File: | include/llvm/Support/Error.h |
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1 | //===- ArchiveWriter.cpp - ar File Format implementation --------*- C++ -*-===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | // This file defines the writeArchive function. | |||
10 | // | |||
11 | //===----------------------------------------------------------------------===// | |||
12 | ||||
13 | #include "llvm/Object/ArchiveWriter.h" | |||
14 | #include "llvm/ADT/ArrayRef.h" | |||
15 | #include "llvm/ADT/StringRef.h" | |||
16 | #include "llvm/BinaryFormat/Magic.h" | |||
17 | #include "llvm/IR/LLVMContext.h" | |||
18 | #include "llvm/Object/Archive.h" | |||
19 | #include "llvm/Object/ObjectFile.h" | |||
20 | #include "llvm/Object/SymbolicFile.h" | |||
21 | #include "llvm/Support/EndianStream.h" | |||
22 | #include "llvm/Support/Errc.h" | |||
23 | #include "llvm/Support/ErrorHandling.h" | |||
24 | #include "llvm/Support/Format.h" | |||
25 | #include "llvm/Support/Path.h" | |||
26 | #include "llvm/Support/ToolOutputFile.h" | |||
27 | #include "llvm/Support/raw_ostream.h" | |||
28 | ||||
29 | #include <map> | |||
30 | ||||
31 | #if !defined(_MSC_VER) && !defined(__MINGW32__) | |||
32 | #include <unistd.h> | |||
33 | #else | |||
34 | #include <io.h> | |||
35 | #endif | |||
36 | ||||
37 | using namespace llvm; | |||
38 | ||||
39 | NewArchiveMember::NewArchiveMember(MemoryBufferRef BufRef) | |||
40 | : Buf(MemoryBuffer::getMemBuffer(BufRef, false)), | |||
41 | MemberName(BufRef.getBufferIdentifier()) {} | |||
42 | ||||
43 | Expected<NewArchiveMember> | |||
44 | NewArchiveMember::getOldMember(const object::Archive::Child &OldMember, | |||
45 | bool Deterministic) { | |||
46 | Expected<llvm::MemoryBufferRef> BufOrErr = OldMember.getMemoryBufferRef(); | |||
47 | if (!BufOrErr) | |||
48 | return BufOrErr.takeError(); | |||
49 | ||||
50 | NewArchiveMember M; | |||
51 | M.Buf = MemoryBuffer::getMemBuffer(*BufOrErr, false); | |||
52 | M.MemberName = M.Buf->getBufferIdentifier(); | |||
53 | if (!Deterministic) { | |||
54 | auto ModTimeOrErr = OldMember.getLastModified(); | |||
55 | if (!ModTimeOrErr) | |||
56 | return ModTimeOrErr.takeError(); | |||
57 | M.ModTime = ModTimeOrErr.get(); | |||
58 | Expected<unsigned> UIDOrErr = OldMember.getUID(); | |||
59 | if (!UIDOrErr) | |||
60 | return UIDOrErr.takeError(); | |||
61 | M.UID = UIDOrErr.get(); | |||
62 | Expected<unsigned> GIDOrErr = OldMember.getGID(); | |||
63 | if (!GIDOrErr) | |||
64 | return GIDOrErr.takeError(); | |||
65 | M.GID = GIDOrErr.get(); | |||
66 | Expected<sys::fs::perms> AccessModeOrErr = OldMember.getAccessMode(); | |||
67 | if (!AccessModeOrErr) | |||
68 | return AccessModeOrErr.takeError(); | |||
69 | M.Perms = AccessModeOrErr.get(); | |||
70 | } | |||
71 | return std::move(M); | |||
72 | } | |||
73 | ||||
74 | Expected<NewArchiveMember> NewArchiveMember::getFile(StringRef FileName, | |||
75 | bool Deterministic) { | |||
76 | sys::fs::file_status Status; | |||
77 | int FD; | |||
78 | if (auto EC = sys::fs::openFileForRead(FileName, FD)) | |||
79 | return errorCodeToError(EC); | |||
80 | assert(FD != -1)((FD != -1) ? static_cast<void> (0) : __assert_fail ("FD != -1" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/Object/ArchiveWriter.cpp" , 80, __PRETTY_FUNCTION__)); | |||
81 | ||||
82 | if (auto EC = sys::fs::status(FD, Status)) | |||
83 | return errorCodeToError(EC); | |||
84 | ||||
85 | // Opening a directory doesn't make sense. Let it fail. | |||
86 | // Linux cannot open directories with open(2), although | |||
87 | // cygwin and *bsd can. | |||
88 | if (Status.type() == sys::fs::file_type::directory_file) | |||
89 | return errorCodeToError(make_error_code(errc::is_a_directory)); | |||
90 | ||||
91 | ErrorOr<std::unique_ptr<MemoryBuffer>> MemberBufferOrErr = | |||
92 | MemoryBuffer::getOpenFile(FD, FileName, Status.getSize(), false); | |||
93 | if (!MemberBufferOrErr) | |||
94 | return errorCodeToError(MemberBufferOrErr.getError()); | |||
95 | ||||
96 | if (close(FD) != 0) | |||
97 | return errorCodeToError(std::error_code(errno(*__errno_location ()), std::generic_category())); | |||
98 | ||||
99 | NewArchiveMember M; | |||
100 | M.Buf = std::move(*MemberBufferOrErr); | |||
101 | M.MemberName = M.Buf->getBufferIdentifier(); | |||
102 | if (!Deterministic) { | |||
103 | M.ModTime = std::chrono::time_point_cast<std::chrono::seconds>( | |||
104 | Status.getLastModificationTime()); | |||
105 | M.UID = Status.getUser(); | |||
106 | M.GID = Status.getGroup(); | |||
107 | M.Perms = Status.permissions(); | |||
108 | } | |||
109 | return std::move(M); | |||
110 | } | |||
111 | ||||
112 | template <typename T> | |||
113 | static void printWithSpacePadding(raw_ostream &OS, T Data, unsigned Size) { | |||
114 | uint64_t OldPos = OS.tell(); | |||
115 | OS << Data; | |||
116 | unsigned SizeSoFar = OS.tell() - OldPos; | |||
117 | assert(SizeSoFar <= Size && "Data doesn't fit in Size")((SizeSoFar <= Size && "Data doesn't fit in Size") ? static_cast<void> (0) : __assert_fail ("SizeSoFar <= Size && \"Data doesn't fit in Size\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/Object/ArchiveWriter.cpp" , 117, __PRETTY_FUNCTION__)); | |||
118 | OS.indent(Size - SizeSoFar); | |||
119 | } | |||
120 | ||||
121 | static bool isDarwin(object::Archive::Kind Kind) { | |||
122 | return Kind == object::Archive::K_DARWIN || | |||
123 | Kind == object::Archive::K_DARWIN64; | |||
124 | } | |||
125 | ||||
126 | static bool isBSDLike(object::Archive::Kind Kind) { | |||
127 | switch (Kind) { | |||
128 | case object::Archive::K_GNU: | |||
129 | case object::Archive::K_GNU64: | |||
130 | return false; | |||
131 | case object::Archive::K_BSD: | |||
132 | case object::Archive::K_DARWIN: | |||
133 | case object::Archive::K_DARWIN64: | |||
134 | return true; | |||
135 | case object::Archive::K_COFF: | |||
136 | break; | |||
137 | } | |||
138 | llvm_unreachable("not supported for writting")::llvm::llvm_unreachable_internal("not supported for writting" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/Object/ArchiveWriter.cpp" , 138); | |||
139 | } | |||
140 | ||||
141 | template <class T> | |||
142 | static void print(raw_ostream &Out, object::Archive::Kind Kind, T Val) { | |||
143 | support::endian::write(Out, Val, | |||
144 | isBSDLike(Kind) ? support::little : support::big); | |||
145 | } | |||
146 | ||||
147 | static void printRestOfMemberHeader( | |||
148 | raw_ostream &Out, const sys::TimePoint<std::chrono::seconds> &ModTime, | |||
149 | unsigned UID, unsigned GID, unsigned Perms, unsigned Size) { | |||
150 | printWithSpacePadding(Out, sys::toTimeT(ModTime), 12); | |||
151 | ||||
152 | // The format has only 6 chars for uid and gid. Truncate if the provided | |||
153 | // values don't fit. | |||
154 | printWithSpacePadding(Out, UID % 1000000, 6); | |||
155 | printWithSpacePadding(Out, GID % 1000000, 6); | |||
156 | ||||
157 | printWithSpacePadding(Out, format("%o", Perms), 8); | |||
158 | printWithSpacePadding(Out, Size, 10); | |||
159 | Out << "`\n"; | |||
160 | } | |||
161 | ||||
162 | static void | |||
163 | printGNUSmallMemberHeader(raw_ostream &Out, StringRef Name, | |||
164 | const sys::TimePoint<std::chrono::seconds> &ModTime, | |||
165 | unsigned UID, unsigned GID, unsigned Perms, | |||
166 | unsigned Size) { | |||
167 | printWithSpacePadding(Out, Twine(Name) + "/", 16); | |||
168 | printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, Size); | |||
169 | } | |||
170 | ||||
171 | static void | |||
172 | printBSDMemberHeader(raw_ostream &Out, uint64_t Pos, StringRef Name, | |||
173 | const sys::TimePoint<std::chrono::seconds> &ModTime, | |||
174 | unsigned UID, unsigned GID, unsigned Perms, | |||
175 | unsigned Size) { | |||
176 | uint64_t PosAfterHeader = Pos + 60 + Name.size(); | |||
177 | // Pad so that even 64 bit object files are aligned. | |||
178 | unsigned Pad = OffsetToAlignment(PosAfterHeader, 8); | |||
179 | unsigned NameWithPadding = Name.size() + Pad; | |||
180 | printWithSpacePadding(Out, Twine("#1/") + Twine(NameWithPadding), 16); | |||
181 | printRestOfMemberHeader(Out, ModTime, UID, GID, Perms, | |||
182 | NameWithPadding + Size); | |||
183 | Out << Name; | |||
184 | while (Pad--) | |||
185 | Out.write(uint8_t(0)); | |||
186 | } | |||
187 | ||||
188 | static bool useStringTable(bool Thin, StringRef Name) { | |||
189 | return Thin || Name.size() >= 16 || Name.contains('/'); | |||
190 | } | |||
191 | ||||
192 | static bool is64BitKind(object::Archive::Kind Kind) { | |||
193 | switch (Kind) { | |||
194 | case object::Archive::K_GNU: | |||
195 | case object::Archive::K_BSD: | |||
196 | case object::Archive::K_DARWIN: | |||
197 | case object::Archive::K_COFF: | |||
198 | return false; | |||
199 | case object::Archive::K_DARWIN64: | |||
200 | case object::Archive::K_GNU64: | |||
201 | return true; | |||
202 | } | |||
203 | llvm_unreachable("not supported for writting")::llvm::llvm_unreachable_internal("not supported for writting" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/Object/ArchiveWriter.cpp" , 203); | |||
204 | } | |||
205 | ||||
206 | static void | |||
207 | printMemberHeader(raw_ostream &Out, uint64_t Pos, raw_ostream &StringTable, | |||
208 | StringMap<uint64_t> &MemberNames, object::Archive::Kind Kind, | |||
209 | bool Thin, const NewArchiveMember &M, | |||
210 | sys::TimePoint<std::chrono::seconds> ModTime, unsigned Size) { | |||
211 | if (isBSDLike(Kind)) | |||
212 | return printBSDMemberHeader(Out, Pos, M.MemberName, ModTime, M.UID, M.GID, | |||
213 | M.Perms, Size); | |||
214 | if (!useStringTable(Thin, M.MemberName)) | |||
215 | return printGNUSmallMemberHeader(Out, M.MemberName, ModTime, M.UID, M.GID, | |||
216 | M.Perms, Size); | |||
217 | Out << '/'; | |||
218 | uint64_t NamePos; | |||
219 | if (Thin) { | |||
220 | NamePos = StringTable.tell(); | |||
221 | StringTable << M.MemberName << "/\n"; | |||
222 | } else { | |||
223 | auto Insertion = MemberNames.insert({M.MemberName, uint64_t(0)}); | |||
224 | if (Insertion.second) { | |||
225 | Insertion.first->second = StringTable.tell(); | |||
226 | StringTable << M.MemberName << "/\n"; | |||
227 | } | |||
228 | NamePos = Insertion.first->second; | |||
229 | } | |||
230 | printWithSpacePadding(Out, NamePos, 15); | |||
231 | printRestOfMemberHeader(Out, ModTime, M.UID, M.GID, M.Perms, Size); | |||
232 | } | |||
233 | ||||
234 | namespace { | |||
235 | struct MemberData { | |||
236 | std::vector<unsigned> Symbols; | |||
237 | std::string Header; | |||
238 | StringRef Data; | |||
239 | StringRef Padding; | |||
240 | }; | |||
241 | } // namespace | |||
242 | ||||
243 | static MemberData computeStringTable(StringRef Names) { | |||
244 | unsigned Size = Names.size(); | |||
245 | unsigned Pad = OffsetToAlignment(Size, 2); | |||
246 | std::string Header; | |||
247 | raw_string_ostream Out(Header); | |||
248 | printWithSpacePadding(Out, "//", 48); | |||
