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100 lines
3.1 KiB
100 lines
3.1 KiB
/* Jump 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.GlobalOptions;
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/**
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* This class represents an unconditional jump.
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*/
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public class Jump {
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/**
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* The structured block that precedes this jump.
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*/
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StructuredBlock prev;
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/**
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* The destination block of this jump, null if not known, or illegal.
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*/
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FlowBlock destination;
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/**
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* The jumps in a flow block, that have the same destination, are
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* in a link list. This field points to the next jump in this link.
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*/
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Jump next;
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/**
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* The kill locals. This are the slots, which must be overwritten
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* in this block on every path to this jump. That means, that all
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* paths form the start of the current flow block to this jump
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* contain (unconditional) assignments to this slot.
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*/
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VariableSet kill;
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/**
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* The gen locals. This are the locals, which can be overwritten
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* in this block on a path to this jump. That means, that there
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* exists a path form the start of the current flow block to this
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* jump that contains an (unconditional) assignments to this
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* local, and that is not overwritten afterwards.
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*/
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VariableSet gen;
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/**
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* The stack map. This tells how many objects are on stack at
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* begin of the flow block, and to what locals they are maped.
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* @see FlowBlock.mapStackToLocal
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*/
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VariableStack stackMap;
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public Jump (FlowBlock dest) {
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this.destination = dest;
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kill = new VariableSet();
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gen = new VariableSet();
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}
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public Jump (Jump jump) {
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destination = jump.destination;
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next = jump.next;
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jump.next = this;
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gen = (VariableSet) jump.gen.clone();
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kill = (VariableSet) jump.kill.clone();
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}
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/**
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* Print the source code for this structured block. This handles
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* everything that is unique for all structured blocks and calls
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* dumpInstruction afterwards.
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* @param writer The tabbed print writer, where we print to.
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*/
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public void dumpSource(jode.decompiler.TabbedPrintWriter writer)
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throws java.io.IOException
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{
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if ((GlobalOptions.debuggingFlags
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& GlobalOptions.DEBUG_INOUT) != 0) {
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writer.println("gen : "+ gen.toString());
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writer.println("kill: "+ kill.toString());
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}
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if (destination == null)
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writer.println ("GOTO null-ptr!!!!!");
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else
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writer.println("GOTO "+destination.getLabel());
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}
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}
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