#include "config.h"
#include "system.h"
#include "coretypes.h"
+#include "version.h"
#include "cpplib.h"
#include "tree.h"
#include "flags.h"
#include "ggc.h"
#include "langhooks.h"
#include "hosthooks.h"
+#include "target.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.
+
+ If you add or change entries before version_length, you should increase
+ 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 host_machine_length;
+ unsigned char target_machine_length;
+ unsigned char version_length;
unsigned char debug_info_type;
+ void (*pch_init) (void);
+ size_t target_data_length;
};
struct c_pch_header
#define IDENT_LENGTH 8
+/* The file we'll be writing the PCH to. */
static FILE *pch_outfile;
+/* 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
get_ident(void)
{
static char result[IDENT_LENGTH];
- static const char template[IDENT_LENGTH] = "gpch.011";
+ static const char template[IDENT_LENGTH] = "gpch.012";
static const char c_language_chars[] = "Co+O";
memcpy (result, template, IDENT_LENGTH);
{
FILE *f;
struct c_pch_validity v;
+ void *target_validity;
+ static const char partial_pch[IDENT_LENGTH] = "gpcWrite";
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);
v.debug_info_type = write_symbols;
- if (fwrite (get_ident(), IDENT_LENGTH, 1, f) != 1
- || fwrite (&v, sizeof (v), 1, f) != 1)
+ 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
+ || 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. */
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)
int sizeread;
int result;
char ident[IDENT_LENGTH];
+ char short_strings[256 * 3];
+ int strings_length;
const char *pch_ident;
struct c_pch_validity v;
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);
+ 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, CPP_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, 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;
+ }
+ 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 (cpp_get_options (pfile)->warn_invalid_pch)
+ 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),
+ version_string);
+ return 2;
+ }
+
/* 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;
}
+ /* 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. */
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;
}
size = 16384;
if (fread (buf, size, 1, f) != 1
|| fwrite (buf, size, 1, asm_out_file) != 1)
- cpp_errno (pfile, DL_ERROR, "reading");
+ cpp_errno (pfile, CPP_DL_ERROR, "reading");
written += size;
}
free (buf);
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