-//===- lib/MC/MCMachOStreamer.cpp - Mach-O Object Output ------------===//
+//===-- MCMachOStreamer.cpp - MachO Streamer ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
-
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCLinkerOptimizationHint.h"
+#include "llvm/MC/MCMachOSymbolFlags.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCValue.h"
+#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+
using namespace llvm;
namespace {
-class MCMachOStreamer : public MCStreamer {
- MCAssembler Assembler;
+class MCMachOStreamer : public MCObjectStreamer {
+private:
+ /// LabelSections - true if each section change should emit a linker local
+ /// label for use in relocations for assembler local references. Obviates the
+ /// need for local relocations. False by default.
+ bool LabelSections;
+
+ bool DWARFMustBeAtTheEnd;
+ bool CreatedADWARFSection;
+
+ /// HasSectionLabel - map of which sections have already had a non-local
+ /// label emitted to them. Used so we don't emit extraneous linker local
+ /// labels in the middle of the section.
+ DenseMap<const MCSection*, bool> HasSectionLabel;
- MCSectionData *CurSectionData;
+ void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override;
- DenseMap<const MCSection*, MCSectionData*> SectionMap;
+ void EmitDataRegion(DataRegionData::KindTy Kind);
+ void EmitDataRegionEnd();
public:
- MCMachOStreamer(MCContext &Context, raw_ostream &_OS)
- : MCStreamer(Context), Assembler(_OS), CurSectionData(0) {}
- ~MCMachOStreamer() {}
+ MCMachOStreamer(MCContext &Context, MCAsmBackend &MAB, raw_ostream &OS,
+ MCCodeEmitter *Emitter, bool DWARFMustBeAtTheEnd, bool label)
+ : MCObjectStreamer(Context, MAB, OS, Emitter), LabelSections(label),
+ DWARFMustBeAtTheEnd(DWARFMustBeAtTheEnd), CreatedADWARFSection(false) {}
+
+ /// state management
+ void reset() override {
+ HasSectionLabel.clear();
+ MCObjectStreamer::reset();
+ }
/// @name MCStreamer Interface
/// @{
- virtual void SwitchSection(const MCSection *Section);
-
- virtual void EmitLabel(MCSymbol *Symbol);
-
- virtual void EmitAssemblerFlag(AssemblerFlag Flag);
+ void ChangeSection(const MCSection *Sect, const MCExpr *Subsect) override;
+ void EmitLabel(MCSymbol *Symbol) override;
+ void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol) override;
+ void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
+ void EmitLinkerOptions(ArrayRef<std::string> Options) override;
+ void EmitDataRegion(MCDataRegionType Kind) override;
+ void EmitVersionMin(MCVersionMinType Kind, unsigned Major,
+ unsigned Minor, unsigned Update) override;
+ void EmitThumbFunc(MCSymbol *Func) override;
+ bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
+ void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
+ void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) override;
+ void BeginCOFFSymbolDef(const MCSymbol *Symbol) override {
+ llvm_unreachable("macho doesn't support this directive");
+ }
+ void EmitCOFFSymbolStorageClass(int StorageClass) override {
+ llvm_unreachable("macho doesn't support this directive");
+ }
+ void EmitCOFFSymbolType(int Type) override {
+ llvm_unreachable("macho doesn't support this directive");
+ }
+ void EndCOFFSymbolDef() override {
+ llvm_unreachable("macho doesn't support this directive");
+ }
+ void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override {
+ llvm_unreachable("macho doesn't support this directive");
+ }
+ void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) override;
+ void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = nullptr,
+ uint64_t Size = 0, unsigned ByteAlignment = 0) override;
+ void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment = 0) override;
+
+ void EmitFileDirective(StringRef Filename) override {
+ // FIXME: Just ignore the .file; it isn't important enough to fail the
+ // entire assembly.
+
+ // report_fatal_error("unsupported directive: '.file'");
+ }
- virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
- bool MakeAbsolute = false);
+ void EmitIdent(StringRef IdentString) override {
+ llvm_unreachable("macho doesn't support this directive");
+ }
- virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
+ void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override {
+ getAssembler().getLOHContainer().addDirective(Kind, Args);
+ }
- virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
+ void FinishImpl() override;
+};
- virtual void EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value);
+} // end anonymous namespace.
- virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
- unsigned Pow2Alignment, bool IsLocal);
+static bool canGoAfterDWARF(const MCSectionMachO &MSec) {
+ // These sections are created by the assembler itself after the end of
+ // the .s file.
+ StringRef SegName = MSec.getSegmentName();
+ StringRef SecName = MSec.getSectionName();
- virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = NULL,
- unsigned Size = 0, unsigned Pow2Alignment = 0);
+ if (SegName == "__LD" && SecName == "__compact_unwind")
+ return true;
- virtual void EmitBytes(const StringRef &Data);
+ if (SegName == "__IMPORT") {
+ if (SecName == "__jump_table")
+ return true;
- virtual void EmitValue(const MCValue &Value, unsigned Size);
+ if (SecName == "__pointers")
+ return true;
+ }
- virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
- unsigned ValueSize = 1,
- unsigned MaxBytesToEmit = 0);
+ if (SegName == "__TEXT" && SecName == "__eh_frame")
+ return true;
- virtual void EmitValueToOffset(const MCValue &Offset,
- unsigned char Value = 0);
+ if (SegName == "__DATA" && SecName == "__nl_symbol_ptr")
+ return true;
- virtual void EmitInstruction(const MCInst &Inst);
+ return false;
+}
- virtual void Finish();
+void MCMachOStreamer::ChangeSection(const MCSection *Section,
+ const MCExpr *Subsection) {
+ // Change the section normally.
+ bool Created = MCObjectStreamer::changeSectionImpl(Section, Subsection);
+ const MCSectionMachO &MSec = *cast<MCSectionMachO>(Section);
+ StringRef SegName = MSec.getSegmentName();
+ if (SegName == "__DWARF")
+ CreatedADWARFSection = true;
+ else if (Created && DWARFMustBeAtTheEnd && !canGoAfterDWARF(MSec))
+ assert(!CreatedADWARFSection && "Creating regular section after DWARF");
+
+ // Output a linker-local symbol so we don't need section-relative local
+ // relocations. The linker hates us when we do that.
+ if (LabelSections && !HasSectionLabel[Section]) {
+ MCSymbol *Label = getContext().CreateLinkerPrivateTempSymbol();
+ EmitLabel(Label);
+ HasSectionLabel[Section] = true;
+ }
+}
- /// @}
-};
+void MCMachOStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
+ MCSymbol *EHSymbol) {
+ MCSymbolData &SD =
+ getAssembler().getOrCreateSymbolData(*Symbol);
+ if (SD.isExternal())
+ EmitSymbolAttribute(EHSymbol, MCSA_Global);
+ if (SD.getFlags() & SF_WeakDefinition)
+ EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
+ if (SD.isPrivateExtern())
+ EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
+}
-} // end anonymous namespace.
+void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
-void MCMachOStreamer::SwitchSection(const MCSection *Section) {
- assert(Section && "Cannot switch to a null section!");
+ // isSymbolLinkerVisible uses the section.
+ AssignSection(Symbol, getCurrentSection().first);
+ // We have to create a new fragment if this is an atom defining symbol,
+ // fragments cannot span atoms.
+ if (getAssembler().isSymbolLinkerVisible(*Symbol))
+ insert(new MCDataFragment());
+
+ MCObjectStreamer::EmitLabel(Symbol);
+
+ MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
+ // This causes the reference type flag to be cleared. Darwin 'as' was "trying"
+ // to clear the weak reference and weak definition bits too, but the
+ // implementation was buggy. For now we just try to match 'as', for
+ // diffability.
+ //
+ // FIXME: Cleanup this code, these bits should be emitted based on semantic
+ // properties, not on the order of definition, etc.
+ SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeMask);
+}
- if (Section != CurSection) {
- CurSection = Section;
- MCSectionData *&Entry = SectionMap[Section];
+void MCMachOStreamer::EmitDataRegion(DataRegionData::KindTy Kind) {
+ if (!getAssembler().getBackend().hasDataInCodeSupport())
+ return;
+ // Create a temporary label to mark the start of the data region.
+ MCSymbol *Start = getContext().CreateTempSymbol();
+ EmitLabel(Start);
+ // Record the region for the object writer to use.
