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1 | //===- Driver.cpp ---------------------------------------------------------===// | |||
2 | // | |||
3 | // The LLVM Linker | |||
4 | // | |||
5 | // This file is distributed under the University of Illinois Open Source | |||
6 | // License. See LICENSE.TXT for details. | |||
7 | // | |||
8 | //===----------------------------------------------------------------------===// | |||
9 | // | |||
10 | // The driver drives the entire linking process. It is responsible for | |||
11 | // parsing command line options and doing whatever it is instructed to do. | |||
12 | // | |||
13 | // One notable thing in the LLD's driver when compared to other linkers is | |||
14 | // that the LLD's driver is agnostic on the host operating system. | |||
15 | // Other linkers usually have implicit default values (such as a dynamic | |||
16 | // linker path or library paths) for each host OS. | |||
17 | // | |||
18 | // I don't think implicit default values are useful because they are | |||
19 | // usually explicitly specified by the compiler driver. They can even | |||
20 | // be harmful when you are doing cross-linking. Therefore, in LLD, we | |||
21 | // simply trust the compiler driver to pass all required options and | |||
22 | // don't try to make effort on our side. | |||
23 | // | |||
24 | //===----------------------------------------------------------------------===// | |||
25 | ||||
26 | #include "Driver.h" | |||
27 | #include "Config.h" | |||
28 | #include "Filesystem.h" | |||
29 | #include "ICF.h" | |||
30 | #include "InputFiles.h" | |||
31 | #include "InputSection.h" | |||
32 | #include "LinkerScript.h" | |||
33 | #include "MarkLive.h" | |||
34 | #include "OutputSections.h" | |||
35 | #include "ScriptParser.h" | |||
36 | #include "SymbolTable.h" | |||
37 | #include "Symbols.h" | |||
38 | #include "SyntheticSections.h" | |||
39 | #include "Target.h" | |||
40 | #include "Writer.h" | |||
41 | #include "lld/Common/Args.h" | |||
42 | #include "lld/Common/Driver.h" | |||
43 | #include "lld/Common/ErrorHandler.h" | |||
44 | #include "lld/Common/Memory.h" | |||
45 | #include "lld/Common/Strings.h" | |||
46 | #include "lld/Common/TargetOptionsCommandFlags.h" | |||
47 | #include "lld/Common/Threads.h" | |||
48 | #include "lld/Common/Version.h" | |||
49 | #include "llvm/ADT/SetVector.h" | |||
50 | #include "llvm/ADT/StringExtras.h" | |||
51 | #include "llvm/ADT/StringSwitch.h" | |||
52 | #include "llvm/Support/CommandLine.h" | |||
53 | #include "llvm/Support/Compression.h" | |||
54 | #include "llvm/Support/LEB128.h" | |||
55 | #include "llvm/Support/Path.h" | |||
56 | #include "llvm/Support/TarWriter.h" | |||
57 | #include "llvm/Support/TargetSelect.h" | |||
58 | #include "llvm/Support/raw_ostream.h" | |||
59 | #include <cstdlib> | |||
60 | #include <utility> | |||
61 | ||||
62 | using namespace llvm; | |||
63 | using namespace llvm::ELF; | |||
64 | using namespace llvm::object; | |||
65 | using namespace llvm::sys; | |||
66 | using namespace llvm::support; | |||
67 | ||||
68 | using namespace lld; | |||
69 | using namespace lld::elf; | |||
70 | ||||
71 | Configuration *elf::Config; | |||
72 | LinkerDriver *elf::Driver; | |||
73 | ||||
74 | static void setConfigs(opt::InputArgList &Args); | |||
75 | ||||
76 | bool elf::link(ArrayRef<const char *> Args, bool CanExitEarly, | |||
77 | raw_ostream &Error) { | |||
78 | errorHandler().LogName = args::getFilenameWithoutExe(Args[0]); | |||
79 | errorHandler().ErrorLimitExceededMsg = | |||
80 | "too many errors emitted, stopping now (use " | |||
81 | "-error-limit=0 to see all errors)"; | |||
82 | errorHandler().ErrorOS = &Error; | |||
83 | errorHandler().ExitEarly = CanExitEarly; | |||
84 | errorHandler().ColorDiagnostics = Error.has_colors(); | |||
85 | ||||
86 | InputSections.clear(); | |||
87 | OutputSections.clear(); | |||
88 | BinaryFiles.clear(); | |||
89 | BitcodeFiles.clear(); | |||
90 | ObjectFiles.clear(); | |||
91 | SharedFiles.clear(); | |||
92 | ||||
93 | Config = make<Configuration>(); | |||
94 | Driver = make<LinkerDriver>(); | |||
95 | Script = make<LinkerScript>(); | |||
96 | Symtab = make<SymbolTable>(); | |||
97 | ||||
98 | Tar = nullptr; | |||
99 | memset(&In, 0, sizeof(In)); | |||
100 | ||||
101 | Config->ProgName = Args[0]; | |||
102 | ||||
103 | Driver->main(Args); | |||
| ||||
104 | ||||
105 | // Exit immediately if we don't need to return to the caller. | |||
106 | // This saves time because the overhead of calling destructors | |||
107 | // for all globally-allocated objects is not negligible. | |||
108 | if (CanExitEarly) | |||
109 | exitLld(errorCount() ? 1 : 0); | |||
110 | ||||
111 | freeArena(); | |||
112 | return !errorCount(); | |||
113 | } | |||
114 | ||||
115 | // Parses a linker -m option. | |||
116 | static std::tuple<ELFKind, uint16_t, uint8_t> parseEmulation(StringRef Emul) { | |||
117 | uint8_t OSABI = 0; | |||
118 | StringRef S = Emul; | |||
119 | if (S.endswith("_fbsd")) { | |||
120 | S = S.drop_back(5); | |||
121 | OSABI = ELFOSABI_FREEBSD; | |||
122 | } | |||
123 | ||||
124 | std::pair<ELFKind, uint16_t> Ret = | |||
125 | StringSwitch<std::pair<ELFKind, uint16_t>>(S) | |||
126 | .Cases("aarch64elf", "aarch64linux", "aarch64_elf64_le_vec", | |||
127 | {ELF64LEKind, EM_AARCH64}) | |||
128 | .Cases("armelf", "armelf_linux_eabi", {ELF32LEKind, EM_ARM}) | |||
129 | .Case("elf32_x86_64", {ELF32LEKind, EM_X86_64}) | |||
130 | .Cases("elf32btsmip", "elf32btsmipn32", {ELF32BEKind, EM_MIPS}) | |||
131 | .Cases("elf32ltsmip", "elf32ltsmipn32", {ELF32LEKind, EM_MIPS}) | |||
132 | .Case("elf32lriscv", {ELF32LEKind, EM_RISCV}) | |||
133 | .Case("elf32ppc", {ELF32BEKind, EM_PPC}) | |||
134 | .Case("elf64btsmip", {ELF64BEKind, EM_MIPS}) | |||
135 | .Case("elf64ltsmip", {ELF64LEKind, EM_MIPS}) | |||
136 | .Case("elf64lriscv", {ELF64LEKind, EM_RISCV}) | |||
137 | .Case("elf64ppc", {ELF64BEKind, EM_PPC64}) | |||
138 | .Case("elf64lppc", {ELF64LEKind, EM_PPC64}) | |||
139 | .Cases("elf_amd64", "elf_x86_64", {ELF64LEKind, EM_X86_64}) | |||
140 | .Case("elf_i386", {ELF32LEKind, EM_386}) | |||
141 | .Case("elf_iamcu", {ELF32LEKind, EM_IAMCU}) | |||
142 | .Default({ELFNoneKind, EM_NONE}); | |||
143 | ||||
144 | if (Ret.first == ELFNoneKind) | |||
145 | error("unknown emulation: " + Emul); | |||
146 | return std::make_tuple(Ret.first, Ret.second, OSABI); | |||
147 | } | |||
148 | ||||
149 | // Returns slices of MB by parsing MB as an archive file. | |||
150 | // Each slice consists of a member file in the archive. | |||
151 | std::vector<std::pair<MemoryBufferRef, uint64_t>> static getArchiveMembers( | |||
152 | MemoryBufferRef MB) { | |||
153 | std::unique_ptr<Archive> File = | |||
154 | CHECK(Archive::create(MB),check2((Archive::create(MB)), [&] { return toString(MB.getBufferIdentifier () + ": failed to parse archive"); }) | |||
155 | MB.getBufferIdentifier() + ": failed to parse archive")check2((Archive::create(MB)), [&] { return toString(MB.getBufferIdentifier () + ": failed to parse archive"); }); | |||
156 | ||||
157 | std::vector<std::pair<MemoryBufferRef, uint64_t>> V; | |||
158 | Error Err = Error::success(); | |||
159 | bool AddToTar = File->isThin() && Tar; | |||
160 | for (const ErrorOr<Archive::Child> &COrErr : File->children(Err)) { | |||
161 | Archive::Child C = | |||
162 | CHECK(COrErr, MB.getBufferIdentifier() +check2((COrErr), [&] { return toString(MB.getBufferIdentifier () + ": could not get the child of the archive"); }) | |||
163 | ": could not get the child of the archive")check2((COrErr), [&] { return toString(MB.getBufferIdentifier () + ": could not get the child of the archive"); }); | |||
164 | MemoryBufferRef MBRef = | |||
165 | CHECK(C.getMemoryBufferRef(),check2((C.getMemoryBufferRef()), [&] { return toString(MB .getBufferIdentifier() + ": could not get the buffer for a child of the archive" ); }) | |||
166 | MB.getBufferIdentifier() +check2((C.getMemoryBufferRef()), [&] { return toString(MB .getBufferIdentifier() + ": could not get the buffer for a child of the archive" ); }) | |||
167 | ": could not get the buffer for a child of the archive")check2((C.getMemoryBufferRef()), [&] { return toString(MB .getBufferIdentifier() + ": could not get the buffer for a child of the archive" ); }); | |||
168 | if (AddToTar) | |||
169 | Tar->append(relativeToRoot(check(C.getFullName())), MBRef.getBuffer()); | |||
170 | V.push_back(std::make_pair(MBRef, C.getChildOffset())); | |||
171 | } | |||
172 | if (Err) | |||
173 | fatal(MB.getBufferIdentifier() + ": Archive::children failed: " + | |||
174 | toString(std::move(Err))); | |||
175 | ||||
176 | // Take ownership of memory buffers created for members of thin archives. | |||
177 | for (std::unique_ptr<MemoryBuffer> &MB : File->takeThinBuffers()) | |||
178 | make<std::unique_ptr<MemoryBuffer>>(std::move(MB)); | |||
179 | ||||
180 | return V; | |||
181 | } | |||
182 | ||||
183 | // Opens a file and create a file object. Path has to be resolved already. | |||
184 | void LinkerDriver::addFile(StringRef Path, bool WithLOption) { | |||
185 | using namespace sys::fs; | |||
186 | ||||
187 | Optional<MemoryBufferRef> Buffer = readFile(Path); | |||
188 | if (!Buffer.hasValue()) | |||
189 | return; | |||
190 | MemoryBufferRef MBRef = *Buffer; | |||
191 | ||||
192 | if (Config->FormatBinary) { | |||
193 | Files.push_back(make<BinaryFile>(MBRef)); | |||
194 | return; | |||
195 | } | |||
196 | ||||
197 | switch (identify_magic(MBRef.getBuffer())) { | |||
198 | case file_magic::unknown: | |||
199 | readLinkerScript(MBRef); | |||
200 | return; | |||
201 | case file_magic::archive: { | |||
202 | // Handle -whole-archive. | |||
203 | if (InWholeArchive) { | |||
204 | for (const auto &P : getArchiveMembers(MBRef)) | |||
205 | Files.push_back(createObjectFile(P.first, Path, P.second)); | |||
206 | return; | |||
207 | } | |||
208 | ||||
209 | std::unique_ptr<Archive> File = | |||
210 | CHECK(Archive::create(MBRef), Path + ": failed to parse archive")check2((Archive::create(MBRef)), [&] { return toString(Path + ": failed to parse archive"); }); | |||
211 | ||||
212 | // If an archive file has no symbol table, it is likely that a user | |||
213 | // is attempting LTO and using a default ar command that doesn't | |||
214 | // understand the LLVM bitcode file. It is a pretty common error, so | |||
215 | // we'll handle it as if it had a symbol table. | |||
216 | if (!File->isEmpty() && !File->hasSymbolTable()) { | |||
217 | for (const auto &P : getArchiveMembers(MBRef)) | |||
218 | Files.push_back(make<LazyObjFile>(P.first, Path, P.second)); | |||
219 | return; | |||
220 | } | |||
221 | ||||
222 | // Handle the regular case. | |||
223 | Files.push_back(make<ArchiveFile>(std::move(File))); | |||
224 | return; | |||
225 | } | |||
226 | case file_magic::elf_shared_object: | |||
227 | if (Config->Relocatable) { | |||
228 | error("attempted static link of dynamic object " + Path); | |||
229 | return; | |||
230 | } | |||
231 | ||||
232 | // DSOs usually have DT_SONAME tags in their ELF headers, and the | |||
233 | // sonames are used to identify DSOs. But if they are missing, | |||
234 | // they are identified by filenames. We don't know whether the new | |||
235 | // file has a DT_SONAME or not because we haven't parsed it yet. | |||
236 | // Here, we set the default soname for the file because we might | |||
237 | // need it later. | |||
238 | // | |||
239 | // If a file was specified by -lfoo, the directory part is not | |||
240 | // significant, as a user did not specify it. This behavior is | |||
241 | // compatible with GNU. | |||
242 | Files.push_back( | |||
243 | createSharedFile(MBRef, WithLOption ? path::filename(Path) : Path)); | |||
244 | return; | |||
245 | case file_magic::bitcode: | |||
246 | case file_magic::elf_relocatable: | |||
247 | if (InLib) | |||
248 | Files.push_back(make<LazyObjFile>(MBRef, "", 0)); | |||
249 | else | |||
250 | Files.push_back(createObjectFile(MBRef)); | |||
251 | break; | |||
252 | default: | |||
253 | error(Path + ": unknown file type"); | |||
254 | } | |||
255 | } | |||
256 | ||||
257 | // Add a given library by searching it from input search paths. | |||
258 | void LinkerDriver::addLibrary(StringRef Name) { | |||
259 | if (Optional<std::string> Path = searchLibrary(Name)) | |||
260 | addFile(*Path, /*WithLOption=*/true); | |||
261 | else | |||
262 | error("unable to find library -l" + Name); | |||
263 | } | |||
264 | ||||
265 | // This function is called on startup. We need this for LTO since | |||
266 | // LTO calls LLVM functions to compile bitcode files to native code. | |||
267 | // Technically this can be delayed until we read bitcode files, but | |||
268 | // we don't bother to do lazily because the initialization is fast. | |||
269 | static void initLLVM() { | |||
270 | InitializeAllTargets(); | |||
271 | InitializeAllTargetMCs(); | |||
272 | InitializeAllAsmPrinters(); | |||
273 | InitializeAllAsmParsers(); | |||
274 | } | |||
275 | ||||
276 | // Some command line options or some combinations of them are not allowed. | |||
277 | // This function checks for such errors. | |||
278 | static void checkOptions(opt::InputArgList &Args) { | |||
279 | // The MIPS ABI as of 2016 does not support the GNU-style symbol lookup | |||
280 | // table which is a relatively new feature. | |||
281 | if (Config->EMachine == EM_MIPS && Config->GnuHash) | |||
282 | error("the .gnu.hash section is not compatible with the MIPS target"); | |||
283 | ||||
284 | if (Config->FixCortexA53Errata843419 && Config->EMachine != EM_AARCH64) | |||
285 | error("--fix-cortex-a53-843419 is only supported on AArch64 targets"); | |||
286 | ||||
287 | if (Config->TocOptimize && Config->EMachine != EM_PPC64) | |||
288 | error("--toc-optimize is only supported on the PowerPC64 target"); | |||
289 | ||||
290 | if (Config->Pie && Config->Shared) | |||
291 | error("-shared and -pie may not be used together"); | |||
292 | ||||
293 | if (!Config->Shared && !Config->FilterList.empty()) | |||
294 | error("-F may not be used without -shared"); | |||
295 | ||||
296 | if (!Config->Shared && !Config->AuxiliaryList.empty()) | |||
297 | error("-f may not be used without -shared"); | |||
298 | ||||
299 | if (!Config->Relocatable && !Config->DefineCommon) | |||
300 | error("-no-define-common not supported in non relocatable output"); | |||
301 | ||||
302 | if (Config->Relocatable) { | |||
303 | if (Config->Shared) | |||
304 | error("-r and -shared may not be used together"); | |||
305 | if (Config->GcSections) | |||
306 | error("-r and --gc-sections may not be used together"); | |||
307 | if (Config->GdbIndex) | |||
308 | error("-r and --gdb-index may not be used together"); | |||
309 | if (Config->ICF != ICFLevel::None) | |||
310 | error("-r and --icf may not be used together"); | |||
311 | if (Config->Pie) | |||
312 | error("-r and -pie may not be used together"); | |||
313 | } | |||
314 | ||||
315 | if (Config->ExecuteOnly) { | |||
316 | if (Config->EMachine != EM_AARCH64) | |||
317 | error("-execute-only is only supported on AArch64 targets"); | |||
318 | ||||
319 | if (Config->SingleRoRx && !Script->HasSectionsCommand) | |||
320 | error("-execute-only and -no-rosegment cannot be used together"); | |||
321 | } | |||
322 | } | |||
323 | ||||
324 | static const char *getReproduceOption(opt::InputArgList &Args) { | |||
325 | if (auto *Arg = Args.getLastArg(OPT_reproduce)) | |||
326 | return Arg->getValue(); | |||
327 | return getenv("LLD_REPRODUCE"); | |||
328 | } | |||
329 | ||||
330 | static bool hasZOption(opt::InputArgList &Args, StringRef Key) { | |||
331 | for (auto *Arg : Args.filtered(OPT_z)) | |||
332 | if (Key == Arg->getValue()) | |||
333 | return true; | |||
334 | return false; | |||
335 | } | |||
336 | ||||
337 | static bool getZFlag(opt::InputArgList &Args, StringRef K1, StringRef K2, | |||
338 | bool Default) { | |||
339 | for (auto *Arg : Args.filtered_reverse(OPT_z)) { | |||
340 | if (K1 == Arg->getValue()) | |||
341 | return true; | |||
342 | if (K2 == Arg->getValue()) | |||
343 | return false; | |||
344 | } | |||
345 | return Default; | |||
346 | } | |||
347 | ||||
348 | static bool isKnownZFlag(StringRef S) { | |||
349 | return S == "combreloc" || S == "copyreloc" || S == "defs" || | |||
350 | S == "execstack" || S == "global" || S == "hazardplt" || | |||
351 | S == "initfirst" || S == "interpose" || | |||
352 | S == "keep-text-section-prefix" || S == "lazy" || S == "muldefs" || | |||
353 | S == "nocombreloc" || S == "nocopyreloc" || S == "nodelete" || | |||
354 | S == "nodlopen" || S == "noexecstack" || | |||
355 | S == "nokeep-text-section-prefix" || S == "norelro" || S == "notext" || | |||
356 | S == "now" || S == "origin" || S == "relro" || S == "retpolineplt" || | |||
357 | S == "rodynamic" || S == "text" || S == "wxneeded" || | |||
358 | S.startswith("max-page-size=") || S.startswith("stack-size="); | |||
359 | } | |||
360 | ||||
361 | // Report an error for an unknown -z option. | |||
362 | static void checkZOptions(opt::InputArgList &Args) { | |||
363 | for (auto *Arg : Args.filtered(OPT_z)) | |||
364 | if (!isKnownZFlag(Arg->getValue())) | |||
365 | error("unknown -z value: " + StringRef(Arg->getValue())); | |||
366 | } | |||
367 | ||||
368 | void LinkerDriver::main(ArrayRef<const char *> ArgsArr) { | |||
369 | ELFOptTable Parser; | |||
370 | opt::InputArgList Args = Parser.parse(ArgsArr.slice(1)); | |||
371 | ||||
372 | // Interpret this flag early because error() depends on them. | |||
373 | errorHandler().ErrorLimit = args::getInteger(Args, OPT_error_limit, 20); | |||
374 | ||||
375 | // Handle -help | |||
376 | if (Args.hasArg(OPT_help)) { | |||
377 | printHelp(); | |||
378 | return; | |||
379 | } | |||
380 | ||||
381 | // Handle -v or -version. | |||
382 | // | |||
383 | // A note about "compatible with GNU linkers" message: this is a hack for | |||
384 | // scripts generated by GNU Libtool 2.4.6 (released in February 2014 and | |||
385 | // still the newest version in March 2017) or earlier to recognize LLD as | |||
386 | // a GNU compatible linker. As long as an output for the -v option | |||
387 | // contains "GNU" or "with BFD", they recognize us as GNU-compatible. | |||
388 | // | |||
389 | // This is somewhat ugly hack, but in reality, we had no choice other | |||
390 | // than doing this. Considering the very long release cycle of Libtool, | |||
391 | // it is not easy to improve it to recognize LLD as a GNU compatible | |||
392 | // linker in a timely manner. Even if we can make it, there are still a | |||
393 | // lot of "configure" scripts out there that are generated by old version | |||
394 | // of Libtool. We cannot convince every software developer to migrate to | |||
395 | // the latest version and re-generate scripts. So we have this hack. | |||
396 | if (Args.hasArg(OPT_v) || Args.hasArg(OPT_version)) | |||
397 | message(getLLDVersion() + " (compatible with GNU linkers)"); | |||
398 | ||||
399 | if (const char *Path = getReproduceOption(Args)) { | |||
400 | // Note that --reproduce is a debug option so you can ignore it | |||
401 | // if you are trying to understand the whole picture of the code. | |||
402 | Expected<std::unique_ptr<TarWriter>> ErrOrWriter = | |||
403 | TarWriter::create(Path, path::stem(Path)); | |||
404 | if (ErrOrWriter) { | |||
405 | Tar = ErrOrWriter->get(); | |||
406 | Tar->append("response.txt", createResponseFile(Args)); | |||
407 | Tar->append("version.txt", getLLDVersion() + "\n"); | |||
408 | make<std::unique_ptr<TarWriter>>(std::move(*ErrOrWriter)); | |||
409 | } else { | |||
410 | error(Twine("--reproduce: failed to open ") + Path + ": " + | |||
411 | toString(ErrOrWriter.takeError())); | |||
412 | } | |||
413 | } | |||
414 | ||||
415 | readConfigs(Args); | |||
416 | checkZOptions(Args); | |||
417 | ||||
418 | // The behavior of -v or --version is a bit strange, but this is | |||
419 | // needed for compatibility with GNU linkers. | |||
420 | if (Args.hasArg(OPT_v) && !Args.hasArg(OPT_INPUT)) | |||
421 | return; | |||
422 | if (Args.hasArg(OPT_version)) | |||
423 | return; | |||
424 | ||||
425 | initLLVM(); | |||
426 | createFiles(Args); | |||
427 | if (errorCount()) | |||
428 | return; | |||
429 | ||||
430 | inferMachineType(); | |||
431 | setConfigs(Args); | |||
432 | checkOptions(Args); | |||
433 | if (errorCount()) | |||
434 | return; | |||
435 | ||||
436 | switch (Config->EKind) { | |||
437 | case ELF32LEKind: | |||
438 | link<ELF32LE>(Args); | |||
439 | return; | |||
440 | case ELF32BEKind: | |||
441 | link<ELF32BE>(Args); | |||
442 | return; | |||
443 | case ELF64LEKind: | |||
444 | link<ELF64LE>(Args); | |||
445 | return; | |||
446 | case ELF64BEKind: | |||
447 | link<ELF64BE>(Args); | |||
448 | return; | |||
449 | default: | |||
450 | llvm_unreachable("unknown Config->EKind")::llvm::llvm_unreachable_internal("unknown Config->EKind", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lld/ELF/Driver.cpp" , 450); | |||
451 | } | |||
452 | } | |||
453 | ||||
454 | static std::string getRpath(opt::InputArgList &Args) { | |||
455 | std::vector<StringRef> V = args::getStrings(Args, OPT_rpath); | |||
456 | return llvm::join(V.begin(), V.end(), ":"); | |||
457 | } | |||
458 | ||||
459 | // Determines what we should do if there are remaining unresolved | |||
460 | // symbols after the name resolution. | |||
461 | static UnresolvedPolicy getUnresolvedSymbolPolicy(opt::InputArgList &Args) { | |||
462 | UnresolvedPolicy ErrorOrWarn = Args.hasFlag(OPT_error_unresolved_symbols, | |||
463 | OPT_warn_unresolved_symbols, true) | |||
464 | ? UnresolvedPolicy::ReportError | |||
465 | : UnresolvedPolicy::Warn; | |||
466 | ||||
467 | // Process the last of -unresolved-symbols, -no-undefined or -z defs. | |||
468 | for (auto *Arg : llvm::reverse(Args)) { | |||
469 | switch (Arg->getOption().getID()) { | |||
470 | case OPT_unresolved_symbols: { | |||
471 | StringRef S = Arg->getValue(); | |||
472 | if (S == "ignore-all" || S == "ignore-in-object-files") | |||
473 | return UnresolvedPolicy::Ignore; | |||
474 | if (S == "ignore-in-shared-libs" || S == "report-all") | |||
475 | return ErrorOrWarn; | |||
476 | error("unknown --unresolved-symbols value: " + S); | |||
477 | continue; | |||
478 | } | |||
479 | case OPT_no_undefined: | |||
480 | return ErrorOrWarn; | |||
481 | case OPT_z: | |||
482 | if (StringRef(Arg->getValue()) == "defs") | |||
483 | return ErrorOrWarn; | |||
484 | continue; | |||
485 | } | |||
486 | } | |||
487 | ||||
488 | // -shared implies -unresolved-symbols=ignore-all because missing | |||
489 | // symbols are likely to be resolved at runtime using other DSOs. | |||
490 | if (Config->Shared) | |||
491 | return UnresolvedPolicy::Ignore; | |||
492 | return ErrorOrWarn; | |||
493 | } | |||
494 | ||||
495 | static Target2Policy getTarget2(opt::InputArgList &Args) { | |||
496 | StringRef S = Args.getLastArgValue(OPT_target2, "got-rel"); | |||
497 | if (S == "rel") | |||
498 | return Target2Policy::Rel; | |||
499 | if (S == "abs") | |||
500 | return Target2Policy::Abs; | |||
501 | if (S == "got-rel") | |||
502 | return Target2Policy::GotRel; | |||
503 | error("unknown --target2 option: " + S); | |||
504 | return Target2Policy::GotRel; | |||
505 | } | |||
506 | ||||
507 | static bool isOutputFormatBinary(opt::InputArgList &Args) { | |||
508 | StringRef S = Args.getLastArgValue(OPT_oformat, "elf"); | |||
509 | if (S == "binary") | |||
510 | return true; | |||
511 | if (!S.startswith("elf")) | |||
512 | error("unknown --oformat value: " + S); | |||
513 | return false; | |||
514 | } | |||
515 | ||||
516 | static DiscardPolicy getDiscard(opt::InputArgList &Args) { | |||
517 | if (Args.hasArg(OPT_relocatable)) | |||
518 | return DiscardPolicy::None; | |||
519 | ||||
520 | auto *Arg = | |||
521 | Args.getLastArg(OPT_discard_all, OPT_discard_locals, OPT_discard_none); | |||
522 | if (!Arg) | |||
523 | return DiscardPolicy::Default; | |||
524 | if (Arg->getOption().getID() == OPT_discard_all) | |||
525 | return DiscardPolicy::All; | |||
526 | if (Arg->getOption().getID() == OPT_discard_locals) | |||
527 | return DiscardPolicy::Locals; | |||
528 | return DiscardPolicy::None; | |||
529 | } | |||
530 | ||||
531 | static StringRef getDynamicLinker(opt::InputArgList &Args) { | |||
532 | auto *Arg = Args.getLastArg(OPT_dynamic_linker, OPT_no_dynamic_linker); | |||
533 | if (!Arg || Arg->getOption().getID() == OPT_no_dynamic_linker) | |||
534 | return ""; | |||
535 | return Arg->getValue(); | |||
536 | } | |||
537 | ||||
538 | static ICFLevel getICF(opt::InputArgList &Args) { | |||
539 | auto *Arg = Args.getLastArg(OPT_icf_none, OPT_icf_safe, OPT_icf_all); | |||
540 | if (!Arg || Arg->getOption().getID() == OPT_icf_none) | |||
541 | return ICFLevel::None; | |||
542 | if (Arg->getOption().getID() == OPT_icf_safe) | |||
543 | return ICFLevel::Safe; | |||
544 | return ICFLevel::All; | |||
545 | } | |||
546 | ||||
547 | static StripPolicy getStrip(opt::InputArgList &Args) { | |||
548 | if (Args.hasArg(OPT_relocatable)) | |||
549 | return StripPolicy::None; | |||
550 | ||||
551 | auto *Arg = Args.getLastArg(OPT_strip_all, OPT_strip_debug); | |||
552 | if (!Arg) | |||
553 | return StripPolicy::None; | |||
554 | if (Arg->getOption().getID() == OPT_strip_all) | |||
555 | return StripPolicy::All; | |||
556 | return StripPolicy::Debug; | |||
557 | } | |||
558 | ||||
559 | static uint64_t parseSectionAddress(StringRef S, const opt::Arg &Arg) { | |||
560 | uint64_t VA = 0; | |||
561 | if (S.startswith("0x")) | |||
562 | S = S.drop_front(2); | |||
563 | if (!to_integer(S, VA, 16)) | |||
564 | error("invalid argument: " + toString(Arg)); | |||
565 | return VA; | |||
566 | } | |||
567 | ||||
568 | static StringMap<uint64_t> getSectionStartMap(opt::InputArgList &Args) { | |||
569 | StringMap<uint64_t> Ret; | |||
570 | for (auto *Arg : Args.filtered(OPT_section_start)) { | |||
571 | StringRef Name; | |||
572 | StringRef Addr; | |||
573 | std::tie(Name, Addr) = StringRef(Arg->getValue()).split('='); | |||
574 | Ret[Name] = parseSectionAddress(Addr, *Arg); | |||
575 | } | |||
576 | ||||
577 | if (auto *Arg = Args.getLastArg(OPT_Ttext)) | |||
578 | Ret[".text"] = parseSectionAddress(Arg->getValue(), *Arg); | |||
579 | if (auto *Arg = Args.getLastArg(OPT_Tdata)) | |||
580 | Ret[".data"] = parseSectionAddress(Arg->getValue(), *Arg); | |||
581 | if (auto *Arg = Args.getLastArg(OPT_Tbss)) | |||
582 | Ret[".bss"] = parseSectionAddress(Arg->getValue(), *Arg); | |||
583 | return Ret; | |||
584 | } | |||
585 | ||||
586 | static SortSectionPolicy getSortSection(opt::InputArgList &Args) { | |||
587 | StringRef S = Args.getLastArgValue(OPT_sort_section); | |||
588 | if (S == "alignment") | |||
589 | return SortSectionPolicy::Alignment; | |||
590 | if (S == "name") | |||
591 | return SortSectionPolicy::Name; | |||
592 | if (!S.empty()) | |||
593 | error("unknown --sort-section rule: " + S); | |||
594 | return SortSectionPolicy::Default; | |||
595 | } | |||
596 | ||||
597 | static OrphanHandlingPolicy getOrphanHandling(opt::InputArgList &Args) { | |||
598 | StringRef S = Args.getLastArgValue(OPT_orphan_handling, "place"); | |||
599 | if (S == "warn") | |||
600 | return OrphanHandlingPolicy::Warn; | |||
601 | if (S == "error") | |||
602 | return OrphanHandlingPolicy::Error; | |||
603 | if (S != "place") | |||
604 | error("unknown --orphan-handling mode: " + S); | |||
605 | return OrphanHandlingPolicy::Place; | |||
606 | } | |||
607 | ||||
608 | // Parse --build-id or --build-id=<style>. We handle "tree" as a | |||
609 | // synonym for "sha1" because all our hash functions including | |||
610 | // -build-id=sha1 are actually tree hashes for performance reasons. | |||
611 | static std::pair<BuildIdKind, std::vector<uint8_t>> | |||
612 | getBuildId(opt::InputArgList &Args) { | |||
613 | auto *Arg = Args.getLastArg(OPT_build_id, OPT_build_id_eq); | |||
614 | if (!Arg) | |||
615 | return {BuildIdKind::None, {}}; | |||
616 | ||||
617 | if (Arg->getOption().getID() == OPT_build_id) | |||
618 | return {BuildIdKind::Fast, {}}; | |||
619 | ||||
620 | StringRef S = Arg->getValue(); | |||
621 | if (S == "fast") | |||
622 | return {BuildIdKind::Fast, {}}; | |||
623 | if (S == "md5") | |||
624 | return {BuildIdKind::Md5, {}}; | |||
625 | if (S == "sha1" || S == "tree") | |||
626 | return {BuildIdKind::Sha1, {}}; | |||
627 | if (S == "uuid") | |||
628 | return {BuildIdKind::Uuid, {}}; | |||
629 | if (S.startswith("0x")) | |||
630 | return {BuildIdKind::Hexstring, parseHex(S.substr(2))}; | |||
631 | ||||
632 | if (S != "none") | |||
633 | error("unknown --build-id style: " + S); | |||
634 | return {BuildIdKind::None, {}}; | |||
635 | } | |||
636 | ||||
637 | static std::pair<bool, bool> getPackDynRelocs(opt::InputArgList &Args) { | |||
638 | StringRef S = Args.getLastArgValue(OPT_pack_dyn_relocs, "none"); | |||
639 | if (S == "android") | |||
640 | return {true, false}; | |||
641 | if (S == "relr") | |||
642 | return {false, true}; | |||
643 | if (S == "android+relr") | |||
644 | return {true, true}; | |||
645 | ||||
646 | if (S != "none") | |||
647 | error("unknown -pack-dyn-relocs format: " + S); | |||
648 | return {false, false}; | |||
649 | } | |||
650 | ||||
651 | static void readCallGraph(MemoryBufferRef MB) { | |||
652 | // Build a map from symbol name to section | |||
653 | DenseMap<StringRef, Symbol *> Map; | |||
654 | for (InputFile *File : ObjectFiles) | |||
655 | for (Symbol *Sym : File->getSymbols()) | |||
656 | Map[Sym->getName()] = Sym; | |||
657 | ||||
658 | auto FindSection = [&](StringRef Name) -> InputSectionBase * { | |||
659 | Symbol *Sym = Map.lookup(Name); | |||
