1 /* CPP Library. 2 Copyright (C) 1986-2022 Free Software Foundation, Inc. 3 Contributed by Per Bothner, 1994-95. 4 Based on CCCP program by Paul Rubin, June 1986 5 Adapted to ANSI C, Richard Stallman, Jan 1987 6 7 This program is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published by the 9 Free Software Foundation; either version 3, or (at your option) any 10 later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 #include "config.h" 22 #include "system.h" 23 #include "cpplib.h" 24 #include "internal.h" 25 #include "mkdeps.h" 26 #include "localedir.h" 27 #include "filenames.h" 28 29 #ifndef ENABLE_CANONICAL_SYSTEM_HEADERS 30 #ifdef HAVE_DOS_BASED_FILE_SYSTEM 31 #define ENABLE_CANONICAL_SYSTEM_HEADERS 1 32 #else 33 #define ENABLE_CANONICAL_SYSTEM_HEADERS 0 34 #endif 35 #endif 36 37 static void init_library (void); 38 static void mark_named_operators (cpp_reader *, int); 39 static bool read_original_filename (cpp_reader *); 40 static void read_original_directory (cpp_reader *); 41 static void post_options (cpp_reader *); 42 43 /* If we have designated initializers (GCC >2.7) these tables can be 44 initialized, constant data. Otherwise, they have to be filled in at 45 runtime. */ 46 #if HAVE_DESIGNATED_INITIALIZERS 47 48 #define init_trigraph_map() /* Nothing. */ 49 #define TRIGRAPH_MAP \ 50 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 51 52 #define END }; 53 #define s(p, v) [p] = v, 54 55 #else 56 57 #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \ 58 static void init_trigraph_map (void) { \ 59 unsigned char *x = _cpp_trigraph_map; 60 61 #define END } 62 #define s(p, v) x[p] = v; 63 64 #endif 65 66 TRIGRAPH_MAP 67 s('=', '#') s(')', ']') s('!', '|') 68 s('(', '[') s('\'', '^') s('>', '}') 69 s('/', '\\') s('<', '{') s('-', '~') 70 END 71 72 #undef s 73 #undef END 74 #undef TRIGRAPH_MAP 75 76 /* A set of booleans indicating what CPP features each source language 77 requires. */ 78 struct lang_flags 79 { 80 char c99; 81 char cplusplus; 82 char extended_numbers; 83 char extended_identifiers; 84 char c11_identifiers; 85 char std; 86 char digraphs; 87 char uliterals; 88 char rliterals; 89 char user_literals; 90 char binary_constants; 91 char digit_separators; 92 char trigraphs; 93 char utf8_char_literals; 94 char va_opt; 95 char scope; 96 char dfp_constants; 97 char size_t_literals; 98 char elifdef; 99 }; 100 101 static const struct lang_flags lang_defaults[] = 102 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp szlit elifdef */ 103 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 }, 104 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 }, 105 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 }, 106 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 }, 107 /* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1 }, 108 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 }, 109 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 }, 110 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 }, 111 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 }, 112 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 }, 113 /* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1 }, 114 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 }, 115 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0 }, 116 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0 }, 117 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0 }, 118 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0 }, 119 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0 }, 120 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0 }, 121 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0 }, 122 /* GNUCXX20 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0 }, 123 /* CXX20 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0 }, 124 /* GNUCXX23 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1 }, 125 /* CXX23 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1 }, 126 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } 127 }; 128 129 /* Sets internal flags correctly for a given language. */ 130 void 131 cpp_set_lang (cpp_reader *pfile, enum c_lang lang) 132 { 133 const struct lang_flags *l = &lang_defaults[(int) lang]; 134 135 CPP_OPTION (pfile, lang) = lang; 136 137 CPP_OPTION (pfile, c99) = l->c99; 138 CPP_OPTION (pfile, cplusplus) = l->cplusplus; 139 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers; 140 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers; 141 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers; 142 CPP_OPTION (pfile, std) = l->std; 143 CPP_OPTION (pfile, digraphs) = l->digraphs; 144 CPP_OPTION (pfile, uliterals) = l->uliterals; 145 CPP_OPTION (pfile, rliterals) = l->rliterals; 146 CPP_OPTION (pfile, user_literals) = l->user_literals; 147 CPP_OPTION (pfile, binary_constants) = l->binary_constants; 148 CPP_OPTION (pfile, digit_separators) = l->digit_separators; 149 CPP_OPTION (pfile, trigraphs) = l->trigraphs; 150 CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals; 151 CPP_OPTION (pfile, va_opt) = l->va_opt; 152 CPP_OPTION (pfile, scope) = l->scope; 153 CPP_OPTION (pfile, dfp_constants) = l->dfp_constants; 154 CPP_OPTION (pfile, size_t_literals) = l->size_t_literals; 155 CPP_OPTION (pfile, elifdef) = l->elifdef; 156 } 157 158 /* Initialize library global state. */ 159 static void 160 init_library (void) 161 { 162 static int initialized = 0; 163 164 if (! initialized) 165 { 166 initialized = 1; 167 168 _cpp_init_lexer (); 169 170 /* Set up the trigraph map. This doesn't need to do anything if 171 we were compiled with a compiler that supports C99 designated 172 initializers. */ 173 init_trigraph_map (); 174 175 #ifdef ENABLE_NLS 176 (void) bindtextdomain (PACKAGE, LOCALEDIR); 177 #endif 178 } 179 } 180 181 /* Initialize a cpp_reader structure. */ 182 cpp_reader * 183 cpp_create_reader (enum c_lang lang, cpp_hash_table *table, 184 class line_maps *line_table) 185 { 186 cpp_reader *pfile; 187 188 /* Initialize this instance of the library if it hasn't been already. */ 189 init_library (); 190 191 pfile = XCNEW (cpp_reader); 192 memset (&pfile->base_context, 0, sizeof (pfile->base_context)); 193 194 cpp_set_lang (pfile, lang); 195 CPP_OPTION (pfile, warn_multichar) = 1; 196 CPP_OPTION (pfile, discard_comments) = 1; 197 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1; 198 CPP_OPTION (pfile, max_include_depth) = 200; 199 CPP_OPTION (pfile, operator_names) = 1; 200 CPP_OPTION (pfile, warn_trigraphs) = 2; 201 CPP_OPTION (pfile, warn_endif_labels) = 1; 202 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1; 203 CPP_OPTION (pfile, cpp_warn_c11_c2x_compat) = -1; 204 CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0; 205 CPP_OPTION (pfile, cpp_warn_deprecated) = 1; 206 CPP_OPTION (pfile, cpp_warn_long_long) = 0; 207 CPP_OPTION (pfile, dollars_in_ident) = 1; 208 CPP_OPTION (pfile, warn_dollars) = 1; 209 CPP_OPTION (pfile, warn_variadic_macros) = 1; 210 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1; 211 CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0; 212 /* By default, track locations of tokens resulting from macro 213 expansion. The '2' means, track the locations with the highest 214 accuracy. Read the comments for struct 215 cpp_options::track_macro_expansion to learn about the other 216 values. */ 217 CPP_OPTION (pfile, track_macro_expansion) = 2; 218 CPP_OPTION (pfile, warn_normalize) = normalized_C; 219 CPP_OPTION (pfile, warn_literal_suffix) = 1; 220 CPP_OPTION (pfile, canonical_system_headers) 221 = ENABLE_CANONICAL_SYSTEM_HEADERS; 222 CPP_OPTION (pfile, ext_numeric_literals) = 