1/* Check calls to formatted I/O functions (-Wformat). 2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 3 2001, 2002, 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc. 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify it under 8the terms of the GNU General Public License as published by the Free 9Software Foundation; either version 3, or (at your option) any later 10version. 11 12GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13WARRANTY; without even the implied warranty of MERCHANTABILITY or 14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING3. If not see 19<http://www.gnu.org/licenses/>. */ 20 21#include "config.h" 22#include "system.h" 23#include "coretypes.h" 24#include "tm.h" 25#include "tree.h" 26#include "flags.h" 27#include "c-common.h" 28#include "toplev.h" 29#include "intl.h" 30#include "diagnostic.h" 31#include "langhooks.h" 32#include "c-format.h" 33#include "alloc-pool.h" 34 35/* Set format warning options according to a -Wformat=n option. */ 36 37void 38set_Wformat (int setting) 39{ 40 warn_format = setting; 41 warn_format_extra_args = setting; 42 warn_format_zero_length = setting; 43 warn_format_contains_nul = setting; 44 if (setting != 1) 45 { 46 warn_format_nonliteral = setting; 47 warn_format_security = setting; 48 warn_format_y2k = setting; 49 } 50 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */ 51 if (setting) 52 warn_nonnull = setting; 53} 54 55 56/* Handle attributes associated with format checking. */ 57 58/* This must be in the same order as format_types, except for 59 format_type_error. Target-specific format types do not have 60 matching enum values. */ 61enum format_type { printf_format_type, asm_fprintf_format_type, 62 gcc_diag_format_type, gcc_tdiag_format_type, 63 gcc_cdiag_format_type, 64 gcc_cxxdiag_format_type, gcc_gfc_format_type, 65 format_type_error = -1}; 66 67typedef struct function_format_info 68{ 69 int format_type; /* type of format (printf, scanf, etc.) */ 70 unsigned HOST_WIDE_INT format_num; /* number of format argument */ 71 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */ 72} function_format_info; 73 74static bool decode_format_attr (tree, function_format_info *, int); 75static int decode_format_type (const char *); 76 77static bool check_format_string (tree argument, 78 unsigned HOST_WIDE_INT format_num, 79 int flags, bool *no_add_attrs); 80static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value, 81 int validated_p); 82static const char *convert_format_name_to_system_name (const char *attr_name); 83static bool cmp_attribs (const char *tattr_name, const char *attr_name); 84 85/* Handle a "format_arg" attribute; arguments as in 86 struct attribute_spec.handler. */ 87tree 88handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name), 89 tree args, int flags, bool *no_add_attrs) 90{ 91 tree type = *node; 92 tree format_num_expr = TREE_VALUE (args); 93 unsigned HOST_WIDE_INT format_num = 0; 94 tree argument; 95 96 if (!get_constant (format_num_expr, &format_num, 0)) 97 { 98 error ("format string has invalid operand number"); 99 *no_add_attrs = true; 100 return NULL_TREE; 101 } 102 103 argument = TYPE_ARG_TYPES (type); 104 if (argument) 105 { 106 if (!check_format_string (argument, format_num, flags, no_add_attrs)) 107 return NULL_TREE; 108 } 109 110 if (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE 111 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) 112 != char_type_node)) 113 { 114 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 115 error ("function does not return string type"); 116 *no_add_attrs = true; 117 return NULL_TREE; 118 } 119 120 return NULL_TREE; 121} 122 123/* Verify that the format_num argument is actually a string, in case 124 the format attribute is in error. */ 125static bool 126check_format_string (tree argument, unsigned HOST_WIDE_INT format_num, 127 int flags, bool *no_add_attrs) 128{ 129 unsigned HOST_WIDE_INT i; 130 131 for (i = 1; i != format_num; i++) 132 { 133 if (argument == 0) 134 break; 135 argument = TREE_CHAIN (argument); 136 } 137 138 if (!argument 139 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE 140 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument))) 141 != char_type_node)) 142 { 143 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 144 error ("format string argument not a string type"); 145 *no_add_attrs = true; 146 return false; 147 } 148 149 return true; 150} 151 152/* Verify EXPR is a constant, and store its value. 153 If validated_p is true there should be no errors. 154 Returns true on success, false otherwise. */ 155static bool 156get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p) 157{ 158 if (TREE_CODE (expr) != INTEGER_CST || TREE_INT_CST_HIGH (expr) != 0) 159 { 160 gcc_assert (!validated_p); 161 return false; 162 } 163 164 *value = TREE_INT_CST_LOW (expr); 165 166 return true; 167} 168 169/* Decode the arguments to a "format" attribute into a 170 function_format_info structure. It is already known that the list 171 is of the right length. If VALIDATED_P is true, then these 172 attributes have already been validated and must not be erroneous; 173 if false, it will give an error message. Returns true if the 174 attributes are successfully decoded, false otherwise. */ 175 176static bool 177decode_format_attr (tree args, function_format_info *info, int validated_p) 178{ 179 tree format_type_id = TREE_VALUE (args); 180 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args)); 181 tree first_arg_num_expr 182 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args))); 183 184 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE) 185 { 186 gcc_assert (!validated_p); 187 error ("unrecognized format specifier"); 188 return false; 189 } 190 else 191 { 192 const char *p = IDENTIFIER_POINTER (format_type_id); 193 194 p = convert_format_name_to_system_name (p); 195 196 info->format_type = decode_format_type (p); 197 198 if (info->format_type == format_type_error) 199 { 200 gcc_assert (!validated_p); 201 warning (OPT_Wformat, "%qE is an unrecognized format function type", 202 format_type_id); 203 return false; 204 } 205 } 206 207 if (!get_constant (format_num_expr, &info->format_num, validated_p)) 208 { 209 error ("format string has invalid operand number"); 210 return false; 211 } 212 213 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p)) 214 { 215 error ("%<...%> has invalid operand number"); 216 return false; 217 } 218 219 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num) 220 { 221 gcc_assert (!validated_p); 222 error ("format string argument follows the args to be formatted"); 223 return false; 224 } 225 226 return true; 227} 228 229/* Check a call to a format function against a parameter list. */ 230 231/* The C standard version C++ is treated as equivalent to 232 or inheriting from, for the purpose of format features supported. */ 233#define CPLUSPLUS_STD_VER STD_C94 234/* The C standard version we are checking formats against when pedantic. */ 235#define C_STD_VER ((int) (c_dialect_cxx () \ 236 ? CPLUSPLUS_STD_VER \ 237 : (flag_isoc99 \ 238 ? STD_C99 \ 239 : (flag_isoc94 ? STD_C94 : STD_C89)))) 240/* The name to give to the standard version we are warning about when 241 pedantic. FEATURE_VER is the version in which the feature warned out 242 appeared, which is higher than C_STD_VER. */ 243#define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \ 244 ? "ISO C++" \ 245 : ((FEATURE_VER) == STD_EXT \ 246 ? "ISO C" \ 247 : "ISO C90")) 248/* Adjust a C standard version, which may be STD_C9L, to account for 249 -Wno-long-long. Returns other standard versions unchanged. */ 250#define ADJ_STD(VER) ((int) ((VER) == STD_C9L \ 251 ? (warn_long_long ? STD_C99 : STD_C89) \ 252 : (VER))) 253 254/* Structure describing details of a type expected in format checking, 255 and the type to check against it. */ 256typedef struct format_wanted_type 257{ 258 /* The type wanted. */ 259 tree wanted_type; 260 /* The name of this type to use in diagnostics. */ 261 const char *wanted_type_name; 262 /* Should be type checked just for scalar width identity. */ 263 int scalar_identity_flag; 264 /* The level of indirection through pointers at which this type occurs. */ 265 int pointer_count; 266 /* Whether, when pointer_count is 1, to allow any character type when 267 pedantic, rather than just the character or void type specified. */ 268 int char_lenient_flag; 269 /* Whether the argument, dereferenced once, is written into and so the 270 argument must not be a pointer to a const-qualified type. */ 271 int writing_in_flag; 272 /* Whether the argument, dereferenced once, is read from and so 273 must not be a NULL pointer. */ 274 int reading_from_flag; 275 /* If warnings should be of the form "field precision should have 276 type 'int'", the name to use (in this case "field precision"), 277 otherwise NULL, for "format expects type 'long'" type 278 messages. */ 279 const char *name; 280 /* The actual parameter to check against the wanted type. */ 281 tree param; 282 /* The argument number of that parameter. */ 283 int arg_num; 284 /* The next type to check for this format conversion, or NULL if none. */ 285 struct format_wanted_type *next; 286} format_wanted_type; 287 288/* Convenience macro for format_length_info meaning unused. */ 289#define NO_FMT NULL, FMT_LEN_none, STD_C89 290 291static const format_length_info printf_length_specs[] = 292{ 293 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 }, 294 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 }, 295 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 }, 296 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 }, 297 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 }, 298 { "Z", FMT_LEN_z, STD_EXT, NO_FMT, 0 }, 299 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 }, 300 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 }, 301 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 }, 302 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 }, 303 { NO_FMT, NO_FMT, 0 } 304}; 305 306/* Length specifiers valid for asm_fprintf. */ 307static const format_length_info asm_fprintf_length_specs[] = 308{ 309 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 }, 310 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 }, 311 { NO_FMT, NO_FMT, 0 } 312}; 313 314/* Length specifiers valid for GCC diagnostics. */ 315static const format_length_info gcc_diag_length_specs[] = 316{ 317 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89, 0 }, 318 { "w", FMT_LEN_none, STD_C89, NO_FMT, 0 }, 319 { NO_FMT, NO_FMT, 0 } 320}; 321 322/* The custom diagnostics all accept the same length specifiers. */ 323#define gcc_tdiag_length_specs gcc_diag_length_specs 324#define gcc_cdiag_length_specs gcc_diag_length_specs 325#define gcc_cxxdiag_length_specs gcc_diag_length_specs 326 327/* This differs from printf_length_specs only in that "Z" is not accepted. */ 328static const format_length_info scanf_length_specs[] = 329{ 330 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99, 0 }, 331 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L, 0 }, 332 { "q", FMT_LEN_ll, STD_EXT, NO_FMT, 0 }, 333 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 }, 334 { "z", FMT_LEN_z, STD_C99, NO_FMT, 0 }, 335 { "t", FMT_LEN_t, STD_C99, NO_FMT, 0 }, 336 { "j", FMT_LEN_j, STD_C99, NO_FMT, 0 }, 337 { "H", FMT_LEN_H, STD_EXT, NO_FMT, 0 }, 338 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT, 0 }, 339 { NO_FMT, NO_FMT, 0 } 340}; 341 342 343/* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings 344 make no sense for a format type not part of any C standard version. */ 345static const format_length_info strfmon_length_specs[] = 346{ 347 /* A GNU extension. */ 348 { "L", FMT_LEN_L, STD_C89, NO_FMT, 0 }, 349 { NO_FMT, NO_FMT, 0 } 350}; 351 352 353/* For now, the Fortran front-end routines only use l as length modifier. */ 354static const format_length_info gcc_gfc_length_specs[] = 355{ 356 { "l", FMT_LEN_l, STD_C89, NO_FMT, 0 }, 357 { NO_FMT, NO_FMT, 0 } 358}; 359 360 361static const format_flag_spec printf_flag_specs[] = 362{ 363 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 }, 364 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 365 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 366 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 }, 367 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 }, 368 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT }, 369 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT }, 370 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 }, 371 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 372 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 373 { 0, 0, 0, NULL, NULL, STD_C89 } 374}; 375 376 377static const format_flag_pair printf_flag_pairs[] = 378{ 379 { ' ', '+', 1, 0 }, 380 { '0', '-', 1, 0 }, 381 { '0', 'p', 1, 'i' }, 382 { 0, 0, 0, 0 } 383}; 384 385static const format_flag_spec asm_fprintf_flag_specs[] = 386{ 387 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 }, 388 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 389 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 390 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 }, 391 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 }, 392 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 }, 393 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 394 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 395 { 0, 0, 0, NULL, NULL, STD_C89 } 396}; 397 398static const format_flag_pair asm_fprintf_flag_pairs[] = 399{ 400 { ' ', '+', 1, 0 }, 401 { '0', '-', 1, 0 }, 402 { '0', 'p', 1, 'i' }, 403 { 0, 0, 0, 0 } 404}; 405 406static const format_flag_pair gcc_diag_flag_pairs[] = 407{ 408 { 0, 0, 0, 0 } 409}; 410 411#define gcc_tdiag_flag_pairs gcc_diag_flag_pairs 412#define gcc_cdiag_flag_pairs gcc_diag_flag_pairs 413#define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs 414 415static const format_flag_pair gcc_gfc_flag_pairs[] = 416{ 417 { 0, 0, 0, 0 } 418}; 419 420static const format_flag_spec gcc_diag_flag_specs[] = 421{ 422 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 423 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 }, 424 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 425 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 426 { 0, 0, 0, NULL, NULL, STD_C89 } 427}; 428 429#define gcc_tdiag_flag_specs gcc_diag_flag_specs 430#define gcc_cdiag_flag_specs gcc_diag_flag_specs 431 432static const format_flag_spec gcc_cxxdiag_flag_specs[] = 433{ 434 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 435 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 436 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 }, 437 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 438 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 439 { 0, 0, 0, NULL, NULL, STD_C89 } 440}; 441 442static const format_flag_spec scanf_flag_specs[] = 443{ 444 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 }, 445 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT }, 446 { 'm', 0, 0, N_("'m' flag"), N_("the 'm' scanf flag"), STD_EXT }, 447 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 }, 448 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 }, 449 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT }, 450 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT }, 451 { 0, 0, 0, NULL, NULL, STD_C89 } 452}; 453 454 455static const format_flag_pair scanf_flag_pairs[] = 456{ 457 { '*', 'L', 0, 0 }, 458 { 'a', 'm', 0, 0 }, 459 { 0, 0, 0, 0 } 460}; 461 462 463static const format_flag_spec strftime_flag_specs[] = 464{ 465 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT }, 466 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT }, 467 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT }, 468 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT }, 469 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT }, 470 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT }, 471 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 }, 472 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 }, 473 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT }, 474 { 0, 0, 0, NULL, NULL, STD_C89 } 475}; 476 477 478static const format_flag_pair strftime_flag_pairs[] = 479{ 480 { 'E', 'O', 0, 0 }, 481 { '_', '-', 0, 0 }, 482 { '_', '0', 0, 0 }, 483 { '-', '0', 0, 0 }, 484 { '^', '#', 0, 0 }, 485 { 0, 0, 0, 0 } 486}; 487 488 489static const format_flag_spec strfmon_flag_specs[] = 490{ 491 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 }, 492 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 }, 493 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 }, 494 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 }, 495 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 }, 496 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 }, 497 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 }, 498 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 }, 499 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 }, 500 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 }, 501 { 0, 0, 0, NULL, NULL, STD_C89 } 502}; 503 504static const format_flag_pair strfmon_flag_pairs[] = 505{ 506 { '+', '(', 0, 0 }, 507 { 0, 0, 0, 0 } 508}; 509 510 511static const format_char_info print_char_table[] = 512{ 513 /* C89 conversion specifiers. */ 514 { "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 }, 515 { "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 }, 516 { "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 }, 517 { "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 }, 518 { "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 }, 519 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 520 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL }, 521 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL }, 522 { "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 }, 523 /* C99 conversion specifiers. */ 524 { "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 }, 525 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL }, 526 /* X/Open conversion specifiers. */ 527 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 528 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL }, 529 /* GNU conversion specifiers. */ 530 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL }, 531 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 532}; 533 534static const format_char_info asm_fprintf_char_table[] = 535{ 536 /* C89 conversion specifiers. */ 537 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL }, 538 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL }, 539 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL }, 540 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 541 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL }, 542 543 /* asm_fprintf conversion specifiers. */ 544 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 545 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 546 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 547 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 548 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 549 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 550 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 551 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 552}; 553 554static const format_char_info gcc_diag_char_table[] = 555{ 556 /* C89 conversion specifiers. */ 557 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 558 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 559 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 560 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 561 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 562 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 563 564 /* Custom conversion specifiers. */ 565 566 /* These will require a "tree" at runtime. */ 567 { "K", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 568 569 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 570 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 571 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 572}; 573 574static const format_char_info gcc_tdiag_char_table[] = 575{ 576 /* C89 conversion specifiers. */ 577 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 578 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 579 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 580 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 581 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 582 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 583 584 /* Custom conversion specifiers. */ 585 586 /* These will require a "tree" at runtime. */ 587 { "DFKTE", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 588 589 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 590 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 591 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 592}; 593 594static const format_char_info gcc_cdiag_char_table[] = 595{ 596 /* C89 conversion specifiers. */ 597 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 598 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 599 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 600 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 601 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 602 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 603 604 /* Custom conversion specifiers. */ 605 606 /* These will require a "tree" at runtime. */ 607 { "DEFKT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 608 609 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 610 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 611 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 612}; 613 614static const format_char_info gcc_cxxdiag_char_table[] = 615{ 616 /* C89 conversion specifiers. */ 617 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 618 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 619 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 620 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 621 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 622 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 623 624 /* Custom conversion specifiers. */ 625 626 /* These will require a "tree" at runtime. */ 627 { "ADEFKTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL }, 628 629 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */ 630 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 631 632 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 633 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 634 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 635}; 636 637static const format_char_info gcc_gfc_char_table[] = 638{ 639 /* C89 conversion specifiers. */ 640 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 641 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 642 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 643 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL }, 644 645 /* gfc conversion specifiers. */ 646 647 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 648 649 /* This will require a "locus" at runtime. */ 650 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL }, 651 652 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 653}; 654 655static const format_char_info scan_char_table[] = 656{ 657 /* C89 conversion specifiers. */ 658 { "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 }, 659 { "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 }, 660 { "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 }, 661 { "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 }, 662 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "cW", NULL }, 663 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW", NULL }, 664 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "cW[", NULL }, 665 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL }, 666 { "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 }, 667 /* C99 conversion specifiers. */ 668 { "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 }, 669 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL }, 670 /* X/Open conversion specifiers. */ 671 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*mw", "W", NULL }, 672 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*amw", "W", NULL }, 673 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 674}; 675 676static const format_char_info time_char_table[] = 677{ 678 /* C89 conversion specifiers. */ 679 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL }, 680 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL }, 681 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL }, 682 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL }, 683 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL }, 684 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL }, 685 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL }, 686 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL }, 687 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL }, 688 /* C99 conversion specifiers. */ 689 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL }, 690 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL }, 691 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL }, 692 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL }, 693 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL }, 694 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL }, 695 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL }, 696 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL }, 697 /* GNU conversion specifiers. */ 698 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL }, 699 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL }, 700 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 701}; 702 703static const format_char_info monetary_char_table[] = 704{ 705 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL }, 706 { NULL, 0, STD_C89, NOLENGTHS, NULL, NULL, NULL } 707}; 708 709/* This must be in the same order as enum format_type. */ 710static const format_kind_info format_types_orig[] = 711{ 712 { "gnu_printf", printf_length_specs, print_char_table, " +#0-'I", NULL, 713 printf_flag_specs, printf_flag_pairs, 714 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK, 715 'w', 0, 'p', 0, 'L', 0, 716 &integer_type_node, &integer_type_node 717 }, 718 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL, 719 asm_fprintf_flag_specs, asm_fprintf_flag_pairs, 720 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK, 721 'w', 0, 'p', 0, 'L', 0, 722 NULL, NULL 723 }, 724 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL, 725 gcc_diag_flag_specs, gcc_diag_flag_pairs, 726 FMT_FLAG_ARG_CONVERT, 727 0, 0, 'p', 0, 'L', 0, 728 NULL, &integer_type_node 729 }, 730 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL, 731 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs, 732 FMT_FLAG_ARG_CONVERT, 733 0, 0, 'p', 0, 'L', 0, 734 NULL, &integer_type_node 735 }, 736 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL, 737 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs, 738 FMT_FLAG_ARG_CONVERT, 739 0, 0, 'p', 0, 'L', 0, 740 NULL, &integer_type_node 741 }, 742 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL, 743 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs, 744 FMT_FLAG_ARG_CONVERT, 745 0, 0, 'p', 0, 'L', 0, 746 NULL, &integer_type_node 747 }, 748 { "gcc_gfc", gcc_gfc_length_specs, gcc_gfc_char_table, "", NULL, 749 NULL, gcc_gfc_flag_pairs, 750 FMT_FLAG_ARG_CONVERT, 751 0, 0, 0, 0, 0, 0, 752 NULL, NULL 753 }, 754 { "gnu_scanf", scanf_length_specs, scan_char_table, "*'I", NULL, 755 scanf_flag_specs, scanf_flag_pairs, 756 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK, 757 'w', 0, 0, '*', 'L', 'm', 758 NULL, NULL 759 }, 760 { "gnu_strftime", NULL, time_char_table, "_-0^#", "EO", 761 strftime_flag_specs, strftime_flag_pairs, 762 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 0, 763 NULL, NULL 764 }, 765 { "gnu_strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL, 766 strfmon_flag_specs, strfmon_flag_pairs, 767 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 0, 768 NULL, NULL 769 } 770}; 771 772/* This layer of indirection allows GCC to reassign format_types with 773 new data if necessary, while still allowing the original data to be 774 const. */ 775static const format_kind_info *format_types = format_types_orig; 776/* We can modify this one. We also add target-specific format types 777 to the end of the array. */ 778static format_kind_info *dynamic_format_types; 779 780static int n_format_types = ARRAY_SIZE (format_types_orig); 781 782/* Structure detailing the results of checking a format function call 783 where the format expression may be a conditional expression with 784 many leaves resulting from nested conditional expressions. */ 785typedef struct 786{ 787 /* Number of leaves of the format argument that could not be checked 788 as they were not string literals. */ 789 int number_non_literal; 790 /* Number of leaves of the format argument that were null pointers or 791 string literals, but had extra format arguments. */ 792 int number_extra_args; 793 /* Number of leaves of the format argument that were null pointers or 794 string literals, but had extra format arguments and used $ operand 795 numbers. */ 796 int number_dollar_extra_args; 797 /* Number of leaves of the format argument that were wide string 798 literals. */ 799 int number_wide; 800 /* Number of leaves of the format argument that were empty strings. */ 801 int number_empty; 802 /* Number of leaves of the format argument that were unterminated 803 strings. */ 804 int number_unterminated; 805 /* Number of leaves of the format argument that were not counted above. */ 806 int number_other; 807} format_check_results; 808 809typedef struct 810{ 811 format_check_results *res; 812 function_format_info *info; 813 tree params; 814} format_check_context; 815 816static void check_format_info (function_format_info *, tree); 817static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT); 818static void check_format_info_main (format_check_results *, 819 function_format_info *, 820 const char *, int, tree, 821 unsigned HOST_WIDE_INT, alloc_pool); 822 823static void init_dollar_format_checking (int, tree); 824static int maybe_read_dollar_number (const char **, int, 825 tree, tree *, const format_kind_info *); 826static bool avoid_dollar_number (const char *); 827static void finish_dollar_format_checking (format_check_results *, int); 828 829static const format_flag_spec *get_flag_spec (const format_flag_spec *, 830 int, const char *); 831 832static void check_format_types (format_wanted_type *, const char *, int); 833static void format_type_warning (const char *, const char *, int, tree, 834 int, const char *, tree, int); 835 836/* Decode a format type from a string, returning the type, or 837 format_type_error if not valid, in which case the caller should print an 838 error message. */ 839static int 840decode_format_type (const char *s) 841{ 842 int i; 843 int slen; 844 845 s = convert_format_name_to_system_name (s); 846 slen = strlen (s); 847 for (i = 0; i < n_format_types; i++) 848 { 849 int alen; 850 if (!strcmp (s, format_types[i].name)) 851 return i; 852 alen = strlen (format_types[i].name); 853 if (slen == alen + 4 && s[0] == '_' && s[1] == '_' 854 && s[slen - 1] == '_' && s[slen - 2] == '_' 855 && !strncmp (s + 2, format_types[i].name, alen)) 856 return i; 857 } 858 return format_type_error; 859} 860 861 862/* Check the argument list of a call to printf, scanf, etc. 863 ATTRS are the attributes on the function type. There are NARGS argument 864 values in the array ARGARRAY. 865 Also, if -Wmissing-format-attribute, 866 warn for calls to vprintf or vscanf in functions with no such format 867 attribute themselves. */ 868 869void 870check_function_format (tree attrs, int nargs, tree *argarray) 871{ 872 tree a; 873 874 /* See if this function has any format attributes. */ 875 for (a = attrs; a; a = TREE_CHAIN (a)) 876 { 877 if (is_attribute_p ("format", TREE_PURPOSE (a))) 878 { 879 /* Yup; check it. */ 880 function_format_info info; 881 decode_format_attr (TREE_VALUE (a), &info, 1); 882 if (warn_format) 883 { 884 /* FIXME: Rewrite all the internal functions in this file 885 to use the ARGARRAY directly instead of constructing this 886 temporary list. */ 887 tree params = NULL_TREE; 888 int i; 889 for (i = nargs - 1; i >= 0; i--) 890 params = tree_cons (NULL_TREE, argarray[i], params); 891 check_format_info (&info, params); 892 } 893 if (warn_missing_format_attribute && info.first_arg_num == 0 894 && (format_types[info.format_type].flags 895 & (int) FMT_FLAG_ARG_CONVERT)) 896 { 897 tree c; 898 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl)); 899 c; 900 c = TREE_CHAIN (c)) 901 if (is_attribute_p ("format", TREE_PURPOSE (c)) 902 && (decode_format_type (IDENTIFIER_POINTER 903 (TREE_VALUE (TREE_VALUE (c)))) 904 == info.format_type)) 905 break; 906 if (c == NULL_TREE) 907 { 908 /* Check if the current function has a parameter to which 909 the format attribute could be attached; if not, it 910 can't be a candidate for a format attribute, despite 911 the vprintf-like or vscanf-like call. */ 912 tree args; 913 for (args = DECL_ARGUMENTS (current_function_decl); 914 args != 0; 915 args = TREE_CHAIN (args)) 916 { 917 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE 918 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args))) 919 == char_type_node)) 920 break; 921 } 922 if (args != 0) 923 warning (OPT_Wmissing_format_attribute, "function might " 924 "be possible candidate for %qs format attribute", 925 format_types[info.format_type].name); 926 } 927 } 928 } 929 } 930} 931 932 933/* Variables used by the checking of $ operand number formats. */ 934static char *dollar_arguments_used = NULL; 935static char *dollar_arguments_pointer_p = NULL; 936static int dollar_arguments_alloc = 0; 937static int dollar_arguments_count; 938static int dollar_first_arg_num; 939static int dollar_max_arg_used; 940static int dollar_format_warned; 941 942/* Initialize the checking for a format string that may contain $ 943 parameter number specifications; we will need to keep track of whether 944 each parameter has been used. FIRST_ARG_NUM is the number of the first 945 argument that is a parameter to the format, or 0 for a vprintf-style 946 function; PARAMS is the list of arguments starting at this argument. */ 947 948static void 949init_dollar_format_checking (int first_arg_num, tree params) 950{ 951 tree oparams = params; 952 953 dollar_first_arg_num = first_arg_num; 954 dollar_arguments_count = 0; 955 dollar_max_arg_used = 0; 956 dollar_format_warned = 0; 957 if (first_arg_num > 0) 958 { 959 while (params) 960 { 961 dollar_arguments_count++; 962 params = TREE_CHAIN (params); 963 } 964 } 965 if (dollar_arguments_alloc < dollar_arguments_count) 966 { 967 if (dollar_arguments_used) 968 free (dollar_arguments_used); 969 if (dollar_arguments_pointer_p) 970 free (dollar_arguments_pointer_p); 971 dollar_arguments_alloc = dollar_arguments_count; 972 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc); 973 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc); 974 } 975 if (dollar_arguments_alloc) 976 { 977 memset (dollar_arguments_used, 0, dollar_arguments_alloc); 978 if (first_arg_num > 0) 979 { 980 int i = 0; 981 params = oparams; 982 while (params) 983 { 984 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params))) 985 == POINTER_TYPE); 986 params = TREE_CHAIN (params); 987 i++; 988 } 989 } 990 } 991} 992 993 994/* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED 995 is set, it is an error if one is not found; otherwise, it is OK. If 996 such a number is found, check whether it is within range and mark that 997 numbered