; 1847 i = strlen (flag_chars); 1848 flag_chars[i++] = fki->precision_char; 1849 flag_chars[i] = 0; 1850 if (fki->precision_type != NULL && *format_chars == '*') 1851 { 1852 /* "...a...precision...may be indicated by an asterisk. 1853 In this case, an int argument supplies the...precision." */ 1854 ++format_chars; 1855 if (has_operand_number != 0) 1856 { 1857 int opnum; 1858 opnum = maybe_read_dollar_number (&format_chars, 1859 has_operand_number == 1, 1860 first_fillin_param, 1861 ¶ms, fki); 1862 if (opnum == -1) 1863 return; 1864 else if (opnum > 0) 1865 { 1866 has_operand_number = 1; 1867 arg_num = opnum + info->first_arg_num - 1; 1868 } 1869 else 1870 has_operand_number = 0; 1871 } 1872 else 1873 { 1874 if (avoid_dollar_number (format_chars)) 1875 return; 1876 } 1877 if (info->first_arg_num != 0) 1878 { 1879 if (params == 0) 1880 cur_param = NULL; 1881 else 1882 { 1883 cur_param = TREE_VALUE (params); 1884 if (has_operand_number <= 0) 1885 { 1886 params = TREE_CHAIN (params); 1887 ++arg_num; 1888 } 1889 } 1890 precision_wanted_type.wanted_type = *fki->precision_type; 1891 precision_wanted_type.wanted_type_name = NULL; 1892 precision_wanted_type.pointer_count = 0; 1893 precision_wanted_type.char_lenient_flag = 0; 1894 precision_wanted_type.scalar_identity_flag = 0; 1895 precision_wanted_type.writing_in_flag = 0; 1896 precision_wanted_type.reading_from_flag = 0; 1897 precision_wanted_type.kind = CF_KIND_FIELD_PRECISION; 1898 precision_wanted_type.param = cur_param; 1899 precision_wanted_type.format_start = format_chars - 2; 1900 precision_wanted_type.format_length = 2; 1901 precision_wanted_type.arg_num = arg_num; 1902 precision_wanted_type.next = NULL; 1903 if (last_wanted_type != 0) 1904 last_wanted_type->next = &precision_wanted_type; 1905 if (first_wanted_type == 0) 1906 first_wanted_type = &precision_wanted_type; 1907 last_wanted_type = &precision_wanted_type; 1908 } 1909 } 1910 else 1911 { 1912 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK) 1913 && !ISDIGIT (*format_chars)) 1914 warning (OPT_Wformat, "empty precision in %s format", fki->name); 1915 while (ISDIGIT (*format_chars)) 1916 ++format_chars; 1917 } 1918 } 1919 1920 format_start = format_chars; 1921 if (fki->alloc_char && fki->alloc_char == *format_chars) 1922 { 1923 i = strlen (flag_chars); 1924 flag_chars[i++] = fki->alloc_char; 1925 flag_chars[i] = 0; 1926 format_chars++; 1927 } 1928 1929 /* Handle the scanf allocation kludge. */ 1930 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 1931 { 1932 if (*format_chars == 'a' && !flag_isoc99) 1933 { 1934 if (format_chars[1] == 's' || format_chars[1] == 'S' 1935 || format_chars[1] == '[') 1936 { 1937 /* 'a' is used as a flag. */ 1938 i = strlen (flag_chars); 1939 flag_chars[i++] = 'a'; 1940 flag_chars[i] = 0; 1941 format_chars++; 1942 } 1943 } 1944 } 1945 1946 /* Read any length modifier, if this kind of format has them. */ 1947 fli = fki->length_char_specs; 1948 length_chars = NULL; 1949 length_chars_val = FMT_LEN_none; 1950 length_chars_std = STD_C89; 1951 scalar_identity_flag = 0; 1952 if (fli) 1953 { 1954 while (fli->name != 0 1955 && strncmp (fli->name, format_chars, strlen (fli->name))) 1956 fli++; 1957 if (fli->name != 0) 1958 { 1959 format_chars += strlen (fli->name); 1960 if (fli->double_name != 0 && fli->name[0] == *format_chars) 1961 { 1962 format_chars++; 1963 length_chars = fli->double_name; 1964 length_chars_val = fli->double_index; 1965 length_chars_std = fli->double_std; 1966 } 1967 else 1968 { 1969 length_chars = fli->name; 1970 length_chars_val = fli->index; 1971 length_chars_std = fli->std; 1972 scalar_identity_flag = fli->scalar_identity_flag; 1973 } 1974 i = strlen (flag_chars); 1975 flag_chars[i++] = fki->length_code_char; 1976 flag_chars[i] = 0; 1977 } 1978 if (pedantic) 1979 { 1980 /* Warn if the length modifier is non-standard. */ 1981 if (ADJ_STD (length_chars_std) > C_STD_VER) 1982 warning (OPT_Wformat, 1983 "%s does not support the %qs %s length modifier", 1984 C_STD_NAME (length_chars_std), length_chars, 1985 fki->name); 1986 } 1987 } 1988 1989 /* Read any modifier (strftime E/O). */ 1990 if (fki->modifier_chars != NULL) 1991 { 1992 while (*format_chars != 0 1993 && strchr (fki->modifier_chars, *format_chars) != 0) 1994 { 1995 if (strchr (flag_chars, *format_chars) != 0) 1996 { 1997 const format_flag_spec *s = get_flag_spec (flag_specs, 1998 *format_chars, NULL); 1999 warning (OPT_Wformat, "repeated %s in format", _(s->name)); 2000 } 2001 else 2002 { 2003 i = strlen (flag_chars); 2004 flag_chars[i++] = *format_chars; 2005 flag_chars[i] = 0; 2006 } 2007 ++format_chars; 2008 } 2009 } 2010 2011 format_char = *format_chars; 2012 if (format_char == 0 2013 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK) 2014 && format_char == '%')) 2015 { 2016 warning (OPT_Wformat, "conversion lacks type at end of format"); 2017 continue; 2018 } 2019 format_chars++; 2020 