660 | if (!Sym) { | |||
661 | if (Config->WarnSymbolOrdering) | |||
662 | warn(MB.getBufferIdentifier() + ": no such symbol: " + Name); | |||
663 | return nullptr; | |||
664 | } | |||
665 | maybeWarnUnorderableSymbol(Sym); | |||
666 | ||||
667 | if (Defined *DR = dyn_cast_or_null<Defined>(Sym)) | |||
668 | return dyn_cast_or_null<InputSectionBase>(DR->Section); | |||
669 | return nullptr; | |||
670 | }; | |||
671 | ||||
672 | for (StringRef Line : args::getLines(MB)) { | |||
673 | SmallVector<StringRef, 3> Fields; | |||
674 | Line.split(Fields, ' '); | |||
675 | uint64_t Count; | |||
676 | ||||
677 | if (Fields.size() != 3 || !to_integer(Fields[2], Count)) { | |||
678 | error(MB.getBufferIdentifier() + ": parse error"); | |||
679 | return; | |||
680 | } | |||
681 | ||||
682 | if (InputSectionBase *From = FindSection(Fields[0])) | |||
683 | if (InputSectionBase *To = FindSection(Fields[1])) | |||
684 | Config->CallGraphProfile[std::make_pair(From, To)] += Count; | |||
685 | } | |||
686 | } | |||
687 | ||||
688 | template <class ELFT> static void readCallGraphsFromObjectFiles() { | |||
689 | for (auto File : ObjectFiles) { | |||
690 | auto *Obj = cast<ObjFile<ELFT>>(File); | |||
691 | ||||
692 | for (const Elf_CGProfile_Impl<ELFT> &CGPE : Obj->CGProfile) { | |||
693 | auto *FromSym = dyn_cast<Defined>(&Obj->getSymbol(CGPE.cgp_from)); | |||
694 | auto *ToSym = dyn_cast<Defined>(&Obj->getSymbol(CGPE.cgp_to)); | |||
695 | if (!FromSym || !ToSym) | |||
696 | continue; | |||
697 | ||||
698 | auto *From = dyn_cast_or_null<InputSectionBase>(FromSym->Section); | |||
699 | auto *To = dyn_cast_or_null<InputSectionBase>(ToSym->Section); | |||
700 | if (From && To) | |||
701 | Config->CallGraphProfile[{From, To}] += CGPE.cgp_weight; | |||
702 | } | |||
703 | } | |||
704 | } | |||
705 | ||||
706 | static bool getCompressDebugSections(opt::InputArgList &Args) { | |||
707 | StringRef S = Args.getLastArgValue(OPT_compress_debug_sections, "none"); | |||
708 | if (S == "none") | |||
709 | return false; | |||
710 | if (S != "zlib") | |||
711 | error("unknown --compress-debug-sections value: " + S); | |||
712 | if (!zlib::isAvailable()) | |||
713 | error("--compress-debug-sections: zlib is not available"); | |||
714 | return true; | |||
715 | } | |||
716 | ||||
717 | static std::pair<StringRef, StringRef> getOldNewOptions(opt::InputArgList &Args, | |||
718 | unsigned Id) { | |||
719 | auto *Arg = Args.getLastArg(Id); | |||
720 | if (!Arg) | |||
721 | return {"", ""}; | |||
722 | ||||
723 | StringRef S = Arg->getValue(); | |||
724 | std::pair<StringRef, StringRef> Ret = S.split(';'); | |||
725 | if (Ret.second.empty()) | |||
726 | error(Arg->getSpelling() + " expects 'old;new' format, but got " + S); | |||
727 | return Ret; | |||
728 | } | |||
729 | ||||
730 | // Parse the symbol ordering file and warn for any duplicate entries. | |||
731 | static std::vector<StringRef> getSymbolOrderingFile(MemoryBufferRef MB) { | |||
732 | SetVector<StringRef> Names; | |||
733 | for (StringRef S : args::getLines(MB)) | |||
734 | if (!Names.insert(S) && Config->WarnSymbolOrdering) | |||
735 | warn(MB.getBufferIdentifier() + ": duplicate ordered symbol: " + S); | |||
736 | ||||
737 | return Names.takeVector(); | |||
738 | } | |||
739 | ||||
740 | static void parseClangOption(StringRef Opt, const Twine &Msg) { | |||
741 | std::string Err; | |||
742 | raw_string_ostream OS(Err); | |||
743 | ||||
744 | const char *Argv[] = {Config->ProgName.data(), Opt.data()}; | |||
745 | if (cl::ParseCommandLineOptions(2, Argv, "", &OS)) | |||
746 | return; | |||
747 | OS.flush(); | |||
748 | error(Msg + ": " + StringRef(Err).trim()); | |||
749 | } | |||
750 | ||||
751 | // Initializes Config members by the command line options. | |||
752 | void LinkerDriver::readConfigs(opt::InputArgList &Args) { | |||
753 | errorHandler().Verbose = Args.hasArg(OPT_verbose); | |||
754 | errorHandler().FatalWarnings = | |||
755 | Args.hasFlag(OPT_fatal_warnings, OPT_no_fatal_warnings, false); | |||
756 | ThreadsEnabled = Args.hasFlag(OPT_threads, OPT_no_threads, true); | |||
757 | ||||
758 | Config->AllowMultipleDefinition = | |||
759 | Args.hasFlag(OPT_allow_multiple_definition, | |||
760 | OPT_no_allow_multiple_definition, false) || | |||
761 | hasZOption(Args, "muldefs"); | |||
762 | Config->AuxiliaryList = args::getStrings(Args, OPT_auxiliary); | |||
763 | Config->Bsymbolic = Args.hasArg(OPT_Bsymbolic); | |||
764 | Config->BsymbolicFunctions = Args.hasArg(OPT_Bsymbolic_functions); | |||
765 | Config->CheckSections = | |||
766 | Args.hasFlag(OPT_check_sections, OPT_no_check_sections, true); | |||
767 | Config->Chroot = Args.getLastArgValue(OPT_chroot); | |||
768 | Config->CompressDebugSections = getCompressDebugSections(Args); | |||
769 | Config->Cref = Args.hasFlag(OPT_cref, OPT_no_cref, false); | |||
770 | Config->DefineCommon = Args.hasFlag(OPT_define_common, OPT_no_define_common, | |||
771 | !Args.hasArg(OPT_relocatable)); | |||
772 | Config->Demangle = Args.hasFlag(OPT_demangle, OPT_no_demangle, true); | |||
773 | Config->DisableVerify = Args.hasArg(OPT_disable_verify); | |||
774 | Config->Discard = getDiscard(Args); | |||
775 | Config->DwoDir = Args.getLastArgValue(OPT_plugin_opt_dwo_dir_eq); | |||
776 | Config->DynamicLinker = getDynamicLinker(Args); | |||
777 | Config->EhFrameHdr = | |||
778 | Args.hasFlag(OPT_eh_frame_hdr, OPT_no_eh_frame_hdr, false); | |||
779 | Config->EmitRelocs = Args.hasArg(OPT_emit_relocs); | |||
780 | Config->CallGraphProfileSort = Args.hasFlag( | |||
781 | OPT_call_graph_profile_sort, OPT_no_call_graph_profile_sort, true); | |||
782 | Config->EnableNewDtags = | |||
783 | Args.hasFlag(OPT_enable_new_dtags, OPT_disable_new_dtags, true); | |||
784 | Config->Entry = Args.getLastArgValue(OPT_entry); | |||
785 | Config->ExecuteOnly = | |||
786 | Args.hasFlag(OPT_execute_only, OPT_no_execute_only, false); | |||
787 | Config->ExportDynamic = | |||
788 | Args.hasFlag(OPT_export_dynamic, OPT_no_export_dynamic, false); | |||
789 | Config->FilterList = args::getStrings(Args, OPT_filter); | |||
790 | Config->Fini = Args.getLastArgValue(OPT_fini, "_fini"); | |||
791 | Config->FixCortexA53Errata843419 = Args.hasArg(OPT_fix_cortex_a53_843419); | |||
792 | Config->GcSections = Args.hasFlag(OPT_gc_sections, OPT_no_gc_sections, false); | |||
793 | Config->GnuUnique = Args.hasFlag(OPT_gnu_unique, OPT_no_gnu_unique, true); | |||
794 | Config->GdbIndex = Args.hasFlag(OPT_gdb_index, OPT_no_gdb_index, false); | |||
795 | Config->ICF = getICF(Args); | |||
796 | Config->IgnoreDataAddressEquality = | |||
797 | Args.hasArg(OPT_ignore_data_address_equality); | |||
798 | Config->IgnoreFunctionAddressEquality = | |||
799 | Args.hasArg(OPT_ignore_function_address_equality); | |||
800 | Config->Init = Args.getLastArgValue(OPT_init, "_init"); | |||
801 | Config->LTOAAPipeline = Args.getLastArgValue(OPT_lto_aa_pipeline); | |||
802 | Config->LTODebugPassManager = Args.hasArg(OPT_lto_debug_pass_manager); | |||
803 | Config->LTONewPassManager = Args.hasArg(OPT_lto_new_pass_manager); | |||
804 | Config->LTONewPmPasses = Args.getLastArgValue(OPT_lto_newpm_passes); | |||
805 | Config->LTOO = args::getInteger(Args, OPT_lto_O, 2); | |||
806 | Config->LTOObjPath = Args.getLastArgValue(OPT_plugin_opt_obj_path_eq); | |||
807 | Config->LTOPartitions = args::getInteger(Args, OPT_lto_partitions, 1); | |||
808 | Config->LTOSampleProfile = Args.getLastArgValue(OPT_lto_sample_profile); | |||
809 | Config->MapFile = Args.getLastArgValue(OPT_Map); | |||
810 | Config->MipsGotSize = args::getInteger(Args, OPT_mips_got_size, 0xfff0); | |||
811 | Config->MergeArmExidx = | |||
812 | Args.hasFlag(OPT_merge_exidx_entries, OPT_no_merge_exidx_entries, true); | |||
813 | Config->NoinhibitExec = Args.hasArg(OPT_noinhibit_exec); | |||
814 | Config->Nostdlib = Args.hasArg(OPT_nostdlib); | |||
815 | Config->OFormatBinary = isOutputFormatBinary(Args); | |||
816 | Config->Omagic = Args.hasFlag(OPT_omagic, OPT_no_omagic, false); | |||
817 | Config->OptRemarksFilename = Args.getLastArgValue(OPT_opt_remarks_filename); | |||
818 | Config->OptRemarksWithHotness = Args.hasArg(OPT_opt_remarks_with_hotness); | |||
819 | Config->Optimize = args::getInteger(Args, OPT_O, 1); | |||
820 | Config->OrphanHandling = getOrphanHandling(Args); | |||
821 | Config->OutputFile = Args.getLastArgValue(OPT_o); | |||
822 | Config->Pie = Args.hasFlag(OPT_pie, OPT_no_pie, false); | |||
823 | Config->PrintIcfSections = | |||
824 | Args.hasFlag(OPT_print_icf_sections, OPT_no_print_icf_sections, false); | |||
825 | Config->PrintGcSections = | |||
826 | Args.hasFlag(OPT_print_gc_sections, OPT_no_print_gc_sections, false); | |||
827 | Config->Rpath = getRpath(Args); | |||
828 | Config->Relocatable = Args.hasArg(OPT_relocatable); | |||
829 | Config->SaveTemps = Args.hasArg(OPT_save_temps); | |||
830 | Config->SearchPaths = args::getStrings(Args, OPT_library_path); | |||
831 | Config->SectionStartMap = getSectionStartMap(Args); | |||
832 | Config->Shared = Args.hasArg(OPT_shared); | |||
833 | Config->SingleRoRx = Args.hasArg(OPT_no_rosegment); | |||
834 | Config->SoName = Args.getLastArgValue(OPT_soname); | |||
835 | Config->SortSection = getSortSection(Args); | |||
836 | Config->SplitStackAdjustSize = args::getInteger(Args, OPT_split_stack_adjust_size, 16384); | |||
837 | Config->Strip = getStrip(Args); | |||
838 | Config->Sysroot = Args.getLastArgValue(OPT_sysroot); | |||
839 | Config->Target1Rel = Args.hasFlag(OPT_target1_rel, OPT_target1_abs, false); | |||
840 | Config->Target2 = getTarget2(Args); | |||
841 | Config->ThinLTOCacheDir = Args.getLastArgValue(OPT_thinlto_cache_dir); | |||
842 | Config->ThinLTOCachePolicy = CHECK(check2((parseCachePruningPolicy(Args.getLastArgValue(OPT_thinlto_cache_policy ))), [&] { return toString("--thinlto-cache-policy: invalid cache policy" ); }) | |||
843 | parseCachePruningPolicy(Args.getLastArgValue(OPT_thinlto_cache_policy)),check2((parseCachePruningPolicy(Args.getLastArgValue(OPT_thinlto_cache_policy ))), [&] { return toString("--thinlto-cache-policy: invalid cache policy" ); }) | |||
844 | "--thinlto-cache-policy: invalid cache policy")check2((parseCachePruningPolicy(Args.getLastArgValue(OPT_thinlto_cache_policy ))), [&] { return toString("--thinlto-cache-policy: invalid cache policy" ); }); | |||
845 | Config->ThinLTOEmitImportsFiles = | |||
846 | Args.hasArg(OPT_plugin_opt_thinlto_emit_imports_files); | |||
847 | Config->ThinLTOIndexOnly = Args.hasArg(OPT_plugin_opt_thinlto_index_only) || | |||
848 | Args.hasArg(OPT_plugin_opt_thinlto_index_only_eq); | |||
849 | Config->ThinLTOIndexOnlyArg = | |||
850 | Args.getLastArgValue(OPT_plugin_opt_thinlto_index_only_eq); | |||
851 | Config->ThinLTOJobs = args::getInteger(Args, OPT_thinlto_jobs, -1u); | |||
852 | Config->ThinLTOObjectSuffixReplace = | |||
853 | getOldNewOptions(Args, OPT_plugin_opt_thinlto_object_suffix_replace_eq); | |||
854 | Config->ThinLTOPrefixReplace = | |||
855 | getOldNewOptions(Args, OPT_plugin_opt_thinlto_prefix_replace_eq); | |||
856 | Config->Trace = Args.hasArg(OPT_trace); | |||
857 | Config->Undefined = args::getStrings(Args, OPT_undefined); | |||
858 | Config->UndefinedVersion = | |||
859 | Args.hasFlag(OPT_undefined_version, OPT_no_undefined_version, true); | |||
860 | Config->UseAndroidRelrTags = Args.hasFlag( | |||
861 | OPT_use_android_relr_tags, OPT_no_use_android_relr_tags, false); | |||
862 | Config->UnresolvedSymbols = getUnresolvedSymbolPolicy(Args); | |||
863 | Config->WarnBackrefs = | |||
864 | Args.hasFlag(OPT_warn_backrefs, OPT_no_warn_backrefs, false); | |||
865 | Config->WarnCommon = Args.hasFlag(OPT_warn_common, OPT_no_warn_common, false); | |||
866 | Config->WarnIfuncTextrel = | |||
867 | Args.hasFlag(OPT_warn_ifunc_textrel, OPT_no_warn_ifunc_textrel, false); | |||
868 | Config->WarnSymbolOrdering = | |||
869 | Args.hasFlag(OPT_warn_symbol_ordering, OPT_no_warn_symbol_ordering, true); | |||
870 | Config->ZCombreloc = getZFlag(Args, "combreloc", "nocombreloc", true); | |||
871 | Config->ZCopyreloc = getZFlag(Args, "copyreloc", "nocopyreloc", true); | |||
872 | Config->ZExecstack = getZFlag(Args, "execstack", "noexecstack", false); | |||
873 | Config->ZGlobal = hasZOption(Args, "global"); | |||
874 | Config->ZHazardplt = hasZOption(Args, "hazardplt"); | |||
875 | Config->ZInitfirst = hasZOption(Args, "initfirst"); | |||
876 | Config->ZInterpose = hasZOption(Args, "interpose"); | |||
877 | Config->ZKeepTextSectionPrefix = getZFlag( | |||
878 | Args, "keep-text-section-prefix", "nokeep-text-section-prefix", false); | |||
879 | Config->ZNodelete = hasZOption(Args, "nodelete"); | |||
880 | Config->ZNodlopen = hasZOption(Args, "nodlopen"); | |||
881 | Config->ZNow = getZFlag(Args, "now", "lazy", false); | |||
882 | Config->ZOrigin = hasZOption(Args, "origin"); | |||
883 | Config->ZRelro = getZFlag(Args, "relro", "norelro", true); | |||
884 | Config->ZRetpolineplt = hasZOption(Args, "retpolineplt"); | |||
885 | Config->ZRodynamic = hasZOption(Args, "rodynamic"); | |||
886 | Config->ZStackSize = args::getZOptionValue(Args, OPT_z, "stack-size", 0); | |||
887 | Config->ZText = getZFlag(Args, "text", "notext", true); | |||
888 | Config->ZWxneeded = hasZOption(Args, "wxneeded"); | |||
889 | ||||
890 | // Parse LTO options. | |||
891 | if (auto *Arg = Args.getLastArg(OPT_plugin_opt_mcpu_eq)) | |||
892 | parseClangOption(Saver.save("-mcpu=" + StringRef(Arg->getValue())), | |||
893 | Arg->getSpelling()); | |||
894 | ||||
895 | for (auto *Arg : Args.filtered(OPT_plugin_opt)) | |||
896 | parseClangOption(Arg->getValue(), Arg->getSpelling()); | |||
897 | ||||
898 | // Parse -mllvm options. | |||
899 | for (auto *Arg : Args.filtered(OPT_mllvm)) | |||
900 | parseClangOption(Arg->getValue(), Arg->getSpelling()); | |||
901 | ||||
902 | if (Config->LTOO > 3) | |||
903 | error("invalid optimization level for LTO: " + Twine(Config->LTOO)); | |||
904 | if (Config->LTOPartitions == 0) | |||
905 | error("--lto-partitions: number of threads must be > 0"); | |||
906 | if (Config->ThinLTOJobs == 0) | |||
907 | error("--thinlto-jobs: number of threads must be > 0"); | |||
908 | ||||
909 | if (Config->SplitStackAdjustSize < 0) | |||
910 | error("--split-stack-adjust-size: size must be >= 0"); | |||
911 | ||||
912 | // Parse ELF{32,64}{LE,BE} and CPU type. | |||
913 | if (auto *Arg = Args.getLastArg(OPT_m)) { | |||
914 | StringRef S = Arg->getValue(); | |||
915 | std::tie(Config->EKind, Config->EMachine, Config->OSABI) = | |||
916 | parseEmulation(S); | |||
917 | Config->MipsN32Abi = (S == "elf32btsmipn32" || S == "elf32ltsmipn32"); | |||
918 | Config->Emulation = S; | |||
919 | } | |||
920 | ||||
921 | // Parse -hash-style={sysv,gnu,both}. | |||
922 | if (auto *Arg = Args.getLastArg(OPT_hash_style)) { | |||
923 | StringRef S = Arg->getValue(); | |||
924 | if (S == "sysv") | |||
925 | Config->SysvHash = true; | |||
926 | else if (S == "gnu") | |||
927 | Config->GnuHash = true; | |||
928 | else if (S == "both") | |||
929 | Config->SysvHash = Config->GnuHash = true; | |||
930 | else | |||
931 | error("unknown -hash-style: " + S); | |||
932 | } | |||
933 | ||||
934 | if (Args.hasArg(OPT_print_map)) | |||
935 | Config->MapFile = "-"; | |||
936 | ||||
937 | // --omagic is an option to create old-fashioned executables in which | |||
938 | // .text segments are writable. Today, the option is still in use to | |||
939 | // create special-purpose programs such as boot loaders. It doesn't | |||
940 | // make sense to create PT_GNU_RELRO for such executables. | |||
941 | if (Config->Omagic) | |||
942 | Config->ZRelro = false; | |||
943 | ||||
944 | std::tie(Config->BuildId, Config->BuildIdVector) = getBuildId(Args); | |||
945 | ||||
946 | std::tie(Config->AndroidPackDynRelocs, Config->RelrPackDynRelocs) = | |||
947 | getPackDynRelocs(Args); | |||
948 | ||||
949 | if (auto *Arg = Args.getLastArg(OPT_symbol_ordering_file)) | |||
950 | if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) | |||
951 | Config->SymbolOrderingFile = getSymbolOrderingFile(*Buffer); | |||
952 | ||||
953 | // If --retain-symbol-file is used, we'll keep only the symbols listed in | |||
954 | // the file and discard all others. | |||
955 | if (auto *Arg = Args.getLastArg(OPT_retain_symbols_file)) { | |||
956 | Config->DefaultSymbolVersion = VER_NDX_LOCAL; | |||
957 | if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) | |||
958 | for (StringRef S : args::getLines(*Buffer)) | |||
959 | Config->VersionScriptGlobals.push_back( | |||
960 | {S, /*IsExternCpp*/ false, /*HasWildcard*/ false}); | |||
961 | } | |||
962 | ||||
963 | bool HasExportDynamic = | |||
964 | Args.hasFlag(OPT_export_dynamic, OPT_no_export_dynamic, false); | |||
965 | ||||
966 | // Parses -dynamic-list and -export-dynamic-symbol. They make some | |||
967 | // symbols private. Note that -export-dynamic takes precedence over them | |||
968 | // as it says all symbols should be exported. | |||
969 | if (!HasExportDynamic) { | |||
970 | for (auto *Arg : Args.filtered(OPT_dynamic_list)) | |||
971 | if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) | |||
972 | readDynamicList(*Buffer); | |||
973 | ||||
974 | for (auto *Arg : Args.filtered(OPT_export_dynamic_symbol)) | |||
975 | Config->DynamicList.push_back( | |||
976 | {Arg->getValue(), /*IsExternCpp*/ false, /*HasWildcard*/ false}); | |||
977 | } | |||
978 | ||||
979 | // If --export-dynamic-symbol=foo is given and symbol foo is defined in | |||
980 | // an object file in an archive file, that object file should be pulled | |||
981 | // out and linked. (It doesn't have to behave like that from technical | |||
982 | // point of view, but this is needed for compatibility with GNU.) | |||
983 | for (auto *Arg : Args.filtered(OPT_export_dynamic_symbol)) | |||
984 | Config->Undefined.push_back(Arg->getValue()); | |||
985 | ||||
986 | for (auto *Arg : Args.filtered(OPT_version_script)) | |||
987 | if (Optional<std::string> Path = searchScript(Arg->getValue())) { | |||
988 | if (Optional<MemoryBufferRef> Buffer = readFile(*Path)) | |||
989 | readVersionScript(*Buffer); | |||
990 | } else { | |||
991 | error(Twine("cannot find version script ") + Arg->getValue()); | |||
992 | } | |||
993 | } | |||
994 | ||||
995 | // Some Config members do not directly correspond to any particular | |||
996 | // command line options, but computed based on other Config values. | |||
997 | // This function initialize such members. See Config.h for the details | |||
998 | // of these values. | |||
999 | static void setConfigs(opt::InputArgList &Args) { | |||
1000 | ELFKind K = Config->EKind; | |||
1001 | uint16_t M = Config->EMachine; | |||
1002 | ||||
1003 | Config->CopyRelocs = (Config->Relocatable || Config->EmitRelocs); | |||
1004 | Config->Is64 = (K == ELF64LEKind || K == ELF64BEKind); | |||
1005 | Config->IsLE = (K == ELF32LEKind || K == ELF64LEKind); | |||
1006 | Config->Endianness = Config->IsLE ? endianness::little : endianness::big; | |||
1007 | Config->IsMips64EL = (K == ELF64LEKind && M == EM_MIPS); | |||
1008 | Config->Pic = Config->Pie || Config->Shared; | |||
1009 | Config->Wordsize = Config->Is64 ? 8 : 4; | |||
1010 | ||||
1011 | // ELF defines two different ways to store relocation addends as shown below: | |||
1012 | // | |||
1013 | // Rel: Addends are stored to the location where relocations are applied. | |||
1014 | // Rela: Addends are stored as part of relocation entry. | |||
1015 | // | |||
1016 | // In other words, Rela makes it easy to read addends at the price of extra | |||
1017 | // 4 or 8 byte for each relocation entry. We don't know why ELF defined two | |||
1018 | // different mechanisms in the first place, but this is how the spec is | |||
1019 | // defined. | |||
1020 | // | |||
1021 | // You cannot choose which one, Rel or Rela, you want to use. Instead each | |||
1022 | // ABI defines which one you need to use. The following expression expresses | |||
1023 | // that. | |||
1024 | Config->IsRela = M == EM_AARCH64 || M == EM_AMDGPU || M == EM_HEXAGON || | |||
1025 | M == EM_PPC || M == EM_PPC64 || M == EM_RISCV || | |||
1026 | M == EM_X86_64; | |||
1027 | ||||
1028 | // If the output uses REL relocations we must store the dynamic relocation | |||
1029 | // addends to the output sections. We also store addends for RELA relocations | |||
1030 | // if --apply-dynamic-relocs is used. | |||
1031 | // We default to not writing the addends when using RELA relocations since | |||
1032 | // any standard conforming tool can find it in r_addend. | |||
1033 | Config->WriteAddends = Args.hasFlag(OPT_apply_dynamic_relocs, | |||
1034 | OPT_no_apply_dynamic_relocs, false) || | |||
1035 | !Config->IsRela; | |||
1036 | ||||
1037 | Config->TocOptimize = | |||
1038 | Args.hasFlag(OPT_toc_optimize, OPT_no_toc_optimize, M == EM_PPC64); | |||
1039 | } | |||
1040 | ||||
1041 | // Returns a value of "-format" option. | |||
1042 | static bool isFormatBinary(StringRef S) { | |||
1043 | if (S == "binary") | |||
1044 | return true; | |||
1045 | if (S == "elf" || S == "default") | |||
1046 | return false; | |||
1047 | error("unknown -format value: " + S + | |||
1048 | " (supported formats: elf, default, binary)"); | |||
1049 | return false; | |||
1050 | } | |||
1051 | ||||
1052 | void LinkerDriver::createFiles(opt::InputArgList &Args) { | |||
1053 | // For --{push,pop}-state. | |||
1054 | std::vector<std::tuple<bool, bool, bool>> Stack; | |||
1055 | ||||
1056 | // Iterate over argv to process input files and positional arguments. | |||
1057 | for (auto *Arg : Args) { | |||
1058 | switch (Arg->getOption().getUnaliasedOption().getID()) { | |||
1059 | case OPT_library: | |||
1060 | addLibrary(Arg->getValue()); | |||
1061 | break; | |||
1062 | case OPT_INPUT: | |||
1063 | addFile(Arg->getValue(), /*WithLOption=*/false); | |||
1064 | break; | |||
1065 | case OPT_defsym: { | |||
1066 | StringRef From; | |||
1067 | StringRef To; | |||
1068 | std::tie(From, To) = StringRef(Arg->getValue()).split('='); | |||
1069 | if (From.empty() || To.empty()) | |||
1070 | error("-defsym: syntax error: " + StringRef(Arg->getValue())); | |||
1071 | else | |||
1072 | readDefsym(From, MemoryBufferRef(To, "-defsym")); | |||
1073 | break; | |||
1074 | } | |||
1075 | case OPT_script: | |||
1076 | if (Optional<std::string> Path = searchScript(Arg->getValue())) { | |||
1077 | if (Optional<MemoryBufferRef> MB = readFile(*Path)) | |||
1078 | readLinkerScript(*MB); | |||
1079 | break; | |||
1080 | } | |||
1081 | error(Twine("cannot find linker script ") + Arg->getValue()); | |||
1082 | break; | |||
1083 | case OPT_as_needed: | |||
1084 | Config->AsNeeded = true; | |||
1085 | break; | |||
1086 | case OPT_format: | |||
1087 | Config->FormatBinary = isFormatBinary(Arg->getValue()); | |||
1088 | break; | |||
1089 | case OPT_no_as_needed: | |||
1090 | Config->AsNeeded = false; | |||
1091 | break; | |||
1092 | case OPT_Bstatic: | |||
1093 | Config->Static = true; | |||
1094 | break; | |||
1095 | case OPT_Bdynamic: | |||
1096 | Config->Static = false; | |||
1097 | break; | |||
1098 | case OPT_whole_archive: | |||
1099 | InWholeArchive = true; | |||
1100 | break; | |||
1101 | case OPT_no_whole_archive: | |||
1102 | InWholeArchive = false; | |||
1103 | break; | |||
1104 | case OPT_just_symbols: | |||
1105 | if (Optional<MemoryBufferRef> MB = readFile(Arg->getValue())) { | |||
1106 | Files.push_back(createObjectFile(*MB)); | |||
1107 | Files.back()->JustSymbols = true; | |||
1108 | } | |||
1109 | break; | |||
1110 | case OPT_start_group: | |||
1111 | if (InputFile::IsInGroup) | |||
1112 | error("nested --start-group"); | |||
1113 | InputFile::IsInGroup = true; | |||
1114 | break; | |||
1115 | case OPT_end_group: | |||
1116 | if (!InputFile::IsInGroup) | |||
1117 | error("stray --end-group"); | |||
1118 | InputFile::IsInGroup = false; | |||
1119 | ++InputFile::NextGroupId; | |||
1120 | break; | |||
1121 | case OPT_start_lib: | |||
1122 | if (InLib) | |||
1123 | error("nested --start-lib"); | |||
1124 | if (InputFile::IsInGroup) | |||
1125 | error("may not nest --start-lib in --start-group"); | |||
1126 | InLib = true; | |||
1127 | InputFile::IsInGroup = true; | |||
1128 | break; | |||
1129 | case OPT_end_lib: | |||
1130 | if (!InLib) | |||
1131 | error("stray --end-lib"); | |||
1132 | InLib = false; | |||
1133 | InputFile::IsInGroup = false; | |||
1134 | ++InputFile::NextGroupId; | |||
1135 | break; | |||
1136 | case OPT_push_state: | |||
1137 | Stack.emplace_back(Config->AsNeeded, Config->Static, InWholeArchive); | |||
1138 | break; | |||
1139 | case OPT_pop_state: | |||
1140 | if (Stack.empty()) { | |||
1141 | error("unbalanced --push-state/--pop-state"); | |||
1142 | break; | |||
1143 | } | |||
1144 | std::tie(Config->AsNeeded, Config->Static, InWholeArchive) = Stack.back(); | |||
1145 | Stack.pop_back(); | |||
1146 | break; | |||
1147 | } | |||
1148 | } | |||
1149 | ||||
1150 | if (Files.empty() && errorCount() == 0) | |||
1151 | error("no input files"); | |||
1152 | } | |||
1153 | ||||
1154 | // If -m <machine_type> was not given, infer it from object files. | |||
1155 | void LinkerDriver::inferMachineType() { | |||
1156 | if (Config->EKind != ELFNoneKind) | |||
1157 | return; | |||
1158 | ||||
1159 | for (InputFile *F : Files) { | |||
1160 | if (F->EKind == ELFNoneKind) | |||
1161 | continue; | |||
1162 | Config->EKind = F->EKind; | |||
1163 | Config->EMachine = F->EMachine; | |||
1164 | Config->OSABI = F->OSABI; | |||
1165 | Config->MipsN32Abi = Config->EMachine == EM_MIPS && isMipsN32Abi(F); | |||
1166 | return; | |||
1167 | } | |||
1168 | error("target emulation unknown: -m or at least one .o file required"); | |||
1169 | } | |||
1170 | ||||
1171 | // Parse -z max-page-size=<value>. The default value is defined by | |||
1172 | // each target. | |||
1173 | static uint64_t getMaxPageSize(opt::InputArgList &Args) { | |||
1174 | uint64_t Val = args::getZOptionValue(Args, OPT_z, "max-page-size", | |||
1175 | Target->DefaultMaxPageSize); | |||
1176 | if (!isPowerOf2_64(Val)) | |||
1177 | error("max-page-size: value isn't a power of 2"); | |||
1178 | return Val; | |||
1179 | } | |||
1180 | ||||
1181 | // Parses -image-base option. | |||
1182 | static Optional<uint64_t> getImageBase(opt::InputArgList &Args) { | |||
1183 | // Because we are using "Config->MaxPageSize" here, this function has to be | |||
1184 | // called after the variable is initialized. | |||
1185 | auto *Arg = Args.getLastArg(OPT_image_base); | |||
1186 | if (!Arg) | |||
1187 | return None; | |||
1188 | ||||
1189 | StringRef S = Arg->getValue(); | |||
1190 | uint64_t V; | |||
1191 | if (!to_integer(S, V)) { | |||
1192 | error("-image-base: number expected, but got " + S); | |||
1193 | return 0; | |||
1194 | } | |||
1195 | if ((V % Config->MaxPageSize) != 0) | |||
1196 | warn("-image-base: address isn't multiple of page size: " + S); | |||
1197 | return V; | |||
1198 | } | |||
1199 | ||||
1200 | // Parses `--exclude-libs=lib,lib,...`. | |||
1201 | // The library names may be delimited by commas or colons. | |||
1202 | static DenseSet<StringRef> getExcludeLibs(opt::InputArgList &Args) { | |||
1203 | DenseSet<StringRef> Ret; | |||
1204 | for (auto *Arg : Args.filtered(OPT_exclude_libs)) { | |||
1205 | StringRef S = Arg->getValue(); | |||
1206 | for (;;) { | |||
1207 | size_t Pos = S.find_first_of(",:"); | |||
1208 | if (Pos == StringRef::npos) | |||
1209 | break; | |||
1210 | Ret.insert(S.substr(0, Pos)); | |||
1211 | S = S.substr(Pos + 1); | |||
1212 | } | |||
1213 | Ret.insert(S); | |||
1214 | } | |||
1215 | return Ret; | |||
1216 | } | |||
1217 | ||||
1218 | // Handles the -exclude-libs option. If a static library file is specified | |||
1219 | // by the -exclude-libs option, all public symbols from the archive become | |||
1220 | // private unless otherwise specified by version scripts or something. | |||
1221 | // A special library name "ALL" means all archive files. | |||
1222 | // | |||
1223 | // This is not a popular option, but some programs such as bionic libc use it. | |||
1224 | template <class ELFT> | |||
1225 | static void excludeLibs(opt::InputArgList &Args) { | |||
1226 | DenseSet<StringRef> Libs = getExcludeLibs(Args); | |||
1227 | bool All = Libs.count("ALL"); | |||
1228 | ||||
1229 | auto Visit = [&](InputFile *File) { | |||
1230 | if (!File->ArchiveName.empty()) | |||
1231 | if (All || Libs.count(path::filename(File->ArchiveName))) | |||
1232 | for (Symbol *Sym : File->getSymbols()) | |||
1233 | if (!Sym->isLocal() && Sym->File == File) | |||
1234 | Sym->VersionId = VER_NDX_LOCAL; | |||
1235 | }; | |||
1236 | ||||
1237 | for (InputFile *File : ObjectFiles) | |||
1238 | Visit(File); | |||
1239 | ||||
1240 | for (BitcodeFile *File : BitcodeFiles) | |||
1241 | Visit(File); | |||
1242 | } | |||
1243 | ||||
1244 | // Force Sym to be entered in the output. Used for -u or equivalent. | |||
1245 | template <class ELFT> static void handleUndefined(StringRef Name) { | |||
1246 | Symbol *Sym = Symtab->find(Name); | |||
1247 | if (!Sym) | |||
1248 | return; | |||
1249 | ||||
1250 | // Since symbol S may not be used inside the program, LTO may | |||
1251 | // eliminate it. Mark the symbol as "used" to prevent it. | |||
1252 | Sym->IsUsedInRegularObj = true; | |||
1253 | ||||
1254 | if (Sym->isLazy()) | |||
1255 | Symtab->fetchLazy<ELFT>(Sym); | |||
1256 | } | |||
1257 | ||||
1258 | template <class ELFT> static void handleLibcall(StringRef Name) { | |||
1259 | Symbol *Sym = Symtab->find(Name); | |||
1260 | if (!Sym || !Sym->isLazy()) | |||
1261 | return; | |||
1262 | ||||
1263 | MemoryBufferRef MB; | |||
1264 | if (auto *LO = dyn_cast<LazyObject>(Sym)) | |||
