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Add clang.arc.used to ModuleHasARC so ARC always runs if said call is present in a module. 

clang.arc.used is an interesting call for ARC since ObjCARCContract
needs to run to remove said intrinsic to avoid a linker error (since the
call does not exist).

llvm-svn: 178369
This commit is contained in:
Michael Gottesman 2013-03-29 21:15:23 +00:00
parent add82b3c75
commit 3b8f877860
2 changed files with 18 additions and 1 deletions
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3
llvm/lib/Transforms/ObjCARC/ObjCARC.h
View File

@ -64,7 +64,8 @@ static inline bool ModuleHasARC(const Module &M) {
M.getNamedValue("objc_copyWeak") ||
M.getNamedValue("objc_retainedObject") ||
M.getNamedValue("objc_unretainedObject") ||
M.getNamedValue("objc_unretainedPointer");
M.getNamedValue("objc_unretainedPointer") ||
M.getNamedValue("clang.arc.use");
}
/// \enum InstructionClass

16
llvm/test/Transforms/ObjCARC/clang-arc-used-intrinsic-removed-if-isolated.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: opt -objc-arc-contract -S < %s | FileCheck %s
; This file makes sure that clang.arc.used is removed even if no other ARC
; interesting calls are in the module.
declare void @clang.arc.use(...) nounwind
; Kill calls to @clang.arc.use(...)
; CHECK: define void @test0(
; CHECK-NOT: clang.arc.use
; CHECK: }
define void @test0(i8* %a, i8* %b) {
call void (...)* @clang.arc.use(i8* %a, i8* %b) nounwind
ret void
}