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 MCValue;
19 class raw_pwrite_stream;
20 
21 class MCWasmObjectTargetWriter : public MCObjectTargetWriter {
22   const unsigned Is64Bit : 1;
23   const unsigned IsEmscripten : 1;
24 
25 protected:
26   explicit MCWasmObjectTargetWriter(bool Is64Bit_, bool IsEmscripten);
27 
28 public:
29   virtual ~MCWasmObjectTargetWriter();
30 
getFormat()31   virtual Triple::ObjectFormatType getFormat() const { return Triple::Wasm; }
classof(const MCObjectTargetWriter * W)32   static bool classof(const MCObjectTargetWriter *W) {
33     return W->getFormat() == Triple::Wasm;
34   }
35 
36   virtual unsigned getRelocType(const MCValue &Target,
37                                 const MCFixup &Fixup) const = 0;
38 
39   /// \name Accessors
40   /// @{
is64Bit()41   bool is64Bit() const { return Is64Bit; }
isEmscripten()42   bool isEmscripten() const { return IsEmscripten; }
43   /// @}
44 };
45 
46 /// Construct a new Wasm writer instance.
47 ///
48 /// \param MOTW - The target specific Wasm writer subclass.
49 /// \param OS - The stream to write to.
50 /// \returns The constructed object writer.
51 std::unique_ptr<MCObjectWriter>
52 createWasmObjectWriter(std::unique_ptr<MCWasmObjectTargetWriter> MOTW,
53                        raw_pwrite_stream &OS);
54 
55 } // namespace llvm
56 
57 #endif
58