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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.Generic;
using ILCompiler.DependencyAnalysisFramework;
using Internal.Text;
using Internal.TypeSystem;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a concrete method on a generic type (or a generic method) that doesn't
/// have code emitted in the executable because it's physically backed by a canonical
/// method body. The purpose of this node is to track the dependencies of the concrete
/// method body, as if it was generated. The node acts as a symbol for the canonical
/// method for convenience.
/// </summary>
public class ShadowConcreteMethodNode : DependencyNodeCore<NodeFactory>, IMethodNode, ISymbolNodeWithLinkage
{
/// <summary>
/// Gets the canonical method body that defines the dependencies of this node.
/// </summary>
public IMethodNode CanonicalMethodNode { get; }
/// <summary>
/// Gets the concrete method represented by this node.
/// </summary>
public MethodDesc Method { get; }
// Implementation of ISymbolNode that makes this node act as a symbol for the canonical body
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
CanonicalMethodNode.AppendMangledName(nameMangler, sb);
}
public int Offset => CanonicalMethodNode.Offset;
public bool RepresentsIndirectionCell => CanonicalMethodNode.RepresentsIndirectionCell;
public override bool StaticDependenciesAreComputed
=> CanonicalMethodNode.StaticDependenciesAreComputed;
public ShadowConcreteMethodNode(MethodDesc method, IMethodNode canonicalMethod)
{
Debug.Assert(!method.IsSharedByGenericInstantiations);
Debug.Assert(!method.IsRuntimeDeterminedExactMethod);
Debug.Assert(canonicalMethod.Method.IsSharedByGenericInstantiations);
Debug.Assert(canonicalMethod.Method == method.GetCanonMethodTarget(CanonicalFormKind.Specific));
Method = method;
CanonicalMethodNode = canonicalMethod;
}
public ISymbolNode NodeForLinkage(NodeFactory factory)
{
return CanonicalMethodNode;
}
public override IEnumerable<DependencyListEntry> GetStaticDependencies(NodeFactory factory)
{
DependencyList dependencies = new DependencyList();
// Make sure the canonical body gets generated
dependencies.Add(new DependencyListEntry(CanonicalMethodNode, "Canonical body"));
// Instantiate the runtime determined dependencies of the canonical method body
// with the concrete instantiation of the method to get concrete dependencies.
Instantiation typeInst = Method.OwningType.Instantiation;
Instantiation methodInst = Method.Instantiation;
IEnumerable<DependencyListEntry> staticDependencies = CanonicalMethodNode.GetStaticDependencies(factory);
if (staticDependencies != null)
{
foreach (DependencyListEntry canonDep in staticDependencies)
{
var runtimeDep = canonDep.Node as INodeWithRuntimeDeterminedDependencies;
if (runtimeDep != null)
{
dependencies.AddRange(runtimeDep.InstantiateDependencies(factory, typeInst, methodInst));
}
}
}
if (Method.HasInstantiation)
{
if (Method.IsVirtual)
dependencies.Add(new DependencyListEntry(factory.GVMDependencies(Method), "GVM Dependencies Support for method dictionary"));
// Dictionary dependency
dependencies.Add(new DependencyListEntry(factory.MethodGenericDictionary(Method), "Method dictionary"));
}
return dependencies;
}
protected override string GetName(NodeFactory factory) => $"{Method.ToString()} backed by {CanonicalMethodNode.GetMangledName(factory.NameMangler)}";
public sealed override bool HasConditionalStaticDependencies => false;
public sealed override bool HasDynamicDependencies => false;
public sealed override bool InterestingForDynamicDependencyAnalysis => false;
public sealed override IEnumerable<CombinedDependencyListEntry> SearchDynamicDependencies(List<DependencyNodeCore<NodeFactory>> markedNodes, int firstNode, NodeFactory factory) => null;
public sealed override IEnumerable<CombinedDependencyListEntry> GetConditionalStaticDependencies(NodeFactory factory) => null;
int ISortableNode.ClassCode => -1440570971;
int ISortableNode.CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
var compare = comparer.Compare(Method, ((ShadowConcreteMethodNode)other).Method);
if (compare != 0)
return compare;
return comparer.Compare(CanonicalMethodNode, ((ShadowConcreteMethodNode)other).CanonicalMethodNode);
}
}
}
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