903 lines
23 KiB
C
903 lines
23 KiB
C
/* Part of CPP library. (Precompiled header reading/writing.)
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Copyright (C) 2000-2016 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "cpplib.h"
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#include "internal.h"
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#include "hashtab.h"
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#include "mkdeps.h"
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static int write_macdef (cpp_reader *, cpp_hashnode *, void *);
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static int save_idents (cpp_reader *, cpp_hashnode *, void *);
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static hashval_t hashmem (const void *, size_t);
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static hashval_t cpp_string_hash (const void *);
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static int cpp_string_eq (const void *, const void *);
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static int count_defs (cpp_reader *, cpp_hashnode *, void *);
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static int comp_hashnodes (const void *, const void *);
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static int collect_ht_nodes (cpp_reader *, cpp_hashnode *, void *);
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static int write_defs (cpp_reader *, cpp_hashnode *, void *);
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static int save_macros (cpp_reader *, cpp_hashnode *, void *);
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static int _cpp_save_pushed_macros (cpp_reader *, FILE *);
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static int _cpp_restore_pushed_macros (cpp_reader *, FILE *);
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/* This structure represents a macro definition on disk. */
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struct macrodef_struct
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{
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unsigned int definition_length;
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unsigned short name_length;
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unsigned short flags;
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};
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/* This is how we write out a macro definition.
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Suitable for being called by cpp_forall_identifiers. */
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static int
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write_macdef (cpp_reader *pfile, cpp_hashnode *hn, void *file_p)
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{
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FILE *f = (FILE *) file_p;
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switch (hn->type)
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{
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case NT_VOID:
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if (! (hn->flags & NODE_POISONED))
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return 1;
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case NT_MACRO:
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if ((hn->flags & NODE_BUILTIN)
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&& (!pfile->cb.user_builtin_macro
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|| !pfile->cb.user_builtin_macro (pfile, hn)))
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return 1;
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{
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struct macrodef_struct s;
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const unsigned char *defn;
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s.name_length = NODE_LEN (hn);
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s.flags = hn->flags & NODE_POISONED;
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if (hn->type == NT_MACRO)
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{
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defn = cpp_macro_definition (pfile, hn);
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s.definition_length = ustrlen (defn);
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}
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else
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{
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defn = NODE_NAME (hn);
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s.definition_length = s.name_length;
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}
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if (fwrite (&s, sizeof (s), 1, f) != 1
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|| fwrite (defn, 1, s.definition_length, f) != s.definition_length)
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{
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cpp_errno (pfile, CPP_DL_ERROR,
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"while writing precompiled header");
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return 0;
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}
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}
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return 1;
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case NT_ASSERTION:
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/* Not currently implemented. */
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return 1;
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default:
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abort ();
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}
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}
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/* This structure records the names of the defined macros.
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It's also used as a callback structure for size_initial_idents
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and save_idents. */
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struct cpp_savedstate
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{
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/* A hash table of the defined identifiers. */
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htab_t definedhash;
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/* The size of the definitions of those identifiers (the size of
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'definedstrs'). */
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size_t hashsize;
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/* Number of definitions */
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size_t n_defs;
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/* Array of definitions. In cpp_write_pch_deps it is used for sorting. */
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cpp_hashnode **defs;
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/* Space for the next definition. Definitions are null-terminated
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strings. */
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unsigned char *definedstrs;
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};
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/* Save this identifier into the state: put it in the hash table,
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put the definition in 'definedstrs'. */
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static int
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save_idents (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn, void *ss_p)
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{
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struct cpp_savedstate *const ss = (struct cpp_savedstate *)ss_p;
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if (hn->type != NT_VOID)
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{
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struct cpp_string news;
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void **slot;
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news.len = NODE_LEN (hn);
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news.text= NODE_NAME (hn);
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slot = htab_find_slot (ss->definedhash, &news, INSERT);
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if (*slot == NULL)
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{
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struct cpp_string *sp;
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unsigned char *text;
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sp = XNEW (struct cpp_string);
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*slot = sp;
