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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;
using Internal.TypeSystem;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Node factory to be used during IL scanning.
/// </summary>
public sealed class ILScanNodeFactory : NodeFactory
{
public ILScanNodeFactory(CompilerTypeSystemContext context, CompilationModuleGroup compilationModuleGroup, MetadataManager metadataManager, InteropStubManager interopStubManager, NameMangler nameMangler)
: base(context, compilationModuleGroup, metadataManager, interopStubManager, nameMangler, new LazyGenericsDisabledPolicy(), new LazyVTableSliceProvider(), new LazyDictionaryLayoutProvider(), new ExternSymbolsImportedNodeProvider())
{
}
protected override IMethodNode CreateMethodEntrypointNode(MethodDesc method)
{
if (method.IsInternalCall)
{
// TODO: come up with a scheme where this can be shared between codegen backends and the scanner
if (TypeSystemContext.IsSpecialUnboxingThunkTargetMethod(method))
{
return MethodEntrypoint(TypeSystemContext.GetRealSpecialUnboxingThunkTargetMethod(method));
}
else if (method.IsArrayAddressMethod())
{
return new ScannedMethodNode(((ArrayType)method.OwningType).GetArrayMethod(ArrayMethodKind.AddressWithHiddenArg));
}
else if (method.HasCustomAttribute("System.Runtime", "RuntimeImportAttribute"))
{
return new RuntimeImportMethodNode(method);
}
// On CLR this would throw a SecurityException with "ECall methods must be packaged into a system module."
// This is a corner case that nobody is likely to care about.
ThrowHelper.ThrowInvalidProgramException(ExceptionStringID.InvalidProgramSpecific, method);
}
if (CompilationModuleGroup.ContainsMethodBody(method, false))
{
return new ScannedMethodNode(method);
}
else
{
return new ExternMethodSymbolNode(this, method);
}
}
protected override IMethodNode CreateUnboxingStubNode(MethodDesc method)
{
Debug.Assert(!method.Signature.IsStatic);
if (method.IsCanonicalMethod(CanonicalFormKind.Specific) && !method.HasInstantiation)
{
// Unboxing stubs to canonical instance methods need a special unboxing stub that unboxes
// 'this' and also provides an instantiation argument (we do a calling convention conversion).
// We don't do this for generic instance methods though because they don't use the EEType
// for the generic context anyway.
return new ScannedMethodNode(TypeSystemContext.GetSpecialUnboxingThunk(method, TypeSystemContext.GeneratedAssembly));
}
else
{
// Otherwise we just unbox 'this' and don't touch anything else.
return new UnboxingStubNode(method, Target);
}
}
protected override ISymbolNode CreateReadyToRunHelperNode(ReadyToRunHelperKey helperCall)
{
return new ReadyToRunHelperNode(this, helperCall.HelperId, helperCall.Target);
}
}
}
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