1; 223 CPP_OPTION (pfile, warn_date_time) = 0; 224 CPP_OPTION (pfile, cpp_warn_bidirectional) = bidirectional_unpaired; 225 226 /* Default CPP arithmetic to something sensible for the host for the 227 benefit of dumb users like fix-header. */ 228 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long); 229 CPP_OPTION (pfile, char_precision) = CHAR_BIT; 230 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int); 231 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int); 232 CPP_OPTION (pfile, unsigned_char) = 0; 233 CPP_OPTION (pfile, unsigned_wchar) = 1; 234 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */ 235 236 /* Default to no charset conversion. */ 237 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding (); 238 CPP_OPTION (pfile, wide_charset) = 0; 239 240 /* Default the input character set to UTF-8. */ 241 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding (); 242 243 /* A fake empty "directory" used as the starting point for files 244 looked up without a search path. Name cannot be '/' because we 245 don't want to prepend anything at all to filenames using it. All 246 other entries are correct zero-initialized. */ 247 pfile->no_search_path.name = (char *) ""; 248 249 /* Initialize the line map. */ 250 pfile->line_table = line_table; 251 252 /* Initialize lexer state. */ 253 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); 254 255 /* Set up static tokens. */ 256 pfile->avoid_paste.type = CPP_PADDING; 257 pfile->avoid_paste.val.source = NULL; 258 pfile->avoid_paste.src_loc = 0; 259 pfile->endarg.type = CPP_EOF; 260 pfile->endarg.flags = 0; 261 pfile->endarg.src_loc = 0; 262 263 /* Create a token buffer for the lexer. */ 264 _cpp_init_tokenrun (&pfile->base_run, 250); 265 pfile->cur_run = &pfile->base_run; 266 pfile->cur_token = pfile->base_run.base; 267 268 /* Initialize the base context. */ 269 pfile->context = &pfile->base_context; 270 pfile->base_context.c.macro = 0; 271 pfile->base_context.prev = pfile->base_context.next = 0; 272 273 /* Aligned and unaligned storage. */ 274 pfile->a_buff = _cpp_get_buff (pfile, 0); 275 pfile->u_buff = _cpp_get_buff (pfile, 0); 276 277 /* Initialize table for push_macro/pop_macro. */ 278 pfile->pushed_macros = 0; 279 280 /* Do not force token locations by default. */ 281 pfile->forced_token_location = 0; 282 283 /* Note the timestamp is unset. */ 284 pfile->time_stamp = time_t (-1); 285 pfile->time_stamp_kind = 0; 286 287 /* The expression parser stack. */ 288 _cpp_expand_op_stack (pfile); 289 290 /* Initialize the buffer obstack. */ 291 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free); 292 293 _cpp_init_files (pfile); 294 295 _cpp_init_hashtable (pfile, table); 296 297 return pfile; 298 } 299 300 /* Set the line_table entry in PFILE. This is called after reading a 301 PCH file, as the old line_table will be incorrect. */ 302 void 303 cpp_set_line_map (cpp_reader *pfile, class line_maps *line_table) 304 { 305 pfile->line_table = line_table; 306 } 307 308 /* Free resources used by PFILE. Accessing PFILE after this function 309 returns leads to undefined behavior. Returns the error count. */ 310 void 311 cpp_destroy (cpp_reader *pfile) 312 { 313 cpp_context *context, *contextn; 314 struct def_pragma_macro *pmacro; 315 tokenrun *run, *runn; 316 int i; 317 318 free (pfile->op_stack); 319 320 while (CPP_BUFFER (pfile) != NULL) 321 _cpp_pop_buffer (pfile); 322 323 free (pfile->out.base); 324 325 if (pfile->macro_buffer) 326 { 327 free (pfile->macro_buffer); 328 pfile->macro_buffer = NULL; 329 pfile->macro_buffer_len = 0; 330 } 331 332 if (pfile->deps) 333 deps_free (pfile->deps); 334 obstack_free (&pfile->buffer_ob, 0); 335 336 _cpp_destroy_hashtable (pfile); 337 _cpp_cleanup_files (pfile); 338 _cpp_destroy_iconv (pfile); 339 340 _cpp_free_buff (pfile->a_buff); 341 _cpp_free_buff (pfile->u_buff); 342 _cpp_free_buff (pfile->free_buffs); 343 344 for (run = &pfile->base_run; run; run = runn) 345 { 346 runn = run->next; 347 free (run->base); 348 if (run != &pfile->base_run) 349 free (run); 350 } 351 352 for (context = pfile->base_context.next; context; context = contextn) 353 { 354 contextn = context->next; 355 free (context); 356 } 357 358 if (pfile->comments.entries) 359 { 360 for (i = 0; i < pfile->comments.count; i++) 361 free (pfile->comments.entries[i].comment); 362 363 free (pfile->comments.entries); 364 } 365 if (pfile->pushed_macros) 366 { 367 do 368 { 369 pmacro = pfile->pushed_macros; 370 pfile->pushed_macros = pmacro->next; 371 free (pmacro->name); 372 free (pmacro); 373 } 374 while (pfile->pushed_macros); 375 } 376 377 free (pfile); 378 } 379 380 /* This structure defines one built-in identifier. A node will be 381 entered in the hash table under the name NAME, with value VALUE. 382 383 There are two tables of these. builtin_array holds all the 384 "builtin" macros: these are handled by builtin_macro() in 385 macro.cc. Builtin is somewhat of a misnomer -- the property of 386 interest is that these macros require special code to compute their 387 expansions. The value is a "cpp_builtin_type" enumerator. 388 389 operator_array holds the C++ named operators. These are keywords 390 which act as aliases for punctuators. In C++, they cannot be 391 altered through #define, and #if recognizes them as operators. In 392 C, these are not entered into the hash table at all (but see 393 <iso646.h>). The value is a token-type enumerator. */ 394 struct builtin_macro 395 { 396 const uchar *const name; 397 const unsigned short len; 398 const unsigned short value; 399 const bool always_warn_if_redefined; 400 }; 401 402 #define B(n, t, f) { DSC(n), t, f } 403 static const struct builtin_macro builtin_array[] = 404 { 405 B("__TIMESTAMP__", BT_TIMESTAMP, false), 406 B("__TIME__", BT_TIME, false), 407 B("__DATE__", BT_DATE, false), 408 B("__FILE__", BT_FILE, false), 409 B("__FILE_NAME__", BT_FILE_NAME, false), 410 B("__BASE_FILE__", BT_BASE_FILE, false), 411 B("__LINE__", BT_SPECLINE, true), 412 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true), 413 B("__COUNTER__", BT_COUNTER, true), 414 /* Make sure to update the list of built-in 415 function-like macros in traditional.cc: 416 fun_like_macro() when adding more following */ 417 B("__has_attribute", BT_HAS_ATTRIBUTE, true), 418 B("__has_c_attribute", BT_HAS_STD_ATTRIBUTE, true), 419 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true), 420 B("__has_builtin", BT_HAS_BUILTIN, true), 421 B("__has_include", BT_HAS_INCLUDE, true), 422 B("__has_include_next",BT_HAS_INCLUDE_NEXT, true), 423 /* Keep builtins not used for -traditional-cpp at the end, and 424 update init_builtins() if any more are added. */ 425 B("_Pragma", BT_PRAGMA, true), 426 B("__STDC__", BT_STDC, true), 427 }; 428 #undef B 429 430 struct builtin_operator 431 { 432 const uchar *const name; 433 const unsigned short len; 434 const unsigned short value; 435 }; 436 437 #define B(n, t) { DSC(n), t } 438 static const struct builtin_operator operator_array[] = 439 { 440 B("and", CPP_AND_AND), 441 B("and_eq", CPP_AND_EQ), 442 B("bitand", CPP_AND), 443 B("bitor", CPP_OR), 444 B("compl", CPP_COMPL), 445 B("not", CPP_NOT), 446 B("not_eq", CPP_NOT_EQ), 447 B("or", CPP_OR_OR), 448 B("or_eq", CPP_OR_EQ), 449 B("xor", CPP_XOR), 450 B("xor_eq", CPP_XOR_EQ) 451 }; 452 #undef B 453 454 /* Mark the C++ named operators in the hash table. */ 455 static void 456 mark_named_operators (cpp_reader *pfile, int flags) 457 { 458 const struct builtin_operator *b; 459 460 for (b = operator_array; 461 b < (operator_array + ARRAY_SIZE (operator_array)); 462 b++) 463 { 464 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 