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Type Inference: retrieve generic parameter instantiated type #49

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Type Inference: retrieve generic parameter instantiated type #49

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22 changes: 22 additions & 0 deletions Backend/Analyses/TypeInferenceAnalysis.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
using Backend.Model;
using Model.ThreeAddressCode.Values;
using Backend.Utils;
using Model;

namespace Backend.Analyses
{
Expand Down Expand Up @@ -56,6 +57,27 @@ public override void Visit(MethodCallInstruction instruction)
if (instruction.HasResult)
{
instruction.Result.Type = instruction.Method.ReturnType;

// if returnType is a genericParameter that is instantiated, then use its instantiated type
if (instruction.Method.ReturnType is IGenericParameterReference genericParameterReference)
{
IList<IType> genericArguments;
switch (genericParameterReference.Kind)
{
case GenericParameterKind.Type:
genericArguments = ((IBasicType) genericParameterReference.GenericContainer).GenericArguments;
break;
case GenericParameterKind.Method:
genericArguments = ((IMethodReference) genericParameterReference.GenericContainer).GenericArguments;
break;
default:
throw genericParameterReference.Kind.ToUnknownValueException();
}
if (genericArguments.Count > 0)
{
instruction.Result.Type = genericArguments[genericParameterReference.Index];
}
}
}

// Skip implicit "this" parameter.
Expand Down