249 | printWithSpacePadding(Out, Size + Pad, 10); | |||
250 | Out << "`\n"; | |||
251 | Out.flush(); | |||
252 | return {{}, std::move(Header), Names, Pad ? "\n" : ""}; | |||
253 | } | |||
254 | ||||
255 | static sys::TimePoint<std::chrono::seconds> now(bool Deterministic) { | |||
256 | using namespace std::chrono; | |||
257 | ||||
258 | if (!Deterministic) | |||
259 | return time_point_cast<seconds>(system_clock::now()); | |||
260 | return sys::TimePoint<seconds>(); | |||
261 | } | |||
262 | ||||
263 | static bool isArchiveSymbol(const object::BasicSymbolRef &S) { | |||
264 | uint32_t Symflags = S.getFlags(); | |||
265 | if (Symflags & object::SymbolRef::SF_FormatSpecific) | |||
266 | return false; | |||
267 | if (!(Symflags & object::SymbolRef::SF_Global)) | |||
268 | return false; | |||
269 | if (Symflags & object::SymbolRef::SF_Undefined) | |||
270 | return false; | |||
271 | return true; | |||
272 | } | |||
273 | ||||
274 | static void printNBits(raw_ostream &Out, object::Archive::Kind Kind, | |||
275 | uint64_t Val) { | |||
276 | if (is64BitKind(Kind)) | |||
277 | print<uint64_t>(Out, Kind, Val); | |||
278 | else | |||
279 | print<uint32_t>(Out, Kind, Val); | |||
280 | } | |||
281 | ||||
282 | static void writeSymbolTable(raw_ostream &Out, object::Archive::Kind Kind, | |||
283 | bool Deterministic, ArrayRef<MemberData> Members, | |||
284 | StringRef StringTable) { | |||
285 | // We don't write a symbol table on an archive with no members -- except on | |||
286 | // Darwin, where the linker will abort unless the archive has a symbol table. | |||
287 | if (StringTable.empty() && !isDarwin(Kind)) | |||
288 | return; | |||
289 | ||||
290 | unsigned NumSyms = 0; | |||
291 | for (const MemberData &M : Members) | |||
292 | NumSyms += M.Symbols.size(); | |||
293 | ||||
294 | unsigned Size = 0; | |||
295 | unsigned OffsetSize = is64BitKind(Kind) ? sizeof(uint64_t) : sizeof(uint32_t); | |||
296 | ||||
297 | Size += OffsetSize; // Number of entries | |||
298 | if (isBSDLike(Kind)) | |||
299 | Size += NumSyms * OffsetSize * 2; // Table | |||
300 | else | |||
301 | Size += NumSyms * OffsetSize; // Table | |||
302 | if (isBSDLike(Kind)) | |||
303 | Size += OffsetSize; // byte count | |||
304 | Size += StringTable.size(); | |||
305 | // ld64 expects the members to be 8-byte aligned for 64-bit content and at | |||
306 | // least 4-byte aligned for 32-bit content. Opt for the larger encoding | |||
307 | // uniformly. | |||
308 | // We do this for all bsd formats because it simplifies aligning members. | |||
309 | unsigned Alignment = isBSDLike(Kind) ? 8 : 2; | |||
310 | unsigned Pad = OffsetToAlignment(Size, Alignment); | |||
311 | Size += Pad; | |||
312 | ||||
313 | if (isBSDLike(Kind)) { | |||
314 | const char *Name = is64BitKind(Kind) ? "__.SYMDEF_64" : "__.SYMDEF"; | |||
315 | printBSDMemberHeader(Out, Out.tell(), Name, now(Deterministic), 0, 0, 0, | |||
316 | Size); | |||
317 | } else { | |||
318 | const char *Name = is64BitKind(Kind) ? "/SYM64" : ""; | |||
319 | printGNUSmallMemberHeader(Out, Name, now(Deterministic), 0, 0, 0, Size); | |||
320 | } | |||
321 | ||||
322 | uint64_t Pos = Out.tell() + Size; | |||
323 | ||||
324 | if (isBSDLike(Kind)) | |||
325 | printNBits(Out, Kind, NumSyms * 2 * OffsetSize); | |||
326 | else | |||
327 | printNBits(Out, Kind, NumSyms); | |||
328 | ||||
329 | for (const MemberData &M : Members) { | |||
330 | for (unsigned StringOffset : M.Symbols) { | |||
331 | if (isBSDLike(Kind)) | |||
332 | printNBits(Out, Kind, StringOffset); | |||
333 | printNBits(Out, Kind, Pos); // member offset | |||
334 | } | |||
335 | Pos += M.Header.size() + M.Data.size() + M.Padding.size(); | |||
336 | } | |||
337 | ||||
338 | if (isBSDLike(Kind)) | |||
339 | // byte count of the string table | |||
340 | printNBits(Out, Kind, StringTable.size()); | |||
341 | Out << StringTable; | |||
342 | ||||
343 | while (Pad--) | |||
344 | Out.write(uint8_t(0)); | |||
345 | } | |||
346 | ||||
347 | static Expected<std::vector<unsigned>> | |||
348 | getSymbols(MemoryBufferRef Buf, raw_ostream &SymNames, bool &HasObject) { | |||
349 | std::vector<unsigned> Ret; | |||
350 | ||||
351 | // In the scenario when LLVMContext is populated SymbolicFile will contain a | |||
352 | // reference to it, thus SymbolicFile should be destroyed first. | |||
353 | LLVMContext Context; | |||
354 | std::unique_ptr<object::SymbolicFile> Obj; | |||
355 | if (identify_magic(Buf.getBuffer()) == file_magic::bitcode) { | |||
356 | auto ObjOrErr = object::SymbolicFile::createSymbolicFile( | |||
357 | Buf, file_magic::bitcode, &Context); | |||
358 | if (!ObjOrErr) { | |||
359 | // FIXME: check only for "not an object file" errors. | |||
360 | consumeError(ObjOrErr.takeError()); | |||
361 | return Ret; | |||
362 | } | |||
363 | Obj = std::move(*ObjOrErr); | |||
364 | } else { | |||
365 | auto ObjOrErr = object::SymbolicFile::createSymbolicFile(Buf); | |||
366 | if (!ObjOrErr) { | |||
367 | // FIXME: check only for "not an object file" errors. | |||
368 | consumeError(ObjOrErr.takeError()); | |||
369 | return Ret; | |||
370 | } | |||
371 | Obj = std::move(*ObjOrErr); | |||
372 | } | |||
373 | ||||
374 | HasObject = true; | |||
375 | for (const object::BasicSymbolRef &S : Obj->symbols()) { | |||
376 | if (!isArchiveSymbol(S)) | |||
377 | continue; | |||
378 | Ret.push_back(SymNames.tell()); | |||
379 | if (Error E = S.printName(SymNames)) | |||
380 | return std::move(E); | |||
381 | SymNames << '\0'; | |||
382 | } | |||
383 | return Ret; | |||
384 | } | |||
385 | ||||
386 | static Expected<std::vector<MemberData>> | |||
387 | computeMemberData(raw_ostream &StringTable, raw_ostream &SymNames, | |||
388 | object::Archive::Kind Kind, bool Thin, bool Deterministic, | |||
389 | ArrayRef<NewArchiveMember> NewMembers) { | |||
390 | static char PaddingData[8] = {'\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n'}; | |||
391 | ||||
392 | // This ignores the symbol table, but we only need the value mod 8 and the | |||
393 | // symbol table is aligned to be a multiple of 8 bytes | |||
394 | uint64_t Pos = 0; | |||
395 | ||||
396 | std::vector<MemberData> Ret; | |||
397 | bool HasObject = false; | |||
398 | ||||
399 | // Deduplicate long member names in the string table and reuse earlier name | |||
400 | // offsets. This especially saves space for COFF Import libraries where all | |||
401 | // members have the same name. | |||
402 | StringMap<uint64_t> MemberNames; | |||
403 | ||||
404 | // UniqueTimestamps is a special case to improve debugging on Darwin: | |||
405 | // | |||
406 | // The Darwin linker does not link debug info into the final | |||
407 | // binary. Instead, it emits entries of type N_OSO in in the output | |||
408 | // binary's symbol table, containing references to the linked-in | |||
409 | // object files. Using that reference, the debugger can read the | |||
410 | // debug data directly from the object files. Alternatively, an | |||
411 | // invocation of 'dsymutil' will link the debug data from the object | |||
412 | // files into a dSYM bundle, which can be loaded by the debugger, | |||
413 | // instead of the object files. | |||
414 | // | |||
415 | // For an object file, the N_OSO entries contain the absolute path | |||
416 | // path to the file, and the file's timestamp. For an object | |||
417 | // included in an archive, the path is formatted like | |||
418 | // "/absolute/path/to/archive.a(member.o)", and the timestamp is the | |||
419 | // archive member's timestamp, rather than the archive's timestamp. | |||
420 | // | |||
421 | // However, this doesn't always uniquely identify an object within | |||
422 | // an archive -- an archive file can have multiple entries with the | |||
423 | // same filename. (This will happen commonly if the original object | |||
424 | // files started in different directories.) The only way they get | |||
425 | // distinguished, then, is via the timestamp. But this process is | |||
426 | // unable to find the correct object file in the archive when there | |||
427 | // are two files of the same name and timestamp. | |||
428 | // | |||
429 | // Additionally, timestamp==0 is treated specially, and causes the | |||
430 | // timestamp to be ignored as a match criteria. | |||
431 | // | |||
432 | // That will "usually" work out okay when creating an archive not in | |||
433 | // deterministic timestamp mode, because the objects will probably | |||
434 | // have been created at different timestamps. | |||
435 | // | |||
436 | // To ameliorate this problem, in deterministic archive mode (which | |||
437 | // is the default), on Darwin we will emit a unique non-zero | |||
438 | // timestamp for each entry with a duplicated name. This is still | |||
439 | // deterministic: the only thing affecting that timestamp is the | |||
440 | // order of the files in the resultant archive. | |||
441 | // | |||
442 | // See also the functions that handle the lookup: | |||
443 | // in lldb: ObjectContainerBSDArchive::Archive::FindObject() | |||
444 | // in llvm/tools/dsymutil: BinaryHolder::GetArchiveMemberBuffers(). | |||
445 | bool UniqueTimestamps = Deterministic && isDarwin(Kind); | |||
446 | std::map<StringRef, unsigned> FilenameCount; | |||
447 | if (UniqueTimestamps) { | |||
448 | for (const NewArchiveMember &M : NewMembers) | |||
449 | FilenameCount[M.MemberName]++; | |||
450 | for (auto &Entry : FilenameCount) | |||
451 | Entry.second = Entry.second > 1 ? 1 : 0; | |||
452 | } | |||
453 | ||||
454 | for (const NewArchiveMember &M : NewMembers) { | |||
455 | std::string Header; | |||
456 | raw_string_ostream Out(Header); | |||
457 | ||||
458 | MemoryBufferRef Buf = M.Buf->getMemBufferRef(); | |||
459 | StringRef Data = Thin ? "" : Buf.getBuffer(); | |||
460 | ||||
461 | // ld64 expects the members to be 8-byte aligned for 64-bit content and at | |||
462 | // least 4-byte aligned for 32-bit content. Opt for the larger encoding | |||
463 | // uniformly. This matches the behaviour with cctools and ensures that ld64 | |||
464 | // is happy with archives that we generate. | |||
465 | unsigned MemberPadding = | |||
466 | isDarwin(Kind) ? OffsetToAlignment(Data.size(), 8) : 0; | |||
467 | unsigned TailPadding = OffsetToAlignment(Data.size() + MemberPadding, 2); | |||
468 | StringRef Padding = StringRef(PaddingData, MemberPadding + TailPadding); | |||
469 | ||||
470 | sys::TimePoint<std::chrono::seconds> ModTime; | |||
471 | if (UniqueTimestamps) | |||
472 | // Increment timestamp for each file of a given name. | |||
473 | ModTime = sys::toTimePoint(FilenameCount[M.MemberName]++); | |||
474 | else | |||
475 | ModTime = M.ModTime; | |||
476 | printMemberHeader(Out, Pos, StringTable, MemberNames, Kind, Thin, M, | |||
477 | ModTime, Buf.getBufferSize() + MemberPadding); | |||
478 | Out.flush(); | |||
479 | ||||
480 | Expected<std::vector<unsigned>> Symbols = | |||
