-//===- 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/MCContext.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/MCObjectFileInfo.h"
+#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCValue.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCSymbolMachO.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 {
- /// SymbolFlags - We store the value for the 'desc' symbol field in the lowest
- /// 16 bits of the implementation defined flags.
- enum SymbolFlags { // See <mach-o/nlist.h>.
- SF_DescFlagsMask = 0xFFFF,
-
- // Reference type flags.
- SF_ReferenceTypeMask = 0x0007,
- SF_ReferenceTypeUndefinedNonLazy = 0x0000,
- SF_ReferenceTypeUndefinedLazy = 0x0001,
- SF_ReferenceTypeDefined = 0x0002,
- SF_ReferenceTypePrivateDefined = 0x0003,
- SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
- SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
-
- // Other 'desc' flags.
- SF_NoDeadStrip = 0x0020,
- SF_WeakReference = 0x0040,
- SF_WeakDefinition = 0x0080
- };
-
+class MCMachOStreamer : public MCObjectStreamer {
private:
- MCAssembler Assembler;
- MCCodeEmitter *Emitter;
- MCSectionData *CurSectionData;
- DenseMap<const MCSection*, MCSectionData*> SectionMap;
- DenseMap<const MCSymbol*, MCSymbolData*> SymbolMap;
-
-private:
- MCFragment *getCurrentFragment() const {
- assert(CurSectionData && "No current section!");
-
- if (!CurSectionData->empty())
- return &CurSectionData->getFragmentList().back();
-
- return 0;
- }
+ /// 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;
- MCSectionData &getSectionData(const MCSection &Section) {
- MCSectionData *&Entry = SectionMap[&Section];
+ bool DWARFMustBeAtTheEnd;
+ bool CreatedADWARFSection;
- if (!Entry)
- Entry = new MCSectionData(Section, &Assembler);
+ /// 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;
- return *Entry;
- }
-
- MCSymbolData &getSymbolData(const MCSymbol &Symbol) {
- MCSymbolData *&Entry = SymbolMap[&Symbol];
+ void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override;
- if (!Entry)
- Entry = new MCSymbolData(Symbol, 0, 0, &Assembler);
-
- return *Entry;
- }
+ void EmitDataRegion(DataRegionData::KindTy Kind);
+ void EmitDataRegionEnd();
public:
- MCMachOStreamer(MCContext &Context, raw_ostream &_OS, MCCodeEmitter *_Emitter)
- : MCStreamer(Context), Assembler(Context, _OS), Emitter(_Emitter),
- CurSectionData(0) {}
- ~MCMachOStreamer() {}
-
- const MCExpr *AddValueSymbols(const MCExpr *Value) {
- switch (Value->getKind()) {
- case MCExpr::Target: assert(0 && "Can't handle target exprs yet!");
- case MCExpr::Constant:
- break;
-
- case MCExpr::Binary: {
- const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
- AddValueSymbols(BE->getLHS());
- AddValueSymbols(BE->getRHS());
- break;
- }
-
- case MCExpr::SymbolRef:
- getSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
- break;
-
- case MCExpr::Unary:
- AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
- break;
- }
-
- return Value;
+ MCMachOStreamer(MCContext &Context, MCAsmBackend &MAB, raw_pwrite_stream &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(MCAssemblerFlag Flag);
- virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
- virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
- virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
- virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment);
- virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
- assert(0 && "macho doesn't support this directive");
+ void ChangeSection(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");
}
- virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
- assert(0 && "macho doesn't support this directive");
+ void EmitCOFFSymbolType(int Type) override {
+ llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
- unsigned Size = 0, unsigned ByteAlignment = 0);
- virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
- virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
- virtual void EmitGPRel32Value(const MCExpr *Value) {
- assert(0 && "macho doesn't support this directive");
+ void EndCOFFSymbolDef() override {
+ llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
- unsigned ValueSize = 1,
- unsigned MaxBytesToEmit = 0);
- virtual void EmitValueToOffset(const MCExpr *Offset,
- unsigned char Value = 0);
-
- virtual void EmitFileDirective(StringRef Filename) {
- errs() << "FIXME: MCMachoStreamer:EmitFileDirective not implemented\n";
+ void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) override;
+ void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
+ uint64_t Size = 0, unsigned ByteAlignment = 0) override;
+ void EmitTBSSSymbol(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 EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
- errs() << "FIXME: MCMachoStreamer:EmitDwarfFileDirective not implemented\n";
+
+ void EmitIdent(StringRef IdentString) override {
+ llvm_unreachable("macho doesn't support this directive");
+ }
+
+ void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override {
+ getAssembler().getLOHContainer().addDirective(Kind, Args);
}
-
- virtual void EmitInstruction(const MCInst &Inst);
- virtual void Finish();
- /// @}
+ void FinishImpl() override;
};
} // end anonymous namespace.
