Better support for accessing PDBs in IcorProfilerInfo

dotnet-461-ICorProfilerInfo.cpp

//Step 1) Set the COR_PRF_HIGH_IN_MEMORY_SYMBOLS_UPDATED flag so that your profiler will receive callbacks when symbols are loaded for modules.

// in production handle possible failing HRESULTs
ICorProfilerInfo5* pCorProfilerInfo5 = …
DWORD lowFlags = 0; // Most profilers will have other flags to set
DWORD highFlags = COR_PRF_HIGH_IN_MEMORY_SYMBOLS_UPDATED;
pCorProfilerInfo5->SetEventMask2(lowFlags, highFlags); 


// Step 2) Implement ICorProfilerCallback7 so that your profiler can handle the symbol load notification
HRESULT STDMETHODCALLTYPE ProfilerCallback::ModuleInMemorySymbolsUpdated(
    ModuleID moduleId)
{
    // in production handle possible failing HRESULTs
    ICorProfilerInfo7* pCorProfilerInfo7 = …
    DWORD length = 0;
    pCorProfilerInfo7->GetInMemorySymbolsLength(moduleId, &length); 
    BYTE* pSymbols = new BYTE[length];
    DWORD lengthRead = 0;
    pCorProfilerInfo7->ReadInMemorySymbols(moduleId, 0, pSymbols, length, &lengthRead);

    // Do whatever you want with the PDB data in pSymbols. These bytes will match
    // the byte array that was passed to Assembly.Load().
}