[PATCH] D20045: [ObjC][CodeGen] Remove an assert that is no longer correct.

[Akira Hatanaka via cfe-commits]

ahatanak created this revision.
ahatanak added reviewers: rjmccall, rsmith, manmanren.
ahatanak added a subscriber: cfe-commits.

The assert was committed in r183967. After r231508 made changes to promote constant temporaries to globals, the assert fires when a std::initializer_list is constructed using Objective-C string literals:

void foo1() {
  std::vector<NSString*> strs = {@"a", @"b"};
}

rdar://problem/25504992
rdar://problem/25955179

http://reviews.llvm.org/D20045

Files:
  lib/CodeGen/CGExpr.cpp
  test/CodeGenObjCXX/arc-cxx11-init-list.mm

Index: test/CodeGenObjCXX/arc-cxx11-init-list.mm
===================================================================
--- test/CodeGenObjCXX/arc-cxx11-init-list.mm
+++ test/CodeGenObjCXX/arc-cxx11-init-list.mm
@@ -1,5 +1,11 @@
 // RUN: %clang_cc1 -triple armv7-ios5.0 -std=c++11 -fobjc-arc -Os -emit-llvm -o - %s | FileCheck %s
 
+// CHECK: @[[STR0:.*]] = private unnamed_addr constant [5 x i8] c"str0\00", section "__TEXT,__cstring,cstring_literals"
+// CHECK: @[[UNNAMED_CFSTRING0:.*]] = private constant %struct.__NSConstantString_tag { i32* getelementptr inbounds ([0 x i32], [0 x i32]* @__CFConstantStringClassReference, i32 0, i32 0), i32 1992, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @[[STR0]], i32 0, i32 0), i32 4 }, section "__DATA,__cfstring"
+// CHECK: @[[STR1:.*]] = private unnamed_addr constant [5 x i8] c"str1\00", section "__TEXT,__cstring,cstring_literals"
+// CHECK: @[[UNNAMED_CFSTRING1:.*]] = private constant %struct.__NSConstantString_tag { i32* getelementptr inbounds ([0 x i32], [0 x i32]* @__CFConstantStringClassReference, i32 0, i32 0), i32 1992, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @[[STR1]], i32 0, i32 0), i32 4 }, section "__DATA,__cfstring"
+// CHECK: @[[REFTMP:.*]] = private constant [2 x i8*] [i8* bitcast (%struct.__NSConstantString_tag* @[[UNNAMED_CFSTRING0]] to i8*), i8* bitcast (%struct.__NSConstantString_tag* @[[UNNAMED_CFSTRING1]] to i8*)]
+
 typedef __SIZE_TYPE__ size_t;
 
 namespace std {
@@ -32,6 +38,17 @@
 // CHECK-NEXT: store i8* [[INSTANCE]], i8** [[CAST]],
 // CHECK: call void @objc_release(i8* {{.*}})
 
+std::initializer_list<id> foo1() {
+  return {@"str0", @"str1"};
+}
+
+// CHECK: define void @_Z4foo1v(%"class.std::initializer_list.0"* {{.*}} %[[AGG_RESULT:.*]])
+// CHECK: %[[BEGIN:.*]] = getelementptr inbounds %"class.std::initializer_list.0", %"class.std::initializer_list.0"* %[[AGG_RESULT]], i32 0, i32 0
+// CHECK: store i8** getelementptr inbounds ([2 x i8*], [2 x i8*]* @[[REFTMP]], i32 0, i32 0), i8*** %[[BEGIN]]
+// CHECK: %[[SIZE:.*]] = getelementptr inbounds %"class.std::initializer_list.0", %"class.std::initializer_list.0"* %[[AGG_RESULT]], i32 0, i32 1
+// CHECK: store i32 2, i32* %[[SIZE]]
+// CHECK: ret void
+
 void external();
 
 extern "C" void extended() {
@@ -49,4 +66,3 @@
 // CHECK: [[INSTANCE:%.*]] = {{.*}} call i8* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i8* (i8*, i8*)*)(i8* {{.*}}, i8* {{.*}})
 // CHECK-NEXT: store i8* [[INSTANCE]], i8** bitcast ([1 x %0*]* @_ZGR2il_ to i8**)
 // CHECK: {{.*}} call void @objc_autoreleasePoolPop(i8* [[POOL]])
-
Index: lib/CodeGen/CGExpr.cpp
===================================================================
--- lib/CodeGen/CGExpr.cpp
+++ lib/CodeGen/CGExpr.cpp
@@ -360,9 +360,10 @@
                            ConvertTypeForMem(E->getType())
                              ->getPointerTo(Object.getAddressSpace())),
                        Object.getAlignment());
-      // We should not have emitted the initializer for this temporary as a
-      // constant.
-      assert(!Var->hasInitializer());
+
+      if (Var->hasInitializer())
+        return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
+
       Var->setInitializer(CGM.EmitNullConstant(E->getType()));
     }
     LValue RefTempDst = MakeAddrLValue(Object, M->getType(),


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