-void MCMachOStreamer::SwitchSection(const MCSection *Section) {
- assert(Section && "Cannot switch to a null section!");
-
- // If already in this section, then this is a noop.
- if (Section == CurSection) return;
+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();
+
+ if (SegName == "__LD" && SecName == "__compact_unwind")
+ return true;
+
+ if (SegName == "__IMPORT") {
+ if (SecName == "__jump_table")
+ return true;
+
+ if (SecName == "__pointers")
+ return true;
+ }
+
+ if (SegName == "__TEXT" && SecName == "__eh_frame")
+ return true;
+
+ if (SegName == "__DATA" && SecName == "__nl_symbol_ptr")
+ return true;
+
+ return false;
+}
- CurSection = Section;
- CurSectionData = &getSectionData(*Section);
+void MCMachOStreamer::ChangeSection(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] &&
+ !Section->getBeginSymbol()) {
+ MCSymbol *Label = getContext().createLinkerPrivateTempSymbol();
+ Section->setBeginSymbol(Label);
+ HasSectionLabel[Section] = true;
+ }
+}
+
+void MCMachOStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
+ MCSymbol *EHSymbol) {
+ getAssembler().registerSymbol(*Symbol);
+ if (Symbol->isExternal())
+ EmitSymbolAttribute(EHSymbol, MCSA_Global);
+ if (cast<MCSymbolMachO>(Symbol)->isWeakDefinition())
+ EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
+ if (Symbol->isPrivateExtern())
+ EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
}
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- // FIXME: We should also use offsets into Fill fragments.
- MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
- if (!F)
- F = new MCDataFragment(CurSectionData);
+ // 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 = getSymbolData(*Symbol);
- assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
- SD.setFragment(F);
- SD.setOffset(F->getContents().size());
+ // 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.
+ cast<MCSymbolMachO>(Symbol)->clearReferenceType();
+}
+
+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);
+}
- // This causes the reference type and weak reference flags to be cleared.
- SD.setFlags(SD.getFlags() & ~(SF_WeakReference | SF_ReferenceTypeMask));
-
- Symbol->setSection(*CurSection);
+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);
}
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:
- Assembler.setSubsectionsViaSymbols(true);
+ getAssembler().setSubsectionsViaSymbols(true);
return;
}
+}
- assert(0 && "invalid assembler flag!");
+void MCMachOStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
+ getAssembler().getLinkerOptions().push_back(Options);
+}
+
+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;
+ }
}
-void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
- // Only absolute symbols can be redefined.
- assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
- "Cannot define a symbol twice!");
+void MCMachOStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
+ unsigned Minor, unsigned Update) {
+ getAssembler().setVersionMinInfo(Kind, Major, Minor, Update);
+}
- // FIXME: Lift context changes into super class.
- // FIXME: Set associated section.
- Symbol->setValue(Value);
+void MCMachOStreamer::EmitThumbFunc(MCSymbol *Symbol) {
+ // Remember that the function is a thumb function. Fixup and relocation
+ // values will need adjusted.
+ getAssembler().setIsThumbFunc(Symbol);
+ cast<MCSymbolMachO>(Symbol)->setThumbFunc();
}
-void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+bool MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Sym,
MCSymbolAttr Attribute) {
+ MCSymbolMachO *Symbol = cast<MCSymbolMachO>(Sym);
+
// Indirect symbols are handled differently, to match how 'as' handles
// them. This makes writing matching .o files easier.
if (Attribute == MCSA_IndirectSymbol) {
// important for matching the string table that 'as' generates.