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sp->len = NODE_LEN (hn);
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sp->text = text = XNEWVEC (unsigned char, NODE_LEN (hn));
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memcpy (text, NODE_NAME (hn), NODE_LEN (hn));
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}
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}
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return 1;
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}
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/* Hash some memory in a generic way. */
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static hashval_t
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hashmem (const void *p_p, size_t sz)
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{
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const unsigned char *p = (const unsigned char *)p_p;
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size_t i;
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hashval_t h;
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h = 0;
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for (i = 0; i < sz; i++)
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h = h * 67 - (*p++ - 113);
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return h;
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}
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/* Hash a cpp string for the hashtable machinery. */
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static hashval_t
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cpp_string_hash (const void *a_p)
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{
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const struct cpp_string *a = (const struct cpp_string *) a_p;
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return hashmem (a->text, a->len);
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}
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/* Compare two cpp strings for the hashtable machinery. */
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static int
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cpp_string_eq (const void *a_p, const void *b_p)
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{
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const struct cpp_string *a = (const struct cpp_string *) a_p;
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const struct cpp_string *b = (const struct cpp_string *) b_p;
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return (a->len == b->len
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&& memcmp (a->text, b->text, a->len) == 0);
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}
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/* Free memory associated with cpp_string. */
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static void
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cpp_string_free (void *a_p)
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{
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struct cpp_string *a = (struct cpp_string *) a_p;
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free ((void *) a->text);
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free (a);
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}
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/* Save the current definitions of the cpp_reader for dependency
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checking purposes. When writing a precompiled header, this should
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be called at the same point in the compilation as cpp_valid_state
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would be called when reading the precompiled header back in. */
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int
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cpp_save_state (cpp_reader *r, FILE *f)
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{
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/* Save the list of non-void identifiers for the dependency checking. */
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r->savedstate = XNEW (struct cpp_savedstate);
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r->savedstate->definedhash = htab_create (100, cpp_string_hash,
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cpp_string_eq, cpp_string_free);
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cpp_forall_identifiers (r, save_idents, r->savedstate);
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/* Write out the list of defined identifiers. */
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cpp_forall_identifiers (r, write_macdef, f);
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return 0;
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}
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/* Calculate the 'hashsize' field of the saved state. */
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static int
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count_defs (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn, void *ss_p)
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{
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struct cpp_savedstate *const ss = (struct cpp_savedstate *)ss_p;
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switch (hn->type)
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{
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case NT_MACRO:
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if (hn->flags & NODE_BUILTIN)
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return 1;
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/* else fall through. */
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case NT_VOID:
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{
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struct cpp_string news;
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void **slot;
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news.len = NODE_LEN (hn);
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news.text = NODE_NAME (hn);
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slot = (void **) htab_find (ss->definedhash, &news);
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if (slot == NULL)
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{
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ss->hashsize += NODE_LEN (hn) + 1;
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ss->n_defs += 1;
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}
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}
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return 1;
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case NT_ASSERTION:
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/* Not currently implemented. */
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return 1;
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default:
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abort ();
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}
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}
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/* Collect the identifiers into the state's string table. */
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static int
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write_defs (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn, void *ss_p)
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{
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struct cpp_savedstate *const ss = (struct cpp_savedstate *)ss_p;
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switch (hn->type)
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{
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case NT_MACRO:
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if (hn->flags & NODE_BUILTIN)
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return 1;
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/* else fall through. */
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case NT_VOID:
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{
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struct cpp_string news;
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void **slot;
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news.len = NODE_LEN (hn);
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news.text = NODE_NAME (hn);
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slot = (void **) htab_find (ss->definedhash, &news);
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if (slot == NULL)
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{
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ss->defs[ss->n_defs] = hn;
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ss->n_defs += 1;
