[CodeGen] Merge identical block descriptor global variables.
Currently, clang generates a new block descriptor global variable for
each new block literal. This commit 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 size and signature of
the block and information about the captures are encoded into the name
of the block descriptor variable. Also, the block descriptor variable is
marked as linkonce_odr and unnamed_addr.
rdar://problem/42640703
Differential Revision: https://reviews.llvm.org/D50783
llvm-svn: 340041
diff --git a/clang/lib/CodeGen/CGObjCRuntime.h b/clang/lib/CodeGen/CGObjCRuntime.h
index 78d5aba..fa16c19 100644
--- a/clang/lib/CodeGen/CGObjCRuntime.h
+++ b/clang/lib/CodeGen/CGObjCRuntime.h
@@ -278,6 +278,10 @@
const CodeGen::CGBlockInfo &blockInfo) = 0;
virtual llvm::Constant *BuildRCBlockLayout(CodeGen::CodeGenModule &CGM,
const CodeGen::CGBlockInfo &blockInfo) = 0;
+ virtual std::string getRCBlockLayoutStr(CodeGen::CodeGenModule &CGM,
+ const CGBlockInfo &blockInfo) {
+ return {};
+ }
/// Returns an i8* which points to the byref layout information.
virtual llvm::Constant *BuildByrefLayout(CodeGen::CodeGenModule &CGM,