File: | include/llvm/Support/Error.h |
Warning: | line 201, column 5 Potential leak of memory pointed to by 'Payload._M_t._M_head_impl' |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | #include "llvm/ExecutionEngine/Orc/OrcABISupport.h" | |||
2 | #include "llvm/ExecutionEngine/Orc/OrcRemoteTargetServer.h" | |||
3 | #include "llvm/Support/Debug.h" | |||
4 | #include "llvm/Support/DynamicLibrary.h" | |||
5 | #include "llvm/Support/Process.h" | |||
6 | #include <sstream> | |||
7 | ||||
8 | #include "../RemoteJITUtils.h" | |||
9 | ||||
10 | using namespace llvm; | |||
11 | using namespace llvm::orc; | |||
12 | using namespace llvm::sys; | |||
13 | ||||
14 | #ifdef __x86_64__1 | |||
15 | typedef OrcX86_64_SysV HostOrcArch; | |||
16 | #else | |||
17 | typedef OrcGenericABI HostOrcArch; | |||
18 | #endif | |||
19 | ||||
20 | ExitOnError ExitOnErr; | |||
21 | ||||
22 | int main(int argc, char *argv[]) { | |||
23 | ||||
24 | if (argc != 3) { | |||
| ||||
25 | errs() << "Usage: " << argv[0] << " <input fd> <output fd>\n"; | |||
26 | return 1; | |||
27 | } | |||
28 | ||||
29 | ExitOnErr.setBanner(std::string(argv[0]) + ":"); | |||
30 | ||||
31 | int InFD; | |||
32 | int OutFD; | |||
33 | { | |||
34 | std::istringstream InFDStream(argv[1]), OutFDStream(argv[2]); | |||
35 | InFDStream >> InFD; | |||
36 | OutFDStream >> OutFD; | |||
37 | } | |||
38 | ||||
39 | if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr)) { | |||
40 | errs() << "Error loading program symbols.\n"; | |||
41 | return 1; | |||
42 | } | |||
43 | ||||
44 | auto SymbolLookup = [](const std::string &Name) { | |||
45 | return RTDyldMemoryManager::getSymbolAddressInProcess(Name); | |||
46 | }; | |||
47 | ||||
48 | auto RegisterEHFrames = [](uint8_t *Addr, uint32_t Size) { | |||
49 | RTDyldMemoryManager::registerEHFramesInProcess(Addr, Size); | |||
50 | }; | |||
51 | ||||
52 | auto DeregisterEHFrames = [](uint8_t *Addr, uint32_t Size) { | |||
53 | RTDyldMemoryManager::deregisterEHFramesInProcess(Addr, Size); | |||
54 | }; | |||
55 | ||||
56 | FDRawChannel Channel(InFD, OutFD); | |||
57 | typedef remote::OrcRemoteTargetServer<FDRawChannel, HostOrcArch> JITServer; | |||
58 | JITServer Server(Channel, SymbolLookup, RegisterEHFrames, DeregisterEHFrames); | |||
59 | ||||
60 | while (!Server.receivedTerminate()) | |||
61 | ExitOnErr(Server.handleOne()); | |||
62 | ||||
63 | close(InFD); | |||
64 | close(OutFD); | |||
65 | ||||
66 | return 0; | |||
67 | } |
1 | //===------- RPCUTils.h - Utilities for building RPC APIs -------*- 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 | // Utilities to support construction of simple RPC APIs. |
11 | // |
12 | // The RPC utilities aim for ease of use (minimal conceptual overhead) for C++ |
13 | // programmers, high performance, low memory overhead, and efficient use of the |
14 | // communications channel. |
15 | // |
16 | //===----------------------------------------------------------------------===// |
17 | |
18 | #ifndef LLVM_EXECUTIONENGINE_ORC_RPCUTILS_H |
19 | #define LLVM_EXECUTIONENGINE_ORC_RPCUTILS_H |
20 | |
21 | #include <map> |
22 | #include <thread> |
23 | #include <vector> |
24 | |
25 | #include "llvm/ADT/STLExtras.h" |
26 | #include "llvm/ExecutionEngine/Orc/OrcError.h" |
27 | #include "llvm/ExecutionEngine/Orc/RPCSerialization.h" |
28 | #include "llvm/Support/MSVCErrorWorkarounds.h" |
29 | |
30 | #include <future> |
31 | |
32 | namespace llvm { |
33 | namespace orc { |
34 | namespace rpc { |
35 | |
36 | /// Base class of all fatal RPC errors (those that necessarily result in the |
37 | /// termination of the RPC session). |
38 | class RPCFatalError : public ErrorInfo<RPCFatalError> { |
39 | public: |
40 | static char ID; |
41 | }; |
42 | |
43 | /// RPCConnectionClosed is returned from RPC operations if the RPC connection |
44 | /// has already been closed due to either an error or graceful disconnection. |
45 | class ConnectionClosed : public ErrorInfo<ConnectionClosed> { |
46 | public: |
47 | static char ID; |
48 | std::error_code convertToErrorCode() const override; |
49 | void log(raw_ostream &OS) const override; |
50 | }; |
51 | |
52 | /// BadFunctionCall is returned from handleOne when the remote makes a call with |
53 | /// an unrecognized function id. |
54 | /// |
55 | /// This error is fatal because Orc RPC needs to know how to parse a function |
56 | /// call to know where the next call starts, and if it doesn't recognize the |
57 | /// function id it cannot parse the call. |
58 | template <typename FnIdT, typename SeqNoT> |
59 | class BadFunctionCall |
60 | : public ErrorInfo<BadFunctionCall<FnIdT, SeqNoT>, RPCFatalError> { |
61 | public: |
62 | static char ID; |
63 | |
64 | BadFunctionCall(FnIdT FnId, SeqNoT SeqNo) |
65 | : FnId(std::move(FnId)), SeqNo(std::move(SeqNo)) {} |
66 | |
67 | std::error_code convertToErrorCode() const override { |
68 | return orcError(OrcErrorCode::UnexpectedRPCCall); |
69 | } |
70 | |
71 | void log(raw_ostream &OS) const override { |
72 | OS << "Call to invalid RPC function id '" << FnId << "' with " |
73 | "sequence number " << SeqNo; |
74 | } |
75 | |
76 | private: |
77 | FnIdT FnId; |
78 | SeqNoT SeqNo; |
79 | }; |
80 | |
81 | template <typename FnIdT, typename SeqNoT> |
82 | char BadFunctionCall<FnIdT, SeqNoT>::ID = 0; |
83 | |
84 | /// InvalidSequenceNumberForResponse is returned from handleOne when a response |
85 | /// call arrives with a sequence number that doesn't correspond to any in-flight |
86 | /// function call. |
87 | /// |
88 | /// This error is fatal because Orc RPC needs to know how to parse the rest of |
89 | /// the response call to know where the next call starts, and if it doesn't have |
90 | /// a result parser for this sequence number it can't do that. |
91 | template <typename SeqNoT> |
92 | class InvalidSequenceNumberForResponse |
93 | : public ErrorInfo<InvalidSequenceNumberForResponse<SeqNoT>, RPCFatalError> { |
94 | public: |
95 | static char ID; |
96 | |
97 | InvalidSequenceNumberForResponse(SeqNoT SeqNo) |
98 | : SeqNo(std::move(SeqNo)) {} |
99 | |
100 | std::error_code convertToErrorCode() const override { |
101 | return orcError(OrcErrorCode::UnexpectedRPCCall); |
102 | }; |
103 | |
104 | void log(raw_ostream &OS) const override { |
105 | OS << "Response has unknown sequence number " << SeqNo; |
106 | } |
107 | private: |
108 | SeqNoT SeqNo; |
109 | }; |
110 | |
111 | template <typename SeqNoT> |
112 | char InvalidSequenceNumberForResponse<SeqNoT>::ID = 0; |
113 | |
114 | /// This non-fatal error will be passed to asynchronous result handlers in place |
115 | /// of a result if the connection goes down before a result returns, or if the |
116 | /// function to be called cannot be negotiated with the remote. |
117 | class ResponseAbandoned : public ErrorInfo<ResponseAbandoned> { |
118 | public: |
119 | static char ID; |
120 | |
121 | std::error_code convertToErrorCode() const override; |
122 | void log(raw_ostream &OS) const override; |
123 | }; |
124 | |
125 | /// This error is returned if the remote does not have a handler installed for |
126 | /// the given RPC function. |
127 | class CouldNotNegotiate : public ErrorInfo<CouldNotNegotiate> { |
128 | public: |
129 | static char ID; |
130 | |
131 | CouldNotNegotiate(std::string Signature); |
132 | std::error_code convertToErrorCode() const override; |
133 | void log(raw_ostream &OS) const override; |
134 | const std::string &getSignature() const { return Signature; } |
135 | private: |
136 | std::string Signature; |
137 | }; |
138 | |
139 | template <typename DerivedFunc, typename FnT> class Function; |
140 | |
141 | // RPC Function class. |
142 | // DerivedFunc should be a user defined class with a static 'getName()' method |
143 | // returning a const char* representing the function's name. |
144 | template <typename DerivedFunc, typename RetT, typename... ArgTs> |
145 | class Function<DerivedFunc, RetT(ArgTs...)> { |
146 | public: |
147 | /// User defined function type. |
148 | using Type = RetT(ArgTs...); |
149 | |
150 | /// Return type. |
151 | using ReturnType = RetT; |
152 | |
153 | /// Returns the full function prototype as a string. |
154 | static const char *getPrototype() { |
155 | std::lock_guard<std::mutex> Lock(NameMutex); |
156 | if (Name.empty()) |
157 | raw_string_ostream(Name) |
158 | << RPCTypeName<RetT>::getName() << " " << DerivedFunc::getName() |
159 | << "(" << llvm::orc::rpc::RPCTypeNameSequence<ArgTs...>() << ")"; |
160 | return Name.data(); |
161 | } |
162 | |
163 | private: |
164 | static std::mutex NameMutex; |
165 | static std::string Name; |
166 | }; |
167 | |
168 | template <typename DerivedFunc, typename RetT, typename... ArgTs> |
169 | std::mutex Function<DerivedFunc, RetT(ArgTs...)>::NameMutex; |
170 | |
171 | template <typename DerivedFunc, typename RetT, typename... ArgTs> |
172 | std::string Function<DerivedFunc, RetT(ArgTs...)>::Name; |
