-//===- 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/MCMachOSymbolFlags.h"
+#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCMachOSymbolFlags.h"
#include "llvm/MC/MCSectionMachO.h"
-#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetAsmBackend.h"
using namespace llvm;
class MCMachOStreamer : public MCObjectStreamer {
private:
- void EmitInstToFragment(const MCInst &Inst);
- void EmitInstToData(const MCInst &Inst);
- // FIXME: These will likely moved to a better place.
- const MCExpr * MakeStartMinusEndExpr(MCSymbol *Start, MCSymbol *End,
- int IntVal);
- void EmitDwarfFileTable(void);
+ /// 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;
+
+ void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &STI) override;
+
+ void EmitDataRegion(DataRegionData::KindTy Kind);
+ void EmitDataRegionEnd();
public:
- MCMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
- raw_ostream &OS, MCCodeEmitter *Emitter)
- : MCObjectStreamer(Context, TAB, OS, Emitter) {}
+ 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 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 BeginCOFFSymbolDef(const MCSymbol *Symbol) {
- assert(0 && "macho doesn't support this directive");
+ 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");
}
- virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
- assert(0 && "macho doesn't support this directive");
+ void EmitCOFFSymbolStorageClass(int StorageClass) override {
+ llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitCOFFSymbolType(int Type) {
- assert(0 && "macho doesn't support this directive");
+ void EmitCOFFSymbolType(int Type) override {
+ llvm_unreachable("macho doesn't support this directive");
}
- virtual void EndCOFFSymbolDef() {
- assert(0 && "macho doesn't support this directive");
+ void EndCOFFSymbolDef() override {
+ llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
- assert(0 && "macho doesn't support this directive");
+ void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) 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");
- }
- virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
- unsigned Size = 0, unsigned ByteAlignment = 0);
- virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, 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");
- }
- virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
- unsigned ValueSize = 1,
- unsigned MaxBytesToEmit = 0);
- virtual void EmitCodeAlignment(unsigned ByteAlignment,
- unsigned MaxBytesToEmit = 0);
- virtual void EmitValueToOffset(const MCExpr *Offset,
- unsigned char Value = 0);
-
- virtual void EmitFileDirective(StringRef Filename) {
+ 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'");
+ // report_fatal_error("unsupported directive: '.file'");
}
- virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
- // FIXME: Just ignore the .file; it isn't important enough to fail the
- // entire assembly.
- //report_fatal_error("unsupported directive: '.file'");
+ void EmitIdent(StringRef IdentString) override {
+ llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitInstruction(const MCInst &Inst);
-
- virtual void Finish();
+ void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override {
+ getAssembler().getLOHContainer().addDirective(Kind, Args);
+ }
- /// @}
+ void FinishImpl() override;
};
} // end anonymous namespace.
-void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
- // TODO: This is almost exactly the same as WinCOFFStreamer. Consider merging
- // into MCObjectStreamer.
- assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
- assert(CurSection && "Cannot emit before setting section!");
+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();
- Symbol->setSection(*CurSection);
+ if (SegName == "__LD" && SecName == "__compact_unwind")
+ return true;
- MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ 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;
+}
+
+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);
+}
+
+void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+
+ // 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(SD.getSymbol()))
- new MCDataFragment(getCurrentSectionData());
-
- // FIXME: This is wasteful, we don't necessarily need to create a data
- // fragment. Instead, we should mark the symbol as pointing into the data
- // fragment if it exists, otherwise we should just queue the label and set its
- // fragment pointer when we emit the next fragment.
- MCDataFragment *F = getOrCreateDataFragment();
- assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
- SD.setFragment(F);
- SD.setOffset(F->getContents().size());
+ 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
SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeMask);
}
+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);
+}
+
+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:
getAssembler().setSubsectionsViaSymbols(true);
return;
}
+}
+
+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;
+ }
+}
- assert(0 && "invalid assembler flag!");
+void MCMachOStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
+ unsigned Minor, unsigned Update) {
+ getAssembler().setVersionMinInfo(Kind, Major, Minor, Update);
}
-void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- // FIXME: Lift context changes into super class.
- getAssembler().getOrCreateSymbolData(*Symbol);
- Symbol->setVariableValue(AddValueSymbols(Value));
+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::EmitSymbolAttribute(MCSymbol *Symbol,
+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.
