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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.Collections.Generic;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Reflection.Metadata;
using System.Reflection.Metadata.Ecma335;
using Internal.Text;
using Internal.TypeSystem;
using Internal.TypeSystem.TypesDebugInfo;
namespace ILCompiler.DependencyAnalysis
{
internal class WindowsDebugMethodSignatureMapSection : ObjectNode, ISymbolDefinitionNode
{
public WindowsDebugMethodSignatureMapSection()
{
}
private ObjectNodeSection _section = new ObjectNodeSection(".dbgmethodsignaturemap", SectionType.ReadOnly);
public override ObjectNodeSection Section => _section;
public override bool IsShareable => false;
public override bool StaticDependenciesAreComputed => true;
public int Offset => 0;
protected internal override int Phase => (int)ObjectNodePhase.Ordered;
public override int ClassCode => (int)ObjectNodeOrder.WindowsDebugMethodSignatureMapSectionNode;
public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
{
sb.Append(GetName(null));
}
struct EmittedMethodWithILToken : IComparable<EmittedMethodWithILToken>
{
public EmittedMethodWithILToken(IMethodBodyNode emittedMethod, uint ilTokenRid)
{
EmittedMethod = emittedMethod;
IlTokenRid = ilTokenRid;
}
public IMethodBodyNode EmittedMethod;
public uint IlTokenRid;
int IComparable<EmittedMethodWithILToken>.CompareTo(EmittedMethodWithILToken other)
{
if (IlTokenRid == other.IlTokenRid)
return 0;
if (IlTokenRid < other.IlTokenRid)
return -1;
return 1;
}
}
//
// returns the DEBUG_S_FUNC_MDTOKEN_MAP subsection as a byte array
// DEBUG_S_FUNC_MDTOKEN_MAP subsection contains method RVA to mdToken mapping
//
// contents of subsection:
// offset 0, 4 bytes: count of entries in the map
// offset 4, 8*N bytes: 4 byte RVA + 4 byte 'offset' relative to the start of 'method data'
// offset 4+8*N, * bytes: all method data packed sequentially with no padding. method data consists of
// 1 byte 'count' of generic parameters, 3 bytes of method's rid and 'count'
// variable sized ECMA formatted TypeSpec signatures for each generic parameter
//
// Compiler places the CTLToken (for a method) or the lexical funclet order (if a method has 1 or more funclets),
// which binder uses to compute the RVA.
//
// all entries are sorted by 'offset' field.
//
// 'offset' optimization: if the method has no generic parameters, we don't need to pass in a signature
// and can encode the mdToken of method in 'offset'
// We do this by setting the high bit of 'offset' and then storing rid part of
// token in last 3 bytes of 'offset'
//
internal DebugInfoBlob GetDebugMethodRVAToTokenMap(ManagedBinaryEmitter pseudoAssembly, IEnumerable<IMethodBodyNode> emittedMethods, out List<Relocation> debugRelocations)
{
DebugInfoBlob methodRVAToTokenMap = new DebugInfoBlob();
DebugInfoBlob methodDataBlob = new DebugInfoBlob();
debugRelocations = new List<Relocation>();
BlobBuilder blobBuilder = new BlobBuilder();
uint entryCount = 0;
methodRVAToTokenMap.WriteDWORD(0); // Placeholder for count of entries in map. Will be udpated later.
