#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
MCELFStreamer::~MCELFStreamer() {
}
-void MCELFStreamer::InitSections() {
+void MCELFStreamer::InitSections(bool NoExecStack) {
// This emulates the same behavior of GNU as. This makes it easier
// to compare the output as the major sections are in the same order.
- SwitchSection(getContext().getObjectFileInfo()->getTextSection());
- EmitCodeAlignment(4, 0);
+ MCContext &Ctx = getContext();
+ SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
+ EmitCodeAlignment(4);
- SwitchSection(getContext().getObjectFileInfo()->getDataSection());
- EmitCodeAlignment(4, 0);
+ SwitchSection(Ctx.getObjectFileInfo()->getDataSection());
+ EmitCodeAlignment(4);
- SwitchSection(getContext().getObjectFileInfo()->getBSSSection());
- EmitCodeAlignment(4, 0);
+ SwitchSection(Ctx.getObjectFileInfo()->getBSSSection());
+ EmitCodeAlignment(4);
- SwitchSection(getContext().getObjectFileInfo()->getTextSection());
+ SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
+
+ if (NoExecStack)
+ SwitchSection(Ctx.getAsmInfo()->getNonexecutableStackSection(Ctx));
}
void MCELFStreamer::EmitLabel(MCSymbol *Symbol) {
MCELF::SetType(SD, ELF::STT_TLS);
}
-void MCELFStreamer::EmitDebugLabel(MCSymbol *Symbol) {
- EmitLabel(Symbol);
-}
-
void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
// Let the target do whatever target specific stuff it needs to do.
getAssembler().getBackend().handleAssemblerFlag(Flag);
MCSectionData *CurSection = getCurrentSectionData();
if (CurSection && CurSection->isBundleLocked())
report_fatal_error("Unterminated .bundle_lock when changing a section");
- const MCSymbol *Grp = static_cast<const MCSectionELF *>(Section)->getGroup();
+
+ MCAssembler &Asm = getAssembler();
+ auto *SectionELF = static_cast<const MCSectionELF *>(Section);
+ const MCSymbol *Grp = SectionELF->getGroup();
if (Grp)
- getAssembler().getOrCreateSymbolData(*Grp);
+ Asm.getOrCreateSymbolData(*Grp);
+
this->MCObjectStreamer::ChangeSection(Section, Subsection);
+ MCSymbol *SectionSymbol = getContext().getOrCreateSectionSymbol(*SectionELF);
+ if (SectionSymbol->isUndefined()) {
+ EmitLabel(SectionSymbol);
+ MCELF::SetType(Asm.getSymbolData(*SectionSymbol), ELF::STT_SECTION);
+ }
}
void MCELFStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
getAssembler().getOrCreateSymbolData(*Symbol);
- MCSymbolData &AliasSD = getAssembler().getOrCreateSymbolData(*Alias);
- AliasSD.setFlags(AliasSD.getFlags() | ELF_Other_Weakref);
- const MCExpr *Value = MCSymbolRefExpr::Create(Symbol, getContext());
+ const MCExpr *Value = MCSymbolRefExpr::Create(
+ Symbol, MCSymbolRefExpr::VK_WEAKREF, getContext());
Alias->setVariableValue(Value);
}
// If neither T1 < T2 nor T2 < T1 according to this ordering, use T2 (the user
// provided type).
static unsigned CombineSymbolTypes(unsigned T1, unsigned T2) {
- unsigned TypeOrdering[] = {ELF::STT_NOTYPE, ELF::STT_OBJECT, ELF::STT_FUNC,
- ELF::STT_GNU_IFUNC, ELF::STT_TLS};
- for (unsigned i = 0; i != array_lengthof(TypeOrdering); ++i) {
- if (T1 == TypeOrdering[i])
+ for (unsigned Type : {ELF::STT_NOTYPE, ELF::STT_OBJECT, ELF::STT_FUNC,
+ ELF::STT_GNU_IFUNC, ELF::STT_TLS}) {
+ if (T1 == Type)
return T2;
- if (T2 == TypeOrdering[i])
+ if (T2 == Type)
return T1;
}
return false;
case MCSA_NoDeadStrip:
- case MCSA_ELF_TypeGnuUniqueObject:
// Ignore for now.
