1//===- llvm-objcopy.cpp ---------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "ObjcopyOptions.h"
10#include "llvm/ADT/STLExtras.h"
11#include "llvm/ADT/SmallVector.h"
12#include "llvm/ADT/StringRef.h"
13#include "llvm/ADT/Twine.h"
14#include "llvm/BinaryFormat/ELF.h"
15#include "llvm/ObjCopy/COFF/COFFConfig.h"
16#include "llvm/ObjCopy/COFF/COFFObjcopy.h"
17#include "llvm/ObjCopy/CommonConfig.h"
18#include "llvm/ObjCopy/ELF/ELFConfig.h"
19#include "llvm/ObjCopy/ELF/ELFObjcopy.h"
20#include "llvm/ObjCopy/MachO/MachOConfig.h"
21#include "llvm/ObjCopy/MachO/MachOObjcopy.h"
22#include "llvm/ObjCopy/ObjCopy.h"
23#include "llvm/ObjCopy/wasm/WasmConfig.h"
24#include "llvm/ObjCopy/wasm/WasmObjcopy.h"
25#include "llvm/Object/Archive.h"
26#include "llvm/Object/ArchiveWriter.h"
27#include "llvm/Object/Binary.h"
28#include "llvm/Object/COFF.h"
29#include "llvm/Object/ELFObjectFile.h"
30#include "llvm/Object/ELFTypes.h"
31#include "llvm/Object/Error.h"
32#include "llvm/Object/MachO.h"
33#include "llvm/Object/MachOUniversal.h"
34#include "llvm/Object/Wasm.h"
35#include "llvm/Option/Arg.h"
36#include "llvm/Option/ArgList.h"
37#include "llvm/Option/Option.h"
38#include "llvm/Support/Casting.h"
39#include "llvm/Support/CommandLine.h"
40#include "llvm/Support/Errc.h"
41#include "llvm/Support/Error.h"
42#include "llvm/Support/ErrorHandling.h"
43#include "llvm/Support/ErrorOr.h"
44#include "llvm/Support/FileUtilities.h"
45#include "llvm/Support/LLVMDriver.h"
46#include "llvm/Support/Memory.h"
47#include "llvm/Support/Path.h"
48#include "llvm/Support/Process.h"
49#include "llvm/Support/SmallVectorMemoryBuffer.h"
50#include "llvm/Support/StringSaver.h"
51#include "llvm/Support/WithColor.h"
52#include "llvm/Support/raw_ostream.h"
53#include "llvm/TargetParser/Host.h"
54#include <algorithm>
55#include <cassert>
56#include <cstdlib>
57#include <memory>
58#include <system_error>
59#include <utility>
60
61using namespace llvm;
62using namespace llvm::objcopy;
63using namespace llvm::object;
64
65// The name this program was invoked as.
66static StringRef ToolName;
67
68static ErrorSuccess reportWarning(Error E) {
69 assert(E);
70 WithColor::warning(OS&: errs(), Prefix: ToolName) << toString(E: std::move(E)) << '\n';
71 return Error::success();
72}
73
74static Expected<DriverConfig> getDriverConfig(ArrayRef<const char *> Args) {
75 StringRef Stem = sys::path::stem(path: ToolName);
76 auto Is = [=](StringRef Tool) {
77 // We need to recognize the following filenames:
78 //
79 // llvm-objcopy -> objcopy
80 // strip-10.exe -> strip
81 // powerpc64-unknown-freebsd13-objcopy -> objcopy
82 // llvm-install-name-tool -> install-name-tool
83 auto I = Stem.rfind_insensitive(Str: Tool);
84 return I != StringRef::npos &&
85 (I + Tool.size() == Stem.size() || !isAlnum(C: Stem[I + Tool.size()]));
86 };
87
88 if (Is("bitcode-strip") || Is("bitcode_strip"))
89 return parseBitcodeStripOptions(ArgsArr: Args, ErrorCallback: reportWarning);
90 else if (Is("strip"))
91 return parseStripOptions(ArgsArr: Args, ErrorCallback: reportWarning);
92 else if (Is("install-name-tool") || Is("install_name_tool"))
93 return parseInstallNameToolOptions(ArgsArr: Args);
94 else
95 return parseObjcopyOptions(ArgsArr: Args, ErrorCallback: reportWarning);
96}
97
98/// The function executeObjcopyOnIHex does the dispatch based on the format
99/// of the output specified by the command line options.
