[PATCH] D23651: [clang-rename] improve performance for rename-all

[Kirill Bobyrev via cfe-commits]

omtcyfz created this revision.
omtcyfz added reviewers: alexfh, vmiklos.
omtcyfz added a subscriber: cfe-commits.

As Miklos Vajna [[ http://lists.llvm.org/pipermail/cfe-dev/2016-August/050398.html | noticed ]] `clang-rename rename-all` has significant performance problems, which exposed the fact that clang-rename parses translation unit **N** times where **N** stands for the number of `{offset | old-name} -> new-name` pairs.

This patch prevents clang-rename from parsing translation unit multiple times.

https://reviews.llvm.org/D23651

Files:
  clang-rename/USRFindingAction.cpp
  clang-rename/USRFindingAction.h
  clang-rename/tool/ClangRename.cpp

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