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/MCELFObjectWriter.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 TT: STI.getTargetTriple(), FeatureBits: STI.getFeatureBits(),
31 ABIName: MAB.getTargetOptions().getABIName()));
32}
33
34MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() {
35 return static_cast<MCELFStreamer &>(Streamer);
36}
37
38void LoongArchTargetELFStreamer::emitDirectiveOptionPush() {}
39void LoongArchTargetELFStreamer::emitDirectiveOptionPop() {}
40void LoongArchTargetELFStreamer::emitDirectiveOptionRelax() {}
41void LoongArchTargetELFStreamer::emitDirectiveOptionNoRelax() {}
42
43void LoongArchTargetELFStreamer::finish() {
44 LoongArchTargetStreamer::finish();
45 ELFObjectWriter &W = getStreamer().getWriter();
46 LoongArchABI::ABI ABI = getTargetABI();
47
48 // Figure out the e_flags.
49 //
50 // Bitness is already represented with the EI_CLASS byte in the current spec,
51 // so here we only record the base ABI modifier. Also set the object file ABI
52 // version to v1, as upstream LLVM cannot handle the previous stack-machine-
53 // based relocs from day one.
54 //
55 // Refer to LoongArch ELF psABI v2.01 for details.
56 unsigned EFlags = W.getELFHeaderEFlags();
57 EFlags |= ELF::EF_LOONGARCH_OBJABI_V1;
58 switch (ABI) {
59 case LoongArchABI::ABI_ILP32S:
60 case LoongArchABI::ABI_LP64S:
61 EFlags |= ELF::EF_LOONGARCH_ABI_SOFT_FLOAT;
62 break;
63 case LoongArchABI::ABI_ILP32F:
64 case LoongArchABI::ABI_LP64F:
65 EFlags |= ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT;
66 break;
67 case LoongArchABI::ABI_ILP32D:
68 case LoongArchABI::ABI_LP64D:
69 EFlags |= ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT;
70 break;
71 case LoongArchABI::ABI_Unknown:
72 llvm_unreachable("Improperly initialized target ABI");
73 }
74 W.setELFHeaderEFlags(EFlags);
75}
76
77namespace {
78class LoongArchELFStreamer : public MCELFStreamer {
79public:
80 LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB,
81 std::unique_ptr<MCObjectWriter> MOW,
82 std::unique_ptr<MCCodeEmitter> MCE)
83 : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
84};
85} // end namespace
86
87namespace llvm {
88MCELFStreamer *createLoongArchELFStreamer(MCContext &C,
89 std::unique_ptr<MCAsmBackend> MAB,
90 std::unique_ptr<MCObjectWriter> MOW,
91 std::unique_ptr<MCCodeEmitter> MCE) {
92 LoongArchELFStreamer *S = new LoongArchELFStreamer(
93 C, std::move(MAB), std::move(MOW), std::move(MCE));
94 return S;
95}
96} // end namespace llvm
97