1265 | MB = LO->File->MB; | |||
1266 | else | |||
1267 | MB = cast<LazyArchive>(Sym)->getMemberBuffer(); | |||
1268 | ||||
1269 | if (isBitcode(MB)) | |||
1270 | Symtab->fetchLazy<ELFT>(Sym); | |||
1271 | } | |||
1272 | ||||
1273 | // If all references to a DSO happen to be weak, the DSO is not added | |||
1274 | // to DT_NEEDED. If that happens, we need to eliminate shared symbols | |||
1275 | // created from the DSO. Otherwise, they become dangling references | |||
1276 | // that point to a non-existent DSO. | |||
1277 | template <class ELFT> static void demoteSharedSymbols() { | |||
1278 | for (Symbol *Sym : Symtab->getSymbols()) { | |||
1279 | if (auto *S = dyn_cast<SharedSymbol>(Sym)) { | |||
1280 | if (!S->getFile<ELFT>().IsNeeded) { | |||
1281 | bool Used = S->Used; | |||
1282 | replaceSymbol<Undefined>(S, nullptr, S->getName(), STB_WEAK, S->StOther, | |||
1283 | S->Type); | |||
1284 | S->Used = Used; | |||
1285 | } | |||
1286 | } | |||
1287 | } | |||
1288 | } | |||
1289 | ||||
1290 | // The section referred to by S is considered address-significant. Set the | |||
1291 | // KeepUnique flag on the section if appropriate. | |||
1292 | static void markAddrsig(Symbol *S) { | |||
1293 | if (auto *D = dyn_cast_or_null<Defined>(S)) | |||
1294 | if (D->Section) | |||
1295 | // We don't need to keep text sections unique under --icf=all even if they | |||
1296 | // are address-significant. | |||
1297 | if (Config->ICF == ICFLevel::Safe || !(D->Section->Flags & SHF_EXECINSTR)) | |||
1298 | D->Section->KeepUnique = true; | |||
1299 | } | |||
1300 | ||||
1301 | // Record sections that define symbols mentioned in --keep-unique <symbol> | |||
1302 | // and symbols referred to by address-significance tables. These sections are | |||
1303 | // ineligible for ICF. | |||
1304 | template <class ELFT> | |||
1305 | static void findKeepUniqueSections(opt::InputArgList &Args) { | |||
1306 | for (auto *Arg : Args.filtered(OPT_keep_unique)) { | |||
1307 | StringRef Name = Arg->getValue(); | |||
1308 | auto *D = dyn_cast_or_null<Defined>(Symtab->find(Name)); | |||
1309 | if (!D || !D->Section) { | |||
1310 | warn("could not find symbol " + Name + " to keep unique"); | |||
1311 | continue; | |||
1312 | } | |||
1313 | D->Section->KeepUnique = true; | |||
1314 | } | |||
1315 | ||||
1316 | // --icf=all --ignore-data-address-equality means that we can ignore | |||
1317 | // the dynsym and address-significance tables entirely. | |||
1318 | if (Config->ICF == ICFLevel::All && Config->IgnoreDataAddressEquality) | |||
1319 | return; | |||
1320 | ||||
1321 | // Symbols in the dynsym could be address-significant in other executables | |||
1322 | // or DSOs, so we conservatively mark them as address-significant. | |||
1323 | for (Symbol *S : Symtab->getSymbols()) | |||
1324 | if (S->includeInDynsym()) | |||
1325 | markAddrsig(S); | |||
1326 | ||||
1327 | // Visit the address-significance table in each object file and mark each | |||
1328 | // referenced symbol as address-significant. | |||
1329 | for (InputFile *F : ObjectFiles) { | |||
1330 | auto *Obj = cast<ObjFile<ELFT>>(F); | |||
1331 | ArrayRef<Symbol *> Syms = Obj->getSymbols(); | |||
1332 | if (Obj->AddrsigSec) { | |||
1333 | ArrayRef<uint8_t> Contents = | |||
1334 | check(Obj->getObj().getSectionContents(Obj->AddrsigSec)); | |||
1335 | const uint8_t *Cur = Contents.begin(); | |||
1336 | while (Cur != Contents.end()) { | |||
1337 | unsigned Size; | |||
1338 | const char *Err; | |||
1339 | uint64_t SymIndex = decodeULEB128(Cur, &Size, Contents.end(), &Err); | |||
1340 | if (Err) | |||
1341 | fatal(toString(F) + ": could not decode addrsig section: " + Err); | |||
1342 | markAddrsig(Syms[SymIndex]); | |||
1343 | Cur += Size; | |||
1344 | } | |||
1345 | } else { | |||
1346 | // If an object file does not have an address-significance table, | |||
1347 | // conservatively mark all of its symbols as address-significant. | |||
1348 | for (Symbol *S : Syms) | |||
1349 | markAddrsig(S); | |||
1350 | } | |||
1351 | } | |||
1352 | } | |||
1353 | ||||
1354 | template <class ELFT> static Symbol *addUndefined(StringRef Name) { | |||
1355 | return Symtab->addUndefined<ELFT>(Name, STB_GLOBAL, STV_DEFAULT, 0, false, | |||
1356 | nullptr); | |||
1357 | } | |||
1358 | ||||
1359 | // The --wrap option is a feature to rename symbols so that you can write | |||
1360 | // wrappers for existing functions. If you pass `-wrap=foo`, all | |||
1361 | // occurrences of symbol `foo` are resolved to `wrap_foo` (so, you are | |||
1362 | // expected to write `wrap_foo` function as a wrapper). The original | |||
1363 | // symbol becomes accessible as `real_foo`, so you can call that from your | |||
1364 | // wrapper. | |||
1365 | // | |||
1366 | // This data structure is instantiated for each -wrap option. | |||
1367 | struct WrappedSymbol { | |||
1368 | Symbol *Sym; | |||
1369 | Symbol *Real; | |||
1370 | Symbol *Wrap; | |||
1371 | }; | |||
1372 | ||||
1373 | // Handles -wrap option. | |||
1374 | // | |||
1375 | // This function instantiates wrapper symbols. At this point, they seem | |||
1376 | // like they are not being used at all, so we explicitly set some flags so | |||
1377 | // that LTO won't eliminate them. | |||
1378 | template <class ELFT> | |||
1379 | static std::vector<WrappedSymbol> addWrappedSymbols(opt::InputArgList &Args) { | |||
1380 | std::vector<WrappedSymbol> V; | |||
1381 | DenseSet<StringRef> Seen; | |||
1382 | ||||
1383 | for (auto *Arg : Args.filtered(OPT_wrap)) { | |||
1384 | StringRef Name = Arg->getValue(); | |||
1385 | if (!Seen.insert(Name).second) | |||
1386 | continue; | |||
1387 | ||||
1388 | Symbol *Sym = Symtab->find(Name); | |||
1389 | if (!Sym) | |||
1390 | continue; | |||
1391 | ||||
1392 | Symbol *Real = addUndefined<ELFT>(Saver.save("__real_" + Name)); | |||
1393 | Symbol *Wrap = addUndefined<ELFT>(Saver.save("__wrap_" + Name)); | |||
1394 | V.push_back({Sym, Real, Wrap}); | |||
1395 | ||||
1396 | // We want to tell LTO not to inline symbols to be overwritten | |||
1397 | // because LTO doesn't know the final symbol contents after renaming. | |||
1398 | Real->CanInline = false; | |||
1399 | Sym->CanInline = false; | |||
1400 | ||||
1401 | // Tell LTO not to eliminate these symbols. | |||
1402 | Sym->IsUsedInRegularObj = true; | |||
1403 | Wrap->IsUsedInRegularObj = true; | |||
1404 | } | |||
1405 | return V; | |||
1406 | } | |||
1407 | ||||
1408 | // Do renaming for -wrap by updating pointers to symbols. | |||
1409 | // | |||
1410 | // When this function is executed, only InputFiles and symbol table | |||
1411 | // contain pointers to symbol objects. We visit them to replace pointers, | |||
1412 | // so that wrapped symbols are swapped as instructed by the command line. | |||
1413 | template <class ELFT> static void wrapSymbols(ArrayRef<WrappedSymbol> Wrapped) { | |||
1414 | DenseMap<Symbol *, Symbol *> Map; | |||
1415 | for (const WrappedSymbol &W : Wrapped) { | |||
1416 | Map[W.Sym] = W.Wrap; | |||
1417 | Map[W.Real] = W.Sym; | |||
1418 | } | |||
1419 | ||||
1420 | // Update pointers in input files. | |||
1421 | parallelForEach(ObjectFiles, [&](InputFile *File) { | |||
1422 | std::vector<Symbol *> &Syms = File->getMutableSymbols(); | |||
1423 | for (size_t I = 0, E = Syms.size(); I != E; ++I) | |||
1424 | if (Symbol *S = Map.lookup(Syms[I])) | |||
1425 | Syms[I] = S; | |||
1426 | }); | |||
1427 | ||||
1428 | // Update pointers in the symbol table. | |||
1429 | for (const WrappedSymbol &W : Wrapped) | |||
1430 | Symtab->wrap(W.Sym, W.Real, W.Wrap); | |||
1431 | } | |||
1432 | ||||
1433 | static const char *LibcallRoutineNames[] = { | |||
1434 | #define HANDLE_LIBCALL(code, name) name, | |||
1435 | #include "llvm/IR/RuntimeLibcalls.def" | |||
1436 | #undef HANDLE_LIBCALL | |||
1437 | }; | |||
1438 | ||||
1439 | // Do actual linking. Note that when this function is called, | |||
1440 | // all linker scripts have already been parsed. | |||
1441 | template <class ELFT> void LinkerDriver::link(opt::InputArgList &Args) { | |||
1442 | Target = getTarget(); | |||
1443 | InX<ELFT>::VerSym = nullptr; | |||
1444 | InX<ELFT>::VerNeed = nullptr; | |||
1445 | ||||
1446 | Config->MaxPageSize = getMaxPageSize(Args); | |||
1447 | Config->ImageBase = getImageBase(Args); | |||
1448 | ||||
1449 | // If a -hash-style option was not given, set to a default value, | |||
1450 | // which varies depending on the target. | |||
1451 | if (!Args.hasArg(OPT_hash_style)) { | |||
1452 | if (Config->EMachine == EM_MIPS) | |||
1453 | Config->SysvHash = true; | |||
1454 | else | |||
1455 | Config->SysvHash = Config->GnuHash = true; | |||
1456 | } | |||
1457 | ||||
1458 | // Default output filename is "a.out" by the Unix tradition. | |||
1459 | if (Config->OutputFile.empty()) | |||
1460 | Config->OutputFile = "a.out"; | |||
1461 | ||||
1462 | // Fail early if the output file or map file is not writable. If a user has a | |||
1463 | // long link, e.g. due to a large LTO link, they do not wish to run it and | |||
1464 | // find that it failed because there was a mistake in their command-line. | |||
1465 | if (auto E = tryCreateFile(Config->OutputFile)) | |||
1466 | error("cannot open output file " + Config->OutputFile + ": " + E.message()); | |||
1467 | if (auto E = tryCreateFile(Config->MapFile)) | |||
1468 | error("cannot open map file " + Config->MapFile + ": " + E.message()); | |||
1469 | if (errorCount()) | |||
1470 | return; | |||
1471 | ||||
1472 | // Use default entry point name if no name was given via the command | |||
1473 | // line nor linker scripts. For some reason, MIPS entry point name is | |||
1474 | // different from others. | |||
1475 | Config->WarnMissingEntry = | |||
1476 | (!Config->Entry.empty() || (!Config->Shared && !Config->Relocatable)); | |||
1477 | if (Config->Entry.empty() && !Config->Relocatable) | |||
1478 | Config->Entry = (Config->EMachine == EM_MIPS) ? "__start" : "_start"; | |||
1479 | ||||
1480 | // Handle --trace-symbol. | |||
1481 | for (auto *Arg : Args.filtered(OPT_trace_symbol)) | |||
1482 | Symtab->trace(Arg->getValue()); | |||
1483 | ||||
1484 | // Add all files to the symbol table. This will add almost all | |||
1485 | // symbols that we need to the symbol table. | |||
1486 | for (InputFile *F : Files) | |||
1487 | Symtab->addFile<ELFT>(F); | |||
1488 | ||||
1489 | // Now that we have every file, we can decide if we will need a | |||
1490 | // dynamic symbol table. | |||
1491 | // We need one if we were asked to export dynamic symbols or if we are | |||
1492 | // producing a shared library. | |||
1493 | // We also need one if any shared libraries are used and for pie executables | |||
1494 | // (probably because the dynamic linker needs it). | |||
1495 | Config->HasDynSymTab = | |||
1496 | !SharedFiles.empty() || Config->Pic || Config->ExportDynamic; | |||
1497 | ||||
1498 | // Some symbols (such as __ehdr_start) are defined lazily only when there | |||
1499 | // are undefined symbols for them, so we add these to trigger that logic. | |||
1500 | for (StringRef Name : Script->ReferencedSymbols) | |||
1501 | addUndefined<ELFT>(Name); | |||
1502 | ||||
1503 | // Handle the `--undefined <sym>` options. | |||
1504 | for (StringRef S : Config->Undefined) | |||
1505 | handleUndefined<ELFT>(S); | |||
1506 | ||||
1507 | // If an entry symbol is in a static archive, pull out that file now. | |||
1508 | handleUndefined<ELFT>(Config->Entry); | |||
1509 | ||||
1510 | // If any of our inputs are bitcode files, the LTO code generator may create | |||
1511 | // references to certain library functions that might not be explicit in the | |||
1512 | // bitcode file's symbol table. If any of those library functions are defined | |||
1513 | // in a bitcode file in an archive member, we need to arrange to use LTO to | |||
1514 | // compile those archive members by adding them to the link beforehand. | |||
1515 | // | |||
1516 | // However, adding all libcall symbols to the link can have undesired | |||
1517 | // consequences. For example, the libgcc implementation of | |||
1518 | // __sync_val_compare_and_swap_8 on 32-bit ARM pulls in an .init_array entry | |||
1519 | // that aborts the program if the Linux kernel does not support 64-bit | |||
1520 | // atomics, which would prevent the program from running even if it does not | |||
1521 | // use 64-bit atomics. | |||
1522 | // | |||
1523 | // Therefore, we only add libcall symbols to the link before LTO if we have | |||
1524 | // to, i.e. if the symbol's definition is in bitcode. Any other required | |||
1525 | // libcall symbols will be added to the link after LTO when we add the LTO | |||
1526 | // object file to the link. | |||
1527 | if (!BitcodeFiles.empty()) | |||
1528 | for (const char *S : LibcallRoutineNames) | |||
1529 | handleLibcall<ELFT>(S); | |||
1530 | ||||
1531 | // Return if there were name resolution errors. | |||
1532 | if (errorCount()) | |||
1533 | return; | |||
1534 | ||||
1535 | // Now when we read all script files, we want to finalize order of linker | |||
1536 | // script commands, which can be not yet final because of INSERT commands. | |||
1537 | Script->processInsertCommands(); | |||
1538 | ||||
1539 | // We want to declare linker script's symbols early, | |||
1540 | // so that we can version them. | |||
1541 | // They also might be exported if referenced by DSOs. | |||
1542 | Script->declareSymbols(); | |||
1543 | ||||
1544 | // Handle the -exclude-libs option. | |||
1545 | if (Args.hasArg(OPT_exclude_libs)) | |||
1546 | excludeLibs<ELFT>(Args); | |||
1547 | ||||
1548 | // Create ElfHeader early. We need a dummy section in | |||
1549 | // addReservedSymbols to mark the created symbols as not absolute. | |||
1550 | Out::ElfHeader = make<OutputSection>("", 0, SHF_ALLOC); | |||
1551 | Out::ElfHeader->Size = sizeof(typename ELFT::Ehdr); | |||
1552 | ||||
1553 | // We need to create some reserved symbols such as _end. Create them. | |||
1554 | if (!Config->Relocatable) | |||
1555 | addReservedSymbols(); | |||
1556 | ||||
1557 | // Apply version scripts. | |||
1558 | // | |||
1559 | // For a relocatable output, version scripts don't make sense, and | |||
1560 | // parsing a symbol version string (e.g. dropping "@ver1" from a symbol | |||
1561 | // name "foo@ver1") rather do harm, so we don't call this if -r is given. | |||
1562 | if (!Config->Relocatable) | |||
1563 | Symtab->scanVersionScript(); | |||
1564 | ||||
1565 | // Create wrapped symbols for -wrap option. | |||
1566 | std::vector<WrappedSymbol> Wrapped = addWrappedSymbols<ELFT>(Args); | |||
1567 | ||||
1568 | // Do link-time optimization if given files are LLVM bitcode files. | |||
1569 | // This compiles bitcode files into real object files. | |||
1570 | // | |||
1571 | // With this the symbol table should be complete. After this, no new names | |||
1572 | // except a few linker-synthesized ones will be added to the symbol table. | |||
1573 | Symtab->addCombinedLTOObject<ELFT>(); | |||
1574 | if (errorCount()) | |||
1575 | return; | |||
1576 | ||||
1577 | // If -thinlto-index-only is given, we should create only "index | |||
1578 | // files" and not object files. Index file creation is already done | |||
1579 | // in addCombinedLTOObject, so we are done if that's the case. | |||
1580 | if (Config->ThinLTOIndexOnly) | |||
1581 | return; | |||
1582 | ||||
1583 | // Apply symbol renames for -wrap. | |||
1584 | if (!Wrapped.empty()) | |||
1585 | wrapSymbols<ELFT>(Wrapped); | |||
1586 | ||||
1587 | // Now that we have a complete list of input files. | |||
1588 | // Beyond this point, no new files are added. | |||
1589 | // Aggregate all input sections into one place. | |||
1590 | for (InputFile *F : ObjectFiles) | |||
1591 | for (InputSectionBase *S : F->getSections()) | |||
1592 | if (S && S != &InputSection::Discarded) | |||
1593 | InputSections.push_back(S); | |||
1594 | for (BinaryFile *F : BinaryFiles) | |||
1595 | for (InputSectionBase *S : F->getSections()) | |||
1596 | InputSections.push_back(cast<InputSection>(S)); | |||
1597 | ||||
1598 | // We do not want to emit debug sections if --strip-all | |||
1599 | // or -strip-debug are given. | |||
1600 | if (Config->Strip != StripPolicy::None) | |||
1601 | llvm::erase_if(InputSections, [](InputSectionBase *S) { | |||
1602 | return S->Name.startswith(".debug") || S->Name.startswith(".zdebug"); | |||
1603 | }); | |||
1604 | ||||
1605 | Config->EFlags = Target->calcEFlags(); | |||
1606 | ||||
1607 | if (Config->EMachine == EM_ARM) { | |||
1608 | // FIXME: These warnings can be removed when lld only uses these features | |||
1609 | // when the input objects have been compiled with an architecture that | |||
1610 | // supports them. | |||
1611 | if (Config->ARMHasBlx == false) | |||
1612 | warn("lld uses blx instruction, no object with architecture supporting " | |||
1613 | "feature detected"); | |||
1614 | } | |||
1615 | ||||
1616 | // This adds a .comment section containing a version string. We have to add it | |||
1617 | // before mergeSections because the .comment section is a mergeable section. | |||
1618 | if (!Config->Relocatable) | |||
1619 | InputSections.push_back(createCommentSection()); | |||
1620 | ||||
1621 | // Do size optimizations: garbage collection, merging of SHF_MERGE sections | |||
1622 | // and identical code folding. | |||
1623 | splitSections<ELFT>(); | |||
1624 | markLive<ELFT>(); | |||
1625 | demoteSharedSymbols<ELFT>(); | |||
1626 | mergeSections(); | |||
1627 | if (Config->ICF != ICFLevel::None) { | |||
1628 | findKeepUniqueSections<ELFT>(Args); | |||
1629 | doIcf<ELFT>(); | |||
1630 | } | |||
1631 | ||||
1632 | // Read the callgraph now that we know what was gced or icfed | |||
1633 | if (Config->CallGraphProfileSort) { | |||
1634 | if (auto *Arg = Args.getLastArg(OPT_call_graph_ordering_file)) | |||
1635 | if (Optional<MemoryBufferRef> Buffer = readFile(Arg->getValue())) | |||
1636 | readCallGraph(*Buffer); | |||
1637 | readCallGraphsFromObjectFiles<ELFT>(); | |||
1638 | } | |||
1639 | ||||
1640 | // Write the result to the file. | |||
1641 | writeResult<ELFT>(); | |||
1642 | } |
1 | //===- InputFiles.h ---------------------------------------------*- C++ -*-===// |
2 | // |
3 | // The LLVM Linker |
4 | // |
5 | // This file is distributed under the University of Illinois Open Source |
6 | // License. See LICENSE.TXT for details. |
7 | // |
8 | //===----------------------------------------------------------------------===// |
9 | |
10 | #ifndef LLD_ELF_INPUT_FILES_H |
11 | #define LLD_ELF_INPUT_FILES_H |
12 | |
13 | #include "Config.h" |
14 | #include "lld/Common/ErrorHandler.h" |
15 | #include "lld/Common/LLVM.h" |
16 | #include "lld/Common/Reproduce.h" |
17 | #include "llvm/ADT/CachedHashString.h" |
18 | #include "llvm/ADT/DenseSet.h" |
19 | #include "llvm/ADT/STLExtras.h" |
20 | #include "llvm/DebugInfo/DWARF/DWARFDebugLine.h" |
21 | #include "llvm/IR/Comdat.h" |
22 | #include "llvm/Object/Archive.h" |
23 | #include "llvm/Object/ELF.h" |
24 | #include "llvm/Object/IRObjectFile.h" |
25 | #include "llvm/Support/Threading.h" |
26 | #include <map> |
27 | |
28 | namespace llvm { |
29 | class TarWriter; |
30 | struct DILineInfo; |
31 | namespace lto { |
32 | class InputFile; |
33 | } |
34 | } // namespace llvm |
35 | |
36 | namespace lld { |
37 | namespace elf { |
38 | class InputFile; |
39 | class InputSectionBase; |
40 | } |
41 | |
42 | // Returns "<internal>", "foo.a(bar.o)" or "baz.o". |
43 | std::string toString(const elf::InputFile *F); |
44 | |
45 | namespace elf { |
46 | |
47 | using llvm::object::Archive; |
48 | |
49 | class Symbol; |
50 | |
51 | // If -reproduce option is given, all input files are written |
52 | // to this tar archive. |
53 | extern llvm::TarWriter *Tar; |
54 | |
55 | // Opens a given file. |
56 | llvm::Optional<MemoryBufferRef> readFile(StringRef Path); |
57 | |
58 | // The root class of input files. |
59 | class InputFile { |
60 | public: |
61 | enum Kind { |
62 | ObjKind, |
63 | SharedKind, |
64 | LazyObjKind, |
65 | ArchiveKind, |
66 | BitcodeKind, |
67 | BinaryKind, |
68 | }; |
69 | |
70 | Kind kind() const { return FileKind; } |
71 | |
72 | bool isElf() const { |
73 | Kind K = kind(); |
74 | return K == ObjKind || K == SharedKind; |
75 | } |
76 | |
77 | StringRef getName() const { return MB.getBufferIdentifier(); } |
78 | MemoryBufferRef MB; |
79 | |
80 | // Returns sections. It is a runtime error to call this function |
81 | // on files that don't have the notion of sections. |
82 | ArrayRef<InputSectionBase *> getSections() const { |
83 | assert(FileKind == ObjKind || FileKind == BinaryKind)((FileKind == ObjKind || FileKind == BinaryKind) ? static_cast <void> (0) : __assert_fail ("FileKind == ObjKind || FileKind == BinaryKind" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lld/ELF/InputFiles.h" , 83, __PRETTY_FUNCTION__)); |
84 | return Sections; |
85 | } |
86 | |
87 | // Returns object file symbols. It is a runtime error to call this |
88 | // function on files of other types. |
89 | ArrayRef<Symbol *> getSymbols() { return getMutableSymbols(); } |
90 | |
91 | std::vector<Symbol *> &getMutableSymbols() { |
92 | assert(FileKind == BinaryKind || FileKind == ObjKind ||((FileKind == BinaryKind || FileKind == ObjKind || FileKind == BitcodeKind) ? static_cast<void> (0) : __assert_fail ( "FileKind == BinaryKind || FileKind == ObjKind || FileKind == BitcodeKind" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lld/ELF/InputFiles.h" , 93, __PRETTY_FUNCTION__)) |
93 | FileKind == BitcodeKind)((FileKind == BinaryKind || FileKind == ObjKind || FileKind == BitcodeKind) ? static_cast<void> (0) : __assert_fail ( "FileKind == BinaryKind || FileKind == ObjKind || FileKind == BitcodeKind" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lld/ELF/InputFiles.h" , 93, __PRETTY_FUNCTION__)); |
94 | return Symbols; |
95 | } |
96 | |
97 | // Filename of .a which contained this file. If this file was |
98 | // not in an archive file, it is the empty string. We use this |
99 | // string for creating error messages. |
100 | std::string ArchiveName; |
101 | |
102 | // If this is an architecture-specific file, the following members |
103 | // have ELF type (i.e. ELF{32,64}{LE,BE}) and target machine type. |
104 | ELFKind EKind = ELFNoneKind; |
105 | uint16_t EMachine = llvm::ELF::EM_NONE; |
106 | uint8_t OSABI = 0; |
107 | |
108 | // Cache for toString(). Only toString() should use this member. |
109 | mutable std::string ToStringCache; |
110 | |
111 | std::string getSrcMsg(const Symbol &Sym, InputSectionBase &Sec, |
112 | uint64_t Offset); |
113 | |
114 | // True if this is an argument for --just-symbols. Usually false. |
115 | bool JustSymbols = false; |
116 | |
117 | // GroupId is used for --warn-backrefs which is an optional error |
118 | // checking feature. All files within the same --{start,end}-group or |
119 | // --{start,end}-lib get the same group ID. Otherwise, each file gets a new |
120 | // group ID. For more info, see checkDependency() in SymbolTable.cpp. |
121 | uint32_t GroupId; |
122 | static bool IsInGroup; |
123 | static uint32_t NextGroupId; |
124 | |
125 | // Index of MIPS GOT built for this file. |
126 | llvm::Optional<size_t> MipsGotIndex; |
127 | |
128 | protected: |
129 | InputFile(Kind K, MemoryBufferRef M); |
130 | std::vector<InputSectionBase *> Sections; |
131 | std::vector<Symbol *> Symbols; |
132 | |
133 | private: |
134 | const Kind FileKind; |
135 | }; |
136 | |
137 | template <typename ELFT> class ELFFileBase : public InputFile { |
138 | public: |
139 | typedef typename ELFT::Shdr Elf_Shdr; |
140 | typedef typename ELFT::Sym Elf_Sym; |
141 | typedef typename ELFT::Word Elf_Word; |
142 | typedef typename ELFT::SymRange Elf_Sym_Range; |
143 | |
144 | ELFFileBase(Kind K, MemoryBufferRef M); |
145 | static bool classof(const InputFile *F) { return F->isElf(); } |
146 | |
147 | llvm::object::ELFFile<ELFT> getObj() const { |
148 | return check(llvm::object::ELFFile<ELFT>::create(MB.getBuffer())); |
149 | } |
150 | |
151 | StringRef getStringTable() const { return StringTable; } |
152 | |
153 | uint32_t getSectionIndex(const Elf_Sym &Sym) const; |
154 | |
155 | Elf_Sym_Range getGlobalELFSyms(); |
156 | Elf_Sym_Range getELFSyms() const { return ELFSyms; } |
157 | |
158 | protected: |
159 | ArrayRef<Elf_Sym> ELFSyms; |
160 | uint32_t FirstGlobal = 0; |
161 | ArrayRef<Elf_Word> SymtabSHNDX; |
162 | StringRef StringTable; |
163 | void initSymtab(ArrayRef<Elf_Shdr> Sections, const Elf_Shdr *Symtab); |
164 | }; |
165 | |
166 | // .o file. |
167 | template <class ELFT> class ObjFile : public ELFFileBase<ELFT> { |
168 | typedef ELFFileBase<ELFT> Base; |
169 | typedef typename ELFT::Rel Elf_Rel; |
170 | typedef typename ELFT::Rela Elf_Rela; |
171 | typedef typename ELFT::Sym Elf_Sym; |
172 | typedef typename ELFT::Shdr Elf_Shdr; |
173 | typedef typename ELFT::Word Elf_Word; |
174 | typedef typename ELFT::CGProfile Elf_CGProfile; |
175 | |
176 | StringRef getShtGroupSignature(ArrayRef<Elf_Shdr> Sections, |
177 | const Elf_Shdr &Sec); |
178 | ArrayRef<Elf_Word> getShtGroupEntries(const Elf_Shdr &Sec); |
179 | |
180 | public: |
181 | static bool classof(const InputFile *F) { return F->kind() == Base::ObjKind; } |
182 | |
183 | ArrayRef<Symbol *> getLocalSymbols(); |
184 | ArrayRef<Symbol *> getGlobalSymbols(); |
185 | |
186 | ObjFile(MemoryBufferRef M, StringRef ArchiveName); |
187 | void parse(llvm::DenseSet<llvm::CachedHashStringRef> &ComdatGroups); |
188 | |
189 | Symbol &getSymbol(uint32_t SymbolIndex) const { |
190 | if (SymbolIndex >= this->Symbols.size()) |
191 | fatal(toString(this) + ": invalid symbol index"); |
192 | return *this->Symbols[SymbolIndex]; |
193 | } |
194 | |
195 | template <typename RelT> Symbol &getRelocTargetSym(const RelT &Rel) const { |
196 | uint32_t SymIndex = Rel.getSymbol(Config->IsMips64EL); |
197 | return getSymbol(SymIndex); |
198 | } |
199 | |
200 | llvm::Optional<llvm::DILineInfo> getDILineInfo(InputSectionBase *, uint64_t); |
201 | llvm::Optional<std::pair<std::string, unsigned>> getVariableLoc(StringRef Name); |
202 | |
203 | // MIPS GP0 value defined by this file. This value represents the gp value |
204 | // used to create the relocatable object and required to support |
205 | // R_MIPS_GPREL16 / R_MIPS_GPREL32 relocations. |
206 | uint32_t MipsGp0 = 0; |
207 | |
208 | // Name of source file obtained from STT_FILE symbol value, |
209 | // or empty string if there is no such symbol in object file |
210 | // symbol table. |
211 | StringRef SourceFile; |
212 | |
213 | // True if the file defines functions compiled with |
214 | // -fsplit-stack. Usually false. |
215 | bool SplitStack = false; |
216 | |
217 | // True if the file defines functions compiled with -fsplit-stack, |
218 | // but had one or more functions with the no_split_stack attribute. |
219 | bool SomeNoSplitStack = false; |
220 | |
221 | // Pointer to this input file's .llvm_addrsig section, if it has one. |
222 | const Elf_Shdr *AddrsigSec = nullptr; |
223 | |
224 | // SHT_LLVM_CALL_GRAPH_PROFILE table |
225 | ArrayRef<Elf_CGProfile> CGProfile; |
226 | |
227 | private: |
228 | void |
229 | initializeSections(llvm::DenseSet<llvm::CachedHashStringRef> &ComdatGroups); |
230 | void initializeSymbols(); |
231 | void initializeJustSymbols(); |
232 | void initializeDwarf(); |
233 | InputSectionBase *getRelocTarget(const Elf_Shdr &Sec); |
234 | InputSectionBase *createInputSection(const Elf_Shdr &Sec); |
235 | StringRef getSectionName(const Elf_Shdr &Sec); |
236 | |
237 | bool shouldMerge(const Elf_Shdr &Sec); |
238 | Symbol *createSymbol(const Elf_Sym *Sym); |
239 | |
240 | // .shstrtab contents. |
241 | StringRef SectionStringTable; |
242 | |
243 | // Debugging information to retrieve source file and line for error |
244 | // reporting. Linker may find reasonable number of errors in a |
245 | // single object file, so we cache debugging information in order to |
246 | // parse it only once for each object file we link. |
247 | std::unique_ptr<llvm::DWARFContext> Dwarf; |
248 | std::vector<const llvm::DWARFDebugLine::LineTable *> LineTables; |
249 | struct VarLoc { |
250 | const llvm::DWARFDebugLine::LineTable *LT; |
251 | unsigned File; |
252 | unsigned Line; |
253 | }; |
254 | llvm::DenseMap<StringRef, VarLoc> VariableLoc; |
255 | llvm::once_flag InitDwarfLine; |
256 | }; |
257 | |
258 | // LazyObjFile is analogous to ArchiveFile in the sense that |
259 | // the file contains lazy symbols. The difference is that |
260 | // LazyObjFile wraps a single file instead of multiple files. |
261 | // |
262 | // This class is used for --start-lib and --end-lib options which |
263 | // instruct the linker to link object files between them with the |
264 | // archive file semantics. |
265 | class LazyObjFile : public InputFile { |
266 | public: |
267 | LazyObjFile(MemoryBufferRef M, StringRef ArchiveName, |
268 | uint64_t OffsetInArchive) |
269 | : InputFile(LazyObjKind, M), OffsetInArchive(OffsetInArchive) { |
270 | this->ArchiveName = ArchiveName; |
271 | } |
272 | |
273 | static bool classof(const InputFile *F) { return F->kind() == LazyObjKind; } |
274 | |
275 | template <class ELFT> void parse(); |
276 | MemoryBufferRef getBuffer(); |
277 | InputFile *fetch(); |
278 | bool AddedToLink = false; |
279 | |
280 | private: |
281 | uint64_t OffsetInArchive; |
282 | }; |
283 | |
284 | // An ArchiveFile object represents a .a file. |
285 | class ArchiveFile : public InputFile { |
286 | public: |
287 | explicit ArchiveFile(std::unique_ptr<Archive> &&File); |
288 | static bool classof(const InputFile *F) { return F->kind() == ArchiveKind; } |
289 | template <class ELFT> void parse(); |
