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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;
using System.Diagnostics;
using System.Runtime.InteropServices;
using Internal.IL.Stubs;
using Internal.Runtime;
using Internal.Text;
using Internal.TypeSystem;
using Internal.TypeSystem.Ecma;
using Internal.TypeSystem.Interop;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a single PInvoke MethodFixupCell as defined in the core library.
/// </summary>
public class PInvokeMethodFixupNode : ObjectNode, ISymbolDefinitionNode
{
private readonly PInvokeMethodData _pInvokeMethodData;
public PInvokeMethodFixupNode(PInvokeMethodData pInvokeMethodData)
{
_pInvokeMethodData = pInvokeMethodData;
}
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append("__pinvoke_");
_pInvokeMethodData.AppendMangledName(nameMangler, sb);
}
public int Offset => 0;
public override bool IsShareable => true;
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectNodeSection GetSection(NodeFactory factory) => ObjectNodeSection.DataSection;
public override bool StaticDependenciesAreComputed => true;
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
ObjectDataBuilder builder = new ObjectDataBuilder(factory, relocsOnly);
builder.RequireInitialPointerAlignment();
builder.AddSymbol(this);
//
// Emit a MethodFixupCell struct
//
// Address (to be fixed up at runtime)
builder.EmitZeroPointer();
// Entry point name
string entryPointName = _pInvokeMethodData.EntryPointName;
if (factory.Target.IsWindows && entryPointName.StartsWith("#", StringComparison.OrdinalIgnoreCase))
{
// Windows-specific ordinal import
// CLR-compatible behavior: Strings that can't be parsed as a signed integer are treated as zero.
int entrypointOrdinal;
if (!int.TryParse(entryPointName.AsSpan(1), out entrypointOrdinal))
entrypointOrdinal = 0;
// CLR-compatible behavior: Ordinal imports are 16-bit on Windows. Discard rest of the bits.
builder.EmitNaturalInt((ushort)entrypointOrdinal);
}
else
{
// Import by name
builder.EmitPointerReloc(factory.ConstantUtf8String(entryPointName));
}
// Module fixup cell
builder.EmitPointerReloc(factory.PInvokeModuleFixup(_pInvokeMethodData.ModuleData));
int flags = 0;
int charsetFlags = (int)_pInvokeMethodData.CharSetMangling;
Debug.Assert((charsetFlags & MethodFixupCellFlagsConstants.CharSetMask) == charsetFlags);
charsetFlags &= MethodFixupCellFlagsConstants.CharSetMask;
flags |= charsetFlags;
int? objcFunction = MarshalHelpers.GetObjectiveCMessageSendFunction(factory.Target, _pInvokeMethodData.ModuleData.ModuleName, _pInvokeMethodData.EntryPointName);
if (objcFunction.HasValue)
{
flags |= MethodFixupCellFlagsConstants.IsObjectiveCMessageSendMask;
int objcFunctionFlags = objcFunction.Value << MethodFixupCellFlagsConstants.ObjectiveCMessageSendFunctionShift;
Debug.Assert((objcFunctionFlags & MethodFixupCellFlagsConstants.ObjectiveCMessageSendFunctionMask) == objcFunctionFlags);
objcFunctionFlags &= MethodFixupCellFlagsConstants.ObjectiveCMessageSendFunctionMask;
flags |= objcFunctionFlags;
}
builder.EmitInt(flags);
return builder.ToObjectData();
}
public override int ClassCode => -1592006940;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
return _pInvokeMethodData.CompareTo(((PInvokeMethodFixupNode)other)._pInvokeMethodData, comparer);
}
}
public readonly struct PInvokeMethodData : IEquatable<PInvokeMethodData>
{
public readonly PInvokeModuleData ModuleData;
public readonly string EntryPointName;
public readonly CharSet CharSetMangling;
public PInvokeMethodData(PInvokeLazyFixupField pInvokeLazyFixupField)
{
PInvokeMetadata metadata = pInvokeLazyFixupField.PInvokeMetadata;
ModuleDesc declaringModule = ((MetadataType)pInvokeLazyFixupField.TargetMethod.OwningType).Module;
DllImportSearchPath? dllImportSearchPath = default;
if (declaringModule.Assembly is EcmaAssembly asm)
{
// We look for [assembly:DefaultDllImportSearchPaths(...)]
var attrHandle = asm.MetadataReader.GetCustomAttributeHandle(asm.AssemblyDefinition.GetCustomAttributes(),
"System.Runtime.InteropServices", "DefaultDllImportSearchPathsAttribute");
if (!attrHandle.IsNil)
{
var attr = asm.MetadataReader.GetCustomAttribute(attrHandle);
var decoded = attr.DecodeValue(new CustomAttributeTypeProvider(asm));
if (decoded.FixedArguments.Length == 1 &&
decoded.FixedArguments[0].Value is int searchPath)
{
dllImportSearchPath = (DllImportSearchPath)searchPath;
}
}
}
ModuleData = new PInvokeModuleData(metadata.Module, dllImportSearchPath, declaringModule);
EntryPointName = metadata.Name;
CharSet charSetMangling = default;
if (declaringModule.Context.Target.IsWindows && !metadata.Flags.ExactSpelling)
{
// Mirror CharSet normalization from Marshaller.CreateMarshaller
bool isAnsi = metadata.Flags.CharSet switch
{
CharSet.Ansi => true,
CharSet.Unicode => false,
CharSet.Auto => false,
_ => true
};
charSetMangling = isAnsi ? CharSet.Ansi : CharSet.Unicode;
}
CharSetMangling = charSetMangling;
}
public bool Equals(PInvokeMethodData other)
{
return ModuleData.Equals(other.ModuleData) &&
EntryPointName == other.EntryPointName &&
CharSetMangling == other.CharSetMangling;
}
public override bool Equals(object obj)
{
return obj is PInvokeMethodData other && Equals(other);
}
public override int GetHashCode()
{
return ModuleData.GetHashCode() ^ EntryPointName.GetHashCode();
}
public int CompareTo(PInvokeMethodData other, CompilerComparer comparer)
{
var entryPointCompare = StringComparer.Ordinal.Compare(EntryPointName, other.EntryPointName);
if (entryPointCompare != 0)
return entryPointCompare;
var moduleCompare = ModuleData.CompareTo(other.ModuleData, comparer);
if (moduleCompare != 0)
return moduleCompare;
return CharSetMangling.CompareTo(other.CharSetMangling);
}
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
ModuleData.AppendMangledName(nameMangler, sb);
sb.Append("__");
sb.Append(EntryPointName);
if (CharSetMangling != default)
{
sb.Append("__");
sb.Append(CharSetMangling.ToString());
}
}
}
}
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