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Building .NET Coverage Tool

, 25 Aug 2009
This article is a walkthrough for building a .NET coverage tool
Coverage.NET_demo.zip
TestApp
TestApp.exe
TestApp.pdb
Tool
Coverage.Counter.dll
Coverage.exe
Mono.Cecil.dll
Mono.Tools.Pdb2Mdb.dll
Coverage.NET_src.zip
Coverage
Common
Instrument
Properties
Report
Coverage.Counter
Properties
Mono.Cecil
src
AUTHORS
ChangeLog
CodeGen
cecil-gen-attributes.rb
cecil-gen-sources.rb
cecil-gen-tests.rb
cecil-gen-types.rb
cecil-gen.rb
cecil-mig.rb
cecil-update-rev
templates
configure
default.build
Makefile
mono-cecil.pc.in
Mono.Cecil
Mono.Cecil.Binary
Mono.Cecil.Cil
Mono.Cecil.dll.sources
Mono.Cecil.Metadata
Mono.Cecil.Signatures
Mono.Xml
ChangeLog
NEWS
README
standalone.make
TODO
Mono.Tools.Pdb2Mdb
Properties
src
ChangeLog
LICENSE
Makefile
pdb2mdb.exe.sources
//
// MetadataReader.cs
//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// (C) 2005 Jb Evain
//
// 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.
//

namespace Mono.Cecil.Metadata {

	using System;
	using System.IO;
	using System.Text;

	using Mono.Cecil.Binary;

	sealed class MetadataReader : BaseMetadataVisitor {

		ImageReader m_ir;
		BinaryReader m_binaryReader;
		MetadataTableReader m_tableReader;
		MetadataRoot m_root;

		public MetadataTableReader TableReader {
			get { return m_tableReader; }
		}

		public MetadataReader (ImageReader brv)
		{
			m_ir = brv;
			m_binaryReader = brv.GetReader ();
		}

		public MetadataRoot GetMetadataRoot ()
		{
			return m_root;
		}

		public BinaryReader GetDataReader (RVA rva)
		{
			return m_ir.Image.GetReaderAtVirtualAddress (rva);
		}

		public override void VisitMetadataRoot (MetadataRoot root)
		{
			m_root = root;
			root.Header = new MetadataRoot.MetadataRootHeader ();
			root.Streams = new MetadataStreamCollection ();
		}

		public override void VisitMetadataRootHeader (MetadataRoot.MetadataRootHeader header)
		{
			long headpos = m_binaryReader.BaseStream.Position;

			header.Signature = m_binaryReader.ReadUInt32 ();

			if (header.Signature != MetadataRoot.MetadataRootHeader.StandardSignature)
				throw new MetadataFormatException ("Wrong magic number");

			header.MajorVersion = m_binaryReader.ReadUInt16 ();
			header.MinorVersion = m_binaryReader.ReadUInt16 ();
			header.Reserved = m_binaryReader.ReadUInt32 ();

			// read version
			uint length = m_binaryReader.ReadUInt32 ();
			if (length != 0) {
				long pos = m_binaryReader.BaseStream.Position;

				byte [] version, buffer = new byte [length];
				int read = 0;
				while (read < length) {
					byte cur = (byte)m_binaryReader.ReadSByte ();
					if (cur == 0)
						break;
					buffer [read++] = cur;
				}
				version = new byte [read];
				Buffer.BlockCopy (buffer, 0, version, 0, read);
				header.Version = Encoding.UTF8.GetString (version, 0, version.Length);

				pos += length - headpos + 3;
				pos &= ~3;
				pos += headpos;

				m_binaryReader.BaseStream.Position = pos;
			} else
				header.Version = string.Empty;

			header.Flags = m_binaryReader.ReadUInt16 ();
			header.Streams = m_binaryReader.ReadUInt16 ();
		}

		public override void VisitMetadataStreamCollection (MetadataStreamCollection coll)
		{
			for (int i = 0; i < m_root.Header.Streams; i++)
				coll.Add (new MetadataStream ());
		}

		public override void VisitMetadataStreamHeader (MetadataStream.MetadataStreamHeader header)
		{
			header.Offset = m_binaryReader.ReadUInt32 ();
			header.Size = m_binaryReader.ReadUInt32 ();

