Alvin Wong 87a2dba14e [lldb] Fix loading DLL from some ramdisk on Windows ...

The WinAPI `GetFinalPathNameByHandle` is used to retrieve the DLL file
name from the HANDLE provided to `LOAD_DLL_DEBUG_EVENT` in the debug
loop. When this API fails, lldb will simply ignore that module.

Certain ramdisk (e.g. ImDisk) does not work with this API, which means
it is impossible to use lldb to debug a process which loads DLLs located
on this type of ramdisk. In order to make this work, we need to use a
fallback routine which involves creating a file mapping, using
`GetMappedFileName` to get a device path, then substitutes the device
path with its drive letter.

References:
* https://developercommunity.visualstudio.com/t/cannot-debug-program-when-compiled-to-ram-drive/43004#T-N109926
* https://github.com/jrfonseca/drmingw/issues/65
* https://docs.microsoft.com/en-us/windows/win32/memory/obtaining-a-file-name-from-a-file-handle

Reviewed By: labath

Differential Revision: https://reviews.llvm.org/D126657

2022-06-15 17:02:33 +03:00

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