1 /* CPP Library. 2 Copyright (C) 1986-2018 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 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, 104 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 }, 105 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 }, 106 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0 }, 107 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0 }, 108 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1 }, 109 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 }, 110 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1 }, 111 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0 }, 112 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1 }, 113 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0 }, 114 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1 }, 115 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0 }, 116 /* GNUCXX2A */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1 }, 117 /* CXX2A */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1 }, 118 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } 119 }; 120 121 /* Sets internal flags correctly for a given language. */ 122 void 123 cpp_set_lang (cpp_reader *pfile, enum c_lang lang) 124 { 125 const struct lang_flags *l = &lang_defaults[(int) lang]; 126 127 CPP_OPTION (pfile, lang) = lang; 128 129 CPP_OPTION (pfile, c99) = l->c99; 130 CPP_OPTION (pfile, cplusplus) = l->cplusplus; 131 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers; 132 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers; 133 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers; 134 CPP_OPTION (pfile, std) = l->std; 135 CPP_OPTION (pfile, digraphs) = l->digraphs; 136 CPP_OPTION (pfile, uliterals) = l->uliterals; 137 CPP_OPTION (pfile, rliterals) = l->rliterals; 138 CPP_OPTION (pfile, user_literals) = l->user_literals; 139 CPP_OPTION (pfile, binary_constants) = l->binary_constants; 140 CPP_OPTION (pfile, digit_separators) = l->digit_separators; 141 CPP_OPTION (pfile, trigraphs) = l->trigraphs; 142 CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals; 143 CPP_OPTION (pfile, va_opt) = l->va_opt; 144 } 145 146 /* Initialize library global state. */ 147 static void 148 init_library (void) 149 { 150 static int initialized = 0; 151 152 if (! initialized) 153 { 154 initialized = 1; 155 156 _cpp_init_lexer (); 157 158 /* Set up the trigraph map. This doesn't need to do anything if 159 we were compiled with a compiler that supports C99 designated 160 initializers. */ 161 init_trigraph_map (); 162 163 #ifdef ENABLE_NLS 164 (void) bindtextdomain (PACKAGE, LOCALEDIR); 165 #endif 166 } 167 } 168 169 /* Initialize a cpp_reader structure. */ 170 cpp_reader * 171 cpp_create_reader (enum c_lang lang, cpp_hash_table *table, 172 struct line_maps *line_table) 173 { 174 cpp_reader *pfile; 175 176 /* Initialize this instance of the library if it hasn't been already. */ 177 init_library (); 178 179 pfile = XCNEW (cpp_reader); 180 memset (&pfile->base_context, 0, sizeof (pfile->base_context)); 181 182 cpp_set_lang (pfile, lang); 183 CPP_OPTION (pfile, warn_multichar) = 1; 184 CPP_OPTION (pfile, discard_comments) = 1; 185 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1; 186 CPP_OPTION (pfile, tabstop) = 8; 187 CPP_OPTION (pfile, operator_names) = 1; 188 CPP_OPTION (pfile, warn_trigraphs) = 2; 189 CPP_OPTION (pfile, warn_endif_labels) = 1; 190 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1; 191 CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0; 192 CPP_OPTION (pfile, cpp_warn_deprecated) = 1; 193 CPP_OPTION (pfile, cpp_warn_long_long) = 0; 194 CPP_OPTION (pfile, dollars_in_ident) = 1; 195 CPP_OPTION (pfile, warn_dollars) = 1; 196 CPP_OPTION (pfile, warn_variadic_macros) = 1; 197 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1; 198 CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0; 