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}
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}
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return 1;
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case NT_ASSERTION:
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/* Not currently implemented. */
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return 1;
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default:
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abort ();
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}
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}
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/* Comparison function for qsort. The arguments point to pointers of
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type ht_hashnode *. */
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static int
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comp_hashnodes (const void *px, const void *py)
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{
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cpp_hashnode *x = *(cpp_hashnode **) px;
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cpp_hashnode *y = *(cpp_hashnode **) py;
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return ustrcmp (NODE_NAME (x), NODE_NAME (y));
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}
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/* Write out the remainder of the dependency information. This should be
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called after the PCH is ready to be saved. */
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int
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cpp_write_pch_deps (cpp_reader *r, FILE *f)
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{
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struct macrodef_struct z;
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struct cpp_savedstate *const ss = r->savedstate;
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unsigned char *definedstrs;
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size_t i;
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/* Collect the list of identifiers which have been seen and
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weren't defined to anything previously. */
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ss->hashsize = 0;
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ss->n_defs = 0;
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cpp_forall_identifiers (r, count_defs, ss);
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ss->defs = XNEWVEC (cpp_hashnode *, ss->n_defs);
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ss->n_defs = 0;
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cpp_forall_identifiers (r, write_defs, ss);
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/* Sort the list, copy it into a buffer, and write it out. */
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qsort (ss->defs, ss->n_defs, sizeof (cpp_hashnode *), &comp_hashnodes);
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definedstrs = ss->definedstrs = XNEWVEC (unsigned char, ss->hashsize);
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for (i = 0; i < ss->n_defs; ++i)
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{
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size_t len = NODE_LEN (ss->defs[i]);
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memcpy (definedstrs, NODE_NAME (ss->defs[i]), len + 1);
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definedstrs += len + 1;
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}
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memset (&z, 0, sizeof (z));
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z.definition_length = ss->hashsize;
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if (fwrite (&z, sizeof (z), 1, f) != 1
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|| fwrite (ss->definedstrs, ss->hashsize, 1, f) != 1)
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{
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cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header");
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return -1;
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}
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free (ss->definedstrs);
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free (ss->defs);
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htab_delete (ss->definedhash);
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/* Free the saved state. */
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free (ss);
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r->savedstate = NULL;
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/* Save the next value of __COUNTER__. */
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if (fwrite (&r->counter, sizeof (r->counter), 1, f) != 1)
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{
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cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header");
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return -1;
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}
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return 0;
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}
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/* Write out the definitions of the preprocessor, in a form suitable for
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cpp_read_state. */
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int
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cpp_write_pch_state (cpp_reader *r, FILE *f)
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{
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if (!r->deps)
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r->deps = deps_init ();
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if (deps_save (r->deps, f) != 0)
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{
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cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header");
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return -1;
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}
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if (! _cpp_save_file_entries (r, f))
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{
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cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header");
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return -1;
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}
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/* Save the next __COUNTER__ value. When we include a precompiled header,
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we need to start at the offset we would have if the header had been
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included normally. */
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if (fwrite (&r->counter, sizeof (r->counter), 1, f) != 1)
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{
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cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header");
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return -1;
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}
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/* Write saved macros. */
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if (! _cpp_save_pushed_macros (r, f))
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{
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cpp_errno (r, CPP_DL_ERROR, "while writing precompiled header");
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return -1;
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}
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return 0;
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}
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static int
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_cpp_restore_pushed_macros (cpp_reader *r, FILE *f)
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{
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size_t count_saved = 0;
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size_t i;
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struct def_pragma_macro *p;
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size_t nlen;
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uchar *defn;
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size_t defnlen;
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if (fread (&count_saved, sizeof (count_saved), 1, f) != 1)
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return 0;
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if (! count_saved)