173 | |
174 | /// Allocates RPC function ids during autonegotiation. |
175 | /// Specializations of this class must provide four members: |
176 | /// |
177 | /// static T getInvalidId(): |
178 | /// Should return a reserved id that will be used to represent missing |
179 | /// functions during autonegotiation. |
180 | /// |
181 | /// static T getResponseId(): |
182 | /// Should return a reserved id that will be used to send function responses |
183 | /// (return values). |
184 | /// |
185 | /// static T getNegotiateId(): |
186 | /// Should return a reserved id for the negotiate function, which will be used |
187 | /// to negotiate ids for user defined functions. |
188 | /// |
189 | /// template <typename Func> T allocate(): |
190 | /// Allocate a unique id for function Func. |
191 | template <typename T, typename = void> class RPCFunctionIdAllocator; |
192 | |
193 | /// This specialization of RPCFunctionIdAllocator provides a default |
194 | /// implementation for integral types. |
195 | template <typename T> |
196 | class RPCFunctionIdAllocator< |
197 | T, typename std::enable_if<std::is_integral<T>::value>::type> { |
198 | public: |
199 | static T getInvalidId() { return T(0); } |
200 | static T getResponseId() { return T(1); } |
201 | static T getNegotiateId() { return T(2); } |
202 | |
203 | template <typename Func> T allocate() { return NextId++; } |
204 | |
205 | private: |
206 | T NextId = 3; |
207 | }; |
208 | |
209 | namespace detail { |
210 | |
211 | /// Provides a typedef for a tuple containing the decayed argument types. |
212 | template <typename T> class FunctionArgsTuple; |
213 | |
214 | template <typename RetT, typename... ArgTs> |
215 | class FunctionArgsTuple<RetT(ArgTs...)> { |
216 | public: |
217 | using Type = std::tuple<typename std::decay< |
218 | typename std::remove_reference<ArgTs>::type>::type...>; |
219 | }; |
220 | |
221 | // ResultTraits provides typedefs and utilities specific to the return type |
222 | // of functions. |
223 | template <typename RetT> class ResultTraits { |
224 | public: |
225 | // The return type wrapped in llvm::Expected. |
226 | using ErrorReturnType = Expected<RetT>; |
227 | |
228 | #ifdef _MSC_VER |
229 | // The ErrorReturnType wrapped in a std::promise. |
230 | using ReturnPromiseType = std::promise<MSVCPExpected<RetT>>; |
231 | |
232 | // The ErrorReturnType wrapped in a std::future. |
233 | using ReturnFutureType = std::future<MSVCPExpected<RetT>>; |
234 | #else |
235 | // The ErrorReturnType wrapped in a std::promise. |
236 | using ReturnPromiseType = std::promise<ErrorReturnType>; |
237 | |
238 | // The ErrorReturnType wrapped in a std::future. |
239 | using ReturnFutureType = std::future<ErrorReturnType>; |
240 | #endif |
241 | |
242 | // Create a 'blank' value of the ErrorReturnType, ready and safe to |
243 | // overwrite. |
244 | static ErrorReturnType createBlankErrorReturnValue() { |
245 | return ErrorReturnType(RetT()); |
246 | } |
247 | |
248 | // Consume an abandoned ErrorReturnType. |
249 | static void consumeAbandoned(ErrorReturnType RetOrErr) { |
250 | consumeError(RetOrErr.takeError()); |
251 | } |
252 | }; |
253 | |
254 | // ResultTraits specialization for void functions. |
255 | template <> class ResultTraits<void> { |
256 | public: |
257 | // For void functions, ErrorReturnType is llvm::Error. |
258 | using ErrorReturnType = Error; |
259 | |
260 | #ifdef _MSC_VER |
261 | // The ErrorReturnType wrapped in a std::promise. |
262 | using ReturnPromiseType = std::promise<MSVCPError>; |
263 | |
264 | // The ErrorReturnType wrapped in a std::future. |
265 | using ReturnFutureType = std::future<MSVCPError>; |
266 | #else |
267 | // The ErrorReturnType wrapped in a std::promise. |
268 | using ReturnPromiseType = std::promise<ErrorReturnType>; |
269 | |
270 | // The ErrorReturnType wrapped in a std::future. |
271 | using ReturnFutureType = std::future<ErrorReturnType>; |
272 | #endif |
273 | |
274 | // Create a 'blank' value of the ErrorReturnType, ready and safe to |
275 | // overwrite. |
276 | static ErrorReturnType createBlankErrorReturnValue() { |
277 | return ErrorReturnType::success(); |
278 | } |
279 | |
280 | // Consume an abandoned ErrorReturnType. |
281 | static void consumeAbandoned(ErrorReturnType Err) { |
282 | consumeError(std::move(Err)); |
283 | } |
284 | }; |
285 | |
286 | // ResultTraits<Error> is equivalent to ResultTraits<void>. This allows |
287 | // handlers for void RPC functions to return either void (in which case they |
288 | // implicitly succeed) or Error (in which case their error return is |
289 | // propagated). See usage in HandlerTraits::runHandlerHelper. |
290 | template <> class ResultTraits<Error> : public ResultTraits<void> {}; |
291 | |
292 | // ResultTraits<Expected<T>> is equivalent to ResultTraits<T>. This allows |
293 | // handlers for RPC functions returning a T to return either a T (in which |
294 | // case they implicitly succeed) or Expected<T> (in which case their error |
295 | // return is propagated). See usage in HandlerTraits::runHandlerHelper. |
296 | template <typename RetT> |
297 | class ResultTraits<Expected<RetT>> : public ResultTraits<RetT> {}; |
298 | |
299 | // Determines whether an RPC function's defined error return type supports |
300 | // error return value. |
301 | template <typename T> |
302 | class SupportsErrorReturn { |
303 | public: |
304 | static const bool value = false; |
305 | }; |
306 | |
307 | template <> |
308 | class SupportsErrorReturn<Error> { |
309 | public: |
310 | static const bool value = true; |
311 | }; |
312 | |
313 | template <typename T> |
314 | class SupportsErrorReturn<Expected<T>> { |
315 | public: |
316 | static const bool value = true; |
317 | }; |
318 | |
319 | // RespondHelper packages return values based on whether or not the declared |
320 | // RPC function return type supports error returns. |
321 | template <bool FuncSupportsErrorReturn> |
322 | class RespondHelper; |
323 | |
324 | // RespondHelper specialization for functions that support error returns. |
325 | template <> |
326 | class RespondHelper<true> { |
327 | public: |
328 | |
329 | // Send Expected<T>. |
330 | template <typename WireRetT, typename HandlerRetT, typename ChannelT, |
331 | typename FunctionIdT, typename SequenceNumberT> |
332 | static Error sendResult(ChannelT &C, const FunctionIdT &ResponseId, |
333 | SequenceNumberT SeqNo, |
334 | Expected<HandlerRetT> ResultOrErr) { |
335 | if (!ResultOrErr && ResultOrErr.template errorIsA<RPCFatalError>()) |
336 | return ResultOrErr.takeError(); |
337 | |
338 | // Open the response message. |
339 | if (auto Err = C.startSendMessage(ResponseId, SeqNo)) |
340 | return Err; |
341 | |
342 | // Serialize the result. |
343 | if (auto Err = |
344 | SerializationTraits<ChannelT, WireRetT, |
345 | Expected<HandlerRetT>>::serialize( |
346 | C, std::move(ResultOrErr))) |
347 | return Err; |
348 | |
349 | // Close the response message. |
350 | return C.endSendMessage(); |
351 | } |
352 | |
353 | template <typename ChannelT, typename FunctionIdT, typename SequenceNumberT> |
354 | static Error sendResult(ChannelT &C, const FunctionIdT &ResponseId, |
355 | SequenceNumberT SeqNo, Error Err) { |
356 | if (Err && Err.isA<RPCFatalError>()) |
357 | return Err; |
358 | if (auto Err2 = C.startSendMessage(ResponseId, SeqNo)) |
359 | return Err2; |
360 | if (auto Err2 = serializeSeq(C, std::move(Err))) |
361 | return Err2; |
362 | return C.endSendMessage(); |
363 | } |
364 | |
365 | }; |
366 | |
367 | // RespondHelper specialization for functions that do not support error returns. |
368 | template <> |
369 | class RespondHelper<false> { |
370 | public: |
371 | |
372 | template <typename WireRetT, typename HandlerRetT, typename ChannelT, |
373 | typename FunctionIdT, typename SequenceNumberT> |
374 | static Error sendResult(ChannelT &C, const FunctionIdT &ResponseId, |
375 | SequenceNumberT SeqNo, |
376 | Expected<HandlerRetT> ResultOrErr) { |
377 | if (auto Err = ResultOrErr.takeError()) |
378 | return Err; |
379 | |
380 | // Open the response message. |
381 | if (auto Err = C.startSendMessage(ResponseId, SeqNo)) |
382 | return Err; |
383 | |
384 | // Serialize the result. |
385 | if (auto Err = |
386 | SerializationTraits<ChannelT, WireRetT, HandlerRetT>::serialize( |
387 | C, *ResultOrErr)) |
388 | return Err; |
389 | |
390 | // Close the response message. |
391 | return C.endSendMessage(); |
392 | } |
393 | |
394 | template <typename ChannelT, typename FunctionIdT, typename SequenceNumberT> |
395 | static Error sendResult(ChannelT &C, const FunctionIdT &ResponseId, |
396 | SequenceNumberT SeqNo, Error Err) { |
397 | if (Err) |
398 | return Err; |
399 | if (auto Err2 = C.startSendMessage(ResponseId, SeqNo)) |
400 | return Err2; |
401 | return C.endSendMessage(); |
402 | } |
403 | |
404 | }; |
405 | |
406 | |