IndirectSymbolData ISD;
ISD.Symbol = Symbol;
- ISD.SectionData = CurSectionData;
- Assembler.getIndirectSymbols().push_back(ISD);
- return;
+ ISD.Section = getCurrentSectionOnly();
+ getAssembler().getIndirectSymbols().push_back(ISD);
+ return true;
}
// Adding a symbol attribute always introduces the symbol, note that an
- // important side effect of calling getSymbolData here is to register the
- // symbol with the assembler.
- MCSymbolData &SD = getSymbolData(*Symbol);
+ // important side effect of calling registerSymbol here is to register
+ // the symbol with the assembler.
+ getAssembler().registerSymbol(*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
case MCSA_ELF_TypeTLS:
case MCSA_ELF_TypeCommon:
case MCSA_ELF_TypeNoType:
- case MCSA_IndirectSymbol:
+ case MCSA_ELF_TypeGnuUniqueObject:
case MCSA_Hidden:
+ case MCSA_IndirectSymbol:
case MCSA_Internal:
case MCSA_Protected:
case MCSA_Weak:
case MCSA_Local:
- assert(0 && "Invalid symbol attribute for Mach-O!");
- break;
+ return false;
case MCSA_Global:
- SD.setExternal(true);
+ Symbol->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.
+ Symbol->setReferenceTypeUndefinedLazy(false);
break;
case MCSA_LazyReference:
// FIXME: This requires -dynamic.
- SD.setFlags(SD.getFlags() | SF_NoDeadStrip);
+ Symbol->setNoDeadStrip();
if (Symbol->isUndefined())
- SD.setFlags(SD.getFlags() | SF_ReferenceTypeUndefinedLazy);
+ Symbol->setReferenceTypeUndefinedLazy(true);
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);
+ Symbol->setNoDeadStrip();
+ break;
+
+ case MCSA_SymbolResolver:
+ Symbol->setSymbolResolver();
break;
case MCSA_PrivateExtern:
- SD.setExternal(true);
- SD.setPrivateExtern(true);
+ Symbol->setExternal(true);
+ Symbol->setPrivateExtern(true);
break;
case MCSA_WeakReference:
// FIXME: This requires -dynamic.
if (Symbol->isUndefined())
- SD.setFlags(SD.getFlags() | SF_WeakReference);
+ Symbol->setWeakReference();
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);
+ Symbol->setWeakDefinition();
+ break;
+
+ case MCSA_WeakDefAutoPrivate:
+ Symbol->setWeakDefinition();
+ Symbol->setWeakReference();
break;
}
+
+ return true;
}
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
// Encode the 'desc' value into the lowest implementation defined bits.
- assert(DescValue == (DescValue & SF_DescFlagsMask) &&
- "Invalid .desc value!");
- getSymbolData(*Symbol).setFlags(DescValue & SF_DescFlagsMask);
+ getAssembler().registerSymbol(*Symbol);
+ cast<MCSymbolMachO>(Symbol)->setDesc(DescValue);
}
void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
// FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- MCSymbolData &SD = getSymbolData(*Symbol);
- SD.setExternal(true);
- SD.setCommon(Size, ByteAlignment);
+ getAssembler().registerSymbol(*Symbol);
+ Symbol->setExternal(true);
+ Symbol->setCommon(Size, ByteAlignment);
+}
+
+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::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
- unsigned Size, unsigned ByteAlignment) {
- MCSectionData &SectData = getSectionData(*Section);
+void MCMachOStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {
+ getAssembler().registerSection(*Section);
// The symbol may not be present, which only creates the section.
if (!Symbol)
return;
- // FIXME: Assert that this section has the zerofill type.
+ // On darwin all virtual sections have zerofill type.
+ assert(Section->isVirtualSection() && "Section does not have zerofill type!");
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- MCSymbolData &SD = getSymbolData(*Symbol);
+ getAssembler().registerSymbol(*Symbol);
- MCFragment *F = new MCZeroFillFragment(Size, ByteAlignment, &SectData);
- SD.setFragment(F);
+ // Emit an align fragment if necessary.
+ if (ByteAlignment != 1)
+ new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, Section);
- Symbol->setSection(*Section);
+ MCFragment *F = new MCFillFragment(0, 0, Size, Section);
+ Symbol->setFragment(F);
// Update the maximum alignment on the zero fill section if necessary.
