CODEWITHSUNDEEP
c++symbolspdb-filescoff
Stefan Reinalter
Stefan Reinalter

Reputation: 51

Loading symbols for hotpatched code from .pdb or .obj

I'm currently working on a tool that allows me to change C++-code on the fly. Changed files are compiled in the background, loaded from the .obj, relocated & linked, and patched into the running process. This works fine so far.

However, I have been unable to load symbols for the new functions so that they are visible by the debugger. I have tried creating a virtual module using SymLoadModuleEx and adding symbols via SymAddSymbol, but that didn't work.

Ultimately, I would like to be able to add symbols and line information for the new functions. I could do that from either a .pdb file or the COFF info stored in the .obj (I have both), but I seem to be missing the crucial part that informs the debugger.

Is there a function for this that I simply missed? Or an undocumented code for RaiseException that is understood by the debugger (similar to naming a thread)?

I use Visual Studio, but any help in getting this to work in either the VS debugger or WinDBG is greatly appreciated.

Upvotes: 5

Views: 310

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