/* Language-specific hook definitions for C front end.
   Copyright (C) 1991, 1995, 1997, 1998,
   1999, 2000, 2001 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) 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.  */


#include "config.h"
#include "system.h"
#include "tree.h"
#include "function.h"
#include "toplev.h"
#include "flags.h"
#include "ggc.h"
#include "rtl.h"
#include "expr.h"
#include "c-tree.h"
#include "varray.h"
#include "langhooks.h"
#include "langhooks-def.h"

static const char *c_init PARAMS ((const char *));
static void c_init_options PARAMS ((void));
static void c_post_options PARAMS ((void));

/* ### When changing hooks, consider if ObjC needs changing too!! ### */

#undef LANG_HOOKS_NAME
#define LANG_HOOKS_NAME "GNU C"
#undef LANG_HOOKS_INIT
#define LANG_HOOKS_INIT c_init
#undef LANG_HOOKS_FINISH
#define LANG_HOOKS_FINISH c_common_finish
#undef LANG_HOOKS_INIT_OPTIONS
#define LANG_HOOKS_INIT_OPTIONS c_init_options
#undef LANG_HOOKS_DECODE_OPTION
#define LANG_HOOKS_DECODE_OPTION c_decode_option
#undef LANG_HOOKS_POST_OPTIONS
#define LANG_HOOKS_POST_OPTIONS c_post_options
#undef LANG_HOOKS_GET_ALIAS_SET
#define LANG_HOOKS_GET_ALIAS_SET c_common_get_alias_set
#undef LANG_HOOKS_SAFE_FROM_P
#define LANG_HOOKS_SAFE_FROM_P c_safe_from_p
#undef LANG_HOOKS_STATICP
#define LANG_HOOKS_STATICP c_staticp
#undef LANG_HOOKS_PRINT_IDENTIFIER
#define LANG_HOOKS_PRINT_IDENTIFIER c_print_identifier
#undef LANG_HOOKS_SET_YYDEBUG
#define LANG_HOOKS_SET_YYDEBUG c_set_yydebug

#undef LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN
#define LANG_HOOKS_TREE_INLINING_CANNOT_INLINE_TREE_FN \
  c_cannot_inline_tree_fn
#undef LANG_HOOKS_TREE_INLINING_DISREGARD_INLINE_LIMITS
#define LANG_HOOKS_TREE_INLINING_DISREGARD_INLINE_LIMITS \
  c_disregard_inline_limits
#undef LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P
#define LANG_HOOKS_TREE_INLINING_ANON_AGGR_TYPE_P \
  anon_aggr_type_p

/* ### When changing hooks, consider if ObjC needs changing too!! ### */

/* Each front end provides its own.  */
const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

static varray_type deferred_fns;

/* Post-switch processing.  */
static void
c_post_options ()
{
  c_common_post_options ();
}

static void
c_init_options ()
{
  c_common_init_options (clk_c);
}

static const char *
c_init (filename)
     const char *filename;
{
  filename = c_objc_common_init (filename);

  VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
  ggc_add_tree_varray_root (&deferred_fns, 1);

  return filename;
}

/* Used by c-lex.c, but only for objc.  */

tree
lookup_interface (arg)
     tree arg ATTRIBUTE_UNUSED;
{
  return 0;
}

tree
is_class_name (arg)
    tree arg ATTRIBUTE_UNUSED;
{
  return 0;
}

void
maybe_objc_check_decl (decl)
     tree decl ATTRIBUTE_UNUSED;
{
}

int
maybe_objc_comptypes (lhs, rhs, reflexive)
     tree lhs ATTRIBUTE_UNUSED;
     tree rhs ATTRIBUTE_UNUSED;
     int reflexive ATTRIBUTE_UNUSED;
{
  return -1;
}

tree
maybe_building_objc_message_expr ()
{
  return 0;
}

int
recognize_objc_keyword ()
{
  return 0;
}

/* Used by c-typeck.c (build_external_ref), but only for objc.  */

tree
lookup_objc_ivar (id)
     tree id ATTRIBUTE_UNUSED;
{
  return 0;
}

extern tree static_ctors;
extern tree static_dtors;

static tree start_cdtor		PARAMS ((int));
static void finish_cdtor	PARAMS ((tree));

static tree
start_cdtor (method_type)
     int method_type;
{
  tree fnname = get_file_function_name (method_type);
  tree void_list_node_1 = build_tree_list (NULL_TREE, void_type_node);
  tree body;

  start_function (void_list_node_1,
		  build_nt (CALL_EXPR, fnname,
			    tree_cons (NULL_TREE, NULL_TREE, void_list_node_1),
			    NULL_TREE),
		  NULL_TREE);
  store_parm_decls ();

  current_function_cannot_inline
    = "static constructors and destructors cannot be inlined";

  body = c_begin_compound_stmt ();

  pushlevel (0);
  clear_last_expr ();
  add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);

  return body;
}

static void
finish_cdtor (body)
     tree body;
{
  tree scope;
  tree block;

  scope = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0);
  block = poplevel (0, 0, 0);
  SCOPE_STMT_BLOCK (TREE_PURPOSE (scope)) = block;
  SCOPE_STMT_BLOCK (TREE_VALUE (scope)) = block;

  RECHAIN_STMTS (body, COMPOUND_BODY (body));

  finish_function (0);
}

/* Register a function tree, so that its optimization and conversion
   to RTL is only done at the end of the compilation.  */

int
defer_fn (fn)
     tree fn;
{
  VARRAY_PUSH_TREE (deferred_fns, fn);

  return 1;
}

/* Called at end of parsing, but before end-of-file processing.  */

void
finish_file ()
{
  unsigned int i;

  for (i = 0; i < VARRAY_ACTIVE_SIZE (deferred_fns); i++)
    {
      tree decl = VARRAY_TREE (deferred_fns, i);

      if (! TREE_ASM_WRITTEN (decl))
	{
	  /* For static inline functions, delay the decision whether to
	     emit them or not until wrapup_global_declarations.  */
	  if (! TREE_PUBLIC (decl))
	    DECL_DEFER_OUTPUT (decl) = 1;
	  c_expand_deferred_function (decl);
	}
    }
  VARRAY_FREE (deferred_fns);

  if (static_ctors)
    {
      tree body = start_cdtor ('I');

      for (; static_ctors; static_ctors = TREE_CHAIN (static_ctors))
	c_expand_expr_stmt (build_function_call (TREE_VALUE (static_ctors),
						 NULL_TREE));

      finish_cdtor (body);
    }
  if (static_dtors)
    {
      tree body = start_cdtor ('D');

      for (; static_dtors; static_dtors = TREE_CHAIN (static_dtors))
	c_expand_expr_stmt (build_function_call (TREE_VALUE (static_dtors),
						 NULL_TREE));

      finish_cdtor (body);
    }

  if (back_end_hook)
    (*back_end_hook) (getdecls ());
  
  {
    int flags;
    FILE *stream = dump_begin (TDI_all, &flags);

    if (stream)
      {
	dump_node (getdecls (), flags & ~TDF_SLIM, stream);
	dump_end (TDI_all, stream);
      }
  }
}