forked from jbevain/cecil
/
MethodBodyRocks.cs
412 lines (388 loc) · 10.4 KB
/
MethodBodyRocks.cs
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//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2015 Jb Evain
// Copyright (c) 2008 - 2011 Novell, Inc.
//
// Licensed under the MIT/X11 license.
//
using System;
using Mono.Cecil.Cil;
namespace Mono.Cecil.Rocks {
#if INSIDE_ROCKS
public
#endif
static class MethodBodyRocks {
public static void SimplifyMacros (this MethodBody self)
{
if (self == null)
throw new ArgumentNullException ("self");
foreach (var instruction in self.Instructions) {
if (instruction.OpCode.OpCodeType != OpCodeType.Macro)
continue;
switch (instruction.OpCode.Code) {
case Code.Ldarg_0:
ExpandMacro (instruction, OpCodes.Ldarg, self.GetParameter (0));
break;
case Code.Ldarg_1:
ExpandMacro (instruction, OpCodes.Ldarg, self.GetParameter (1));
break;
case Code.Ldarg_2:
ExpandMacro (instruction, OpCodes.Ldarg, self.GetParameter (2));
break;
case Code.Ldarg_3:
ExpandMacro (instruction, OpCodes.Ldarg, self.GetParameter (3));
break;
case Code.Ldloc_0:
ExpandMacro (instruction, OpCodes.Ldloc, self.Variables [0]);
break;
case Code.Ldloc_1:
ExpandMacro (instruction, OpCodes.Ldloc, self.Variables [1]);
break;
case Code.Ldloc_2:
ExpandMacro (instruction, OpCodes.Ldloc, self.Variables [2]);
break;
case Code.Ldloc_3:
ExpandMacro (instruction, OpCodes.Ldloc, self.Variables [3]);
break;
case Code.Stloc_0:
ExpandMacro (instruction, OpCodes.Stloc, self.Variables [0]);
break;
case Code.Stloc_1:
ExpandMacro (instruction, OpCodes.Stloc, self.Variables [1]);
break;
case Code.Stloc_2:
ExpandMacro (instruction, OpCodes.Stloc, self.Variables [2]);
break;
case Code.Stloc_3:
ExpandMacro (instruction, OpCodes.Stloc, self.Variables [3]);
break;
case Code.Ldarg_S:
instruction.OpCode = OpCodes.Ldarg;
break;
case Code.Ldarga_S:
instruction.OpCode = OpCodes.Ldarga;
break;
case Code.Starg_S:
instruction.OpCode = OpCodes.Starg;
break;
case Code.Ldloc_S:
instruction.OpCode = OpCodes.Ldloc;
break;
case Code.Ldloca_S:
instruction.OpCode = OpCodes.Ldloca;
break;
case Code.Stloc_S:
instruction.OpCode = OpCodes.Stloc;
break;
case Code.Ldc_I4_M1:
ExpandMacro (instruction, OpCodes.Ldc_I4, -1);
break;
case Code.Ldc_I4_0:
ExpandMacro (instruction, OpCodes.Ldc_I4, 0);
break;
case Code.Ldc_I4_1:
ExpandMacro (instruction, OpCodes.Ldc_I4, 1);
break;
case Code.Ldc_I4_2:
ExpandMacro (instruction, OpCodes.Ldc_I4, 2);
break;
case Code.Ldc_I4_3:
ExpandMacro (instruction, OpCodes.Ldc_I4, 3);
break;
case Code.Ldc_I4_4:
ExpandMacro (instruction, OpCodes.Ldc_I4, 4);
break;
case Code.Ldc_I4_5:
ExpandMacro (instruction, OpCodes.Ldc_I4, 5);
break;
case Code.Ldc_I4_6:
ExpandMacro (instruction, OpCodes.Ldc_I4, 6);
break;
case Code.Ldc_I4_7:
ExpandMacro (instruction, OpCodes.Ldc_I4, 7);
break;
case Code.Ldc_I4_8:
ExpandMacro (instruction, OpCodes.Ldc_I4, 8);
break;
case Code.Ldc_I4_S:
ExpandMacro (instruction, OpCodes.Ldc_I4, (int) (sbyte) instruction.Operand);
break;
case Code.Br_S:
instruction.OpCode = OpCodes.Br;