199 /* By default, track locations of tokens resulting from macro 200 expansion. The '2' means, track the locations with the highest 201 accuracy. Read the comments for struct 202 cpp_options::track_macro_expansion to learn about the other 203 values. */ 204 CPP_OPTION (pfile, track_macro_expansion) = 2; 205 CPP_OPTION (pfile, warn_normalize) = normalized_C; 206 CPP_OPTION (pfile, warn_literal_suffix) = 1; 207 CPP_OPTION (pfile, canonical_system_headers) 208 = ENABLE_CANONICAL_SYSTEM_HEADERS; 209 CPP_OPTION (pfile, ext_numeric_literals) = 1; 210 CPP_OPTION (pfile, warn_date_time) = 0; 211 212 /* Default CPP arithmetic to something sensible for the host for the 213 benefit of dumb users like fix-header. */ 214 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long); 215 CPP_OPTION (pfile, char_precision) = CHAR_BIT; 216 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int); 217 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int); 218 CPP_OPTION (pfile, unsigned_char) = 0; 219 CPP_OPTION (pfile, unsigned_wchar) = 1; 220 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */ 221 222 /* Default to no charset conversion. */ 223 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding (); 224 CPP_OPTION (pfile, wide_charset) = 0; 225 226 /* Default the input character set to UTF-8. */ 227 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding (); 228 229 /* A fake empty "directory" used as the starting point for files 230 looked up without a search path. Name cannot be '/' because we 231 don't want to prepend anything at all to filenames using it. All 232 other entries are correct zero-initialized. */ 233 pfile->no_search_path.name = (char *) ""; 234 235 /* Initialize the line map. */ 236 pfile->line_table = line_table; 237 238 /* Initialize lexer state. */ 239 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); 240 241 /* Set up static tokens. */ 242 pfile->avoid_paste.type = CPP_PADDING; 243 pfile->avoid_paste.val.source = NULL; 244 pfile->eof.type = CPP_EOF; 245 pfile->eof.flags = 0; 246 247 /* Create a token buffer for the lexer. */ 248 _cpp_init_tokenrun (&pfile->base_run, 250); 249 pfile->cur_run = &pfile->base_run; 250 pfile->cur_token = pfile->base_run.base; 251 252 /* Initialize the base context. */ 253 pfile->context = &pfile->base_context; 254 pfile->base_context.c.macro = 0; 255 pfile->base_context.prev = pfile->base_context.next = 0; 256 257 /* Aligned and unaligned storage. */ 258 pfile->a_buff = _cpp_get_buff (pfile, 0); 259 pfile->u_buff = _cpp_get_buff (pfile, 0); 260 261 /* Initialize table for push_macro/pop_macro. */ 262 pfile->pushed_macros = 0; 263 264 /* Do not force token locations by default. */ 265 pfile->forced_token_location_p = NULL; 266 267 /* Initialize source_date_epoch to -2 (not yet set). */ 268 pfile->source_date_epoch = (time_t) -2; 269 270 /* The expression parser stack. */ 271 _cpp_expand_op_stack (pfile); 272 273 /* Initialize the buffer obstack. */ 274 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free); 275 276 _cpp_init_files (pfile); 277 278 _cpp_init_hashtable (pfile, table); 279 280 return pfile; 281 } 282 283 /* Set the line_table entry in PFILE. This is called after reading a 284 PCH file, as the old line_table will be incorrect. */ 285 void 286 cpp_set_line_map (cpp_reader *pfile, struct line_maps *line_table) 287 { 288 pfile->line_table = line_table; 289 } 290 291 /* Free resources used by PFILE. Accessing PFILE after this function 292 returns leads to undefined behavior. Returns the error count. */ 293 void 294 cpp_destroy (cpp_reader *pfile) 295 { 296 cpp_context *context, *contextn; 297 struct def_pragma_macro *pmacro; 298 tokenrun *run, *runn; 299 int i; 300 301 free (pfile->op_stack); 302 303 while (CPP_BUFFER (pfile) != NULL) 304 _cpp_pop_buffer (pfile); 305 306 free (pfile->out.base); 307 308 if (pfile->macro_buffer) 309 { 310 