[CodeGen][ObjC] Annotate retain-agnostic ObjC globals with attribute
'objc_arc_inert'
The attribute enables the ARC optimizer to delete ObjC ARC runtime calls
on the annotated globals (see https://reviews.llvm.org/D62433). We
currently only annotate global variables for string literals and global
blocks with the attribute.
rdar://problem/49839633
Differential Revision: https://reviews.llvm.org/D62831
llvm-svn: 363467
diff --git a/clang/lib/CodeGen/CGBlocks.cpp b/clang/lib/CodeGen/CGBlocks.cpp
index 2a317fc..c3ee712 100644
--- a/clang/lib/CodeGen/CGBlocks.cpp
+++ b/clang/lib/CodeGen/CGBlocks.cpp
@@ -1434,10 +1434,12 @@
if (CGM.getContext().getLangOpts().OpenCL)
AddrSpace = CGM.getContext().getTargetAddressSpace(LangAS::opencl_global);
- llvm::Constant *literal = fields.finishAndCreateGlobal(
+ llvm::GlobalVariable *literal = fields.finishAndCreateGlobal(
"__block_literal_global", blockInfo.BlockAlign,
/*constant*/ !IsWindows, llvm::GlobalVariable::InternalLinkage, AddrSpace);
+ literal->addAttribute("objc_arc_inert");
+
// Windows does not allow globals to be initialised to point to globals in
// different DLLs. Any such variables must run code to initialise them.
if (IsWindows) {