/* Precompiled header implementation for the C languages.
- Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GCC.
#include "ggc.h"
#include "langhooks.h"
#include "hosthooks.h"
+#include "target.h"
+
+/* 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'. */
+
+static const struct c_pch_matching
+{
+ int *flag_var;
+ const char *flag_name;
+} pch_matching[] = {
+ { &flag_exceptions, "-fexceptions" },
+ { &flag_unit_at_a_time, "-funit-at-a-time" }
+};
+
+enum {
+ MATCH_SIZE = ARRAY_SIZE (pch_matching)
+};
/* This structure is read very early when validating the PCH, and
might be read for a PCH which is for a completely different compiler
'unsigned char' entries, at least in the initial entries.
If you add or change entries before version_length, you should increase
- the version number in get_ident(). */
+ the version number in get_ident().
+
+ There are a bunch of fields named *_length; those are lengths of data that
+ follows this structure in the same order as the fields in the structure. */
struct c_pch_validity
{
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
format. */
static const char *
-get_ident(void)
+get_ident (void)
{
static char result[IDENT_LENGTH];
static const char template[IDENT_LENGTH] = "gpch.012";
{
FILE *f;
struct c_pch_validity v;
+ void *target_validity;
+ static const char partial_pch[IDENT_LENGTH] = "gpcWrite";
- if (! pch_file)
+ 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 ();
+
+ gcc_assert (strlen (host_machine) < 256
+ && strlen (target_machine) < 256
+ && strlen (version_string) < 256);
v.host_machine_length = strlen (host_machine);
v.target_machine_length = strlen (target_machine);
v.version_length = strlen (version_string);
-
v.debug_info_type = write_symbols;
- if (fwrite (get_ident(), IDENT_LENGTH, 1, f) != 1
+ {
+ 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;
+ target_validity = targetm.get_pch_validity (&v.target_data_length);
+
+ if (fwrite (partial_pch, IDENT_LENGTH, 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 (version_string, v.version_length, 1, f) != 1
+ || 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);
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);
+ fatal_error ("can%'t write %s: %m", pch_file);
buf = xmalloc (16384);
- fflush (asm_out_file);
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);
cpp_write_pch_state (parse_in, pch_outfile);
+ 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);
}
-/* 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)
sizeread = read (fd, ident, IDENT_LENGTH);
if (sizeread == -1)
- fatal_error ("can't read %s: %m", name);
+ fatal_error ("can%'t read %s: %m", name);
else if (sizeread != IDENT_LENGTH)
return 2;
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
/* 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);
+ 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);
+ 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,
+ cpp_error (pfile, CPP_DL_WARNING,
+ "%s: created on host '%.*s', but used on host '%s'", name,
v.host_machine_length, short_strings, host_machine);
return 2;
}
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'",
+ cpp_error (pfile, CPP_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;
v.version_length) != 0)
{
if (cpp_get_options (pfile)->warn_invalid_pch)
- cpp_error (pfile, DL_WARNING,
- "%s: created by version `%.*s', but this is version `%s'",
+ cpp_error (pfile, CPP_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),
&& 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. */
+ if (v.pch_init != &pch_init)
+ {
+ if (cpp_get_options (pfile)->warn_invalid_pch)
+ 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. */
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;
f = fdopen (fd, "rb");
if (f == NULL)
{
- cpp_errno (pfile, DL_ERROR, "calling fdopen");
+ cpp_errno (pfile, CPP_DL_ERROR, "calling fdopen");
return;
}
if (fread (&h, sizeof (h), 1, f) != 1)
{
- cpp_errno (pfile, DL_ERROR, "reading");
+ cpp_errno (pfile, CPP_DL_ERROR, "reading");
return;
}
- 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 = xmalloc (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);
+ }
+ 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");
}
- free (buf);
cpp_prepare_state (pfile, &smd);
return;
fclose (f);
+
+ /* 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) ();
}
/* 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)
+{
+ tree name_t;
+ const char *name;
+ int fd;
+
+ if (c_lex (&name_t) != CPP_STRING)
+ {
+ error ("malformed #pragma GCC pch_preprocess, ignored");
+ return;
+ }
+
+ if (!cpp_get_options (pfile)->preprocessed)
+ {
+ error ("pch_preprocess pragma should only be used with -fpreprocessed");
+ inform ("use #include instead");
+ return;
}
+
+ name = TREE_STRING_POINTER (name_t);
+
+ fd = open (name, O_RDONLY | O_BINARY, 0666);
+ if (fd == -1)
+ fatal_error ("%s: couldn%'t open PCH file: %m\n", name);
+
+ if (c_common_valid_pch (pfile, name, fd) != 1)
+ {
+ if (!cpp_get_options (pfile)->warn_invalid_pch)
+ inform ("use -Winvalid-pch for more information");
+ fatal_error ("%s: PCH file was invalid", name);
+ }
+
+ c_common_read_pch (pfile, name, fd, name);
+
+ close (fd);
}