1/* Part of CPP library. (Precompiled header reading/writing.) 2 Copyright (C) 2000-2020 Free Software Foundation, Inc. 3 4This program is free software; you can redistribute it and/or modify it 5under the terms of the GNU General Public License as published by the 6Free Software Foundation; either version 3, or (at your option) any 7later version. 8 9This program is distributed in the hope that it will be useful, 10but WITHOUT ANY WARRANTY; without even the implied warranty of 11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12GNU General Public License for more details. 13 14You should have received a copy of the GNU General Public License 15along with this program; see the file COPYING3. If not see 16<http://www.gnu.org/licenses/>. */ 17 18#include "config.h" 19#include "system.h" 20#include "cpplib.h" 21#include "internal.h" 22#include "hashtab.h" 23#include "mkdeps.h" 24 25static int write_macdef (cpp_reader *, cpp_hashnode *, void *); 26static int save_idents (cpp_reader *, cpp_hashnode *, void *); 27static hashval_t hashmem (const void *, size_t); 28static hashval_t cpp_string_hash (const void *); 29static int cpp_string_eq (const void *, const void *); 30static int count_defs (cpp_reader *, cpp_hashnode *, void *); 31static int comp_hashnodes (const void *, const void *); 32static int collect_ht_nodes (cpp_reader *, cpp_hashnode *, void *); 33static int write_defs (cpp_reader *, cpp_hashnode *, void *); 34static int save_macros (cpp_reader *, cpp_hashnode *, void *); 35static int _cpp_save_pushed_macros (cpp_reader *, FILE *); 36static int _cpp_restore_pushed_macros (cpp_reader *, FILE *); 37 38/* This structure represents a macro definition on disk. */ 39struct macrodef_struct 40{ 41 unsigned int definition_length; 42 unsigned short name_length; 43 unsigned short flags; 44}; 45 46/* This is how we write out a macro definition. 47 Suitable for being called by cpp_forall_identifiers. */ 48 49static int 50write_macdef (cpp_reader *pfile, cpp_hashnode *hn, void *file_p) 51{ 52 FILE *f = (FILE *) file_p; 53 bool is_void = false; 54 switch (hn->type) 55 { 56 case NT_VOID: 57 if (! (hn->flags & NODE_POISONED)) 58 return 1; 59 is_void = true; 60 goto poisoned; 61 62 case NT_BUILTIN_MACRO: 63 return 1; 64 65 case NT_USER_MACRO: 66 if (hn->value.macro->kind != cmk_assert) 67 { 68 poisoned: 69 struct macrodef_struct s; 70 const unsigned char *defn; 71 72 s.name_length = NODE_LEN (hn); 73 s.flags = hn->flags & NODE_POISONED; 74 75 if (is_void) 76 { 77 defn = NODE_NAME (hn); 78 s.definition_length = s.name_length; 79 } 80 else 81 { 82 defn = cpp_macro_definition (pfile, hn); 83 s.definition_length = ustrlen (defn); 84 } 85 86 if (fwrite (&s, sizeof (s), 1, f) != 1 87 || fwrite (defn, 1, s.definition_length, f) != s.definition_length) 88 { 89 cpp_errno (pfile, CPP_DL_ERROR, 90 "while writing precompiled header"); 91 return 0; 92 } 93 } 94 return 1; 95 96 default: 97 abort (); 98 } 99} 100 101/* This structure records the names of the defined macros. 