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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 System.Runtime.InteropServices;
using Internal.Text;
using Internal.TypeSystem;
namespace ILCompiler.DependencyAnalysis
{
/// <summary>
/// Represents a single PInvoke MethodFixupCell as defined in the core library.
/// </summary>
public class PInvokeMethodFixupNode : ObjectNode, ISymbolDefinitionNode
{
private string _moduleName;
private string _entryPointName;
private PInvokeFlags _flags;
public PInvokeMethodFixupNode(string moduleName, string entryPointName, PInvokeFlags flags)
{
_moduleName = moduleName;
_entryPointName = entryPointName;
_flags = flags;
}
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append("__pinvoke_");
sb.Append(_moduleName);
sb.Append("__");
sb.Append(_entryPointName);
if(!_flags.ExactSpelling)
{
sb.Append("__");
sb.Append(_flags.CharSet.ToString());
}
sb.Append("__");
sb.Append(((int)_flags.Attributes).ToString());
}
public int Offset => 0;
public override bool IsShareable => true;
protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);
public override ObjectNodeSection Section => ObjectNodeSection.DataSection;
public override bool StaticDependenciesAreComputed => true;
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
ObjectDataBuilder builder = new ObjectDataBuilder(factory, relocsOnly);
builder.AddSymbol(this);
//
// Emit a MethodFixupCell struct
//
// Address (to be fixed up at runtime)
builder.EmitZeroPointer();
// Entry point name
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.Substring(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(_moduleName));
builder.EmitInt(_flags.ExactSpelling ? 0 : (int)_flags.CharSet);
return builder.ToObjectData();
}
public override int ClassCode => -1592006940;
public override int CompareToImpl(ISortableNode other, CompilerComparer comparer)
{
var flagsCompare = _flags.CompareTo(((PInvokeMethodFixupNode)other)._flags);
if (flagsCompare != 0)
return flagsCompare;
var moduleCompare = string.Compare(_moduleName, ((PInvokeMethodFixupNode)other)._moduleName);
if (moduleCompare != 0)
return moduleCompare;
return string.Compare(_entryPointName, ((PInvokeMethodFixupNode)other)._entryPointName);
}
}
}
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