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Nops are removed

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de4dot 2011-10-20 00:47:38 +02:00
parent 28f95d386e
commit debc4b346a
1 changed files with 19 additions and 8 deletions
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27
blocks/cflow/DeadCodeRemover.cs
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@ -45,15 +45,26 @@ namespace de4dot.blocks.cflow {
var instructions = block.Instructions;
for (int i = 0; i < instructions.Count; i++) {
var instr = instructions[i];
if (instr.OpCode.Code != Code.Pop)
continue;
switch (instr.OpCode.Code) {
case Code.Nop:
// The NOP is recreated if the block is empty so don't remove it if it's
// the only instruction.
if (instructions.Count > 1)
allDeadInstructions.Add(i);
break;
instructionExpressionFinder.init(block, false);
if (!instructionExpressionFinder.find(i))
continue;
if (!okInstructions(block, instructionExpressionFinder.DeadInstructions))
continue;
allDeadInstructions.AddRange(instructionExpressionFinder.DeadInstructions);
case Code.Pop:
instructionExpressionFinder.init(block, false);
if (!instructionExpressionFinder.find(i))
continue;
if (!okInstructions(block, instructionExpressionFinder.DeadInstructions))
continue;
allDeadInstructions.AddRange(instructionExpressionFinder.DeadInstructions);
break;
default:
break;
}
}
block.remove(allDeadInstructions);