/// <summary>
/// Need to do this so we retain pointer from original first instruction to new first instruction (nop)
/// for dbg file to point to it so VS debugger will step into weaved methods
/// </summary>
/// <param name="ilProcessor"></param>
/// <param name="firstInstruction"></param>
/// <returns></returns>
private static Instruction RejigFirstInstruction(ILProcessor ilProcessor, Instruction firstInstruction)
{
/*
From:
opcode operand <-- pdb first line pointer
To:
nop <-- pdb first line pointer
opcode operand <-- cloned second acting as first
*/
// clone first instruction which will be used as actual
var clonedSecond = CloneInstruction(firstInstruction);
clonedSecond.Offset++;
var sampleNop = ilProcessor.Create(OpCodes.Nop);
// change actual first instruction to NOP
firstInstruction.OpCode = sampleNop.OpCode;
firstInstruction.Operand = sampleNop.Operand;
// append second instruction which now is same as first one used to be at the start of this method
// and actual first one is nop
firstInstruction.Append(clonedSecond, ilProcessor);
// return cloned second as new first instruction
return clonedSecond;
}
