Changed CGObjCMac.cpp to add the marker externally_initialized to SELECTOR_REFERENCES in both the fragile and non-fragile API.

This is to ensure that GlobalOpt in LLVM does not attempt to look through a
selector reference to a method var name at compile time.

I also added a test/updated old tests that need to recognize the new keyword.

rdar://12580965.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174461 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 18 insertions, 8 deletions

diff --git a/lib/CodeGen/CGObjCMac.cpp b/lib/CodeGen/CGObjCMac.cpp
index 5ce6cd0ce5..2d67a77cfa 100644
--- a/lib/CodeGen/CGObjCMac.cpp
+++ b/lib/CodeGen/CGObjCMac.cpp
@@ -4415,6 +4415,7 @@ llvm::Value *CGObjCMac::EmitSelector(CGBuilderTy &Builder, Selector Sel,
       CreateMetadataVar("\01L_OBJC_SELECTOR_REFERENCES_", Casted,
                         "__OBJC,__message_refs,literal_pointers,no_dead_strip",
                         4, true);
+    Entry->setExternallyInitialized(true);
   }
 
   if (lvalue)
@@ -6761,6 +6762,7 @@ llvm::Value *CGObjCNonFragileABIMac::EmitSelector(CGBuilderTy &Builder,
       new llvm::GlobalVariable(CGM.getModule(), ObjCTypes.SelectorPtrTy, false,
                                llvm::GlobalValue::InternalLinkage,
                                Casted, "\01L_OBJC_SELECTOR_REFERENCES_");
+    Entry->setExternallyInitialized(true);
     Entry->setSection("__DATA, __objc_selrefs, literal_pointers, no_dead_strip");
     CGM.AddUsedGlobal(Entry);
   }
diff --git a/test/CodeGenObjC/boxing.m b/test/CodeGenObjC/boxing.m
index 9664298154..87ff0e7efb 100644
--- a/test/CodeGenObjC/boxing.m
+++ b/test/CodeGenObjC/boxing.m
@@ -54,17 +54,17 @@ typedef signed char BOOL;
 @end
 
 // CHECK: [[WithIntMeth:@".*"]] = internal global [15 x i8] c"numberWithInt:\00"
-// CHECK: [[WithIntSEL:@".*"]] = internal global i8* getelementptr inbounds ([15 x i8]* [[WithIntMeth]]
+// CHECK: [[WithIntSEL:@".*"]] = internal externally_initialized global i8* getelementptr inbounds ([15 x i8]* [[WithIntMeth]]
 // CHECK: [[WithCharMeth:@".*"]] = internal global [16 x i8] c"numberWithChar:\00"
-// CHECK: [[WithCharSEL:@".*"]] = internal global i8* getelementptr inbounds ([16 x i8]* [[WithCharMeth]]
+// CHECK: [[WithCharSEL:@".*"]] = internal externally_initialized global i8* getelementptr inbounds ([16 x i8]* [[WithCharMeth]]
 // CHECK: [[WithBoolMeth:@".*"]] = internal global [16 x i8] c"numberWithBool:\00"
-// CHECK: [[WithBoolSEL:@".*"]] = internal global i8* getelementptr inbounds ([16 x i8]* [[WithBoolMeth]]
+// CHECK: [[WithBoolSEL:@".*"]] = internal externally_initialized global i8* getelementptr inbounds ([16 x i8]* [[WithBoolMeth]]
 // CHECK: [[WithIntegerMeth:@".*"]] = internal global [19 x i8] c"numberWithInteger:\00"
-// CHECK: [[WithIntegerSEL:@".*"]] = internal global i8* getelementptr inbounds ([19 x i8]* [[WithIntegerMeth]]
+// CHECK: [[WithIntegerSEL:@".*"]] = internal externally_initialized global i8* getelementptr inbounds ([19 x i8]* [[WithIntegerMeth]]
 // CHECK: [[WithUnsignedIntegerMeth:@".*"]] = internal global [27 x i8] c"numberWithUnsignedInteger:\00"
-// CHECK: [[WithUnsignedIntegerSEL:@".*"]] = internal global i8* getelementptr inbounds ([27 x i8]* [[WithUnsignedIntegerMeth]]
+// CHECK: [[WithUnsignedIntegerSEL:@".*"]] = internal externally_initialized global i8* getelementptr inbounds ([27 x i8]* [[WithUnsignedIntegerMeth]]
 // CHECK: [[stringWithUTF8StringMeth:@".*"]] = internal global [22 x i8] c"stringWithUTF8String:\00"
-// CHECK: [[stringWithUTF8StringSEL:@".*"]] = internal global i8* getelementptr inbounds ([22 x i8]* [[stringWithUTF8StringMeth]]
+// CHECK: [[stringWithUTF8StringSEL:@".*"]] = internal externally_initialized global i8* getelementptr inbounds ([22 x i8]* [[stringWithUTF8StringMeth]]
 