fci = fki->conversion_specs; 2021 while (fci->format_chars != 0 2022 && strchr (fci->format_chars, format_char) == 0) 2023 ++fci; 2024 if (fci->format_chars == 0) 2025 { 2026 if (ISGRAPH (format_char)) 2027 warning (OPT_Wformat, "unknown conversion type character %qc in format", 2028 format_char); 2029 else 2030 warning (OPT_Wformat, "unknown conversion type character 0x%x in format", 2031 format_char); 2032 continue; 2033 } 2034 if (pedantic) 2035 { 2036 if (ADJ_STD (fci->std) > C_STD_VER) 2037 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format", 2038 C_STD_NAME (fci->std), format_char, fki->name); 2039 } 2040 2041 /* Validate the individual flags used, removing any that are invalid. */ 2042 { 2043 int d = 0; 2044 for (i = 0; flag_chars[i] != 0; i++) 2045 { 2046 const format_flag_spec *s = get_flag_spec (flag_specs, 2047 flag_chars[i], NULL); 2048 flag_chars[i - d] = flag_chars[i]; 2049 if (flag_chars[i] == fki->length_code_char) 2050 continue; 2051 if (strchr (fci->flag_chars, flag_chars[i]) == 0) 2052 { 2053 warning (OPT_Wformat, "%s used with %<%%%c%> %s format", 2054 _(s->name), format_char, fki->name); 2055 d++; 2056 continue; 2057 } 2058 if (pedantic) 2059 { 2060 const format_flag_spec *t; 2061 if (ADJ_STD (s->std) > C_STD_VER) 2062 warning (OPT_Wformat, "%s does not support %s", 2063 C_STD_NAME (s->std), _(s->long_name)); 2064 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2); 2065 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std)) 2066 { 2067 const char *long_name = (t->long_name != NULL 2068 ? t->long_name 2069 : s->long_name); 2070 if (ADJ_STD (t->std) > C_STD_VER) 2071 warning (OPT_Wformat, 2072 "%s does not support %s with the %<%%%c%> %s format", 2073 C_STD_NAME (t->std), _(long_name), 2074 format_char, fki->name); 2075 } 2076 } 2077 } 2078 flag_chars[i - d] = 0; 2079 } 2080 2081 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 2082 && strchr (flag_chars, 'a') != 0) 2083 alloc_flag = 1; 2084 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0) 2085 alloc_flag = 1; 2086 2087 if (fki->suppression_char 2088 && strchr (flag_chars, fki->suppression_char) != 0) 2089 suppressed = 1; 2090 2091 /* Validate the pairs of flags used. */ 2092 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++) 2093 { 2094 const format_flag_spec *s, *t; 2095 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0) 2096 continue; 2097 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0) 2098 continue; 2099 if (bad_flag_pairs[i].predicate != 0 2100 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0) 2101 continue; 2102 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL); 2103 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL); 2104 if (bad_flag_pairs[i].ignored) 2105 { 2106 if (bad_flag_pairs[i].predicate != 0) 2107 warning (OPT_Wformat, 2108 "%s ignored with %s and %<%%%c%> %s format", 2109 _(s->name), _(t->name), format_char, 2110 fki->name); 2111 else 2112 warning (OPT_Wformat, "%s ignored with %s in %s format", 2113 _(s->name), _(t->name), fki->name); 2114 } 2115 else 2116 { 2117 if (bad_flag_pairs[i].predicate != 0) 2118 warning (OPT_Wformat, 2119 "use of %s and %s together with %<%%%c%> %s format", 2120 _(s->name), _(t->name), format_char, 2121 fki->name); 2122 else 2123 warning (OPT_Wformat, "use of %s and %s together in %s format", 2124 _(s->name), _(t->name), fki->name); 2125 } 2126 } 2127 2128 /* Give Y2K warnings. */ 2129 if (warn_format_y2k) 2130 { 2131 int y2k_level = 0; 2132 if (strchr (fci->flags2, '4') != 0) 2133 if (strchr (flag_chars, 'E') != 0) 2134 y2k_level = 3; 2135 else 2136 y2k_level = 2; 2137 else if (strchr (fci->flags2, '3') != 0) 2138 y2k_level = 3; 2139 else if (strchr (fci->flags2, '2') != 0) 2140 y2k_level = 2; 2141 if (y2k_level == 3) 2142 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of " 2143 "year in some locales", format_char); 2144 else if (y2k_level == 2) 2145 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of " 2146 "year", format_char); 2147 } 2148 2149 if (strchr (fci->flags2, '[') != 0) 2150 { 2151 /* Skip over scan set, in case it happens to have '%' in it. */ 2152 if (*format_chars == '^') 2153 ++format_chars; 2154 /* Find closing bracket; if one is hit immediately, then 2155 it's part of the scan set rather than a terminator. */ 2156 if (*format_chars == ']') 2157 ++format_chars; 2158 while (*format_chars && *format_chars != ']') 2159 ++format_chars; 2160 if (*format_chars != ']') 2161 /* The end of the format string was reached. */ 2162 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format"); 2163 } 2164 2165 wanted_type = 0; 2166 wanted_type_name = 0; 2167 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT) 2168 { 2169 wanted_type = (fci->types[length_chars_val].type 2170 ? *fci->types[length_chars_val].type : 0); 2171 wanted_type_name = fci->types[length_chars_val].name; 2172 wanted_type_std = fci->types[length_chars_val].std; 