break;
+ case MCSA_ELF_TypeGnuUniqueObject:
+ MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD), ELF::STT_OBJECT));
+ MCELF::SetBinding(SD, ELF::STB_GNU_UNIQUE);
+ SD.setExternal(true);
+ BindingExplicitlySet.insert(Symbol);
+ break;
+
case MCSA_Global:
MCELF::SetBinding(SD, ELF::STB_GLOBAL);
SD.setExternal(true);
MCELF::SetType(SD, ELF::STT_OBJECT);
if (MCELF::GetBinding(SD) == ELF_STB_Local) {
- const MCSection *Section = getAssembler().getContext().getELFSection(".bss",
- ELF::SHT_NOBITS,
- ELF::SHF_WRITE |
- ELF::SHF_ALLOC,
- SectionKind::getBSS());
+ const MCSection *Section = getAssembler().getContext().getELFSection(
+ ".bss", ELF::SHT_NOBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
AssignSection(Symbol, Section);
EmitCommonSymbol(Symbol, Size, ByteAlignment);
}
-void MCELFStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size) {
+void MCELFStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
+ const SMLoc &Loc) {
if (getCurrentSectionData()->isBundleLocked())
report_fatal_error("Emitting values inside a locked bundle is forbidden");
fixSymbolsInTLSFixups(Value);
- MCObjectStreamer::EmitValueImpl(Value, Size);
+ MCObjectStreamer::EmitValueImpl(Value, Size, Loc);
}
void MCELFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
void MCELFStreamer::EmitIdent(StringRef IdentString) {
const MCSection *Comment = getAssembler().getContext().getELFSection(
- ".comment", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS,
- SectionKind::getReadOnly(), 1, "");
+ ".comment", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
PushSection();
SwitchSection(Comment);
if (!SeenIdent) {
}
}
-void MCELFStreamer::EmitInstToFragment(const MCInst &Inst) {
- this->MCObjectStreamer::EmitInstToFragment(Inst);
+void MCELFStreamer::EmitInstToFragment(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ this->MCObjectStreamer::EmitInstToFragment(Inst, STI);
MCRelaxableFragment &F = *cast<MCRelaxableFragment>(getCurrentFragment());
for (unsigned i = 0, e = F.getFixups().size(); i != e; ++i)
fixSymbolsInTLSFixups(F.getFixups()[i].getValue());
}
-void MCELFStreamer::EmitInstToData(const MCInst &Inst) {
+void MCELFStreamer::EmitInstToData(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
MCAssembler &Assembler = getAssembler();
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
- Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
VecOS.flush();
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
} else {
DF = new MCDataFragment();
insert(DF);
- if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
- // If this is a new fragment created for a bundle-locked group, and the
- // group was marked as "align_to_end", set a flag in the fragment.
- DF->setAlignToBundleEnd(true);
- }
+ }
+ if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
+ // If this fragment is for a group marked "align_to_end", set a flag
+ // in the fragment. This can happen after the fragment has already been
+ // created if there are nested bundle_align groups and an inner one
+ // is the one marked align_to_end.
+ DF->setAlignToBundleEnd(true);
}
// We're now emitting an instruction in a bundle group, so this flag has
void MCELFStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
assert(AlignPow2 <= 30 && "Invalid bundle alignment");
MCAssembler &Assembler = getAssembler();
- if (Assembler.getBundleAlignSize() == 0 && AlignPow2 > 0)
- Assembler.setBundleAlignSize(1 << AlignPow2);
+ if (AlignPow2 > 0 && (Assembler.getBundleAlignSize() == 0 ||
+ Assembler.getBundleAlignSize() == 1U << AlignPow2))
+ Assembler.setBundleAlignSize(1U << AlignPow2);
else
- report_fatal_error(".bundle_align_mode should be only set once per file");
+ report_fatal_error(".bundle_align_mode cannot be changed once set");
}
void MCELFStreamer::EmitBundleLock(bool AlignToEnd) {
//
if (!getAssembler().isBundlingEnabled())
report_fatal_error(".bundle_lock forbidden when bundling is disabled");
- else if (SD->isBundleLocked())
- report_fatal_error("Nesting of .bundle_lock is forbidden");
+
+ if (!SD->isBundleLocked())
+ SD->setBundleGroupBeforeFirstInst(true);
SD->setBundleLockState(AlignToEnd ? MCSectionData::BundleLockedAlignToEnd :
MCSectionData::BundleLocked);
- SD->setBundleGroupBeforeFirstInst(true);
}
void MCELFStreamer::EmitBundleUnlock() {
}
void MCELFStreamer::FinishImpl() {
- EmitFrames(NULL, true);
+ EmitFrames(nullptr);
Flush();
this->MCObjectStreamer::FinishImpl();
}
-MCStreamer *llvm::createELFStreamer(MCContext &Context,
- MCTargetStreamer *Streamer,
- MCAsmBackend &MAB, raw_ostream &OS,
- MCCodeEmitter *CE, bool RelaxAll,
- bool NoExecStack) {
- MCELFStreamer *S = new MCELFStreamer(Context, Streamer, MAB, OS, CE);
+MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
+ raw_ostream &OS, MCCodeEmitter *CE,
+ bool RelaxAll) {
+ MCELFStreamer *S = new MCELFStreamer(Context, MAB, OS, CE);
if (RelaxAll)
S->getAssembler().setRelaxAll(true);
- if (NoExecStack)
- S->getAssembler().setNoExecStack(true);
return S;
}
llvm_unreachable("Generic ELF doesn't support this directive");
}
-MCSymbolData &MCELFStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
- return getAssembler().getOrCreateSymbolData(*Symbol);
-}
-
void MCELFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
llvm_unreachable("ELF doesn't support this directive");
}
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