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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Immutable;
using System.Reflection.Metadata.Ecma335;
using System.Reflection.Metadata;
namespace Internal.TypeSystem.Ecma
{
public interface IEntityHandleProvider
{
/// Implement to allow EcmaSignatureEncoder to encode types that need metadata references to be resolved.
/// only used to express non-generic references
EntityHandle GetTypeDefOrRefHandleForTypeDesc(TypeDesc type);
}
public class EcmaSignatureEncoder<TEntityHandleProvider> where TEntityHandleProvider : IEntityHandleProvider
{
private TEntityHandleProvider _entityHandleProvider;
public EcmaSignatureEncoder(TEntityHandleProvider entityHandleProvider)
{
_entityHandleProvider = entityHandleProvider;
}
public void EncodeMethodSignature(BlobBuilder methodSignatureBlob, MethodSignature signature)
{
BlobEncoder encoder = new BlobEncoder(methodSignatureBlob);
MethodSignatureEncoder methodSigEncoder = encoder.MethodSignature(
SignatureCallingConvention.Default, signature.GenericParameterCount, !signature.IsStatic);
ReturnTypeEncoder returnTypeEncoder;
ParametersEncoder parametersEncoder;
methodSigEncoder.Parameters(signature.Length, out returnTypeEncoder, out parametersEncoder);
// Return Type Sig
EncodeTypeSignature(returnTypeEncoder.Type(), signature.ReturnType);
// Parameter Types Sig
for (int i = 0; i < signature.Length; i++)
EncodeTypeSignature(parametersEncoder.AddParameter().Type(), signature[i]);
}
public void EncodeTypeSignature(SignatureTypeEncoder encoder, TypeDesc type)
{
if (type is RuntimeDeterminedType)
{
EncodeTypeSignature(encoder, ((RuntimeDeterminedType)type).RuntimeDeterminedDetailsType);
return;
}
switch (type.Category)
{
case TypeFlags.Boolean:
encoder.Boolean(); break;
case TypeFlags.Byte:
encoder.Byte(); break;
case TypeFlags.SByte:
encoder.SByte(); break;
case TypeFlags.Char:
encoder.Char(); break;
case TypeFlags.Int16:
encoder.Int16(); break;
case TypeFlags.UInt16:
encoder.UInt16(); break;
case TypeFlags.Int32:
encoder.Int32(); break;
case TypeFlags.UInt32:
encoder.UInt32(); break;
case TypeFlags.Int64:
encoder.Int64(); break;
case TypeFlags.UInt64:
encoder.UInt64(); break;
case TypeFlags.Single:
encoder.Single(); break;
case TypeFlags.Double:
encoder.Double(); break;
case TypeFlags.IntPtr:
encoder.IntPtr(); break;
case TypeFlags.UIntPtr:
encoder.UIntPtr(); break;
case TypeFlags.Void:
encoder.Builder.WriteByte((byte)PrimitiveTypeCode.Void);
break;
case TypeFlags.SignatureTypeVariable:
encoder.GenericTypeParameter(((SignatureVariable)type).Index);
break;
case TypeFlags.SignatureMethodVariable:
encoder.GenericMethodTypeParameter(((SignatureMethodVariable)type).Index);
break;
case TypeFlags.GenericParameter:
{
var genericTypeDesc = (GenericParameterDesc)type;
if (genericTypeDesc.Kind == GenericParameterKind.Type)
encoder.GenericTypeParameter(genericTypeDesc.Index);
else
encoder.GenericMethodTypeParameter(genericTypeDesc.Index);
}
break;
case TypeFlags.FunctionPointer:
{
FunctionPointerType fptrType = (FunctionPointerType)type;
encoder.FunctionPointer(
SignatureCallingConvention.Default,
fptrType.Signature.IsStatic ? default(FunctionPointerAttributes) : FunctionPointerAttributes.HasThis,
fptrType.Signature.GenericParameterCount);
// Return Type Sig
EncodeTypeSignature(encoder, fptrType.Signature.ReturnType);
// Parameter Types Sig
for (int i = 0; i < fptrType.Signature.Length; i++)
EncodeTypeSignature(encoder, fptrType.Signature[i]);
}
break;
case TypeFlags.Array:
{
// Skip bounds and lobounds (TODO)
ImmutableArray<int> bounds = ImmutableArray.Create<int>();
ImmutableArray<int> lowerBounds = ImmutableArray.Create<int>();
encoder.Array(
elementType => EncodeTypeSignature(elementType, ((ArrayType)type).ElementType),
arrayShape => arrayShape.Shape(((ArrayType)type).Rank, bounds, lowerBounds));
}
break;
case TypeFlags.SzArray:
encoder.SZArray();
EncodeTypeSignature(encoder, ((ParameterizedType)type).ParameterType);
break;
case TypeFlags.ByRef:
encoder.Builder.WriteByte((byte)SignatureTypeCode.ByReference);
EncodeTypeSignature(encoder, ((ParameterizedType)type).ParameterType);
break;
case TypeFlags.Pointer:
encoder.Builder.WriteByte((byte)SignatureTypeCode.Pointer);
EncodeTypeSignature(encoder, ((ParameterizedType)type).ParameterType);
break;
case TypeFlags.Enum:
case TypeFlags.Class:
case TypeFlags.ValueType:
case TypeFlags.Interface:
case TypeFlags.Nullable:
{
if (type == type.Context.GetWellKnownType(WellKnownType.TypedReference))
encoder.Builder.WriteByte((byte)PrimitiveTypeCode.TypedReference);
else if (type == type.Context.GetWellKnownType(WellKnownType.Object))
encoder.PrimitiveType(PrimitiveTypeCode.Object);
else if (type == type.Context.GetWellKnownType(WellKnownType.String))
encoder.PrimitiveType(PrimitiveTypeCode.String);
else if (type.HasInstantiation && !type.IsGenericDefinition)
{
encoder.GenericInstantiation(_entityHandleProvider.GetTypeDefOrRefHandleForTypeDesc(type.GetTypeDefinition()), type.Instantiation.Length, type.IsValueType);
for (int i = 0; i < type.Instantiation.Length; i++)
EncodeTypeSignature(encoder, type.Instantiation[i]);
}
else
{
encoder.Type(_entityHandleProvider.GetTypeDefOrRefHandleForTypeDesc(type), type.IsValueType);
}
}
break;
default:
throw new InvalidOperationException("Attempting to encode an invalid type signature.");
}
}
}
}
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