465 hp->flags |= flags; 466 hp->is_directive = 0; 467 hp->directive_index = b->value; 468 } 469 } 470 471 /* Helper function of cpp_type2name. Return the string associated with 472 named operator TYPE. */ 473 const char * 474 cpp_named_operator2name (enum cpp_ttype type) 475 { 476 const struct builtin_operator *b; 477 478 for (b = operator_array; 479 b < (operator_array + ARRAY_SIZE (operator_array)); 480 b++) 481 { 482 if (type == b->value) 483 return (const char *) b->name; 484 } 485 486 return NULL; 487 } 488 489 void 490 cpp_init_special_builtins (cpp_reader *pfile) 491 { 492 const struct builtin_macro *b; 493 size_t n = ARRAY_SIZE (builtin_array); 494 495 if (CPP_OPTION (pfile, traditional)) 496 n -= 2; 497 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers) 498 || CPP_OPTION (pfile, std)) 499 n--; 500 501 for (b = builtin_array; b < builtin_array + n; b++) 502 { 503 if ((b->value == BT_HAS_ATTRIBUTE 504 || b->value == BT_HAS_STD_ATTRIBUTE 505 || b->value == BT_HAS_BUILTIN) 506 && (CPP_OPTION (pfile, lang) == CLK_ASM 507 || pfile->cb.has_attribute == NULL)) 508 continue; 509 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 510 hp->type = NT_BUILTIN_MACRO; 511 if (b->always_warn_if_redefined) 512 hp->flags |= NODE_WARN; 513 hp->value.builtin = (enum cpp_builtin_type) b->value; 514 } 515 } 516 517 /* Restore macro C to builtin macro definition. */ 518 519 void 520 _cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c) 521 { 522 size_t len = strlen (c->name); 523 524 for (const struct builtin_macro *b = builtin_array; 525 b < builtin_array + ARRAY_SIZE (builtin_array); b++) 526 if (b->len == len && memcmp (c->name, b->name, len + 1) == 0) 527 { 528 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 529 hp->type = NT_BUILTIN_MACRO; 530 if (b->always_warn_if_redefined) 531 hp->flags |= NODE_WARN; 532 hp->value.builtin = (enum cpp_builtin_type) b->value; 533 } 534 } 535 536 /* Read the builtins table above and enter them, and language-specific 537 macros, into the hash table. HOSTED is true if this is a hosted 538 environment. */ 539 void 540 cpp_init_builtins (cpp_reader *pfile, int hosted) 541 { 542 cpp_init_special_builtins (pfile); 543 544 if (!CPP_OPTION (pfile, traditional) 545 && (! CPP_OPTION (pfile, stdc_0_in_system_headers) 546 || CPP_OPTION (pfile, std))) 547 _cpp_define_builtin (pfile, "__STDC__ 1"); 548 549 if (CPP_OPTION (pfile, cplusplus)) 550 { 551 /* C++23 is not yet a standard. For now, use an invalid 552 * year/month, 202100L, which is larger than 202002L. */ 553 if (CPP_OPTION (pfile, lang) == CLK_CXX23 554 || CPP_OPTION (pfile, lang) == CLK_GNUCXX23) 555 _cpp_define_builtin (pfile, "__cplusplus 202100L"); 556 else if (CPP_OPTION (pfile, lang) == CLK_CXX20 557 || CPP_OPTION (pfile, lang) == CLK_GNUCXX20) 558 _cpp_define_builtin (pfile, "__cplusplus 202002L"); 559 else if (CPP_OPTION (pfile, lang) == CLK_CXX17 560 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17) 561 _cpp_define_builtin (pfile, "__cplusplus 201703L"); 562 else if (CPP_OPTION (pfile, lang) == CLK_CXX14 563 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14) 564 _cpp_define_builtin (pfile, "__cplusplus 201402L"); 565 else if (CPP_OPTION (pfile, lang) == CLK_CXX11 566 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11) 567 _cpp_define_builtin (pfile, "__cplusplus 201103L"); 568 else 569 _cpp_define_builtin (pfile, "__cplusplus 199711L"); 570 } 571 else if (CPP_OPTION (pfile, lang) == CLK_ASM) 572 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1"); 573 else if (CPP_OPTION (pfile, lang) == CLK_STDC94) 574 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L"); 575 else if (CPP_OPTION (pfile, lang) == CLK_STDC2X 576 || CPP_OPTION (pfile, lang) == CLK_GNUC2X) 577 _cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L"); 578 else if (CPP_OPTION (pfile, lang) == CLK_STDC17 579 || CPP_OPTION (pfile, lang) == CLK_GNUC17) 580 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L"); 581 else if (CPP_OPTION (pfile, lang) == CLK_STDC11 582 || CPP_OPTION (pfile, lang) == CLK_GNUC11) 583 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L"); 584 else if (CPP_OPTION (pfile, c99)) 585 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L"); 586 587 if (CPP_OPTION (pfile, uliterals) 588 && !