/* 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 "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
for a different operating system. Thus, it should really only contain
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;
};
if (f == NULL)
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;
+ {
+ 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);
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);
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);
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
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");
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, CPP_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. */
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);
+}
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