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jode/jode/CreateBreakStatement.java

77 lines
2.9 KiB

/*
* CreateBreakStatement (c) 1998 Jochen Hoenicke
*
* You may distribute under the terms of the GNU General Public License.
*
* IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
* THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE
* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
* BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* $Id$
*/
package jode;
public class CreateBreakStatement implements Transformation {
public InstructionHeader transform(InstructionHeader ih) {
InstructionHeader breakDest;
if (ih.getFlowType() == ih.GOTO)
breakDest = ih.successors[0].getShadow();
else if (ih.getFlowType() == ih.IFGOTO)
breakDest = ih.successors[1].getShadow();
else
return null;
if (breakDest == ih.getEndBlock()) {
/* This is an unnecessary goto, remove it.
*/
if (ih.prevInstruction != null)
ih.prevInstruction.nextInstruction = ih.nextInstruction;
if (ih.nextInstruction != null)
ih.nextInstruction.prevInstruction = ih.prevInstruction;
breakDest.addPredecessors(ih);
breakDest.predecessors.removeElement(ih);
if (Decompiler.isVerbose)
System.err.print("g");
return null;
}
boolean needBreakLabel = false, needContLabel = false;
InstructionHeader outer = ih.outer;
while (outer != null) {
if (outer.getBreak() == breakDest) {
if (Decompiler.isVerbose)
System.err.print("b");
return new BreakInstructionHeader
(ih.BREAK, ih, needBreakLabel?outer.getLabel(): null);
}
if (outer.getContinue() == breakDest) {
if (Decompiler.isVerbose)
System.err.print("c");
return new BreakInstructionHeader
(ih.CONTINUE, ih, needContLabel?outer.getLabel(): null);
}
if (outer.outer == null && outer.getEndBlock() == breakDest) {
if (Decompiler.isVerbose)
System.err.print("r");
return new BreakInstructionHeader
(ih.VOIDRETURN, ih, null);
}
if (outer.getBreak() != null)
needBreakLabel = true;
if (outer.getContinue() != null)
needContLabel = true;
outer = outer.outer;
}
return null;
}
}