407 | // Send a response of the given wire return type (WireRetT) over the |
408 | // channel, with the given sequence number. |
409 | template <typename WireRetT, typename HandlerRetT, typename ChannelT, |
410 | typename FunctionIdT, typename SequenceNumberT> |
411 | Error respond(ChannelT &C, const FunctionIdT &ResponseId, |
412 | SequenceNumberT SeqNo, Expected<HandlerRetT> ResultOrErr) { |
413 | return RespondHelper<SupportsErrorReturn<WireRetT>::value>:: |
414 | template sendResult<WireRetT>(C, ResponseId, SeqNo, std::move(ResultOrErr)); |
415 | } |
416 | |
417 | // Send an empty response message on the given channel to indicate that |
418 | // the handler ran. |
419 | template <typename WireRetT, typename ChannelT, typename FunctionIdT, |
420 | typename SequenceNumberT> |
421 | Error respond(ChannelT &C, const FunctionIdT &ResponseId, SequenceNumberT SeqNo, |
422 | Error Err) { |
423 | return RespondHelper<SupportsErrorReturn<WireRetT>::value>:: |
424 | sendResult(C, ResponseId, SeqNo, std::move(Err)); |
425 | } |
426 | |
427 | // Converts a given type to the equivalent error return type. |
428 | template <typename T> class WrappedHandlerReturn { |
429 | public: |
430 | using Type = Expected<T>; |
431 | }; |
432 | |
433 | template <typename T> class WrappedHandlerReturn<Expected<T>> { |
434 | public: |
435 | using Type = Expected<T>; |
436 | }; |
437 | |
438 | template <> class WrappedHandlerReturn<void> { |
439 | public: |
440 | using Type = Error; |
441 | }; |
442 | |
443 | template <> class WrappedHandlerReturn<Error> { |
444 | public: |
445 | using Type = Error; |
446 | }; |
447 | |
448 | template <> class WrappedHandlerReturn<ErrorSuccess> { |
449 | public: |
450 | using Type = Error; |
451 | }; |
452 | |
453 | // Traits class that strips the response function from the list of handler |
454 | // arguments. |
455 | template <typename FnT> class AsyncHandlerTraits; |
456 | |
457 | template <typename ResultT, typename... ArgTs> |
458 | class AsyncHandlerTraits<Error(std::function<Error(Expected<ResultT>)>, ArgTs...)> { |
459 | public: |
460 | using Type = Error(ArgTs...); |
461 | using ResultType = Expected<ResultT>; |
462 | }; |
463 | |
464 | template <typename... ArgTs> |
465 | class AsyncHandlerTraits<Error(std::function<Error(Error)>, ArgTs...)> { |
466 | public: |
467 | using Type = Error(ArgTs...); |
468 | using ResultType = Error; |
469 | }; |
470 | |
471 | template <typename... ArgTs> |
472 | class AsyncHandlerTraits<ErrorSuccess(std::function<Error(Error)>, ArgTs...)> { |
473 | public: |
474 | using Type = Error(ArgTs...); |
475 | using ResultType = Error; |
476 | }; |
477 | |
478 | template <typename... ArgTs> |
479 | class AsyncHandlerTraits<void(std::function<Error(Error)>, ArgTs...)> { |
480 | public: |
481 | using Type = Error(ArgTs...); |
482 | using ResultType = Error; |
483 | }; |
484 | |
485 | template <typename ResponseHandlerT, typename... ArgTs> |
486 | class AsyncHandlerTraits<Error(ResponseHandlerT, ArgTs...)> : |
487 | public AsyncHandlerTraits<Error(typename std::decay<ResponseHandlerT>::type, |
488 | ArgTs...)> {}; |
489 | |
490 | // This template class provides utilities related to RPC function handlers. |
491 | // The base case applies to non-function types (the template class is |
492 | // specialized for function types) and inherits from the appropriate |
493 | // speciilization for the given non-function type's call operator. |
494 | template <typename HandlerT> |
495 | class HandlerTraits : public HandlerTraits<decltype( |
496 | &std::remove_reference<HandlerT>::type::operator())> { |
497 | }; |
498 | |
499 | // Traits for handlers with a given function type. |
500 | template <typename RetT, typename... ArgTs> |
501 | class HandlerTraits<RetT(ArgTs...)> { |
502 | public: |
503 | // Function type of the handler. |
504 | using Type = RetT(ArgTs...); |
505 | |
506 | // Return type of the handler. |
507 | using ReturnType = RetT; |
508 | |
509 | // Call the given handler with the given arguments. |
510 | template <typename HandlerT, typename... TArgTs> |
511 | static typename WrappedHandlerReturn<RetT>::Type |
512 | unpackAndRun(HandlerT &Handler, std::tuple<TArgTs...> &Args) { |
513 | return unpackAndRunHelper(Handler, Args, |
514 | llvm::index_sequence_for<TArgTs...>()); |
515 | } |
516 | |
517 | // Call the given handler with the given arguments. |
518 | template <typename HandlerT, typename ResponderT, typename... TArgTs> |
519 | static Error unpackAndRunAsync(HandlerT &Handler, ResponderT &Responder, |
520 | std::tuple<TArgTs...> &Args) { |
521 | return unpackAndRunAsyncHelper(Handler, Responder, Args, |
522 | llvm::index_sequence_for<TArgTs...>()); |
523 | } |
524 | |
525 | // Call the given handler with the given arguments. |
526 | template <typename HandlerT> |
527 | static typename std::enable_if< |
528 | std::is_void<typename HandlerTraits<HandlerT>::ReturnType>::value, |
529 | Error>::type |
530 | run(HandlerT &Handler, ArgTs &&... Args) { |
531 | Handler(std::move(Args)...); |
532 | return Error::success(); |
533 | } |
534 | |
535 | template <typename HandlerT, typename... TArgTs> |
536 | static typename std::enable_if< |
537 | !std::is_void<typename HandlerTraits<HandlerT>::ReturnType>::value, |
538 | typename HandlerTraits<HandlerT>::ReturnType>::type |
539 | run(HandlerT &Handler, TArgTs... Args) { |
540 | return Handler(std::move(Args)...); |
541 | } |
542 | |
543 | // Serialize arguments to the channel. |
544 | template <typename ChannelT, typename... CArgTs> |
545 | static Error serializeArgs(ChannelT &C, const CArgTs... CArgs) { |
546 | return SequenceSerialization<ChannelT, ArgTs...>::serialize(C, CArgs...); |
547 | } |
548 | |
549 | // Deserialize arguments from the channel. |
550 | template <typename ChannelT, typename... CArgTs> |
551 | static Error deserializeArgs(ChannelT &C, std::tuple<CArgTs...> &Args) { |
552 | return deserializeArgsHelper(C, Args, |
553 | llvm::index_sequence_for<CArgTs...>()); |
554 | } |
555 | |
556 | private: |
557 | template <typename ChannelT, typename... CArgTs, size_t... Indexes> |
558 | static Error deserializeArgsHelper(ChannelT &C, std::tuple<CArgTs...> &Args, |
559 | llvm::index_sequence<Indexes...> _) { |
560 | return SequenceSerialization<ChannelT, ArgTs...>::deserialize( |
561 | C, std::get<Indexes>(Args)...); |
562 | } |
563 | |
564 | template <typename HandlerT, typename ArgTuple, size_t... Indexes> |
565 | static typename WrappedHandlerReturn< |
566 | typename HandlerTraits<HandlerT>::ReturnType>::Type |
567 | unpackAndRunHelper(HandlerT &Handler, ArgTuple &Args, |
568 | llvm::index_sequence<Indexes...>) { |
569 | return run(Handler, std::move(std::get<Indexes>(Args))...); |
570 | } |
571 | |
572 | |
573 | template <typename HandlerT, typename ResponderT, typename ArgTuple, |
574 | size_t... Indexes> |
575 | static typename WrappedHandlerReturn< |
576 | typename HandlerTraits<HandlerT>::ReturnType>::Type |
577 | unpackAndRunAsyncHelper(HandlerT &Handler, ResponderT &Responder, |
578 | ArgTuple &Args, |
579 | llvm::index_sequence<Indexes...>) { |
580 | return run(Handler, Responder, std::move(std::get<Indexes>(Args))...); |
581 | } |
582 | }; |
583 | |
584 | // Handler traits for free functions. |
585 | template <typename RetT, typename... ArgTs> |
586 | class HandlerTraits<RetT(*)(ArgTs...)> |
587 | : public HandlerTraits<RetT(ArgTs...)> {}; |
588 | |
589 | // Handler traits for class methods (especially call operators for lambdas). |
590 | template <typename Class, typename RetT, typename... ArgTs> |
591 | class HandlerTraits<RetT (Class::*)(ArgTs...)> |
592 | : public HandlerTraits<RetT(ArgTs...)> {}; |
593 | |
594 | // Handler traits for const class methods (especially call operators for |
595 | // lambdas). |
596 | template <typename Class, typename RetT, typename... ArgTs> |
597 | class HandlerTraits<RetT (Class::*)(ArgTs...) const> |
598 | : public HandlerTraits<RetT(ArgTs...)> {}; |
599 | |
600 | // Utility to peel the Expected wrapper off a response handler error type. |
601 | template <typename HandlerT> class ResponseHandlerArg; |
602 | |
603 | template <typename ArgT> class ResponseHandlerArg<Error(Expected<ArgT>)> { |
604 | public: |
605 | using ArgType = Expected<ArgT>; |
606 | using UnwrappedArgType = ArgT; |
607 | }; |
608 | |
609 | template <typename ArgT> |
610 | class ResponseHandlerArg<ErrorSuccess(Expected<ArgT>)> { |
611 | public: |
612 | using ArgType = Expected<ArgT>; |
613 | using UnwrappedArgType = ArgT; |
614 | }; |
615 | |
616 | template <> class ResponseHandlerArg<Error(Error)> { |
617 | public: |
618 | using ArgType = Error; |
619 | }; |
620 | |
621 | template <> class ResponseHandlerArg<ErrorSuccess(Error)> { |
622 | public: |
623 | using ArgType = Error; |
624 | }; |
625 | |
626 | // ResponseHandler represents a handler for a not-yet-received function call |
627 | // result. |
