1 //===- MCELFStreamer.h - MCStreamer ELF Object File Interface ---*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef LLVM_MC_MCELFSTREAMER_H 11 #define LLVM_MC_MCELFSTREAMER_H 12 13 #include "llvm/ADT/SmallPtrSet.h" 14 #include "llvm/MC/MCDirectives.h" 15 #include "llvm/MC/MCObjectStreamer.h" 16 #include "llvm/MC/SectionKind.h" 17 #include "llvm/Support/DataTypes.h" 18 19 namespace llvm { 20 class MCAsmBackend; 21 class MCAssembler; 22 class MCCodeEmitter; 23 class MCExpr; 24 class MCInst; 25 class raw_ostream; 26 27 class MCELFStreamer : public MCObjectStreamer { 28 public: MCELFStreamer(MCContext & Context,MCAsmBackend & TAB,raw_pwrite_stream & OS,MCCodeEmitter * Emitter)29 MCELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_pwrite_stream &OS, 30 MCCodeEmitter *Emitter) 31 : MCObjectStreamer(Context, TAB, OS, Emitter), SeenIdent(false) {} 32 33 ~MCELFStreamer() override; 34 35 /// state management reset()36 void reset() override { 37 SeenIdent = false; 38 BundleGroups.clear(); 39 MCObjectStreamer::reset(); 40 } 41 42 /// \name MCStreamer Interface 43 /// @{ 44 45 void InitSections(bool NoExecStack) override; 46 void ChangeSection(MCSection *Section, const MCExpr *Subsection) override; 47 void EmitLabel(MCSymbol *Symbol) override; 48 void EmitAssemblerFlag(MCAssemblerFlag Flag) override; 49 void EmitThumbFunc(MCSymbol *Func) override; 50 void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override; 51 bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override; 52 void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override; 53 void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 54 unsigned ByteAlignment) override; 55 void BeginCOFFSymbolDef(const MCSymbol *Symbol) override; 56 void EmitCOFFSymbolStorageClass(int StorageClass) override; 57 void EmitCOFFSymbolType(int Type) override; 58 void EndCOFFSymbolDef() override; 59 60 void emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) override; 61 62 void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, 63 unsigned ByteAlignment) override; 64 65 void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr, 66 uint64_t Size = 0, unsigned ByteAlignment = 0) override; 67 void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size, 68 unsigned ByteAlignment = 0) override; 69 void EmitValueImpl(const MCExpr *Value, unsigned Size, 70 SMLoc Loc = SMLoc()) override; 71 72 void EmitFileDirective(StringRef Filename) override; 73 74 void EmitIdent(StringRef IdentString) override; 75 76 void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned) override; 77 78 void FinishImpl() override; 79 80 void EmitBundleAlignMode(unsigned AlignPow2) override; 81 void EmitBundleLock(bool AlignToEnd) override; 82 void EmitBundleUnlock() override; 83 84 private: 85 bool isBundleLocked() const; 86 void EmitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override; 87 void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override; 88 89 void fixSymbolsInTLSFixups(const MCExpr *expr); 90 91 /// \brief Merge the content of the fragment \p EF into the fragment \p DF. 92 void mergeFragment(MCDataFragment *, MCDataFragment *); 93 94 bool SeenIdent; 95 96 /// BundleGroups - The stack of fragments holding the bundle-locked 97 /// instructions. 98 llvm::SmallVector<MCDataFragment *, 4> BundleGroups; 99 }; 100 101 MCELFStreamer *createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB, 102 raw_pwrite_stream &OS, 103 MCCodeEmitter *Emitter, bool RelaxAll, 104 bool IsThumb); 105 106 } // end namespace llvm 107 108 #endif 109