GitLab

LLD creates '.Lswitch.table._Z...' symbols, which llvm-cxxfilt does not
properly demangle. This CL solves this problem. Details:
* Updates demangle.py to detect and demangle these symbols:
  * E.g., '.Lswitch.table._Z3foov' is demangled to
    'Switch table for foo()', which then becomes
    'foo() [Switch table]' downstream.
* Applies agrieve@'s idea to use the demangled names of switch tables
  to deduce object_path if missing (happens most of the time), by
  looking up the object_path of the symbol for the containing function.
  * Caveat: Some switch table symbols have suffices like ' (.123)',
    which need to be stripped.
  * For ~5% of cases for Chrome (with thin-LTO) there are multiple
    matching functions with different object files. For this, we
    simply arbitrate and take the first one found.

Bug: 923936
Change-Id: I30a6cdaabee2191b197ef05a643d704574e50344
Reviewed-on: https://chromium-review.googlesource.com/c/1481744
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634630}