private static void InjectParameterInputCheck(ParameterDefinition parameter, MethodDefinition method, ModuleReferences moduleReferences)
{
var instructions = method.Body.Instructions;
var instruction0 = instructions[0];
int index = 0;
instructions.Insert(index++, Instruction.Create(OpCodes.Ldarg, parameter));
ILHelpers.InsertGetValueRef(ref index, instructions, parameter.ParameterType);
ILHelpers.InsertThrowHelperCallIfValueRefIsNull(
ref index, instructions, moduleReferences.ThrowArgumentNullMethod, parameter.Name, instruction0);
}
private static void InjectReturnValueCheck(MethodDefinition method, ReturnBlockInfo returnBlockInfo, ModuleReferences moduleReferences)
{
var instructions = method.Body.Instructions;
var returnBlockStartPoints = returnBlockInfo.NewStartPoints;
for (int i = 0; i < returnBlockStartPoints.Length; i++)
{
Instruction injectionPoint = returnBlockStartPoints[i];
int index = instructions.LastIndexOf(injectionPoint);
// Value on stack is the return value
var firstInstruction = Instruction.Create(OpCodes.Dup);
instructions.Insert(index++, firstInstruction);
ILHelpers.InsertGetValueRef(ref index, instructions, method.ReturnType);
const string message = "Return value nullability contract was broken.";
ILHelpers.InsertThrowHelperCallIfValueRefIsNull(
ref index, instructions, moduleReferences.ThrowOutputNullMethod, message, injectionPoint, returnBlockInfo);
returnBlockStartPoints[i] = firstInstruction;
}
}
private static void InjectParameterOutputCheck(ParameterDefinition parameter, MethodDefinition method, ReturnBlockInfo returnBlockInfo, ModuleReferences moduleReferences)
{
var instructions = method.Body.Instructions;
var returnBlockStartPoints = returnBlockInfo.NewStartPoints;
for (int i = 0; i < returnBlockStartPoints.Length; i++)
{
Instruction injectionPoint = returnBlockStartPoints[i];
int index = instructions.LastIndexOf(injectionPoint);
var firstInstruction = Instruction.Create(OpCodes.Ldarg, parameter);
instructions.Insert(index++, firstInstruction);
ILHelpers.InsertGetValueRef(ref index, instructions, parameter.ParameterType);
string message = $"Output parameter '{parameter.Name}' nullability contract was broken.";
ILHelpers.InsertThrowHelperCallIfValueRefIsNull(
ref index, instructions, moduleReferences.ThrowOutputNullMethod, message, injectionPoint, returnBlockInfo);
returnBlockStartPoints[i] = firstInstruction;
}
}