internal MatchContext(Instruction instruction)
{
Reset(instruction);
}
private static void AppendLabel(StringBuilder builder, Instruction instruction)
{
builder.Append("IL_");
builder.Append(instruction.Offset.ToString("x4"));
}
internal void Reset(Instruction instruction)
{
Instruction = instruction;
IsMatch = true;
}
private void ResolveBranches()
{
foreach (var instruction in _instructions)
{
var operandType = instruction.OpCode.OperandType;
if (operandType != OperandType.InlineBrTarget)
{
if (operandType == OperandType.InlineSwitch)
{
goto Label_005A;
}
if (operandType != OperandType.ShortInlineBrTarget)
{
continue;
}
}
instruction.Operand = GetInstruction(_instructions, (int) instruction.Operand);
continue;
Label_005A:
var numArray = (int[]) instruction.Operand;
var instructionArray = new Instruction[numArray.Length];
for (var i = 0; i < numArray.Length; i++)
{
instructionArray[i] = GetInstruction(_instructions, numArray[i]);
}
instruction.Operand = instructionArray;
}
}
private void ReadOperand(Instruction instruction)
{
switch (instruction.OpCode.OperandType)
{
case OperandType.InlineBrTarget:
instruction.Operand = _il.ReadInt32() + _il.Position;
return;
case OperandType.InlineField:
case OperandType.InlineMethod:
case OperandType.InlineTok:
case OperandType.InlineType:
instruction.Operand = _module.ResolveMember(_il.ReadInt32(), _typeArguments, _methodArguments);
return;
case OperandType.InlineI:
instruction.Operand = _il.ReadInt32();
return;
case OperandType.InlineI8:
instruction.Operand = _il.ReadInt64();
return;
case OperandType.InlineNone:
return;
case OperandType.InlineR:
instruction.Operand = _il.ReadDouble();
return;
case OperandType.InlineSig:
instruction.Operand = _module.ResolveSignature(_il.ReadInt32());
return;
case OperandType.InlineString:
instruction.Operand = _module.ResolveString(_il.ReadInt32());
return;
case OperandType.InlineSwitch:
{
var num = _il.ReadInt32();
var num2 = _il.Position + (4*num);
var numArray = new int[num];
for (var i = 0; i < num; i++)
{
numArray[i] = _il.ReadInt32() + num2;
}
instruction.Operand = numArray;
return;
}
case OperandType.InlineVar:
instruction.Operand = GetVariable(instruction, _il.ReadInt16());
return;
case OperandType.ShortInlineBrTarget:
instruction.Operand = ((sbyte) _il.ReadByte()) + _il.Position;
return;
case OperandType.ShortInlineI:
if (!(instruction.OpCode == OpCodes.Ldc_I4_S))
{
instruction.Operand = _il.ReadByte();
return;
}
instruction.Operand = (sbyte) _il.ReadByte();
return;
case OperandType.ShortInlineR:
instruction.Operand = _il.ReadSingle();
return;
case OperandType.ShortInlineVar:
instruction.Operand = GetVariable(instruction, _il.ReadByte());
return;
}
throw new NotSupportedException();
}
private void ReadInstructions()
{
Instruction instruction = null;
while (_il.Position < _il.Buffer.Length)
{
var instruction2 = new Instruction(_il.Position, ReadOpCode());
ReadOperand(instruction2);
if (instruction != null)
{
instruction2.Previous = instruction;
instruction.Next = instruction2;
}
_instructions.Add(instruction2);
instruction = instruction2;
}
ResolveBranches();
}
private object GetVariable(Instruction instruction, int index)
{
if (TargetsLocalVariable(instruction.OpCode))
return GetLocalVariable(index);
return GetParameter(index);
}