1 /* CPP Library. 2 Copyright (C) 1986-2019 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 void 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 }; 96 97 static const struct lang_flags lang_defaults[] = 98 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt */ 99 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1 }, 100 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1 }, 101 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1 }, 102 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1 }, 103 /* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1 }, 104 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, 105 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 }, 106 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 }, 107 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0 }, 108 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0 }, 109 /* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0 }, 110 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1 }, 111 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 }, 112 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1 }, 113 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0 }, 114 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1 }, 115 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0 }, 116 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1 }, 117 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0 }, 118 /* GNUCXX2A */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1 }, 119 /* CXX2A */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1 }, 120 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } 121 }; 122 123 /* Sets internal flags correctly for a given language. */ 124 void 125 cpp_set_lang (cpp_reader *pfile, enum c_lang lang) 126 { 127 const struct lang_flags *l = &lang_defaults[(int) lang]; 128 129 CPP_OPTION (pfile, lang) = lang; 130 131 CPP_OPTION (pfile, c99) = l->c99; 132 CPP_OPTION (pfile, cplusplus) = l->cplusplus; 133 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers; 134 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers; 135 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers; 136 CPP_OPTION (pfile, std) = l->std; 137 CPP_OPTION (pfile, digraphs) = l->digraphs; 138 CPP_OPTION (pfile, uliterals) = l->uliterals; 139 CPP_OPTION (pfile, rliterals) = l->rliterals; 140 CPP_OPTION (pfile, user_literals) = l->user_literals; 141 CPP_OPTION (pfile, binary_constants) = l->binary_constants; 142 CPP_OPTION (pfile, digit_separators) = l->digit_separators; 143 CPP_OPTION (pfile, trigraphs) = l->trigraphs; 144 CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals; 145 CPP_OPTION (pfile, va_opt) = l->va_opt; 146 } 147 148 /* Initialize library global state. */ 149 static void 150 init_library (void) 151 { 152 static int initialized = 0; 153 154 if (! initialized) 155 { 156 initialized = 1; 157 158 _cpp_init_lexer (); 159 160 /* Set up the trigraph map. This doesn't need to do anything if 161 we were compiled with a compiler that supports C99 designated 162 initializers. */ 163 init_trigraph_map (); 164 165 #ifdef ENABLE_NLS 166 (void) bindtextdomain (PACKAGE, LOCALEDIR); 167 #endif 168 } 169 } 170 171 /* Initialize a cpp_reader structure. */ 172 cpp_reader * 173 cpp_create_reader (enum c_lang lang, cpp_hash_table *table, 174 struct line_maps *line_table) 175 { 176 cpp_reader *pfile; 177 178 /* Initialize this instance of the library if it hasn't been already. */ 179 init_library (); 180 181 pfile = XCNEW (cpp_reader); 182 memset (&pfile->base_context, 0, sizeof (pfile->base_context)); 183 184 cpp_set_lang (pfile, lang); 185 CPP_OPTION (pfile, warn_multichar) = 1; 186 CPP_OPTION (pfile, discard_comments) = 1; 187 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1; 188 CPP_OPTION (pfile, tabstop) = 8; 189 CPP_OPTION (pfile, operator_names) = 1; 190 CPP_OPTION (pfile, warn_trigraphs) = 2; 191 CPP_OPTION (pfile, warn_endif_labels) = 1; 192 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1; 193 CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0; 194 