86 строки
3.0 KiB
C#
86 строки
3.0 KiB
C#
using System;
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using System.IO;
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using System.Text;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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namespace Xamarin.Linker {
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public sealed class CustomSymbolWriterProvider : ISymbolWriterProvider {
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readonly DefaultSymbolWriterProvider default_symbol_writer_provider = new DefaultSymbolWriterProvider ();
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public ISymbolWriter GetSymbolWriter (ModuleDefinition module, string filename)
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=> new CustomSymbolWriter (default_symbol_writer_provider.GetSymbolWriter (module, filename));
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public ISymbolWriter GetSymbolWriter (ModuleDefinition module, Stream symbolStream)
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=> new CustomSymbolWriter (default_symbol_writer_provider.GetSymbolWriter (module, symbolStream));
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}
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// This is symbol writer wraps another symbol writer, and changes one thing:
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// it writes the filename part of the pdb (as opposed to the full path), in the debug header of the dll.
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// References:
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// https://bugzilla.xamarin.com/show_bug.cgi?id=54578 (Assemblies are duplicated in fat apps when built with .pdb, because pdb paths are different)
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// https://github.com/jbevain/cecil/issues/372 (first attempt at a fix: make cecil write the filename only)
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// https://github.com/jbevain/cecil/pull/554 (first fix attempt broke something else, so it had to be reverted)
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public sealed class CustomSymbolWriter : ISymbolWriter {
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readonly ISymbolWriter _symbolWriter;
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public CustomSymbolWriter (ISymbolWriter symbolWriter)
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{
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_symbolWriter = symbolWriter;
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}
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public ImageDebugHeader GetDebugHeader ()
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{
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var header = _symbolWriter.GetDebugHeader ();
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if (!header.HasEntries)
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return header;
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for (int i = 0; i < header.Entries.Length; i++) {
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header.Entries [i] = ProcessEntry (header.Entries [i]);
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}
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return header;
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}
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static ImageDebugHeaderEntry ProcessEntry (ImageDebugHeaderEntry entry)
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{
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if (entry.Directory.Type != ImageDebugType.CodeView)
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return entry;
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var reader = new BinaryReader (new MemoryStream (entry.Data));
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var newDataStream = new MemoryStream ();
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var writer = new BinaryWriter (newDataStream);
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var sig = reader.ReadUInt32 ();
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if (sig != 0x53445352)
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return entry;
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writer.Write (sig); // RSDS
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writer.Write (reader.ReadBytes (16)); // MVID
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writer.Write (reader.ReadUInt32 ()); // Age
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var fullPath = Encoding.UTF8.GetString (reader.ReadBytes (entry.Data.Length - 1 - 24)); // length - ending \0 - RSDS+MVID+AGE
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writer.Write (Encoding.UTF8.GetBytes (Path.GetFileName (fullPath)));
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writer.Write ((byte) 0);
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var newData = newDataStream.ToArray ();
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var directory = entry.Directory;
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directory.SizeOfData = newData.Length;
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return new ImageDebugHeaderEntry (directory, newData);
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}
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public ISymbolReaderProvider GetReaderProvider () => _symbolWriter.GetReaderProvider ();
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public void Write (MethodDebugInformation info) => _symbolWriter.Write (info);
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public void Write () => _symbolWriter.Write ();
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public void Dispose () => _symbolWriter.Dispose ();
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#if NET
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public void Write (ICustomDebugInformationProvider provider) => _symbolWriter.Write (provider);
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#endif
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}
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}
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