1 /* Check calls to formatted I/O functions (-Wformat). 2 Copyright (C) 1992-2018 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #include "config.h" 21 #include "system.h" 22 #include "coretypes.h" 23 #include "tm.h" 24 #include "c-target.h" 25 #include "c-common.h" 26 #include "alloc-pool.h" 27 #include "stringpool.h" 28 #include "c-objc.h" 29 #include "intl.h" 30 #include "langhooks.h" 31 #include "c-format.h" 32 #include "diagnostic.h" 33 #include "substring-locations.h" 34 #include "selftest.h" 35 #include "builtins.h" 36 #include "attribs.h" 37 38 /* Handle attributes associated with format checking. */ 39 40 /* This must be in the same order as format_types, except for 41 format_type_error. Target-specific format types do not have 42 matching enum values. */ 43 enum format_type { printf_format_type, asm_fprintf_format_type, 44 gcc_diag_format_type, gcc_tdiag_format_type, 45 gcc_cdiag_format_type, 46 gcc_cxxdiag_format_type, gcc_gfc_format_type, 47 gcc_objc_string_format_type, 48 format_type_error = -1}; 49 50 struct function_format_info 51 { 52 int format_type; /* type of format (printf, scanf, etc.) */ 53 unsigned HOST_WIDE_INT format_num; /* number of format argument */ 54 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */ 55 }; 56 57 /* Initialized in init_dynamic_diag_info. */ 58 static GTY(()) tree local_tree_type_node; 59 static GTY(()) tree local_gcall_ptr_node; 60 static GTY(()) tree locus; 61 62 static bool decode_format_attr (tree, function_format_info *, int); 63 static int decode_format_type (const char *); 64 65 static bool check_format_string (tree argument, 66 unsigned HOST_WIDE_INT format_num, 67 int flags, bool *no_add_attrs, 68 int expected_format_type); 69 static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value, 70 int validated_p); 71 static const char *convert_format_name_to_system_name (const char *attr_name); 72 73 static int first_target_format_type; 74 static const char *format_name (int format_num); 75 static int format_flags (int format_num); 76 77 /* Emit a warning as per format_warning_va, but construct the substring_loc 78 for the character at offset (CHAR_IDX - 1) within a string constant 79 FORMAT_STRING_CST at FMT_STRING_LOC. */ 80 81 ATTRIBUTE_GCC_DIAG (5,6) 82 static bool 83 format_warning_at_char (location_t fmt_string_loc, tree format_string_cst, 84 int char_idx, int opt, const char *gmsgid, ...) 85 { 86 va_list ap; 87 va_start (ap, gmsgid); 88 tree string_type = TREE_TYPE (format_string_cst); 89 90 /* The callers are of the form: 91 format_warning (format_string_loc, format_string_cst, 92 format_chars - orig_format_chars, 93 where format_chars has already been incremented, so that 94 CHAR_IDX is one character beyond where the warning should 95 be emitted. Fix it. */ 96 char_idx -= 1; 97 98 substring_loc fmt_loc (fmt_string_loc, string_type, char_idx, char_idx, 99 char_idx); 100 bool warned = format_warning_va (fmt_loc, UNKNOWN_LOCATION, NULL, opt, 101 gmsgid, &ap); 102 va_end (ap); 103 104 return warned; 105 } 106 107 /* Check that we have a pointer to a string suitable for use as a format. 108 The default is to check for a char type. 109 For objective-c dialects, this is extended to include references to string 110 objects validated by objc_string_ref_type_p (). 111 Targets may also provide a string object type that can be used within c and 112 c++ and shared with their respective objective-c dialects. In this case the 113 reference to a format string is checked for validity via a hook. 114 115 The function returns true if strref points to any string type valid for the 116 language dialect and target. */ 117 118 static bool 119 valid_stringptr_type_p (tree strref) 120 { 121 return (strref != NULL 122 && TREE_CODE (strref) == POINTER_TYPE 123 && (TYPE_MAIN_VARIANT (TREE_TYPE (strref)) == char_type_node 124 || objc_string_ref_type_p (strref) 125 || (*targetcm.string_object_ref_type_p) ((const_tree) strref))); 126 } 127 128 /* Handle a "format_arg" attribute; arguments as in 129 struct attribute_spec.handler. */ 130 tree 131 handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name), 132 tree args, int flags, bool *no_add_attrs) 133 { 134 tree type = *node; 135 tree format_num_expr = TREE_VALUE (args); 136 unsigned HOST_WIDE_INT format_num = 0; 137 138 if (!get_constant (format_num_expr, &format_num, 0)) 139 { 140 error ("format string has invalid operand number"); 141 *no_add_attrs = true; 142 return NULL_TREE; 143 } 144 145 if (prototype_p (type)) 146 { 147 /* The format arg can be any string reference valid for the language and 148 target. We cannot be more specific in this case. */ 149 if (!check_format_string (type, format_num, flags, no_add_attrs, -1)) 150 return NULL_TREE; 151 } 152 153 if (!valid_stringptr_type_p (TREE_TYPE (type))) 154 { 155 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 156 error ("function does not return string type"); 157 *no_add_attrs = true; 158 return NULL_TREE; 159 } 160 161 return NULL_TREE; 162 } 163 164 /* Verify that the format_num argument is actually a string reference suitable, 165 for the language dialect and target (in case the format attribute is in 166 error). When we know the specific reference type expected, this is also 167 checked. */ 168 static bool 169 check_format_string (tree fntype, unsigned HOST_WIDE_INT format_num, 170 int flags, bool *no_add_attrs, int expected_format_type) 171 { 172 unsigned HOST_WIDE_INT i; 173 bool is_objc_sref, is_target_sref, is_char_ref; 174 tree ref; 175 int fmt_flags; 176 function_args_iterator iter; 177 178 i = 1; 179 FOREACH_FUNCTION_ARGS (fntype, ref, iter) 180 { 181 if (i == format_num) 182 break; 183 i++; 184 } 185 186 if (!ref 187 || !valid_stringptr_type_p (ref)) 188 { 189 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 190 error ("format string argument is not a string type"); 191 *no_add_attrs = true; 192 return false; 193 } 194 195 /* We only know that we want a suitable string reference. */ 196 if (expected_format_type < 0) 197 return true; 198 199 /* Now check that the arg matches the expected type. */ 200 is_char_ref = 201 (TYPE_MAIN_VARIANT (TREE_TYPE (ref)) == char_type_node); 202 203 fmt_flags = format_flags (expected_format_type); 204 is_objc_sref = is_target_sref = false; 205 if (!is_char_ref) 206 is_objc_sref = objc_string_ref_type_p (ref); 207 208 if (!(fmt_flags & FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL)) 209 { 210 if (is_char_ref) 211 return true; /* OK, we expected a char and found one. */ 212 else 213 { 214 /* We expected a char but found an extended string type. */ 215 if (is_objc_sref) 216 error ("found a %qs reference but the format argument should" 217 " be a string", format_name (gcc_objc_string_format_type)); 218 else 219 error ("found a %qT but the format argument should be a string", 220 ref); 221 *no_add_attrs = true; 222 return false; 223 } 224 } 225 226 /* We expect a string object type as the format arg. */ 227 if (is_char_ref) 228 { 229 error ("format argument should be a %qs reference but" 230 " a string was found", format_name (expected_format_type)); 231 *no_add_attrs = true; 232 return false; 233 } 234 235 /* We will assert that objective-c will support either its own string type 236 or the target-supplied variant. */ 237 if (!is_objc_sref) 238 is_target_sref = (*targetcm.string_object_ref_type_p) ((const_tree) ref); 239 240 if (expected_format_type == (int) gcc_objc_string_format_type 241 && (is_objc_sref || is_target_sref)) 242 return true; 243 244 /* We will allow a target string ref to match only itself. */ 245 if (first_target_format_type 246 && expected_format_type >= first_target_format_type 247 && is_target_sref) 248 return true; 249 else 250 { 251 error ("format argument should be a %qs reference", 252 format_name (expected_format_type)); 253 *no_add_attrs = true; 254 return false; 255 } 256 257 gcc_unreachable (); 258 } 259 260 /* Verify EXPR is a constant, and store its value. 261 If validated_p is true there should be no errors. 262 Returns true on success, false otherwise. */ 263 static bool 264 get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p) 265 { 266 if (!tree_fits_uhwi_p (expr)) 267 { 268 gcc_assert (!validated_p); 269 return false; 270 } 271 272 *value = TREE_INT_CST_LOW (expr); 273 274 return true; 275 } 276 277 /* Decode the arguments to a "format" attribute into a 278 function_format_info structure. It is already known that the list 279 is of the right length. If VALIDATED_P is true, then these 280 attributes have already been validated and must not be erroneous; 281 if false, it will give an error message. Returns true if the 282 attributes are successfully decoded, false otherwise. */ 283 284 static bool 285 decode_format_attr (tree args, function_format_info *info, int validated_p) 286 { 287 tree format_type_id = TREE_VALUE (args); 288 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args)); 289 tree first_arg_num_expr 290 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args))); 291 292 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE) 293 { 294 gcc_assert (!validated_p); 295 error ("unrecognized format specifier"); 296 return false; 297 } 298 else 299 { 300 const char *p = IDENTIFIER_POINTER (format_type_id); 301 302 p = convert_format_name_to_system_name (p); 303 304 info->format_type = decode_format_type (p); 305 306 if (!c_dialect_objc () 307 && info->format_type == gcc_objc_string_format_type) 308 { 309 gcc_assert (!validated_p); 310 warning (OPT_Wformat_, "%qE is only allowed in Objective-C dialects", 311 format_type_id); 312 info->format_type = format_type_error; 313 return false; 314 } 315 316 if (info->format_type == format_type_error) 317 { 318 gcc_assert (!validated_p); 319 warning (OPT_Wformat_, "%qE is an unrecognized format function type", 320 format_type_id); 321 return false; 322 } 323 } 324 325 if (!get_constant (format_num_expr, &info->format_num, validated_p)) 326 { 327 error ("format string has invalid operand number"); 328 return false; 329 } 330 331 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p)) 332 { 333 error ("%<...%> has invalid operand number"); 334 return false; 335 } 336 337 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num) 338 { 339 gcc_assert (!validated_p); 340 error ("format string argument follows the args to be formatted"); 341 return false; 342 } 343 344 return true; 345 } 346 347 /* Check a call to a format function against a parameter list. */ 348 349 /* The C standard version C++ is treated as equivalent to 350 or inheriting from, for the purpose of format features supported. */ 351 #define CPLUSPLUS_STD_VER (cxx_dialect < cxx11 ? STD_C94 : STD_C99) 352 /* The C standard version we are checking formats against when pedantic. */ 353 #define C_STD_VER ((int) (c_dialect_cxx () \ 354 ? CPLUSPLUS_STD_VER \ 355 : (flag_isoc99 \ 356 ? STD_C99 \ 357 : (flag_isoc94 ? STD_C94 : STD_C89)))) 358 /* The name to give to the standard version we are warning about when 359 pedantic. FEATURE_VER is the version in which the feature warned out 360 appeared, which is higher than C_STD_VER. */ 361 #define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \ 362 ? (cxx_dialect < cxx11 ? "ISO C++98" \ 363 : "ISO C++11") \ 364 : ((FEATURE_VER) == STD_EXT \ 365 ? "ISO C" \ 366 : "ISO C90")) 367 /* Adjust a C standard version, which may be STD_C9L, to account for 368 -Wno-long-long. Returns other standard versions unchanged. */ 369 #define ADJ_STD(VER) ((int) ((VER) == STD_C9L \ 370 ? (warn_long_long ? STD_C99 : STD_C89) \ 371 : (VER))) 372 373 /* Enum describing the kind of specifiers present in the format and 374 requiring an argument. */ 375 enum format_specifier_kind { 376 CF_KIND_FORMAT, 377 CF_KIND_FIELD_WIDTH, 378 CF_KIND_FIELD_PRECISION 379 }; 380 381 static const char *kind_descriptions[] = { 382 N_("format"), 383 N_("field width specifier"), 384 N_("field precision specifier") 385 }; 386 387 /* Structure describing details of a type expected in format checking, 388 and the type to check against it. */ 389 struct format_wanted_type 390 { 391 /* The type wanted. */ 392 tree wanted_type; 393 /* The name of this type to use in diagnostics. */ 394 const char *wanted_type_name; 395 /* Should be type checked just for scalar width identity. */ 396 int scalar_identity_flag; 397 /* The level of indirection through pointers at which this type occurs. */ 398 int pointer_count; 399 /* Whether, when pointer_count is 1, to allow any character type when 400 pedantic, rather than just the character or void type specified. */ 401 int char_lenient_flag; 402 /* Whether the argument, dereferenced once, is written into and so the 403 argument must not be a pointer to a const-qualified type. */ 404 int writing_in_flag; 405 /* Whether the argument, dereferenced once, is read from and so 406 must not be a NULL pointer. */ 407 int reading_from_flag; 408 /* The kind of specifier that this type is used for. */ 409 enum format_specifier_kind kind; 410 /* The starting character of the specifier. This never includes the 411 initial percent sign. */ 412 const char *format_start; 413 /* The length of the specifier. */ 414 int format_length; 415 /* The actual parameter to check against the wanted type. */ 416 tree param; 417 /* The argument number of that parameter. */ 418 int arg_num; 419 /* The offset location of this argument with respect to the format 420 string location. */ 421 unsigned int offset_loc; 422 /* The next type to check for this format conversion, or NULL if none. */ 423 struct format_wanted_type *next; 424 }; 425 426 /* Convenience macro for format_length_info meaning unused. */ 427 #define NO_FMT NULL, FMT_LEN_none, STD_C89 428 429 static const format_length_info printf_length_specs[] = 430 { 431 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 }, 432 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 }, 433 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 }, 434 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 }, 435 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 }, 436 { "Z", FMT_LEN_z, STD_EXT, NO_FMT, 0 }, 437 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 }, 438 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 }, 439 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 }, 440 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 }, 441 { NO_FMT, NO_FMT, 0 } 442 }; 443 444 /* Length specifiers valid for asm_fprintf. */ 445 static const format_length_info asm_fprintf_length_specs[] = 446 { 447 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 }, 448 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 }, 449 { NO_FMT, NO_FMT, 0 } 450 }; 451 452 /* Length specifiers valid for GCC diagnostics. */ 453 static const format_length_info gcc_diag_length_specs[] = 454 { 455 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 }, 456 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 }, 457 { NO_FMT, NO_FMT, 0 } 458 }; 459 460 /* The custom diagnostics all accept the same length specifiers. */ 461 #define gcc_tdiag_length_specs gcc_diag_length_specs 462 #define gcc_cdiag_length_specs gcc_diag_length_specs 463 #define gcc_cxxdiag_length_specs gcc_diag_length_specs 464 465 /* This differs from printf_length_specs only in that "Z" is not accepted. */ 466 static const format_length_info scanf_length_specs[] = 467 { 468 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 }, 469 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 }, 470 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 }, 471 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 }, 472 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 }, 473 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 }, 474 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 }, 475 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 }, 476 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 }, 477 { NO_FMT, NO_FMT, 0 } 478 }; 479 480 481 /* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings 482 make no sense for a format type not part of any C standard version. */ 483 static const format_length_info strfmon_length_specs[] = 484 { 485 /* A GNU extension. */ 486 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 }, 487 { NO_FMT, NO_FMT, 0 } 488 }; 489 490 491 /* For now, the Fortran front-end routines only use l as length modifier. */ 492 static const format_length_info gcc_gfc_length_specs[] = 493 { 494 { "l", FMT_LEN_l, STD_C89, NO_FMT, 0 }, 495 { NO_FMT, NO_FMT, 0 } 496 }; 497 498 499 static const format_flag_spec printf_flag_specs[] = 500 { 501 { ' ', 0, 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 }, 502 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 503 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 504 { '0', 0, 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 }, 505 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 }, 506 { '\'', 0, 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT }, 507 { 'I', 0, 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT }, 508 { 'w', 0, 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 }, 509 { 'p', 0, 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 510 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 511 { 0, 0, 0, 0, NULL, NULL, STD_C89 } 512 }; 513 514 515 static const format_flag_pair printf_flag_pairs[] = 516 { 517 { ' ', '+', 1, 0 }, 518 { '0', '-', 1, 0 }, 519 { '0', 'p', 1, 'i' }, 520 { 0, 0, 0, 0 } 521 }; 522 523 static const format_flag_spec asm_fprintf_flag_specs[] = 524 { 525 { ' ', 0, 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 }, 526 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 527 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 528 { '0', 0, 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 }, 529 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 }, 530 { 'w', 0, 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 }, 531 { 'p', 0, 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 532 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 533 { 0, 0, 0, 0, NULL, NULL, STD_C89 } 534 }; 535 536 static const format_flag_pair asm_fprintf_flag_pairs[] = 537 { 538 { ' ', '+', 1, 0 }, 539 { '0', '-', 1, 0 }, 540 { '0', 'p', 1, 'i' }, 541 { 0, 0, 0, 0 } 542 }; 543 544 static const format_flag_pair gcc_diag_flag_pairs[] = 545 { 546 { 0, 0, 0, 0 } 547 }; 548 549 #define gcc_tdiag_flag_pairs gcc_diag_flag_pairs 550 #define gcc_cdiag_flag_pairs gcc_diag_flag_pairs 551 #define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs 552 #define gcc_gfc_flag_pairs gcc_diag_flag_pairs 553 554 static const format_flag_spec gcc_diag_flag_specs[] = 555 { 556 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 557 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 558 { 'q', 0, 0, 1, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 }, 559 { 'p', 0, 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 560 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 561 { 0, 0, 0, 0, NULL, NULL, STD_C89 } 562 }; 563 564 #define gcc_tdiag_flag_specs gcc_diag_flag_specs 565 #define gcc_cdiag_flag_specs gcc_diag_flag_specs 566 #define gcc_cxxdiag_flag_specs gcc_diag_flag_specs 567 #define gcc_gfc_flag_specs gcc_diag_flag_specs 568 569 static const format_flag_spec scanf_flag_specs[] = 570 { 571 { '*', 0, 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 }, 572 { 'a', 0, 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT }, 573 { 'm', 0, 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT }, 574 { 'w', 0, 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 }, 575 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 }, 576 { '\'', 0, 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT }, 577 { 'I', 0, 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT }, 578 { 0, 0, 0, 0, NULL, NULL, STD_C89 } 579 }; 580 581 582 static const format_flag_pair scanf_flag_pairs[] = 583 { 584 { '*', 'L', 0, 0 }, 585 { 'a', 'm', 0, 0 }, 586 { 0, 0, 0, 0 } 587 }; 588 589 590 static const format_flag_spec strftime_flag_specs[] = 591 { 592 { '_', 0, 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT }, 593 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT }, 594 { '0', 0, 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT }, 595 { '^', 0, 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT }, 596 { '#', 0, 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT }, 597 { 'w', 0, 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT }, 598 { 'E', 0, 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 }, 599 { 'O', 0, 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 }, 600 { 'O', 'o', 0, 0, NULL, N_("the 'O' modifier"), STD_EXT }, 601 { 0, 0, 0, 0, NULL, NULL, STD_C89 } 602 }; 603 604 605 static const format_flag_pair strftime_flag_pairs[] = 606 { 607 { 'E', 'O', 0, 0 }, 608 { '_', '-', 0, 0 }, 609 { '_', '0', 0, 0 }, 610 { '-', '0', 0, 0 }, 611 { '^', '#', 0, 0 }, 612 { 0, 0, 0, 0 } 613 }; 614 615 616 static const format_flag_spec strfmon_flag_specs[] = 617 { 618 { '=', 0, 1, 0, N_("fill character"), N_("fill character in strfmon format"), STD_C89 }, 619 { '^', 0, 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 }, 620 { '+', 0, 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 }, 621 { '(', 0, 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 }, 622 { '!', 0, 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 }, 623 { '-', 0, 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 }, 624 { 'w', 0, 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 }, 625 { '#', 0, 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 }, 626 { 'p', 0, 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 }, 627 { 'L', 0, 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 }, 628 { 0, 0, 0, 0, NULL, NULL, STD_C89 } 629 }; 630 631 static const format_flag_pair strfmon_flag_pairs[] = 632 { 633 { '+', '(', 0, 0 }, 634 { 0, 0, 0, 0 } 635 }; 636 637 638 static const format_char_info print_char_table[] = 639 { 640 /* C89 conversion specifiers. */ 641 { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "-wp0 +'I", "i", NULL }, 642 { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL }, 643 { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "-wp0'I", "i", NULL }, 644 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#'I", "", NULL }, 645 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#I", "", NULL }, 646 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 647 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL }, 648 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL }, 649 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "", "W", NULL }, 650 /* C99 conversion specifiers. */ 651 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "-wp0 +#'I", "", NULL }, 652 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL }, 653 /* X/Open conversion specifiers. */ 654 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 655 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL }, 656 /* GNU conversion specifiers. */ 657 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL }, 658 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 659 }; 660 661 static const format_char_info asm_fprintf_char_table[] = 662 { 663 /* C89 conversion specifiers. */ 664 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL }, 665 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL }, 666 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL }, 667 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 668 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL }, 669 670 /* asm_fprintf conversion specifiers. */ 671 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 672 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 673 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 674 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 675 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 676 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 677 { "z", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 678 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 679 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 680 }; 681 682 static const format_char_info gcc_diag_char_table[] = 683 { 684 /* C89 conversion specifiers. */ 685 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 686 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 687 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 688 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 689 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 690 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 691 692 /* Custom conversion specifiers. */ 693 694 /* G requires a "gcall*" argument at runtime. */ 695 { "G", 1, STD_C89, { T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 696 /* K requires a "tree" argument at runtime. */ 697 { "K", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 698 699 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "//cR", NULL }, 700 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL }, 701 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL }, 702 { "'" , 0, STD_C89, NOARGUMENTS, "", "", NULL }, 703 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL }, 704 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 705 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 706 }; 707 708 static const format_char_info gcc_tdiag_char_table[] = 709 { 710 /* C89 conversion specifiers. */ 711 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 712 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 713 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 714 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 715 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 716 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 717 718 /* Custom conversion specifiers. */ 719 720 /* These will require a "tree" at runtime. */ 721 { "DFTV", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "'", NULL }, 722 { "E", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 723 { "K", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 724 725 /* G requires a "gcall*" argument at runtime. */ 726 { "G", 1, STD_C89, { T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 727 728 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL }, 729 730 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "/cR", NULL }, 731 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL }, 732 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL }, 733 { "'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 734 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL }, 735 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 736 { "Z", 1, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", &gcc_tdiag_char_table[0] }, 737 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 738 }; 739 740 static const format_char_info gcc_cdiag_char_table[] = 741 { 742 /* C89 conversion specifiers. */ 743 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 744 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 745 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 746 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 747 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 748 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 749 750 /* Custom conversion specifiers. */ 751 752 /* These will require a "tree" at runtime. */ 753 { "DFTV", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "'", NULL }, 754 { "E", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 755 { "K", 1, STD_C89, { T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 756 757 /* G requires a "gcall*" argument at runtime. */ 758 { "G", 1, STD_C89, { T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 759 760 { "v", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL }, 761 762 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "/cR", NULL }, 763 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL }, 764 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL }, 765 { "'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 766 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL }, 767 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 768 { "Z", 1, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", &gcc_tdiag_char_table[0] }, 769 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 770 }; 771 772 static const format_char_info gcc_cxxdiag_char_table[] = 773 { 774 /* C89 conversion specifiers. */ 775 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 776 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 777 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 778 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 779 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 780 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 781 782 /* Custom conversion specifiers. */ 783 784 /* These will require a "tree" at runtime. */ 785 { "ADFHISTVX",1,STD_C89,{ T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "'", NULL }, 786 { "E", 1,STD_C89,{ T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL }, 787 { "K", 1, STD_C89,{ T89_T, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 788 { "v", 0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q#", "", NULL }, 789 790 /* G requires a "gcall*" argument at runtime. */ 791 { "G", 1, STD_C89,{ T89_G, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "\"", NULL }, 792 793 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */ 794 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 795 796 { "r", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "/cR", NULL }, 797 { "<", 0, STD_C89, NOARGUMENTS, "", "<", NULL }, 798 { ">", 0, STD_C89, NOARGUMENTS, "", ">", NULL }, 799 { "'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 800 { "R", 0, STD_C89, NOARGUMENTS, "", "\\", NULL }, 801 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 802 { "Z", 1, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", &gcc_tdiag_char_table[0] }, 803 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 804 }; 805 806 static const format_char_info gcc_gfc_char_table[] = 807 { 808 /* C89 conversion specifiers. */ 809 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 810 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 811 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 812 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "cR", NULL }, 813 814 /* gfc conversion specifiers. */ 815 816 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 817 818 /* This will require a "locus" at runtime. */ 819 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL }, 820 821 /* These will require nothing. */ 822 { "<>",0, STD_C89, NOARGUMENTS, "", "", NULL }, 823 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 824 }; 825 826 static const format_char_info scan_char_table[] = 827 { 828 /* C89 conversion specifiers. */ 829 { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, TEX_LL, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "*w'I", "W", NULL }, 830 { "u", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "*w'I", "W", NULL }, 831 { "oxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T9L_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL }, 832 { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "*w'", "W", NULL }, 833 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL }, 834 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL }, 835 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL }, 836 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL }, 837 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T9L_LL, BADLEN, T99_SST, T99_PD, T99_IM, BADLEN, BADLEN, BADLEN }, "", "W", NULL }, 838 /* C99 conversion specifiers. */ 839 { "F", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, TEX_D32, TEX_D64, TEX_D128 }, "*w'", "W", NULL }, 840 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL }, 841 /* X/Open conversion specifiers. */ 842 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL }, 843 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL }, 844 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 845 }; 846 847 static const format_char_info time_char_table[] = 848 { 849 /* C89 conversion specifiers. */ 850 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL }, 851 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL }, 852 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL }, 853 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL }, 854 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL }, 855 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL }, 856 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL }, 857 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL }, 858 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL }, 859 /* C99 conversion specifiers. */ 860 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL }, 861 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL }, 862 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL }, 863 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL }, 864 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL }, 865 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL }, 866 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL }, 867 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL }, 868 /* GNU conversion specifiers. */ 869 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL }, 870 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL }, 871 #if 1 /* DragonFly base: strftime() %+ specifier. */ 872 { "+", 0, STD_EXT, NOLENGTHS, "E", "3", NULL }, 873 #endif 874 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 875 }; 876 877 static const format_char_info monetary_char_table[] = 878 { 879 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL }, 880 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 881 }; 882 883 /* This must be in the same order as enum format_type. */ 884 static const format_kind_info format_types_orig[] = 885 { 886 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL, 887 printf_flag_specs, printf_flag_pairs, 888 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK, 889 'w', 0, 'p', 0, 'L', 0, 890 &integer_type_node, &integer_type_node 891 }, 892 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL, 893 asm_fprintf_flag_specs, asm_fprintf_flag_pairs, 894 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK, 895 'w', 0, 'p', 0, 'L', 0, 896 NULL, NULL 897 }, 898 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+#", NULL, 899 gcc_diag_flag_specs, gcc_diag_flag_pairs, 900 FMT_FLAG_ARG_CONVERT, 901 0, 0, 'p', 0, 'L', 0, 902 NULL, &integer_type_node 903 }, 904 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+#", NULL, 905 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs, 906 FMT_FLAG_ARG_CONVERT, 907 0, 0, 'p', 0, 'L', 0, 908 NULL, &integer_type_node 909 }, 910 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+#", NULL, 911 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs, 912 FMT_FLAG_ARG_CONVERT, 913 0, 0, 'p', 0, 'L', 0, 914 NULL, &integer_type_node 915 }, 916 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL, 917 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs, 918 FMT_FLAG_ARG_CONVERT, 919 0, 0, 'p', 0, 'L', 0, 920 NULL, &integer_type_node 921 }, 922 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "q+#", NULL, 923 gcc_gfc_flag_specs, gcc_gfc_flag_pairs, 924 FMT_FLAG_ARG_CONVERT, 925 0, 0, 0, 0, 0, 0, 926 NULL, NULL 927 }, 928 { "NSString", NULL, NULL, NULL, NULL, 929 NULL, NULL, 930 FMT_FLAG_ARG_CONVERT|FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL, 0, 0, 0, 0, 0, 0, 931 NULL, NULL 932 }, 933 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL, 934 scanf_flag_specs, scanf_flag_pairs, 935 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK, 936 'w', 0, 0, '*', 'L', 'm', 937 NULL, NULL 938 }, 939 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO", 940 strftime_flag_specs, strftime_flag_pairs, 941 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0, 942 NULL, NULL 943 }, 944 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL, 