public void GetParameters_InstructionsThatReadParameters_ReturnsParameters()
{
MethodReference method = CecilUtility.Import(() => string.Format("Test", 12));
var instructions = new[]
{
Instruction.Create(OpCodes.Ldarg_1),
Instruction.Create(OpCodes.Ldarg_0)
};
Parameter parameter = new Parameter(CecilUtility.Import(typeof(string)), 0);
_instructionHelperMock
.Setup(helper => helper.ReadsParameter(method, instructions[0], out parameter))
.Returns(true);
Parameter parameter2 = new Parameter(CecilUtility.Import(typeof(int)), 1);
_instructionHelperMock
.Setup(helper => helper.ReadsParameter(method, instructions[1], out parameter2))
.Returns(true);
var subject = new ParameterDeducer(_instructionHelperMock.Object);
TypeReference[] result = subject.GetParameters(method, instructions);
Assert.AreEqual(2, result.Length);
Assert.AreEqual(parameter.ParameterType, result[0]);
Assert.AreEqual(parameter2.ParameterType, result[1]);
}
public void Constructor_SetsProperties()
{
const int index = 42;
var type = CecilUtility.Import(typeof(string));
var subject = new Parameter(type, index);
Assert.AreSame(type, subject.ParameterType);
Assert.AreEqual(index, subject.Index);
}
public bool ReadsParameter(MethodReference method, Instruction instruction,
out Parameter parameter)
{
var parameters = method.Parameters;
int offset = method.HasThis ? 1 : 0;
TypeReference parameterType = null;
int index = -1;
switch (instruction.OpCode.Code)
{
case Code.Ldarg_0:
parameterType = method.HasThis ? method.DeclaringType : parameters[0].ParameterType;
index = 0;
break;
case Code.Ldarg_1:
parameterType = parameters[1 - offset].ParameterType;
index = 1;
break;
case Code.Ldarg_2:
parameterType = parameters[2 - offset].ParameterType;
index = 2;
break;
case Code.Ldarg_3:
parameterType = parameters[3 - offset].ParameterType;
index = 3;
break;
case Code.Ldarg_S:
case Code.Ldarg:
case Code.Ldarga:
case Code.Ldarga_S:
parameterType = ((ParameterReference)instruction.Operand).ParameterType;
index = ((ParameterReference)instruction.Operand).Index + offset;
break;
}
parameter = parameterType != null ? new Parameter(parameterType, index) : null;
return parameter != null;
}