/* Precompiled header implementation for the C languages.
- Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
This file is part of GCC.
GCC 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)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "ggc.h"
#include "langhooks.h"
#include "hosthooks.h"
+#include "target.h"
+#include "opts.h"
+#include "timevar.h"
-/* This structure is read very early when validating the PCH, and
- might be read for a PCH which is for a completely different compiler
- for a different operating system. Thus, it should really only contain
- 'unsigned char' entries, at least in the initial entries.
+/* This is a list of flag variables that must match exactly, and their
+ names for the error message. The possible values for *flag_var must
+ fit in a 'signed char'. */
- If you add or change entries before version_length, you should increase
- the version number in get_ident(). */
+static const struct c_pch_matching
+{
+ int *flag_var;
+ const char *flag_name;
+} pch_matching[] = {
+ { &flag_exceptions, "-fexceptions" },
+};
+
+enum {
+ MATCH_SIZE = ARRAY_SIZE (pch_matching)
+};
+
+/* The value of the checksum in the dummy compiler that is actually
+ checksummed. That compiler should never be run. */
+static const char no_checksum[16] = { 0 };
+
+/* Information about flags and suchlike that affect PCH validity.
+
+ Before this structure is read, both an initial 8-character identification
+ string, and a 16-byte checksum, have been read and validated. */
struct c_pch_validity
{
- unsigned char host_machine_length;
- unsigned char target_machine_length;
- unsigned char version_length;
unsigned char debug_info_type;
+ signed char match[MATCH_SIZE];
void (*pch_init) (void);
+ size_t target_data_length;
};
-struct c_pch_header
+struct c_pch_header
{
unsigned long asm_size;
};
/* The position in the assembler output file when pch_init was called. */
static long asm_file_startpos;
-/* The host and target machines. */
-static const char host_machine[] = HOST_MACHINE;
-static const char target_machine[] = TARGET_MACHINE;
-
static const char *get_ident (void);
/* Compute an appropriate 8-byte magic number for the PCH file, so that
format. */
static const char *
-get_ident(void)
+get_ident (void)
{
static char result[IDENT_LENGTH];
- static const char template[IDENT_LENGTH] = "gpch.012";
+ static const char templ[] = "gpch.013";
static const char c_language_chars[] = "Co+O";
-
- memcpy (result, template, IDENT_LENGTH);
+
+ memcpy (result, templ, IDENT_LENGTH);
result[4] = c_language_chars[c_language];
return result;
}
-/* Prepare to write a PCH file. This is called at the start of
- compilation. */
+/* Prepare to write a PCH file, if one is being written. This is
+ called at the start of compilation.
+
+ Also, print out the executable checksum if -fverbose-asm is in effect. */
void
pch_init (void)
{
FILE *f;
struct c_pch_validity v;
-
- if (! pch_file)
+ void *target_validity;
+ static const char partial_pch[] = "gpcWrite";
+
+#ifdef ASM_COMMENT_START
+ if (flag_verbose_asm)
+ {
+ fprintf (asm_out_file, "%s ", ASM_COMMENT_START);
+ c_common_print_pch_checksum (asm_out_file);
+ fputc ('\n', asm_out_file);
+ }
+#endif
+
+ if (!pch_file)
return;
-
+
f = fopen (pch_file, "w+b");
if (f == NULL)
- fatal_error ("can't open %s: %m", pch_file);
+ fatal_error ("can%'t create precompiled header %s: %m", pch_file);
pch_outfile = f;
-
- if (strlen (host_machine) > 255 || strlen (target_machine) > 255
- || strlen (version_string) > 255)
- abort ();
-
- v.host_machine_length = strlen (host_machine);
- v.target_machine_length = strlen (target_machine);
- v.version_length = strlen (version_string);
-
+
+ gcc_assert (memcmp (executable_checksum, no_checksum, 16) != 0);
+
+ memset (&v, '\0', sizeof (v));
v.debug_info_type = write_symbols;
+ {
