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162 lines
4.4 KiB
162 lines
4.4 KiB
12 years ago
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/* LoopBlock 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: LoopBlock.java 1411 2012-03-01 22:39:08Z hoenicke $
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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 Loop block.
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*/
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public class LabelledBlock extends StructuredBlock implements BreakableBlock {
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/**
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* The body of this labelled block. This is always a valid block and not null.
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*/
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StructuredBlock bodyBlock;
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/**
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* The stack after the break.
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*/
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VariableStack breakedStack;
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/**
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* The serial number for labels.
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*/
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static int serialno = 0;
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/**
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* The label of this instruction, or null if it needs no label.
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*/
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String label = null;
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public LabelledBlock() {
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}
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public void setBody(StructuredBlock body) {
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bodyBlock = body;
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bodyBlock.outer = this;
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body.setFlowBlock(flowBlock);
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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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return false;
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bodyBlock = newBlock;
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newBlock.outer = this;
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oldBlock.outer = null;
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return true;
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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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public void dumpSource(TabbedPrintWriter writer)
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throws java.io.IOException
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{
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super.dumpSource(writer);
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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 (label != null) {
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writer.untab();
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writer.println(label+":");
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writer.tab();
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}
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boolean needBrace = bodyBlock.needsBraces();
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if (needBrace)
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writer.openBrace();
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else
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writer.println();
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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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/**
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* Returns the label of this block and creates a new label, if
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* there wasn't a label previously.
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*/
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public String getLabel() {
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if (label == null)
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label = "label_"+(serialno++);
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return label;
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}
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/**
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* Is called by BreakBlock, to tell us that this block is breaked.
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*/
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public void setBreaked() {
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}
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/**
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* This is called after the analysis is completely done. It
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* will remove all PUSH/stack_i expressions, (if the bytecode
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* is correct).
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* @param stack the stack at begin of the block
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* @return null if there is no way to the end of this block,
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* otherwise the stack after the block has executed.
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*/
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public VariableStack mapStackToLocal(VariableStack stack) {
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VariableStack afterBody = bodyBlock.mapStackToLocal(stack);
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mergeBreakedStack(afterBody);
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return breakedStack;
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}
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/**
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* Is called by BreakBlock, to tell us what the stack can be after a
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* break.
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* @return false if the stack is inconsistent.
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*/
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public void mergeBreakedStack(VariableStack stack) {
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if (breakedStack != null)
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breakedStack.merge(stack);
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else
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breakedStack = stack;
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}
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public void removePush() {
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bodyBlock.removePush();
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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 false;
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}
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}
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