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  1. //===-- llvm/MC/MCWasmObjectWriter.h - Wasm Object Writer -------*- 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_MCWASMOBJECTWRITER_H
  10. #define LLVM_MC_MCWASMOBJECTWRITER_H
  11.  
  12. #include "llvm/MC/MCObjectWriter.h"
  13. #include <memory>
  14.  
  15. namespace llvm {
  16.  
  17. class MCFixup;
  18. class MCSectionWasm;
  19. class MCValue;
  20. class raw_pwrite_stream;
  21.  
  22. class MCWasmObjectTargetWriter : public MCObjectTargetWriter {
  23.   const unsigned Is64Bit : 1;
  24.   const unsigned IsEmscripten : 1;
  25.  
  26. protected:
  27.   explicit MCWasmObjectTargetWriter(bool Is64Bit_, bool IsEmscripten);
  28.  
  29. public:
  30.   virtual ~MCWasmObjectTargetWriter();
  31.  
  32.   Triple::ObjectFormatType getFormat() const override { return Triple::Wasm; }
  33.   static bool classof(const MCObjectTargetWriter *W) {
  34.     return W->getFormat() == Triple::Wasm;
  35.   }
  36.  
  37.   virtual unsigned getRelocType(const MCValue &Target, const MCFixup &Fixup,
  38.                                 const MCSectionWasm &FixupSection,
  39.                                 bool IsLocRel) const = 0;
  40.  
  41.   /// \name Accessors
  42.   /// @{
  43.   bool is64Bit() const { return Is64Bit; }
  44.   bool isEmscripten() const { return IsEmscripten; }
  45.   /// @}
  46. };
  47.  
  48. /// Construct a new Wasm writer instance.
  49. ///
  50. /// \param MOTW - The target specific Wasm writer subclass.
  51. /// \param OS - The stream to write to.
  52. /// \returns The constructed object writer.
  53. std::unique_ptr<MCObjectWriter>
  54. createWasmObjectWriter(std::unique_ptr<MCWasmObjectTargetWriter> MOTW,
  55.                        raw_pwrite_stream &OS);
  56.  
  57. std::unique_ptr<MCObjectWriter>
  58. createWasmDwoObjectWriter(std::unique_ptr<MCWasmObjectTargetWriter> MOTW,
  59.                           raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS);
  60.  
  61. } // namespace llvm
  62.  
  63. #endif
  64.