100static Error executeObjcopyOnIHex(ConfigManager &ConfigMgr, MemoryBuffer &In,
101 raw_ostream &Out) {
102 // TODO: support output formats other than ELF.
103 Expected<const ELFConfig &> ELFConfig = ConfigMgr.getELFConfig();
104 if (!ELFConfig)
105 return ELFConfig.takeError();
106
107 return elf::executeObjcopyOnIHex(Config: ConfigMgr.getCommonConfig(), ELFConfig: *ELFConfig, In,
108 Out);
109}
110
111/// The function executeObjcopyOnRawBinary does the dispatch based on the format
112/// of the output specified by the command line options.
113static Error executeObjcopyOnRawBinary(ConfigManager &ConfigMgr,
114 MemoryBuffer &In, raw_ostream &Out) {
115 const CommonConfig &Config = ConfigMgr.getCommonConfig();
116 switch (Config.OutputFormat) {
117 case FileFormat::ELF:
118 // FIXME: Currently, we call elf::executeObjcopyOnRawBinary even if the
119 // output format is binary/ihex or it's not given. This behavior differs from
120 // GNU objcopy. See https://bugs.llvm.org/show_bug.cgi?id=42171 for details.
121 case FileFormat::Binary:
122 case FileFormat::IHex:
123 case FileFormat::Unspecified:
124 case FileFormat::SREC:
125 Expected<const ELFConfig &> ELFConfig = ConfigMgr.getELFConfig();
126 if (!ELFConfig)
127 return ELFConfig.takeError();
128
129 return elf::executeObjcopyOnRawBinary(Config, ELFConfig: *ELFConfig, In, Out);
130 }
131
132 llvm_unreachable("unsupported output format");
133}
134
135/// The function executeObjcopy does the higher level dispatch based on the type
136/// of input (raw binary, archive or single object file) and takes care of the
137/// format-agnostic modifications, i.e. preserving dates.
138static Error executeObjcopy(ConfigManager &ConfigMgr) {
139 CommonConfig &Config = ConfigMgr.Common;
140
141 Expected<FilePermissionsApplier> PermsApplierOrErr =
142 FilePermissionsApplier::create(InputFilename: Config.InputFilename);
143 if (!PermsApplierOrErr)
144 return PermsApplierOrErr.takeError();
145
146 std::function<Error(raw_ostream & OutFile)> ObjcopyFunc;
147
148 OwningBinary<llvm::object::Binary> BinaryHolder;
149 std::unique_ptr<MemoryBuffer> MemoryBufferHolder;
150
151 if (Config.InputFormat == FileFormat::Binary ||
152 Config.InputFormat == FileFormat::IHex) {
153 ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
154 MemoryBuffer::getFileOrSTDIN(Filename: Config.InputFilename);
155 if (!BufOrErr)
156 return createFileError(F: Config.InputFilename, EC: BufOrErr.getError());
157 MemoryBufferHolder = std::move(*BufOrErr);
158
159 if (Config.InputFormat == FileFormat::Binary)
160 ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
161 // Handle FileFormat::Binary.
162 return executeObjcopyOnRawBinary(ConfigMgr, In&: *MemoryBufferHolder,
163 Out&: OutFile);
164 };
165 else
166 ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
167 // Handle FileFormat::IHex.
