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/* Java(TM) language-specific gimplification routines.
Copyright (C) 2003, 2004, 2006, 2007, 2007, 2008
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 3, 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 COPYING3. If not see
<http://www.gnu.org/licenses/>.
Java and all Java-based marks are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries.
The Free Software Foundation is independent of Sun Microsystems, Inc. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "java-tree.h"
#include "tree-dump.h"
#include "gimple.h"
static tree java_gimplify_block (tree);
static enum gimplify_status java_gimplify_modify_expr (tree *);
static enum gimplify_status java_gimplify_self_mod_expr (tree *, gimple_seq *,
gimple_seq *);
static void dump_java_tree (enum tree_dump_index, tree);
/* Convert a Java tree to GENERIC. */
void
java_genericize (tree fndecl)
{
walk_tree (&DECL_SAVED_TREE (fndecl), java_replace_references, NULL, NULL);
dump_java_tree (TDI_original, fndecl);
}
/* Gimplify a Java tree. */
int
java_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
{
enum tree_code code = TREE_CODE (*expr_p);
switch (code)
{
case BLOCK:
*expr_p = java_gimplify_block (*expr_p);
break;
case MODIFY_EXPR:
return java_gimplify_modify_expr (expr_p);
case POSTINCREMENT_EXPR:
case POSTDECREMENT_EXPR:
case PREINCREMENT_EXPR:
case PREDECREMENT_EXPR:
return java_gimplify_self_mod_expr (expr_p, pre_p, post_p);
/* These should already be lowered before we get here. */
case URSHIFT_EXPR:
case COMPARE_EXPR:
case COMPARE_L_EXPR:
case COMPARE_G_EXPR:
gcc_unreachable ();
default:
return GS_UNHANDLED;
}
return GS_OK;
}
static enum gimplify_status
java_gimplify_modify_expr (tree *modify_expr_p)
{
tree modify_expr = *modify_expr_p;
tree lhs = TREE_OPERAND (modify_expr, 0);
tree rhs = TREE_OPERAND (modify_expr, 1);
tree lhs_type = TREE_TYPE (lhs);
if (lhs_type != TREE_TYPE (rhs))
/* Fix up type mismatches to make legal GIMPLE. These are
generated in several places, in particular null pointer
assignment and subclass assignment. */
TREE_OPERAND (modify_expr, 1) = convert (lhs_type, rhs);
return GS_UNHANDLED;
}
/* Special case handling for volatiles: we need to generate a barrier
between the reading and the writing. */
static enum gimplify_status
java_gimplify_self_mod_expr (tree *expr_p, gimple_seq *pre_p ATTRIBUTE_UNUSED,
gimple_seq *post_p ATTRIBUTE_UNUSED)
{
tree lhs = TREE_OPERAND (*expr_p, 0);
if (TREE_CODE (lhs) == COMPONENT_REF
&& TREE_THIS_VOLATILE (TREE_OPERAND (lhs, 1)))
TREE_THIS_VOLATILE (lhs) = 1;
return GS_UNHANDLED;
}
/* Gimplify BLOCK into a BIND_EXPR. */
static tree
java_gimplify_block (tree java_block)
{
tree decls = BLOCK_VARS (java_block);
tree body = BLOCK_EXPR_BODY (java_block);
gimple outer = gimple_current_bind_expr ();
tree block;
/* Don't bother with empty blocks. */
if (! body)
return build_empty_stmt (input_location);
if (IS_EMPTY_STMT (body))
return body;
/* Make a proper block. Java blocks are unsuitable for BIND_EXPR
because they use BLOCK_SUBBLOCKS for another purpose. */
block = make_node (BLOCK);
BLOCK_VARS (block) = decls;
/* The TREE_USED flag on a block determines whether the debug output
routines generate info for the variables in that block. */
TREE_USED (block) = 1;
if (outer != NULL)
{
tree b = gimple_bind_block (outer);
BLOCK_SUBBLOCKS (b) = chainon (BLOCK_SUBBLOCKS (b), block);
}
BLOCK_EXPR_BODY (java_block) = NULL_TREE;
return build3 (BIND_EXPR, TREE_TYPE (java_block), decls, body, block);
}
/* Dump a tree of some kind. This is a convenience wrapper for the
dump_* functions in tree-dump.c. */
static void
dump_java_tree (enum tree_dump_index phase, tree t)
{
FILE *stream;
int flags;
stream = dump_begin (phase, &flags);
flags |= TDF_SLIM;
if (stream)
{
dump_node (t, flags, stream);
dump_end (phase, stream);
}
}
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