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 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 2, 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 COPYING. If not, write to the Free 19Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2002110-1301, USA. */ 21 22/* $FreeBSD$ */ 23 24#include "config.h" 25#include "system.h" 26#include "coretypes.h" 27#include "tm.h" 28#include "tree.h" 29#include "flags.h" 30#include "c-common.h" 31#include "toplev.h" 32#include "intl.h" 33#include "diagnostic.h" 34#include "langhooks.h" 35#include "c-format.h" 36 37/* Set format warning options according to a -Wformat=n option. */ 38 39void 40set_Wformat (int setting) 41{ 42 warn_format = setting; 43 warn_format_extra_args = setting; 44 warn_format_zero_length = setting; 45 if (setting != 1) 46 { 47 warn_format_nonliteral = setting; 48 warn_format_security = setting; 49 warn_format_y2k = setting; 50 } 51 /* Make sure not to disable -Wnonnull if -Wformat=0 is specified. */ 52 if (setting) 53 warn_nonnull = setting; 54} 55 56 57/* Handle attributes associated with format checking. */ 58 59/* This must be in the same order as format_types, except for 60 format_type_error. Target-specific format types do not have 61 matching enum values. */ 62enum format_type { printf_format_type, asm_fprintf_format_type, 63 gcc_diag_format_type, gcc_tdiag_format_type, 64 gcc_cdiag_format_type, 65 gcc_cxxdiag_format_type, gcc_gfc_format_type, 66 scanf_format_type, strftime_format_type, 67 strfmon_format_type, format_type_error = -1}; 68 69typedef struct function_format_info 70{ 71 int format_type; /* type of format (printf, scanf, etc.) */ 72 unsigned HOST_WIDE_INT format_num; /* number of format argument */ 73 unsigned HOST_WIDE_INT first_arg_num; /* number of first arg (zero for varargs) */ 74} function_format_info; 75 76static bool decode_format_attr (tree, function_format_info *, int); 77static int decode_format_type (const char *); 78 79static bool check_format_string (tree argument, 80 unsigned HOST_WIDE_INT format_num, 81 int flags, bool *no_add_attrs); 82static bool get_constant (tree expr, unsigned HOST_WIDE_INT *value, 83 int validated_p); 84 85 86/* Handle a "format_arg" attribute; arguments as in 87 struct attribute_spec.handler. */ 88tree 89handle_format_arg_attribute (tree *node, tree ARG_UNUSED (name), 90 tree args, int flags, bool *no_add_attrs) 91{ 92 tree type = *node; 93 tree format_num_expr = TREE_VALUE (args); 94 unsigned HOST_WIDE_INT format_num = 0; 95 tree argument; 96 97 if (!get_constant (format_num_expr, &format_num, 0)) 98 { 99 error ("format string has invalid operand number"); 100 *no_add_attrs = true; 101 return NULL_TREE; 102 } 103 104 argument = TYPE_ARG_TYPES (type); 105 if (argument) 106 { 107 if (!check_format_string (argument, format_num, flags, no_add_attrs)) 108 return NULL_TREE; 109 } 110 111 if (TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE 112 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) 113 != char_type_node)) 114 { 115 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 116 error ("function does not return string type"); 117 *no_add_attrs = true; 118 return NULL_TREE; 119 } 120 121 return NULL_TREE; 122} 123 124/* Verify that the format_num argument is actually a string, in case 125 the format attribute is in error. */ 126static bool 127check_format_string (tree argument, unsigned HOST_WIDE_INT format_num, 128 int flags, bool *no_add_attrs) 129{ 130 unsigned HOST_WIDE_INT i; 131 132 for (i = 1; i != format_num; i++) 133 { 134 if (argument == 0) 135 break; 136 argument = TREE_CHAIN (argument); 137 } 138 139 if (!argument 140 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE 141 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument))) 142 != char_type_node)) 143 { 144 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 145 error ("format string argument not a string type"); 146 *no_add_attrs = true; 147 return false; 148 } 149 150 return true; 151} 152 153/* Verify EXPR is a constant, and store its value. 154 If validated_p is true there should be no errors. 155 Returns true on success, false otherwise. */ 156static bool 157get_constant (tree expr, unsigned HOST_WIDE_INT *value, int validated_p) 158{ 159 if (TREE_CODE (expr) != INTEGER_CST || TREE_INT_CST_HIGH (expr) != 0) 160 { 161 gcc_assert (!validated_p); 162 return false; 163 } 164 165 *value = TREE_INT_CST_LOW (expr); 166 167 return true; 168} 169 170/* Decode the arguments to a "format" attribute into a 171 function_format_info structure. It is already known that the list 172 is of the right length. If VALIDATED_P is true, then these 173 attributes have already been validated and must not be erroneous; 174 if false, it will give an error message. Returns true if the 175 attributes are successfully decoded, false otherwise. */ 176 177static bool 178decode_format_attr (tree args, function_format_info *info, int validated_p) 179{ 180 tree format_type_id = TREE_VALUE (args); 181 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args)); 182 tree first_arg_num_expr 183 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args))); 184 185 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE) 186 { 187 gcc_assert (!validated_p); 188 error ("%Junrecognized format specifier", lang_hooks.decls.getdecls ()); 189 return false; 190 } 191 else 192 { 193 const char *p = IDENTIFIER_POINTER (format_type_id); 194 195 info->format_type = decode_format_type (p); 196 197 if (info->format_type == format_type_error) 198 { 199 gcc_assert (!validated_p); 200 warning (OPT_Wformat, "%qE is an unrecognized format function type", 201 format_type_id); 202 return false; 203 } 204 } 205 206 if (!get_constant (format_num_expr, &info->format_num, validated_p)) 207 { 208 error ("format string has invalid operand number"); 209 return false; 210 } 211 212 if (!get_constant (first_arg_num_expr, &info->first_arg_num, validated_p)) 213 { 214 error ("%<...%> has invalid operand number"); 215 return false; 216 } 217 218 if (info->first_arg_num != 0 && info->first_arg_num <= info->format_num) 219 { 220 gcc_assert (!validated_p); 221 error ("format string argument follows the args to be formatted"); 222 return false; 223 } 224 225 return true; 226} 227 228/* Check a call to a format function against a parameter list. */ 229 230/* The C standard version C++ is treated as equivalent to 231 or inheriting from, for the purpose of format features supported. */ 232#define CPLUSPLUS_STD_VER STD_C94 233/* The C standard version we are checking formats against when pedantic. */ 234#define C_STD_VER ((int) (c_dialect_cxx () \ 235 ? CPLUSPLUS_STD_VER \ 236 : (flag_isoc99 \ 237 ? STD_C99 \ 238 : (flag_isoc94 ? STD_C94 : STD_C89)))) 239/* The name to give to the standard version we are warning about when 240 pedantic. FEATURE_VER is the version in which the feature warned out 241 appeared, which is higher than C_STD_VER. */ 242#define C_STD_NAME(FEATURE_VER) (c_dialect_cxx () \ 243 ? "ISO C++" \ 244 : ((FEATURE_VER) == STD_EXT \ 245 ? "ISO C" \ 246 : "ISO C90")) 247/* Adjust a C standard version, which may be STD_C9L, to account for 248 -Wno-long-long. Returns other standard versions unchanged. */ 249#define ADJ_STD(VER) ((int) ((VER) == STD_C9L \ 250 ? (warn_long_long ? STD_C99 : STD_C89) \ 251 : (VER))) 252 253/* Structure describing details of a type expected in format checking, 254 and the type to check against it. */ 255typedef struct format_wanted_type 256{ 257 /* The type wanted. */ 258 tree wanted_type; 259 /* The name of this type to use in diagnostics. */ 260 const char *wanted_type_name; 261 /* The level of indirection through pointers at which this type occurs. */ 262 int pointer_count; 263 /* Whether, when pointer_count is 1, to allow any character type when 264 pedantic, rather than just the character or void type specified. */ 265 int char_lenient_flag; 266 /* Whether the argument, dereferenced once, is written into and so the 267 argument must not be a pointer to a const-qualified type. */ 268 int writing_in_flag; 269 /* Whether the argument, dereferenced once, is read from and so 270 must not be a NULL pointer. */ 271 int reading_from_flag; 272 /* If warnings should be of the form "field precision should have 273 type 'int'", the name to use (in this case "field precision"), 274 otherwise NULL, for "format expects type 'long'" type 275 messages. */ 276 const char *name; 277 /* The actual parameter to check against the wanted type. */ 278 tree param; 279 /* The argument number of that parameter. */ 280 int arg_num; 281 /* The next type to check for this format conversion, or NULL if none. */ 282 struct format_wanted_type *next; 283} format_wanted_type; 284 285 286static const format_length_info printf_length_specs[] = 287{ 288 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 }, 289 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L }, 290 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 }, 291 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 }, 292 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 }, 293 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 }, 294 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 }, 295 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 }, 296 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 }, 297 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT }, 298 { NULL, 0, 0, NULL, 0, 0 } 299}; 300 301/* Length specifiers valid for asm_fprintf. */ 302static const format_length_info asm_fprintf_length_specs[] = 303{ 304 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 }, 305 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 }, 306 { NULL, 0, 0, NULL, 0, 0 } 307}; 308 309/* Length specifiers valid for GCC diagnostics. */ 310static const format_length_info gcc_diag_length_specs[] = 311{ 312 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C89 }, 313 { "w", FMT_LEN_none, STD_C89, NULL, 0, 0 }, 314 { NULL, 0, 0, NULL, 0, 0 } 315}; 316 317/* The custom diagnostics all accept the same length specifiers. */ 318#define gcc_tdiag_length_specs gcc_diag_length_specs 319#define gcc_cdiag_length_specs gcc_diag_length_specs 320#define gcc_cxxdiag_length_specs gcc_diag_length_specs 321 322/* This differs from printf_length_specs only in that "Z" is not accepted. */ 323static const format_length_info scanf_length_specs[] = 324{ 325 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 }, 326 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L }, 327 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 }, 328 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 }, 329 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 }, 330 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 }, 331 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 }, 332 { "H", FMT_LEN_H, STD_EXT, NULL, 0, 0 }, 333 { "D", FMT_LEN_D, STD_EXT, "DD", FMT_LEN_DD, STD_EXT }, 334 { NULL, 0, 0, NULL, 0, 0 } 335}; 336 337 338/* All tables for strfmon use STD_C89 everywhere, since -pedantic warnings 339 make no sense for a format type not part of any C standard version. */ 340static const format_length_info strfmon_length_specs[] = 341{ 342 /* A GNU extension. */ 343 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 }, 344 { NULL, 0, 0, NULL, 0, 0 } 345}; 346 347static const format_flag_spec printf_flag_specs[] = 348{ 349 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 }, 350 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 351 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 352 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 }, 353 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 }, 354 { '\'', 0, 0, N_("''' flag"), N_("the ''' printf flag"), STD_EXT }, 355 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' printf flag"), STD_EXT }, 356 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 }, 357 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 