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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 Internal.TypeSystem;
using Debug = System.Diagnostics.Debug;
namespace Internal.IL.Stubs
{
/// <summary>
/// Thunk to call the underlying type's GetHashCode method on enum types.
/// This method prevents boxing of 'this' that would be required before a call to
/// the System.Enum's default implementation.
/// </summary>
internal partial class EnumGetHashCodeThunk : ILStubMethod
{
private TypeDesc _owningType;
private MethodSignature _signature;
public EnumGetHashCodeThunk(TypeDesc owningType)
{
Debug.Assert(owningType.IsEnum);
_owningType = owningType;
_signature = ObjectGetHashCodeMethod.Signature;
}
private MethodDesc ObjectGetHashCodeMethod
{
get
{
return Context.GetWellKnownType(WellKnownType.Object).GetKnownMethod("GetHashCode", null);
}
}
public override TypeSystemContext Context
{
get
{
return _owningType.Context;
}
}
public override TypeDesc OwningType
{
get
{
return _owningType;
}
}
public override MethodSignature Signature
{
get
{
return _signature;
}
}
public override string Name
{
get
{
return "GetHashCode";
}
}
public override string DiagnosticName
{
get
{
return "GetHashCode";
}
}
public override bool IsVirtual
{
get
{
// This would be implicit (false is the default), but let's be very explicit.
// Making this an actual override would cause size bloat with very little benefit.
// The usefulness of this method lies in it's ability to prevent boxing of 'this'.
// The base implementation on System.Enum is adequate for everything else.
return false;
}
}
public override MethodIL EmitIL()
{
ILEmitter emitter = new ILEmitter();
ILCodeStream codeStream = emitter.NewCodeStream();
codeStream.EmitLdArg(0);
codeStream.Emit(ILOpcode.constrained, emitter.NewToken(_owningType.UnderlyingType));
codeStream.Emit(ILOpcode.callvirt, emitter.NewToken(ObjectGetHashCodeMethod));
codeStream.Emit(ILOpcode.ret);
return emitter.Link(this);
}
}
/// <summary>
/// Thunk to compare underlying values of enums in the Equals method.
/// This method prevents boxing of 'this' that would be required before a call to
/// the System.Enum's default implementation.
/// </summary>
internal partial class EnumEqualsThunk : ILStubMethod
{
private TypeDesc _owningType;
private MethodSignature _signature;
public EnumEqualsThunk(TypeDesc owningType)
{
Debug.Assert(owningType.IsEnum);
_owningType = owningType;
_signature = ObjectEqualsMethod.Signature;
}
private MethodDesc ObjectEqualsMethod
{
get
{
return Context.GetWellKnownType(WellKnownType.Object).GetKnownMethod("Equals", null);
}
}
public override TypeSystemContext Context
{
get
{
return _owningType.Context;
}
}
public override TypeDesc OwningType
{
get
{
return _owningType;
}
}
public override MethodSignature Signature
{
get
{
return _signature;
}
}
public override string Name
{
get
{
return "Equals";
}
}
public override string DiagnosticName
{
get
{
return "Equals";
}
}
public override bool IsVirtual
{
get
{
// This would be implicit (false is the default), but let's be very explicit.
// Making this an actual override would cause size bloat with very little benefit.
// The usefulness of this method lies in it's ability to prevent boxing of 'this'.
// The base implementation on System.Enum is adequate for everything else.
return false;
}
}
public override MethodIL EmitIL()
{
ILEmitter emitter = new ILEmitter();
ILCodeStream codeStream = emitter.NewCodeStream();
// InstantiateAsOpen covers the weird case of generic enums
TypeDesc owningTypeAsOpen = _owningType.InstantiateAsOpen();
ILCodeLabel lNotEqual = emitter.NewCodeLabel();
// if (!(obj is {enumtype}))
// return false;
codeStream.EmitLdArg(1);
codeStream.Emit(ILOpcode.isinst, emitter.NewToken(owningTypeAsOpen));
codeStream.Emit(ILOpcode.dup);
codeStream.Emit(ILOpcode.brfalse, lNotEqual);
// return ({underlyingtype})this == ({underlyingtype})obj;
// PREFER: ILOpcode.unbox, but the codegen for that is pretty bad
codeStream.Emit(ILOpcode.ldflda, emitter.NewToken(Context.GetWellKnownType(WellKnownType.Object).GetKnownField("m_pEEType")));
codeStream.EmitLdc(Context.Target.PointerSize);
codeStream.Emit(ILOpcode.add);
codeStream.EmitLdInd(owningTypeAsOpen);
codeStream.EmitLdArg(0);
codeStream.EmitLdInd(owningTypeAsOpen);
codeStream.Emit(ILOpcode.ceq);
codeStream.Emit(ILOpcode.ret);
codeStream.EmitLabel(lNotEqual);
codeStream.Emit(ILOpcode.pop);
codeStream.EmitLdc(0);
codeStream.Emit(ILOpcode.ret);
return emitter.Link(this);
}
}
}
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