CPP_OPTION (pfile, cpp_warn_deprecated) = 1; 195 CPP_OPTION (pfile, cpp_warn_long_long) = 0; 196 CPP_OPTION (pfile, dollars_in_ident) = 1; 197 CPP_OPTION (pfile, warn_dollars) = 1; 198 CPP_OPTION (pfile, warn_variadic_macros) = 1; 199 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1; 200 CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0; 201 /* By default, track locations of tokens resulting from macro 202 expansion. The '2' means, track the locations with the highest 203 accuracy. Read the comments for struct 204 cpp_options::track_macro_expansion to learn about the other 205 values. */ 206 CPP_OPTION (pfile, track_macro_expansion) = 2; 207 CPP_OPTION (pfile, warn_normalize) = normalized_C; 208 CPP_OPTION (pfile, warn_literal_suffix) = 1; 209 CPP_OPTION (pfile, canonical_system_headers) 210 = ENABLE_CANONICAL_SYSTEM_HEADERS; 211 CPP_OPTION (pfile, ext_numeric_literals) = 1; 212 CPP_OPTION (pfile, warn_date_time) = 0; 213 214 /* Default CPP arithmetic to something sensible for the host for the 215 benefit of dumb users like fix-header. */ 216 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long); 217 CPP_OPTION (pfile, char_precision) = CHAR_BIT; 218 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int); 219 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int); 220 CPP_OPTION (pfile, unsigned_char) = 0; 221 CPP_OPTION (pfile, unsigned_wchar) = 1; 222 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */ 223 224 /* Default to no charset conversion. */ 225 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding (); 226 CPP_OPTION (pfile, wide_charset) = 0; 227 228 /* Default the input character set to UTF-8. */ 229 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding (); 230 231 /* A fake empty "directory" used as the starting point for files 232 looked up without a search path. Name cannot be '/' because we 233 don't want to prepend anything at all to filenames using it. All 234 other entries are correct zero-initialized. */ 235 pfile->no_search_path.name = (char *) ""; 236 237 /* Initialize the line map. */ 238 pfile->line_table = line_table; 239 240 /* Initialize lexer state. */ 241 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); 242 243 /* Set up static tokens. */ 244 pfile->avoid_paste.type = CPP_PADDING; 245 pfile->avoid_paste.val.source = NULL; 246 pfile->eof.type = CPP_EOF; 247 pfile->eof.flags = 0; 248 249 /* Create a token buffer for the lexer. */ 250 _cpp_init_tokenrun (&pfile->base_run, 250); 251 pfile->cur_run = &pfile->base_run; 252 pfile->cur_token = pfile->base_run.base; 253 254 /* Initialize the base context. */ 255 pfile->context = &pfile->base_context; 256 pfile->base_context.c.macro = 0; 257 pfile->base_context.prev = pfile->base_context.next = 0; 258 259 /* Aligned and unaligned storage. */ 260 pfile->a_buff = _cpp_get_buff (pfile, 0); 261 pfile->u_buff = _cpp_get_buff (pfile, 0); 262 263 /* Initialize table for push_macro/pop_macro. */ 264 pfile->pushed_macros = 0; 265 266 /* Do not force token locations by default. */ 267 pfile->forced_token_location = 0; 268 269 /* Initialize source_date_epoch to -2 (not yet set). */ 270 pfile->source_date_epoch = (time_t) -2; 271 272 /* The expression parser stack. */ 273 _cpp_expand_op_stack (pfile); 274 275 /* Initialize the buffer obstack. */ 276 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free); 277 278 _cpp_init_files (pfile); 279 280 _cpp_init_hashtable (pfile, table); 281 282 return pfile; 283 } 284 285 /* Set the line_table entry in PFILE. This is called after reading a 286 PCH file, as the old line_table will be incorrect. */ 287 void 288 cpp_set_line_map (cpp_reader *pfile, struct line_maps *line_table) 289 { 290 pfile->line_table = line_table; 291 } 292 293 /* Free resources used by PFILE. Accessing PFILE after this function 294 returns leads to undefined behavior. Returns the error count. */ 295 void 296 cpp_destroy (cpp_reader *pfile) 297 { 298 cpp_context *context, *contextn; 299 struct def_pragma_macro *pmacro; 300 tokenrun *run, *runn; 301 int i; 302 303 free (pfile->op_stack); 304 305 while (CPP_BUFFER (pfile) != NULL) 306 _cpp_pop_buffer (pfile); 307 308 free (pfile->out.base); 309 310 if (pfile->macro_buffer) 311 { 312 free (pfile->macro_buffer); 313 pfile->macro_buffer = NULL; 314 pfile->macro_buffer_len = 0; 315 } 316 317 if (pfile->deps) 318 deps_free (pfile->deps); 319 obstack_free (&pfile->buffer_ob, 0); 320 321 _cpp_destroy_hashtable (pfile); 322 _cpp_cleanup_files (pfile); 323 _cpp_destroy_iconv (pfile); 324 325 _cpp_free_buff (pfile->a_buff); 326 _cpp_free_buff (pfile->u_buff); 327 _cpp_free_buff (pfile->free_buffs); 328 329 for (run = &pfile->base_run; run; run = runn) 330 { 331 runn = run->next; 332 free (run->base); 333 if (run != &pfile->base_run) 334 free (run); 335 } 336 337 for (context = pfile->base_context.next; context; context = contextn) 338 { 339 contextn = context->next; 340 free (context); 341 } 342 343 if (pfile->comments.entries) 344 { 345 for (i = 0; i < pfile->comments.count; i++) 346 free (pfile->comments.entries[i].comment); 347 348 free (pfile->comments.entries); 349 } 350 if (pfile->pushed_macros) 351 { 352 do 353 { 354 pmacro = pfile->pushed_macros; 355 pfile->pushed_macros = pmacro->next; 356 free (pmacro->name); 357 free (pmacro); 358 } 359 while (pfile->pushed_macros); 360 } 361 362 free (pfile); 363 } 364 365 /* This structure defines one built-in identifier. A node will be 366 entered in the hash table under the name NAME, with value VALUE. 367 368 There are two tables of these. builtin_array holds all the 369 "builtin" macros: these are handled by builtin_macro() in 370 macro.c. Builtin is somewhat of a misnomer -- the property of 371 interest is that these macros require special code to compute their 372 expansions. The value is a "cpp_builtin_type" enumerator. 373 374 operator_array holds the C++ named operators. These are keywords 375 which act as aliases for punctuators. In C++, they cannot be 376 altered through #define, and #if recognizes them as operators. In 377 C, these are not entered into the hash table at all (but see 378 <iso646.h>). The value is a token-type enumerator. */ 379 struct builtin_macro 380 { 381 const uchar *const name; 382 const unsigned short len; 383 const unsigned short value; 384 const bool always_warn_if_redefined; 385 }; 386 387 #define B(n, t, f) { DSC(n), t, f } 388 static const struct builtin_macro builtin_array[] = 389 { 390 B("__TIMESTAMP__", BT_TIMESTAMP, false), 391 B("__TIME__", BT_TIME, false), 392 B("__DATE__", BT_DATE, false), 393 B("__FILE__", BT_FILE, false), 394 B("__BASE_FILE__", BT_BASE_FILE, false), 395 B("__LINE__", BT_SPECLINE, true), 396 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true), 397 B("__COUNTER__", BT_COUNTER, true), 398 B("__has_attribute", BT_HAS_ATTRIBUTE, true), 399 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true), 400 /* Keep builtins not used for -traditional-cpp at the end, and 401 update init_builtins() if any more are added. */ 402 B("_Pragma", BT_PRAGMA, true), 403 B("__STDC__", BT_STDC, true), 404 }; 405 #undef B 406 407 struct builtin_operator 408 { 409 const uchar *const name; 410 const unsigned short len; 411 const unsigned short value; 412 }; 413 414 #define B(n, t) { DSC(n), t } 415 static const struct builtin_operator operator_array[] = 416 { 417 B("and", CPP_AND_AND), 418 B("and_eq", CPP_AND_EQ), 419 B("bitand", CPP_AND), 420 B("bitor", CPP_OR), 421 B("compl", CPP_COMPL), 422 B("not", CPP_NOT), 423 B("not_eq", CPP_NOT_EQ), 424 B("or", CPP_OR_OR), 425 B("or_eq", CPP_OR_EQ), 426 B("xor", CPP_XOR), 427 B("xor_eq", CPP_XOR_EQ) 428 }; 429 #undef B 430 431 /* Mark the C++ named operators in the hash table. */ 432 static void 433 mark_named_operators (cpp_reader *pfile, int flags) 434 { 435 const struct builtin_operator *b; 436 437 for (b = operator_array; 438 b < (operator_array + ARRAY_SIZE (operator_array)); 439 b++) 440 { 441 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 442 hp->flags |= flags; 443 hp->is_directive = 0; 444 hp->directive_index = b->value; 445 } 446 } 447 448 /* Helper function of cpp_type2name. Return the string associated with 449 named operator TYPE. */ 