From c5792aa90fa45a1842f190c146f19e2c71ea6fbd Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@apple.com>
Date: Wed, 27 Feb 2019 18:17:16 +0000
Subject: Avoid needlessly copying a block to the heap when a block literal
 initializes a local auto variable or is assigned to a local auto variable
 that is declared in the scope that introduced the block literal.

rdar://problem/13289333

https://reviews.llvm.org/D58514

llvm-svn: 355012
---
 clang/lib/AST/Decl.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'clang/lib/AST/Decl.cpp')

diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 4f49bd79878..78501f5e3a9 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -4265,6 +4265,7 @@ BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
   setBlockMissingReturnType(true);
   setIsConversionFromLambda(false);
   setDoesNotEscape(false);
+  setCanAvoidCopyToHeap(false);
 }
 
 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
-- 
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