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Cosmos/source2/IL2PCU/Cosmos.IL2CPU/ILReader.cs
kudzu_cp a878d651a3
2009-07-25 03:22:12 +00:00

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C#
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
namespace Cosmos.IL2CPU {
public class ILReader {
// We split this into two arrays since we have to read
// a byte at a time anways. In the future if we need to
// back to a unifed array, instead of 64k entries
// we can change it to a signed int, and then add x0200 to the value.
// This will reduce array size down to 768 entries.
protected OpCode[] mOpCodesLo = new OpCode[256];
protected OpCode[] mOpCodesHi = new OpCode[256];
public ILReader() {
LoadOpCodes();
}
protected void LoadOpCodes() {
foreach (var xField in typeof(OpCodes).GetFields(BindingFlags.DeclaredOnly | BindingFlags.Static | BindingFlags.Public)) {
var xOpCode = (OpCode)xField.GetValue(null);
var xValue = (ushort)xOpCode.Value;
if (xValue <= 0xFF) {
mOpCodesLo[xValue] = xOpCode;
} else {
mOpCodesHi[xValue & 0xFF] = xOpCode;
}
}
}
public List<ILOpCode> ProcessMethod(MethodBase aMethod) {
var xResult = new List<ILOpCode>();
var xBody = aMethod.GetMethodBody();
// Some methods return no body. Not sure why.. have to investigate
// They arent abstracts or icalls...
if (xBody == null) {
return null;
}
var xIL = xBody.GetILAsByteArray();
int xPos = 0;
while (xPos < xIL.Length) {
ILOpCode.Code xOpCodeVal;
OpCode xOpCode;
if (xIL[xPos] == 0xFE) {
xOpCodeVal = (ILOpCode.Code)(0xFE00 | xIL[xPos + 1]);
xOpCode = mOpCodesHi[xIL[xPos + 1]];
xPos = xPos + 2;
} else {
xOpCodeVal = (ILOpCode.Code)xIL[xPos];
xOpCode = mOpCodesLo[xIL[xPos]];
xPos++;
}
ILOpCode xILOpCode = null;
switch (xOpCode.OperandType) {
// No operand.
case OperandType.InlineNone:
xILOpCode = new ILOpCodes.OpNone(xOpCodeVal);
break;
// 8-bit integer branch target.
case OperandType.ShortInlineBrTarget:
//TODO: Complete this section
xILOpCode = new ILOpCodes.OpBranch(xOpCodeVal, 0);
xPos = xPos + 1;
break;
// The operand is a 32-bit integer branch target.
case OperandType.InlineBrTarget:
//TODO: Complete this section
xILOpCode = new ILOpCodes.OpBranch(xOpCodeVal, 0);
xPos = xPos + 4;
break;
// The operand is an 8-bit integer.
case OperandType.ShortInlineI:
xILOpCode = new ILOpCodes.OpInt(xOpCodeVal, xIL[xPos]);
xPos = xPos + 1;
break;
// The operand is a 32-bit integer.
case OperandType.InlineI:
xILOpCode = new ILOpCodes.OpInt(xOpCodeVal, ReadUInt32(xIL, xPos));
xPos = xPos + 4;
break;
// The operand is a 64-bit integer.
case OperandType.InlineI8:
xILOpCode = new ILOpCodes.OpInt64(xOpCodeVal, ReadUInt64(xIL, xPos));
xPos = xPos + 8;
break;
// 32-bit IEEE floating point number.
case OperandType.ShortInlineR:
xILOpCode = new ILOpCodes.OpSingle(xOpCodeVal, BitConverter.ToSingle(xIL, xPos));
xPos = xPos + 4;
break;
// 64-bit IEEE floating point number.
case OperandType.InlineR:
xILOpCode = new ILOpCodes.OpDouble(xOpCodeVal, BitConverter.ToDouble(xIL, xPos));
xPos = xPos + 8;
break;
// The operand is a 32-bit metadata token.
case OperandType.InlineField: {
//TODO: Complete this section
//public FieldInfo OperandValueField {
// Type[] xTypeGenArgs = null;
// Type[] xMethodGenArgs = null;
// if (mMethod.DeclaringType.IsGenericType)
// {
// xTypeGenArgs = mMethod.DeclaringType.GetGenericArguments();
// }
// if (mMethod.IsGenericMethod)
// {
// xMethodGenArgs = mMethod.GetGenericArguments();
// }
// mOperandValueField = mModule.ResolveField(OperandValueInt32,
// xTypeGenArgs,
// xMethodGenArgs);
// return mOperandValueField;
xILOpCode = new ILOpCodes.OpField(xOpCodeVal, 0);
xPos = xPos + 4;
break;
}
// The operand is a 32-bit metadata token.
