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using Mono.Cecil.Cil;
using System;
namespace Mono.Cecil {
internal sealed class GenericParameterResolver {
internal static TypeReference ResolveReturnTypeIfNeeded (MethodReference methodReference)
{
if (methodReference.DeclaringType.IsArray && methodReference.Name == "Get")
return methodReference.ReturnType;
var genericInstanceMethod = methodReference as GenericInstanceMethod;
var declaringGenericInstanceType = methodReference.DeclaringType as GenericInstanceType;
if (genericInstanceMethod == null && declaringGenericInstanceType == null)
return methodReference.ReturnType;
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, methodReference.ReturnType);
}
internal static TypeReference ResolveFieldTypeIfNeeded (FieldReference fieldReference)
{
return ResolveIfNeeded (null, fieldReference.DeclaringType as GenericInstanceType, fieldReference.FieldType);
}
internal static TypeReference ResolveParameterTypeIfNeeded (MethodReference method, ParameterReference parameter)
{
var genericInstanceMethod = method as GenericInstanceMethod;
var declaringGenericInstanceType = method.DeclaringType as GenericInstanceType;
if (genericInstanceMethod == null && declaringGenericInstanceType == null)
return parameter.ParameterType;
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, parameter.ParameterType);
}
internal static TypeReference ResolveVariableTypeIfNeeded (MethodReference method, VariableReference variable)
{
var genericInstanceMethod = method as GenericInstanceMethod;
var declaringGenericInstanceType = method.DeclaringType as GenericInstanceType;
if (genericInstanceMethod == null && declaringGenericInstanceType == null)
return variable.VariableType;
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, variable.VariableType);
}
private static TypeReference ResolveIfNeeded (IGenericInstance genericInstanceMethod, IGenericInstance declaringGenericInstanceType, TypeReference parameterType)
{
var byRefType = parameterType as ByReferenceType;
if (byRefType != null)
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, byRefType);
var arrayType = parameterType as ArrayType;
if (arrayType != null)
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, arrayType);
var genericInstanceType = parameterType as GenericInstanceType;
if (genericInstanceType != null)
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, genericInstanceType);
var genericParameter = parameterType as GenericParameter;
if (genericParameter != null)
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, genericParameter);
var requiredModifierType = parameterType as RequiredModifierType;
if (requiredModifierType != null && ContainsGenericParameters (requiredModifierType))
return ResolveIfNeeded (genericInstanceMethod, declaringGenericInstanceType, requiredModifierType.ElementType);
if (ContainsGenericParameters (parameterType))
throw new Exception ("Unexpected generic parameter.");
return parameterType;
}
private static TypeReference ResolveIfNeeded (IGenericInstance genericInstanceMethod, IGenericInstance genericInstanceType, GenericParameter genericParameterElement)
{
return (genericParameterElement.MetadataType == MetadataType.MVar)
? (genericInstanceMethod != null ? genericInstanceMethod.GenericArguments[genericParameterElement.Position] : genericParameterElement)
: genericInstanceType.GenericArguments[genericParameterElement.Position];
}
private static ArrayType ResolveIfNeeded (IGenericInstance genericInstanceMethod, IGenericInstance genericInstanceType, ArrayType arrayType)
{
return new ArrayType (ResolveIfNeeded (genericInstanceMethod, genericInstanceType, arrayType.ElementType), arrayType.Rank);
}
private static ByReferenceType ResolveIfNeeded (IGenericInstance genericInstanceMethod, IGenericInstance genericInstanceType, ByReferenceType byReferenceType)
{
return new ByReferenceType (ResolveIfNeeded (genericInstanceMethod, genericInstanceType, byReferenceType.ElementType));
}
private static GenericInstanceType ResolveIfNeeded (IGenericInstance genericInstanceMethod, IGenericInstance genericInstanceType, GenericInstanceType genericInstanceType1)
{
if (!ContainsGenericParameters (genericInstanceType1))
return genericInstanceType1;
var newGenericInstance = new GenericInstanceType (genericInstanceType1.ElementType);
foreach (var genericArgument in genericInstanceType1.GenericArguments) {
if (!genericArgument.IsGenericParameter) {
newGenericInstance.GenericArguments.Add (ResolveIfNeeded (genericInstanceMethod, genericInstanceType, genericArgument));
continue;
}
var genParam = (GenericParameter)genericArgument;
switch (genParam.Type) {
case GenericParameterType.Type: {
if (genericInstanceType == null)
throw new NotSupportedException ();
newGenericInstance.GenericArguments.Add (genericInstanceType.GenericArguments[genParam.Position]);
}
break;
case GenericParameterType.Method: {
if (genericInstanceMethod == null)
newGenericInstance.GenericArguments.Add (genParam);
else
newGenericInstance.GenericArguments.Add (genericInstanceMethod.GenericArguments[genParam.Position]);
}
break;
}
}
return newGenericInstance;
}
private static bool ContainsGenericParameters (TypeReference typeReference)
{
var genericParameter = typeReference as GenericParameter;
if (genericParameter != null)
return true;
var arrayType = typeReference as ArrayType;
if (arrayType != null)
return ContainsGenericParameters (arrayType.ElementType);
var pointerType = typeReference as PointerType;
if (pointerType != null)
return ContainsGenericParameters (pointerType.ElementType);
var byRefType = typeReference as ByReferenceType;
if (byRefType != null)
return ContainsGenericParameters (byRefType.ElementType);
var sentinelType = typeReference as SentinelType;
if (sentinelType != null)
return ContainsGenericParameters (sentinelType.ElementType);
var pinnedType = typeReference as PinnedType;
if (pinnedType != null)
return ContainsGenericParameters (pinnedType.ElementType);
var requiredModifierType = typeReference as RequiredModifierType;
if (requiredModifierType != null)
return ContainsGenericParameters (requiredModifierType.ElementType);
var genericInstance = typeReference as GenericInstanceType;
if (genericInstance != null) {
foreach (var genericArgument in genericInstance.GenericArguments) {
if (ContainsGenericParameters (genericArgument))
return true;
}
return false;
}
if (typeReference is TypeSpecification)
throw new NotSupportedException ();
return false;
}
}
}
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