+ size_t i;
+ for (i = 0; i < MATCH_SIZE; i++)
+ {
+ v.match[i] = *pch_matching[i].flag_var;
+ gcc_assert (v.match[i] == *pch_matching[i].flag_var);
+ }
+ }
v.pch_init = &pch_init;
- if (fwrite (get_ident(), IDENT_LENGTH, 1, f) != 1
+ target_validity = targetm.get_pch_validity (&v.target_data_length);
+
+ if (fwrite (partial_pch, IDENT_LENGTH, 1, f) != 1
+ || fwrite (executable_checksum, 16, 1, f) != 1
|| fwrite (&v, sizeof (v), 1, f) != 1
- || fwrite (host_machine, v.host_machine_length, 1, f) != 1
- || fwrite (target_machine, v.target_machine_length, 1, f) != 1
- || fwrite (version_string, v.version_length, 1, f) != 1)
- fatal_error ("can't write to %s: %m", pch_file);
+ || fwrite (target_validity, v.target_data_length, 1, f) != 1)
+ fatal_error ("can%'t write to %s: %m", 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);
-
+ fatal_error ("%qs is not a valid output file", asm_file_name);
+
asm_file_startpos = ftell (asm_out_file);
-
+
/* Let the debugging format deal with the PCHness. */
(*debug_hooks->handle_pch) (0);
-
+
cpp_save_state (parse_in, f);
}
long written;
struct c_pch_header h;
+ timevar_push (TV_PCH_SAVE);
+
(*debug_hooks->handle_pch) (1);
cpp_write_pch_deps (parse_in, pch_outfile);
asm_file_end = ftell (asm_out_file);
h.asm_size = asm_file_end - asm_file_startpos;
-
+
if (fwrite (&h, sizeof (h), 1, pch_outfile) != 1)
- fatal_error ("can't write %s: %m", pch_file);
-
- buf = xmalloc (16384);
- fflush (asm_out_file);
+ fatal_error ("can%'t write %s: %m", pch_file);
+
+ buf = XNEWVEC (char, 16384);
if (fseek (asm_out_file, asm_file_startpos, SEEK_SET) != 0)
- fatal_error ("can't seek in %s: %m", asm_file_name);
+ fatal_error ("can%'t seek in %s: %m", asm_file_name);
for (written = asm_file_startpos; written < asm_file_end; )
{
if (size > 16384)
size = 16384;
if (fread (buf, size, 1, asm_out_file) != 1)
- fatal_error ("can't read %s: %m", asm_file_name);
+ fatal_error ("can%'t read %s: %m", asm_file_name);
if (fwrite (buf, size, 1, pch_outfile) != 1)
- fatal_error ("can't write %s: %m", pch_file);
+ fatal_error ("can%'t write %s: %m", pch_file);
written += size;
}
free (buf);
- /* asm_out_file can be written afterwards, so must be flushed first. */
- fflush (asm_out_file);
+ /* asm_out_file can be written afterwards, so fseek to clear
+ _IOREAD flag. */
+ if (fseek (asm_out_file, 0, SEEK_END) != 0)
+ fatal_error ("can%'t seek in %s: %m", asm_file_name);
gt_pch_save (pch_outfile);
+
+ timevar_push (TV_PCH_CPP_SAVE);
cpp_write_pch_state (parse_in, pch_outfile);
+ timevar_pop (TV_PCH_CPP_SAVE);
+
+ if (fseek (pch_outfile, 0, SEEK_SET) != 0
+ || fwrite (get_ident (), IDENT_LENGTH, 1, pch_outfile) != 1)
+ fatal_error ("can%'t write %s: %m", pch_file);
fclose (pch_outfile);
+
+ timevar_pop (TV_PCH_SAVE);
}
-/* Check the PCH file called NAME, open on FD, to see if it can be used
- in this compilation. */
+/* Check the PCH file called NAME, open on FD, to see if it can be
+ used in this compilation. Return 1 if valid, 0 if the file can't
+ be used now but might be if it's seen later in the compilation, and
+ 2 if this file could never be used in the compilation. */
int
c_common_valid_pch (cpp_reader *pfile, const char *name, int fd)
{
int sizeread;
int result;
- char ident[IDENT_LENGTH];
- char short_strings[256 * 3];
- int strings_length;
+ char ident[IDENT_LENGTH + 16];
const char *pch_ident;
struct c_pch_validity v;
/* Perform a quick test of whether this is a valid
precompiled header for the current language. */
- sizeread = read (fd, ident, IDENT_LENGTH);
+ gcc_assert (memcmp (executable_checksum, no_checksum, 16) != 0);
+
+ sizeread = read (fd, ident, IDENT_LENGTH + 16);
if (sizeread == -1)
- fatal_error ("can't read %s: %m", name);
- else if (sizeread != IDENT_LENGTH)
- return 2;
-
+ fatal_error ("can%'t read %s: %m", name);
