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124 lines
3.6 KiB
124 lines
3.6 KiB
/* JsrBlock Copyright (C) 1998-1999 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 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 General Public License
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* along with this program; see the file COPYING. 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 jode.flow;
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import jode.decompiler.LocalInfo;
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import jode.type.Type;
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/**
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* This block represents a jsr instruction. A jsr instruction is
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* used to call the finally block, or to call the monitorexit block in
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* a synchronized block.
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*
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* @author Jochen Hoenicke
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*/
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public class JsrBlock extends StructuredBlock {
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/**
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* The inner block that jumps to the subroutine.
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*/
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StructuredBlock innerBlock;
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boolean good = false;
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public JsrBlock() {
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innerBlock = new EmptyBlock();
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innerBlock.outer = this;
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}
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public void setGood(boolean g) {
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good = g;
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}
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public boolean isGood() {
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return good;
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}
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/**
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* Sets the successors of this structured block. This should be only
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* called once, by FlowBlock.setSuccessors().
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*/
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public void setSuccessors(Jump[] jumps) {
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if (jumps.length != 2) {
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/* A conditional block can only exactly two jumps. */
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throw new IllegalArgumentException("Not exactly two jumps.");
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}
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innerBlock.setJump(jumps[0]);
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setJump(jumps[1]);
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}
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/* The implementation of getNext[Flow]Block is the standard
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* implementation */
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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 (innerBlock == oldBlock)
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innerBlock = 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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/**
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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). <p>
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* The default implementation merges the stack after each sub block.
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* This may not be, what you want. <p>
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*
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* @param initialStack the stackmap at begin of the block
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* @return the stack after the block has executed.
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* @throw RuntimeException if something did get wrong.
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*/
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public VariableStack mapStackToLocal(VariableStack stack) {
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/* There shouldn't be any JSR blocks remaining, but who knows.
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*/
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/* The innerBlock is startet with a new stack entry (return address)
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* It should GOTO immediately and never complete.
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*/
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LocalInfo retAddr = new LocalInfo();
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retAddr.setType(Type.tUObject);
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innerBlock.mapStackToLocal(stack.push(retAddr));
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if (jump != null) {
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jump.stackMap = stack;
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return null;
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}
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return stack;
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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[] { innerBlock };
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}
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public void dumpInstruction(jode.decompiler.TabbedPrintWriter writer)
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throws java.io.IOException
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{
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writer.println("JSR");
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writer.tab();
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innerBlock.dumpSource(writer);
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writer.untab();
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}
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}
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