void WriteExceptionHandlerSpecific(ExceptionHandler handler)
{
switch (handler.HandlerType)
{
case ExceptionHandlerType.Catch:
WriteMetadataToken(metadata.LookupToken(handler.CatchType));
break;
case ExceptionHandlerType.Filter:
WriteInt32(handler.FilterStart.Offset);
break;
default:
WriteInt32(0);
break;
}
}
void ReadExceptionHandlerSpecific(ExceptionHandler handler)
{
switch (handler.HandlerType)
{
case ExceptionHandlerType.Catch:
handler.CatchType = (TypeReference)reader.LookupToken(ReadToken());
break;
case ExceptionHandlerType.Filter:
handler.FilterStart = GetInstruction(ReadInt32());
break;
default:
Advance(4);
break;
}
}
private static MethodBody CloneMethodBody(MethodBody body, MethodDefinition source, MethodDefinition target)
{
var context = target.DeclaringType.Module;
var nb = new MethodBody(target)
{
MaxStackSize = body.MaxStackSize,
InitLocals = body.InitLocals,
CodeSize = body.CodeSize
};
var worker = nb.GetILProcessor();
foreach (var var in body.Variables)
nb.Variables.Add(new VariableDefinition(
var.Name, FixTypeImport(context, source, target, var.VariableType)));
foreach (var instr in body.Instructions)
{
var ni = new Instruction(instr.OpCode, OpCodes.Nop);
switch (instr.OpCode.OperandType)
{
case OperandType.InlineArg:
case OperandType.ShortInlineArg:
if (instr.Operand == body.ThisParameter)
ni.Operand = nb.ThisParameter;
else
{
var param = body.Method.Parameters.IndexOf((ParameterDefinition)instr.Operand);
ni.Operand = target.Parameters[param];
}
break;
case OperandType.InlineVar:
case OperandType.ShortInlineVar:
var var = body.Variables.IndexOf((VariableDefinition)instr.Operand);
ni.Operand = nb.Variables[var];
break;
case OperandType.InlineField:
ni.Operand = FixFieldImport(context, source, target, (FieldReference)instr.Operand);
break;
case OperandType.InlineMethod:
ni.Operand = FixMethodImport(context, source, target, (MethodReference)instr.Operand);
break;
case OperandType.InlineType:
ni.Operand = FixTypeImport(context, source, target, (TypeReference)instr.Operand);
break;
case OperandType.InlineTok:
if ((instr.Operand) is TypeReference)
ni.Operand = FixTypeImport(context, source, target, (TypeReference)instr.Operand);
else if ((instr.Operand) is FieldReference)
ni.Operand = FixFieldImport(context, source, target, (FieldReference)instr.Operand);
else if ((instr.Operand) is MethodReference)
ni.Operand = FixMethodImport(context, source, target, (MethodReference)instr.Operand);
break;
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
case OperandType.InlineSwitch:
break;
default:
ni.Operand = instr.Operand;
break;
}
worker.Append(ni);
}
for (var i = 0; i < body.Instructions.Count; i++)
{
var instr = nb.Instructions[i];
var oldi = body.Instructions[i];
switch (instr.OpCode.OperandType)
{
case OperandType.InlineSwitch:
{
var olds = (Instruction[])oldi.Operand;
var targets = new Instruction[olds.Length];
for (var j = 0; j < targets.Length; j++)
targets[j] = GetInstruction(body, nb, olds[j]);
instr.Operand = targets;
}
break;
case OperandType.InlineBrTarget:
case OperandType.ShortInlineBrTarget:
instr.Operand = GetInstruction(body, nb, (Instruction)oldi.Operand);
break;
}
}
foreach (var eh in body.ExceptionHandlers)
{
var neh = new ExceptionHandler(eh.HandlerType)
{
TryStart = GetInstruction(body, nb, eh.TryStart),
TryEnd = GetInstruction(body, nb, eh.TryEnd),
HandlerStart = GetInstruction(body, nb, eh.HandlerStart),
HandlerEnd = GetInstruction(body, nb, eh.HandlerEnd)
};
switch (eh.HandlerType)
{
case ExceptionHandlerType.Catch:
neh.CatchType = FixTypeImport(context, source, target, eh.CatchType);
break;
case ExceptionHandlerType.Filter:
neh.FilterStart = GetInstruction(body, nb, eh.FilterStart);
break;
}
nb.ExceptionHandlers.Add(neh);
}
return nb;
}
// inline ?
void ReadExceptionHandlers(int count, Func<int> read_entry, Func<int> read_length)
{
for (int i = 0; i < count; i++)
{
var handler = new ExceptionHandler(
(ExceptionHandlerType)(read_entry() & 0x7));
handler.TryStart = GetInstruction(read_entry());
handler.TryEnd = GetInstruction(handler.TryStart.Offset + read_length());
handler.HandlerStart = GetInstruction(read_entry());
handler.HandlerEnd = GetInstruction(handler.HandlerStart.Offset + read_length());
ReadExceptionHandlerSpecific(handler);
this.body.ExceptionHandlers.Add(handler);
}
}
