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	/*
	* Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.tools.tree;

	import sun.tools.java.*;
	import sun.tools.asm.Assembler;
	import java.util.Hashtable;

	/**
	* WARNING: The contents of this source file are not part of any
	* supported API. Code that depends on them does so at its own risk:
	* they are subject to change or removal without notice.
	*/
	public
	class CommaExpression extends BinaryExpression {
	/**
	* constructor
	*/
	public CommaExpression(long where, Expression left, Expression right) {
	super(COMMA, where, (right != null) ? right.type : Type.tVoid, left, right);
	}

	/**
	* Check void expression
	*/
	public Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
	vset = left.check(env, ctx, vset, exp);
	vset = right.check(env, ctx, vset, exp);
	return vset;
	}

	/**
	* Select the type
	*/
	void selectType(Environment env, Context ctx, int tm) {
	type = right.type;
	}

	/**
	* Simplify
	*/
	Expression simplify() {
	if (left == null) {
	return right;
	}
	if (right == null) {
	return left;
	}
	return this;
	}

	/**
	* Inline
	*/
	public Expression inline(Environment env, Context ctx) {
	if (left != null) {
	left = left.inline(env, ctx);
	}
	if (right != null) {
	right = right.inline(env, ctx);
	}
	return simplify();
	}
	public Expression inlineValue(Environment env, Context ctx) {
	if (left != null) {
	left = left.inline(env, ctx);
	}
	if (right != null) {
	right = right.inlineValue(env, ctx);
	}
	return simplify();
	}

	/**
	* Code
	*/
	int codeLValue(Environment env, Context ctx, Assembler asm) {
	if (right == null) {
	// throw an appropriate error
	return super.codeLValue(env, ctx, asm);
	} else {
	// Fully code the left-hand side. Do the LValue part of the
	// right-hand side now. The remainder will be done by codeLoad or
	// codeStore
	if (left != null) {
	left.code(env, ctx, asm);
	}
	return right.codeLValue(env, ctx, asm);
	}
	}

	void codeLoad(Environment env, Context ctx, Assembler asm) {
	// The left-hand part has already been handled by codeLValue.

	if (right == null) {
	// throw an appropriate error
	super.codeLoad(env, ctx, asm);
	} else {
	right.codeLoad(env, ctx, asm);
	}
	}

	void codeStore(Environment env, Context ctx, Assembler asm) {
	// The left-hand part has already been handled by codeLValue.
	if (right == null) {
	// throw an appropriate error
	super.codeStore(env, ctx, asm);
	} else {
	right.codeStore(env, ctx, asm);
	}
	}

	public void codeValue(Environment env, Context ctx, Assembler asm) {
	if (left != null) {
	left.code(env, ctx, asm);
	}
	right.codeValue(env, ctx, asm);
	}
	public void code(Environment env, Context ctx, Assembler asm) {
	if (left != null) {
	left.code(env, ctx, asm);
	}
	if (right != null) {
	right.code(env, ctx, asm);
	}
	}
	}

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