free (pfile->macro_buffer); 311 pfile->macro_buffer = NULL; 312 pfile->macro_buffer_len = 0; 313 } 314 315 if (pfile->deps) 316 deps_free (pfile->deps); 317 obstack_free (&pfile->buffer_ob, 0); 318 319 _cpp_destroy_hashtable (pfile); 320 _cpp_cleanup_files (pfile); 321 _cpp_destroy_iconv (pfile); 322 323 _cpp_free_buff (pfile->a_buff); 324 _cpp_free_buff (pfile->u_buff); 325 _cpp_free_buff (pfile->free_buffs); 326 327 for (run = &pfile->base_run; run; run = runn) 328 { 329 runn = run->next; 330 free (run->base); 331 if (run != &pfile->base_run) 332 free (run); 333 } 334 335 for (context = pfile->base_context.next; context; context = contextn) 336 { 337 contextn = context->next; 338 free (context); 339 } 340 341 if (pfile->comments.entries) 342 { 343 for (i = 0; i < pfile->comments.count; i++) 344 free (pfile->comments.entries[i].comment); 345 346 free (pfile->comments.entries); 347 } 348 if (pfile->pushed_macros) 349 { 350 do 351 { 352 pmacro = pfile->pushed_macros; 353 pfile->pushed_macros = pmacro->next; 354 free (pmacro->name); 355 free (pmacro); 356 } 357 while (pfile->pushed_macros); 358 } 359 360 free (pfile); 361 } 362 363 /* This structure defines one built-in identifier. A node will be 364 entered in the hash table under the name NAME, with value VALUE. 365 366 There are two tables of these. builtin_array holds all the 367 "builtin" macros: these are handled by builtin_macro() in 368 macro.c. Builtin is somewhat of a misnomer -- the property of 369 interest is that these macros require special code to compute their 370 expansions. The value is a "cpp_builtin_type" enumerator. 371 372 operator_array holds the C++ named operators. These are keywords 373 which act as aliases for punctuators. In C++, they cannot be 374 altered through #define, and #if recognizes them as operators. In 375 C, these are not entered into the hash table at all (but see 376 <iso646.h>). The value is a token-type enumerator. */ 377 struct builtin_macro 378 { 379 const uchar *const name; 380 const unsigned short len; 381 const unsigned short value; 382 const bool always_warn_if_redefined; 383 }; 384 385 #define B(n, t, f) { DSC(n), t, f } 386 static const struct builtin_macro builtin_array[] = 387 { 388 B("__TIMESTAMP__", BT_TIMESTAMP, false), 389 B("__TIME__", BT_TIME, false), 390 B("__DATE__", BT_DATE, false), 391 B("__FILE__", BT_FILE, false), 392 B("__BASE_FILE__", BT_BASE_FILE, false), 393 B("__LINE__", BT_SPECLINE, true), 394 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true), 395 B("__COUNTER__", BT_COUNTER, true), 396 B("__has_attribute", BT_HAS_ATTRIBUTE, true), 397 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true), 398 /* Keep builtins not used for -traditional-cpp at the end, and 399 update init_builtins() if any more are added. */ 400 B("_Pragma", BT_PRAGMA, true), 401 B("__STDC__", BT_STDC, true), 402 }; 403 #undef B 404 405 struct builtin_operator 406 { 407 const uchar *const name; 408 const unsigned short len; 409 const unsigned short value; 410 }; 411 412 #define B(n, t) { DSC(n), t } 413 static const struct builtin_operator operator_array[] = 414 { 415 B("and", CPP_AND_AND), 416 B("and_eq", CPP_AND_EQ), 417 B("bitand", CPP_AND), 418 B("bitor", CPP_OR), 419 B("compl", CPP_COMPL), 420 B("not", CPP_NOT), 421 B("not_eq", CPP_NOT_EQ), 422 B("or", CPP_OR_OR), 423 B("or_eq", CPP_OR_EQ), 424 B("xor", CPP_XOR), 425 B("xor_eq", CPP_XOR_EQ) 426 }; 427 #undef B 428 429 /* Mark the C++ named operators in the hash table. */ 430 static void 431 mark_named_operators (cpp_reader *pfile, int flags) 432 { 433 const struct builtin_operator *b; 434 435 for (b = operator_array; 436 b < (operator_array + ARRAY_SIZE (operator_array)); 437 b++) 438 { 439 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 440 hp->flags |= flags; 441 hp->is_directive = 0; 442 hp->directive_index = b->value; 443 } 444 } 445 446 /* Helper