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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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13
lib/CodeGen/MachineFunction.cpp
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@ -410,17 +410,18 @@ unsigned MachineFunction::addLiveIn(unsigned PReg,
}
/// getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
/// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a
/// normal 'L' label is returned.
MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
bool isLinkerPrivate) const {
/// If isLinkerPrivate or isLinkerWeak is specified, an 'l' label is returned,
/// otherwise a normal 'L' label is returned.
MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
bool PassToLinker) const {
assert(JumpTableInfo && "No jump tables");
assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!");
const MCAsmInfo &MAI = *getTarget().getMCAsmInfo();
const char *Prefix = isLinkerPrivate ? MAI.getLinkerPrivateGlobalPrefix() :
MAI.getPrivateGlobalPrefix();
const char *Prefix = PassToLinker ?
MAI.getLinkerPrivateGlobalPrefix() :
MAI.getPrivateGlobalPrefix();
SmallString<60> Name;
raw_svector_ostream(Name)
<< Prefix << "JTI" << getFunctionNumber() << '_' << JTI;