public void Replace(MSILInstruction targetInstruction, MSILInstruction newInstruction, bool overwriteWhenLarger, bool suppressInvalidReferences)
{
int targetOffset = (int)(_bodyOffset + targetInstruction.Offset);
if(!overwriteWhenLarger && targetInstruction.Size < newInstruction.Size)
throw new ArgumentException("The size of the new instruction is bigger than the target instruction.", "newInstruction");
newInstruction.Offset = targetInstruction.Offset;
GenerateOperandBytes(newInstruction);
if (!suppressInvalidReferences && newInstruction.Operand is MetaDataMember)
{
if (!ValidateReference(newInstruction.Operand as MetaDataMember))
throw new ArgumentException(newInstruction.Operand.ToString() + " does not match with the metadata member provided in the target assembly", "newInstruction");
}
int totalSize = CalculateSpaceNeeded(targetInstruction, newInstruction);
int NopsToAdd = totalSize - newInstruction.Size;
byte[] NOPS = new byte[NopsToAdd];
_image.SetOffset(targetOffset);
_image.Writer.Write(newInstruction.OpCode.Bytes);
if (newInstruction.OperandBytes != null)
_image.Writer.Write(newInstruction.OperandBytes);
_image.Writer.Write(NOPS);
}
public void Replace(MSILInstruction targetInstruction, MSILInstruction newInstruction, bool overwriteWhenLarger, bool suppressInvalidReferences)
{
int targetOffset = (int)(_bodyOffset + targetInstruction.Offset);
if (!overwriteWhenLarger && targetInstruction.Size < newInstruction.Size)
{
throw new ArgumentException("The size of the new instruction is bigger than the target instruction.", "newInstruction");
}
newInstruction.Offset = targetInstruction.Offset;
GenerateOperandBytes(newInstruction);
if (!suppressInvalidReferences && newInstruction.Operand is MetaDataMember)
{
if (!ValidateReference(newInstruction.Operand as MetaDataMember))
{
throw new ArgumentException(newInstruction.Operand.ToString() + " does not match with the metadata member provided in the target assembly", "newInstruction");
}
}
int totalSize = CalculateSpaceNeeded(targetInstruction, newInstruction);
int NopsToAdd = totalSize - newInstruction.Size;
byte[] NOPS = new byte[NopsToAdd];
_image.SetOffset(targetOffset);
_image.Writer.Write(newInstruction.OpCode.Bytes);
if (newInstruction.OperandBytes != null)
{
_image.Writer.Write(newInstruction.OperandBytes);
}
_image.Writer.Write(NOPS);
}
public static MSILInstruction Create(MSILOpCode opcode, object operand)
{
MSILInstruction instruction = new MSILInstruction()
{
OpCode = opcode,
Operand = operand,
};
return(instruction);
}
private void SetBranchTargets(List <MSILInstruction> instructions)
{
for (int i = 0; i < instructions.Count; i++)
{
MSILInstruction instruction = instructions[i];
if (instruction.OpCode.OperandType == OperandType.InstructionTarget || instruction.OpCode.OperandType == OperandType.ShortInstructionTarget)
{
int targetOffset = (int)instruction.Operand;
MSILInstruction targetInstruction = instructions.FirstOrDefault(t => t.Offset == targetOffset);
if (targetInstruction != null)
{
instructions[i].Operand = targetInstruction;
}
}
}
}
public int CalculateSpaceNeeded(MSILInstruction targetInstruction, int newSize)
{
if (newSize <= targetInstruction.Size)
return targetInstruction.Size;
int sizeNeeded = 0;
int currentOffset = targetInstruction.Offset;
while (sizeNeeded < newSize)
{
_disassembler.CurrentOffset = currentOffset;
MSILInstruction currentInstruction = _disassembler.DisassembleNextInstruction();
sizeNeeded += currentInstruction.Size;
currentOffset += currentInstruction.Size;
}
return sizeNeeded;
}
public MSILInstruction[] Disassemble(int startoffset, int length)
{
List <MSILInstruction> instructions = new List <MSILInstruction>();
_reader.BaseStream.Position = _ilOffset + startoffset;
int currentOffset = 0;
while (_reader.BaseStream.Position < _ilOffset + startoffset + length)
{
MSILInstruction instruction = DisassembleNextInstruction();
instructions.Add(instruction);
currentOffset += instruction.Size;
_reader.BaseStream.Position = _ilOffset + startoffset + currentOffset;
}
SetEnclosingInstructions(instructions);
SetBranchTargets(instructions);
return(instructions.ToArray());
}
public int CalculateSpaceNeeded(MSILInstruction targetInstruction, int newSize)
{
if (newSize <= targetInstruction.Size)
{
return(targetInstruction.Size);
}
int sizeNeeded = 0;
int currentOffset = targetInstruction.Offset;
while (sizeNeeded < newSize)
{
_disassembler.CurrentOffset = currentOffset;
MSILInstruction currentInstruction = _disassembler.DisassembleNextInstruction();
sizeNeeded += currentInstruction.Size;
currentOffset += currentInstruction.Size;
}
return(sizeNeeded);
}
public void Replace(MSILInstruction targetInstruction, MSILInstruction newInstruction, bool overwriteWhenLarger)
{
Replace(targetInstruction, newInstruction, overwriteWhenLarger, false);
}
public void Replace(MSILInstruction targetInstruction, MSILInstruction newInstruction)
{
Replace(targetInstruction, newInstruction, false, false);
}
public int CalculateSpaceNeeded(MSILInstruction targetInstruction, MSILInstruction newInstruction)
{
return CalculateSpaceNeeded(targetInstruction, newInstruction.Size);
}
internal void GenerateOperandBytes(MSILInstruction instruction)
{
if (instruction.OperandBytes == null)
{
switch (instruction.OpCode.OperandType)
{
case OperandType.Argument:
if (instruction.Operand is ParameterDefinition)
instruction.OperandBytes = BitConverter.GetBytes((instruction.Operand as ParameterDefinition).Sequence);
break;
case OperandType.ShortArgument:
if (instruction.Operand is ParameterDefinition)
instruction.OperandBytes = BitConverter.GetBytes((byte)(instruction.Operand as ParameterDefinition).Sequence);
break;
case OperandType.Variable:
if (instruction.Operand is VariableDefinition)
instruction.OperandBytes = BitConverter.GetBytes((ushort)(instruction.Operand as VariableDefinition).Index);
break;
case OperandType.ShortVariable:
if (instruction.Operand is VariableDefinition)
instruction.OperandBytes = BitConverter.GetBytes((byte)(instruction.Operand as VariableDefinition).Index);
break;
case OperandType.Field:
case OperandType.Token:
case OperandType.Method:
case OperandType.Type:
// TODO: importing metadata Members into tablesheap
if (instruction.Operand is MetaDataMember)
instruction.OperandBytes = BitConverter.GetBytes((instruction.Operand as MetaDataMember)._metadatatoken);
break;
case OperandType.Float32:
if (instruction.Operand is float)
instruction.OperandBytes = BitConverter.GetBytes((float)instruction.Operand);
break;
case OperandType.Float64:
if (instruction.Operand is double)
instruction.OperandBytes = BitConverter.GetBytes((double)instruction.Operand);
break;
case OperandType.Int8:
if (instruction.Operand is sbyte)
instruction.OperandBytes = new byte[] { byte.Parse(((byte)instruction.Operand).ToString("x2"), System.Globalization.NumberStyles.HexNumber) };
break;
case OperandType.Signature:
case OperandType.Int32:
if (instruction.Operand is int)
instruction.OperandBytes = BitConverter.GetBytes((int)instruction.Operand);
break;
case OperandType.Int64:
if (instruction.Operand is long)
instruction.OperandBytes = BitConverter.GetBytes((long)instruction.Operand);
break;
case OperandType.InstructionTarget:
//BitConverter.ToInt32(rawoperand,0) + instructionOffset + opcode.Bytes.Length + sizeof(int);
if (instruction.Operand is MSILInstruction)
instruction.OperandBytes = BitConverter.GetBytes((instruction.Operand as MSILInstruction).Offset - sizeof(int) - instruction.OpCode.Bytes.Length - instruction.Offset);
break;
case OperandType.ShortInstructionTarget:
if (instruction.Operand is MSILInstruction)
instruction.OperandBytes = new byte[] { byte.Parse(((sbyte)((instruction.Operand as MSILInstruction).Offset - sizeof(sbyte) - instruction.OpCode.Bytes.Length - instruction.Offset)).ToString("x2"), System.Globalization.NumberStyles.HexNumber) };
break;
case OperandType.String:
//TODO: importing strings into stringsheap
case OperandType.Phi:
case OperandType.InstructionTable:
throw new NotSupportedException();
}