function of cpp_type2name. Return the string associated with 447 named operator TYPE. */ 448 const char * 449 cpp_named_operator2name (enum cpp_ttype type) 450 { 451 const struct builtin_operator *b; 452 453 for (b = operator_array; 454 b < (operator_array + ARRAY_SIZE (operator_array)); 455 b++) 456 { 457 if (type == b->value) 458 return (const char *) b->name; 459 } 460 461 return NULL; 462 } 463 464 void 465 cpp_init_special_builtins (cpp_reader *pfile) 466 { 467 const struct builtin_macro *b; 468 size_t n = ARRAY_SIZE (builtin_array); 469 470 if (CPP_OPTION (pfile, traditional)) 471 n -= 2; 472 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers) 473 || CPP_OPTION (pfile, std)) 474 n--; 475 476 for (b = builtin_array; b < builtin_array + n; b++) 477 { 478 if (b->value == BT_HAS_ATTRIBUTE 479 && (CPP_OPTION (pfile, lang) == CLK_ASM 480 || pfile->cb.has_attribute == NULL)) 481 continue; 482 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); 483 hp->type = NT_MACRO; 484 hp->flags |= NODE_BUILTIN; 485 if (b->always_warn_if_redefined) 486 hp->flags |= NODE_WARN; 487 hp->value.builtin = (enum cpp_builtin_type) b->value; 488 } 489 } 490 491 /* Read the builtins table above and enter them, and language-specific 492 macros, into the hash table. HOSTED is true if this is a hosted 493 environment. */ 494 void 495 cpp_init_builtins (cpp_reader *pfile, int hosted) 496 { 497 cpp_init_special_builtins (pfile); 498 499 if (!CPP_OPTION (pfile, traditional) 500 && (! CPP_OPTION (pfile, stdc_0_in_system_headers) 501 || CPP_OPTION (pfile, std))) 502 _cpp_define_builtin (pfile, "__STDC__ 1"); 503 504 if (CPP_OPTION (pfile, cplusplus)) 505 { 506 if (CPP_OPTION (pfile, lang) == CLK_CXX2A 507 || CPP_OPTION (pfile, lang) == CLK_GNUCXX2A) 508 _cpp_define_builtin (pfile, "__cplusplus 201709L"); 509 else if (CPP_OPTION (pfile, lang) == CLK_CXX17 510 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17) 511 _cpp_define_builtin (pfile, "__cplusplus 201703L"); 512 else if (CPP_OPTION (pfile, lang) == CLK_CXX14 513 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14) 514 _cpp_define_builtin (pfile, "__cplusplus 201402L"); 515 else if (CPP_OPTION (pfile, lang) == CLK_CXX11 516 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11) 517 _cpp_define_builtin (pfile, "__cplusplus 201103L"); 518 else 519 _cpp_define_builtin (pfile, "__cplusplus 199711L"); 520 } 521 else if (CPP_OPTION (pfile, lang) == CLK_ASM) 522 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1"); 523 else if (CPP_OPTION (pfile, lang) == CLK_STDC94) 524 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L"); 525 else if (CPP_OPTION (pfile, lang) == CLK_STDC17 526 || CPP_OPTION (pfile, lang) == CLK_GNUC17) 527 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L"); 528 else if (CPP_OPTION (pfile, lang) == CLK_STDC11 529 || CPP_OPTION (pfile, lang) == CLK_GNUC11) 530 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L"); 531 else if (CPP_OPTION (pfile, c99)) 532 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L"); 533 534 if (CPP_OPTION (pfile, uliterals) 535 && !(CPP_OPTION (pfile, cplusplus) 536 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX 537 || CPP_OPTION (pfile, lang) == CLK_CXX98))) 538 { 539 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1"); 540 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1"); 541 } 542 543 if (hosted) 544 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1"); 545 else 546 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0"); 547 548 if (CPP_OPTION (pfile, objc)) 549 _cpp_define_builtin (pfile, "__OBJC__ 1"); 550 } 551 552 /* Sanity-checks are dependent on command-line options, so it is 553 called as a subroutine of cpp_read_main_file. */ 554 #if CHECKING_P 555 static void sanity_checks (cpp_reader *); 556 static void sanity_checks (cpp_reader *pfile) 557 { 558 cppchar_t test = 0; 559 