1 //===-- HexagonAsmBackend.cpp - Hexagon Assembler Backend -----------------===// 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 #include "HexagonMCTargetDesc.h" 11 #include "llvm/MC/MCAsmBackend.h" 12 #include "llvm/MC/MCELFObjectWriter.h" 13 14 using namespace llvm; 15 16 namespace { 17 18 class HexagonAsmBackend : public MCAsmBackend { 19 public: 20 HexagonAsmBackend(Target const & /*T*/) {} 21 22 unsigned getNumFixupKinds() const override { return 0; } 23 24 void applyFixup(MCFixup const & /*Fixup*/, char * /*Data*/, 25 unsigned /*DataSize*/, uint64_t /*Value*/, 26 bool /*IsPCRel*/) const override { 27 return; 28 } 29 30 bool mayNeedRelaxation(MCInst const & /*Inst*/) const override { 31 return false; 32 } 33 34 bool fixupNeedsRelaxation(MCFixup const & /*Fixup*/, uint64_t /*Value*/, 35 MCRelaxableFragment const * /*DF*/, 36 MCAsmLayout const & /*Layout*/) const override { 37 llvm_unreachable("fixupNeedsRelaxation() unimplemented"); 38 } 39 40 void relaxInstruction(MCInst const & /*Inst*/, 41 MCInst & /*Res*/) const override { 42 llvm_unreachable("relaxInstruction() unimplemented"); 43 } 44 45 bool writeNopData(uint64_t /*Count*/, 46 MCObjectWriter * /*OW*/) const override { 47 return true; 48 } 49 }; 50 } // end anonymous namespace 51 52 namespace { 53 class ELFHexagonAsmBackend : public HexagonAsmBackend { 54 uint8_t OSABI; 55 56 public: 57 ELFHexagonAsmBackend(Target const &T, uint8_t OSABI) 58 : HexagonAsmBackend(T), OSABI(OSABI) {} 59 60 MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override { 61 StringRef CPU("HexagonV4"); 62 return createHexagonELFObjectWriter(OS, OSABI, CPU); 63 } 64 }; 65 } // end anonymous namespace 66 67 namespace llvm { 68 MCAsmBackend *createHexagonAsmBackend(Target const &T, 69 MCRegisterInfo const & /*MRI*/, 70 StringRef TT, StringRef /*CPU*/) { 71 uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS()); 72 return new ELFHexagonAsmBackend(T, OSABI); 73 } 74 } 75