628 | template <typename ChannelT> class ResponseHandler { |
629 | public: |
630 | virtual ~ResponseHandler() {} |
631 | |
632 | // Reads the function result off the wire and acts on it. The meaning of |
633 | // "act" will depend on how this method is implemented in any given |
634 | // ResponseHandler subclass but could, for example, mean running a |
635 | // user-specified handler or setting a promise value. |
636 | virtual Error handleResponse(ChannelT &C) = 0; |
637 | |
638 | // Abandons this outstanding result. |
639 | virtual void abandon() = 0; |
640 | |
641 | // Create an error instance representing an abandoned response. |
642 | static Error createAbandonedResponseError() { |
643 | return make_error<ResponseAbandoned>(); |
644 | } |
645 | }; |
646 | |
647 | // ResponseHandler subclass for RPC functions with non-void returns. |
648 | template <typename ChannelT, typename FuncRetT, typename HandlerT> |
649 | class ResponseHandlerImpl : public ResponseHandler<ChannelT> { |
650 | public: |
651 | ResponseHandlerImpl(HandlerT Handler) : Handler(std::move(Handler)) {} |
652 | |
653 | // Handle the result by deserializing it from the channel then passing it |
654 | // to the user defined handler. |
655 | Error handleResponse(ChannelT &C) override { |
656 | using UnwrappedArgType = typename ResponseHandlerArg< |
657 | typename HandlerTraits<HandlerT>::Type>::UnwrappedArgType; |
658 | UnwrappedArgType Result; |
659 | if (auto Err = |
660 | SerializationTraits<ChannelT, FuncRetT, |
661 | UnwrappedArgType>::deserialize(C, Result)) |
662 | return Err; |
663 | if (auto Err = C.endReceiveMessage()) |
664 | return Err; |
665 | return Handler(std::move(Result)); |
666 | } |
667 | |
668 | // Abandon this response by calling the handler with an 'abandoned response' |
669 | // error. |
670 | void abandon() override { |
671 | if (auto Err = Handler(this->createAbandonedResponseError())) { |
672 | // Handlers should not fail when passed an abandoned response error. |
673 | report_fatal_error(std::move(Err)); |
674 | } |
675 | } |
676 | |
677 | private: |
678 | HandlerT Handler; |
679 | }; |
680 | |
681 | // ResponseHandler subclass for RPC functions with void returns. |
682 | template <typename ChannelT, typename HandlerT> |
683 | class ResponseHandlerImpl<ChannelT, void, HandlerT> |
684 | : public ResponseHandler<ChannelT> { |
685 | public: |
686 | ResponseHandlerImpl(HandlerT Handler) : Handler(std::move(Handler)) {} |
687 | |
688 | // Handle the result (no actual value, just a notification that the function |
689 | // has completed on the remote end) by calling the user-defined handler with |
690 | // Error::success(). |
691 | Error handleResponse(ChannelT &C) override { |
692 | if (auto Err = C.endReceiveMessage()) |
693 | return Err; |
694 | return Handler(Error::success()); |
695 | } |
696 | |
697 | // Abandon this response by calling the handler with an 'abandoned response' |
698 | // error. |
699 | void abandon() override { |
700 | if (auto Err = Handler(this->createAbandonedResponseError())) { |
701 | // Handlers should not fail when passed an abandoned response error. |
702 | report_fatal_error(std::move(Err)); |
703 | } |
704 | } |
705 | |
706 | private: |
707 | HandlerT Handler; |
708 | }; |
709 | |
710 | template <typename ChannelT, typename FuncRetT, typename HandlerT> |
711 | class ResponseHandlerImpl<ChannelT, Expected<FuncRetT>, HandlerT> |
712 | : public ResponseHandler<ChannelT> { |
713 | public: |
714 | ResponseHandlerImpl(HandlerT Handler) : Handler(std::move(Handler)) {} |
715 | |
716 | // Handle the result by deserializing it from the channel then passing it |
717 | // to the user defined handler. |
718 | Error handleResponse(ChannelT &C) override { |
719 | using HandlerArgType = typename ResponseHandlerArg< |
720 | typename HandlerTraits<HandlerT>::Type>::ArgType; |
721 | HandlerArgType Result((typename HandlerArgType::value_type())); |
722 | |
723 | if (auto Err = |
724 | SerializationTraits<ChannelT, Expected<FuncRetT>, |
725 | HandlerArgType>::deserialize(C, Result)) |
726 | return Err; |
727 | if (auto Err = C.endReceiveMessage()) |
728 | return Err; |
729 | return Handler(std::move(Result)); |
730 | } |
731 | |
732 | // Abandon this response by calling the handler with an 'abandoned response' |
733 | // error. |
734 | void abandon() override { |
735 | if (auto Err = Handler(this->createAbandonedResponseError())) { |
736 | // Handlers should not fail when passed an abandoned response error. |
737 | report_fatal_error(std::move(Err)); |
738 | } |
739 | } |
740 | |
741 | private: |
742 | HandlerT Handler; |
743 | }; |
744 | |
745 | template <typename ChannelT, typename HandlerT> |
746 | class ResponseHandlerImpl<ChannelT, Error, HandlerT> |
747 | : public ResponseHandler<ChannelT> { |
748 | public: |
749 | ResponseHandlerImpl(HandlerT Handler) : Handler(std::move(Handler)) {} |
750 | |
751 | // Handle the result by deserializing it from the channel then passing it |
752 | // to the user defined handler. |
753 | Error handleResponse(ChannelT &C) override { |
754 | Error Result = Error::success(); |
755 | if (auto Err = |
756 | SerializationTraits<ChannelT, Error, Error>::deserialize(C, Result)) |
757 | return Err; |
758 | if (auto Err = C.endReceiveMessage()) |
759 | return Err; |
760 | return Handler(std::move(Result)); |
761 | } |
762 | |
763 | // Abandon this response by calling the handler with an 'abandoned response' |
764 | // error. |
765 | void abandon() override { |
766 | if (auto Err = Handler(this->createAbandonedResponseError())) { |
767 | // Handlers should not fail when passed an abandoned response error. |
768 | report_fatal_error(std::move(Err)); |
769 | } |
770 | } |
771 | |
772 | private: |
773 | HandlerT Handler; |
774 | }; |
775 | |
776 | // Create a ResponseHandler from a given user handler. |
777 | template <typename ChannelT, typename FuncRetT, typename HandlerT> |
778 | std::unique_ptr<ResponseHandler<ChannelT>> createResponseHandler(HandlerT H) { |
779 | return llvm::make_unique<ResponseHandlerImpl<ChannelT, FuncRetT, HandlerT>>( |
780 | std::move(H)); |
781 | } |
782 | |
783 | // Helper for wrapping member functions up as functors. This is useful for |
784 | // installing methods as result handlers. |
785 | template <typename ClassT, typename RetT, typename... ArgTs> |
786 | class MemberFnWrapper { |
787 | public: |
788 | using MethodT = RetT (ClassT::*)(ArgTs...); |
789 | MemberFnWrapper(ClassT &Instance, MethodT Method) |
790 | : Instance(Instance), Method(Method) {} |
791 | RetT operator()(ArgTs &&... Args) { |
792 | return (Instance.*Method)(std::move(Args)...); |
793 | } |
794 | |
795 | private: |
796 | ClassT &Instance; |
797 | MethodT Method; |
798 | }; |
799 | |
800 | // Helper that provides a Functor for deserializing arguments. |
801 | template <typename... ArgTs> class ReadArgs { |
802 | public: |
803 | Error operator()() { return Error::success(); } |
804 | }; |
805 | |
806 | template <typename ArgT, typename... ArgTs> |
807 | class ReadArgs<ArgT, ArgTs...> : public ReadArgs<ArgTs...> { |
808 | public: |
809 | ReadArgs(ArgT &Arg, ArgTs &... Args) |
810 | : ReadArgs<ArgTs...>(Args...), Arg(Arg) {} |
811 | |
812 | Error operator()(ArgT &ArgVal, ArgTs &... ArgVals) { |
813 | this->Arg = std::move(ArgVal); |
814 | return ReadArgs<ArgTs...>::operator()(ArgVals...); |
815 | } |
816 | |
817 | private: |
818 | ArgT &Arg; |
819 | }; |
820 | |
821 | // Manage sequence numbers. |
822 | template <typename SequenceNumberT> class SequenceNumberManager { |
823 | public: |
824 | // Reset, making all sequence numbers available. |
825 | void reset() { |
826 | std::lock_guard<std::mutex> Lock(SeqNoLock); |
827 | NextSequenceNumber = 0; |
828 | FreeSequenceNumbers.clear(); |
829 | } |
830 | |
831 | // Get the next available sequence number. Will re-use numbers that have |
832 | // been released. |
833 | SequenceNumberT getSequenceNumber() { |
834 | std::lock_guard<std::mutex> Lock(SeqNoLock); |
835 | if (FreeSequenceNumbers.empty()) |
836 | return NextSequenceNumber++; |
837 | auto SequenceNumber = FreeSequenceNumbers.back(); |
838 | FreeSequenceNumbers.pop_back(); |
839 | return SequenceNumber; |
840 | } |
841 | |
842 | // Release a sequence number, making it available for re-use. |
843 | void releaseSequenceNumber(SequenceNumberT SequenceNumber) { |
844 | std::lock_guard<std::mutex> Lock(SeqNoLock); |
845 | FreeSequenceNumbers.push_back(SequenceNumber); |
846 | } |
847 | |
848 | private: |
849 | std::mutex SeqNoLock; |
850 | SequenceNumberT NextSequenceNumber = 0; |
851 | std::vector<SequenceNumberT> FreeSequenceNumbers; |
852 | }; |
853 | |
854 | // Checks that predicate P holds for each corresponding pair of type arguments |
855 | // from T1 and T2 tuple. |
856 | template <template <class, class> class P, typename T1Tuple, typename T2Tuple> |
