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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.Text;
using Internal.TypeSystem;
using ILCompiler.DependencyAnalysisFramework;
using Debug = System.Diagnostics.Debug;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents an unboxing stub that supports calling instance methods on boxed valuetypes.
/// </summary>
public partial class UnboxingStubNode : AssemblyStubNode, IMethodNode, IExportableSymbolNode
{
// Section name on Windows has to be alphabetically less than the ending WindowsUnboxingStubsRegionNode node, and larger than
// the begining WindowsUnboxingStubsRegionNode node, in order to have proper delimiters to the begining/ending of the
// stubs region, in order for the runtime to know where the region starts and ends.
internal static readonly string WindowsSectionName = ".unbox$M";
internal static readonly string UnixSectionName = "__unbox";
private readonly TargetDetails _targetDetails;
public MethodDesc Method { get; }
public override ObjectNodeSection Section
{
get
{
string sectionName = _targetDetails.IsWindows ? WindowsSectionName : UnixSectionName;
return new ObjectNodeSection(sectionName, SectionType.Executable);
}
}
public override bool IsShareable => true;
public ExportForm GetExportForm(NodeFactory factory) => factory.CompilationModuleGroup.GetExportMethodForm(Method, true);
public UnboxingStubNode(MethodDesc target, TargetDetails targetDetails)
{
Debug.Assert(target.GetCanonMethodTarget(CanonicalFormKind.Specific) == target);
Debug.Assert(target.OwningType.IsValueType);
Method = target;
_targetDetails = targetDetails;
}
private ISymbolNode GetUnderlyingMethodEntrypoint(NodeFactory factory)
{
ISymbolNode node = factory.MethodEntrypoint(Method);
if (node is RuntimeDecodableJumpStubNode)
{
return ((RuntimeDecodableJumpStubNode)node).Target;
}
return node;
}
public override void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append("unbox_").Append(nameMangler.GetMangledMethodName(Method));
}
public static string GetMangledName(NameMangler nameMangler, MethodDesc method)
{
return "unbox_" + nameMangler.GetMangledMethodName(method);
}
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override int ClassCode => -1846923013;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
return comparer.Compare(Method, ((UnboxingStubNode)other).Method);
}
}
//
// On Windows, we need to create special start/stop sections, in order to group all the unboxing stubs and
// have delimiters accessible through extern "C" variables in the bootstrapper. On Linux/Apple, the linker provides
// special names to the begining and end of sections already.
//
public class WindowsUnboxingStubsRegionNode : ObjectNode, ISymbolDefinitionNode
{
private readonly bool _isEndSymbol;
public override ObjectNodeSection Section => new ObjectNodeSection(".unbox$" + (_isEndSymbol? "Z" : "A"), SectionType.Executable);
public override bool IsShareable => true;
public override bool StaticDependenciesAreComputed => true;
public int Offset => 0;
public WindowsUnboxingStubsRegionNode(bool isEndSymbol)
{
_isEndSymbol = isEndSymbol;
}
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append("__unbox_" + (_isEndSymbol ? "z" : "a"));
}
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
Debug.Assert(factory.Target.IsWindows);
ObjectDataBuilder objData = new ObjectDataBuilder(factory, relocsOnly);
objData.RequireInitialAlignment(factory.Target.MinimumFunctionAlignment);
objData.AddSymbol(this);
return objData.ToObjectData();
}
public override int ClassCode => 1102274050;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
return _isEndSymbol.CompareTo(((WindowsUnboxingStubsRegionNode)other)._isEndSymbol);
}
}
}
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