358 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 359 { 0, 0, 0, NULL, NULL, 0 } 360}; 361 362 363static const format_flag_pair printf_flag_pairs[] = 364{ 365 { ' ', '+', 1, 0 }, 366 { '0', '-', 1, 0 }, 367 { '0', 'p', 1, 'i' }, 368 { 0, 0, 0, 0 } 369}; 370 371static const format_flag_spec asm_fprintf_flag_specs[] = 372{ 373 { ' ', 0, 0, N_("' ' flag"), N_("the ' ' printf flag"), STD_C89 }, 374 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 375 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 376 { '0', 0, 0, N_("'0' flag"), N_("the '0' printf flag"), STD_C89 }, 377 { '-', 0, 0, N_("'-' flag"), N_("the '-' printf flag"), STD_C89 }, 378 { 'w', 0, 0, N_("field width"), N_("field width in printf format"), STD_C89 }, 379 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 380 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 381 { 0, 0, 0, NULL, NULL, 0 } 382}; 383 384static const format_flag_pair asm_fprintf_flag_pairs[] = 385{ 386 { ' ', '+', 1, 0 }, 387 { '0', '-', 1, 0 }, 388 { '0', 'p', 1, 'i' }, 389 { 0, 0, 0, 0 } 390}; 391 392static const format_flag_pair gcc_diag_flag_pairs[] = 393{ 394 { 0, 0, 0, 0 } 395}; 396 397#define gcc_tdiag_flag_pairs gcc_diag_flag_pairs 398#define gcc_cdiag_flag_pairs gcc_diag_flag_pairs 399#define gcc_cxxdiag_flag_pairs gcc_diag_flag_pairs 400 401static const format_flag_pair gcc_gfc_flag_pairs[] = 402{ 403 { 0, 0, 0, 0 } 404}; 405 406static const format_flag_spec gcc_diag_flag_specs[] = 407{ 408 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 409 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 }, 410 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 411 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 412 { 0, 0, 0, NULL, NULL, 0 } 413}; 414 415#define gcc_tdiag_flag_specs gcc_diag_flag_specs 416#define gcc_cdiag_flag_specs gcc_diag_flag_specs 417 418static const format_flag_spec gcc_cxxdiag_flag_specs[] = 419{ 420 { '+', 0, 0, N_("'+' flag"), N_("the '+' printf flag"), STD_C89 }, 421 { '#', 0, 0, N_("'#' flag"), N_("the '#' printf flag"), STD_C89 }, 422 { 'q', 0, 0, N_("'q' flag"), N_("the 'q' diagnostic flag"), STD_C89 }, 423 { 'p', 0, 0, N_("precision"), N_("precision in printf format"), STD_C89 }, 424 { 'L', 0, 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 }, 425 { 0, 0, 0, NULL, NULL, 0 } 426}; 427 428static const format_flag_spec scanf_flag_specs[] = 429{ 430 { '*', 0, 0, N_("assignment suppression"), N_("the assignment suppression scanf feature"), STD_C89 }, 431 { 'a', 0, 0, N_("'a' flag"), N_("the 'a' scanf flag"), STD_EXT }, 432 { 'w', 0, 0, N_("field width"), N_("field width in scanf format"), STD_C89 }, 433 { 'L', 0, 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 }, 434 { '\'', 0, 0, N_("''' flag"), N_("the ''' scanf flag"), STD_EXT }, 435 { 'I', 0, 0, N_("'I' flag"), N_("the 'I' scanf flag"), STD_EXT }, 436 { 0, 0, 0, NULL, NULL, 0 } 437}; 438 439 440static const format_flag_pair scanf_flag_pairs[] = 441{ 442 { '*', 'L', 0, 0 }, 443 { 0, 0, 0, 0 } 444}; 445 446 447static const format_flag_spec strftime_flag_specs[] = 448{ 449 { '_', 0, 0, N_("'_' flag"), N_("the '_' strftime flag"), STD_EXT }, 450 { '-', 0, 0, N_("'-' flag"), N_("the '-' strftime flag"), STD_EXT }, 451 { '0', 0, 0, N_("'0' flag"), N_("the '0' strftime flag"), STD_EXT }, 452 { '^', 0, 0, N_("'^' flag"), N_("the '^' strftime flag"), STD_EXT }, 453 { '#', 0, 0, N_("'#' flag"), N_("the '#' strftime flag"), STD_EXT }, 454 { 'w', 0, 0, N_("field width"), N_("field width in strftime format"), STD_EXT }, 455 { 'E', 0, 0, N_("'E' modifier"), N_("the 'E' strftime modifier"), STD_C99 }, 456 { 'O', 0, 0, N_("'O' modifier"), N_("the 'O' strftime modifier"), STD_C99 }, 457 { 'O', 'o', 0, NULL, N_("the 'O' modifier"), STD_EXT }, 458 { 0, 0, 0, NULL, NULL, 0 } 459}; 460 461 462static const format_flag_pair strftime_flag_pairs[] = 463{ 464 { 'E', 'O', 0, 0 }, 465 { '_', '-', 0, 0 }, 466 { '_', '0', 0, 0 }, 467 { '-', '0', 0, 0 }, 468 { '^', '#', 0, 0 }, 469 { 0, 0, 0, 0 } 470}; 471 472 473static const format_flag_spec strfmon_flag_specs[] = 474{ 475 { '=', 0, 1, N_("fill character"), N_("fill character in strfmon format"), STD_C89 }, 476 { '^', 0, 0, N_("'^' flag"), N_("the '^' strfmon flag"), STD_C89 }, 477 { '+', 0, 0, N_("'+' flag"), N_("the '+' strfmon flag"), STD_C89 }, 478 { '(', 0, 0, N_("'(' flag"), N_("the '(' strfmon flag"), STD_C89 }, 479 { '!', 0, 0, N_("'!' flag"), N_("the '!' strfmon flag"), STD_C89 }, 480 { '-', 0, 0, N_("'-' flag"), N_("the '-' strfmon flag"), STD_C89 }, 481 { 'w', 0, 0, N_("field width"), N_("field width in strfmon format"), STD_C89 }, 482 { '#', 0, 0, N_("left precision"), N_("left precision in strfmon format"), STD_C89 }, 483 { 'p', 0, 0, N_("right precision"), N_("right precision in strfmon format"), STD_C89 }, 484 { 'L', 0, 0, N_("length modifier"), N_("length modifier in strfmon format"), STD_C89 }, 485 { 0, 0, 0, NULL, NULL, 0 } 486}; 487 488static const format_flag_pair strfmon_flag_pairs[] = 489{ 490 { '+', '(', 0, 0 }, 491 { 0, 0, 0, 0 } 492}; 493 494 495static const format_char_info print_char_table[] = 496{ 497 /* C89 conversion specifiers. */ 498 { "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 }, 499 { "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 }, 500 { "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 }, 501 { "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 }, 502 { "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 }, 503 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 504 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL }, 505 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c", NULL }, 506 { "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 }, 507 /* C99 conversion specifiers. */ 508 { "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 }, 509 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "", NULL }, 510 /* X/Open conversion specifiers. */ 511 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 512 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "R", NULL }, 513 /* GNU conversion specifiers. */ 514 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", NULL }, 515 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 516}; 517 518static const format_char_info fbsd_ext_char_info = 519{ NULL, 1, STD_EXT, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL }; 520 521static const format_char_info fbsd_print_char_table[] = 522{ 523 /* BSD conversion specifiers. */ 524 /* FreeBSD kernel extensions (src/sys/kern/subr_prf.c). 525 The format %b is supported to decode error registers. 526 Its usage is: printf("reg=%b\n", regval, "<base><arg>*"); 527 which produces: reg=3<BITTWO,BITONE> 528 The format %D provides a hexdump given a pointer and separator string: 529 ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 530 ("%*D", len, ptr, " ") -> XX XX XX XX ... 531 */ 532 { "D", 1, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", &fbsd_ext_char_info }, 533 { "b", 0, STD_EXT, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "", &fbsd_ext_char_info }, 534 { "ry", 0, STD_EXT, { T89_I, BADLEN, BADLEN, T89_L, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "i", NULL }, 535 { NULL, 0, 0, NOLENGTHS, NULL, NULL } 536}; 537 538static const format_char_info asm_fprintf_char_table[] = 539{ 540 /* C89 conversion specifiers. */ 541 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0 +", "i", NULL }, 542 { "oxX", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0#", "i", NULL }, 543 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp0", "i", NULL }, 544 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "", NULL }, 545 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "cR", NULL }, 546 547 /* asm_fprintf conversion specifiers. */ 548 { "O", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 549 { "R", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 550 { "I", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 551 { "L", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 552 { "U", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 553 { "r", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 554 { "@", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 555 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 556}; 557 558static const format_char_info gcc_diag_char_table[] = 559{ 560 /* C89 conversion specifiers. */ 561 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 562 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 563 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 564 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 565 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 566 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 567 568 /* Custom conversion specifiers. */ 569 570 /* %H will require "location_t" at runtime. */ 571 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 572 573 /* These will require a "tree" at runtime. */ 574 { "J", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 575 576 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 577 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 578 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 579}; 580 581static const format_char_info gcc_tdiag_char_table[] = 582{ 583 /* C89 conversion specifiers. */ 584 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 585 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 586 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 587 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 588 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 589 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 590 591 /* Custom conversion specifiers. */ 592 593 /* %H will require "location_t" at runtime. */ 594 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 595 596 /* These will require a "tree" at runtime. */ 597 { "DFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 598 599 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 600 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 601 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 602}; 603 604static const format_char_info gcc_cdiag_char_table[] = 605{ 606 /* C89 conversion specifiers. */ 607 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 608 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 609 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 610 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 611 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 612 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 613 614 /* Custom conversion specifiers. */ 615 616 /* %H will require "location_t" at runtime. */ 617 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 618 619 /* These will require a "tree" at runtime. */ 620 { "DEFJT", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+", "", NULL }, 621 622 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 623 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 624 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 625}; 626 627static const format_char_info gcc_cxxdiag_char_table[] = 628{ 629 /* C89 conversion specifiers. */ 630 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, T89_L, T9L_LL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 631 { "ox", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 632 { "u", 0, STD_C89, { T89_UI, BADLEN, BADLEN, T89_UL, T9L_ULL, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 633 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 634 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "pq", "cR", NULL }, 635 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "c", NULL }, 636 637 /* Custom conversion specifiers. */ 638 639 /* %H will require "location_t" at runtime. */ 640 { "H", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 641 642 /* These will require a "tree" at runtime. */ 643 { "ADEFJTV",0,STD_C89,{ T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q+#", "", NULL }, 644 645 /* These accept either an 'int' or an 'enum tree_code' (which is handled as an 'int'.) */ 646 { "CLOPQ",0,STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "q", "", NULL }, 647 648 { "<>'", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 649 { "m", 0, STD_C89, NOARGUMENTS, "q", "", NULL }, 650 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 651}; 652 653static const format_char_info gcc_gfc_char_table[] = 654{ 655 /* C89 conversion specifiers. */ 656 { "di", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 657 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "", NULL }, 658 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "cR", NULL }, 659 660 /* gfc conversion specifiers. */ 661 662 { "C", 0, STD_C89, NOARGUMENTS, "", "", NULL }, 663 664 /* This will require a "locus" at runtime. */ 665 { "L", 0, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "", "R", NULL }, 666 667 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 668}; 669 670static const format_char_info scan_char_table[] = 671{ 672 /* C89 conversion specifiers. */ 673 { "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 }, 674 { "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 }, 675 { "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 }, 676 { "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 }, 677 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW", NULL }, 678 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW", NULL }, 679 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[", NULL }, 680 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL }, 681 { "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 }, 682 /* C99 conversion specifiers. */ 683 { "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 }, 684 { "aA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w'", "W", NULL }, 685 /* X/Open conversion specifiers. */ 686 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W", NULL }, 687 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W", NULL }, 688 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 689}; 690 691static const format_char_info time_char_table[] = 692{ 693 /* C89 conversion specifiers. */ 694 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "", NULL }, 695 { "cx", 0, STD_C89, NOLENGTHS, "E", "3", NULL }, 696 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "", NULL }, 697 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o", NULL }, 698 { "p", 0, STD_C89, NOLENGTHS, "#", "", NULL }, 699 { "X", 0, STD_C89, NOLENGTHS, "E", "", NULL }, 700 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4", NULL }, 701 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o", NULL }, 702 { "%", 0, STD_C89, NOLENGTHS, "", "", NULL }, 703 /* C99 conversion specifiers. */ 704 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o", NULL }, 705 { "D", 0, STD_C99, NOLENGTHS, "", "2", NULL }, 706 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "", NULL }, 707 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "", NULL }, 708 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o", NULL }, 709 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o", NULL }, 710 { "h", 0, STD_C99, NOLENGTHS, "^#", "", NULL }, 711 { "z", 0, STD_C99, NOLENGTHS, "O", "o", NULL }, 712 /* GNU conversion specifiers. */ 713 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "", NULL }, 714 { "P", 0, STD_EXT, NOLENGTHS, "", "", NULL }, 715 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 716}; 717 718static const format_char_info monetary_char_table[] = 719{ 720 { "in", 0, STD_C89, { T89_D, BADLEN, BADLEN, BADLEN, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "=^+(!-w#p", "", NULL }, 721 { NULL, 0, 0, NOLENGTHS, NULL, NULL, NULL } 722}; 723 724/* This must be in the same order as enum format_type. */ 725static const format_kind_info format_types_orig[] = 726{ 727 { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL, 728 printf_flag_specs, printf_flag_pairs, 729 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK, 730 'w', 0, 'p', 0, 'L', 731 &integer_type_node, &integer_type_node 732 }, 733 { "asm_fprintf", asm_fprintf_length_specs, asm_fprintf_char_table, " +#0-", NULL, 734 asm_fprintf_flag_specs, asm_fprintf_flag_pairs, 735 FMT_FLAG_ARG_CONVERT|FMT_FLAG_EMPTY_PREC_OK, 736 'w', 0, 'p', 0, 'L', 737 NULL, NULL 738 }, 739 { "gcc_diag", gcc_diag_length_specs, gcc_diag_char_table, "q+", NULL, 740 gcc_diag_flag_specs, gcc_diag_flag_pairs, 741 FMT_FLAG_ARG_CONVERT, 742 0, 0, 'p', 0, 'L', 743 NULL, &integer_type_node 744 }, 745 { "gcc_tdiag", gcc_tdiag_length_specs, gcc_tdiag_char_table, "q+", NULL, 746 gcc_tdiag_flag_specs, gcc_tdiag_flag_pairs, 747 FMT_FLAG_ARG_CONVERT, 748 0, 0, 'p', 0, 'L', 749 NULL, &integer_type_node 750 }, 751 { "gcc_cdiag", gcc_cdiag_length_specs, gcc_cdiag_char_table, "q+", NULL, 752 gcc_cdiag_flag_specs, gcc_cdiag_flag_pairs, 753 FMT_FLAG_ARG_CONVERT, 754 0, 0, 'p', 0, 'L', 755 NULL, &integer_type_node 756 }, 757 { "gcc_cxxdiag", gcc_cxxdiag_length_specs, gcc_cxxdiag_char_table, "q+#", NULL, 758 gcc_cxxdiag_flag_specs, gcc_cxxdiag_flag_pairs, 759 FMT_FLAG_ARG_CONVERT, 760 0, 0, 'p', 0, 'L', 761 NULL, &integer_type_node 762 }, 763 { "gcc_gfc", NULL, gcc_gfc_char_table, "", NULL, 764 NULL, gcc_gfc_flag_pairs, 765 FMT_FLAG_ARG_CONVERT, 766 0, 0, 0, 0, 0, 767 NULL, NULL 768 }, 769 { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL, 770 scanf_flag_specs, scanf_flag_pairs, 771 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_ZERO_WIDTH_BAD|FMT_FLAG_DOLLAR_GAP_POINTER_OK, 772 'w', 0, 0, '*', 'L', 773 NULL, NULL 774 }, 775 { "strftime", NULL, time_char_table, "_-0^#", "EO", 776 strftime_flag_specs, strftime_flag_pairs, 777 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0, 0, 778 NULL, NULL 779 }, 780 { "strfmon", strfmon_length_specs, monetary_char_table, "=^+(!-", NULL, 781 strfmon_flag_specs, strfmon_flag_pairs, 782 FMT_FLAG_ARG_CONVERT, 'w', '#', 'p', 0, 'L', 783 NULL, NULL 784 }, 785 { "printf0", printf_length_specs, print_char_table, " +#0-'I", NULL, 786 printf_flag_specs, printf_flag_pairs, 787 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE|FMT_FLAG_USE_DOLLAR|FMT_FLAG_EMPTY_PREC_OK|FMT_FLAG_NULL_FORMAT_OK, 788 'w', 0, 'p', 0, 'L', 789 &integer_type_node, &integer_type_node 790 } 791}; 792 793/* This layer of indirection allows GCC to reassign format_types with 794 new data if necessary, while still allowing the original data to be 795 const. */ 796static const format_kind_info *format_types = format_types_orig; 797/* We can modify this one. We also add target-specific format types 798 to the end of the array. */ 799static format_kind_info *dynamic_format_types; 800 801static int n_format_types = ARRAY_SIZE (format_types_orig); 802 803/* Structure detailing the results of checking a format function call 804 where the format expression may be a conditional expression with 805 many leaves resulting from nested conditional expressions. */ 806typedef struct 807{ 808 /* Number of leaves of the format argument that could not be checked 809 as they were not string literals. */ 810 int number_non_literal; 811 /* Number of leaves of the format argument that were null pointers or 812 string literals, but had extra format arguments. */ 813 int number_extra_args; 814 /* Number of leaves of the format argument that were null pointers or 815 string literals, but had extra format arguments and used $ operand 816 numbers. */ 817 int number_dollar_extra_args; 818 /* Number of leaves of the format argument that were wide string 819 literals. */ 820 int number_wide; 821 /* Number of leaves of the format argument that were empty strings. */ 822 int number_empty; 823 /* Number of leaves of the format argument that were unterminated 824 strings. */ 825 int number_unterminated; 826 /* Number of leaves of the format argument that were not counted above. */ 827 int number_other; 828} format_check_results; 829 830typedef struct 831{ 832 format_check_results *res; 833 function_format_info *info; 834 tree params; 835} format_check_context; 836 837static void check_format_info (function_format_info *, tree); 838static void check_format_arg (void *, tree, unsigned HOST_WIDE_INT); 839static void check_format_info_main (format_check_results *, 840 function_format_info *, 841 const char *, int, tree, 842 unsigned HOST_WIDE_INT); 843 844static void init_dollar_format_checking (int, tree); 845static int maybe_read_dollar_number (const char **, int, 846 tree, tree *, const format_kind_info *); 847static bool avoid_dollar_number (const char *); 848static void finish_dollar_format_checking (format_check_results *, int); 849 850static const format_flag_spec *get_flag_spec (const format_flag_spec *, 851 int, const char *); 852 853static void check_format_types (format_wanted_type *, const char *, int); 854static void format_type_warning (const char *, const char *, int, tree, 855 int, const char *, tree, int); 856 857/* Decode a format type from a string, returning the type, or 858 format_type_error if not valid, in which case the caller should print an 859 error message. */ 860static int 861decode_format_type (const char *s) 862{ 863 int i; 864 int slen; 865 slen = strlen (s); 866 for (i = 0; i < n_format_types; i++) 867 { 868 int alen; 869 if (!strcmp (s, format_types[i].name)) 870 return i; 871 alen = strlen (format_types[i].name); 872 if (slen == alen + 4 && s[0] == '_' && s[1] == '_' 873 && s[slen - 1] == '_' && s[slen - 2] == '_' 874 && !strncmp (s + 2, format_types[i].name, alen)) 875 return i; 876 } 877 return format_type_error; 878} 879 880 881/* Check the argument list of a call to printf, scanf, etc. 882 ATTRS are the attributes on the function type. 883 PARAMS is the list of argument values. Also, if -Wmissing-format-attribute, 884 warn for calls to vprintf or vscanf in functions with no such format 885 attribute themselves. */ 886 887void 888check_function_format (tree attrs, tree params) 889{ 890 tree a; 891 892 /* See if this function has any format attributes. */ 893 for (a = attrs; a; a = TREE_CHAIN (a)) 894 { 895 if (is_attribute_p ("format", TREE_PURPOSE (a))) 896 { 897 /* Yup; check it. */ 898 function_format_info info; 899 decode_format_attr (TREE_VALUE (a), &info, 1); 900 if (warn_format) 901 check_format_info (&info, params); 902 if (warn_missing_format_attribute && info.first_arg_num == 0 903 && (format_types[info.format_type].flags 904 & (int) FMT_FLAG_ARG_CONVERT)) 905 { 906 tree c; 907 for (c = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl)); 908 c; 909 c = TREE_CHAIN (c)) 910 if (is_attribute_p ("format", TREE_PURPOSE (c)) 911 && (decode_format_type (IDENTIFIER_POINTER 912 (TREE_VALUE (TREE_VALUE (c)))) 913 == info.format_type)) 914 break; 915 if (c == NULL_TREE) 916 { 917 /* Check if the current function has a parameter to which 918 the format attribute could be attached; if not, it 919 can't be a candidate for a format attribute, despite 920 the vprintf-like or vscanf-like call. */ 921 tree args; 922 for (args = DECL_ARGUMENTS (current_function_decl); 923 args != 0; 924 args = TREE_CHAIN (args)) 925 { 926 if (TREE_CODE (TREE_TYPE (args)) == POINTER_TYPE 927 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (args))) 928 == char_type_node)) 929 break; 930 } 931 if (args != 0) 932 warning (OPT_Wmissing_format_attribute, "function might " 933 "be possible candidate for %qs format attribute", 934 format_types[info.format_type].name); 935 } 936 } 937 } 938 } 939} 940 941 942/* Variables used by the checking of $ operand number formats. */ 943static char *dollar_arguments_used = NULL; 944static char *dollar_arguments_pointer_p = NULL; 945static int dollar_arguments_alloc = 0; 946static int dollar_arguments_count; 947static int dollar_first_arg_num; 948static int dollar_max_arg_used; 949static int dollar_format_warned; 950 951/* Initialize the checking for a format