481 | getSymbols(Buf, SymNames, HasObject); | |||
482 | if (auto E = Symbols.takeError()) | |||
483 | return std::move(E); | |||
484 | ||||
485 | Pos += Header.size() + Data.size() + Padding.size(); | |||
486 | Ret.push_back({std::move(*Symbols), std::move(Header), Data, Padding}); | |||
487 | } | |||
488 | // If there are no symbols, emit an empty symbol table, to satisfy Solaris | |||
489 | // tools, older versions of which expect a symbol table in a non-empty | |||
490 | // archive, regardless of whether there are any symbols in it. | |||
491 | if (HasObject && SymNames.tell() == 0) | |||
492 | SymNames << '\0' << '\0' << '\0'; | |||
493 | return Ret; | |||
494 | } | |||
495 | ||||
496 | namespace llvm { | |||
497 | ||||
498 | static ErrorOr<SmallString<128>> canonicalizePath(StringRef P) { | |||
499 | SmallString<128> Ret = P; | |||
500 | std::error_code Err = sys::fs::make_absolute(Ret); | |||
501 | if (Err) | |||
502 | return Err; | |||
503 | sys::path::remove_dots(Ret, /*removedotdot*/ true); | |||
504 | return Ret; | |||
505 | } | |||
506 | ||||
507 | // Compute the relative path from From to To. | |||
508 | Expected<std::string> computeArchiveRelativePath(StringRef From, StringRef To) { | |||
509 | ErrorOr<SmallString<128>> PathToOrErr = canonicalizePath(To); | |||
510 | ErrorOr<SmallString<128>> DirFromOrErr = canonicalizePath(From); | |||
511 | if (!PathToOrErr || !DirFromOrErr) | |||
512 | return errorCodeToError(std::error_code(errno(*__errno_location ()), std::generic_category())); | |||
513 | ||||
514 | const SmallString<128> &PathTo = *PathToOrErr; | |||
515 | const SmallString<128> &DirFrom = sys::path::parent_path(*DirFromOrErr); | |||
516 | ||||
517 | // Can't construct a relative path between different roots | |||
518 | if (sys::path::root_name(PathTo) != sys::path::root_name(DirFrom)) | |||
519 | return sys::path::convert_to_slash(PathTo); | |||
520 | ||||
521 | // Skip common prefixes | |||
522 | auto FromTo = | |||
523 | std::mismatch(sys::path::begin(DirFrom), sys::path::end(DirFrom), | |||
524 | sys::path::begin(PathTo)); | |||
525 | auto FromI = FromTo.first; | |||
526 | auto ToI = FromTo.second; | |||
527 | ||||
528 | // Construct relative path | |||
529 | SmallString<128> Relative; | |||
530 | for (auto FromE = sys::path::end(DirFrom); FromI != FromE; ++FromI) | |||
531 | sys::path::append(Relative, sys::path::Style::posix, ".."); | |||
532 | ||||
533 | for (auto ToE = sys::path::end(PathTo); ToI != ToE; ++ToI) | |||
534 | sys::path::append(Relative, sys::path::Style::posix, *ToI); | |||
535 | ||||
536 | return Relative.str(); | |||
537 | } | |||
538 | ||||
539 | Error writeArchive(StringRef ArcName, ArrayRef<NewArchiveMember> NewMembers, | |||
540 | bool WriteSymtab, object::Archive::Kind Kind, | |||
541 | bool Deterministic, bool Thin, | |||
542 | std::unique_ptr<MemoryBuffer> OldArchiveBuf) { | |||
543 | assert((!Thin || !isBSDLike(Kind)) && "Only the gnu format has a thin mode")(((!Thin || !isBSDLike(Kind)) && "Only the gnu format has a thin mode" ) ? static_cast<void> (0) : __assert_fail ("(!Thin || !isBSDLike(Kind)) && \"Only the gnu format has a thin mode\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/Object/ArchiveWriter.cpp" , 543, __PRETTY_FUNCTION__)); | |||
| ||||
544 | ||||
545 | SmallString<0> SymNamesBuf; | |||
546 | raw_svector_ostream SymNames(SymNamesBuf); | |||
547 | SmallString<0> StringTableBuf; | |||
548 | raw_svector_ostream StringTable(StringTableBuf); | |||
549 | ||||
550 | Expected<std::vector<MemberData>> DataOrErr = computeMemberData( | |||
551 | StringTable, SymNames, Kind, Thin, Deterministic, NewMembers); | |||
552 | if (Error E = DataOrErr.takeError()) | |||
553 | return E; | |||
554 | std::vector<MemberData> &Data = *DataOrErr; | |||
555 | ||||
556 | if (!StringTableBuf.empty()) | |||
557 | Data.insert(Data.begin(), computeStringTable(StringTableBuf)); | |||
558 | ||||
559 | // We would like to detect if we need to switch to a 64-bit symbol table. | |||
560 | if (WriteSymtab) { | |||
561 | uint64_t MaxOffset = 0; | |||
562 | uint64_t LastOffset = MaxOffset; | |||
563 | for (const auto &M : Data) { | |||
564 | // Record the start of the member's offset | |||
565 | LastOffset = MaxOffset; | |||
566 | // Account for the size of each part associated with the member. | |||
567 | MaxOffset += M.Header.size() + M.Data.size() + M.Padding.size(); | |||
568 | // We assume 32-bit symbols to see if 32-bit symbols are possible or not. | |||
569 | MaxOffset += M.Symbols.size() * 4; | |||
570 | } | |||
571 | ||||
572 | // The SYM64 format is used when an archive's member offsets are larger than | |||
573 | // 32-bits can hold. The need for this shift in format is detected by | |||
574 | // writeArchive. To test this we need to generate a file with a member that | |||
575 | // has an offset larger than 32-bits but this demands a very slow test. To | |||
576 | // speed the test up we use this environment variable to pretend like the | |||
577 | // cutoff happens before 32-bits and instead happens at some much smaller | |||
578 | // value. | |||
579 | const char *Sym64Env = std::getenv("SYM64_THRESHOLD"); | |||
580 | int Sym64Threshold = 32; | |||
581 | if (Sym64Env) | |||
582 | StringRef(Sym64Env).getAsInteger(10, Sym64Threshold); | |||
583 | ||||
584 | // If LastOffset isn't going to fit in a 32-bit varible we need to switch | |||
585 | // to 64-bit. Note that the file can be larger than 4GB as long as the last | |||
586 | // member starts before the 4GB offset. | |||
587 | if (LastOffset >= (1ULL << Sym64Threshold)) { | |||
588 | if (Kind == object::Archive::K_DARWIN) | |||
589 | Kind = object::Archive::K_DARWIN64; | |||
590 | else | |||
591 | Kind = object::Archive::K_GNU64; | |||
592 | } | |||
593 | } | |||
594 | ||||
595 | Expected<sys::fs::TempFile> Temp = | |||
596 | sys::fs::TempFile::create(ArcName + ".temp-archive-%%%%%%%.a"); | |||
597 | if (!Temp) | |||
598 | return Temp.takeError(); | |||
599 | ||||
600 | raw_fd_ostream Out(Temp->FD, false); | |||
601 | if (Thin) | |||
602 | Out << "!<thin>\n"; | |||
603 | else | |||
604 | Out << "!<arch>\n"; | |||
605 | ||||
606 | if (WriteSymtab) | |||
607 | writeSymbolTable(Out, Kind, Deterministic, Data, SymNamesBuf); | |||
608 | ||||
609 | for (const MemberData &M : Data) | |||
610 | Out << M.Header << M.Data << M.Padding; | |||
611 | ||||
612 | Out.flush(); | |||
613 | ||||
614 | // At this point, we no longer need whatever backing memory | |||
615 | // was used to generate the NewMembers. On Windows, this buffer | |||
616 | // could be a mapped view of the file we want to replace (if | |||
617 | // we're updating an existing archive, say). In that case, the | |||
618 | // rename would still succeed, but it would leave behind a | |||
619 | // temporary file (actually the original file renamed) because | |||
620 | // a file cannot be deleted while there's a handle open on it, | |||
621 | // only renamed. So by freeing this buffer, this ensures that | |||
622 | // the last open handle on the destination file, if any, is | |||
623 | // closed before we attempt to rename. | |||
624 | OldArchiveBuf.reset(); | |||
625 | ||||
626 | return Temp->keep(ArcName); | |||
627 | } | |||
628 | ||||
629 | } // namespace llvm |
1 | //===- llvm/Support/Error.h - Recoverable error handling --------*- C++ -*-===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | // This file defines an API used to report recoverable errors. | |||
10 | // | |||
11 | //===----------------------------------------------------------------------===// | |||
12 | ||||
13 | #ifndef LLVM_SUPPORT_ERROR_H | |||
14 | #define LLVM_SUPPORT_ERROR_H | |||
15 | ||||
16 | #include "llvm-c/Error.h" | |||
17 | #include "llvm/ADT/STLExtras.h" | |||
18 | #include "llvm/ADT/SmallVector.h" | |||
19 | #include "llvm/ADT/StringExtras.h" | |||
20 | #include "llvm/ADT/Twine.h" | |||
21 | #include "llvm/Config/abi-breaking.h" | |||
22 | #include "llvm/Support/AlignOf.h" | |||
23 | #include "llvm/Support/Compiler.h" | |||
24 | #include "llvm/Support/Debug.h" | |||
25 | #include "llvm/Support/ErrorHandling.h" | |||
26 | #include "llvm/Support/ErrorOr.h" | |||
27 | #include "llvm/Support/Format.h" | |||
28 | #include "llvm/Support/raw_ostream.h" | |||
29 | #include <algorithm> | |||
30 | #include <cassert> | |||
31 | #include <cstdint> | |||
32 | #include <cstdlib> | |||
33 | #include <functional> | |||
34 | #include <memory> | |||
35 | #include <new> | |||
36 | #include <string> | |||
37 | #include <system_error> | |||
38 | #include <type_traits> | |||
39 | #include <utility> | |||
40 | #include <vector> | |||
41 | ||||
42 | namespace llvm { | |||
43 | ||||
44 | class ErrorSuccess; | |||
45 | ||||
46 | /// Base class for error info classes. Do not extend this directly: Extend | |||
47 | /// the ErrorInfo template subclass instead. | |||
48 | class ErrorInfoBase { | |||
49 | public: | |||
50 | virtual ~ErrorInfoBase() = default; | |||
51 | ||||
52 | /// Print an error message to an output stream. | |||
53 | virtual void log(raw_ostream &OS) const = 0; | |||
54 | ||||
55 | /// Return the error message as a string. | |||
56 | virtual std::string message() const { | |||
57 | std::string Msg; | |||
58 | raw_string_ostream OS(Msg); | |||
59 | log(OS); | |||
60 | return OS.str(); | |||
61 | } | |||
62 | ||||
63 | /// Convert this error to a std::error_code. | |||
64 | /// | |||
65 | /// This is a temporary crutch to enable interaction with code still | |||
66 | /// using std::error_code. It will be removed in the future. | |||
67 | virtual std::error_code convertToErrorCode() const = 0; | |||
68 | ||||
69 | // Returns the class ID for this type. | |||
70 | static const void *classID() { return &ID; } | |||
71 | ||||
72 | // Returns the class ID for the dynamic type of this ErrorInfoBase instance. | |||
73 | virtual const void *dynamicClassID() const = 0; | |||
74 | ||||
75 | // Check whether this instance is a subclass of the class identified by | |||
76 | // ClassID. | |||
77 | virtual bool isA(const void *const ClassID) const { | |||
78 | return ClassID == classID(); | |||
79 | } | |||
80 | ||||
81 | // Check whether this instance is a subclass of ErrorInfoT. | |||
82 | template <typename ErrorInfoT> bool isA() const { | |||
83 | return isA(ErrorInfoT::classID()); | |||
84 | } | |||
85 | ||||
86 | private: | |||
87 | virtual void anchor(); | |||
88 | ||||
89 | static char ID; | |||
90 | }; | |||
91 | ||||
92 | /// Lightweight error class with error context and mandatory checking. | |||
93 | /// | |||
94 | /// Instances of this class wrap a ErrorInfoBase pointer. Failure states | |||
95 | /// are represented by setting the pointer to a ErrorInfoBase subclass | |||
96 | /// instance containing information describing the failure. Success is | |||
97 | /// represented by a null pointer value. | |||
98 | /// | |||