168 return executeObjcopyOnIHex(ConfigMgr, In&: *MemoryBufferHolder, Out&: OutFile);
169 };
170 } else {
171 Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
172 createBinary(Path: Config.InputFilename);
173 if (!BinaryOrErr)
174 return createFileError(F: Config.InputFilename, E: BinaryOrErr.takeError());
175 BinaryHolder = std::move(*BinaryOrErr);
176
177 if (Archive *Ar = dyn_cast<Archive>(Val: BinaryHolder.getBinary())) {
178 // Handle Archive.
179 if (Error E = executeObjcopyOnArchive(Config: ConfigMgr, Ar: *Ar))
180 return E;
181 } else {
182 // Handle llvm::object::Binary.
183 ObjcopyFunc = [&](raw_ostream &OutFile) -> Error {
184 return executeObjcopyOnBinary(Config: ConfigMgr, In&: *BinaryHolder.getBinary(),
185 Out&: OutFile);
186 };
187 }
188 }
189
190 if (ObjcopyFunc) {
191 if (Config.SplitDWO.empty()) {
192 // Apply transformations described by Config and store result into
193 // Config.OutputFilename using specified ObjcopyFunc function.
194 if (Error E = writeToOutput(OutputFileName: Config.OutputFilename, Write: ObjcopyFunc))
195 return E;
196 } else {
197 Config.ExtractDWO = true;
198 Config.StripDWO = false;
199 // Copy .dwo tables from the Config.InputFilename into Config.SplitDWO
200 // file using specified ObjcopyFunc function.
201 if (Error E = writeToOutput(OutputFileName: Config.SplitDWO, Write: ObjcopyFunc))
202 return E;
203 Config.ExtractDWO = false;
204 Config.StripDWO = true;
205 // Apply transformations described by Config, remove .dwo tables and
206 // store result into Config.OutputFilename using specified ObjcopyFunc
207 // function.
208 if (Error E = writeToOutput(OutputFileName: Config.OutputFilename, Write: ObjcopyFunc))
209 return E;
210 }
211 }
212
213 if (Error E =
214 PermsApplierOrErr->apply(OutputFilename: Config.OutputFilename, CopyDates: Config.PreserveDates))
215 return E;
216
217 if (!Config.SplitDWO.empty())
218 if (Error E =
219 PermsApplierOrErr->apply(OutputFilename: Config.SplitDWO, CopyDates: Config.PreserveDates,
220 OverwritePermissions: static_cast<sys::fs::perms>(0666)))
221 return E;
222
223 return Error::success();
224}
225
226int llvm_objcopy_main(int argc, char **argv, const llvm::ToolContext &) {
227 ToolName = argv[0];
228
229 // Expand response files.
230 // TODO: Move these lines, which are copied from lib/Support/CommandLine.cpp,
231 // into a separate function in the CommandLine library and call that function
232 // here. This is duplicated code.
233 SmallVector<const char *, 20> NewArgv(argv, argv + argc);
234 BumpPtrAllocator A;
235 StringSaver Saver(A);
236 cl::ExpandResponseFiles(Saver,
237 Tokenizer: Triple(sys::getProcessTriple()).isOSWindows()
238 ? cl::TokenizeWindowsCommandLine
239 : cl::TokenizeGNUCommandLine,
240 Argv&: NewArgv);
241
242 auto Args = ArrayRef(NewArgv).drop_front();
243 Expected<DriverConfig> DriverConfig = getDriverConfig(Args);
244
245 if (!DriverConfig) {
246 logAllUnhandledErrors(E: DriverConfig.takeError(),
247 OS&: WithColor::error(OS&: errs(), Prefix: ToolName));
248 return 1;
249 }
250 for (ConfigManager &ConfigMgr : DriverConfig->CopyConfigs) {
251 if (Error E = executeObjcopy(ConfigMgr)) {
252 logAllUnhandledErrors(E: std::move(E), OS&: WithColor::error(OS&: errs(), Prefix: ToolName));
253 return 1;
254 }
255 }
256
257 return 0;
258}
259

source code of llvm/tools/llvm-objcopy/llvm-objcopy.cpp