bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64;
// Darwin/PPC always uses mach-o.
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
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.
const std::vector<const Function*> &Personalities = MMI->getPersonalities();
for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
E = Personalities.end(); I != E; ++I) {
if (*I) {
MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
MachineModuleInfoImpl::StubValueTy &StubSym =
MMIMacho.getGVStubEntry(NLPSym);
StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
}
}
}
// Output stubs for dynamically-linked functions.
Stubs = MMIMacho.GetGVStubList();
// Output macho stubs for external and common global variables.
if (!Stubs.empty()) {
// Switch with ".non_lazy_symbol_pointer" directive.
OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
EmitAlignment(isPPC64 ? 3 : 2);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$stub:
OutStreamer.EmitLabel(Stubs[i].first);
// .indirect_symbol _foo
MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
if (MCSym.getInt())
// External to current translation unit.
OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
else
// Internal to current translation unit.
//
// When we place the LSDA into the TEXT section, the type info pointers
// need to be indirect and pc-rel. We accomplish this by using NLPs.
// However, sometimes the types are local to the file. So we need to
// fill in the value for the NLP in those cases.
OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
OutContext),
isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
Stubs = MMIMacho.GetHiddenGVStubList();
if (!Stubs.empty()) {
OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
EmitAlignment(isPPC64 ? 3 : 2);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$stub:
OutStreamer.EmitLabel(Stubs[i].first);
// .long _foo
OutStreamer.EmitValue(MCSymbolRefExpr::
Create(Stubs[i].second.getPointer(),
OutContext),
isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
// Funny Darwin hack: This flag tells the linker that no global symbols
// contain code that falls through to other global symbols (e.g. the obvious
// implementation of multiple entry points). If this doesn't occur, the
// linker can safely perform dead code stripping. Since LLVM never generates
// code that does this, it is always safe to set.
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
return AsmPrinter::doFinalization(M);
}
void PPCDarwinAsmPrinter::
EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64;
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
// .lazy_symbol_pointer
const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
// Output stubs for dynamically-linked functions
if (TM.getRelocationModel() == Reloc::PIC_) {
const MCSection *StubSection =
OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::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);
// FIXME: MCize this.
OutStreamer.EmitRawText(StringRef("\tmflr r0"));
OutStreamer.EmitRawText("\tbcl 20,31," + Twine(AnonSymbol->getName()));
OutStreamer.EmitLabel(AnonSymbol);
OutStreamer.EmitRawText(StringRef("\tmflr r11"));
OutStreamer.EmitRawText("\taddis r11,r11,ha16("+Twine(LazyPtr->getName())+
"-" + AnonSymbol->getName() + ")");
OutStreamer.EmitRawText(StringRef("\tmtlr r0"));
if (isPPC64)
OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
"-" + AnonSymbol->getName() + ")(r11)");
else
OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
"-" + AnonSymbol->getName() + ")(r11)");
OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
OutStreamer.EmitRawText(StringRef("\tbctr"));
OutStreamer.SwitchSection(LSPSection);
OutStreamer.EmitLabel(LazyPtr);
OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
if (isPPC64)
OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
else
OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
}
OutStreamer.AddBlankLine();
return;
}
const MCSection *StubSection =
OutContext.getMachOSection("__TEXT","__symbol_stub1",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::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);
OutStreamer.SwitchSection(StubSection);
EmitAlignment(4);
OutStreamer.EmitLabel(Stub);
OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
OutStreamer.EmitRawText("\tlis r11,ha16(" + Twine(LazyPtr->getName()) +")");
if (isPPC64)
OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
")(r11)");
else
OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
")(r11)");
OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
OutStreamer.EmitRawText(StringRef("\tbctr"));
OutStreamer.SwitchSection(LSPSection);
OutStreamer.EmitLabel(LazyPtr);
OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
if (isPPC64)
OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
else
OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
}
OutStreamer.AddBlankLine();
}
void Cse523AsmPrinter::EmitEndOfAsmFile(Module &M) {
if (Subtarget->isTargetMacho()) {
// All darwin targets use mach-o.