string that may contain $ 952 parameter number specifications; we will need to keep track of whether 953 each parameter has been used. FIRST_ARG_NUM is the number of the first 954 argument that is a parameter to the format, or 0 for a vprintf-style 955 function; PARAMS is the list of arguments starting at this argument. */ 956 957static void 958init_dollar_format_checking (int first_arg_num, tree params) 959{ 960 tree oparams = params; 961 962 dollar_first_arg_num = first_arg_num; 963 dollar_arguments_count = 0; 964 dollar_max_arg_used = 0; 965 dollar_format_warned = 0; 966 if (first_arg_num > 0) 967 { 968 while (params) 969 { 970 dollar_arguments_count++; 971 params = TREE_CHAIN (params); 972 } 973 } 974 if (dollar_arguments_alloc < dollar_arguments_count) 975 { 976 if (dollar_arguments_used) 977 free (dollar_arguments_used); 978 if (dollar_arguments_pointer_p) 979 free (dollar_arguments_pointer_p); 980 dollar_arguments_alloc = dollar_arguments_count; 981 dollar_arguments_used = XNEWVEC (char, dollar_arguments_alloc); 982 dollar_arguments_pointer_p = XNEWVEC (char, dollar_arguments_alloc); 983 } 984 if (dollar_arguments_alloc) 985 { 986 memset (dollar_arguments_used, 0, dollar_arguments_alloc); 987 if (first_arg_num > 0) 988 { 989 int i = 0; 990 params = oparams; 991 while (params) 992 { 993 dollar_arguments_pointer_p[i] = (TREE_CODE (TREE_TYPE (TREE_VALUE (params))) 994 == POINTER_TYPE); 995 params = TREE_CHAIN (params); 996 i++; 997 } 998 } 999 } 1000} 1001 1002 1003/* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED 1004 is set, it is an error if one is not found; otherwise, it is OK. If 1005 such a number is found, check whether it is within range and mark that 1006 numbered operand as being used for later checking. Returns the operand 1007 number if found and within range, zero if no such number was found and 1008 this is OK, or -1 on error. PARAMS points to the first operand of the 1009 format; PARAM_PTR is made to point to the parameter referred to. If 1010 a $ format is found, *FORMAT is updated to point just after it. */ 1011 1012static int 1013maybe_read_dollar_number (const char **format, 1014 int dollar_needed, tree params, tree *param_ptr, 1015 const format_kind_info *fki) 1016{ 1017 int argnum; 1018 int overflow_flag; 1019 const char *fcp = *format; 1020 if (!ISDIGIT (*fcp)) 1021 { 1022 if (dollar_needed) 1023 { 1024 warning (OPT_Wformat, "missing $ operand number in format"); 1025 return -1; 1026 } 1027 else 1028 return 0; 1029 } 1030 argnum = 0; 1031 overflow_flag = 0; 1032 while (ISDIGIT (*fcp)) 1033 { 1034 int nargnum; 1035 nargnum = 10 * argnum + (*fcp - '0'); 1036 if (nargnum < 0 || nargnum / 10 != argnum) 1037 overflow_flag = 1; 1038 argnum = nargnum; 1039 fcp++; 1040 } 1041 if (*fcp != '$') 1042 { 1043 if (dollar_needed) 1044 { 1045 warning (OPT_Wformat, "missing $ operand number in format"); 1046 return -1; 1047 } 1048 else 1049 return 0; 1050 } 1051 *format = fcp + 1; 1052 if (pedantic && !dollar_format_warned) 1053 { 1054 warning (OPT_Wformat, "%s does not support %%n$ operand number formats", 1055 C_STD_NAME (STD_EXT)); 1056 dollar_format_warned = 1; 1057 } 1058 if (overflow_flag || argnum == 0 1059 || (dollar_first_arg_num && argnum > dollar_arguments_count)) 1060 { 1061 warning (OPT_Wformat, "operand number out of range in format"); 1062 return -1; 1063 } 1064 if (argnum > dollar_max_arg_used) 1065 dollar_max_arg_used = argnum; 1066 /* For vprintf-style functions we may need to allocate more memory to 1067 track which arguments are used. */ 1068 while (dollar_arguments_alloc < dollar_max_arg_used) 1069 { 1070 int nalloc; 1071 nalloc = 2 * dollar_arguments_alloc + 16; 1072 dollar_arguments_used = XRESIZEVEC (char, dollar_arguments_used, 1073 nalloc); 1074 dollar_arguments_pointer_p = XRESIZEVEC (char, dollar_arguments_pointer_p, 1075 nalloc); 1076 memset (dollar_arguments_used + dollar_arguments_alloc, 0, 1077 nalloc - dollar_arguments_alloc); 1078 dollar_arguments_alloc = nalloc; 1079 } 1080 if (!(fki->flags & (int) FMT_FLAG_DOLLAR_MULTIPLE) 1081 && dollar_arguments_used[argnum - 1] == 1) 1082 { 1083 dollar_arguments_used[argnum - 1] = 2; 1084 warning (OPT_Wformat, "format argument %d used more than once in %s format", 1085 argnum, fki->name); 1086 } 1087 else 1088 dollar_arguments_used[argnum - 1] = 1; 1089 if (dollar_first_arg_num) 1090 { 1091 int i; 1092 *param_ptr = params; 1093 for (i = 1; i < argnum && *param_ptr != 0; i++) 1094 *param_ptr = TREE_CHAIN (*param_ptr); 1095 1096 /* This case shouldn't be caught here. */ 1097 gcc_assert (*param_ptr); 1098 } 1099 else 1100 *param_ptr = 0; 1101 return argnum; 1102} 1103 1104/* Ensure that FORMAT does not start with a decimal number followed by 1105 a $; give a diagnostic and return true if it does, false otherwise. */ 1106 1107static bool 1108avoid_dollar_number (const char *format) 1109{ 1110 if (!ISDIGIT (*format)) 1111 return false; 1112 while (ISDIGIT (*format)) 1113 format++; 1114 if (*format == '$') 1115 { 1116 warning (OPT_Wformat, "$ operand number used after format without operand number"); 1117 return true; 1118 } 1119 return false; 1120} 1121 1122 1123/* Finish the checking for a format string that used $ operand number formats 1124 instead of non-$ formats. We check for unused operands before used ones 1125 (a serious error, since the implementation of the format function 1126 can't know what types to pass to va_arg to find the later arguments). 1127 and for unused operands at the end of the format (if we know how many 1128 arguments the format had, so not for vprintf). If there were operand 1129 numbers out of range on a non-vprintf-style format, we won't have reached 1130 here. If POINTER_GAP_OK, unused arguments are OK if all arguments are 1131 pointers. */ 1132 1133static void 1134finish_dollar_format_checking (format_check_results *res, int pointer_gap_ok) 1135{ 1136 int i; 1137 bool found_pointer_gap = false; 1138 for (i = 0; i < dollar_max_arg_used; i++) 1139 { 1140 if (!dollar_arguments_used[i]) 1141 { 1142 if (pointer_gap_ok && (dollar_first_arg_num == 0 1143 || dollar_arguments_pointer_p[i])) 1144 found_pointer_gap = true; 1145 else 1146 warning (OPT_Wformat, 1147 "format argument %d unused before used argument %d in $-style format", 1148 i + 1, dollar_max_arg_used); 1149 } 1150 } 1151 if (found_pointer_gap 1152 || (dollar_first_arg_num 1153 && dollar_max_arg_used < dollar_arguments_count)) 1154 { 1155 res->number_other--; 1156 res->number_dollar_extra_args++; 1157 } 1158} 1159 1160 1161/* Retrieve the specification for a format flag. SPEC contains the 1162 specifications for format flags for the applicable kind of format. 1163 FLAG is the flag in question. If PREDICATES is NULL, the basic 1164 spec for that flag must be retrieved and must exist. If 1165 PREDICATES is not NULL, it is a string listing possible predicates 1166 for the spec entry; if an entry predicated on any of these is 1167 found, it is returned, otherwise NULL is returned. */ 1168 1169static const format_flag_spec * 1170get_flag_spec (const format_flag_spec *spec, int flag, const char *predicates) 1171{ 1172 int i; 1173 for (i = 0; spec[i].flag_char != 0; i++) 1174 { 1175 if (spec[i].flag_char != flag) 1176 continue; 1177 if (predicates != NULL) 1178 { 1179 if (spec[i].predicate != 0 1180 && strchr (predicates, spec[i].predicate) != 0) 1181 return &spec[i]; 1182 } 1183 else if (spec[i].predicate == 0) 1184 return &spec[i]; 1185 } 1186 gcc_assert (predicates); 1187 return NULL; 1188} 1189 1190 1191/* Check the argument list of a call to printf, scanf, etc. 1192 INFO points to the function_format_info structure. 1193 PARAMS is the list of argument values. */ 1194 1195static void 1196check_format_info (function_format_info *info, tree params) 1197{ 1198 format_check_context format_ctx; 1199 unsigned HOST_WIDE_INT arg_num; 1200 tree format_tree; 1201 format_check_results res; 1202 /* Skip to format argument. If the argument isn't available, there's 1203 no work for us to do; prototype checking will catch the problem. */ 1204 for (arg_num = 1; ; ++arg_num) 1205 { 1206 if (params == 0) 1207 return; 1208 if (arg_num == info->format_num) 1209 break; 1210 params = TREE_CHAIN (params); 1211 } 1212 format_tree = TREE_VALUE (params); 1213 params = TREE_CHAIN (params); 1214 if (format_tree == 0) 1215 return; 1216 1217 res.number_non_literal = 0; 1218 res.number_extra_args = 0; 1219 res.number_dollar_extra_args = 0; 1220 res.number_wide = 0; 1221 res.number_empty = 0; 1222 res.number_unterminated = 0; 1223 res.number_other = 0; 1224 1225 format_ctx.res = &res; 1226 format_ctx.info = info; 1227 format_ctx.params = params; 1228 1229 check_function_arguments_recurse (check_format_arg, &format_ctx, 1230 format_tree, arg_num); 1231 1232 if (res.number_non_literal > 0) 1233 { 1234 /* Functions taking a va_list normally pass a non-literal format 1235 string. These functions typically are declared with 1236 first_arg_num == 0, so avoid warning in those cases. */ 1237 if (!(format_types[info->format_type].flags & (int) FMT_FLAG_ARG_CONVERT)) 1238 { 1239 /* For strftime-like formats, warn for not checking the format 1240 string; but there are no arguments to check. */ 1241 warning (OPT_Wformat_nonliteral, 1242 "format not a string literal, format string not checked"); 1243 } 1244 else if (info->first_arg_num != 0) 1245 { 1246 /* If there are no arguments for the format at all, we may have 1247 printf (foo) which is likely to be a security hole. */ 1248 while (arg_num + 1 < info->first_arg_num) 1249 { 1250 if (params == 0) 1251 break; 1252 params = TREE_CHAIN (params); 1253 ++arg_num; 1254 } 1255 if (params == 0 && warn_format_security) 1256 warning (OPT_Wformat_security, 1257 "format not a string literal and no format arguments"); 1258 else if (params == 0 && warn_format_nonliteral) 1259 warning (OPT_Wformat_nonliteral, 1260 "format not a string literal and no format arguments"); 1261 else 1262 warning (OPT_Wformat_nonliteral, 1263 "format not a string literal, argument types not checked"); 1264 } 1265 } 1266 1267 /* If there were extra arguments to the format, normally warn. However, 1268 the standard does say extra arguments are ignored, so in the specific 1269 case where we have multiple leaves (conditional expressions or 1270 ngettext) allow extra arguments if at least one leaf didn't have extra 1271 arguments, but was otherwise OK (either non-literal or checked OK). 1272 If the format is an empty string, this should be counted similarly to the 1273 case of extra format arguments. */ 1274 if (res.number_extra_args > 0 && res.number_non_literal == 0 1275 && res.number_other == 0) 1276 warning (OPT_Wformat_extra_args, "too many arguments for format"); 1277 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0 1278 && res.number_other == 0) 1279 warning (OPT_Wformat_extra_args, "unused arguments in $-style format"); 1280 if (res.number_empty > 0 && res.number_non_literal == 0 1281 && res.number_other == 0) 1282 warning (OPT_Wformat_zero_length, "zero-length %s format string", 1283 format_types[info->format_type].name); 1284 1285 if (res.number_wide > 0) 1286 warning (OPT_Wformat, "format is a wide character string"); 1287 1288 if (res.number_unterminated > 0) 1289 warning (OPT_Wformat, "unterminated format string"); 1290} 1291 1292/* Callback from check_function_arguments_recurse to check a 1293 format string. FORMAT_TREE is the format parameter. ARG_NUM 1294 is the number of the format argument. CTX points to a 1295 format_check_context. */ 1296 1297static void 1298check_format_arg (void *ctx, tree format_tree, 1299 unsigned HOST_WIDE_INT arg_num) 1300{ 1301 format_check_context *format_ctx = (format_check_context *) ctx; 1302 format_check_results *res = format_ctx->res; 1303 function_format_info *info = format_ctx->info; 1304 tree params = format_ctx->params; 1305 1306 int format_length; 1307 HOST_WIDE_INT offset; 1308 const char *format_chars; 1309 tree array_size = 0; 1310 tree array_init; 1311 1312 if (integer_zerop (format_tree)) 1313 { 1314 /* FIXME: this warning should go away once Marc Espie's 1315 __attribute__((nonnull)) patch is in. Instead, checking for 1316 nonnull attributes should probably change this function to act 1317 specially if info == NULL and add a res->number_null entry for 1318 that case, or maybe add a function pointer to be called at 1319 the end instead of hardcoding check_format_info_main. */ 1320 if (!