aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/llvm16/lib/MC/MCXCOFFStreamer.cpp
blob: 25a678c68416eb701d3531fbdc6db19050592adc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
//===- lib/MC/MCXCOFFStreamer.cpp - XCOFF Object Output -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file assembles .s files and emits XCOFF .o object files.
//
//===----------------------------------------------------------------------===//

#include "llvm/MC/MCXCOFFStreamer.h"
#include "llvm/BinaryFormat/XCOFF.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionXCOFF.h"
#include "llvm/MC/MCSymbolXCOFF.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/Casting.h"

using namespace llvm;

MCXCOFFStreamer::MCXCOFFStreamer(MCContext &Context,
                                 std::unique_ptr<MCAsmBackend> MAB,
                                 std::unique_ptr<MCObjectWriter> OW,
                                 std::unique_ptr<MCCodeEmitter> Emitter)
    : MCObjectStreamer(Context, std::move(MAB), std::move(OW),
                       std::move(Emitter)) {}

bool MCXCOFFStreamer::emitSymbolAttribute(MCSymbol *Sym,
                                          MCSymbolAttr Attribute) {
  auto *Symbol = cast<MCSymbolXCOFF>(Sym);
  getAssembler().registerSymbol(*Symbol);

  switch (Attribute) {
  // XCOFF doesn't support the cold feature.
  case MCSA_Cold:
    return false;

  case MCSA_Global:
  case MCSA_Extern:
    Symbol->setStorageClass(XCOFF::C_EXT);
    Symbol->setExternal(true);
    break;
  case MCSA_LGlobal:
    Symbol->setStorageClass(XCOFF::C_HIDEXT);
    Symbol->setExternal(true);
    break;
  case llvm::MCSA_Weak:
    Symbol->setStorageClass(XCOFF::C_WEAKEXT);
    Symbol->setExternal(true);
    break;
  case llvm::MCSA_Hidden:
    Symbol->setVisibilityType(XCOFF::SYM_V_HIDDEN);
    break;
  case llvm::MCSA_Protected:
    Symbol->setVisibilityType(XCOFF::SYM_V_PROTECTED);
    break;
  case llvm::MCSA_Exported:
    Symbol->setVisibilityType(XCOFF::SYM_V_EXPORTED);
    break;
  default:
    report_fatal_error("Not implemented yet.");
  }
  return true;
}

void MCXCOFFStreamer::emitXCOFFSymbolLinkageWithVisibility(
    MCSymbol *Symbol, MCSymbolAttr Linkage, MCSymbolAttr Visibility) {

  emitSymbolAttribute(Symbol, Linkage);

  // When the caller passes `MCSA_Invalid` for the visibility, do not emit one.
  if (Visibility == MCSA_Invalid)
    return;

  emitSymbolAttribute(Symbol, Visibility);
}

void MCXCOFFStreamer::emitXCOFFExceptDirective(const MCSymbol *Symbol,
                                               const MCSymbol *Trap,
                                               unsigned Lang, unsigned Reason,
                                               unsigned FunctionSize,
                                               bool hasDebug) {
  getAssembler().getWriter().addExceptionEntry(Symbol, Trap, Lang, Reason,
                                               FunctionSize, hasDebug);
}

void MCXCOFFStreamer::emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
                                       Align ByteAlignment) {
  getAssembler().registerSymbol(*Symbol);
  Symbol->setExternal(cast<MCSymbolXCOFF>(Symbol)->getStorageClass() !=
                      XCOFF::C_HIDEXT);
  Symbol->setCommon(Size, ByteAlignment);

  // Default csect align is 4, but common symbols have explicit alignment values
  // and we should honor it.
  cast<MCSymbolXCOFF>(Symbol)->getRepresentedCsect()->setAlignment(
      ByteAlignment);

  // Emit the alignment and storage for the variable to the section.
  emitValueToAlignment(ByteAlignment);
  emitZeros(Size);
}

void MCXCOFFStreamer::emitZerofill(MCSection *Section, MCSymbol *Symbol,
                                   uint64_t Size, Align ByteAlignment,
                                   SMLoc Loc) {
  report_fatal_error("Zero fill not implemented for XCOFF.");
}

void MCXCOFFStreamer::emitInstToData(const MCInst &Inst,
                                     const MCSubtargetInfo &STI) {
  MCAssembler &Assembler = getAssembler();
  SmallVector<MCFixup, 4> Fixups;
  SmallString<256> Code;
  raw_svector_ostream VecOS(Code);
  Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);

  // Add the fixups and data.
  MCDataFragment *DF = getOrCreateDataFragment(&STI);
  const size_t ContentsSize = DF->getContents().size();
  auto &DataFragmentFixups = DF->getFixups();
  for (auto &Fixup : Fixups) {
    Fixup.setOffset(Fixup.getOffset() + ContentsSize);
    DataFragmentFixups.push_back(Fixup);
  }

  DF->setHasInstructions(STI);
  DF->getContents().append(Code.begin(), Code.end());
}

MCStreamer *llvm::createXCOFFStreamer(MCContext &Context,
                                      std::unique_ptr<MCAsmBackend> &&MAB,
                                      std::unique_ptr<MCObjectWriter> &&OW,
                                      std::unique_ptr<MCCodeEmitter> &&CE,
                                      bool RelaxAll) {
  MCXCOFFStreamer *S = new MCXCOFFStreamer(Context, std::move(MAB),
                                           std::move(OW), std::move(CE));
  if (RelaxAll)
    S->getAssembler().setRelaxAll(true);
  return S;
}

void MCXCOFFStreamer::emitXCOFFLocalCommonSymbol(MCSymbol *LabelSym,
                                                 uint64_t Size,
                                                 MCSymbol *CsectSym,
                                                 Align Alignment) {
  emitCommonSymbol(CsectSym, Size, Alignment);
}