1//=- WebAssemblyMCCodeEmitter.cpp - Convert WebAssembly code to machine code -//
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/// \file
11/// \brief This file implements the WebAssemblyMCCodeEmitter class.
12///
13//===----------------------------------------------------------------------===//
14
15#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
16#include "llvm/ADT/Statistic.h"
17#include "llvm/MC/MCCodeEmitter.h"
18#include "llvm/MC/MCFixup.h"
19#include "llvm/MC/MCInst.h"
20#include "llvm/MC/MCInstrInfo.h"
21#include "llvm/MC/MCRegisterInfo.h"
22#include "llvm/MC/MCSubtargetInfo.h"
23#include "llvm/MC/MCSymbol.h"
24#include "llvm/Support/raw_ostream.h"
25using namespace llvm;
26
27#define DEBUG_TYPE "mccodeemitter"
28
29namespace {
30class WebAssemblyMCCodeEmitter final : public MCCodeEmitter {
31  const MCRegisterInfo &MRI;
32
33public:
34  WebAssemblyMCCodeEmitter(const MCInstrInfo &, const MCRegisterInfo &mri,
35                           MCContext &)
36      : MRI(mri) {}
37
38  ~WebAssemblyMCCodeEmitter() override {}
39
40  /// TableGen'erated function for getting the binary encoding for an
41  /// instruction.
42  uint64_t getBinaryCodeForInstr(const MCInst &MI,
43                                 SmallVectorImpl<MCFixup> &Fixups,
44                                 const MCSubtargetInfo &STI) const;
45
46  /// Return binary encoding of operand. If the machine operand requires
47  /// relocation, record the relocation and return zero.
48  unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
49                             SmallVectorImpl<MCFixup> &Fixups,
50                             const MCSubtargetInfo &STI) const;
51
52  uint64_t getMemoryOpValue(const MCInst &MI, unsigned Op,
53                            SmallVectorImpl<MCFixup> &Fixups,
54                            const MCSubtargetInfo &STI) const;
55
56  void encodeInstruction(const MCInst &MI, raw_ostream &OS,
57                         SmallVectorImpl<MCFixup> &Fixups,
58                         const MCSubtargetInfo &STI) const override;
59};
60} // end anonymous namespace
61
62MCCodeEmitter *llvm::createWebAssemblyMCCodeEmitter(const MCInstrInfo &MCII,
63                                                    const MCRegisterInfo &MRI,
64                                                    MCContext &Ctx) {
65  return new WebAssemblyMCCodeEmitter(MCII, MRI, Ctx);
66}
67
68unsigned WebAssemblyMCCodeEmitter::getMachineOpValue(
69    const MCInst &MI, const MCOperand &MO, SmallVectorImpl<MCFixup> &Fixups,
70    const MCSubtargetInfo &STI) const {
71  if (MO.isReg())
72    return MRI.getEncodingValue(MO.getReg());
73  if (MO.isImm())
74    return static_cast<unsigned>(MO.getImm());
75
76  assert(MO.isExpr());
77
78  assert(MO.getExpr()->getKind() == MCExpr::SymbolRef);
79
80  assert(false && "FIXME: not implemented yet");
81
82  return 0;
83}
84
85void WebAssemblyMCCodeEmitter::encodeInstruction(
86    const MCInst &MI, raw_ostream &OS, SmallVectorImpl<MCFixup> &Fixups,
87    const MCSubtargetInfo &STI) const {
88  assert(false && "FIXME: not implemented yet");
89}
90
91// Encode WebAssembly Memory Operand
92uint64_t
93WebAssemblyMCCodeEmitter::getMemoryOpValue(const MCInst &MI, unsigned Op,
94                                           SmallVectorImpl<MCFixup> &Fixups,
95                                           const MCSubtargetInfo &STI) const {
96  assert(false && "FIXME: not implemented yet");
97  return 0;
98}
99
100#include "WebAssemblyGenMCCodeEmitter.inc"
101