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
|
//===- 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/MCContext.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/MC/MCAsmInfo.h"
using namespace llvm;
MCSectionELF *MCSectionELF::
Create(const StringRef &Section, unsigned Type, unsigned Flags,
SectionKind K, bool isExplicit, MCContext &Ctx) {
return new (Ctx) MCSectionELF(Section, Type, Flags, K, isExplicit);
}
// ShouldOmitSectionDirective - Decides whether a '.section' directive
// should be printed before the section name
bool MCSectionELF::ShouldOmitSectionDirective(const char *Name,
const MCAsmInfo &MAI) const {
// FIXME: Does .section .bss/.data/.text work everywhere??
if (strcmp(Name, ".text") == 0 ||
strcmp(Name, ".data") == 0 ||
(strcmp(Name, ".bss") == 0 &&
!MAI.usesELFSectionDirectiveForBSS()))
return true;
return false;
}
// ShouldPrintSectionType - Only prints the section type if supported
bool MCSectionELF::ShouldPrintSectionType(unsigned Ty) const {
if (IsExplicit && !(Ty == SHT_NOBITS || Ty == SHT_PROGBITS))
return false;
return true;
}
void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS) const {
if (ShouldOmitSectionDirective(SectionName.c_str(), MAI)) {
OS << '\t' << getSectionName() << '\n';
return;
}
OS << "\t.section\t" << getSectionName();
// Handle the weird solaris syntax if desired.
if (MAI.usesSunStyleELFSectionSwitchSyntax() &&
!(Flags & MCSectionELF::SHF_MERGE)) {
if (Flags & MCSectionELF::SHF_ALLOC)
OS << ",#alloc";
if (Flags & MCSectionELF::SHF_EXECINSTR)
OS << ",#execinstr";
if (Flags & MCSectionELF::SHF_WRITE)
OS << ",#write";
if (Flags & MCSectionELF::SHF_TLS)
OS << ",#tls";
} else {
OS << ",\"";
if (Flags & MCSectionELF::SHF_ALLOC)
OS << 'a';
if (Flags & MCSectionELF::SHF_EXECINSTR)
OS << 'x';
if (Flags & MCSectionELF::SHF_WRITE)
OS << 'w';
if (Flags & MCSectionELF::SHF_MERGE)
OS << 'M';
if (Flags & MCSectionELF::SHF_STRINGS)
OS << 'S';
if (Flags & MCSectionELF::SHF_TLS)
OS << 'T';
// If there are target-specific flags, print them.
if (Flags & ~MCSectionELF::TARGET_INDEP_SHF)
PrintTargetSpecificSectionFlags(MAI, OS);
OS << '"';
if (ShouldPrintSectionType(Type)) {
OS << ',';
// If comment string is '@', e.g. as on ARM - use '%' instead
if (MAI.getCommentString()[0] == '@')
OS << '%';
else
OS << '@';
if (Type == MCSectionELF::SHT_INIT_ARRAY)
OS << "init_array";
else if (Type == MCSectionELF::SHT_FINI_ARRAY)
OS << "fini_array";
else if (Type == MCSectionELF::SHT_PREINIT_ARRAY)
OS << "preinit_array";
else if (Type == MCSectionELF::SHT_NOBITS)
OS << "nobits";
else if (Type == MCSectionELF::SHT_PROGBITS)
OS << "progbits";
if (getKind().isMergeable1ByteCString()) {
OS << ",1";
} else if (getKind().isMergeable2ByteCString()) {
OS << ",2";
} else if (getKind().isMergeable4ByteCString() ||
getKind().isMergeableConst4()) {
OS << ",4";
} else if (getKind().isMergeableConst8()) {
OS << ",8";
} else if (getKind().isMergeableConst16()) {
OS << ",16";
}
}
}
OS << '\n';
}
// HasCommonSymbols - True if this section holds common symbols, this is
// indicated on the ELF object file by a symbol with SHN_COMMON section
// header index.
bool MCSectionELF::HasCommonSymbols() const {
if (strncmp(SectionName.c_str(), ".gnu.linkonce.", 14) == 0)
return true;
return false;
}
|
