private void Emit(CilCodegenInstruction instruction)
{
if (instruction is CilMarkTargetInstruction)
{
pendingTargets.Add(((CilMarkTargetInstruction)instruction).Target);
}
else if (instruction is CilOpInstruction)
{
var opInsn = (CilOpInstruction)instruction;
// Emit the instruction.
Emit(opInsn.Op);
// Add an entry to the patch list if necessary.
if (opInsn.Patch != null)
{
patches.Add(opInsn);
}
}
else if (instruction is CilExceptionHandlerInstruction)
{
var handlerInsn = (CilExceptionHandlerInstruction)instruction;
// Create the actual exception handler.
var handler = new Mono.Cecil.Cil.ExceptionHandler(handlerInsn.Type);
if (handlerInsn.Type == Mono.Cecil.Cil.ExceptionHandlerType.Catch)
{
handler.CatchType = handlerInsn.CatchType;
}
Processor.Body.ExceptionHandlers.Add(handler);
// Emit the try block's contents. Record the last instruction
// prior to the try block. We'll use it to find the first instruction
// inside the try block when we add a handler to the
var preTryInstruction = Processor.Body.Instructions.LastOrDefault();
foreach (var insn in handlerInsn.TryBlock)
{
Emit(insn);
}
// Similarly, record the last instruction of the 'try' block and then
// proceed by emitting the handler block.
var lastTryInstruction = Processor.Body.Instructions.LastOrDefault();
foreach (var insn in handlerInsn.HandlerBlock)
{
Emit(insn);
}
// Populate the exception handler's start/end fields.
handler.TryStart = preTryInstruction == null
? Processor.Body.Instructions.First()
: preTryInstruction.Next;
handler.TryEnd = lastTryInstruction == null
? Processor.Body.Instructions.First()
: lastTryInstruction.Next;
handler.HandlerStart = handler.TryEnd;
handler.HandlerEnd = Processor.Create(OpCodes.Nop);
Processor.Append(handler.HandlerEnd);
}
else if (instruction is CilLoadRegisterInstruction)
{
var loadInsn = (CilLoadRegisterInstruction)instruction;
var reg = RegisterAllocation.GetRegister(loadInsn.Value);
if (reg.IsParameter)
{
Emit(CilInstruction.Create(OpCodes.Ldarg, reg.ParameterOrNull));
}
else
{
IncrementUseCount(reg.VariableOrNull);
Emit(CilInstruction.Create(OpCodes.Ldloc, reg.VariableOrNull));
}
}
else if (instruction is CilAddressOfRegisterInstruction)
{
var addressOfInsn = (CilAddressOfRegisterInstruction)instruction;
var reg = RegisterAllocation.GetRegister(addressOfInsn.Value);
if (reg.IsParameter)
{
Emit(CilInstruction.Create(OpCodes.Ldarga, reg.ParameterOrNull));
}
else
{
IncrementUseCount(reg.VariableOrNull);
Emit(CilInstruction.Create(OpCodes.Ldloca, reg.VariableOrNull));
}
}
else
{
var storeInsn = (CilStoreRegisterInstruction)instruction;
if (RegisterAllocation.Allocation.ContainsKey(storeInsn.Value))
{
var reg = RegisterAllocation.GetRegister(storeInsn.Value);
if (reg.IsParameter)
{
Emit(CilInstruction.Create(OpCodes.Starg, reg.ParameterOrNull));
}
else
{
IncrementUseCount(reg.VariableOrNull);
Emit(CilInstruction.Create(OpCodes.Stloc, reg.VariableOrNull));
}
}
else
{
Emit(CilInstruction.Create(OpCodes.Pop));
}
}
}
private void Emit(CilCodegenInstruction instruction)
{
if (instruction is CilMarkTargetInstruction)
{
pendingTargets.Add(((CilMarkTargetInstruction)instruction).Target);
}
else if (instruction is CilOpInstruction)
{
var opInsn = (CilOpInstruction)instruction;
// Emit the instruction.
Emit(opInsn.Op);
// Add an entry to the patch list if necessary.
if (opInsn.Patch != null)
{
patches.Add(opInsn);
}
}
else if (instruction is CilTryStartMarker)
{
var tag = new BasicBlockTag("try-start");
pendingTargets.Add(tag);
pendingTryHandlers.Push(tag);
}
else if (instruction is CilHandlerStartMarker)
{
var tryStart = pendingTryHandlers.Pop();
var catchStart = new BasicBlockTag("catch-start");
pendingTargets.Add(catchStart);
pendingHandlers.Push(
Tuple.Create(
tryStart,
catchStart,
((CilHandlerStartMarker)instruction).Handler));
}
else if (instruction is CilHandlerEndMarker)
{
var handlerTriple = pendingHandlers.Pop();
var tryStart = handlerTriple.Item1;
var handlerStart = handlerTriple.Item2;
var handler = handlerTriple.Item3;
Processor.Body.ExceptionHandlers.Add(handler);
// Populate the exception handler's start/end fields.
handler.TryStart = branchTargets[tryStart];
handler.TryEnd = branchTargets[handlerStart];
handler.HandlerStart = handler.TryEnd;
handler.HandlerEnd = Processor.Create(OpCodes.Nop);
Processor.Append(handler.HandlerEnd);
}
else if (instruction is CilLoadRegisterInstruction)
{
var loadInsn = (CilLoadRegisterInstruction)instruction;
var reg = RegisterAllocation.GetRegister(loadInsn.Value);
if (reg.IsParameter)
{
Emit(CilInstruction.Create(OpCodes.Ldarg, reg.ParameterOrNull));
}
else
{
IncrementUseCount(reg.VariableOrNull);
Emit(CilInstruction.Create(OpCodes.Ldloc, reg.VariableOrNull));
}
}
else if (instruction is CilAddressOfRegisterInstruction)
{
var addressOfInsn = (CilAddressOfRegisterInstruction)instruction;
var reg = RegisterAllocation.GetRegister(addressOfInsn.Value);
if (reg.IsParameter)
{
Emit(CilInstruction.Create(OpCodes.Ldarga, reg.ParameterOrNull));
}
else
{
IncrementUseCount(reg.VariableOrNull);
Emit(CilInstruction.Create(OpCodes.Ldloca, reg.VariableOrNull));
}
}
else
{
var storeInsn = (CilStoreRegisterInstruction)instruction;
if (RegisterAllocation.Allocation.ContainsKey(storeInsn.Value))
{
var reg = RegisterAllocation.GetRegister(storeInsn.Value);
if (reg.IsParameter)
{
Emit(CilInstruction.Create(OpCodes.Starg, reg.ParameterOrNull));
}
else
{
IncrementUseCount(reg.VariableOrNull);
Emit(CilInstruction.Create(OpCodes.Stloc, reg.VariableOrNull));
}
}
else
{
Emit(CilInstruction.Create(OpCodes.Pop));
}
}
}