freebsd-dev/contrib/gcc/cp/repo.c
2004-07-28 03:11:36 +00:00

443 lines
9.3 KiB
C

/* Code to maintain a C++ template repository.
Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003
Free Software Foundation, Inc.
Contributed by Jason Merrill (jason@cygnus.com)
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)
any later version.
GCC 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 GCC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* My strategy here is as follows:
Everything should be emitted in a translation unit where it is used.
The results of the automatic process should be easily reproducible with
explicit code. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "cp-tree.h"
#include "input.h"
#include "obstack.h"
#include "toplev.h"
#include "diagnostic.h"
static tree repo_get_id (tree);
static char *extract_string (char **);
static const char *get_base_filename (const char *);
static void open_repo_file (const char *);
static char *afgets (FILE *);
static void reopen_repo_file_for_write (void);
static GTY(()) tree pending_repo;
static GTY(()) tree original_repo;
static char *repo_name;
static FILE *repo_file;
static const char *old_args, *old_dir, *old_main;
static struct obstack temporary_obstack;
#define IDENTIFIER_REPO_USED(NODE) (TREE_LANG_FLAG_3 (NODE))
#define IDENTIFIER_REPO_CHOSEN(NODE) (TREE_LANG_FLAG_4 (NODE))
#if 0
/* Record the flags used to compile this translation unit. */
void
repo_compile_flags (int argc, char **argv)
{
}
/* If this template has not been seen before, add a note to the repository
saying where the declaration was. This may be used to find the
definition at link time. */
void
repo_template_declared (tree t)
{}
/* Note where the definition of a template lives so that instantiations can
be generated later. */
void
repo_template_defined (tree t)
{}
/* Note where the definition of a class lives to that template
instantiations can use it. */
void
repo_class_defined (tree t)
{}
#endif
static tree
repo_get_id (tree t)
{
if (TYPE_P (t))
{
tree vtable;
/* If we're not done setting up the class, we may not have set up
the vtable, so going ahead would give the wrong answer.
See g++.pt/instantiate4.C. */
if (!COMPLETE_TYPE_P (t) || TYPE_BEING_DEFINED (t))
abort ();
vtable = get_vtbl_decl_for_binfo (TYPE_BINFO (t));
t = vtable;
if (t == NULL_TREE)
return t;
}
return DECL_ASSEMBLER_NAME (t);
}
/* Note that a template has been used. If we can see the definition, offer
to emit it. */
void
repo_template_used (tree t)
{
tree id;
if (! flag_use_repository)
return;
id = repo_get_id (t);
if (id == NULL_TREE)
return;
if (TYPE_P (t))
{
if (IDENTIFIER_REPO_CHOSEN (id))
mark_class_instantiated (t, 0);
}
else if (DECL_P (t))
{
if (IDENTIFIER_REPO_CHOSEN (id))
/* It doesn't make sense to instantiate a clone, so we
instantiate the cloned function instead. Note that this
approach will not work correctly if collect2 assigns
different clones to different files -- but it shouldn't. */
mark_decl_instantiated (DECL_CLONED_FUNCTION_P (t)
? DECL_CLONED_FUNCTION (t) : t,
0);
}
else
abort ();
if (! IDENTIFIER_REPO_USED (id))
{
IDENTIFIER_REPO_USED (id) = 1;
pending_repo = tree_cons (NULL_TREE, id, pending_repo);
}
}
#if 0
/* Note that the vtable for a class has been used, and offer to emit it. */
static void
repo_vtable_used (tree t)
{
if (! flag_use_repository)
return;
pending_repo = tree_cons (NULL_TREE, t, pending_repo);
}
/* Note that an inline with external linkage has been used, and offer to
emit it. */
void
repo_inline_used (tree fn)
{
if (! flag_use_repository)
return;
/* Member functions of polymorphic classes go with their vtables. */
if (DECL_FUNCTION_MEMBER_P (fn)
&& TYPE_POLYMORPHIC_P (DECL_CONTEXT (fn)))
{
repo_vtable_used (DECL_CONTEXT (fn));
return;
}
pending_repo = tree_cons (NULL_TREE, fn, pending_repo);
}
/* Note that a particular typeinfo node has been used, and offer to
emit it. */
void
repo_tinfo_used (tree ti)
{
}
#endif
void
repo_template_instantiated (tree t, bool extern_p)
{
if (! extern_p)
{
tree id = repo_get_id (t);
if (id)
IDENTIFIER_REPO_CHOSEN (id) = 1;
}
}