List<EmittedMethodWithILToken> tokenInOffsetEntries = new List<EmittedMethodWithILToken>();
foreach (IMethodBodyNode emitted in emittedMethods)
{
NonExternMethodSymbolNode methodNode = emitted as NonExternMethodSymbolNode;
if (methodNode != null && !methodNode.HasCompiledBody)
{
continue;
}
if (!(emitted.Method.GetTypicalMethodDefinition() is Internal.TypeSystem.Ecma.EcmaMethod))
{
continue;
}
EntityHandle methodHandle = pseudoAssembly.EmitMetadataHandleForTypeSystemEntity(emitted.Method.GetTypicalMethodDefinition());
Debug.Assert(methodHandle.Kind == HandleKind.MemberReference);
uint methodToken = (uint)MetadataTokens.GetToken(methodHandle);
uint methodTokenRid = methodToken & 0xFFFFFF;
if (!(emitted.Method.HasInstantiation || emitted.Method.OwningType.HasInstantiation))
{
tokenInOffsetEntries.Add(new EmittedMethodWithILToken(emitted, methodTokenRid));
continue;
}
uint cGenericArguments = checked((uint)emitted.Method.Instantiation.Length + (uint)emitted.Method.OwningType.Instantiation.Length);
// Debugger format does not allow the debugging of methods that have more than 255 generic parameters (spread between the type and method instantiation)
if (cGenericArguments > 0xFF)
continue;
blobBuilder.Clear();
// write the signature for each generic parameter of class
foreach (TypeDesc instantiationType in emitted.Method.OwningType.Instantiation)
pseudoAssembly.EncodeSignatureForType(instantiationType, blobBuilder);
// write the signature for each generic parameter of the method
foreach (TypeDesc instantiationType in emitted.Method.Instantiation)
pseudoAssembly.EncodeSignatureForType(instantiationType, blobBuilder);
Add_DEBUG_S_FUNC_MDTOKEN_MAP_Entry(methodRVAToTokenMap, debugRelocations, emitted, methodDataBlob.Size(), ref entryCount);
methodDataBlob.WriteDWORD(cGenericArguments << 24 | methodTokenRid);
methodDataBlob.WriteBuffer(blobBuilder);
}
// sort tokenInOffsetEntries based on tokenInOffset
tokenInOffsetEntries.Sort();
foreach (EmittedMethodWithILToken emitted in tokenInOffsetEntries)
{
Add_DEBUG_S_FUNC_MDTOKEN_MAP_Entry(methodRVAToTokenMap, debugRelocations, emitted.EmittedMethod, emitted.IlTokenRid | 0x80000000, ref entryCount);
}
methodRVAToTokenMap.SetDWORDAtBlobIndex(0, entryCount); // // Update placeholder for count of entries in map
methodRVAToTokenMap.WriteBuffer(methodDataBlob);
return methodRVAToTokenMap;
}
private void Add_DEBUG_S_FUNC_MDTOKEN_MAP_Entry(DebugInfoBlob methodRVAToTokenMap, List<Relocation> debugRelocations, IMethodBodyNode method, uint methodDataOrOffsetToMethodData, ref uint entryCount)
{
debugRelocations.Add(new Relocation(RelocType.IMAGE_REL_BASED_ADDR32NB, checked((int)methodRVAToTokenMap.Size()), method));
methodRVAToTokenMap.WriteDWORD(0);
methodRVAToTokenMap.WriteDWORD(methodDataOrOffsetToMethodData);
entryCount++;
IMethodBodyNodeWithFuncletSymbols funcletSymbolsNode = method as IMethodBodyNodeWithFuncletSymbols;
if (funcletSymbolsNode != null)
{
foreach (ISymbolNode funclet in funcletSymbolsNode.FuncletSymbols)
{
debugRelocations.Add(new Relocation(RelocType.IMAGE_REL_BASED_ADDR32NB, checked((int)methodRVAToTokenMap.Size()), funclet));
methodRVAToTokenMap.WriteDWORD(0);
methodRVAToTokenMap.WriteDWORD(methodDataOrOffsetToMethodData);
entryCount++;
}
}
}
public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
{
// This node does not trigger generation of other nodes.
if (relocsOnly)
return new ObjectData(Array.Empty<byte>(), Array.Empty<Relocation>(), 1, new ISymbolDefinitionNode[] { this });
List<Relocation> relocations = new List<Relocation>();
DebugInfoBlob debugData = GetDebugMethodRVAToTokenMap(factory.WindowsDebugData.DebugPseudoAssemblySection.PseudoAssembly, factory.MetadataManager.GetCompiledMethodBodies(), out relocations);
return new ObjectData(debugData.ToArray(), relocations.ToArray(), 1, new ISymbolDefinitionNode[] { this });
}
protected override string GetName(NodeFactory context)
{
return "___DebugMethodSignatureMapSection";
}
}
}
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