450 const char * 451 cpp_named_operator2name (enum cpp_ttype type) 452 { 453 const struct builtin_operator *b; 454 455 for (b = operator_array; 456 b < (operator_array + ARRAY_SIZE (operator_array)); 457 b++) 458 { 459 if (type == b->value) 460 return (const char *) b->name; 461 } 462 463 return NULL; 464 } 465 466 void 467 cpp_init_special_builtins (cpp_reader *pfile) 468 { 469 const struct builtin_macro *b; 470 size_t n = ARRAY_SIZE (builtin_array); 471 472 if (CPP_OPTION (pfile, traditional)) 473 n -= 2; 474 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers) 475 || CPP_OPTION (pfile, std)) 476 n--; 477 478 for (b = builtin_array; b < builtin_array + n; b++) 479 { 480 if (b->value == BT_HAS_ATTRIBUTE 481 && (CPP_OPTION (pfile, lang) == CLK_ASM 482 || pfile->cb.has_attribute == NULL)) 483 continue; 484 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 485 hp->type = NT_BUILTIN_MACRO; 486 if (b->always_warn_if_redefined) 487 hp->flags |= NODE_WARN; 488 hp->value.builtin = (enum cpp_builtin_type) b->value; 489 } 490 } 491 492 /* Restore macro C to builtin macro definition. */ 493 494 void 495 _cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c) 496 { 497 size_t len = strlen (c->name); 498 499 for (const struct builtin_macro *b = builtin_array; 500 b < builtin_array + ARRAY_SIZE (builtin_array); b++) 501 if (b->len == len && memcmp (c->name, b->name, len + 1) == 0) 502 { 503 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 504 hp->type = NT_BUILTIN_MACRO; 505 if (b->always_warn_if_redefined) 506 hp->flags |= NODE_WARN; 507 hp->value.builtin = (enum cpp_builtin_type) b->value; 508 } 509 } 510 511 /* Read the builtins table above and enter them, and language-specific 512 macros, into the hash table. HOSTED is true if this is a hosted 513 environment. */ 514 void 515 cpp_init_builtins (cpp_reader *pfile, int hosted) 516 { 517 cpp_init_special_builtins (pfile); 518 519 if (!CPP_OPTION (pfile, traditional) 520 && (! CPP_OPTION (pfile, stdc_0_in_system_headers) 521 || CPP_OPTION (pfile, std))) 522 _cpp_define_builtin (pfile, "__STDC__ 1"); 523 524 if (CPP_OPTION (pfile, cplusplus)) 525 { 526 if (CPP_OPTION (pfile, lang) == CLK_CXX2A 527 || CPP_OPTION (pfile, lang) == CLK_GNUCXX2A) 528 _cpp_define_builtin (pfile, "__cplusplus 201709L"); 529 else if (CPP_OPTION (pfile, lang) == CLK_CXX17 530 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17) 531 _cpp_define_builtin (pfile, "__cplusplus 201703L"); 532 else if (CPP_OPTION (pfile, lang) == CLK_CXX14 533 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14) 534 _cpp_define_builtin (pfile, "__cplusplus 201402L"); 535 else if (CPP_OPTION (pfile, lang) == CLK_CXX11 536 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11) 537 _cpp_define_builtin (pfile, "__cplusplus 201103L"); 538 else 539 _cpp_define_builtin (pfile, "__cplusplus 199711L"); 540 } 541 else if (CPP_OPTION (pfile, lang) == CLK_ASM) 542 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1"); 543 else if (CPP_OPTION (pfile, lang) == CLK_STDC94) 544 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L"); 545 else if (CPP_OPTION (pfile, lang) == CLK_STDC2X 546 || CPP_OPTION (pfile, lang) == CLK_GNUC2X) 547 _cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L"); 548 else if (CPP_OPTION (pfile, lang) == CLK_STDC17 549 || CPP_OPTION (pfile, lang) == CLK_GNUC17) 550 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L"); 551 else if (CPP_OPTION (pfile, lang) == CLK_STDC11 552 || CPP_OPTION (pfile, lang) == CLK_GNUC11) 553 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L"); 554 else if (CPP_OPTION (pfile, c99)) 555 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L"); 556 557 if (CPP_OPTION (pfile, uliterals) 558 && !