+ DataRegionData Data = { Kind, Start, nullptr };
+ std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
+ Regions.push_back(Data);
+}
- if (!Entry)
- Entry = new MCSectionData(*Section, &Assembler);
+void MCMachOStreamer::EmitDataRegionEnd() {
+ if (!getAssembler().getBackend().hasDataInCodeSupport())
+ return;
+ std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
+ assert(!Regions.empty() && "Mismatched .end_data_region!");
+ DataRegionData &Data = Regions.back();
+ assert(!Data.End && "Mismatched .end_data_region!");
+ // Create a temporary label to mark the end of the data region.
+ Data.End = getContext().CreateTempSymbol();
+ EmitLabel(Data.End);
+}
- CurSectionData = Entry;
+void MCMachOStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
+ // Let the target do whatever target specific stuff it needs to do.
+ getAssembler().getBackend().handleAssemblerFlag(Flag);
+ // Do any generic stuff we need to do.
+ switch (Flag) {
+ case MCAF_SyntaxUnified: return; // no-op here.
+ case MCAF_Code16: return; // Change parsing mode; no-op here.
+ case MCAF_Code32: return; // Change parsing mode; no-op here.
+ case MCAF_Code64: return; // Change parsing mode; no-op here.
+ case MCAF_SubsectionsViaSymbols:
+ getAssembler().setSubsectionsViaSymbols(true);
+ return;
}
}
-void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
- assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- assert(CurSection && "Cannot emit before setting section!");
+void MCMachOStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
+ getAssembler().getLinkerOptions().push_back(Options);
+}
- llvm_unreachable("FIXME: Not yet implemented!");
+void MCMachOStreamer::EmitDataRegion(MCDataRegionType Kind) {
+ switch (Kind) {
+ case MCDR_DataRegion:
+ EmitDataRegion(DataRegionData::Data);
+ return;
+ case MCDR_DataRegionJT8:
+ EmitDataRegion(DataRegionData::JumpTable8);
+ return;
+ case MCDR_DataRegionJT16:
+ EmitDataRegion(DataRegionData::JumpTable16);
+ return;
+ case MCDR_DataRegionJT32:
+ EmitDataRegion(DataRegionData::JumpTable32);
+ return;
+ case MCDR_DataRegionEnd:
+ EmitDataRegionEnd();
+ return;
+ }
+}
- Symbol->setSection(*CurSection);
+void MCMachOStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
+ unsigned Minor, unsigned Update) {
+ getAssembler().setVersionMinInfo(Kind, Major, Minor, Update);
}
-void MCMachOStreamer::EmitAssemblerFlag(AssemblerFlag Flag) {
- llvm_unreachable("FIXME: Not yet implemented!");
+void MCMachOStreamer::EmitThumbFunc(MCSymbol *Symbol) {
+ // Remember that the function is a thumb function. Fixup and relocation
+ // values will need adjusted.
+ getAssembler().setIsThumbFunc(Symbol);
}
-void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol,
- const MCValue &Value,
- bool MakeAbsolute) {
- // Only absolute symbols can be redefined.
- assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
- "Cannot define a symbol twice!");
+bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+ MCSymbolAttr Attribute) {
+ // Indirect symbols are handled differently, to match how 'as' handles
+ // them. This makes writing matching .o files easier.
+ if (Attribute == MCSA_IndirectSymbol) {
+ // Note that we intentionally cannot use the symbol data here; this is
+ // important for matching the string table that 'as' generates.
+ IndirectSymbolData ISD;
+ ISD.Symbol = Symbol;
+ ISD.SectionData = getCurrentSectionData();
+ getAssembler().getIndirectSymbols().push_back(ISD);
+ return true;
+ }
- llvm_unreachable("FIXME: Not yet implemented!");
-}
+ // Adding a symbol attribute always introduces the symbol, note that an
+ // important side effect of calling getOrCreateSymbolData here is to register
+ // the symbol with the assembler.
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+
+ // The implementation of symbol attributes is designed to match 'as', but it
+ // leaves much to desired. It doesn't really make sense to arbitrarily add and
+ // remove flags, but 'as' allows this (in particular, see .desc).