 int main() {
   // CHECK: load i8** [[WithIntSEL]]
diff --git a/test/CodeGenObjC/externally-initialized-selectors.m b/test/CodeGenObjC/externally-initialized-selectors.m
new file mode 100644
index 0000000000..87a7c04cf7
--- /dev/null
+++ b/test/CodeGenObjC/externally-initialized-selectors.m
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -cc1 -fobjc-runtime=macosx-fragile-10.5 -o - -emit-llvm %s | FileCheck %s
+// RUN: %clang_cc1 -cc1 -o - -emit-llvm %s | FileCheck %s
+
+// CHECK: @"\01L_OBJC_SELECTOR_REFERENCES_" = internal externally_initialized global
+
+void test(id x) {
+  [x doSomething];
+}
diff --git a/test/CodeGenObjC/metadata-symbols-32.m b/test/CodeGenObjC/metadata-symbols-32.m
index 6d17e98a6f..e8d25129a7 100644
--- a/test/CodeGenObjC/metadata-symbols-32.m
+++ b/test/CodeGenObjC/metadata-symbols-32.m
@@ -23,7 +23,7 @@
 // RUN: grep '@"\\01L_OBJC_PROTOCOL_CLASS_METHODS_P" = internal global .*section "__OBJC,__cat_cls_meth,regular,no_dead_strip", align 4' %t
 // RUN: grep '@"\\01L_OBJC_PROTOCOL_INSTANCE_METHODS_P" = internal global .*section "__OBJC,__cat_inst_meth,regular,no_dead_strip", align 4' %t
 // RUN: grep '@"\\01L_OBJC_PROTOCOL_P" = internal global .*section "__OBJC,__protocol,regular,no_dead_strip", align 4' %t
-// RUN: grep '@"\\01L_OBJC_SELECTOR_REFERENCES_[0-9]*" = internal global .*section "__OBJC,__message_refs,literal_pointers,no_dead_strip", align 4' %t
+// RUN: grep '@"\\01L_OBJC_SELECTOR_REFERENCES_[0-9]*" = internal externally_initialized global .*section "__OBJC,__message_refs,literal_pointers,no_dead_strip", align 4' %t
 // RUN: grep '@"\\01L_OBJC_SYMBOLS" = internal global .*section "__OBJC,__symbols,regular,no_dead_strip", align 4' %t
 // RUN: grep '@"\\01l_OBJC_$_PROP_LIST_A" = internal global .*section "__OBJC,__property,regular,no_dead_strip", align 4' %t
 // RUN: grep "\.lazy_reference \.objc_class_name_J0" %t
diff --git a/test/CodeGenObjC/metadata-symbols-64.m b/test/CodeGenObjC/metadata-symbols-64.m
index 880fe2751d..27017b76a8 100644
--- a/test/CodeGenObjC/metadata-symbols-64.m
+++ b/test/CodeGenObjC/metadata-symbols-64.m
@@ -12,7 +12,7 @@
 // RUN: grep '@"\\01L_OBJC_METH_VAR_NAME_[0-9]*" = internal global .* section "__TEXT,__objc_methname,cstring_literals", align 1' %t
 // RUN: grep '@"\\01L_OBJC_METH_VAR_TYPE_[0-9]*" = internal global .* section "__TEXT,__objc_methtype,cstring_literals", align 1' %t
 // RUN: grep '@"\\01L_OBJC_PROP_NAME_ATTR_[0-9]*" = internal global .* section "__TEXT,__cstring,cstring_literals", align 1' %t
-// RUN: grep '@"\\01L_OBJC_SELECTOR_REFERENCES_*" = internal global .* section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"' %t
+// RUN: grep '@"\\01L_OBJC_SELECTOR_REFERENCES_*" = internal externally_initialized global .* section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"' %t
 // RUN: grep '@"\\01l_OBJC_$_CATEGORY_A_$_Cat" = internal global .* section "__DATA, __objc_const", align 8' %t
 // RUN: grep '@"\\01l_OBJC_$_CATEGORY_CLASS_METHODS_A_$_Cat" = internal global .* section "__DATA, __objc_const", align 8' %t
 // RUN: grep '@"\\01l_OBJC_$_CATEGORY_INSTANCE_METHODS_A_$_Cat" = internal global .* section "__DATA, __objc_const", align 8' %t