officially support post-process w/ USE_DRSYMS to redo callstacks with better symbols

From bruen...@google.com on June 09, 2011 08:35:35

xref issue #143 xref issue #290 xref issue #388

On Linux there is already built-in support for re-processing callstacks. This issue is about Windows.

I want to avoid the complexities of having drmem download pdb files online (DRi#450) or even in its front-end at startup.

xref Memcheck or Tsan: they require user to get symbols on his own.

Proposed model of acquiring symbols for users:

• use table for non-exported syscall wrapper #s (issue #388) so don't require system dll pdbs (unless have static malloc or string routines)
• print warning that don't have pdbs => issue #143, DRi#448
• print sym+offs if don't have line# => issue #290: -symbol_offsets
• provide tool to download syms for all dlls in results.txt that need them. tool also checks user32/kernel32 syscall #s vs drmem table.
• provide postprocess tool: have download-syms tool launch it.
• could have -batch-controlled msgbox pop up at end w/ notepad that offers to run the command for cmdline-challenged users

Original issue: http://code.google.com/p/drmemory/issues/detail?id=446