From 207855cff9b4811004b9720f28a5bd0adf3784b7 Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Tue, 29 Jun 2010 21:24:00 +0000 Subject: Introducing the "linker_weak" linkage type. This will be used for Objective-C metadata types which should be marked as "weak", but which the linker will remove upon final linkage. For example, the "objc_msgSend_fixup_alloc" symbol is defined like this: .globl l_objc_msgSend_fixup_alloc .weak_definition l_objc_msgSend_fixup_alloc .section __DATA, __objc_msgrefs, coalesced .align 3 l_objc_msgSend_fixup_alloc: .quad _objc_msgSend_fixup .quad L_OBJC_METH_VAR_NAME_1 This is different from the "linker_private" linkage type, because it can't have the metadata defined with ".weak_definition". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107205 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/TargetLoweringObjectFileImpl.cpp | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'lib/CodeGen/TargetLoweringObjectFileImpl.cpp') diff --git a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp index 71ad3fb6f9..56420539b7 100644 --- a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp +++ b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp @@ -755,11 +755,12 @@ shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const { /// the directive emitted (this occurs in ObjC metadata). if (!GV) return false; - // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix. + // Check whether the mangled name has the "Private", "LinkerPrivate", or + // "LinkerWeak" prefix. if (GV->hasLocalLinkage() && !isa(GV)) { // FIXME: ObjC metadata is currently emitted as internal symbols that have - // \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and - // this horrible hack can go away. + // \1L and \1l prefixes on them. Fix them to be Private / LinkerPrivate / + // LinkerWeak and this horrible hack can go away. MCSymbol *Sym = Mang->getSymbol(GV); if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l') return false; -- cgit v1.2.3-18-g5258