ISD.Symbol = Symbol;
ISD.SectionData = getCurrentSectionData();
getAssembler().getIndirectSymbols().push_back(ISD);
- return;
+ return true;
}
// Adding a symbol attribute always introduces the symbol, note that an
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);
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);
SD.setFlags(SD.getFlags() | SF_WeakDefinition | SF_WeakReference);
break;
}
+
+ return true;
}
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
// FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+ AssignSection(Symbol, nullptr);
+
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
SD.setExternal(true);
SD.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) {
+ uint64_t Size, unsigned ByteAlignment) {
MCSectionData &SectData = getAssembler().getOrCreateSectionData(*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!");
MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
SD.setFragment(F);
- Symbol->setSection(*Section);
+ AssignSection(Symbol, Section);
// Update the maximum alignment on the zero fill section if necessary.
if (ByteAlignment > SectData.getAlignment())
return;
}
-void MCMachOStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
-}
-
-void MCMachOStreamer::EmitValue(const MCExpr *Value, unsigned Size,
- unsigned AddrSpace) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
+void MCMachOStreamer::EmitInstToData(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
MCDataFragment *DF = getOrCreateDataFragment();
- // Avoid fixups when possible.
- int64_t AbsValue;
- if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue)) {
- // FIXME: Endianness assumption.
- for (unsigned i = 0; i != Size; ++i)
- DF->getContents().push_back(uint8_t(AbsValue >> (i * 8)));
- } else {
- DF->addFixup(MCFixup::Create(DF->getContents().size(),
- AddValueSymbols(Value),
- MCFixup::getKindForSize(Size)));
- DF->getContents().resize(DF->getContents().size() + Size, 0);
- }
-}
-
-void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
- int64_t Value, unsigned ValueSize,
- unsigned MaxBytesToEmit) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- if (MaxBytesToEmit == 0)
- MaxBytesToEmit = ByteAlignment;
- new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
- getCurrentSectionData());
-
- // Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > getCurrentSectionData()->getAlignment())
- getCurrentSectionData()->setAlignment(ByteAlignment);
-}
-
-void MCMachOStreamer::EmitCodeAlignment(unsigned ByteAlignment,
- unsigned MaxBytesToEmit) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- if (MaxBytesToEmit == 0)
- MaxBytesToEmit = ByteAlignment;
- MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
- getCurrentSectionData());
- F->setEmitNops(true);
-
- // Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > getCurrentSectionData()->getAlignment())
- getCurrentSectionData()->setAlignment(ByteAlignment);
-}
-
-void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
- unsigned char Value) {
- new MCOrgFragment(*Offset, Value, getCurrentSectionData());
-}
-
-void MCMachOStreamer::EmitInstToFragment(const MCInst &Inst) {
- MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
-
- // Add the fixups and data.
- //
- // FIXME: Revisit this design decision when relaxation is done, we may be
- // able to get away with not storing any extra data in the MCInst.
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
- getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
- VecOS.flush();
-
- IF->getCode() = Code;
- IF->getFixups() = Fixups;
-}
-
-void MCMachOStreamer::EmitInstToData(const MCInst &Inst) {
- MCDataFragment *DF = getOrCreateDataFragment();
-
- SmallVector<MCFixup, 4> Fixups;
- SmallString<256> Code;
- raw_svector_ostream VecOS(Code);
- getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ 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->addFixup(Fixups[i]);
+ DF->getFixups().push_back(Fixups[i]);
}
DF->getContents().append(Code.begin(), Code.end());
}
-void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
- // Scan for values.
- for (unsigned i = Inst.getNumOperands(); i--; )
- if (Inst.getOperand(i).isExpr())
- AddValueSymbols(Inst.getOperand(i).getExpr());
-
- getCurrentSectionData()->setHasInstructions(true);
-
- // If this instruction doesn't need relaxation, just emit it as data.
- if (!getAssembler().getBackend().MayNeedRelaxation(Inst)) {
- EmitInstToData(Inst);
- return;
- }
-
- // Otherwise, if we are relaxing everything, relax the instruction as much as
- // possible and emit it as data.
- if (getAssembler().getRelaxAll()) {
- MCInst Relaxed;
- getAssembler().getBackend().RelaxInstruction(Inst, Relaxed);
- while (getAssembler().getBackend().MayNeedRelaxation(Relaxed))
- getAssembler().getBackend().RelaxInstruction(Relaxed, Relaxed);
- EmitInstToData(Relaxed);
- return;
- }
-
- // Otherwise emit to a separate fragment.
