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/* C++-specific tree lowering bits; see also c-simplify.c and tree-simple.c.
Copyright (C) 2002, 2003 Free Software Foundation, Inc.
Contributed by Jason Merrill <jason@redhat.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. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "cp-tree.h"
#include "c-common.h"
#include "toplev.h"
#include "tree-simple.h"
static void genericize_try_block (tree *);
static void genericize_catch_block (tree *);
static void genericize_eh_spec_block (tree *);
static void gimplify_must_not_throw_expr (tree *, tree *);
static void cp_gimplify_init_expr (tree *, tree *, tree *);
/* Genericize a C++ _STMT. Called from c_gimplify_stmt. */
int
cp_gimplify_stmt (tree *stmt_p, tree *next_p ATTRIBUTE_UNUSED)
{
tree stmt = *stmt_p;
switch (TREE_CODE (stmt))
{
case TRY_BLOCK:
genericize_try_block (stmt_p);
return 1;
case HANDLER:
genericize_catch_block (stmt_p);
return 1;
case EH_SPEC_BLOCK:
genericize_eh_spec_block (stmt_p);
return 1;
case USING_STMT:
/* Just ignore for now. Eventually we will want to pass this on to
the debugger. */
*stmt_p = build_empty_stmt ();
return 1;
default:
break;
}
return 0;
}
/* Genericize a TRY_BLOCK. */
static void
genericize_try_block (tree *stmt_p)
{
tree body = TRY_STMTS (*stmt_p);
tree cleanup = TRY_HANDLERS (*stmt_p);
c_gimplify_stmt (&body);
if (CLEANUP_P (*stmt_p))
/* A cleanup is an expression, so it doesn't need to be genericized. */;
else
c_gimplify_stmt (&cleanup);
*stmt_p = build (TRY_CATCH_EXPR, void_type_node, body, cleanup);
}
/* Genericize a HANDLER by converting to a CATCH_EXPR. */
static void
genericize_catch_block (tree *stmt_p)
{
tree type = HANDLER_TYPE (*stmt_p);
tree body = HANDLER_BODY (*stmt_p);
c_gimplify_stmt (&body);
/* FIXME should the caught type go in TREE_TYPE? */
*stmt_p = build (CATCH_EXPR, void_type_node, type, body);
}
/* Genericize an EH_SPEC_BLOCK by converting it to a
TRY_CATCH_EXPR/EH_FILTER_EXPR pair. */
static void
genericize_eh_spec_block (tree *stmt_p)
{
tree body = EH_SPEC_STMTS (*stmt_p);
tree allowed = EH_SPEC_RAISES (*stmt_p);
tree failure = build_call (call_unexpected_node,
tree_cons (NULL_TREE, build_exc_ptr (),
NULL_TREE));
c_gimplify_stmt (&body);
*stmt_p = gimple_build_eh_filter (body, allowed, failure);
}
/* Do C++-specific gimplification. Args are as for gimplify_expr. */
int
cp_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p)
{
switch (TREE_CODE (*expr_p))
{
case PTRMEM_CST:
*expr_p = cplus_expand_constant (*expr_p);
return GS_OK;
case AGGR_INIT_EXPR:
simplify_aggr_init_expr (expr_p);
return GS_OK;
case THROW_EXPR:
/* FIXME communicate throw type to backend, probably by moving
THROW_EXPR into ../tree.def. */
*expr_p = TREE_OPERAND (*expr_p, 0);
return GS_OK;
case MUST_NOT_THROW_EXPR:
gimplify_must_not_throw_expr (expr_p, pre_p);
return GS_OK;
case INIT_EXPR:
case MODIFY_EXPR:
cp_gimplify_init_expr (expr_p, pre_p, post_p);
return GS_OK;
case EMPTY_CLASS_EXPR:
{
/* Yes, an INTEGER_CST with RECORD_TYPE. */
tree i = build_int_2 (0, 0);
TREE_TYPE (i) = TREE_TYPE (*expr_p);
*expr_p = i;
}
return GS_OK;
case BASELINK:
*expr_p = BASELINK_FUNCTIONS (*expr_p);
return GS_OK;
default:
return c_gimplify_expr (expr_p, pre_p, post_p);
}
}
/* Gimplify initialization from an AGGR_INIT_EXPR. */
static void
cp_gimplify_init_expr (tree *expr_p, tree *pre_p, tree *post_p)
{
tree from = TREE_OPERAND (*expr_p, 1);
tree to = TREE_OPERAND (*expr_p, 0);
tree sub;
/* If we are initializing something from a TARGET_EXPR, strip the
TARGET_EXPR and initialize it directly. */
/* What about code that pulls out the temp and uses it elsewhere? I
think that such code never uses the TARGET_EXPR as an initializer. If
I'm wrong, we'll abort because the temp won't have any RTL. In that
case, I guess we'll need to replace references somehow. */
if (TREE_CODE (from) == TARGET_EXPR)
from = TARGET_EXPR_INITIAL (from);
sub = from;
/* If we are initializing from a STMT_EXPR, extract the returned
expression. */
if (TREE_CODE (from) == STMT_EXPR)
sub = EXPR_STMT_EXPR (stmt_expr_last_stmt (from));
/* Look through any COMPOUND_EXPRs. */
while (TREE_CODE (sub) == COMPOUND_EXPR)
sub = TREE_OPERAND (sub, 1);
/* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
replace the slot operand with our target.
Should we add a target parm to gimplify_expr instead? No, as in this
case we want to replace the INIT_EXPR. */
if (TREE_CODE (sub) == AGGR_INIT_EXPR)
{
gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
TREE_OPERAND (sub, 2) = to;
*expr_p = from;
/* The initialization is now a side-effect, so the container can
become void. This is important for a STMT_EXPR, so we don't try
to voidify it later by creating a temporary. */
if (from != sub)
TREE_TYPE (from) = void_type_node;
}
}
/* Gimplify a MUST_NOT_THROW_EXPR. */
static void
gimplify_must_not_throw_expr (tree *expr_p, tree *pre_p)
{
tree stmt = *expr_p;
tree temp = voidify_wrapper_expr (stmt);
tree body = TREE_OPERAND (stmt, 0);
gimplify_stmt (&body);
stmt = gimple_build_eh_filter (body, NULL_TREE,
build_call (terminate_node, NULL_TREE));
if (temp)
{
append_to_statement_list (stmt, pre_p);
*expr_p = temp;
}
else
*expr_p = stmt;
}
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