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return 1;
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for (i = 0; i < count_saved; i++)
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{
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if (fread (&nlen, sizeof (nlen), 1, f) != 1)
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return 0;
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p = XNEW (struct def_pragma_macro);
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memset (p, 0, sizeof (struct def_pragma_macro));
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p->name = XNEWVAR (char, nlen + 1);
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p->name[nlen] = 0;
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if (fread (p->name, nlen, 1, f) != 1)
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return 0;
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if (fread (&defnlen, sizeof (defnlen), 1, f) != 1)
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return 0;
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if (defnlen == 0)
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p->is_undef = 1;
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else
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{
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defn = XNEWVEC (uchar, defnlen + 1);
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defn[defnlen] = 0;
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if (fread (defn, defnlen, 1, f) != 1)
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return 0;
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p->definition = defn;
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if (fread (&(p->line), sizeof (source_location), 1, f) != 1)
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return 0;
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defnlen = 0;
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if (fread (&defnlen, sizeof (defnlen), 1, f) != 1)
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return 0;
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p->syshdr = ((defnlen & 1) != 0 ? 1 : 0);
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p->used = ((defnlen & 2) != 0 ? 1 : 0);
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}
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p->next = r->pushed_macros;
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r->pushed_macros = p;
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}
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return 1;
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}
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static int
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_cpp_save_pushed_macros (cpp_reader *r, FILE *f)
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{
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size_t count_saved = 0;
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size_t i;
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struct def_pragma_macro *p,**pp;
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size_t defnlen;
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/* Get count. */
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p = r->pushed_macros;
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while (p != NULL)
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{
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count_saved++;
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p = p->next;
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}
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if (fwrite (&count_saved, sizeof (count_saved), 1, f) != 1)
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return 0;
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if (!count_saved)
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return 1;
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pp = (struct def_pragma_macro **) alloca (sizeof (struct def_pragma_macro *)
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* count_saved);
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/* Store them in reverse order. */
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p = r->pushed_macros;
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i = count_saved;
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while (p != NULL)
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{
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--i;
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pp[i] = p;
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p = p->next;
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}
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for (i = 0; i < count_saved; i++)
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{
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defnlen = strlen (pp[i]->name);
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if (fwrite (&defnlen, sizeof (size_t), 1, f) != 1
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|| fwrite (pp[i]->name, defnlen, 1, f) != 1)
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return 0;
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if (pp[i]->is_undef)
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{
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defnlen = 0;
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if (fwrite (&defnlen, sizeof (size_t), 1, f) != 1)
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return 0;
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}
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else
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{
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defnlen = ustrlen (pp[i]->definition);
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if (fwrite (&defnlen, sizeof (size_t), 1, f) != 1
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|| fwrite (pp[i]->definition, defnlen, 1, f) != 1)
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return 0;
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if (fwrite (&(pp[i]->line), sizeof (source_location), 1, f) != 1)
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return 0;
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defnlen = 0;
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defnlen |= (pp[i]->syshdr != 0 ? 1 : 0);
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defnlen |= (pp[i]->used != 0 ? 2 : 0);
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if (fwrite (&defnlen, sizeof (defnlen), 1, f) != 1)
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return 0;
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}
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}
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return 1;
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}
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/* Data structure to transform hash table nodes into a sorted list */
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struct ht_node_list
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{
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/* Array of nodes */
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cpp_hashnode **defs;
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/* Number of nodes in the array */
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size_t n_defs;
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/* Size of the allocated array */
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size_t asize;
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};
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/* Callback for collecting identifiers from hash table */
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static int
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collect_ht_nodes (cpp_reader *pfile ATTRIBUTE_UNUSED, cpp_hashnode *hn,
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|
void *nl_p)
|
|
{
|
|
struct ht_node_list *const nl = (struct ht_node_list *)nl_p;
|
|
|
|
if (hn->type != NT_VOID || hn->flags & NODE_POISONED)
|
|
{
|
|
if (nl->n_defs == nl->asize)
|
|
{
|
|
nl->asize *= 2;
|
|
nl->defs = XRESIZEVEC (cpp_hashnode *, nl->defs, nl->asize);
|
|
}
|
|
|
|
nl->defs[nl->n_defs] = hn;
|
|
++nl->n_defs;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Return nonzero if FD is a precompiled header which is consistent
|
|
with the preprocessor's current definitions. It will be consistent
|
|
when:
|
|
|
|
- anything that was defined just before the PCH was generated
|
|
is defined the same way now; and
|
|
- anything that was not defined then, but is defined now, was not
|
|
used by the PCH.
|
|
|
|
NAME is used to print warnings if `warn_invalid_pch' is set in the
|
|
reader's flags.
