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
|
//===- InputFiles.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 LLD_WASM_INPUT_FILES_H
#define LLD_WASM_INPUT_FILES_H
#include "Symbols.h"
#include "lld/Common/LLVM.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/Triple.h"
#include "llvm/LTO/LTO.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/Wasm.h"
#include "llvm/Support/MemoryBuffer.h"
#include <vector>
namespace llvm {
class TarWriter;
}
namespace lld {
namespace wasm {
class InputChunk;
class InputFunction;
class InputSegment;
class InputGlobal;
class InputEvent;
class InputSection;
// If --reproduce option is given, all input files are written
// to this tar archive.
extern std::unique_ptr<llvm::TarWriter> tar;
class InputFile {
public:
enum Kind {
ObjectKind,
SharedKind,
ArchiveKind,
BitcodeKind,
};
virtual ~InputFile() {}
// Returns the filename.
StringRef getName() const { return mb.getBufferIdentifier(); }
Kind kind() const { return fileKind; }
// An archive file name if this file is created from an archive.
std::string archiveName;
ArrayRef<Symbol *> getSymbols() const { return symbols; }
MutableArrayRef<Symbol *> getMutableSymbols() { return symbols; }
// An InputFile is considered live if any of the symbols defined by it
// are live.
void markLive() { live = true; }
bool isLive() const { return live; }
protected:
InputFile(Kind k, MemoryBufferRef m)
: mb(m), fileKind(k), live(!config->gcSections) {}
void checkArch(llvm::Triple::ArchType arch) const;
MemoryBufferRef mb;
// List of all symbols referenced or defined by this file.
std::vector<Symbol *> symbols;
private:
const Kind fileKind;
bool live;
};
// .a file (ar archive)
class ArchiveFile : public InputFile {
public:
explicit ArchiveFile(MemoryBufferRef m) : InputFile(ArchiveKind, m) {}
static bool classof(const InputFile *f) { return f->kind() == ArchiveKind; }
void addMember(const llvm::object::Archive::Symbol *sym);
void parse();
private:
std::unique_ptr<llvm::object::Archive> file;
llvm::DenseSet<uint64_t> seen;
};
// .o file (wasm object file)
class ObjFile : public InputFile {
public:
explicit ObjFile(MemoryBufferRef m, StringRef archiveName)
: InputFile(ObjectKind, m) {
this->archiveName = std::string(archiveName);
// If this isn't part of an archive, it's eagerly linked, so mark it live.
if (archiveName.empty())
markLive();
}
static bool classof(const InputFile *f) { return f->kind() == ObjectKind; }
void parse(bool ignoreComdats = false);
// Returns the underlying wasm file.
const WasmObjectFile *getWasmObj() const { return wasmObj.get(); }
void dumpInfo() const;
uint32_t calcNewIndex(const WasmRelocation &reloc) const;
uint64_t calcNewValue(const WasmRelocation &reloc, uint64_t tombstone) const;
uint64_t calcNewAddend(const WasmRelocation &reloc) const;
uint64_t calcExpectedValue(const WasmRelocation &reloc) const;
Symbol *getSymbol(const WasmRelocation &reloc) const {
return symbols[reloc.Index];
};
const WasmSection *codeSection = nullptr;
const WasmSection *dataSection = nullptr;
// Maps input type indices to output type indices
std::vector<uint32_t> typeMap;
std::vector<bool> typeIsUsed;
// Maps function indices to table indices
std::vector<uint32_t> tableEntries;
std::vector<uint32_t> tableEntriesRel;
std::vector<bool> keptComdats;
std::vector<InputSegment *> segments;
std::vector<InputFunction *> functions;
std::vector<InputGlobal *> globals;
std::vector<InputEvent *> events;
std::vector<InputSection *> customSections;
llvm::DenseMap<uint32_t, InputSection *> customSectionsByIndex;
Symbol *getSymbol(uint32_t index) const { return symbols[index]; }
FunctionSymbol *getFunctionSymbol(uint32_t index) const;
DataSymbol *getDataSymbol(uint32_t index) const;
GlobalSymbol *getGlobalSymbol(uint32_t index) const;
SectionSymbol *getSectionSymbol(uint32_t index) const;
EventSymbol *getEventSymbol(uint32_t index) const;
private:
Symbol *createDefined(const WasmSymbol &sym);
Symbol *createUndefined(const WasmSymbol &sym, bool isCalledDirectly);
bool isExcludedByComdat(InputChunk *chunk) const;
std::unique_ptr<WasmObjectFile> wasmObj;
};
// .so file.
class SharedFile : public InputFile {
public:
explicit SharedFile(MemoryBufferRef m) : InputFile(SharedKind, m) {}
static bool classof(const InputFile *f) { return f->kind() == SharedKind; }
};
// .bc file
class BitcodeFile : public InputFile {
public:
explicit BitcodeFile(MemoryBufferRef m, StringRef archiveName)
: InputFile(BitcodeKind, m) {
this->archiveName = std::string(archiveName);
// If this isn't part of an archive, it's eagerly linked, so mark it live.
if (archiveName.empty())
markLive();
}
static bool classof(const InputFile *f) { return f->kind() == BitcodeKind; }
void parse();
std::unique_ptr<llvm::lto::InputFile> obj;
// Set to true once LTO is complete in order prevent further bitcode objects
// being added.
static bool doneLTO;
};
inline bool isBitcode(MemoryBufferRef mb) {
return identify_magic(mb.getBuffer()) == llvm::file_magic::bitcode;
}
// Will report a fatal() error if the input buffer is not a valid bitcode
// or wasm object file.
InputFile *createObjectFile(MemoryBufferRef mb, StringRef archiveName = "");
// Opens a given file.
llvm::Optional<MemoryBufferRef> readFile(StringRef path);
} // namespace wasm
std::string toString(const wasm::InputFile *file);
} // namespace lld
#endif
|
