lib/Target/RISCV/MCTargetDesc/RISCVELFStreamer.cpp

   1 //===-- RISCVELFStreamer.cpp - RISCV ELF Target Streamer Methods ----------===//
   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 // This file provides RISCV specific target streamer methods.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "RISCVELFStreamer.h"
  14 #include "MCTargetDesc/RISCVAsmBackend.h"
  15 #include "RISCVMCTargetDesc.h"
  16 #include "Utils/RISCVBaseInfo.h"
  17 #include "llvm/BinaryFormat/ELF.h"
  18 #include "llvm/MC/MCSubtargetInfo.h"
  19
  20 using namespace llvm;
  21
  22 // This part is for ELF object output.
  23 RISCVTargetELFStreamer::RISCVTargetELFStreamer(MCStreamer &S,
  24                                                const MCSubtargetInfo &STI)
  25     : RISCVTargetStreamer(S) {
  26   MCAssembler &MCA = getStreamer().getAssembler();
  27   const FeatureBitset &Features = STI.getFeatureBits();
  28   auto &MAB = static_cast<RISCVAsmBackend &>(MCA.getBackend());
  29   RISCVABI::ABI ABI = MAB.getTargetABI();
  30   assert(ABI != RISCVABI::ABI_Unknown && "Improperly initialised target ABI");
  31
  32   unsigned EFlags = MCA.getELFHeaderEFlags();
  33
  34   if (Features[RISCV::FeatureStdExtC])
  35     EFlags |= ELF::EF_RISCV_RVC;
  36
  37   switch (ABI) {
  38   case RISCVABI::ABI_ILP32:
  39   case RISCVABI::ABI_LP64:
  40     break;
  41   case RISCVABI::ABI_ILP32F:
  42   case RISCVABI::ABI_LP64F:
  43     EFlags |= ELF::EF_RISCV_FLOAT_ABI_SINGLE;
  44     break;
  45   case RISCVABI::ABI_ILP32D:
  46   case RISCVABI::ABI_LP64D:
  47     EFlags |= ELF::EF_RISCV_FLOAT_ABI_DOUBLE;
  48     break;
  49   case RISCVABI::ABI_ILP32E:
  50     EFlags |= ELF::EF_RISCV_RVE;
  51     break;
  52   case RISCVABI::ABI_Unknown:
  53     llvm_unreachable("Improperly initialised target ABI");
  54   }
  55
  56   MCA.setELFHeaderEFlags(EFlags);
  57 }
  58
  59 MCELFStreamer &RISCVTargetELFStreamer::getStreamer() {
  60   return static_cast<MCELFStreamer &>(Streamer);
  61 }
  62
  63 void RISCVTargetELFStreamer::emitDirectiveOptionPush() {}
  64 void RISCVTargetELFStreamer::emitDirectiveOptionPop() {}
  65 void RISCVTargetELFStreamer::emitDirectiveOptionRVC() {}
  66 void RISCVTargetELFStreamer::emitDirectiveOptionNoRVC() {}
  67 void RISCVTargetELFStreamer::emitDirectiveOptionRelax() {}
  68 void RISCVTargetELFStreamer::emitDirectiveOptionNoRelax() {}