|
|
*/
|
|
|
|
int
|
|
cpp_valid_state (cpp_reader *r, const char *name, int fd)
|
|
{
|
|
struct macrodef_struct m;
|
|
size_t namebufsz = 256;
|
|
unsigned char *namebuf = XNEWVEC (unsigned char, namebufsz);
|
|
unsigned char *undeftab = NULL;
|
|
struct ht_node_list nl = { 0, 0, 0 };
|
|
unsigned char *first, *last;
|
|
unsigned int i;
|
|
unsigned int counter;
|
|
|
|
/* Read in the list of identifiers that must be defined
|
|
Check that they are defined in the same way. */
|
|
for (;;)
|
|
{
|
|
cpp_hashnode *h;
|
|
const unsigned char *newdefn;
|
|
|
|
if (read (fd, &m, sizeof (m)) != sizeof (m))
|
|
goto error;
|
|
|
|
if (m.name_length == 0)
|
|
break;
|
|
|
|
/* If this file is already preprocessed, there won't be any
|
|
macros defined, and that's OK. */
|
|
if (CPP_OPTION (r, preprocessed))
|
|
{
|
|
if (lseek (fd, m.definition_length, SEEK_CUR) == -1)
|
|
goto error;
|
|
continue;
|
|
}
|
|
|
|
if (m.definition_length > namebufsz)
|
|
{
|
|
free (namebuf);
|
|
namebufsz = m.definition_length + 256;
|
|
namebuf = XNEWVEC (unsigned char, namebufsz);
|
|
}
|
|
|
|
if ((size_t)read (fd, namebuf, m.definition_length)
|
|
!= m.definition_length)
|
|
goto error;
|
|
|
|
h = cpp_lookup (r, namebuf, m.name_length);
|
|
if (m.flags & NODE_POISONED
|
|
|| h->flags & NODE_POISONED)
|
|
{
|
|
if (CPP_OPTION (r, warn_invalid_pch))
|
|
cpp_warning_syshdr (r, CPP_W_INVALID_PCH,
|
|
"%s: not used because `%.*s' is poisoned",
|
|
name, m.name_length, namebuf);
|
|
goto fail;
|
|
}
|
|
|
|
if (h->type != NT_MACRO)
|
|
{
|
|
/* It's ok if __GCC_HAVE_DWARF2_CFI_ASM becomes undefined,
|
|
as in, when the PCH file is created with -g and we're
|
|
attempting to use it without -g. Restoring the PCH file
|
|
is supposed to bring in this definition *and* enable the
|
|
generation of call frame information, so that precompiled
|
|
definitions that take this macro into accout, to decide
|
|
what asm to emit, won't issue .cfi directives when the
|
|
compiler doesn't. */
|
|
if (!(h->flags & NODE_USED)
|
|
&& m.name_length == sizeof ("__GCC_HAVE_DWARF2_CFI_ASM") - 1
|
|
&& !memcmp (namebuf, "__GCC_HAVE_DWARF2_CFI_ASM", m.name_length))
|
|
continue;
|
|
|
|
if (CPP_OPTION (r, warn_invalid_pch))
|
|
cpp_warning_syshdr (r, CPP_W_INVALID_PCH,
|
|
"%s: not used because `%.*s' not defined",
|
|
name, m.name_length, namebuf);
|
|
goto fail;
|
|
}
|
|
|
|
newdefn = cpp_macro_definition (r, h);
|
|
|
|
if (m.definition_length != ustrlen (newdefn)
|
|
|| memcmp (namebuf, newdefn, m.definition_length) != 0)
|
|
{
|
|
if (CPP_OPTION (r, warn_invalid_pch))
|
|
cpp_warning_syshdr (r, CPP_W_INVALID_PCH,
|
|
"%s: not used because `%.*s' defined as `%s' not `%.*s'",
|
|
name, m.name_length, namebuf, newdefn + m.name_length,
|
|
m.definition_length - m.name_length,
|
|
namebuf + m.name_length);
|
|
goto fail;
|
|
}
|
|
}
|
|
free (namebuf);
|
|
namebuf = NULL;
|
|
|
|
/* Read in the list of identifiers that must not be defined.
|
|
Check that they really aren't. */
|
|
undeftab = XNEWVEC (unsigned char, m.definition_length);
|
|
if ((size_t) read (fd, undeftab, m.definition_length) != m.definition_length)
|
|
goto error;
|
|
|
|
/* Collect identifiers from the current hash table. */
|
|
nl.n_defs = 0;
|
|
nl.asize = 10;
|
|
nl.defs = XNEWVEC (cpp_hashnode *, nl.asize);
|
|
cpp_forall_identifiers (r, &collect_ht_nodes, &nl);
|
|
qsort (nl.defs, nl.n_defs, sizeof (cpp_hashnode *), &comp_hashnodes);
|
|
|
|
/* Loop through nl.defs and undeftab, both of which are sorted lists.
