/// <summary>
/// Fetches the source location (line number and file), given the relative virtual address (RVA)
/// of the location in the executable.
/// </summary>
public SourceLocation SourceLocationForRva(uint rva)
{
m_reader.m_log.WriteLine("SourceLocationForRva: looking up RVA {0:x} ", rva);
uint fetchCount;
IDiaEnumLineNumbers sourceLocs;
m_session.findLinesByRVA(rva, 0, out sourceLocs);
IDiaLineNumber sourceLoc;
sourceLocs.Next(1, out sourceLoc, out fetchCount);
if (fetchCount == 0)
{
m_reader.m_log.WriteLine("SourceLocationForRva: No lines for RVA {0:x} ", rva);
return null;
}
var buildTimeSourcePath = sourceLoc.sourceFile.fileName;
var lineNum = (int)sourceLoc.lineNumber;
var sourceFile = new SourceFile(this, sourceLoc.sourceFile);
var sourceLocation = new SourceLocation(sourceFile, (int)sourceLoc.lineNumber);
return sourceLocation;
}
/// <summary>
/// Managed code is shipped as IL, so RVA to NATIVE mapping can't be placed in the PDB. Instead
/// what is placed in the PDB is a mapping from a method's meta-data token and IL offset to source
/// line number. Thus if you have a metadata token and IL offset, you can again get a source location
/// </summary>
public SourceLocation SourceLocationForManagedCode(uint methodMetaDataToken, int ilOffset)
{
m_reader.m_log.WriteLine("SourceLocationForManagedCode: Looking up method token {0:x} ilOffset {1:x}", methodMetaDataToken, ilOffset);
IDiaSymbol methodSym;
m_session.findSymbolByToken(methodMetaDataToken, SymTagEnum.SymTagFunction, out methodSym);
if (methodSym == null)
{
m_reader.m_log.WriteLine("SourceLocationForManagedCode: No symbol for token {0:x} ilOffset {1:x}", methodMetaDataToken, ilOffset);
return null;
}
uint fetchCount;
IDiaEnumLineNumbers sourceLocs;
IDiaLineNumber sourceLoc;
// TODO FIX NOW, this code here is for debugging only turn if off when we are happy.
m_session.findLinesByRVA(methodSym.relativeVirtualAddress, (uint)(ilOffset + 256), out sourceLocs);
for (int i = 0; ;i++)
{
sourceLocs.Next(1, out sourceLoc, out fetchCount);
if (fetchCount == 0)
break;
if (i == 0)
m_reader.m_log.WriteLine("SourceLocationForManagedCode: source file: {0}", sourceLoc.sourceFile.fileName);
m_reader.m_log.WriteLine("SourceLocationForManagedCode: ILOffset {0:x} -> line {1}",
sourceLoc.relativeVirtualAddress - methodSym.relativeVirtualAddress, sourceLoc.lineNumber);
} // End TODO FIX NOW debugging code
// For managed code, the 'RVA' is a 'cumulative IL offset' (amount of IL bytes before this in the module)
// Thus you find the line number of a particular IL offset by adding the offset within the method to
// the cumulative IL offset of the start of the method.
m_session.findLinesByRVA(methodSym.relativeVirtualAddress + (uint)ilOffset, 256, out sourceLocs);
sourceLocs.Next(1, out sourceLoc, out fetchCount);
if (fetchCount == 0)
{
m_reader.m_log.WriteLine("SourceLocationForManagedCode: No lines for token {0:x} ilOffset {1:x}", methodMetaDataToken, ilOffset);
return null;
}
var sourceFile = new SourceFile(this, sourceLoc.sourceFile);
int lineNum;
// FEEFEE is some sort of illegal line number that is returned some time, It is better to ignore it.
// and take the next valid line
for(;;)
{
lineNum = (int)sourceLoc.lineNumber;
if (lineNum != 0xFEEFEE)
break;
sourceLocs.Next(1, out sourceLoc, out fetchCount);
if (fetchCount == 0)
break;
}
var sourceLocation = new SourceLocation(sourceFile, lineNum);
return sourceLocation;
}