290 | |
291 | // Pulls out an object file that contains a definition for Sym and |
292 | // returns it. If the same file was instantiated before, this |
293 | // function returns a nullptr (so we don't instantiate the same file |
294 | // more than once.) |
295 | InputFile *fetch(const Archive::Symbol &Sym); |
296 | |
297 | private: |
298 | std::unique_ptr<Archive> File; |
299 | llvm::DenseSet<uint64_t> Seen; |
300 | }; |
301 | |
302 | class BitcodeFile : public InputFile { |
303 | public: |
304 | BitcodeFile(MemoryBufferRef M, StringRef ArchiveName, |
305 | uint64_t OffsetInArchive); |
306 | static bool classof(const InputFile *F) { return F->kind() == BitcodeKind; } |
307 | template <class ELFT> |
308 | void parse(llvm::DenseSet<llvm::CachedHashStringRef> &ComdatGroups); |
309 | std::unique_ptr<llvm::lto::InputFile> Obj; |
310 | }; |
311 | |
312 | // .so file. |
313 | template <class ELFT> class SharedFile : public ELFFileBase<ELFT> { |
314 | typedef ELFFileBase<ELFT> Base; |
315 | typedef typename ELFT::Dyn Elf_Dyn; |
316 | typedef typename ELFT::Shdr Elf_Shdr; |
317 | typedef typename ELFT::Sym Elf_Sym; |
318 | typedef typename ELFT::SymRange Elf_Sym_Range; |
319 | typedef typename ELFT::Verdef Elf_Verdef; |
320 | typedef typename ELFT::Versym Elf_Versym; |
321 | |
322 | const Elf_Shdr *VersymSec = nullptr; |
323 | const Elf_Shdr *VerdefSec = nullptr; |
324 | |
325 | public: |
326 | std::vector<const Elf_Verdef *> Verdefs; |
327 | std::string SoName; |
328 | |
329 | static bool classof(const InputFile *F) { |
330 | return F->kind() == Base::SharedKind; |
331 | } |
332 | |
333 | SharedFile(MemoryBufferRef M, StringRef DefaultSoName); |
334 | |
335 | void parseSoName(); |
336 | void parseRest(); |
337 | uint32_t getAlignment(ArrayRef<Elf_Shdr> Sections, const Elf_Sym &Sym); |
338 | std::vector<const Elf_Verdef *> parseVerdefs(); |
339 | std::vector<uint32_t> parseVersyms(); |
340 | |
341 | struct NeededVer { |
342 | // The string table offset of the version name in the output file. |
343 | size_t StrTab; |
344 | |
345 | // The version identifier for this version name. |
346 | uint16_t Index; |
347 | }; |
348 | |
349 | // Mapping from Elf_Verdef data structures to information about Elf_Vernaux |
350 | // data structures in the output file. |
351 | std::map<const Elf_Verdef *, NeededVer> VerdefMap; |
352 | |
353 | // Used for --as-needed |
354 | bool IsNeeded; |
355 | }; |
356 | |
357 | class BinaryFile : public InputFile { |
358 | public: |
359 | explicit BinaryFile(MemoryBufferRef M) : InputFile(BinaryKind, M) {} |
360 | static bool classof(const InputFile *F) { return F->kind() == BinaryKind; } |
361 | void parse(); |
362 | }; |
363 | |
364 | InputFile *createObjectFile(MemoryBufferRef MB, StringRef ArchiveName = "", |
365 | uint64_t OffsetInArchive = 0); |
366 | InputFile *createSharedFile(MemoryBufferRef MB, StringRef DefaultSoName); |
367 | |
368 | inline bool isBitcode(MemoryBufferRef MB) { |
369 | return identify_magic(MB.getBuffer()) == llvm::file_magic::bitcode; |
370 | } |
371 | |
372 | std::string replaceThinLTOSuffix(StringRef Path); |
373 | |
374 | extern std::vector<BinaryFile *> BinaryFiles; |
375 | extern std::vector<BitcodeFile *> BitcodeFiles; |
376 | extern std::vector<LazyObjFile *> LazyObjFiles; |
377 | extern std::vector<InputFile *> ObjectFiles; |
378 | extern std::vector<InputFile *> SharedFiles; |
379 | |
380 | } // namespace elf |
381 | } // namespace lld |
382 | |
383 | #endif |
1 | //===- ELF.h - ELF object file implementation -------------------*- C++ -*-===// |
2 | // |
3 | // The LLVM Compiler Infrastructure |
4 | // |
5 | // This file is distributed under the University of Illinois Open Source |
6 | // License. See LICENSE.TXT for details. |
7 | // |
8 | //===----------------------------------------------------------------------===// |
9 | // |
10 | // This file declares the ELFFile template class. |
11 | // |
12 | //===----------------------------------------------------------------------===// |
13 | |
14 | #ifndef LLVM_OBJECT_ELF_H |
15 | #define LLVM_OBJECT_ELF_H |
16 | |
17 | #include "llvm/ADT/ArrayRef.h" |
18 | #include "llvm/ADT/SmallVector.h" |
19 | #include "llvm/ADT/StringRef.h" |
20 | #include "llvm/BinaryFormat/ELF.h" |
21 | #include "llvm/Object/ELFTypes.h" |
22 | #include "llvm/Object/Error.h" |
23 | #include "llvm/Support/Endian.h" |
24 | #include "llvm/Support/Error.h" |
25 | #include <cassert> |
26 | #include <cstddef> |
27 | #include <cstdint> |
28 | #include <limits> |
29 | #include <utility> |
30 | |
31 | namespace llvm { |
32 | namespace object { |
33 | |
34 | StringRef getELFRelocationTypeName(uint32_t Machine, uint32_t Type); |
35 | uint32_t getELFRelrRelocationType(uint32_t Machine); |
36 | StringRef getELFSectionTypeName(uint32_t Machine, uint32_t Type); |
37 | |
38 | // Subclasses of ELFFile may need this for template instantiation |
39 | inline std::pair<unsigned char, unsigned char> |
40 | getElfArchType(StringRef Object) { |
41 | if (Object.size() < ELF::EI_NIDENT) |
42 | return std::make_pair((uint8_t)ELF::ELFCLASSNONE, |
43 | (uint8_t)ELF::ELFDATANONE); |
44 | return std::make_pair((uint8_t)Object[ELF::EI_CLASS], |
45 | (uint8_t)Object[ELF::EI_DATA]); |
46 | } |
47 | |
48 | static inline Error createError(StringRef Err) { |
49 | return make_error<StringError>(Err, object_error::parse_failed); |
50 | } |
51 | |
52 | template <class ELFT> |
53 | class ELFFile { |
54 | public: |
55 | LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)using Elf_Addr = typename ELFT::Addr; using Elf_Off = typename ELFT::Off; using Elf_Half = typename ELFT::Half; using Elf_Word = typename ELFT::Word; using Elf_Sword = typename ELFT::Sword ; using Elf_Xword = typename ELFT::Xword; using Elf_Sxword = typename ELFT::Sxword; |
56 | using uintX_t = typename ELFT::uint; |
57 | using Elf_Ehdr = typename ELFT::Ehdr; |
58 | using Elf_Shdr = typename ELFT::Shdr; |
59 | using Elf_Sym = typename ELFT::Sym; |
60 | using Elf_Dyn = typename ELFT::Dyn; |
61 | using Elf_Phdr = typename ELFT::Phdr; |
62 | using Elf_Rel = typename ELFT::Rel; |
63 | using Elf_Rela = typename ELFT::Rela; |
64 | using Elf_Relr = typename ELFT::Relr; |
65 | using Elf_Verdef = typename ELFT::Verdef; |
66 | using Elf_Verdaux = typename ELFT::Verdaux; |
67 | using Elf_Verneed = typename ELFT::Verneed; |
68 | using Elf_Vernaux = typename ELFT::Vernaux; |
69 | using Elf_Versym = typename ELFT::Versym; |
70 | using Elf_Hash = typename ELFT::Hash; |
71 | using Elf_GnuHash = typename ELFT::GnuHash; |
72 | using Elf_Nhdr = typename ELFT::Nhdr; |
73 | using Elf_Note = typename ELFT::Note; |
74 | using Elf_Note_Iterator = typename ELFT::NoteIterator; |
75 | using Elf_Dyn_Range = typename ELFT::DynRange; |
76 | using Elf_Shdr_Range = typename ELFT::ShdrRange; |
77 | using Elf_Sym_Range = typename ELFT::SymRange; |
78 | using Elf_Rel_Range = typename ELFT::RelRange; |
79 | using Elf_Rela_Range = typename ELFT::RelaRange; |
80 | using Elf_Relr_Range = typename ELFT::RelrRange; |
81 | using Elf_Phdr_Range = typename ELFT::PhdrRange; |
82 | |
83 | const uint8_t *base() const { |
84 | return reinterpret_cast<const uint8_t *>(Buf.data()); |
85 | } |
86 | |
87 | size_t getBufSize() const { return Buf.size(); } |
88 | |
89 | private: |
90 | StringRef Buf; |
91 | |
92 | ELFFile(StringRef Object); |
93 | |
94 | public: |
95 | const Elf_Ehdr *getHeader() const { |
96 | return reinterpret_cast<const Elf_Ehdr *>(base()); |
97 | } |
98 | |
99 | template <typename T> |
100 | Expected<const T *> getEntry(uint32_t Section, uint32_t Entry) const; |
101 | template <typename T> |
102 | Expected<const T *> getEntry(const Elf_Shdr *Section, uint32_t Entry) const; |
103 | |
104 | Expected<StringRef> getStringTable(const Elf_Shdr *Section) const; |
105 | Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const; |
106 | Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section, |
107 | Elf_Shdr_Range Sections) const; |
108 | |
109 | Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section) const; |
110 | Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section, |
111 | Elf_Shdr_Range Sections) const; |
112 | |
113 | StringRef getRelocationTypeName(uint32_t Type) const; |
114 | void getRelocationTypeName(uint32_t Type, |
115 | SmallVectorImpl<char> &Result) const; |
116 | uint32_t getRelrRelocationType() const; |
117 | |
118 | const char *getDynamicTagAsString(unsigned Arch, uint64_t Type) const; |
119 | const char *getDynamicTagAsString(uint64_t Type) const; |
120 | |
121 | /// Get the symbol for a given relocation. |
122 | Expected<const Elf_Sym *> getRelocationSymbol(const Elf_Rel *Rel, |
123 | const Elf_Shdr *SymTab) const; |
124 | |
125 | static Expected<ELFFile> create(StringRef Object); |
126 | |
127 | bool isMipsELF64() const { |
128 | return getHeader()->e_machine == ELF::EM_MIPS && |
129 | getHeader()->getFileClass() == ELF::ELFCLASS64; |
130 | } |
131 | |
132 | bool isMips64EL() const { |
133 | return isMipsELF64() && |
134 | getHeader()->getDataEncoding() == ELF::ELFDATA2LSB; |
135 | } |
136 | |
137 | Expected<Elf_Shdr_Range> sections() const; |
138 | |
139 | Expected<Elf_Dyn_Range> dynamicEntries() const; |
140 | |
141 | Expected<const uint8_t *> toMappedAddr(uint64_t VAddr) const; |
142 | |
143 | Expected<Elf_Sym_Range> symbols(const Elf_Shdr *Sec) const { |
144 | if (!Sec) |
145 | return makeArrayRef<Elf_Sym>(nullptr, nullptr); |
146 | return getSectionContentsAsArray<Elf_Sym>(Sec); |
147 | } |
148 | |
149 | Expected<Elf_Rela_Range> relas(const Elf_Shdr *Sec) const { |
150 | return getSectionContentsAsArray<Elf_Rela>(Sec); |
151 | } |
152 | |
153 | Expected<Elf_Rel_Range> rels(const Elf_Shdr *Sec) const { |
154 | return getSectionContentsAsArray<Elf_Rel>(Sec); |
155 | } |
156 | |
157 | Expected<Elf_Relr_Range> relrs(const Elf_Shdr *Sec) const { |
158 | return getSectionContentsAsArray<Elf_Relr>(Sec); |
159 | } |
160 | |
161 | Expected<std::vector<Elf_Rela>> decode_relrs(Elf_Relr_Range relrs) const; |
162 | |
163 | Expected<std::vector<Elf_Rela>> android_relas(const Elf_Shdr *Sec) const; |
164 | |
165 | /// Iterate over program header table. |
166 | Expected<Elf_Phdr_Range> program_headers() const { |
167 | if (getHeader()->e_phnum && getHeader()->e_phentsize != sizeof(Elf_Phdr)) |
168 | return createError("invalid e_phentsize"); |
169 | if (getHeader()->e_phoff + |
170 | (getHeader()->e_phnum * getHeader()->e_phentsize) > |
171 | getBufSize()) |
172 | return createError("program headers longer than binary"); |
173 | auto *Begin = |
174 | reinterpret_cast<const Elf_Phdr *>(base() + getHeader()->e_phoff); |
175 | return makeArrayRef(Begin, Begin + getHeader()->e_phnum); |
176 | } |
177 | |
178 | /// Get an iterator over notes in a program header. |
179 | /// |
180 | /// The program header must be of type \c PT_NOTE. |
181 | /// |
182 | /// \param Phdr the program header to iterate over. |
183 | /// \param Err [out] an error to support fallible iteration, which should |
184 | /// be checked after iteration ends. |
185 | Elf_Note_Iterator notes_begin(const Elf_Phdr &Phdr, Error &Err) const { |
186 | if (Phdr.p_type != ELF::PT_NOTE) { |
187 | Err = createError("attempt to iterate notes of non-note program header"); |
188 | return Elf_Note_Iterator(Err); |
189 | } |
190 | if (Phdr.p_offset + Phdr.p_filesz > getBufSize()) { |
191 | Err = createError("invalid program header offset/size"); |
192 | return Elf_Note_Iterator(Err); |
193 | } |
194 | return Elf_Note_Iterator(base() + Phdr.p_offset, Phdr.p_filesz, Err); |
195 | } |
196 | |
197 | /// Get an iterator over notes in a section. |
198 | /// |
199 | /// The section must be of type \c SHT_NOTE. |
200 | /// |
201 | /// \param Shdr the section to iterate over. |
202 | /// \param Err [out] an error to support fallible iteration, which should |
203 | /// be checked after iteration ends. |
204 | Elf_Note_Iterator notes_begin(const Elf_Shdr &Shdr, Error &Err) const { |
205 | if (Shdr.sh_type != ELF::SHT_NOTE) { |
206 | Err = createError("attempt to iterate notes of non-note section"); |
207 | return Elf_Note_Iterator(Err); |
208 | } |
209 | if (Shdr.sh_offset + Shdr.sh_size > getBufSize()) { |
210 | Err = createError("invalid section offset/size"); |
211 | return Elf_Note_Iterator(Err); |
212 | } |
213 | return Elf_Note_Iterator(base() + Shdr.sh_offset, Shdr.sh_size, Err); |
214 | } |
215 | |
216 | /// Get the end iterator for notes. |
217 | Elf_Note_Iterator notes_end() const { |
218 | return Elf_Note_Iterator(); |
219 | } |
220 | |
221 | /// Get an iterator range over notes of a program header. |
222 | /// |
223 | /// The program header must be of type \c PT_NOTE. |
224 | /// |
225 | /// \param Phdr the program header to iterate over. |
226 | /// \param Err [out] an error to support fallible iteration, which should |
227 | /// be checked after iteration ends. |
228 | iterator_range<Elf_Note_Iterator> notes(const Elf_Phdr &Phdr, |
229 | Error &Err) const { |
230 | return make_range(notes_begin(Phdr, Err), notes_end()); |
231 | } |
232 | |
233 | /// Get an iterator range over notes of a section. |
234 | /// |
235 | /// The section must be of type \c SHT_NOTE. |
236 | /// |
237 | /// \param Shdr the section to iterate over. |
238 | /// \param Err [out] an error to support fallible iteration, which should |
239 | /// be checked after iteration ends. |
240 | iterator_range<Elf_Note_Iterator> notes(const Elf_Shdr &Shdr, |
241 | Error &Err) const { |
242 | return make_range(notes_begin(Shdr, Err), notes_end()); |
243 | } |
244 | |
245 | Expected<StringRef> getSectionStringTable(Elf_Shdr_Range Sections) const; |
246 | Expected<uint32_t> getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms, |
247 | ArrayRef<Elf_Word> ShndxTable) const; |
248 | Expected<const Elf_Shdr *> getSection(const Elf_Sym *Sym, |
249 | const Elf_Shdr *SymTab, |
250 | ArrayRef<Elf_Word> ShndxTable) const; |
251 | Expected<const Elf_Shdr *> getSection(const Elf_Sym *Sym, |
252 | Elf_Sym_Range Symtab, |
253 | ArrayRef<Elf_Word> ShndxTable) const; |
254 | Expected<const Elf_Shdr *> getSection(uint32_t Index) const; |
255 | Expected<const Elf_Shdr *> getSection(const StringRef SectionName) const; |
256 | |
257 | Expected<const Elf_Sym *> getSymbol(const Elf_Shdr *Sec, |
258 | uint32_t Index) const; |
259 | |
260 | Expected<StringRef> getSectionName(const Elf_Shdr *Section) const; |
261 | Expected<StringRef> getSectionName(const Elf_Shdr *Section, |
262 | StringRef DotShstrtab) const; |
263 | template <typename T> |
264 | Expected<ArrayRef<T>> getSectionContentsAsArray(const Elf_Shdr *Sec) const; |
265 | Expected<ArrayRef<uint8_t>> getSectionContents(const Elf_Shdr *Sec) const; |
266 | }; |
267 | |
268 | using ELF32LEFile = ELFFile<ELF32LE>; |
269 | using ELF64LEFile = ELFFile<ELF64LE>; |
270 | using ELF32BEFile = ELFFile<ELF32BE>; |
271 | using ELF64BEFile = ELFFile<ELF64BE>; |
272 | |
273 | template <class ELFT> |
274 | inline Expected<const typename ELFT::Shdr *> |
275 | getSection(typename ELFT::ShdrRange Sections, uint32_t Index) { |
276 | if (Index >= Sections.size()) |
277 | return createError("invalid section index"); |
278 | return &Sections[Index]; |
279 | } |
280 | |
281 | template <class ELFT> |
282 | inline Expected<uint32_t> |
283 | getExtendedSymbolTableIndex(const typename ELFT::Sym *Sym, |
284 | const typename ELFT::Sym *FirstSym, |
285 | ArrayRef<typename ELFT::Word> ShndxTable) { |
286 | assert(Sym->st_shndx == ELF::SHN_XINDEX)((Sym->st_shndx == ELF::SHN_XINDEX) ? static_cast<void> (0) : __assert_fail ("Sym->st_shndx == ELF::SHN_XINDEX", "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Object/ELF.h" , 286, __PRETTY_FUNCTION__)); |
287 | unsigned Index = Sym - FirstSym; |
288 | if (Index >= ShndxTable.size()) |
289 | return createError("index past the end of the symbol table"); |
290 | |
291 | // The size of the table was checked in getSHNDXTable. |
292 | return ShndxTable[Index]; |
293 | } |
294 | |
295 | template <class ELFT> |
296 | Expected<uint32_t> |
297 | ELFFile<ELFT>::getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms, |
298 | ArrayRef<Elf_Word> ShndxTable) const { |
299 | uint32_t Index = Sym->st_shndx; |
300 | if (Index == ELF::SHN_XINDEX) { |
301 | auto ErrorOrIndex = getExtendedSymbolTableIndex<ELFT>( |
302 | Sym, Syms.begin(), ShndxTable); |
303 | if (!ErrorOrIndex) |
304 | return ErrorOrIndex.takeError(); |
305 | return *ErrorOrIndex; |
306 | } |
307 | if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE) |
308 | return 0; |
309 | return Index; |
310 | } |
311 | |
312 | template <class ELFT> |
313 | Expected<const typename ELFT::Shdr *> |
314 | ELFFile<ELFT>::getSection(const Elf_Sym *Sym, const Elf_Shdr *SymTab, |
315 | ArrayRef<Elf_Word> ShndxTable) const { |
316 | auto SymsOrErr = symbols(SymTab); |
317 | if (!SymsOrErr) |
318 | return SymsOrErr.takeError(); |
319 | return getSection(Sym, *SymsOrErr, ShndxTable); |
320 | } |
321 | |
322 | template <class ELFT> |
323 | Expected<const typename ELFT::Shdr *> |
324 | ELFFile<ELFT>::getSection(const Elf_Sym *Sym, Elf_Sym_Range Symbols, |
325 | ArrayRef<Elf_Word> ShndxTable) const { |
326 | auto IndexOrErr = getSectionIndex(Sym, Symbols, ShndxTable); |
327 | if (!IndexOrErr) |
328 | return IndexOrErr.takeError(); |
329 | uint32_t Index = *IndexOrErr; |
330 | if (Index == 0) |
331 | return nullptr; |
332 | return getSection(Index); |
333 | } |
334 | |
335 | template <class ELFT> |
336 | inline Expected<const typename ELFT::Sym *> |
337 | getSymbol(typename ELFT::SymRange Symbols, uint32_t Index) { |
338 | if (Index >= Symbols.size()) |
339 | return createError("invalid symbol index"); |
340 | return &Symbols[Index]; |
341 | } |
342 | |
343 | template <class ELFT> |
344 | Expected<const typename ELFT::Sym *> |
345 | ELFFile<ELFT>::getSymbol(const Elf_Shdr *Sec, uint32_t Index) const { |
346 | auto SymtabOrErr = symbols(Sec); |
347 | if (!SymtabOrErr) |
348 | return SymtabOrErr.takeError(); |
349 | return object::getSymbol<ELFT>(*SymtabOrErr, Index); |
350 | } |
351 | |
352 | template <class ELFT> |
353 | template <typename T> |
354 | Expected<ArrayRef<T>> |
355 | ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr *Sec) const { |
356 | if (Sec->sh_entsize != sizeof(T) && sizeof(T) != 1) |
357 | return createError("invalid sh_entsize"); |
358 | |
359 | uintX_t Offset = Sec->sh_offset; |
360 | uintX_t Size = Sec->sh_size; |
361 | |
362 | if (Size % sizeof(T)) |
363 | return createError("size is not a multiple of sh_entsize"); |
364 | if ((std::numeric_limits<uintX_t>::max() - Offset < Size) || |
365 | Offset + Size > Buf.size()) |
366 | return createError("invalid section offset"); |
367 | |
368 | if (Offset % alignof(T)) |
369 | return createError("unaligned data"); |
370 | |
371 | const T *Start = reinterpret_cast<const T *>(base() + Offset); |
372 | return makeArrayRef(Start, Size / sizeof(T)); |
373 | } |
374 | |
375 | template <class ELFT> |
376 | Expected<ArrayRef<uint8_t>> |
377 | ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const { |
378 | return getSectionContentsAsArray<uint8_t>(Sec); |
379 | } |
380 | |
381 | template <class ELFT> |
382 | StringRef ELFFile<ELFT>::getRelocationTypeName(uint32_t Type) const { |
383 | return getELFRelocationTypeName(getHeader()->e_machine, Type); |
384 | } |
385 | |
386 | template <class ELFT> |
387 | void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type, |
388 | SmallVectorImpl<char> &Result) const { |
389 | if (!isMipsELF64()) { |
390 | StringRef Name = getRelocationTypeName(Type); |
391 | Result.append(Name.begin(), Name.end()); |
392 | } else { |
393 | // The Mips N64 ABI allows up to three operations to be specified per |
394 | // relocation record. Unfortunately there's no easy way to test for the |
395 | // presence of N64 ELFs as they have no special flag that identifies them |
396 | // as being N64. We can safely assume at the moment that all Mips |
397 | // ELFCLASS64 ELFs are N64. New Mips64 ABIs should provide enough |
398 | // information to disambiguate between old vs new ABIs. |
399 | uint8_t Type1 = (Type >> 0) & 0xFF; |
400 | uint8_t Type2 = (Type >> 8) & 0xFF; |
401 | uint8_t Type3 = (Type >> 16) & 0xFF; |
402 | |
403 | // Concat all three relocation type names. |
404 | StringRef Name = getRelocationTypeName(Type1); |
405 | Result.append(Name.begin(), Name.end()); |
406 | |
407 | Name = getRelocationTypeName(Type2); |
408 | Result.append(1, '/'); |
409 | Result.append(Name.begin(), Name.end()); |
410 | |
411 | Name = getRelocationTypeName(Type3); |
412 | Result.append(1, '/'); |
413 | Result.append(Name.begin(), Name.end()); |
414 | } |
415 | } |
416 | |
417 | template <class ELFT> |
418 | uint32_t ELFFile<ELFT>::getRelrRelocationType() const { |
419 | return getELFRelrRelocationType(getHeader()->e_machine); |
420 | } |
421 | |
422 | template <class ELFT> |
423 | Expected<const typename ELFT::Sym *> |
424 | ELFFile<ELFT>::getRelocationSymbol(const Elf_Rel *Rel, |
425 | const Elf_Shdr *SymTab) const { |
426 | uint32_t Index = Rel->getSymbol(isMips64EL()); |
427 | if (Index == 0) |
428 | return nullptr; |
429 | return getEntry<Elf_Sym>(SymTab, Index); |
430 | } |
431 | |
432 | template <class ELFT> |
433 | Expected<StringRef> |
434 | ELFFile<ELFT>::getSectionStringTable(Elf_Shdr_Range Sections) const { |
435 | uint32_t Index = getHeader()->e_shstrndx; |
436 | if (Index == ELF::SHN_XINDEX) |
437 | Index = Sections[0].sh_link; |
438 | |
439 | if (!Index) // no section string table. |
440 | return ""; |
441 | if (Index >= Sections.size()) |
442 | return createError("invalid section index"); |
443 | return getStringTable(&Sections[Index]); |
444 | } |
445 | |
446 | template <class ELFT> ELFFile<ELFT>::ELFFile(StringRef Object) : Buf(Object) {} |
447 | |
448 | template <class ELFT> |
449 | Expected<ELFFile<ELFT>> ELFFile<ELFT>::create(StringRef Object) { |
450 | if (sizeof(Elf_Ehdr) > Object.size()) |
451 | return createError("Invalid buffer"); |
452 | return ELFFile(Object); |
453 | } |
454 | |
455 | template <class ELFT> |
456 | Expected<typename ELFT::ShdrRange> ELFFile<ELFT>::sections() const { |
457 | const uintX_t SectionTableOffset = getHeader()->e_shoff; |
458 | if (SectionTableOffset == 0) |
459 | return ArrayRef<Elf_Shdr>(); |
460 | |
461 | if (getHeader()->e_shentsize != sizeof(Elf_Shdr)) |
462 | return createError( |
463 | "invalid section header entry size (e_shentsize) in ELF header"); |
464 | |
465 | const uint64_t FileSize = Buf.size(); |
466 | |
467 | if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize) |
468 | return createError("section header table goes past the end of the file"); |
469 | |
470 | // Invalid address alignment of section headers |
471 | if (SectionTableOffset & (alignof(Elf_Shdr) - 1)) |
472 | return createError("invalid alignment of section headers"); |
473 | |
474 | const Elf_Shdr *First = |
475 | reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset); |
476 | |
477 | uintX_t NumSections = getHeader()->e_shnum; |
478 | if (NumSections == 0) |
479 | NumSections = First->sh_size; |
480 | |
481 | if (NumSections > UINT64_MAX(18446744073709551615UL) / sizeof(Elf_Shdr)) |
482 | return createError("section table goes past the end of file"); |
483 | |
484 | const uint64_t SectionTableSize = NumSections * sizeof(Elf_Shdr); |
485 | |
486 | // Section table goes past end of file! |
487 | if (SectionTableOffset + SectionTableSize > FileSize) |
488 | return createError("section table goes past the end of file"); |
489 | |
490 | return makeArrayRef(First, NumSections); |
491 | } |
492 | |
493 | template <class ELFT> |
494 | template <typename T> |
495 | Expected<const T *> ELFFile<ELFT>::getEntry(uint32_t Section, |
496 | uint32_t Entry) const { |
497 | auto SecOrErr = getSection(Section); |
498 | if (!SecOrErr) |
499 | return SecOrErr.takeError(); |
500 | return getEntry<T>(*SecOrErr, Entry); |
501 | } |
502 | |
503 | template <class ELFT> |
504 | template <typename T> |
505 | Expected<const T *> ELFFile<ELFT>::getEntry(const Elf_Shdr *Section, |
506 | uint32_t Entry) const { |
507 | if (sizeof(T) != Section->sh_entsize) |
508 | return createError("invalid sh_entsize"); |
509 | size_t Pos = Section->sh_offset + Entry * sizeof(T); |
510 | if (Pos + sizeof(T) > Buf.size()) |
511 | return createError("invalid section offset"); |
512 | return reinterpret_cast<const T *>(base() + Pos); |
513 | } |
514 | |
515 | template <class ELFT> |
516 | Expected<const typename ELFT::Shdr *> |
517 | ELFFile<ELFT>::getSection(uint32_t Index) const { |
518 | auto TableOrErr = sections(); |
519 | if (!TableOrErr) |
520 | return TableOrErr.takeError(); |
521 | return object::getSection<ELFT>(*TableOrErr, Index); |
522 | } |
523 | |
524 | template <class ELFT> |
525 | Expected<const typename ELFT::Shdr *> |
526 | ELFFile<ELFT>::getSection(const StringRef SectionName) const { |
527 | auto TableOrErr = sections(); |
528 | if (!TableOrErr) |
529 | return TableOrErr.takeError(); |
530 | for (auto &Sec : *TableOrErr) { |
531 | auto SecNameOrErr = getSectionName(&Sec); |
532 | if (!SecNameOrErr) |
533 | return SecNameOrErr.takeError(); |
534 | if (*SecNameOrErr == SectionName) |
535 | return &Sec; |
536 | } |
537 | return createError("invalid section name"); |
538 | } |
539 | |
540 | template <class ELFT> |
541 | Expected<StringRef> |
542 | ELFFile<ELFT>::getStringTable(const Elf_Shdr *Section) const { |
543 | if (Section->sh_type != ELF::SHT_STRTAB) |
544 | return createError("invalid sh_type for string table, expected SHT_STRTAB"); |
545 | auto V = getSectionContentsAsArray<char>(Section); |
546 | if (!V) |
547 | return V.takeError(); |
548 | ArrayRef<char> Data = *V; |
549 | if (Data.empty()) |
550 | return createError("empty string table"); |
551 | if (Data.back() != '\0') |
552 | return createError("string table non-null terminated"); |
553 | return StringRef(Data.begin(), Data.size()); |
554 | } |
555 | |
556 | template <class ELFT> |
557 | Expected<ArrayRef<typename ELFT::Word>> |
558 | ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const { |
559 | auto SectionsOrErr = sections(); |
560 | if (!SectionsOrErr) |
561 | return SectionsOrErr.takeError(); |
562 | return getSHNDXTable(Section, *SectionsOrErr); |
563 | } |
564 | |
565 | template <class ELFT> |
566 | Expected<ArrayRef<typename ELFT::Word>> |
567 | ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section, |
568 | Elf_Shdr_Range Sections) const { |
569 | assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX)((Section.sh_type == ELF::SHT_SYMTAB_SHNDX) ? static_cast< void> (0) : __assert_fail ("Section.sh_type == ELF::SHT_SYMTAB_SHNDX" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Object/ELF.h" , 569, __PRETTY_FUNCTION__)); |
570 | auto VOrErr = getSectionContentsAsArray<Elf_Word>(&Section); |
571 | if (!VOrErr) |
572 | return VOrErr.takeError(); |
573 | ArrayRef<Elf_Word> V = *VOrErr; |
574 | auto SymTableOrErr = object::getSection<ELFT>(Sections, Section.sh_link); |
575 | if (!SymTableOrErr) |
576 | return SymTableOrErr.takeError(); |
577 | const Elf_Shdr &SymTable = **SymTableOrErr; |
578 | if (SymTable.sh_type != ELF::SHT_SYMTAB && |
579 | SymTable.sh_type != ELF::SHT_DYNSYM) |
580 | return createError("invalid sh_type"); |
581 | if (V.size() != (SymTable.sh_size / sizeof(Elf_Sym))) |
582 | return createError("invalid section contents size"); |
583 | return V; |
584 | } |
585 | |
586 | template <class ELFT> |
587 | Expected<StringRef> |
588 | ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const { |
589 | auto SectionsOrErr = sections(); |
590 | if (!SectionsOrErr) |
591 | return SectionsOrErr.takeError(); |
592 | return getStringTableForSymtab(Sec, *SectionsOrErr); |
593 | } |
594 | |
595 | template <class ELFT> |
596 | Expected<StringRef> |
597 | ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec, |
598 | Elf_Shdr_Range Sections) const { |
599 | |
600 | if (Sec.sh_type != ELF::SHT_SYMTAB && Sec.sh_type != ELF::SHT_DYNSYM) |
601 | return createError( |
602 | "invalid sh_type for symbol table, expected SHT_SYMTAB or SHT_DYNSYM"); |
603 | auto SectionOrErr = object::getSection<ELFT>(Sections, Sec.sh_link); |
604 | if (!SectionOrErr) |
605 | return SectionOrErr.takeError(); |
606 | return getStringTable(*SectionOrErr); |
607 | } |
608 | |
609 | template <class ELFT> |
610 | Expected<StringRef> |
611 | ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const { |
612 | auto SectionsOrErr = sections(); |
613 | if (!SectionsOrErr) |
614 | return SectionsOrErr.takeError(); |
615 | auto Table = getSectionStringTable(*SectionsOrErr); |
616 | if (!Table) |
617 | return Table.takeError(); |
618 | return getSectionName(Section, *Table); |
619 | } |
620 | |
621 | template <class ELFT> |
622 | Expected<StringRef> ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section, |
623 | StringRef DotShstrtab) const { |
624 | uint32_t Offset = Section->sh_name; |
625 | if (Offset == 0) |
626 | return StringRef(); |
627 | if (Offset >= DotShstrtab.size()) |
628 | return createError("invalid string offset"); |
629 | return StringRef(DotShstrtab.data() + Offset); |
630 | } |
631 | |
632 | /// This function returns the hash value for a symbol in the .dynsym section |
633 | /// Name of the API remains consistent as specified in the libelf |
634 | /// REF : http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#hash |
635 | inline unsigned hashSysV(StringRef SymbolName) { |
636 | unsigned h = 0, g; |
637 | for (char C : SymbolName) { |
638 | h = (h << 4) + C; |
639 | g = h & 0xf0000000L; |
640 | if (g != 0) |
641 | h ^= g >> 24; |
642 | h &= ~g; |
643 | } |
644 | return h; |