945 strfmon_flag_specs, strfmon_flag_pairs, 946 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0, 947 NULL, NULL 948 } 949 }; 950 951 /* This layer of indirection allows GCC to reassign format_types with 952 new data if necessary, while still allowing the original data to be 953 const. */ 954 static const format_kind_info *format_types = format_types_orig; 955 /* We can modify this one. We also add target-specific format types 956 to the end of the array. */ 957 static format_kind_info *dynamic_format_types; 958 959 static int n_format_types = ARRAY_SIZE (format_types_orig); 960 961 /* Structure detailing the results of checking a format function call 962 where the format expression may be a conditional expression with 963 many leaves resulting from nested conditional expressions. */ 964 struct format_check_results 965 { 966 /* Number of leaves of the format argument that could not be checked 967 as they were not string literals. */ 968 int number_non_literal; 969 /* Number of leaves of the format argument that were null pointers or 970 string literals, but had extra format arguments. */ 971 int number_extra_args; 972 location_t extra_arg_loc; 973 /* Number of leaves of the format argument that were null pointers or 974 string literals, but had extra format arguments and used $ operand 975 numbers. */ 976 int number_dollar_extra_args; 977 /* Number of leaves of the format argument that were wide string 978 literals. */ 979 int number_wide; 980 /* Number of leaves of the format argument that were empty strings. */ 981 int number_empty; 982 /* Number of leaves of the format argument that were unterminated 983 strings. */ 984 int number_unterminated; 985 /* Number of leaves of the format argument that were not counted above. */ 986 int number_other; 987 /* Location of the format string. */ 988 location_t format_string_loc; 989 }; 990 991 struct format_check_context 992 { 993 format_check_results *res; 994 function_format_info *info; 995 tree params; 996 vec<location_t> *arglocs; 997 }; 998 999 /* Return the format name (as specified in the original table) for the format 1000 type indicated by format_num. */ 1001 static const char * 1002 format_name (int format_num) 1003 { 1004 if (format_num >= 0 && format_num < n_format_types) 1005 return format_types[format_num].name; 1006 gcc_unreachable (); 1007 } 1008 1009 /* Return the format flags (as specified in the original table) for the format 1010 type indicated by format_num. */ 1011 static int 1012 format_flags (int format_num) 1013 { 1014 if (format_num >= 0 && format_num < n_format_types) 1015 return format_types[format_num].flags; 1016 gcc_unreachable (); 1017 } 1018 1019 static void check_format_info (function_format_info *, tree, 1020 vec<location_t> *); 1021 static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT); 1022 static void check_format_info_main (format_check_results *, 1023 function_format_info *, const char *, 1024 location_t, tree, 1025 int, tree, 1026 unsigned HOST_WIDE_INT, 1027 object_allocator<format_wanted_type> &, 1028 vec<location_t> *); 1029 1030 static void init_dollar_format_checking (int, tree); 1031 static int maybe_read_dollar_number (const char **, int, 1032 tree, tree *, const format_kind_info *); 1033 static bool avoid_dollar_number (const char *); 1034 static void finish_dollar_format_checking (format_check_results *, int); 1035 1036 static const format_flag_spec *get_flag_spec (const format_flag_spec *, 1037 int, const char *); 1038 1039 static void check_format_types (const substring_loc &fmt_loc, 1040 format_wanted_type *, 1041 const format_kind_info *fki, 1042 int offset_to_type_start, 1043 char conversion_char, 1044 vec<location_t> *arglocs); 1045 static void format_type_warning (const substring_loc &fmt_loc, 1046 location_t param_loc, 1047 format_wanted_type *, tree, 1048 tree, 1049 const format_kind_info *fki, 1050 int offset_to_type_start, 1051 char conversion_char); 1052 1053 /* Decode a format type from a string, returning the type, or 1054 format_type_error if not valid, in which case the caller should print an 1055 error message. */ 1056 static int 1057 decode_format_type (const char *s) 1058 { 1059 int i; 1060 int slen; 1061 1062 s = convert_format_name_to_system_name (s); 1063 slen = strlen (s); 1064 for (i = 0; i < n_format_types; i++) 1065 { 1066 int alen; 1067 if (!strcmp (s, format_types[i].name)) 1068 return i; 1069 alen = strlen (format_types[i].name); 1070 if (slen == alen + 4 && s[0] == '_' && s[1] == '_' 1071 && s[slen - 1] == '_' && s[slen - 2] == '_' 1072 && !strncmp (s + 2, format_types[i].name, alen)) 1073 return i; 1074 } 1075 return format_type_error; 1076 } 1077 1078 1079 /* Check the argument list of a call to printf, scanf, etc. 1080 ATTRS are the attributes on the function type. There are NARGS argument 1081 values in the array ARGARRAY. 1082 Also, if -Wsuggest-attribute=format, 1083 warn for calls to vprintf or vscanf in functions with no such format 1084 attribute themselves. */ 1085 1086 void 1087 check_function_format (tree attrs, int nargs, tree *argarray, 1088 vec<location_t> *arglocs) 1089 { 1090 tree a; 1091 1092 /* See if this function has any format attributes. */ 1093 for (a = attrs; a; a = TREE_CHAIN (a)) 1094 { 1095 if (is_attribute_p ("format", TREE_PURPOSE (a))) 1096 { 1097 /* Yup; check it. */ 1098 function_format_info info; 1099 decode_format_attr (TREE_VALUE (a), &info, /*validated=*/true); 1100 if (warn_format) 1101 { 1102 /* FIXME: Rewrite all the internal functions in this file 1103 to use the ARGARRAY directly instead of constructing this 1104 temporary list. */ 1105 tree params = NULL_TREE; 1106 int i; 1107 for (i = nargs - 1; i >= 0; i--) 1108 params = tree_cons (NULL_TREE, argarray[i], params); 1109 check_format_info (&info, params, arglocs); 1110 } 1111 1112 /* Attempt to detect whether the current function might benefit 1113 from the format attribute if the called function is decorated 1114 with it. Avoid using calls with string literal formats for 1115 guidance since those are unlikely to be viable candidates. */ 1116 if (warn_suggest_attribute_format 1117 && current_function_decl != NULL_TREE 1118 && info.first_arg_num == 0 1119 && (format_types[info.format_type].flags 1120 & (int) FMT_FLAG_ARG_CONVERT) 1121 /* c_strlen will fail for a function parameter but succeed 1122 for a literal or constant array. */ 1123 && !c_strlen (argarray[info.format_num - 1], 1)) 1124 { 1125 tree c; 1126 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl)); 1127 c; 1128 c = TREE_CHAIN (c)) 1129 if (is_attribute_p ("format", TREE_PURPOSE (c)) 1130 && (decode_format_type (IDENTIFIER_POINTER 1131 (TREE_VALUE (TREE_VALUE (c)))) 1132 == info.format_type)) 1133 break; 1134 if (c == NULL_TREE) 1135 { 1136 /* Check if the current function has a parameter to which 1137 the format attribute could be attached; if not, it 1138 can't be a candidate for a format attribute, despite 1139 the vprintf-like or vscanf-like call. */ 1140 tree args; 1141 for (args = DECL_ARGUMENTS (current_function_decl); 1142 args != 0; 1143 args = DECL_CHAIN (args)) 1144 { 1145 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE 1146 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args))) 1147 == char_type_node)) 1148 break; 1149 } 1150 if (args != 0) 1151 warning (OPT_Wsuggest_attribute_format, "function %qD " 1152 "might be a candidate for %qs format attribute", 1153 current_function_decl, 1154 format_types[info.format_type].name); 1155 } 1156 } 1157 } 1158 } 1159 } 1160 1161 1162 /* Variables used by the checking of $ operand number formats. */ 1163 static char *dollar_arguments_used = NULL; 1164 static char *dollar_arguments_pointer_p = NULL; 1165 static int dollar_arguments_alloc = 0; 1166 static int dollar_arguments_count; 1167 static int dollar_first_arg_num; 1168 static int dollar_max_arg_used; 1169 static int dollar_format_warned; 1170 1171 /* Initialize the checking for a format string that may contain $ 1172 parameter number specifications; we will need to keep track of whether 1173 each parameter has been used. FIRST_ARG_NUM is the number of the first 1174 argument that is a parameter to the format, or 0 for a vprintf-style 1175 function; PARAMS is the list of arguments starting at this argument. */ 1176 1177 static void 1178 init_dollar_format_checking (int first_arg_num, tree params) 1179 { 1180 tree oparams = params; 1181 1182 dollar_first_arg_num = first_arg_num; 1183 dollar_arguments_count = 0; 1184 dollar_max_arg_used = 0; 1185 dollar_format_warned = 0; 1186 if (first_arg_num > 0) 1187 { 1188 while (params) 1189 { 1190 dollar_arguments_count++; 1191 params = TREE_CHAIN (params); 1192 } 1193 } 1194 if (dollar_arguments_alloc < dollar_arguments_count) 1195 { 1196 free (dollar_arguments_used); 1197 free (dollar_arguments_pointer_p); 1198 dollar_arguments_alloc = dollar_arguments_count; 1199 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc); 1200 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc); 1201 } 1202 if (dollar_arguments_alloc) 1203 { 1204 memset (dollar_arguments_used, 0, dollar_arguments_alloc); 1205 if (first_arg_num > 0) 1206 { 1207 int i = 0; 1208 params = oparams; 1209 while (params) 1210 { 1211 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params))) 1212 == POINTER_TYPE); 1213 params = TREE_CHAIN (params); 1214 i++; 1215 } 1216 } 1217 } 1218 } 1219 1220 1221 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED 1222 is set, it is an error if one is not found; otherwise, it is OK. If 1223 such a number is found, check whether it is within range and mark that 1224 numbered operand as being used for later checking. Returns the operand 1225 number if found and within range, zero if no such number was found and 1226 this is OK, or -1 on error. PARAMS points to the first operand of the 1227 format; PARAM_PTR is made to point to the parameter referred to. If 1228 a $ format is found, *FORMAT is updated to point just after it. */ 1229 1230 static int 1231 maybe_read_dollar_number (const char **format, 1232 int dollar_needed, tree params, tree *param_ptr, 1233 const format_kind_info *fki) 1234 { 1235 int argnum; 1236 int overflow_flag; 1237 const char *fcp = *format; 1238 if (!ISDIGIT (*fcp)) 1239 { 1240 if (dollar_needed) 1241 { 1242 warning (OPT_Wformat_, "missing $ operand number in format"); 1243 return -1; 1244 } 1245 else 1246 return 0; 1247 } 1248 argnum = 0; 1249 overflow_flag = 0; 1250 while (ISDIGIT (*fcp)) 1251 { 1252 int nargnum; 1253 nargnum = 10 * argnum + (*fcp - '0'); 1254 if (nargnum < 0 || nargnum / 10 != argnum) 1255 overflow_flag = 1; 1256 argnum = nargnum; 1257 fcp++; 1258 } 1259 if (*fcp != '$') 1260 { 1261 if (dollar_needed) 1262 { 1263 warning (OPT_Wformat_, "missing $ operand number in format"); 1264 return -1; 1265 } 1266 else 1267 return 0; 1268 } 1269 *format = fcp + 1; 1270 if (pedantic && !dollar_format_warned) 1271 { 1272 warning (OPT_Wformat_, "%s does not support %%n$ operand number formats", 1273 C_STD_NAME (STD_EXT)); 1274 dollar_format_warned = 1; 1275 } 1276 if (overflow_flag || argnum == 0 1277 || (dollar_first_arg_num && argnum > dollar_arguments_count)) 1278 { 1279 warning (OPT_Wformat_, "operand number out of range in format"); 1280 return -1; 1281 } 1282 if (argnum > dollar_max_arg_used) 1283 dollar_max_arg_used = argnum; 1284 /* For vprintf-style functions we may need to allocate more memory to 1285 track which arguments are used. */ 1286 while (dollar_arguments_alloc < dollar_max_arg_used) 1287 { 1288 int nalloc; 1289 nalloc = 2 * dollar_arguments_alloc + 16; 1290 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used, 1291 nalloc); 1292 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p, 1293 nalloc); 1294 memset (dollar_arguments_used + dollar_arguments_alloc, 0, 1295 nalloc - dollar_arguments_alloc); 1296 dollar_arguments_alloc = nalloc; 1297 } 1298 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE) 1299 && dollar_arguments_used[argnum - 1] == 1) 1300 { 1301 dollar_arguments_used[argnum - 1] = 2; 1302 warning (OPT_Wformat_, "format argument %d used more than once in %s format", 1303 argnum, fki->name); 1304 } 1305 else 1306 dollar_arguments_used[argnum - 1] = 1; 1307 if (dollar_first_arg_num) 1308 { 1309 int i; 1310 *param_ptr = params; 1311 for (i = 1; i < argnum && *param_ptr != 0; i++) 1312 *param_ptr = TREE_CHAIN (*param_ptr); 1313 1314 /* This case shouldn't be caught here. */ 1315 gcc_assert (*param_ptr); 1316 } 1317 else 1318 *param_ptr = 0; 1319 return argnum; 1320 } 1321 1322 /* Ensure that FORMAT does not start with a decimal number followed by 1323 a $; give a diagnostic and return true if it does, false otherwise. */ 1324 1325 static bool 1326 avoid_dollar_number (const char *format) 1327 { 1328 if (!ISDIGIT (*format)) 1329 return false; 1330 while (ISDIGIT (*format)) 1331 format++; 1332 if (*format == '$') 1333 { 1334 warning (OPT_Wformat_, "$ operand number used after format without operand number"); 1335 return true; 1336 } 1337 return false; 1338 } 1339 1340 1341 /* Finish the checking for a format string that used $ operand number formats 1342 instead of non-$ formats. We check for unused operands before used ones 1343 (a serious error, since the implementation of the format function 1344 can't know what types to pass to va_arg to find the later arguments). 1345 and for unused operands at the end of the format (if we know how many 1346 arguments the format had, so not for vprintf). If there were operand 1347 numbers out of range on a non-vprintf-style format, we won't have reached 1348 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are 1349 pointers. */ 1350 1351 static void 1352 finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok) 1353 { 1354 int i; 1355 bool found_pointer_gap = false; 1356 for (i = 0; i < dollar_max_arg_used; i++) 1357 { 1358 if (!dollar_arguments_used[i]) 1359 { 1360 if (pointer_gap_ok && (dollar_first_arg_num == 0 1361 || dollar_arguments_pointer_p[i])) 1362 found_pointer_gap = true; 1363 else 1364 warning_at (res->format_string_loc, OPT_Wformat_, 1365 "format argument %d unused before used argument %d in $-style format", 1366 i + 1, dollar_max_arg_used); 1367 } 1368 } 1369 if (found_pointer_gap 1370 || (dollar_first_arg_num 1371 && dollar_max_arg_used < dollar_arguments_count)) 1372 { 1373 res->number_other--; 1374 res->number_dollar_extra_args++; 1375 } 1376 } 1377 1378 1379 /* Retrieve the specification for a format flag. SPEC contains the 1380 specifications for format flags for the applicable kind of format. 1381 FLAG is the flag in question. If PREDICATES is NULL, the basic 1382 spec for that flag must be retrieved and must exist. If 1383 PREDICATES is not NULL, it is a string listing possible predicates 1384 for the spec entry; if an entry predicated on any of these is 1385 found, it is returned, otherwise NULL is returned. */ 1386 1387 static const format_flag_spec * 1388 get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates) 1389 { 1390 int i; 1391 for (i = 0; spec[i].flag_char != 0; i++) 1392 { 1393 if (spec[i].flag_char != flag) 1394 continue; 1395 if (predicates != NULL) 1396 { 1397 if (spec[i].predicate != 0 1398 && strchr (predicates, spec[i].predicate) != 0) 1399 return &spec[i]; 1400 } 1401 else if (spec[i].predicate == 0) 1402 return &spec[i]; 1403 } 1404 gcc_assert (predicates); 1405 return NULL; 1406 } 1407 1408 1409 /* Check the argument list of a call to printf, scanf, etc. 1410 INFO points to the function_format_info structure. 1411 PARAMS is the list of argument values. */ 1412 1413 static void 1414 check_format_info (function_format_info *info, tree params, 1415 vec<location_t> *arglocs) 1416 { 1417 format_check_context format_ctx; 1418 unsigned HOST_WIDE_INT arg_num; 1419 tree format_tree; 1420 format_check_results res; 1421 /* Skip to format argument. If the argument isn't available, there's 1422 no work for us to do; prototype checking will catch the problem. */ 1423 for (arg_num = 1; ; ++arg_num) 1424 { 1425 if (params == 0) 1426 return; 1427 if (arg_num == info->format_num) 1428 break; 1429 params = TREE_CHAIN (params); 1430 } 1431 format_tree = TREE_VALUE (params); 1432 params = TREE_CHAIN (params); 1433 if (format_tree == 0) 1434 return; 1435 1436 res.number_non_literal = 0; 1437 res.number_extra_args = 0; 1438 res.extra_arg_loc = UNKNOWN_LOCATION; 1439 res.number_dollar_extra_args = 0; 1440 res.number_wide = 0; 1441 res.number_empty = 0; 1442 res.number_unterminated = 0; 1443 res.number_other = 0; 1444 res.format_string_loc = input_location; 1445 1446 format_ctx.res = &res; 1447 format_ctx.info = info; 1448 format_ctx.params = params; 1449 format_ctx.arglocs = arglocs; 1450 1451 check_function_arguments_recurse (check_format_arg, &format_ctx, 1452 format_tree, arg_num); 1453 1454 location_t loc = format_ctx.res->format_string_loc; 1455 1456 if (res.number_non_literal > 0) 1457 { 1458 /* Functions taking a va_list normally pass a non-literal format 1459 string. These functions typically are declared with 1460 first_arg_num == 0, so avoid warning in those cases. */ 1461 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT)) 1462 { 1463 /* For strftime-like formats, warn for not checking the format 1464 string; but there are no arguments to check. */ 1465 warning_at (loc, OPT_Wformat_nonliteral, 1466 "format not a string literal, format string not checked"); 1467 } 1468 else if (info->first_arg_num != 0) 1469 { 1470 /* If there are no arguments for the format at all, we may have 1471 printf (foo) which is likely to be a security hole. */ 1472 while (arg_num + 1 < info->first_arg_num) 1473 { 1474 if (params == 0) 1475 break; 1476 params = TREE_CHAIN (params); 1477 ++arg_num; 1478 } 1479 if (params == 0 && warn_format_security) 1480 warning_at (loc, OPT_Wformat_security, 1481 "format not a string literal and no format arguments"); 1482 else if (params == 0 && warn_format_nonliteral) 1483 warning_at (loc, OPT_Wformat_nonliteral, 1484 "format not a string literal and no format arguments"); 1485 else 1486 warning_at (loc, OPT_Wformat_nonliteral, 1487 "format not a string literal, argument types not checked"); 1488 } 1489 } 1490 1491 /* If there were extra arguments to the format, normally warn. However, 1492 the standard does say extra arguments are ignored, so in the specific 1493 case where we have multiple leaves (conditional expressions or 1494 ngettext) allow extra arguments if at least one leaf didn't have extra 1495 arguments, but was otherwise OK (either non-literal or checked OK). 