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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 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 CompoundStatement extends Statement {
	Statement args[];

	/**
	* Constructor
	*/
	public CompoundStatement(long where, Statement args[]) {
	super(STAT, where);
	this.args = args;
	// To avoid the need for subsequent null checks:
	for (int i = 0 ; i < args.length ; i++) {
	if (args[i] == null) {
	args[i] = new CompoundStatement(where, new Statement[0]);
	}
	}
	}

	/**
	* Insert a new statement at the front.
	* This is used to introduce an implicit super-class constructor call.
	*/
	public void insertStatement(Statement s) {
	Statement newargs[] = new Statement[1+args.length];
	newargs[0] = s;
	for (int i = 0 ; i < args.length ; i++) {
	newargs[i+1] = args[i];
	}
	this.args = newargs;
	}

	/**
	* Check statement
	*/
	Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
	checkLabel(env, ctx);
	if (args.length > 0) {
	vset = reach(env, vset);
	CheckContext newctx = new CheckContext(ctx, this);
	// In this environment, 'resolveName' will look for local classes.
	Environment newenv = Context.newEnvironment(env, newctx);
	for (int i = 0 ; i < args.length ; i++) {
	vset = args[i].checkBlockStatement(newenv, newctx, vset, exp);
	}
	vset = vset.join(newctx.vsBreak);
	}
	return ctx.removeAdditionalVars(vset);
	}

	/**
	* Inline
	*/
	public Statement inline(Environment env, Context ctx) {
	ctx = new Context(ctx, this);
	boolean expand = false;
	int count = 0;
	for (int i = 0 ; i < args.length ; i++) {
	Statement s = args[i];
	if (s != null) {
	if ((s = s.inline(env, ctx)) != null) {
	if ((s.op == STAT) && (s.labels == null)) {
	count += ((CompoundStatement)s).args.length;
	} else {
	count++;
	}
	expand = true;
	}
	args[i] = s;
	}
	}
	switch (count) {
	case 0:
	return null;

	case 1:
	for (int i = args.length ; i-- > 0 ;) {
	if (args[i] != null) {
	return eliminate(env, args[i]);
	}
	}
	break;
	}
	if (expand \|\| (count != args.length)) {
	Statement newArgs[] = new Statement[count];
	for (int i = args.length ; i-- > 0 ;) {
	Statement s = args[i];
	if (s != null) {
	if ((s.op == STAT) && (s.labels == null)) {
	Statement a[] = ((CompoundStatement)s).args;
	for (int j = a.length ; j-- > 0 ; ) {
	newArgs[--count] = a[j];
	}
	} else {
	newArgs[--count] = s;
	}
	}
	}
	args = newArgs;
	}
	return this;
	}

	/**
	* Create a copy of the statement for method inlining
	*/
	public Statement copyInline(Context ctx, boolean valNeeded) {
	CompoundStatement s = (CompoundStatement)clone();
	s.args = new Statement[args.length];
	for (int i = 0 ; i < args.length ; i++) {
	s.args[i] = args[i].copyInline(ctx, valNeeded);
	}
	return s;
	}

	/**
	* The cost of inlining this statement
	*/
	public int costInline(int thresh, Environment env, Context ctx) {
	int cost = 0;
	for (int i = 0 ; (i < args.length) && (cost < thresh) ; i++) {
	cost += args[i].costInline(thresh, env, ctx);
	}
	return cost;
	}

	/**
	* Code
	*/
	public void code(Environment env, Context ctx, Assembler asm) {
	CodeContext newctx = new CodeContext(ctx, this);
	for (int i = 0 ; i < args.length ; i++) {
	args[i].code(env, newctx, asm);
	}
	asm.add(newctx.breakLabel);
	}

	/**
	* Check if the first thing is a constructor invocation
	*/
	public Expression firstConstructor() {
	return (args.length > 0) ? args[0].firstConstructor() : null;
	}

	/**
	* Print
	*/
	public void print(PrintStream out, int indent) {
	super.print(out, indent);
	out.print("{\n");
	for (int i = 0 ; i < args.length ; i++) {
	printIndent(out, indent+1);
	if (args[i] != null) {
	args[i].print(out, indent + 1);
	} else {
	out.print("<empty>");
	}
	out.print("\n");
	}
	printIndent(out, indent);
	out.print("}");
	}
	}

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