- EmitInstToFragment(Inst);
-}
-
-//
-// This helper routine returns an expression of End - Start + IntVal for use
-// by EmitDwarfFileTable() below.
-//
-const MCExpr * MCMachOStreamer::MakeStartMinusEndExpr(MCSymbol *Start,
- MCSymbol *End,
- int IntVal) {
- MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
- const MCExpr *Res =
- MCSymbolRefExpr::Create(End, Variant, getContext());
- const MCExpr *RHS =
- MCSymbolRefExpr::Create(Start, Variant, getContext());
- const MCExpr *Res1 =
- MCBinaryExpr::Create(MCBinaryExpr::Sub, Res, RHS,getContext());
- const MCExpr *Res2 =
- MCConstantExpr::Create(IntVal, getContext());
- const MCExpr *Res3 =
- MCBinaryExpr::Create(MCBinaryExpr::Sub, Res1, Res2, getContext());
- return Res3;
-}
-
-//
-// This emits the Dwarf file (and eventually the line) table.
-//
-void MCMachOStreamer::EmitDwarfFileTable(void) {
- // For now make sure we don't put out the Dwarf file table if no .file
- // directives were seen.
- const std::vector<MCDwarfFile *> &MCDwarfFiles =
- getContext().getMCDwarfFiles();
- if (MCDwarfFiles.size() == 0)
- return;
-
- // This is the Mach-O section, for ELF it is the .debug_line section.
- SwitchSection(getContext().getMachOSection("__DWARF", "__debug_line",
- MCSectionMachO::S_ATTR_DEBUG,
- 0, SectionKind::getDataRelLocal()));
-
- // Create a symbol at the beginning of this section.
- MCSymbol *LineStartSym = getContext().CreateTempSymbol();
- // Set the value of the symbol, as we are at the start of the section.
- EmitLabel(LineStartSym);
-
- // Create a symbol for the end of the section (to be set when we get there).
- MCSymbol *LineEndSym = getContext().CreateTempSymbol();
-
- // The first 4 bytes is the total length of the information for this
- // compilation unit (not including these 4 bytes for the length).
- EmitValue(MakeStartMinusEndExpr(LineStartSym, LineEndSym, 4), 4, 0);
-
- // Next 2 bytes is the Version, which is Dwarf 2.
- EmitIntValue(2, 2);
-
- // Create a symbol for the end of the prologue (to be set when we get there).
- MCSymbol *ProEndSym = getContext().CreateTempSymbol(); // Lprologue_end
-
- // Length of the prologue, is the next 4 bytes. Which is the start of the
- // section to the end of the prologue. Not including the 4 bytes for the
- // total length, the 2 bytes for the version, and these 4 bytes for the
- // length of the prologue.
- EmitValue(MakeStartMinusEndExpr(LineStartSym, ProEndSym, (4 + 2 + 4)), 4, 0);
-
- // Parameters of the state machine, are next.
- // Define the architecture-dependent minimum instruction length (in
- // bytes). This value should be rather too small than too big. */
- // DWARF2_LINE_MIN_INSN_LENGTH
- EmitIntValue(1, 1);
- // Flag that indicates the initial value of the is_stmt_start flag.
- // DWARF2_LINE_DEFAULT_IS_STMT
- EmitIntValue(1, 1);
- // Minimum line offset in a special line info. opcode. This value
- // was chosen to give a reasonable range of values. */
- // DWARF2_LINE_BASE
- EmitIntValue(-5, 1);
- // Range of line offsets in a special line info. opcode.
- // DWARF2_LINE_RANGE
- EmitIntValue(14, 1);
- // First special line opcode - leave room for the standard opcodes.
- // DWARF2_LINE_OPCODE_BASE
- EmitIntValue(13, 1);
-
- // Standard opcode lengths
- EmitIntValue(0, 1); // length of DW_LNS_copy
- EmitIntValue(1, 1); // length of DW_LNS_advance_pc
- EmitIntValue(1, 1); // length of DW_LNS_advance_line
- EmitIntValue(1, 1); // length of DW_LNS_set_file
- EmitIntValue(1, 1); // length of DW_LNS_set_column
- EmitIntValue(0, 1); // length of DW_LNS_negate_stmt
- EmitIntValue(0, 1); // length of DW_LNS_set_basic_block
- EmitIntValue(0, 1); // length of DW_LNS_const_add_pc
- EmitIntValue(1, 1); // length of DW_LNS_fixed_advance_pc
- EmitIntValue(0, 1); // length of DW_LNS_set_prologue_end
- EmitIntValue(0, 1); // length of DW_LNS_set_epilogue_begin
- EmitIntValue(1, 1); // DW_LNS_set_isa
-
- // Put out the directory and file tables.