|
|
There should be no matches. */
|
|
first = undeftab;
|
|
last = undeftab + m.definition_length;
|
|
i = 0;
|
|
|
|
while (first < last && i < nl.n_defs)
|
|
{
|
|
int cmp = ustrcmp (first, NODE_NAME (nl.defs[i]));
|
|
|
|
if (cmp < 0)
|
|
first += ustrlen (first) + 1;
|
|
else if (cmp > 0)
|
|
++i;
|
|
else
|
|
{
|
|
if (CPP_OPTION (r, warn_invalid_pch))
|
|
cpp_warning_syshdr (r, CPP_W_INVALID_PCH,
|
|
"%s: not used because `%s' is defined",
|
|
name, first);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
free(nl.defs);
|
|
nl.defs = NULL;
|
|
free (undeftab);
|
|
undeftab = NULL;
|
|
|
|
/* Read in the next value of __COUNTER__.
|
|
Check that (a) __COUNTER__ was not used in the pch or (b) __COUNTER__
|
|
has not been used in this translation unit. */
|
|
if (read (fd, &counter, sizeof (counter)) != sizeof (counter))
|
|
goto error;
|
|
if (counter && r->counter)
|
|
{
|
|
if (CPP_OPTION (r, warn_invalid_pch))
|
|
cpp_warning_syshdr (r, CPP_W_INVALID_PCH,
|
|
"%s: not used because `__COUNTER__' is invalid",
|
|
name);
|
|
goto fail;
|
|
}
|
|
|
|
/* We win! */
|
|
return 0;
|
|
|
|
error:
|
|
cpp_errno (r, CPP_DL_ERROR, "while reading precompiled header");
|
|
|
|
fail:
|
|
free (namebuf);
|
|
free (undeftab);
|
|
free (nl.defs);
|
|
return 1;
|
|
}
|
|
|
|
/* Save all the existing macros. */
|
|
|
|
struct save_macro_data
|
|
{
|
|
uchar **defns;
|
|
size_t count;
|
|
size_t array_size;
|
|
char **saved_pragmas;
|
|
};
|
|
|
|
/* Save the definition of a single macro, so that it will persist
|
|
across a PCH restore. Because macro data is in GCed memory, which
|
|
will be blown away by PCH, it must be temporarily copied to
|
|
malloced memory. (The macros will refer to identifier nodes which
|
|
are also GCed and so on, so the copying is done by turning them
|
|
into self-contained strings.) The assumption is that most macro
|
|
definitions will come from the PCH file, not from the compilation
|
|
before the PCH file is loaded, so it doesn't matter that this is
|
|
a little expensive.
|
|
|
|
It would reduce the cost even further if macros defined in the PCH
|
|
file were not saved in this way, but this is not done (yet), except
|
|
for builtins, and for #assert by default. */
|
|
|
|
static int
|
|
save_macros (cpp_reader *r, cpp_hashnode *h, void *data_p)
|
|
{
|
|
struct save_macro_data *data = (struct save_macro_data *)data_p;
|
|
|
|
if ((h->flags & NODE_BUILTIN)
|
|
&& h->type == NT_MACRO
|
|
&& r->cb.user_builtin_macro)
|
|
r->cb.user_builtin_macro (r, h);
|
|
|
|
if (h->type != NT_VOID
|
|
&& (h->flags & NODE_BUILTIN) == 0)
|
|
{
|
|
if (data->count == data->array_size)
|
|
{
|
|
data->array_size *= 2;
|
|
data->defns = XRESIZEVEC (uchar *, data->defns, (data->array_size));
|
|
}
|
|
|
|
switch (h->type)
|
|
{
|
|
case NT_ASSERTION:
|
|
/* Not currently implemented. */
|
|
return 1;
|
|
|
|
case NT_MACRO:
|
|
{
|
|
const uchar * defn = cpp_macro_definition (r, h);
|
|
size_t defnlen = ustrlen (defn);
|
|
|
|
data->defns[data->count] = (uchar *) xmemdup (defn, defnlen,
|
|
defnlen + 2);
|
|
data->defns[data->count][defnlen] = '\n';
|
|
}
|
|
break;
|
|
|
|
default:
|
|
abort ();
|
|
}
|
|
data->count++;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* Prepare to restore the state, by saving the currently-defined
|
|
macros in 'data'. */
|
|
|
|
void
|
|
cpp_prepare_state (cpp_reader *r, struct save_macro_data **data)
|
|
{
|
|
struct save_macro_data *d = XNEW (struct save_macro_data);
|
|
|
|
d->array_size = 512;
|
|
d->defns = XNEWVEC (uchar *, d->array_size);
|
|
d->count = 0;
|
|
cpp_forall_identifiers (r, save_macros, d);
|
|
d->saved_pragmas = _cpp_save_pragma_names (r);
|
|
*data = d;
|
|
}
|
|
|
|
/* Given a precompiled header that was previously determined to be valid,
|
|
apply all its definitions (and undefinitions) to the current state.