if (instruction.OperandBytes == null && instruction.Operand != null)
throw new ArgumentException("Operand must match with the opcode's operand type (" + instruction.OpCode.OperandType.ToString() + ")");
}
}
public int CalculateSpaceNeeded(MSILInstruction targetInstruction, MSILInstruction newInstruction)
{
return(CalculateSpaceNeeded(targetInstruction, newInstruction.Size));
}
public void Replace(MSILInstruction targetInstruction, MSILInstruction newInstruction, bool overwriteWhenLarger)
{
Replace(targetInstruction, newInstruction, overwriteWhenLarger, false);
}
public void Replace(MSILInstruction targetInstruction, MSILInstruction newInstruction)
{
Replace(targetInstruction, newInstruction, false, false);
}
internal void GenerateOperandBytes(MSILInstruction instruction)
{
if (instruction.OperandBytes == null)
{
switch (instruction.OpCode.OperandType)
{
case OperandType.Argument:
if (instruction.Operand is ParameterDefinition)
{
instruction.OperandBytes = BitConverter.GetBytes((instruction.Operand as ParameterDefinition).Sequence);
}
break;
case OperandType.ShortArgument:
if (instruction.Operand is ParameterDefinition)
{
instruction.OperandBytes = BitConverter.GetBytes((byte)(instruction.Operand as ParameterDefinition).Sequence);
}
break;
case OperandType.Variable:
if (instruction.Operand is VariableDefinition)
{
instruction.OperandBytes = BitConverter.GetBytes((ushort)(instruction.Operand as VariableDefinition).Index);
}
break;
case OperandType.ShortVariable:
if (instruction.Operand is VariableDefinition)
{
instruction.OperandBytes = BitConverter.GetBytes((byte)(instruction.Operand as VariableDefinition).Index);
}
break;
case OperandType.Field:
case OperandType.Token:
case OperandType.Method:
case OperandType.Type:
// TODO: importing metadata Members into tablesheap
if (instruction.Operand is MetaDataMember)
{
instruction.OperandBytes = BitConverter.GetBytes((instruction.Operand as MetaDataMember)._metadatatoken);
}
break;
case OperandType.Float32:
if (instruction.Operand is float)
{
instruction.OperandBytes = BitConverter.GetBytes((float)instruction.Operand);
}
break;
case OperandType.Float64:
if (instruction.Operand is double)
{
instruction.OperandBytes = BitConverter.GetBytes((double)instruction.Operand);
}
break;
case OperandType.Int8:
if (instruction.Operand is sbyte)
{
instruction.OperandBytes = new byte[] { byte.Parse(((byte)instruction.Operand).ToString("x2"), System.Globalization.NumberStyles.HexNumber) }
}
;
break;
case OperandType.Signature:
case OperandType.Int32:
if (instruction.Operand is int)
{
instruction.OperandBytes = BitConverter.GetBytes((int)instruction.Operand);
}
break;
case OperandType.Int64:
if (instruction.Operand is long)
{
instruction.OperandBytes = BitConverter.GetBytes((long)instruction.Operand);
}
break;
case OperandType.InstructionTarget:
//BitConverter.ToInt32(rawoperand,0) + instructionOffset + opcode.Bytes.Length + sizeof(int);
if (instruction.Operand is MSILInstruction)
{
instruction.OperandBytes = BitConverter.GetBytes((instruction.Operand as MSILInstruction).Offset - sizeof(int) - instruction.OpCode.Bytes.Length - instruction.Offset);
}
break;
case OperandType.ShortInstructionTarget:
if (instruction.Operand is MSILInstruction)
{
instruction.OperandBytes = new byte[] { byte.Parse(((sbyte)((instruction.Operand as MSILInstruction).Offset - sizeof(sbyte) - instruction.OpCode.Bytes.Length - instruction.Offset)).ToString("x2"), System.Globalization.NumberStyles.HexNumber) }
}
;
break;
case OperandType.String:
//TODO: importing strings into stringsheap
case OperandType.Phi:
case OperandType.InstructionTable:
throw new NotSupportedException();
}
if (instruction.OperandBytes == null && instruction.Operand != null)
{
throw new ArgumentException("Operand must match with the opcode's operand type (" + instruction.OpCode.OperandType.ToString() + ")");
}
}
}
public static MSILInstruction Create(MSILOpCode opcode, object operand)
{
MSILInstruction instruction = new MSILInstruction()
{
OpCode = opcode,
Operand = operand,
};
return instruction;
}