645 | } |
646 | |
647 | } // end namespace object |
648 | } // end namespace llvm |
649 | |
650 | #endif // LLVM_OBJECT_ELF_H |
1 | //===- llvm/Support/Error.h - Recoverable error handling --------*- C++ -*-===// | |||
2 | // | |||
3 | // The LLVM Compiler Infrastructure | |||
4 | // | |||
5 | // This file is distributed under the University of Illinois Open Source | |||
6 | // License. See LICENSE.TXT for details. | |||
7 | // | |||
8 | //===----------------------------------------------------------------------===// | |||
9 | // | |||
10 | // This file defines an API used to report recoverable errors. | |||
11 | // | |||
12 | //===----------------------------------------------------------------------===// | |||
13 | ||||
14 | #ifndef LLVM_SUPPORT_ERROR_H | |||
15 | #define LLVM_SUPPORT_ERROR_H | |||
16 | ||||
17 | #include "llvm-c/Error.h" | |||
18 | #include "llvm/ADT/STLExtras.h" | |||
19 | #include "llvm/ADT/SmallVector.h" | |||
20 | #include "llvm/ADT/StringExtras.h" | |||
21 | #include "llvm/ADT/Twine.h" | |||
22 | #include "llvm/Config/abi-breaking.h" | |||
23 | #include "llvm/Support/AlignOf.h" | |||
24 | #include "llvm/Support/Compiler.h" | |||
25 | #include "llvm/Support/Debug.h" | |||
26 | #include "llvm/Support/ErrorHandling.h" | |||
27 | #include "llvm/Support/ErrorOr.h" | |||
28 | #include "llvm/Support/Format.h" | |||
29 | #include "llvm/Support/raw_ostream.h" | |||
30 | #include <algorithm> | |||
31 | #include <cassert> | |||
32 | #include <cstdint> | |||
33 | #include <cstdlib> | |||
34 | #include <functional> | |||
35 | #include <memory> | |||
36 | #include <new> | |||
37 | #include <string> | |||
38 | #include <system_error> | |||
39 | #include <type_traits> | |||
40 | #include <utility> | |||
41 | #include <vector> | |||
42 | ||||
43 | namespace llvm { | |||
44 | ||||
45 | class ErrorSuccess; | |||
46 | ||||
47 | /// Base class for error info classes. Do not extend this directly: Extend | |||
48 | /// the ErrorInfo template subclass instead. | |||
49 | class ErrorInfoBase { | |||
50 | public: | |||
51 | virtual ~ErrorInfoBase() = default; | |||
52 | ||||
53 | /// Print an error message to an output stream. | |||
54 | virtual void log(raw_ostream &OS) const = 0; | |||
55 | ||||
56 | /// Return the error message as a string. | |||
57 | virtual std::string message() const { | |||
58 | std::string Msg; | |||
59 | raw_string_ostream OS(Msg); | |||
60 | log(OS); | |||
61 | return OS.str(); | |||
62 | } | |||
63 | ||||
64 | /// Convert this error to a std::error_code. | |||
65 | /// | |||
66 | /// This is a temporary crutch to enable interaction with code still | |||
67 | /// using std::error_code. It will be removed in the future. | |||
68 | virtual std::error_code convertToErrorCode() const = 0; | |||
69 | ||||
70 | // Returns the class ID for this type. | |||
71 | static const void *classID() { return &ID; } | |||
72 | ||||
73 | // Returns the class ID for the dynamic type of this ErrorInfoBase instance. | |||
74 | virtual const void *dynamicClassID() const = 0; | |||
75 | ||||
76 | // Check whether this instance is a subclass of the class identified by | |||
77 | // ClassID. | |||
78 | virtual bool isA(const void *const ClassID) const { | |||
79 | return ClassID == classID(); | |||
80 | } | |||
81 | ||||
82 | // Check whether this instance is a subclass of ErrorInfoT. | |||
83 | template <typename ErrorInfoT> bool isA() const { | |||
84 | return isA(ErrorInfoT::classID()); | |||
85 | } | |||
86 | ||||
87 | private: | |||
88 | virtual void anchor(); | |||
89 | ||||
90 | static char ID; | |||
91 | }; | |||
92 | ||||
93 | /// Lightweight error class with error context and mandatory checking. | |||
94 | /// | |||
95 | /// Instances of this class wrap a ErrorInfoBase pointer. Failure states | |||
96 | /// are represented by setting the pointer to a ErrorInfoBase subclass | |||
97 | /// instance containing information describing the failure. Success is | |||
98 | /// represented by a null pointer value. | |||
99 | /// | |||
100 | /// Instances of Error also contains a 'Checked' flag, which must be set | |||
101 | /// before the destructor is called, otherwise the destructor will trigger a | |||
102 | /// runtime error. This enforces at runtime the requirement that all Error | |||
103 | /// instances be checked or returned to the caller. | |||
104 | /// | |||
105 | /// There are two ways to set the checked flag, depending on what state the | |||
106 | /// Error instance is in. For Error instances indicating success, it | |||
107 | /// is sufficient to invoke the boolean conversion operator. E.g.: | |||
108 | /// | |||
109 | /// @code{.cpp} | |||
110 | /// Error foo(<...>); | |||
111 | /// | |||
112 | /// if (auto E = foo(<...>)) | |||
113 | /// return E; // <- Return E if it is in the error state. | |||
114 | /// // We have verified that E was in the success state. It can now be safely | |||
115 | /// // destroyed. | |||
116 | /// @endcode | |||
117 | /// | |||
118 | /// A success value *can not* be dropped. For example, just calling 'foo(<...>)' | |||
119 | /// without testing the return value will raise a runtime error, even if foo | |||
120 | /// returns success. | |||
121 | /// | |||
122 | /// For Error instances representing failure, you must use either the | |||
123 | /// handleErrors or handleAllErrors function with a typed handler. E.g.: | |||
124 | /// | |||
125 | /// @code{.cpp} | |||
126 | /// class MyErrorInfo : public ErrorInfo<MyErrorInfo> { | |||
127 | /// // Custom error info. | |||
128 | /// }; | |||
129 | /// | |||
130 | /// Error foo(<...>) { return make_error<MyErrorInfo>(...); } | |||
131 | /// | |||
132 | /// auto E = foo(<...>); // <- foo returns failure with MyErrorInfo. | |||
133 | /// auto NewE = | |||
134 | /// handleErrors(E, | |||
135 | /// [](const MyErrorInfo &M) { | |||
136 | /// // Deal with the error. | |||
137 | /// }, | |||
138 | /// [](std::unique_ptr<OtherError> M) -> Error { | |||
139 | /// if (canHandle(*M)) { | |||
140 | /// // handle error. | |||
141 | /// return Error::success(); | |||
142 | /// } | |||
143 | /// // Couldn't handle this error instance. Pass it up the stack. | |||
144 | /// return Error(std::move(M)); | |||
145 | /// ); | |||
146 | /// // Note - we must check or return NewE in case any of the handlers | |||
147 | /// // returned a new error. | |||
148 | /// @endcode | |||
149 | /// | |||
150 | /// The handleAllErrors function is identical to handleErrors, except | |||
151 | /// that it has a void return type, and requires all errors to be handled and | |||
152 | /// no new errors be returned. It prevents errors (assuming they can all be | |||
153 | /// handled) from having to be bubbled all the way to the top-level. | |||
154 | /// | |||
155 | /// *All* Error instances must be checked before destruction, even if | |||
156 | /// they're moved-assigned or constructed from Success values that have already | |||
157 | /// been checked. This enforces checking through all levels of the call stack. | |||
158 | class LLVM_NODISCARD[[clang::warn_unused_result]] Error { | |||
159 | // Both ErrorList and FileError need to be able to yank ErrorInfoBase | |||
160 | // pointers out of this class to add to the error list. | |||
161 | friend class ErrorList; | |||
162 | friend class FileError; | |||
163 | ||||
164 | // handleErrors needs to be able to set the Checked flag. | |||
165 | template <typename... HandlerTs> | |||
166 | friend Error handleErrors(Error E, HandlerTs &&... Handlers); | |||
167 | ||||
168 | // Expected<T> needs to be able to steal the payload when constructed from an | |||
169 | // error. | |||
170 | template <typename T> friend class Expected; | |||
171 | ||||
172 | // wrap needs to be able to steal the payload. | |||
173 | friend LLVMErrorRef wrap(Error); | |||
174 | ||||
175 | protected: | |||
176 | /// Create a success value. Prefer using 'Error::success()' for readability | |||
177 | Error() { | |||
178 | setPtr(nullptr); | |||
179 | setChecked(false); | |||
180 | } | |||
181 | ||||
182 | public: | |||
183 | /// Create a success value. | |||
184 | static ErrorSuccess success(); | |||
185 | ||||
186 | // Errors are not copy-constructable. | |||
187 | Error(const Error &Other) = delete; | |||
188 | ||||
189 | /// Move-construct an error value. The newly constructed error is considered | |||
190 | /// unchecked, even if the source error had been checked. The original error | |||
191 | /// becomes a checked Success value, regardless of its original state. | |||
192 | Error(Error &&Other) { | |||
193 | setChecked(true); | |||
194 | *this = std::move(Other); | |||
195 | } | |||
196 | ||||
197 | /// Create an error value. Prefer using the 'make_error' function, but | |||
198 | /// this constructor can be useful when "re-throwing" errors from handlers. | |||
199 | Error(std::unique_ptr<ErrorInfoBase> Payload) { | |||
200 | setPtr(Payload.release()); | |||
201 | setChecked(false); | |||
| ||||
202 | } | |||
203 | ||||
204 | // Errors are not copy-assignable. | |||
205 | Error &operator=(const Error &Other) = delete; | |||
206 | ||||
207 | /// Move-assign an error value. The current error must represent success, you | |||
208 | /// you cannot overwrite an unhandled error. The current error is then | |||
209 | /// considered unchecked. The source error becomes a checked success value, | |||
210 | /// regardless of its original state. | |||
211 | Error &operator=(Error &&Other) { | |||
212 | // Don't allow overwriting of unchecked values. | |||
213 | assertIsChecked(); | |||
214 | setPtr(Other.getPtr()); | |||
215 | ||||
216 | // This Error is unchecked, even if the source error was checked. | |||
217 | setChecked(false); | |||
218 | ||||
219 | // Null out Other's payload and set its checked bit. | |||
220 | Other.setPtr(nullptr); | |||
221 | Other.setChecked(true); | |||
222 | ||||
223 | return *this; | |||
224 | } | |||
225 | ||||
226 | /// Destroy a Error. Fails with a call to abort() if the error is | |||
227 | /// unchecked. | |||
228 | ~Error() { | |||
229 | assertIsChecked(); | |||
230 | delete getPtr(); | |||
231 | } | |||
232 | ||||
233 | /// Bool conversion. Returns true if this Error is in a failure state, | |||
234 | /// and false if it is in an accept state. If the error is in a Success state | |||
235 | /// it will be considered checked. | |||
236 | explicit operator bool() { | |||
237 | setChecked(getPtr() == nullptr); | |||
238 | return getPtr() != nullptr; | |||
239 | } | |||
240 | ||||
241 | /// Check whether one error is a subclass of another. | |||
242 | template <typename ErrT> bool isA() const { | |||
243 | return getPtr() && getPtr()->isA(ErrT::classID()); | |||
244 | } | |||
245 | ||||
246 | /// Returns the dynamic class id of this error, or null if this is a success | |||
247 | /// value. | |||
248 | const void* dynamicClassID() const { | |||
249 | if (!getPtr()) | |||
250 | return nullptr; | |||
251 | return getPtr()->dynamicClassID(); | |||
252 | } | |||
253 | ||||
254 | private: | |||
255 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
256 | // assertIsChecked() happens very frequently, but under normal circumstances | |||
257 | // is supposed to be a no-op. So we want it to be inlined, but having a bunch | |||
258 | // of debug prints can cause the function to be too large for inlining. So | |||
259 | // it's important that we define this function out of line so that it can't be | |||
260 | // inlined. | |||
261 | LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn)) | |||
262 | void fatalUncheckedError() const; | |||
263 | #endif | |||
264 | ||||
265 | void assertIsChecked() { | |||
266 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
267 | if (LLVM_UNLIKELY(!getChecked() || getPtr())__builtin_expect((bool)(!getChecked() || getPtr()), false)) | |||
268 | fatalUncheckedError(); | |||
269 | #endif | |||
270 | } | |||
271 | ||||
272 | ErrorInfoBase *getPtr() const { | |||
273 | return reinterpret_cast<ErrorInfoBase*>( | |||
274 | reinterpret_cast<uintptr_t>(Payload) & | |||
275 | ~static_cast<uintptr_t>(0x1)); | |||
276 | } | |||
277 | ||||
278 | void setPtr(ErrorInfoBase *EI) { | |||
279 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
280 | Payload = reinterpret_cast<ErrorInfoBase*>( | |||
281 | (reinterpret_cast<uintptr_t>(EI) & | |||
282 | ~static_cast<uintptr_t>(0x1)) | | |||
283 | (reinterpret_cast<uintptr_t>(Payload) & 0x1)); | |||
284 | #else | |||
285 | Payload = EI; | |||
286 | #endif | |||
287 | } | |||
288 | ||||
289 | bool getChecked() const { | |||
290 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
291 | return (reinterpret_cast<uintptr_t>(Payload) & 0x1) == 0; | |||
292 | #else | |||
293 | return true; | |||
294 | #endif | |||
295 | } | |||
296 | ||||
297 | void setChecked(bool V) { | |||
298 | Payload = reinterpret_cast<ErrorInfoBase*>( | |||
299 | (reinterpret_cast<uintptr_t>(Payload) & | |||
300 | ~static_cast<uintptr_t>(0x1)) | | |||
301 | (V ? 0 : 1)); | |||
302 | } | |||
303 | ||||
304 | std::unique_ptr<ErrorInfoBase> takePayload() { | |||
305 | std::unique_ptr<ErrorInfoBase> Tmp(getPtr()); | |||
306 | setPtr(nullptr); | |||
307 | setChecked(true); | |||
308 | return Tmp; | |||
309 | } | |||
310 | ||||
311 | friend raw_ostream &operator<<(raw_ostream &OS, const Error &E) { | |||
312 | if (auto P = E.getPtr()) | |||
313 | P->log(OS); | |||
314 | else | |||
315 | OS << "success"; | |||
316 | return OS; | |||
317 | } | |||
318 | ||||
319 | ErrorInfoBase *Payload = nullptr; | |||
320 | }; | |||
321 | ||||
322 | /// Subclass of Error for the sole purpose of identifying the success path in | |||
323 | /// the type system. This allows to catch invalid conversion to Expected<T> at | |||
324 | /// compile time. | |||
325 | class ErrorSuccess final : public Error {}; | |||
326 | ||||
327 | inline ErrorSuccess Error::success() { return ErrorSuccess(); } | |||
328 | ||||
329 | /// Make a Error instance representing failure using the given error info | |||
330 | /// type. | |||
331 | template <typename ErrT, typename... ArgTs> Error make_error(ArgTs &&... Args) { | |||
332 | return Error(llvm::make_unique<ErrT>(std::forward<ArgTs>(Args)...)); | |||
333 | } | |||
334 | ||||
335 | /// Base class for user error types. Users should declare their error types | |||
336 | /// like: | |||
337 | /// | |||
338 | /// class MyError : public ErrorInfo<MyError> { | |||
339 | /// .... | |||
340 | /// }; | |||
341 | /// | |||
342 | /// This class provides an implementation of the ErrorInfoBase::kind | |||
343 | /// method, which is used by the Error RTTI system. | |||
344 | template <typename ThisErrT, typename ParentErrT = ErrorInfoBase> | |||
345 | class ErrorInfo : public ParentErrT { | |||
346 | public: | |||
347 | using ParentErrT::ParentErrT; // inherit constructors | |||
348 | ||||
349 | static const void *classID() { return &ThisErrT::ID; } | |||
350 | ||||
351 | const void *dynamicClassID() const override { return &ThisErrT::ID; } | |||
352 | ||||
353 | bool isA(const void *const ClassID) const override { | |||
354 | return ClassID == classID() || ParentErrT::isA(ClassID); | |||
355 | } | |||
356 | }; | |||
357 | ||||
358 | /// Special ErrorInfo subclass representing a list of ErrorInfos. | |||
359 | /// Instances of this class are constructed by joinError. | |||
360 | class ErrorList final : public ErrorInfo<ErrorList> { | |||
361 | // handleErrors needs to be able to iterate the payload list of an | |||
362 | // ErrorList. | |||
363 | template <typename... HandlerTs> | |||
364 | friend Error handleErrors(Error E, HandlerTs &&... Handlers); | |||
365 | ||||
366 | // joinErrors is implemented in terms of join. | |||
367 | friend Error joinErrors(Error, Error); | |||
368 | ||||
369 | public: | |||
370 | void log(raw_ostream &OS) const override { | |||
371 | OS << "Multiple errors:\n"; | |||
372 | for (auto &ErrPayload : Payloads) { | |||
373 | ErrPayload->log(OS); | |||
374 | OS << "\n"; | |||
375 | } | |||
376 | } | |||
377 | ||||
378 | std::error_code convertToErrorCode() const override; | |||
379 | ||||
380 | // Used by ErrorInfo::classID. | |||
381 | static char ID; | |||
382 | ||||
383 | private: | |||
384 | ErrorList(std::unique_ptr<ErrorInfoBase> Payload1, | |||
385 | std::unique_ptr<ErrorInfoBase> Payload2) { | |||
386 | assert(!Payload1->isA<ErrorList>() && !Payload2->isA<ErrorList>() &&((!Payload1->isA<ErrorList>() && !Payload2-> isA<ErrorList>() && "ErrorList constructor payloads should be singleton errors" ) ? static_cast<void> (0) : __assert_fail ("!Payload1->isA<ErrorList>() && !Payload2->isA<ErrorList>() && \"ErrorList constructor payloads should be singleton errors\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 387, __PRETTY_FUNCTION__)) | |||
387 | "ErrorList constructor payloads should be singleton errors")((!Payload1->isA<ErrorList>() && !Payload2-> isA<ErrorList>() && "ErrorList constructor payloads should be singleton errors" ) ? static_cast<void> (0) : __assert_fail ("!Payload1->isA<ErrorList>() && !Payload2->isA<ErrorList>() && \"ErrorList constructor payloads should be singleton errors\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 387, __PRETTY_FUNCTION__)); | |||
388 | Payloads.push_back(std::move(Payload1)); | |||
389 | Payloads.push_back(std::move(Payload2)); | |||
390 | } | |||
391 | ||||
392 | static Error join(Error E1, Error E2) { | |||
393 | if (!E1) | |||
394 | return E2; | |||
395 | if (!E2) | |||
396 | return E1; | |||
397 | if (E1.isA<ErrorList>()) { | |||
398 | auto &E1List = static_cast<ErrorList &>(*E1.getPtr()); | |||
399 | if (E2.isA<ErrorList>()) { | |||
400 | auto E2Payload = E2.takePayload(); | |||
401 | auto &E2List = static_cast<ErrorList &>(*E2Payload); | |||
402 | for (auto &Payload : E2List.Payloads) | |||
403 | E1List.Payloads.push_back(std::move(Payload)); | |||
404 | } else | |||
405 | E1List.Payloads.push_back(E2.takePayload()); | |||
406 | ||||
407 | return E1; | |||
408 | } | |||
409 | if (E2.isA<ErrorList>()) { | |||
410 | auto &E2List = static_cast<ErrorList &>(*E2.getPtr()); | |||
411 | E2List.Payloads.insert(E2List.Payloads.begin(), E1.takePayload()); | |||
412 | return E2; | |||
413 | } | |||
414 | return Error(std::unique_ptr<ErrorList>( | |||
415 | new ErrorList(E1.takePayload(), E2.takePayload()))); | |||
416 | } | |||
417 | ||||
418 | std::vector<std::unique_ptr<ErrorInfoBase>> Payloads; | |||
419 | }; | |||
420 | ||||
421 | /// Concatenate errors. The resulting Error is unchecked, and contains the | |||
422 | /// ErrorInfo(s), if any, contained in E1, followed by the | |||
423 | /// ErrorInfo(s), if any, contained in E2. | |||
424 | inline Error joinErrors(Error E1, Error E2) { | |||
425 | return ErrorList::join(std::move(E1), std::move(E2)); | |||
426 | } | |||
427 | ||||
428 | /// Tagged union holding either a T or a Error. | |||
429 | /// | |||
430 | /// This class parallels ErrorOr, but replaces error_code with Error. Since | |||
431 | /// Error cannot be copied, this class replaces getError() with | |||
432 | /// takeError(). It also adds an bool errorIsA<ErrT>() method for testing the | |||
433 | /// error class type. | |||
434 | template <class T> class LLVM_NODISCARD[[clang::warn_unused_result]] Expected { | |||
435 | template <class T1> friend class ExpectedAsOutParameter; | |||
436 | template <class OtherT> friend class Expected; | |||
437 | ||||
438 | static const bool isRef = std::is_reference<T>::value; | |||
439 | ||||
440 | using wrap = std::reference_wrapper<typename std::remove_reference<T>::type>; | |||
441 | ||||
442 | using error_type = std::unique_ptr<ErrorInfoBase>; | |||
443 | ||||
444 | public: | |||
445 | using storage_type = typename std::conditional<isRef, wrap, T>::type; | |||
446 | using value_type = T; | |||
447 | ||||
448 | private: | |||
449 | using reference = typename std::remove_reference<T>::type &; | |||
450 | using const_reference = const typename std::remove_reference<T>::type &; | |||
451 | using pointer = typename std::remove_reference<T>::type *; | |||
452 | using const_pointer = const typename std::remove_reference<T>::type *; | |||
453 | ||||
454 | public: | |||
455 | /// Create an Expected<T> error value from the given Error. | |||
456 | Expected(Error Err) | |||
457 | : HasError(true) | |||
458 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
459 | // Expected is unchecked upon construction in Debug builds. | |||
460 | , Unchecked(true) | |||
461 | #endif | |||
462 | { | |||
463 | assert(Err && "Cannot create Expected<T> from Error success value.")((Err && "Cannot create Expected<T> from Error success value." ) ? static_cast<void> (0) : __assert_fail ("Err && \"Cannot create Expected<T> from Error success value.\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 463, __PRETTY_FUNCTION__)); | |||
464 | new (getErrorStorage()) error_type(Err.takePayload()); | |||
465 | } | |||
466 | ||||
467 | /// Forbid to convert from Error::success() implicitly, this avoids having | |||
468 | /// Expected<T> foo() { return Error::success(); } which compiles otherwise | |||
469 | /// but triggers the assertion above. | |||
470 | Expected(ErrorSuccess) = delete; | |||
471 | ||||
472 | /// Create an Expected<T> success value from the given OtherT value, which | |||
473 | /// must be convertible to T. | |||
474 | template <typename OtherT> | |||
475 | Expected(OtherT &&Val, | |||
476 | typename std::enable_if<std::is_convertible<OtherT, T>::value>::type | |||
477 | * = nullptr) | |||
478 | : HasError(false) | |||
479 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
480 | // Expected is unchecked upon construction in Debug builds. | |||
481 | , Unchecked(true) | |||
482 | #endif | |||
483 | { | |||
484 | new (getStorage()) storage_type(std::forward<OtherT>(Val)); | |||
485 | } | |||
486 | ||||
487 | /// Move construct an Expected<T> value. | |||
488 | Expected(Expected &&Other) { moveConstruct(std::move(Other)); } | |||
489 | ||||
490 | /// Move construct an Expected<T> value from an Expected<OtherT>, where OtherT | |||
491 | /// must be convertible to T. | |||
492 | template <class OtherT> | |||
493 | Expected(Expected<OtherT> &&Other, | |||
494 | typename std::enable_if<std::is_convertible<OtherT, T>::value>::type | |||
495 | * = nullptr) { | |||
496 | moveConstruct(std::move(Other)); | |||
497 | } | |||
498 | ||||
499 | /// Move construct an Expected<T> value from an Expected<OtherT>, where OtherT | |||
500 | /// isn't convertible to T. | |||
501 | template <class OtherT> | |||
502 | explicit Expected( | |||
503 | Expected<OtherT> &&Other, | |||
504 | typename std::enable_if<!std::is_convertible<OtherT, T>::value>::type * = | |||
505 | nullptr) { | |||
506 | moveConstruct(std::move(Other)); | |||
507 | } | |||
508 | ||||
509 | /// Move-assign from another Expected<T>. | |||
510 | Expected &operator=(Expected &&Other) { | |||
511 | moveAssign(std::move(Other)); | |||
512 | return *this; | |||
513 | } | |||
514 | ||||
515 | /// Destroy an Expected<T>. | |||
516 | ~Expected() { | |||
517 | assertIsChecked(); | |||
518 | if (!HasError) | |||
519 | getStorage()->~storage_type(); | |||
520 | else | |||
521 | getErrorStorage()->~error_type(); | |||
522 | } | |||
523 | ||||
524 | /// Return false if there is an error. | |||
525 | explicit operator bool() { | |||
526 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
527 | Unchecked = HasError; | |||
528 | #endif | |||
529 | return !HasError; | |||
530 | } | |||
531 | ||||
532 | /// Returns a reference to the stored T value. | |||
533 | reference get() { | |||
534 | assertIsChecked(); | |||
535 | return *getStorage(); | |||
536 | } | |||
537 | ||||
538 | /// Returns a const reference to the stored T value. | |||
539 | const_reference get() const { | |||
540 | assertIsChecked(); | |||
541 | return const_cast<Expected<T> *>(this)->get(); | |||
542 | } | |||
543 | ||||
544 | /// Check that this Expected<T> is an error of type ErrT. | |||
545 | template <typename ErrT> bool errorIsA() const { | |||
546 | return HasError && (*getErrorStorage())->template isA<ErrT>(); | |||
547 | } | |||
548 | ||||
549 | /// Take ownership of the stored error. | |||
550 | /// After calling this the Expected<T> is in an indeterminate state that can | |||
551 | /// only be safely destructed. No further calls (beside the destructor) should | |||
552 | /// be made on the Expected<T> vaule. | |||
553 | Error takeError() { | |||
554 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
555 | Unchecked = false; | |||
556 | #endif | |||
557 | return HasError ? Error(std::move(*getErrorStorage())) : Error::success(); | |||
558 | } | |||
559 | ||||
560 | /// Returns a pointer to the stored T value. | |||
561 | pointer operator->() { | |||
562 | assertIsChecked(); | |||
563 | return toPointer(getStorage()); | |||
564 | } | |||
565 | ||||
566 | /// Returns a const pointer to the stored T value. | |||
567 | const_pointer operator->() const { | |||
568 | assertIsChecked(); | |||
569 | return toPointer(getStorage()); | |||
570 | } | |||
571 | ||||
572 | /// Returns a reference to the stored T value. | |||
573 | reference operator*() { | |||
574 | assertIsChecked(); | |||
575 | return *getStorage(); | |||
576 | } | |||
577 | ||||
578 | /// Returns a const reference to the stored T value. | |||
579 | const_reference operator*() const { | |||
580 | assertIsChecked(); | |||
581 | return *getStorage(); | |||
582 | } | |||
583 | ||||
584 | private: | |||
585 | template <class T1> | |||
586 | static bool compareThisIfSameType(const T1 &a, const T1 &b) { | |||
587 | return &a == &b; | |||
588 | } | |||
589 | ||||
590 | template <class T1, class T2> | |||
591 | static bool compareThisIfSameType(const T1 &a, const T2 &b) { | |||
592 | return false; | |||
593 | } | |||
594 | ||||
595 | template <class OtherT> void moveConstruct(Expected<OtherT> &&Other) { | |||
596 | HasError = Other.HasError; | |||
597 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
598 | Unchecked = true; | |||
599 | Other.Unchecked = false; | |||
600 | #endif | |||
601 | ||||
602 | if (!HasError) | |||
603 | new (getStorage()) storage_type(std::move(*Other.getStorage())); | |||
604 | else | |||
605 | new (getErrorStorage()) error_type(std::move(*Other.getErrorStorage())); | |||
606 | } | |||
607 | ||||
608 | template <class OtherT> void moveAssign(Expected<OtherT> &&Other) { | |||
609 | assertIsChecked(); | |||
610 | ||||
611 | if (compareThisIfSameType(*this, Other)) | |||
612 | return; | |||
613 | ||||
614 | this->~Expected(); | |||
615 | new (this) Expected(std::move(Other)); | |||
616 | } | |||
617 | ||||
618 | pointer toPointer(pointer Val) { return Val; } | |||
619 | ||||
620 | const_pointer toPointer(const_pointer Val) const { return Val; } | |||
621 | ||||
622 | pointer toPointer(wrap *Val) { return &Val->get(); } | |||
623 | ||||
624 | const_pointer toPointer(const wrap *Val) const { return &Val->get(); } | |||
625 | ||||
626 | storage_type *getStorage() { | |||
627 | assert(!HasError && "Cannot get value when an error exists!")((!HasError && "Cannot get value when an error exists!" ) ? static_cast<void> (0) : __assert_fail ("!HasError && \"Cannot get value when an error exists!\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 627, __PRETTY_FUNCTION__)); | |||
628 | return reinterpret_cast<storage_type *>(TStorage.buffer); | |||
629 | } | |||
630 | ||||
631 | const storage_type *getStorage() const { | |||
632 | assert(!HasError && "Cannot get value when an error exists!")((!HasError && "Cannot get value when an error exists!" ) ? static_cast<void> (0) : __assert_fail ("!HasError && \"Cannot get value when an error exists!\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 632, __PRETTY_FUNCTION__)); | |||
633 | return reinterpret_cast<const storage_type *>(TStorage.buffer); | |||
634 | } | |||
635 | ||||
636 | error_type *getErrorStorage() { | |||
637 | assert(HasError && "Cannot get error when a value exists!")((HasError && "Cannot get error when a value exists!" ) ? static_cast<void> (0) : __assert_fail ("HasError && \"Cannot get error when a value exists!\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 637, __PRETTY_FUNCTION__)); | |||
638 | return reinterpret_cast<error_type *>(ErrorStorage.buffer); | |||
639 | } | |||
640 | ||||
641 | const error_type *getErrorStorage() const { | |||
642 | assert(HasError && "Cannot get error when a value exists!")((HasError && "Cannot get error when a value exists!" ) ? static_cast<void> (0) : __assert_fail ("HasError && \"Cannot get error when a value exists!\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 642, __PRETTY_FUNCTION__)); | |||
643 | return reinterpret_cast<const error_type *>(ErrorStorage.buffer); | |||
644 | } | |||
645 | ||||
646 | // Used by ExpectedAsOutParameter to reset the checked flag. | |||
647 | void setUnchecked() { | |||
648 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
649 | Unchecked = true; | |||
650 | #endif | |||
651 | } | |||
652 | ||||
653 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
654 | LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn)) | |||
655 | LLVM_ATTRIBUTE_NOINLINE__attribute__((noinline)) | |||
656 | void fatalUncheckedExpected() const { | |||
657 | dbgs() << "Expected<T> must be checked before access or destruction.\n"; | |||
658 | if (HasError) { | |||
659 | dbgs() << "Unchecked Expected<T> contained error:\n"; | |||
660 | (*getErrorStorage())->log(dbgs()); | |||
661 | } else | |||
662 | dbgs() << "Expected<T> value was in success state. (Note: Expected<T> " | |||
663 | "values in success mode must still be checked prior to being " | |||
664 | "destroyed).\n"; | |||
