[PATCH] D50783: [CodeGen] Merge identical block descriptor global variables

[Akira Hatanaka via Phabricator via cfe-commits]

ahatanak created this revision.
ahatanak added reviewers: rjmccall, arphaman.
Herald added a subscriber: dexonsmith.

Currently, clang generates a new block descriptor global variable for each block literal. This patch merges block descriptors that are identical inside and across translation units using the same approach taken in r339438.

To enable merging identical block descriptors, the information of each member of a block descriptor is encoded into the block descriptor name. Also, the linkage of the block descriptor is `linkonce_odr` unless the copy or dispose helper is internal.


Repository:
  rC Clang

https://reviews.llvm.org/D50783

Files:
  lib/CodeGen/CGBlocks.cpp
  lib/CodeGen/CGObjCGNU.cpp
  lib/CodeGen/CGObjCMac.cpp
  lib/CodeGen/CGObjCRuntime.h
  test/CodeGenCXX/blocks.cpp
  test/CodeGenObjC/arc-blocks.m
  test/CodeGenObjC/fragile-arc.m
  test/CodeGenObjC/noescape.m

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