1496 If the format is an empty string, this should be counted similarly to the 1497 case of extra format arguments. */ 1498 if (res.number_extra_args > 0 && res.number_non_literal == 0 1499 && res.number_other == 0) 1500 { 1501 if (res.extra_arg_loc == UNKNOWN_LOCATION) 1502 res.extra_arg_loc = loc; 1503 warning_at (res.extra_arg_loc, OPT_Wformat_extra_args, 1504 "too many arguments for format"); 1505 } 1506 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0 1507 && res.number_other == 0) 1508 warning_at (loc, OPT_Wformat_extra_args, "unused arguments in $-style format"); 1509 if (res.number_empty > 0 && res.number_non_literal == 0 1510 && res.number_other == 0) 1511 warning_at (loc, OPT_Wformat_zero_length, "zero-length %s format string", 1512 format_types[info->format_type].name); 1513 1514 if (res.number_wide > 0) 1515 warning_at (loc, OPT_Wformat_, "format is a wide character string"); 1516 1517 if (res.number_unterminated > 0) 1518 warning_at (loc, OPT_Wformat_, "unterminated format string"); 1519 } 1520 1521 /* Callback from check_function_arguments_recurse to check a 1522 format string. FORMAT_TREE is the format parameter. ARG_NUM 1523 is the number of the format argument. CTX points to a 1524 format_check_context. */ 1525 1526 static void 1527 check_format_arg (void *ctx, tree format_tree, 1528 unsigned HOST_WIDE_INT arg_num) 1529 { 1530 format_check_context *format_ctx = (format_check_context *) ctx; 1531 format_check_results *res = format_ctx->res; 1532 function_format_info *info = format_ctx->info; 1533 tree params = format_ctx->params; 1534 vec<location_t> *arglocs = format_ctx->arglocs; 1535 1536 int format_length; 1537 HOST_WIDE_INT offset; 1538 const char *format_chars; 1539 tree array_size = 0; 1540 tree array_init; 1541 1542 location_t fmt_param_loc = EXPR_LOC_OR_LOC (format_tree, input_location); 1543 1544 /* Pull out a constant value if the front end didn't, and handle location 1545 wrappers. */ 1546 format_tree = fold_for_warn (format_tree); 1547 STRIP_NOPS (format_tree); 1548 1549 if (integer_zerop (format_tree)) 1550 { 1551 /* Skip to first argument to check, so we can see if this format 1552 has any arguments (it shouldn't). */ 1553 while (arg_num + 1 < info->first_arg_num) 1554 { 1555 if (params == 0) 1556 return; 1557 params = TREE_CHAIN (params); 1558 ++arg_num; 1559 } 1560 1561 if (params == 0) 1562 res->number_other++; 1563 else 1564 { 1565 if (res->number_extra_args == 0) 1566 res->extra_arg_loc = EXPR_LOC_OR_LOC (TREE_VALUE (params), 1567 input_location); 1568 res->number_extra_args++; 1569 } 1570 return; 1571 } 1572 1573 offset = 0; 1574 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR) 1575 { 1576 tree arg0, arg1; 1577 1578 arg0 = TREE_OPERAND (format_tree, 0); 1579 arg1 = TREE_OPERAND (format_tree, 1); 1580 STRIP_NOPS (arg0); 1581 STRIP_NOPS (arg1); 1582 if (TREE_CODE (arg1) == INTEGER_CST) 1583 format_tree = arg0; 1584 else 1585 { 1586 res->number_non_literal++; 1587 return; 1588 } 1589 /* POINTER_PLUS_EXPR offsets are to be interpreted signed. */ 1590 if (!cst_and_fits_in_hwi (arg1)) 1591 { 1592 res->number_non_literal++; 1593 return; 1594 } 1595 offset = int_cst_value (arg1); 1596 } 1597 if (TREE_CODE (format_tree) != ADDR_EXPR) 1598 { 1599 res->number_non_literal++; 1600 return; 1601 } 1602 res->format_string_loc = EXPR_LOC_OR_LOC (format_tree, input_location); 1603 format_tree = TREE_OPERAND (format_tree, 0); 1604 if (format_types[info->format_type].flags 1605 & (int) FMT_FLAG_PARSE_ARG_CONVERT_EXTERNAL) 1606 { 1607 bool objc_str = (info->format_type == gcc_objc_string_format_type); 1608 /* We cannot examine this string here - but we can check that it is 1609 a valid type. */ 1610 if (TREE_CODE (format_tree) != CONST_DECL 1611 || !((objc_str && objc_string_ref_type_p (TREE_TYPE (format_tree))) 1612 || (*targetcm.string_object_ref_type_p) 1613 ((const_tree) TREE_TYPE (format_tree)))) 1614 { 1615 res->number_non_literal++; 1616 return; 1617 } 1618 /* Skip to first argument to check. */ 1619 while (arg_num + 1 < info->first_arg_num) 1620 { 1621 if (params == 0) 1622 return; 1623 params = TREE_CHAIN (params); 1624 ++arg_num; 1625 } 1626 /* So, we have a valid literal string object and one or more params. 1627 We need to use an external helper to parse the string into format 1628 info. For Objective-C variants we provide the resource within the 1629 objc tree, for target variants, via a hook. */ 1630 if (objc_str) 1631 objc_check_format_arg (format_tree, params); 1632 else if (targetcm.check_string_object_format_arg) 1633 (*targetcm.check_string_object_format_arg) (format_tree, params); 1634 /* Else we can't handle it and retire quietly. */ 1635 return; 1636 } 1637 if (TREE_CODE (format_tree) == ARRAY_REF 1638 && tree_fits_shwi_p (TREE_OPERAND (format_tree, 1)) 1639 && (offset += tree_to_shwi (TREE_OPERAND (format_tree, 1))) >= 0) 1640 format_tree = TREE_OPERAND (format_tree, 0); 1641 if (offset < 0) 1642 { 1643 res->number_non_literal++; 1644 return; 1645 } 1646 if (VAR_P (format_tree) 1647 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE 1648 && (array_init = decl_constant_value (format_tree)) != format_tree 1649 && TREE_CODE (array_init) == STRING_CST) 1650 { 1651 /* Extract the string constant initializer. Note that this may include 1652 a trailing NUL character that is not in the array (e.g. 1653 const char a[3] = "foo";). */ 1654 array_size = DECL_SIZE_UNIT (format_tree); 1655 format_tree = array_init; 1656 } 1657 if (TREE_CODE (format_tree) != STRING_CST) 1658 { 1659 res->number_non_literal++; 1660 return; 1661 } 1662 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node) 1663 { 1664 res->number_wide++; 1665 return; 1666 } 1667 format_chars = TREE_STRING_POINTER (format_tree); 1668 format_length = TREE_STRING_LENGTH (format_tree); 1669 if (array_size != 0) 1670 { 1671 /* Variable length arrays can't be initialized. */ 1672 gcc_assert (TREE_CODE (array_size) == INTEGER_CST); 1673 1674 if (tree_fits_shwi_p (array_size)) 1675 { 1676 HOST_WIDE_INT array_size_value = tree_to_shwi (array_size); 1677 if (array_size_value > 0 1678 && array_size_value == (int) array_size_value 1679 && format_length > array_size_value) 1680 format_length = array_size_value; 1681 } 1682 } 1683 if (offset) 1684 { 1685 if (offset >= format_length) 1686 { 1687 res->number_non_literal++; 1688 return; 1689 } 1690 format_chars += offset; 1691 format_length -= offset; 1692 } 1693 if (format_length < 1 || format_chars[--format_length] != 0) 1694 { 1695 res->number_unterminated++; 1696 return; 1697 } 1698 if (format_length == 0) 1699 { 1700 res->number_empty++; 1701 return; 1702 } 1703 1704 /* Skip to first argument to check. */ 1705 while (arg_num + 1 < info->first_arg_num) 1706 { 1707 if (params == 0) 1708 return; 1709 params = TREE_CHAIN (params); 1710 ++arg_num; 1711 } 1712 /* Provisionally increment res->number_other; check_format_info_main 1713 will decrement it if it finds there are extra arguments, but this way 1714 need not adjust it for every return. */ 1715 res->number_other++; 1716 object_allocator <format_wanted_type> fwt_pool ("format_wanted_type pool"); 1717 check_format_info_main (res, info, format_chars, fmt_param_loc, format_tree, 1718 format_length, params, arg_num, fwt_pool, arglocs); 1719 } 1720 1721 /* Support class for argument_parser and check_format_info_main. 1722 Tracks any flag characters that have been applied to the 1723 current argument. */ 1724 1725 class flag_chars_t 1726 { 1727 public: 1728 flag_chars_t (); 1729 bool has_char_p (char ch) const; 1730 void add_char (char ch); 1731 void validate (const format_kind_info *fki, 1732 const format_char_info *fci, 1733 const format_flag_spec *flag_specs, 1734 const char * const format_chars, 1735 tree format_string_cst, 1736 location_t format_string_loc, 1737 const char * const orig_format_chars, 1738 char format_char, 1739 bool quoted); 1740 int get_alloc_flag (const format_kind_info *fki); 1741 int assignment_suppression_p (const format_kind_info *fki); 1742 1743 private: 1744 char m_flag_chars[256]; 1745 }; 1746 1747 /* Support struct for argument_parser and check_format_info_main. 1748 Encapsulates any length modifier applied to the current argument. */ 1749 1750 struct length_modifier 1751 { 1752 length_modifier () 1753 : chars (NULL), val (FMT_LEN_none), std (STD_C89), 1754 scalar_identity_flag (0) 1755 { 1756 } 1757 1758 length_modifier (const char *chars_, 1759 enum format_lengths val_, 1760 enum format_std_version std_, 1761 int scalar_identity_flag_) 1762 : chars (chars_), val (val_), std (std_), 1763 scalar_identity_flag (scalar_identity_flag_) 1764 { 1765 } 1766 1767 const char *chars; 1768 enum format_lengths val; 1769 enum format_std_version std; 1770 int scalar_identity_flag; 1771 }; 1772 1773 /* Parsing one argument within a format string. */ 1774 1775 class argument_parser 1776 { 1777 public: 1778 argument_parser (function_format_info *info, const char *&format_chars, 1779 tree format_string_cst, 1780 const char * const orig_format_chars, 1781 location_t format_string_loc, flag_chars_t &flag_chars, 1782 int &has_operand_number, tree first_fillin_param, 1783 object_allocator <format_wanted_type> &fwt_pool_, 1784 vec<location_t> *arglocs); 1785 1786 bool read_any_dollar (); 1787 1788 bool read_format_flags (); 1789 1790 bool 1791 read_any_format_width (tree ¶ms, 1792 unsigned HOST_WIDE_INT &arg_num); 1793 1794 void 1795 read_any_format_left_precision (); 1796 1797 bool 1798 read_any_format_precision (tree ¶ms, 1799 unsigned HOST_WIDE_INT &arg_num); 1800 1801 void handle_alloc_chars (); 1802 1803 length_modifier read_any_length_modifier (); 1804 1805 void read_any_other_modifier (); 1806 1807 const format_char_info *find_format_char_info (char format_char); 1808 1809 void 1810 validate_flag_pairs (const format_char_info *fci, 1811 char format_char); 1812 1813 void 1814 give_y2k_warnings (const format_char_info *fci, 1815 char format_char); 1816 1817 void parse_any_scan_set (const format_char_info *fci); 1818 1819 bool handle_conversions (const format_char_info *fci, 1820 const length_modifier &len_modifier, 1821 tree &wanted_type, 1822 const char *&wanted_type_name, 1823 unsigned HOST_WIDE_INT &arg_num, 1824 tree ¶ms, 1825 char format_char); 1826 1827 bool 1828 check_argument_type (const format_char_info *fci, 1829 const length_modifier &len_modifier, 1830 tree &wanted_type, 1831 const char *&wanted_type_name, 1832 const bool suppressed, 1833 unsigned HOST_WIDE_INT &arg_num, 1834 tree ¶ms, 1835 const int alloc_flag, 1836 const char * const format_start, 1837 const char * const type_start, 1838 location_t fmt_param_loc, 1839 char conversion_char); 1840 1841 private: 1842 const function_format_info *const info; 1843 const format_kind_info * const fki; 1844 const format_flag_spec * const flag_specs; 1845 const char *start_of_this_format; 1846 const char *&format_chars; 1847 const tree format_string_cst; 1848 const char * const orig_format_chars; 1849 const location_t format_string_loc; 1850 object_allocator <format_wanted_type> &fwt_pool; 1851 flag_chars_t &flag_chars; 1852 int main_arg_num; 1853 tree main_arg_params; 1854 int &has_operand_number; 1855 const tree first_fillin_param; 1856 format_wanted_type width_wanted_type; 1857 format_wanted_type precision_wanted_type; 1858 public: 1859 format_wanted_type main_wanted_type; 1860 private: 1861 format_wanted_type *first_wanted_type; 1862 format_wanted_type *last_wanted_type; 1863 vec<location_t> *arglocs; 1864 }; 1865 1866 /* flag_chars_t's constructor. */ 1867 1868 flag_chars_t::flag_chars_t () 1869 { 1870 m_flag_chars[0] = 0; 1871 } 1872 1873 /* Has CH been seen as a flag within the current argument? */ 1874 1875 bool 1876 flag_chars_t::has_char_p (char ch) const 1877 { 1878 return strchr (m_flag_chars, ch) != 0; 1879 } 1880 1881 /* Add CH to the flags seen within the current argument. */ 1882 1883 void 1884 flag_chars_t::add_char (char ch) 1885 { 1886 int i = strlen (m_flag_chars); 1887 m_flag_chars[i++] = ch; 1888 m_flag_chars[i] = 0; 1889 } 1890 1891 /* Validate the individual flags used, removing any that are invalid. */ 1892 1893 void 1894 flag_chars_t::validate (const format_kind_info *fki, 1895 const format_char_info *fci, 1896 const format_flag_spec *flag_specs, 1897 const char * const format_chars, 1898 tree format_string_cst, 1899 location_t format_string_loc, 1900 const char * const orig_format_chars, 1901 char format_char, 1902 bool quoted) 1903 { 1904 int i; 1905 int d = 0; 1906 bool quotflag = false; 1907 1908 for (i = 0; m_flag_chars[i] != 0; i++) 1909 { 1910 const format_flag_spec *s = get_flag_spec (flag_specs, 1911 m_flag_chars[i], NULL); 1912 m_flag_chars[i - d] = m_flag_chars[i]; 1913 if (m_flag_chars[i] == fki->length_code_char) 1914 continue; 1915 1916 /* Remember if a quoting flag is seen. */ 1917 quotflag |= s->quoting; 1918 1919 if (strchr (fci->flag_chars, m_flag_chars[i]) == 0) 1920 { 1921 format_warning_at_char (format_string_loc, format_string_cst, 1922 format_chars - orig_format_chars, 1923 OPT_Wformat_, 1924 "%s used with %<%%%c%> %s format", 1925 _(s->name), format_char, fki->name); 1926 d++; 1927 continue; 1928 } 1929 if (pedantic) 1930 { 1931 const format_flag_spec *t; 1932 if (ADJ_STD (s->std) > C_STD_VER) 1933 warning_at (format_string_loc, OPT_Wformat_, 1934 "%s does not support %s", 1935 C_STD_NAME (s->std), _(s->long_name)); 1936 t = get_flag_spec (flag_specs, m_flag_chars[i], fci->flags2); 1937 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std)) 1938 { 1939 const char *long_name = (t->long_name != NULL 1940 ? t->long_name 1941 : s->long_name); 1942 if (ADJ_STD (t->std) > C_STD_VER) 1943 warning_at (format_string_loc, OPT_Wformat_, 1944 "%s does not support %s with" 1945 " the %<%%%c%> %s format", 1946 C_STD_NAME (t->std), _(long_name), 1947 format_char, fki->name); 1948 } 1949 } 1950 1951 /* Detect quoting directives used within a quoted sequence, such 1952 as GCC's "%<...%qE". */ 1953 if (quoted && s->quoting) 1954 { 1955 format_warning_at_char (format_string_loc, format_string_cst, 1956 format_chars - orig_format_chars - 1, 1957 OPT_Wformat_, 1958 "%s used within a quoted sequence", 1959 _(s->name)); 1960 } 1961 } 1962 m_flag_chars[i - d] = 0; 1963 1964 if (!quoted 1965 && !quotflag 1966 && strchr (fci->flags2, '\'')) 1967 { 1968 format_warning_at_char (format_string_loc, format_string_cst, 1969 format_chars - orig_format_chars, 1970 OPT_Wformat_, 1971 "%qc conversion used unquoted", 1972 format_char); 1973 } 1974 } 1975 1976 /* Determine if an assignment-allocation has been set, requiring 1977 an extra char ** for writing back a dynamically-allocated char *. 1978 This is for handling the optional 'm' character in scanf. */ 1979 1980 int 1981 flag_chars_t::get_alloc_flag (const format_kind_info *fki) 1982 { 1983 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 1984 && has_char_p ('a')) 1985 return 1; 1986 if (fki->alloc_char && has_char_p (fki->alloc_char)) 1987 return 1; 1988 return 0; 1989 } 1990 1991 /* Determine if an assignment-suppression character was seen. 1992 ('*' in scanf, for discarding the converted input). */ 1993 1994 int 1995 flag_chars_t::assignment_suppression_p (const format_kind_info *fki) 1996 { 1997 if (fki->suppression_char 1998 && has_char_p (fki->suppression_char)) 1999 return 1; 2000 return 0; 2001 } 2002 2003 /* Constructor for argument_parser. Initialize for parsing one 2004 argument within a format string. */ 2005 2006 argument_parser:: 2007 argument_parser (function_format_info *info_, const char *&format_chars_, 2008 tree format_string_cst_, 2009 const char * const orig_format_chars_, 2010 location_t format_string_loc_, 2011 flag_chars_t &flag_chars_, 2012 int &has_operand_number_, 2013 tree first_fillin_param_, 2014 object_allocator <format_wanted_type> &fwt_pool_, 2015 vec<location_t> *arglocs_) 2016 : info (info_), 2017 fki (&format_types[info->format_type]), 2018 flag_specs (fki->flag_specs), 2019 start_of_this_format (format_chars_), 2020 format_chars (format_chars_), 2021 format_string_cst (format_string_cst_), 2022 orig_format_chars (orig_format_chars_), 2023 format_string_loc (format_string_loc_), 2024 fwt_pool (fwt_pool_), 2025 flag_chars (flag_chars_), 2026 main_arg_num (0), 2027 main_arg_params (NULL), 2028 has_operand_number (has_operand_number_), 2029 first_fillin_param (first_fillin_param_), 2030 first_wanted_type (NULL), 2031 last_wanted_type (NULL), 2032 arglocs (arglocs_) 2033 { 2034 } 2035 2036 /* Handle dollars at the start of format arguments, setting up main_arg_params 2037 and main_arg_num. 2038 2039 Return true if format parsing is to continue, false otherwise. */ 2040 2041 bool 2042 argument_parser::read_any_dollar () 2043 { 2044 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0) 2045 { 2046 /* Possibly read a $ operand number at the start of the format. 2047 If one was previously used, one is required here. If one 2048 is not used here, we can't immediately conclude this is a 2049 format without them, since it could be printf %m or scanf %*. */ 2050 int opnum; 2051 opnum = maybe_read_dollar_number (&format_chars, 0, 2052 first_fillin_param, 2053 &main_arg_params, fki); 2054 if (opnum == -1) 2055 return false; 2056 else if (opnum > 0) 2057 { 2058 has_operand_number = 1; 2059 main_arg_num = opnum + info->first_arg_num - 1; 2060 } 2061 } 2062 else if (fki->flags & FMT_FLAG_USE_DOLLAR) 2063 { 2064 if (avoid_dollar_number (format_chars)) 2065 return false; 2066 } 2067 return true; 2068 } 2069 2070 /* Read any format flags, but do not yet validate them beyond removing 2071 duplicates, since in general validation depends on the rest of 2072 the format. 