|
|
DEPNAME is passed to deps_restore. */
|
|
|
|
int
|
|
cpp_read_state (cpp_reader *r, const char *name, FILE *f,
|
|
struct save_macro_data *data)
|
|
{
|
|
size_t i;
|
|
struct lexer_state old_state;
|
|
unsigned int counter;
|
|
|
|
/* Restore spec_nodes, which will be full of references to the old
|
|
hashtable entries and so will now be invalid. */
|
|
{
|
|
struct spec_nodes *s = &r->spec_nodes;
|
|
s->n_defined = cpp_lookup (r, DSC("defined"));
|
|
s->n_true = cpp_lookup (r, DSC("true"));
|
|
s->n_false = cpp_lookup (r, DSC("false"));
|
|
s->n__VA_ARGS__ = cpp_lookup (r, DSC("__VA_ARGS__"));
|
|
s->n__has_include__ = cpp_lookup (r, DSC("__has_include__"));
|
|
s->n__has_include_next__ = cpp_lookup (r, DSC("__has_include_next__"));
|
|
}
|
|
|
|
old_state = r->state;
|
|
r->state.in_directive = 1;
|
|
r->state.prevent_expansion = 1;
|
|
r->state.angled_headers = 0;
|
|
|
|
/* Run through the carefully-saved macros, insert them. */
|
|
for (i = 0; i < data->count; i++)
|
|
{
|
|
cpp_hashnode *h;
|
|
size_t namelen;
|
|
uchar *defn;
|
|
|
|
namelen = ustrcspn (data->defns[i], "( \n");
|
|
h = cpp_lookup (r, data->defns[i], namelen);
|
|
defn = data->defns[i] + namelen;
|
|
|
|
/* The PCH file is valid, so we know that if there is a definition
|
|
from the PCH file it must be the same as the one we had
|
|
originally, and so do not need to restore it. */
|
|
if (h->type == NT_VOID)
|
|
{
|
|
if (cpp_push_buffer (r, defn, ustrchr (defn, '\n') - defn, true)
|
|
!= NULL)
|
|
{
|
|
_cpp_clean_line (r);
|
|
if (!_cpp_create_definition (r, h))
|
|
abort ();
|
|
_cpp_pop_buffer (r);
|
|
}
|
|
else
|
|
abort ();
|
|
}
|
|
|
|
free (data->defns[i]);
|
|
}
|
|
r->state = old_state;
|
|
|
|
_cpp_restore_pragma_names (r, data->saved_pragmas);
|
|
|
|
free (data);
|
|
|
|
if (deps_restore (r->deps, f, CPP_OPTION (r, restore_pch_deps) ? name : NULL)
|
|
!= 0)
|
|
goto error;
|
|
|
|
if (! _cpp_read_file_entries (r, f))
|
|
goto error;
|
|
|
|
if (fread (&counter, sizeof (counter), 1, f) != 1)
|
|
goto error;
|
|
|
|
if (!r->counter)
|
|
r->counter = counter;
|
|
|
|
/* Read pushed macros. */
|
|
if (! _cpp_restore_pushed_macros (r, f))
|
|
goto error;
|
|
return 0;
|
|
|
|
error:
|
|
cpp_errno (r, CPP_DL_ERROR, "while reading precompiled header");
|
|
return -1;
|
|
}
|