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 #include <vector> 19 20 namespace llvm { 21 class MCAsmBackend; 22 class MCAssembler; 23 class MCCodeEmitter; 24 class MCExpr; 25 class MCInst; 26 class MCSymbol; 27 class MCSymbolData; 28 class raw_ostream; 29 30 class MCELFStreamer : public MCObjectStreamer { 31 public: MCELFStreamer(MCContext & Context,MCAsmBackend & TAB,raw_ostream & OS,MCCodeEmitter * Emitter)32 MCELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &OS, 33 MCCodeEmitter *Emitter) 34 : MCObjectStreamer(Context, TAB, OS, Emitter), 35 SeenIdent(false) {} 36 MCELFStreamer(MCContext & Context,MCAsmBackend & TAB,raw_ostream & OS,MCCodeEmitter * Emitter,MCAssembler * Assembler)37 MCELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &OS, 38 MCCodeEmitter *Emitter, MCAssembler *Assembler) 39 : MCObjectStreamer(Context, TAB, OS, Emitter, Assembler), 40 SeenIdent(false) {} 41 42 virtual ~MCELFStreamer(); 43 44 /// state management reset()45 void reset() override { 46 LocalCommons.clear(); 47 BindingExplicitlySet.clear(); 48 SeenIdent = false; 49 MCObjectStreamer::reset(); 50 } 51 52 /// @name MCStreamer Interface 53 /// @{ 54 55 void InitSections(bool NoExecStack) override; 56 void ChangeSection(const MCSection *Section, 57 const MCExpr *Subsection) override; 58 void EmitLabel(MCSymbol *Symbol) override; 59 void EmitAssemblerFlag(MCAssemblerFlag Flag) override; 60 void EmitThumbFunc(MCSymbol *Func) override; 61 void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override; 62 bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override; 63 void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override; 64 void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, 65 unsigned ByteAlignment) override; 66 void BeginCOFFSymbolDef(const MCSymbol *Symbol) override; 67 void EmitCOFFSymbolStorageClass(int StorageClass) override; 68 void EmitCOFFSymbolType(int Type) override; 69 void EndCOFFSymbolDef() override; 70 71 void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override; 72 73 void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, 74 unsigned ByteAlignment) override; 75 76 void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = nullptr, 77 uint64_t Size = 0, unsigned ByteAlignment = 0) override; 78 void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, 79 uint64_t Size, unsigned ByteAlignment = 0) override; 80 void EmitValueImpl(const MCExpr *Value, unsigned Size, 81 const SMLoc &Loc = SMLoc()) override; 82 83 void EmitFileDirective(StringRef Filename) override; 84 85 void EmitIdent(StringRef IdentString) override; 86 87 void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned) override; 88 89 void Flush() override; 90 91 void FinishImpl() override; 92 93 void EmitBundleAlignMode(unsigned AlignPow2) override; 94 void EmitBundleLock(bool AlignToEnd) override; 95 void EmitBundleUnlock() override; 96 97 private: 98 void EmitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override; 99 void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override; 100 101 void fixSymbolsInTLSFixups(const MCExpr *expr); 102 103 bool SeenIdent; 104 105 struct LocalCommon { 106 MCSymbolData *SD; 107 uint64_t Size; 108 unsigned ByteAlignment; 109 }; 110 111 std::vector<LocalCommon> LocalCommons; 112 113 SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet; 114 }; 115 116 MCELFStreamer *createARMELFStreamer(MCContext &Context, MCAsmBackend &TAB, 117 raw_ostream &OS, MCCodeEmitter *Emitter, 118 bool RelaxAll, bool IsThumb); 119 120 } // end namespace llvm 121 122 #endif 123