2173 if (wanted_type == 0) 2174 { 2175 warning (OPT_Wformat, 2176 "use of %qs length modifier with %qc type character", 2177 length_chars, format_char); 2178 /* Heuristic: skip one argument when an invalid length/type 2179 combination is encountered. */ 2180 arg_num++; 2181 if (params != 0) 2182 params = TREE_CHAIN (params); 2183 continue; 2184 } 2185 else if (pedantic 2186 /* Warn if non-standard, provided it is more non-standard 2187 than the length and type characters that may already 2188 have been warned for. */ 2189 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std) 2190 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std)) 2191 { 2192 if (ADJ_STD (wanted_type_std) > C_STD_VER) 2193 warning (OPT_Wformat, 2194 "%s does not support the %<%%%s%c%> %s format", 2195 C_STD_NAME (wanted_type_std), length_chars, 2196 format_char, fki->name); 2197 } 2198 } 2199 2200 main_wanted_type.next = NULL; 2201 2202 /* Finally. . .check type of argument against desired type! */ 2203 if (info->first_arg_num == 0) 2204 continue; 2205 if ((fci->pointer_count == 0 && wanted_type == void_type_node) 2206 || suppressed) 2207 { 2208 if (main_arg_num != 0) 2209 { 2210 if (suppressed) 2211 warning (OPT_Wformat, "operand number specified with " 2212 "suppressed assignment"); 2213 else 2214 warning (OPT_Wformat, "operand number specified for format " 2215 "taking no argument"); 2216 } 2217 } 2218 else 2219 { 2220 format_wanted_type *wanted_type_ptr; 2221 2222 if (main_arg_num != 0) 2223 { 2224 arg_num = main_arg_num; 2225 params = main_arg_params; 2226 } 2227 else 2228 { 2229 ++arg_num; 2230 if (has_operand_number > 0) 2231 { 2232 warning (OPT_Wformat, "missing $ operand number in format"); 2233 return; 2234 } 2235 else 2236 has_operand_number = 0; 2237 } 2238 2239 wanted_type_ptr = &main_wanted_type; 2240 while (fci) 2241 { 2242 if (params == 0) 2243 cur_param = NULL; 2244 else 2245 { 2246 cur_param = TREE_VALUE (params); 2247 params = TREE_CHAIN (params); 2248 } 2249 2250 wanted_type_ptr->wanted_type = wanted_type; 2251 wanted_type_ptr->wanted_type_name = wanted_type_name; 2252 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag; 2253 wanted_type_ptr->char_lenient_flag = 0; 2254 if (strchr (fci->flags2, 'c') != 0) 2255 wanted_type_ptr->char_lenient_flag = 1; 2256 wanted_type_ptr->scalar_identity_flag = 0; 2257 if (scalar_identity_flag) 2258 wanted_type_ptr->scalar_identity_flag = 1; 2259 wanted_type_ptr->writing_in_flag = 0; 2260 wanted_type_ptr->reading_from_flag = 0; 2261 if (alloc_flag) 2262 wanted_type_ptr->writing_in_flag = 1; 2263 else 2264 { 2265 if (strchr (fci->flags2, 'W') != 0) 2266 wanted_type_ptr->writing_in_flag = 1; 2267 if (strchr (fci->flags2, 'R') != 0) 2268 wanted_type_ptr->reading_from_flag = 1; 2269 } 2270 wanted_type_ptr->kind = CF_KIND_FORMAT; 2271 wanted_type_ptr->param = cur_param; 2272 wanted_type_ptr->arg_num = arg_num; 2273 wanted_type_ptr->format_start = format_start; 2274 wanted_type_ptr->format_length = format_chars - format_start; 2275 wanted_type_ptr->next = NULL; 2276 if (last_wanted_type != 0) 2277 last_wanted_type->next = wanted_type_ptr; 2278 if (first_wanted_type == 0) 2279 first_wanted_type = wanted_type_ptr; 2280 last_wanted_type = wanted_type_ptr; 2281 2282 fci = fci->chain; 2283 if (fci) 2284 { 2285 wanted_type_ptr = (format_wanted_type *) 2286 pool_alloc (fwt_pool); 2287 arg_num++; 2288 wanted_type = *fci->types[length_chars_val].type; 2289 wanted_type_name = fci->types[length_chars_val].name; 2290 } 2291 } 2292 } 2293 2294 if (first_wanted_type != 0) 2295 check_format_types (first_wanted_type); 2296 } 2297 2298 if (format_chars - orig_format_chars != format_length) 2299 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format"); 2300 if (info->first_arg_num != 0 && params != 0 2301 && has_operand_number <= 0) 2302 { 2303 res->number_other--; 2304 res->number_extra_args++; 2305 } 2306 if (has_operand_number > 0) 2307 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK); 2308 } 2309 2310 2311 /* Check the argument types from a single format conversion (possibly 2312 including width and precision arguments). */ 2313 static void 2314 check_format_types (format_wanted_type *types) 2315 { 2316 for (; types != 0; types = types->next) 2317 { 2318 tree cur_param; 2319 tree cur_type; 2320 tree orig_cur_type; 2321 tree wanted_type; 2322 int arg_num; 2323 int i; 2324 int char_type_flag; 2325 2326 wanted_type = types->wanted_type; 2327 arg_num = types->arg_num; 2328 2329 /* The following should not occur here. */ 2330 gcc_assert (wanted_type); 2331 gcc_assert (wanted_type != void_type_node || types->pointer_count); 2332 2333 if (types->pointer_count == 0) 2334 wanted_type = lang_hooks.types.type_promotes_to (wanted_type); 2335 2336 wanted_type = TYPE_MAIN_VARIANT (wanted_type); 2337 2338 cur_param = types->param; 2339 if (!cur_param) 2340 { 2341 format_type_warning (types, wanted_type, NULL); 2342 continue; 2343 } 2344 2345 cur_type = TREE_TYPE (cur_param); 2346 if (cur_type == error_mark_node) 2347 continue; 2348 orig_cur_type = cur_type; 2349 char_type_flag = 0; 2350 2351 STRIP_NOPS (cur_param); 2352 2353 /* Check the types of any additional pointer arguments 2354 that precede the "real" argument. */ 2355 for (i = 0; i < types->pointer_count; ++i) 2356 { 2357 if (TREE_CODE (cur_type) == POINTER_TYPE) 2358 { 2359 cur_type = TREE_TYPE (cur_type); 2360 if (cur_type == error_mark_node) 2361 break; 2362 2363 /* Check for writing through a NULL pointer. */ 2364 if (types->writing_in_flag 2365 && i == 0 2366 && cur_param != 0 2367 && integer_zerop (cur_param)) 2368 warning (OPT_Wformat, "writing through null pointer " 2369 "(argument %d)", arg_num); 2370 2371 /* Check for reading through a NULL pointer. */ 2372 if (types->reading_from_flag 2373 && i == 0 2374 && cur_param != 0 2375 && integer_zerop (cur_param)) 2376 warning (OPT_Wformat, "reading through null pointer " 2377 "(argument %d)", arg_num); 2378 2379 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR) 2380 cur_param = TREE_OPERAND (cur_param, 0); 2381 else 2382 cur_param = 0; 2383 2384 /* See if this is an attempt to write into a const type with 2385 scanf or with printf "%n". Note: the writing in happens 2386 at the first indirection only, if for example 2387 void * const * is passed to scanf %p; passing 2388 const void ** is simply passing an incompatible type. */ 2389 if (types->writing_in_flag 2390 && i == 0 2391 && (TYPE_READONLY (cur_type) 2392 || (cur_param != 0 2393 && (CONSTANT_CLASS_P (cur_param) 2394 || (DECL_P (cur_param) 2395 && TREE_READONLY (cur_param)))))) 2396 warning (OPT_Wformat, "writing into constant object " 2397 "(argument %d)", arg_num); 2398 2399 /* If there are extra type qualifiers beyond the first 2400 indirection, then this makes the types technically 2401 incompatible. */ 2402 if (i > 0 2403 && pedantic 2404 && (TYPE_READONLY (cur_type) 2405 || TYPE_VOLATILE (cur_type) 2406 || TYPE_RESTRICT (cur_type))) 2407 warning (OPT_Wformat, "extra type qualifiers in format " 2408 "argument (argument %d)", 2409 arg_num); 2410 2411 } 2412 else 2413 { 2414 format_type_warning (types, wanted_type, orig_cur_type); 2415 break; 2416 } 2417 } 2418 2419 if (i < types->pointer_count) 2420 continue; 2421 2422 cur_type = TYPE_MAIN_VARIANT (cur_type); 2423 2424 /* Check whether the argument type is a character type. This leniency 2425 only applies to certain formats, flagged with 'c'. 2426 */ 2427 if (types->char_lenient_flag) 2428 char_type_flag = (cur_type == char_type_node 2429 || cur_type == signed_char_type_node 2430 || cur_type == unsigned_char_type_node); 2431 2432 /* Check the type of the "real" argument, if there's a type we want. */ 2433 if (lang_hooks.types_compatible_p (wanted_type, cur_type)) 2434 continue; 2435 /* If we want 'void *', allow any pointer type. 2436 (Anything else would already have got a warning.) 2437 With -pedantic, only allow pointers to void and to character 2438 types. */ 2439 if (wanted_type == void_type_node 2440 && (!pedantic || (i == 1 && char_type_flag))) 2441 continue; 2442 /* Don't warn about differences merely in signedness, unless 2443 -pedantic. With -pedantic, warn if the type is a pointer 2444 target and not a character type, and for character types at 2445 a second level of indirection. */ 2446 if (TREE_CODE (wanted_type) == INTEGER_TYPE 2447 && TREE_CODE (cur_type) == INTEGER_TYPE 2448 && (!pedantic || i == 0 || (i == 1 && char_type_flag)) 2449 && (TYPE_UNSIGNED (wanted_type) 2450 ? wanted_type == c_common_unsigned_type (cur_type) 2451 : wanted_type == c_common_signed_type (cur_type))) 2452 continue; 2453 /* Likewise, "signed char", "unsigned char" and "char" are 2454 equivalent but the above test won't consider them equivalent. */ 2455 if (wanted_type == char_type_node 2456 && (!pedantic || i < 2) 2457 && char_type_flag) 2458 continue; 2459 if (types->scalar_identity_flag 2460 && (TREE_CODE (cur_type) == TREE_CODE (wanted_type) 2461 || (INTEGRAL_TYPE_P (cur_type) 2462 && INTEGRAL_TYPE_P (wanted_type))) 2463 && TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type)) 2464 continue; 2465 /* Now we have a type mismatch. */ 2466 format_type_warning (types, wanted_type, orig_cur_type); 2467 } 2468 } 2469 2470 2471 /* Give a warning about a format argument of different type from that 2472 expected. WANTED_TYPE is the type the argument should have, possibly 2473 stripped of pointer dereferences. The description (such as "field 2474 precision"), the placement in the format string, a possibly more 2475 friendly name of WANTED_TYPE, and the number of pointer dereferences 2476 are taken from TYPE. ARG_TYPE is the type of the actual argument, 2477 or NULL if it is missing. */ 2478 static void 2479 format_type_warning (format_wanted_type *type, tree wanted_type, tree