private void InsertActivateCall(MethodEditor cil, Instruction insertionPoint, ActivationPurpose activationPurpose)
{
Instruction previous = insertionPoint.Previous;
if (previous.OpCode == OpCodes.Ldarg)
{
Instruction newLoadInstruction = cil.Create(previous.OpCode, (ParameterDefinition)previous.Operand);
InsertActivateCall(cil,
previous,
newLoadInstruction,
activationPurpose);
}
else
{
InsertActivateCall(cil,
insertionPoint,
cil.Create(OpCodes.Dup),
activationPurpose);
}
}
private void InsertActivateCall(MethodEditor cil, Instruction insertionPoint, Instruction loadReferenceInstruction, ActivationPurpose activationPurpose)
{
cil.InsertBefore(insertionPoint, loadReferenceInstruction);
cil.InsertBefore(insertionPoint, cil.Create(OpCodes.Ldc_I4, (int)activationPurpose));
cil.InsertBefore(insertionPoint, cil.Create(OpCodes.Callvirt, ActivateMethodRef()));
}
private void ProcessFieldGetter(Instruction instruction, MethodEditor cil)
{
Instruction insertionPoint = GetInsertionPoint(instruction);
InsertActivateCall(cil, insertionPoint, ActivationPurpose.Read);
}
private static VariableDefinition SaveStackTop(MethodEditor cil, Instruction instruction)
{
VariableDefinition oldStackTop = cil.AddVariable(Resolve(instruction).FieldType);
cil.InsertBefore(GetInsertionPoint(instruction), cil.Create(OpCodes.Stloc, oldStackTop));
return oldStackTop;
}
private void ProcessFieldSetter(Instruction instruction, MethodEditor cil)
{
VariableDefinition oldStackTop = SaveStackTop(cil, instruction);
Instruction insertionPoint = GetInsertionPoint(instruction);
InsertActivateCall(cil, insertionPoint, ActivationPurpose.Write);
cil.InsertBefore(insertionPoint, cil.Create(OpCodes.Ldloc, oldStackTop));
}
private void ProcessFieldAccess(MethodEditor cil, Instruction instruction)
{
if (IsFieldGetter(instruction))
{
ProcessFieldGetter(instruction, cil);
}
else
{
ProcessFieldSetter(instruction, cil);
}
}
private void InstrumentFieldAccesses(MethodDefinition method)
{
MethodEditor editor = new MethodEditor(method);
foreach (Instruction instruction in FieldAccesses(method.Body))
{
ProcessFieldAccess(editor, instruction);
}
}