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	/*
	* Copyright (c) 1994, 2004, 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 sun.tools.asm.LocalVariable;
	import sun.tools.asm.Label;
	import java.io.PrintStream;
	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 CatchStatement extends Statement {
	int mod;
	Expression texpr;
	Identifier id;
	Statement body;
	LocalMember field;

	/**
	* Constructor
	*/
	public CatchStatement(long where, Expression texpr, IdentifierToken id, Statement body) {
	super(CATCH, where);
	this.mod = id.getModifiers();
	this.texpr = texpr;
	this.id = id.getName();
	this.body = body;
	}
	/** @deprecated */
	@Deprecated
	public CatchStatement(long where, Expression texpr, Identifier id, Statement body) {
	super(CATCH, where);
	this.texpr = texpr;
	this.id = id;
	this.body = body;
	}

	/**
	* Check statement
	*/
	Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
	vset = reach(env, vset);
	ctx = new Context(ctx, this);
	Type type = texpr.toType(env, ctx);

	try {
	if (ctx.getLocalField(id) != null) {
	env.error(where, "local.redefined", id);
	}

	if (type.isType(TC_ERROR)) {
	// error message printed out elsewhere
	} else if (!type.isType(TC_CLASS)) {
	env.error(where, "catch.not.throwable", type);
	} else {
	ClassDefinition def = env.getClassDefinition(type);
	if (!def.subClassOf(env,
	env.getClassDeclaration(idJavaLangThrowable))) {
	env.error(where, "catch.not.throwable", def);
	}
	}

	field = new LocalMember(where, ctx.field.getClassDefinition(), mod, type, id);
	ctx.declare(env, field);
	vset.addVar(field.number);

	return body.check(env, ctx, vset, exp);
	} catch (ClassNotFound e) {
	env.error(where, "class.not.found", e.name, opNames[op]);
	return vset;
	}
	}

	/**
	* Inline
	*/
	public Statement inline(Environment env, Context ctx) {
	ctx = new Context(ctx, this);
	if (field.isUsed()) {
	ctx.declare(env, field);
	}
	if (body != null) {
	body = body.inline(env, ctx);
	}
	return this;
	}

	/**
	* Create a copy of the statement for method inlining
	*/
	public Statement copyInline(Context ctx, boolean valNeeded) {
	CatchStatement s = (CatchStatement)clone();
	if (body != null) {
	s.body = body.copyInline(ctx, valNeeded);
	}
	if (field != null) {
	s.field = field.copyInline(ctx);
	}
	return s;
	}

	/**
	* Compute cost of inlining this statement
	*/
	public int costInline(int thresh, Environment env, Context ctx){
	int cost = 1;
	if (body != null) {
	cost += body.costInline(thresh, env,ctx);
	}
	return cost;
	}

	/**
	* Code
	*/
	public void code(Environment env, Context ctx, Assembler asm) {
	CodeContext newctx = new CodeContext(ctx, this);
	if (field.isUsed()) {
	newctx.declare(env, field);
	asm.add(where, opc_astore, new LocalVariable(field, field.number));
	} else {
	asm.add(where, opc_pop);
	}
	if (body != null) {
	body.code(env, newctx, asm);
	}
	//asm.add(newctx.breakLabel);
	}

	/**
	* Print
	*/
	public void print(PrintStream out, int indent) {
	super.print(out, indent);
	out.print("catch (");
	texpr.print(out);
	out.print(" " + id + ") ");
	if (body != null) {
	body.print(out, indent);
	} else {
	out.print("<empty>");
	}
	}
	}

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