99 | /// Instances of Error also contains a 'Checked' flag, which must be set | |||
100 | /// before the destructor is called, otherwise the destructor will trigger a | |||
101 | /// runtime error. This enforces at runtime the requirement that all Error | |||
102 | /// instances be checked or returned to the caller. | |||
103 | /// | |||
104 | /// There are two ways to set the checked flag, depending on what state the | |||
105 | /// Error instance is in. For Error instances indicating success, it | |||
106 | /// is sufficient to invoke the boolean conversion operator. E.g.: | |||
107 | /// | |||
108 | /// @code{.cpp} | |||
109 | /// Error foo(<...>); | |||
110 | /// | |||
111 | /// if (auto E = foo(<...>)) | |||
112 | /// return E; // <- Return E if it is in the error state. | |||
113 | /// // We have verified that E was in the success state. It can now be safely | |||
114 | /// // destroyed. | |||
115 | /// @endcode | |||
116 | /// | |||
117 | /// A success value *can not* be dropped. For example, just calling 'foo(<...>)' | |||
118 | /// without testing the return value will raise a runtime error, even if foo | |||
119 | /// returns success. | |||
120 | /// | |||
121 | /// For Error instances representing failure, you must use either the | |||
122 | /// handleErrors or handleAllErrors function with a typed handler. E.g.: | |||
123 | /// | |||
124 | /// @code{.cpp} | |||
125 | /// class MyErrorInfo : public ErrorInfo<MyErrorInfo> { | |||
126 | /// // Custom error info. | |||
127 | /// }; | |||
128 | /// | |||
129 | /// Error foo(<...>) { return make_error<MyErrorInfo>(...); } | |||
130 | /// | |||
131 | /// auto E = foo(<...>); // <- foo returns failure with MyErrorInfo. | |||
132 | /// auto NewE = | |||
133 | /// handleErrors(E, | |||
134 | /// [](const MyErrorInfo &M) { | |||
135 | /// // Deal with the error. | |||
136 | /// }, | |||
137 | /// [](std::unique_ptr<OtherError> M) -> Error { | |||
138 | /// if (canHandle(*M)) { | |||
139 | /// // handle error. | |||
140 | /// return Error::success(); | |||
141 | /// } | |||
142 | /// // Couldn't handle this error instance. Pass it up the stack. | |||
143 | /// return Error(std::move(M)); | |||
144 | /// ); | |||
145 | /// // Note - we must check or return NewE in case any of the handlers | |||
146 | /// // returned a new error. | |||
147 | /// @endcode | |||
148 | /// | |||
149 | /// The handleAllErrors function is identical to handleErrors, except | |||
150 | /// that it has a void return type, and requires all errors to be handled and | |||
151 | /// no new errors be returned. It prevents errors (assuming they can all be | |||
152 | /// handled) from having to be bubbled all the way to the top-level. | |||
153 | /// | |||
154 | /// *All* Error instances must be checked before destruction, even if | |||
155 | /// they're moved-assigned or constructed from Success values that have already | |||
156 | /// been checked. This enforces checking through all levels of the call stack. | |||
157 | class LLVM_NODISCARD[[clang::warn_unused_result]] Error { | |||
158 | // Both ErrorList and FileError need to be able to yank ErrorInfoBase | |||
159 | // pointers out of this class to add to the error list. | |||
160 | friend class ErrorList; | |||
161 | friend class FileError; | |||
162 | ||||
163 | // handleErrors needs to be able to set the Checked flag. | |||
164 | template <typename... HandlerTs> | |||
165 | friend Error handleErrors(Error E, HandlerTs &&... Handlers); | |||
166 | ||||
167 | // Expected<T> needs to be able to steal the payload when constructed from an | |||
168 | // error. | |||
169 | template <typename T> friend class Expected; | |||
170 | ||||
171 | // wrap needs to be able to steal the payload. | |||
172 | friend LLVMErrorRef wrap(Error); | |||
173 | ||||
174 | protected: | |||
175 | /// Create a success value. Prefer using 'Error::success()' for readability | |||
176 | Error() { | |||
177 | setPtr(nullptr); | |||
178 | setChecked(false); | |||
179 | } | |||
180 | ||||
181 | public: | |||
182 | /// Create a success value. | |||
183 | static ErrorSuccess success(); | |||
184 | ||||
185 | // Errors are not copy-constructable. | |||
186 | Error(const Error &Other) = delete; | |||
187 | ||||
188 | /// Move-construct an error value. The newly constructed error is considered | |||
189 | /// unchecked, even if the source error had been checked. The original error | |||
190 | /// becomes a checked Success value, regardless of its original state. | |||
191 | Error(Error &&Other) { | |||
192 | setChecked(true); | |||
193 | *this = std::move(Other); | |||
194 | } | |||
195 | ||||
196 | /// Create an error value. Prefer using the 'make_error' function, but | |||
197 | /// this constructor can be useful when "re-throwing" errors from handlers. | |||
198 | Error(std::unique_ptr<ErrorInfoBase> Payload) { | |||
199 | setPtr(Payload.release()); | |||
200 | setChecked(false); | |||
| ||||
201 | } | |||
202 | ||||
203 | // Errors are not copy-assignable. | |||
204 | Error &operator=(const Error &Other) = delete; | |||
205 | ||||
206 | /// Move-assign an error value. The current error must represent success, you | |||
207 | /// you cannot overwrite an unhandled error. The current error is then | |||
208 | /// considered unchecked. The source error becomes a checked success value, | |||
209 | /// regardless of its original state. | |||
210 | Error &operator=(Error &&Other) { | |||
211 | // Don't allow overwriting of unchecked values. | |||
212 | assertIsChecked(); | |||
213 | setPtr(Other.getPtr()); | |||
214 | ||||
215 | // This Error is unchecked, even if the source error was checked. | |||
216 | setChecked(false); | |||
217 | ||||
218 | // Null out Other's payload and set its checked bit. | |||
219 | Other.setPtr(nullptr); | |||
220 | Other.setChecked(true); | |||
221 | ||||
222 | return *this; | |||
223 | } | |||
224 | ||||
225 | /// Destroy a Error. Fails with a call to abort() if the error is | |||
226 | /// unchecked. | |||
227 | ~Error() { | |||
228 | assertIsChecked(); | |||
229 | delete getPtr(); | |||
230 | } | |||
231 | ||||
232 | /// Bool conversion. Returns true if this Error is in a failure state, | |||
233 | /// and false if it is in an accept state. If the error is in a Success state | |||
234 | /// it will be considered checked. | |||
235 | explicit operator bool() { | |||
236 | setChecked(getPtr() == nullptr); | |||
237 | return getPtr() != nullptr; | |||
238 | } | |||
239 | ||||
240 | /// Check whether one error is a subclass of another. | |||
241 | template <typename ErrT> bool isA() const { | |||
242 | return getPtr() && getPtr()->isA(ErrT::classID()); | |||
243 | } | |||
244 | ||||
245 | /// Returns the dynamic class id of this error, or null if this is a success | |||
246 | /// value. | |||
247 | const void* dynamicClassID() const { | |||
248 | if (!getPtr()) | |||
249 | return nullptr; | |||
250 | return getPtr()->dynamicClassID(); | |||
251 | } | |||
252 | ||||
253 | private: | |||
254 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
255 | // assertIsChecked() happens very frequently, but under normal circumstances | |||
256 | // is supposed to be a no-op. So we want it to be inlined, but having a bunch | |||
257 | // of debug prints can cause the function to be too large for inlining. So | |||
258 | // it's important that we define this function out of line so that it can't be | |||
259 | // inlined. | |||
260 | LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn)) | |||
261 | void fatalUncheckedError() const; | |||
262 | #endif | |||
263 | ||||
264 | void assertIsChecked() { | |||
265 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
266 | if (LLVM_UNLIKELY(!getChecked() || getPtr())__builtin_expect((bool)(!getChecked() || getPtr()), false)) | |||
267 | fatalUncheckedError(); | |||
268 | #endif | |||
269 | } | |||
270 | ||||
271 | ErrorInfoBase *getPtr() const { | |||
272 | return reinterpret_cast<ErrorInfoBase*>( | |||
273 | reinterpret_cast<uintptr_t>(Payload) & | |||
274 | ~static_cast<uintptr_t>(0x1)); | |||
275 | } | |||
276 | ||||
277 | void setPtr(ErrorInfoBase *EI) { | |||
278 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
279 | Payload = reinterpret_cast<ErrorInfoBase*>( | |||
280 | (reinterpret_cast<uintptr_t>(EI) & | |||
281 | ~static_cast<uintptr_t>(0x1)) | | |||
282 | (reinterpret_cast<uintptr_t>(Payload) & 0x1)); | |||
283 | #else | |||
284 | Payload = EI; | |||
285 | #endif | |||
286 | } | |||
287 | ||||
288 | bool getChecked() const { | |||
289 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
290 | return (reinterpret_cast<uintptr_t>(Payload) & 0x1) == 0; | |||
291 | #else | |||
292 | return true; | |||
293 | #endif | |||
294 | } | |||
295 | ||||
296 | void setChecked(bool V) { | |||
297 | Payload = reinterpret_cast<ErrorInfoBase*>( | |||
298 | (reinterpret_cast<uintptr_t>(Payload) & | |||
299 | ~static_cast<uintptr_t>(0x1)) | | |||
300 | (V ? 0 : 1)); | |||
301 | } | |||
302 | ||||
303 | std::unique_ptr<ErrorInfoBase> takePayload() { | |||
304 | std::unique_ptr<ErrorInfoBase> Tmp(getPtr()); | |||
305 | setPtr(nullptr); | |||
306 | setChecked(true); | |||
307 | return Tmp; | |||
308 | } | |||
309 | ||||
310 | friend raw_ostream &operator<<(raw_ostream &OS, const Error &E) { | |||
311 | if (auto P = E.getPtr()) | |||
312 | P->log(OS); | |||
313 | else | |||
314 | OS << "success"; | |||
315 | return OS; | |||
316 | } | |||
317 | ||||
318 | ErrorInfoBase *Payload = nullptr; | |||
319 | }; | |||
320 | ||||
321 | /// Subclass of Error for the sole purpose of identifying the success path in | |||
322 | /// the type system. This allows to catch invalid conversion to Expected<T> at | |||
323 | /// compile time. | |||
324 | class ErrorSuccess final : public Error {}; | |||
325 | ||||
326 | inline ErrorSuccess Error::success() { return ErrorSuccess(); } | |||
327 | ||||
328 | /// Make a Error instance representing failure using the given error info | |||
329 | /// type. | |||
330 | template <typename ErrT, typename... ArgTs> Error make_error(ArgTs &&... Args) { | |||
331 | return Error(llvm::make_unique<ErrT>(std::forward<ArgTs>(Args)...)); | |||
332 | } | |||
333 | ||||
334 | /// Base class for user error types. Users should declare their error types | |||
335 | /// like: | |||
336 | /// | |||
337 | /// class MyError : public ErrorInfo<MyError> { | |||
338 | /// .... | |||
339 | /// }; | |||
340 | /// | |||
341 | /// This class provides an implementation of the ErrorInfoBase::kind | |||
342 | /// method, which is used by the Error RTTI system. | |||
343 | template <typename ThisErrT, typename ParentErrT = ErrorInfoBase> | |||
344 | class ErrorInfo : public ParentErrT { | |||
345 | public: | |||
346 | using ParentErrT::ParentErrT; // inherit constructors | |||
347 | ||||
348 | static const void *classID() { return &ThisErrT::ID; } | |||
349 | ||||