- if (ByteAlignment > SectData.getAlignment())
- SectData.setAlignment(ByteAlignment);
-}
-
-void MCMachOStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
- MCDataFragment *DF = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
- if (!DF)
- DF = new MCDataFragment(CurSectionData);
- DF->getContents().append(Data.begin(), Data.end());
+ if (ByteAlignment > Section->getAlignment())
+ Section->setAlignment(ByteAlignment);
}
-void MCMachOStreamer::EmitValue(const MCExpr *Value, unsigned Size,
- unsigned AddrSpace) {
- new MCFillFragment(*AddValueSymbols(Value), Size, 1, 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(MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {
+ EmitZerofill(Section, Symbol, Size, ByteAlignment);
+ 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);
-
- // Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > CurSectionData->getAlignment())
- CurSectionData->setAlignment(ByteAlignment);
-}
-
-void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
- unsigned char Value) {
- new MCOrgFragment(*Offset, Value, CurSectionData);
-}
-
-void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
- // Scan for values.
- for (unsigned i = 0; i != Inst.getNumOperands(); ++i)
- if (Inst.getOperand(i).isExpr())
- AddValueSymbols(Inst.getOperand(i).getExpr());
-
- if (!Emitter)
- llvm_unreachable("no code emitter available!");
+void MCMachOStreamer::EmitInstToData(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ MCDataFragment *DF = getOrCreateDataFragment();
- CurSectionData->setHasInstructions(true);
-
- // FIXME: Relocations!
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
- Emitter->EncodeInstruction(Inst, VecOS, Fixups);
- EmitBytes(VecOS.str(), 0);
+ getAssembler().getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
+
+ // Add the fixups and data.
+ for (MCFixup &Fixup : Fixups) {
+ Fixup.setOffset(Fixup.getOffset() + DF->getContents().size());
+ DF->getFixups().push_back(Fixup);
+ }
+ 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 *, const MCSymbol *> DefiningSymbolMap;
+ for (const MCSymbol &Symbol : getAssembler().symbols()) {
+ if (getAssembler().isSymbolLinkerVisible(Symbol) && Symbol.isInSection() &&
+ !Symbol.isVariable()) {
+ // An atom defining symbol should never be internal to a fragment.
+ assert(Symbol.getOffset() == 0 &&
+ "Invalid offset in atom defining symbol!");
+ DefiningSymbolMap[Symbol.getFragment()] = &Symbol;
+ }
+ }
+
+ // Set the fragment atom associations by tracking the last seen atom defining
+ // symbol.
+ for (MCSection &Sec : getAssembler()) {
+ const MCSymbol *CurrentAtom = nullptr;
+ for (MCFragment &Frag : Sec) {
+ if (const MCSymbol *Symbol = DefiningSymbolMap.lookup(&Frag))
+ CurrentAtom = Symbol;
+ Frag.setAtom(CurrentAtom);
+ }
+ }
+
+ this->MCObjectStreamer::FinishImpl();
}
-MCStreamer *llvm::createMachOStreamer(MCContext &Context, raw_ostream &OS,
- MCCodeEmitter *CE) {
- return new MCMachOStreamer(Context, OS, CE);
+MCStreamer *llvm::createMachOStreamer(MCContext &Context, MCAsmBackend &MAB,
+ raw_pwrite_stream &OS, MCCodeEmitter *CE,
+ bool RelaxAll, bool DWARFMustBeAtTheEnd,
+ bool LabelSections) {
+ MCMachOStreamer *S = new MCMachOStreamer(Context, MAB, OS, CE,
+ DWARFMustBeAtTheEnd, LabelSections);
+ const Triple &TT = Context.getObjectFileInfo()->getTargetTriple();
+ if (TT.isOSDarwin()) {
+ unsigned Major, Minor, Update;
+ TT.getOSVersion(Major, Minor, Update);
+ // If there is a version specified, Major will be non-zero.
+ if (Major)
+ S->EmitVersionMin((TT.isMacOSX() ?
+ MCVM_OSXVersionMin : MCVM_IOSVersionMin),
+ Major, Minor, Update);
+ }
+ if (RelaxAll)
+ S->getAssembler().setRelaxAll(true);
+ return S;
}