+ //
+ // In the future it might be worth trying to make these operations more well
+ // defined.
+ switch (Attribute) {
+ case MCSA_Invalid:
+ case MCSA_ELF_TypeFunction:
+ case MCSA_ELF_TypeIndFunction:
+ case MCSA_ELF_TypeObject:
+ case MCSA_ELF_TypeTLS:
+ case MCSA_ELF_TypeCommon:
+ case MCSA_ELF_TypeNoType:
+ case MCSA_ELF_TypeGnuUniqueObject:
+ case MCSA_Hidden:
+ case MCSA_IndirectSymbol:
+ case MCSA_Internal:
+ case MCSA_Protected:
+ case MCSA_Weak:
+ case MCSA_Local:
+ return false;
+
+ case MCSA_Global:
+ SD.setExternal(true);
+ // This effectively clears the undefined lazy bit, in Darwin 'as', although
+ // it isn't very consistent because it implements this as part of symbol
+ // lookup.
+ //
+ // FIXME: Cleanup this code, these bits should be emitted based on semantic
+ // properties, not on the order of definition, etc.
+ SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeUndefinedLazy);
+ break;
+
+ case MCSA_LazyReference:
+ // FIXME: This requires -dynamic.
+ SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
+ if (Symbol->isUndefined())
+ SD.setFlags(SD.getFlags() | SF_ReferenceTypeUndefinedLazy);
+ break;
+
+ // Since .reference sets the no dead strip bit, it is equivalent to
+ // .no_dead_strip in practice.
+ case MCSA_Reference:
+ case MCSA_NoDeadStrip:
+ SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
+ break;
+
+ case MCSA_SymbolResolver:
+ SD.setFlags(SD.getFlags() | SF_SymbolResolver);
+ break;
+
+ case MCSA_PrivateExtern:
+ SD.setExternal(true);
+ SD.setPrivateExtern(true);
+ break;
+
+ case MCSA_WeakReference:
+ // FIXME: This requires -dynamic.
+ if (Symbol->isUndefined())
+ SD.setFlags(SD.getFlags() | SF_WeakReference);
+ break;
+
+ case MCSA_WeakDefinition:
+ // FIXME: 'as' enforces that this is defined and global. The manual claims
+ // it has to be in a coalesced section, but this isn't enforced.
+ SD.setFlags(SD.getFlags() | SF_WeakDefinition);
+ break;
+
+ case MCSA_WeakDefAutoPrivate:
+ SD.setFlags(SD.getFlags() | SF_WeakDefinition | SF_WeakReference);
+ break;
+ }
-void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
- SymbolAttr Attribute) {
- llvm_unreachable("FIXME: Not yet implemented!");
+ return true;
}
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
- llvm_unreachable("FIXME: Not yet implemented!");
+ // Encode the 'desc' value into the lowest implementation defined bits.
+ assert(DescValue == (DescValue & SF_DescFlagsMask) &&
+ "Invalid .desc value!");
+ getAssembler().getOrCreateSymbolData(*Symbol).setFlags(
+ DescValue & SF_DescFlagsMask);
}
-void MCMachOStreamer::EmitLocalSymbol(MCSymbol *Symbol, const MCValue &Value) {
- llvm_unreachable("FIXME: Not yet implemented!");
-}
+void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ // FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
-void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
- unsigned Pow2Alignment,
- bool IsLocal) {
- llvm_unreachable("FIXME: Not yet implemented!");
-}
+ AssignSection(Symbol, nullptr);
-void MCMachOStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
- unsigned Size, unsigned Pow2Alignment) {
- llvm_unreachable("FIXME: Not yet implemented!");
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ SD.setExternal(true);
+ SD.setCommon(Size, ByteAlignment);
}
-void MCMachOStreamer::EmitBytes(const StringRef &Data) {
- MCDataFragment *DF = new MCDataFragment(CurSectionData);
- DF->getContents().append(Data.begin(), Data.end());
+void MCMachOStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
+ // '.lcomm' is equivalent to '.zerofill'.
