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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.
// See the LICENSE file in the project root for more information.
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.CodeGen;
namespace Microsoft.CodeAnalysis.CSharp.Symbols
{
internal sealed class SynthesizedInlineArrayAsSpanMethod : SynthesizedGlobalMethodSymbol
{
internal SynthesizedInlineArrayAsSpanMethod(SynthesizedPrivateImplementationDetailsType privateImplType, string synthesizedMethodName, NamedTypeSymbol spanType, NamedTypeSymbol intType)
: base(privateImplType, synthesizedMethodName)
{
this.SetTypeParameters(ImmutableArray.Create<TypeParameterSymbol>(new SynthesizedSimpleMethodTypeParameterSymbol(this, 0, "TBuffer"), new SynthesizedSimpleMethodTypeParameterSymbol(this, 1, "TElement")));
this.SetReturnType(spanType.Construct(TypeParameters[1]));
this.SetParameters(ImmutableArray.Create<ParameterSymbol>(SynthesizedParameterSymbol.Create(this, TypeWithAnnotations.Create(TypeParameters[0]), 0, RefKind.Ref, "buffer"),
SynthesizedParameterSymbol.Create(this, TypeWithAnnotations.Create(intType), 1, RefKind.None, "length")));
}
internal override void GenerateMethodBody(TypeCompilationState compilationState, BindingDiagnosticBag diagnostics)
{
SyntheticBoundNodeFactory f = new SyntheticBoundNodeFactory(this, this.GetNonNullSyntaxNode(), compilationState, diagnostics);
f.CurrentFunction = this;
try
{
// return MemoryMarshal.CreateSpan<TElement>(ref Unsafe.As<TBuffer, TElement>(ref buffer), length)
var body = f.Return(f.Call(null,
f.WellKnownMethod(WellKnownMember.System_Runtime_InteropServices_MemoryMarshal__CreateSpan).Construct(TypeParameters[1]),
f.Call(null,
f.WellKnownMethod(WellKnownMember.System_Runtime_CompilerServices_Unsafe__As_T).Construct(ImmutableArray<TypeSymbol>.CastUp(TypeParameters)),
f.Parameter(Parameters[0])),
f.Parameter(Parameters[1])));
// NOTE: we created this block in its most-lowered form, so analysis is unnecessary
f.CloseMethod(body);
}
catch (SyntheticBoundNodeFactory.MissingPredefinedMember ex)
{
diagnostics.Add(ex.Diagnostic);
f.CloseMethod(f.ThrowNull());
}
}
}
}
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