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
// Output stubs for dynamically-linked functions.
MachineModuleInfoMachO::SymbolListTy Stubs;
Stubs = MMIMacho.GetFnStubList();
if (!Stubs.empty()) {
const MCSection *TheSection =
OutContext.getMachOSection("__IMPORT", "__jump_table",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
5, SectionKind::getMetadata());
OutStreamer.SwitchSection(TheSection);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$stub:
OutStreamer.EmitLabel(Stubs[i].first);
// .indirect_symbol _foo
OutStreamer.EmitSymbolAttribute(Stubs[i].second.getPointer(),
MCSA_IndirectSymbol);
// hlt; hlt; hlt; hlt; hlt hlt = 0xf4.
const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4";
OutStreamer.EmitBytes(StringRef(HltInsts, 5));
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
// Output stubs for external and common global variables.
Stubs = MMIMacho.GetGVStubList();
if (!Stubs.empty()) {
const MCSection *TheSection =
OutContext.getMachOSection("__IMPORT", "__pointers",
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
OutStreamer.SwitchSection(TheSection);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$non_lazy_ptr:
OutStreamer.EmitLabel(Stubs[i].first);
// .indirect_symbol _foo
MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
OutStreamer.EmitSymbolAttribute(MCSym.getPointer(),
MCSA_IndirectSymbol);
// .long 0
if (MCSym.getInt())
// External to current translation unit.
OutStreamer.EmitIntValue(0, 4/*size*/);
else
// Internal to current translation unit.
//
// When we place the LSDA into the TEXT section, the type info
// pointers need to be indirect and pc-rel. We accomplish this by
// using NLPs. However, sometimes the types are local to the file. So
// we need to fill in the value for the NLP in those cases.
OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
OutContext), 4/*size*/);
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
Stubs = MMIMacho.GetHiddenGVStubList();
if (!Stubs.empty()) {
OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
EmitAlignment(2);
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
// L_foo$non_lazy_ptr:
OutStreamer.EmitLabel(Stubs[i].first);
// .long _foo
OutStreamer.EmitValue(MCSymbolRefExpr::
Create(Stubs[i].second.getPointer(),
OutContext), 4/*size*/);
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
SM.serializeToStackMapSection();
// Funny Darwin hack: This flag tells the linker that no global symbols
// contain code that falls through to other global symbols (e.g. the obvious
// implementation of multiple entry points). If this doesn't occur, the
// linker can safely perform dead code stripping. Since LLVM never
// generates code that does this, it is always safe to set.
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
}
if (Subtarget->isTargetWindows() && !Subtarget->isTargetCygMing() &&
MMI->usesVAFloatArgument()) {
StringRef SymbolName = Subtarget->is64Bit() ? "_fltused" : "__fltused";
MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName);
OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
}
if (Subtarget->isTargetCOFF()) {
Cse523COFFMachineModuleInfo &COFFMMI =
MMI->getObjFileInfo<Cse523COFFMachineModuleInfo>();
// Emit type information for external functions
typedef Cse523COFFMachineModuleInfo::externals_iterator externals_iterator;
for (externals_iterator I = COFFMMI.externals_begin(),
E = COFFMMI.externals_end();
I != E; ++I) {
OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_EXTERNAL);
OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
<< COFF::SCT_COMPLEX_TYPE_SHIFT);
OutStreamer.EndCOFFSymbolDef();
}
// Necessary for dllexport support
std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->hasDLLExportStorageClass())
DLLExportedFns.push_back(getSymbol(I));
for (Module::const_global_iterator I = M.global_begin(),
E = M.global_end(); I != E; ++I)
if (I->hasDLLExportStorageClass())
DLLExportedGlobals.push_back(getSymbol(I));
for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
I != E; ++I) {
const GlobalValue *GV = I;
if (!GV->hasDLLExportStorageClass())
continue;
while (const GlobalAlias *A = dyn_cast<GlobalAlias>(GV))
GV = A->getAliasedGlobal();
if (isa<Function>(GV))
DLLExportedFns.push_back(getSymbol(I));
else if (isa<GlobalVariable>(GV))
DLLExportedGlobals.push_back(getSymbol(I));
}
// Output linker support code for dllexported globals on windows.
