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
|
//===- llvm-vtabledump.cpp - Dump vtables in an Object File -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Dumps VTables resident in object files and archives. Note, it currently only
// supports MS-ABI style object files.
//
//===----------------------------------------------------------------------===//
#include "llvm-vtabledump.h"
#include "Error.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include <map>
#include <string>
#include <system_error>
using namespace llvm;
using namespace llvm::object;
using namespace llvm::support;
namespace opts {
cl::list<std::string> InputFilenames(cl::Positional,
cl::desc("<input object files>"),
cl::ZeroOrMore);
} // namespace opts
static int ReturnValue = EXIT_SUCCESS;
namespace llvm {
bool error(std::error_code EC) {
if (!EC)
return false;
ReturnValue = EXIT_FAILURE;
outs() << "\nError reading file: " << EC.message() << ".\n";
outs().flush();
return true;
}
} // namespace llvm
static void reportError(StringRef Input, StringRef Message) {
if (Input == "-")
Input = "<stdin>";
errs() << Input << ": " << Message << "\n";
errs().flush();
ReturnValue = EXIT_FAILURE;
}
static void reportError(StringRef Input, std::error_code EC) {
reportError(Input, EC.message());
}
static void dumpVTables(const ObjectFile *Obj) {
std::map<std::pair<StringRef, uint64_t>, StringRef> VFTableEntries;
StringMap<ArrayRef<aligned_little32_t>> VBTables;
for (const object::SymbolRef &Sym : Obj->symbols()) {
StringRef SymName;
if (error(Sym.getName(SymName)))
return;
// VFTables in the MS-ABI start with '??_7' and are contained within their
// own COMDAT section. We then determine the contents of the VFTable by
// looking at each relocation in the section.
if (SymName.startswith("??_7")) {
object::section_iterator SecI(Obj->section_begin());
if (error(Sym.getSection(SecI)))
return;
if (SecI == Obj->section_end())
continue;
// Each relocation either names a virtual method or a thunk. We note the
// offset into the section and the symbol used for the relocation.
for (const object::RelocationRef &Reloc : SecI->relocations()) {
const object::symbol_iterator RelocSymI = Reloc.getSymbol();
if (RelocSymI == Obj->symbol_end())
continue;
StringRef RelocSymName;
if (error(RelocSymI->getName(RelocSymName)))
return;
uint64_t Offset;
if (error(Reloc.getOffset(Offset)))
return;
VFTableEntries[std::make_pair(SymName, Offset)] = RelocSymName;
}
}
// VBTables in the MS-ABI start with '??_8' and are filled with 32-bit
// offsets of virtual bases.
else if (SymName.startswith("??_8")) {
object::section_iterator SecI(Obj->section_begin());
if (error(Sym.getSection(SecI)))
return;
if (SecI == Obj->section_end())
continue;
StringRef SecContents;
if (error(SecI->getContents(SecContents)))
return;
ArrayRef<aligned_little32_t> VBTableData(
reinterpret_cast<const aligned_little32_t *>(SecContents.data()),
SecContents.size() / sizeof(aligned_little32_t));
VBTables[SymName] = VBTableData;
}
}
for (
const std::pair<std::pair<StringRef, uint64_t>, StringRef> &VFTableEntry :
VFTableEntries) {
StringRef VFTableName = VFTableEntry.first.first;
uint64_t Offset = VFTableEntry.first.second;
StringRef SymName = VFTableEntry.second;
outs() << VFTableName << '[' << Offset << "]: " << SymName << '\n';
}
for (const StringMapEntry<ArrayRef<aligned_little32_t>> &VBTable : VBTables) {
StringRef VBTableName = VBTable.getKey();
uint32_t Idx = 0;
for (aligned_little32_t Offset : VBTable.getValue()) {
outs() << VBTableName << '[' << Idx << "]: " << Offset << '\n';
Idx += sizeof(aligned_little32_t);
}
}
}
static void dumpArchive(const Archive *Arc) {
for (Archive::child_iterator ArcI = Arc->child_begin(),
ArcE = Arc->child_end();
ArcI != ArcE; ++ArcI) {
ErrorOr<std::unique_ptr<Binary>> ChildOrErr = ArcI->getAsBinary();
if (std::error_code EC = ChildOrErr.getError()) {
// Ignore non-object files.
if (EC != object_error::invalid_file_type)
reportError(Arc->getFileName(), EC.message());
continue;
}
if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
dumpVTables(Obj);
else
reportError(Arc->getFileName(),
vtabledump_error::unrecognized_file_format);
}
}
static void dumpInput(StringRef File) {
// If file isn't stdin, check that it exists.
if (File != "-" && !sys::fs::exists(File)) {
reportError(File, vtabledump_error::file_not_found);
return;
}
// Attempt to open the binary.
ErrorOr<Binary *> BinaryOrErr = createBinary(File);
if (std::error_code EC = BinaryOrErr.getError()) {
reportError(File, EC);
return;
}
std::unique_ptr<Binary> Binary(BinaryOrErr.get());
if (Archive *Arc = dyn_cast<Archive>(Binary.get()))
dumpArchive(Arc);
else if (ObjectFile *Obj = dyn_cast<ObjectFile>(Binary.get()))
dumpVTables(Obj);
else
reportError(File, vtabledump_error::unrecognized_file_format);
}
int main(int argc, const char *argv[]) {
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y;
// Initialize targets.
llvm::InitializeAllTargetInfos();
// Register the target printer for --version.
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
cl::ParseCommandLineOptions(argc, argv, "LLVM VTable Dumper\n");
// Default to stdin if no filename is specified.
if (opts::InputFilenames.size() == 0)
opts::InputFilenames.push_back("-");
std::for_each(opts::InputFilenames.begin(), opts::InputFilenames.end(),
dumpInput);
return ReturnValue;
}
|