350 | const void *dynamicClassID() const override { return &ThisErrT::ID; } | |||
351 | ||||
352 | bool isA(const void *const ClassID) const override { | |||
353 | return ClassID == classID() || ParentErrT::isA(ClassID); | |||
354 | } | |||
355 | }; | |||
356 | ||||
357 | /// Special ErrorInfo subclass representing a list of ErrorInfos. | |||
358 | /// Instances of this class are constructed by joinError. | |||
359 | class ErrorList final : public ErrorInfo<ErrorList> { | |||
360 | // handleErrors needs to be able to iterate the payload list of an | |||
361 | // ErrorList. | |||
362 | template <typename... HandlerTs> | |||
363 | friend Error handleErrors(Error E, HandlerTs &&... Handlers); | |||
364 | ||||
365 | // joinErrors is implemented in terms of join. | |||
366 | friend Error joinErrors(Error, Error); | |||
367 | ||||
368 | public: | |||
369 | void log(raw_ostream &OS) const override { | |||
370 | OS << "Multiple errors:\n"; | |||
371 | for (auto &ErrPayload : Payloads) { | |||
372 | ErrPayload->log(OS); | |||
373 | OS << "\n"; | |||
374 | } | |||
375 | } | |||
376 | ||||
377 | std::error_code convertToErrorCode() const override; | |||
378 | ||||
379 | // Used by ErrorInfo::classID. | |||
380 | static char ID; | |||
381 | ||||
382 | private: | |||
383 | ErrorList(std::unique_ptr<ErrorInfoBase> Payload1, | |||
384 | std::unique_ptr<ErrorInfoBase> Payload2) { | |||
385 | 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-9~svn362543/include/llvm/Support/Error.h" , 386, __PRETTY_FUNCTION__)) | |||
386 | "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-9~svn362543/include/llvm/Support/Error.h" , 386, __PRETTY_FUNCTION__)); | |||
387 | Payloads.push_back(std::move(Payload1)); | |||
388 | Payloads.push_back(std::move(Payload2)); | |||
389 | } | |||
390 | ||||
391 | static Error join(Error E1, Error E2) { | |||
392 | if (!E1) | |||
393 | return E2; | |||
394 | if (!E2) | |||
395 | return E1; | |||
396 | if (E1.isA<ErrorList>()) { | |||
397 | auto &E1List = static_cast<ErrorList &>(*E1.getPtr()); | |||
398 | if (E2.isA<ErrorList>()) { | |||
399 | auto E2Payload = E2.takePayload(); | |||
400 | auto &E2List = static_cast<ErrorList &>(*E2Payload); | |||
401 | for (auto &Payload : E2List.Payloads) | |||
402 | E1List.Payloads.push_back(std::move(Payload)); | |||
403 | } else | |||
404 | E1List.Payloads.push_back(E2.takePayload()); | |||
405 | ||||
406 | return E1; | |||
407 | } | |||
408 | if (E2.isA<ErrorList>()) { | |||
409 | auto &E2List = static_cast<ErrorList &>(*E2.getPtr()); | |||
410 | E2List.Payloads.insert(E2List.Payloads.begin(), E1.takePayload()); | |||
411 | return E2; | |||
412 | } | |||
413 | return Error(std::unique_ptr<ErrorList>( | |||
414 | new ErrorList(E1.takePayload(), E2.takePayload()))); | |||
415 | } | |||
416 | ||||
417 | std::vector<std::unique_ptr<ErrorInfoBase>> Payloads; | |||
418 | }; | |||
419 | ||||
420 | /// Concatenate errors. The resulting Error is unchecked, and contains the | |||
421 | /// ErrorInfo(s), if any, contained in E1, followed by the | |||
422 | /// ErrorInfo(s), if any, contained in E2. | |||
423 | inline Error joinErrors(Error E1, Error E2) { | |||
424 | return ErrorList::join(std::move(E1), std::move(E2)); | |||
425 | } | |||
426 | ||||
427 | /// Tagged union holding either a T or a Error. | |||
428 | /// | |||
429 | /// This class parallels ErrorOr, but replaces error_code with Error. Since | |||
430 | /// Error cannot be copied, this class replaces getError() with | |||
431 | /// takeError(). It also adds an bool errorIsA<ErrT>() method for testing the | |||
432 | /// error class type. | |||
433 | template <class T> class LLVM_NODISCARD[[clang::warn_unused_result]] Expected { | |||
434 | template <class T1> friend class ExpectedAsOutParameter; | |||
435 | template <class OtherT> friend class Expected; | |||
436 | ||||
437 | static const bool isRef = std::is_reference<T>::value; | |||
438 | ||||
439 | using wrap = std::reference_wrapper<typename std::remove_reference<T>::type>; | |||
440 | ||||
441 | using error_type = std::unique_ptr<ErrorInfoBase>; | |||
442 | ||||
443 | public: | |||
444 | using storage_type = typename std::conditional<isRef, wrap, T>::type; | |||
445 | using value_type = T; | |||
446 | ||||
447 | private: | |||
448 | using reference = typename std::remove_reference<T>::type &; | |||
449 | using const_reference = const typename std::remove_reference<T>::type &; | |||
450 | using pointer = typename std::remove_reference<T>::type *; | |||
451 | using const_pointer = const typename std::remove_reference<T>::type *; | |||
452 | ||||
453 | public: | |||
454 | /// Create an Expected<T> error value from the given Error. | |||
455 | Expected(Error Err) | |||
456 | : HasError(true) | |||
457 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
458 | // Expected is unchecked upon construction in Debug builds. | |||
459 | , Unchecked(true) | |||
460 | #endif | |||
461 | { | |||
462 | 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-9~svn362543/include/llvm/Support/Error.h" , 462, __PRETTY_FUNCTION__)); | |||
463 | new (getErrorStorage()) error_type(Err.takePayload()); | |||
464 | } | |||
465 | ||||
466 | /// Forbid to convert from Error::success() implicitly, this avoids having | |||
467 | /// Expected<T> foo() { return Error::success(); } which compiles otherwise | |||
468 | /// but triggers the assertion above. | |||
469 | Expected(ErrorSuccess) = delete; | |||
470 | ||||
471 | /// Create an Expected<T> success value from the given OtherT value, which | |||
472 | /// must be convertible to T. | |||
473 | template <typename OtherT> | |||
474 | Expected(OtherT &&Val, | |||
475 | typename std::enable_if<std::is_convertible<OtherT, T>::value>::type | |||
476 | * = nullptr) | |||
477 | : HasError(false) | |||
478 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
479 | // Expected is unchecked upon construction in Debug builds. | |||
480 | , Unchecked(true) | |||
481 | #endif | |||
482 | { | |||
483 | new (getStorage()) storage_type(std::forward<OtherT>(Val)); | |||
484 | } | |||
485 | ||||
486 | /// Move construct an Expected<T> value. | |||
487 | Expected(Expected &&Other) { moveConstruct(std::move(Other)); } | |||
488 | ||||
489 | /// Move construct an Expected<T> value from an Expected<OtherT>, where OtherT | |||
490 | /// must be convertible to T. | |||
491 | template <class OtherT> | |||
492 | Expected(Expected<OtherT> &&Other, | |||
493 | typename std::enable_if<std::is_convertible<OtherT, T>::value>::type | |||
494 | * = nullptr) { | |||
495 | moveConstruct(std::move(Other)); | |||
496 | } | |||
497 | ||||
498 | /// Move construct an Expected<T> value from an Expected<OtherT>, where OtherT | |||
499 | /// isn't convertible to T. | |||
500 | template <class OtherT> | |||
501 | explicit Expected( | |||
502 | Expected<OtherT> &&Other, | |||
503 | typename std::enable_if<!std::is_convertible<OtherT, T>::value>::type * = | |||
504 | nullptr) { | |||
505 | moveConstruct(std::move(Other)); | |||
506 | } | |||
507 | ||||
508 | /// Move-assign from another Expected<T>. | |||
509 | Expected &operator=(Expected &&Other) { | |||
510 | moveAssign(std::move(Other)); | |||
511 | return *this; | |||
512 | } | |||
513 | ||||
514 | /// Destroy an Expected<T>. | |||
515 | ~Expected() { | |||
516 | assertIsChecked(); | |||
517 | if (!HasError) | |||
518 | getStorage()->~storage_type(); | |||
519 | else | |||
520 | getErrorStorage()->~error_type(); | |||
521 | } | |||
522 | ||||
523 | /// Return false if there is an error. | |||
524 | explicit operator bool() { | |||
525 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
526 | Unchecked = HasError; | |||
527 | #endif | |||
528 | return !HasError; | |||
529 | } | |||
530 | ||||
531 | /// Returns a reference to the stored T value. | |||
532 | reference get() { | |||
533 | assertIsChecked(); | |||
534 | return *getStorage(); | |||
535 | } | |||
536 | ||||
537 | /// Returns a const reference to the stored T value. | |||
538 | const_reference get() const { | |||
539 | assertIsChecked(); | |||
540 | return const_cast<Expected<T> *>(this)->get(); | |||
541 | } | |||
542 | ||||
543 | /// Check that this Expected<T> is an error of type ErrT. | |||
544 | template <typename ErrT> bool errorIsA() const { | |||
545 | return HasError && (*getErrorStorage())->template isA<ErrT>(); | |||
546 | } | |||
547 | ||||
548 | /// Take ownership of the stored error. | |||
549 | /// After calling this the Expected<T> is in an indeterminate state that can | |||
550 | /// only be safely destructed. No further calls (beside the destructor) should | |||
551 | /// be made on the Expected<T> vaule. | |||
552 | Error takeError() { | |||
553 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
554 | Unchecked = false; | |||
555 | #endif | |||
556 | return HasError ? Error(std::move(*getErrorStorage())) : Error::success(); | |||
557 | } | |||
558 | ||||
559 | /// Returns a pointer to the stored T value. | |||
560 | pointer operator->() { | |||
561 | assertIsChecked(); | |||
562 | return toPointer(getStorage()); | |||
563 | } | |||
564 | ||||
565 | /// Returns a const pointer to the stored T value. | |||
566 | const_pointer operator->() const { | |||
567 | assertIsChecked(); | |||
568 | return toPointer(getStorage()); | |||
569 | } | |||
570 | ||||
571 | /// Returns a reference to the stored T value. | |||
572 | reference operator*() { | |||
573 | assertIsChecked(); | |||
574 | return *getStorage(); | |||
575 | } | |||
576 | ||||
577 | /// Returns a const reference to the stored T value. | |||
578 | const_reference operator*() const { | |||
579 | assertIsChecked(); | |||
580 | return *getStorage(); | |||
581 | } | |||
582 | ||||
583 | private: | |||
584 | template <class T1> | |||
585 | static bool compareThisIfSameType(const T1 &a, const T1 &b) { | |||
586 | return &a == &b; | |||
587 | } | |||
588 | ||||
589 | template <class T1, class T2> | |||
590 | static bool compareThisIfSameType(const T1 &a, const T2 &b) { | |||
591 | return false; | |||
592 | } | |||
593 | ||||
594 | template <class OtherT> void moveConstruct(Expected<OtherT> &&Other) { | |||
595 | HasError = Other.HasError; | |||
596 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
597 | Unchecked = true; | |||
598 | Other.Unchecked = false; | |||
599 | #endif | |||
600 | ||||
601 | if (!HasError) | |||
602 | new (getStorage()) storage_type(std::move(*Other.getStorage())); | |||
603 | else | |||
604 | new (getErrorStorage()) error_type(std::move(*Other.getErrorStorage())); | |||
605 | } | |||
606 | ||||
607 | template <class OtherT> void moveAssign(Expected<OtherT> &&Other) { | |||
608 | assertIsChecked(); | |||
609 | ||||
610 | if (compareThisIfSameType(*this, Other)) | |||
611 | return; | |||
612 | ||||
613 | this->~Expected(); | |||
614 | new (this) Expected(std::move(Other)); | |||
615 | } | |||
616 | ||||