if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
const TargetLoweringObjectFileCOFF &TLOFCOFF =
static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection());
SmallString<128> name;
for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i) {
if (Subtarget->isTargetWindows())
name = " /EXPORT:";
else
name = " -export:";
name += DLLExportedGlobals[i]->getName();
if (Subtarget->isTargetWindows())
name += ",DATA";
else
name += ",data";
OutStreamer.EmitBytes(name);
}
for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i) {
if (Subtarget->isTargetWindows())
name = " /EXPORT:";
else
name = " -export:";
name += DLLExportedFns[i]->getName();
OutStreamer.EmitBytes(name);
}
}
}
if (Subtarget->isTargetELF()) {
const TargetLoweringObjectFileELF &TLOFELF =
static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
// Output stubs for external and common global variables.
MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
if (!Stubs.empty()) {
OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
const DataLayout *TD = TM.getDataLayout();
for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
OutStreamer.EmitLabel(Stubs[i].first);
OutStreamer.EmitSymbolValue(Stubs[i].second.getPointer(),
TD->getPointerSize());
}
Stubs.clear();
}
}
}
void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
const Triple &TT = TM.getTargetTriple();
if (TT.isOSBinFormatMachO()) {
// All darwin targets use mach-o.
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
// Output stubs for dynamically-linked functions.
MachineModuleInfoMachO::SymbolListTy Stubs;
Stubs = MMIMacho.GetFnStubList();
if (!Stubs.empty()) {
MCSection *TheSection = OutContext.getMachOSection(
"__IMPORT", "__jump_table",
MachO::S_SYMBOL_STUBS | MachO::S_ATTR_SELF_MODIFYING_CODE |
MachO::S_ATTR_PURE_INSTRUCTIONS,
5, SectionKind::getMetadata());
OutStreamer->SwitchSection(TheSection);
for (const auto &Stub : Stubs) {
// L_foo$stub:
OutStreamer->EmitLabel(Stub.first);
// .indirect_symbol _foo
OutStreamer->EmitSymbolAttribute(Stub.second.getPointer(),
MCSA_IndirectSymbol);
// hlt; hlt; hlt; hlt; hlt hlt = 0xf4.
const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4";
OutStreamer->EmitBytes(StringRef(HltInsts, 5));
}
Stubs.clear();
OutStreamer->AddBlankLine();
}
// Output stubs for external and common global variables.
Stubs = MMIMacho.GetGVStubList();
if (!Stubs.empty()) {
MCSection *TheSection = OutContext.getMachOSection(
"__IMPORT", "__pointers", MachO::S_NON_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
OutStreamer->SwitchSection(TheSection);
for (auto &Stub : Stubs)
emitNonLazySymbolPointer(*OutStreamer, Stub.first, Stub.second);
Stubs.clear();
OutStreamer->AddBlankLine();
}
Stubs = MMIMacho.GetHiddenGVStubList();
if (!Stubs.empty()) {
MCSection *TheSection = OutContext.getMachOSection(
"__IMPORT", "__pointers", MachO::S_NON_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
OutStreamer->SwitchSection(TheSection);
for (auto &Stub : Stubs)
emitNonLazySymbolPointer(*OutStreamer, Stub.first, Stub.second);
Stubs.clear();
OutStreamer->AddBlankLine();
}
SM.serializeToStackMapSection();
FM.serializeToFaultMapSection();
// Funny Darwin hack: This flag tells the linker that no global symbols
// contain code that falls through to other global symbols (e.g. the obvious
// implementation of multiple entry points). If this doesn't occur, the
// linker can safely perform dead code stripping. Since LLVM never
// generates code that does this, it is always safe to set.
OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
}
if (TT.isKnownWindowsMSVCEnvironment() && MMI->usesVAFloatArgument()) {
StringRef SymbolName =
(TT.getArch() == Triple::x86_64) ? "_fltused" : "__fltused";
MCSymbol *S = MMI->getContext().getOrCreateSymbol(SymbolName);
OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
}
if (TT.isOSBinFormatCOFF()) {
const TargetLoweringObjectFileCOFF &TLOFCOFF =
static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
std::string Flags;
raw_string_ostream FlagsOS(Flags);
for (const auto &Function : M)
TLOFCOFF.emitLinkerFlagsForGlobal(FlagsOS, &Function, *Mang);
for (const auto &Global : M.globals())
TLOFCOFF.emitLinkerFlagsForGlobal(FlagsOS, &Global, *Mang);
for (const auto &Alias : M.aliases())
TLOFCOFF.emitLinkerFlagsForGlobal(FlagsOS, &Alias, *Mang);
FlagsOS.flush();
// Output collected flags.
if (!Flags.empty()) {
OutStreamer->SwitchSection(TLOFCOFF.getDrectveSection());
OutStreamer->EmitBytes(Flags);
}
SM.serializeToStackMapSection();
}
if (TT.isOSBinFormatELF()) {
SM.serializeToStackMapSection();
FM.serializeToFaultMapSection();
}
}
void PPCDarwinAsmPrinter::
EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
const TargetLoweringObjectFileMachO &TLOFMacho =
static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
// .lazy_symbol_pointer
const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
// Output stubs for dynamically-linked functions
if (TM.getRelocationModel() == Reloc::PIC_) {
const MCSection *StubSection =
OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::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);
// mflr r0
OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
// FIXME: MCize this.
OutStreamer.EmitRawText("\tbcl 20, 31, " + Twine(AnonSymbol->getName()));
OutStreamer.EmitLabel(AnonSymbol);
// mflr r11
OutStreamer.EmitInstruction(MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
// addis r11, r11, ha16(LazyPtr - AnonSymbol)
const MCExpr *Sub =
MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(LazyPtr, OutContext),
MCSymbolRefExpr::Create(AnonSymbol, OutContext),
OutContext);
OutStreamer.EmitInstruction(MCInstBuilder(PPC::ADDIS)
.addReg(PPC::R11)
.addReg(PPC::R11)
.addExpr(Sub));
// mtlr r0
OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
// ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
// lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
.addReg(PPC::R12)
.addExpr(Sub).addExpr(Sub)
.addReg(PPC::R11));
// mtctr r12
OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
// bctr
OutStreamer.EmitInstruction(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;
}
const MCSection *StubSection =
OutContext.getMachOSection("__TEXT","__symbol_stub1",
MCSectionMachO::S_SYMBOL_STUBS |
MCSectionMachO::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);
OutStreamer.SwitchSection(StubSection);
EmitAlignment(4);
OutStreamer.EmitLabel(Stub);
OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
// lis r11, ha16(LazyPtr)
const MCExpr *LazyPtrHa16 =
MCSymbolRefExpr::Create(LazyPtr, MCSymbolRefExpr::VK_PPC_DARWIN_HA16,
OutContext);
OutStreamer.EmitInstruction(MCInstBuilder(PPC::LIS)
.addReg(PPC::R11)
.addExpr(LazyPtrHa16));
const MCExpr *LazyPtrLo16 =
MCSymbolRefExpr::Create(LazyPtr, MCSymbolRefExpr::VK_PPC_DARWIN_LO16,
OutContext);
// ldu r12, lo16(LazyPtr)(r11)
// lwzu r12, lo16(LazyPtr)(r11)
OutStreamer.EmitInstruction(MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
.addReg(PPC::R12)
.addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
.addReg(PPC::R11));
// mtctr r12
OutStreamer.EmitInstruction(MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
// bctr
OutStreamer.EmitInstruction(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();
}
void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
if (Subtarget->isTargetMacho()) {
// All darwin targets use mach-o.
MachineModuleInfoMachO &MMIMacho =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
// Output stubs for dynamically-linked functions.