break;
case Code.Brfalse_S:
instruction.OpCode = OpCodes.Brfalse;
break;
case Code.Brtrue_S:
instruction.OpCode = OpCodes.Brtrue;
break;
case Code.Beq_S:
instruction.OpCode = OpCodes.Beq;
break;
case Code.Bge_S:
instruction.OpCode = OpCodes.Bge;
break;
case Code.Bgt_S:
instruction.OpCode = OpCodes.Bgt;
break;
case Code.Ble_S:
instruction.OpCode = OpCodes.Ble;
break;
case Code.Blt_S:
instruction.OpCode = OpCodes.Blt;
break;
case Code.Bne_Un_S:
instruction.OpCode = OpCodes.Bne_Un;
break;
case Code.Bge_Un_S:
instruction.OpCode = OpCodes.Bge_Un;
break;
case Code.Bgt_Un_S:
instruction.OpCode = OpCodes.Bgt_Un;
break;
case Code.Ble_Un_S:
instruction.OpCode = OpCodes.Ble_Un;
break;
case Code.Blt_Un_S:
instruction.OpCode = OpCodes.Blt_Un;
break;
case Code.Leave_S:
instruction.OpCode = OpCodes.Leave;
break;
}
}
}
static void ExpandMacro (Instruction instruction, OpCode opcode, object operand)
{
instruction.OpCode = opcode;
instruction.Operand = operand;
}
static void MakeMacro (Instruction instruction, OpCode opcode)
{
instruction.OpCode = opcode;
instruction.Operand = null;
}
public static void Optimize (this MethodBody self)
{
if (self == null)
throw new ArgumentNullException ("self");
OptimizeLongs (self);
OptimizeMacros (self);
}
static void OptimizeLongs (this MethodBody self)
{
for (var i = 0; i < self.Instructions.Count; i++) {
var instruction = self.Instructions [i];
if (instruction.OpCode.Code != Code.Ldc_I8)
continue;
var l = (long) instruction.Operand;
if (l >= int.MaxValue || l <= int.MinValue)
continue;
ExpandMacro (instruction, OpCodes.Ldc_I4, (int) l);
self.Instructions.Insert (++i, Instruction.Create (OpCodes.Conv_I8));
}
}
public static void OptimizeMacros (this MethodBody self)
{
if (self == null)
throw new ArgumentNullException ("self");
var method = self.Method;
foreach (var instruction in self.Instructions) {
int index;
switch (instruction.OpCode.Code) {
case Code.Ldarg:
index = ((ParameterDefinition) instruction.Operand).Index;
if (index == -1 && instruction.Operand == self.ThisParameter)
index = 0;
else if (method.HasThis)
index++;
switch (index) {
case 0:
MakeMacro (instruction, OpCodes.Ldarg_0);
break;
case 1:
MakeMacro (instruction, OpCodes.Ldarg_1);
break;
case 2:
MakeMacro (instruction, OpCodes.Ldarg_2);
break;
case 3:
MakeMacro (instruction, OpCodes.Ldarg_3);
break;
default:
if (index < 256)
ExpandMacro (instruction, OpCodes.Ldarg_S, instruction.Operand);
break;
}
break;
case Code.Ldloc:
index = ((VariableDefinition) instruction.Operand).Index;
switch (index) {
case 0:
MakeMacro (instruction, OpCodes.Ldloc_0);
break;
case 1:
MakeMacro (instruction, OpCodes.Ldloc_1);
break;
case 2:
MakeMacro (instruction, OpCodes.Ldloc_2);
break;
case 3:
MakeMacro (instruction, OpCodes.Ldloc_3);
break;
default:
if (index < 256)
ExpandMacro (instruction, OpCodes.Ldloc_S, instruction.Operand);
break;
}
break;
case Code.Stloc:
index = ((VariableDefinition) instruction.Operand).Index;
switch (index) {
case 0:
MakeMacro (instruction, OpCodes.Stloc_0);
break;
case 1:
