/// <summary>
/// Gets the instructions that generate the arguments for the call in the given instructions.
/// </summary>
public static Instruction[] GetCallArguments(this Instruction call, ILSequence sequence, bool includeThis)
{
var method = (MethodReference)call.Operand;
var count = method.Parameters.Count;
if (includeThis && method.HasThis)
{
count++;
}
var result = new Instruction[count];
var current = call;
var height = count;
for (int i = count - 1; i >= 0; i--)
{
// Look for the starting instruction where stack height is i
while (result[i] == null)
{
var prevIndex = sequence.IndexOf(current);
var prev = (prevIndex >= 1) ? sequence[prevIndex - 1] : null;
if (prev == null)
{
throw new ArgumentException(string.Format("Cannot find arguments for call to {0}", method));
}
height -= prev.GetPushDelta();
if (height == i)
{
result[i] = prev;
}
height += prev.GetPopDelta(0, true);
current = prev;
}
}
return(result);
}
/// <summary>
/// Insert this sequence just after the given instruction in of the given target collection.
/// </summary>
public void InsertToAfter(Instruction prev, ILSequence target)
{
InsertTo(target.IndexOf(prev) + 1, target);
}
/// <summary>
/// Insert this sequence to at the given index of the given target collection.
/// </summary>
public void InsertTo(int index, ILSequence target)
{
target.instructions.InsertRange(index, instructions);
}
/// <summary>
/// Insert this sequence just before the given instruction in of the given target collection.
/// </summary>
public void InsertToBefore(Instruction next, ILSequence target)
{
InsertTo(target.IndexOf(next), target);
}
/// <summary>
/// Add this sequence to the end of the given target collection.
/// </summary>
public void AppendTo(ILSequence target)
{
target.instructions.AddRange(instructions);
}