case OperandType.InlineMethod: {
//TODO: Complete this section
UInt32 xValue = ReadUInt32(xIL, xPos);
if (((xValue & 0x6000000) == 0x6000000)
|| ((xValue & 0x2b000000) == 0x2b000000)
|| ((xValue & 0xa000000) == 0xA000000)) {
//Type[] xTypeGenArgs = null;
//Type[] xMethodGenArgs = null;
//if (mMethod.DeclaringType.IsGenericType) {
// xTypeGenArgs = mMethod.DeclaringType.GetGenericArguments();
//}
//if (mMethod.IsGenericMethod) {
// xMethodGenArgs = mMethod.GetGenericArguments();
//}
// http://msdn.microsoft.com/en-us/library/ms145421(VS.85).aspx
//Value = mModule.ResolveMethod(OperandValueInt32, xTypeGenArgs, xMethodGenArgs);
}
xILOpCode = new ILOpCodes.OpMethod(xOpCodeVal, null);
xPos = xPos + 4;
break;
}
// 32-bit metadata signature token.
case OperandType.InlineSig:
//TODO: Complete this section
xILOpCode = new ILOpCodes.OpSig(xOpCodeVal, 0);
xPos = xPos + 4;
break;
// 32-bit metadata string token.
case OperandType.InlineString:
xILOpCode = new ILOpCodes.OpString(xOpCodeVal, aMethod.Module.ResolveString((int)ReadUInt32(xIL, xPos)));
xPos = xPos + 4;
break;
case OperandType.InlineSwitch: {
//TODO: Complete this section
int xCount = (int)ReadUInt32(xIL, xPos);
int[] xBranchLocations = new int[xCount];
uint[] xBranchValues = new uint[xCount];
for (int i = 0; i < xCount; i++) {
xBranchLocations[i] = xIL[xPos + i + 5];
//xBranchValues[i] =
// if ((mPosition + xBranchLocations1[i]) < 0) {
// xResult[i] = (uint)xBranchLocations1[i];
// } else {
// xResult[i] = (uint)(mPosition + xBranchLocations1[i]);
// }
}
xILOpCode = new ILOpCodes.OpSwitch(xOpCodeVal);
xPos = xPos + 4 + xCount * 4;
break;
}
// The operand is a FieldRef, MethodRef, or TypeRef token.
case OperandType.InlineTok:
//TODO: Complete this section
xILOpCode = new ILOpCodes.OpToken(xOpCodeVal, 0);
xPos = xPos + 4;
break;
// 32-bit metadata token.
case OperandType.InlineType: {
//TODO: Complete this section
// Type[] xTypeGenArgs = null;
// Type[] xMethodGenArgs = null;
// if (mMethod.DeclaringType.IsGenericType) {
// xTypeGenArgs = mMethod.DeclaringType.GetGenericArguments();
// }
// if (mMethod.IsGenericMethod) {
// xMethodGenArgs = mMethod.GetGenericArguments();
// }
// mOperandValueType = mModule.ResolveType(OperandValueInt32,
// xTypeGenArgs,
// xMethodGenArgs);
// return mOperandValueType;
xILOpCode = new ILOpCodes.OpType(xOpCodeVal, null);
xPos = xPos + 4;
break;
}
// 8-bit integer containing the ordinal of a local variable or an argument.
case OperandType.ShortInlineVar:
xILOpCode = new ILOpCodes.OpVar(xOpCodeVal, xIL[xPos]);
xPos = xPos + 1;
break;
// 16-bit integer containing the ordinal of a local variable or an argument.