(CPP_OPTION (pfile, cplusplus) 559 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX 560 || CPP_OPTION (pfile, lang) == CLK_CXX98))) 561 { 562 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1"); 563 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1"); 564 } 565 566 if (hosted) 567 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1"); 568 else 569 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0"); 570 571 if (CPP_OPTION (pfile, objc)) 572 _cpp_define_builtin (pfile, "__OBJC__ 1"); 573 } 574 575 /* Sanity-checks are dependent on command-line options, so it is 576 called as a subroutine of cpp_read_main_file. */ 577 #if CHECKING_P 578 static void sanity_checks (cpp_reader *); 579 static void sanity_checks (cpp_reader *pfile) 580 { 581 cppchar_t test = 0; 582 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part); 583 584 /* Sanity checks for assumptions about CPP arithmetic and target 585 type precisions made by cpplib. */ 586 test--; 587 if (test < 1) 588 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type"); 589 590 if (CPP_OPTION (pfile, precision) > max_precision) 591 cpp_error (pfile, CPP_DL_ICE, 592 "preprocessor arithmetic has maximum precision of %lu bits;" 593 " target requires %lu bits", 594 (unsigned long) max_precision, 595 (unsigned long) CPP_OPTION (pfile, precision)); 596 597 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision)) 598 cpp_error (pfile, CPP_DL_ICE, 599 "CPP arithmetic must be at least as precise as a target int"); 600 601 if (CPP_OPTION (pfile, char_precision) < 8) 602 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide"); 603 604 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision)) 605 cpp_error (pfile, CPP_DL_ICE, 606 "target wchar_t is narrower than target char"); 607 608 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision)) 609 cpp_error (pfile, CPP_DL_ICE, 610 "target int is narrower than target char"); 611 612 /* This is assumed in eval_token() and could be fixed if necessary. */ 613 if (sizeof (cppchar_t) > sizeof (cpp_num_part)) 614 cpp_error (pfile, CPP_DL_ICE, 615 "CPP half-integer narrower than CPP character"); 616 617 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T) 618 cpp_error (pfile, CPP_DL_ICE, 619 "CPP on this host cannot handle wide character constants over" 620 " %lu bits, but the target requires %lu bits", 621 (unsigned long) BITS_PER_CPPCHAR_T, 622 (unsigned long) CPP_OPTION (pfile, wchar_precision)); 623 } 624 #else 625 # define sanity_checks(PFILE) 626 #endif 627 628 /* This is called after options have been parsed, and partially 629 processed. */ 630 void 631 cpp_post_options (cpp_reader *pfile) 632 { 633 int flags; 634 635 sanity_checks (pfile); 636 637 post_options (pfile); 638 639 /* Mark named operators before handling command line macros. */ 640 flags = 0; 641 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names)) 642 flags |= NODE_OPERATOR; 643 if (CPP_OPTION (pfile, warn_cxx_operator_names)) 644 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR; 645 if (flags != 0) 646 mark_named_operators (pfile, flags); 647 } 648 649 /* Setup for processing input from the file named FNAME, or stdin if 650 it is the empty string. Return the original filename 651 on success (e.g. foo.i->foo.c), or NULL on failure. */ 652 const char * 653 cpp_read_main_file (cpp_reader *pfile, const char *fname) 654 { 655 const location_t loc = 0; 656 657 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE) 658 { 659 if (!pfile->deps) 660 pfile->deps = deps_init (); 661 662 /* Set the default target (if there is none already). */ 663 deps_add_default_target (pfile->deps, fname); 664 } 665 666 pfile->main_file 667 = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0, false, 668 loc); 669 if (_cpp_find_failed (pfile->main_file)) 670 return NULL; 671 672 _cpp_stack_file (pfile, pfile->main_file, false, loc); 673 674 /* For foo.i, read the original filename foo.c now, for the benefit 675 of the front ends. */ 676 if (CPP_OPTION (pfile, preprocessed)) 677 { 678 read_original_filename (pfile); 679 fname = 680 ORDINARY_MAP_FILE_NAME 681 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table))); 682 } 683 return fname; 684 } 685 686 /* For preprocessed files, if the first tokens are of the form # NUM. 687 handle the directive so we know the original file name. This will 688 generate file_change callbacks, which the front ends must handle 689 appropriately given their