xref: /llvm-project/llvm/lib/Target/LoongArch/MCTargetDesc/LoongArchELFStreamer.cpp (revision 1a787b3c8e71eeb333825ec4b76c7440290142e4)
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 
21 using namespace llvm;
22 
23 // This part is for ELF object output.
24 LoongArchTargetELFStreamer::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(), STI.getFeatureBits(),
31       MAB.getTargetOptions().getABIName()));
32 }
33 
34 MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() {
35   return static_cast<MCELFStreamer &>(Streamer);
36 }
37 
38 void LoongArchTargetELFStreamer::emitDirectiveOptionPush() {}
39 void LoongArchTargetELFStreamer::emitDirectiveOptionPop() {}
40 void LoongArchTargetELFStreamer::emitDirectiveOptionRelax() {}
41 void LoongArchTargetELFStreamer::emitDirectiveOptionNoRelax() {}
42 
43 void 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 
77 namespace {
78 class LoongArchELFStreamer : public MCELFStreamer {
79 public:
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 
87 namespace llvm {
88 MCELFStreamer *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