[OBJC] Add attribute to mark Objective C class as non-lazy
A non-lazy class will be initialized eagerly when the Objective-C runtime is
loaded. This is required for certain system classes which have instances allocated in
non-standard ways, such as the classes for blocks and constant strings.
Adding this attribute is essentially equivalent to providing a trivial
+load method but avoids the (fairly small) load-time overheads associated
with defining and calling such a method.
Differential Revision: https://reviews.llvm.org/D56555
llvm-svn: 353116
diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 20b5a86..7822a95 100644
--- a/clang/lib/CodeGen/CGObjCMac.cpp
+++ b/clang/lib/CodeGen/CGObjCMac.cpp
@@ -6261,9 +6261,10 @@
return GV;
}
-bool
-CGObjCNonFragileABIMac::ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
- return OD->getClassMethod(GetNullarySelector("load")) != nullptr;
+bool CGObjCNonFragileABIMac::ImplementationIsNonLazy(
+ const ObjCImplDecl *OD) const {
+ return OD->getClassMethod(GetNullarySelector("load")) != nullptr ||
+ OD->getClassInterface()->hasAttr<ObjCNonLazyClassAttr>();
}
void CGObjCNonFragileABIMac::GetClassSizeInfo(const ObjCImplementationDecl *OID,