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part); 560 561 /* Sanity checks for assumptions about CPP arithmetic and target 562 type precisions made by cpplib. */ 563 test--; 564 if (test < 1) 565 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type"); 566 567 if (CPP_OPTION (pfile, precision) > max_precision) 568 cpp_error (pfile, CPP_DL_ICE, 569 "preprocessor arithmetic has maximum precision of %lu bits;" 570 " target requires %lu bits", 571 (unsigned long) max_precision, 572 (unsigned long) CPP_OPTION (pfile, precision)); 573 574 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision)) 575 cpp_error (pfile, CPP_DL_ICE, 576 "CPP arithmetic must be at least as precise as a target int"); 577 578 if (CPP_OPTION (pfile, char_precision) < 8) 579 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide"); 580 581 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision)) 582 cpp_error (pfile, CPP_DL_ICE, 583 "target wchar_t is narrower than target char"); 584 585 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision)) 586 cpp_error (pfile, CPP_DL_ICE, 587 "target int is narrower than target char"); 588 589 /* This is assumed in eval_token() and could be fixed if necessary. */ 590 if (sizeof (cppchar_t) > sizeof (cpp_num_part)) 591 cpp_error (pfile, CPP_DL_ICE, 592 "CPP half-integer narrower than CPP character"); 593 594 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T) 595 cpp_error (pfile, CPP_DL_ICE, 596 "CPP on this host cannot handle wide character constants over" 597 " %lu bits, but the target requires %lu bits", 598 (unsigned long) BITS_PER_CPPCHAR_T, 599 (unsigned long) CPP_OPTION (pfile, wchar_precision)); 600 } 601 #else 602 # define sanity_checks(PFILE) 603 #endif 604 605 /* This is called after options have been parsed, and partially 606 processed. */ 607 void 608 cpp_post_options (cpp_reader *pfile) 609 { 610 int flags; 611 612 sanity_checks (pfile); 613 614 post_options (pfile); 615 616 /* Mark named operators before handling command line macros. */ 617 flags = 0; 618 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names)) 619 flags |= NODE_OPERATOR; 620 if (CPP_OPTION (pfile, warn_cxx_operator_names)) 621 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR; 622 if (flags != 0) 623 mark_named_operators (pfile, flags); 624 } 625 626 /* Setup for processing input from the file named FNAME, or stdin if 627 it is the empty string. Return the original filename 628 on success (e.g. foo.i->foo.c), or NULL on failure. */ 629 const char * 630 cpp_read_main_file (cpp_reader *pfile, const char *fname) 631 { 632 const source_location loc = 0; 633 634 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE) 635 { 636 if (!pfile->deps) 637 pfile->deps = deps_init (); 638 639 /* Set the default target (if there is none already). */ 640 deps_add_default_target (pfile->deps, fname); 641 } 642 643 pfile->main_file 644 = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0, false, 645 loc); 646 if (_cpp_find_failed (pfile->main_file)) 647 return NULL; 648 649 _cpp_stack_file (pfile, pfile->main_file, false, loc); 650 651 /* For foo.i, read the original filename foo.c now, for the benefit 652 of the front ends. */ 653 if (CPP_OPTION (pfile, preprocessed)) 654 { 655 read_original_filename (pfile); 656 fname = 657 ORDINARY_MAP_FILE_NAME 658 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table))); 659 } 660 return fname; 661 } 662 663 /* For preprocessed files, if the first tokens are of the form # NUM. 664 handle the directive so we know the original file name. This will 665 generate file_change callbacks, which the front ends must handle 666 appropriately given their state of initialization. */ 667 static void 668 read_original_filename (cpp_reader *pfile) 669 { 670 const cpp_token *token, *token1; 671 672 /* Lex ahead; if the first tokens are of the form # NUM, then 673 process