2073 2074 Return true if format parsing is to continue, false otherwise. */ 2075 2076 bool 2077 argument_parser::read_format_flags () 2078 { 2079 while (*format_chars != 0 2080 && strchr (fki->flag_chars, *format_chars) != 0) 2081 { 2082 const format_flag_spec *s = get_flag_spec (flag_specs, 2083 *format_chars, NULL); 2084 if (flag_chars.has_char_p (*format_chars)) 2085 { 2086 format_warning_at_char (format_string_loc, format_string_cst, 2087 format_chars + 1 - orig_format_chars, 2088 OPT_Wformat_, 2089 "repeated %s in format", _(s->name)); 2090 } 2091 else 2092 flag_chars.add_char (*format_chars); 2093 2094 if (s->skip_next_char) 2095 { 2096 ++format_chars; 2097 if (*format_chars == 0) 2098 { 2099 warning_at (format_string_loc, OPT_Wformat_, 2100 "missing fill character at end of strfmon format"); 2101 return false; 2102 } 2103 } 2104 ++format_chars; 2105 } 2106 2107 return true; 2108 } 2109 2110 /* Read any format width, possibly * or *m$. 2111 2112 Return true if format parsing is to continue, false otherwise. */ 2113 2114 bool 2115 argument_parser:: 2116 read_any_format_width (tree ¶ms, 2117 unsigned HOST_WIDE_INT &arg_num) 2118 { 2119 if (!fki->width_char) 2120 return true; 2121 2122 if (fki->width_type != NULL && *format_chars == '*') 2123 { 2124 flag_chars.add_char (fki->width_char); 2125 /* "...a field width...may be indicated by an asterisk. 2126 In this case, an int argument supplies the field width..." */ 2127 ++format_chars; 2128 if (has_operand_number != 0) 2129 { 2130 int opnum; 2131 opnum = maybe_read_dollar_number (&format_chars, 2132 has_operand_number == 1, 2133 first_fillin_param, 2134 ¶ms, fki); 2135 if (opnum == -1) 2136 return false; 2137 else if (opnum > 0) 2138 { 2139 has_operand_number = 1; 2140 arg_num = opnum + info->first_arg_num - 1; 2141 } 2142 else 2143 has_operand_number = 0; 2144 } 2145 else 2146 { 2147 if (avoid_dollar_number (format_chars)) 2148 return false; 2149 } 2150 if (info->first_arg_num != 0) 2151 { 2152 tree cur_param; 2153 if (params == 0) 2154 cur_param = NULL; 2155 else 2156 { 2157 cur_param = TREE_VALUE (params); 2158 if (has_operand_number <= 0) 2159 { 2160 params = TREE_CHAIN (params); 2161 ++arg_num; 2162 } 2163 } 2164 width_wanted_type.wanted_type = *fki->width_type; 2165 width_wanted_type.wanted_type_name = NULL; 2166 width_wanted_type.pointer_count = 0; 2167 width_wanted_type.char_lenient_flag = 0; 2168 width_wanted_type.scalar_identity_flag = 0; 2169 width_wanted_type.writing_in_flag = 0; 2170 width_wanted_type.reading_from_flag = 0; 2171 width_wanted_type.kind = CF_KIND_FIELD_WIDTH; 2172 width_wanted_type.format_start = format_chars - 1; 2173 width_wanted_type.format_length = 1; 2174 width_wanted_type.param = cur_param; 2175 width_wanted_type.arg_num = arg_num; 2176 width_wanted_type.offset_loc = 2177 format_chars - orig_format_chars; 2178 width_wanted_type.next = NULL; 2179 if (last_wanted_type != 0) 2180 last_wanted_type->next = &width_wanted_type; 2181 if (first_wanted_type == 0) 2182 first_wanted_type = &width_wanted_type; 2183 last_wanted_type = &width_wanted_type; 2184 } 2185 } 2186 else 2187 { 2188 /* Possibly read a numeric width. If the width is zero, 2189 we complain if appropriate. */ 2190 int non_zero_width_char = FALSE; 2191 int found_width = FALSE; 2192 while (ISDIGIT (*format_chars)) 2193 { 2194 found_width = TRUE; 2195 if (*format_chars != '0') 2196 non_zero_width_char = TRUE; 2197 ++format_chars; 2198 } 2199 if (found_width && !non_zero_width_char && 2200 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD)) 2201 warning_at (format_string_loc, OPT_Wformat_, 2202 "zero width in %s format", fki->name); 2203 if (found_width) 2204 flag_chars.add_char (fki->width_char); 2205 } 2206 2207 return true; 2208 } 2209 2210 /* Read any format left precision (must be a number, not *). */ 2211 void 2212 argument_parser::read_any_format_left_precision () 2213 { 2214 if (fki->left_precision_char == 0) 2215 return; 2216 if (*format_chars != '#') 2217 return; 2218 2219 ++format_chars; 2220 flag_chars.add_char (fki->left_precision_char); 2221 if (!ISDIGIT (*format_chars)) 2222 format_warning_at_char (format_string_loc, format_string_cst, 2223 format_chars - orig_format_chars, 2224 OPT_Wformat_, 2225 "empty left precision in %s format", fki->name); 2226 while (ISDIGIT (*format_chars)) 2227 ++format_chars; 2228 } 2229 2230 /* Read any format precision, possibly * or *m$. 2231 2232 Return true if format parsing is to continue, false otherwise. */ 2233 2234 bool 2235 argument_parser:: 2236 read_any_format_precision (tree ¶ms, 2237 unsigned HOST_WIDE_INT &arg_num) 2238 { 2239 if (fki->precision_char == 0) 2240 return true; 2241 if (*format_chars != '.') 2242 return true; 2243 2244 ++format_chars; 2245 flag_chars.add_char (fki->precision_char); 2246 if (fki->precision_type != NULL && *format_chars == '*') 2247 { 2248 /* "...a...precision...may be indicated by an asterisk. 2249 In this case, an int argument supplies the...precision." */ 2250 ++format_chars; 2251 if (has_operand_number != 0) 2252 { 2253 int opnum; 2254 opnum = maybe_read_dollar_number (&format_chars, 2255 has_operand_number == 1, 2256 first_fillin_param, 2257 ¶ms, fki); 2258 if (opnum == -1) 2259 return false; 2260 else if (opnum > 0) 2261 { 2262 has_operand_number = 1; 2263 arg_num = opnum + info->first_arg_num - 1; 2264 } 2265 else 2266 has_operand_number = 0; 2267 } 2268 else 2269 { 2270 if (avoid_dollar_number (format_chars)) 2271 return false; 2272 } 2273 if (info->first_arg_num != 0) 2274 { 2275 tree cur_param; 2276 if (params == 0) 2277 cur_param = NULL; 2278 else 2279 { 2280 cur_param = TREE_VALUE (params); 2281 if (has_operand_number <= 0) 2282 { 2283 params = TREE_CHAIN (params); 2284 ++arg_num; 2285 } 2286 } 2287 precision_wanted_type.wanted_type = *fki->precision_type; 2288 precision_wanted_type.wanted_type_name = NULL; 2289 precision_wanted_type.pointer_count = 0; 2290 precision_wanted_type.char_lenient_flag = 0; 2291 precision_wanted_type.scalar_identity_flag = 0; 2292 precision_wanted_type.writing_in_flag = 0; 2293 precision_wanted_type.reading_from_flag = 0; 2294 precision_wanted_type.kind = CF_KIND_FIELD_PRECISION; 2295 precision_wanted_type.param = cur_param; 2296 precision_wanted_type.format_start = format_chars - 2; 2297 precision_wanted_type.format_length = 2; 2298 precision_wanted_type.arg_num = arg_num; 2299 precision_wanted_type.offset_loc = 2300 format_chars - orig_format_chars; 2301 precision_wanted_type.next = NULL; 2302 if (last_wanted_type != 0) 2303 last_wanted_type->next = &precision_wanted_type; 2304 if (first_wanted_type == 0) 2305 first_wanted_type = &precision_wanted_type; 2306 last_wanted_type = &precision_wanted_type; 2307 } 2308 } 2309 else 2310 { 2311 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK) 2312 && !ISDIGIT (*format_chars)) 2313 format_warning_at_char (format_string_loc, format_string_cst, 2314 format_chars - orig_format_chars, 2315 OPT_Wformat_, 2316 "empty precision in %s format", fki->name); 2317 while (ISDIGIT (*format_chars)) 2318 ++format_chars; 2319 } 2320 2321 return true; 2322 } 2323 2324 /* Parse any assignment-allocation flags, which request an extra 2325 char ** for writing back a dynamically-allocated char *. 2326 This is for handling the optional 'm' character in scanf, 2327 and, before C99, 'a' (for compatibility with a non-standard 2328 GNU libc extension). */ 2329 2330 void 2331 argument_parser::handle_alloc_chars () 2332 { 2333 if (fki->alloc_char && fki->alloc_char == *format_chars) 2334 { 2335 flag_chars.add_char (fki->alloc_char); 2336 format_chars++; 2337 } 2338 2339 /* Handle the scanf allocation kludge. */ 2340 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 2341 { 2342 if (*format_chars == 'a' && !flag_isoc99) 2343 { 2344 if (format_chars[1] == 's' || format_chars[1] == 'S' 2345 || format_chars[1] == '[') 2346 { 2347 /* 'a' is used as a flag. */ 2348 flag_chars.add_char ('a'); 2349 format_chars++; 2350 } 2351 } 2352 } 2353 } 2354 2355 /* Look for length modifiers within the current format argument, 2356 returning a length_modifier instance describing it (or the 2357 default if one is not found). 2358 2359 Issue warnings about non-standard modifiers. */ 2360 2361 length_modifier 2362 argument_parser::read_any_length_modifier () 2363 { 2364 length_modifier result; 2365 2366 const format_length_info *fli = fki->length_char_specs; 2367 if (!fli) 2368 return result; 2369 2370 while (fli->name != 0 2371 && strncmp (fli->name, format_chars, strlen (fli->name))) 2372 fli++; 2373 if (fli->name != 0) 2374 { 2375 format_chars += strlen (fli->name); 2376 if (fli->double_name != 0 && fli->name[0] == *format_chars) 2377 { 2378 format_chars++; 2379 result = length_modifier (fli->double_name, fli->double_index, 2380 fli->double_std, 0); 2381 } 2382 else 2383 { 2384 result = length_modifier (fli->name, fli->index, fli->std, 2385 fli->scalar_identity_flag); 2386 } 2387 flag_chars.add_char (fki->length_code_char); 2388 } 2389 if (pedantic) 2390 { 2391 /* Warn if the length modifier is non-standard. */ 2392 if (ADJ_STD (result.std) > C_STD_VER) 2393 warning_at (format_string_loc, OPT_Wformat_, 2394 "%s does not support the %qs %s length modifier", 2395 C_STD_NAME (result.std), result.chars, 2396 fki->name); 2397 } 2398 2399 return result; 2400 } 2401 2402 /* Read any other modifier (strftime E/O). */ 2403 2404 void 2405 argument_parser::read_any_other_modifier () 2406 { 2407 if (fki->modifier_chars == NULL) 2408 return; 2409 2410 while (*format_chars != 0 2411 && strchr (fki->modifier_chars, *format_chars) != 0) 2412 { 2413 if (flag_chars.has_char_p (*format_chars)) 2414 { 2415 const format_flag_spec *s = get_flag_spec (flag_specs, 2416 *format_chars, NULL); 2417 format_warning_at_char (format_string_loc, format_string_cst, 2418 format_chars - orig_format_chars, 2419 OPT_Wformat_, 2420 "repeated %s in format", _(s->name)); 2421 } 2422 else 2423 flag_chars.add_char (*format_chars); 2424 ++format_chars; 2425 } 2426 } 2427 2428 /* Return the format_char_info corresponding to FORMAT_CHAR, 2429 potentially issuing a warning if the format char is 2430 not supported in the C standard version we are checking 2431 against. 2432 2433 Issue a warning and return NULL if it is not found. 2434 2435 Issue warnings about non-standard modifiers. */ 2436 2437 const format_char_info * 2438 argument_parser::find_format_char_info (char format_char) 2439 { 2440 const format_char_info *fci = fki->conversion_specs; 2441 2442 while (fci->format_chars != 0 2443 && strchr (fci->format_chars, format_char) == 0) 2444 ++fci; 2445 if (fci->format_chars == 0) 2446 { 2447 format_warning_at_char (format_string_loc, format_string_cst, 2448 format_chars - orig_format_chars, 2449 OPT_Wformat_, 2450 "unknown conversion type character" 2451 " %qc in format", 2452 format_char); 2453 return NULL; 2454 } 2455 2456 if (pedantic) 2457 { 2458 if (ADJ_STD (fci->std) > C_STD_VER) 2459 format_warning_at_char (format_string_loc, format_string_cst, 2460 format_chars - orig_format_chars, 2461 OPT_Wformat_, 2462 "%s does not support the %<%%%c%> %s format", 2463 C_STD_NAME (fci->std), format_char, fki->name); 2464 } 2465 2466 return fci; 2467 } 2468 2469 /* Validate the pairs of flags used. 2470 Issue warnings about incompatible combinations of flags. */ 2471 2472 void 2473 argument_parser::validate_flag_pairs (const format_char_info *fci, 2474 char format_char) 2475 { 2476 const format_flag_pair * const bad_flag_pairs = fki->bad_flag_pairs; 2477 2478 for (int i = 0; bad_flag_pairs[i].flag_char1 != 0; i++) 2479 { 2480 const format_flag_spec *s, *t; 2481 if (!flag_chars.has_char_p (bad_flag_pairs[i].flag_char1)) 2482 continue; 2483 if (!flag_chars.has_char_p (bad_flag_pairs[i].flag_char2)) 2484 continue; 2485 if (bad_flag_pairs[i].predicate != 0 2486 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0) 2487 continue; 2488 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL); 2489 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL); 2490 if (bad_flag_pairs[i].ignored) 2491 { 2492 if (bad_flag_pairs[i].predicate != 0) 2493 warning_at (format_string_loc, OPT_Wformat_, 2494 "%s ignored with %s and %<%%%c%> %s format", 2495 _(s->name), _(t->name), format_char, 2496 fki->name); 2497 else 2498 warning_at (format_string_loc, OPT_Wformat_, 2499 "%s ignored with %s in %s format", 2500 _(s->name), _(t->name), fki->name); 2501 } 2502 else 2503 { 2504 if (bad_flag_pairs[i].predicate != 0) 2505 warning_at (format_string_loc, OPT_Wformat_, 2506 "use of %s and %s together with %<%%%c%> %s format", 2507 _(s->name), _(t->name), format_char, 2508 fki->name); 2509 else 2510 warning_at (format_string_loc, OPT_Wformat_, 2511 "use of %s and %s together in %s format", 2512 _(s->name), _(t->name), fki->name); 2513 } 2514 } 2515 } 2516 2517 /* Give Y2K warnings. */ 2518 2519 void 2520 argument_parser::give_y2k_warnings (const format_char_info *fci, 2521 char format_char) 2522 { 2523 if (!warn_format_y2k) 2524 return; 2525 2526 int y2k_level = 0; 2527 if (strchr (fci->flags2, '4') != 0) 2528 if (flag_chars.has_char_p ('E')) 2529 y2k_level = 3; 2530 else 2531 y2k_level = 2; 2532 else if (strchr (fci->flags2, '3') != 0) 2533 y2k_level = 3; 2534 else if (strchr (fci->flags2, '2') != 0) 2535 y2k_level = 2; 2536 if (y2k_level == 3) 2537 warning_at (format_string_loc, OPT_Wformat_y2k, 2538 "%<%%%c%> yields only last 2 digits of " 2539 "year in some locales", format_char); 2540 else if (y2k_level == 2) 2541 warning_at (format_string_loc, OPT_Wformat_y2k, 2542 "%<%%%c%> yields only last 2 digits of year", 2543 format_char); 2544 } 2545 2546 /* Parse any "scan sets" enclosed in square brackets, e.g. 2547 for scanf-style calls. */ 2548 2549 void 2550 argument_parser::parse_any_scan_set (const format_char_info *fci) 2551 { 2552 if (strchr (fci->flags2, '[') == NULL) 2553 return; 2554 2555 /* Skip over scan set, in case it happens to have '%' in it. */ 2556 if (*format_chars == '^') 2557 ++format_chars; 2558 /* Find closing bracket; if one is hit immediately, then 2559 it's part of the scan set rather than a terminator. */ 2560 if (*format_chars == ']') 2561 ++format_chars; 2562 while (*format_chars && *format_chars != ']') 2563 ++format_chars; 2564 if (*format_chars != ']') 2565 /* The end of the format string was reached. */ 2566 format_warning_at_char (format_string_loc, format_string_cst, 2567 format_chars - orig_format_chars, 2568 OPT_Wformat_, 2569 "no closing %<]%> for %<%%[%> format"); 2570 } 2571 2572 /* Return true if this argument is to be continued to be parsed, 2573 false to skip to next argument. */ 2574 2575 bool 2576 argument_parser::handle_conversions (const format_char_info *fci, 2577 const length_modifier &len_modifier, 2578 tree &wanted_type, 2579 const char *&wanted_type_name, 2580 unsigned HOST_WIDE_INT &arg_num, 2581 tree ¶ms, 2582 char format_char) 2583 { 2584 enum format_std_version wanted_type_std; 2585 2586 if (!(fki->flags & (int) FMT_FLAG_ARG_CONVERT)) 2587 return true; 2588 2589 wanted_type = (fci->types[len_modifier.val].type 2590 ? *fci->types[len_modifier.val].type : 0); 2591 wanted_type_name = fci->types[len_modifier.val].name; 2592 wanted_type_std = fci->types[len_modifier.val].std; 2593 if (wanted_type == 0) 2594 { 2595 format_warning_at_char (format_string_loc, format_string_cst, 2596 format_chars - orig_format_chars, 2597 OPT_Wformat_, 2598 "use of %qs length modifier with %qc type" 2599 " character has either no effect" 2600 " or undefined behavior", 2601 len_modifier.chars, format_char); 2602 /* Heuristic: skip one argument when an invalid length/type 2603 combination is encountered. */ 2604 arg_num++; 2605 if (params != 0) 2606 params = TREE_CHAIN (params); 2607 return false; 2608 } 2609 else if (pedantic 2610 /* Warn if non-standard, provided it is more non-standard 2611 than the length and type characters that may already 2612 have been warned for. */ 2613 && ADJ_STD (wanted_type_std) > ADJ_STD (len_modifier.std) 2614 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std)) 2615 { 2616 if (ADJ_STD (wanted_type_std) > C_STD_VER) 2617 format_warning_at_char (format_string_loc, format_string_cst, 2618 format_chars - orig_format_chars, 2619 OPT_Wformat_, 2620 "%s does not support the %<%%%s%c%> %s format", 2621 C_STD_NAME (wanted_type_std), 2622 len_modifier.chars, 2623 format_char, fki->name); 2624 } 2625 2626 return true; 2627 } 2628 2629 /* Check type of argument against desired type. 2630 2631 Return true if format parsing is to continue, false otherwise. */ 2632 2633 bool 2634 argument_parser:: 2635 check_argument_type (const format_char_info *fci, 2636 const length_modifier &len_modifier, 2637 tree &wanted_type, 2638 const char *&wanted_type_name, 2639 const bool suppressed, 2640 unsigned HOST_WIDE_INT &arg_num, 2641 tree ¶ms, 2642 const int alloc_flag, 2643 const char * const format_start, 2644 const char * const type_start, 2645 location_t fmt_param_loc, 2646 char conversion_char) 2647 { 2648 if (info->first_arg_num == 0) 2649 return true; 2650 2651 if ((fci->pointer_count == 0 && wanted_type == void_type_node) 2652 || suppressed) 2653 { 2654 if (main_arg_num != 0) 2655 { 2656 if (suppressed) 2657 warning_at (format_string_loc, OPT_Wformat_, 2658 "operand number specified with " 2659 "suppressed assignment"); 2660 else 2661 warning_at (format_string_loc, OPT_Wformat_, 2662 "operand number specified for format " 2663 "taking no argument"); 2664 } 2665 } 2666 else 2667 { 2668 format_wanted_type *wanted_type_ptr; 2669 2670 if (main_arg_num != 0) 2671 { 2672 arg_num = main_arg_num; 2673 params = main_arg_params; 2674 } 2675 else 2676 { 2677 ++arg_num; 2678 if (has_operand_number > 0) 2679 { 2680 warning_at (format_string_loc, OPT_Wformat_, 2681 "missing $ operand number in format"); 2682 return false; 2683 } 2684 else 2685 has_operand_number = 0; 2686 } 2687 2688 wanted_type_ptr = &main_wanted_type; 2689 while (fci) 2690 { 2691 tree cur_param; 2692 if (params == 0) 2693 