NeXT: Add support for -fobjc-legacy-dispatch.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95005 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGObjCMac.cpp

@@ -21,6 +21,7 @@
 #include "clang/AST/RecordLayout.h"
 #include "clang/AST/StmtObjC.h"
 #include "clang/Basic/LangOptions.h"
+#include "clang/CodeGen/CodeGenOptions.h"
 
 #include "llvm/Intrinsics.h"
 #include "llvm/LLVMContext.h"
@@ -4224,6 +4225,9 @@ void CGObjCNonFragileABIMac::FinishNonFragileABIModule() {
 /// message dispatch call for all the rest.
 ///
 bool CGObjCNonFragileABIMac::LegacyDispatchedSelector(Selector Sel) {
+  if (CGM.getCodeGenOpts().ObjCLegacyDispatch)
+    return true;
+
   if (NonLegacyDispatchMethods.empty()) {
     NonLegacyDispatchMethods.insert(GetNullarySelector("alloc"));
     NonLegacyDispatchMethods.insert(GetNullarySelector("class"));

test/CodeGenObjC/objc2-legacy-dispatch.m

@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -fobjc-nonfragile-abi -emit-llvm -o - %s | FileCheck -check-prefix=CHECK_NEW_DISPATCH %s
+//
+// CHECK_NEW_DISPATCH: define void @f0
+// CHECK_NEW_DISPATCH: bitcast {{.*}}objc_msgSend_fixup_alloc
+// CHECK_NEW_DISPATCH: define void @f1
+// CHECK_NEW_DISPATCH: load {{.*}}OBJC_SELECTOR_REFERENCES
+//
+// RUN: %clang_cc1 -fobjc-nonfragile-abi -fobjc-legacy-dispatch -emit-llvm -o - %s | FileCheck -check-prefix=CHECK_OLD_DISPATCH %s
+//
+// CHECK_OLD_DISPATCH: define void @f0
+// CHECK_OLD_DISPATCH: load {{.*}}OBJC_SELECTOR_REFERENCES
+// CHECK_OLD_DISPATCH: define void @f1
+// CHECK_OLD_DISPATCH: load {{.*}}OBJC_SELECTOR_REFERENCES
+
+@interface A
++(id) alloc;
+-(int) im0;
+@end
+
+void f0(void) {
+  [A alloc];
+}
+
+void f1(A *a) {
+  [a im0];
+}