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jode/jode/CreateWhileStatements.java

60 lines
2.1 KiB

/*
* CreateWhileStatements (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 CreateWhileStatements extends FlowTransformation
implements Transformation {
public InstructionHeader transform(InstructionHeader gotoIH) {
if (gotoIH.flowType == gotoIH.IFGOTO &&
gotoIH.successors[1] == gotoIH)
/* This is an empty while loop
*/
return new WhileInstructionHeader(gotoIH, gotoIH);
if (gotoIH.flowType != gotoIH.GOTO ||
gotoIH.nextInstruction == null ||
gotoIH.successors[0].addr < gotoIH.nextInstruction.addr ||
gotoIH.outer != gotoIH.successors[0].outer)
return null;
InstructionHeader ifgoto = gotoIH.successors[0];
if (ifgoto.getFlowType() != ifgoto.IFGOTO ||
ifgoto.outer != ifgoto.successors[1].outer)
return null;
InstructionHeader next = UnoptimizeWhileLoops(ifgoto.successors[1]);
if (next != gotoIH.nextInstruction)
return null;
if (next != ifgoto.successors[1]) {
ifgoto.successors[1].predecessors.removeElement(ifgoto);
ifgoto.successors[1] = next;
ifgoto.successors[1].predecessors.addElement(ifgoto);
}
if(Decompiler.isVerbose)
System.err.print("w");
return new WhileInstructionHeader(gotoIH, ifgoto);
}
}