operand as being used for later checking. Returns the operand 998 number if found and within range, zero if no such number was found and 999 this is OK, or -1 on error. PARAMS points to the first operand of the 1000 format; PARAM_PTR is made to point to the parameter referred to. If 1001 a $ format is found, *FORMAT is updated to point just after it. */ 1002 1003static int 1004maybe_read_dollar_number (const char **format, 1005 int dollar_needed, tree params, tree *param_ptr, 1006 const format_kind_info *fki) 1007{ 1008 int argnum; 1009 int overflow_flag; 1010 const char *fcp = *format; 1011 if (!ISDIGIT (*fcp)) 1012 { 1013 if (dollar_needed) 1014 { 1015 warning (OPT_Wformat, "missing $ operand number in format"); 1016 return -1; 1017 } 1018 else 1019 return 0; 1020 } 1021 argnum = 0; 1022 overflow_flag = 0; 1023 while (ISDIGIT (*fcp)) 1024 { 1025 int nargnum; 1026 nargnum = 10 * argnum + (*fcp - '0'); 1027 if (nargnum < 0 || nargnum / 10 != argnum) 1028 overflow_flag = 1; 1029 argnum = nargnum; 1030 fcp++; 1031 } 1032 if (*fcp != '$') 1033 { 1034 if (dollar_needed) 1035 { 1036 warning (OPT_Wformat, "missing $ operand number in format"); 1037 return -1; 1038 } 1039 else 1040 return 0; 1041 } 1042 *format = fcp + 1; 1043 if (pedantic && !dollar_format_warned) 1044 { 1045 warning (OPT_Wformat, "%s does not support %%n$ operand number formats", 1046 C_STD_NAME (STD_EXT)); 1047 dollar_format_warned = 1; 1048 } 1049 if (overflow_flag || argnum == 0 1050 || (dollar_first_arg_num && argnum > dollar_arguments_count)) 1051 { 1052 warning (OPT_Wformat, "operand number out of range in format"); 1053 return -1; 1054 } 1055 if (argnum > dollar_max_arg_used) 1056 dollar_max_arg_used = argnum; 1057 /* For vprintf-style functions we may need to allocate more memory to 1058 track which arguments are used. */ 1059 while (dollar_arguments_alloc < dollar_max_arg_used) 1060 { 1061 int nalloc; 1062 nalloc = 2 * dollar_arguments_alloc + 16; 1063 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used, 1064 nalloc); 1065 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p, 1066 nalloc); 1067 memset (dollar_arguments_used + dollar_arguments_alloc, 0, 1068 nalloc - dollar_arguments_alloc); 1069 dollar_arguments_alloc = nalloc; 1070 } 1071 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE) 1072 && dollar_arguments_used[argnum - 1] == 1) 1073 { 1074 dollar_arguments_used[argnum - 1] = 2; 1075 warning (OPT_Wformat, "format argument %d used more than once in %s format", 1076 argnum, fki->name); 1077 } 1078 else 1079 dollar_arguments_used[argnum - 1] = 1; 1080 if (dollar_first_arg_num) 1081 { 1082 int i; 1083 *param_ptr = params; 1084 for (i = 1; i < argnum && *param_ptr != 0; i++) 1085 *param_ptr = TREE_CHAIN (*param_ptr); 1086 1087 /* This case shouldn't be caught here. */ 1088 gcc_assert (*param_ptr); 1089 } 1090 else 1091 *param_ptr = 0; 1092 return argnum; 1093} 1094 1095/* Ensure that FORMAT does not start with a decimal number followed by 1096 a $; give a diagnostic and return true if it does, false otherwise. */ 1097 1098static bool 1099avoid_dollar_number (const char *format) 1100{ 1101 if (!ISDIGIT (*format)) 1102 return false; 1103 while (ISDIGIT (*format)) 1104 format++; 1105 if (*format == '$') 1106 { 1107 warning (OPT_Wformat, "$ operand number used after format without operand number"); 1108 return true; 1109 } 1110 return false; 1111} 1112 1113 1114/* Finish the checking for a format string that used $ operand number formats 1115 instead of non-$ formats. We check for unused operands before used ones 1116 (a serious error, since the implementation of the format function 1117 can't know what types to pass to va_arg to find the later arguments). 1118 and for unused operands at the end of the format (if we know how many 1119 arguments the format had, so not for vprintf). If there were operand 1120 numbers out of range on a non-vprintf-style format, we won't have reached 1121 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are 1122 pointers. */ 1123 1124static void 1125finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok) 1126{ 1127 int i; 1128 bool found_pointer_gap = false; 1129 for (i = 0; i < dollar_max_arg_used; i++) 1130 { 1131 if (!dollar_arguments_used[i]) 1132 { 1133 if (pointer_gap_ok && (dollar_first_arg_num == 0 1134 || dollar_arguments_pointer_p[i])) 1135 found_pointer_gap = true; 1136 else 1137 warning (OPT_Wformat, 1138 "format argument %d unused before used argument %d in $-style format", 1139 i + 1, dollar_max_arg_used); 1140 } 1141 } 1142 if (found_pointer_gap 1143 || (dollar_first_arg_num 1144 && dollar_max_arg_used < dollar_arguments_count)) 1145 { 1146 res->number_other--; 1147 res->number_dollar_extra_args++; 1148 } 1149} 1150 1151 1152/* Retrieve the specification for a format flag. SPEC contains the 1153 specifications for format flags for the applicable kind of format. 1154 FLAG is the flag in question. If PREDICATES is NULL, the basic 1155 spec for that flag must be retrieved and must exist. If 1156 PREDICATES is not NULL, it is a string listing possible predicates 1157 for the spec entry; if an entry predicated on any of these is 1158 found, it is returned, otherwise NULL is returned. */ 1159 1160static const format_flag_spec * 1161get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates) 1162{ 1163 int i; 1164 for (i = 0; spec[i].flag_char != 0; i++) 1165 { 1166 if (spec[i].flag_char != flag) 1167 continue; 1168 if (predicates != NULL) 1169 { 1170 if (spec[i].predicate != 0 1171 && strchr (predicates, spec[i].predicate) != 0) 1172 return &spec[i]; 1173 } 1174 else if (spec[i].predicate == 0) 1175 return &spec[i]; 1176 } 1177 gcc_assert (predicates); 1178 return NULL; 1179} 1180 1181 1182/* Check the argument list of a call to printf, scanf, etc. 1183 INFO points to the function_format_info structure. 1184 PARAMS is the list of argument values. */ 1185 1186static void 1187check_format_info (function_format_info *info, tree params) 1188{ 1189 format_check_context format_ctx; 1190 unsigned HOST_WIDE_INT arg_num; 1191 tree format_tree; 1192 format_check_results res; 1193 /* Skip to format argument. If the argument isn't available, there's 1194 no work for us to do; prototype checking will catch the problem. */ 1195 for (arg_num = 1; ; ++arg_num) 1196 { 1197 if (params == 0) 1198 return; 1199 if (arg_num == info->format_num) 1200 break; 1201 params = TREE_CHAIN (params); 1202 } 1203 format_tree = TREE_VALUE (params); 1204 params = TREE_CHAIN (params); 1205 if (format_tree == 0) 1206 return; 1207 1208 res.number_non_literal = 0; 1209 res.number_extra_args = 0; 1210 res.number_dollar_extra_args = 0; 1211 res.number_wide = 0; 1212 res.number_empty = 0; 1213 res.number_unterminated = 0; 1214 res.number_other = 0; 1215 1216 format_ctx.res = &res; 1217 format_ctx.info = info; 1218 format_ctx.params = params; 1219 1220 check_function_arguments_recurse (check_format_arg, &format_ctx, 1221 format_tree, arg_num); 1222 1223 if (res.number_non_literal > 0) 1224 { 1225 /* Functions taking a va_list normally pass a non-literal format 1226 string. These functions typically are declared with 1227 first_arg_num == 0, so avoid warning in those cases. */ 1228 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT)) 1229 { 1230 /* For strftime-like formats, warn for not checking the format 1231 string; but there are no arguments to check. */ 1232 warning (OPT_Wformat_nonliteral, 1233 "format not a string literal, format string not checked"); 1234 } 1235 else if (info->first_arg_num != 0) 1236 { 1237 /* If there are no arguments for the format at all, we may have 1238 printf (foo) which is likely to be a security hole. */ 1239 while (arg_num + 1 < info->first_arg_num) 1240 { 1241 if (params == 0) 1242 break; 1243 params = TREE_CHAIN (params); 1244 ++arg_num; 1245 } 1246 if (params == 0 && warn_format_security) 1247 warning (OPT_Wformat_security, 1248 "format not a string literal and no format arguments"); 1249 else if (params == 0 && warn_format_nonliteral) 1250 warning (OPT_Wformat_nonliteral, 1251 "format not a string literal and no format arguments"); 1252 else 1253 warning (OPT_Wformat_nonliteral, 1254 "format not a string literal, argument types not checked"); 1255 } 1256 } 1257 1258 /* If there were extra arguments to the format, normally warn. However, 1259 the standard does say extra arguments are ignored, so in the specific 1260 case where we have multiple leaves (conditional expressions or 1261 ngettext) allow extra arguments if at least one leaf didn't have extra 1262 arguments, but was otherwise OK (either non-literal or checked OK). 1263 If the format is an empty string, this should be counted similarly to the 1264 case of extra format arguments. */ 1265 if (res.number_extra_args > 0 && res.number_non_literal == 0 1266 && res.number_other == 0) 1267 warning (OPT_Wformat_extra_args, "too many arguments for format"); 1268 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0 1269 && res.number_other == 0) 1270 warning (OPT_Wformat_extra_args, "unused arguments in $-style format"); 1271 if (res.number_empty > 0 && res.number_non_literal == 0 1272 && res.number_other == 0) 1273 warning (OPT_Wformat_zero_length, "zero-length %s format string", 1274 format_types[info->format_type].name); 1275 1276 if (res.number_wide > 0) 1277 warning (OPT_Wformat, "format is a wide character string"); 1278 1279 if (res.number_unterminated > 0) 1280 warning (OPT_Wformat, "unterminated format string"); 1281} 1282 1283/* Callback from check_function_arguments_recurse to check a 1284 format string. FORMAT_TREE is the format parameter. ARG_NUM 1285 is the number of the format argument. CTX points to a 1286 format_check_context. */ 1287 1288static void 1289check_format_arg (void *ctx, tree format_tree, 1290 unsigned HOST_WIDE_INT arg_num) 1291{ 1292 format_check_context *format_ctx = (format_check_context *) ctx; 1293 format_check_results *res = format_ctx->res; 1294 function_format_info *info = format_ctx->info; 1295 tree params = format_ctx->params; 1296 1297 int format_length; 1298 HOST_WIDE_INT offset; 1299 const char *format_chars; 1300 tree array_size = 0; 1301 tree array_init; 1302 alloc_pool fwt_pool; 1303 1304 if (integer_zerop (format_tree)) 1305 { 1306 /* Skip to first argument to check, so we can see if this format 1307 has any arguments (it shouldn't). */ 1308 while (arg_num + 1 < info->first_arg_num) 1309 { 1310 if (params == 0) 1311 return; 1312 params = TREE_CHAIN (params); 1313 ++arg_num; 1314 } 1315 1316 if (params == 0) 1317 res->number_other++; 1318 else 1319 res->number_extra_args++; 1320 1321 return; 1322 } 1323 1324 offset = 0; 1325 if (TREE_CODE (format_tree) == POINTER_PLUS_EXPR) 1326 { 1327 tree arg0, arg1; 1328 1329 arg0 = TREE_OPERAND (format_tree, 0); 1330 arg1 = TREE_OPERAND (format_tree, 1); 1331 STRIP_NOPS (arg0); 1332 STRIP_NOPS (arg1); 1333 if (TREE_CODE (arg1) == INTEGER_CST) 1334 format_tree = arg0; 1335 else 1336 { 1337 res->number_non_literal++; 1338 return; 1339 } 1340 if (!host_integerp (arg1, 0) 1341 || (offset = tree_low_cst (arg1, 0)) < 0) 1342 { 1343 res->number_non_literal++; 1344 return; 1345 } 1346 } 1347 if (TREE_CODE (format_tree) != ADDR_EXPR) 1348 { 1349 res->number_non_literal++; 1350 return; 1351 } 1352 format_tree = TREE_OPERAND (format_tree, 0); 1353 if (TREE_CODE (format_tree) == ARRAY_REF 1354 && host_integerp (TREE_OPERAND (format_tree, 1), 0) 1355 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0) 1356 format_tree = TREE_OPERAND (format_tree, 0); 1357 if (TREE_CODE (format_tree) == VAR_DECL 1358 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE 1359 && (array_init = decl_constant_value (format_tree)) != format_tree 1360 && TREE_CODE (array_init) == STRING_CST) 1361 { 1362 /* Extract the string constant initializer. Note that this may include 1363 a trailing NUL character that is not in the array (e.g. 1364 const char a[3] = "foo";). */ 1365 array_size = DECL_SIZE_UNIT (format_tree); 1366 format_tree = array_init; 1367 } 1368 if (TREE_CODE (format_tree) != STRING_CST) 1369 { 1370 res->number_non_literal++; 1371 return; 1372 } 1373 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node) 1374 { 1375 res->number_wide++; 1376 return; 1377 } 1378 format_chars = TREE_STRING_POINTER (format_tree); 1379 format_length = TREE_STRING_LENGTH (format_tree); 1380 if (array_size != 0) 1381 { 1382 /* Variable length arrays can't be initialized. */ 1383 gcc_assert (TREE_CODE (array_size) == INTEGER_CST); 1384 1385 if (host_integerp (array_size, 0)) 1386 { 1387 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size); 1388 if (array_size_value > 0 1389 && array_size_value == (int) array_size_value 1390 && format_length > array_size_value) 1391 format_length = array_size_value; 1392 } 1393 } 1394 if (offset) 1395 { 1396 if (offset >= format_length) 1397 { 1398 res->number_non_literal++; 1399 return; 1400 } 1401 format_chars += offset; 1402 format_length -= offset; 1403 } 1404 if (format_length < 1 || format_chars[--format_length] != 0) 1405 { 1406 res->number_unterminated++; 1407 return; 1408 } 1409 if (format_length == 0) 1410 { 1411 res->number_empty++; 1412 return; 1413 } 1414 1415 /* Skip to first argument to check. */ 1416 while (arg_num + 1 < info->first_arg_num) 1417 { 1418 if (params == 0) 1419 return; 1420 params = TREE_CHAIN (params); 1421 ++arg_num; 1422 } 1423 /* Provisionally increment res->number_other; check_format_info_main 1424 will decrement it if it finds there are extra arguments, but this way 1425 need not adjust it for every return. */ 1426 res->number_other++; 1427 fwt_pool = create_alloc_pool ("format_wanted_type pool", 1428 sizeof (format_wanted_type), 10); 1429 check_format_info_main (res, info, format_chars, format_length, 1430 params, arg_num, fwt_pool); 1431 free_alloc_pool (fwt_pool); 1432} 1433 1434 1435/* Do the main part of checking a call to a format function. FORMAT_CHARS 1436 is the NUL-terminated format string (which at this point may contain 1437 internal NUL characters); FORMAT_LENGTH is its length (excluding the 1438 terminating NUL character). ARG_NUM is one less than the number of 1439 the first format argument to check; PARAMS points to that format 1440 argument in the list of arguments. */ 1441 1442static void 1443check_format_info_main (format_check_results *res, 1444 function_format_info *info, const char *format_chars, 1445 int format_length, tree params, 1446 unsigned HOST_WIDE_INT arg_num, alloc_pool fwt_pool) 1447{ 1448 const char *orig_format_chars = format_chars; 1449 tree first_fillin_param = params; 1450 1451 const format_kind_info *fki = &format_types[info->format_type]; 1452 const format_flag_spec *flag_specs = fki->flag_specs; 1453 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs; 1454 1455 /* -1 if no conversions taking an operand have been found; 0 if one has 1456 and it didn't use $; 1 if $ formats are in use. */ 1457 int has_operand_number = -1; 1458 1459 init_dollar_format_checking (info->first_arg_num, first_fillin_param); 1460 1461 while (1) 1462 { 1463 int i; 1464 int suppressed = FALSE; 1465 const char *length_chars = NULL; 1466 enum format_lengths length_chars_val = FMT_LEN_none; 1467 enum format_std_version length_chars_std = STD_C89; 1468 int format_char; 1469 tree cur_param; 1470 tree wanted_type; 1471 int main_arg_num = 0; 1472 tree main_arg_params = 0; 1473 enum format_std_version wanted_type_std; 1474 const char *wanted_type_name; 1475 format_wanted_type width_wanted_type; 1476 format_wanted_type precision_wanted_type; 1477 format_wanted_type main_wanted_type; 1478 format_wanted_type *first_wanted_type = NULL; 1479 format_wanted_type *last_wanted_type = NULL; 1480 const format_length_info *fli = NULL; 1481 const format_char_info *fci = NULL; 1482 char flag_chars[256]; 1483 int alloc_flag = 0; 1484 int scalar_identity_flag = 0; 1485 const char *format_start = format_chars; 1486 if (*format_chars == 0) 1487 { 1488 if (format_chars - orig_format_chars != format_length) 1489 warning (OPT_Wformat_contains_nul, "embedded %<\\0%> in format"); 1490 if (info->first_arg_num != 0 && params != 0 1491 && has_operand_number <= 0) 1492 { 1493 res->number_other--; 1494 res->number_extra_args++; 1495 } 1496 if (has_operand_number > 0) 1497 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK); 1498 return; 1499 } 1500 if (*format_chars++ != '%') 1501 continue; 1502 if (*format_chars == 0) 1503 { 1504 warning (OPT_Wformat, "spurious trailing %<%%%> in format"); 1505 continue; 1506 } 1507 if (*format_chars == '%') 1508 { 1509 ++format_chars; 1510 continue; 1511 } 1512 flag_chars[0] = 0; 1513 1514 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0) 1515 { 1516 /* Possibly read a $ operand number at the start of the format. 1517 If one was previously used, one is required here. If one 1518 is not used here, we can't immediately conclude this is a 1519 format without them, since it could be printf %m or scanf %*. */ 1520 int opnum; 1521 opnum = maybe_read_dollar_number (&format_chars, 0, 1522 first_fillin_param, 1523 &main_arg_params, fki); 1524 if (opnum == -1) 1525 return; 1526 else if (opnum > 0) 1527 { 1528 has_operand_number = 1; 1529 main_arg_num = opnum + info->first_arg_num - 1; 1530 } 1531 } 1532 else if (fki->flags & FMT_FLAG_USE_DOLLAR) 1533 { 1534 if (avoid_dollar_number (format_chars)) 1535 return; 1536 } 1537 1538 /* Read any format flags, but do not yet validate them beyond removing 1539 duplicates, since in general validation depends on the rest of 1540 the format. */ 1541 while (*format_chars != 0 1542 && strchr (fki->flag_chars, *format_chars) != 0) 1543 { 1544 const format_flag_spec *s = get_flag_spec (flag_specs, 1545 *format_chars, NULL); 1546 if (strchr (flag_chars, *format_chars) != 0) 1547 { 1548 warning (OPT_Wformat, "repeated %s in format", _(s->name)); 1549 } 1550 else 1551 { 1552 i = strlen (flag_chars); 1553 flag_chars[i++] = *format_chars; 1554 flag_chars[i] = 0; 1555 } 1556 if (s->skip_next_char) 1557 { 1558 ++format_chars; 1559 if (*format_chars == 0) 1560 { 1561 warning (OPT_Wformat, "missing fill character at end of strfmon format"); 1562 return; 1563 } 1564 } 1565 ++format_chars; 1566 } 1567 1568 /* Read any format width, possibly * or *m$. */ 1569 if (fki->width_char != 0) 1570 { 1571 if (fki->width_type != NULL && *format_chars == '*') 1572 { 1573 i = strlen (flag_chars); 1574 flag_chars[i++] = fki->width_char; 1575 flag_chars[i] = 0; 1576 /* "...a field width...may be indicated by an asterisk. 1577 In this case, an int argument supplies the field width..." */ 1578 ++format_chars; 1579 if (has_operand_number != 0) 1580 { 1581 int opnum; 1582 opnum = maybe_read_dollar_number (&format_chars, 1583 has_operand_number == 1, 1584 first_fillin_param, 1585 ¶ms, fki); 1586 if (opnum == -1) 1587 return; 1588 else if (opnum > 0) 1589 { 1590 has_operand_number = 1; 1591 arg_num = opnum + info->first_arg_num - 1; 1592 } 1593 else 1594 has_operand_number = 0; 1595 } 1596 else 1597 { 1598 if (avoid_dollar_number (format_chars)) 1599 return; 1600 } 1601 if (info->first_arg_num != 0) 1602 { 1603 if (params == 0) 1604 { 1605 warning (OPT_Wformat, "too few arguments for format"); 1606 return; 1607 } 1608 cur_param = TREE_VALUE (params); 1609 if (has_operand_number <= 0) 1610 { 1611 params = TREE_CHAIN (params); 1612 ++arg_num; 1613 } 1614 width_wanted_type.wanted_type = *fki->width_type; 1615 width_wanted_type.wanted_type_name = NULL; 1616 width_wanted_type.pointer_count = 0; 1617 width_wanted_type.char_lenient_flag = 0; 1618 width_wanted_type.scalar_identity_flag = 0; 1619 width_wanted_type.writing_in_flag = 0; 1620 width_wanted_type.reading_from_flag = 0; 1621 width_wanted_type.name = _("field width"); 1622 width_wanted_type.param = cur_param; 1623 width_wanted_type.arg_num = arg_num; 1624 width_wanted_type.next = NULL; 1625 if (last_wanted_type != 0) 1626 last_wanted_type->next = &width_wanted_type; 1627 if (first_wanted_type == 0) 1628 first_wanted_type = &width_wanted_type; 1629 last_wanted_type = &width_wanted_type; 1630 } 1631 } 1632 else 1633 { 1634 /* Possibly read a numeric width. If the width is zero, 1635 we complain if appropriate. */ 1636 int non_zero_width_char = FALSE; 1637 int found_width = FALSE; 1638 while (ISDIGIT (*format_chars)) 1639 { 1640 found_width = TRUE; 1641 if (*format_chars != '0') 1642 non_zero_width_char = TRUE; 1643 ++format_chars; 1644 } 1645 if (found_width && !non_zero_width_char && 1646 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD)) 1647 warning (OPT_Wformat, "zero width in %s format", fki->name); 1648 if (found_width) 1649 { 1650 i = strlen (flag_chars); 1651 flag_chars[i++] = fki->width_char; 1652 flag_chars[i] = 0; 1653 } 1654 } 1655 } 1656 1657 /* Read any format left precision (must be a number, not *). */ 1658 if (fki->left_precision_char != 0 && *format_chars == '#') 1659 { 1660 ++format_chars; 1661 i = strlen (flag_chars); 1662 flag_chars[i++] = fki->left_precision_char; 1663 flag_chars[i] = 0; 1664 if (!ISDIGIT (*format_chars)) 1665 warning (OPT_Wformat, "empty left precision in %s format", fki->name); 1666 while (ISDIGIT (*format_chars)) 1667 ++format_chars; 1668 } 1669 1670 /* Read any format precision, possibly * or *m$. */ 1671 if (fki->precision_char != 0 && *format_chars == '.') 1672 { 1673 ++format_chars; 1674 i = strlen (flag_chars); 1675 flag_chars[i++] = fki->precision_char; 1676 flag_chars[i] = 0; 1677 if (fki->precision_type != NULL && *format_chars == '*') 1678 { 1679 /* "...a...precision...may be indicated by an asterisk. 1680 In this case, an int argument supplies the...precision." */ 1681 ++format_chars; 1682 if (has_operand_number != 0) 1683 { 1684 int opnum; 1685 opnum = maybe_read_dollar_number (&format_chars, 1686 has_operand_number == 1, 1687 first_fillin_param, 1688 ¶ms, fki); 1689 if (opnum == -1) 1690 return; 1691 else if (opnum > 0) 1692 { 1693 has_operand_number = 1; 1694 arg_num = opnum + info->first_arg_num - 1; 1695 } 1696 else 1697 has_operand_number = 0; 1698 } 1699 else 1700 { 1701 if (avoid_dollar_number (format_chars)) 1702 return; 1703 } 1704 if (info->first_arg_num != 0) 1705 { 1706 if (params == 0) 1707 { 1708 warning (OPT_Wformat, "too few arguments for format"); 1709 return; 1710 } 1711 cur_param = TREE_VALUE (params); 1712 if (has_operand_number <= 0) 1713 { 1714 params = TREE_CHAIN (params); 1715 ++arg_num; 1716 } 1717 precision_wanted_type.wanted_type = *fki->precision_type; 1718 precision_wanted_type.wanted_type_name = NULL; 1719 precision_wanted_type.pointer_count = 0; 1720 precision_wanted_type.char_lenient_flag = 0; 1721 precision_wanted_type.scalar_identity_flag = 0; 1722 precision_wanted_type.writing_in_flag = 0; 1723 precision_wanted_type.reading_from_flag = 0; 1724 precision_wanted_type.name = _("field precision"); 1725 precision_wanted_type.param = cur_param; 1726 precision_wanted_type.arg_num = arg_num; 1727 precision_wanted_type.next = NULL; 1728 if (last_wanted_type != 0) 1729 last_wanted_type->next = &precision_wanted_type; 1730 if (first_wanted_type == 0) 1731 first_wanted_type = &precision_wanted_type; 1732 last_wanted_type = &precision_wanted_type; 1733 } 1734 } 1735 else 1736 { 1737 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK) 1738 && !ISDIGIT (*format_chars)) 1739 warning (OPT_Wformat, "empty precision in %s format", fki->name); 1740 while (ISDIGIT (*format_chars)) 1741 ++format_chars; 1742 } 1743 } 1744 1745 if (fki->alloc_char && fki->alloc_char == *format_chars) 1746 { 1747 i = strlen (flag_chars); 1748 flag_chars[i++] = fki->alloc_char; 1749 flag_chars[i] = 0; 1750 format_chars++; 1751 } 1752 1753 /* Handle the scanf allocation kludge. */ 1754 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 1755 { 1756 if (*format_chars == 'a' && !flag_isoc99) 1757 { 1758 if (format_chars[1] == 's' || format_chars[1] == 'S' 1759 || format_chars[1] == '[') 1760 { 1761 /* 'a' is used as a flag. */ 1762 i = strlen (flag_chars); 1763 flag_chars[i++] = 'a'; 1764 flag_chars[i] = 0; 1765 format_chars++; 1766 } 1767 } 1768 } 1769 1770 /* Read any length modifier, if this kind of format has them. */ 1771 fli = fki->length_char_specs; 1772 length_chars = NULL; 1773 length_chars_val = FMT_LEN_none; 1774 length_chars_std = STD_C89; 1775 scalar_identity_flag = 0; 1776 if (fli) 1777 { 1778 while (fli->name != 0 1779 && strncmp (fli->name, format_chars, strlen (fli->name))) 1780 fli++; 1781 if (fli->name != 0) 1782 { 1783 format_chars += strlen (fli->name); 1784 if (fli->double_name != 0 && fli->name[0] == *format_chars) 1785 { 1786 format_chars++; 1787 length_chars = fli->double_name; 1788 length_chars_val = fli->double_index; 1789 length_chars_std = fli->double_std; 1790 } 1791 else 1792 { 1793 length_chars = fli->name; 1794 length_chars_val = fli->index; 1795 length_chars_std = fli->std; 1796 scalar_identity_flag = fli->scalar_identity_flag; 1797 } 1798 i = strlen (flag_chars); 1799 flag_chars[i++] = fki->length_code_char; 1800 flag_chars[i] = 0; 1801 } 1802 if (pedantic) 1803 { 1804 /* Warn if the length modifier is non-standard. */ 1805 if (ADJ_STD (length_chars_std) > C_STD_VER) 1806 warning (OPT_Wformat, 1807 "%s does not support the %qs %s length modifier", 1808 C_STD_NAME (length_chars_std), length_chars, 1809 fki->name); 1810 } 1811 } 1812 1813 /* Read any modifier (strftime E/O). */ 1814 if (fki->modifier_chars != NULL) 1815 { 1816 while (*format_chars != 0 1817 && strchr (fki->modifier_chars, *format_chars) != 0) 1818 { 1819 if (strchr (flag_chars, *format_chars) != 0) 1820 { 1821 const format_flag_spec *s = get_flag_spec (flag_specs, 1822 *format_chars, NULL); 1823 warning (OPT_Wformat, "repeated %s in format", _(s->name)); 1824 } 1825 else 1826 { 1827 i = strlen (flag_chars); 1828 flag_chars[i++] = *format_chars; 1829 flag_chars[i] = 0; 1830 } 1831 ++format_chars; 1832 } 1833 } 1834 1835 format_char = *format_chars; 1836 if (format_char == 0 1837 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK) 1838 && format_char == '%')) 1839 { 1840 warning (OPT_Wformat, "conversion lacks type at end of format"); 1841 continue; 1842 } 1843 format_chars++; 1844 fci = fki->conversion_specs; 1845 while (fci->format_chars != 0 1846 && strchr (fci->format_chars, format_char) == 0) 1847 ++fci; 1848 if (fci->format_chars == 0) 1849 { 1850 if (ISGRAPH (format_char)) 1851 warning (OPT_Wformat, "unknown conversion type character %qc in format", 1852 format_char); 1853 else 1854 warning (OPT_Wformat, "unknown conversion type character 0x%x in format", 1855 format_char); 1856 continue; 1857 } 1858 if (pedantic) 1859 { 1860 if (ADJ_STD (fci->std) > C_STD_VER) 1861 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format", 1862 C_STD_NAME (fci->std), format_char, fki->name); 1863 } 1864 1865 /* Validate the individual flags used, removing any that are invalid. */ 1866 { 1867 int d = 0; 1868 for (i = 0; flag_chars[i] != 0; i++) 1869 { 1870 const format_flag_spec *s = get_flag_spec (flag_specs, 1871 flag_chars[i], NULL); 1872 flag_chars[i - d] = flag_chars[i]; 1873 if (flag_chars[i] == fki->length_code_char) 1874 continue; 1875 if (strchr (fci->flag_chars, flag_chars[i]) == 0) 1876 { 1877 warning (OPT_Wformat, "%s used with %<%%%c%> %s format", 1878 _(s->name), format_char, fki->name); 1879 d++; 1880 continue; 1881 } 1882 if (pedantic) 1883 { 1884 const format_flag_spec *t; 1885 if (ADJ_STD (s->std) > C_STD_VER) 1886 warning (OPT_Wformat, "%s does not support %s", 1887 C_STD_NAME (s->std), _(s->long_name)); 1888 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2); 1889 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std)) 1890 { 1891 const char *long_name = (t->long_name != NULL 1892 ? t->long_name 1893 : s->long_name); 1894 if (ADJ_STD (t->std) > C_STD_VER) 1895 warning (OPT_Wformat, 1896 "%s does not support %s with the %<%%%c%> %s format", 1897 C_STD_NAME (t->std), _(long_name), 1898 format_char, fki->name); 1899 } 1900 } 1901 } 1902 flag_chars[i - d] = 0; 1903 } 1904 1905 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 1906 && strchr (flag_chars, 'a') != 0) 1907 alloc_flag = 1; 1908 if (fki->alloc_char && strchr (flag_chars, fki->alloc_char) != 0) 1909 alloc_flag = 1; 1910 1911 if (fki->suppression_char 1912 && strchr (flag_chars, fki->suppression_char) != 0) 1913 suppressed = 1; 1914 1915 /* Validate the pairs of flags used. */ 1916 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++) 1917 { 1918 const format_flag_spec *s, *t; 1919 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0) 1920 continue; 1921 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0) 1922 continue; 1923 if (bad_flag_pairs[i].predicate != 0 1924 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0) 1925 continue; 1926 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL); 1927 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL); 1928 if (bad_flag_pairs[i].ignored) 1929 { 1930 if (bad_flag_pairs[i].predicate != 0) 1931 warning (OPT_Wformat, 1932 "%s ignored with %s and %<%%%c%> %s format", 1933 _(s->name), _(t->name), format_char, 1934 fki->name); 1935 else 1936 warning (OPT_Wformat, "%s ignored with %s in %s format", 1937 _(s->name), _(t->name), fki->name); 1938 } 1939 else 1940 { 1941 if (bad_flag_pairs[i].predicate != 0) 1942 warning (OPT_Wformat, 1943 "use of %s and %s together with %<%%%c%> %s format", 1944 _(s->name), _(t->name), format_char, 1945 fki->name); 1946 else 1947 warning (OPT_Wformat, "use of %s and %s together in %s format", 1948 _(s->name), _(t->name), fki->name); 1949 } 1950 } 1951 1952 /* Give Y2K warnings. */ 1953 if (warn_format_y2k) 1954 { 1955 int y2k_level = 0; 1956 if (strchr (fci->flags2, '4') != 0) 1957 if (strchr (flag_chars, 'E') != 0) 1958 y2k_level = 3; 1959 else 1960 y2k_level = 2; 1961 else if (strchr (fci->flags2, '3') != 0) 1962 y2k_level = 3; 1963 else if (strchr (fci->flags2, '2') != 0) 1964 y2k_level = 2; 1965 if (y2k_level == 3) 1966 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of " 1967 "year in some locales", format_char); 1968 else if (y2k_level == 2) 1969 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of " 1970 "year", format_char); 1971 } 1972 1973 if (strchr (fci->flags2, '[') != 0) 1974 { 1975 /* Skip over scan set, in case it happens to have '%' in it. */ 1976 if (*format_chars == '^') 1977 ++format_chars; 1978 /* Find closing bracket; if one is hit immediately, then 1979 it's part of the scan set rather than a terminator. */ 1980 if (*format_chars == ']') 1981 ++format_chars; 1982 while (*format_chars && *format_chars != ']') 1983 ++format_chars; 1984 if (*format_chars != ']') 1985 /* The end of the format string was reached. */ 1986 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format"); 1987 } 1988 1989 wanted_type = 0; 1990 wanted_type_name = 0; 1991 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT) 1992 { 1993 wanted_type = (fci->types[length_chars_val].type 1994 ? *fci->types[length_chars_val].type : 0); 1995 wanted_type_name = fci->types[length_chars_val].name; 1996 wanted_type_std = fci->types[length_chars_val].std; 1997 if (wanted_type == 0) 1998 { 1999 warning (OPT_Wformat, 2000 "use of %qs length modifier with %qc type character", 2001 length_chars, format_char); 2002 /* Heuristic: skip one argument when an invalid length/type 2003 combination is encountered. */ 2004 arg_num++; 2005 if (params == 0) 2006 { 2007 warning (OPT_Wformat, "too few arguments for format"); 2008 return; 2009 } 2010 params = TREE_CHAIN (params); 2011 continue; 2012 } 2013 else if (pedantic 2014 /* Warn if non-standard, provided it is more non-standard 2015 than the length and type characters that may already 2016 have been warned for. */ 2017 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std) 2018 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std)) 2019 { 2020 if (ADJ_STD (wanted_type_std) > C_STD_VER) 2021 warning (OPT_Wformat, 2022 "%s does not support the %<%%%s%c%> %s format", 2023 C_STD_NAME (wanted_type_std), length_chars, 2024 format_char, fki->name); 2025 } 2026 } 2027 2028 main_wanted_type.next = NULL; 2029 2030 /* Finally. . .check type of argument against desired type! */ 2031 if (info->first_arg_num == 0) 2032 continue; 2033 if ((fci->pointer_count == 0 && wanted_type == void_type_node) 2034 || suppressed) 2035 { 2036 if (main_arg_num != 0) 2037 { 2038 if (suppressed) 2039 warning (OPT_Wformat, "operand number specified with " 2040 "suppressed assignment"); 2041 else 2042 warning (OPT_Wformat, "operand number specified for format " 2043 "taking no argument"); 2044 } 2045 } 2046 else 2047 { 2048 format_wanted_type *wanted_type_ptr; 2049 2050 if (main_arg_num != 0) 2051 { 2052 arg_num = main_arg_num; 2053 params = main_arg_params; 2054 } 2055 else 2056 { 2057 ++arg_num; 2058 if (has_operand_number > 0) 2059 { 2060 warning (OPT_Wformat, "missing $ operand number in format"); 2061 return; 2062 } 2063 else 2064 has_operand_number = 0; 2065 } 2066 2067 wanted_type_ptr = &main_wanted_type; 2068 while (fci) 2069 { 2070 if (params == 0) 2071 { 2072 warning (OPT_Wformat, "too few arguments for format"); 2073 return; 2074 } 2075 2076 cur_param = TREE_VALUE (params); 2077 params = TREE_CHAIN (params); 2078 2079 wanted_type_ptr->wanted_type = wanted_type; 2080 wanted_type_ptr->wanted_type_name = wanted_type_name; 2081 wanted_type_ptr->pointer_count = fci->pointer_count + alloc_flag; 2082 wanted_type_ptr->char_lenient_flag = 0; 2083 if (strchr (fci->flags2, 'c') != 0) 2084 wanted_type_ptr->char_lenient_flag = 1; 2085 wanted_type_ptr->scalar_identity_flag = 0; 2086 if (scalar_identity_flag) 2087 wanted_type_ptr->scalar_identity_flag = 1; 2088 wanted_type_ptr->writing_in_flag = 0; 2089 wanted_type_ptr->reading_from_flag = 0; 2090 if (alloc_flag) 2091 wanted_type_ptr->writing_in_flag = 1; 2092 else 2093 { 2094 if (strchr (fci->flags2, 'W') != 0) 2095 wanted_type_ptr->writing_in_flag = 1; 2096 if (strchr (fci->flags2, 'R') != 0) 2097 wanted_type_ptr->reading_from_flag = 1; 2098 } 2099 wanted_type_ptr->name = NULL; 2100 wanted_type_ptr->param = cur_param; 2101 wanted_type_ptr->arg_num = arg_num; 2102 wanted_type_ptr->next = NULL; 2103 if (last_wanted_type != 0) 2104 last_wanted_type->next = wanted_type_ptr; 2105 if (first_wanted_type == 0) 2106 first_wanted_type = wanted_type_ptr; 2107 last_wanted_type = wanted_type_ptr; 2108 2109 fci = fci->chain; 2110 if (fci) 2111 { 2112 wanted_type_ptr = (format_wanted_type *) 2113 pool_alloc (fwt_pool); 2114 arg_num++; 2115 wanted_type = *fci->types[length_chars_val].type; 2116 wanted_type_name = fci->types[length_chars_val].name; 2117 } 2118 } 2119 } 2120 2121 if (first_wanted_type != 0) 2122 check_format_types (first_wanted_type, format_start, 2123 format_chars - format_start); 2124 } 2125} 2126 2127 2128/* Check the argument types from a single format conversion (possibly 2129 including width and precision arguments). */ 2130static void 2131check_format_types (format_wanted_type *types, const char *format_start, 2132 int format_length) 2133{ 2134 for (; types != 0; types = types->next) 2135 { 2136 tree cur_param; 2137 tree cur_type; 2138 tree orig_cur_type; 2139 tree wanted_type; 2140 int arg_num; 2141 int i; 2142 int char_type_flag; 2143 cur_param = types->param; 2144 cur_type = TREE_TYPE (cur_param); 2145 if (cur_type == error_mark_node) 2146 continue; 2147 orig_cur_type = cur_type; 2148 char_type_flag = 0; 2149 wanted_type = types->wanted_type; 2150 arg_num = types->arg_num; 2151 2152 /* The following should not occur here. */ 2153 gcc_assert (wanted_type); 2154 gcc_assert (wanted_type != void_type_node || types->pointer_count); 2155 2156 if (types->pointer_count == 0) 2157 wanted_type = lang_hooks.types.type_promotes_to (wanted_type); 2158 2159 wanted_type = TYPE_MAIN_VARIANT (wanted_type); 2160 2161 STRIP_NOPS (cur_param); 2162 2163 /* Check the types of any additional pointer arguments 2164 that precede the "real" argument. */ 