-
- // First the directory table.
- const std::vector<StringRef> &MCDwarfDirs =
- getContext().getMCDwarfDirs();
- for (unsigned i = 0; i < MCDwarfDirs.size(); i++) {
- EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName
- EmitBytes(StringRef("\0", 1), 0); // the null termination of the string
- }
- EmitIntValue(0, 1); // Terminate the directory list
-
- // Second the file table.
- for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
- EmitBytes(MCDwarfFiles[i]->getName(), 0); // FileName
- EmitBytes(StringRef("\0", 1), 0); // the null termination of the string
- // FIXME the Directory number should be a .uleb128 not a .byte
- EmitIntValue(MCDwarfFiles[i]->getDirIndex(), 1);
- EmitIntValue(0, 1); // last modification timestamp (always 0)
- EmitIntValue(0, 1); // filesize (always 0)
- }
- EmitIntValue(0, 1); // Terminate the file list
-
- // This is the end of the prologue, so set the value of the symbol at the
- // end of the prologue (that was used in a previous expression).
- EmitLabel(ProEndSym);
-
- // TODO: This is the point where the line tables would be emitted.
-
- // If there are no line tables emited then we emit:
- // The following DW_LNE_set_address sequence to set the address to zero
- // TODO test for 32-bit or 64-bit output
- // This is the sequence for 32-bit code
- EmitIntValue(0, 1);
- EmitIntValue(5, 1);
- EmitIntValue(2, 1);
- EmitIntValue(0, 1);
- EmitIntValue(0, 1);
- EmitIntValue(0, 1);
- EmitIntValue(0, 1);
-
- // Lastly emit the DW_LNE_end_sequence which consists of 3 bytes '00 01 01'
- // (00 is the code for extended opcodes, followed by a ULEB128 length of the
- // extended opcode (01), and the DW_LNE_end_sequence (01).
- EmitIntValue(0, 1); // DW_LNS_extended_op
- EmitIntValue(1, 1); // ULEB128 length of the extended opcode
- EmitIntValue(1, 1); // DW_LNE_end_sequence
-
- // This is the end of the section, so set the value of the symbol at the end
- // of this section (that was used in a previous expression).
- EmitLabel(LineEndSym);
-}
-
-void MCMachOStreamer::Finish() {
- // Dump out the dwarf file and directory tables (soon to include line table)
- EmitDwarfFileTable();
+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 (MCAssembler::symbol_iterator it = getAssembler().symbol_begin(),
- ie = getAssembler().symbol_end(); it != ie; ++it) {
- if (getAssembler().isSymbolLinkerVisible(it->getSymbol()) &&
- it->getFragment()) {
+ for (MCSymbolData &SD : getAssembler().symbols()) {
+ if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()) &&
+ SD.getFragment()) {
// An atom defining symbol should never be internal to a fragment.
- assert(it->getOffset() == 0 && "Invalid offset in atom defining symbol!");
- DefiningSymbolMap[it->getFragment()] = it;
+ assert(SD.getOffset() == 0 && "Invalid offset in atom defining symbol!");
+ DefiningSymbolMap[SD.getFragment()] = &SD;
}
}
// symbol.
for (MCAssembler::iterator it = getAssembler().begin(),
ie = getAssembler().end(); it != ie; ++it) {
- MCSymbolData *CurrentAtom = 0;
+ MCSymbolData *CurrentAtom = nullptr;
for (MCSectionData::iterator it2 = it->begin(),
ie2 = it->end(); it2 != ie2; ++it2) {
if (MCSymbolData *SD = DefiningSymbolMap.lookup(it2))
}
}
- this->MCObjectStreamer::Finish();
+ this->MCObjectStreamer::FinishImpl();
}
-MCStreamer *llvm::createMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
+MCStreamer *llvm::createMachOStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *CE,
- bool RelaxAll) {
- MCMachOStreamer *S = new MCMachOStreamer(Context, TAB, OS, 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