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
|
//===- lib/MC/MCSectionELF.cpp - ELF Code Section Representation ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
MCSectionELF::~MCSectionELF() {} // anchor.
// 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;
// FIXME: Does .section .bss/.data/.text work everywhere??
if (Name == ".text" || Name == ".data" ||
(Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS()))
return true;
return false;
}
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,
raw_ostream &OS,
const MCExpr *Subsection) const {
if (ShouldOmitSectionDirective(SectionName, MAI)) {
OS << '\t' << getSectionName();
if (Subsection)
OS << '\t' << *Subsection;
OS << '\n';
return;
}
OS << "\t.section\t";
printName(OS, getSectionName());
// 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 there are target-specific flags, print them.
if (Flags & ELF::XCORE_SHF_CP_SECTION)
OS << 'c';
if (Flags & ELF::XCORE_SHF_DP_SECTION)
OS << 'd';
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";
if (EntrySize) {
assert(Flags & ELF::SHF_MERGE);
OS << "," << EntrySize;
}
if (Flags & ELF::SHF_GROUP) {
OS << ",";
printName(OS, Group->getName());
OS << ",comdat";
}
if (isUnique())
OS << ",unique," << UniqueID;
OS << '\n';
if (Subsection)
OS << "\t.subsection\t" << *Subsection << '\n';
}
bool MCSectionELF::UseCodeAlign() const {
return getFlags() & ELF::SHF_EXECINSTR;
}
bool MCSectionELF::isVirtualSection() const {
return getType() == ELF::SHT_NOBITS;
}
|
