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Use methods from MethodUtils

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de4dot 2012-12-16 16:06:03 +01:00
parent a6cdee6985
commit ff7c2b320d
1 changed files with 3 additions and 73 deletions
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76
blocks/CodeGenerator.cs
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@ -73,79 +73,9 @@ namespace de4dot.blocks {
sortExceptions();
layOutInstructions(out allInstructions, out allExceptionHandlers);
foreach (var instr in allInstructions) {
if (instr.OpCode == OpCodes.Br_S) instr.OpCode = OpCodes.Br;
else if (instr.OpCode == OpCodes.Brfalse_S) instr.OpCode = OpCodes.Brfalse;
else if (instr.OpCode == OpCodes.Brtrue_S) instr.OpCode = OpCodes.Brtrue;
else if (instr.OpCode == OpCodes.Beq_S) instr.OpCode = OpCodes.Beq;
else if (instr.OpCode == OpCodes.Bge_S) instr.OpCode = OpCodes.Bge;
else if (instr.OpCode == OpCodes.Bgt_S) instr.OpCode = OpCodes.Bgt;
else if (instr.OpCode == OpCodes.Ble_S) instr.OpCode = OpCodes.Ble;
else if (instr.OpCode == OpCodes.Blt_S) instr.OpCode = OpCodes.Blt;
else if (instr.OpCode == OpCodes.Bne_Un_S) instr.OpCode = OpCodes.Bne_Un;
else if (instr.OpCode == OpCodes.Bge_Un_S) instr.OpCode = OpCodes.Bge_Un;
else if (instr.OpCode == OpCodes.Bgt_Un_S) instr.OpCode = OpCodes.Bgt_Un;
else if (instr.OpCode == OpCodes.Ble_Un_S) instr.OpCode = OpCodes.Ble_Un;
else if (instr.OpCode == OpCodes.Blt_Un_S) instr.OpCode = OpCodes.Blt_Un;
else if (instr.OpCode == OpCodes.Leave_S) instr.OpCode = OpCodes.Leave;
}
for (int i = 0; i < 10; i++) {
if (!optimizeBranches(allInstructions))
break;
}
recalculateInstructionOffsets(allInstructions);
}
void recalculateInstructionOffsets(IList<Instruction> allInstructions) {
uint offset = 0;
foreach (var instr in allInstructions) {
instr.Offset = offset;
offset += (uint)instr.GetSize();
}
}
bool getShortBranch(Instruction instruction, out OpCode opcode) {
switch (instruction.OpCode.Code) {
case Code.Br: opcode = OpCodes.Br_S; return true;
case Code.Brfalse: opcode = OpCodes.Brfalse_S; return true;
case Code.Brtrue: opcode = OpCodes.Brtrue_S; return true;
case Code.Beq: opcode = OpCodes.Beq_S; return true;
case Code.Bge: opcode = OpCodes.Bge_S; return true;
case Code.Bgt: opcode = OpCodes.Bgt_S; return true;
case Code.Ble: opcode = OpCodes.Ble_S; return true;
case Code.Blt: opcode = OpCodes.Blt_S; return true;
case Code.Bne_Un: opcode = OpCodes.Bne_Un_S; return true;
case Code.Bge_Un: opcode = OpCodes.Bge_Un_S; return true;
case Code.Bgt_Un: opcode = OpCodes.Bgt_Un_S; return true;
case Code.Ble_Un: opcode = OpCodes.Ble_Un_S; return true;
case Code.Blt_Un: opcode = OpCodes.Blt_Un_S; return true;
case Code.Leave: opcode = OpCodes.Leave_S; return true;
default: opcode = OpCodes.Nop; return false;
}
}
// Returns true if something was changed
bool optimizeBranches(IList<Instruction> allInstructions) {
bool changed = false;
recalculateInstructionOffsets(allInstructions);
for (int i = 0; i < allInstructions.Count; i++) {
var instruction = allInstructions[i];
OpCode opcode;
if (getShortBranch(instruction, out opcode)) {
const int instrSize = 5; // It's a long branch instruction
var target = (Instruction)instruction.Operand;
int distance = target == null ? int.MaxValue : (int)(target.Offset - (instruction.Offset + instrSize));
if (-0x80 <= distance && distance <= 0x7F) {
instruction.OpCode = opcode;
changed = true;
}
}
}
return changed;
allInstructions.SimplifyBranches();
allInstructions.OptimizeBranches();
allInstructions.UpdateInstructionOffsets();
}
class BlockInfo {