+ else if (sizeread != IDENT_LENGTH + 16)
+ {
+ if (cpp_get_options (pfile)->warn_invalid_pch)
+ cpp_error (pfile, CPP_DL_WARNING, "%s: too short to be a PCH file",
+ name);
+ return 2;
+ }
+
pch_ident = get_ident();
if (memcmp (ident, pch_ident, IDENT_LENGTH) != 0)
{
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,
+ cpp_error (pfile, CPP_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 %s", name,
+ cpp_error (pfile, CPP_DL_WARNING, "%s: not for %s", name,
lang_hooks.name);
- else
+ else
/* Not any kind of PCH. */
- cpp_error (pfile, DL_WARNING, "%s: not a PCH file", name);
+ cpp_error (pfile, CPP_DL_WARNING, "%s: not a PCH file", name);
}
return 2;
}
-
- /* At this point, we know it's a PCH file, so it ought to be long enough
- that we can read a c_pch_validity structure. */
- if (read (fd, &v, sizeof (v)) != sizeof (v))
- fatal_error ("can't read %s: %m", name);
-
- strings_length = (v.host_machine_length + v.target_machine_length
- + v.version_length);
- if (read (fd, short_strings, strings_length) != strings_length)
- fatal_error ("can't read %s: %m", name);
- if (v.host_machine_length != strlen (host_machine)
- || memcmp (host_machine, short_strings, strlen (host_machine)) != 0)
- {
- if (cpp_get_options (pfile)->warn_invalid_pch)
- cpp_error (pfile, DL_WARNING,
- "%s: created on host `%.*s', but used on host `%s'", name,
- v.host_machine_length, short_strings, host_machine);
- return 2;
- }
- if (v.target_machine_length != strlen (target_machine)
- || memcmp (target_machine, short_strings + v.host_machine_length,
- strlen (target_machine)) != 0)
- {
- if (cpp_get_options (pfile)->warn_invalid_pch)
- cpp_error (pfile, DL_WARNING,
- "%s: created for target `%.*s', but used for target `%s'",
- name, v.target_machine_length,
- short_strings + v.host_machine_length, target_machine);
- return 2;
- }
- if (v.version_length != strlen (version_string)
- || memcmp (version_string,
- (short_strings + v.host_machine_length
- + v.target_machine_length),
- v.version_length) != 0)
+ if (memcmp (ident + IDENT_LENGTH, executable_checksum, 16) != 0)
{
if (cpp_get_options (pfile)->warn_invalid_pch)
- cpp_error (pfile, DL_WARNING,
- "%s: created by version `%.*s', but this is version `%s'",
- name, v.version_length,
- (short_strings + v.host_machine_length
- + v.target_machine_length),
- version_string);
+ cpp_error (pfile, CPP_DL_WARNING,
+ "%s: created by a different GCC executable", name);
return 2;
}
+ /* At this point, we know it's a PCH file created by this
+ executable, so it ought to be long enough that we can read a
+ c_pch_validity structure. */
+ if (read (fd, &v, sizeof (v)) != sizeof (v))
+ fatal_error ("can%'t read %s: %m", name);
+
/* The allowable debug info combinations are that either the PCH file
was built with the same as is being used now, or the PCH file was
built for some kind of debug info but now none is in use. */
&& write_symbols != NO_DEBUG)
{
if (cpp_get_options (pfile)->warn_invalid_pch)
- cpp_error (pfile, DL_WARNING,
+ cpp_error (pfile, CPP_DL_WARNING,
"%s: created with -g%s, but used with -g%s", name,
debug_type_names[v.debug_info_type],
debug_type_names[write_symbols]);
return 2;
}
+ /* Check flags that must match exactly. */
+ {
+ size_t i;
+ for (i = 0; i < MATCH_SIZE; i++)
+ if (*pch_matching[i].flag_var != v.match[i])
+ {
+ if (cpp_get_options (pfile)->warn_invalid_pch)
+ cpp_error (pfile, CPP_DL_WARNING,
+ "%s: settings for %s do not match", name,
+ pch_matching[i].flag_name);
+ return 2;
+ }
+ }
+
/* If the text segment was not loaded at the same address as it was
when the PCH file was created, function pointers loaded from the
PCH will not be valid. We could in theory remap all the function
- pointers, but no support for that exists at present. */
+ pointers, but no support for that exists at present.
