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