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
|
//===-- DarwinTargetAsmInfo.cpp - Darwin asm properties ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines target asm properties related what form asm statements
// should take in general on Darwin-based targets
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Target/DarwinTargetAsmInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetData.h"
using namespace llvm;
DarwinTargetAsmInfo::DarwinTargetAsmInfo(const TargetMachine &TM)
: TargetAsmInfo(TM) {
CStringSection_ = getUnnamedSection("\t.cstring",
SectionFlags::Mergeable | SectionFlags::Strings);
FourByteConstantSection = getUnnamedSection("\t.literal4\n",
SectionFlags::Mergeable);
EightByteConstantSection = getUnnamedSection("\t.literal8\n",
SectionFlags::Mergeable);
// Note: 16-byte constant section is subtarget specific and should be provided
// there, if needed.
SixteenByteConstantSection = 0;
ReadOnlySection = getUnnamedSection("\t.const\n", SectionFlags::None);
TextCoalSection =
getNamedSection("\t__TEXT,__textcoal_nt,coalesced,pure_instructions",
SectionFlags::Code);
ConstTextCoalSection = getNamedSection("\t__TEXT,__const_coal,coalesced",
SectionFlags::None);
ConstDataCoalSection = getNamedSection("\t__DATA,__const_coal,coalesced",
SectionFlags::None);
ConstDataSection = getUnnamedSection(".const_data", SectionFlags::None);
DataCoalSection = getNamedSection("\t__DATA,__datacoal_nt,coalesced",
SectionFlags::Writeable);
}
/// emitUsedDirectiveFor - On Darwin, internally linked data beginning with
/// the PrivateGlobalPrefix or the LessPrivateGlobalPrefix does not have the
/// directive emitted (this occurs in ObjC metadata).
bool
DarwinTargetAsmInfo::emitUsedDirectiveFor(const GlobalValue* GV,
Mangler *Mang) const {
if (GV==0)
return false;
if (GV->hasLocalLinkage() && !isa<Function>(GV) &&
((strlen(getPrivateGlobalPrefix()) != 0 &&
Mang->getValueName(GV).substr(0,strlen(getPrivateGlobalPrefix())) ==
getPrivateGlobalPrefix()) ||
(strlen(getLessPrivateGlobalPrefix()) != 0 &&
Mang->getValueName(GV).substr(0,strlen(getLessPrivateGlobalPrefix())) ==
getLessPrivateGlobalPrefix())))
return false;
return true;
}
const Section*
DarwinTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
SectionKind::Kind Kind = SectionKindForGlobal(GV);
bool isWeak = GV->mayBeOverridden();
bool isNonStatic = TM.getRelocationModel() != Reloc::Static;
switch (Kind) {
case SectionKind::Text:
if (isWeak)
return TextCoalSection;
else
return TextSection;
case SectionKind::Data:
case SectionKind::ThreadData:
case SectionKind::BSS:
case SectionKind::ThreadBSS:
if (cast<GlobalVariable>(GV)->isConstant())
return (isWeak ? ConstDataCoalSection : ConstDataSection);
else
return (isWeak ? DataCoalSection : DataSection);
case SectionKind::ROData:
return (isWeak ? ConstDataCoalSection :
(isNonStatic ? ConstDataSection : getReadOnlySection()));
case SectionKind::RODataMergeStr:
return (isWeak ?
ConstTextCoalSection :
MergeableStringSection(cast<GlobalVariable>(GV)));
case SectionKind::RODataMergeConst:
return (isWeak ?
ConstDataCoalSection:
MergeableConstSection(cast<GlobalVariable>(GV)));
default:
assert(0 && "Unsuported section kind for global");
}
// FIXME: Do we have any extra special weird cases?
return NULL;
}
const Section*
DarwinTargetAsmInfo::MergeableStringSection(const GlobalVariable *GV) const {
const TargetData *TD = TM.getTargetData();
Constant *C = cast<GlobalVariable>(GV)->getInitializer();
const Type *Ty = cast<ArrayType>(C->getType())->getElementType();
unsigned Size = TD->getTypePaddedSize(Ty);
if (Size) {
unsigned Align = TD->getPreferredAlignment(GV);
if (Align <= 32)
return getCStringSection_();
}
return getReadOnlySection();
}
const Section*
DarwinTargetAsmInfo::MergeableConstSection(const GlobalVariable *GV) const {
Constant *C = GV->getInitializer();
return MergeableConstSection(C->getType());
}
inline const Section*
DarwinTargetAsmInfo::MergeableConstSection(const Type *Ty) const {
const TargetData *TD = TM.getTargetData();
unsigned Size = TD->getTypePaddedSize(Ty);
if (Size == 4)
return FourByteConstantSection;
else if (Size == 8)
return EightByteConstantSection;
else if (Size == 16 && SixteenByteConstantSection)
return SixteenByteConstantSection;
return getReadOnlySection();
}
const Section*
DarwinTargetAsmInfo::SelectSectionForMachineConst(const Type *Ty) const {
const Section* S = MergeableConstSection(Ty);
// Handle weird special case, when compiling PIC stuff.
if (S == getReadOnlySection() &&
TM.getRelocationModel() != Reloc::Static)
return ConstDataSection;
return S;
}
std::string
DarwinTargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
SectionKind::Kind kind) const {
assert(0 && "Darwin does not use unique sections");
return "";
}
|
