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
|
//===- MCSectionMachO.h - MachO Machine Code Sections -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the MCSectionMachO class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCSECTIONMACHO_H
#define LLVM_MC_MCSECTIONMACHO_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCSection.h"
namespace llvm {
/// MCSectionMachO - This represents a section on a Mach-O system (used by
/// Mac OS X). On a Mac system, these are also described in
/// /usr/include/mach-o/loader.h.
class MCSectionMachO : public MCSection {
char SegmentName[16]; // Not necessarily null terminated!
char SectionName[16]; // Not necessarily null terminated!
/// TypeAndAttributes - This is the SECTION_TYPE and SECTION_ATTRIBUTES
/// field of a section, drawn from the enums below.
unsigned TypeAndAttributes;
/// Reserved2 - The 'reserved2' field of a section, used to represent the
/// size of stubs, for example.
unsigned Reserved2;
MCSectionMachO(StringRef Segment, StringRef Section,
unsigned TAA, unsigned reserved2, SectionKind K);
friend class MCContext;
public:
/// These are the section type and attributes fields. A MachO section can
/// have only one Type, but can have any of the attributes specified.
enum LLVM_ENUM_INT_TYPE(uint32_t) {
// TypeAndAttributes bitmasks.
SECTION_TYPE = 0x000000FFU,
SECTION_ATTRIBUTES = 0xFFFFFF00U,
// Valid section types.
/// S_REGULAR - Regular section.
S_REGULAR = 0x00U,
/// S_ZEROFILL - Zero fill on demand section.
S_ZEROFILL = 0x01U,
/// S_CSTRING_LITERALS - Section with literal C strings.
S_CSTRING_LITERALS = 0x02U,
/// S_4BYTE_LITERALS - Section with 4 byte literals.
S_4BYTE_LITERALS = 0x03U,
/// S_8BYTE_LITERALS - Section with 8 byte literals.
S_8BYTE_LITERALS = 0x04U,
/// S_LITERAL_POINTERS - Section with pointers to literals.
S_LITERAL_POINTERS = 0x05U,
/// S_NON_LAZY_SYMBOL_POINTERS - Section with non-lazy symbol pointers.
S_NON_LAZY_SYMBOL_POINTERS = 0x06U,
/// S_LAZY_SYMBOL_POINTERS - Section with lazy symbol pointers.
S_LAZY_SYMBOL_POINTERS = 0x07U,
/// S_SYMBOL_STUBS - Section with symbol stubs, byte size of stub in
/// the Reserved2 field.
S_SYMBOL_STUBS = 0x08U,
/// S_MOD_INIT_FUNC_POINTERS - Section with only function pointers for
/// initialization.
S_MOD_INIT_FUNC_POINTERS = 0x09U,
/// S_MOD_TERM_FUNC_POINTERS - Section with only function pointers for
/// termination.
S_MOD_TERM_FUNC_POINTERS = 0x0AU,
/// S_COALESCED - Section contains symbols that are to be coalesced.
S_COALESCED = 0x0BU,
/// S_GB_ZEROFILL - Zero fill on demand section (that can be larger than 4
/// gigabytes).
S_GB_ZEROFILL = 0x0CU,
/// S_INTERPOSING - Section with only pairs of function pointers for
/// interposing.
S_INTERPOSING = 0x0DU,
/// S_16BYTE_LITERALS - Section with only 16 byte literals.
S_16BYTE_LITERALS = 0x0EU,
/// S_DTRACE_DOF - Section contains DTrace Object Format.
S_DTRACE_DOF = 0x0FU,
/// S_LAZY_DYLIB_SYMBOL_POINTERS - Section with lazy symbol pointers to
/// lazy loaded dylibs.
S_LAZY_DYLIB_SYMBOL_POINTERS = 0x10U,
/// S_THREAD_LOCAL_REGULAR - Section with ....
S_THREAD_LOCAL_REGULAR = 0x11U,
/// S_THREAD_LOCAL_ZEROFILL - Thread local zerofill section.