arg_type) 2480 { 2481 int kind = type->kind; 2482 const char *wanted_type_name = type->wanted_type_name; 2483 const char *format_start = type->format_start; 2484 int format_length = type->format_length; 2485 int pointer_count = type->pointer_count; 2486 int arg_num = type->arg_num; 2487 2488 char *p; 2489 /* If ARG_TYPE is a typedef with a misleading name (for example, 2490 size_t but not the standard size_t expected by printf %zu), avoid 2491 printing the typedef name. */ 2492 if (wanted_type_name 2493 && arg_type 2494 && TYPE_NAME (arg_type) 2495 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL 2496 && DECL_NAME (TYPE_NAME (arg_type)) 2497 && !strcmp (wanted_type_name, 2498 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2))) 2499 arg_type = TYPE_MAIN_VARIANT (arg_type); 2500 /* The format type and name exclude any '*' for pointers, so those 2501 must be formatted manually. For all the types we currently have, 2502 this is adequate, but formats taking pointers to functions or 2503 arrays would require the full type to be built up in order to 2504 print it with %T. */ 2505 p = (char *) alloca (pointer_count + 2); 2506 if (pointer_count == 0) 2507 p[0] = 0; 2508 else if (c_dialect_cxx ()) 2509 { 2510 memset (p, '*', pointer_count); 2511 p[pointer_count] = 0; 2512 } 2513 else 2514 { 2515 p[0] = ' '; 2516 memset (p + 1, '*', pointer_count); 2517 p[pointer_count + 1] = 0; 2518 } 2519 2520 if (wanted_type_name) 2521 { 2522 if (arg_type) 2523 warning (OPT_Wformat, "%s %<%s%.*s%> expects argument of type %<%s%s%>, " 2524 "but argument %d has type %qT", 2525 gettext (kind_descriptions[kind]), 2526 (kind == CF_KIND_FORMAT ? "%" : ""), 2527 format_length, format_start, 2528 wanted_type_name, p, arg_num, arg_type); 2529 else 2530 warning (OPT_Wformat, "%s %<%s%.*s%> expects a matching %<%s%s%> argument", 2531 gettext (kind_descriptions[kind]), 2532 (kind == CF_KIND_FORMAT ? "%" : ""), 2533 format_length, format_start, wanted_type_name, p); 2534 } 2535 else 2536 { 2537 if (arg_type) 2538 warning (OPT_Wformat, "%s %<%s%.*s%> expects argument of type %<%T%s%>, " 2539 "but argument %d has type %qT", 2540 gettext (kind_descriptions[kind]), 2541 (kind == CF_KIND_FORMAT ? "%" : ""), 2542 format_length, format_start, 2543 wanted_type, p, arg_num, arg_type); 2544 else 2545 warning (OPT_Wformat, "%s %<%s%.*s%> expects a matching %<%T%s%> argument", 2546 gettext (kind_descriptions[kind]), 2547 (kind == CF_KIND_FORMAT ? "%" : ""), 2548 format_length, format_start, wanted_type, p); 2549 } 2550 } 2551 2552 2553 /* Given a format_char_info array FCI, and a character C, this function 2554 returns the index into the conversion_specs where that specifier's 2555 data is located. The character must exist. */ 2556 static unsigned int 2557 find_char_info_specifier_index (const format_char_info *fci, int c) 2558 { 2559 unsigned i; 2560 2561 for (i = 0; fci->format_chars; i++, fci++) 2562 if (strchr (fci->format_chars, c)) 2563 return i; 2564 2565 /* We shouldn't be looking for a non-existent specifier. */ 2566 gcc_unreachable (); 2567 } 2568 2569 /* Given a format_length_info array FLI, and a character C, this 2570 function returns the index into the conversion_specs where that 2571 modifier's data is located. The character must exist. */ 2572 static unsigned int 2573 find_length_info_modifier_index (const format_length_info *fli, int c) 2574 { 2575 unsigned i; 2576 2577 for (i = 0; fli->name; i++, fli++) 2578 if (strchr (fli->name, c)) 2579 return i; 2580 2581 /* We shouldn't be looking for a non-existent modifier. */ 2582 gcc_unreachable (); 2583 } 2584 2585 /* Determine the type of HOST_WIDE_INT in the code being compiled for 2586 use in GCC's __asm_fprintf__ custom format attribute. You must 2587 have set dynamic_format_types before calling this function. */ 2588 static void 2589 init_dynamic_asm_fprintf_info (void) 2590 { 2591 static tree hwi; 2592 2593 if (!hwi) 2594 { 2595 format_length_info *new_asm_fprintf_length_specs; 2596 unsigned int i; 2597 2598 /* Find the underlying type for HOST_WIDE_INT. For the %w 2599 length modifier to work, one must have issued: "typedef 2600 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 2601 prior to using that modifier. */ 2602 hwi = maybe_get_identifier ("__gcc_host_wide_int__"); 2603 if (!hwi) 2604 { 2605 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2606 return; 2607 } 2608 hwi = identifier_global_value (hwi); 2609 if (!hwi || TREE_CODE (hwi) != TYPE_DECL) 2610 { 2611 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2612 return; 2613 } 2614 hwi = DECL_ORIGINAL_TYPE (hwi); 2615 gcc_assert (hwi); 2616 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node) 2617 { 2618 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>" 2619 " or %<long long%>"); 2620 return; 2621 } 2622 2623 /* Create a new (writable) copy of asm_fprintf_length_specs. */ 2624 new_asm_fprintf_length_specs = (format_length_info *) 2625 xmemdup (asm_fprintf_length_specs, 2626 sizeof (asm_fprintf_length_specs), 2627 sizeof (asm_fprintf_length_specs)); 2628 2629 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 2630 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w'); 2631 if (hwi == long_integer_type_node) 2632 new_asm_fprintf_length_specs[i].index = FMT_LEN_l; 2633 else if (hwi == long_long_integer_type_node) 2634 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll; 2635 else 2636 gcc_unreachable (); 2637 2638 /* Assign the new data for use. */ 2639 dynamic_format_types[asm_fprintf_format_type].length_char_specs = 2640 new_asm_fprintf_length_specs; 2641 } 2642 } 2643 2644 /* Determine the type of a "locus" in the code being compiled for use 2645 in GCC's __gcc_gfc__ custom format attribute. You must have set 2646 dynamic_format_types before calling this function. */ 2647 static void 2648 init_dynamic_gfc_info (void) 2649 { 2650 static tree locus; 2651 2652 if (!locus) 2653 { 2654 static format_char_info *gfc_fci; 2655 2656 /* For the GCC __gcc_gfc__ custom format specifier to work, one 2657 must have declared 'locus' prior to using this attribute. If 2658 we haven't seen this declarations then you shouldn't use the 2659 specifier requiring that type. */ 2660 if ((locus = maybe_get_identifier ("locus"))) 2661 { 2662 locus = identifier_global_value (locus); 2663 if (locus) 2664 { 2665 if (TREE_CODE (locus) != TYPE_DECL 2666 || TREE_TYPE (locus) == error_mark_node) 2667 { 2668 error ("%<locus%> is not defined as a type"); 2669 locus = 0; 2670 } 2671 else 2672 locus = TREE_TYPE (locus); 2673 } 2674 } 2675 2676 /* Assign the new data for use. */ 2677 2678 /* Handle the __gcc_gfc__ format specifics. */ 2679 if (!gfc_fci) 2680 dynamic_format_types[gcc_gfc_format_type].conversion_specs = 2681 gfc_fci = (format_char_info *) 2682 xmemdup (gcc_gfc_char_table, 2683 sizeof (gcc_gfc_char_table), 2684 sizeof (gcc_gfc_char_table)); 2685 if (locus) 2686 { 2687 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L'); 2688 gfc_fci[i].types[0].type = &locus; 2689 gfc_fci[i].pointer_count = 1; 2690 } 2691 } 2692 } 2693 2694 /* Determine the types of "tree" and "location_t" in the code being 2695 compiled for use in GCC's diagnostic custom format attributes. You 2696 must have set dynamic_format_types before calling this function. */ 2697 static void 2698 init_dynamic_diag_info (void) 2699 { 2700 static tree t, loc, hwi; 2701 2702 if (!loc || !t || !hwi) 2703 { 2704 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci; 2705 static format_length_info *diag_ls; 2706 unsigned int i; 2707 2708 /* For the GCC-diagnostics custom format specifiers to work, one 2709 must have declared 'tree' and/or 'location_t' prior to using 2710 those attributes. If we haven't seen these declarations then 2711 you shouldn't use the specifiers requiring these types. 2712 However we don't force a hard ICE because we may see only one 2713 or the other type. */ 2714 if ((loc = maybe_get_identifier ("location_t"))) 2715 { 2716 loc = identifier_global_value (loc); 2717 if (loc) 2718 { 2719 if (TREE_CODE (loc) != TYPE_DECL) 2720 { 2721 error ("%<location_t%> is not defined as a type"); 2722 loc = 0; 2723 } 2724 else 2725 loc = TREE_TYPE (loc); 2726 } 2727 } 2728 2729 /* We need to grab the underlying 'union tree_node' so peek into 2730 an extra type level. */ 2731 if ((t = maybe_get_identifier ("tree"))) 2732 { 2733 t = identifier_global_value (t); 2734 if (t) 2735 { 2736 if (TREE_CODE (t) != TYPE_DECL) 2737 { 2738 error ("%<tree%> is not defined as a type"); 2739 t = 0; 2740 } 2741 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE) 2742 { 2743 error ("%<tree%> is not defined as a pointer type"); 2744 t = 0; 2745 } 2746 else 2747 t = TREE_TYPE (TREE_TYPE (t)); 2748 } 2749 } 2750 2751 /* Find the underlying type for HOST_WIDE_INT. For the %w 2752 length modifier to work, one must have issued: "typedef 2753 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 2754 prior to using that modifier. */ 2755 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__"))) 2756 { 2757 hwi = identifier_global_value (hwi); 2758 if (hwi) 2759 { 2760 if (TREE_CODE (hwi) != TYPE_DECL) 2761 { 2762 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2763 hwi = 0; 2764 } 2765 else 2766 { 2767 hwi = DECL_ORIGINAL_TYPE (hwi); 2768 gcc_assert (hwi); 2769 if (hwi != long_integer_type_node 2770 && hwi != long_long_integer_type_node) 2771 { 2772 error ("%<__gcc_host_wide_int__%> is not defined" 2773 " as %<long%> or %<long long%>"); 2774 hwi = 0; 2775 } 2776 } 2777 } 2778 } 2779 2780 /* Assign the new data for use. */ 2781 2782 /* All the GCC diag formats use the same length specs. */ 2783 if (!diag_ls) 2784 dynamic_format_types[gcc_diag_format_type].length_char_specs = 2785 dynamic_format_types[gcc_tdiag_format_type].length_char_specs = 2786 