			StringBuilder buffer = new StringBuilder ();
			while (true) {
				char cur = (char) m_binaryReader.ReadSByte ();
				if (cur == '\0')
					break;
				buffer.Append (cur);
			}
			header.Name = buffer.ToString ();
			if (header.Name.Length == 0)
				throw new MetadataFormatException ("Invalid stream name");

			long rootpos = m_root.GetImage ().ResolveVirtualAddress (
				m_root.GetImage ().CLIHeader.Metadata.VirtualAddress);

			long curpos = m_binaryReader.BaseStream.Position;

			if (header.Size != 0)
				curpos -= rootpos;

			curpos += 3;
			curpos &= ~3;

			if (header.Size != 0)
				curpos += rootpos;

			m_binaryReader.BaseStream.Position = curpos;

			header.Stream.Heap = MetadataHeap.HeapFactory (header.Stream);
		}

		public override void VisitGuidHeap (GuidHeap heap)
		{
			VisitHeap (heap);
		}

		public override void VisitStringsHeap (StringsHeap heap)
		{
			VisitHeap (heap);

			if (heap.Data.Length < 1 && heap.Data [0] != 0)
				throw new MetadataFormatException ("Malformed #Strings heap");

			heap [(uint) 0] = string.Empty;
		}

		public override void VisitTablesHeap (TablesHeap heap)
		{
			VisitHeap (heap);
			heap.Tables = new TableCollection (heap);

			BinaryReader br = new BinaryReader (new MemoryStream (heap.Data));
			try {
				heap.Reserved = br.ReadUInt32 ();
				heap.MajorVersion = br.ReadByte ();
				heap.MinorVersion = br.ReadByte ();
				heap.HeapSizes = br.ReadByte ();
				heap.Reserved2 = br.ReadByte ();
				heap.Valid = br.ReadInt64 ();
				heap.Sorted = br.ReadInt64 ();
			} finally {
				// COMPACT FRAMEWORK NOTE: BinaryReader is not IDisposable
				br.Close ();
			}
		}

		public override void VisitBlobHeap (BlobHeap heap)
		{
			VisitHeap (heap);
		}

		public override void VisitUserStringsHeap (UserStringsHeap heap)
		{
			VisitHeap (heap);
		}

		void VisitHeap (MetadataHeap heap)
		{
			long cursor = m_binaryReader.BaseStream.Position;

			m_binaryReader.BaseStream.Position = m_root.GetImage ().ResolveVirtualAddress (
				m_root.GetImage ().CLIHeader.Metadata.VirtualAddress)
				+ heap.GetStream ().Header.Offset;

			heap.Data = m_binaryReader.ReadBytes ((int) heap.GetStream ().Header.Size);

			m_binaryReader.BaseStream.Position = cursor;
		}

		void SetHeapIndexSize (MetadataHeap heap, byte flag)
		{
			if (heap == null)
				return;
			TablesHeap th = m_root.Streams.TablesHeap;
			heap.IndexSize = ((th.HeapSizes & flag) > 0) ? 4 : 2;
		}

		public override void TerminateMetadataRoot (MetadataRoot root)
		{
			SetHeapIndexSize (root.Streams.StringsHeap, 0x01);
			SetHeapIndexSize (root.Streams.GuidHeap, 0x02);
			SetHeapIndexSize (root.Streams.BlobHeap, 0x04);
			m_tableReader = new MetadataTableReader (this);
			root.Streams.TablesHeap.Tables.Accept (m_tableReader);
		}
	}
}

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License

This article, along with any associated source code and files, is licensed under The MIT License

About the Author

Sergiy Sakharov
Software Developer (Senior)
United Kingdom United Kingdom
No Biography provided

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