(format_types[info->format_type].flags & FMT_FLAG_NULL_FORMAT_OK)) 1321 warning (OPT_Wformat, "null format string"); 1322 1323 /* Skip to first argument to check, so we can see if this format 1324 has any arguments (it shouldn't). */ 1325 while (arg_num + 1 < info->first_arg_num) 1326 { 1327 if (params == 0) 1328 return; 1329 params = TREE_CHAIN (params); 1330 ++arg_num; 1331 } 1332 1333 if (params == 0) 1334 res->number_other++; 1335 else 1336 res->number_extra_args++; 1337 1338 return; 1339 } 1340 1341 offset = 0; 1342 if (TREE_CODE (format_tree) == PLUS_EXPR) 1343 { 1344 tree arg0, arg1; 1345 1346 arg0 = TREE_OPERAND (format_tree, 0); 1347 arg1 = TREE_OPERAND (format_tree, 1); 1348 STRIP_NOPS (arg0); 1349 STRIP_NOPS (arg1); 1350 if (TREE_CODE (arg1) == INTEGER_CST) 1351 format_tree = arg0; 1352 else if (TREE_CODE (arg0) == INTEGER_CST) 1353 { 1354 format_tree = arg1; 1355 arg1 = arg0; 1356 } 1357 else 1358 { 1359 res->number_non_literal++; 1360 return; 1361 } 1362 if (!host_integerp (arg1, 0) 1363 || (offset = tree_low_cst (arg1, 0)) < 0) 1364 { 1365 res->number_non_literal++; 1366 return; 1367 } 1368 } 1369 if (TREE_CODE (format_tree) != ADDR_EXPR) 1370 { 1371 res->number_non_literal++; 1372 return; 1373 } 1374 format_tree = TREE_OPERAND (format_tree, 0); 1375 if (TREE_CODE (format_tree) == ARRAY_REF 1376 && host_integerp (TREE_OPERAND (format_tree, 1), 0) 1377 && (offset += tree_low_cst (TREE_OPERAND (format_tree, 1), 0)) >= 0) 1378 format_tree = TREE_OPERAND (format_tree, 0); 1379 if (TREE_CODE (format_tree) == VAR_DECL 1380 && TREE_CODE (TREE_TYPE (format_tree)) == ARRAY_TYPE 1381 && (array_init = decl_constant_value (format_tree)) != format_tree 1382 && TREE_CODE (array_init) == STRING_CST) 1383 { 1384 /* Extract the string constant initializer. Note that this may include 1385 a trailing NUL character that is not in the array (e.g. 1386 const char a[3] = "foo";). */ 1387 array_size = DECL_SIZE_UNIT (format_tree); 1388 format_tree = array_init; 1389 } 1390 if (TREE_CODE (format_tree) != STRING_CST) 1391 { 1392 res->number_non_literal++; 1393 return; 1394 } 1395 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node) 1396 { 1397 res->number_wide++; 1398 return; 1399 } 1400 format_chars = TREE_STRING_POINTER (format_tree); 1401 format_length = TREE_STRING_LENGTH (format_tree); 1402 if (array_size != 0) 1403 { 1404 /* Variable length arrays can't be initialized. */ 1405 gcc_assert (TREE_CODE (array_size) == INTEGER_CST); 1406 1407 if (host_integerp (array_size, 0)) 1408 { 1409 HOST_WIDE_INT array_size_value = TREE_INT_CST_LOW (array_size); 1410 if (array_size_value > 0 1411 && array_size_value == (int) array_size_value 1412 && format_length > array_size_value) 1413 format_length = array_size_value; 1414 } 1415 } 1416 if (offset) 1417 { 1418 if (offset >= format_length) 1419 { 1420 res->number_non_literal++; 1421 return; 1422 } 1423 format_chars += offset; 1424 format_length -= offset; 1425 } 1426 if (format_length < 1) 1427 { 1428 res->number_unterminated++; 1429 return; 1430 } 1431 if (format_length == 1) 1432 { 1433 res->number_empty++; 1434 return; 1435 } 1436 if (format_chars[--format_length] != 0) 1437 { 1438 res->number_unterminated++; 1439 return; 1440 } 1441 1442 /* Skip to first argument to check. */ 1443 while (arg_num + 1 < info->first_arg_num) 1444 { 1445 if (params == 0) 1446 return; 1447 params = TREE_CHAIN (params); 1448 ++arg_num; 1449 } 1450 /* Provisionally increment res->number_other; check_format_info_main 1451 will decrement it if it finds there are extra arguments, but this way 1452 need not adjust it for every return. */ 1453 res->number_other++; 1454 check_format_info_main (res, info, format_chars, format_length, 1455 params, arg_num); 1456} 1457 1458 1459/* Do the main part of checking a call to a format function. FORMAT_CHARS 1460 is the NUL-terminated format string (which at this point may contain 1461 internal NUL characters); FORMAT_LENGTH is its length (excluding the 1462 terminating NUL character). ARG_NUM is one less than the number of 1463 the first format argument to check; PARAMS points to that format 1464 argument in the list of arguments. */ 1465 1466static void 1467check_format_info_main (format_check_results *res, 1468 function_format_info *info, const char *format_chars, 1469 int format_length, tree params, 1470 unsigned HOST_WIDE_INT arg_num) 1471{ 1472 const char *orig_format_chars = format_chars; 1473 tree first_fillin_param = params; 1474 1475 const format_kind_info *fki = &format_types[info->format_type]; 1476 const format_flag_spec *flag_specs = fki->flag_specs; 1477 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs; 1478 1479 /* -1 if no conversions taking an operand have been found; 0 if one has 1480 and it didn't use $; 1 if $ formats are in use. */ 1481 int has_operand_number = -1; 1482 1483 init_dollar_format_checking (info->first_arg_num, first_fillin_param); 1484 1485 while (1) 1486 { 1487 int i; 1488 int suppressed = FALSE; 1489 const char *length_chars = NULL; 1490 enum format_lengths length_chars_val = FMT_LEN_none; 1491 enum format_std_version length_chars_std = STD_C89; 1492 int format_char; 1493 tree cur_param; 1494 tree wanted_type; 1495 int main_arg_num = 0; 1496 tree main_arg_params = 0; 1497 enum format_std_version wanted_type_std; 1498 const char *wanted_type_name; 1499 format_wanted_type width_wanted_type; 1500 format_wanted_type precision_wanted_type; 1501 format_wanted_type main_wanted_type; 1502 format_wanted_type *first_wanted_type = NULL; 1503 format_wanted_type *last_wanted_type = NULL; 1504 const format_length_info *fli = NULL; 1505 const format_char_info *fci = NULL; 1506 char flag_chars[256]; 1507 int aflag = 0; 1508 const char *format_start = format_chars; 1509 if (*format_chars == 0) 1510 { 1511 if (format_chars - orig_format_chars != format_length) 1512 warning (OPT_Wformat, "embedded %<\\0%> in format"); 1513 if (info->first_arg_num != 0 && params != 0 1514 && has_operand_number <= 0) 1515 { 1516 res->number_other--; 1517 res->number_extra_args++; 1518 } 1519 if (has_operand_number > 0) 1520 finish_dollar_format_checking (res, fki->flags & (int) FMT_FLAG_DOLLAR_GAP_POINTER_OK); 1521 return; 1522 } 1523 if (*format_chars++ != '%') 1524 continue; 1525 if (*format_chars == 0) 1526 { 1527 warning (OPT_Wformat, "spurious trailing %<%%%> in format"); 1528 continue; 1529 } 1530 if (*format_chars == '%') 1531 { 1532 ++format_chars; 1533 continue; 1534 } 1535 flag_chars[0] = 0; 1536 1537 if ((fki->flags & (int) FMT_FLAG_USE_DOLLAR) && has_operand_number != 0) 1538 { 1539 /* Possibly read a $ operand number at the start of the format. 1540 If one was previously used, one is required here. If one 1541 is not used here, we can't immediately conclude this is a 1542 format without them, since it could be printf %m or scanf %*. */ 1543 int opnum; 1544 opnum = maybe_read_dollar_number (&format_chars, 0, 1545 first_fillin_param, 1546 &main_arg_params, fki); 1547 if (opnum == -1) 1548 return; 1549 else if (opnum > 0) 1550 { 1551 has_operand_number = 1; 1552 main_arg_num = opnum + info->first_arg_num - 1; 1553 } 1554 } 1555 else if (fki->flags & FMT_FLAG_USE_DOLLAR) 1556 { 1557 if (avoid_dollar_number (format_chars)) 1558 return; 1559 } 1560 1561 /* Read any format flags, but do not yet validate them beyond removing 1562 duplicates, since in general validation depends on the rest of 1563 the format. */ 1564 while (*format_chars != 0 1565 && strchr (fki->flag_chars, *format_chars) != 0) 1566 { 1567 const format_flag_spec *s = get_flag_spec (flag_specs, 1568 *format_chars, NULL); 1569 if (strchr (flag_chars, *format_chars) != 0) 1570 { 1571 warning (OPT_Wformat, "repeated %s in format", _(s->name)); 1572 } 1573 else 1574 { 1575 i = strlen (flag_chars); 1576 flag_chars[i++] = *format_chars; 1577 flag_chars[i] = 0; 1578 } 1579 if (s->skip_next_char) 1580 { 1581 ++format_chars; 1582 if (*format_chars == 0) 1583 { 1584 warning (OPT_Wformat, "missing fill character at end of strfmon format"); 1585 return; 1586 } 1587 } 1588 ++format_chars; 1589 } 1590 1591 /* Read any format width, possibly * or *m$. */ 1592 if (fki->width_char != 0) 1593 { 1594 if (fki->width_type != NULL && *format_chars == '*') 1595 { 1596 i = strlen (flag_chars); 1597 flag_chars[i++] = fki->width_char; 1598 flag_chars[i] = 0; 1599 /* "...a field width...may be indicated by an asterisk. 1600 In this case, an int argument supplies the field width..." */ 1601 ++format_chars; 1602 if (has_operand_number != 0) 1603 { 1604 int opnum; 1605 opnum = maybe_read_dollar_number (&format_chars, 1606 has_operand_number == 1, 1607 first_fillin_param, 1608 ¶ms, fki); 1609 if (opnum == -1) 1610 return; 1611 else if (opnum > 0) 1612 { 1613 has_operand_number = 1; 1614 arg_num = opnum + info->first_arg_num - 1; 1615 } 1616 else 1617 has_operand_number = 0; 1618 } 1619 else 1620 { 1621 if (avoid_dollar_number (format_chars)) 1622 return; 1623 } 1624 if (info->first_arg_num != 0) 1625 { 1626 if (params == 0) 1627 { 1628 warning (OPT_Wformat, "too few arguments for format"); 1629 return; 1630 } 1631 cur_param = TREE_VALUE (params); 1632 if (has_operand_number <= 0) 1633 { 1634 params = TREE_CHAIN (params); 1635 ++arg_num; 1636 } 1637 width_wanted_type.wanted_type = *fki->width_type; 1638 width_wanted_type.wanted_type_name = NULL; 1639 width_wanted_type.pointer_count = 0; 1640 width_wanted_type.char_lenient_flag = 0; 1641 width_wanted_type.writing_in_flag = 0; 1642 width_wanted_type.reading_from_flag = 0; 1643 width_wanted_type.name = _("field width"); 1644 width_wanted_type.param = cur_param; 1645 width_wanted_type.arg_num = arg_num; 1646 width_wanted_type.next = NULL; 1647 if (last_wanted_type != 0) 1648 last_wanted_type->next = &width_wanted_type; 1649 if (first_wanted_type == 0) 1650 first_wanted_type = &width_wanted_type; 1651 last_wanted_type = &width_wanted_type; 1652 } 1653 } 1654 else 1655 { 1656 /* Possibly read a numeric width. If the width is zero, 1657 we complain if appropriate. */ 1658 int non_zero_width_char = FALSE; 1659 int found_width = FALSE; 1660 while (ISDIGIT (*format_chars)) 1661 { 1662 found_width = TRUE; 1663 if (*format_chars != '0') 1664 non_zero_width_char = TRUE; 1665 ++format_chars; 1666 } 1667 if (found_width && !non_zero_width_char && 1668 (fki->flags & (int) FMT_FLAG_ZERO_WIDTH_BAD)) 1669 warning (OPT_Wformat, "zero width in %s format", fki->name); 1670 if (found_width) 1671 { 1672 i = strlen (flag_chars); 1673 flag_chars[i++] = fki->width_char; 1674 flag_chars[i] = 0; 1675 } 1676 } 1677 } 1678 1679 /* Read any format left precision (must be a number, not *). */ 1680 if (fki->left_precision_char != 0 && *format_chars == '#') 1681 { 1682 ++format_chars; 1683 i = strlen (flag_chars); 1684 flag_chars[i++] = fki->left_precision_char; 1685 flag_chars[i] = 0; 1686 if (!ISDIGIT (*format_chars)) 1687 warning (OPT_Wformat, "empty left precision in %s format", fki->name); 1688 while (ISDIGIT (*format_chars)) 1689 ++format_chars; 1690 } 1691 1692 /* Read any format precision, possibly * or *m$. */ 1693 if (fki->precision_char != 0 && *format_chars == '.') 1694 { 1695 ++format_chars; 1696 i = strlen (flag_chars); 1697 flag_chars[i++] = fki->precision_char; 1698 flag_chars[i] = 0; 1699 if (fki->precision_type != NULL && *format_chars == '*') 1700 { 1701 /* "...a...precision...may be indicated by an asterisk. 