internal void FinalizeILCodes(List <MethodInfo> transpilers, List <Label> endLabels, List <ExceptionBlock> endBlocks)
{
if (generator == null)
{
return;
}
// pass1 - define labels and add them to instructions that are target of a jump
//
foreach (var ilInstruction in ilInstructions)
{
switch (ilInstruction.opcode.OperandType)
{
case OperandType.InlineSwitch:
{
var targets = ilInstruction.operand as ILInstruction[];
if (targets != null)
{
var labels = new List <Label>();
foreach (var target in targets)
{
var label = generator.DefineLabel();
target.labels.Add(label);
labels.Add(label);
}
ilInstruction.argument = labels.ToArray();
}
break;
}
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
{
var target = ilInstruction.operand as ILInstruction;
if (target != null)
{
var label = generator.DefineLabel();
target.labels.Add(label);
ilInstruction.argument = label;
}
break;
}
}
}
// pass2 - filter through all processors
//
var codeTranspiler = new CodeTranspiler(ilInstructions);
transpilers.Do(transpiler => codeTranspiler.Add(transpiler));
var codeInstructions = codeTranspiler.GetResult(generator, method);
if (HarmonyInstance.DEBUG)
{
Emitter.LogComment(generator, "start original");
}
// pass3 - log out all new local variables
//
var savedLog = FileLog.GetBuffer(true);
Emitter.AllLocalVariables(generator).Do(local => Emitter.LogLocalVariable(generator, local));
FileLog.LogBuffered(savedLog);
// pass4 - remove RET if it appears at the end
//
while (true)
{
var lastInstruction = codeInstructions.LastOrDefault();
if (lastInstruction == null || lastInstruction.opcode != OpCodes.Ret)
{
break;
}
// remember any existing labels
endLabels.AddRange(lastInstruction.labels);
codeInstructions.RemoveAt(codeInstructions.Count - 1);
}
// pass5 - mark labels and exceptions and emit codes
//
var idx = 0;
codeInstructions.Do(codeInstruction =>
{
// mark all labels
codeInstruction.labels.Do(label => Emitter.MarkLabel(generator, label));
// start all exception blocks
// TODO: we ignore the resulting label because we have no way to use it
//
codeInstruction.blocks.Do(block => {
Label?label;
Emitter.MarkBlockBefore(generator, block, out label);
});
var code = codeInstruction.opcode;
var operand = codeInstruction.operand;
// replace RET with a jump to the end (outside this code)
if (code == OpCodes.Ret)
{
var endLabel = generator.DefineLabel();
code = OpCodes.Br;
operand = endLabel;
endLabels.Add(endLabel);
}
// replace short jumps with long ones (can be optimized but requires byte counting, not instruction counting)
if (shortJumps.TryGetValue(code, out var longJump))
{
code = longJump;
}
var emitCode = true;
//if (code == OpCodes.Leave || code == OpCodes.Leave_S)
//{
// // skip LEAVE on EndExceptionBlock
// if (codeInstruction.blocks.Any(block => block.blockType == ExceptionBlockType.EndExceptionBlock))
// emitCode = false;
// // skip LEAVE on next instruction starts a new exception handler and we are already in
// if (idx < instructions.Length - 1)
// if (instructions[idx + 1].blocks.Any(block => block.blockType != ExceptionBlockType.EndExceptionBlock))
// emitCode = false;
//}
if (emitCode)
{
switch (code.OperandType)
{
case OperandType.InlineNone:
Emitter.Emit(generator, code);
break;
case OperandType.InlineSig:
// TODO the following will fail because we do not convert the token (operand)
// All the decompilers can show the arguments correctly, we just need to find out how
//
if (operand == null)
{
throw new Exception("Wrong null argument: " + codeInstruction);
}
if ((operand is int) == false)
{
throw new Exception("Wrong Emit argument type " + operand.GetType() + " in " + codeInstruction);
}
Emitter.Emit(generator, code, (int)operand);
/*
* // the following will only work if we can convert the original signature token to the required arguments
* //
* var callingConvention = System.Runtime.InteropServices.CallingConvention.ThisCall;
* var returnType = typeof(object);
* var parameterTypes = new[] { typeof(object) };
* Emitter.EmitCalli(generator, code, callingConvention, returnType, parameterTypes);
*
* var callingConventions = System.Reflection.CallingConventions.Standard;
* var optionalParameterTypes = new[] { typeof(object) };
* Emitter.EmitCalli(generator, code, callingConventions, returnType, parameterTypes, optionalParameterTypes);
*/
break;
default:
if (operand == null)
{
throw new Exception("Wrong null argument: " + codeInstruction);
}
var emitMethod = EmitMethodForType(operand.GetType());
if (emitMethod == null)
{
throw new Exception("Unknown Emit argument type " + operand.GetType() + " in " + codeInstruction);
}
if (HarmonyInstance.DEBUG)
{
FileLog.LogBuffered(Emitter.CodePos(generator) + code + " " + Emitter.FormatArgument(operand));
}
emitMethod.Invoke(generator, new object[] { code, operand });
break;
}
}
codeInstruction.blocks.Do(block => Emitter.MarkBlockAfter(generator, block));
idx++;
});
if (HarmonyInstance.DEBUG)
{
Emitter.LogComment(generator, "end original");
}
}