cur_param = NULL; 2694 else 2695 { 2696 cur_param = TREE_VALUE (params); 2697 params = TREE_CHAIN (params); 2698 } 2699 2700 wanted_type_ptr->wanted_type = wanted_type; 2701 wanted_type_ptr->wanted_type_name = wanted_type_name; 2702 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag; 2703 wanted_type_ptr->char_lenient_flag = 0; 2704 if (strchr (fci->flags2, 'c') != 0) 2705 wanted_type_ptr->char_lenient_flag = 1; 2706 wanted_type_ptr->scalar_identity_flag = 0; 2707 if (len_modifier.scalar_identity_flag) 2708 wanted_type_ptr->scalar_identity_flag = 1; 2709 wanted_type_ptr->writing_in_flag = 0; 2710 wanted_type_ptr->reading_from_flag = 0; 2711 if (alloc_flag) 2712 wanted_type_ptr->writing_in_flag = 1; 2713 else 2714 { 2715 if (strchr (fci->flags2, 'W') != 0) 2716 wanted_type_ptr->writing_in_flag = 1; 2717 if (strchr (fci->flags2, 'R') != 0) 2718 wanted_type_ptr->reading_from_flag = 1; 2719 } 2720 wanted_type_ptr->kind = CF_KIND_FORMAT; 2721 wanted_type_ptr->param = cur_param; 2722 wanted_type_ptr->arg_num = arg_num; 2723 wanted_type_ptr->format_start = format_start; 2724 wanted_type_ptr->format_length = format_chars - format_start; 2725 wanted_type_ptr->offset_loc = format_chars - orig_format_chars; 2726 wanted_type_ptr->next = NULL; 2727 if (last_wanted_type != 0) 2728 last_wanted_type->next = wanted_type_ptr; 2729 if (first_wanted_type == 0) 2730 first_wanted_type = wanted_type_ptr; 2731 last_wanted_type = wanted_type_ptr; 2732 2733 fci = fci->chain; 2734 if (fci) 2735 { 2736 wanted_type_ptr = fwt_pool.allocate (); 2737 arg_num++; 2738 wanted_type = *fci->types[len_modifier.val].type; 2739 wanted_type_name = fci->types[len_modifier.val].name; 2740 } 2741 } 2742 } 2743 2744 if (first_wanted_type != 0) 2745 { 2746 ptrdiff_t offset_to_format_start = (start_of_this_format - 1) - orig_format_chars; 2747 ptrdiff_t offset_to_format_end = (format_chars - 1) - orig_format_chars; 2748 /* By default, use the end of the range for the caret location. */ 2749 substring_loc fmt_loc (fmt_param_loc, TREE_TYPE (format_string_cst), 2750 offset_to_format_end, 2751 offset_to_format_start, offset_to_format_end); 2752 ptrdiff_t offset_to_type_start = type_start - orig_format_chars; 2753 check_format_types (fmt_loc, first_wanted_type, fki, 2754 offset_to_type_start, 2755 conversion_char, arglocs); 2756 } 2757 2758 return true; 2759 } 2760 2761 /* Do the main part of checking a call to a format function. FORMAT_CHARS 2762 is the NUL-terminated format string (which at this point may contain 2763 internal NUL characters); FORMAT_LENGTH is its length (excluding the 2764 terminating NUL character). ARG_NUM is one less than the number of 2765 the first format argument to check; PARAMS points to that format 2766 argument in the list of arguments. */ 2767 2768 static void 2769 check_format_info_main (format_check_results *res, 2770 function_format_info *info, const char *format_chars, 2771 location_t fmt_param_loc, tree format_string_cst, 2772 int format_length, tree params, 2773 unsigned HOST_WIDE_INT arg_num, 2774 object_allocator <format_wanted_type> &fwt_pool, 2775 vec<location_t> *arglocs) 2776 { 2777 const char * const orig_format_chars = format_chars; 2778 const tree first_fillin_param = params; 2779 2780 const format_kind_info * const fki = &format_types[info->format_type]; 2781 const format_flag_spec * const flag_specs = fki->flag_specs; 2782 const location_t format_string_loc = res->format_string_loc; 2783 2784 /* -1 if no conversions taking an operand have been found; 0 if one has 2785 and it didn't use $; 1 if $ formats are in use. */ 2786 int has_operand_number = -1; 2787 2788 /* Vector of pointers to opening quoting directives (like GCC "%<"). */ 2789 auto_vec<const char*> quotdirs; 2790 2791 /* Pointers to the most recent color directives (like GCC's "%r or %R"). 2792 A starting color directive much be terminated before the end of 2793 the format string. A terminating directive makes no sense without 2794 a prior starting directive. */ 2795 const char *color_begin = NULL; 2796 const char *color_end = NULL; 2797 2798 init_dollar_format_checking (info->first_arg_num, first_fillin_param); 2799 2800 while (*format_chars != 0) 2801 { 2802 if (*format_chars++ != '%') 2803 continue; 2804 if (*format_chars == 0) 2805 { 2806 format_warning_at_char (format_string_loc, format_string_cst, 2807 format_chars - orig_format_chars, 2808 OPT_Wformat_, 2809 "spurious trailing %<%%%> in format"); 2810 continue; 2811 } 2812 if (*format_chars == '%') 2813 { 2814 ++format_chars; 2815 continue; 2816 } 2817 2818 flag_chars_t flag_chars; 2819 argument_parser arg_parser (info, format_chars, format_string_cst, 2820 orig_format_chars, format_string_loc, 2821 flag_chars, has_operand_number, 2822 first_fillin_param, fwt_pool, arglocs); 2823 2824 if (!arg_parser.read_any_dollar ()) 2825 return; 2826 2827 if (!arg_parser.read_format_flags ()) 2828 return; 2829 2830 /* Read any format width, possibly * or *m$. */ 2831 if (!arg_parser.read_any_format_width (params, arg_num)) 2832 return; 2833 2834 /* Read any format left precision (must be a number, not *). */ 2835 arg_parser.read_any_format_left_precision (); 2836 2837 /* Read any format precision, possibly * or *m$. */ 2838 if (!arg_parser.read_any_format_precision (params, arg_num)) 2839 return; 2840 2841 const char *format_start = format_chars; 2842 2843 arg_parser.handle_alloc_chars (); 2844 2845 /* The rest of the conversion specification is the length modifier 2846 (if any), and the conversion specifier, so this is where the 2847 type information starts. If we need to issue a suggestion 2848 about a type mismatch, then we should preserve everything up 2849 to here. */ 2850 const char *type_start = format_chars; 2851 2852 /* Read any length modifier, if this kind of format has them. */ 2853 const length_modifier len_modifier 2854 = arg_parser.read_any_length_modifier (); 2855 2856 /* Read any modifier (strftime E/O). */ 2857 arg_parser.read_any_other_modifier (); 2858 2859 char format_char = *format_chars; 2860 if (format_char == 0 2861 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK) 2862 && format_char == '%')) 2863 { 2864 format_warning_at_char (format_string_loc, format_string_cst, 2865 format_chars - orig_format_chars, 2866 OPT_Wformat_, 2867 "conversion lacks type at end of format"); 2868 continue; 2869 } 2870 format_chars++; 2871 2872 const format_char_info * const fci 2873 = arg_parser.find_format_char_info (format_char); 2874 if (!fci) 2875 continue; 2876 2877 flag_chars.validate (fki, fci, flag_specs, format_chars, 2878 format_string_cst, 2879 format_string_loc, orig_format_chars, format_char, 2880 quotdirs.length () > 0); 2881 2882 const int alloc_flag = flag_chars.get_alloc_flag (fki); 2883 const bool suppressed = flag_chars.assignment_suppression_p (fki); 2884 2885 /* Diagnose nested or unmatched quoting directives such as GCC's 2886 "%<...%<" and "%>...%>". */ 2887 bool quot_begin_p = strchr (fci->flags2, '<'); 2888 bool quot_end_p = strchr (fci->flags2, '>'); 2889 2890 if (quot_begin_p && !quot_end_p) 2891 { 2892 if (quotdirs.length ()) 2893 format_warning_at_char (format_string_loc, format_string_cst, 2894 format_chars - orig_format_chars, 2895 OPT_Wformat_, 2896 "nested quoting directive"); 2897 quotdirs.safe_push (format_chars); 2898 } 2899 else if (!quot_begin_p && quot_end_p) 2900 { 2901 if (quotdirs.length ()) 2902 quotdirs.pop (); 2903 else 2904 format_warning_at_char (format_string_loc, format_string_cst, 2905 format_chars - orig_format_chars, 2906 OPT_Wformat_, 2907 "unmatched quoting directive"); 2908 } 2909 2910 bool color_begin_p = strchr (fci->flags2, '/'); 2911 if (color_begin_p) 2912 { 2913 color_begin = format_chars; 2914 color_end = NULL; 2915 } 2916 else if (strchr (fci->flags2, '\\')) 2917 { 2918 if (color_end) 2919 format_warning_at_char (format_string_loc, format_string_cst, 2920 format_chars - orig_format_chars, 2921 OPT_Wformat_, 2922 "%qc directive redundant after prior " 2923 "occurence of the same", format_char); 2924 else if (!color_begin) 2925 format_warning_at_char (format_string_loc, format_string_cst, 2926 format_chars - orig_format_chars, 2927 OPT_Wformat_, 2928 "unmatched color reset directive"); 2929 color_end = format_chars; 2930 } 2931 2932 /* Diagnose directives that shouldn't appear in a quoted sequence. 2933 (They are denoted by a double quote in FLAGS2.) */ 2934 if (quotdirs.length ()) 2935 { 2936 if (strchr (fci->flags2, '"')) 2937 format_warning_at_char (format_string_loc, format_string_cst, 2938 format_chars - orig_format_chars, 2939 OPT_Wformat_, 2940 "%qc conversion used within a quoted " 2941 "sequence", 2942 format_char); 2943 } 2944 2945 /* Validate the pairs of flags used. */ 2946 arg_parser.validate_flag_pairs (fci, format_char); 2947 2948 arg_parser.give_y2k_warnings (fci, format_char); 2949 2950 arg_parser.parse_any_scan_set (fci); 2951 2952 tree wanted_type = NULL; 2953 const char *wanted_type_name = NULL; 2954 2955 if (!arg_parser.handle_conversions (fci, len_modifier, 2956 wanted_type, wanted_type_name, 2957 arg_num, 2958 params, 2959 format_char)) 2960 continue; 2961 2962 arg_parser.main_wanted_type.next = NULL; 2963 2964 /* Finally. . .check type of argument against desired type! */ 2965 if (!arg_parser.check_argument_type (fci, len_modifier, 2966 wanted_type, wanted_type_name, 2967 suppressed, 2968 arg_num, params, 2969 alloc_flag, 2970 format_start, type_start, 2971 fmt_param_loc, 2972 format_char)) 2973 return; 2974 } 2975 2976 if (format_chars - orig_format_chars != format_length) 2977 format_warning_at_char (format_string_loc, format_string_cst, 2978 format_chars + 1 - orig_format_chars, 2979 OPT_Wformat_contains_nul, 2980 "embedded %<\\0%> in format"); 2981 if (info->first_arg_num != 0 && params != 0 2982 && has_operand_number <= 0) 2983 { 2984 res->number_other--; 2985 res->number_extra_args++; 2986 } 2987 if (has_operand_number > 0) 2988 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK); 2989 2990 if (quotdirs.length ()) 2991 format_warning_at_char (format_string_loc, format_string_cst, 2992 quotdirs.pop () - orig_format_chars, 2993 OPT_Wformat_, "unterminated quoting directive"); 2994 if (color_begin && !color_end) 2995 format_warning_at_char (format_string_loc, format_string_cst, 2996 color_begin - orig_format_chars, 2997 OPT_Wformat_, "unterminated color directive"); 2998 } 2999 3000 /* Check the argument types from a single format conversion (possibly 3001 including width and precision arguments). 3002 3003 FMT_LOC is the location of the format conversion. 3004 3005 TYPES is a singly-linked list expressing the parts of the format 3006 conversion that expect argument types, and the arguments they 3007 correspond to. 3008 3009 OFFSET_TO_TYPE_START is the offset within the execution-charset encoded 3010 format string to where type information begins for the conversion 3011 (the length modifier and conversion specifier). 3012 3013 CONVERSION_CHAR is the user-provided conversion specifier. 3014 3015 For example, given: 3016 3017 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5); 3018 3019 then FMT_LOC covers this range: 3020 3021 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5); 3022 ^^^^^^^^^ 3023 3024 and TYPES in this case is a three-entry singly-linked list consisting of: 3025 (1) the check for the field width here: 3026 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5); 3027 ^ ^^^^ 3028 against arg3, and 3029 (2) the check for the field precision here: 3030 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5); 3031 ^^ ^^^^ 3032 against arg4, and 3033 (3) the check for the length modifier and conversion char here: 3034 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5); 3035 ^^^ ^^^^ 3036 against arg5. 3037 3038 OFFSET_TO_TYPE_START is 13, the offset to the "lld" within the 3039 STRING_CST: 3040 3041 0000000000111111111122 3042 0123456789012345678901 3043 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5); 3044 ^ ^ 3045 | ` CONVERSION_CHAR: 'd' 3046 type starts here. */ 3047 3048 static void 3049 check_format_types (const substring_loc &fmt_loc, 3050 format_wanted_type *types, const format_kind_info *fki, 3051 int offset_to_type_start, 3052 char conversion_char, 3053 vec<location_t> *arglocs) 3054 { 3055 for (; types != 0; types = types->next) 3056 { 3057 tree cur_param; 3058 tree cur_type; 3059 tree orig_cur_type; 3060 tree wanted_type; 3061 int arg_num; 3062 int i; 3063 int char_type_flag; 3064 3065 wanted_type = types->wanted_type; 3066 arg_num = types->arg_num; 3067 3068 /* The following should not occur here. */ 3069 gcc_assert (wanted_type); 3070 gcc_assert (wanted_type != void_type_node || types->pointer_count); 3071 3072 if (types->pointer_count == 0) 3073 wanted_type = lang_hooks.types.type_promotes_to (wanted_type); 3074 3075 wanted_type = TYPE_MAIN_VARIANT (wanted_type); 3076 3077 cur_param = types->param; 3078 if (!cur_param) 3079 { 3080 format_type_warning (fmt_loc, UNKNOWN_LOCATION, types, wanted_type, 3081 NULL, fki, offset_to_type_start, 3082 conversion_char); 3083 continue; 3084 } 3085 3086 cur_type = TREE_TYPE (cur_param); 3087 if (cur_type == error_mark_node) 3088 continue; 3089 orig_cur_type = cur_type; 3090 char_type_flag = 0; 3091 3092 location_t param_loc = UNKNOWN_LOCATION; 3093 if (EXPR_HAS_LOCATION (cur_param)) 3094 param_loc = EXPR_LOCATION (cur_param); 3095 else if (arglocs) 3096 { 3097 /* arg_num is 1-based. */ 3098 gcc_assert (types->arg_num > 0); 3099 param_loc = (*arglocs)[types->arg_num - 1]; 3100 } 3101 3102 STRIP_NOPS (cur_param); 3103 3104 /* Check the types of any additional pointer arguments 3105 that precede the "real" argument. */ 3106 for (i = 0; i < types->pointer_count; ++i) 3107 { 3108 if (TREE_CODE (cur_type) == POINTER_TYPE) 3109 { 3110 cur_type = TREE_TYPE (cur_type); 3111 if (cur_type == error_mark_node) 3112 break; 3113 3114 /* Check for writing through a NULL pointer. */ 3115 if (types->writing_in_flag 3116 && i == 0 3117 && cur_param != 0 3118 && integer_zerop (cur_param)) 3119 warning (OPT_Wformat_, "writing through null pointer " 3120 "(argument %d)", arg_num); 3121 3122 /* Check for reading through a NULL pointer. */ 3123 if (types->reading_from_flag 3124 && i == 0 3125 && cur_param != 0 3126 && integer_zerop (cur_param)) 3127 warning (OPT_Wformat_, "reading through null pointer " 3128 "(argument %d)", arg_num); 3129 3130 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR) 3131 cur_param = TREE_OPERAND (cur_param, 0); 3132 else 3133 cur_param = 0; 3134 3135 /* See if this is an attempt to write into a const type with 3136 scanf or with printf "%n". Note: the writing in happens 3137 at the first indirection only, if for example 3138 void * const * is passed to scanf %p; passing 3139 const void ** is simply passing an incompatible type. */ 3140 if (types->writing_in_flag 3141 && i == 0 3142 && (TYPE_READONLY (cur_type) 3143 || (cur_param != 0 3144 && (CONSTANT_CLASS_P (cur_param) 3145 || (DECL_P (cur_param) 3146 && TREE_READONLY (cur_param)))))) 3147 warning (OPT_Wformat_, "writing into constant object " 3148 "(argument %d)", arg_num); 3149 3150 /* If there are extra type qualifiers beyond the first 3151 indirection, then this makes the types technically 3152 incompatible. */ 3153 if (i > 0 3154 && pedantic 3155 && (TYPE_READONLY (cur_type) 3156 || TYPE_VOLATILE (cur_type) 3157 || TYPE_ATOMIC (cur_type) 3158 || TYPE_RESTRICT (cur_type))) 3159 warning (OPT_Wformat_, "extra type qualifiers in format " 3160 "argument (argument %d)", 3161 arg_num); 3162 3163 } 3164 else 3165 { 3166 format_type_warning (fmt_loc, param_loc, 3167 types, wanted_type, orig_cur_type, fki, 3168 offset_to_type_start, conversion_char); 3169 break; 3170 } 3171 } 3172 3173 if (i < types->pointer_count) 3174 continue; 3175 3176 cur_type = TYPE_MAIN_VARIANT (cur_type); 3177 3178 /* Check whether the argument type is a character type. This leniency 3179 only applies to certain formats, flagged with 'c'. */ 3180 if (types->char_lenient_flag) 3181 char_type_flag = (cur_type == char_type_node 3182 || cur_type == signed_char_type_node 3183 || cur_type == unsigned_char_type_node); 3184 3185 /* Check the type of the "real" argument, if there's a type we want. */ 3186 if (lang_hooks.types_compatible_p (wanted_type, cur_type)) 3187 continue; 3188 /* If we want 'void *', allow any pointer type. 3189 (Anything else would already have got a warning.) 