/*
* $Id: SynchronizedStatement.java,v 1.4 2002/09/16 08:05:06 jkl Exp $
*
* Copyright (c) 2002 Njet Communications Ltd. All Rights Reserved.
*
* Use is subject to license terms, as defined in
* Anvil Sofware License, Version 1.1. See LICENSE
* file, or http://njet.org/license-1.1.txt
*/
package anvil.script.statements;
import anvil.core.Any;
import anvil.Location;
import anvil.codec.Code;
import anvil.codec.Source;
import anvil.codec.Target;
import anvil.codec.ExceptionHandler;
import anvil.parser.Tag;
import anvil.ErrorListener;
import anvil.script.compiler.ByteCompiler;
import anvil.script.Context;
import anvil.script.expression.Expression;
import anvil.script.parser.TemplateParser;
import anvil.script.Grammar;
import java.io.IOException;
/**
* class SynchronizedStatement
*
* @author: Jani Lehtim�ki
*/
public class SynchronizedStatement extends ScopedStatement
{
private Expression _expression = null;
private Statement _statement = EMPTY;
private ExceptionHandler _handler;
public SynchronizedStatement(Statement parent, Location location, Expression condition)
{
super(parent, location);
_expression = condition;
}
public int typeOf()
{
return Statement.ST_SYNCHRONIZED;
}
public String name()
{
return "synchronized";
}
public void parse(TemplateParser parser, Tag tag)
{
}
public boolean onTag(TemplateParser parser, int type, Tag tag)
{
return true;
}
public Statement getChildStatement()
{
return _statement;
}
public void setChildStatement(Statement statement)
{
_statement = statement;
}
public void check(ErrorListener context)
{
_expression.check(context);
_statement.check(context);
}
public Jumps eliminate(ErrorListener context)
{
Jumps jumps = _statement.eliminate(context);
return jumps;
}
public void compile(ByteCompiler context)
{
Code code = context.getCode();
int lock = code.addLocal();
_expression.compile(context, Expression.GET);
code.astore(lock);
code.aload(lock);
code.monitorenter();
ExceptionHandler handler = code.startExceptionHandler(true);
_handler = handler;
if (_statement == null) {
code.nop();
} else {
_statement.compile(context);
}
handler.endTry();
if (!_statement.isBlocked()) {
handler.callFinally();
handler.jumpOut();
}
handler.endProtectedRegion();
handler.startCatch(0);
int thrown = code.addLocal();
code.astore(thrown);
handler.callFinally();
code.aload(thrown);
code.athrow();
handler.endCatches();
_handler = null;
handler.startFinally();
int returnto = code.addLocal();
code.astore(returnto);
code.aload(lock);
code.monitorexit();
code.ret(returnto);
handler.endFinally();
handler.end();
code.endLocal(lock);
}
public boolean callFinalizer()
{
_handler.callFinally();
return false;
}
}