102 It's also used as a callback structure for size_initial_idents 103 and save_idents. */ 104 105struct cpp_savedstate 106{ 107 /* A hash table of the defined identifiers. */ 108 htab_t definedhash; 109 /* The size of the definitions of those identifiers (the size of 110 'definedstrs'). */ 111 size_t hashsize; 112 /* Number of definitions */ 113 size_t n_defs; 114 /* Array of definitions. In cpp_write_pch_deps it is used for sorting. */ 115 cpp_hashnode **defs; 116 /* Space for the next definition. Definitions are null-terminated 117 strings. */ 118 unsigned char *definedstrs; 119}; 120 121/* Save this identifier into the state: put it in the hash table, 122 put the definition in 'definedstrs'. */ 123 124static int 125save_idents (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn, void *ss_p) 126{ 127 struct cpp_savedstate *const ss = (struct cpp_savedstate *)ss_p; 128 129 if (hn->type != NT_VOID) 130 { 131 struct cpp_string news; 132 void **slot; 133 134 news.len = NODE_LEN (hn); 135 news.text= NODE_NAME (hn); 136 slot = htab_find_slot (ss->definedhash, &news, INSERT); 137 if (*slot == NULL) 138 { 139 struct cpp_string *sp; 140 unsigned char *text; 141 142 sp = XNEW (struct cpp_string); 143 *slot = sp; 144 145 sp->len = NODE_LEN (hn); 146 sp->text = text = XNEWVEC (unsigned char, NODE_LEN (hn)); 147 memcpy (text, NODE_NAME (hn), NODE_LEN (hn)); 148 } 149 } 150 151 return 1; 152} 153 154/* Hash some memory in a generic way. */ 155 156static hashval_t 157hashmem (const void *p_p, size_t sz) 158{ 159 const unsigned char *p = (const unsigned char *)p_p; 160 size_t i; 161 hashval_t h; 162 163 h = 0; 164 for (i = 0; i < sz; i++) 165 h = h * 67 - (*p++ - 113); 166 return h; 167} 168 169/* Hash a cpp string for the hashtable machinery. */ 170 171static hashval_t 172cpp_string_hash (const void *a_p) 173{ 174 const struct cpp_string *a = (const struct cpp_string *) a_p; 175 return hashmem (a->text, a->len); 176} 177 178/* Compare two cpp strings for the hashtable machinery. */ 179 180static int 181cpp_string_eq (const void *a_p, const void *b_p) 182{ 183 const struct cpp_string *a = (const struct cpp_string *) a_p; 184 const struct cpp_string *b = (const struct cpp_string *) b_p; 185 return (a->len == b->len 186 && memcmp (a->text, b->text, a->len) == 0); 187} 188 189/* Free memory associated with cpp_string. */ 190 191static void 192cpp_string_free (void *a_p) 193{ 194 struct cpp_string *a = (struct cpp_string *) a_p; 195 free ((void *) a->text); 196 free (a); 197} 198 199/* Save the current definitions of the cpp_reader for dependency 200 checking purposes. When writing a precompiled header, this should 201 be called at the same point in the compilation as cpp_valid_state 202 would be called when reading the precompiled header back in. */ 203 204int 205cpp_save_state (cpp_reader *r, FILE *f) 206{ 207 /* Save the list of non-void identifiers for the dependency checking. */ 208 r->savedstate = XNEW (struct cpp_savedstate); 209 r->savedstate->definedhash = htab_create (100, cpp_string_hash, 210 cpp_string_eq, cpp_string_free); 211 cpp_forall_identifiers (r, save_idents, r->savedstate); 212 213 /* Write out the list of defined identifiers. */ 214 cpp_forall_identifiers (r, write_macdef, f); 215 216 return 0; 217} 218 219/* Calculate the 'hashsize' field of the saved state. */ 220 221static int 222count_defs (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn, void *ss_p) 223{ 224 struct cpp_savedstate *const ss = (struct cpp_savedstate *)ss_p; 225 226 switch (hn->type) 227 { 228 case NT_BUILTIN_MACRO: 229 return 1; 230 231 case NT_USER_MACRO: 232 if (hn->value.macro->kind == cmk_assert) 233 return 1; 234 235 /* fall through. */ 236 237 case NT_VOID: 238 { 239 struct cpp_string news; 240 void **slot; 241 242 news.len = NODE_LEN (hn); 243 news.text = NODE_NAME (hn); 244 slot = (void **) htab_find (ss->definedhash, &news); 245 if (slot == NULL) 246 { 247 ss->hashsize += NODE_LEN (hn) + 1; 248 ss->n_defs += 1; 249 } 250 } 251 return 1; 252 253 default: 254 abort (); 255 } 256} 257 258/* Collect the identifiers into the state's string table. */ 259static int 260write_defs (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn, void *ss_p) 261{ 262 struct cpp_savedstate *const ss = (struct cpp_savedstate *)ss_p; 263 264 switch (hn->type) 265 { 266 case NT_BUILTIN_MACRO: 267 return 1; 268 269 case NT_USER_MACRO: 270 if (hn->value.macro->kind == cmk_assert) 271 return 1; 272 273 /* fall through. */ 274 275 case NT_VOID: 276 { 277 struct cpp_string news; 278 void **slot; 279 280 news.len = NODE_LEN (hn); 281 news.text = NODE_NAME (hn); 282 slot = (void **) htab_find (ss->definedhash, &news); 283 if (slot == NULL) 284 { 285 ss->defs[ss->n_defs] = hn; 286 ss->n_defs += 1; 287 } 288 } 289 return 1; 290 291 default: 292 abort (); 293 } 294} 295 296/* Comparison function for qsort. The arguments point to pointers of 297 type ht_hashnode *. */ 298static int 299comp_hashnodes (const void *px, const void *py) 300{ 301 cpp_hashnode *x = *(cpp_hashnode **) px; 302 cpp_hashnode *y = *(cpp_hashnode **) py; 303 return ustrcmp (NODE_NAME (x), NODE_NAME (y)); 304} 305 306/* Write out the remainder of the dependency information. This should be 307 called after the PCH is ready to be saved. */ 308 309int 310cpp_write_pch_deps (cpp_reader *r, FILE *f) 311{ 312 struct macrodef_struct z; 313 struct cpp_savedstate *const ss = r->savedstate; 314 unsigned char *definedstrs; 315 size_t i; 316 317 /* Collect the list of identifiers which have been seen and 318 weren't defined to anything previously. */ 319 ss->hashsize = 0; 320 ss->n_defs = 0; 321 cpp_forall_identifiers (r, count_defs, ss); 322 323 ss->defs = XNEWVEC (cpp_hashnode *, ss->n_defs); 324 ss->n_defs = 0; 325 cpp_forall_identifiers (r, write_defs, ss); 326 327 /* Sort the list, copy it into a buffer, and write it out. */ 328 qsort (ss->defs, ss->n_defs, sizeof (cpp_hashnode *), &comp_hashnodes); 329 definedstrs = ss->definedstrs = XNEWVEC (unsigned char, ss->hashsize); 330 for (i = 0; i < ss->n_defs; ++i) 331 { 332 size_t len = NODE_LEN (ss->defs[i]); 333 memcpy (definedstrs, NODE_NAME (ss->defs[i]), len + 1); 334 definedstrs += len + 1; 335 } 336 337 memset (&z, 0, sizeof (z)); 338 z.definition_length = ss->hashsize; 339 if (fwrite (&z, sizeof (z), 1, f) != 1 340 || fwrite (ss->definedstrs, ss->hashsize, 1, f) != 1) 341 { 342 cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header"); 343 return -1; 344 } 345 free (ss->definedstrs); 346 free (ss->defs); 347 htab_delete (ss->definedhash); 348 349 /* Free the saved state. */ 350 free (ss); 351 r->savedstate = NULL; 352 353 /* Save the next value of __COUNTER__. */ 354 if (fwrite (&r->counter, sizeof (r->counter), 1, f) != 1) 355 { 356 cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header"); 357 return -1; 358 } 359 360 return 0; 361} 362 363/* Write out the definitions of the preprocessor, in a form suitable for 364 cpp_read_state. */ 365 366int 367cpp_write_pch_state (cpp_reader *r, FILE *f) 368{ 369 if (!r->deps) 370 r->deps = deps_init (); 371 372 if (deps_save (r->deps, f) != 0) 373 { 374 cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header"); 375 return -1; 376 } 377 378 if (! _cpp_save_file_entries (r, f)) 379 { 380 cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header"); 381 return -1; 382 } 383 384 /* Save the next __COUNTER__ value. When we include a precompiled header, 385 we need to start at the offset we would have if the header had been 386 included normally. */ 387 if (fwrite (&r->counter, sizeof (r->counter), 1, f) != 1) 388 { 389 cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header"); 390 return -1; 391 } 392 393 /* Write saved macros. */ 394 if (! _cpp_save_pushed_macros (r, f)) 395 { 396 cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header"); 397 return -1; 398 } 399 400 return 0; 401} 402 403static int 404_cpp_restore_pushed_macros (cpp_reader *r, FILE *f) 405{ 406 size_t count_saved = 0; 407 size_t i; 408 struct def_pragma_macro *p; 409 size_t nlen; 410 uchar *defn; 411 size_t defnlen; 412 413 if (fread (&count_saved, sizeof (count_saved), 1, f) != 1) 414 return 0; 415 if (! count_saved) 416 return 1; 417 for (i = 0; i < count_saved; i++) 418 { 419 if (fread (&nlen, sizeof (nlen), 1, f) != 1) 420 return 0; 421 p = XNEW (struct def_pragma_macro); 422 memset (p, 0, sizeof (struct def_pragma_macro)); 423 p->name = XNEWVAR (char, nlen + 1); 424 p->name[nlen] = 0; 425 if (fread (p->name, nlen, 1, f) != 1) 426 return 0; 427 if (fread (&defnlen, sizeof (defnlen), 1, f) != 1) 428 return 0; 429 if (defnlen == 0) 430 p->is_undef = 1; 431 else 432 { 433 defn = XNEWVEC (uchar, defnlen + 1); 434 defn[defnlen] = 0; 435 436 if (fread (defn, defnlen, 1, f) != 1) 437 return 0; 438 439 p->definition = defn; 440 if (fread (&(p->line), sizeof (location_t), 1, f) != 1) 441 return 0; 442 defnlen = 0; 443 if (fread (&defnlen, sizeof (defnlen), 1, f) != 1) 444 return 0; 445 p->syshdr = ((defnlen & 1) != 0 ? 1 : 0); 446 p->used = ((defnlen & 2) != 0 ? 1 : 0); 447 } 448 449 p->next = r->pushed_macros; 450 r->pushed_macros = p; 451 } 452 return 1; 453} 454 455static int 456_cpp_save_pushed_macros (cpp_reader *r, FILE *f) 457{ 458 size_t count_saved = 0; 459 size_t i; 460 struct def_pragma_macro *p,**pp; 461 size_t defnlen; 462 463 /* Get count. */ 464 p = r->pushed_macros; 465 while (p != NULL) 466 { 467 count_saved++; 468 p = p->next; 469 } 470 if (fwrite (&count_saved, sizeof (count_saved), 1, f) != 1) 471 return 0; 472 if (!count_saved) 473 return 1; 474 475 pp = (struct def_pragma_macro **) alloca (sizeof (struct def_pragma_macro *) 476 * count_saved); 477 /* Store them in reverse order. */ 478 p = r->pushed_macros; 479 i = count_saved; 480 while (p != NULL) 481 { 482 --i; 483 pp[i] = p; 484 p = p->next; 485 } 486 for (i = 0; i < count_saved; i++) 487 { 488 defnlen = strlen (pp[i]->name); 489 if (fwrite (&defnlen, sizeof (size_t), 1, f) != 1 490 || fwrite (pp[i]->name, defnlen, 1, f) != 1) 491 return 0; 492 if (pp[i]->is_undef) 493 { 494 defnlen = 0; 495 if (fwrite (&defnlen, sizeof (size_t), 1, f) != 1) 496 return 0; 497 } 498 else 499 { 500 defnlen = ustrlen (pp[i]->definition); 501 if (fwrite (&defnlen, sizeof (size_t), 1, f) != 1 502 || fwrite (pp[i]->definition, defnlen, 1, f) != 1) 503 return 0; 504 if (fwrite (&(pp[i]->line), sizeof (location_t), 1, f) != 1) 505 return 0; 506 defnlen = 0; 507 defnlen |= (pp[i]->syshdr != 0 ? 1 : 0); 508 defnlen |= (pp[i]->used != 0 ? 