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Introducing the "linker_weak" linkage type. This will be used for Objective-C

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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
This commit is contained in:
Bill Wendling
2010-06-29 21:24:00 +00:00
parent 147b7cad2f
commit 207855cff9
26 changed files with 94 additions and 39 deletions
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9
include/llvm/GlobalValue.h
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@@ -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); }