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

1 files changed, 7 insertions, 2 deletions

diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h
index 658967d..5132d39 100644
--- a/include/llvm/GlobalValue.h
+++ b/include/llvm/GlobalValue.h
@@ -39,7 +39,8 @@ public:
     AppendingLinkage,   ///< Special purpose, only applies to global arrays
     InternalLinkage,    ///< Rename collisions when linking (static functions).
     PrivateLinkage,     ///< Like Internal, but omit from symbol table.
-    LinkerPrivateLinkage, ///< Like Private, but linker removes.
+    LinkerPrivateLinkage, ///< Like private, but linker removes.
+    LinkerWeakLinkage,  ///< Like linker private, but weak.
     DLLImportLinkage,   ///< Function to be imported from DLL
     DLLExportLinkage,   ///< Function to be accessible from DLL.
     ExternalWeakLinkage,///< ExternalWeak linkage description.
@@ -132,7 +133,10 @@ public:
     return Linkage == PrivateLinkage;
   }
   static bool isLinkerPrivateLinkage(LinkageTypes Linkage) {
-    return Linkage==LinkerPrivateLinkage;
+    return Linkage == LinkerPrivateLinkage;
+  }
+  static bool isLinkerWeakLinkage(LinkageTypes Linkage) {
+    return Linkage == LinkerWeakLinkage;
   }
   static bool isLocalLinkage(LinkageTypes Linkage) {
     return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage) ||
@@ -187,6 +191,7 @@ public:
   bool hasInternalLinkage() const { return isInternalLinkage(Linkage); }
   bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); }
   bool hasLinkerPrivateLinkage() const { return isLinkerPrivateLinkage(Linkage); }
+  bool hasLinkerWeakLinkage() const { return isLinkerWeakLinkage(Linkage); }
   bool hasLocalLinkage() const { return isLocalLinkage(Linkage); }
   bool hasDLLImportLinkage() const { return isDLLImportLinkage(Linkage); }
   bool hasDLLExportLinkage() const { return isDLLExportLinkage(Linkage); }