2 : 0); 509 if (fwrite (&defnlen, sizeof (defnlen), 1, f) != 1) 510 return 0; 511 } 512 } 513 return 1; 514} 515 516 517/* Data structure to transform hash table nodes into a sorted list */ 518 519struct ht_node_list 520{ 521 /* Array of nodes */ 522 cpp_hashnode **defs; 523 /* Number of nodes in the array */ 524 size_t n_defs; 525 /* Size of the allocated array */ 526 size_t asize; 527}; 528 529/* Callback for collecting identifiers from hash table */ 530 531static int 532collect_ht_nodes (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn, 533 void *nl_p) 534{ 535 struct ht_node_list *const nl = (struct ht_node_list *)nl_p; 536 537 if (hn->type != NT_VOID || hn->flags & NODE_POISONED) 538 { 539 if (nl->n_defs == nl->asize) 540 { 541 nl->asize *= 2; 542 nl->defs = XRESIZEVEC (cpp_hashnode *, nl->defs, nl->asize); 543 } 544 545 nl->defs[nl->n_defs] = hn; 546 ++nl->n_defs; 547 } 548 return 1; 549} 550 551 552/* Return nonzero if FD is a precompiled header which is consistent 553 with the preprocessor's current definitions. It will be consistent 554 when: 555 556 - anything that was defined just before the PCH was generated 557 is defined the same way now; and 558 - anything that was not defined then, but is defined now, was not 559 used by the PCH. 560 561 NAME is used to print warnings if `warn_invalid_pch' is set in the 562 reader's flags. 563*/ 564 565int 566cpp_valid_state (cpp_reader *r, const char *name, int fd) 567{ 568 struct macrodef_struct m; 569 size_t namebufsz = 256; 570 unsigned char *namebuf = XNEWVEC (unsigned char, namebufsz); 571 unsigned char *undeftab = NULL; 572 struct ht_node_list nl = { 0, 0, 0 }; 573 unsigned char *first, *last; 574 unsigned int i; 575 unsigned int counter; 576 577 /* Read in the list of identifiers that must be defined 578 Check that they are defined in the same way. */ 579 for (;;) 580 { 581 cpp_hashnode *h; 582 const unsigned char *newdefn; 583 584 if (read (fd, &m, sizeof (m)) != sizeof (m)) 585 goto error; 586 587 if (m.name_length == 0) 588 break; 589 590 /* If this file is already preprocessed, there won't be any 591 macros defined, and that's OK. */ 592 if (CPP_OPTION (r, preprocessed)) 593 { 594 if (lseek (fd, m.definition_length, SEEK_CUR) == -1) 595 goto error; 596 continue; 597 } 598 599 if (m.definition_length > namebufsz) 600 { 601 free (namebuf); 602 namebufsz = m.definition_length + 256; 603 namebuf = XNEWVEC (unsigned char, namebufsz); 604 } 605 606 if ((size_t)read (fd, namebuf, m.definition_length) 607 != m.definition_length) 608 goto error; 609 610 h = cpp_lookup (r, namebuf, m.name_length); 611 if (m.flags & NODE_POISONED 612 || h->flags & NODE_POISONED) 613 { 614 if (CPP_OPTION (r, warn_invalid_pch)) 615 cpp_warning_syshdr (r, CPP_W_INVALID_PCH, 616 "%s: not used because `%.*s' is poisoned", 617 name, m.name_length, namebuf); 618 goto fail; 619 } 620 621 if (h->type == NT_VOID) 622 { 623 /* It's ok if __GCC_HAVE_DWARF2_CFI_ASM becomes undefined, 624 as in, when the PCH file is created with -g and we're 625 attempting to use it without -g. Restoring the PCH file 626 is supposed to bring in this definition *and* enable the 627 generation of call frame information, so that precompiled 628 definitions that take this macro into account, to decide 629 what asm to emit, won't issue .cfi directives when the 630 compiler doesn't. */ 631 if (!(h->flags & NODE_USED) 632 && m.name_length == sizeof ("__GCC_HAVE_DWARF2_CFI_ASM") - 1 633 && !memcmp (namebuf, "__GCC_HAVE_DWARF2_CFI_ASM", m.name_length)) 634 continue; 635 636 if (CPP_OPTION (r, warn_invalid_pch)) 637 cpp_warning_syshdr (r, CPP_W_INVALID_PCH, 638 "%s: not used because `%.