WebAssemblyAsmPrinter.h

Go to the documentation of this file.

// WebAssemblyAsmPrinter.h - WebAssembly implementation of AsmPrinter-*- C++ -*-
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYASMPRINTER_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYASMPRINTER_H

#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblySubtarget.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Target/TargetMachine.h"

namespace llvm {
class MCSymbol;
class WebAssemblyTargetStreamer;
class WebAssemblyMCInstLower;

class LLVM_LIBRARY_VISIBILITY WebAssemblyAsmPrinter final : public AsmPrinter {
  const WebAssemblySubtarget *Subtarget;
  const MachineRegisterInfo *MRI;
  WebAssemblyFunctionInfo *MFI;
  // TODO: Do the uniquing of Signatures here instead of ObjectFileWriter?
  std::vector<std::unique_ptr<wasm::WasmSignature>> Signatures;

public:
  explicit WebAssemblyAsmPrinter(TargetMachine &TM,
                                 std::unique_ptr<MCStreamer> Streamer)
      : AsmPrinter(TM, std::move(Streamer)), Subtarget(nullptr), MRI(nullptr),
        MFI(nullptr) {}

  StringRef getPassName() const override {
    return "WebAssembly Assembly Printer";
  }

  const WebAssemblySubtarget &getSubtarget() const { return *Subtarget; }
  void addSignature(std::unique_ptr<wasm::WasmSignature> &&Sig) {
    Signatures.push_back(std::move(Sig));
  }

  //===------------------------------------------------------------------===//
  // MachineFunctionPass Implementation.
  //===------------------------------------------------------------------===//

  bool runOnMachineFunction(MachineFunction &MF) override {
    Subtarget = &MF.getSubtarget<WebAssemblySubtarget>();
    MRI = &MF.getRegInfo();
    MFI = MF.getInfo<WebAssemblyFunctionInfo>();
    return AsmPrinter::runOnMachineFunction(MF);
  }

  //===------------------------------------------------------------------===//
  // AsmPrinter Implementation.
  //===------------------------------------------------------------------===//

  void EmitEndOfAsmFile(Module &M) override;
  void EmitJumpTableInfo() override;
  void EmitConstantPool() override;
  void EmitFunctionBodyStart() override;
  void EmitInstruction(const MachineInstr *MI) override;
  const MCExpr *lowerConstant(const Constant *CV) override;
  bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                       unsigned AsmVariant, const char *ExtraCode,
                       raw_ostream &OS) override;
  bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
                             unsigned AsmVariant, const char *ExtraCode,
                             raw_ostream &OS) override;

  MVT getRegType(unsigned RegNo) const;
  std::string regToString(const MachineOperand &MO);
  WebAssemblyTargetStreamer *getTargetStreamer();
};

} // end namespace llvm

#endif