Drop support for creating $stubs.
They are created by ld64 since OS X 10.5.
llvm-svn: 274130
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
index 570165b..76c52ab 100644
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -142,8 +142,6 @@
bool doFinalization(Module &M) override;
void EmitStartOfAsmFile(Module &M) override;
-
- void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
};
} // end of anonymous namespace
@@ -1341,161 +1339,6 @@
OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
}
-static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
- // Remove $stub suffix, add $lazy_ptr.
- StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
- return Ctx.getOrCreateSymbol(NoStub + "$lazy_ptr");
-}
-
-static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
- // Add $tmp suffix to $stub, yielding $stub$tmp.
- return Ctx.getOrCreateSymbol(Sym->getName() + "$tmp");
-}
-
-void PPCDarwinAsmPrinter::
-EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
- bool isPPC64 = getDataLayout().getPointerSizeInBits() == 64;
-
- // Construct a local MCSubtargetInfo and shadow EmitToStreamer here.
- // This is because the MachineFunction won't exist (but have not yet been
- // freed) and since we're at the global level we can use the default
- // constructed subtarget.
- std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
- TM.getTargetTriple().str(), TM.getTargetCPU(),
- TM.getTargetFeatureString()));
- auto EmitToStreamer = [&STI] (MCStreamer &S, const MCInst &Inst) {
- S.EmitInstruction(Inst, *STI);
- };
-
- const TargetLoweringObjectFileMachO &TLOFMacho =
- static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
-
- // .lazy_symbol_pointer
- MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
-
- // Output stubs for dynamically-linked functions
- if (TM.getRelocationModel() == Reloc::PIC_) {
- MCSection *StubSection = OutContext.getMachOSection(
- "__TEXT", "__picsymbolstub1",
- MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 32,
- SectionKind::getText());
- for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
- OutStreamer->SwitchSection(StubSection);
- EmitAlignment(4);
-
- MCSymbol *Stub = Stubs[i].first;
- MCSymbol *RawSym = Stubs[i].second.getPointer();
- MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
- MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
-
- OutStreamer->EmitLabel(Stub);
- OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
-
- const MCExpr *Anon = MCSymbolRefExpr::create(AnonSymbol, OutContext);
- const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
- const MCExpr *Sub =
- MCBinaryExpr::createSub(LazyPtrExpr, Anon, OutContext);
-
- // mflr r0
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
- // bcl 20, 31, AnonSymbol
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
- OutStreamer->EmitLabel(AnonSymbol);
- // mflr r11
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
- // addis r11, r11, ha16(LazyPtr - AnonSymbol)
- const MCExpr *SubHa16 = PPCMCExpr::createHa(Sub, true, OutContext);
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::ADDIS)
- .addReg(PPC::R11)
- .addReg(PPC::R11)
- .addExpr(SubHa16));
- // mtlr r0
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
-
- // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
- // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
- const MCExpr *SubLo16 = PPCMCExpr::createLo(Sub, true, OutContext);
- EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
- .addReg(PPC::R12)
- .addExpr(SubLo16).addExpr(SubLo16)
- .addReg(PPC::R11));
- // mtctr r12
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
- // bctr
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
-
- OutStreamer->SwitchSection(LSPSection);
- OutStreamer->EmitLabel(LazyPtr);
- OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
-
- MCSymbol *DyldStubBindingHelper =
- OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
- if (isPPC64) {
- // .quad dyld_stub_binding_helper
- OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
- } else {
- // .long dyld_stub_binding_helper
- OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
- }
- }
- OutStreamer->AddBlankLine();
- return;
- }
-
- MCSection *StubSection = OutContext.getMachOSection(
- "__TEXT", "__symbol_stub1",
- MachO::S_SYMBOL_STUBS | MachO::S_ATTR_PURE_INSTRUCTIONS, 16,
- SectionKind::getText());
- for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
- MCSymbol *Stub = Stubs[i].first;
- MCSymbol *RawSym = Stubs[i].second.getPointer();
- MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
- const MCExpr *LazyPtrExpr = MCSymbolRefExpr::create(LazyPtr, OutContext);
-
- OutStreamer->SwitchSection(StubSection);
- EmitAlignment(4);
- OutStreamer->EmitLabel(Stub);
- OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
-
- // lis r11, ha16(LazyPtr)
- const MCExpr *LazyPtrHa16 =
- PPCMCExpr::createHa(LazyPtrExpr, true, OutContext);
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::LIS)
- .addReg(PPC::R11)
- .addExpr(LazyPtrHa16));
-
- // ldu r12, lo16(LazyPtr)(r11)
- // lwzu r12, lo16(LazyPtr)(r11)
- const MCExpr *LazyPtrLo16 =
- PPCMCExpr::createLo(LazyPtrExpr, true, OutContext);
- EmitToStreamer(*OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
- .addReg(PPC::R12)
- .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
- .addReg(PPC::R11));
-
- // mtctr r12
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
- // bctr
- EmitToStreamer(*OutStreamer, MCInstBuilder(PPC::BCTR));
-
- OutStreamer->SwitchSection(LSPSection);
- OutStreamer->EmitLabel(LazyPtr);
- OutStreamer->EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
-
- MCSymbol *DyldStubBindingHelper =
- OutContext.getOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
- if (isPPC64) {
- // .quad dyld_stub_binding_helper
- OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 8);
- } else {
- // .long dyld_stub_binding_helper
- OutStreamer->EmitSymbolValue(DyldStubBindingHelper, 4);
- }
- }
-
- OutStreamer->AddBlankLine();
-}
-
bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
bool isPPC64 = getDataLayout().getPointerSizeInBits() == 64;
@@ -1505,10 +1348,6 @@
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
- MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
- if (!Stubs.empty())
- EmitFunctionStubs(Stubs);
-
if (MAI->doesSupportExceptionHandling() && MMI) {
// Add the (possibly multiple) personalities to the set of global values.
// Only referenced functions get into the Personalities list.
@@ -1525,7 +1364,7 @@
}
// Output stubs for dynamically-linked functions.
- Stubs = MMIMacho.GetGVStubList();
+ MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetGVStubList();
// Output macho stubs for external and common global variables.
if (!Stubs.empty()) {