857 | class RPCArgTypeCheckHelper; |
858 | |
859 | template <template <class, class> class P> |
860 | class RPCArgTypeCheckHelper<P, std::tuple<>, std::tuple<>> { |
861 | public: |
862 | static const bool value = true; |
863 | }; |
864 | |
865 | template <template <class, class> class P, typename T, typename... Ts, |
866 | typename U, typename... Us> |
867 | class RPCArgTypeCheckHelper<P, std::tuple<T, Ts...>, std::tuple<U, Us...>> { |
868 | public: |
869 | static const bool value = |
870 | P<T, U>::value && |
871 | RPCArgTypeCheckHelper<P, std::tuple<Ts...>, std::tuple<Us...>>::value; |
872 | }; |
873 | |
874 | template <template <class, class> class P, typename T1Sig, typename T2Sig> |
875 | class RPCArgTypeCheck { |
876 | public: |
877 | using T1Tuple = typename FunctionArgsTuple<T1Sig>::Type; |
878 | using T2Tuple = typename FunctionArgsTuple<T2Sig>::Type; |
879 | |
880 | static_assert(std::tuple_size<T1Tuple>::value >= |
881 | std::tuple_size<T2Tuple>::value, |
882 | "Too many arguments to RPC call"); |
883 | static_assert(std::tuple_size<T1Tuple>::value <= |
884 | std::tuple_size<T2Tuple>::value, |
885 | "Too few arguments to RPC call"); |
886 | |
887 | static const bool value = RPCArgTypeCheckHelper<P, T1Tuple, T2Tuple>::value; |
888 | }; |
889 | |
890 | template <typename ChannelT, typename WireT, typename ConcreteT> |
891 | class CanSerialize { |
892 | private: |
893 | using S = SerializationTraits<ChannelT, WireT, ConcreteT>; |
894 | |
895 | template <typename T> |
896 | static std::true_type |
897 | check(typename std::enable_if< |
898 | std::is_same<decltype(T::serialize(std::declval<ChannelT &>(), |
899 | std::declval<const ConcreteT &>())), |
900 | Error>::value, |
901 | void *>::type); |
902 | |
903 | template <typename> static std::false_type check(...); |
904 | |
905 | public: |
906 | static const bool value = decltype(check<S>(0))::value; |
907 | }; |
908 | |
909 | template <typename ChannelT, typename WireT, typename ConcreteT> |
910 | class CanDeserialize { |
911 | private: |
912 | using S = SerializationTraits<ChannelT, WireT, ConcreteT>; |
913 | |
914 | template <typename T> |
915 | static std::true_type |
916 | check(typename std::enable_if< |
917 | std::is_same<decltype(T::deserialize(std::declval<ChannelT &>(), |
918 | std::declval<ConcreteT &>())), |
919 | Error>::value, |
920 | void *>::type); |
921 | |
922 | template <typename> static std::false_type check(...); |
923 | |
924 | public: |
925 | static const bool value = decltype(check<S>(0))::value; |
926 | }; |
927 | |
928 | /// Contains primitive utilities for defining, calling and handling calls to |
929 | /// remote procedures. ChannelT is a bidirectional stream conforming to the |
930 | /// RPCChannel interface (see RPCChannel.h), FunctionIdT is a procedure |
931 | /// identifier type that must be serializable on ChannelT, and SequenceNumberT |
932 | /// is an integral type that will be used to number in-flight function calls. |
933 | /// |
934 | /// These utilities support the construction of very primitive RPC utilities. |
935 | /// Their intent is to ensure correct serialization and deserialization of |
936 | /// procedure arguments, and to keep the client and server's view of the API in |
937 | /// sync. |
938 | template <typename ImplT, typename ChannelT, typename FunctionIdT, |
939 | typename SequenceNumberT> |
940 | class RPCEndpointBase { |
941 | protected: |
942 | class OrcRPCInvalid : public Function<OrcRPCInvalid, void()> { |
943 | public: |
944 | static const char *getName() { return "__orc_rpc$invalid"; } |
945 | }; |
946 | |
947 | class OrcRPCResponse : public Function<OrcRPCResponse, void()> { |
948 | public: |
949 | static const char *getName() { return "__orc_rpc$response"; } |
950 | }; |
951 | |
952 | class OrcRPCNegotiate |
953 | : public Function<OrcRPCNegotiate, FunctionIdT(std::string)> { |
954 | public: |
955 | static const char *getName() { return "__orc_rpc$negotiate"; } |
956 | }; |
957 | |
958 | // Helper predicate for testing for the presence of SerializeTraits |
959 | // serializers. |
960 | template <typename WireT, typename ConcreteT> |
961 | class CanSerializeCheck : detail::CanSerialize<ChannelT, WireT, ConcreteT> { |
962 | public: |
963 | using detail::CanSerialize<ChannelT, WireT, ConcreteT>::value; |
964 | |
965 | static_assert(value, "Missing serializer for argument (Can't serialize the " |
966 | "first template type argument of CanSerializeCheck " |
967 | "from the second)"); |
968 | }; |
969 | |
970 | // Helper predicate for testing for the presence of SerializeTraits |
971 | // deserializers. |
972 | template <typename WireT, typename ConcreteT> |
973 | class CanDeserializeCheck |
974 | : detail::CanDeserialize<ChannelT, WireT, ConcreteT> { |
975 | public: |
976 | using detail::CanDeserialize<ChannelT, WireT, ConcreteT>::value; |
977 | |
978 | static_assert(value, "Missing deserializer for argument (Can't deserialize " |
979 | "the second template type argument of " |
980 | "CanDeserializeCheck from the first)"); |
981 | }; |
982 | |
983 | public: |
984 | /// Construct an RPC instance on a channel. |
985 | RPCEndpointBase(ChannelT &C, bool LazyAutoNegotiation) |
986 | : C(C), LazyAutoNegotiation(LazyAutoNegotiation) { |
987 | // Hold ResponseId in a special variable, since we expect Response to be |
988 | // called relatively frequently, and want to avoid the map lookup. |
989 | ResponseId = FnIdAllocator.getResponseId(); |
990 | RemoteFunctionIds[OrcRPCResponse::getPrototype()] = ResponseId; |
991 | |
992 | // Register the negotiate function id and handler. |
993 | auto NegotiateId = FnIdAllocator.getNegotiateId(); |
994 | RemoteFunctionIds[OrcRPCNegotiate::getPrototype()] = NegotiateId; |
995 | Handlers[NegotiateId] = wrapHandler<OrcRPCNegotiate>( |
996 | [this](const std::string &Name) { return handleNegotiate(Name); }); |
997 | } |
998 | |
999 | |
1000 | /// Negotiate a function id for Func with the other end of the channel. |
1001 | template <typename Func> Error negotiateFunction(bool Retry = false) { |
1002 | return getRemoteFunctionId<Func>(true, Retry).takeError(); |
1003 | } |
1004 | |
1005 | /// Append a call Func, does not call send on the channel. |
1006 | /// The first argument specifies a user-defined handler to be run when the |
1007 | /// function returns. The handler should take an Expected<Func::ReturnType>, |
1008 | /// or an Error (if Func::ReturnType is void). The handler will be called |
1009 | /// with an error if the return value is abandoned due to a channel error. |
1010 | template <typename Func, typename HandlerT, typename... ArgTs> |
1011 | Error appendCallAsync(HandlerT Handler, const ArgTs &... Args) { |
1012 | |
1013 | static_assert( |
1014 | detail::RPCArgTypeCheck<CanSerializeCheck, typename Func::Type, |
1015 | void(ArgTs...)>::value, |
1016 | ""); |
1017 | |
1018 | // Look up the function ID. |
1019 | FunctionIdT FnId; |
1020 | if (auto FnIdOrErr = getRemoteFunctionId<Func>(LazyAutoNegotiation, false)) |
1021 | FnId = *FnIdOrErr; |
1022 | else { |
1023 | // Negotiation failed. Notify the handler then return the negotiate-failed |
1024 | // error. |
1025 | cantFail(Handler(make_error<ResponseAbandoned>())); |
1026 | return FnIdOrErr.takeError(); |
1027 | } |
1028 | |
1029 | SequenceNumberT SeqNo; // initialized in locked scope below. |
1030 | { |
1031 | // Lock the pending responses map and sequence number manager. |
1032 | std::lock_guard<std::mutex> Lock(ResponsesMutex); |
1033 | |
1034 | // Allocate a sequence number. |
1035 | SeqNo = SequenceNumberMgr.getSequenceNumber(); |
1036 | assert(!PendingResponses.count(SeqNo) &&((!PendingResponses.count(SeqNo) && "Sequence number already allocated" ) ? static_cast<void> (0) : __assert_fail ("!PendingResponses.count(SeqNo) && \"Sequence number already allocated\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1037, __PRETTY_FUNCTION__)) |
1037 | "Sequence number already allocated")((!PendingResponses.count(SeqNo) && "Sequence number already allocated" ) ? static_cast<void> (0) : __assert_fail ("!PendingResponses.count(SeqNo) && \"Sequence number already allocated\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1037, __PRETTY_FUNCTION__)); |
1038 | |
1039 | // Install the user handler. |
1040 | PendingResponses[SeqNo] = |
1041 | detail::createResponseHandler<ChannelT, typename Func::ReturnType>( |
1042 | std::move(Handler)); |
1043 | } |
1044 | |
1045 | // Open the function call message. |
1046 | if (auto Err = C.startSendMessage(FnId, SeqNo)) { |
1047 | abandonPendingResponses(); |
1048 | return Err; |
1049 | } |
1050 | |
1051 | // Serialize the call arguments. |
1052 | if (auto Err = detail::HandlerTraits<typename Func::Type>::serializeArgs( |
1053 | C, Args...)) { |
1054 | abandonPendingResponses(); |
1055 | return Err; |
1056 | } |
1057 | |
1058 | // Close the function call messagee. |
