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Implement the "linker_private_weak" linkage type. This will be used for

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Objective-C metadata types which should be marked as "weak", but which the
linker will remove upon final linkage. However, this linkage isn't specific to
Objective-C.

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".

Currently only supported on Darwin platforms.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107433 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2010-07-01 21:55:59 +00:00
parent 0f66d4be04
commit 5e721d7682
21 changed files with 90 additions and 44 deletions
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1
lib/Transforms/IPO/MergeFunctions.cpp
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@ -535,6 +535,7 @@ static LinkageCategory categorize(const Function *F) {
case GlobalValue::WeakAnyLinkage:
case GlobalValue::WeakODRLinkage:
case GlobalValue::ExternalWeakLinkage:
case GlobalValue::LinkerPrivateWeakLinkage:
return ExternalWeak;
case GlobalValue::ExternalLinkage: