1//===-- LoongArchELFStreamer.cpp - LoongArch 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 LoongArch specific target streamer methods.
10//
11//===----------------------------------------------------------------------===//
12
13#include "LoongArchELFStreamer.h"
14#include "LoongArchAsmBackend.h"
15#include "LoongArchBaseInfo.h"
16#include "llvm/BinaryFormat/ELF.h"
17#include "llvm/MC/MCAssembler.h"
18#include "llvm/MC/MCCodeEmitter.h"
19#include "llvm/MC/MCObjectWriter.h"
20
21using namespace llvm;
22
23// This part is for ELF object output.
24LoongArchTargetELFStreamer::LoongArchTargetELFStreamer(
25    MCStreamer &S, const MCSubtargetInfo &STI)
26    : LoongArchTargetStreamer(S) {
27  auto &MAB = static_cast<LoongArchAsmBackend &>(
28      getStreamer().getAssembler().getBackend());
29  setTargetABI(LoongArchABI::computeTargetABI(
30      STI.getTargetTriple(), MAB.getTargetOptions().getABIName()));
31}
32
33MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() {
34  return static_cast<MCELFStreamer &>(Streamer);
35}
36
37void LoongArchTargetELFStreamer::finish() {
38  LoongArchTargetStreamer::finish();
39  MCAssembler &MCA = getStreamer().getAssembler();
40  LoongArchABI::ABI ABI = getTargetABI();
41
42  // Figure out the e_flags.
43  //
44  // Bitness is already represented with the EI_CLASS byte in the current spec,
45  // so here we only record the base ABI modifier. Also set the object file ABI
46  // version to v1, as upstream LLVM cannot handle the previous stack-machine-
47  // based relocs from day one.
48  //
49  // Refer to LoongArch ELF psABI v2.01 for details.
50  unsigned EFlags = MCA.getELFHeaderEFlags();
51  EFlags |= ELF::EF_LOONGARCH_OBJABI_V1;
52  switch (ABI) {
53  case LoongArchABI::ABI_ILP32S:
54  case LoongArchABI::ABI_LP64S:
55    EFlags |= ELF::EF_LOONGARCH_ABI_SOFT_FLOAT;
56    break;
57  case LoongArchABI::ABI_ILP32F:
58  case LoongArchABI::ABI_LP64F:
59    EFlags |= ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT;
60    break;
61  case LoongArchABI::ABI_ILP32D:
62  case LoongArchABI::ABI_LP64D:
63    EFlags |= ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT;
64    break;
65  case LoongArchABI::ABI_Unknown:
66    llvm_unreachable("Improperly initialized target ABI");
67  }
68  MCA.setELFHeaderEFlags(EFlags);
69}
70
71namespace {
72class LoongArchELFStreamer : public MCELFStreamer {
73public:
74  LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB,
75                       std::unique_ptr<MCObjectWriter> MOW,
76                       std::unique_ptr<MCCodeEmitter> MCE)
77      : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
78};
79} // end namespace
80
81namespace llvm {
82MCELFStreamer *createLoongArchELFStreamer(MCContext &C,
83                                          std::unique_ptr<MCAsmBackend> MAB,
84                                          std::unique_ptr<MCObjectWriter> MOW,
85                                          std::unique_ptr<MCCodeEmitter> MCE,
86                                          bool RelaxAll) {
87  LoongArchELFStreamer *S = new LoongArchELFStreamer(
88      C, std::move(MAB), std::move(MOW), std::move(MCE));
89  S->getAssembler().setRelaxAll(RelaxAll);
90  return S;
91}
92} // end namespace llvm
93