665 | abort(); | |||
666 | } | |||
667 | #endif | |||
668 | ||||
669 | void assertIsChecked() { | |||
670 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
671 | if (LLVM_UNLIKELY(Unchecked)__builtin_expect((bool)(Unchecked), false)) | |||
672 | fatalUncheckedExpected(); | |||
673 | #endif | |||
674 | } | |||
675 | ||||
676 | union { | |||
677 | AlignedCharArrayUnion<storage_type> TStorage; | |||
678 | AlignedCharArrayUnion<error_type> ErrorStorage; | |||
679 | }; | |||
680 | bool HasError : 1; | |||
681 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
682 | bool Unchecked : 1; | |||
683 | #endif | |||
684 | }; | |||
685 | ||||
686 | /// Report a serious error, calling any installed error handler. See | |||
687 | /// ErrorHandling.h. | |||
688 | LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn)) void report_fatal_error(Error Err, | |||
689 | bool gen_crash_diag = true); | |||
690 | ||||
691 | /// Report a fatal error if Err is a failure value. | |||
692 | /// | |||
693 | /// This function can be used to wrap calls to fallible functions ONLY when it | |||
694 | /// is known that the Error will always be a success value. E.g. | |||
695 | /// | |||
696 | /// @code{.cpp} | |||
697 | /// // foo only attempts the fallible operation if DoFallibleOperation is | |||
698 | /// // true. If DoFallibleOperation is false then foo always returns | |||
699 | /// // Error::success(). | |||
700 | /// Error foo(bool DoFallibleOperation); | |||
701 | /// | |||
702 | /// cantFail(foo(false)); | |||
703 | /// @endcode | |||
704 | inline void cantFail(Error Err, const char *Msg = nullptr) { | |||
705 | if (Err) { | |||
706 | if (!Msg) | |||
707 | Msg = "Failure value returned from cantFail wrapped call"; | |||
708 | llvm_unreachable(Msg)::llvm::llvm_unreachable_internal(Msg, "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 708); | |||
709 | } | |||
710 | } | |||
711 | ||||
712 | /// Report a fatal error if ValOrErr is a failure value, otherwise unwraps and | |||
713 | /// returns the contained value. | |||
714 | /// | |||
715 | /// This function can be used to wrap calls to fallible functions ONLY when it | |||
716 | /// is known that the Error will always be a success value. E.g. | |||
717 | /// | |||
718 | /// @code{.cpp} | |||
719 | /// // foo only attempts the fallible operation if DoFallibleOperation is | |||
720 | /// // true. If DoFallibleOperation is false then foo always returns an int. | |||
721 | /// Expected<int> foo(bool DoFallibleOperation); | |||
722 | /// | |||
723 | /// int X = cantFail(foo(false)); | |||
724 | /// @endcode | |||
725 | template <typename T> | |||
726 | T cantFail(Expected<T> ValOrErr, const char *Msg = nullptr) { | |||
727 | if (ValOrErr) | |||
728 | return std::move(*ValOrErr); | |||
729 | else { | |||
730 | if (!Msg) | |||
731 | Msg = "Failure value returned from cantFail wrapped call"; | |||
732 | llvm_unreachable(Msg)::llvm::llvm_unreachable_internal(Msg, "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 732); | |||
733 | } | |||
734 | } | |||
735 | ||||
736 | /// Report a fatal error if ValOrErr is a failure value, otherwise unwraps and | |||
737 | /// returns the contained reference. | |||
738 | /// | |||
739 | /// This function can be used to wrap calls to fallible functions ONLY when it | |||
740 | /// is known that the Error will always be a success value. E.g. | |||
741 | /// | |||
742 | /// @code{.cpp} | |||
743 | /// // foo only attempts the fallible operation if DoFallibleOperation is | |||
744 | /// // true. If DoFallibleOperation is false then foo always returns a Bar&. | |||
745 | /// Expected<Bar&> foo(bool DoFallibleOperation); | |||
746 | /// | |||
747 | /// Bar &X = cantFail(foo(false)); | |||
748 | /// @endcode | |||
749 | template <typename T> | |||
750 | T& cantFail(Expected<T&> ValOrErr, const char *Msg = nullptr) { | |||
751 | if (ValOrErr) | |||
752 | return *ValOrErr; | |||
753 | else { | |||
754 | if (!Msg) | |||
755 | Msg = "Failure value returned from cantFail wrapped call"; | |||
756 | llvm_unreachable(Msg)::llvm::llvm_unreachable_internal(Msg, "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 756); | |||
757 | } | |||
758 | } | |||
759 | ||||
760 | /// Helper for testing applicability of, and applying, handlers for | |||
761 | /// ErrorInfo types. | |||
762 | template <typename HandlerT> | |||
763 | class ErrorHandlerTraits | |||
764 | : public ErrorHandlerTraits<decltype( | |||
765 | &std::remove_reference<HandlerT>::type::operator())> {}; | |||
766 | ||||
767 | // Specialization functions of the form 'Error (const ErrT&)'. | |||
768 | template <typename ErrT> class ErrorHandlerTraits<Error (&)(ErrT &)> { | |||
769 | public: | |||
770 | static bool appliesTo(const ErrorInfoBase &E) { | |||
771 | return E.template isA<ErrT>(); | |||
772 | } | |||
773 | ||||
774 | template <typename HandlerT> | |||
775 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
776 | assert(appliesTo(*E) && "Applying incorrect handler")((appliesTo(*E) && "Applying incorrect handler") ? static_cast <void> (0) : __assert_fail ("appliesTo(*E) && \"Applying incorrect handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 776, __PRETTY_FUNCTION__)); | |||
777 | return H(static_cast<ErrT &>(*E)); | |||
778 | } | |||
779 | }; | |||
780 | ||||
781 | // Specialization functions of the form 'void (const ErrT&)'. | |||
782 | template <typename ErrT> class ErrorHandlerTraits<void (&)(ErrT &)> { | |||
783 | public: | |||
784 | static bool appliesTo(const ErrorInfoBase &E) { | |||
785 | return E.template isA<ErrT>(); | |||
786 | } | |||
787 | ||||
788 | template <typename HandlerT> | |||
789 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
790 | assert(appliesTo(*E) && "Applying incorrect handler")((appliesTo(*E) && "Applying incorrect handler") ? static_cast <void> (0) : __assert_fail ("appliesTo(*E) && \"Applying incorrect handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 790, __PRETTY_FUNCTION__)); | |||
791 | H(static_cast<ErrT &>(*E)); | |||
792 | return Error::success(); | |||
793 | } | |||
794 | }; | |||
795 | ||||
796 | /// Specialization for functions of the form 'Error (std::unique_ptr<ErrT>)'. | |||
797 | template <typename ErrT> | |||
798 | class ErrorHandlerTraits<Error (&)(std::unique_ptr<ErrT>)> { | |||
799 | public: | |||
800 | static bool appliesTo(const ErrorInfoBase &E) { | |||
801 | return E.template isA<ErrT>(); | |||
802 | } | |||
803 | ||||
804 | template <typename HandlerT> | |||
805 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
806 | assert(appliesTo(*E) && "Applying incorrect handler")((appliesTo(*E) && "Applying incorrect handler") ? static_cast <void> (0) : __assert_fail ("appliesTo(*E) && \"Applying incorrect handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 806, __PRETTY_FUNCTION__)); | |||
807 | std::unique_ptr<ErrT> SubE(static_cast<ErrT *>(E.release())); | |||
808 | return H(std::move(SubE)); | |||
809 | } | |||
810 | }; | |||
811 | ||||
812 | /// Specialization for functions of the form 'void (std::unique_ptr<ErrT>)'. | |||
813 | template <typename ErrT> | |||
814 | class ErrorHandlerTraits<void (&)(std::unique_ptr<ErrT>)> { | |||
815 | public: | |||
816 | static bool appliesTo(const ErrorInfoBase &E) { | |||
817 | return E.template isA<ErrT>(); | |||
818 | } | |||
819 | ||||
820 | template <typename HandlerT> | |||
821 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
822 | assert(appliesTo(*E) && "Applying incorrect handler")((appliesTo(*E) && "Applying incorrect handler") ? static_cast <void> (0) : __assert_fail ("appliesTo(*E) && \"Applying incorrect handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 822, __PRETTY_FUNCTION__)); | |||
823 | std::unique_ptr<ErrT> SubE(static_cast<ErrT *>(E.release())); | |||
824 | H(std::move(SubE)); | |||
825 | return Error::success(); | |||
826 | } | |||
827 | }; | |||
828 | ||||
829 | // Specialization for member functions of the form 'RetT (const ErrT&)'. | |||
830 | template <typename C, typename RetT, typename ErrT> | |||
831 | class ErrorHandlerTraits<RetT (C::*)(ErrT &)> | |||
832 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
833 | ||||
834 | // Specialization for member functions of the form 'RetT (const ErrT&) const'. | |||
835 | template <typename C, typename RetT, typename ErrT> | |||
836 | class ErrorHandlerTraits<RetT (C::*)(ErrT &) const> | |||
837 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
838 | ||||
839 | // Specialization for member functions of the form 'RetT (const ErrT&)'. | |||
840 | template <typename C, typename RetT, typename ErrT> | |||
841 | class ErrorHandlerTraits<RetT (C::*)(const ErrT &)> | |||
842 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
843 | ||||
844 | // Specialization for member functions of the form 'RetT (const ErrT&) const'. | |||
845 | template <typename C, typename RetT, typename ErrT> | |||
846 | class ErrorHandlerTraits<RetT (C::*)(const ErrT &) const> | |||
847 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
848 | ||||
849 | /// Specialization for member functions of the form | |||
850 | /// 'RetT (std::unique_ptr<ErrT>)'. | |||
851 | template <typename C, typename RetT, typename ErrT> | |||
852 | class ErrorHandlerTraits<RetT (C::*)(std::unique_ptr<ErrT>)> | |||
853 | : public ErrorHandlerTraits<RetT (&)(std::unique_ptr<ErrT>)> {}; | |||
854 | ||||
855 | /// Specialization for member functions of the form | |||
856 | /// 'RetT (std::unique_ptr<ErrT>) const'. | |||
857 | template <typename C, typename RetT, typename ErrT> | |||
858 | class ErrorHandlerTraits<RetT (C::*)(std::unique_ptr<ErrT>) const> | |||
859 | : public ErrorHandlerTraits<RetT (&)(std::unique_ptr<ErrT>)> {}; | |||
860 | ||||
861 | inline Error handleErrorImpl(std::unique_ptr<ErrorInfoBase> Payload) { | |||
862 | return Error(std::move(Payload)); | |||
863 | } | |||
864 | ||||
865 | template <typename HandlerT, typename... HandlerTs> | |||
866 | Error handleErrorImpl(std::unique_ptr<ErrorInfoBase> Payload, | |||
867 | HandlerT &&Handler, HandlerTs &&... Handlers) { | |||
868 | if (ErrorHandlerTraits<HandlerT>::appliesTo(*Payload)) | |||
869 | return ErrorHandlerTraits<HandlerT>::apply(std::forward<HandlerT>(Handler), | |||
870 | std::move(Payload)); | |||
871 | return handleErrorImpl(std::move(Payload), | |||
872 | std::forward<HandlerTs>(Handlers)...); | |||
873 | } | |||
874 | ||||
875 | /// Pass the ErrorInfo(s) contained in E to their respective handlers. Any | |||
876 | /// unhandled errors (or Errors returned by handlers) are re-concatenated and | |||
877 | /// returned. | |||
878 | /// Because this function returns an error, its result must also be checked | |||
879 | /// or returned. If you intend to handle all errors use handleAllErrors | |||
880 | /// (which returns void, and will abort() on unhandled errors) instead. | |||
881 | template <typename... HandlerTs> | |||
882 | Error handleErrors(Error E, HandlerTs &&... Hs) { | |||
883 | if (!E) | |||
884 | return Error::success(); | |||
885 | ||||
886 | std::unique_ptr<ErrorInfoBase> Payload = E.takePayload(); | |||
887 | ||||
888 | if (Payload->isA<ErrorList>()) { | |||
889 | ErrorList &List = static_cast<ErrorList &>(*Payload); | |||
890 | Error R; | |||
891 | for (auto &P : List.Payloads) | |||
892 | R = ErrorList::join( | |||
893 | std::move(R), | |||
894 | handleErrorImpl(std::move(P), std::forward<HandlerTs>(Hs)...)); | |||
895 | return R; | |||
896 | } | |||
897 | ||||
898 | return handleErrorImpl(std::move(Payload), std::forward<HandlerTs>(Hs)...); | |||
899 | } | |||
900 | ||||
901 | /// Behaves the same as handleErrors, except that by contract all errors | |||
902 | /// *must* be handled by the given handlers (i.e. there must be no remaining | |||
903 | /// errors after running the handlers, or llvm_unreachable is called). | |||
904 | template <typename... HandlerTs> | |||
905 | void handleAllErrors(Error E, HandlerTs &&... Handlers) { | |||
906 | cantFail(handleErrors(std::move(E), std::forward<HandlerTs>(Handlers)...)); | |||
907 | } | |||
908 | ||||
909 | /// Check that E is a non-error, then drop it. | |||
910 | /// If E is an error, llvm_unreachable will be called. | |||
911 | inline void handleAllErrors(Error E) { | |||
912 | cantFail(std::move(E)); | |||
913 | } | |||
914 | ||||
915 | /// Handle any errors (if present) in an Expected<T>, then try a recovery path. | |||
916 | /// | |||
917 | /// If the incoming value is a success value it is returned unmodified. If it | |||
918 | /// is a failure value then it the contained error is passed to handleErrors. | |||
919 | /// If handleErrors is able to handle the error then the RecoveryPath functor | |||
920 | /// is called to supply the final result. If handleErrors is not able to | |||
921 | /// handle all errors then the unhandled errors are returned. | |||
922 | /// | |||
923 | /// This utility enables the follow pattern: | |||
924 | /// | |||
925 | /// @code{.cpp} | |||
926 | /// enum FooStrategy { Aggressive, Conservative }; | |||
927 | /// Expected<Foo> foo(FooStrategy S); | |||
928 | /// | |||
929 | /// auto ResultOrErr = | |||
930 | /// handleExpected( | |||
931 | /// foo(Aggressive), | |||
932 | /// []() { return foo(Conservative); }, | |||
933 | /// [](AggressiveStrategyError&) { | |||
934 | /// // Implicitly conusme this - we'll recover by using a conservative | |||
935 | /// // strategy. | |||
936 | /// }); | |||
937 | /// | |||
938 | /// @endcode | |||
939 | template <typename T, typename RecoveryFtor, typename... HandlerTs> | |||
940 | Expected<T> handleExpected(Expected<T> ValOrErr, RecoveryFtor &&RecoveryPath, | |||
941 | HandlerTs &&... Handlers) { | |||
942 | if (ValOrErr) | |||
943 | return ValOrErr; | |||
944 | ||||
945 | if (auto Err = handleErrors(ValOrErr.takeError(), | |||
946 | std::forward<HandlerTs>(Handlers)...)) | |||
947 | return std::move(Err); | |||
948 | ||||
949 | return RecoveryPath(); | |||
950 | } | |||
951 | ||||
952 | /// Log all errors (if any) in E to OS. If there are any errors, ErrorBanner | |||
953 | /// will be printed before the first one is logged. A newline will be printed | |||
954 | /// after each error. | |||
955 | /// | |||
956 | /// This is useful in the base level of your program to allow clean termination | |||
957 | /// (allowing clean deallocation of resources, etc.), while reporting error | |||
958 | /// information to the user. | |||
959 | void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner); | |||
960 | ||||
961 | /// Write all error messages (if any) in E to a string. The newline character | |||
962 | /// is used to separate error messages. | |||
963 | inline std::string toString(Error E) { | |||
964 | SmallVector<std::string, 2> Errors; | |||
965 | handleAllErrors(std::move(E), [&Errors](const ErrorInfoBase &EI) { | |||
966 | Errors.push_back(EI.message()); | |||
967 | }); | |||
968 | return join(Errors.begin(), Errors.end(), "\n"); | |||
969 | } | |||
970 | ||||
971 | /// Consume a Error without doing anything. This method should be used | |||
972 | /// only where an error can be considered a reasonable and expected return | |||
973 | /// value. | |||
974 | /// | |||
975 | /// Uses of this method are potentially indicative of design problems: If it's | |||
976 | /// legitimate to do nothing while processing an "error", the error-producer | |||
977 | /// might be more clearly refactored to return an Optional<T>. | |||
978 | inline void consumeError(Error Err) { | |||
979 | handleAllErrors(std::move(Err), [](const ErrorInfoBase &) {}); | |||
980 | } | |||
981 | ||||
982 | /// Helper for converting an Error to a bool. | |||
983 | /// | |||
984 | /// This method returns true if Err is in an error state, or false if it is | |||
985 | /// in a success state. Puts Err in a checked state in both cases (unlike | |||
986 | /// Error::operator bool(), which only does this for success states). | |||
987 | inline bool errorToBool(Error Err) { | |||
988 | bool IsError = static_cast<bool>(Err); | |||
989 | if (IsError) | |||
990 | consumeError(std::move(Err)); | |||
991 | return IsError; | |||
992 | } | |||
993 | ||||
994 | /// Helper for Errors used as out-parameters. | |||
995 | /// | |||
996 | /// This helper is for use with the Error-as-out-parameter idiom, where an error | |||
997 | /// is passed to a function or method by reference, rather than being returned. | |||
998 | /// In such cases it is helpful to set the checked bit on entry to the function | |||
999 | /// so that the error can be written to (unchecked Errors abort on assignment) | |||
1000 | /// and clear the checked bit on exit so that clients cannot accidentally forget | |||
1001 | /// to check the result. This helper performs these actions automatically using | |||
1002 | /// RAII: | |||
1003 | /// | |||
1004 | /// @code{.cpp} | |||
1005 | /// Result foo(Error &Err) { | |||
1006 | /// ErrorAsOutParameter ErrAsOutParam(&Err); // 'Checked' flag set | |||
1007 | /// // <body of foo> | |||
1008 | /// // <- 'Checked' flag auto-cleared when ErrAsOutParam is destructed. | |||
1009 | /// } | |||
1010 | /// @endcode | |||
1011 | /// | |||
1012 | /// ErrorAsOutParameter takes an Error* rather than Error& so that it can be | |||
1013 | /// used with optional Errors (Error pointers that are allowed to be null). If | |||
1014 | /// ErrorAsOutParameter took an Error reference, an instance would have to be | |||
1015 | /// created inside every condition that verified that Error was non-null. By | |||
1016 | /// taking an Error pointer we can just create one instance at the top of the | |||
1017 | /// function. | |||
1018 | class ErrorAsOutParameter { | |||
1019 | public: | |||
1020 | ErrorAsOutParameter(Error *Err) : Err(Err) { | |||
1021 | // Raise the checked bit if Err is success. | |||
1022 | if (Err) | |||
1023 | (void)!!*Err; | |||
1024 | } | |||
1025 | ||||
1026 | ~ErrorAsOutParameter() { | |||
1027 | // Clear the checked bit. | |||
1028 | if (Err && !*Err) | |||
1029 | *Err = Error::success(); | |||
1030 | } | |||
1031 | ||||
1032 | private: | |||
1033 | Error *Err; | |||
1034 | }; | |||
1035 | ||||
1036 | /// Helper for Expected<T>s used as out-parameters. | |||
1037 | /// | |||
1038 | /// See ErrorAsOutParameter. | |||
1039 | template <typename T> | |||
1040 | class ExpectedAsOutParameter { | |||
1041 | public: | |||
1042 | ExpectedAsOutParameter(Expected<T> *ValOrErr) | |||
1043 | : ValOrErr(ValOrErr) { | |||
1044 | if (ValOrErr) | |||
1045 | (void)!!*ValOrErr; | |||
1046 | } | |||
1047 | ||||
1048 | ~ExpectedAsOutParameter() { | |||
1049 | if (ValOrErr) | |||
1050 | ValOrErr->setUnchecked(); | |||
1051 | } | |||
1052 | ||||
1053 | private: | |||
1054 | Expected<T> *ValOrErr; | |||
1055 | }; | |||
1056 | ||||
1057 | /// This class wraps a std::error_code in a Error. | |||
1058 | /// | |||
1059 | /// This is useful if you're writing an interface that returns a Error | |||
1060 | /// (or Expected) and you want to call code that still returns | |||
1061 | /// std::error_codes. | |||
1062 | class ECError : public ErrorInfo<ECError> { | |||
1063 | friend Error errorCodeToError(std::error_code); | |||
1064 | ||||
1065 | public: | |||
1066 | void setErrorCode(std::error_code EC) { this->EC = EC; } | |||
1067 | std::error_code convertToErrorCode() const override { return EC; } | |||
1068 | void log(raw_ostream &OS) const override { OS << EC.message(); } | |||
1069 | ||||
1070 | // Used by ErrorInfo::classID. | |||
1071 | static char ID; | |||
1072 | ||||
1073 | protected: | |||
1074 | ECError() = default; | |||
1075 | ECError(std::error_code EC) : EC(EC) {} | |||
1076 | ||||
1077 | std::error_code EC; | |||
1078 | }; | |||
1079 | ||||
1080 | /// The value returned by this function can be returned from convertToErrorCode | |||
1081 | /// for Error values where no sensible translation to std::error_code exists. | |||
1082 | /// It should only be used in this situation, and should never be used where a | |||
1083 | /// sensible conversion to std::error_code is available, as attempts to convert | |||
1084 | /// to/from this error will result in a fatal error. (i.e. it is a programmatic | |||
1085 | ///error to try to convert such a value). | |||
1086 | std::error_code inconvertibleErrorCode(); | |||
1087 | ||||
1088 | /// Helper for converting an std::error_code to a Error. | |||
1089 | Error errorCodeToError(std::error_code EC); | |||
1090 | ||||
1091 | /// Helper for converting an ECError to a std::error_code. | |||
1092 | /// | |||
1093 | /// This method requires that Err be Error() or an ECError, otherwise it | |||
1094 | /// will trigger a call to abort(). | |||
1095 | std::error_code errorToErrorCode(Error Err); | |||
1096 | ||||
1097 | /// Convert an ErrorOr<T> to an Expected<T>. | |||
1098 | template <typename T> Expected<T> errorOrToExpected(ErrorOr<T> &&EO) { | |||
1099 | if (auto EC = EO.getError()) | |||
1100 | return errorCodeToError(EC); | |||
1101 | return std::move(*EO); | |||
1102 | } | |||
1103 | ||||
1104 | /// Convert an Expected<T> to an ErrorOr<T>. | |||
1105 | template <typename T> ErrorOr<T> expectedToErrorOr(Expected<T> &&E) { | |||
1106 | if (auto Err = E.takeError()) | |||
1107 | return errorToErrorCode(std::move(Err)); | |||
1108 | return std::move(*E); | |||
1109 | } | |||
1110 | ||||
1111 | /// This class wraps a string in an Error. | |||
1112 | /// | |||
1113 | /// StringError is useful in cases where the client is not expected to be able | |||
1114 | /// to consume the specific error message programmatically (for example, if the | |||
1115 | /// error message is to be presented to the user). | |||
1116 | /// | |||
1117 | /// StringError can also be used when additional information is to be printed | |||
1118 | /// along with a error_code message. Depending on the constructor called, this | |||
1119 | /// class can either display: | |||
1120 | /// 1. the error_code message (ECError behavior) | |||
1121 | /// 2. a string | |||
1122 | /// 3. the error_code message and a string | |||
1123 | /// | |||
1124 | /// These behaviors are useful when subtyping is required; for example, when a | |||
1125 | /// specific library needs an explicit error type. In the example below, | |||
1126 | /// PDBError is derived from StringError: | |||
1127 | /// | |||
1128 | /// @code{.cpp} | |||
1129 | /// Expected<int> foo() { | |||
1130 | /// return llvm::make_error<PDBError>(pdb_error_code::dia_failed_loading, | |||
1131 | /// "Additional information"); | |||
1132 | /// } | |||
1133 | /// @endcode | |||
1134 | /// | |||
1135 | class StringError : public ErrorInfo<StringError> { | |||
1136 | public: | |||
1137 | static char ID; | |||
1138 | ||||
1139 | // Prints EC + S and converts to EC | |||
1140 | StringError(std::error_code EC, const Twine &S = Twine()); | |||
1141 | ||||
1142 | // Prints S and converts to EC | |||
1143 | StringError(const Twine &S, std::error_code EC); | |||
1144 | ||||
1145 | void log(raw_ostream &OS) const override; | |||
1146 | std::error_code convertToErrorCode() const override; | |||
1147 | ||||
1148 | const std::string &getMessage() const { return Msg; } | |||
1149 | ||||
1150 | private: | |||
1151 | std::string Msg; | |||
1152 | std::error_code EC; | |||
1153 | const bool PrintMsgOnly = false; | |||
1154 | }; | |||
1155 | ||||
1156 | /// Create formatted StringError object. | |||
1157 | template <typename... Ts> | |||
1158 | Error createStringError(std::error_code EC, char const *Fmt, | |||
1159 | const Ts &... Vals) { | |||
1160 | std::string Buffer; | |||
1161 | raw_string_ostream Stream(Buffer); | |||
1162 | Stream << format(Fmt, Vals...); | |||
1163 | return make_error<StringError>(Stream.str(), EC); | |||
1164 | } | |||
1165 | ||||
1166 | Error createStringError(std::error_code EC, char const *Msg); | |||
1167 | ||||
1168 | /// This class wraps a filename and another Error. | |||
1169 | /// | |||
1170 | /// In some cases, an error needs to live along a 'source' name, in order to | |||
1171 | /// show more detailed information to the user. | |||
1172 | class FileError final : public ErrorInfo<FileError> { | |||
1173 | ||||
1174 | friend Error createFileError(std::string, Error); | |||
1175 | ||||
1176 | public: | |||
1177 | void log(raw_ostream &OS) const override { | |||
1178 | assert(Err && !FileName.empty() && "Trying to log after takeError().")((Err && !FileName.empty() && "Trying to log after takeError()." ) ? static_cast<void> (0) : __assert_fail ("Err && !FileName.empty() && \"Trying to log after takeError().\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 1178, __PRETTY_FUNCTION__)); | |||
1179 | OS << "'" << FileName << "': "; | |||
1180 | Err->log(OS); | |||
1181 | } | |||
1182 | ||||
1183 | Error takeError() { return Error(std::move(Err)); } | |||
1184 | ||||
1185 | std::error_code convertToErrorCode() const override; | |||
1186 | ||||
1187 | // Used by ErrorInfo::classID. | |||
1188 | static char ID; | |||
1189 | ||||
1190 | private: | |||
1191 | FileError(std::string F, std::unique_ptr<ErrorInfoBase> E) { | |||
1192 | assert(E && "Cannot create FileError from Error success value.")((E && "Cannot create FileError from Error success value." ) ? static_cast<void> (0) : __assert_fail ("E && \"Cannot create FileError from Error success value.\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 1192, __PRETTY_FUNCTION__)); | |||
1193 | assert(!F.empty() &&((!F.empty() && "The file name provided to FileError must not be empty." ) ? static_cast<void> (0) : __assert_fail ("!F.empty() && \"The file name provided to FileError must not be empty.\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 1194, __PRETTY_FUNCTION__)) | |||
1194 | "The file name provided to FileError must not be empty.")((!F.empty() && "The file name provided to FileError must not be empty." ) ? static_cast<void> (0) : __assert_fail ("!F.empty() && \"The file name provided to FileError must not be empty.\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/Support/Error.h" , 1194, __PRETTY_FUNCTION__)); | |||
1195 | FileName = F; | |||
1196 | Err = std::move(E); | |||
1197 | } | |||
1198 | ||||
1199 | static Error build(std::string F, Error E) { | |||
1200 | return Error(std::unique_ptr<FileError>(new FileError(F, E.takePayload()))); | |||
1201 | } | |||
1202 | ||||
1203 | std::string FileName; | |||
1204 | std::unique_ptr<ErrorInfoBase> Err; | |||
1205 | }; | |||
1206 | ||||
1207 | /// Concatenate a source file path and/or name with an Error. The resulting | |||
1208 | /// Error is unchecked. | |||
1209 | inline Error createFileError(std::string F, Error E) { | |||
1210 | return FileError::build(F, std::move(E)); | |||
1211 | } | |||
1212 | ||||
1213 | Error createFileError(std::string F, ErrorSuccess) = delete; | |||
1214 | ||||
1215 | /// Helper for check-and-exit error handling. | |||
1216 | /// | |||
1217 | /// For tool use only. NOT FOR USE IN LIBRARY CODE. | |||
1218 | /// | |||
1219 | class ExitOnError { | |||
1220 | public: | |||
1221 | /// Create an error on exit helper. | |||
1222 | ExitOnError(std::string Banner = "", int DefaultErrorExitCode = 1) | |||
1223 | : Banner(std::move(Banner)), | |||
1224 | GetExitCode([=](const Error &) { return DefaultErrorExitCode; }) {} | |||
1225 | ||||
1226 | /// Set the banner string for any errors caught by operator(). | |||
1227 | void setBanner(std::string Banner) { this->Banner = std::move(Banner); } | |||
1228 | ||||
1229 | /// Set the exit-code mapper function. | |||
1230 | void setExitCodeMapper(std::function<int(const Error &)> GetExitCode) { | |||
1231 | this->GetExitCode = std::move(GetExitCode); | |||
1232 | } | |||
1233 | ||||
1234 | /// Check Err. If it's in a failure state log the error(s) and exit. | |||
1235 | void operator()(Error Err) const { checkError(std::move(Err)); } | |||
1236 | ||||
1237 | /// Check E. If it's in a success state then return the contained value. If | |||
1238 | /// it's in a failure state log the error(s) and exit. | |||
1239 | template <typename T> T operator()(Expected<T> &&E) const { | |||
1240 | checkError(E.takeError()); | |||
1241 | return std::move(*E); | |||
1242 | } | |||
1243 | ||||
1244 | /// Check E. If it's in a success state then return the contained reference. If | |||
1245 | /// it's in a failure state log the error(s) and exit. | |||
1246 | template <typename T> T& operator()(Expected<T&> &&E) const { | |||
1247 | checkError(E.takeError()); | |||
1248 | return *E; | |||
1249 | } | |||
1250 | ||||
1251 | private: | |||
1252 | void checkError(Error Err) const { | |||
1253 | if (Err) { | |||
1254 | int ExitCode = GetExitCode(Err); | |||
1255 | logAllUnhandledErrors(std::move(Err), errs(), Banner); | |||
1256 | exit(ExitCode); | |||
1257 | } | |||
1258 | } | |||
1259 | ||||
1260 | std::string Banner; | |||
1261 | std::function<int(const Error &)> GetExitCode; | |||
1262 | }; | |||
1263 | ||||
1264 | /// Conversion from Error to LLVMErrorRef for C error bindings. | |||
1265 | inline LLVMErrorRef wrap(Error Err) { | |||
1266 | return reinterpret_cast<LLVMErrorRef>(Err.takePayload().release()); | |||
1267 | } | |||
1268 | ||||
1269 | /// Conversion from LLVMErrorRef to Error for C error bindings. | |||
1270 | inline Error unwrap(LLVMErrorRef ErrRef) { | |||
1271 | return Error(std::unique_ptr<ErrorInfoBase>( | |||
1272 | reinterpret_cast<ErrorInfoBase *>(ErrRef))); | |||
1273 | } | |||
1274 | ||||
1275 | } // end namespace llvm | |||
1276 | ||||
1277 | #endif // LLVM_SUPPORT_ERROR_H |
1 | //===- llvm/ADT/STLExtras.h - Useful STL related functions ------*- C++ -*-===// |
2 | // |
3 | // The LLVM Compiler Infrastructure |
4 | // |
