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/* Precompiled header implementation for the C languages.
Copyright (C) 2000, 2002 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "cpplib.h"
#include "tree.h"
#include "c-common.h"
#include "output.h"
#include "toplev.h"
#include "debug.h"
#include "c-pragma.h"
#include "ggc.h"
struct c_pch_header
{
unsigned long asm_size;
};
static const char pch_ident[8] = "gpchC010";
static FILE *pch_outfile;
extern char *asm_file_name;
static off_t asm_file_startpos;
void
pch_init ()
{
FILE *f;
if (pch_file)
{
/* We're precompiling a header file, so when it's actually used,
it'll be at least one level deep. */
(*debug_hooks->start_source_file) (lineno, input_filename);
f = fopen (pch_file, "w+b");
if (f == NULL)
fatal_io_error ("can't open %s", pch_file);
pch_outfile = f;
if (fwrite (pch_ident, sizeof (pch_ident), 1, f) != 1)
fatal_io_error ("can't write to %s", pch_file);
/* We need to be able to re-read the output. */
/* The driver always provides a valid -o option. */
if (asm_file_name == NULL
|| strcmp (asm_file_name, "-") == 0)
fatal_error ("`%s' is not a valid output file", asm_file_name);
asm_file_startpos = ftello (asm_out_file);
cpp_save_state (parse_in, f);
}
}
void
c_common_write_pch ()
{
char *buf;
off_t asm_file_end;
off_t written;
struct c_pch_header h;
cpp_write_pch_deps (parse_in, pch_outfile);
asm_file_end = ftello (asm_out_file);
h.asm_size = asm_file_end - asm_file_startpos;
if (fwrite (&h, sizeof (h), 1, pch_outfile) != 1)
fatal_io_error ("can't write %s", pch_file);
buf = xmalloc (16384);
fflush (asm_out_file);
if (fseeko (asm_out_file, asm_file_startpos, SEEK_SET) != 0)
fatal_io_error ("can't seek in %s", asm_file_name);
for (written = asm_file_startpos; written < asm_file_end; )
{
off_t size = asm_file_end - written;
if (size > 16384)
size = 16384;
if (fread (buf, size, 1, asm_out_file) != 1)
fatal_io_error ("can't read %s", asm_file_name);
if (fwrite (buf, size, 1, pch_outfile) != 1)
fatal_io_error ("can't write %s", pch_file);
written += size;
}
free (buf);
gt_pch_save (pch_outfile);
cpp_write_pch_state (parse_in, pch_outfile);
fclose (pch_outfile);
}
int
c_common_valid_pch (pfile, name, fd)
cpp_reader *pfile;
const char *name;
int fd;
{
int sizeread;
int result;
char ident[sizeof (pch_ident)];
if (! allow_pch)
return 2;
/* Perform a quick test of whether this is a valid
precompiled header for C. */
sizeread = read (fd, ident, sizeof (pch_ident));
if (sizeread == -1)
{
fatal_io_error ("can't read %s", name);
return 2;
}
else if (sizeread != sizeof (pch_ident))
return 2;
if (memcmp (ident, pch_ident, sizeof (pch_ident)) != 0)
{
if (cpp_get_options (pfile)->warn_invalid_pch)
{
if (memcmp (ident, pch_ident, 5) == 0)
/* It's a PCH, for the right language, but has the wrong version.
*/
cpp_error (pfile, DL_WARNING,
"%s: not compatible with this GCC version", name);
else if (memcmp (ident, pch_ident, 4) == 0)
/* It's a PCH for the wrong language. */
cpp_error (pfile, DL_WARNING, "%s: not for C language", name);
else
/* Not any kind of PCH. */
cpp_error (pfile, DL_WARNING, "%s: not a PCH file", name);
}
return 2;
}
/* Check the preprocessor macros are the same as when the PCH was
generated. */
result = cpp_valid_state (pfile, name, fd);
if (result == -1)
return 2;
else
return result == 0;
}
void
c_common_read_pch (pfile, name, fd, orig_name)
cpp_reader *pfile;
const char *name;
int fd;
const char *orig_name;
{
FILE *f;
struct c_pch_header h;
char *buf;
unsigned long written;
struct save_macro_data *smd;
/* Before we wrote the file, we started a source file, so we have to start
one here to match. */
(*debug_hooks->start_source_file) (lineno, orig_name);
f = fdopen (fd, "rb");
if (f == NULL)
{
cpp_errno (pfile, DL_ERROR, "calling fdopen");
return;
}
allow_pch = 0;
if (fread (&h, sizeof (h), 1, f) != 1)
{
cpp_errno (pfile, DL_ERROR, "reading");
return;
}
buf = xmalloc (16384);
for (written = 0; written < h.asm_size; )
{
off_t size = h.asm_size - written;
if (size > 16384)
size = 16384;
if (fread (buf, size, 1, f) != 1
|| fwrite (buf, size, 1, asm_out_file) != 1)
cpp_errno (pfile, DL_ERROR, "reading");
written += size;
}
free (buf);
cpp_prepare_state (pfile, &smd);
gt_pch_restore (f);
if (cpp_read_state (pfile, name, f, smd) != 0)
return;
fclose (f);
(*debug_hooks->end_source_file) (lineno);
}
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