include/llvm/MC/MCELFStreamer.h

   1 //===- MCELFStreamer.h - MCStreamer ELF Object File Interface ---*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_MC_MCELFSTREAMER_H
  10 #define LLVM_MC_MCELFSTREAMER_H
  11
  12 #include "llvm/ADT/SmallVector.h"
  13 #include "llvm/MC/MCDirectives.h"
  14 #include "llvm/MC/MCObjectStreamer.h"
  15
  16 namespace llvm {
  17
  18 class MCAsmBackend;
  19 class MCCodeEmitter;
  20 class MCExpr;
  21 class MCInst;
  22
  23 class MCELFStreamer : public MCObjectStreamer {
  24 public:
  25   MCELFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
  26                 std::unique_ptr<MCObjectWriter> OW,
  27                 std::unique_ptr<MCCodeEmitter> Emitter);
  28
  29   ~MCELFStreamer() override = default;
  30
  31   /// state management
  32   void reset() override {
  33     SeenIdent = false;
  34     BundleGroups.clear();
  35     MCObjectStreamer::reset();
  36   }
  37
  38   /// \name MCStreamer Interface
  39   /// @{
  40
  41   void InitSections(bool NoExecStack) override;
  42   void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
  43   void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
  44   void EmitLabel(MCSymbol *Symbol, SMLoc Loc, MCFragment *F) override;
  45   void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
  46   void EmitThumbFunc(MCSymbol *Func) override;
  47   void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
  48   bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
  49   void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
  50   void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
  51                         unsigned ByteAlignment) override;
  52
  53   void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
  54   void emitELFSymverDirective(StringRef AliasName,
  55                               const MCSymbol *Aliasee) override;
  56
  57   void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
  58                              unsigned ByteAlignment) override;
  59
  60   void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
  61                     uint64_t Size = 0, unsigned ByteAlignment = 0,
  62                     SMLoc L = SMLoc()) override;
  63   void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
  64                       unsigned ByteAlignment = 0) override;
  65   void EmitValueImpl(const MCExpr *Value, unsigned Size,
  66                      SMLoc Loc = SMLoc()) override;
  67
  68   void EmitIdent(StringRef IdentString) override;
  69
  70   void EmitValueToAlignment(unsigned, int64_t, unsigned, unsigned) override;
  71
  72   void emitCGProfileEntry(const MCSymbolRefExpr *From,
  73                           const MCSymbolRefExpr *To, uint64_t Count) override;
  74
  75   void FinishImpl() override;
  76
  77   void EmitBundleAlignMode(unsigned AlignPow2) override;
  78   void EmitBundleLock(bool AlignToEnd) override;
  79   void EmitBundleUnlock() override;
  80
  81 private:
  82   bool isBundleLocked() const;
  83   void EmitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override;
  84   void EmitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override;
  85
  86   void fixSymbolsInTLSFixups(const MCExpr *expr);
  87   void finalizeCGProfileEntry(const MCSymbolRefExpr *&S);
  88   void finalizeCGProfile();
  89
  90   /// Merge the content of the fragment \p EF into the fragment \p DF.
  91   void mergeFragment(MCDataFragment *, MCDataFragment *);
  92
  93   bool SeenIdent = false;
  94
  95   /// BundleGroups - The stack of fragments holding the bundle-locked
  96   /// instructions.
  97   SmallVector<MCDataFragment *, 4> BundleGroups;
  98 };
  99
 100 MCELFStreamer *createARMELFStreamer(MCContext &Context,
 101                                     std::unique_ptr<MCAsmBackend> TAB,
 102                                     std::unique_ptr<MCObjectWriter> OW,
 103                                     std::unique_ptr<MCCodeEmitter> Emitter,
 104                                     bool RelaxAll, bool IsThumb);
 105
 106 } // end namespace llvm
 107
 108 #endif // LLVM_MC_MCELFSTREAMER_H