+ Since we have the same executable, it should only be necessary to
+ check one function. */
if (v.pch_init != &pch_init)
{
if (cpp_get_options (pfile)->warn_invalid_pch)
- cpp_error (pfile, DL_WARNING,
+ cpp_error (pfile, CPP_DL_WARNING,
"%s: had text segment at different address", name);
return 2;
}
+ /* Check the target-specific validity data. */
+ {
+ void *this_file_data = xmalloc (v.target_data_length);
+ const char *msg;
+
+ if ((size_t) read (fd, this_file_data, v.target_data_length)
+ != v.target_data_length)
+ fatal_error ("can%'t read %s: %m", name);
+ msg = targetm.pch_valid_p (this_file_data, v.target_data_length);
+ free (this_file_data);
+ if (msg != NULL)
+ {
+ if (cpp_get_options (pfile)->warn_invalid_pch)
+ cpp_error (pfile, CPP_DL_WARNING, "%s: %s", name, msg);
+ 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;
return result == 0;
}
+/* If non-NULL, this function is called after a precompile header file
+ is loaded. */
+void (*lang_post_pch_load) (void);
+
/* Load in the PCH file NAME, open on FD. It was originally searched for
by ORIG_NAME. */
{
FILE *f;
struct c_pch_header h;
- char *buf;
- unsigned long written;
struct save_macro_data *smd;
-
+ expanded_location saved_loc;
+ bool saved_trace_includes;
+
+ timevar_push (TV_PCH_RESTORE);
+
f = fdopen (fd, "rb");
if (f == NULL)
{
- cpp_errno (pfile, DL_ERROR, "calling fdopen");
- return;
+ cpp_errno (pfile, CPP_DL_ERROR, "calling fdopen");
+ close (fd);
+ goto end;
}
cpp_get_callbacks (parse_in)->valid_pch = NULL;
if (fread (&h, sizeof (h), 1, f) != 1)
{
- cpp_errno (pfile, DL_ERROR, "reading");
- return;
+ cpp_errno (pfile, CPP_DL_ERROR, "reading");
+ fclose (f);
+ goto end;
}
- buf = xmalloc (16384);
- for (written = 0; written < h.asm_size; )
+ if (!flag_preprocess_only)
{
- long 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;
+ unsigned long written;
+ char * buf = XNEWVEC (char, 16384);
+
+ for (written = 0; written < h.asm_size; )
+ {
+ long 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, CPP_DL_ERROR, "reading");
+ written += size;
+ }
+ free (buf);
}
- free (buf);
+ else
+ {
+ /* If we're preprocessing, don't write to a NULL
+ asm_out_file. */
+ if (fseek (f, h.asm_size, SEEK_CUR) != 0)
+ cpp_errno (pfile, CPP_DL_ERROR, "seeking");
+ }
+
+ /* Save the location and then restore it after reading the PCH. */
+ saved_loc = expand_location (line_table->highest_line);
+ saved_trace_includes = line_table->trace_includes;
+ timevar_push (TV_PCH_CPP_RESTORE);
cpp_prepare_state (pfile, &smd);
+ timevar_pop (TV_PCH_CPP_RESTORE);
gt_pch_restore (f);
+ timevar_push (TV_PCH_CPP_RESTORE);
if (cpp_read_state (pfile, name, f, smd) != 0)
- return;
+ {
+ fclose (f);
+ timevar_pop (TV_PCH_CPP_RESTORE);
+ goto end;
+ }
+ timevar_pop (TV_PCH_CPP_RESTORE);
+
fclose (f);
+
+ line_table->trace_includes = saved_trace_includes;
+ cpp_set_line_map (pfile, line_table);
+ linemap_add (line_table, LC_RENAME, 0, saved_loc.file, saved_loc.line);
+
+ /* Give the front end a chance to take action after a PCH file has
+ been loaded. */
+ if (lang_post_pch_load)
+ (*lang_post_pch_load) ();
+
+end:
+ timevar_pop (TV_PCH_RESTORE);
}
/* Indicate that no more PCH files should be read. */
if (cpp_get_callbacks (parse_in)->valid_pch)
{
cpp_get_callbacks (parse_in)->valid_pch = NULL;
- host_hooks.gt_pch_use_address (NULL, 0);
+ host_hooks.gt_pch_use_address (NULL, 0, -1, 0);
+ }
+}
+
+/* Handle #pragma GCC pch_preprocess, to load in the PCH file. */
+
+#ifndef O_BINARY
+# define O_BINARY 0
+#endif
+
+void
+c_common_pch_pragma (cpp_reader *pfile, const char *name)
+{
+ int fd;
+
+ if (!cpp_get_options (pfile)->preprocessed)
+ {
+ error ("pch_preprocess pragma should only be used with -fpreprocessed");
+ inform (input_location, "use #include instead");
+ return;
+ }
+
+ fd = open (name, O_RDONLY | O_BINARY, 0666);
+ if (fd == -1)
+ fatal_error ("%s: couldn%'t open PCH file: %m", name);
+
+ if (c_common_valid_pch (pfile, name, fd) != 1)
+ {
+ if (!cpp_get_options (pfile)->warn_invalid_pch)
+ inform (input_location, "use -Winvalid-pch for more information");
+ fatal_error ("%s: PCH file was invalid", name);
}
+
+ c_common_read_pch (pfile, name, fd, name);
+
+ close (fd);
+}
+
+/* Print out executable_checksum[]. */
+
+void
+c_common_print_pch_checksum (FILE *f)
+{
+ int i;
+ fputs ("Compiler executable checksum: ", f);
+ for (i = 0; i < 16; i++)
+ fprintf (f, "%02x", executable_checksum[i]);
+ putc ('\n', f);
}
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