From 38baeabb253f3e04d5b54bf834dbd9f5ebdc9e5c Mon Sep 17 00:00:00 2001
From: John McCall <rjmccall@apple.com>
Date: Fri, 13 Apr 2012 18:44:05 +0000
Subject: [PATCH] Don't enter cleanups for unreachable variables.  It's
 impossible to jump into these scopes, and the cleanup-entering code sometimes
 wants to do some operations first (e.g. a GEP), which can leave us with
 unparented IR.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154684 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGBlocks.cpp                 |  2 ++
 lib/CodeGen/CGDecl.cpp                   |  4 ++++
 test/CodeGenCXX/block-byref-cxx-objc.cpp | 10 ++++++++++
 3 files changed, 16 insertions(+)

diff --git a/lib/CodeGen/CGBlocks.cpp b/lib/CodeGen/CGBlocks.cpp
index 27bb4ef5d1..f8c7bcd4d7 100644
--- a/lib/CodeGen/CGBlocks.cpp
+++ b/lib/CodeGen/CGBlocks.cpp
@@ -491,6 +491,8 @@ static void computeBlockInfo(CodeGenModule &CGM, CodeGenFunction *CGF,
 /// a full-expression so that the block's cleanups are pushed at the
 /// right place in the stack.
 static void enterBlockScope(CodeGenFunction &CGF, BlockDecl *block) {
+  assert(CGF.HaveInsertPoint());
+
   // Allocate the block info and place it at the head of the list.
   CGBlockInfo &blockInfo =
     *new CGBlockInfo(block, CGF.CurFn->getName());
diff --git a/lib/CodeGen/CGDecl.cpp b/lib/CodeGen/CGDecl.cpp
index 8c154f0708..644777963b 100644
--- a/lib/CodeGen/CGDecl.cpp
+++ b/lib/CodeGen/CGDecl.cpp
@@ -1171,6 +1171,10 @@ void CodeGenFunction::EmitAutoVarCleanups(const AutoVarEmission &emission) {
   // If this was emitted as a global constant, we're done.
   if (emission.wasEmittedAsGlobal()) return;
 
+  // If we don't have an insertion point, we're done.  Sema prevents
+  // us from jumping into any of these scopes anyway.
+  if (!HaveInsertPoint()) return;
+
   const VarDecl &D = *emission.Variable;
 
   // Check the type for a cleanup.
diff --git a/test/CodeGenCXX/block-byref-cxx-objc.cpp b/test/CodeGenCXX/block-byref-cxx-objc.cpp
index 135e0c7551..30f1f074b9 100644
--- a/test/CodeGenCXX/block-byref-cxx-objc.cpp
+++ b/test/CodeGenCXX/block-byref-cxx-objc.cpp
@@ -23,3 +23,13 @@ int main()
 // CHECK: call void @_Block_object_assign
 // CHECK: define internal void @__destroy_helper_block_
 // CHECK: call void @_Block_object_dispose
+
+// rdar://problem/11135650
+namespace test1 {
+  struct A { int x; A(); ~A(); };
+
+  void test() {
+    return;
+    __block A a;
+  }
+}
-- 
2.40.0