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
| //===- MCSymbolMachO.h - ---------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSYMBOLMACHO_H
#define LLVM_MC_MCSYMBOLMACHO_H
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCSymbol.h"
namespace llvm {
class MCSymbolMachO : public MCSymbol {
/// We store the value for the 'desc' symbol field in the
/// lowest 16 bits of the implementation defined flags.
enum MachOSymbolFlags : uint16_t { // See <mach-o/nlist.h>.
SF_DescFlagsMask = 0xFFFF,
// Reference type flags.
SF_ReferenceTypeMask = 0x0007,
SF_ReferenceTypeUndefinedNonLazy = 0x0000,
SF_ReferenceTypeUndefinedLazy = 0x0001,
SF_ReferenceTypeDefined = 0x0002,
SF_ReferenceTypePrivateDefined = 0x0003,
SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
// Other 'desc' flags.
SF_ThumbFunc = 0x0008,
SF_NoDeadStrip = 0x0020,
SF_WeakReference = 0x0040,
SF_WeakDefinition = 0x0080,
SF_SymbolResolver = 0x0100,
SF_AltEntry = 0x0200,
SF_Cold = 0x0400,
// Common alignment
SF_CommonAlignmentMask = 0xF0FF,
SF_CommonAlignmentShift = 8
};
public:
MCSymbolMachO(const StringMapEntry<bool> *Name, bool isTemporary)
: MCSymbol(SymbolKindMachO, Name, isTemporary) {}
// Reference type methods.
void clearReferenceType() const {
modifyFlags(0, SF_ReferenceTypeMask);
}
void setReferenceTypeUndefinedLazy(bool Value) const {
modifyFlags(Value ? SF_ReferenceTypeUndefinedLazy : 0,
SF_ReferenceTypeUndefinedLazy);
}
// Other 'desc' methods.
void setThumbFunc() const {
modifyFlags(SF_ThumbFunc, SF_ThumbFunc);
}
bool isNoDeadStrip() const {
return getFlags() & SF_NoDeadStrip;
}
void setNoDeadStrip() const {
modifyFlags(SF_NoDeadStrip, SF_NoDeadStrip);
}
bool isWeakReference() const {
return getFlags() & SF_WeakReference;
}
void setWeakReference() const {
modifyFlags(SF_WeakReference, SF_WeakReference);
}
bool isWeakDefinition() const {
return getFlags() & SF_WeakDefinition;
}
void setWeakDefinition() const {
modifyFlags(SF_WeakDefinition, SF_WeakDefinition);
}
bool isSymbolResolver() const {
return getFlags() & SF_SymbolResolver;
}
void setSymbolResolver() const {
modifyFlags(SF_SymbolResolver, SF_SymbolResolver);
}
void setAltEntry() const {
modifyFlags(SF_AltEntry, SF_AltEntry);
}
bool isAltEntry() const {
return getFlags() & SF_AltEntry;
}
void setCold() const { modifyFlags(SF_Cold, SF_Cold); }
bool isCold() const { return getFlags() & SF_Cold; }
void setDesc(unsigned Value) const {
assert(Value == (Value & SF_DescFlagsMask) &&
"Invalid .desc value!");
setFlags(Value & SF_DescFlagsMask);
}
/// Get the encoded value of the flags as they will be emitted in to
/// the MachO binary
uint16_t getEncodedFlags(bool EncodeAsAltEntry) const {
uint16_t Flags = getFlags();
// Common alignment is packed into the 'desc' bits.
if (isCommon()) {
if (unsigned Align = getCommonAlignment()) {
unsigned Log2Size = Log2_32(Align);
assert((1U << Log2Size) == Align && "Invalid 'common' alignment!");
if (Log2Size > 15)
report_fatal_error("invalid 'common' alignment '" +
Twine(Align) + "' for '" + getName() + "'",
false);
Flags = (Flags & SF_CommonAlignmentMask) |
(Log2Size << SF_CommonAlignmentShift);
}
}
if (EncodeAsAltEntry)
Flags |= SF_AltEntry;
return Flags;
}
static bool classof(const MCSymbol *S) { return S->isMachO(); }
};
}
#endif
|