dynamic_format_types[gcc_cdiag_format_type].length_char_specs = 2787 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs = 2788 diag_ls = (format_length_info *) 2789 xmemdup (gcc_diag_length_specs, 2790 sizeof (gcc_diag_length_specs), 2791 sizeof (gcc_diag_length_specs)); 2792 if (hwi) 2793 { 2794 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 2795 i = find_length_info_modifier_index (diag_ls, 'w'); 2796 if (hwi == long_integer_type_node) 2797 diag_ls[i].index = FMT_LEN_l; 2798 else if (hwi == long_long_integer_type_node) 2799 diag_ls[i].index = FMT_LEN_ll; 2800 else 2801 gcc_unreachable (); 2802 } 2803 2804 /* Handle the __gcc_diag__ format specifics. */ 2805 if (!diag_fci) 2806 dynamic_format_types[gcc_diag_format_type].conversion_specs = 2807 diag_fci = (format_char_info *) 2808 xmemdup (gcc_diag_char_table, 2809 sizeof (gcc_diag_char_table), 2810 sizeof (gcc_diag_char_table)); 2811 if (t) 2812 { 2813 i = find_char_info_specifier_index (diag_fci, 'K'); 2814 diag_fci[i].types[0].type = &t; 2815 diag_fci[i].pointer_count = 1; 2816 } 2817 2818 /* Handle the __gcc_tdiag__ format specifics. */ 2819 if (!tdiag_fci) 2820 dynamic_format_types[gcc_tdiag_format_type].conversion_specs = 2821 tdiag_fci = (format_char_info *) 2822 xmemdup (gcc_tdiag_char_table, 2823 sizeof (gcc_tdiag_char_table), 2824 sizeof (gcc_tdiag_char_table)); 2825 if (t) 2826 { 2827 /* All specifiers taking a tree share the same struct. */ 2828 i = find_char_info_specifier_index (tdiag_fci, 'D'); 2829 tdiag_fci[i].types[0].type = &t; 2830 tdiag_fci[i].pointer_count = 1; 2831 i = find_char_info_specifier_index (tdiag_fci, 'K'); 2832 tdiag_fci[i].types[0].type = &t; 2833 tdiag_fci[i].pointer_count = 1; 2834 } 2835 2836 /* Handle the __gcc_cdiag__ format specifics. */ 2837 if (!cdiag_fci) 2838 dynamic_format_types[gcc_cdiag_format_type].conversion_specs = 2839 cdiag_fci = (format_char_info *) 2840 xmemdup (gcc_cdiag_char_table, 2841 sizeof (gcc_cdiag_char_table), 2842 sizeof (gcc_cdiag_char_table)); 2843 if (t) 2844 { 2845 /* All specifiers taking a tree share the same struct. */ 2846 i = find_char_info_specifier_index (cdiag_fci, 'D'); 2847 cdiag_fci[i].types[0].type = &t; 2848 cdiag_fci[i].pointer_count = 1; 2849 i = find_char_info_specifier_index (cdiag_fci, 'K'); 2850 cdiag_fci[i].types[0].type = &t; 2851 cdiag_fci[i].pointer_count = 1; 2852 } 2853 2854 /* Handle the __gcc_cxxdiag__ format specifics. */ 2855 if (!cxxdiag_fci) 2856 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs = 2857 cxxdiag_fci = (format_char_info *) 2858 xmemdup (gcc_cxxdiag_char_table, 2859 sizeof (gcc_cxxdiag_char_table), 2860 sizeof (gcc_cxxdiag_char_table)); 2861 if (t) 2862 { 2863 /* All specifiers taking a tree share the same struct. */ 2864 i = find_char_info_specifier_index (cxxdiag_fci, 'D'); 2865 cxxdiag_fci[i].types[0].type = &t; 2866 cxxdiag_fci[i].pointer_count = 1; 2867 i = find_char_info_specifier_index (cxxdiag_fci, 'K'); 2868 cxxdiag_fci[i].types[0].type = &t; 2869 cxxdiag_fci[i].pointer_count = 1; 2870 } 2871 } 2872 } 2873 2874 #ifdef TARGET_FORMAT_TYPES 2875 extern const format_kind_info TARGET_FORMAT_TYPES[]; 2876 #endif 2877 2878 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES 2879 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[]; 2880 #endif 2881 #ifdef TARGET_OVERRIDES_FORMAT_INIT 2882 extern void TARGET_OVERRIDES_FORMAT_INIT (void); 2883 #endif 2884 2885 /* Attributes such as "printf" are equivalent to those such as 2886 "gnu_printf" unless this is overridden by a target. */ 2887 static const target_ovr_attr gnu_target_overrides_format_attributes[] = 2888 { 2889 { "gnu_printf", "printf" }, 2890 { "gnu_scanf", "scanf" }, 2891 { "gnu_strftime", "strftime" }, 2892 { "gnu_strfmon", "strfmon" }, 2893 { NULL, NULL } 2894 }; 2895 2896 /* Translate to unified attribute name. This is used in decode_format_type and 2897 decode_format_attr. In attr_name the user specified argument is passed. It 2898 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES 2899 or the attr_name passed to this function, if there is no matching entry. */ 2900 static const char * 2901 convert_format_name_to_system_name (const char *attr_name) 2902 { 2903 int i; 2904 2905 if (attr_name == NULL || *attr_name == 0 2906 || strncmp (attr_name, "gcc_", 4) == 0) 2907 return attr_name; 2908 #ifdef TARGET_OVERRIDES_FORMAT_INIT 2909 TARGET_OVERRIDES_FORMAT_INIT (); 2910 #endif 2911 2912 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES 2913 /* Check if format attribute is overridden by target. */ 2914 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL 2915 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0) 2916 { 2917 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i) 2918 { 2919 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src, 2920 attr_name)) 2921 return attr_name; 2922 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst, 2923 attr_name)) 2924 