(CPP_OPTION (pfile, cplusplus) 589 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX 590 || CPP_OPTION (pfile, lang) == CLK_CXX98))) 591 { 592 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1"); 593 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1"); 594 } 595 596 if (hosted) 597 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1"); 598 else 599 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0"); 600 601 if (CPP_OPTION (pfile, objc)) 602 _cpp_define_builtin (pfile, "__OBJC__ 1"); 603 } 604 605 /* Sanity-checks are dependent on command-line options, so it is 606 called as a subroutine of cpp_read_main_file. */ 607 #if CHECKING_P 608 static void sanity_checks (cpp_reader *); 609 static void sanity_checks (cpp_reader *pfile) 610 { 611 cppchar_t test = 0; 612 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part); 613 614 /* Sanity checks for assumptions about CPP arithmetic and target 615 type precisions made by cpplib. */ 616 test--; 617 if (test < 1) 618 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type"); 619 620 if (CPP_OPTION (pfile, precision) > max_precision) 621 cpp_error (pfile, CPP_DL_ICE, 622 "preprocessor arithmetic has maximum precision of %lu bits;" 623 " target requires %lu bits", 624 (unsigned long) max_precision, 625 (unsigned long) CPP_OPTION (pfile, precision)); 626 627 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision)) 628 cpp_error (pfile, CPP_DL_ICE, 629 "CPP arithmetic must be at least as precise as a target int"); 630 631 if (CPP_OPTION (pfile, char_precision) < 8) 632 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide"); 633 634 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision)) 635 cpp_error (pfile, CPP_DL_ICE, 636 "target wchar_t is narrower than target char"); 637 638 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision)) 639 cpp_error (pfile, CPP_DL_ICE, 640 "target int is narrower than target char"); 641 642 /* This is assumed in eval_token() and could be fixed if necessary. */ 643 if (sizeof (cppchar_t) > sizeof (cpp_num_part)) 644 cpp_error (pfile, CPP_DL_ICE, 645 "CPP half-integer narrower than CPP character"); 646 647 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T) 648 cpp_error (pfile, CPP_DL_ICE, 649 "CPP on this host cannot handle wide character constants over" 650 " %lu bits, but the target requires %lu bits", 651 (unsigned long) BITS_PER_CPPCHAR_T, 652 (unsigned long) CPP_OPTION (pfile, wchar_precision)); 653 } 654 #else 655 # define sanity_checks(PFILE) 656 #endif 657 658 /* This is called after options have been parsed, and partially 659 processed. */ 660 void 661 cpp_post_options (cpp_reader *pfile) 662 { 663 int flags; 664 665 sanity_checks (pfile); 666 667 post_options (pfile); 668 669 /* Mark named operators before handling command line macros. */ 670 flags = 0; 671 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names)) 672 flags |= NODE_OPERATOR; 673 if (CPP_OPTION (pfile, warn_cxx_operator_names)) 674 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR; 675 if (flags != 0) 676 mark_named_operators (pfile, flags); 677 } 678 679 /* Setup for processing input from the file named FNAME, or stdin if 680 it is the empty string. Return the original filename on success 681 (e.g. foo.i->foo.c), or NULL on failure. INJECTING is true