*s' not defined", 639 name, m.name_length, namebuf); 640 goto fail; 641 } 642 643 newdefn = cpp_macro_definition (r, h); 644 645 if (m.definition_length != ustrlen (newdefn) 646 || memcmp (namebuf, newdefn, m.definition_length) != 0) 647 { 648 if (CPP_OPTION (r, warn_invalid_pch)) 649 cpp_warning_syshdr (r, CPP_W_INVALID_PCH, 650 "%s: not used because `%.*s' defined as `%s' not `%.*s'", 651 name, m.name_length, namebuf, newdefn + m.name_length, 652 m.definition_length - m.name_length, 653 namebuf + m.name_length); 654 goto fail; 655 } 656 } 657 free (namebuf); 658 namebuf = NULL; 659 660 /* Read in the list of identifiers that must not be defined. 661 Check that they really aren't. */ 662 undeftab = XNEWVEC (unsigned char, m.definition_length); 663 if ((size_t) read (fd, undeftab, m.definition_length) != m.definition_length) 664 goto error; 665 666 /* Collect identifiers from the current hash table. */ 667 nl.n_defs = 0; 668 nl.asize = 10; 669 nl.defs = XNEWVEC (cpp_hashnode *, nl.asize); 670 cpp_forall_identifiers (r, &collect_ht_nodes, &nl); 671 qsort (nl.defs, nl.n_defs, sizeof (cpp_hashnode *), &comp_hashnodes); 672 673 /* Loop through nl.defs and undeftab, both of which are sorted lists. 674 There should be no matches. */ 675 first = undeftab; 676 last = undeftab + m.definition_length; 677 i = 0; 678 679 while (first < last && i < nl.n_defs) 680 { 681 int cmp = ustrcmp (first, NODE_NAME (nl.defs[i])); 682 683 if (cmp < 0) 684 first += ustrlen (first) + 1; 685 else if (cmp > 0) 686 ++i; 687 else 688 { 689 if (CPP_OPTION (r, warn_invalid_pch)) 690 cpp_warning_syshdr (r, CPP_W_INVALID_PCH, 691 "%s: not used because `%s' is defined", 692 name, first); 693 goto fail; 694 } 695 } 696 697 free(nl.defs); 698 nl.defs = NULL; 699 free (undeftab); 700 undeftab = NULL; 701 702 /* Read in the next value of __COUNTER__. 703 Check that (a) __COUNTER__ was not used in the pch or (b) __COUNTER__ 704 has not been used in this translation unit. */ 705 if (read (fd, &counter, sizeof (counter)) != sizeof (counter)) 706 goto error; 707 if (counter && r->counter) 708 { 709 if (CPP_OPTION (r, warn_invalid_pch)) 710 cpp_warning_syshdr (r, CPP_W_INVALID_PCH, 711 "%s: not used because `__COUNTER__' is invalid", 712 name); 713 goto fail; 714 } 715 716 /* We win! */ 717 return 0; 718 719 error: 720 cpp_errno (r, CPP_DL_ERROR, "while reading precompiled header"); 721 722 fail: 723 free (namebuf); 724 free (undeftab); 725 free (nl.defs); 726 return 1; 727} 728 729/* Save all the existing macros. */ 730 731struct save_macro_data 732{ 733 uchar **defns; 734 size_t count; 735 size_t array_size; 736 char **saved_pragmas; 737}; 738 739/* Save the definition of a single macro, so that it will persist 740 across a PCH restore. Because macro data is in GCed memory, which 741 will be blown away by PCH, it must be temporarily copied to 742 malloced memory. (The macros will refer to identifier nodes which 743 are also GCed and so on, so the copying is done by turning them 744 into self-contained strings.) The assumption is that most macro 745 definitions will come from the PCH file, not from the compilation 746 before the PCH file is loaded, so it doesn't matter that this is 747 a little expensive. 