+ return EmitZerofill(getContext().getObjectFileInfo()->getDataBSSSection(),
+ Symbol, Size, ByteAlignment);
}
-void MCMachOStreamer::EmitValue(const MCValue &Value, unsigned Size) {
- new MCFillFragment(Value, Size, 1, CurSectionData);
-}
+void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {
+ MCSectionData &SectData = getAssembler().getOrCreateSectionData(*Section);
+
+ // The symbol may not be present, which only creates the section.
+ if (!Symbol)
+ return;
-void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
- int64_t Value, unsigned ValueSize,
- unsigned MaxBytesToEmit) {
- if (MaxBytesToEmit == 0)
- MaxBytesToEmit = ByteAlignment;
- new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
- CurSectionData);
+ // On darwin all virtual sections have zerofill type.
+ assert(Section->isVirtualSection() && "Section does not have zerofill type!");
- // Update the maximum alignment on the current section if necessary
- if (ByteAlignment > CurSectionData->getAlignment())
- CurSectionData->setAlignment(ByteAlignment);
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+
+ // Emit an align fragment if necessary.
+ if (ByteAlignment != 1)
+ new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectData);
+
+ MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
+ SD.setFragment(F);
+
+ AssignSection(Symbol, Section);
+
+ // Update the maximum alignment on the zero fill section if necessary.
+ if (ByteAlignment > SectData.getAlignment())
+ SectData.setAlignment(ByteAlignment);
}
-void MCMachOStreamer::EmitValueToOffset(const MCValue &Offset,
- unsigned char Value) {
- new MCOrgFragment(Offset, Value, CurSectionData);
+// This should always be called with the thread local bss section. Like the
+// .zerofill directive this doesn't actually switch sections on us.
+void MCMachOStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {
+ EmitZerofill(Section, Symbol, Size, ByteAlignment);
+ return;
}
-void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
- llvm_unreachable("FIXME: Not yet implemented!");
+void MCMachOStreamer::EmitInstToData(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
+ VecOS.flush();
+
+ // Add the fixups and data.
+ for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
+ Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
+ DF->getFixups().push_back(Fixups[i]);
+ }
+ DF->getContents().append(Code.begin(), Code.end());
}
-void MCMachOStreamer::Finish() {
- Assembler.Finish();
+void MCMachOStreamer::FinishImpl() {
+ EmitFrames(&getAssembler().getBackend());
+
+ // We have to set the fragment atom associations so we can relax properly for
+ // Mach-O.
+
+ // First, scan the symbol table to build a lookup table from fragments to
+ // defining symbols.
+ DenseMap<const MCFragment*, MCSymbolData*> DefiningSymbolMap;
+ for (MCSymbolData &SD : getAssembler().symbols()) {
+ if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()) &&
+ SD.getFragment()) {
+ // An atom defining symbol should never be internal to a fragment.
+ assert(SD.getOffset() == 0 && "Invalid offset in atom defining symbol!");
+ DefiningSymbolMap[SD.getFragment()] = &SD;
+ }
+ }
+
+ // Set the fragment atom associations by tracking the last seen atom defining
+ // symbol.
+ for (MCAssembler::iterator it = getAssembler().begin(),
+ ie = getAssembler().end(); it != ie; ++it) {
+ MCSymbolData *CurrentAtom = nullptr;
+ for (MCSectionData::iterator it2 = it->begin(),
+ ie2 = it->end(); it2 != ie2; ++it2) {
+ if (MCSymbolData *SD = DefiningSymbolMap.lookup(it2))
+ CurrentAtom = SD;
+ it2->setAtom(CurrentAtom);
+ }
+ }
+
+ this->MCObjectStreamer::FinishImpl();
}
-MCStreamer *llvm::createMachOStreamer(MCContext &Context, raw_ostream &OS) {
- return new MCMachOStreamer(Context, OS);
+MCStreamer *llvm::createMachOStreamer(MCContext &Context, MCAsmBackend &MAB,
+ raw_ostream &OS, MCCodeEmitter *CE,
+ bool RelaxAll, bool DWARFMustBeAtTheEnd,
+ bool LabelSections) {
+ MCMachOStreamer *S = new MCMachOStreamer(Context, MAB, OS, CE,
+ DWARFMustBeAtTheEnd, LabelSections);
+ if (RelaxAll)
+ S->getAssembler().setRelaxAll(true);
+ return S;
}
projects / oota-llvm.git / blobdiff