3190 With -Wpedantic, only allow pointers to void and to character 3191 types. */ 3192 if (wanted_type == void_type_node 3193 && (!pedantic || (i == 1 && char_type_flag))) 3194 continue; 3195 /* Don't warn about differences merely in signedness, unless 3196 -Wpedantic. With -Wpedantic, warn if the type is a pointer 3197 target and not a character type, and for character types at 3198 a second level of indirection. */ 3199 if (TREE_CODE (wanted_type) == INTEGER_TYPE 3200 && TREE_CODE (cur_type) == INTEGER_TYPE 3201 && ((!pedantic && !warn_format_signedness) 3202 || (i == 0 && !warn_format_signedness) 3203 || (i == 1 && char_type_flag)) 3204 && (TYPE_UNSIGNED (wanted_type) 3205 ? wanted_type == c_common_unsigned_type (cur_type) 3206 : wanted_type == c_common_signed_type (cur_type))) 3207 continue; 3208 /* Don't warn about differences merely in signedness if we know 3209 that the current type is integer-promoted and its original type 3210 was unsigned such as that it is in the range of WANTED_TYPE. */ 3211 if (TREE_CODE (wanted_type) == INTEGER_TYPE 3212 && TREE_CODE (cur_type) == INTEGER_TYPE 3213 && warn_format_signedness 3214 && TYPE_UNSIGNED (wanted_type) 3215 && cur_param != NULL_TREE 3216 && TREE_CODE (cur_param) == NOP_EXPR) 3217 { 3218 tree t = TREE_TYPE (TREE_OPERAND (cur_param, 0)); 3219 if (TYPE_UNSIGNED (t) 3220 && cur_type == lang_hooks.types.type_promotes_to (t)) 3221 continue; 3222 } 3223 /* Likewise, "signed char", "unsigned char" and "char" are 3224 equivalent but the above test won't consider them equivalent. */ 3225 if (wanted_type == char_type_node 3226 && (!pedantic || i < 2) 3227 && char_type_flag) 3228 continue; 3229 if (types->scalar_identity_flag 3230 && (TREE_CODE (cur_type) == TREE_CODE (wanted_type) 3231 || (INTEGRAL_TYPE_P (cur_type) 3232 && INTEGRAL_TYPE_P (wanted_type))) 3233 && TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type)) 3234 continue; 3235 /* Now we have a type mismatch. */ 3236 format_type_warning (fmt_loc, param_loc, types, 3237 wanted_type, orig_cur_type, fki, 3238 offset_to_type_start, conversion_char); 3239 } 3240 } 3241 3242 /* Given type TYPE, attempt to dereference the type N times 3243 (e.g. from ("int ***", 2) to "int *") 3244 3245 Return the derefenced type, with any qualifiers 3246 such as "const" stripped from the result, or 3247 NULL if unsuccessful (e.g. TYPE is not a pointer type). */ 3248 3249 static tree 3250 deref_n_times (tree type, int n) 3251 { 3252 gcc_assert (type); 3253 3254 for (int i = n; i > 0; i--) 3255 { 3256 if (TREE_CODE (type) != POINTER_TYPE) 3257 return NULL_TREE; 3258 type = TREE_TYPE (type); 3259 } 3260 /* Strip off any "const" etc. */ 3261 return build_qualified_type (type, 0); 3262 } 3263 3264 /* Lookup the format code for FORMAT_LEN within FLI, 3265 returning the string code for expressing it, or NULL 3266 if it is not found. */ 3267 3268 static const char * 3269 get_modifier_for_format_len (const format_length_info *fli, 3270 enum format_lengths format_len) 3271 { 3272 for (; fli->name; fli++) 3273 { 3274 if (fli->index == format_len) 3275 return fli->name; 3276 if (fli->double_index == format_len) 3277 return fli->double_name; 3278 } 3279 return NULL; 3280 } 3281 3282 #if CHECKING_P 3283 3284 namespace selftest { 3285 3286 static void 3287 test_get_modifier_for_format_len () 3288 { 3289 ASSERT_STREQ ("h", 3290 get_modifier_for_format_len (printf_length_specs, FMT_LEN_h)); 3291 ASSERT_STREQ ("hh", 3292 get_modifier_for_format_len (printf_length_specs, FMT_LEN_hh)); 3293 ASSERT_STREQ ("L", 3294 get_modifier_for_format_len (printf_length_specs, FMT_LEN_L)); 3295 ASSERT_EQ (NULL, 3296 get_modifier_for_format_len (printf_length_specs, FMT_LEN_none)); 3297 } 3298 3299 } // namespace selftest 3300 3301 #endif /* CHECKING_P */ 3302 3303 /* Determine if SPEC_TYPE and ARG_TYPE are sufficiently similar for a 3304 format_type_detail using SPEC_TYPE to be offered as a suggestion for 3305 Wformat type errors where the argument has type ARG_TYPE. */ 3306 3307 static bool 3308 matching_type_p (tree spec_type, tree arg_type) 3309 { 3310 gcc_assert (spec_type); 3311 gcc_assert (arg_type); 3312 3313 /* If any of the types requires structural equality, we can't compare 3314 their canonical types. */ 3315 if (TYPE_STRUCTURAL_EQUALITY_P (spec_type) 3316 || TYPE_STRUCTURAL_EQUALITY_P (arg_type)) 3317 return false; 3318 3319 spec_type = TYPE_CANONICAL (spec_type); 3320 arg_type = TYPE_CANONICAL (arg_type); 3321 3322 if (TREE_CODE (spec_type) == INTEGER_TYPE 3323 && TREE_CODE (arg_type) == INTEGER_TYPE 3324 && (TYPE_UNSIGNED (spec_type) 3325 ? spec_type == c_common_unsigned_type (arg_type) 3326 : spec_type == c_common_signed_type (arg_type))) 3327 return true; 3328 3329 return spec_type == arg_type; 3330 } 3331 3332 /* Subroutine of get_format_for_type. 3333 3334 Generate a string containing the length modifier and conversion specifier 3335 that should be used to format arguments of type ARG_TYPE within FKI 3336 (effectively the inverse of the checking code). 3337 3338 If CONVERSION_CHAR is not zero (the first pass), the resulting suggestion 3339 is required to use it, for correcting bogus length modifiers. 3340 If CONVERSION_CHAR is zero (the second pass), then allow any suggestion 3341 that matches ARG_TYPE. 3342 3343 If successful, returns a non-NULL string which should be freed 3344 by the caller. 3345 Otherwise, returns NULL. */ 3346 3347 static char * 3348 get_format_for_type_1 (const format_kind_info *fki, tree arg_type, 3349 char conversion_char) 3350 { 3351 gcc_assert (arg_type); 3352 3353 const format_char_info *spec; 3354 for (spec = &fki->conversion_specs[0]; 3355 spec->format_chars; 3356 spec++) 3357 { 3358 if (conversion_char) 3359 if (!strchr (spec->format_chars, conversion_char)) 3360 continue; 3361 3362 tree effective_arg_type = deref_n_times (arg_type, 3363 spec->pointer_count); 3364 if (!effective_arg_type) 3365 continue; 3366 for (int i = 0; i < FMT_LEN_MAX; i++) 3367 { 3368 const format_type_detail *ftd = &spec->types[i]; 3369 if (!ftd->type) 3370 continue; 3371 if (matching_type_p (*ftd->type, effective_arg_type)) 3372 { 3373 const char *len_modifier 3374 = get_modifier_for_format_len (fki->length_char_specs, 3375 (enum format_lengths)i); 3376 if (!len_modifier) 3377 len_modifier = ""; 3378 3379 if (conversion_char) 3380 /* We found a match, using the given conversion char - the 3381 length modifier was incorrect (or absent). 3382 Provide a suggestion using the conversion char with the 3383 correct length modifier for the type. */ 3384 return xasprintf ("%s%c", len_modifier, conversion_char); 3385 else 3386 /* 2nd pass: no match was possible using the user-provided 3387 conversion char, but we do have a match without using it. 3388 Provide a suggestion using the first conversion char 3389 listed for the given type. */ 3390 return xasprintf ("%s%c", len_modifier, spec->format_chars[0]); 3391 } 3392 } 3393 } 3394 3395 return NULL; 3396 } 3397 3398 /* Generate a string containing the length modifier and conversion specifier 3399 that should be used to format arguments of type ARG_TYPE within FKI 3400 (effectively the inverse of the checking code). 3401 3402 If successful, returns a non-NULL string which should be freed 3403 by the caller. 3404 Otherwise, returns NULL. */ 3405 3406 static char * 3407 get_format_for_type (const format_kind_info *fki, tree arg_type, 3408 char conversion_char) 3409 { 3410 gcc_assert (arg_type); 3411 gcc_assert (conversion_char); 3412 3413 /* First pass: look for a format_char_info containing CONVERSION_CHAR 3414 If we find one, then presumably the length modifier was incorrect 3415 (or absent). */ 3416 char *result = get_format_for_type_1 (fki, arg_type, conversion_char); 3417 if (result) 3418 return result; 3419 3420 /* Second pass: we didn't find a match for CONVERSION_CHAR, so try 3421 matching just on the type. */ 3422 return get_format_for_type_1 (fki, arg_type, '\0'); 3423 } 3424 3425 /* Attempt to get a string for use as a replacement fix-it hint for the 3426 source range in FMT_LOC. 3427 3428 Preserve all of the text within the range of FMT_LOC up to 3429 OFFSET_TO_TYPE_START, replacing the rest with an appropriate 3430 length modifier and conversion specifier for ARG_TYPE, attempting 3431 to keep the user-provided CONVERSION_CHAR if possible. 3432 3433 For example, given a long vs long long mismatch for arg5 here: 3434 3435 000000000111111111122222222223333333333| 3436 123456789012345678901234567890123456789` column numbers 3437 0000000000111111111122| 3438 0123456789012345678901` string offsets 3439 V~~~~~~~~ : range of FMT_LOC, from cols 23-31 3440 sprintf (d, "before %-+*.*lld after", arg3, arg4, arg5); 3441 ^ ^ 3442 | ` CONVERSION_CHAR: 'd' 3443 type starts here 3444 3445 where OFFSET_TO_TYPE_START is 13 (the offset to the "lld" within the 3446 STRING_CST), where the user provided: 3447 %-+*.*lld 3448 the result (assuming "long" argument 5) should be: 3449 %-+*.*ld 3450 3451 If successful, returns a non-NULL string which should be freed 3452 by the caller. 3453 Otherwise, returns NULL. */ 3454 3455 static char * 3456 get_corrected_substring (const substring_loc &fmt_loc, 3457 format_wanted_type *type, tree arg_type, 3458 const format_kind_info *fki, 3459 int offset_to_type_start, char conversion_char) 3460 { 3461 /* Attempt to provide hints for argument types, but not for field widths 3462 and precisions. */ 3463 if (!arg_type) 3464 return NULL; 3465 if (type->kind != CF_KIND_FORMAT) 3466 return NULL; 3467 3468 /* Locate the current code within the source range, rejecting 3469 any awkward cases where the format string occupies more than 3470 one line. 3471 Lookup the place where the type starts (including any length 3472 modifiers), getting it as the caret location. */ 3473 substring_loc type_loc (fmt_loc); 3474 type_loc.set_caret_index (offset_to_type_start); 3475 3476 location_t fmt_substring_loc; 3477 const char *err = type_loc.get_location (&fmt_substring_loc); 3478 if (err) 3479 return NULL; 3480 3481 source_range fmt_substring_range 3482 = get_range_from_loc (line_table, fmt_substring_loc); 3483 3484 expanded_location caret 3485 = expand_location_to_spelling_point (fmt_substring_loc); 3486 expanded_location start 3487 = expand_location_to_spelling_point (fmt_substring_range.m_start); 3488 expanded_location finish 3489 = expand_location_to_spelling_point (fmt_substring_range.m_finish); 3490 if (caret.file != start.file) 3491 return NULL; 3492 if (start.file != finish.file) 3493 return NULL; 3494 if (caret.line != start.line) 3495 return NULL; 3496 if (start.line != finish.line) 3497 return NULL; 3498 if (start.column > caret.column) 3499 return NULL; 3500 if (start.column > finish.column) 3501 return NULL; 3502 if (caret.column > finish.column) 3503 return NULL; 3504 3505 int line_width; 3506 const char *line = location_get_source_line (start.file, start.line, 3507 &line_width); 3508 if (line == NULL) 3509 return NULL; 3510 3511 /* If we got this far, then we have the line containing the 3512 existing conversion specification. 3513 3514 Generate a trimmed copy, containing the prefix part of the conversion 3515 specification, up to the (but not including) the length modifier. 3516 In the above example, this would be "%-+*.*". */ 3517 const char *current_content = line + start.column - 1; 3518 int length_up_to_type = caret.column - start.column; 3519 char *prefix = xstrndup (current_content, length_up_to_type); 3520 3521 /* Now attempt to generate a suggestion for the rest of the specification 3522 (length modifier and conversion char), based on ARG_TYPE and 3523 CONVERSION_CHAR. 3524 In the above example, this would be "ld". */ 3525 char *format_for_type = get_format_for_type (fki, arg_type, conversion_char); 3526 if (!format_for_type) 3527 { 3528 free (prefix); 3529 return NULL; 3530 } 3531 3532 /* Success. Generate the resulting suggestion for the whole range of 3533 FMT_LOC by concatenating the two strings. 3534 In the above example, this would be "%-+*.*ld". */ 3535 char *result = concat (prefix, format_for_type, NULL); 3536 free (format_for_type); 3537 free (prefix); 3538 return result; 3539 } 3540 3541 /* Give a warning about a format argument of different type from that expected. 3542 The range of the diagnostic is taken from WHOLE_FMT_LOC; the caret location 3543 is based on the location of the char at TYPE->offset_loc. 3544 PARAM_LOC is the location of the relevant argument, or UNKNOWN_LOCATION 3545 if this is unavailable. 3546 WANTED_TYPE is the type the argument should have, 3547 possibly stripped of pointer dereferences. The description (such as "field 3548 precision"), the placement in the format string, a possibly more 3549 friendly name of WANTED_TYPE, and the number of pointer dereferences 3550 are taken from TYPE. ARG_TYPE is the type of the actual argument, 3551 or NULL if it is missing. 3552 3553 OFFSET_TO_TYPE_START is the offset within the execution-charset encoded 3554 format string to where type information begins for the conversion 3555 (the length modifier and conversion specifier). 3556 CONVERSION_CHAR is the user-provided conversion specifier. 3557 3558 For example, given a type mismatch for argument 5 here: 3559 3560 00000000011111111112222222222333333333344444444445555555555| 3561 12345678901234567890123456789012345678901234567890123456789` column numbers 3562 0000000000111111111122| 3563 0123456789012345678901` offsets within STRING_CST 3564 V~~~~~~~~ : range of WHOLE_FMT_LOC, from cols 23-31 3565 sprintf (d, "before %-+*.*lld after", int_expr, int_expr, long_expr); 3566 ^ ^ ^~~~~~~~~ 3567 | ` CONVERSION_CHAR: 'd' PARAM_LOC 3568 type starts here 3569 3570 OFFSET_TO_TYPE_START is 13, the offset to the "lld" within the 3571 STRING_CST. */ 3572 3573 static void 3574 format_type_warning (const substring_loc &whole_fmt_loc, 3575 location_t param_loc, 3576 format_wanted_type *type, 3577 tree wanted_type, tree arg_type, 3578 const format_kind_info *fki, 3579 int offset_to_type_start, 3580 char conversion_char) 3581 { 3582 enum format_specifier_kind kind = type->kind; 3583 const char *wanted_type_name = type->wanted_type_name; 3584 const char *format_start = type->format_start; 3585 int format_length = type->format_length; 3586 int pointer_count = type->pointer_count; 3587 int arg_num = type->arg_num; 3588 3589 char *p; 3590 /* If ARG_TYPE is a typedef with a misleading name (for example, 3591 size_t but not the standard size_t expected by printf %zu), avoid 3592 printing the typedef name. */ 3593 if (wanted_type_name 3594 && arg_type 3595 && TYPE_NAME (arg_type) 3596 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL 3597 && DECL_NAME (TYPE_NAME (arg_type)) 3598 && !strcmp (wanted_type_name, 3599 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2))) 3600 arg_type = TYPE_MAIN_VARIANT (arg_type); 3601 /* The format type and name exclude any '*' for pointers, so those 3602 must be formatted manually. For all the types we currently have, 3603 this is adequate, but formats taking pointers to functions or 3604 arrays would require the full type to be built up in order to 3605 print it with %T. */ 3606 p = (char *) alloca (pointer_count + 2); 3607 if (pointer_count == 0) 3608 p[0] = 0; 3609 else if (c_dialect_cxx ()) 3610 { 3611 memset (p, '*', pointer_count); 3612 p[pointer_count] = 0; 3613 } 3614 else 3615 { 3616 p[0] = ' '; 3617 memset (p + 1, '*', pointer_count); 3618 p[pointer_count + 1] = 0; 3619 } 3620 3621 /* WHOLE_FMT_LOC has the caret at the end of the range. 3622 Set the caret to be at the offset from TYPE. Subtract one 3623 from the offset for the same reason as in format_warning_at_char. */ 3624 substring_loc fmt_loc (whole_fmt_loc); 3625 fmt_loc.set_caret_index (type->offset_loc - 1); 3626 3627 /* Get a string for use as a replacement fix-it hint for the range in 3628 fmt_loc, or NULL. */ 3629 char *corrected_substring 3630 = get_corrected_substring (fmt_loc, type, arg_type, fki, 3631 offset_to_type_start, conversion_char); 3632 3633 if (wanted_type_name) 3634 { 3635 if (arg_type) 3636 format_warning_at_substring 3637 (fmt_loc, param_loc, 3638 corrected_substring, OPT_Wformat_, 3639 "%s %<%s%.*s%> expects argument of type %<%s%s%>, " 3640 "but argument %d has type %qT", 3641 gettext (kind_descriptions[kind]), 3642 (kind == CF_KIND_FORMAT ? "%" : ""), 3643 format_length, format_start, 3644 wanted_type_name, p, arg_num, arg_type); 3645 else 3646 format_warning_at_substring 3647 (fmt_loc, param_loc, 3648 corrected_substring, OPT_Wformat_, 3649 "%s %<%s%.*s%> expects a matching %<%s%s%> argument", 3650 gettext (kind_descriptions[kind]), 3651 (kind == CF_KIND_FORMAT ? "%" : ""), 3652 format_length, format_start, wanted_type_name, p); 3653 } 3654 else 3655 { 3656 if (arg_type) 3657 format_warning_at_substring 3658 (fmt_loc, param_loc, 3659 corrected_substring, OPT_Wformat_, 3660 "%s %<%s%.*s%> expects argument of type %<%T%s%>, " 3661 "but argument %d has type %qT", 3662 gettext (kind_descriptions[kind]), 3663 (kind == CF_KIND_FORMAT ? "%" : ""), 3664 format_length, format_start, 3665 wanted_type, p, arg_num, arg_type); 3666 else 3667 format_warning_at_substring 3668 (fmt_loc, param_loc, 3669 corrected_substring, OPT_Wformat_, 3670 "%s %<%s%.