1059 | if (auto Err = C.endSendMessage()) { |
1060 | abandonPendingResponses(); |
1061 | return Err; |
1062 | } |
1063 | |
1064 | return Error::success(); |
1065 | } |
1066 | |
1067 | Error sendAppendedCalls() { return C.send(); }; |
1068 | |
1069 | template <typename Func, typename HandlerT, typename... ArgTs> |
1070 | Error callAsync(HandlerT Handler, const ArgTs &... Args) { |
1071 | if (auto Err = appendCallAsync<Func>(std::move(Handler), Args...)) |
1072 | return Err; |
1073 | return C.send(); |
1074 | } |
1075 | |
1076 | /// Handle one incoming call. |
1077 | Error handleOne() { |
1078 | FunctionIdT FnId; |
1079 | SequenceNumberT SeqNo; |
1080 | if (auto Err = C.startReceiveMessage(FnId, SeqNo)) { |
1081 | abandonPendingResponses(); |
1082 | return Err; |
1083 | } |
1084 | if (FnId == ResponseId) |
1085 | return handleResponse(SeqNo); |
1086 | auto I = Handlers.find(FnId); |
1087 | if (I != Handlers.end()) |
1088 | return I->second(C, SeqNo); |
1089 | |
1090 | // else: No handler found. Report error to client? |
1091 | return make_error<BadFunctionCall<FunctionIdT, SequenceNumberT>>(FnId, |
1092 | SeqNo); |
1093 | } |
1094 | |
1095 | /// Helper for handling setter procedures - this method returns a functor that |
1096 | /// sets the variables referred to by Args... to values deserialized from the |
1097 | /// channel. |
1098 | /// E.g. |
1099 | /// |
1100 | /// typedef Function<0, bool, int> Func1; |
1101 | /// |
1102 | /// ... |
1103 | /// bool B; |
1104 | /// int I; |
1105 | /// if (auto Err = expect<Func1>(Channel, readArgs(B, I))) |
1106 | /// /* Handle Args */ ; |
1107 | /// |
1108 | template <typename... ArgTs> |
1109 | static detail::ReadArgs<ArgTs...> readArgs(ArgTs &... Args) { |
1110 | return detail::ReadArgs<ArgTs...>(Args...); |
1111 | } |
1112 | |
1113 | /// Abandon all outstanding result handlers. |
1114 | /// |
1115 | /// This will call all currently registered result handlers to receive an |
1116 | /// "abandoned" error as their argument. This is used internally by the RPC |
1117 | /// in error situations, but can also be called directly by clients who are |
1118 | /// disconnecting from the remote and don't or can't expect responses to their |
1119 | /// outstanding calls. (Especially for outstanding blocking calls, calling |
1120 | /// this function may be necessary to avoid dead threads). |
1121 | void abandonPendingResponses() { |
1122 | // Lock the pending responses map and sequence number manager. |
1123 | std::lock_guard<std::mutex> Lock(ResponsesMutex); |
1124 | |
1125 | for (auto &KV : PendingResponses) |
1126 | KV.second->abandon(); |
1127 | PendingResponses.clear(); |
1128 | SequenceNumberMgr.reset(); |
1129 | } |
1130 | |
1131 | /// Remove the handler for the given function. |
1132 | /// A handler must currently be registered for this function. |
1133 | template <typename Func> |
1134 | void removeHandler() { |
1135 | auto IdItr = LocalFunctionIds.find(Func::getPrototype()); |
1136 | assert(IdItr != LocalFunctionIds.end() &&((IdItr != LocalFunctionIds.end() && "Function does not have a registered handler" ) ? static_cast<void> (0) : __assert_fail ("IdItr != LocalFunctionIds.end() && \"Function does not have a registered handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1137, __PRETTY_FUNCTION__)) |
1137 | "Function does not have a registered handler")((IdItr != LocalFunctionIds.end() && "Function does not have a registered handler" ) ? static_cast<void> (0) : __assert_fail ("IdItr != LocalFunctionIds.end() && \"Function does not have a registered handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1137, __PRETTY_FUNCTION__)); |
1138 | auto HandlerItr = Handlers.find(IdItr->second); |
1139 | assert(HandlerItr != Handlers.end() &&((HandlerItr != Handlers.end() && "Function does not have a registered handler" ) ? static_cast<void> (0) : __assert_fail ("HandlerItr != Handlers.end() && \"Function does not have a registered handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1140, __PRETTY_FUNCTION__)) |
1140 | "Function does not have a registered handler")((HandlerItr != Handlers.end() && "Function does not have a registered handler" ) ? static_cast<void> (0) : __assert_fail ("HandlerItr != Handlers.end() && \"Function does not have a registered handler\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1140, __PRETTY_FUNCTION__)); |
1141 | Handlers.erase(HandlerItr); |
1142 | } |
1143 | |
1144 | /// Clear all handlers. |
1145 | void clearHandlers() { |
1146 | Handlers.clear(); |
1147 | } |
1148 | |
1149 | protected: |
1150 | |
1151 | FunctionIdT getInvalidFunctionId() const { |
1152 | return FnIdAllocator.getInvalidId(); |
1153 | } |
1154 | |
1155 | /// Add the given handler to the handler map and make it available for |
1156 | /// autonegotiation and execution. |
1157 | template <typename Func, typename HandlerT> |
1158 | void addHandlerImpl(HandlerT Handler) { |
1159 | |
1160 | static_assert(detail::RPCArgTypeCheck< |
1161 | CanDeserializeCheck, typename Func::Type, |
1162 | typename detail::HandlerTraits<HandlerT>::Type>::value, |
1163 | ""); |
1164 | |
1165 | FunctionIdT NewFnId = FnIdAllocator.template allocate<Func>(); |
1166 | LocalFunctionIds[Func::getPrototype()] = NewFnId; |
1167 | Handlers[NewFnId] = wrapHandler<Func>(std::move(Handler)); |
1168 | } |
1169 | |
1170 | template <typename Func, typename HandlerT> |
1171 | void addAsyncHandlerImpl(HandlerT Handler) { |
1172 | |
1173 | static_assert(detail::RPCArgTypeCheck< |
1174 | CanDeserializeCheck, typename Func::Type, |
1175 | typename detail::AsyncHandlerTraits< |
1176 | typename detail::HandlerTraits<HandlerT>::Type |
1177 | >::Type>::value, |
1178 | ""); |
1179 | |
1180 | FunctionIdT NewFnId = FnIdAllocator.template allocate<Func>(); |
1181 | LocalFunctionIds[Func::getPrototype()] = NewFnId; |
1182 | Handlers[NewFnId] = wrapAsyncHandler<Func>(std::move(Handler)); |
1183 | } |
1184 | |
1185 | Error handleResponse(SequenceNumberT SeqNo) { |
1186 | using Handler = typename decltype(PendingResponses)::mapped_type; |
1187 | Handler PRHandler; |
1188 | |
1189 | { |
1190 | // Lock the pending responses map and sequence number manager. |
1191 | std::unique_lock<std::mutex> Lock(ResponsesMutex); |
1192 | auto I = PendingResponses.find(SeqNo); |
1193 | |
1194 | if (I != PendingResponses.end()) { |
1195 | PRHandler = std::move(I->second); |
1196 | PendingResponses.erase(I); |
1197 | SequenceNumberMgr.releaseSequenceNumber(SeqNo); |
1198 | } else { |
1199 | // Unlock the pending results map to prevent recursive lock. |
1200 | Lock.unlock(); |
1201 | abandonPendingResponses(); |
1202 | return make_error< |
1203 | InvalidSequenceNumberForResponse<SequenceNumberT>>(SeqNo); |
1204 | } |
1205 | } |
1206 | |
1207 | assert(PRHandler &&((PRHandler && "If we didn't find a response handler we should have bailed out" ) ? static_cast<void> (0) : __assert_fail ("PRHandler && \"If we didn't find a response handler we should have bailed out\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1208, __PRETTY_FUNCTION__)) |
1208 | "If we didn't find a response handler we should have bailed out")((PRHandler && "If we didn't find a response handler we should have bailed out" ) ? static_cast<void> (0) : __assert_fail ("PRHandler && \"If we didn't find a response handler we should have bailed out\"" , "/build/llvm-toolchain-snapshot-8~svn345461/include/llvm/ExecutionEngine/Orc/RPCUtils.h" , 1208, __PRETTY_FUNCTION__)); |
1209 | |
1210 | if (auto Err = PRHandler->handleResponse(C)) { |
1211 | abandonPendingResponses(); |
1212 | return Err; |
1213 | } |
1214 | |
1215 | return Error::success(); |
1216 | } |
1217 | |
1218 | FunctionIdT handleNegotiate(const std::string &Name) { |
1219 | auto I = LocalFunctionIds.find(Name); |
1220 | if (I == LocalFunctionIds.end()) |
1221 | return getInvalidFunctionId(); |
1222 | return I->second; |
1223 | } |
1224 | |
1225 | // Find the remote FunctionId for the given function. |
1226 | template <typename Func> |
1227 | Expected<FunctionIdT> getRemoteFunctionId(bool NegotiateIfNotInMap, |
1228 | bool NegotiateIfInvalid) { |
1229 | bool DoNegotiate; |
1230 | |
1231 | // Check if we already have a function id... |
1232 | auto I = RemoteFunctionIds.find(Func::getPrototype()); |
1233 | if (I != RemoteFunctionIds.end()) { |
1234 | // If it's valid there's nothing left to do. |
1235 | if (I->second != getInvalidFunctionId()) |
1236 | return I->second; |
1237 | DoNegotiate = NegotiateIfInvalid; |
1238 | } else |
1239 | DoNegotiate = NegotiateIfNotInMap; |
1240 | |
1241 | // We don't have a function id for Func yet, but we're allowed to try to |
1242 | // negotiate one. |
1243 | if (DoNegotiate) { |
1244 | auto &Impl = static_cast<ImplT &>(*this); |
1245 | if (auto RemoteIdOrErr = |
1246 | Impl.template callB<OrcRPCNegotiate>(Func::getPrototype())) { |
1247 | RemoteFunctionIds[Func::getPrototype()] = *RemoteIdOrErr; |
