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127 lines
3.5 KiB
127 lines
3.5 KiB
/* SynchronizedBlock Copyright (C) 1998-2002 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; see the file COPYING.LESSER. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.flow;
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import net.sf.jode.decompiler.LocalInfo;
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import net.sf.jode.decompiler.TabbedPrintWriter;
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import net.sf.jode.expr.Expression;
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import net.sf.jode.util.SimpleSet;
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///#def COLLECTIONS java.util
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import java.util.Set;
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///#enddef
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/**
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* This class represents a synchronized structured block.
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*
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* @author Jochen Hoenicke
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*/
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public class SynchronizedBlock extends StructuredBlock {
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Expression object;
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LocalInfo local;
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boolean isEntered;
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StructuredBlock bodyBlock;
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public SynchronizedBlock(LocalInfo local) {
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this.local = local;
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}
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/**
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* Sets the body block.
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*/
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public void setBodyBlock(StructuredBlock body) {
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bodyBlock = body;
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body.outer = this;
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body.setFlowBlock(flowBlock);
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}
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/**
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* Returns all sub block of this structured block.
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*/
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public StructuredBlock[] getSubBlocks() {
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return new StructuredBlock[] { bodyBlock };
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}
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/**
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* Replaces the given sub block with a new block.
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* @param oldBlock the old sub block.
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* @param newBlock the new sub block.
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* @return false, if oldBlock wasn't a direct sub block.
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*/
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public boolean replaceSubBlock(StructuredBlock oldBlock,
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StructuredBlock newBlock) {
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if (bodyBlock == oldBlock)
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bodyBlock = newBlock;
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else
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return false;
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return true;
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}
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public Set getDeclarables() {
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Set used = new SimpleSet();
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if (object != null)
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object.fillDeclarables(used);
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else
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used.add(local);
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return used;
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}
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public void dumpInstruction(TabbedPrintWriter writer)
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throws java.io.IOException
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{
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if (!isEntered)
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writer.println("MISSING MONITORENTER");
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writer.print("synchronized (");
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if (object != null)
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object.dumpExpression(TabbedPrintWriter.EXPL_PAREN, writer);
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else
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writer.print(local.getName());
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writer.print(")");
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writer.openBrace();
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writer.tab();
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bodyBlock.dumpSource(writer);
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writer.untab();
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writer.closeBrace();
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}
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public void simplify() {
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if (object != null)
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object = object.simplify();
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super.simplify();
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}
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/**
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* Determines if there is a sub block, that flows through to the end
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* of this block. If this returns true, you know that jump is null.
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* @return true, if the jump may be safely changed.
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*/
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public boolean jumpMayBeChanged() {
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return (bodyBlock.jump != null || bodyBlock.jumpMayBeChanged());
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}
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public boolean doTransformations() {
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StructuredBlock last = flowBlock.lastModified;
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return (!isEntered && CompleteSynchronized.enter(this, last))
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|| (isEntered && object == null
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&& CompleteSynchronized.combineObject(this, last));
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}
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}
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