MakeMacro (instruction, OpCodes.Stloc_1);
break;
case 2:
MakeMacro (instruction, OpCodes.Stloc_2);
break;
case 3:
MakeMacro (instruction, OpCodes.Stloc_3);
break;
default:
if (index < 256)
ExpandMacro (instruction, OpCodes.Stloc_S, instruction.Operand);
break;
}
break;
case Code.Ldarga:
index = ((ParameterDefinition) instruction.Operand).Index;
if (index == -1 && instruction.Operand == self.ThisParameter)
index = 0;
else if (method.HasThis)
index++;
if (index < 256)
ExpandMacro (instruction, OpCodes.Ldarga_S, instruction.Operand);
break;
case Code.Ldloca:
if (((VariableDefinition) instruction.Operand).Index < 256)
ExpandMacro (instruction, OpCodes.Ldloca_S, instruction.Operand);
break;
case Code.Ldc_I4:
int i = (int) instruction.Operand;
switch (i) {
case -1:
MakeMacro (instruction, OpCodes.Ldc_I4_M1);
break;
case 0:
MakeMacro (instruction, OpCodes.Ldc_I4_0);
break;
case 1:
MakeMacro (instruction, OpCodes.Ldc_I4_1);
break;
case 2:
MakeMacro (instruction, OpCodes.Ldc_I4_2);
break;
case 3:
MakeMacro (instruction, OpCodes.Ldc_I4_3);
break;
case 4:
MakeMacro (instruction, OpCodes.Ldc_I4_4);
break;
case 5:
MakeMacro (instruction, OpCodes.Ldc_I4_5);
break;
case 6:
MakeMacro (instruction, OpCodes.Ldc_I4_6);
break;
case 7:
MakeMacro (instruction, OpCodes.Ldc_I4_7);
break;
case 8:
MakeMacro (instruction, OpCodes.Ldc_I4_8);
break;
default:
if (i >= -128 && i < 128)
ExpandMacro (instruction, OpCodes.Ldc_I4_S, (sbyte) i);
break;
}
break;
}
}
OptimizeBranches (self);
}
static void OptimizeBranches (MethodBody body)
{
ComputeOffsets (body);
foreach (var instruction in body.Instructions) {
if (instruction.OpCode.OperandType != OperandType.InlineBrTarget)
continue;
if (OptimizeBranch (instruction))
ComputeOffsets (body);
}
}
static bool OptimizeBranch (Instruction instruction)
{
var offset = ((Instruction) instruction.Operand).Offset - (instruction.Offset + instruction.OpCode.Size + 4);
if (!(offset >= -128 && offset <= 127))
return false;
switch (instruction.OpCode.Code) {
case Code.Br:
instruction.OpCode = OpCodes.Br_S;
break;
case Code.Brfalse:
instruction.OpCode = OpCodes.Brfalse_S;
break;
case Code.Brtrue:
instruction.OpCode = OpCodes.Brtrue_S;
break;
case Code.Beq:
instruction.OpCode = OpCodes.Beq_S;
break;
case Code.Bge:
instruction.OpCode = OpCodes.Bge_S;
break;
case Code.Bgt:
instruction.OpCode = OpCodes.Bgt_S;
break;
case Code.Ble:
instruction.OpCode = OpCodes.Ble_S;
break;
case Code.Blt:
instruction.OpCode = OpCodes.Blt_S;
break;
case Code.Bne_Un:
instruction.OpCode = OpCodes.Bne_Un_S;
break;
case Code.Bge_Un:
instruction.OpCode = OpCodes.Bge_Un_S;
break;
case Code.Bgt_Un:
instruction.OpCode = OpCodes.Bgt_Un_S;
break;
case Code.Ble_Un:
instruction.OpCode = OpCodes.Ble_Un_S;
break;
case Code.Blt_Un:
instruction.OpCode = OpCodes.Blt_Un_S;
break;
case Code.Leave:
instruction.OpCode = OpCodes.Leave_S;
break;
}
return true;
}
static void ComputeOffsets (MethodBody body)
{
var offset = 0;
foreach (var instruction in body.Instructions) {
instruction.Offset = offset;
offset += instruction.GetSize ();
}
}
}
}