/// <summary>
/// Compute delta of pushing according to given instruction
/// <remarks>Modified method taken from http://cecil.googlecode.com/svn/trunk/decompiler/Cecil.Decompiler/Cecil.Decompiler.Cil/ControlFlowGraphBuilder.cs </remarks>.
/// </summary>
/// <param name="instruction">Instruction which delta is computed.</param>
/// <returns>Push delta.</returns>
int getPushDelta(CILInstruction instruction)
{
var stackBehaviour = instruction.OpCode.StackBehaviourPush;
switch (stackBehaviour)
{
case StackBehaviour.Push0:
return(0);
case StackBehaviour.Push1:
case StackBehaviour.Pushi:
case StackBehaviour.Pushi8:
case StackBehaviour.Pushr4:
case StackBehaviour.Pushr8:
case StackBehaviour.Pushref:
return(1);
case StackBehaviour.Push1_push1:
return(2);
case StackBehaviour.Varpush:
if (instruction.MethodOperand == null)
{
//cannot be determined
return(0);
}
return(instruction.MethodOperand.ReturnType.TypeName == typeof(void).FullName ? 0 : 1);
default:
//unknown behaviour
return(0);
}
}
/// <summary>
/// Transcript given instructions in context of given method.
/// Transcription is processed by given emitter.
/// </summary>
/// <param name="method">Context method of transcription</param>
/// <param name="instructions">Transcripted instructions</param>
/// <param name="emitter">Emitter where transcription is emitted</param>
internal static void Transcript(TypeMethodInfo method, IEnumerable <CILInstruction> instructions, EmitterBase emitter)
{
E = emitter;
Method = method;
LocalTmpVar = E.GetTemporaryVariable("local");
//prepare labels table
Labels.Clear();
foreach (var instruction in instructions)
{
var labelName = string.Format("L_0x{0:x4}", instruction.Address);
Labels.Add(instruction.Address, E.CreateLabel(labelName));
}
foreach (var instruction in instructions)
{
Instruction = instruction;
E.SetLabel(Labels[instruction.Address]);
var block = E.StartNewInfoBlock();
block.Comment = "\n---" + Instruction.ToString();
Action transcriptor;
if (_transcriptors.TryGetValue(Name, out transcriptor))
{
transcriptor();
}
else
{
unknownInstruction();
}
}
}
/// <summary>
/// Compute delta of popping according to given instruction
/// <remarks>Modified method taken from http://cecil.googlecode.com/svn/trunk/decompiler/Cecil.Decompiler/Cecil.Decompiler.Cil/ControlFlowGraphBuilder.cs </remarks>.
/// </summary>
/// <param name="instruction">Instruction which delta is computed.</param>
/// <param name="stackHeight">Current height of stack that should be popped.</param>
/// <returns>Pop delta.</returns>
int getPopDelta(CILInstruction instruction, int stackHeight)
{
var stackBehaviour = instruction.OpCode.StackBehaviourPop;
switch (stackBehaviour)
{
case StackBehaviour.Pop0:
return(0);
case StackBehaviour.Popi:
case StackBehaviour.Popref:
case StackBehaviour.Pop1:
return(1);
case StackBehaviour.Pop1_pop1:
case StackBehaviour.Popi_pop1:
case StackBehaviour.Popi_popi:
case StackBehaviour.Popi_popi8:
case StackBehaviour.Popi_popr4:
case StackBehaviour.Popi_popr8:
case StackBehaviour.Popref_pop1:
case StackBehaviour.Popref_popi:
return(2);
case StackBehaviour.Popi_popi_popi:
case StackBehaviour.Popref_popi_popi:
case StackBehaviour.Popref_popi_popi8:
case StackBehaviour.Popref_popi_popr4:
case StackBehaviour.Popref_popi_popr8:
case StackBehaviour.Popref_popi_popref:
return(3);
case StackBehaviour.PopAll:
return(stackHeight);
case StackBehaviour.Varpop:
if (instruction.MethodOperand != null)
{
var method = instruction.MethodOperand;
int count = method.Parameters.Length;
if (method.HasThis && OpCodes.Newobj.Value != instruction.OpCode.Value)
{
++count;
}
return(count);
}
//if (instruction.OpCode.Code == Code.Ret)
//return IsVoidMethod() ? 0 : 1;
return(0); //we dont now if we are in void method
}
return(0);
}
