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[DebugInfo] Handle same locations in DILocation::getMergedLocation

Authored by rob.lougher on Jan 10 2017, 11:25 AM.



Revision 289661 introduced the function DILocation::getMergedLocation for merging of debug locations. At the time is was simply a stub which always returned no location. This patch modifies getMergedLocation to handle the case where the two locations are the same or can't be discriminated.

The patch:

  • Changes getMergedLocation to use DILocation::canDiscriminate.
  • Fixes DILocation::canDiscriminate to add checks for directory, column and discriminator.
  • Updates SimplifyCFG HoistThenElseCodeToIf to remove redundant check.

The patch also adds an additional test to simplifycfg_sink_last_inst.ll - when the debug locations of the sunk instructions are the same we should now use that location for the common instruction.

OK to commit?


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rob.lougher retitled this revision from to [DebugInfo] Handle same locations in DILocation::getMergedLocation.
rob.lougher updated this object.
rob.lougher added reviewers: aprantl, dblaikie.
aprantl accepted this revision.Jan 12 2017, 9:46 AM
aprantl edited edge metadata.

Added a couple of inline comments. LGTM with these changes applied.

1303 ↗(On Diff #83826)

I would reorder these conditions so the most common mismatches come first.
Perhaps: Line, Column, Discriminator, Filename, Directory?

32 ↗(On Diff #83826)

This should be a separate NFC commit. No need to review it.

1579 ↗(On Diff #83826)

separate commit please

This revision is now accepted and ready to land.Jan 12 2017, 9:46 AM
This revision was automatically updated to reflect the committed changes.

Added a couple of inline comments. LGTM with these changes applied.

Thanks for the review! Changes made as requested and committed as 4 commits (one closing the review and 3 NFCs).