the directive, otherwise back up. */ 674 token = _cpp_lex_direct (pfile); 675 if (token->type == CPP_HASH) 676 { 677 pfile->state.in_directive = 1; 678 token1 = _cpp_lex_direct (pfile); 679 _cpp_backup_tokens (pfile, 1); 680 pfile->state.in_directive = 0; 681 682 /* If it's a #line directive, handle it. */ 683 if (token1->type == CPP_NUMBER 684 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE)) 685 { 686 read_original_directory (pfile); 687 return; 688 } 689 } 690 691 /* Backup as if nothing happened. */ 692 _cpp_backup_tokens (pfile, 1); 693 } 694 695 /* For preprocessed files, if the tokens following the first filename 696 line is of the form # <line> "/path/name//", handle the 697 directive so we know the original current directory. */ 698 static void 699 read_original_directory (cpp_reader *pfile) 700 { 701 const cpp_token *hash, *token; 702 703 /* Lex ahead; if the first tokens are of the form # NUM, then 704 process the directive, otherwise back up. */ 705 hash = _cpp_lex_direct (pfile); 706 if (hash->type != CPP_HASH) 707 { 708 _cpp_backup_tokens (pfile, 1); 709 return; 710 } 711 712 token = _cpp_lex_direct (pfile); 713 714 if (token->type != CPP_NUMBER) 715 { 716 _cpp_backup_tokens (pfile, 2); 717 return; 718 } 719 720 token = _cpp_lex_direct (pfile); 721 722 if (token->type != CPP_STRING 723 || ! (token->val.str.len >= 5 724 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2]) 725 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3]))) 726 { 727 _cpp_backup_tokens (pfile, 3); 728 return; 729 } 730 731 if (pfile->cb.dir_change) 732 { 733 char *debugdir = (char *) alloca (token->val.str.len - 3); 734 735 memcpy (debugdir, (const char *) token->val.str.text + 1, 736 token->val.str.len - 4); 737 debugdir[token->val.str.len - 4] = '\0'; 738 739 pfile->cb.dir_change (pfile, debugdir); 740 } 741 } 742 743 /* This is called at the end of preprocessing. It pops the last 744 buffer and writes dependency output. 745 746 Maybe it should also reset state, such that you could call 747 cpp_start_read with a new filename to restart processing. */ 748 void 749 cpp_finish (cpp_reader *pfile, FILE *deps_stream) 750 { 751 /* Warn about unused macros before popping the final buffer. */ 752 if (CPP_OPTION (pfile, warn_unused_macros)) 753 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL); 754 755 /* lex.c leaves the final buffer on the stack. This it so that 756 it returns an unending stream of CPP_EOFs to the client. If we 757 popped the buffer, we'd dereference a NULL buffer pointer and 758 segfault. It's nice to allow the client to do worry-free excess 759 cpp_get_token calls. */ 760 while (pfile->buffer) 761 _cpp_pop_buffer (pfile); 762 763 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE 764 && deps_stream) 765 { 766 deps_write (pfile->deps, deps_stream, 72); 767 768 if (CPP_OPTION (pfile, deps.phony_targets)) 769 deps_phony_targets (pfile->deps, deps_stream); 770 } 771 772 /* Report on headers that could use multiple include guards. */ 773 if (CPP_OPTION (pfile, print_include_names)) 774 _cpp_report_missing_guards (pfile); 775 } 776 777 static void 778 post_options (cpp_reader *pfile) 779 { 780 /* -Wtraditional is not useful in C++ mode. */ 781 if (CPP_OPTION (pfile, cplusplus)) 782 CPP_OPTION (pfile, cpp_warn_traditional) = 0; 783 784 /* Permanently disable macro expansion if we are rescanning 785 preprocessed text. Read preprocesed source in ISO mode. */ 786 if (CPP_OPTION (pfile, preprocessed)) 787 { 788 if (!CPP_OPTION (pfile, directives_only)) 789 pfile->state.prevent_expansion = 1; 790 CPP_OPTION (pfile, traditional) = 0; 791 } 792 793 if (CPP_OPTION (pfile, warn_trigraphs) == 2) 794 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs); 795 796 if (CPP_OPTION (pfile, traditional)) 797 { 798 CPP_OPTION (pfile, trigraphs) = 0; 799 CPP_OPTION (pfile, warn_trigraphs) = 0; 800 } 801 } 802