S_THREAD_LOCAL_ZEROFILL = 0x12U,
/// S_THREAD_LOCAL_VARIABLES - Section with thread local variable structure
/// data.
S_THREAD_LOCAL_VARIABLES = 0x13U,
/// S_THREAD_LOCAL_VARIABLE_POINTERS - Section with ....
S_THREAD_LOCAL_VARIABLE_POINTERS = 0x14U,
/// S_THREAD_LOCAL_INIT_FUNCTION_POINTERS - Section with thread local
/// variable initialization pointers to functions.
S_THREAD_LOCAL_INIT_FUNCTION_POINTERS = 0x15U,
LAST_KNOWN_SECTION_TYPE = S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
// Valid section attributes.
/// S_ATTR_PURE_INSTRUCTIONS - Section contains only true machine
/// instructions.
S_ATTR_PURE_INSTRUCTIONS = 1U << 31,
/// S_ATTR_NO_TOC - Section contains coalesced symbols that are not to be
/// in a ranlib table of contents.
S_ATTR_NO_TOC = 1U << 30,
/// S_ATTR_STRIP_STATIC_SYMS - Ok to strip static symbols in this section
/// in files with the MY_DYLDLINK flag.
S_ATTR_STRIP_STATIC_SYMS = 1U << 29,
/// S_ATTR_NO_DEAD_STRIP - No dead stripping.
S_ATTR_NO_DEAD_STRIP = 1U << 28,
/// S_ATTR_LIVE_SUPPORT - Blocks are live if they reference live blocks.
S_ATTR_LIVE_SUPPORT = 1U << 27,
/// S_ATTR_SELF_MODIFYING_CODE - Used with i386 code stubs written on by
/// dyld.
S_ATTR_SELF_MODIFYING_CODE = 1U << 26,
/// S_ATTR_DEBUG - A debug section.
S_ATTR_DEBUG = 1U << 25,
/// S_ATTR_SOME_INSTRUCTIONS - Section contains some machine instructions.
S_ATTR_SOME_INSTRUCTIONS = 1U << 10,
/// S_ATTR_EXT_RELOC - Section has external relocation entries.
S_ATTR_EXT_RELOC = 1U << 9,
/// S_ATTR_LOC_RELOC - Section has local relocation entries.
S_ATTR_LOC_RELOC = 1U << 8
};
StringRef getSegmentName() const {
// SegmentName is not necessarily null terminated!
if (SegmentName[15])
return StringRef(SegmentName, 16);
return StringRef(SegmentName);
}
StringRef getSectionName() const {
// SectionName is not necessarily null terminated!
if (SectionName[15])
return StringRef(SectionName, 16);
return StringRef(SectionName);
}
virtual std::string getLabelBeginName() const {
return StringRef(getSegmentName().str() + getSectionName().str() + "_begin");
}
virtual std::string getLabelEndName() const {
return StringRef(getSegmentName().str() + getSectionName().str() + "_end");
}
unsigned getTypeAndAttributes() const { return TypeAndAttributes; }
unsigned getStubSize() const { return Reserved2; }
unsigned getType() const { return TypeAndAttributes & SECTION_TYPE; }
bool hasAttribute(unsigned Value) const {
return (TypeAndAttributes & Value) != 0;
}
/// ParseSectionSpecifier - Parse the section specifier indicated by "Spec".
/// This is a string that can appear after a .section directive in a mach-o
/// flavored .s file. If successful, this fills in the specified Out
/// parameters and returns an empty string. When an invalid section
/// specifier is present, this returns a string indicating the problem.
/// If no TAA was parsed, TAA is not altered, and TAAWasSet becomes false.
static std::string ParseSectionSpecifier(StringRef Spec, // In.
StringRef &Segment, // Out.
StringRef &Section, // Out.
unsigned &TAA, // Out.
bool &TAAParsed, // Out.
unsigned &StubSize); // Out.
virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS,
const MCExpr *Subsection) const;
virtual bool UseCodeAlign() const;
virtual bool isVirtualSection() const;
static bool classof(const MCSection *S) {
return S->getVariant() == SV_MachO;
}
};
} // end namespace llvm
#endif
|
