/
StandaloneSignature.cs
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/
StandaloneSignature.cs
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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.Collections.Immutable;
using System.Diagnostics;
using System.Reflection.Metadata.Ecma335;
namespace System.Reflection.Metadata
{
public readonly struct StandaloneSignature
{
private readonly MetadataReader _reader;
// Workaround: JIT doesn't generate good code for nested structures, so use RowId.
private readonly int _rowId;
internal StandaloneSignature(MetadataReader reader, StandaloneSignatureHandle handle)
{
Debug.Assert(reader != null);
Debug.Assert(!handle.IsNil);
_reader = reader;
_rowId = handle.RowId;
}
private StandaloneSignatureHandle Handle
{
get { return StandaloneSignatureHandle.FromRowId(_rowId); }
}
/// <summary>
/// Gets a handle to the signature blob.
/// </summary>
public BlobHandle Signature
{
get { return _reader.StandAloneSigTable.GetSignature(_rowId); }
}
public MethodSignature<TType> DecodeMethodSignature<TType, TGenericContext>(ISignatureTypeProvider<TType, TGenericContext> provider, TGenericContext genericContext)
{
var decoder = new SignatureDecoder<TType, TGenericContext>(provider, _reader, genericContext);
var blobReader = _reader.GetBlobReader(Signature);
return decoder.DecodeMethodSignature(ref blobReader);
}
public ImmutableArray<TType> DecodeLocalSignature<TType, TGenericContext>(ISignatureTypeProvider<TType, TGenericContext> provider, TGenericContext genericContext)
{
var decoder = new SignatureDecoder<TType, TGenericContext>(provider, _reader, genericContext);
var blobReader = _reader.GetBlobReader(Signature);
return decoder.DecodeLocalSignature(ref blobReader);
}
public CustomAttributeHandleCollection GetCustomAttributes()
{
return new CustomAttributeHandleCollection(_reader, Handle);
}
/// <summary>
/// Determines the kind of signature, which can be <see cref="SignatureKind.Method"/> or <see cref="SignatureKind.LocalVariables"/>
/// </summary>
/// <exception cref="BadImageFormatException">The signature is invalid.</exception>
public StandaloneSignatureKind GetKind()
{
BlobReader blobReader = _reader.GetBlobReader(this.Signature);
SignatureHeader header = blobReader.ReadSignatureHeader();
return header.Kind switch
{
SignatureKind.Method => StandaloneSignatureKind.Method,
SignatureKind.LocalVariables => StandaloneSignatureKind.LocalVariables,
_ => throw new BadImageFormatException(),
};
}
}
}