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//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2015 Jb Evain
// Copyright (c) 2008 - 2011 Novell, Inc.
//
// Licensed under the MIT/X11 license.
//
using System;
using System.Collections.Generic;
using System.IO;
using Mono.Cecil.Cil;
using Mono.Collections.Generic;
using Mono.CompilerServices.SymbolWriter;
namespace Mono.Cecil.Mdb {
public sealed class MdbReaderProvider : ISymbolReaderProvider {
public ISymbolReader GetSymbolReader (ModuleDefinition module, string fileName)
{
Mixin.CheckModule (module);
Mixin.CheckFileName (fileName);
return new MdbReader (module, MonoSymbolFile.ReadSymbolFile (Mixin.GetMdbFileName (fileName), module.Mvid));
}
public ISymbolReader GetSymbolReader (ModuleDefinition module, Stream symbolStream)
{
Mixin.CheckModule (module);
Mixin.CheckStream (symbolStream);
var file = MonoSymbolFile.ReadSymbolFile (symbolStream);
if (module.Mvid != file.Guid) {
var file_stream = symbolStream as FileStream;
if (file_stream != null)
throw new MonoSymbolFileException ("Symbol file `{0}' does not match assembly", file_stream.Name);
throw new MonoSymbolFileException ("Symbol file from stream does not match assembly");
}
return new MdbReader (module, file);
}
}
public sealed class MdbReader : ISymbolReader {
readonly ModuleDefinition module;
readonly MonoSymbolFile symbol_file;
readonly Dictionary<string, Document> documents;
public MdbReader (ModuleDefinition module, MonoSymbolFile symFile)
{
this.module = module;
this.symbol_file = symFile;
this.documents = new Dictionary<string, Document> ();
}
#if !READ_ONLY
public ISymbolWriterProvider GetWriterProvider ()
{
return new MdbWriterProvider ();
}
#endif
public bool ProcessDebugHeader (ImageDebugHeader header)
{
return symbol_file.Guid == module.Mvid;
}
public MethodDebugInformation Read (MethodDefinition method)
{
var method_token = method.MetadataToken;
var entry = symbol_file.GetMethodByToken (method_token.ToInt32 ());
if (entry == null)
return null;
var info = new MethodDebugInformation (method);
info.code_size = ReadCodeSize (method);
var scopes = ReadScopes (entry, info);
ReadLineNumbers (entry, info);
ReadLocalVariables (entry, scopes);
return info;
}
static int ReadCodeSize (MethodDefinition method)
{
return method.Module.Read (method, (m, reader) => reader.ReadCodeSize (m));
}
static void ReadLocalVariables (MethodEntry entry, ScopeDebugInformation [] scopes)
{
var locals = entry.GetLocals ();
foreach (var local in locals) {
var variable = new VariableDebugInformation (local.Index, local.Name);
var index = local.BlockIndex;
if (index < 0 || index >= scopes.Length)
continue;
var scope = scopes [index];
if (scope == null)
continue;
scope.Variables.Add (variable);
}
}
void ReadLineNumbers (MethodEntry entry, MethodDebugInformation info)
{
var table = entry.GetLineNumberTable ();
info.sequence_points = new Collection<SequencePoint> (table.LineNumbers.Length);
for (var i = 0; i < table.LineNumbers.Length; i++) {
var line = table.LineNumbers [i];
if (i > 0 && table.LineNumbers [i - 1].Offset == line.Offset)
continue;
info.sequence_points.Add (LineToSequencePoint (line));
}
}
Document GetDocument (SourceFileEntry file)
{
var file_name = file.FileName;
Document document;
if (documents.TryGetValue (file_name, out document))
return document;
document = new Document (file_name) {
Hash = file.Checksum,
};
documents.Add (file_name, document);
return document;
}
static ScopeDebugInformation [] ReadScopes (MethodEntry entry, MethodDebugInformation info)
{
var blocks = entry.GetCodeBlocks ();
var scopes = new ScopeDebugInformation [blocks.Length + 1];
info.scope = scopes [0] = new ScopeDebugInformation {
Start = new InstructionOffset (0),
End = new InstructionOffset (info.code_size),
};
foreach (var block in blocks) {
if (block.BlockType != CodeBlockEntry.Type.Lexical && block.BlockType != CodeBlockEntry.Type.CompilerGenerated)
continue;
var scope = new ScopeDebugInformation ();
scope.Start = new InstructionOffset (block.StartOffset);
scope.End = new InstructionOffset (block.EndOffset);
scopes [block.Index + 1] = scope;
if (!AddScope (info.scope.Scopes, scope))
info.scope.Scopes.Add (scope);
}
return scopes;
}
static bool AddScope (Collection<ScopeDebugInformation> scopes, ScopeDebugInformation scope)
{
foreach (var sub_scope in scopes) {
if (sub_scope.HasScopes && AddScope (sub_scope.Scopes, scope))
return true;
if (scope.Start.Offset >= sub_scope.Start.Offset && scope.End.Offset <= sub_scope.End.Offset) {
sub_scope.Scopes.Add (scope);
return true;
}
}
return false;
}
SequencePoint LineToSequencePoint (LineNumberEntry line)
{
var source = symbol_file.GetSourceFile (line.File);
return new SequencePoint (line.Offset, GetDocument (source)) {
StartLine = line.Row,
EndLine = line.EndRow,
StartColumn = line.Column,
EndColumn = line.EndColumn,
};
}
public void Dispose ()
{
symbol_file.Dispose ();
}
}
static class MethodEntryExtensions {
public static bool HasColumnInfo (this MethodEntry entry)
{
return (entry.MethodFlags & MethodEntry.Flags.ColumnsInfoIncluded) != 0;
}
public static bool HasEndInfo (this MethodEntry entry)
{
return (entry.MethodFlags & MethodEntry.Flags.EndInfoIncluded) != 0;
}
}
}
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