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src; 2925 } 2926 } 2927 #endif 2928 /* Otherwise default to gnu format. */ 2929 for (i = 0; 2930 gnu_target_overrides_format_attributes[i].named_attr_src != NULL; 2931 ++i) 2932 { 2933 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src, 2934 attr_name)) 2935 return attr_name; 2936 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst, 2937 attr_name)) 2938 return gnu_target_overrides_format_attributes[i].named_attr_src; 2939 } 2940 2941 return attr_name; 2942 } 2943 2944 /* Return true if TATTR_NAME and ATTR_NAME are the same format attribute, 2945 counting "name" and "__name__" as the same, false otherwise. */ 2946 static bool 2947 cmp_attribs (const char *tattr_name, const char *attr_name) 2948 { 2949 int alen = strlen (attr_name); 2950 int slen = (tattr_name ? strlen (tattr_name) : 0); 2951 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_' 2952 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_') 2953 { 2954 attr_name += 2; 2955 alen -= 4; 2956 } 2957 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0) 2958 return false; 2959 return true; 2960 } 2961 2962 /* Handle a "format" attribute; arguments as in 2963 struct attribute_spec.handler. */ 2964 tree 2965 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args, 2966 int flags, bool *no_add_attrs) 2967 { 2968 tree type = *node; 2969 function_format_info info; 2970 2971 #ifdef TARGET_FORMAT_TYPES 2972 /* If the target provides additional format types, we need to 2973 add them to FORMAT_TYPES at first use. */ 2974 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types) 2975 { 2976 dynamic_format_types = XNEWVEC (format_kind_info, 2977 n_format_types + TARGET_N_FORMAT_TYPES); 2978 memcpy (dynamic_format_types, format_types_orig, 2979 sizeof (format_types_orig)); 2980 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES, 2981 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0])); 2982 2983 format_types = dynamic_format_types; 2984 /* Provide a reference for the first potential external type. */ 2985 first_target_format_type = n_format_types; 2986 n_format_types += TARGET_N_FORMAT_TYPES; 2987 } 2988 #endif 2989 2990 if (!decode_format_attr (args, &info, 0)) 2991 { 2992 *no_add_attrs = true; 2993 return NULL_TREE; 2994 } 2995 2996 if (prototype_p (type)) 2997 { 2998 if (!check_format_string (type, info.format_num, flags, 2999 no_add_attrs, info.format_type)) 3000 return NULL_TREE; 3001 3002 if (info.first_arg_num != 0) 3003 { 3004 unsigned HOST_WIDE_INT arg_num = 1; 3005 function_args_iterator iter; 3006 tree arg_type; 3007 3008 /* Verify that first_arg_num points to the last arg, 3009 the ... */ 3010 FOREACH_FUNCTION_ARGS (type, arg_type, iter) 3011 arg_num++; 3012 3013 if (arg_num != info.first_arg_num) 3014 { 3015 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 3016 error ("args to be formatted is not %<...%>"); 3017 *no_add_attrs = true; 3018 return NULL_TREE; 3019 } 3020 } 3021 } 3022 3023 /* Check if this is a strftime variant. Just for this variant 3024 FMT_FLAG_ARG_CONVERT is not set. */ 3025 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0 3026 && info.first_arg_num != 0) 3027 { 3028 error ("strftime formats cannot format arguments"); 3029 *no_add_attrs = true; 3030 return NULL_TREE; 3031 } 3032 3033 /* If this is a custom GCC-internal format type, we have to 3034 initialize certain bits at runtime. */ 3035 if (info.format_type == asm_fprintf_format_type 3036 || info.format_type == gcc_gfc_format_type 3037 || info.format_type == gcc_diag_format_type 3038 || info.format_type == gcc_tdiag_format_type 3039 || info.format_type == gcc_cdiag_format_type 3040 || info.format_type == gcc_cxxdiag_format_type) 3041 { 3042 /* Our first time through, we have to make sure that our 3043 format_type data is allocated dynamically and is modifiable. */ 3044 if (!dynamic_format_types) 3045 format_types = dynamic_format_types = (format_kind_info *) 3046 xmemdup (format_types_orig, sizeof (format_types_orig), 3047 sizeof (format_types_orig)); 3048 3049 /* If this is format __asm_fprintf__, we have to initialize 3050 GCC's notion of HOST_WIDE_INT for checking %wd. */ 3051 if (info.format_type == asm_fprintf_format_type) 3052 init_dynamic_asm_fprintf_info (); 3053 /* If this is format __gcc_gfc__, we have to initialize GCC's 3054 notion of 'locus' at runtime for %L. */ 3055 else if (info.format_type == gcc_gfc_format_type) 3056 init_dynamic_gfc_info (); 3057 /* If this is one of the diagnostic attributes, then we have to 3058 initialize 'location_t' and 'tree' at runtime. */ 3059 else if (info.format_type == gcc_diag_format_type 3060 || info.format_type == gcc_tdiag_format_type 3061 || info.format_type == gcc_cdiag_format_type 3062 || info.format_type == gcc_cxxdiag_format_type) 3063 init_dynamic_diag_info (); 3064 else 3065 gcc_unreachable (); 3066 } 3067 3068 return NULL_TREE; 3069 } 3070