1702 In this case, an int argument supplies the...precision." */ 1703 ++format_chars; 1704 if (has_operand_number != 0) 1705 { 1706 int opnum; 1707 opnum = maybe_read_dollar_number (&format_chars, 1708 has_operand_number == 1, 1709 first_fillin_param, 1710 ¶ms, fki); 1711 if (opnum == -1) 1712 return; 1713 else if (opnum > 0) 1714 { 1715 has_operand_number = 1; 1716 arg_num = opnum + info->first_arg_num - 1; 1717 } 1718 else 1719 has_operand_number = 0; 1720 } 1721 else 1722 { 1723 if (avoid_dollar_number (format_chars)) 1724 return; 1725 } 1726 if (info->first_arg_num != 0) 1727 { 1728 if (params == 0) 1729 { 1730 warning (OPT_Wformat, "too few arguments for format"); 1731 return; 1732 } 1733 cur_param = TREE_VALUE (params); 1734 if (has_operand_number <= 0) 1735 { 1736 params = TREE_CHAIN (params); 1737 ++arg_num; 1738 } 1739 precision_wanted_type.wanted_type = *fki->precision_type; 1740 precision_wanted_type.wanted_type_name = NULL; 1741 precision_wanted_type.pointer_count = 0; 1742 precision_wanted_type.char_lenient_flag = 0; 1743 precision_wanted_type.writing_in_flag = 0; 1744 precision_wanted_type.reading_from_flag = 0; 1745 precision_wanted_type.name = _("field precision"); 1746 precision_wanted_type.param = cur_param; 1747 precision_wanted_type.arg_num = arg_num; 1748 precision_wanted_type.next = NULL; 1749 if (last_wanted_type != 0) 1750 last_wanted_type->next = &precision_wanted_type; 1751 if (first_wanted_type == 0) 1752 first_wanted_type = &precision_wanted_type; 1753 last_wanted_type = &precision_wanted_type; 1754 } 1755 } 1756 else 1757 { 1758 if (!(fki->flags & (int) FMT_FLAG_EMPTY_PREC_OK) 1759 && !ISDIGIT (*format_chars)) 1760 warning (OPT_Wformat, "empty precision in %s format", fki->name); 1761 while (ISDIGIT (*format_chars)) 1762 ++format_chars; 1763 } 1764 } 1765 1766 /* Read any length modifier, if this kind of format has them. */ 1767 fli = fki->length_char_specs; 1768 length_chars = NULL; 1769 length_chars_val = FMT_LEN_none; 1770 length_chars_std = STD_C89; 1771 if (fli) 1772 { 1773 while (fli->name != 0 && fli->name[0] != *format_chars) 1774 fli++; 1775 /* 1776 * Make sure FreeBSD's D format char takes preference 1777 * over new DD length specifier if FreeBSD format 1778 * extensions are requested. 1779 */ 1780 if (fli->index == FMT_LEN_D && flag_format_extensions 1781 && fki->conversion_specs == print_char_table) 1782 while (fli->name != 0) fli++; 1783 if (fli->name != 0) 1784 { 1785 format_chars++; 1786 if (fli->double_name != 0 && fli->name[0] == *format_chars) 1787 { 1788 format_chars++; 1789 length_chars = fli->double_name; 1790 length_chars_val = fli->double_index; 1791 length_chars_std = fli->double_std; 1792 } 1793 else 1794 { 1795 length_chars = fli->name; 1796 length_chars_val = fli->index; 1797 length_chars_std = fli->std; 1798 } 1799 i = strlen (flag_chars); 1800 flag_chars[i++] = fki->length_code_char; 1801 flag_chars[i] = 0; 1802 } 1803 if (pedantic) 1804 { 1805 /* Warn if the length modifier is non-standard. */ 1806 if (ADJ_STD (length_chars_std) > C_STD_VER) 1807 warning (OPT_Wformat, 1808 "%s does not support the %qs %s length modifier", 1809 C_STD_NAME (length_chars_std), length_chars, 1810 fki->name); 1811 } 1812 } 1813 1814 /* Read any modifier (strftime E/O). */ 1815 if (fki->modifier_chars != NULL) 1816 { 1817 while (*format_chars != 0 1818 && strchr (fki->modifier_chars, *format_chars) != 0) 1819 { 1820 if (strchr (flag_chars, *format_chars) != 0) 1821 { 1822 const format_flag_spec *s = get_flag_spec (flag_specs, 1823 *format_chars, NULL); 1824 warning (OPT_Wformat, "repeated %s in format", _(s->name)); 1825 } 1826 else 1827 { 1828 i = strlen (flag_chars); 1829 flag_chars[i++] = *format_chars; 1830 flag_chars[i] = 0; 1831 } 1832 ++format_chars; 1833 } 1834 } 1835 1836 /* Handle the scanf allocation kludge. */ 1837 if (fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 1838 { 1839 if (*format_chars == 'a' && !flag_isoc99) 1840 { 1841 if (format_chars[1] == 's' || format_chars[1] == 'S' 1842 || format_chars[1] == '[') 1843 { 1844 /* 'a' is used as a flag. */ 1845 i = strlen (flag_chars); 1846 flag_chars[i++] = 'a'; 1847 flag_chars[i] = 0; 1848 format_chars++; 1849 } 1850 } 1851 } 1852 1853 format_char = *format_chars; 1854 if (format_char == 0 1855 || (!(fki->flags & (int) FMT_FLAG_FANCY_PERCENT_OK) 1856 && format_char == '%')) 1857 { 1858 warning (OPT_Wformat, "conversion lacks type at end of format"); 1859 continue; 1860 } 1861 format_chars++; 1862 fci = fki->conversion_specs; 1863 while (fci->format_chars != 0 1864 && strchr (fci->format_chars, format_char) == 0) 1865 ++fci; 1866 if (fci->format_chars == 0 && flag_format_extensions 1867 && fki->conversion_specs == print_char_table) 1868 { 1869 fci = fbsd_print_char_table; 1870 while (fci->format_chars != 0 1871 && strchr (fci->format_chars, format_char) == 0) 1872 ++fci; 1873 } 1874 if (fci->format_chars == 0) 1875 { 1876 if (ISGRAPH (format_char)) 1877 warning (OPT_Wformat, "unknown conversion type character %qc in format", 1878 format_char); 1879 else 1880 warning (OPT_Wformat, "unknown conversion type character 0x%x in format", 1881 format_char); 1882 continue; 1883 } 1884 if (pedantic) 1885 { 1886 if (ADJ_STD (fci->std) > C_STD_VER) 1887 warning (OPT_Wformat, "%s does not support the %<%%%c%> %s format", 1888 C_STD_NAME (fci->std), format_char, fki->name); 1889 } 1890 1891 /* Validate the individual flags used, removing any that are invalid. */ 1892 { 1893 int d = 0; 1894 for (i = 0; flag_chars[i] != 0; i++) 1895 { 1896 const format_flag_spec *s = get_flag_spec (flag_specs, 1897 flag_chars[i], NULL); 1898 flag_chars[i - d] = flag_chars[i]; 1899 if (flag_chars[i] == fki->length_code_char) 1900 continue; 1901 if (strchr (fci->flag_chars, flag_chars[i]) == 0) 1902 { 1903 warning (OPT_Wformat, "%s used with %<%%%c%> %s format", 1904 _(s->name), format_char, fki->name); 1905 d++; 1906 continue; 1907 } 1908 if (pedantic) 1909 { 1910 const format_flag_spec *t; 1911 if (ADJ_STD (s->std) > C_STD_VER) 1912 warning (OPT_Wformat, "%s does not support %s", 1913 C_STD_NAME (s->std), _(s->long_name)); 1914 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2); 1915 if (t != NULL && ADJ_STD (t->std) > ADJ_STD (s->std)) 1916 { 1917 const char *long_name = (t->long_name != NULL 1918 ? t->long_name 1919 : s->long_name); 1920 if (ADJ_STD (t->std) > C_STD_VER) 1921 warning (OPT_Wformat, 1922 "%s does not support %s with the %<%%%c%> %s format", 1923 C_STD_NAME (t->std), _(long_name), 1924 format_char, fki->name); 1925 } 1926 } 1927 } 1928 flag_chars[i - d] = 0; 1929 } 1930 1931 if ((fki->flags & (int) FMT_FLAG_SCANF_A_KLUDGE) 1932 && strchr (flag_chars, 'a') != 0) 1933 aflag = 1; 1934 1935 if (fki->suppression_char 1936 && strchr (flag_chars, fki->suppression_char) != 0) 1937 suppressed = 1; 1938 1939 /* Validate the pairs of flags used. */ 1940 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++) 1941 { 1942 const format_flag_spec *s, *t; 1943 if (strchr (flag_chars, bad_flag_pairs[i].flag_char1) == 0) 1944 continue; 1945 if (strchr (flag_chars, bad_flag_pairs[i].flag_char2) == 0) 1946 continue; 1947 if (bad_flag_pairs[i].predicate != 0 1948 && strchr (fci->flags2, bad_flag_pairs[i].predicate) == 0) 1949 continue; 1950 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL); 1951 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL); 1952 if (bad_flag_pairs[i].ignored) 1953 { 1954 if (bad_flag_pairs[i].predicate != 0) 1955 warning (OPT_Wformat, 1956 "%s ignored with %s and %<%%%c%> %s format", 1957 _(s->name), _(t->name), format_char, 1958 fki->name); 1959 else 1960 warning (OPT_Wformat, "%s ignored with %s in %s format", 1961 _(s->name), _(t->name), fki->name); 1962 } 1963 else 1964 { 1965 if (bad_flag_pairs[i].predicate != 0) 1966 warning (OPT_Wformat, 1967 "use of %s and %s together with %<%%%c%> %s format", 1968 _(s->name), _(t->name), format_char, 1969 fki->name); 1970 else 1971 warning (OPT_Wformat, "use of %s and %s together in %s format", 1972 _(s->name), _(t->name), fki->name); 1973 } 1974 } 1975 1976 /* Give Y2K warnings. */ 1977 if (warn_format_y2k) 1978 { 1979 int y2k_level = 0; 1980 if (strchr (fci->flags2, '4') != 0) 1981 if (strchr (flag_chars, 'E') != 0) 1982 y2k_level = 3; 1983 else 1984 y2k_level = 2; 1985 else if (strchr (fci->flags2, '3') != 0) 1986 y2k_level = 3; 1987 else if (strchr (fci->flags2, '2') != 0) 1988 y2k_level = 2; 1989 if (y2k_level == 3) 1990 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of " 1991 "year in some locales on non-BSD systems", format_char); 1992 else if (y2k_level == 2) 1993 warning (OPT_Wformat_y2k, "%<%%%c%> yields only last 2 digits of " 1994 "year", format_char); 1995 } 1996 1997 if (strchr (fci->flags2, '[') != 0) 1998 { 1999 /* Skip over scan set, in case it happens to have '%' in it. */ 2000 if (*format_chars == '^') 2001 ++format_chars; 2002 /* Find closing bracket; if one is hit immediately, then 2003 it's part of the scan set rather than a terminator. */ 2004 if (*format_chars == ']') 2005 ++format_chars; 2006 while (*format_chars && *format_chars != ']') 2007 ++format_chars; 2008 if (*format_chars != ']') 2009 /* The end of the format string was reached. */ 2010 warning (OPT_Wformat, "no closing %<]%> for %<%%[%> format"); 2011 } 2012 2013 wanted_type = 0; 2014 wanted_type_name = 0; 2015 if (fki->flags & (int) FMT_FLAG_ARG_CONVERT) 2016 { 2017 wanted_type = (fci->types[length_chars_val].type 2018 ? *fci->types[length_chars_val].type : 0); 2019 wanted_type_name = fci->types[length_chars_val].name; 2020 wanted_type_std = fci->types[length_chars_val].std; 2021 if (wanted_type == 0) 2022 { 2023 warning (OPT_Wformat, 2024 "use of %qs length modifier with %qc type character", 2025 length_chars, format_char); 2026 /* Heuristic: skip one argument when an invalid length/type 2027 combination is encountered. */ 2028 arg_num++; 2029 if (params == 0) 2030 { 2031 warning (OPT_Wformat, "too few arguments for format"); 2032 return; 2033 } 2034 params = TREE_CHAIN (params); 2035 continue; 2036 } 2037 else if (pedantic 2038 /* Warn if non-standard, provided it is more non-standard 2039 than the length and type characters that may already 2040 have been warned for. */ 2041 && ADJ_STD (wanted_type_std) > ADJ_STD (length_chars_std) 2042 && ADJ_STD (wanted_type_std) > ADJ_STD (fci->std)) 2043 { 2044 if (ADJ_STD (wanted_type_std) > C_STD_VER) 2045 warning (OPT_Wformat, 2046 "%s does not support the %<%%%s%c%> %s format", 2047 C_STD_NAME (wanted_type_std), length_chars, 2048 format_char, fki->name); 2049 } 2050 } 2051 2052 main_wanted_type.next = NULL; 2053 2054 /* Finally. . .check type of argument against desired type! */ 2055 if (info->first_arg_num == 0) 2056 continue; 2057 if ((fci->pointer_count == 0 && wanted_type == void_type_node) 2058 || suppressed) 2059 { 2060 if (main_arg_num != 0) 2061 { 2062 if (suppressed) 2063 warning (OPT_Wformat, "operand number specified with " 2064 "suppressed assignment"); 2065 else 2066 warning (OPT_Wformat, "operand number specified for format " 2067 "taking no argument"); 2068 } 2069 } 2070 else 2071 { 2072 format_wanted_type *wanted_type_ptr; 2073 2074 if (main_arg_num != 0) 2075 { 2076 arg_num = main_arg_num; 2077 params = main_arg_params; 2078 } 2079 else 2080 { 2081 ++arg_num; 2082 if (has_operand_number > 0) 2083 { 2084 warning (OPT_Wformat, "missing $ operand number in format"); 2085 return; 2086 } 2087 else 2088 has_operand_number = 0; 2089 } 2090 2091 wanted_type_ptr = &main_wanted_type; 2092 while (fci) 2093 { 2094 if (params == 0) 2095 { 2096 warning (OPT_Wformat, "too few arguments for format"); 2097 return; 2098 } 2099 2100 cur_param = TREE_VALUE (params); 2101 params = TREE_CHAIN (params); 2102 2103 wanted_type_ptr->wanted_type = wanted_type; 2104 wanted_type_ptr->wanted_type_name = wanted_type_name; 2105 wanted_type_ptr->pointer_count = fci->pointer_count + aflag; 2106 wanted_type_ptr->char_lenient_flag = 0; 2107 if (strchr (fci->flags2, 'c') != 0) 2108 