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MonoCecilDebugInfoProvider.cs
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MonoCecilDebugInfoProvider.cs
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// Copyright (c) 2018 Siegfried Pammer
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection.Metadata.Ecma335;
using ICSharpCode.Decompiler.DebugInfo;
using ICSharpCode.Decompiler.Metadata;
using ICSharpCode.Decompiler.Util;
using Mono.Cecil;
using Mono.Cecil.Pdb;
using SRM = System.Reflection.Metadata;
namespace ICSharpCode.Decompiler.PdbProvider.Cecil
{
public class MonoCecilDebugInfoProvider : IDebugInfoProvider
{
readonly Dictionary<SRM.MethodDefinitionHandle, (IList<SequencePoint> SequencePoints, IList<Variable> Variables)> debugInfo;
public unsafe MonoCecilDebugInfoProvider(PEFile module, string pdbFileName, string description = null)
{
if (module == null) {
throw new ArgumentNullException(nameof(module));
}
if (!module.Reader.IsEntireImageAvailable) {
throw new ArgumentException("This provider needs access to the full image!");
}
this.Description = description ?? $"Loaded from PDB file: {pdbFileName}";
var image = module.Reader.GetEntireImage();
this.debugInfo = new Dictionary<SRM.MethodDefinitionHandle, (IList<SequencePoint> SequencePoints, IList<Variable> Variables)>();
using (UnmanagedMemoryStream stream = new UnmanagedMemoryStream(image.Pointer, image.Length))
using (var moduleDef = ModuleDefinition.ReadModule(stream)) {
moduleDef.ReadSymbols(new PdbReaderProvider().GetSymbolReader(moduleDef, pdbFileName));
foreach (var method in module.Metadata.MethodDefinitions) {
var cecilMethod = moduleDef.LookupToken(MetadataTokens.GetToken(method)) as MethodDefinition;
var debugInfo = cecilMethod?.DebugInformation;
if (debugInfo == null)
continue;
IList<SequencePoint> sequencePoints = EmptyList<SequencePoint>.Instance;
if (debugInfo.HasSequencePoints) {
sequencePoints = new List<SequencePoint>(debugInfo.SequencePoints.Count);
foreach (var point in debugInfo.SequencePoints) {
sequencePoints.Add(new SequencePoint {
Offset = point.Offset,
StartLine = point.StartLine,
StartColumn = point.StartColumn,
EndLine = point.EndLine,
EndColumn = point.EndColumn,
DocumentUrl = point.Document.Url
});
}
}
var variables = new List<Variable>();
foreach (var scope in debugInfo.GetScopes()) {
if (!scope.HasVariables)
continue;
foreach (var v in scope.Variables) {
variables.Add(new Variable(v.Index, v.Name));
}
}
this.debugInfo.Add(method, (sequencePoints, variables));
}
}
}
public string Description { get; }
public IList<SequencePoint> GetSequencePoints(SRM.MethodDefinitionHandle handle)
{
if (!debugInfo.TryGetValue(handle, out var info)) {
return EmptyList<SequencePoint>.Instance;
}
return info.SequencePoints;
}
public IList<Variable> GetVariables(SRM.MethodDefinitionHandle handle)
{
if (!debugInfo.TryGetValue(handle, out var info)) {
return EmptyList<Variable>.Instance;
}
return info.Variables;
}
public bool TryGetName(SRM.MethodDefinitionHandle handle, int index, out string name)
{
name = null;
if (!debugInfo.TryGetValue(handle, out var info)) {
return false;
}
var variable = info.Variables.FirstOrDefault(v => v.Index == index);
name = variable.Name;
return name != null;
}
}
}