state of initialization. */ 690 static void 691 read_original_filename (cpp_reader *pfile) 692 { 693 const cpp_token *token, *token1; 694 695 /* Lex ahead; if the first tokens are of the form # NUM, then 696 process the directive, otherwise back up. */ 697 token = _cpp_lex_direct (pfile); 698 if (token->type == CPP_HASH) 699 { 700 pfile->state.in_directive = 1; 701 token1 = _cpp_lex_direct (pfile); 702 _cpp_backup_tokens (pfile, 1); 703 pfile->state.in_directive = 0; 704 705 /* If it's a #line directive, handle it. */ 706 if (token1->type == CPP_NUMBER 707 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE)) 708 { 709 read_original_directory (pfile); 710 return; 711 } 712 } 713 714 /* Backup as if nothing happened. */ 715 _cpp_backup_tokens (pfile, 1); 716 } 717 718 /* For preprocessed files, if the tokens following the first filename 719 line is of the form # <line> "/path/name//", handle the 720 directive so we know the original current directory. */ 721 static void 722 read_original_directory (cpp_reader *pfile) 723 { 724 const cpp_token *hash, *token; 725 726 /* Lex ahead; if the first tokens are of the form # NUM, then 727 process the directive, otherwise back up. */ 728 hash = _cpp_lex_direct (pfile); 729 if (hash->type != CPP_HASH) 730 { 731 _cpp_backup_tokens (pfile, 1); 732 return; 733 } 734 735 token = _cpp_lex_direct (pfile); 736 737 if (token->type != CPP_NUMBER) 738 { 739 _cpp_backup_tokens (pfile, 2); 740 return; 741 } 742 743 token = _cpp_lex_direct (pfile); 744 745 if (token->type != CPP_STRING 746 || ! (token->val.str.len >= 5 747 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2]) 748 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3]))) 749 { 750 _cpp_backup_tokens (pfile, 3); 751 return; 752 } 753 754 if (pfile->cb.dir_change) 755 { 756 char *debugdir = (char *) alloca (token->val.str.len - 3); 757 758 memcpy (debugdir, (const char *) token->val.str.text + 1, 759 token->val.str.len - 4); 760 debugdir[token->val.str.len - 4] = '\0'; 761 762 pfile->cb.dir_change (pfile, debugdir); 763 } 764 } 765 766 /* This is called at the end of preprocessing. It pops the last 767 buffer and writes dependency output. 768 769 Maybe it should also reset state, such that you could call 770 cpp_start_read with a new filename to restart processing. */ 771 void 772 cpp_finish (cpp_reader *pfile, FILE *deps_stream) 773 { 774 /* Warn about unused macros before popping the final buffer. */ 775 if (CPP_OPTION (pfile, warn_unused_macros)) 776 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL); 777 778 /* lex.c leaves the final buffer on the stack. This it so that 779 it returns an unending stream of CPP_EOFs to the client. If we 780 popped the buffer, we'd dereference a NULL buffer pointer and 781 segfault. It's nice to allow the client to do worry-free excess 782 cpp_get_token calls. */ 783 while (pfile->buffer) 784 _cpp_pop_buffer (pfile); 785 786 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE 787 && deps_stream) 788 { 789 deps_write (pfile->deps, deps_stream, 72); 790 791 if (CPP_OPTION (pfile, deps.phony_targets)) 792 deps_phony_targets (pfile->deps, deps_stream); 793 } 794 795 /* Report on headers that could use multiple include guards. */ 796 if (CPP_OPTION (pfile, print_include_names)) 797 _cpp_report_missing_guards (pfile); 798 } 799 800 static void 801 post_options (cpp_reader *pfile) 802 { 803 /* -Wtraditional is not useful in C++ mode. */ 804 if (CPP_OPTION (pfile, cplusplus)) 805 CPP_OPTION (pfile, cpp_warn_traditional) = 0; 806 807 /* Permanently disable macro expansion if we are rescanning 808 preprocessed text. Read preprocesed source in ISO mode. */ 809 if (CPP_OPTION (pfile, preprocessed)) 810 { 811 if (!CPP_OPTION (pfile, directives_only)) 812 pfile->state.prevent_expansion = 1; 813 CPP_OPTION (pfile, traditional) = 0; 814 } 815 816 if (CPP_OPTION (pfile, warn_trigraphs) == 2) 817 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs); 818 819 if (CPP_OPTION (pfile, traditional)) 820 { 821 CPP_OPTION (pfile, trigraphs) = 0; 822 CPP_OPTION (pfile, warn_trigraphs) = 0; 823 } 824 } 825