2165 for (i = 0; i < types->pointer_count; ++i) 2166 { 2167 if (TREE_CODE (cur_type) == POINTER_TYPE) 2168 { 2169 cur_type = TREE_TYPE (cur_type); 2170 if (cur_type == error_mark_node) 2171 break; 2172 2173 /* Check for writing through a NULL pointer. */ 2174 if (types->writing_in_flag 2175 && i == 0 2176 && cur_param != 0 2177 && integer_zerop (cur_param)) 2178 warning (OPT_Wformat, "writing through null pointer " 2179 "(argument %d)", arg_num); 2180 2181 /* Check for reading through a NULL pointer. */ 2182 if (types->reading_from_flag 2183 && i == 0 2184 && cur_param != 0 2185 && integer_zerop (cur_param)) 2186 warning (OPT_Wformat, "reading through null pointer " 2187 "(argument %d)", arg_num); 2188 2189 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR) 2190 cur_param = TREE_OPERAND (cur_param, 0); 2191 else 2192 cur_param = 0; 2193 2194 /* See if this is an attempt to write into a const type with 2195 scanf or with printf "%n". Note: the writing in happens 2196 at the first indirection only, if for example 2197 void * const * is passed to scanf %p; passing 2198 const void ** is simply passing an incompatible type. */ 2199 if (types->writing_in_flag 2200 && i == 0 2201 && (TYPE_READONLY (cur_type) 2202 || (cur_param != 0 2203 && (CONSTANT_CLASS_P (cur_param) 2204 || (DECL_P (cur_param) 2205 && TREE_READONLY (cur_param)))))) 2206 warning (OPT_Wformat, "writing into constant object " 2207 "(argument %d)", arg_num); 2208 2209 /* If there are extra type qualifiers beyond the first 2210 indirection, then this makes the types technically 2211 incompatible. */ 2212 if (i > 0 2213 && pedantic 2214 && (TYPE_READONLY (cur_type) 2215 || TYPE_VOLATILE (cur_type) 2216 || TYPE_RESTRICT (cur_type))) 2217 warning (OPT_Wformat, "extra type qualifiers in format " 2218 "argument (argument %d)", 2219 arg_num); 2220 2221 } 2222 else 2223 { 2224 format_type_warning (types->name, format_start, format_length, 2225 wanted_type, types->pointer_count, 2226 types->wanted_type_name, orig_cur_type, 2227 arg_num); 2228 break; 2229 } 2230 } 2231 2232 if (i < types->pointer_count) 2233 continue; 2234 2235 cur_type = TYPE_MAIN_VARIANT (cur_type); 2236 2237 /* Check whether the argument type is a character type. This leniency 2238 only applies to certain formats, flagged with 'c'. 2239 */ 2240 if (types->char_lenient_flag) 2241 char_type_flag = (cur_type == char_type_node 2242 || cur_type == signed_char_type_node 2243 || cur_type == unsigned_char_type_node); 2244 2245 /* Check the type of the "real" argument, if there's a type we want. */ 2246 if (lang_hooks.types_compatible_p (wanted_type, cur_type)) 2247 continue; 2248 /* If we want 'void *', allow any pointer type. 2249 (Anything else would already have got a warning.) 2250 With -pedantic, only allow pointers to void and to character 2251 types. */ 2252 if (wanted_type == void_type_node 2253 && (!pedantic || (i == 1 && char_type_flag))) 2254 continue; 2255 /* Don't warn about differences merely in signedness, unless 2256 -pedantic. With -pedantic, warn if the type is a pointer 2257 target and not a character type, and for character types at 2258 a second level of indirection. */ 2259 if (TREE_CODE (wanted_type) == INTEGER_TYPE 2260 && TREE_CODE (cur_type) == INTEGER_TYPE 2261 && (!pedantic || i == 0 || (i == 1 && char_type_flag)) 2262 && (TYPE_UNSIGNED (wanted_type) 2263 ? wanted_type == c_common_unsigned_type (cur_type) 2264 : wanted_type == c_common_signed_type (cur_type))) 2265 continue; 2266 /* Likewise, "signed char", "unsigned char" and "char" are 2267 equivalent but the above test won't consider them equivalent. */ 2268 if (wanted_type == char_type_node 2269 && (!pedantic || i < 2) 2270 && char_type_flag) 2271 continue; 2272 if (types->scalar_identity_flag 2273 && (TREE_CODE (cur_type) == TREE_CODE (wanted_type) 2274 || (INTEGRAL_TYPE_P (cur_type) 2275 && INTEGRAL_TYPE_P (wanted_type))) 2276 && TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type)) 2277 continue; 2278 /* Now we have a type mismatch. */ 2279 format_type_warning (types->name, format_start, format_length, 2280 wanted_type, types->pointer_count, 2281 types->wanted_type_name, orig_cur_type, arg_num); 2282 } 2283} 2284 2285 2286/* Give a warning about a format argument of different type from that 2287 expected. DESCR is a description such as "field precision", or 2288 NULL for an ordinary format. For an ordinary format, FORMAT_START 2289 points to where the format starts in the format string and 2290 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument 2291 should have after POINTER_COUNT pointer dereferences. 2292 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE, 2293 or NULL if the ordinary name of the type should be used. ARG_TYPE 2294 is the type of the actual argument. ARG_NUM is the number of that 2295 argument. */ 2296static void 2297format_type_warning (const char *descr, const char *format_start, 2298 int format_length, tree wanted_type, int pointer_count, 2299 const char *wanted_type_name, tree arg_type, int arg_num) 2300{ 2301 char *p; 2302 /* If ARG_TYPE is a typedef with a misleading name (for example, 2303 size_t but not the standard size_t expected by printf %zu), avoid 2304 printing the typedef name. */ 2305 if (wanted_type_name 2306 && TYPE_NAME (arg_type) 2307 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL 2308 && DECL_NAME (TYPE_NAME (arg_type)) 2309 && !strcmp (wanted_type_name, 2310 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2))) 2311 arg_type = TYPE_MAIN_VARIANT (arg_type); 2312 /* The format type and name exclude any '*' for pointers, so those 2313 must be formatted manually. For all the types we currently have, 2314 this is adequate, but formats taking pointers to functions or 2315 arrays would require the full type to be built up in order to 2316 print it with %T. */ 2317 p = (char *) alloca (pointer_count + 2); 2318 if (pointer_count == 0) 2319 p[0] = 0; 2320 else if (c_dialect_cxx ()) 2321 { 2322 memset (p, '*', pointer_count); 2323 p[pointer_count] = 0; 2324 } 2325 else 2326 { 2327 p[0] = ' '; 2328 memset (p + 1, '*', pointer_count); 2329 p[pointer_count + 1] = 0; 2330 } 2331 if (wanted_type_name) 2332 { 2333 if (descr) 2334 warning (OPT_Wformat, "%s should have type %<%s%s%>, " 2335 "but argument %d has type %qT", 2336 descr, wanted_type_name, p, arg_num, arg_type); 2337 else 2338 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, " 2339 "but argument %d has type %qT", 2340 format_length, format_start, wanted_type_name, p, 2341 arg_num, arg_type); 2342 } 2343 else 2344 { 2345 if (descr) 2346 warning (OPT_Wformat, "%s should have type %<%T%s%>, " 2347 "but argument %d has type %qT", 2348 descr, wanted_type, p, arg_num, arg_type); 2349 else 2350 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, " 2351 "but argument %d has type %qT", 2352 format_length, format_start, wanted_type, p, arg_num, arg_type); 2353 } 2354} 2355 2356 2357/* Given a format_char_info array FCI, and a character C, this function 2358 returns the index into the conversion_specs where that specifier's 2359 data is located. The character must exist. */ 2360static unsigned int 2361find_char_info_specifier_index (const format_char_info *fci, int c) 2362{ 2363 unsigned i; 2364 2365 for (i = 0; fci->format_chars; i++, fci++) 2366 if (strchr (fci->format_chars, c)) 2367 return i; 2368 2369 /* We shouldn't be looking for a non-existent specifier. */ 2370 gcc_unreachable (); 2371} 2372 2373/* Given a format_length_info array FLI, and a character C, this 2374 function returns the index into the conversion_specs where that 2375 modifier's data is located. The character must exist. */ 2376static unsigned int 2377find_length_info_modifier_index (const format_length_info *fli, int c) 2378{ 2379 unsigned i; 2380 2381 for (i = 0; fli->name; i++, fli++) 2382 if (strchr (fli->name, c)) 2383 return i; 2384 2385 /* We shouldn't be looking for a non-existent modifier. */ 2386 gcc_unreachable (); 2387} 2388 2389/* Determine the type of HOST_WIDE_INT in the code being compiled for 2390 use in GCC's __asm_fprintf__ custom format attribute. You must 2391 have set dynamic_format_types before calling this function. */ 2392static void 2393init_dynamic_asm_fprintf_info (void) 2394{ 2395 static tree hwi; 2396 2397 if (!hwi) 2398 { 2399 format_length_info *new_asm_fprintf_length_specs; 2400 unsigned int i; 2401 2402 /* Find the underlying type for HOST_WIDE_INT. For the %w 2403 length modifier to work, one must have issued: "typedef 2404 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 2405 prior to using that modifier. */ 2406 hwi = maybe_get_identifier ("__gcc_host_wide_int__"); 2407 if (!hwi) 2408 { 2409 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2410 return; 2411 } 2412 hwi = identifier_global_value (hwi); 2413 if (!hwi || TREE_CODE (hwi) != TYPE_DECL) 2414 { 2415 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2416 return; 2417 } 2418 hwi = DECL_ORIGINAL_TYPE (hwi); 2419 gcc_assert (hwi); 2420 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node) 2421 { 2422 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>" 2423 " or %<long long%>"); 2424 return; 2425 } 2426 2427 /* Create a new (writable) copy of asm_fprintf_length_specs. */ 2428 new_asm_fprintf_length_specs = (format_length_info *) 2429 xmemdup (asm_fprintf_length_specs, 2430 sizeof (asm_fprintf_length_specs), 2431 sizeof (asm_fprintf_length_specs)); 2432 2433 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 2434 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w'); 2435 if (hwi == long_integer_type_node) 2436 new_asm_fprintf_length_specs[i].index = FMT_LEN_l; 2437 else if (hwi == long_long_integer_type_node) 2438 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll; 2439 else 2440 gcc_unreachable (); 2441 2442 /* Assign the new data for use. */ 2443 dynamic_format_types[asm_fprintf_format_type].length_char_specs = 2444 new_asm_fprintf_length_specs; 2445 } 2446} 2447 2448/* Determine the type of a "locus" in the code being compiled for use 2449 in GCC's __gcc_gfc__ custom format attribute. You must have set 2450 dynamic_format_types before calling this function. */ 2451static void 2452init_dynamic_gfc_info (void) 2453{ 2454 static tree locus; 2455 2456 if (!locus) 2457 { 2458 static format_char_info *gfc_fci; 2459 2460 /* For the GCC __gcc_gfc__ custom format specifier to work, one 2461 must have declared 'locus' prior to using this attribute. If 2462 we haven't seen this declarations then you shouldn't use the 2463 specifier requiring that type. */ 2464 if ((locus = maybe_get_identifier ("locus"))) 2465 { 2466 locus = identifier_global_value (locus); 2467 if (locus) 2468 { 2469 if (TREE_CODE (locus) != TYPE_DECL 2470 || TREE_TYPE (locus) == error_mark_node) 2471 { 2472 error ("%<locus%> is not defined as a type"); 2473 locus = 0; 2474 } 2475 else 2476 locus = TREE_TYPE (locus); 2477 } 2478 } 2479 2480 /* Assign the new data for use. */ 2481 2482 /* Handle the __gcc_gfc__ format specifics. */ 2483 if (!gfc_fci) 2484 dynamic_format_types[gcc_gfc_format_type].conversion_specs = 2485 gfc_fci = (format_char_info *) 2486 xmemdup (gcc_gfc_char_table, 2487 sizeof (gcc_gfc_char_table), 2488 sizeof (gcc_gfc_char_table)); 2489 if (locus) 2490 { 2491 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L'); 2492 gfc_fci[i].types[0].type = &locus; 2493 gfc_fci[i].pointer_count = 1; 2494 } 2495 } 2496} 2497 2498/* Determine the types of "tree" and "location_t" in the code being 2499 compiled for use in GCC's diagnostic custom format attributes. You 2500 must have set dynamic_format_types before calling this function. */ 2501static void 2502init_dynamic_diag_info (void) 2503{ 2504 static tree t, loc, hwi; 2505 2506 if (!loc || !t || !hwi) 2507 { 2508 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci; 2509 static format_length_info *diag_ls; 2510 unsigned int i; 2511 2512 /* For the GCC-diagnostics custom format specifiers to work, one 2513 must have declared 'tree' and/or 'location_t' prior to using 2514 those attributes. If we haven't seen these declarations then 2515 you shouldn't use the specifiers requiring these types. 