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79 lines
2.2 KiB
79 lines
2.2 KiB
/* EmptyBlock 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.TabbedPrintWriter;
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/**
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* This is the structured block for an empty block.
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*/
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public class EmptyBlock extends StructuredBlock {
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public EmptyBlock() {
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}
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public EmptyBlock(Jump jump) {
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setJump(jump);
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}
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/**
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* Tells if this block is empty and only changes control flow.
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*/
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public boolean isEmpty() {
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return true;
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}
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/**
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* Appends a block to this block.
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* @return the new combined block.
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*/
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public StructuredBlock appendBlock(StructuredBlock block) {
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if (outer instanceof ConditionalBlock) {
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IfThenElseBlock ifBlock =
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new IfThenElseBlock(((ConditionalBlock)outer).
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getInstruction());
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ifBlock.moveDefinitions(outer, this);
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ifBlock.replace(outer);
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ifBlock.moveJump(outer.jump);
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ifBlock.setThenBlock(this);
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}
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block.replace(this);
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return block;
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}
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/**
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* Prepends a block to this block.
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* @return the new combined block.
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*/
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public StructuredBlock prependBlock(StructuredBlock block) {
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/* For empty blocks: append == prepend modulo jump */
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block = appendBlock(block);
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block.moveJump(this.jump);
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return block;
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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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/* Only print the comment if jump null, since otherwise the block
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* isn't completely empty ;-)
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*/
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if (jump == null)
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writer.println("/* empty */");
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}
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}
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