aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/llvm12/lib/MC/MCSectionELF.cpp
blob: 27694cb144195977107ffc2cfe792fc9cac1b80d (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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
//===- lib/MC/MCSectionELF.cpp - ELF Code Section Representation ----------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "llvm/MC/MCSectionELF.h"
#include "llvm/ADT/Triple.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>

using namespace llvm;

// Decides whether a '.section' directive
// should be printed before the section name.
bool MCSectionELF::ShouldOmitSectionDirective(StringRef Name,
                                              const MCAsmInfo &MAI) const {
  if (isUnique())
    return false;

  return MAI.shouldOmitSectionDirective(Name);
}

static void printName(raw_ostream &OS, StringRef Name) {
  if (Name.find_first_not_of("0123456789_."
                             "abcdefghijklmnopqrstuvwxyz"
                             "ABCDEFGHIJKLMNOPQRSTUVWXYZ") == Name.npos) {
    OS << Name;
    return;
  }
  OS << '"';
  for (const char *B = Name.begin(), *E = Name.end(); B < E; ++B) {
    if (*B == '"') // Unquoted "
      OS << "\\\"";
    else if (*B != '\\') // Neither " or backslash
      OS << *B;
    else if (B + 1 == E) // Trailing backslash
      OS << "\\\\";
    else {
      OS << B[0] << B[1]; // Quoted character
      ++B;
    }
  }
  OS << '"';
}

void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI, const Triple &T,
                                        raw_ostream &OS,
                                        const MCExpr *Subsection) const {
  if (ShouldOmitSectionDirective(getName(), MAI)) {
    OS << '\t' << getName();
    if (Subsection) {
      OS << '\t';
      Subsection->print(OS, &MAI);
    }
    OS << '\n';
    return;
  }

  OS << "\t.section\t";
  printName(OS, getName());

  // Handle the weird solaris syntax if desired.
  if (MAI.usesSunStyleELFSectionSwitchSyntax() &&
      !(Flags & ELF::SHF_MERGE)) {
    if (Flags & ELF::SHF_ALLOC)
      OS << ",#alloc";
    if (Flags & ELF::SHF_EXECINSTR)
      OS << ",#execinstr";
    if (Flags & ELF::SHF_WRITE)
      OS << ",#write";
    if (Flags & ELF::SHF_EXCLUDE)
      OS << ",#exclude";
    if (Flags & ELF::SHF_TLS)
      OS << ",#tls";
    OS << '\n';
    return;
  }

  OS << ",\"";
  if (Flags & ELF::SHF_ALLOC)
    OS << 'a';
  if (Flags & ELF::SHF_EXCLUDE)
    OS << 'e';
  if (Flags & ELF::SHF_EXECINSTR)
    OS << 'x';
  if (Flags & ELF::SHF_GROUP)
    OS << 'G';
  if (Flags & ELF::SHF_WRITE)
    OS << 'w';
  if (Flags & ELF::SHF_MERGE)
    OS << 'M';
  if (Flags & ELF::SHF_STRINGS)
    OS << 'S';
  if (Flags & ELF::SHF_TLS)
    OS << 'T';
  if (Flags & ELF::SHF_LINK_ORDER)
    OS << 'o';

  // If there are target-specific flags, print them.
  Triple::ArchType Arch = T.getArch();
  if (Arch == Triple::xcore) {
    if (Flags & ELF::XCORE_SHF_CP_SECTION)
      OS << 'c';
    if (Flags & ELF::XCORE_SHF_DP_SECTION)
      OS << 'd';
  } else if (T.isARM() || T.isThumb()) {
    if (Flags & ELF::SHF_ARM_PURECODE)
      OS << 'y';
  } else if (Arch == Triple::hexagon) {
    if (Flags & ELF::SHF_HEX_GPREL)
      OS << 's';
  }

  OS << '"';

  OS << ',';

  // If comment string is '@', e.g. as on ARM - use '%' instead
  if (MAI.getCommentString()[0] == '@')
    OS << '%';
  else
    OS << '@';

  if (Type == ELF::SHT_INIT_ARRAY)
    OS << "init_array";
  else if (Type == ELF::SHT_FINI_ARRAY)
    OS << "fini_array";
  else if (Type == ELF::SHT_PREINIT_ARRAY)
    OS << "preinit_array";
  else if (Type == ELF::SHT_NOBITS)
    OS << "nobits";
  else if (Type == ELF::SHT_NOTE)
    OS << "note";
  else if (Type == ELF::SHT_PROGBITS)
    OS << "progbits";
  else if (Type == ELF::SHT_X86_64_UNWIND)
    OS << "unwind";
  else if (Type == ELF::SHT_MIPS_DWARF)
    // Print hex value of the flag while we do not have
    // any standard symbolic representation of the flag.
    OS << "0x7000001e";
  else if (Type == ELF::SHT_LLVM_ODRTAB)
    OS << "llvm_odrtab";
  else if (Type == ELF::SHT_LLVM_LINKER_OPTIONS)
    OS << "llvm_linker_options";
  else if (Type == ELF::SHT_LLVM_CALL_GRAPH_PROFILE)
    OS << "llvm_call_graph_profile";
  else if (Type == ELF::SHT_LLVM_DEPENDENT_LIBRARIES)
    OS << "llvm_dependent_libraries";
  else if (Type == ELF::SHT_LLVM_SYMPART)
    OS << "llvm_sympart";
  else if (Type == ELF::SHT_LLVM_BB_ADDR_MAP)
    OS << "llvm_bb_addr_map";
  else
    report_fatal_error("unsupported type 0x" + Twine::utohexstr(Type) +
                       " for section " + getName());

  if (EntrySize) {
    assert(Flags & ELF::SHF_MERGE);
    OS << "," << EntrySize;
  }

  if (Flags & ELF::SHF_GROUP) {
    OS << ",";
    printName(OS, Group->getName());
    OS << ",comdat";
  }

  if (Flags & ELF::SHF_LINK_ORDER) {
    OS << ",";
    if (LinkedToSym)
      printName(OS, LinkedToSym->getName());
    else
      OS << '0';
  }

  if (isUnique())
    OS << ",unique," << UniqueID;

  OS << '\n';

  if (Subsection) {
    OS << "\t.subsection\t";
    Subsection->print(OS, &MAI);
    OS << '\n';
  }
}

bool MCSectionELF::UseCodeAlign() const {
  return getFlags() & ELF::SHF_EXECINSTR;
}

bool MCSectionELF::isVirtualSection() const {
  return getType() == ELF::SHT_NOBITS;
}

StringRef MCSectionELF::getVirtualSectionKind() const { return "SHT_NOBITS"; }