617 | pointer toPointer(pointer Val) { return Val; } | |||
618 | ||||
619 | const_pointer toPointer(const_pointer Val) const { return Val; } | |||
620 | ||||
621 | pointer toPointer(wrap *Val) { return &Val->get(); } | |||
622 | ||||
623 | const_pointer toPointer(const wrap *Val) const { return &Val->get(); } | |||
624 | ||||
625 | storage_type *getStorage() { | |||
626 | 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-9~svn362543/include/llvm/Support/Error.h" , 626, __PRETTY_FUNCTION__)); | |||
627 | return reinterpret_cast<storage_type *>(TStorage.buffer); | |||
628 | } | |||
629 | ||||
630 | const storage_type *getStorage() const { | |||
631 | 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-9~svn362543/include/llvm/Support/Error.h" , 631, __PRETTY_FUNCTION__)); | |||
632 | return reinterpret_cast<const storage_type *>(TStorage.buffer); | |||
633 | } | |||
634 | ||||
635 | error_type *getErrorStorage() { | |||
636 | 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-9~svn362543/include/llvm/Support/Error.h" , 636, __PRETTY_FUNCTION__)); | |||
637 | return reinterpret_cast<error_type *>(ErrorStorage.buffer); | |||
638 | } | |||
639 | ||||
640 | const error_type *getErrorStorage() const { | |||
641 | 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-9~svn362543/include/llvm/Support/Error.h" , 641, __PRETTY_FUNCTION__)); | |||
642 | return reinterpret_cast<const error_type *>(ErrorStorage.buffer); | |||
643 | } | |||
644 | ||||
645 | // Used by ExpectedAsOutParameter to reset the checked flag. | |||
646 | void setUnchecked() { | |||
647 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
648 | Unchecked = true; | |||
649 | #endif | |||
650 | } | |||
651 | ||||
652 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
653 | LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn)) | |||
654 | LLVM_ATTRIBUTE_NOINLINE__attribute__((noinline)) | |||
655 | void fatalUncheckedExpected() const { | |||
656 | dbgs() << "Expected<T> must be checked before access or destruction.\n"; | |||
657 | if (HasError) { | |||
658 | dbgs() << "Unchecked Expected<T> contained error:\n"; | |||
659 | (*getErrorStorage())->log(dbgs()); | |||
660 | } else | |||
661 | dbgs() << "Expected<T> value was in success state. (Note: Expected<T> " | |||
662 | "values in success mode must still be checked prior to being " | |||
663 | "destroyed).\n"; | |||
664 | abort(); | |||
665 | } | |||
666 | #endif | |||
667 | ||||
668 | void assertIsChecked() { | |||
669 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
670 | if (LLVM_UNLIKELY(Unchecked)__builtin_expect((bool)(Unchecked), false)) | |||
671 | fatalUncheckedExpected(); | |||
672 | #endif | |||
673 | } | |||
674 | ||||
675 | union { | |||
676 | AlignedCharArrayUnion<storage_type> TStorage; | |||
677 | AlignedCharArrayUnion<error_type> ErrorStorage; | |||
678 | }; | |||
679 | bool HasError : 1; | |||
680 | #if LLVM_ENABLE_ABI_BREAKING_CHECKS1 | |||
681 | bool Unchecked : 1; | |||
682 | #endif | |||
683 | }; | |||
684 | ||||
685 | /// Report a serious error, calling any installed error handler. See | |||
686 | /// ErrorHandling.h. | |||
687 | LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn)) void report_fatal_error(Error Err, | |||
688 | bool gen_crash_diag = true); | |||
689 | ||||
690 | /// Report a fatal error if Err is a failure value. | |||
691 | /// | |||
692 | /// This function can be used to wrap calls to fallible functions ONLY when it | |||
693 | /// is known that the Error will always be a success value. E.g. | |||
694 | /// | |||
695 | /// @code{.cpp} | |||
696 | /// // foo only attempts the fallible operation if DoFallibleOperation is | |||
697 | /// // true. If DoFallibleOperation is false then foo always returns | |||
698 | /// // Error::success(). | |||
699 | /// Error foo(bool DoFallibleOperation); | |||
700 | /// | |||
701 | /// cantFail(foo(false)); | |||
702 | /// @endcode | |||
703 | inline void cantFail(Error Err, const char *Msg = nullptr) { | |||
704 | if (Err) { | |||
705 | if (!Msg) | |||
706 | Msg = "Failure value returned from cantFail wrapped call"; | |||
707 | llvm_unreachable(Msg)::llvm::llvm_unreachable_internal(Msg, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/Support/Error.h" , 707); | |||
708 | } | |||
709 | } | |||
710 | ||||
711 | /// Report a fatal error if ValOrErr is a failure value, otherwise unwraps and | |||
712 | /// returns the contained value. | |||
713 | /// | |||
714 | /// This function can be used to wrap calls to fallible functions ONLY when it | |||
715 | /// is known that the Error will always be a success value. E.g. | |||
716 | /// | |||
717 | /// @code{.cpp} | |||
718 | /// // foo only attempts the fallible operation if DoFallibleOperation is | |||
719 | /// // true. If DoFallibleOperation is false then foo always returns an int. | |||
720 | /// Expected<int> foo(bool DoFallibleOperation); | |||
721 | /// | |||
722 | /// int X = cantFail(foo(false)); | |||
723 | /// @endcode | |||
724 | template <typename T> | |||
725 | T cantFail(Expected<T> ValOrErr, const char *Msg = nullptr) { | |||
726 | if (ValOrErr) | |||
727 | return std::move(*ValOrErr); | |||
728 | else { | |||
729 | if (!Msg) | |||
730 | Msg = "Failure value returned from cantFail wrapped call"; | |||
731 | llvm_unreachable(Msg)::llvm::llvm_unreachable_internal(Msg, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/Support/Error.h" , 731); | |||
732 | } | |||
733 | } | |||
734 | ||||
735 | /// Report a fatal error if ValOrErr is a failure value, otherwise unwraps and | |||
736 | /// returns the contained reference. | |||
737 | /// | |||
738 | /// This function can be used to wrap calls to fallible functions ONLY when it | |||
739 | /// is known that the Error will always be a success value. E.g. | |||
740 | /// | |||
741 | /// @code{.cpp} | |||
742 | /// // foo only attempts the fallible operation if DoFallibleOperation is | |||
743 | /// // true. If DoFallibleOperation is false then foo always returns a Bar&. | |||
744 | /// Expected<Bar&> foo(bool DoFallibleOperation); | |||
745 | /// | |||
746 | /// Bar &X = cantFail(foo(false)); | |||
747 | /// @endcode | |||
748 | template <typename T> | |||
749 | T& cantFail(Expected<T&> ValOrErr, const char *Msg = nullptr) { | |||
750 | if (ValOrErr) | |||
751 | return *ValOrErr; | |||
752 | else { | |||
753 | if (!Msg) | |||
754 | Msg = "Failure value returned from cantFail wrapped call"; | |||
755 | llvm_unreachable(Msg)::llvm::llvm_unreachable_internal(Msg, "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/Support/Error.h" , 755); | |||
756 | } | |||
757 | } | |||
758 | ||||
759 | /// Helper for testing applicability of, and applying, handlers for | |||
760 | /// ErrorInfo types. | |||
761 | template <typename HandlerT> | |||
762 | class ErrorHandlerTraits | |||
763 | : public ErrorHandlerTraits<decltype( | |||
764 | &std::remove_reference<HandlerT>::type::operator())> {}; | |||
765 | ||||
766 | // Specialization functions of the form 'Error (const ErrT&)'. | |||
767 | template <typename ErrT> class ErrorHandlerTraits<Error (&)(ErrT &)> { | |||
768 | public: | |||
769 | static bool appliesTo(const ErrorInfoBase &E) { | |||
770 | return E.template isA<ErrT>(); | |||
771 | } | |||
772 | ||||
773 | template <typename HandlerT> | |||
774 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
775 | 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-9~svn362543/include/llvm/Support/Error.h" , 775, __PRETTY_FUNCTION__)); | |||
776 | return H(static_cast<ErrT &>(*E)); | |||
777 | } | |||
778 | }; | |||
779 | ||||
780 | // Specialization functions of the form 'void (const ErrT&)'. | |||
781 | template <typename ErrT> class ErrorHandlerTraits<void (&)(ErrT &)> { | |||
782 | public: | |||
783 | static bool appliesTo(const ErrorInfoBase &E) { | |||
784 | return E.template isA<ErrT>(); | |||
785 | } | |||
786 | ||||
787 | template <typename HandlerT> | |||
788 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
789 | 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-9~svn362543/include/llvm/Support/Error.h" , 789, __PRETTY_FUNCTION__)); | |||
790 | H(static_cast<ErrT &>(*E)); | |||
791 | return Error::success(); | |||
792 | } | |||
793 | }; | |||
794 | ||||
795 | /// Specialization for functions of the form 'Error (std::unique_ptr<ErrT>)'. | |||
796 | template <typename ErrT> | |||
797 | class ErrorHandlerTraits<Error (&)(std::unique_ptr<ErrT>)> { | |||
798 | public: | |||
799 | static bool appliesTo(const ErrorInfoBase &E) { | |||
800 | return E.template isA<ErrT>(); | |||
801 | } | |||
802 | ||||
803 | template <typename HandlerT> | |||
804 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
805 | 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-9~svn362543/include/llvm/Support/Error.h" , 805, __PRETTY_FUNCTION__)); | |||
806 | std::unique_ptr<ErrT> SubE(static_cast<ErrT *>(E.release())); | |||
807 | return H(std::move(SubE)); | |||
808 | } | |||
809 | }; | |||
810 | ||||
811 | /// Specialization for functions of the form 'void (std::unique_ptr<ErrT>)'. | |||
812 | template <typename ErrT> | |||
813 | class ErrorHandlerTraits<void (&)(std::unique_ptr<ErrT>)> { | |||
814 | public: | |||
815 | static bool appliesTo(const ErrorInfoBase &E) { | |||
816 | return E.template isA<ErrT>(); | |||
817 | } | |||
818 | ||||
819 | template <typename HandlerT> | |||
820 | static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) { | |||
821 | 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-9~svn362543/include/llvm/Support/Error.h" , 821, __PRETTY_FUNCTION__)); | |||
822 | std::unique_ptr<ErrT> SubE(static_cast<ErrT *>(E.release())); | |||
823 | H(std::move(SubE)); | |||
824 | return Error::success(); | |||
825 | } | |||
826 | }; | |||
827 | ||||
828 | // Specialization for member functions of the form 'RetT (const ErrT&)'. | |||
829 | template <typename C, typename RetT, typename ErrT> | |||
830 | class ErrorHandlerTraits<RetT (C::*)(ErrT &)> | |||
831 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
832 | ||||
833 | // Specialization for member functions of the form 'RetT (const ErrT&) const'. | |||
834 | template <typename C, typename RetT, typename ErrT> | |||
835 | class ErrorHandlerTraits<RetT (C::*)(ErrT &) const> | |||
836 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
837 | ||||
838 | // Specialization for member functions of the form 'RetT (const ErrT&)'. | |||
839 | template <typename C, typename RetT, typename ErrT> | |||
840 | class ErrorHandlerTraits<RetT (C::*)(const ErrT &)> | |||
841 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
842 | ||||
843 | // Specialization for member functions of the form 'RetT (const ErrT&) const'. | |||
844 | template <typename C, typename RetT, typename ErrT> | |||
845 | class ErrorHandlerTraits<RetT (C::*)(const ErrT &) const> | |||
846 | : public ErrorHandlerTraits<RetT (&)(ErrT &)> {}; | |||