if 682 there may be injected headers before line 1 of the main file. */ 683 const char * 684 cpp_read_main_file (cpp_reader *pfile, const char *fname, bool injecting) 685 { 686 if (mkdeps *deps = cpp_get_deps (pfile)) 687 /* Set the default target (if there is none already). */ 688 deps_add_default_target (deps, fname); 689 690 pfile->main_file 691 = _cpp_find_file (pfile, fname, 692 CPP_OPTION (pfile, preprocessed) ? &pfile->no_search_path 693 : CPP_OPTION (pfile, main_search) == CMS_user 694 ? pfile->quote_include 695 : CPP_OPTION (pfile, main_search) == CMS_system 696 ? pfile->bracket_include : &pfile->no_search_path, 697 /*angle=*/0, _cpp_FFK_NORMAL, 0); 698 699 if (_cpp_find_failed (pfile->main_file)) 700 return NULL; 701 702 _cpp_stack_file (pfile, pfile->main_file, 703 injecting || CPP_OPTION (pfile, preprocessed) 704 ? IT_PRE_MAIN : IT_MAIN, 0); 705 706 /* For foo.i, read the original filename foo.c now, for the benefit 707 of the front ends. */ 708 if (CPP_OPTION (pfile, preprocessed)) 709 if (!read_original_filename (pfile)) 710 { 711 /* We're on line 1 after all. */ 712 auto *last = linemap_check_ordinary 713 (LINEMAPS_LAST_MAP (pfile->line_table, false)); 714 last->to_line = 1; 715 /* Inform of as-if a file change. */ 716 _cpp_do_file_change (pfile, LC_RENAME_VERBATIM, LINEMAP_FILE (last), 717 LINEMAP_LINE (last), LINEMAP_SYSP (last)); 718 } 719 720 auto *map = LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table); 721 pfile->main_loc = MAP_START_LOCATION (map); 722 723 return ORDINARY_MAP_FILE_NAME (map); 724 } 725 726 location_t 727 cpp_main_loc (const cpp_reader *pfile) 728 { 729 return pfile->main_loc; 730 } 731 732 /* For preprocessed files, if the very first characters are 733 '#<SPACE>[01]<SPACE>', then handle a line directive so we know the 734 original file name. This will generate file_change callbacks, 735 which the front ends must handle appropriately given their state of 736 initialization. We peek directly into the character buffer, so 737 that we're not confused by otherwise-skipped white space & 738 comments. We can be very picky, because this should have been 739 machine-generated text (by us, no less). This way we do not 740 interfere with the module directive state machine. */ 741 742 static bool 743 read_original_filename (cpp_reader *pfile) 744 { 745 auto *buf = pfile->buffer->next_line; 746 747 if (pfile->buffer->rlimit - buf > 4 748 && buf[0] == '#' 749 && buf[1] == ' ' 750 // Also permit '1', as that's what used to be here 751 && (buf[2] == '0' || buf[2] == '1') 752 && buf[3] == ' ') 753 { 754 const cpp_token *token = _cpp_lex_direct (pfile); 755 gcc_checking_assert (token->type == CPP_HASH); 756 if (_cpp_handle_directive (pfile, token->flags & PREV_WHITE)) 757 { 758 read_original_directory (pfile); 759 760 auto *penult = &linemap_check_ordinary 761 (LINEMAPS_LAST_MAP (pfile->line_table, false))[-1]; 762 if (penult[1].reason == LC_RENAME_VERBATIM) 763 { 764 /* Expunge any evidence of the original linemap. */ 765 pfile->line_table->highest_location 766 = pfile->line_table->highest_line 767 = penult[0].start_location; 768 769 penult[1].start_location = penult[0].start_location; 770 penult[1].reason = penult[0].reason; 771 penult[0] = penult[1]; 772 pfile->line_table->info_ordinary.used--; 773 pfile->line_table->info_ordinary.cache = 0; 774 } 775 776 return true; 777 } 778 } 779 780 return false; 781 } 782 783 /* For preprocessed files, if the tokens following the first filename 784 line is of the form # <line> "/path/name//", handle the 785 directive so we know the original current directory. 