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"
25 using namespace llvm;
26
27 #define DEBUG_TYPE "mccodeemitter"
28
29 namespace {
30 class WebAssemblyMCCodeEmitter final : public MCCodeEmitter {
31 const MCRegisterInfo &MRI;
32
33 public:
WebAssemblyMCCodeEmitter(const MCInstrInfo &,const MCRegisterInfo & mri,MCContext &)34 WebAssemblyMCCodeEmitter(const MCInstrInfo &, const MCRegisterInfo &mri,
35 MCContext &)
36 : MRI(mri) {}
37
~WebAssemblyMCCodeEmitter()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
createWebAssemblyMCCodeEmitter(const MCInstrInfo & MCII,const MCRegisterInfo & MRI,MCContext & Ctx)62 MCCodeEmitter *llvm::createWebAssemblyMCCodeEmitter(const MCInstrInfo &MCII,
63 const MCRegisterInfo &MRI,
64 MCContext &Ctx) {
65 return new WebAssemblyMCCodeEmitter(MCII, MRI, Ctx);
66 }
67
getMachineOpValue(const MCInst & MI,const MCOperand & MO,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const68 unsigned 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
encodeInstruction(const MCInst & MI,raw_ostream & OS,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const85 void 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
92 uint64_t
getMemoryOpValue(const MCInst & MI,unsigned Op,SmallVectorImpl<MCFixup> & Fixups,const MCSubtargetInfo & STI) const93 WebAssemblyMCCodeEmitter::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