5 | // This file is distributed under the University of Illinois Open Source |
6 | // License. See LICENSE.TXT for details. |
7 | // |
8 | //===----------------------------------------------------------------------===// |
9 | // |
10 | // This file contains some templates that are useful if you are working with the |
11 | // STL at all. |
12 | // |
13 | // No library is required when using these functions. |
14 | // |
15 | //===----------------------------------------------------------------------===// |
16 | |
17 | #ifndef LLVM_ADT_STLEXTRAS_H |
18 | #define LLVM_ADT_STLEXTRAS_H |
19 | |
20 | #include "llvm/ADT/Optional.h" |
21 | #include "llvm/ADT/SmallVector.h" |
22 | #include "llvm/ADT/iterator.h" |
23 | #include "llvm/ADT/iterator_range.h" |
24 | #include "llvm/Config/abi-breaking.h" |
25 | #include "llvm/Support/ErrorHandling.h" |
26 | #include <algorithm> |
27 | #include <cassert> |
28 | #include <cstddef> |
29 | #include <cstdint> |
30 | #include <cstdlib> |
31 | #include <functional> |
32 | #include <initializer_list> |
33 | #include <iterator> |
34 | #include <limits> |
35 | #include <memory> |
36 | #include <tuple> |
37 | #include <type_traits> |
38 | #include <utility> |
39 | |
40 | #ifdef EXPENSIVE_CHECKS |
41 | #include <random> // for std::mt19937 |
42 | #endif |
43 | |
44 | namespace llvm { |
45 | |
46 | // Only used by compiler if both template types are the same. Useful when |
47 | // using SFINAE to test for the existence of member functions. |
48 | template <typename T, T> struct SameType; |
49 | |
50 | namespace detail { |
51 | |
52 | template <typename RangeT> |
53 | using IterOfRange = decltype(std::begin(std::declval<RangeT &>())); |
54 | |
55 | template <typename RangeT> |
56 | using ValueOfRange = typename std::remove_reference<decltype( |
57 | *std::begin(std::declval<RangeT &>()))>::type; |
58 | |
59 | } // end namespace detail |
60 | |
61 | //===----------------------------------------------------------------------===// |
62 | // Extra additions to <type_traits> |
63 | //===----------------------------------------------------------------------===// |
64 | |
65 | template <typename T> |
66 | struct negation : std::integral_constant<bool, !bool(T::value)> {}; |
67 | |
68 | template <typename...> struct conjunction : std::true_type {}; |
69 | template <typename B1> struct conjunction<B1> : B1 {}; |
70 | template <typename B1, typename... Bn> |
71 | struct conjunction<B1, Bn...> |
72 | : std::conditional<bool(B1::value), conjunction<Bn...>, B1>::type {}; |
73 | |
74 | //===----------------------------------------------------------------------===// |
75 | // Extra additions to <functional> |
76 | //===----------------------------------------------------------------------===// |
77 | |
78 | template <class Ty> struct identity { |
79 | using argument_type = Ty; |
80 | |
81 | Ty &operator()(Ty &self) const { |
82 | return self; |
83 | } |
84 | const Ty &operator()(const Ty &self) const { |
85 | return self; |
86 | } |
87 | }; |
88 | |
89 | template <class Ty> struct less_ptr { |
90 | bool operator()(const Ty* left, const Ty* right) const { |
91 | return *left < *right; |
92 | } |
93 | }; |
94 | |
95 | template <class Ty> struct greater_ptr { |
96 | bool operator()(const Ty* left, const Ty* right) const { |
97 | return *right < *left; |
98 | } |
99 | }; |
100 | |
101 | /// An efficient, type-erasing, non-owning reference to a callable. This is |
102 | /// intended for use as the type of a function parameter that is not used |
103 | /// after the function in question returns. |
104 | /// |
105 | /// This class does not own the callable, so it is not in general safe to store |
106 | /// a function_ref. |
107 | template<typename Fn> class function_ref; |
108 | |
109 | template<typename Ret, typename ...Params> |
110 | class function_ref<Ret(Params...)> { |
111 | Ret (*callback)(intptr_t callable, Params ...params) = nullptr; |
112 | intptr_t callable; |
113 | |
114 | template<typename Callable> |
115 | static Ret callback_fn(intptr_t callable, Params ...params) { |
116 | return (*reinterpret_cast<Callable*>(callable))( |
117 | std::forward<Params>(params)...); |
118 | } |
119 | |
120 | public: |
121 | function_ref() = default; |
122 | function_ref(std::nullptr_t) {} |
123 | |
124 | template <typename Callable> |
125 | function_ref(Callable &&callable, |
126 | typename std::enable_if< |
127 | !std::is_same<typename std::remove_reference<Callable>::type, |
128 | function_ref>::value>::type * = nullptr) |
129 | : callback(callback_fn<typename std::remove_reference<Callable>::type>), |
130 | callable(reinterpret_cast<intptr_t>(&callable)) {} |
131 | |
132 | Ret operator()(Params ...params) const { |
133 | return callback(callable, std::forward<Params>(params)...); |
134 | } |
135 | |
136 | operator bool() const { return callback; } |
137 | }; |
138 | |
139 | // deleter - Very very very simple method that is used to invoke operator |
140 | // delete on something. It is used like this: |
141 | // |
142 | // for_each(V.begin(), B.end(), deleter<Interval>); |
143 | template <class T> |
144 | inline void deleter(T *Ptr) { |
145 | delete Ptr; |
146 | } |
147 | |
148 | //===----------------------------------------------------------------------===// |
149 | // Extra additions to <iterator> |
150 | //===----------------------------------------------------------------------===// |
151 | |
152 | namespace adl_detail { |
153 | |
154 | using std::begin; |
155 | |
156 | template <typename ContainerTy> |
157 | auto adl_begin(ContainerTy &&container) |
158 | -> decltype(begin(std::forward<ContainerTy>(container))) { |
159 | return begin(std::forward<ContainerTy>(container)); |
160 | } |
161 | |
162 | using std::end; |
163 | |
164 | template <typename ContainerTy> |
165 | auto adl_end(ContainerTy &&container) |
166 | -> decltype(end(std::forward<ContainerTy>(container))) { |
167 | return end(std::forward<ContainerTy>(container)); |
168 | } |
169 | |
170 | using std::swap; |
171 | |
172 | template <typename T> |
173 | void adl_swap(T &&lhs, T &&rhs) noexcept(noexcept(swap(std::declval<T>(), |
174 | std::declval<T>()))) { |
175 | swap(std::forward<T>(lhs), std::forward<T>(rhs)); |
176 | } |
177 | |
178 | } // end namespace adl_detail |
179 | |
180 | template <typename ContainerTy> |
181 | auto adl_begin(ContainerTy &&container) |
182 | -> decltype(adl_detail::adl_begin(std::forward<ContainerTy>(container))) { |
183 | return adl_detail::adl_begin(std::forward<ContainerTy>(container)); |
184 | } |
185 | |
186 | template <typename ContainerTy> |
187 | auto adl_end(ContainerTy &&container) |
188 | -> decltype(adl_detail::adl_end(std::forward<ContainerTy>(container))) { |
189 | return adl_detail::adl_end(std::forward<ContainerTy>(container)); |
190 | } |
191 | |
192 | template <typename T> |
193 | void adl_swap(T &&lhs, T &&rhs) noexcept( |
194 | noexcept(adl_detail::adl_swap(std::declval<T>(), std::declval<T>()))) { |
195 | adl_detail::adl_swap(std::forward<T>(lhs), std::forward<T>(rhs)); |
196 | } |
197 | |
198 | // mapped_iterator - This is a simple iterator adapter that causes a function to |
199 | // be applied whenever operator* is invoked on the iterator. |
200 | |
201 | template <typename ItTy, typename FuncTy, |
202 | typename FuncReturnTy = |
203 | decltype(std::declval<FuncTy>()(*std::declval<ItTy>()))> |
204 | class mapped_iterator |
205 | : public iterator_adaptor_base< |
206 | mapped_iterator<ItTy, FuncTy>, ItTy, |
207 | typename std::iterator_traits<ItTy>::iterator_category, |
208 | typename std::remove_reference<FuncReturnTy>::type> { |
209 | public: |
210 | mapped_iterator(ItTy U, FuncTy F) |
211 | : mapped_iterator::iterator_adaptor_base(std::move(U)), F(std::move(F)) {} |
212 | |
213 | ItTy getCurrent() { return this->I; } |
214 | |
215 | FuncReturnTy operator*() { return F(*this->I); } |
216 | |
217 | private: |
218 | FuncTy F; |
219 | }; |
220 | |
221 | // map_iterator - Provide a convenient way to create mapped_iterators, just like |
222 | // make_pair is useful for creating pairs... |
223 | template <class ItTy, class FuncTy> |
224 | inline mapped_iterator<ItTy, FuncTy> map_iterator(ItTy I, FuncTy F) { |
225 | return mapped_iterator<ItTy, FuncTy>(std::move(I), std::move(F)); |
226 | } |
227 | |
228 | /// Helper to determine if type T has a member called rbegin(). |
229 | template <typename Ty> class has_rbegin_impl { |
230 | using yes = char[1]; |
231 | using no = char[2]; |
232 | |
233 | template <typename Inner> |
234 | static yes& test(Inner *I, decltype(I->rbegin()) * = nullptr); |
235 | |
236 | template <typename> |
237 | static no& test(...); |
238 | |
239 | public: |
240 | static const bool value = sizeof(test<Ty>(nullptr)) == sizeof(yes); |
241 | }; |
242 | |
243 | /// Metafunction to determine if T& or T has a member called rbegin(). |
244 | template <typename Ty> |
245 | struct has_rbegin : has_rbegin_impl<typename std::remove_reference<Ty>::type> { |
246 | }; |
247 | |
248 | // Returns an iterator_range over the given container which iterates in reverse. |
249 | // Note that the container must have rbegin()/rend() methods for this to work. |
250 | template <typename ContainerTy> |
251 | auto reverse(ContainerTy &&C, |
252 | typename std::enable_if<has_rbegin<ContainerTy>::value>::type * = |
253 | nullptr) -> decltype(make_range(C.rbegin(), C.rend())) { |
254 | return make_range(C.rbegin(), C.rend()); |
255 | } |
256 | |
257 | // Returns a std::reverse_iterator wrapped around the given iterator. |
258 | template <typename IteratorTy> |
259 | std::reverse_iterator<IteratorTy> make_reverse_iterator(IteratorTy It) { |
260 | return std::reverse_iterator<IteratorTy>(It); |
261 | } |
262 | |
263 | // Returns an iterator_range over the given container which iterates in reverse. |
264 | // Note that the container must have begin()/end() methods which return |
265 | // bidirectional iterators for this to work. |
266 | template <typename ContainerTy> |
267 | auto reverse( |
268 | ContainerTy &&C, |
269 | typename std::enable_if<!has_rbegin<ContainerTy>::value>::type * = nullptr) |
270 | -> decltype(make_range(llvm::make_reverse_iterator(std::end(C)), |
271 | llvm::make_reverse_iterator(std::begin(C)))) { |
272 | return make_range(llvm::make_reverse_iterator(std::end(C)), |
273 | llvm::make_reverse_iterator(std::begin(C))); |
274 | } |
275 | |
276 | /// An iterator adaptor that filters the elements of given inner iterators. |
277 | /// |
278 | /// The predicate parameter should be a callable object that accepts the wrapped |
279 | /// iterator's reference type and returns a bool. When incrementing or |
280 | /// decrementing the iterator, it will call the predicate on each element and |
281 | /// skip any where it returns false. |
282 | /// |
283 | /// \code |
284 | /// int A[] = { 1, 2, 3, 4 }; |
285 | /// auto R = make_filter_range(A, [](int N) { return N % 2 == 1; }); |
286 | /// // R contains { 1, 3 }. |
287 | /// \endcode |
288 | /// |
289 | /// Note: filter_iterator_base implements support for forward iteration. |
290 | /// filter_iterator_impl exists to provide support for bidirectional iteration, |
291 | /// conditional on whether the wrapped iterator supports it. |
292 | template <typename WrappedIteratorT, typename PredicateT, typename IterTag> |
293 | class filter_iterator_base |
294 | : public iterator_adaptor_base< |
295 | filter_iterator_base<WrappedIteratorT, PredicateT, IterTag>, |
296 | WrappedIteratorT, |
297 | typename std::common_type< |
298 | IterTag, typename std::iterator_traits< |
299 | WrappedIteratorT>::iterator_category>::type> { |
300 | using BaseT = iterator_adaptor_base< |
301 | filter_iterator_base<WrappedIteratorT, PredicateT, IterTag>, |
302 | WrappedIteratorT, |
303 | typename std::common_type< |
304 | IterTag, typename std::iterator_traits< |
305 | WrappedIteratorT>::iterator_category>::type>; |
306 | |
307 | protected: |
308 | WrappedIteratorT End; |
309 | PredicateT Pred; |
310 | |
311 | void findNextValid() { |
312 | while (this->I != End && !Pred(*this->I)) |
313 | BaseT::operator++(); |
314 | } |
315 | |
316 | // Construct the iterator. The begin iterator needs to know where the end |
317 | // is, so that it can properly stop when it gets there. The end iterator only |
318 | // needs the predicate to support bidirectional iteration. |
319 | filter_iterator_base(WrappedIteratorT Begin, WrappedIteratorT End, |
320 | PredicateT Pred) |
321 | : BaseT(Begin), End(End), Pred(Pred) { |
322 | findNextValid(); |
323 | } |
324 | |
325 | public: |
326 | using BaseT::operator++; |
327 | |
328 | filter_iterator_base &operator++() { |
329 | BaseT::operator++(); |
330 | findNextValid(); |
331 | return *this; |
332 | } |
333 | }; |
334 | |
335 | /// Specialization of filter_iterator_base for forward iteration only. |
336 | template <typename WrappedIteratorT, typename PredicateT, |
337 | typename IterTag = std::forward_iterator_tag> |
338 | class filter_iterator_impl |
339 | : public filter_iterator_base<WrappedIteratorT, PredicateT, IterTag> { |
340 | using BaseT = filter_iterator_base<WrappedIteratorT, PredicateT, IterTag>; |
341 | |
342 | public: |
343 | filter_iterator_impl(WrappedIteratorT Begin, WrappedIteratorT End, |
344 | PredicateT Pred) |
345 | : BaseT(Begin, End, Pred) {} |
346 | }; |
347 | |
348 | /// Specialization of filter_iterator_base for bidirectional iteration. |
349 | template <typename WrappedIteratorT, typename PredicateT> |
350 | class filter_iterator_impl<WrappedIteratorT, PredicateT, |
351 | std::bidirectional_iterator_tag> |
352 | : public filter_iterator_base<WrappedIteratorT, PredicateT, |
353 | std::bidirectional_iterator_tag> { |
354 | using BaseT = filter_iterator_base<WrappedIteratorT, PredicateT, |
355 | std::bidirectional_iterator_tag>; |
356 | void findPrevValid() { |
357 | while (!this->Pred(*this->I)) |
358 | BaseT::operator--(); |
359 | } |
360 | |
361 | public: |
362 | using BaseT::operator--; |
363 | |
364 | filter_iterator_impl(WrappedIteratorT Begin, WrappedIteratorT End, |
365 | PredicateT Pred) |
366 | : BaseT(Begin, End, Pred) {} |
367 | |
368 | filter_iterator_impl &operator--() { |
369 | BaseT::operator--(); |
370 | findPrevValid(); |
371 | return *this; |
372 | } |
373 | }; |
374 | |
375 | namespace detail { |
376 | |
377 | template <bool is_bidirectional> struct fwd_or_bidi_tag_impl { |
378 | using type = std::forward_iterator_tag; |
379 | }; |
380 | |
381 | template <> struct fwd_or_bidi_tag_impl<true> { |
382 | using type = std::bidirectional_iterator_tag; |
383 | }; |
384 | |
385 | /// Helper which sets its type member to forward_iterator_tag if the category |
386 | /// of \p IterT does not derive from bidirectional_iterator_tag, and to |
387 | /// bidirectional_iterator_tag otherwise. |
388 | template <typename IterT> struct fwd_or_bidi_tag { |
389 | using type = typename fwd_or_bidi_tag_impl<std::is_base_of< |
390 | std::bidirectional_iterator_tag, |
391 | typename std::iterator_traits<IterT>::iterator_category>::value>::type; |
392 | }; |
393 | |
394 | } // namespace detail |
395 | |
396 | /// Defines filter_iterator to a suitable specialization of |
397 | /// filter_iterator_impl, based on the underlying iterator's category. |
398 | template <typename WrappedIteratorT, typename PredicateT> |
399 | using filter_iterator = filter_iterator_impl< |
400 | WrappedIteratorT, PredicateT, |
401 | typename detail::fwd_or_bidi_tag<WrappedIteratorT>::type>; |
402 | |
403 | /// Convenience function that takes a range of elements and a predicate, |
404 | /// and return a new filter_iterator range. |
405 | /// |
406 | /// FIXME: Currently if RangeT && is a rvalue reference to a temporary, the |
407 | /// lifetime of that temporary is not kept by the returned range object, and the |
408 | /// temporary is going to be dropped on the floor after the make_iterator_range |
409 | /// full expression that contains this function call. |
410 | template <typename RangeT, typename PredicateT> |
411 | iterator_range<filter_iterator<detail::IterOfRange<RangeT>, PredicateT>> |
412 | make_filter_range(RangeT &&Range, PredicateT Pred) { |
413 | using FilterIteratorT = |
414 | filter_iterator<detail::IterOfRange<RangeT>, PredicateT>; |
415 | return make_range( |
416 | FilterIteratorT(std::begin(std::forward<RangeT>(Range)), |
417 | std::end(std::forward<RangeT>(Range)), Pred), |
418 | FilterIteratorT(std::end(std::forward<RangeT>(Range)), |
419 | std::end(std::forward<RangeT>(Range)), Pred)); |
420 | } |
421 | |
422 | /// A pseudo-iterator adaptor that is designed to implement "early increment" |
423 | /// style loops. |
424 | /// |
425 | /// This is *not a normal iterator* and should almost never be used directly. It |
426 | /// is intended primarily to be used with range based for loops and some range |
427 | /// algorithms. |
428 | /// |
429 | /// The iterator isn't quite an `OutputIterator` or an `InputIterator` but |
430 | /// somewhere between them. The constraints of these iterators are: |
431 | /// |
432 | /// - On construction or after being incremented, it is comparable and |
433 | /// dereferencable. It is *not* incrementable. |
434 | /// - After being dereferenced, it is neither comparable nor dereferencable, it |
435 | /// is only incrementable. |
436 | /// |
437 | /// This means you can only dereference the iterator once, and you can only |
438 | /// increment it once between dereferences. |
439 | template <typename WrappedIteratorT> |
440 | class early_inc_iterator_impl |
441 | : public iterator_adaptor_base<early_inc_iterator_impl<WrappedIteratorT>, |
442 | WrappedIteratorT, std::input_iterator_tag> { |
443 | using BaseT = |
444 | iterator_adaptor_base<early_inc_iterator_impl<WrappedIteratorT>, |
445 | WrappedIteratorT, std::input_iterator_tag>; |
446 | |
447 | using PointerT = typename std::iterator_traits<WrappedIteratorT>::pointer; |
448 | |
449 | protected: |
450 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 |
451 | bool IsEarlyIncremented = false; |
452 | #endif |
453 | |
454 | public: |
455 | early_inc_iterator_impl(WrappedIteratorT I) : BaseT(I) {} |
456 | |
457 | using BaseT::operator*; |
458 | typename BaseT::reference operator*() { |
459 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 |
460 | assert(!IsEarlyIncremented && "Cannot dereference twice!")((!IsEarlyIncremented && "Cannot dereference twice!") ? static_cast<void> (0) : __assert_fail ("!IsEarlyIncremented && \"Cannot dereference twice!\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 460, __PRETTY_FUNCTION__)); |
461 | IsEarlyIncremented = true; |
462 | #endif |
463 | return *(this->I)++; |
464 | } |
465 | |
466 | using BaseT::operator++; |
467 | early_inc_iterator_impl &operator++() { |
468 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 |
469 | assert(IsEarlyIncremented && "Cannot increment before dereferencing!")((IsEarlyIncremented && "Cannot increment before dereferencing!" ) ? static_cast<void> (0) : __assert_fail ("IsEarlyIncremented && \"Cannot increment before dereferencing!\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 469, __PRETTY_FUNCTION__)); |
470 | IsEarlyIncremented = false; |
471 | #endif |
472 | return *this; |
473 | } |
474 | |
475 | using BaseT::operator==; |
476 | bool operator==(const early_inc_iterator_impl &RHS) const { |
477 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 |
478 | assert(!IsEarlyIncremented && "Cannot compare after dereferencing!")((!IsEarlyIncremented && "Cannot compare after dereferencing!" ) ? static_cast<void> (0) : __assert_fail ("!IsEarlyIncremented && \"Cannot compare after dereferencing!\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 478, __PRETTY_FUNCTION__)); |
479 | #endif |
480 | return BaseT::operator==(RHS); |
481 | } |
482 | }; |
483 | |
484 | /// Make a range that does early increment to allow mutation of the underlying |
485 | /// range without disrupting iteration. |
486 | /// |
487 | /// The underlying iterator will be incremented immediately after it is |
488 | /// dereferenced, allowing deletion of the current node or insertion of nodes to |
489 | /// not disrupt iteration provided they do not invalidate the *next* iterator -- |
490 | /// the current iterator can be invalidated. |
491 | /// |
492 | /// This requires a very exact pattern of use that is only really suitable to |
493 | /// range based for loops and other range algorithms that explicitly guarantee |
494 | /// to dereference exactly once each element, and to increment exactly once each |
495 | /// element. |
496 | template <typename RangeT> |
497 | iterator_range<early_inc_iterator_impl<detail::IterOfRange<RangeT>>> |
498 | make_early_inc_range(RangeT &&Range) { |
499 | using EarlyIncIteratorT = |
500 | early_inc_iterator_impl<detail::IterOfRange<RangeT>>; |
501 | return make_range(EarlyIncIteratorT(std::begin(std::forward<RangeT>(Range))), |
502 | EarlyIncIteratorT(std::end(std::forward<RangeT>(Range)))); |
503 | } |
504 | |
505 | // forward declarations required by zip_shortest/zip_first |
506 | template <typename R, typename UnaryPredicate> |
507 | bool all_of(R &&range, UnaryPredicate P); |
508 | |
509 | template <size_t... I> struct index_sequence; |
510 | |
511 | template <class... Ts> struct index_sequence_for; |
512 | |
513 | namespace detail { |
514 | |
515 | using std::declval; |
516 | |
517 | // We have to alias this since inlining the actual type at the usage site |
518 | // in the parameter list of iterator_facade_base<> below ICEs MSVC 2017. |
519 | template<typename... Iters> struct ZipTupleType { |
520 | using type = std::tuple<decltype(*declval<Iters>())...>; |
521 | }; |
522 | |
523 | template <typename ZipType, typename... Iters> |
524 | using zip_traits = iterator_facade_base< |
525 | ZipType, typename std::common_type<std::bidirectional_iterator_tag, |
526 | typename std::iterator_traits< |
527 | Iters>::iterator_category...>::type, |
528 | // ^ TODO: Implement random access methods. |
529 | typename ZipTupleType<Iters...>::type, |
530 | typename std::iterator_traits<typename std::tuple_element< |
531 | 0, std::tuple<Iters...>>::type>::difference_type, |
532 | // ^ FIXME: This follows boost::make_zip_iterator's assumption that all |
533 | // inner iterators have the same difference_type. It would fail if, for |
534 | // instance, the second field's difference_type were non-numeric while the |
535 | // first is. |
536 | typename ZipTupleType<Iters...>::type *, |
537 | typename ZipTupleType<Iters...>::type>; |
538 | |
539 | template <typename ZipType, typename... Iters> |
540 | struct zip_common : public zip_traits<ZipType, Iters...> { |
541 | using Base = zip_traits<ZipType, Iters...>; |
542 | using value_type = typename Base::value_type; |
543 | |
544 | std::tuple<Iters...> iterators; |
545 | |
546 | protected: |
547 | template <size_t... Ns> value_type deref(index_sequence<Ns...>) const { |
548 | return value_type(*std::get<Ns>(iterators)...); |
549 | } |
550 | |
551 | template <size_t... Ns> |
552 | decltype(iterators) tup_inc(index_sequence<Ns...>) const { |
553 | return std::tuple<Iters...>(std::next(std::get<Ns>(iterators))...); |
554 | } |
555 | |
556 | template <size_t... Ns> |
557 | decltype(iterators) tup_dec(index_sequence<Ns...>) const { |
558 | return std::tuple<Iters...>(std::prev(std::get<Ns>(iterators))...); |
559 | } |
560 | |
561 | public: |
562 | zip_common(Iters &&... ts) : iterators(std::forward<Iters>(ts)...) {} |
563 | |
564 | value_type operator*() { return deref(index_sequence_for<Iters...>{}); } |
565 | |
566 | const value_type operator*() const { |
567 | return deref(index_sequence_for<Iters...>{}); |
568 | } |
569 | |
570 | ZipType &operator++() { |
571 | iterators = tup_inc(index_sequence_for<Iters...>{}); |
572 | return *reinterpret_cast<ZipType *>(this); |
573 | } |
574 | |
575 | ZipType &operator--() { |
576 | static_assert(Base::IsBidirectional, |
577 | "All inner iterators must be at least bidirectional."); |
578 | iterators = tup_dec(index_sequence_for<Iters...>{}); |
579 | return *reinterpret_cast<ZipType *>(this); |
580 | } |
581 | }; |
582 | |
583 | template <typename... Iters> |
584 | struct zip_first : public zip_common<zip_first<Iters...>, Iters...> { |
585 | using Base = zip_common<zip_first<Iters...>, Iters...>; |
586 | |
587 | bool operator==(const zip_first<Iters...> &other) const { |
588 | return std::get<0>(this->iterators) == std::get<0>(other.iterators); |
589 | } |
590 | |
591 | zip_first(Iters &&... ts) : Base(std::forward<Iters>(ts)...) {} |
592 | }; |
593 | |
594 | template <typename... Iters> |
595 | class zip_shortest : public zip_common<zip_shortest<Iters...>, Iters...> { |
596 | template <size_t... Ns> |
597 | bool test(const zip_shortest<Iters...> &other, index_sequence<Ns...>) const { |
598 | return all_of(std::initializer_list<bool>{std::get<Ns>(this->iterators) != |
599 | std::get<Ns>(other.iterators)...}, |
600 | identity<bool>{}); |
601 | } |
602 | |
603 | public: |
604 | using Base = zip_common<zip_shortest<Iters...>, Iters...>; |
605 | |
606 | zip_shortest(Iters &&... ts) : Base(std::forward<Iters>(ts)...) {} |
607 | |
608 | bool operator==(const zip_shortest<Iters...> &other) const { |
609 | return !test(other, index_sequence_for<Iters...>{}); |
610 | } |
611 | }; |
612 | |
613 | template <template <typename...> class ItType, typename... Args> class zippy { |
614 | public: |
615 | using iterator = ItType<decltype(std::begin(std::declval<Args>()))...>; |
616 | using iterator_category = typename iterator::iterator_category; |
617 | using value_type = typename iterator::value_type; |
618 | using difference_type = typename iterator::difference_type; |
619 | using pointer = typename iterator::pointer; |
620 | using reference = typename iterator::reference; |
621 | |
622 | private: |
623 | std::tuple<Args...> ts; |
624 | |
625 | template <size_t... Ns> iterator begin_impl(index_sequence<Ns...>) const { |
626 | return iterator(std::begin(std::get<Ns>(ts))...); |
627 | } |
628 | template <size_t... Ns> iterator end_impl(index_sequence<Ns...>) const { |
629 | return iterator(std::end(std::get<Ns>(ts))...); |
630 | } |
631 | |
632 | public: |
633 | zippy(Args &&... ts_) : ts(std::forward<Args>(ts_)...) {} |
634 | |
635 | iterator begin() const { return begin_impl(index_sequence_for<Args...>{}); } |
636 | iterator end() const { return end_impl(index_sequence_for<Args...>{}); } |
637 | }; |
638 | |
639 | } // end namespace detail |
640 | |
641 | /// zip iterator for two or more iteratable types. |
642 | template <typename T, typename U, typename... Args> |
643 | detail::zippy<detail::zip_shortest, T, U, Args...> zip(T &&t, U &&u, |
644 | Args &&... args) { |
645 | return detail::zippy<detail::zip_shortest, T, U, Args...>( |
646 | std::forward<T>(t), std::forward<U>(u), std::forward<Args>(args)...); |
647 | } |
648 | |
649 | /// zip iterator that, for the sake of efficiency, assumes the first iteratee to |
650 | /// be the shortest. |
651 | template <typename T, typename U, typename... Args> |
652 | detail::zippy<detail::zip_first, T, U, Args...> zip_first(T &&t, U &&u, |
653 | Args &&... args) { |
654 | return detail::zippy<detail::zip_first, T, U, Args...>( |
655 | std::forward<T>(t), std::forward<U>(u), std::forward<Args>(args)...); |
656 | } |
657 | |
658 | /// Iterator wrapper that concatenates sequences together. |
659 | /// |
660 | /// This can concatenate different iterators, even with different types, into |
661 | /// a single iterator provided the value types of all the concatenated |
662 | /// iterators expose `reference` and `pointer` types that can be converted to |
663 | /// `ValueT &` and `ValueT *` respectively. It doesn't support more |
664 | /// interesting/customized pointer or reference types. |
665 | /// |
666 | /// Currently this only supports forward or higher iterator categories as |
667 | /// inputs and always exposes a forward iterator interface. |
668 | template <typename ValueT, typename... IterTs> |
669 | class concat_iterator |
670 | : public iterator_facade_base<concat_iterator<ValueT, IterTs...>, |
671 | std::forward_iterator_tag, ValueT> { |
672 | using BaseT = typename concat_iterator::iterator_facade_base; |
673 | |
674 | /// We store both the current and end iterators for each concatenated |
675 | /// sequence in a tuple of pairs. |
676 | /// |
677 | /// Note that something like iterator_range seems nice at first here, but the |
678 | /// range properties are of little benefit and end up getting in the way |
679 | /// because we need to do mutation on the current iterators. |
680 | std::tuple<IterTs...> Begins; |
681 | std::tuple<IterTs...> Ends; |
682 | |
683 | /// Attempts to increment a specific iterator. |
684 | /// |
685 | /// Returns true if it was able to increment the iterator. Returns false if |
686 | /// the iterator is already at the end iterator. |
687 | template <size_t Index> bool incrementHelper() { |
688 | auto &Begin = std::get<Index>(Begins); |
689 | auto &End = std::get<Index>(Ends); |
690 | if (Begin == End) |
691 | return false; |
692 | |
693 | ++Begin; |
694 | return true; |
695 | } |
696 | |
697 | /// Increments the first non-end iterator. |
698 | /// |
699 | /// It is an error to call this with all iterators at the end. |
700 | template <size_t... Ns> void increment(index_sequence<Ns...>) { |
701 | // Build a sequence of functions to increment each iterator if possible. |
702 | bool (concat_iterator::*IncrementHelperFns[])() = { |
703 | &concat_iterator::incrementHelper<Ns>...}; |
704 | |
705 | // Loop over them, and stop as soon as we succeed at incrementing one. |
706 | for (auto &IncrementHelperFn : IncrementHelperFns) |