/* Parse a reasonable subset of shell quoting syntax. */
static char *
extract_string (char **pp)
{
char *p = *pp;
int backquote = 0;
int inside = 0;
for (;;)
{
char c = *p;
if (c == '\0')
break;
++p;
if (backquote)
obstack_1grow (&temporary_obstack, c);
else if (! inside && c == ' ')
break;
else if (! inside && c == '\\')
backquote = 1;
else if (c == '\'')
inside = !inside;
else
obstack_1grow (&temporary_obstack, c);
}
obstack_1grow (&temporary_obstack, '\0');
*pp = p;
return obstack_finish (&temporary_obstack);
}
static const char *
get_base_filename (const char *filename)
{
char *p = getenv ("COLLECT_GCC_OPTIONS");
char *output = NULL;
int compiling = 0;
while (p && *p)
{
char *q = extract_string (&p);
if (strcmp (q, "-o") == 0)
output = extract_string (&p);
else if (strcmp (q, "-c") == 0)
compiling = 1;
}
if (compiling && output)
return output;
if (p && ! compiling)
{
warning ("-frepo must be used with -c");
flag_use_repository = 0;
return NULL;
}
return lbasename (filename);
}
static void
open_repo_file (const char *filename)
{
const char *p;
const char *s = get_base_filename (filename);
if (s == NULL)
return;
p = lbasename (s);
p = strrchr (p, '.');
if (! p)
p = s + strlen (s);
repo_name = xmalloc (p - s + 5);
memcpy (repo_name, s, p - s);
memcpy (repo_name + (p - s), ".rpo", 5);
repo_file = fopen (repo_name, "r");
}
static char *
afgets (FILE *stream)
{
int c;
while ((c = getc (stream)) != EOF && c != '\n')
obstack_1grow (&temporary_obstack, c);
if (obstack_object_size (&temporary_obstack) == 0)
return NULL;
obstack_1grow (&temporary_obstack, '\0');
return obstack_finish (&temporary_obstack);
}
void
init_repo (const char *filename)
{
char *buf;
if (! flag_use_repository)
return;
gcc_obstack_init (&temporary_obstack);
open_repo_file (filename);
if (repo_file == 0)
return;
while ((buf = afgets (repo_file)))
{
switch (buf[0])
{
case 'A':
old_args = ggc_strdup (buf + 2);
break;
case 'D':
old_dir = ggc_strdup (buf + 2);
break;
case 'M':
old_main = ggc_strdup (buf + 2);
break;
case 'C':
case 'O':
{
tree id = get_identifier (buf + 2);
tree orig;
if (buf[0] == 'C')
{
IDENTIFIER_REPO_CHOSEN (id) = 1;
orig = integer_one_node;
}
else
orig = NULL_TREE;
original_repo = tree_cons (orig, id, original_repo);
}
break;
default:
error ("mysterious repository information in %s", repo_name);
}
obstack_free (&temporary_obstack, buf);
}
}
static void
reopen_repo_file_for_write (void)
{
if (repo_file)
fclose (repo_file);
repo_file = fopen (repo_name, "w");
if (repo_file == 0)
{
error ("can't create repository information file `%s'", repo_name);
flag_use_repository = 0;
}
}
/* Emit any pending repos. */
void
finish_repo (void)
{
tree t;
bool repo_changed = false;
char *dir, *args;
if (!flag_use_repository)
return;
/* Do we have to write out a new info file? */
/* Are there any old templates that aren't used any longer or that are
newly chosen? */
for (t = original_repo; t; t = TREE_CHAIN (t))
{
if (!IDENTIFIER_REPO_USED (TREE_VALUE (t))
|| (!TREE_PURPOSE (t) && IDENTIFIER_REPO_CHOSEN (TREE_VALUE (t))))
{
repo_changed = true;
break;
}
IDENTIFIER_REPO_USED (TREE_VALUE (t)) = 0;
}
/* Are there any templates that are newly used? */
if (!repo_changed)
for (t = pending_repo; t; t = TREE_CHAIN (t))
{
if (IDENTIFIER_REPO_USED (TREE_VALUE (t)))
{
repo_changed = true;
break;
}
}
dir = getpwd ();
args = getenv ("COLLECT_GCC_OPTIONS");
if (!repo_changed && pending_repo)
if (strcmp (old_main, main_input_filename) != 0
|| strcmp (old_dir, dir) != 0
|| (args == NULL) != (old_args == NULL)
|| (args && strcmp (old_args, args) != 0))
repo_changed = true;
if (!repo_changed || errorcount || sorrycount)
goto out;
reopen_repo_file_for_write ();
if (repo_file == 0)
goto out;
fprintf (repo_file, "M %s\n", main_input_filename);
fprintf (repo_file, "D %s\n", dir);
if (args)
fprintf (repo_file, "A %s\n", args);
for (t = pending_repo; t; t = TREE_CHAIN (t))
{
tree val = TREE_VALUE (t);
char type = IDENTIFIER_REPO_CHOSEN (val) ? 'C' : 'O';
fprintf (repo_file, "%c %s\n", type, IDENTIFIER_POINTER (val));
}
out:
if (repo_file)
fclose (repo_file);
}
#include "gt-cp-repo.h"