wanted_type_ptr->char_lenient_flag = 1; 2109 wanted_type_ptr->writing_in_flag = 0; 2110 wanted_type_ptr->reading_from_flag = 0; 2111 if (aflag) 2112 wanted_type_ptr->writing_in_flag = 1; 2113 else 2114 { 2115 if (strchr (fci->flags2, 'W') != 0) 2116 wanted_type_ptr->writing_in_flag = 1; 2117 if (strchr (fci->flags2, 'R') != 0) 2118 wanted_type_ptr->reading_from_flag = 1; 2119 } 2120 wanted_type_ptr->name = NULL; 2121 wanted_type_ptr->param = cur_param; 2122 wanted_type_ptr->arg_num = arg_num; 2123 wanted_type_ptr->next = NULL; 2124 if (last_wanted_type != 0) 2125 last_wanted_type->next = wanted_type_ptr; 2126 if (first_wanted_type == 0) 2127 first_wanted_type = wanted_type_ptr; 2128 last_wanted_type = wanted_type_ptr; 2129 2130 fci = fci->chain; 2131 if (fci) 2132 { 2133 wanted_type_ptr = GGC_NEW (format_wanted_type); 2134 arg_num++; 2135 wanted_type = *fci->types[length_chars_val].type; 2136 wanted_type_name = fci->types[length_chars_val].name; 2137 } 2138 } 2139 } 2140 2141 if (first_wanted_type != 0) 2142 check_format_types (first_wanted_type, format_start, 2143 format_chars - format_start); 2144 2145 if (main_wanted_type.next != NULL) 2146 { 2147 format_wanted_type *wanted_type_ptr = main_wanted_type.next; 2148 while (wanted_type_ptr) 2149 { 2150 format_wanted_type *next = wanted_type_ptr->next; 2151 ggc_free (wanted_type_ptr); 2152 wanted_type_ptr = next; 2153 } 2154 } 2155 } 2156} 2157 2158 2159/* Check the argument types from a single format conversion (possibly 2160 including width and precision arguments). */ 2161static void 2162check_format_types (format_wanted_type *types, const char *format_start, 2163 int format_length) 2164{ 2165 for (; types != 0; types = types->next) 2166 { 2167 tree cur_param; 2168 tree cur_type; 2169 tree orig_cur_type; 2170 tree wanted_type; 2171 int arg_num; 2172 int i; 2173 int char_type_flag; 2174 cur_param = types->param; 2175 cur_type = TREE_TYPE (cur_param); 2176 if (cur_type == error_mark_node) 2177 continue; 2178 orig_cur_type = cur_type; 2179 char_type_flag = 0; 2180 wanted_type = types->wanted_type; 2181 arg_num = types->arg_num; 2182 2183 /* The following should not occur here. */ 2184 gcc_assert (wanted_type); 2185 gcc_assert (wanted_type != void_type_node || types->pointer_count); 2186 2187 if (types->pointer_count == 0) 2188 wanted_type = lang_hooks.types.type_promotes_to (wanted_type); 2189 2190 wanted_type = TYPE_MAIN_VARIANT (wanted_type); 2191 2192 STRIP_NOPS (cur_param); 2193 2194 /* Check the types of any additional pointer arguments 2195 that precede the "real" argument. */ 2196 for (i = 0; i < types->pointer_count; ++i) 2197 { 2198 if (TREE_CODE (cur_type) == POINTER_TYPE) 2199 { 2200 cur_type = TREE_TYPE (cur_type); 2201 if (cur_type == error_mark_node) 2202 break; 2203 2204 /* Check for writing through a NULL pointer. */ 2205 if (types->writing_in_flag 2206 && i == 0 2207 && cur_param != 0 2208 && integer_zerop (cur_param)) 2209 warning (OPT_Wformat, "writing through null pointer " 2210 "(argument %d)", arg_num); 2211 2212 /* Check for reading through a NULL pointer. */ 2213 if (types->reading_from_flag 2214 && i == 0 2215 && cur_param != 0 2216 && integer_zerop (cur_param)) 2217 warning (OPT_Wformat, "reading through null pointer " 2218 "(argument %d)", arg_num); 2219 2220 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR) 2221 cur_param = TREE_OPERAND (cur_param, 0); 2222 else 2223 cur_param = 0; 2224 2225 /* See if this is an attempt to write into a const type with 2226 scanf or with printf "%n". Note: the writing in happens 2227 at the first indirection only, if for example 2228 void * const * is passed to scanf %p; passing 2229 const void ** is simply passing an incompatible type. */ 2230 if (types->writing_in_flag 2231 && i == 0 2232 && (TYPE_READONLY (cur_type) 2233 || (cur_param != 0 2234 && (CONSTANT_CLASS_P (cur_param) 2235 || (DECL_P (cur_param) 2236 && TREE_READONLY (cur_param)))))) 2237 warning (OPT_Wformat, "writing into constant object " 2238 "(argument %d)", arg_num); 2239 2240 /* If there are extra type qualifiers beyond the first 2241 indirection, then this makes the types technically 2242 incompatible. */ 2243 if (i > 0 2244 && pedantic 2245 && (TYPE_READONLY (cur_type) 2246 || TYPE_VOLATILE (cur_type) 2247 || TYPE_RESTRICT (cur_type))) 2248 warning (OPT_Wformat, "extra type qualifiers in format " 2249 "argument (argument %d)", 2250 arg_num); 2251 2252 } 2253 else 2254 { 2255 format_type_warning (types->name, format_start, format_length, 2256 wanted_type, types->pointer_count, 2257 types->wanted_type_name, orig_cur_type, 2258 arg_num); 2259 break; 2260 } 2261 } 2262 2263 if (i < types->pointer_count) 2264 continue; 2265 2266 cur_type = TYPE_MAIN_VARIANT (cur_type); 2267 2268 /* Check whether the argument type is a character type. This leniency 2269 only applies to certain formats, flagged with 'c'. 2270 */ 2271 if (types->char_lenient_flag) 2272 char_type_flag = (cur_type == char_type_node 2273 || cur_type == signed_char_type_node 2274 || cur_type == unsigned_char_type_node); 2275 2276 /* Check the type of the "real" argument, if there's a type we want. */ 2277 if (lang_hooks.types_compatible_p (wanted_type, cur_type)) 2278 continue; 2279 /* If we want 'void *', allow any pointer type. 2280 (Anything else would already have got a warning.) 2281 With -pedantic, only allow pointers to void and to character 2282 types. */ 2283 if (wanted_type == void_type_node 2284 && (!pedantic || (i == 1 && char_type_flag))) 2285 continue; 2286 /* Don't warn about differences merely in signedness, unless 2287 -pedantic. With -pedantic, warn if the type is a pointer 2288 target and not a character type, and for character types at 2289 a second level of indirection. */ 2290 if (TREE_CODE (wanted_type) == INTEGER_TYPE 2291 && TREE_CODE (cur_type) == INTEGER_TYPE 2292 && (!pedantic || i == 0 || (i == 1 && char_type_flag)) 2293 && (TYPE_UNSIGNED (wanted_type) 2294 ? wanted_type == c_common_unsigned_type (cur_type) 2295 : wanted_type == c_common_signed_type (cur_type))) 2296 continue; 2297 /* Likewise, "signed char", "unsigned char" and "char" are 2298 equivalent but the above test won't consider them equivalent. */ 2299 if (wanted_type == char_type_node 2300 && (!pedantic || i < 2) 2301 && char_type_flag) 2302 continue; 2303 /* Now we have a type mismatch. */ 2304 format_type_warning (types->name, format_start, format_length, 2305 wanted_type, types->pointer_count, 2306 types->wanted_type_name, orig_cur_type, arg_num); 2307 } 2308} 2309 2310 2311/* Give a warning about a format argument of different type from that 2312 expected. DESCR is a description such as "field precision", or 2313 NULL for an ordinary format. For an ordinary format, FORMAT_START 2314 points to where the format starts in the format string and 2315 FORMAT_LENGTH is its length. WANTED_TYPE is the type the argument 2316 should have after POINTER_COUNT pointer dereferences. 2317 WANTED_NAME_NAME is a possibly more friendly name of WANTED_TYPE, 2318 or NULL if the ordinary name of the type should be used. ARG_TYPE 2319 is the type of the actual argument. ARG_NUM is the number of that 2320 argument. */ 2321static void 2322format_type_warning (const char *descr, const char *format_start, 2323 int format_length, tree wanted_type, int pointer_count, 2324 const char *wanted_type_name, tree arg_type, int arg_num) 2325{ 2326 char *p; 2327 /* If ARG_TYPE is a typedef with a misleading name (for example, 2328 size_t but not the standard size_t expected by printf %zu), avoid 2329 printing the typedef name. */ 2330 if (wanted_type_name 2331 && TYPE_NAME (arg_type) 2332 && TREE_CODE (TYPE_NAME (arg_type)) == TYPE_DECL 2333 && DECL_NAME (TYPE_NAME (arg_type)) 2334 && !strcmp (wanted_type_name, 2335 lang_hooks.decl_printable_name (TYPE_NAME (arg_type), 2))) 2336 arg_type = TYPE_MAIN_VARIANT (arg_type); 2337 /* The format type and name exclude any '*' for pointers, so those 2338 must be formatted manually. For all the types we currently have, 2339 this is adequate, but formats taking pointers to functions or 2340 arrays would require the full type to be built up in order to 2341 print it with %T. */ 2342 p = (char *) alloca (pointer_count + 2); 2343 if (pointer_count == 0) 2344 p[0] = 0; 2345 else if (c_dialect_cxx ()) 2346 { 2347 memset (p, '*', pointer_count); 2348 p[pointer_count] = 0; 2349 } 2350 else 2351 { 2352 p[0] = ' '; 2353 memset (p + 1, '*', pointer_count); 2354 p[pointer_count + 1] = 0; 2355 } 2356 if (wanted_type_name) 2357 { 2358 if (descr) 2359 warning (OPT_Wformat, "%s should have type %<%s%s%>, " 2360 "but argument %d has type %qT", 2361 descr, wanted_type_name, p, arg_num, arg_type); 2362 else 2363 warning (OPT_Wformat, "format %q.*s expects type %<%s%s%>, " 2364 "but argument %d has type %qT", 2365 format_length, format_start, wanted_type_name, p, 2366 arg_num, arg_type); 2367 } 2368 else 2369 { 2370 if (descr) 2371 warning (OPT_Wformat, "%s should have type %<%T%s%>, " 2372 "but argument %d has type %qT", 2373 descr, wanted_type, p, arg_num, arg_type); 2374 else 2375 warning (OPT_Wformat, "format %q.*s expects type %<%T%s%>, " 2376 "but argument %d has type %qT", 2377 format_length, format_start, wanted_type, p, arg_num, arg_type); 2378 } 2379} 2380 2381 2382/* Given a format_char_info array FCI, and a character C, this function 2383 returns the index into the conversion_specs where that specifier's 2384 data is located. The character must exist. */ 2385static unsigned int 2386find_char_info_specifier_index (const format_char_info *fci, int c) 2387{ 2388 unsigned i; 2389 2390 for (i = 0; fci->format_chars; i++, fci++) 2391 if (strchr (fci->format_chars, c)) 2392 return i; 2393 2394 /* We shouldn't be looking for a non-existent specifier. */ 2395 gcc_unreachable (); 2396} 2397 2398/* Given a format_length_info array FLI, and a character C, this 2399 function returns the index into the conversion_specs where that 2400 modifier's data is located. The character must exist. */ 2401static unsigned int 2402find_length_info_modifier_index (const format_length_info *fli, int c) 2403{ 2404 unsigned i; 2405 2406 for (i = 0; fli->name; i++, fli++) 2407 if (strchr (fli->name, c)) 2408 return i; 2409 2410 /* We shouldn't be looking for a non-existent modifier. */ 2411 gcc_unreachable (); 2412} 2413 2414/* Determine the type of HOST_WIDE_INT in the code being compiled for 2415 use in GCC's __asm_fprintf__ custom format attribute. You must 2416 have set dynamic_format_types before calling this function. */ 2417static void 2418init_dynamic_asm_fprintf_info (void) 2419{ 2420 static tree hwi; 2421 2422 if (!hwi) 2423 { 2424 format_length_info *new_asm_fprintf_length_specs; 2425 unsigned int i; 2426 2427 /* Find the underlying type for HOST_WIDE_INT. For the %w 2428 length modifier to work, one must have issued: "typedef 2429 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 2430 prior to using that modifier. */ 2431 hwi = maybe_get_identifier ("__gcc_host_wide_int__"); 2432 if (!hwi) 2433 { 2434 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2435 return; 2436 } 2437 hwi = identifier_global_value (hwi); 2438 if (!hwi || TREE_CODE (hwi) != TYPE_DECL) 2439 { 2440 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2441 return; 2442 } 2443 hwi = DECL_ORIGINAL_TYPE (hwi); 2444 gcc_assert (hwi); 2445 if (hwi != long_integer_type_node && hwi != long_long_integer_type_node) 2446 { 2447 error ("%<__gcc_host_wide_int__%> is not defined as %<long%>" 2448 " or %<long long%>"); 2449 return; 2450 } 2451 2452 /* Create a new (writable) copy of asm_fprintf_length_specs. */ 2453 new_asm_fprintf_length_specs = (format_length_info *) 2454 xmemdup (asm_fprintf_length_specs, 2455 sizeof (asm_fprintf_length_specs), 2456 sizeof (asm_fprintf_length_specs)); 2457 2458 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 2459 i = find_length_info_modifier_index (new_asm_fprintf_length_specs, 'w'); 2460 if (hwi == long_integer_type_node) 2461 new_asm_fprintf_length_specs[i].index = FMT_LEN_l; 2462 else if (hwi == long_long_integer_type_node) 2463 new_asm_fprintf_length_specs[i].index = FMT_LEN_ll; 2464 else 2465 gcc_unreachable (); 2466 2467 /* Assign the new data for use. */ 2468 dynamic_format_types[asm_fprintf_format_type].length_char_specs = 2469 new_asm_fprintf_length_specs; 2470 } 2471} 2472 2473/* Determine the type of a "locus" in the code being compiled for use 2474 in GCC's __gcc_gfc__ custom format attribute. You must have set 2475 dynamic_format_types before calling this function. */ 2476static void 2477init_dynamic_gfc_info (void) 2478{ 2479 static tree locus; 2480 2481 if (!locus) 2482 { 2483 static format_char_info *gfc_fci; 2484 2485 /* For the GCC __gcc_gfc__ custom format specifier to work, one 2486 must have declared 'locus' prior to using this attribute. If 2487 we haven't seen this declarations then you shouldn't use the 2488 specifier requiring that type. */ 2489 if ((locus = maybe_get_identifier ("locus"))) 2490 { 2491 locus = identifier_global_value (locus); 2492 if (locus) 2493 { 2494 if (TREE_CODE (locus) != TYPE_DECL) 2495 { 2496 error ("%<locus%> is not defined as a type"); 2497 locus = 0; 2498 } 2499 else 2500 locus = TREE_TYPE (locus); 2501 } 2502 } 2503 2504 /* Assign the new data for use. */ 2505 2506 /* Handle the __gcc_gfc__ format specifics. */ 2507 if (!gfc_fci) 2508 dynamic_format_types[gcc_gfc_format_type].conversion_specs = 2509 gfc_fci = (format_char_info *) 2510 xmemdup (gcc_gfc_char_table, 2511 sizeof (gcc_gfc_char_table), 2512 sizeof (gcc_gfc_char_table)); 2513 if (locus) 2514 { 2515 const unsigned i = find_char_info_specifier_index (gfc_fci, 'L'); 2516 gfc_fci[i].types[0].type = &locus; 2517 gfc_fci[i].pointer_count = 1; 2518 } 2519 } 2520} 2521 2522/* Determine the types of "tree" and "location_t" in the code being 2523 compiled for use in GCC's diagnostic custom format attributes. You 2524 must have set dynamic_format_types before calling this function. */ 2525static void 2526init_dynamic_diag_info (void) 2527{ 2528 static tree t, loc, hwi; 2529 2530 if (!loc || !t || !hwi) 2531 { 2532 static format_char_info *diag_fci, *tdiag_fci, *cdiag_fci, *cxxdiag_fci; 2533 static format_length_info *diag_ls; 2534 unsigned int i; 2535 2536 /* For the GCC-diagnostics custom format specifiers to work, one 2537 must have declared 'tree' and/or 'location_t' prior to using 2538 those attributes. If we haven't seen these declarations then 2539 you shouldn't use the specifiers requiring these types. 2540 However we don't force a hard ICE because we may see only one 2541 or the other type. */ 2542 if ((loc = maybe_get_identifier ("location_t"))) 2543 { 2544 loc = identifier_global_value (loc); 2545 if (loc) 2546 { 2547 if (TREE_CODE (loc) != TYPE_DECL) 2548 { 2549 error ("%<location_t%> is not defined as a type"); 2550 loc = 0; 2551 } 2552 else 2553 loc = TREE_TYPE (loc); 2554 } 2555 } 2556 2557 /* We need to grab the underlying 'union tree_node' so peek into 2558 an extra type level. */ 2559 if ((t = maybe_get_identifier ("tree"))) 2560 { 2561 t = identifier_global_value (t); 2562 if (t) 2563 { 2564 if (TREE_CODE (t) != TYPE_DECL) 2565 { 2566 error ("%<tree%> is not defined as a type"); 2567 t = 0; 2568 } 2569 else if (TREE_CODE (TREE_TYPE (t)) != POINTER_TYPE) 2570 { 2571 error ("%<tree%> is not defined as a pointer type"); 2572 t = 0; 2573 } 2574 else 2575 t = TREE_TYPE (TREE_TYPE (t)); 2576 } 2577 } 2578 2579 /* Find the underlying type for HOST_WIDE_INT. For the %w 2580 length modifier to work, one must have issued: "typedef 2581 HOST_WIDE_INT __gcc_host_wide_int__;" in one's source code 2582 prior to using that modifier. */ 2583 if ((hwi = maybe_get_identifier ("__gcc_host_wide_int__"))) 2584 { 2585 hwi = identifier_global_value (hwi); 2586 if (hwi) 2587 { 2588 if (TREE_CODE (hwi) != TYPE_DECL) 2589 { 2590 error ("%<__gcc_host_wide_int__%> is not defined as a type"); 2591 hwi = 0; 2592 } 2593 else 2594 { 2595 hwi = DECL_ORIGINAL_TYPE (hwi); 2596 gcc_assert (hwi); 2597 if (hwi != long_integer_type_node 2598 && hwi != long_long_integer_type_node) 2599 { 2600 error ("%<__gcc_host_wide_int__%> is not defined" 2601 " as %<long%> or %<long long%>"); 2602 hwi = 0; 2603 } 2604 } 2605 } 2606 } 2607 2608 /* Assign the new data for use. */ 2609 2610 /* All the GCC diag formats use the same length specs. */ 2611 if (!diag_ls) 2612 dynamic_format_types[gcc_diag_format_type].length_char_specs = 2613 dynamic_format_types[gcc_tdiag_format_type].length_char_specs = 2614 dynamic_format_types[gcc_cdiag_format_type].length_char_specs = 2615 dynamic_format_types[gcc_cxxdiag_format_type].length_char_specs = 2616 diag_ls = (format_length_info *) 2617 xmemdup (gcc_diag_length_specs, 2618 sizeof (gcc_diag_length_specs), 2619 sizeof (gcc_diag_length_specs)); 2620 if (hwi) 2621 { 2622 /* HOST_WIDE_INT must be one of 'long' or 'long long'. */ 2623 i = find_length_info_modifier_index (diag_ls, 'w'); 2624 if (hwi == long_integer_type_node) 2625 diag_ls[i].index = FMT_LEN_l; 2626 else if (hwi == long_long_integer_type_node) 2627 diag_ls[i].index = FMT_LEN_ll; 2628 else 2629 gcc_unreachable (); 2630 } 2631 2632 /* Handle the __gcc_diag__ format specifics. */ 2633 if (!diag_fci) 2634 dynamic_format_types[gcc_diag_format_type].conversion_specs = 2635 diag_fci = (format_char_info *) 2636 xmemdup (gcc_diag_char_table, 2637 sizeof (gcc_diag_char_table), 2638 sizeof (gcc_diag_char_table)); 2639 if (loc) 2640 { 2641 i = find_char_info_specifier_index (diag_fci, 'H'); 2642 diag_fci[i].types[0].type = &loc; 2643 diag_fci[i].pointer_count = 1; 2644 } 2645 if (t) 2646 { 2647 i = find_char_info_specifier_index (diag_fci, 'J'); 2648 diag_fci[i].types[0].type = &t; 2649 diag_fci[i].pointer_count = 1; 2650 } 2651 2652 /* Handle the __gcc_tdiag__ format specifics. */ 2653 if (!tdiag_fci) 2654 dynamic_format_types[gcc_tdiag_format_type].conversion_specs = 2655 tdiag_fci = (format_char_info *) 2656 xmemdup (gcc_tdiag_char_table, 2657 sizeof (gcc_tdiag_char_table), 2658 sizeof (gcc_tdiag_char_table)); 2659 if (loc) 2660 { 2661 i = find_char_info_specifier_index (tdiag_fci, 'H'); 2662 tdiag_fci[i].types[0].type = &loc; 2663 tdiag_fci[i].pointer_count = 1; 2664 } 2665 if (t) 2666 { 2667 /* All specifiers taking a tree share the same struct. */ 2668 i = find_char_info_specifier_index (tdiag_fci, 'D'); 2669 tdiag_fci[i].types[0].type = &t; 2670 tdiag_fci[i].pointer_count = 1; 2671 i = find_char_info_specifier_index (tdiag_fci, 'J'); 2672 tdiag_fci[i].types[0].type = &t; 2673 tdiag_fci[i].pointer_count = 1; 2674 } 2675 2676 /* Handle the __gcc_cdiag__ format specifics. */ 2677 if (!cdiag_fci) 2678 dynamic_format_types[gcc_cdiag_format_type].conversion_specs = 2679 cdiag_fci = (format_char_info *) 2680 xmemdup (gcc_cdiag_char_table, 2681 sizeof (gcc_cdiag_char_table), 2682 sizeof (gcc_cdiag_char_table)); 2683 if (loc) 2684 { 2685 i = find_char_info_specifier_index (cdiag_fci, 'H'); 2686 cdiag_fci[i].types[0].type = &loc; 2687 cdiag_fci[i].pointer_count = 1; 2688 } 2689 if (t) 2690 { 2691 /* All specifiers taking a tree share the same struct. */ 2692 i = find_char_info_specifier_index (cdiag_fci, 'D'); 2693 cdiag_fci[i].types[0].type = &t; 2694 cdiag_fci[i].pointer_count = 1; 2695 i = find_char_info_specifier_index (cdiag_fci, 'J'); 2696 cdiag_fci[i].types[0].type = &t; 2697 cdiag_fci[i].pointer_count = 1; 2698 } 2699 2700 /* Handle the __gcc_cxxdiag__ format specifics. */ 2701 if (!cxxdiag_fci) 2702 dynamic_format_types[gcc_cxxdiag_format_type].conversion_specs = 2703 cxxdiag_fci = (format_char_info *) 2704 xmemdup (gcc_cxxdiag_char_table, 2705 sizeof (gcc_cxxdiag_char_table), 2706 sizeof (gcc_cxxdiag_char_table)); 2707 if (loc) 2708 { 2709 i = find_char_info_specifier_index (cxxdiag_fci, 'H'); 2710 cxxdiag_fci[i].types[0].type = &loc; 2711 cxxdiag_fci[i].pointer_count = 1; 2712 } 2713 if (t) 2714 { 2715 /* All specifiers taking a tree share the same struct. */ 2716 i = find_char_info_specifier_index (cxxdiag_fci, 'D'); 2717 cxxdiag_fci[i].types[0].type = &t; 2718 cxxdiag_fci[i].pointer_count = 1; 2719 i = find_char_info_specifier_index (cxxdiag_fci, 'J'); 2720 cxxdiag_fci[i].types[0].type = &t; 2721 cxxdiag_fci[i].pointer_count = 1; 2722 } 2723 } 2724} 2725 2726#ifdef TARGET_FORMAT_TYPES 2727extern const format_kind_info TARGET_FORMAT_TYPES[]; 2728#endif 2729 2730/* Handle a "format" attribute; arguments as in 2731 struct attribute_spec.handler. */ 2732tree 2733handle_format_attribute (tree *node, tree ARG_UNUSED (name), tree args, 2734 int flags, bool *no_add_attrs) 2735{ 2736 tree type = *node; 2737 function_format_info info; 2738 tree argument; 2739 2740#ifdef TARGET_FORMAT_TYPES 2741 /* If the target provides additional format types, we need to 2742 add them to FORMAT_TYPES at first use. */ 2743 if (TARGET_FORMAT_TYPES != NULL && !dynamic_format_types) 2744 { 2745 dynamic_format_types = xmalloc ((n_format_types + TARGET_N_FORMAT_TYPES) 2746 * sizeof (dynamic_format_types[0])); 2747 memcpy (dynamic_format_types, format_types_orig, 2748 sizeof (format_types_orig)); 2749 memcpy (&dynamic_format_types[n_format_types], TARGET_FORMAT_TYPES, 2750 TARGET_N_FORMAT_TYPES * sizeof (dynamic_format_types[0])); 2751 2752 format_types = dynamic_format_types; 2753 n_format_types += TARGET_N_FORMAT_TYPES; 2754 } 2755#endif 2756 2757 if (!decode_format_attr (args, &info, 0)) 2758 { 2759 *no_add_attrs = true; 2760 return NULL_TREE; 2761 } 2762 2763 argument = TYPE_ARG_TYPES (type); 2764 if (argument) 2765 { 2766 if (!check_format_string (argument, info.format_num, flags, 2767 no_add_attrs)) 2768 return NULL_TREE; 2769 2770 if (info.first_arg_num != 0) 2771 { 2772 unsigned HOST_WIDE_INT arg_num = 1; 2773 2774 /* Verify that first_arg_num points to the last arg, 2775 the ... */ 2776 while (argument) 2777 arg_num++, argument = TREE_CHAIN (argument); 2778 2779 if (arg_num != info.first_arg_num) 2780 { 2781 if (!(flags & (int) ATTR_FLAG_BUILT_IN)) 2782 error ("args to be formatted is not %<...%>"); 2783 *no_add_attrs = true; 2784 return NULL_TREE; 2785 } 2786 } 2787 } 2788 2789 if (info.format_type == strftime_format_type && info.first_arg_num != 0) 2790 { 2791 error ("strftime formats cannot format arguments"); 2792 *no_add_attrs = true; 2793 return NULL_TREE; 2794 } 2795 2796 /* If this is a custom GCC-internal format type, we have to 2797 initialize certain bits a runtime. */ 2798 if (info.format_type == asm_fprintf_format_type 2799 || info.format_type == gcc_gfc_format_type 2800 || info.format_type == gcc_diag_format_type 2801 || info.format_type == gcc_tdiag_format_type 2802 || info.format_type == gcc_cdiag_format_type 2803 || info.format_type == gcc_cxxdiag_format_type) 2804 { 2805 /* Our first time through, we have to make sure that our 2806 format_type data is allocated dynamically and is modifiable. */ 2807 if (!dynamic_format_types) 2808 format_types = dynamic_format_types = (format_kind_info *) 2809 xmemdup (format_types_orig, sizeof (format_types_orig), 2810 sizeof (format_types_orig)); 2811 2812 /* If this is format __asm_fprintf__, we have to initialize 2813 GCC's notion of HOST_WIDE_INT for checking %wd. */ 2814 if (info.format_type == asm_fprintf_format_type) 2815 init_dynamic_asm_fprintf_info (); 2816 /* If this is format __gcc_gfc__, we have to initialize GCC's 2817 notion of 'locus' at runtime for %L. */ 2818 else if (info.format_type == gcc_gfc_format_type) 2819 init_dynamic_gfc_info (); 2820 /* If this is one of the diagnostic attributes, then we have to 2821 initialize 'location_t' and 'tree' at runtime. */ 2822 else if (info.format_type == gcc_diag_format_type 2823 || info.format_type == gcc_tdiag_format_type 2824 || info.format_type == gcc_cdiag_format_type 2825 || info.format_type == gcc_cxxdiag_format_type) 2826 init_dynamic_diag_info (); 2827 else 2828 gcc_unreachable (); 2829 } 2830 2831 return NULL_TREE; 2832} 2833