707 | if ((this->*IncrementHelperFn)()) |
708 | return; |
709 | |
710 | llvm_unreachable("Attempted to increment an end concat iterator!")::llvm::llvm_unreachable_internal("Attempted to increment an end concat iterator!" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 710); |
711 | } |
712 | |
713 | /// Returns null if the specified iterator is at the end. Otherwise, |
714 | /// dereferences the iterator and returns the address of the resulting |
715 | /// reference. |
716 | template <size_t Index> ValueT *getHelper() const { |
717 | auto &Begin = std::get<Index>(Begins); |
718 | auto &End = std::get<Index>(Ends); |
719 | if (Begin == End) |
720 | return nullptr; |
721 | |
722 | return &*Begin; |
723 | } |
724 | |
725 | /// Finds the first non-end iterator, dereferences, and returns the resulting |
726 | /// reference. |
727 | /// |
728 | /// It is an error to call this with all iterators at the end. |
729 | template <size_t... Ns> ValueT &get(index_sequence<Ns...>) const { |
730 | // Build a sequence of functions to get from iterator if possible. |
731 | ValueT *(concat_iterator::*GetHelperFns[])() const = { |
732 | &concat_iterator::getHelper<Ns>...}; |
733 | |
734 | // Loop over them, and return the first result we find. |
735 | for (auto &GetHelperFn : GetHelperFns) |
736 | if (ValueT *P = (this->*GetHelperFn)()) |
737 | return *P; |
738 | |
739 | llvm_unreachable("Attempted to get a pointer from an end concat iterator!")::llvm::llvm_unreachable_internal("Attempted to get a pointer from an end concat iterator!" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 739); |
740 | } |
741 | |
742 | public: |
743 | /// Constructs an iterator from a squence of ranges. |
744 | /// |
745 | /// We need the full range to know how to switch between each of the |
746 | /// iterators. |
747 | template <typename... RangeTs> |
748 | explicit concat_iterator(RangeTs &&... Ranges) |
749 | : Begins(std::begin(Ranges)...), Ends(std::end(Ranges)...) {} |
750 | |
751 | using BaseT::operator++; |
752 | |
753 | concat_iterator &operator++() { |
754 | increment(index_sequence_for<IterTs...>()); |
755 | return *this; |
756 | } |
757 | |
758 | ValueT &operator*() const { return get(index_sequence_for<IterTs...>()); } |
759 | |
760 | bool operator==(const concat_iterator &RHS) const { |
761 | return Begins == RHS.Begins && Ends == RHS.Ends; |
762 | } |
763 | }; |
764 | |
765 | namespace detail { |
766 | |
767 | /// Helper to store a sequence of ranges being concatenated and access them. |
768 | /// |
769 | /// This is designed to facilitate providing actual storage when temporaries |
770 | /// are passed into the constructor such that we can use it as part of range |
771 | /// based for loops. |
772 | template <typename ValueT, typename... RangeTs> class concat_range { |
773 | public: |
774 | using iterator = |
775 | concat_iterator<ValueT, |
776 | decltype(std::begin(std::declval<RangeTs &>()))...>; |
777 | |
778 | private: |
779 | std::tuple<RangeTs...> Ranges; |
780 | |
781 | template <size_t... Ns> iterator begin_impl(index_sequence<Ns...>) { |
782 | return iterator(std::get<Ns>(Ranges)...); |
783 | } |
784 | template <size_t... Ns> iterator end_impl(index_sequence<Ns...>) { |
785 | return iterator(make_range(std::end(std::get<Ns>(Ranges)), |
786 | std::end(std::get<Ns>(Ranges)))...); |
787 | } |
788 | |
789 | public: |
790 | concat_range(RangeTs &&... Ranges) |
791 | : Ranges(std::forward<RangeTs>(Ranges)...) {} |
792 | |
793 | iterator begin() { return begin_impl(index_sequence_for<RangeTs...>{}); } |
794 | iterator end() { return end_impl(index_sequence_for<RangeTs...>{}); } |
795 | }; |
796 | |
797 | } // end namespace detail |
798 | |
799 | /// Concatenated range across two or more ranges. |
800 | /// |
801 | /// The desired value type must be explicitly specified. |
802 | template <typename ValueT, typename... RangeTs> |
803 | detail::concat_range<ValueT, RangeTs...> concat(RangeTs &&... Ranges) { |
804 | static_assert(sizeof...(RangeTs) > 1, |
805 | "Need more than one range to concatenate!"); |
806 | return detail::concat_range<ValueT, RangeTs...>( |
807 | std::forward<RangeTs>(Ranges)...); |
808 | } |
809 | |
810 | //===----------------------------------------------------------------------===// |
811 | // Extra additions to <utility> |
812 | //===----------------------------------------------------------------------===// |
813 | |
814 | /// Function object to check whether the first component of a std::pair |
815 | /// compares less than the first component of another std::pair. |
816 | struct less_first { |
817 | template <typename T> bool operator()(const T &lhs, const T &rhs) const { |
818 | return lhs.first < rhs.first; |
819 | } |
820 | }; |
821 | |
822 | /// Function object to check whether the second component of a std::pair |
823 | /// compares less than the second component of another std::pair. |
824 | struct less_second { |
825 | template <typename T> bool operator()(const T &lhs, const T &rhs) const { |
826 | return lhs.second < rhs.second; |
827 | } |
828 | }; |
829 | |
830 | /// \brief Function object to apply a binary function to the first component of |
831 | /// a std::pair. |
832 | template<typename FuncTy> |
833 | struct on_first { |
834 | FuncTy func; |
835 | |
836 | template <typename T> |
837 | auto operator()(const T &lhs, const T &rhs) const |
838 | -> decltype(func(lhs.first, rhs.first)) { |
839 | return func(lhs.first, rhs.first); |
840 | } |
841 | }; |
842 | |
843 | // A subset of N3658. More stuff can be added as-needed. |
844 | |
845 | /// Represents a compile-time sequence of integers. |
846 | template <class T, T... I> struct integer_sequence { |
847 | using value_type = T; |
848 | |
849 | static constexpr size_t size() { return sizeof...(I); } |
850 | }; |
851 | |
852 | /// Alias for the common case of a sequence of size_ts. |
853 | template <size_t... I> |
854 | struct index_sequence : integer_sequence<std::size_t, I...> {}; |
855 | |
856 | template <std::size_t N, std::size_t... I> |
857 | struct build_index_impl : build_index_impl<N - 1, N - 1, I...> {}; |
858 | template <std::size_t... I> |
859 | struct build_index_impl<0, I...> : index_sequence<I...> {}; |
860 | |
861 | /// Creates a compile-time integer sequence for a parameter pack. |
862 | template <class... Ts> |
863 | struct index_sequence_for : build_index_impl<sizeof...(Ts)> {}; |
864 | |
865 | /// Utility type to build an inheritance chain that makes it easy to rank |
866 | /// overload candidates. |
867 | template <int N> struct rank : rank<N - 1> {}; |
868 | template <> struct rank<0> {}; |
869 | |
870 | /// traits class for checking whether type T is one of any of the given |
871 | /// types in the variadic list. |
872 | template <typename T, typename... Ts> struct is_one_of { |
873 | static const bool value = false; |
874 | }; |
875 | |
876 | template <typename T, typename U, typename... Ts> |
877 | struct is_one_of<T, U, Ts...> { |
878 | static const bool value = |
879 | std::is_same<T, U>::value || is_one_of<T, Ts...>::value; |
880 | }; |
881 | |
882 | /// traits class for checking whether type T is a base class for all |
883 | /// the given types in the variadic list. |
884 | template <typename T, typename... Ts> struct are_base_of { |
885 | static const bool value = true; |
886 | }; |
887 | |
888 | template <typename T, typename U, typename... Ts> |
889 | struct are_base_of<T, U, Ts...> { |
890 | static const bool value = |
891 | std::is_base_of<T, U>::value && are_base_of<T, Ts...>::value; |
892 | }; |
893 | |
894 | //===----------------------------------------------------------------------===// |
895 | // Extra additions for arrays |
896 | //===----------------------------------------------------------------------===// |
897 | |
898 | /// Find the length of an array. |
899 | template <class T, std::size_t N> |
900 | constexpr inline size_t array_lengthof(T (&)[N]) { |
901 | return N; |
902 | } |
903 | |
904 | /// Adapt std::less<T> for array_pod_sort. |
905 | template<typename T> |
906 | inline int array_pod_sort_comparator(const void *P1, const void *P2) { |
907 | if (std::less<T>()(*reinterpret_cast<const T*>(P1), |
908 | *reinterpret_cast<const T*>(P2))) |
909 | return -1; |
910 | if (std::less<T>()(*reinterpret_cast<const T*>(P2), |
911 | *reinterpret_cast<const T*>(P1))) |
912 | return 1; |
913 | return 0; |
914 | } |
915 | |
916 | /// get_array_pod_sort_comparator - This is an internal helper function used to |
917 | /// get type deduction of T right. |
918 | template<typename T> |
919 | inline int (*get_array_pod_sort_comparator(const T &)) |
920 | (const void*, const void*) { |
921 | return array_pod_sort_comparator<T>; |
922 | } |
923 | |
924 | /// array_pod_sort - This sorts an array with the specified start and end |
925 | /// extent. This is just like std::sort, except that it calls qsort instead of |
926 | /// using an inlined template. qsort is slightly slower than std::sort, but |
927 | /// most sorts are not performance critical in LLVM and std::sort has to be |
928 | /// template instantiated for each type, leading to significant measured code |
929 | /// bloat. This function should generally be used instead of std::sort where |
930 | /// possible. |
931 | /// |
932 | /// This function assumes that you have simple POD-like types that can be |
933 | /// compared with std::less and can be moved with memcpy. If this isn't true, |
934 | /// you should use std::sort. |
935 | /// |
936 | /// NOTE: If qsort_r were portable, we could allow a custom comparator and |
937 | /// default to std::less. |
938 | template<class IteratorTy> |
939 | inline void array_pod_sort(IteratorTy Start, IteratorTy End) { |
940 | // Don't inefficiently call qsort with one element or trigger undefined |
941 | // behavior with an empty sequence. |
942 | auto NElts = End - Start; |
943 | if (NElts <= 1) return; |
944 | #ifdef EXPENSIVE_CHECKS |
945 | std::mt19937 Generator(std::random_device{}()); |
946 | std::shuffle(Start, End, Generator); |
947 | #endif |
948 | qsort(&*Start, NElts, sizeof(*Start), get_array_pod_sort_comparator(*Start)); |
949 | } |
950 | |
951 | template <class IteratorTy> |
952 | inline void array_pod_sort( |
953 | IteratorTy Start, IteratorTy End, |
954 | int (*Compare)( |
955 | const typename std::iterator_traits<IteratorTy>::value_type *, |
956 | const typename std::iterator_traits<IteratorTy>::value_type *)) { |
957 | // Don't inefficiently call qsort with one element or trigger undefined |
958 | // behavior with an empty sequence. |
959 | auto NElts = End - Start; |
960 | if (NElts <= 1) return; |
961 | #ifdef EXPENSIVE_CHECKS |
962 | std::mt19937 Generator(std::random_device{}()); |
963 | std::shuffle(Start, End, Generator); |
964 | #endif |
965 | qsort(&*Start, NElts, sizeof(*Start), |
966 | reinterpret_cast<int (*)(const void *, const void *)>(Compare)); |
967 | } |
968 | |
969 | // Provide wrappers to std::sort which shuffle the elements before sorting |
970 | // to help uncover non-deterministic behavior (PR35135). |
971 | template <typename IteratorTy> |
972 | inline void sort(IteratorTy Start, IteratorTy End) { |
973 | #ifdef EXPENSIVE_CHECKS |
974 | std::mt19937 Generator(std::random_device{}()); |
975 | std::shuffle(Start, End, Generator); |
976 | #endif |
977 | std::sort(Start, End); |
978 | } |
979 | |
980 | template <typename Container> inline void sort(Container &&C) { |
981 | llvm::sort(adl_begin(C), adl_end(C)); |
982 | } |
983 | |
984 | template <typename IteratorTy, typename Compare> |
985 | inline void sort(IteratorTy Start, IteratorTy End, Compare Comp) { |
986 | #ifdef EXPENSIVE_CHECKS |
987 | std::mt19937 Generator(std::random_device{}()); |
988 | std::shuffle(Start, End, Generator); |
989 | #endif |
990 | std::sort(Start, End, Comp); |
991 | } |
992 | |
993 | template <typename Container, typename Compare> |
994 | inline void sort(Container &&C, Compare Comp) { |
995 | llvm::sort(adl_begin(C), adl_end(C), Comp); |
996 | } |
997 | |
998 | //===----------------------------------------------------------------------===// |
999 | // Extra additions to <algorithm> |
1000 | //===----------------------------------------------------------------------===// |
1001 | |
1002 | /// For a container of pointers, deletes the pointers and then clears the |
1003 | /// container. |
1004 | template<typename Container> |
1005 | void DeleteContainerPointers(Container &C) { |
1006 | for (auto V : C) |
1007 | delete V; |
1008 | C.clear(); |
1009 | } |
1010 | |
1011 | /// In a container of pairs (usually a map) whose second element is a pointer, |
1012 | /// deletes the second elements and then clears the container. |
1013 | template<typename Container> |
1014 | void DeleteContainerSeconds(Container &C) { |
1015 | for (auto &V : C) |
1016 | delete V.second; |
1017 | C.clear(); |
1018 | } |
1019 | |
1020 | /// Get the size of a range. This is a wrapper function around std::distance |
1021 | /// which is only enabled when the operation is O(1). |
1022 | template <typename R> |
1023 | auto size(R &&Range, typename std::enable_if< |
1024 | std::is_same<typename std::iterator_traits<decltype( |
1025 | Range.begin())>::iterator_category, |
1026 | std::random_access_iterator_tag>::value, |
1027 | void>::type * = nullptr) |
1028 | -> decltype(std::distance(Range.begin(), Range.end())) { |
1029 | return std::distance(Range.begin(), Range.end()); |
1030 | } |
1031 | |
1032 | /// Provide wrappers to std::for_each which take ranges instead of having to |
1033 | /// pass begin/end explicitly. |
1034 | template <typename R, typename UnaryPredicate> |
1035 | UnaryPredicate for_each(R &&Range, UnaryPredicate P) { |
1036 | return std::for_each(adl_begin(Range), adl_end(Range), P); |
1037 | } |
1038 | |
1039 | /// Provide wrappers to std::all_of which take ranges instead of having to pass |
1040 | /// begin/end explicitly. |
1041 | template <typename R, typename UnaryPredicate> |
1042 | bool all_of(R &&Range, UnaryPredicate P) { |
1043 | return std::all_of(adl_begin(Range), adl_end(Range), P); |
1044 | } |
1045 | |
1046 | /// Provide wrappers to std::any_of which take ranges instead of having to pass |
1047 | /// begin/end explicitly. |
1048 | template <typename R, typename UnaryPredicate> |
1049 | bool any_of(R &&Range, UnaryPredicate P) { |
1050 | return std::any_of(adl_begin(Range), adl_end(Range), P); |
1051 | } |
1052 | |
1053 | /// Provide wrappers to std::none_of which take ranges instead of having to pass |
1054 | /// begin/end explicitly. |
1055 | template <typename R, typename UnaryPredicate> |
1056 | bool none_of(R &&Range, UnaryPredicate P) { |
1057 | return std::none_of(adl_begin(Range), adl_end(Range), P); |
1058 | } |
1059 | |
1060 | /// Provide wrappers to std::find which take ranges instead of having to pass |
1061 | /// begin/end explicitly. |
1062 | template <typename R, typename T> |
1063 | auto find(R &&Range, const T &Val) -> decltype(adl_begin(Range)) { |
1064 | return std::find(adl_begin(Range), adl_end(Range), Val); |
1065 | } |
1066 | |
1067 | /// Provide wrappers to std::find_if which take ranges instead of having to pass |
1068 | /// begin/end explicitly. |
1069 | template <typename R, typename UnaryPredicate> |
1070 | auto find_if(R &&Range, UnaryPredicate P) -> decltype(adl_begin(Range)) { |
1071 | return std::find_if(adl_begin(Range), adl_end(Range), P); |
1072 | } |
1073 | |
1074 | template <typename R, typename UnaryPredicate> |
1075 | auto find_if_not(R &&Range, UnaryPredicate P) -> decltype(adl_begin(Range)) { |
1076 | return std::find_if_not(adl_begin(Range), adl_end(Range), P); |
1077 | } |
1078 | |
1079 | /// Provide wrappers to std::remove_if which take ranges instead of having to |
1080 | /// pass begin/end explicitly. |
1081 | template <typename R, typename UnaryPredicate> |
1082 | auto remove_if(R &&Range, UnaryPredicate P) -> decltype(adl_begin(Range)) { |
1083 | return std::remove_if(adl_begin(Range), adl_end(Range), P); |
1084 | } |
1085 | |
1086 | /// Provide wrappers to std::copy_if which take ranges instead of having to |
1087 | /// pass begin/end explicitly. |
1088 | template <typename R, typename OutputIt, typename UnaryPredicate> |
1089 | OutputIt copy_if(R &&Range, OutputIt Out, UnaryPredicate P) { |
1090 | return std::copy_if(adl_begin(Range), adl_end(Range), Out, P); |
1091 | } |
1092 | |
1093 | template <typename R, typename OutputIt> |
1094 | OutputIt copy(R &&Range, OutputIt Out) { |
1095 | return std::copy(adl_begin(Range), adl_end(Range), Out); |
1096 | } |
1097 | |
1098 | /// Wrapper function around std::find to detect if an element exists |
1099 | /// in a container. |
1100 | template <typename R, typename E> |
1101 | bool is_contained(R &&Range, const E &Element) { |
1102 | return std::find(adl_begin(Range), adl_end(Range), Element) != adl_end(Range); |
1103 | } |
1104 | |
1105 | /// Wrapper function around std::count to count the number of times an element |
1106 | /// \p Element occurs in the given range \p Range. |
1107 | template <typename R, typename E> |
1108 | auto count(R &&Range, const E &Element) -> |
1109 | typename std::iterator_traits<decltype(adl_begin(Range))>::difference_type { |
1110 | return std::count(adl_begin(Range), adl_end(Range), Element); |
1111 | } |
1112 | |
1113 | /// Wrapper function around std::count_if to count the number of times an |
1114 | /// element satisfying a given predicate occurs in a range. |
1115 | template <typename R, typename UnaryPredicate> |
1116 | auto count_if(R &&Range, UnaryPredicate P) -> |
1117 | typename std::iterator_traits<decltype(adl_begin(Range))>::difference_type { |
1118 | return std::count_if(adl_begin(Range), adl_end(Range), P); |
1119 | } |
1120 | |
1121 | /// Wrapper function around std::transform to apply a function to a range and |
1122 | /// store the result elsewhere. |
1123 | template <typename R, typename OutputIt, typename UnaryPredicate> |
1124 | OutputIt transform(R &&Range, OutputIt d_first, UnaryPredicate P) { |
1125 | return std::transform(adl_begin(Range), adl_end(Range), d_first, P); |
1126 | } |
1127 | |
1128 | /// Provide wrappers to std::partition which take ranges instead of having to |
1129 | /// pass begin/end explicitly. |
1130 | template <typename R, typename UnaryPredicate> |
1131 | auto partition(R &&Range, UnaryPredicate P) -> decltype(adl_begin(Range)) { |
1132 | return std::partition(adl_begin(Range), adl_end(Range), P); |
1133 | } |
1134 | |
1135 | /// Provide wrappers to std::lower_bound which take ranges instead of having to |
1136 | /// pass begin/end explicitly. |
1137 | template <typename R, typename ForwardIt> |
1138 | auto lower_bound(R &&Range, ForwardIt I) -> decltype(adl_begin(Range)) { |
1139 | return std::lower_bound(adl_begin(Range), adl_end(Range), I); |
1140 | } |
1141 | |
1142 | template <typename R, typename ForwardIt, typename Compare> |
1143 | auto lower_bound(R &&Range, ForwardIt I, Compare C) |
1144 | -> decltype(adl_begin(Range)) { |
1145 | return std::lower_bound(adl_begin(Range), adl_end(Range), I, C); |
1146 | } |
1147 | |
1148 | /// Provide wrappers to std::upper_bound which take ranges instead of having to |
1149 | /// pass begin/end explicitly. |
1150 | template <typename R, typename ForwardIt> |
1151 | auto upper_bound(R &&Range, ForwardIt I) -> decltype(adl_begin(Range)) { |
1152 | return std::upper_bound(adl_begin(Range), adl_end(Range), I); |
1153 | } |
1154 | |
1155 | template <typename R, typename ForwardIt, typename Compare> |
1156 | auto upper_bound(R &&Range, ForwardIt I, Compare C) |
1157 | -> decltype(adl_begin(Range)) { |
1158 | return std::upper_bound(adl_begin(Range), adl_end(Range), I, C); |
1159 | } |
1160 | /// Wrapper function around std::equal to detect if all elements |
1161 | /// in a container are same. |
1162 | template <typename R> |
1163 | bool is_splat(R &&Range) { |
1164 | size_t range_size = size(Range); |
1165 | return range_size != 0 && (range_size == 1 || |
1166 | std::equal(adl_begin(Range) + 1, adl_end(Range), adl_begin(Range))); |
1167 | } |
1168 | |
1169 | /// Given a range of type R, iterate the entire range and return a |
1170 | /// SmallVector with elements of the vector. This is useful, for example, |
1171 | /// when you want to iterate a range and then sort the results. |
1172 | template <unsigned Size, typename R> |
1173 | SmallVector<typename std::remove_const<detail::ValueOfRange<R>>::type, Size> |
1174 | to_vector(R &&Range) { |
1175 | return {adl_begin(Range), adl_end(Range)}; |
1176 | } |
1177 | |
1178 | /// Provide a container algorithm similar to C++ Library Fundamentals v2's |
1179 | /// `erase_if` which is equivalent to: |
1180 | /// |
1181 | /// C.erase(remove_if(C, pred), C.end()); |
1182 | /// |
1183 | /// This version works for any container with an erase method call accepting |
1184 | /// two iterators. |
1185 | template <typename Container, typename UnaryPredicate> |
1186 | void erase_if(Container &C, UnaryPredicate P) { |
1187 | C.erase(remove_if(C, P), C.end()); |
1188 | } |
1189 | |
1190 | //===----------------------------------------------------------------------===// |
1191 | // Extra additions to <memory> |
1192 | //===----------------------------------------------------------------------===// |
1193 | |
1194 | // Implement make_unique according to N3656. |
1195 | |
1196 | /// Constructs a `new T()` with the given args and returns a |
1197 | /// `unique_ptr<T>` which owns the object. |
1198 | /// |
1199 | /// Example: |
1200 | /// |
1201 | /// auto p = make_unique<int>(); |
1202 | /// auto p = make_unique<std::tuple<int, int>>(0, 1); |
1203 | template <class T, class... Args> |
1204 | typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T>>::type |
1205 | make_unique(Args &&... args) { |
1206 | return std::unique_ptr<T>(new T(std::forward<Args>(args)...)); |
1207 | } |
1208 | |
1209 | /// Constructs a `new T[n]` with the given args and returns a |
1210 | /// `unique_ptr<T[]>` which owns the object. |
1211 | /// |
1212 | /// \param n size of the new array. |
1213 | /// |
1214 | /// Example: |
1215 | /// |
1216 | /// auto p = make_unique<int[]>(2); // value-initializes the array with 0's. |
1217 | template <class T> |
1218 | typename std::enable_if<std::is_array<T>::value && std::extent<T>::value == 0, |
1219 | std::unique_ptr<T>>::type |
1220 | make_unique(size_t n) { |
1221 | return std::unique_ptr<T>(new typename std::remove_extent<T>::type[n]()); |
1222 | } |
1223 | |
1224 | /// This function isn't used and is only here to provide better compile errors. |
1225 | template <class T, class... Args> |
1226 | typename std::enable_if<std::extent<T>::value != 0>::type |
1227 | make_unique(Args &&...) = delete; |
1228 | |
1229 | struct FreeDeleter { |
1230 | void operator()(void* v) { |
1231 | ::free(v); |
1232 | } |
1233 | }; |
1234 | |
1235 | template<typename First, typename Second> |
1236 | struct pair_hash { |
1237 | size_t operator()(const std::pair<First, Second> &P) const { |
1238 | return std::hash<First>()(P.first) * 31 + std::hash<Second>()(P.second); |
1239 | } |
1240 | }; |
1241 | |
1242 | /// A functor like C++14's std::less<void> in its absence. |
1243 | struct less { |
1244 | template <typename A, typename B> bool operator()(A &&a, B &&b) const { |
1245 | return std::forward<A>(a) < std::forward<B>(b); |
1246 | } |
1247 | }; |
1248 | |
1249 | /// A functor like C++14's std::equal<void> in its absence. |
1250 | struct equal { |
1251 | template <typename A, typename B> bool operator()(A &&a, B &&b) const { |
1252 | return std::forward<A>(a) == std::forward<B>(b); |
1253 | } |
1254 | }; |
1255 | |
1256 | /// Binary functor that adapts to any other binary functor after dereferencing |
1257 | /// operands. |
1258 | template <typename T> struct deref { |
1259 | T func; |
1260 | |
1261 | // Could be further improved to cope with non-derivable functors and |
1262 | // non-binary functors (should be a variadic template member function |
1263 | // operator()). |
1264 | template <typename A, typename B> |
1265 | auto operator()(A &lhs, B &rhs) const -> decltype(func(*lhs, *rhs)) { |
1266 | assert(lhs)((lhs) ? static_cast<void> (0) : __assert_fail ("lhs", "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 1266, __PRETTY_FUNCTION__)); |
1267 | assert(rhs)((rhs) ? static_cast<void> (0) : __assert_fail ("rhs", "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 1267, __PRETTY_FUNCTION__)); |
1268 | return func(*lhs, *rhs); |
1269 | } |
1270 | }; |
1271 | |
1272 | namespace detail { |
1273 | |
1274 | template <typename R> class enumerator_iter; |
1275 | |
1276 | template <typename R> struct result_pair { |
1277 | friend class enumerator_iter<R>; |
1278 | |
1279 | result_pair() = default; |
1280 | result_pair(std::size_t Index, IterOfRange<R> Iter) |
1281 | : Index(Index), Iter(Iter) {} |
1282 | |
1283 | result_pair<R> &operator=(const result_pair<R> &Other) { |
1284 | Index = Other.Index; |
1285 | Iter = Other.Iter; |
1286 | return *this; |
1287 | } |
1288 | |
1289 | std::size_t index() const { return Index; } |
1290 | const ValueOfRange<R> &value() const { return *Iter; } |
1291 | ValueOfRange<R> &value() { return *Iter; } |
1292 | |
1293 | private: |
1294 | std::size_t Index = std::numeric_limits<std::size_t>::max(); |
1295 | IterOfRange<R> Iter; |
1296 | }; |
1297 | |
1298 | template <typename R> |
1299 | class enumerator_iter |
1300 | : public iterator_facade_base< |
1301 | enumerator_iter<R>, std::forward_iterator_tag, result_pair<R>, |
1302 | typename std::iterator_traits<IterOfRange<R>>::difference_type, |
1303 | typename std::iterator_traits<IterOfRange<R>>::pointer, |
1304 | typename std::iterator_traits<IterOfRange<R>>::reference> { |
1305 | using result_type = result_pair<R>; |
1306 | |
1307 | public: |
1308 | explicit enumerator_iter(IterOfRange<R> EndIter) |
1309 | : Result(std::numeric_limits<size_t>::max(), EndIter) {} |
1310 | |
1311 | enumerator_iter(std::size_t Index, IterOfRange<R> Iter) |
1312 | : Result(Index, Iter) {} |
1313 | |
1314 | result_type &operator*() { return Result; } |
1315 | const result_type &operator*() const { return Result; } |
1316 | |
1317 | enumerator_iter<R> &operator++() { |
1318 | assert(Result.Index != std::numeric_limits<size_t>::max())((Result.Index != std::numeric_limits<size_t>::max()) ? static_cast<void> (0) : __assert_fail ("Result.Index != std::numeric_limits<size_t>::max()" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ADT/STLExtras.h" , 1318, __PRETTY_FUNCTION__)); |
1319 | ++Result.Iter; |
1320 | ++Result.Index; |
1321 | return *this; |
1322 | } |
1323 | |
1324 | bool operator==(const enumerator_iter<R> &RHS) const { |
1325 | // Don't compare indices here, only iterators. It's possible for an end |
1326 | // iterator to have different indices depending on whether it was created |
1327 | // by calling std::end() versus incrementing a valid iterator. |
1328 | return Result.Iter == RHS.Result.Iter; |
1329 | } |
1330 | |
1331 | enumerator_iter<R> &operator=(const enumerator_iter<R> &Other) { |
1332 | Result = Other.Result; |
1333 | return *this; |
1334 | } |
1335 | |
1336 | private: |
1337 | result_type Result; |
1338 | }; |
1339 | |
1340 | template <typename R> class enumerator { |
1341 | public: |
1342 | explicit enumerator(R &&Range) : TheRange(std::forward<R>(Range)) {} |
1343 | |
1344 | enumerator_iter<R> begin() { |
1345 | return enumerator_iter<R>(0, std::begin(TheRange)); |
1346 | } |
1347 | |
1348 | enumerator_iter<R> end() { |
1349 | return enumerator_iter<R>(std::end(TheRange)); |
1350 | } |
1351 | |
1352 | private: |
1353 | R TheRange; |
1354 | }; |
1355 | |
1356 | } // end namespace detail |
1357 | |
1358 | /// Given an input range, returns a new range whose values are are pair (A,B) |
1359 | /// such that A is the 0-based index of the item in the sequence, and B is |
1360 | /// the value from the original sequence. Example: |
1361 | /// |
1362 | /// std::vector<char> Items = {'A', 'B', 'C', 'D'}; |
1363 | /// for (auto X : enumerate(Items)) { |
1364 | /// printf("Item %d - %c\n", X.index(), X.value()); |
1365 | /// } |
1366 | /// |
1367 | /// Output: |
1368 | /// Item 0 - A |
1369 | /// Item 1 - B |
1370 | /// Item 2 - C |
1371 | /// Item 3 - D |
1372 | /// |
1373 | template <typename R> detail::enumerator<R> enumerate(R &&TheRange) { |
1374 | return detail::enumerator<R>(std::forward<R>(TheRange)); |
1375 | } |
1376 | |
1377 | namespace detail { |
1378 | |
1379 | template <typename F, typename Tuple, std::size_t... I> |
1380 | auto apply_tuple_impl(F &&f, Tuple &&t, index_sequence<I...>) |
1381 | -> decltype(std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...)) { |
1382 | return std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...); |
1383 | } |
1384 | |
1385 | } // end namespace detail |
1386 | |
1387 | /// Given an input tuple (a1, a2, ..., an), pass the arguments of the |
1388 | /// tuple variadically to f as if by calling f(a1, a2, ..., an) and |
1389 | /// return the result. |
1390 | template <typename F, typename Tuple> |
1391 | auto apply_tuple(F &&f, Tuple &&t) -> decltype(detail::apply_tuple_impl( |
1392 | std::forward<F>(f), std::forward<Tuple>(t), |
1393 | build_index_impl< |
1394 | std::tuple_size<typename std::decay<Tuple>::type>::value>{})) { |
1395 | using Indices = build_index_impl< |
1396 | std::tuple_size<typename std::decay<Tuple>::type>::value>; |
1397 | |
1398 | return detail::apply_tuple_impl(std::forward<F>(f), std::forward<Tuple>(t), |
1399 | Indices{}); |
1400 | } |
1401 | |
1402 | } // end namespace llvm |
1403 | |
1404 | #endif // LLVM_ADT_STLEXTRAS_H |