1248 | if (*RemoteIdOrErr == getInvalidFunctionId()) |
1249 | return make_error<CouldNotNegotiate>(Func::getPrototype()); |
1250 | return *RemoteIdOrErr; |
1251 | } else |
1252 | return RemoteIdOrErr.takeError(); |
1253 | } |
1254 | |
1255 | // No key was available in the map and we weren't allowed to try to |
1256 | // negotiate one, so return an unknown function error. |
1257 | return make_error<CouldNotNegotiate>(Func::getPrototype()); |
1258 | } |
1259 | |
1260 | using WrappedHandlerFn = std::function<Error(ChannelT &, SequenceNumberT)>; |
1261 | |
1262 | // Wrap the given user handler in the necessary argument-deserialization code, |
1263 | // result-serialization code, and call to the launch policy (if present). |
1264 | template <typename Func, typename HandlerT> |
1265 | WrappedHandlerFn wrapHandler(HandlerT Handler) { |
1266 | return [this, Handler](ChannelT &Channel, |
1267 | SequenceNumberT SeqNo) mutable -> Error { |
1268 | // Start by deserializing the arguments. |
1269 | using ArgsTuple = |
1270 | typename detail::FunctionArgsTuple< |
1271 | typename detail::HandlerTraits<HandlerT>::Type>::Type; |
1272 | auto Args = std::make_shared<ArgsTuple>(); |
1273 | |
1274 | if (auto Err = |
1275 | detail::HandlerTraits<typename Func::Type>::deserializeArgs( |
1276 | Channel, *Args)) |
1277 | return Err; |
1278 | |
1279 | // GCC 4.7 and 4.8 incorrectly issue a -Wunused-but-set-variable warning |
1280 | // for RPCArgs. Void cast RPCArgs to work around this for now. |
1281 | // FIXME: Remove this workaround once we can assume a working GCC version. |
1282 | (void)Args; |
1283 | |
1284 | // End receieve message, unlocking the channel for reading. |
1285 | if (auto Err = Channel.endReceiveMessage()) |
1286 | return Err; |
1287 | |
1288 | using HTraits = detail::HandlerTraits<HandlerT>; |
1289 | using FuncReturn = typename Func::ReturnType; |
1290 | return detail::respond<FuncReturn>(Channel, ResponseId, SeqNo, |
1291 | HTraits::unpackAndRun(Handler, *Args)); |
1292 | }; |
1293 | } |
1294 | |
1295 | // Wrap the given user handler in the necessary argument-deserialization code, |
1296 | // result-serialization code, and call to the launch policy (if present). |
1297 | template <typename Func, typename HandlerT> |
1298 | WrappedHandlerFn wrapAsyncHandler(HandlerT Handler) { |
1299 | return [this, Handler](ChannelT &Channel, |
1300 | SequenceNumberT SeqNo) mutable -> Error { |
1301 | // Start by deserializing the arguments. |
1302 | using AHTraits = detail::AsyncHandlerTraits< |
1303 | typename detail::HandlerTraits<HandlerT>::Type>; |
1304 | using ArgsTuple = |
1305 | typename detail::FunctionArgsTuple<typename AHTraits::Type>::Type; |
1306 | auto Args = std::make_shared<ArgsTuple>(); |
1307 | |
1308 | if (auto Err = |
1309 | detail::HandlerTraits<typename Func::Type>::deserializeArgs( |
1310 | Channel, *Args)) |
1311 | return Err; |
1312 | |
1313 | // GCC 4.7 and 4.8 incorrectly issue a -Wunused-but-set-variable warning |
1314 | // for RPCArgs. Void cast RPCArgs to work around this for now. |
1315 | // FIXME: Remove this workaround once we can assume a working GCC version. |
1316 | (void)Args; |
1317 | |
1318 | // End receieve message, unlocking the channel for reading. |
1319 | if (auto Err = Channel.endReceiveMessage()) |
1320 | return Err; |
1321 | |
1322 | using HTraits = detail::HandlerTraits<HandlerT>; |
1323 | using FuncReturn = typename Func::ReturnType; |
1324 | auto Responder = |
1325 | [this, SeqNo](typename AHTraits::ResultType RetVal) -> Error { |
1326 | return detail::respond<FuncReturn>(C, ResponseId, SeqNo, |
1327 | std::move(RetVal)); |
1328 | }; |
1329 | |
1330 | return HTraits::unpackAndRunAsync(Handler, Responder, *Args); |
1331 | }; |
1332 | } |
1333 | |
1334 | ChannelT &C; |
1335 | |
1336 | bool LazyAutoNegotiation; |
1337 | |
1338 | RPCFunctionIdAllocator<FunctionIdT> FnIdAllocator; |
1339 | |
1340 | FunctionIdT ResponseId; |
1341 | std::map<std::string, FunctionIdT> LocalFunctionIds; |
1342 | std::map<const char *, FunctionIdT> RemoteFunctionIds; |
1343 | |
1344 | std::map<FunctionIdT, WrappedHandlerFn> Handlers; |
1345 | |
1346 | std::mutex ResponsesMutex; |
1347 | detail::SequenceNumberManager<SequenceNumberT> SequenceNumberMgr; |
1348 | std::map<SequenceNumberT, std::unique_ptr<detail::ResponseHandler<ChannelT>>> |
1349 | PendingResponses; |
1350 | }; |
1351 | |
1352 | } // end namespace detail |
1353 | |
1354 | template <typename ChannelT, typename FunctionIdT = uint32_t, |
1355 | typename SequenceNumberT = uint32_t> |
1356 | class MultiThreadedRPCEndpoint |
1357 | : public detail::RPCEndpointBase< |
1358 | MultiThreadedRPCEndpoint<ChannelT, FunctionIdT, SequenceNumberT>, |
1359 | ChannelT, FunctionIdT, SequenceNumberT> { |
1360 | private: |
1361 | using BaseClass = |
1362 | detail::RPCEndpointBase< |
1363 | MultiThreadedRPCEndpoint<ChannelT, FunctionIdT, SequenceNumberT>, |
1364 | ChannelT, FunctionIdT, SequenceNumberT>; |
1365 | |
1366 | public: |
1367 | MultiThreadedRPCEndpoint(ChannelT &C, bool LazyAutoNegotiation) |
1368 | : BaseClass(C, LazyAutoNegotiation) {} |
1369 | |
1370 | /// Add a handler for the given RPC function. |
1371 | /// This installs the given handler functor for the given RPC Function, and |
1372 | /// makes the RPC function available for negotiation/calling from the remote. |
1373 | template <typename Func, typename HandlerT> |
1374 | void addHandler(HandlerT Handler) { |
1375 | return this->template addHandlerImpl<Func>(std::move(Handler)); |
1376 | } |
1377 | |
1378 | /// Add a class-method as a handler. |
1379 | template <typename Func, typename ClassT, typename RetT, typename... ArgTs> |
1380 | void addHandler(ClassT &Object, RetT (ClassT::*Method)(ArgTs...)) { |
1381 | addHandler<Func>( |
1382 | detail::MemberFnWrapper<ClassT, RetT, ArgTs...>(Object, Method)); |
1383 | } |
1384 | |
1385 | template <typename Func, typename HandlerT> |
1386 | void addAsyncHandler(HandlerT Handler) { |
1387 | return this->template addAsyncHandlerImpl<Func>(std::move(Handler)); |
1388 | } |
1389 | |
1390 | /// Add a class-method as a handler. |
1391 | template <typename Func, typename ClassT, typename RetT, typename... ArgTs> |
1392 | void addAsyncHandler(ClassT &Object, RetT (ClassT::*Method)(ArgTs...)) { |
1393 | addAsyncHandler<Func>( |
1394 | detail::MemberFnWrapper<ClassT, RetT, ArgTs...>(Object, Method)); |
1395 | } |
1396 | |
1397 | /// Return type for non-blocking call primitives. |
1398 | template <typename Func> |
1399 | using NonBlockingCallResult = typename detail::ResultTraits< |
1400 | typename Func::ReturnType>::ReturnFutureType; |
1401 | |
1402 | /// Call Func on Channel C. Does not block, does not call send. Returns a pair |
1403 | /// of a future result and the sequence number assigned to the result. |
1404 | /// |
1405 | /// This utility function is primarily used for single-threaded mode support, |
1406 | /// where the sequence number can be used to wait for the corresponding |
1407 | /// result. In multi-threaded mode the appendCallNB method, which does not |
1408 | /// return the sequence numeber, should be preferred. |
1409 | template <typename Func, typename... ArgTs> |
1410 | Expected<NonBlockingCallResult<Func>> appendCallNB(const ArgTs &... Args) { |
1411 | using RTraits = detail::ResultTraits<typename Func::ReturnType>; |
1412 | using ErrorReturn = typename RTraits::ErrorReturnType; |
1413 | using ErrorReturnPromise = typename RTraits::ReturnPromiseType; |
1414 | |
1415 | // FIXME: Stack allocate and move this into the handler once LLVM builds |
1416 | // with C++14. |
1417 | auto Promise = std::make_shared<ErrorReturnPromise>(); |
1418 | auto FutureResult = Promise->get_future(); |
1419 | |
1420 | if (auto Err = this->template appendCallAsync<Func>( |
1421 | [Promise](ErrorReturn RetOrErr) { |
1422 | Promise->set_value(std::move(RetOrErr)); |
1423 | return Error::success(); |
1424 | }, |
1425 | Args...)) { |
1426 | RTraits::consumeAbandoned(FutureResult.get()); |
1427 | return std::move(Err); |
1428 | } |
1429 | return std::move(FutureResult); |
1430 | } |
1431 | |
1432 | /// The same as appendCallNBWithSeq, except that it calls C.send() to |
1433 | /// flush the channel after serializing the call. |
1434 | template <typename Func, typename... ArgTs> |
1435 | Expected<NonBlockingCallResult<Func>> callNB(const ArgTs &... Args) { |
1436 | auto Result = appendCallNB<Func>(Args...); |
1437 | if (!Result) |
1438 | return Result; |
1439 | if (auto Err = this->C.send()) { |
1440 | this->abandonPendingResponses(); |
1441 | detail::ResultTraits<typename Func::ReturnType>::consumeAbandoned( |
1442 | std::move(Result->get())); |
1443 | return std::move(Err); |
1444 | } |
1445 | return Result; |
1446 | } |
1447 | |
1448 | /// Call Func on Channel C. Blocks waiting for a result. Returns an Error |