*s%> expects a matching %<%T%s%> argument", 3671 gettext (kind_descriptions[kind]), 3672 (kind == CF_KIND_FORMAT ? "%" : ""), 3673 format_length, format_start, wanted_type, p); 3674 } 3675 3676 free (corrected_substring); 3677 } 3678 3679 3680 /* Given a format_char_info array FCI, and a character C, this function 3681 returns the index into the conversion_specs where that specifier's 3682 data is located. The character must exist. */ 3683 static unsigned int 3684 find_char_info_specifier_index (const format_char_info *fci, int c) 3685 { 3686 unsigned i; 3687 3688 for (i = 0; fci->format_chars; i++, fci++) 3689 if (strchr (fci->format_chars, c)) 3690 return i; 3691 3692 /* We shouldn't be looking for a non-existent specifier. */ 3693 gcc_unreachable (); 3694 } 3695 3696 /* Given a format_length_info array FLI, and a character C, this 3697 function returns the index into the conversion_specs where that 3698 modifier's data is located. The character must exist. */ 3699 static unsigned int 3700 find_length_info_modifier_index (const format_length_info *fli, int c) 3701 { 3702 unsigned i; 3703 3704 for (i = 0; fli->name; i++, fli++) 3705 if (strchr (fli->name, c)) 3706 return i; 3707 3708 /* We shouldn't be looking for a non-existent modifier. */ 3709 gcc_unreachable (); 3710 } 3711 3712 /* Determine the type of HOST_WIDE_INT in the code being compiled for 3713 use in GCC's __asm_fprintf__ custom format attribute. You must 3714 have set dynamic_format_types before calling this function. */ 3715 static void 3716 init_dynamic_asm_fprintf_info (void) 3717 { 3718 static tree hwi; 3719 3720 if (!hwi) 3721 { 3722 format_length_info *new_asm_fprintf_length_specs; 3723 unsigned int i; 3724 3725 /* Find the underlying type for HOST_WIDE_INT. For the %w 3726 length modifier to work, one must have issued: "typedef 3727 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 3728 prior to using that modifier. */ 3729 hwi = maybe_get_identifier ("__gcc_host_wide_int__"); 3730 if (!hwi) 3731 { 3732 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 3733 return; 3734 } 3735 hwi = identifier_global_value (hwi); 3736 if (!hwi || TREE_CODE (hwi) != TYPE_DECL) 3737 { 3738 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 3739 return; 3740 } 3741 hwi = DECL_ORIGINAL_TYPE (hwi); 3742 gcc_assert (hwi); 3743 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node) 3744 { 3745 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>" 3746 " or %<long long%>"); 3747 return; 3748 } 3749 3750 /* Create a new (writable) copy of asm_fprintf_length_specs. */ 3751 new_asm_fprintf_length_specs = (format_length_info *) 3752 xmemdup (asm_fprintf_length_specs, 3753 sizeof (asm_fprintf_length_specs), 3754 sizeof (asm_fprintf_length_specs)); 3755 3756 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 3757 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w'); 3758 if (hwi == long_integer_type_node) 3759 new_asm_fprintf_length_specs[i].index = FMT_LEN_l; 3760 else if (hwi == long_long_integer_type_node) 3761 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll; 3762 else 3763 gcc_unreachable (); 3764 3765 /* Assign the new data for use. */ 3766 dynamic_format_types[asm_fprintf_format_type].length_char_specs = 3767 new_asm_fprintf_length_specs; 3768 } 3769 } 3770 3771 /* Determine the type of a "locus" in the code being compiled for use 3772 in GCC's __gcc_gfc__ custom format attribute. You must have set 3773 dynamic_format_types before calling this function. */ 3774 static void 3775 init_dynamic_gfc_info (void) 3776 { 3777 if (!locus) 3778 { 3779 static format_char_info *gfc_fci; 3780 3781 /* For the GCC __gcc_gfc__ custom format specifier to work, one 3782 must have declared 'locus' prior to using this attribute. If 3783 we haven't seen this declarations then you shouldn't use the 3784 specifier requiring that type. */ 3785 if ((locus = maybe_get_identifier ("locus"))) 3786 { 3787 locus = identifier_global_value (locus); 3788 if (locus) 3789 { 3790 if (TREE_CODE (locus) != TYPE_DECL 3791 || TREE_TYPE (locus) == error_mark_node) 3792 { 3793 error ("%<locus%> is not defined as a type"); 3794 locus = 0; 3795 } 3796 else 3797 locus = TREE_TYPE (locus); 3798 } 3799 } 3800 3801 /* Assign the new data for use. */ 3802 3803 /* Handle the __gcc_gfc__ format specifics. */ 3804 if (!gfc_fci) 3805 dynamic_format_types[gcc_gfc_format_type].conversion_specs = 3806 gfc_fci = (format_char_info *) 3807 xmemdup (gcc_gfc_char_table, 3808 sizeof (gcc_gfc_char_table), 3809 sizeof (gcc_gfc_char_table)); 3810 if (locus) 3811 { 3812 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L'); 3813 gfc_fci[i].types[0].type = &locus; 3814 gfc_fci[i].pointer_count = 1; 3815 } 3816 } 3817 } 3818 3819 /* Determine the types of "tree" and "location_t" in the code being 3820 compiled for use in GCC's diagnostic custom format attributes. You 3821 must have set dynamic_format_types before calling this function. */ 3822 static void 3823 init_dynamic_diag_info (void) 3824 { 3825 /* For the GCC-diagnostics custom format specifiers to work, one 3826 must have declared 'tree' and 'location_t' prior to using those 3827 attributes. If we haven't seen these declarations then 3828 the specifiers requiring these types shouldn't be used. 3829 However we don't force a hard ICE because we may see only one 3830 or the other type. */ 3831 if (tree loc = maybe_get_identifier ("location_t")) 3832 { 3833 loc = identifier_global_value (loc); 3834 if (loc && TREE_CODE (loc) != TYPE_DECL) 3835 error ("%<location_t%> is not defined as a type"); 3836 } 3837 3838 /* Initialize the global tree node type local to this file. */ 3839 if (!local_tree_type_node 3840 || local_tree_type_node == void_type_node) 3841 { 3842 /* We need to grab the underlying 'union tree_node' so peek into 3843 an extra type level. */ 3844 if ((local_tree_type_node = maybe_get_identifier ("tree"))) 3845 { 3846 local_tree_type_node = identifier_global_value (local_tree_type_node); 3847 if (local_tree_type_node) 3848 { 3849 if (TREE_CODE (local_tree_type_node) != TYPE_DECL) 3850 { 3851 error ("%<tree%> is not defined as a type"); 3852 local_tree_type_node = 0; 3853 } 3854 else if (TREE_CODE (TREE_TYPE (local_tree_type_node)) 3855 != POINTER_TYPE) 3856 { 3857 error ("%<tree%> is not defined as a pointer type"); 3858 local_tree_type_node = 0; 3859 } 3860 else 3861 local_tree_type_node = 3862 TREE_TYPE (TREE_TYPE (local_tree_type_node)); 3863 } 3864 } 3865 else 3866 local_tree_type_node = void_type_node; 3867 } 3868 3869 /* Similar to the above but for gcall*. */ 3870 if (!local_gcall_ptr_node 3871 || local_gcall_ptr_node == void_type_node) 3872 { 3873 if ((local_gcall_ptr_node = maybe_get_identifier ("gcall"))) 3874 { 3875 local_gcall_ptr_node 3876 = identifier_global_value (local_gcall_ptr_node); 3877 if (local_gcall_ptr_node) 3878 { 3879 if (TREE_CODE (local_gcall_ptr_node) != TYPE_DECL) 3880 { 3881 error ("%<gcall%> is not defined as a type"); 3882 local_gcall_ptr_node = 0; 3883 } 3884 else 3885 local_gcall_ptr_node = TREE_TYPE (local_gcall_ptr_node); 3886 } 3887 } 3888 else 3889 local_gcall_ptr_node = void_type_node; 3890 } 3891 3892 static tree hwi; 3893 3894 if (!hwi) 3895 { 3896 static format_length_info *diag_ls; 3897 unsigned int i; 3898 3899 /* Find the underlying type for HOST_WIDE_INT. For the 'w' 3900 length modifier to work, one must have issued: "typedef 3901 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 3902 prior to using that modifier. */ 3903 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__"))) 3904 { 3905 hwi = identifier_global_value (hwi); 3906 if (hwi) 3907 { 3908 if (TREE_CODE (hwi) != TYPE_DECL) 3909 { 3910 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 3911 hwi = 0; 3912 } 3913 else 3914 { 3915 hwi = DECL_ORIGINAL_TYPE (hwi); 3916 gcc_assert (hwi); 3917 if (hwi != long_integer_type_node 3918 && hwi != long_long_integer_type_node) 3919 { 3920 error ("%<__gcc_host_wide_int__%> is not defined" 3921 " as %<long%> or %<long long%>"); 3922 hwi = 0; 3923 } 3924 } 3925 } 3926 } 3927 3928 /* Assign the new data for use. */ 3929 3930 /* All the GCC diag formats use the same length specs. */ 3931 if (!diag_ls) 3932 dynamic_format_types[gcc_diag_format_type].length_char_specs = 3933 dynamic_format_types[gcc_tdiag_format_type].length_char_specs = 3934 dynamic_format_types[gcc_cdiag_format_type].length_char_specs = 3935 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs = 3936 diag_ls = (format_length_info *) 3937 xmemdup (gcc_diag_length_specs, 3938 sizeof (gcc_diag_length_specs), 3939 sizeof (gcc_diag_length_specs)); 3940 if (hwi) 3941 { 3942 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 3943 i = find_length_info_modifier_index (diag_ls, 'w'); 3944 if (hwi == long_integer_type_node) 3945 diag_ls[i].index = FMT_LEN_l; 3946 else if (hwi == long_long_integer_type_node) 3947 diag_ls[i].index = FMT_LEN_ll; 3948 else 3949 gcc_unreachable (); 3950 } 3951 } 3952 3953 /* It's safe to "re-initialize these to the same values. */ 3954 dynamic_format_types[gcc_diag_format_type].conversion_specs = 3955 gcc_diag_char_table; 3956 dynamic_format_types[gcc_tdiag_format_type].conversion_specs = 3957 gcc_tdiag_char_table; 3958 dynamic_format_types[gcc_cdiag_format_type].conversion_specs = 3959 gcc_cdiag_char_table; 3960 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs = 3961 gcc_cxxdiag_char_table; 3962 } 3963 3964 #ifdef TARGET_FORMAT_TYPES 3965 extern const format_kind_info TARGET_FORMAT_TYPES[]; 3966 #endif 3967 3968 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES 3969 extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[]; 3970 #endif 3971 #ifdef TARGET_OVERRIDES_FORMAT_INIT 3972 extern void TARGET_OVERRIDES_FORMAT_INIT (void); 3973 #endif 3974 3975 /* Attributes such as "printf" are equivalent to those such as 3976 "gnu_printf" unless this is overridden by a target. */ 3977 static const target_ovr_attr gnu_target_overrides_format_attributes[] = 3978 { 3979 { "gnu_printf", "printf" }, 3980 { "gnu_scanf", "scanf" }, 3981 { "gnu_strftime", "strftime" }, 3982 { "gnu_strfmon", "strfmon" }, 3983 { NULL, NULL } 3984 }; 3985 3986 /* Translate to unified attribute name. This is used in decode_format_type and 3987 decode_format_attr. In attr_name the user specified argument is passed. It 3988 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES 3989 or the attr_name passed to this function, if there is no matching entry. */ 3990 static const char * 3991 convert_format_name_to_system_name (const char *attr_name) 3992 { 3993 int i; 3994 3995 if (attr_name == NULL || *attr_name == 0 3996 || strncmp (attr_name, "gcc_", 4) == 0) 3997 return attr_name; 3998 #ifdef TARGET_OVERRIDES_FORMAT_INIT 3999 TARGET_OVERRIDES_FORMAT_INIT (); 4000 #endif 4001 4002 #ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES 4003 /* Check if format attribute is overridden by target. */ 4004 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL 4005 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0) 4006 { 4007 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i) 4008 { 4009 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src, 4010 attr_name)) 4011 return attr_name; 4012 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst, 4013 attr_name)) 4014 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src; 4015 } 4016 } 4017 #endif 4018 /* Otherwise default to gnu format. */ 4019 for (i = 0; 4020 gnu_target_overrides_format_attributes[i].named_attr_src != NULL; 4021 ++i) 4022 { 4023 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src, 4024 attr_name)) 4025 return attr_name; 4026 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst, 4027 attr_name)) 4028 return gnu_target_overrides_format_attributes[i].named_attr_src; 4029 } 4030 4031 return attr_name; 4032 } 4033 4034 /* Handle a "format" attribute; arguments as in 4035 struct attribute_spec.handler. */ 4036 tree 4037 handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args, 4038 int flags, bool *no_add_attrs) 4039 { 4040 tree type = *node; 4041 function_format_info info; 4042 4043 #ifdef TARGET_FORMAT_TYPES 4044 /* If the target provides additional format types, we need to 4045 add them to FORMAT_TYPES at first use. */ 4046 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types) 4047 { 4048 dynamic_format_types = XNEWVEC (format_kind_info, 4049 n_format_types + TARGET_N_FORMAT_TYPES); 4050 memcpy (dynamic_format_types, format_types_orig, 4051 sizeof (format_types_orig)); 4052 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES, 4053 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0])); 4054 4055 format_types = dynamic_format_types; 4056 /* Provide a reference for the first potential external type. */ 4057 first_target_format_type = n_format_types; 4058 n_format_types += TARGET_N_FORMAT_TYPES; 4059 } 4060 #endif 4061 4062 /* Canonicalize name of format function. */ 4063 if (TREE_CODE (TREE_VALUE (args)) == IDENTIFIER_NODE) 4064 TREE_VALUE (args) = canonicalize_attr_name (TREE_VALUE (args)); 4065 4066 if (!decode_format_attr (args, &info, 0)) 4067 { 4068 *no_add_attrs = true; 4069 return NULL_TREE; 4070 } 4071 4072 if (prototype_p (type)) 4073 { 4074 if (!check_format_string (type, info.format_num, flags, 4075 no_add_attrs, info.format_type)) 4076 return NULL_TREE; 4077 4078 if (info.first_arg_num != 0) 4079 { 4080 unsigned HOST_WIDE_INT arg_num = 1; 4081 function_args_iterator iter; 4082 tree arg_type; 4083 4084 /* Verify that first_arg_num points to the last arg, 4085 the ... */ 4086 FOREACH_FUNCTION_ARGS (type, arg_type, iter) 4087 arg_num++; 4088 4089 if (arg_num != info.first_arg_num) 4090 { 4091 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 4092 error ("args to be formatted is not %<...%>"); 4093 *no_add_attrs = true; 4094 return NULL_TREE; 4095 } 4096 } 4097 } 4098 4099 /* Check if this is a strftime variant. Just for this variant 4100 FMT_FLAG_ARG_CONVERT is not set. */ 4101 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0 4102 && info.first_arg_num != 0) 4103 { 4104 error ("strftime formats cannot format arguments"); 4105 *no_add_attrs = true; 4106 return NULL_TREE; 4107 } 4108 4109 /* If this is a custom GCC-internal format type, we have to 4110 initialize certain bits at runtime. */ 4111 if (info.format_type == asm_fprintf_format_type 4112 || info.format_type == gcc_gfc_format_type 4113 || info.format_type == gcc_diag_format_type 4114 || info.format_type == gcc_tdiag_format_type 4115 || info.format_type == gcc_cdiag_format_type 4116 || info.format_type == gcc_cxxdiag_format_type) 4117 { 4118 /* Our first time through, we have to make sure that our 4119 format_type data is allocated dynamically and is modifiable. */ 4120 if (!dynamic_format_types) 4121 format_types = dynamic_format_types = (format_kind_info *) 4122 xmemdup (format_types_orig, sizeof (format_types_orig), 4123 sizeof (format_types_orig)); 4124 4125 /* If this is format __asm_fprintf__, we have to initialize 4126 GCC's notion of HOST_WIDE_INT for checking %wd. */ 4127 if (info.format_type == asm_fprintf_format_type) 4128 init_dynamic_asm_fprintf_info (); 4129 /* If this is format __gcc_gfc__, we have to initialize GCC's 4130 notion of 'locus' at runtime for %L. */ 4131 else if (info.format_type == gcc_gfc_format_type) 4132 init_dynamic_gfc_info (); 4133 /* If this is one of the diagnostic attributes, then we have to 4134 initialize 'location_t' and 'tree' at runtime. */ 4135 else if (info.format_type == gcc_diag_format_type 4136 || info.format_type == gcc_tdiag_format_type 4137 || info.format_type == gcc_cdiag_format_type 4138 || info.format_type == gcc_cxxdiag_format_type) 4139 init_dynamic_diag_info (); 4140 else 4141 gcc_unreachable (); 4142 } 4143 4144 return NULL_TREE; 4145 } 4146 4147 #if CHECKING_P 4148 4149 namespace selftest { 4150 4151 /* Selftests of location handling. */ 4152 4153 /* Get the format_kind_info with the given name. */ 4154 4155 static const format_kind_info * 4156 get_info (const char *name) 4157 { 4158 int idx = decode_format_type (name); 4159 const format_kind_info *fki = &format_types[idx]; 4160 ASSERT_STREQ (fki->name, name); 4161 return fki; 4162 } 4163 4164 /* Verify that get_format_for_type (FKI, TYPE, CONVERSION_CHAR) 4165 is EXPECTED_FORMAT. */ 4166 4167 static void 4168 assert_format_for_type_streq (const location &loc, const format_kind_info *fki, 4169 const char *expected_format, tree type, 4170 char conversion_char) 4171 { 4172 gcc_assert (fki); 4173 gcc_assert (expected_format); 4174 gcc_assert (type); 4175 4176 char *actual_format = get_format_for_type (fki, type, conversion_char); 4177 ASSERT_STREQ_AT (loc, expected_format, actual_format); 4178 free (actual_format); 4179 } 4180 4181 /* Selftests for get_format_for_type. */ 4182 4183 #define ASSERT_FORMAT_FOR_TYPE_STREQ(EXPECTED_FORMAT, TYPE, CONVERSION_CHAR) \ 4184 assert_format_for_type_streq (SELFTEST_LOCATION, (fki), (EXPECTED_FORMAT), \ 4185 (TYPE), (CONVERSION_CHAR)) 4186 4187 /* Selftest for get_format_for_type for "printf"-style functions. */ 4188 4189 static void 4190 test_get_format_for_type_printf () 4191 { 4192 const format_kind_info *fki = get_info ("gnu_printf"); 4193 ASSERT_NE (fki, NULL); 4194 4195 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'i'); 4196 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'i'); 4197 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'o'); 4198 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'o'); 4199 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'x'); 4200 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'x'); 4201 ASSERT_FORMAT_FOR_TYPE_STREQ ("f", double_type_node, 'X'); 4202 ASSERT_FORMAT_FOR_TYPE_STREQ ("Lf", long_double_type_node, 'X'); 4203 ASSERT_FORMAT_FOR_TYPE_STREQ ("d", integer_type_node, 'd'); 4204 ASSERT_FORMAT_FOR_TYPE_STREQ ("i", integer_type_node, 'i'); 4205 ASSERT_FORMAT_FOR_TYPE_STREQ ("o", integer_type_node, 'o'); 4206 ASSERT_FORMAT_FOR_TYPE_STREQ ("x", integer_type_node, 'x'); 4207 ASSERT_FORMAT_FOR_TYPE_STREQ ("X", integer_type_node, 'X'); 4208 ASSERT_FORMAT_FOR_TYPE_STREQ ("d", unsigned_type_node, 'd'); 4209 ASSERT_FORMAT_FOR_TYPE_STREQ ("i", unsigned_type_node, 'i'); 4210 ASSERT_FORMAT_FOR_TYPE_STREQ ("o", unsigned_type_node, 'o'); 4211 ASSERT_FORMAT_FOR_TYPE_STREQ ("x", unsigned_type_node, 'x'); 4212 ASSERT_FORMAT_FOR_TYPE_STREQ ("X", unsigned_type_node, 'X'); 4213 ASSERT_FORMAT_FOR_TYPE_STREQ ("ld", long_integer_type_node, 'd'); 4214 ASSERT_FORMAT_FOR_TYPE_STREQ ("li", long_integer_type_node, 'i'); 4215 ASSERT_FORMAT_FOR_TYPE_STREQ ("lx", long_integer_type_node, 'x'); 4216 ASSERT_FORMAT_FOR_TYPE_STREQ ("lo", long_unsigned_type_node, 'o'); 4217 ASSERT_FORMAT_FOR_TYPE_STREQ ("lx", long_unsigned_type_node, 'x'); 4218 ASSERT_FORMAT_FOR_TYPE_STREQ ("lld", long_long_integer_type_node, 'd'); 4219 ASSERT_FORMAT_FOR_TYPE_STREQ ("lli", long_long_integer_type_node, 'i'); 4220 ASSERT_FORMAT_FOR_TYPE_STREQ ("llo", long_long_unsigned_type_node, 'o'); 4221 ASSERT_FORMAT_FOR_TYPE_STREQ ("llx", long_long_unsigned_type_node, 'x'); 4222 ASSERT_FORMAT_FOR_TYPE_STREQ ("s", build_pointer_type (char_type_node), 'i'); 4223 } 4224 4225 /* Selftest for get_format_for_type for "scanf"-style functions. */ 4226 4227 static void 4228 test_get_format_for_type_scanf () 4229 { 4230 const format_kind_info *fki = get_info ("gnu_scanf"); 4231 ASSERT_NE (fki, NULL); 4232 ASSERT_FORMAT_FOR_TYPE_STREQ ("d", build_pointer_type (integer_type_node), 'd'); 4233 ASSERT_FORMAT_FOR_TYPE_STREQ ("u", build_pointer_type (unsigned_type_node), 'u'); 4234 ASSERT_FORMAT_FOR_TYPE_STREQ ("ld", 4235 build_pointer_type (long_integer_type_node), 'd'); 4236 ASSERT_FORMAT_FOR_TYPE_STREQ ("lu", 4237 build_pointer_type (long_unsigned_type_node), 'u'); 4238 ASSERT_FORMAT_FOR_TYPE_STREQ 4239 ("lld", build_pointer_type (long_long_integer_type_node), 'd'); 4240 ASSERT_FORMAT_FOR_TYPE_STREQ 4241 ("llu", build_pointer_type (long_long_unsigned_type_node), 'u'); 4242 ASSERT_FORMAT_FOR_TYPE_STREQ ("e", build_pointer_type (float_type_node), 'e'); 4243 ASSERT_FORMAT_FOR_TYPE_STREQ ("le", build_pointer_type (double_type_node), 'e'); 4244 } 4245 4246 #undef ASSERT_FORMAT_FOR_TYPE_STREQ 4247 4248 /* Run all of the selftests within this file. */ 4249 4250 void 4251 c_format_c_tests () 4252 { 4253 test_get_modifier_for_format_len (); 4254 test_get_format_for_type_printf (); 4255 test_get_format_for_type_scanf (); 4256 } 4257 4258 } // namespace selftest 4259 4260 #endif /* CHECKING_P */ 4261 4262 #include "gt-c-family-c-format.h" 4263