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
|
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Options.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/TargetSelect.h"
#include <memory>
#include <list>
#include <unordered_set>
using namespace llvm;
using namespace llvm::object;
using namespace cl;
OptionCategory DwpCategory("Specific Options");
static list<std::string> InputFiles(Positional, OneOrMore,
desc("<input files>"), cat(DwpCategory));
static opt<std::string> OutputFilename(Required, "o", desc("Specify the output file."),
value_desc("filename"), cat(DwpCategory));
static int error(const Twine &Error, const Twine &Context) {
errs() << Twine("while processing ") + Context + ":\n";
errs() << Twine("error: ") + Error + "\n";
return 1;
}
static std::error_code
writeStringsAndOffsets(MCStreamer &Out, StringMap<uint32_t> &Strings,
uint32_t &StringOffset, MCSection *StrOffsetSection,
StringRef CurStrSection, StringRef CurStrOffsetSection) {
// Could possibly produce an error or warning if one of these was non-null but
// the other was null.
if (CurStrSection.empty() || CurStrOffsetSection.empty())
return std::error_code();
DenseMap<uint32_t, uint32_t> OffsetRemapping;
DataExtractor Data(CurStrSection, true, 0);
uint32_t LocalOffset = 0;
uint32_t PrevOffset = 0;
while (const char *s = Data.getCStr(&LocalOffset)) {
StringRef Str(s, LocalOffset - PrevOffset - 1);
OffsetRemapping[PrevOffset] = StringOffset;
// insert, if successful, write new string to the str.dwo section
StringOffset += Str.size() + 1;
PrevOffset = LocalOffset;
}
Data = DataExtractor(CurStrOffsetSection, true, 0);
Out.SwitchSection(StrOffsetSection);
uint32_t Offset = 0;
uint64_t Size = CurStrOffsetSection.size();
while (Offset < Size) {
auto OldOffset = Data.getU32(&Offset);
auto NewOffset = OffsetRemapping[OldOffset];
Out.EmitIntValue(NewOffset, 4);
}
return std::error_code();
}
static std::error_code write(MCStreamer &Out, ArrayRef<std::string> Inputs) {
const auto &MCOFI = *Out.getContext().getObjectFileInfo();
MCSection *const StrSection = MCOFI.getDwarfStrDWOSection();
MCSection *const StrOffsetSection = MCOFI.getDwarfStrOffDWOSection();
const StringMap<MCSection *> KnownSections = {
{"debug_info.dwo", MCOFI.getDwarfInfoDWOSection()},
{"debug_types.dwo", MCOFI.getDwarfTypesDWOSection()},
{"debug_str_offsets.dwo", StrOffsetSection},
{"debug_str.dwo", StrSection},
{"debug_loc.dwo", MCOFI.getDwarfLocDWOSection()},
{"debug_abbrev.dwo", MCOFI.getDwarfAbbrevDWOSection()}};
StringMap<uint32_t> Strings;
uint32_t StringOffset = 0;
for (const auto &Input : Inputs) {
auto ErrOrObj = object::ObjectFile::createObjectFile(Input);
if (!ErrOrObj)
return ErrOrObj.getError();
const auto *Obj = ErrOrObj->getBinary();
StringRef CurStrSection;
StringRef CurStrOffsetSection;
for (const auto &Section : Obj->sections()) {
StringRef Name;
if (std::error_code Err = Section.getName(Name))
return Err;
if (MCSection *OutSection =
KnownSections.lookup(Name.substr(Name.find_first_not_of("._")))) {
StringRef Contents;
if (auto Err = Section.getContents(Contents))
return Err;
if (OutSection == StrOffsetSection) {
CurStrOffsetSection = Contents;
continue;
}
if (OutSection == StrSection)
CurStrSection = Contents;
Out.SwitchSection(OutSection);
Out.EmitBytes(Contents);
}
}
if (auto Err =
writeStringsAndOffsets(Out, Strings, StringOffset, StrOffsetSection,
CurStrSection, CurStrOffsetSection))
return Err;
}
return std::error_code();
}
int main(int argc, char** argv) {
ParseCommandLineOptions(argc, argv, "merge split dwarf (.dwo) files");
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
std::string ErrorStr;
StringRef Context = "dwarf streamer init";
Triple TheTriple("x86_64-linux-gnu");
// Get the target.
const Target *TheTarget =
TargetRegistry::lookupTarget("", TheTriple, ErrorStr);
if (!TheTarget)
return error(ErrorStr, Context);
std::string TripleName = TheTriple.getTriple();
// Create all the MC Objects.
std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
if (!MRI)
return error(Twine("no register info for target ") + TripleName, Context);
std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
if (!MAI)
return error("no asm info for target " + TripleName, Context);
MCObjectFileInfo MOFI;
MCContext MC(MAI.get(), MRI.get(), &MOFI);
MOFI.InitMCObjectFileInfo(TheTriple, Reloc::Default, CodeModel::Default,
MC);
auto MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, "");
if (!MAB)
return error("no asm backend for target " + TripleName, Context);
std::unique_ptr<MCInstrInfo> MII(TheTarget->createMCInstrInfo());
if (!MII)
return error("no instr info info for target " + TripleName, Context);
std::unique_ptr<MCSubtargetInfo> MSTI(
TheTarget->createMCSubtargetInfo(TripleName, "", ""));
if (!MSTI)
return error("no subtarget info for target " + TripleName, Context);
MCCodeEmitter *MCE = TheTarget->createMCCodeEmitter(*MII, *MRI, MC);
if (!MCE)
return error("no code emitter for target " + TripleName, Context);
// Create the output file.
std::error_code EC;
raw_fd_ostream OutFile(OutputFilename, EC, sys::fs::F_None);
if (EC)
return error(Twine(OutputFilename) + ": " + EC.message(), Context);
std::unique_ptr<MCStreamer> MS(TheTarget->createMCObjectStreamer(
TheTriple, MC, *MAB, OutFile, MCE, *MSTI, false,
/*DWARFMustBeAtTheEnd*/ false));
if (!MS)
return error("no object streamer for target " + TripleName, Context);
if (auto Err = write(*MS, InputFiles))
return error(Err.message(), "Writing DWP file");
MS->Finish();
}
|