847 | ||||
848 | /// Specialization for member functions of the form | |||
849 | /// 'RetT (std::unique_ptr<ErrT>)'. | |||
850 | template <typename C, typename RetT, typename ErrT> | |||
851 | class ErrorHandlerTraits<RetT (C::*)(std::unique_ptr<ErrT>)> | |||
852 | : public ErrorHandlerTraits<RetT (&)(std::unique_ptr<ErrT>)> {}; | |||
853 | ||||
854 | /// Specialization for member functions of the form | |||
855 | /// 'RetT (std::unique_ptr<ErrT>) const'. | |||
856 | template <typename C, typename RetT, typename ErrT> | |||
857 | class ErrorHandlerTraits<RetT (C::*)(std::unique_ptr<ErrT>) const> | |||
858 | : public ErrorHandlerTraits<RetT (&)(std::unique_ptr<ErrT>)> {}; | |||
859 | ||||
860 | inline Error handleErrorImpl(std::unique_ptr<ErrorInfoBase> Payload) { | |||
861 | return Error(std::move(Payload)); | |||
862 | } | |||
863 | ||||
864 | template <typename HandlerT, typename... HandlerTs> | |||
865 | Error handleErrorImpl(std::unique_ptr<ErrorInfoBase> Payload, | |||
866 | HandlerT &&Handler, HandlerTs &&... Handlers) { | |||
867 | if (ErrorHandlerTraits<HandlerT>::appliesTo(*Payload)) | |||
868 | return ErrorHandlerTraits<HandlerT>::apply(std::forward<HandlerT>(Handler), | |||
869 | std::move(Payload)); | |||
870 | return handleErrorImpl(std::move(Payload), | |||
871 | std::forward<HandlerTs>(Handlers)...); | |||
872 | } | |||
873 | ||||
874 | /// Pass the ErrorInfo(s) contained in E to their respective handlers. Any | |||
875 | /// unhandled errors (or Errors returned by handlers) are re-concatenated and | |||
876 | /// returned. | |||
877 | /// Because this function returns an error, its result must also be checked | |||
878 | /// or returned. If you intend to handle all errors use handleAllErrors | |||
879 | /// (which returns void, and will abort() on unhandled errors) instead. | |||
880 | template <typename... HandlerTs> | |||
881 | Error handleErrors(Error E, HandlerTs &&... Hs) { | |||
882 | if (!E) | |||
883 | return Error::success(); | |||
884 | ||||
885 | std::unique_ptr<ErrorInfoBase> Payload = E.takePayload(); | |||
886 | ||||
887 | if (Payload->isA<ErrorList>()) { | |||
888 | ErrorList &List = static_cast<ErrorList &>(*Payload); | |||
889 | Error R; | |||
890 | for (auto &P : List.Payloads) | |||
891 | R = ErrorList::join( | |||
892 | std::move(R), | |||
893 | handleErrorImpl(std::move(P), std::forward<HandlerTs>(Hs)...)); | |||
894 | return R; | |||
895 | } | |||
896 | ||||
897 | return handleErrorImpl(std::move(Payload), std::forward<HandlerTs>(Hs)...); | |||
898 | } | |||
899 | ||||
900 | /// Behaves the same as handleErrors, except that by contract all errors | |||
901 | /// *must* be handled by the given handlers (i.e. there must be no remaining | |||
902 | /// errors after running the handlers, or llvm_unreachable is called). | |||
903 | template <typename... HandlerTs> | |||
904 | void handleAllErrors(Error E, HandlerTs &&... Handlers) { | |||
905 | cantFail(handleErrors(std::move(E), std::forward<HandlerTs>(Handlers)...)); | |||
906 | } | |||
907 | ||||
908 | /// Check that E is a non-error, then drop it. | |||
909 | /// If E is an error, llvm_unreachable will be called. | |||
910 | inline void handleAllErrors(Error E) { | |||
911 | cantFail(std::move(E)); | |||
912 | } | |||
913 | ||||
914 | /// Handle any errors (if present) in an Expected<T>, then try a recovery path. | |||
915 | /// | |||
916 | /// If the incoming value is a success value it is returned unmodified. If it | |||
917 | /// is a failure value then it the contained error is passed to handleErrors. | |||
918 | /// If handleErrors is able to handle the error then the RecoveryPath functor | |||
919 | /// is called to supply the final result. If handleErrors is not able to | |||
920 | /// handle all errors then the unhandled errors are returned. | |||
921 | /// | |||
922 | /// This utility enables the follow pattern: | |||
923 | /// | |||
924 | /// @code{.cpp} | |||
925 | /// enum FooStrategy { Aggressive, Conservative }; | |||
926 | /// Expected<Foo> foo(FooStrategy S); | |||
927 | /// | |||
928 | /// auto ResultOrErr = | |||
929 | /// handleExpected( | |||
930 | /// foo(Aggressive), | |||
931 | /// []() { return foo(Conservative); }, | |||
932 | /// [](AggressiveStrategyError&) { | |||
933 | /// // Implicitly conusme this - we'll recover by using a conservative | |||
934 | /// // strategy. | |||
935 | /// }); | |||
936 | /// | |||
937 | /// @endcode | |||
938 | template <typename T, typename RecoveryFtor, typename... HandlerTs> | |||
939 | Expected<T> handleExpected(Expected<T> ValOrErr, RecoveryFtor &&RecoveryPath, | |||
940 | HandlerTs &&... Handlers) { | |||
941 | if (ValOrErr) | |||
942 | return ValOrErr; | |||
943 | ||||
944 | if (auto Err = handleErrors(ValOrErr.takeError(), | |||
945 | std::forward<HandlerTs>(Handlers)...)) | |||
946 | return std::move(Err); | |||
947 | ||||
948 | return RecoveryPath(); | |||
949 | } | |||
950 | ||||
951 | /// Log all errors (if any) in E to OS. If there are any errors, ErrorBanner | |||
952 | /// will be printed before the first one is logged. A newline will be printed | |||
953 | /// after each error. | |||
954 | /// | |||
955 | /// This function is compatible with the helpers from Support/WithColor.h. You | |||
956 | /// can pass any of them as the OS. Please consider using them instead of | |||
957 | /// including 'error: ' in the ErrorBanner. | |||
958 | /// | |||
959 | /// This is useful in the base level of your program to allow clean termination | |||
960 | /// (allowing clean deallocation of resources, etc.), while reporting error | |||
961 | /// information to the user. | |||
962 | void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner = {}); | |||
963 | ||||
964 | /// Write all error messages (if any) in E to a string. The newline character | |||
965 | /// is used to separate error messages. | |||
966 | inline std::string toString(Error E) { | |||
967 | SmallVector<std::string, 2> Errors; | |||
968 | handleAllErrors(std::move(E), [&Errors](const ErrorInfoBase &EI) { | |||
969 | Errors.push_back(EI.message()); | |||
970 | }); | |||
971 | return join(Errors.begin(), Errors.end(), "\n"); | |||
972 | } | |||
973 | ||||
974 | /// Consume a Error without doing anything. This method should be used | |||
975 | /// only where an error can be considered a reasonable and expected return | |||
976 | /// value. | |||
977 | /// | |||
978 | /// Uses of this method are potentially indicative of design problems: If it's | |||
979 | /// legitimate to do nothing while processing an "error", the error-producer | |||
980 | /// might be more clearly refactored to return an Optional<T>. | |||
981 | inline void consumeError(Error Err) { | |||
982 | handleAllErrors(std::move(Err), [](const ErrorInfoBase &) {}); | |||
983 | } | |||
984 | ||||
985 | /// Helper for converting an Error to a bool. | |||
986 | /// | |||
987 | /// This method returns true if Err is in an error state, or false if it is | |||
988 | /// in a success state. Puts Err in a checked state in both cases (unlike | |||
989 | /// Error::operator bool(), which only does this for success states). | |||
990 | inline bool errorToBool(Error Err) { | |||
991 | bool IsError = static_cast<bool>(Err); | |||
992 | if (IsError) | |||
993 | consumeError(std::move(Err)); | |||
994 | return IsError; | |||
995 | } | |||
996 | ||||
997 | /// Helper for Errors used as out-parameters. | |||
998 | /// | |||
999 | /// This helper is for use with the Error-as-out-parameter idiom, where an error | |||
1000 | /// is passed to a function or method by reference, rather than being returned. | |||
1001 | /// In such cases it is helpful to set the checked bit on entry to the function | |||
1002 | /// so that the error can be written to (unchecked Errors abort on assignment) | |||
1003 | /// and clear the checked bit on exit so that clients cannot accidentally forget | |||
1004 | /// to check the result. This helper performs these actions automatically using | |||
1005 | /// RAII: | |||
1006 | /// | |||
1007 | /// @code{.cpp} | |||
1008 | /// Result foo(Error &Err) { | |||
1009 | /// ErrorAsOutParameter ErrAsOutParam(&Err); // 'Checked' flag set | |||
1010 | /// // <body of foo> | |||
1011 | /// // <- 'Checked' flag auto-cleared when ErrAsOutParam is destructed. | |||
1012 | /// } | |||
1013 | /// @endcode | |||
1014 | /// | |||
1015 | /// ErrorAsOutParameter takes an Error* rather than Error& so that it can be | |||
1016 | /// used with optional Errors (Error pointers that are allowed to be null). If | |||
1017 | /// ErrorAsOutParameter took an Error reference, an instance would have to be | |||
1018 | /// created inside every condition that verified that Error was non-null. By | |||
1019 | /// taking an Error pointer we can just create one instance at the top of the | |||
1020 | /// function. | |||
1021 | class ErrorAsOutParameter { | |||
1022 | public: | |||
1023 | ErrorAsOutParameter(Error *Err) : Err(Err) { | |||
1024 | // Raise the checked bit if Err is success. | |||
1025 | if (Err) | |||
1026 | (void)!!*Err; | |||
1027 | } | |||
1028 | ||||
1029 | ~ErrorAsOutParameter() { | |||
1030 | // Clear the checked bit. | |||
1031 | if (Err && !*Err) | |||
1032 | *Err = Error::success(); | |||
1033 | } | |||
1034 | ||||
1035 | private: | |||
1036 | Error *Err; | |||
1037 | }; | |||
1038 | ||||
1039 | /// Helper for Expected<T>s used as out-parameters. | |||
1040 | /// | |||
1041 | /// See ErrorAsOutParameter. | |||
1042 | template <typename T> | |||
1043 | class ExpectedAsOutParameter { | |||
1044 | public: | |||
1045 | ExpectedAsOutParameter(Expected<T> *ValOrErr) | |||
1046 | : ValOrErr(ValOrErr) { | |||
1047 | if (ValOrErr) | |||
1048 | (void)!!*ValOrErr; | |||
1049 | } | |||
1050 | ||||
1051 | ~ExpectedAsOutParameter() { | |||
1052 | if (ValOrErr) | |||
1053 | ValOrErr->setUnchecked(); | |||
1054 | } | |||
1055 | ||||
1056 | private: | |||
1057 | Expected<T> *ValOrErr; | |||
1058 | }; | |||
1059 | ||||
1060 | /// This class wraps a std::error_code in a Error. | |||
1061 | /// | |||
1062 | /// This is useful if you're writing an interface that returns a Error | |||
1063 | /// (or Expected) and you want to call code that still returns | |||
1064 | /// std::error_codes. | |||
1065 | class ECError : public ErrorInfo<ECError> { | |||
1066 | friend Error errorCodeToError(std::error_code); | |||
1067 | ||||
1068 | virtual void anchor() override; | |||
1069 | ||||
1070 | public: | |||
1071 | void setErrorCode(std::error_code EC) { this->EC = EC; } | |||
1072 | std::error_code convertToErrorCode() const override { return EC; } | |||
1073 | void log(raw_ostream &OS) const override { OS << EC.message(); } | |||
1074 | ||||
1075 | // Used by ErrorInfo::classID. | |||
1076 | static char ID; | |||
1077 | ||||
1078 | protected: | |||
1079 | ECError() = default; | |||
1080 | ECError(std::error_code EC) : EC(EC) {} | |||