786 787 As with the first line peeking, we can do this without lexing by 788 being picky. */ 789 static void 790 read_original_directory (cpp_reader *pfile) 791 { 792 auto *buf = pfile->buffer->next_line; 793 794 if (pfile->buffer->rlimit - buf > 4 795 && buf[0] == '#' 796 && buf[1] == ' ' 797 // Also permit '1', as that's what used to be here 798 && (buf[2] == '0' || buf[2] == '1') 799 && buf[3] == ' ') 800 { 801 const cpp_token *hash = _cpp_lex_direct (pfile); 802 gcc_checking_assert (hash->type == CPP_HASH); 803 pfile->state.in_directive = 1; 804 const cpp_token *number = _cpp_lex_direct (pfile); 805 gcc_checking_assert (number->type == CPP_NUMBER); 806 const cpp_token *string = _cpp_lex_direct (pfile); 807 pfile->state.in_directive = 0; 808 809 const unsigned char *text = nullptr; 810 size_t len = 0; 811 if (string->type == CPP_STRING) 812 { 813 /* The string value includes the quotes. */ 814 text = string->val.str.text; 815 len = string->val.str.len; 816 } 817 if (len < 5 818 || !IS_DIR_SEPARATOR (text[len - 2]) 819 || !IS_DIR_SEPARATOR (text[len - 3])) 820 { 821 /* That didn't work out, back out. */ 822 _cpp_backup_tokens (pfile, 3); 823 return; 824 } 825 826 if (pfile->cb.dir_change) 827 { 828 /* Smash the string directly, it's dead at this point */ 829 char *smashy = (char *)text; 830 smashy[len - 3] = 0; 831 832 pfile->cb.dir_change (pfile, smashy + 1); 833 } 834 835 /* We should be at EOL. */ 836 } 837 } 838 839 /* This is called at the end of preprocessing. It pops the last 840 buffer and writes dependency output. 841 842 Maybe it should also reset state, such that you could call 843 cpp_start_read with a new filename to restart processing. */ 844 void 845 cpp_finish (cpp_reader *pfile, FILE *deps_stream) 846 { 847 /* Warn about unused macros before popping the final buffer. */ 848 if (CPP_OPTION (pfile, warn_unused_macros)) 849 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL); 850 851 /* lex.cc leaves the final buffer on the stack. This it so that 852 it returns an unending stream of CPP_EOFs to the client. If we 853 popped the buffer, we'd dereference a NULL buffer pointer and 854 segfault. It's nice to allow the client to do worry-free excess 855 cpp_get_token calls. */ 856 while (pfile->buffer) 857 _cpp_pop_buffer (pfile); 858 859 if (deps_stream) 860 deps_write (pfile, deps_stream, 72); 861 862 /* Report on headers that could use multiple include guards. */ 863 if (CPP_OPTION (pfile, print_include_names)) 864 _cpp_report_missing_guards (pfile); 865 } 866 867 static void 868 post_options (cpp_reader *pfile) 869 { 870 /* -Wtraditional is not useful in C++ mode. */ 871 if (CPP_OPTION (pfile, cplusplus)) 872 CPP_OPTION (pfile, cpp_warn_traditional) = 0; 873 874 /* Permanently disable macro expansion if we are rescanning 875 preprocessed text. Read preprocesed source in ISO mode. */ 876 if (CPP_OPTION (pfile, preprocessed)) 877 { 878 if (!CPP_OPTION (pfile, directives_only)) 879 pfile->state.prevent_expansion = 1; 880 CPP_OPTION (pfile, traditional) = 0; 881 } 882 883 if (CPP_OPTION (pfile, warn_trigraphs) == 2) 884 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs); 885 886 if (CPP_OPTION (pfile, traditional)) 887 { 888 CPP_OPTION (pfile, trigraphs) = 0; 889 CPP_OPTION (pfile, warn_trigraphs) = 0; 890 } 891 892 if (CPP_OPTION (pfile, module_directives)) 893 { 894 /* These unspellable tokens have a leading space. */ 895 const char *const inits[spec_nodes::M_HWM] 896 = {"export ", "module ", "import ", "__import"}; 897 898 for (int ix = 0; ix != spec_nodes::M_HWM; ix++) 899 { 900 cpp_hashnode *node = cpp_lookup (pfile, UC (inits[ix]), 901 strlen (inits[ix])); 902 903 /* Token we pass to the compiler. */ 904 pfile->spec_nodes.n_modules[ix][1] = node; 905 906 if (ix != spec_nodes::M__IMPORT) 907 /* Token we recognize when lexing, drop the trailing ' '. */ 908 node = cpp_lookup (pfile, NODE_NAME (node), NODE_LEN (node) - 1); 909 910 node->flags |= NODE_MODULE; 911 pfile->spec_nodes.n_modules[ix][0] = node; 912 } 913 } 914 } 915