748 749 It would reduce the cost even further if macros defined in the PCH 750 file were not saved in this way, but this is not done (yet), except 751 for builtins, and for #assert by default. */ 752 753static int 754save_macros (cpp_reader *r, cpp_hashnode *h, void *data_p) 755{ 756 struct save_macro_data *data = (struct save_macro_data *)data_p; 757 758 if (cpp_user_macro_p (h)) 759 { 760 if (data->count == data->array_size) 761 { 762 data->array_size *= 2; 763 data->defns = XRESIZEVEC (uchar *, data->defns, (data->array_size)); 764 } 765 766 const uchar * defn = cpp_macro_definition (r, h); 767 size_t defnlen = ustrlen (defn); 768 769 data->defns[data->count] = (uchar *) xmemdup (defn, defnlen, defnlen + 2); 770 data->defns[data->count][defnlen] = '\n'; 771 data->count++; 772 } 773 774 return 1; 775} 776 777/* Prepare to restore the state, by saving the currently-defined 778 macros in 'data'. */ 779 780void 781cpp_prepare_state (cpp_reader *r, struct save_macro_data **data) 782{ 783 struct save_macro_data *d = XNEW (struct save_macro_data); 784 785 d->array_size = 512; 786 d->defns = XNEWVEC (uchar *, d->array_size); 787 d->count = 0; 788 cpp_forall_identifiers (r, save_macros, d); 789 d->saved_pragmas = _cpp_save_pragma_names (r); 790 *data = d; 791} 792 793/* Given a precompiled header that was previously determined to be valid, 794 apply all its definitions (and undefinitions) to the current state. 795 DEPNAME is passed to deps_restore. */ 796 797int 798cpp_read_state (cpp_reader *r, const char *name, FILE *f, 799 struct save_macro_data *data) 800{ 801 size_t i; 802 struct lexer_state old_state; 803 unsigned int counter; 804 805 /* Restore spec_nodes, which will be full of references to the old 806 hashtable entries and so will now be invalid. */ 807 { 808 struct spec_nodes *s = &r->spec_nodes; 809 s->n_defined = cpp_lookup (r, DSC("defined")); 810 s->n_true = cpp_lookup (r, DSC("true")); 811 s->n_false = cpp_lookup (r, DSC("false")); 812 s->n__VA_ARGS__ = cpp_lookup (r, DSC("__VA_ARGS__")); 813 s->n__VA_OPT__ = cpp_lookup (r, DSC("__VA_OPT__")); 814 } 815 816 old_state = r->state; 817 r->state.in_directive = 1; 818 r->state.prevent_expansion = 1; 819 r->state.angled_headers = 0; 820 821 /* Run through the carefully-saved macros, insert them. */ 822 for (i = 0; i < data->count; i++) 823 { 824 cpp_hashnode *h; 825 size_t namelen; 826 uchar *defn; 827 828 namelen = ustrcspn (data->defns[i], "( \n"); 829 h = cpp_lookup (r, data->defns[i], namelen); 830 defn = data->defns[i] + namelen; 831 832 /* The PCH file is valid, so we know that if there is a definition 833 from the PCH file it must be the same as the one we had 834 originally, and so do not need to restore it. */ 835 if (h->type == NT_VOID) 836 { 837 if (cpp_push_buffer (r, defn, ustrchr (defn, '\n') - defn, true) 838 != NULL) 839 { 840 _cpp_clean_line (r); 841 if (!_cpp_create_definition (r, h)) 842 abort (); 843 _cpp_pop_buffer (r); 844 } 845 else 846 abort (); 847 } 848 849 free (data->defns[i]); 850 } 851 r->state = old_state; 852 853 _cpp_restore_pragma_names (r, data->saved_pragmas); 854 855 free (data); 856 857 if (deps_restore (r->deps, f, CPP_OPTION (r, restore_pch_deps) ? name : NULL) 858 != 0) 859 goto error; 860 861 if (! _cpp_read_file_entries (r, f)) 862 goto error; 863 864 if (fread (&counter, sizeof (counter), 1, f) != 1) 865 goto error; 866 867 if (!r->counter) 868 r->counter = counter; 869 870 /* Read pushed macros. */ 871 if (! _cpp_restore_pushed_macros (r, f)) 872 goto error; 873 return 0; 874 875 error: 876 cpp_errno (r, CPP_DL_ERROR, "while reading precompiled header"); 877 return -1; 878} 879