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
|
//===-- llvm-dwp.cpp - Split DWARF merging tool for llvm ------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// A utility for merging DWARF 5 Split DWARF .dwo files into .dwp (DWARF
// package files).
//
//===----------------------------------------------------------------------===//
#include "llvm/DWP/DWP.h"
#include "llvm/DWP/DWPError.h"
#include "llvm/DWP/DWPStringPool.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCTargetOptionsCommandFlags.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
using namespace llvm;
using namespace llvm::object;
static mc::RegisterMCTargetOptionsFlags MCTargetOptionsFlags;
cl::OptionCategory DwpCategory("Specific Options");
static cl::list<std::string> InputFiles(cl::Positional, cl::ZeroOrMore,
cl::desc("<input files>"),
cl::cat(DwpCategory));
static cl::list<std::string> ExecFilenames(
"e", cl::ZeroOrMore,
cl::desc("Specify the executable/library files to get the list of *.dwo from"),
cl::value_desc("filename"), cl::cat(DwpCategory));
static cl::opt<std::string> OutputFilename(cl::Required, "o",
cl::desc("Specify the output file."),
cl::value_desc("filename"),
cl::cat(DwpCategory));
static Expected<SmallVector<std::string, 16>>
getDWOFilenames(StringRef ExecFilename) {
auto ErrOrObj = object::ObjectFile::createObjectFile(ExecFilename);
if (!ErrOrObj)
return ErrOrObj.takeError();
const ObjectFile &Obj = *ErrOrObj.get().getBinary();
std::unique_ptr<DWARFContext> DWARFCtx = DWARFContext::create(Obj);
SmallVector<std::string, 16> DWOPaths;
for (const auto &CU : DWARFCtx->compile_units()) {
const DWARFDie &Die = CU->getUnitDIE();
std::string DWOName = dwarf::toString(
Die.find({dwarf::DW_AT_dwo_name, dwarf::DW_AT_GNU_dwo_name}), "");
if (DWOName.empty())
continue;
std::string DWOCompDir =
dwarf::toString(Die.find(dwarf::DW_AT_comp_dir), "");
if (!DWOCompDir.empty()) {
SmallString<16> DWOPath(std::move(DWOName));
sys::fs::make_absolute(DWOCompDir, DWOPath);
DWOPaths.emplace_back(DWOPath.data(), DWOPath.size());
} else {
DWOPaths.push_back(std::move(DWOName));
}
}
return std::move(DWOPaths);
}
static int error(const Twine &Error, const Twine &Context) {
errs() << Twine("while processing ") + Context + ":\n";
errs() << Twine("error: ") + Error + "\n";
return 1;
}
static Expected<Triple> readTargetTriple(StringRef FileName) {
auto ErrOrObj = object::ObjectFile::createObjectFile(FileName);
if (!ErrOrObj)
return ErrOrObj.takeError();
return ErrOrObj->getBinary()->makeTriple();
}
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
cl::HideUnrelatedOptions({&DwpCategory, &getColorCategory()});
cl::ParseCommandLineOptions(argc, argv, "merge split dwarf (.dwo) files\n");
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllTargets();
llvm::InitializeAllAsmPrinters();
std::vector<std::string> DWOFilenames = InputFiles;
for (const auto &ExecFilename : ExecFilenames) {
auto DWOs = getDWOFilenames(ExecFilename);
if (!DWOs) {
logAllUnhandledErrors(DWOs.takeError(), WithColor::error());
return 1;
}
DWOFilenames.insert(DWOFilenames.end(),
std::make_move_iterator(DWOs->begin()),
std::make_move_iterator(DWOs->end()));
}
if (DWOFilenames.empty())
return 0;
std::string ErrorStr;
StringRef Context = "dwarf streamer init";
auto ErrOrTriple = readTargetTriple(DWOFilenames.front());
if (!ErrOrTriple) {
logAllUnhandledErrors(ErrOrTriple.takeError(), WithColor::error());
return 1;
}
// Get the target.
const Target *TheTarget =
TargetRegistry::lookupTarget("", *ErrOrTriple, ErrorStr);
if (!TheTarget)
return error(ErrorStr, Context);
std::string TripleName = ErrOrTriple->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);
MCTargetOptions MCOptions = llvm::mc::InitMCTargetOptionsFromFlags();
std::unique_ptr<MCAsmInfo> MAI(
TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
if (!MAI)
return error("no asm info for target " + TripleName, Context);
std::unique_ptr<MCSubtargetInfo> MSTI(
TheTarget->createMCSubtargetInfo(TripleName, "", ""));
if (!MSTI)
return error("no subtarget info for target " + TripleName, Context);
MCContext MC(*ErrOrTriple, MAI.get(), MRI.get(), MSTI.get());
std::unique_ptr<MCObjectFileInfo> MOFI(
TheTarget->createMCObjectFileInfo(MC, /*PIC=*/false));
MC.setObjectFileInfo(MOFI.get());
MCTargetOptions Options;
auto MAB = TheTarget->createMCAsmBackend(*MSTI, *MRI, Options);
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);
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;
ToolOutputFile OutFile(OutputFilename, EC, sys::fs::OF_None);
Optional<buffer_ostream> BOS;
raw_pwrite_stream *OS;
if (EC)
return error(Twine(OutputFilename) + ": " + EC.message(), Context);
if (OutFile.os().supportsSeeking()) {
OS = &OutFile.os();
} else {
BOS.emplace(OutFile.os());
OS = BOS.getPointer();
}
std::unique_ptr<MCStreamer> MS(TheTarget->createMCObjectStreamer(
*ErrOrTriple, MC, std::unique_ptr<MCAsmBackend>(MAB),
MAB->createObjectWriter(*OS), std::unique_ptr<MCCodeEmitter>(MCE), *MSTI,
MCOptions.MCRelaxAll, MCOptions.MCIncrementalLinkerCompatible,
/*DWARFMustBeAtTheEnd*/ false));
if (!MS)
return error("no object streamer for target " + TripleName, Context);
if (auto Err = write(*MS, DWOFilenames)) {
logAllUnhandledErrors(std::move(Err), WithColor::error());
return 1;
}
MS->Finish();
OutFile.keep();
return 0;
}
|
