LLVM  9.0.0svn
RISCVELFStreamer.cpp
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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"
15 #include "RISCVMCTargetDesc.h"
16 #include "Utils/RISCVBaseInfo.h"
17 #include "llvm/BinaryFormat/ELF.h"
19 
20 using namespace llvm;
21 
22 // This part is for ELF object output.
24  const MCSubtargetInfo &STI)
25  : RISCVTargetStreamer(S) {
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) {
39  case RISCVABI::ABI_LP64:
40  break;
44  break;
48  break;
50  EFlags |= ELF::EF_RISCV_RVE;
51  break;
53  llvm_unreachable("Improperly initialised target ABI");
54  }
55 
56  MCA.setELFHeaderEFlags(EFlags);
57 }
58 
60  return static_cast<MCELFStreamer &>(Streamer);
61 }
62 
void setELFHeaderEFlags(unsigned Flags)
Definition: MCAssembler.h:255
RISCVTargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI)
This class represents lattice values for constants.
Definition: AllocatorList.h:23
virtual void emitDirectiveOptionNoRelax()
const FeatureBitset & getFeatureBits() const
Streaming machine code generation interface.
Definition: MCStreamer.h:188
Container class for subtarget features.
MCAssembler & getAssembler()
unsigned getELFHeaderEFlags() const
ELF e_header flags.
Definition: MCAssembler.h:254
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
MCAsmBackend & getBackend() const
Definition: MCAssembler.h:292
MCStreamer & Streamer
Definition: MCStreamer.h:85
Generic base class for all target subtargets.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())