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author | Michael Gottesman <mgottesman@apple.com> | 2013-07-07 01:52:55 +0000 |
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committer | Michael Gottesman <mgottesman@apple.com> | 2013-07-07 01:52:55 +0000 |
commit | 0a80c1240284c764c0f9cd043a2a18ff4152a203 (patch) | |
tree | 0180e95a679e83f462135f92bcd25675bb95d9d0 /lib/Transforms | |
parent | 09f8ca3986cbe89d897765926462476f345a25d0 (diff) | |
download | llvm-0a80c1240284c764c0f9cd043a2a18ff4152a203.tar.gz llvm-0a80c1240284c764c0f9cd043a2a18ff4152a203.tar.bz2 llvm-0a80c1240284c764c0f9cd043a2a18ff4152a203.tar.xz |
[objc-arc] Teach the ARC optimizer that objc_sync_enter/objc_sync_exit do not modify the ref count of an objc object and additionally are inert for modref purposes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185769 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
-rw-r--r-- | lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.cpp | 8 | ||||
-rw-r--r-- | lib/Transforms/ObjCARC/ObjCARCUtil.cpp | 2 |
2 files changed, 10 insertions, 0 deletions
diff --git a/lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.cpp b/lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.cpp index 46b2de7137..1a3f383d4c 100644 --- a/lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.cpp +++ b/lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.cpp @@ -150,6 +150,14 @@ ObjCARCAliasAnalysis::getModRefInfo(ImmutableCallSite CS, const Location &Loc) { break; } + // Handle special objective c calls defaulting to chaining. + const Function *F = CS.getCalledFunction(); + if (F) + return StringSwitch<AliasAnalysis::ModRefResult>(F->getName()) + .Case("objc_sync_start", NoModRef) + .Case("objc_sync_stop", NoModRef) + .Default(AliasAnalysis::getModRefInfo(CS, Loc)); + return AliasAnalysis::getModRefInfo(CS, Loc); } diff --git a/lib/Transforms/ObjCARC/ObjCARCUtil.cpp b/lib/Transforms/ObjCARC/ObjCARCUtil.cpp index 03e12d4fd7..415e76355d 100644 --- a/lib/Transforms/ObjCARC/ObjCARCUtil.cpp +++ b/lib/Transforms/ObjCARC/ObjCARCUtil.cpp @@ -112,6 +112,8 @@ InstructionClass llvm::objcarc::GetFunctionClass(const Function *F) { .Case("objc_retain_autorelease", IC_FusedRetainAutorelease) .Case("objc_retainAutorelease", IC_FusedRetainAutorelease) .Case("objc_retainAutoreleaseReturnValue",IC_FusedRetainAutoreleaseRV) + .Case("objc_sync_enter", IC_User) + .Case("objc_sync_exit", IC_User) .Default(IC_CallOrUser); // Argument is i8** |