IEnumerable <Instruction> GetAttributeInstanceInstructions(
ILProcessor processor,
ICustomAttribute attribute,
MethodDefinition method,
VariableDefinition attributeVariableDefinition,
VariableDefinition methodVariableDefinition,
bool explicitMatch)
{
var getMethodFromHandleRef = referenceFinder.GetMethodReference(methodBaseTypeRef, md => md.Name == "GetMethodFromHandle" &&
md.Parameters.Count == 2);
var getTypeof = referenceFinder.GetMethodReference(systemTypeRef, md => md.Name == "GetTypeFromHandle");
var ctor = referenceFinder.GetMethodReference(activatorTypeRef, md => md.Name == "CreateInstance" &&
md.Parameters.Count == 1);
var getCustomAttrs = referenceFinder.GetMethodReference(attributeTypeRef,
md => md.Name == "GetCustomAttributes" &&
md.Parameters.Count == 2 &&
md.Parameters[0].ParameterType.FullName == typeof(MemberInfo).FullName &&
md.Parameters[1].ParameterType.FullName == typeof(Type).FullName);
/*
* // Code size 23 (0x17)
* .maxstack 1
* .locals init ([0] class SimpleTest.IntersectMethodsMarkedByAttribute i)
* IL_0000: nop
* IL_0001: ldtoken SimpleTest.IntersectMethodsMarkedByAttribute
* IL_0006: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)
* IL_000b: call object [mscorlib]System.Activator::CreateInstance(class [mscorlib]System.Type)
* IL_0010: castclass SimpleTest.IntersectMethodsMarkedByAttribute
* IL_0015: stloc.0
* IL_0016: ret
*/
var oInstructions = new List <Instruction>
{
processor.Create(OpCodes.Nop),
processor.Create(OpCodes.Ldtoken, method),
processor.Create(OpCodes.Ldtoken, method.DeclaringType),
processor.Create(OpCodes.Call, getMethodFromHandleRef), // Push method onto the stack, GetMethodFromHandle, result on stack
processor.Create(OpCodes.Stloc, methodVariableDefinition), // Store method in __fody$method
processor.Create(OpCodes.Nop),
};
if (explicitMatch &&
method.CustomAttributes.Any(m => m.AttributeType.Equals(attribute.AttributeType)))
{
oInstructions.AddRange(new[]
{
processor.Create(OpCodes.Ldloc, methodVariableDefinition),
processor.Create(OpCodes.Ldtoken, attribute.AttributeType),
processor.Create(OpCodes.Call, getTypeof),
processor.Create(OpCodes.Call, getCustomAttrs),
processor.Create(OpCodes.Dup),
processor.Create(OpCodes.Ldlen),
processor.Create(OpCodes.Ldc_I4_1),
processor.Create(OpCodes.Sub),
// processor.Create(OpCodes.Ldc_I4_0),
processor.Create(OpCodes.Ldelem_Ref),
processor.Create(OpCodes.Castclass, attribute.AttributeType),
processor.Create(OpCodes.Stloc, attributeVariableDefinition),
});
}
else if (explicitMatch &&
method.DeclaringType.CustomAttributes.Any(m => m.AttributeType.Equals(attribute.AttributeType)))
{
oInstructions.AddRange(new[]
{
processor.Create(OpCodes.Ldtoken, method.DeclaringType),
processor.Create(OpCodes.Call, getTypeof),
processor.Create(OpCodes.Ldtoken, attribute.AttributeType),
processor.Create(OpCodes.Call, getTypeof),
processor.Create(OpCodes.Call, getCustomAttrs),
processor.Create(OpCodes.Dup),
processor.Create(OpCodes.Ldlen),
processor.Create(OpCodes.Ldc_I4_1),
processor.Create(OpCodes.Sub),
processor.Create(OpCodes.Ldelem_Ref),
processor.Create(OpCodes.Castclass, attribute.AttributeType),
processor.Create(OpCodes.Stloc, attributeVariableDefinition),
});
}
else
{
oInstructions.AddRange(new[]
{
processor.Create(OpCodes.Ldtoken, attribute.AttributeType),
processor.Create(OpCodes.Call, getTypeof),
processor.Create(OpCodes.Call, ctor),
processor.Create(OpCodes.Castclass, attribute.AttributeType),
processor.Create(OpCodes.Stloc, attributeVariableDefinition),
});
}
return(oInstructions);
}