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  1. //===- MCWasmStreamer.h - MCStreamer Wasm 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_MCWASMSTREAMER_H
  10. #define LLVM_MC_MCWASMSTREAMER_H
  11.  
  12. #include "MCAsmBackend.h"
  13. #include "MCCodeEmitter.h"
  14. #include "llvm/MC/MCDirectives.h"
  15. #include "llvm/MC/MCObjectStreamer.h"
  16. #include "llvm/MC/MCObjectWriter.h"
  17. #include "llvm/Support/DataTypes.h"
  18.  
  19. namespace llvm {
  20. class MCExpr;
  21. class MCInst;
  22.  
  23. class MCWasmStreamer : public MCObjectStreamer {
  24. public:
  25.   MCWasmStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
  26.                  std::unique_ptr<MCObjectWriter> OW,
  27.                  std::unique_ptr<MCCodeEmitter> Emitter)
  28.       : MCObjectStreamer(Context, std::move(TAB), std::move(OW),
  29.                          std::move(Emitter)),
  30.         SeenIdent(false) {}
  31.  
  32.   ~MCWasmStreamer() override;
  33.  
  34.   /// state management
  35.   void reset() override {
  36.     SeenIdent = false;
  37.     MCObjectStreamer::reset();
  38.   }
  39.  
  40.   /// \name MCStreamer Interface
  41.   /// @{
  42.  
  43.   void changeSection(MCSection *Section, const MCExpr *Subsection) override;
  44.   void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
  45.   void emitLabelAtPos(MCSymbol *Symbol, SMLoc Loc, MCFragment *F,
  46.                       uint64_t Offset) override;
  47.   void emitAssemblerFlag(MCAssemblerFlag Flag) override;
  48.   void emitThumbFunc(MCSymbol *Func) override;
  49.   void emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
  50.   bool emitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
  51.   void emitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
  52.   void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
  53.                         Align ByteAlignment) override;
  54.  
  55.   void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
  56.  
  57.   void emitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
  58.                              Align ByteAlignment) override;
  59.  
  60.   void emitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
  61.                     uint64_t Size = 0, Align ByteAlignment = Align(1),
  62.                     SMLoc Loc = SMLoc()) override;
  63.   void emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
  64.                       Align ByteAlignment = Align(1)) override;
  65.  
  66.   void emitIdent(StringRef IdentString) override;
  67.  
  68.   void finishImpl() override;
  69.  
  70. private:
  71.   void emitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override;
  72.   void emitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override;
  73.  
  74.   void fixSymbolsInTLSFixups(const MCExpr *expr);
  75.  
  76.   /// Merge the content of the fragment \p EF into the fragment \p DF.
  77.   void mergeFragment(MCDataFragment *, MCDataFragment *);
  78.  
  79.   bool SeenIdent;
  80. };
  81.  
  82. } // end namespace llvm
  83.  
  84. #endif
  85.