//===----------------------------------------------------------------------===//
#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/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"
class MCMachOStreamer : public MCObjectStreamer {
private:
- virtual void EmitInstToData(const MCInst &Inst);
+ /// 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;
+
+ /// 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, MCAsmBackend &MAB, raw_ostream &OS,
- MCCodeEmitter *Emitter)
- : MCObjectStreamer(Context, 0, MAB, OS, Emitter) {}
+ MCCodeEmitter *Emitter, bool label)
+ : MCObjectStreamer(Context, MAB, OS, Emitter),
+ LabelSections(label) {}
/// @name MCStreamer Interface
/// @{
- virtual void InitSections();
- virtual void InitToTextSection();
- virtual void EmitLabel(MCSymbol *Symbol);
- virtual void EmitDebugLabel(MCSymbol *Symbol);
- virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
- MCSymbol *EHSymbol);
- virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
- virtual void EmitLinkerOptions(ArrayRef<std::string> Options);
- virtual void EmitDataRegion(MCDataRegionType Kind);
- virtual void EmitThumbFunc(MCSymbol *Func);
- virtual bool 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) {
+ void ChangeSection(const MCSection *Sect, const MCExpr *Subsect) override;
+ void EmitLabel(MCSymbol *Symbol) override;
+ void EmitDebugLabel(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) {
+ void EmitCOFFSymbolStorageClass(int StorageClass) override {
llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitCOFFSymbolType(int Type) {
+ void EmitCOFFSymbolType(int Type) override {
llvm_unreachable("macho doesn't support this directive");
}
- virtual void EndCOFFSymbolDef() {
+ void EndCOFFSymbolDef() override {
llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+ void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override {
llvm_unreachable("macho doesn't support this directive");
}
- virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment);
- virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
- uint64_t Size = 0, unsigned ByteAlignment = 0);
+ 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;
virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, unsigned ByteAlignment = 0);
+ uint64_t Size, unsigned ByteAlignment = 0) override;
- virtual void EmitFileDirective(StringRef Filename) {
+ 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 FinishImpl();
+ 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);
+ }
+
+ void FinishImpl() override;
};
} // end anonymous namespace.
-void MCMachOStreamer::InitSections() {
- InitToTextSection();
-}
-
-void MCMachOStreamer::InitToTextSection() {
- SwitchSection(getContext().getMachOSection(
- "__TEXT", "__text",
- MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 0,
- SectionKind::getText()));
+void MCMachOStreamer::ChangeSection(const MCSection *Section,
+ const MCExpr *Subsection) {
+ // Change the section normally.
+ MCObjectStreamer::ChangeSection(Section, Subsection);
+ // 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 *Start = getContext().CreateTempSymbol();
EmitLabel(Start);
// Record the region for the object writer to use.
- DataRegionData Data = { Kind, Start, NULL };
+ DataRegionData Data = { Kind, Start, nullptr };
std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
Regions.push_back(Data);
}
std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
assert(Regions.size() && "Mismatched .end_data_region!");
DataRegionData &Data = Regions.back();
- assert(Data.End == NULL && "Mismatched .end_data_region!");
+ 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::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
+ unsigned Minor, unsigned Update) {
+ getAssembler().setVersionMinInfo(Kind, Major, Minor, Update);
+}
+
void MCMachOStreamer::EmitThumbFunc(MCSymbol *Symbol) {
// Remember that the function is a thumb function. Fixup and relocation
// values will need adjusted.
// FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- AssignSection(Symbol, NULL);
+ AssignSection(Symbol, nullptr);
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
SD.setExternal(true);
void MCMachOStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {
// '.lcomm' is equivalent to '.zerofill'.
- return EmitZerofill(getContext().getMachOSection("__DATA", "__bss",
- MCSectionMachO::S_ZEROFILL,
- 0, SectionKind::getBSS()),
+ return EmitZerofill(getContext().getObjectFileInfo()->getDataBSSSection(),
Symbol, Size, ByteAlignment);
}
return;
}
-void MCMachOStreamer::EmitInstToData(const MCInst &Inst) {
+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);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
VecOS.flush();
// Add the fixups and data.
// 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))
MCStreamer *llvm::createMachOStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *CE,
- bool RelaxAll) {
- MCMachOStreamer *S = new MCMachOStreamer(Context, MAB, OS, CE);
+ bool RelaxAll,
+ bool LabelSections) {
+ MCMachOStreamer *S = new MCMachOStreamer(Context, MAB, OS, CE, LabelSections);
if (RelaxAll)
S->getAssembler().setRelaxAll(true);
return S;
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