1449 | /// for void functions or an Expected<T> for functions returning a T. |
1450 | /// |
1451 | /// This function is for use in threaded code where another thread is |
1452 | /// handling responses and incoming calls. |
1453 | template <typename Func, typename... ArgTs, |
1454 | typename AltRetT = typename Func::ReturnType> |
1455 | typename detail::ResultTraits<AltRetT>::ErrorReturnType |
1456 | callB(const ArgTs &... Args) { |
1457 | if (auto FutureResOrErr = callNB<Func>(Args...)) |
1458 | return FutureResOrErr->get(); |
1459 | else |
1460 | return FutureResOrErr.takeError(); |
1461 | } |
1462 | |
1463 | /// Handle incoming RPC calls. |
1464 | Error handlerLoop() { |
1465 | while (true) |
1466 | if (auto Err = this->handleOne()) |
1467 | return Err; |
1468 | return Error::success(); |
1469 | } |
1470 | }; |
1471 | |
1472 | template <typename ChannelT, typename FunctionIdT = uint32_t, |
1473 | typename SequenceNumberT = uint32_t> |
1474 | class SingleThreadedRPCEndpoint |
1475 | : public detail::RPCEndpointBase< |
1476 | SingleThreadedRPCEndpoint<ChannelT, FunctionIdT, SequenceNumberT>, |
1477 | ChannelT, FunctionIdT, SequenceNumberT> { |
1478 | private: |
1479 | using BaseClass = |
1480 | detail::RPCEndpointBase< |
1481 | SingleThreadedRPCEndpoint<ChannelT, FunctionIdT, SequenceNumberT>, |
1482 | ChannelT, FunctionIdT, SequenceNumberT>; |
1483 | |
1484 | public: |
1485 | SingleThreadedRPCEndpoint(ChannelT &C, bool LazyAutoNegotiation) |
1486 | : BaseClass(C, LazyAutoNegotiation) {} |
1487 | |
1488 | template <typename Func, typename HandlerT> |
1489 | void addHandler(HandlerT Handler) { |
1490 | return this->template addHandlerImpl<Func>(std::move(Handler)); |
1491 | } |
1492 | |
1493 | template <typename Func, typename ClassT, typename RetT, typename... ArgTs> |
1494 | void addHandler(ClassT &Object, RetT (ClassT::*Method)(ArgTs...)) { |
1495 | addHandler<Func>( |
1496 | detail::MemberFnWrapper<ClassT, RetT, ArgTs...>(Object, Method)); |
1497 | } |
1498 | |
1499 | template <typename Func, typename HandlerT> |
1500 | void addAsyncHandler(HandlerT Handler) { |
1501 | return this->template addAsyncHandlerImpl<Func>(std::move(Handler)); |
1502 | } |
1503 | |
1504 | /// Add a class-method as a handler. |
1505 | template <typename Func, typename ClassT, typename RetT, typename... ArgTs> |
1506 | void addAsyncHandler(ClassT &Object, RetT (ClassT::*Method)(ArgTs...)) { |
1507 | addAsyncHandler<Func>( |
1508 | detail::MemberFnWrapper<ClassT, RetT, ArgTs...>(Object, Method)); |
1509 | } |
1510 | |
1511 | template <typename Func, typename... ArgTs, |
1512 | typename AltRetT = typename Func::ReturnType> |
1513 | typename detail::ResultTraits<AltRetT>::ErrorReturnType |
1514 | callB(const ArgTs &... Args) { |
1515 | bool ReceivedResponse = false; |
1516 | using ResultType = typename detail::ResultTraits<AltRetT>::ErrorReturnType; |
1517 | auto Result = detail::ResultTraits<AltRetT>::createBlankErrorReturnValue(); |
1518 | |
1519 | // We have to 'Check' result (which we know is in a success state at this |
1520 | // point) so that it can be overwritten in the async handler. |
1521 | (void)!!Result; |
1522 | |
1523 | if (auto Err = this->template appendCallAsync<Func>( |
1524 | [&](ResultType R) { |
1525 | Result = std::move(R); |
1526 | ReceivedResponse = true; |
1527 | return Error::success(); |
1528 | }, |
1529 | Args...)) { |
1530 | detail::ResultTraits<typename Func::ReturnType>::consumeAbandoned( |
1531 | std::move(Result)); |
1532 | return std::move(Err); |
1533 | } |
1534 | |
1535 | while (!ReceivedResponse) { |
1536 | if (auto Err = this->handleOne()) { |
1537 | detail::ResultTraits<typename Func::ReturnType>::consumeAbandoned( |
1538 | std::move(Result)); |
1539 | return std::move(Err); |
1540 | } |
1541 | } |
1542 | |
1543 | return Result; |
1544 | } |
1545 | }; |
1546 | |
1547 | /// Asynchronous dispatch for a function on an RPC endpoint. |
1548 | template <typename RPCClass, typename Func> |
1549 | class RPCAsyncDispatch { |
1550 | public: |
1551 | RPCAsyncDispatch(RPCClass &Endpoint) : Endpoint(Endpoint) {} |
1552 | |
1553 | template <typename HandlerT, typename... ArgTs> |
1554 | Error operator()(HandlerT Handler, const ArgTs &... Args) const { |
1555 | return Endpoint.template appendCallAsync<Func>(std::move(Handler), Args...); |
1556 | } |
1557 | |
1558 | private: |
1559 | RPCClass &Endpoint; |
1560 | }; |
1561 | |
1562 | /// Construct an asynchronous dispatcher from an RPC endpoint and a Func. |
1563 | template <typename Func, typename RPCEndpointT> |
1564 | RPCAsyncDispatch<RPCEndpointT, Func> rpcAsyncDispatch(RPCEndpointT &Endpoint) { |
1565 | return RPCAsyncDispatch<RPCEndpointT, Func>(Endpoint); |
1566 | } |
1567 | |
1568 | /// Allows a set of asynchrounous calls to be dispatched, and then |
1569 | /// waited on as a group. |
1570 | class ParallelCallGroup { |
1571 | public: |
1572 | |
1573 | ParallelCallGroup() = default; |
1574 | ParallelCallGroup(const ParallelCallGroup &) = delete; |
1575 | ParallelCallGroup &operator=(const ParallelCallGroup &) = delete; |
1576 | |
1577 | /// Make as asynchronous call. |
1578 | template <typename AsyncDispatcher, typename HandlerT, typename... ArgTs> |
1579 | Error call(const AsyncDispatcher &AsyncDispatch, HandlerT Handler, |
1580 | const ArgTs &... Args) { |
1581 | // Increment the count of outstanding calls. This has to happen before |
1582 | // we invoke the call, as the handler may (depending on scheduling) |
1583 | // be run immediately on another thread, and we don't want the decrement |
1584 | // in the wrapped handler below to run before the increment. |
1585 | { |
1586 | std::unique_lock<std::mutex> Lock(M); |
1587 | ++NumOutstandingCalls; |
1588 | } |
1589 | |
1590 | // Wrap the user handler in a lambda that will decrement the |
1591 | // outstanding calls count, then poke the condition variable. |
1592 | using ArgType = typename detail::ResponseHandlerArg< |
1593 | typename detail::HandlerTraits<HandlerT>::Type>::ArgType; |
1594 | // FIXME: Move handler into wrapped handler once we have C++14. |
1595 | auto WrappedHandler = [this, Handler](ArgType Arg) { |
1596 | auto Err = Handler(std::move(Arg)); |
1597 | std::unique_lock<std::mutex> Lock(M); |
1598 | --NumOutstandingCalls; |
1599 | CV.notify_all(); |
1600 | return Err; |
1601 | }; |
1602 | |
1603 | return AsyncDispatch(std::move(WrappedHandler), Args...); |
1604 | } |
1605 | |
1606 | /// Blocks until all calls have been completed and their return value |
1607 | /// handlers run. |
1608 | void wait() { |
1609 | std::unique_lock<std::mutex> Lock(M); |
1610 | while (NumOutstandingCalls > 0) |
1611 | CV.wait(Lock); |
1612 | } |
1613 | |
1614 | private: |
1615 | std::mutex M; |
1616 | std::condition_variable CV; |
1617 | uint32_t NumOutstandingCalls = 0; |
1618 | }; |
1619 | |
1620 | /// Convenience class for grouping RPC Functions into APIs that can be |
1621 | /// negotiated as a block. |
1622 | /// |
1623 | template <typename... Funcs> |
1624 | class APICalls { |
1625 | public: |
1626 | |
1627 | /// Test whether this API contains Function F. |
1628 | template <typename F> |
1629 | class Contains { |
1630 | public: |
1631 | static const bool value = false; |
1632 | }; |
1633 | |
1634 | /// Negotiate all functions in this API. |
1635 | template <typename RPCEndpoint> |
1636 | static Error negotiate(RPCEndpoint &R) { |
1637 | return Error::success(); |
1638 | } |
1639 | }; |
1640 | |
1641 | template <typename Func, typename... Funcs> |
1642 | class APICalls<Func, Funcs...> { |
1643 | public: |
1644 | |
1645 | template <typename F> |
1646 | class Contains { |
1647 | public: |
1648 | static const bool value = std::is_same<F, Func>::value | |
1649 | APICalls<Funcs...>::template Contains<F>::value; |
1650 | }; |
1651 | |
1652 | template <typename RPCEndpoint> |
1653 | static Error negotiate(RPCEndpoint &R) { |
1654 | if (auto Err = R.template negotiateFunction<Func>()) |
1655 | return Err; |
1656 | return APICalls<Funcs...>::negotiate(R); |
1657 | } |
1658 | |
1659 | }; |
1660 | |
1661 | template <typename... InnerFuncs, typename... Funcs> |
1662 | class APICalls<APICalls<InnerFuncs...>, Funcs...> { |
1663 | public: |
1664 | |
1665 | template <typename F> |
1666 | class Contains { |
1667 | public: |
1668 | static const bool value = |
1669 | APICalls<InnerFuncs...>::template Contains<F>::value | |
1670 | APICalls<Funcs...>::template Contains<F>::value; |
1671 | }; |
1672 | |
1673 | template <typename RPCEndpoint> |
1674 | static Error negotiate(RPCEndpoint &R) { |
1675 | if (auto Err = APICalls<InnerFuncs...>::negotiate(R)) |
1676 | return Err; |
1677 | return APICalls<Funcs...>::negotiate(R); |
1678 | } |
1679 | |
1680 | }; |
1681 | |
1682 | } // end namespace rpc |
1683 | } // end namespace orc |
1684 | } // end namespace llvm |
1685 | |
1686 | #endif |
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 |