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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
#pragma once
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif
//===- SymbolicFile.h - Interface that only provides symbols ----*- 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
//
//===----------------------------------------------------------------------===//
//
// This file declares the SymbolicFile interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_SYMBOLICFILE_H
#define LLVM_OBJECT_SYMBOLICFILE_H
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/Object/Binary.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryBuffer.h"
#include <cinttypes>
#include <cstdint>
#include <cstring>
#include <iterator>
#include <memory>
#include <system_error>
namespace llvm {
namespace object {
union DataRefImpl {
// This entire union should probably be a
// char[max(8, sizeof(uintptr_t))] and require the impl to cast.
struct {
uint32_t a, b;
} d;
uintptr_t p;
DataRefImpl() { std::memset(this, 0, sizeof(DataRefImpl)); }
};
template <typename OStream>
OStream& operator<<(OStream &OS, const DataRefImpl &D) {
OS << "(" << format("0x%08" PRIxPTR, D.p) << " (" << format("0x%08x", D.d.a)
<< ", " << format("0x%08x", D.d.b) << "))";
return OS;
}
inline bool operator==(const DataRefImpl &a, const DataRefImpl &b) {
// Check bitwise identical. This is the only legal way to compare a union w/o
// knowing which member is in use.
return std::memcmp(&a, &b, sizeof(DataRefImpl)) == 0;
}
inline bool operator!=(const DataRefImpl &a, const DataRefImpl &b) {
return !operator==(a, b);
}
inline bool operator<(const DataRefImpl &a, const DataRefImpl &b) {
// Check bitwise identical. This is the only legal way to compare a union w/o
// knowing which member is in use.
return std::memcmp(&a, &b, sizeof(DataRefImpl)) < 0;
}
template <class content_type>
class content_iterator
: public std::iterator<std::forward_iterator_tag, content_type> {
content_type Current;
public:
content_iterator(content_type symb) : Current(std::move(symb)) {}
const content_type *operator->() const { return &Current; }
const content_type &operator*() const { return Current; }
bool operator==(const content_iterator &other) const {
return Current == other.Current;
}
bool operator!=(const content_iterator &other) const {
return !(*this == other);
}
content_iterator &operator++() { // preincrement
Current.moveNext();
return *this;
}
};
class SymbolicFile;
/// This is a value type class that represents a single symbol in the list of
/// symbols in the object file.
class BasicSymbolRef {
DataRefImpl SymbolPimpl;
const SymbolicFile *OwningObject = nullptr;
public:
enum Flags : unsigned {
SF_None = 0,
SF_Undefined = 1U << 0, // Symbol is defined in another object file
SF_Global = 1U << 1, // Global symbol
SF_Weak = 1U << 2, // Weak symbol
SF_Absolute = 1U << 3, // Absolute symbol
SF_Common = 1U << 4, // Symbol has common linkage
SF_Indirect = 1U << 5, // Symbol is an alias to another symbol
SF_Exported = 1U << 6, // Symbol is visible to other DSOs
SF_FormatSpecific = 1U << 7, // Specific to the object file format
// (e.g. section symbols)
SF_Thumb = 1U << 8, // Thumb symbol in a 32-bit ARM binary
SF_Hidden = 1U << 9, // Symbol has hidden visibility
SF_Const = 1U << 10, // Symbol value is constant
SF_Executable = 1U << 11, // Symbol points to an executable section
// (IR only)
};
BasicSymbolRef() = default;
BasicSymbolRef(DataRefImpl SymbolP, const SymbolicFile *Owner);
bool operator==(const BasicSymbolRef &Other) const;
bool operator<(const BasicSymbolRef &Other) const;
void moveNext();
Error printName(raw_ostream &OS) const;
/// Get symbol flags (bitwise OR of SymbolRef::Flags)
Expected<uint32_t> getFlags() const;
DataRefImpl getRawDataRefImpl() const;
const SymbolicFile *getObject() const;
};
using basic_symbol_iterator = content_iterator<BasicSymbolRef>;
class SymbolicFile : public Binary {
public:
SymbolicFile(unsigned int Type, MemoryBufferRef Source);
~SymbolicFile() override;
// virtual interface.
virtual void moveSymbolNext(DataRefImpl &Symb) const = 0;
virtual Error printSymbolName(raw_ostream &OS, DataRefImpl Symb) const = 0;
virtual Expected<uint32_t> getSymbolFlags(DataRefImpl Symb) const = 0;
virtual basic_symbol_iterator symbol_begin() const = 0;
virtual basic_symbol_iterator symbol_end() const = 0;
// convenience wrappers.
using basic_symbol_iterator_range = iterator_range<basic_symbol_iterator>;
basic_symbol_iterator_range symbols() const {
return basic_symbol_iterator_range(symbol_begin(), symbol_end());
}
// construction aux.
static Expected<std::unique_ptr<SymbolicFile>>
createSymbolicFile(MemoryBufferRef Object, llvm::file_magic Type,
LLVMContext *Context, bool InitContent = true);
static Expected<std::unique_ptr<SymbolicFile>>
createSymbolicFile(MemoryBufferRef Object) {
return createSymbolicFile(Object, llvm::file_magic::unknown, nullptr);
}
static bool classof(const Binary *v) {
return v->isSymbolic();
}
static bool isSymbolicFile(file_magic Type, const LLVMContext *Context);
};
inline BasicSymbolRef::BasicSymbolRef(DataRefImpl SymbolP,
const SymbolicFile *Owner)
: SymbolPimpl(SymbolP), OwningObject(Owner) {}
inline bool BasicSymbolRef::operator==(const BasicSymbolRef &Other) const {
return SymbolPimpl == Other.SymbolPimpl;
}
inline bool BasicSymbolRef::operator<(const BasicSymbolRef &Other) const {
return SymbolPimpl < Other.SymbolPimpl;
}
inline void BasicSymbolRef::moveNext() {
return OwningObject->moveSymbolNext(SymbolPimpl);
}
inline Error BasicSymbolRef::printName(raw_ostream &OS) const {
return OwningObject->printSymbolName(OS, SymbolPimpl);
}
inline Expected<uint32_t> BasicSymbolRef::getFlags() const {
return OwningObject->getSymbolFlags(SymbolPimpl);
}
inline DataRefImpl BasicSymbolRef::getRawDataRefImpl() const {
return SymbolPimpl;
}
inline const SymbolicFile *BasicSymbolRef::getObject() const {
return OwningObject;
}
} // end namespace object
} // end namespace llvm
#endif // LLVM_OBJECT_SYMBOLICFILE_H
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
|