case OperandType.InlineVar:
xILOpCode = new ILOpCodes.OpVar(xOpCodeVal, ReadUInt16(xIL, xPos));
xPos = xPos + 2;
break;
default:
throw new Exception("Unknown OperandType");
}
//TODO: Complete these shortcuts
#region Expand shortcuts
// This region expands shortcut ops into full ops
// This elminates the amount of code required in the assemblers
// by allowing them to ignore the shortcuts
switch (xOpCodeVal) {
case ILOpCode.Code.Beq_S:
//TODO: xILOpCode = new ILOpCodes.xxx(ILOpCode.Code.Beq, xILOpCode.value);
break;
case ILOpCode.Code.Bge_S:
//TODO: return Code.Bge;
break;
case ILOpCode.Code.Bge_Un_S:
//return Code.Bge_Un;
break;
case ILOpCode.Code.Bgt_S:
//TODO: return Code.Bgt;
break;
case ILOpCode.Code.Bgt_Un_S:
//return Code.Bgt_Un;
break;
case ILOpCode.Code.Ble_S:
//TODO: return Code.Ble;
break;
case ILOpCode.Code.Ble_Un_S:
//TODO: return Code.Ble_Un;
break;
case ILOpCode.Code.Blt_S:
//TODO: return Code.Blt;
break;
case ILOpCode.Code.Blt_Un_S:
//TODO: return Code.Blt_Un;
break;
case ILOpCode.Code.Bne_Un_S:
//TODO: return Code.Bne_Un;
break;
case ILOpCode.Code.Br_S:
//TODO: return Code.Br;
break;
case ILOpCode.Code.Brfalse_S:
//TODO: return Code.Brfalse;
break;
case ILOpCode.Code.Brtrue_S:
//TODO: return Code.Brtrue;
break;
case ILOpCode.Code.Ldarg_0:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldarg, 0);
break;
case ILOpCode.Code.Ldarg_1:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldarg, 1);
break;
case ILOpCode.Code.Ldarg_2:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldarg, 2);
break;
case ILOpCode.Code.Ldarg_3:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldarg, 3);
break;
case ILOpCode.Code.Ldarg_S:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldarg, ((ILOpCodes.OpVar)xILOpCode).Value);
break;
case ILOpCode.Code.Ldarga_S:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldarga, ((ILOpCodes.OpVar)xILOpCode).Value);
break;
case ILOpCode.Code.Ldc_I4_0:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 0);
break;
case ILOpCode.Code.Ldc_I4_1:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 1);
break;
case ILOpCode.Code.Ldc_I4_2:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 2);
break;
case ILOpCode.Code.Ldc_I4_3:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 3);
break;
case ILOpCode.Code.Ldc_I4_4:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 4);
break;
case ILOpCode.Code.Ldc_I4_5:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 5);
break;
case ILOpCode.Code.Ldc_I4_6:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 6);
break;
case ILOpCode.Code.Ldc_I4_7:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 7);
break;
case ILOpCode.Code.Ldc_I4_8:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 8);
break;
case ILOpCode.Code.Ldc_I4_M1:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, 0xFFFFFFFF);
break;
case ILOpCode.Code.Ldc_I4_S:
xILOpCode = new ILOpCodes.OpInt(ILOpCode.Code.Ldc_I4, ((ILOpCodes.OpInt)xILOpCode).Value);
break;
case ILOpCode.Code.Ldloc_0:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldloc, 0);
break;
case ILOpCode.Code.Ldloc_1:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldloc, 1);
break;
case ILOpCode.Code.Ldloc_2:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldloc, 2);
break;
case ILOpCode.Code.Ldloc_3:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldloc, 3);
break;
case ILOpCode.Code.Ldloc_S:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldloc, ((ILOpCodes.OpVar)xILOpCode).Value);
break;
case ILOpCode.Code.Ldloca_S:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Ldloca, ((ILOpCodes.OpVar)xILOpCode).Value);
break;
case ILOpCode.Code.Leave_S:
//TODO: return Code.Leave;
break;
case ILOpCode.Code.Starg_S:
//TODO: return Code.Starg;
break;
case ILOpCode.Code.Stloc_0:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Stloc, 0);
break;
case ILOpCode.Code.Stloc_1:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Stloc, 1);
break;
case ILOpCode.Code.Stloc_2:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Stloc, 2);
break;
case ILOpCode.Code.Stloc_3:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Stloc, 3);
break;
case ILOpCode.Code.Stloc_S:
xILOpCode = new ILOpCodes.OpVar(ILOpCode.Code.Stloc, ((ILOpCodes.OpVar)xILOpCode).Value);
break;
}
#endregion
xResult.Add(xILOpCode);
}
return xResult;
}
// We could use BitConvertor, unfortuantely they "hardcoded" endianness. Its fine for reading IL now...
// but they essentially do the same as we do, just a bit slower.
private UInt16 ReadUInt16(byte[] aBytes, int aPos) {
return (UInt16)(aBytes[aPos + 1] << 8 | aBytes[aPos]);
}
private UInt32 ReadUInt32(byte[] aBytes, int aPos) {
return (UInt32)(aBytes[aPos + 3] << 24 | aBytes[aPos + 2] << 16 | aBytes[aPos + 1] << 8 | aBytes[aPos]);
}
private UInt64 ReadUInt64(byte[] aBytes, int aPos) {
return (UInt64)(
aBytes[aPos + 7] << 56 | aBytes[aPos + 6] << 48 | aBytes[aPos + 5] << 40 | aBytes[aPos + 4] << 32
| aBytes[aPos + 3] << 24 | aBytes[aPos + 2] << 16 | aBytes[aPos + 1] << 8 | aBytes[aPos]);
}
}
}
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