1081 | ||||
1082 | std::error_code EC; | |||
1083 | }; | |||
1084 | ||||
1085 | /// The value returned by this function can be returned from convertToErrorCode | |||
1086 | /// for Error values where no sensible translation to std::error_code exists. | |||
1087 | /// It should only be used in this situation, and should never be used where a | |||
1088 | /// sensible conversion to std::error_code is available, as attempts to convert | |||
1089 | /// to/from this error will result in a fatal error. (i.e. it is a programmatic | |||
1090 | ///error to try to convert such a value). | |||
1091 | std::error_code inconvertibleErrorCode(); | |||
1092 | ||||
1093 | /// Helper for converting an std::error_code to a Error. | |||
1094 | Error errorCodeToError(std::error_code EC); | |||
1095 | ||||
1096 | /// Helper for converting an ECError to a std::error_code. | |||
1097 | /// | |||
1098 | /// This method requires that Err be Error() or an ECError, otherwise it | |||
1099 | /// will trigger a call to abort(). | |||
1100 | std::error_code errorToErrorCode(Error Err); | |||
1101 | ||||
1102 | /// Convert an ErrorOr<T> to an Expected<T>. | |||
1103 | template <typename T> Expected<T> errorOrToExpected(ErrorOr<T> &&EO) { | |||
1104 | if (auto EC = EO.getError()) | |||
1105 | return errorCodeToError(EC); | |||
1106 | return std::move(*EO); | |||
1107 | } | |||
1108 | ||||
1109 | /// Convert an Expected<T> to an ErrorOr<T>. | |||
1110 | template <typename T> ErrorOr<T> expectedToErrorOr(Expected<T> &&E) { | |||
1111 | if (auto Err = E.takeError()) | |||
1112 | return errorToErrorCode(std::move(Err)); | |||
1113 | return std::move(*E); | |||
1114 | } | |||
1115 | ||||
1116 | /// This class wraps a string in an Error. | |||
1117 | /// | |||
1118 | /// StringError is useful in cases where the client is not expected to be able | |||
1119 | /// to consume the specific error message programmatically (for example, if the | |||
1120 | /// error message is to be presented to the user). | |||
1121 | /// | |||
1122 | /// StringError can also be used when additional information is to be printed | |||
1123 | /// along with a error_code message. Depending on the constructor called, this | |||
1124 | /// class can either display: | |||
1125 | /// 1. the error_code message (ECError behavior) | |||
1126 | /// 2. a string | |||
1127 | /// 3. the error_code message and a string | |||
1128 | /// | |||
1129 | /// These behaviors are useful when subtyping is required; for example, when a | |||
1130 | /// specific library needs an explicit error type. In the example below, | |||
1131 | /// PDBError is derived from StringError: | |||
1132 | /// | |||
1133 | /// @code{.cpp} | |||
1134 | /// Expected<int> foo() { | |||
1135 | /// return llvm::make_error<PDBError>(pdb_error_code::dia_failed_loading, | |||
1136 | /// "Additional information"); | |||
1137 | /// } | |||
1138 | /// @endcode | |||
1139 | /// | |||
1140 | class StringError : public ErrorInfo<StringError> { | |||
1141 | public: | |||
1142 | static char ID; | |||
1143 | ||||
1144 | // Prints EC + S and converts to EC | |||
1145 | StringError(std::error_code EC, const Twine &S = Twine()); | |||
1146 | ||||
1147 | // Prints S and converts to EC | |||
1148 | StringError(const Twine &S, std::error_code EC); | |||
1149 | ||||
1150 | void log(raw_ostream &OS) const override; | |||
1151 | std::error_code convertToErrorCode() const override; | |||
1152 | ||||
1153 | const std::string &getMessage() const { return Msg; } | |||
1154 | ||||
1155 | private: | |||
1156 | std::string Msg; | |||
1157 | std::error_code EC; | |||
1158 | const bool PrintMsgOnly = false; | |||
1159 | }; | |||
1160 | ||||
1161 | /// Create formatted StringError object. | |||
1162 | template <typename... Ts> | |||
1163 | Error createStringError(std::error_code EC, char const *Fmt, | |||
1164 | const Ts &... Vals) { | |||
1165 | std::string Buffer; | |||
1166 | raw_string_ostream Stream(Buffer); | |||
1167 | Stream << format(Fmt, Vals...); | |||
1168 | return make_error<StringError>(Stream.str(), EC); | |||
1169 | } | |||
1170 | ||||
1171 | Error createStringError(std::error_code EC, char const *Msg); | |||
1172 | ||||
1173 | /// This class wraps a filename and another Error. | |||
1174 | /// | |||
1175 | /// In some cases, an error needs to live along a 'source' name, in order to | |||
1176 | /// show more detailed information to the user. | |||
1177 | class FileError final : public ErrorInfo<FileError> { | |||
1178 | ||||
1179 | friend Error createFileError(const Twine &, Error); | |||
1180 | friend Error createFileError(const Twine &, size_t, Error); | |||
1181 | ||||
1182 | public: | |||
1183 | void log(raw_ostream &OS) const override { | |||
1184 | 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-9~svn362543/include/llvm/Support/Error.h" , 1184, __PRETTY_FUNCTION__)); | |||
1185 | OS << "'" << FileName << "': "; | |||
1186 | if (Line.hasValue()) | |||
1187 | OS << "line " << Line.getValue() << ": "; | |||
1188 | Err->log(OS); | |||
1189 | } | |||
1190 | ||||
1191 | Error takeError() { return Error(std::move(Err)); } | |||
1192 | ||||
1193 | std::error_code convertToErrorCode() const override; | |||
1194 | ||||
1195 | // Used by ErrorInfo::classID. | |||
1196 | static char ID; | |||
1197 | ||||
1198 | private: | |||
1199 | FileError(const Twine &F, Optional<size_t> LineNum, | |||
1200 | std::unique_ptr<ErrorInfoBase> E) { | |||
1201 | 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-9~svn362543/include/llvm/Support/Error.h" , 1201, __PRETTY_FUNCTION__)); | |||
1202 | assert(!F.isTriviallyEmpty() &&((!F.isTriviallyEmpty() && "The file name provided to FileError must not be empty." ) ? static_cast<void> (0) : __assert_fail ("!F.isTriviallyEmpty() && \"The file name provided to FileError must not be empty.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/Support/Error.h" , 1203, __PRETTY_FUNCTION__)) | |||
1203 | "The file name provided to FileError must not be empty.")((!F.isTriviallyEmpty() && "The file name provided to FileError must not be empty." ) ? static_cast<void> (0) : __assert_fail ("!F.isTriviallyEmpty() && \"The file name provided to FileError must not be empty.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/include/llvm/Support/Error.h" , 1203, __PRETTY_FUNCTION__)); | |||
1204 | FileName = F.str(); | |||
1205 | Err = std::move(E); | |||
1206 | Line = std::move(LineNum); | |||
1207 | } | |||
1208 | ||||
1209 | static Error build(const Twine &F, Optional<size_t> Line, Error E) { | |||
1210 | return Error( | |||
1211 | std::unique_ptr<FileError>(new FileError(F, Line, E.takePayload()))); | |||
1212 | } | |||
1213 | ||||
1214 | std::string FileName; | |||
1215 | Optional<size_t> Line; | |||
1216 | std::unique_ptr<ErrorInfoBase> Err; | |||
1217 | }; | |||
1218 | ||||
1219 | /// Concatenate a source file path and/or name with an Error. The resulting | |||
1220 | /// Error is unchecked. | |||
1221 | inline Error createFileError(const Twine &F, Error E) { | |||
1222 | return FileError::build(F, Optional<size_t>(), std::move(E)); | |||
1223 | } | |||
1224 | ||||
1225 | /// Concatenate a source file path and/or name with line number and an Error. | |||
1226 | /// The resulting Error is unchecked. | |||
1227 | inline Error createFileError(const Twine &F, size_t Line, Error E) { | |||
1228 | return FileError::build(F, Optional<size_t>(Line), std::move(E)); | |||
1229 | } | |||
1230 | ||||
1231 | /// Concatenate a source file path and/or name with a std::error_code | |||
1232 | /// to form an Error object. | |||
1233 | inline Error createFileError(const Twine &F, std::error_code EC) { | |||
1234 | return createFileError(F, errorCodeToError(EC)); | |||
1235 | } | |||
1236 | ||||
1237 | /// Concatenate a source file path and/or name with line number and | |||
1238 | /// std::error_code to form an Error object. | |||
1239 | inline Error createFileError(const Twine &F, size_t Line, std::error_code EC) { | |||
1240 | return createFileError(F, Line, errorCodeToError(EC)); | |||
1241 | } | |||
1242 | ||||
1243 | Error createFileError(const Twine &F, ErrorSuccess) = delete; | |||
1244 | ||||
1245 | /// Helper for check-and-exit error handling. | |||
1246 | /// | |||
1247 | /// For tool use only. NOT FOR USE IN LIBRARY CODE. | |||
1248 | /// | |||
1249 | class ExitOnError { | |||
1250 | public: | |||
1251 | /// Create an error on exit helper. | |||
1252 | ExitOnError(std::string Banner = "", int DefaultErrorExitCode = 1) | |||
1253 | : Banner(std::move(Banner)), | |||
1254 | GetExitCode([=](const Error &) { return DefaultErrorExitCode; }) {} | |||
1255 | ||||
1256 | /// Set the banner string for any errors caught by operator(). | |||
1257 | void setBanner(std::string Banner) { this->Banner = std::move(Banner); } | |||
1258 | ||||
1259 | /// Set the exit-code mapper function. | |||
1260 | void setExitCodeMapper(std::function<int(const Error &)> GetExitCode) { | |||
1261 | this->GetExitCode = std::move(GetExitCode); | |||
1262 | } | |||
1263 | ||||
1264 | /// Check Err. If it's in a failure state log the error(s) and exit. | |||
1265 | void operator()(Error Err) const { checkError(std::move(Err)); } | |||
1266 | ||||
1267 | /// Check E. If it's in a success state then return the contained value. If | |||
1268 | /// it's in a failure state log the error(s) and exit. | |||
1269 | template <typename T> T operator()(Expected<T> &&E) const { | |||
1270 | checkError(E.takeError()); | |||
1271 | return std::move(*E); | |||
1272 | } | |||
1273 | ||||
1274 | /// Check E. If it's in a success state then return the contained reference. If | |||
1275 | /// it's in a failure state log the error(s) and exit. | |||
1276 | template <typename T> T& operator()(Expected<T&> &&E) const { | |||
1277 | checkError(E.takeError()); | |||
1278 | return *E; | |||
1279 | } | |||
1280 | ||||
1281 | private: | |||
1282 | void checkError(Error Err) const { | |||
1283 | if (Err) { | |||
1284 | int ExitCode = GetExitCode(Err); | |||
1285 | logAllUnhandledErrors(std::move(Err), errs(), Banner); | |||
1286 | exit(ExitCode); | |||
1287 | } | |||
1288 | } | |||
1289 | ||||
1290 | std::string Banner; | |||
1291 | std::function<int(const Error &)> GetExitCode; | |||
1292 | }; | |||
1293 | ||||
1294 | /// Conversion from Error to LLVMErrorRef for C error bindings. | |||
1295 | inline LLVMErrorRef wrap(Error Err) { | |||
1296 | return reinterpret_cast<LLVMErrorRef>(Err.takePayload().release()); | |||
1297 | } | |||
1298 | ||||
1299 | /// Conversion from LLVMErrorRef to Error for C error bindings. | |||
1300 | inline Error unwrap(LLVMErrorRef ErrRef) { | |||
1301 | return Error(std::unique_ptr<ErrorInfoBase>( | |||
1302 | reinterpret_cast<ErrorInfoBase *>(ErrRef))); | |||
1303 | } | |||
1304 | ||||
1305 | } // end namespace llvm | |||
1306 | ||||
1307 | #endif // LLVM_SUPPORT_ERROR_H |