MachineModuleInfoMachO::SymbolListTy Stubs;
Stubs = MMIMacho.GetFnStubList();
if (!Stubs.empty()) {
const MCSection *TheSection =
OutContext.getMachOSection("__IMPORT", "__jump_table",
MachO::S_SYMBOL_STUBS |
MachO::S_ATTR_SELF_MODIFYING_CODE |
MachO::S_ATTR_PURE_INSTRUCTIONS,
5, SectionKind::getMetadata());
OutStreamer.SwitchSection(TheSection);
for (const auto &Stub : Stubs) {
// L_foo$stub:
OutStreamer.EmitLabel(Stub.first);
// .indirect_symbol _foo
OutStreamer.EmitSymbolAttribute(Stub.second.getPointer(),
MCSA_IndirectSymbol);
// hlt; hlt; hlt; hlt; hlt hlt = 0xf4.
const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4";
OutStreamer.EmitBytes(StringRef(HltInsts, 5));
}
Stubs.clear();
OutStreamer.AddBlankLine();
}
// Output stubs for external and common global variables.
Stubs = MMIMacho.GetGVStubList();
if (!Stubs.empty()) {
const MCSection *TheSection =
OutContext.getMachOSection("__IMPORT", "__pointers",
MachO::S_NON_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
OutStreamer.SwitchSection(TheSection);
for (auto &Stub : Stubs)
emitNonLazySymbolPointer(OutStreamer, Stub.first, Stub.second);
Stubs.clear();
OutStreamer.AddBlankLine();
}
Stubs = MMIMacho.GetHiddenGVStubList();
if (!Stubs.empty()) {
const MCSection *TheSection =
OutContext.getMachOSection("__IMPORT", "__pointers",
MachO::S_NON_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
OutStreamer.SwitchSection(TheSection);
for (auto &Stub : Stubs)
emitNonLazySymbolPointer(OutStreamer, Stub.first, Stub.second);
Stubs.clear();
OutStreamer.AddBlankLine();
}
SM.serializeToStackMapSection();
// Funny Darwin hack: This flag tells the linker that no global symbols
// contain code that falls through to other global symbols (e.g. the obvious
// implementation of multiple entry points). If this doesn't occur, the
// linker can safely perform dead code stripping. Since LLVM never
// generates code that does this, it is always safe to set.
OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
}
if (Subtarget->isTargetKnownWindowsMSVC() && MMI->usesVAFloatArgument()) {
StringRef SymbolName = Subtarget->is64Bit() ? "_fltused" : "__fltused";
MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName);
OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
}
if (Subtarget->isTargetCOFF()) {
// Necessary for dllexport support
std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
for (const auto &Function : M)
if (Function.hasDLLExportStorageClass())
DLLExportedFns.push_back(getSymbol(&Function));
for (const auto &Global : M.globals())
if (Global.hasDLLExportStorageClass())
DLLExportedGlobals.push_back(getSymbol(&Global));
for (const auto &Alias : M.aliases()) {
if (!Alias.hasDLLExportStorageClass())
continue;
if (Alias.getType()->getElementType()->isFunctionTy())
DLLExportedFns.push_back(getSymbol(&Alias));
else
DLLExportedGlobals.push_back(getSymbol(&Alias));
}
// Output linker support code for dllexported globals on windows.
if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
const TargetLoweringObjectFileCOFF &TLOFCOFF =
static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection());
for (auto & Symbol : DLLExportedGlobals)
GenerateExportDirective(Symbol, /*IsData=*/true);
for (auto & Symbol : DLLExportedFns)
GenerateExportDirective(Symbol, /*IsData=*/false);
}
}
if (Subtarget->isTargetELF()) {
const TargetLoweringObjectFileELF &TLOFELF =
static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
// Output stubs for external and common global variables.
MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
if (!Stubs.empty()) {
OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
const DataLayout *TD = TM.getDataLayout();
for (const auto &Stub : Stubs) {
OutStreamer.EmitLabel(Stub.first);
OutStreamer.EmitSymbolValue(Stub.second.getPointer(),
TD->getPointerSize());
}
Stubs.clear();
}
}
}