2516 However we don't force a hard ICE because we may see only one 2517 or the other type. */ 2518 if ((loc = maybe_get_identifier ("location_t"))) 2519 { 2520 loc = identifier_global_value (loc); 2521 if (loc) 2522 { 2523 if (TREE_CODE (loc) != TYPE_DECL) 2524 { 2525 error ("%<location_t%> is not defined as a type"); 2526 loc = 0; 2527 } 2528 else 2529 loc = TREE_TYPE (loc); 2530 } 2531 } 2532 2533 /* We need to grab the underlying 'union tree_node' so peek into 2534 an extra type level. */ 2535 if ((t = maybe_get_identifier ("tree"))) 2536 { 2537 t = identifier_global_value (t); 2538 if (t) 2539 { 2540 if (TREE_CODE (t) != TYPE_DECL) 2541 { 2542 error ("%<tree%> is not defined as a type"); 2543 t = 0; 2544 } 2545 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE) 2546 { 2547 error ("%<tree%> is not defined as a pointer type"); 2548 t = 0; 2549 } 2550 else 2551 t = TREE_TYPE (TREE_TYPE (t)); 2552 } 2553 } 2554 2555 /* Find the underlying type for HOST_WIDE_INT. For the %w 2556 length modifier to work, one must have issued: "typedef 2557 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 2558 prior to using that modifier. */ 2559 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__"))) 2560 { 2561 hwi = identifier_global_value (hwi); 2562 if (hwi) 2563 { 2564 if (TREE_CODE (hwi) != TYPE_DECL) 2565 { 2566 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2567 hwi = 0; 2568 } 2569 else 2570 { 2571 hwi = DECL_ORIGINAL_TYPE (hwi); 2572 gcc_assert (hwi); 2573 if (hwi != long_integer_type_node 2574 && hwi != long_long_integer_type_node) 2575 { 2576 error ("%<__gcc_host_wide_int__%> is not defined" 2577 " as %<long%> or %<long long%>"); 2578 hwi = 0; 2579 } 2580 } 2581 } 2582 } 2583 2584 /* Assign the new data for use. */ 2585 2586 /* All the GCC diag formats use the same length specs. */ 2587 if (!diag_ls) 2588 dynamic_format_types[gcc_diag_format_type].length_char_specs = 2589 dynamic_format_types[gcc_tdiag_format_type].length_char_specs = 2590 dynamic_format_types[gcc_cdiag_format_type].length_char_specs = 2591 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs = 2592 diag_ls = (format_length_info *) 2593 xmemdup (gcc_diag_length_specs, 2594 sizeof (gcc_diag_length_specs), 2595 sizeof (gcc_diag_length_specs)); 2596 if (hwi) 2597 { 2598 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 2599 i = find_length_info_modifier_index (diag_ls, 'w'); 2600 if (hwi == long_integer_type_node) 2601 diag_ls[i].index = FMT_LEN_l; 2602 else if (hwi == long_long_integer_type_node) 2603 diag_ls[i].index = FMT_LEN_ll; 2604 else 2605 gcc_unreachable (); 2606 } 2607 2608 /* Handle the __gcc_diag__ format specifics. */ 2609 if (!diag_fci) 2610 dynamic_format_types[gcc_diag_format_type].conversion_specs = 2611 diag_fci = (format_char_info *) 2612 xmemdup (gcc_diag_char_table, 2613 sizeof (gcc_diag_char_table), 2614 sizeof (gcc_diag_char_table)); 2615 if (t) 2616 { 2617 i = find_char_info_specifier_index (diag_fci, 'K'); 2618 diag_fci[i].types[0].type = &t; 2619 diag_fci[i].pointer_count = 1; 2620 } 2621 2622 /* Handle the __gcc_tdiag__ format specifics. */ 2623 if (!tdiag_fci) 2624 dynamic_format_types[gcc_tdiag_format_type].conversion_specs = 2625 tdiag_fci = (format_char_info *) 2626 xmemdup (gcc_tdiag_char_table, 2627 sizeof (gcc_tdiag_char_table), 2628 sizeof (gcc_tdiag_char_table)); 2629 if (t) 2630 { 2631 /* All specifiers taking a tree share the same struct. */ 2632 i = find_char_info_specifier_index (tdiag_fci, 'D'); 2633 tdiag_fci[i].types[0].type = &t; 2634 tdiag_fci[i].pointer_count = 1; 2635 i = find_char_info_specifier_index (tdiag_fci, 'K'); 2636 tdiag_fci[i].types[0].type = &t; 2637 tdiag_fci[i].pointer_count = 1; 2638 } 2639 2640 /* Handle the __gcc_cdiag__ format specifics. */ 2641 if (!cdiag_fci) 2642 dynamic_format_types[gcc_cdiag_format_type].conversion_specs = 2643 cdiag_fci = (format_char_info *) 2644 xmemdup (gcc_cdiag_char_table, 2645 sizeof (gcc_cdiag_char_table), 2646 sizeof (gcc_cdiag_char_table)); 2647 if (t) 2648 { 2649 /* All specifiers taking a tree share the same struct. */ 2650 i = find_char_info_specifier_index (cdiag_fci, 'D'); 2651 cdiag_fci[i].types[0].type = &t; 2652 cdiag_fci[i].pointer_count = 1; 2653 i = find_char_info_specifier_index (cdiag_fci, 'K'); 2654 cdiag_fci[i].types[0].type = &t; 2655 cdiag_fci[i].pointer_count = 1; 2656 } 2657 2658 /* Handle the __gcc_cxxdiag__ format specifics. */ 2659 if (!cxxdiag_fci) 2660 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs = 2661 cxxdiag_fci = (format_char_info *) 2662 xmemdup (gcc_cxxdiag_char_table, 2663 sizeof (gcc_cxxdiag_char_table), 2664 sizeof (gcc_cxxdiag_char_table)); 2665 if (t) 2666 { 2667 /* All specifiers taking a tree share the same struct. */ 2668 i = find_char_info_specifier_index (cxxdiag_fci, 'D'); 2669 cxxdiag_fci[i].types[0].type = &t; 2670 cxxdiag_fci[i].pointer_count = 1; 2671 i = find_char_info_specifier_index (cxxdiag_fci, 'K'); 2672 cxxdiag_fci[i].types[0].type = &t; 2673 cxxdiag_fci[i].pointer_count = 1; 2674 } 2675 } 2676} 2677 2678#ifdef TARGET_FORMAT_TYPES 2679extern const format_kind_info TARGET_FORMAT_TYPES[]; 2680#endif 2681 2682#ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES 2683extern const target_ovr_attr TARGET_OVERRIDES_FORMAT_ATTRIBUTES[]; 2684#endif 2685#ifdef TARGET_OVERRIDES_FORMAT_INIT 2686 extern void TARGET_OVERRIDES_FORMAT_INIT (void); 2687#endif 2688 2689/* Attributes such as "printf" are equivalent to those such as 2690 "gnu_printf" unless this is overridden by a target. */ 2691static const target_ovr_attr gnu_target_overrides_format_attributes[] = 2692{ 2693 { "gnu_printf", "printf" }, 2694 { "gnu_scanf", "scanf" }, 2695 { "gnu_strftime", "strftime" }, 2696 { "gnu_strfmon", "strfmon" }, 2697 { NULL, NULL } 2698}; 2699 2700/* Translate to unified attribute name. This is used in decode_format_type and 2701 decode_format_attr. In attr_name the user specified argument is passed. It 2702 returns the unified format name from TARGET_OVERRIDES_FORMAT_ATTRIBUTES 2703 or the attr_name passed to this function, if there is no matching entry. */ 2704static const char * 2705convert_format_name_to_system_name (const char *attr_name) 2706{ 2707 int i; 2708 2709 if (attr_name == NULL || *attr_name == 0 2710 || strncmp (attr_name, "gcc_", 4) == 0) 2711 return attr_name; 2712#ifdef TARGET_OVERRIDES_FORMAT_INIT 2713 TARGET_OVERRIDES_FORMAT_INIT (); 2714#endif 2715 2716#ifdef TARGET_OVERRIDES_FORMAT_ATTRIBUTES 2717 /* Check if format attribute is overridden by target. */ 2718 if (TARGET_OVERRIDES_FORMAT_ATTRIBUTES != NULL 2719 && TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT > 0) 2720 { 2721 for (i = 0; i < TARGET_OVERRIDES_FORMAT_ATTRIBUTES_COUNT; ++i) 2722 { 2723 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src, 2724 attr_name)) 2725 return attr_name; 2726 if (cmp_attribs (TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_dst, 2727 attr_name)) 2728 return TARGET_OVERRIDES_FORMAT_ATTRIBUTES[i].named_attr_src; 2729 } 2730 } 2731#endif 2732 /* Otherwise default to gnu format. */ 2733 for (i = 0; 2734 gnu_target_overrides_format_attributes[i].named_attr_src != NULL; 2735 ++i) 2736 { 2737 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_src, 2738 attr_name)) 2739 return attr_name; 2740 if (cmp_attribs (gnu_target_overrides_format_attributes[i].named_attr_dst, 2741 attr_name)) 2742 return gnu_target_overrides_format_attributes[i].named_attr_src; 2743 } 2744 2745 return attr_name; 2746} 2747 2748/* Return true if TATTR_NAME and ATTR_NAME are the same format attribute, 2749 counting "name" and "__name__" as the same, false otherwise. */ 2750static bool 2751cmp_attribs (const char *tattr_name, const char *attr_name) 2752{ 2753 int alen = strlen (attr_name); 2754 int slen = (tattr_name ? strlen (tattr_name) : 0); 2755 if (alen > 4 && attr_name[0] == '_' && attr_name[1] == '_' 2756 && attr_name[alen - 1] == '_' && attr_name[alen - 2] == '_') 2757 { 2758 attr_name += 2; 2759 alen -= 4; 2760 } 2761 if (alen != slen || strncmp (tattr_name, attr_name, alen) != 0) 2762 return false; 2763 return true; 2764} 2765 2766/* Handle a "format" attribute; arguments as in 2767 struct attribute_spec.handler. */ 2768tree 2769handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args, 2770 int flags, bool *no_add_attrs) 2771{ 2772 tree type = *node; 2773 function_format_info info; 2774 tree argument; 2775 2776#ifdef TARGET_FORMAT_TYPES 2777 /* If the target provides additional format types, we need to 2778 add them to FORMAT_TYPES at first use. */ 2779 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types) 2780 { 2781 dynamic_format_types = XNEWVEC (format_kind_info, 2782 n_format_types + TARGET_N_FORMAT_TYPES); 2783 memcpy (dynamic_format_types, format_types_orig, 2784 sizeof (format_types_orig)); 2785 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES, 2786 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0])); 2787 2788 format_types = dynamic_format_types; 2789 n_format_types += TARGET_N_FORMAT_TYPES; 2790 } 2791#endif 2792 2793 if (!decode_format_attr (args, &info, 0)) 2794 { 2795 *no_add_attrs = true; 2796 return NULL_TREE; 2797 } 2798 2799 argument = TYPE_ARG_TYPES (type); 2800 if (argument) 2801 { 2802 if (!check_format_string (argument, info.format_num, flags, 2803 no_add_attrs)) 2804 return NULL_TREE; 2805 2806 if (info.first_arg_num != 0) 2807 { 2808 unsigned HOST_WIDE_INT arg_num = 1; 2809 2810 /* Verify that first_arg_num points to the last arg, 2811 the ... */ 2812 while (argument) 2813 arg_num++, argument = TREE_CHAIN (argument); 2814 2815 if (arg_num != info.first_arg_num) 2816 { 2817 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 2818 error ("args to be formatted is not %<...%>"); 2819 *no_add_attrs = true; 2820 return NULL_TREE; 2821 } 2822 } 2823 } 2824 2825 /* Check if this is a strftime variant. Just for this variant 2826 FMT_FLAG_ARG_CONVERT is not set. */ 2827 if ((format_types[info.format_type].flags & (int) FMT_FLAG_ARG_CONVERT) == 0 2828 && info.first_arg_num != 0) 2829 { 2830 error ("strftime formats cannot format arguments"); 2831 *no_add_attrs = true; 2832 return NULL_TREE; 2833 } 2834 2835 /* If this is a custom GCC-internal format type, we have to 2836 initialize certain bits at runtime. */ 2837 if (info.format_type == asm_fprintf_format_type 2838 || info.format_type == gcc_gfc_format_type 2839 || info.format_type == gcc_diag_format_type 2840 || info.format_type == gcc_tdiag_format_type 2841 || info.format_type == gcc_cdiag_format_type 2842 || info.format_type == gcc_cxxdiag_format_type) 2843 { 2844 /* Our first time through, we have to make sure that our 2845 format_type data is allocated dynamically and is modifiable. */ 2846 if (!dynamic_format_types) 2847 format_types = dynamic_format_types = (format_kind_info *) 2848 xmemdup (format_types_orig, sizeof (format_types_orig), 2849 sizeof (format_types_orig)); 2850 2851 /* If this is format __asm_fprintf__, we have to initialize 2852 GCC's notion of HOST_WIDE_INT for checking %wd. */ 2853 if (info.format_type == asm_fprintf_format_type) 2854 init_dynamic_asm_fprintf_info (); 2855 /* If this is format __gcc_gfc__, we have to initialize GCC's 2856 notion of 'locus' at runtime for %L. */ 2857 else if (info.format_type == gcc_gfc_format_type) 2858 init_dynamic_gfc_info (); 2859 /* If this is one of the diagnostic attributes, then we have to 2860 initialize 'location_t' and 'tree' at runtime. */ 2861 else if (info.format_type == gcc_diag_format_type 2862 || info.format_type == gcc_tdiag_format_type 2863 || info.format_type == gcc_cdiag_format_type 2864 || info.format_type == gcc_cxxdiag_format_type) 2865 init_dynamic_diag_info (); 2866 else 2867 gcc_unreachable (); 2868 } 2869 2870 return NULL_TREE; 2871} 2872