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namespace System.Workflow.ComponentModel.Compiler
{
using System;
using System.Runtime.InteropServices;
internal sealed class PDBReader : IDisposable
{
#region Data Members
private const string IMetaDataImportGuid = "7DAC8207-D3AE-4c75-9B67-92801A497D44";
private ISymUnmanagedReader symReader;
#endregion
#region Constructor and Dispose
public PDBReader(string assemblyPath)
{
object metaDataImport = null;
IMetaDataDispenser dispenser = null;
try
{
Guid metaDataImportIID = new Guid(IMetaDataImportGuid);
dispenser = (IMetaDataDispenser)(new MetaDataDispenser());
dispenser.OpenScope(assemblyPath, 0, ref metaDataImportIID, out metaDataImport);
this.symReader = (ISymUnmanagedReader)(new CorSymReader_SxS());
this.symReader.Initialize(metaDataImport, assemblyPath, null, null);
}
finally
{
// Release COM objects so that files don't remain locked.
if (metaDataImport != null)
Marshal.ReleaseComObject(metaDataImport);
if (dispenser != null)
Marshal.ReleaseComObject(dispenser);
}
}
~PDBReader()
{
Dispose();
}
void IDisposable.Dispose()
{
Dispose();
GC.SuppressFinalize(this);
}
private void Dispose()
{
if (this.symReader != null)
{
Marshal.ReleaseComObject(this.symReader);
this.symReader = null;
}
}
#endregion
#region Public methods
public void GetSourceLocationForOffset(uint methodDef, uint offset, out string fileLocation, out uint line, out uint column)
{
fileLocation = null;
line = 0;
column = 0;
ISymUnmanagedMethod symMethod = null;
ISymUnmanagedDocument[] documents = null;
uint sequencePointCount = 0;
try
{
symMethod = this.symReader.GetMethod(methodDef);
sequencePointCount = symMethod.GetSequencePointCount();
documents = new ISymUnmanagedDocument[sequencePointCount];
uint[] offsets = new uint[sequencePointCount];
uint[] lines = new uint[sequencePointCount];
uint[] columns = new uint[sequencePointCount];
uint[] endLines = new uint[sequencePointCount];
uint[] endColumns = new uint[sequencePointCount];
symMethod.GetSequencePoints(sequencePointCount, out sequencePointCount, offsets, documents, lines, columns, endLines, endColumns);
uint index = 1;
for (; index < sequencePointCount; index++)
{ if (offsets[index] > offset) break; }
index = index - 1;
// Work Around: AkashS - The SymReader returns bad line-column data for unconditional branch
// instructions. The line number is whacky and the column number is 0. Need to verify why this is so.
// We just look for a good sequence point data, it should be close enough in the source code.
while (columns[index] == 0 && index > 0)
index--;
while (index < sequencePointCount && columns[index] == 0)
index++;
// What more can we do?
if (index >= sequencePointCount || columns[index] == 0)
index = 0;
// End Work around
line = lines[index];
column = columns[index];
ISymUnmanagedDocument document = documents[index];
uint urlLength = 261;
string url = new string('\0', (int)urlLength);
document.GetURL(urlLength, out urlLength, url);
fileLocation = url.Substring(0, (int)urlLength - 1);
}
finally
{
// Release COM objects so that files don't remain locked.
for (uint i = 0; i < sequencePointCount; i++)
if (documents[i] != null)
Marshal.ReleaseComObject(documents[i]);
if (symMethod != null)
Marshal.ReleaseComObject(symMethod);
}
}
#endregion
}
#region Interop declarations
//
// Note:
// These interop declaration are sufficient for our purposes of reading the symbol information from
// the PDB. They are not complete otherwise!
//
[ComImport, Guid("0A3976C5-4529-4ef8-B0B0-42EED37082CD")]
internal class CorSymReader_SxS
{ }
[ComImport,
CoClass(typeof(CorSymReader_SxS)),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("B4CE6286-2A6B-3712-A3B7-1EE1DAD467B5")]
internal interface ISymUnmanagedReader
{
// NYI.
void GetDocument();
void GetDocuments();
void GetUserEntryPoint();
ISymUnmanagedMethod GetMethod(uint methodDef);
// NYI.
void GetMethodByVersion();
void GetVariables();
void GetGlobalVariables();
void GetMethodFromDocumentPosition();
void GetSymAttribute();
void GetNamespaces();
// Incomplete - We don't use the Stream
void Initialize([In, MarshalAs(UnmanagedType.IUnknown)] object metaDataImport, [In, MarshalAs(UnmanagedType.LPWStr)] string pdbPath, [In, MarshalAs(UnmanagedType.LPWStr)] string searchPath, [In, MarshalAs(UnmanagedType.IUnknown)] object stream);
// NYI.
void UpdateSymbolStore();
void ReplaceSymbolStore();
void GetSymbolStoreFileName();
void GetMethodsFromDocumentPosition();
void GetDocumentVersion();
void GetMethodVersion();
}
[ComImport,
InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("B62B923C-B500-3158-A543-24F307A8B7E1")]
internal interface ISymUnmanagedMethod
{
uint GetToken();
uint GetSequencePointCount();
// Incomplete - Don't need to define ISymUnmanagedScope.
object GetRootScope();
// Incomplete - Don't need to define ISymUnmanagedScope.
object GetScopeFromOffset(uint offset);
uint GetOffset([In, MarshalAs(UnmanagedType.IUnknown)] ISymUnmanagedDocument document, uint line, uint column);
void GetRanges([In, MarshalAs(UnmanagedType.IUnknown)] ISymUnmanagedDocument document, uint line, uint column, uint rangeCount, [Out] out uint actualRangeCount, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] ranges);
// NYI.
void GetParameters();
// NYI.
void GetNamespace();
void GetSourceStartEnd([In, Out, MarshalAs(UnmanagedType.LPArray)] ISymUnmanagedDocument[] documents, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] lines, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] columns, [Out, MarshalAs(UnmanagedType.Bool)] out bool positionsDefined);
void GetSequencePoints(uint pointsCount, [Out] out uint actualPointsCount, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] offsets, [In, Out, MarshalAs(UnmanagedType.LPArray)] ISymUnmanagedDocument[] documents, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] lines, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] columns, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] endLines, [In, Out, MarshalAs(UnmanagedType.LPArray)] uint[] endColumns);
}
[ComImport,
InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("40DE4037-7C81-3E1E-B022-AE1ABFF2CA08")]
internal interface ISymUnmanagedDocument
{
void GetURL(uint urlLength, [Out] out uint actualUrlLength, [In, Out, MarshalAs(UnmanagedType.LPWStr)] string url);
// The rest are NYI.
void GetDocumentType();
void GetLanguage();
void GetLanguageVendor();
void GetCheckSumAlgorithmId();
void GetCheckSum();
void FindClosestLine();
void HasEmbeddedSource();
void GetSourceLength();
void GetSourceRange();
}
[ComImport,
Guid("E5CB7A31-7512-11d2-89CE-0080C792E5D8")]
internal class MetaDataDispenser
{
}
[ComImport,
InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
CoClass(typeof(MetaDataDispenser)),
Guid("809C652E-7396-11d2-9771-00A0C9B4D50C")]
internal interface IMetaDataDispenser
{
// NYI
void DefineScope();
// Incomplete - I don't really need to define IMetaDataImport.
void OpenScope([In, MarshalAs(UnmanagedType.LPWStr)] string scope, uint flags, [In] ref Guid riid, [Out, MarshalAs(UnmanagedType.IUnknown)] out object unknown);
// NYI
void OpenScopeOnMemory();
}
#endregion
}
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