src/gromacs/utility/exceptions.cpp

   1 /*
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  36 /*! \internal \file
  37  * \brief
  38  * Implements classes and functions in exceptions.h.
  39  *
  40  * \author Teemu Murtola <teemu.murtola@gmail.com>
  41  * \ingroup module_utility
  42  */
  43 #include "gmxpre.h"
  44
  45 #include "exceptions.h"
  46
  47 #include <cstring>
  48
  49 #include <map>
  50 #include <memory>
  51 #include <new>
  52 #include <stdexcept>
  53 #include <typeinfo>
  54
  55 #include "thread_mpi/system_error.h"
  56
  57 #include "gromacs/utility/basenetwork.h"
  58 #include "gromacs/utility/fatalerror.h"
  59 #include "gromacs/utility/gmxassert.h"
  60 #include "gromacs/utility/stringutil.h"
  61 #include "gromacs/utility/textwriter.h"
  62
  63 #include "errorcodes.h"
  64 #include "errorformat.h"
  65
  66 namespace gmx
  67 {
  68
  69 namespace internal
  70 {
  71
  72 IExceptionInfo::~IExceptionInfo() {}
  73
  74 class ExceptionData
  75 {
  76 public:
  77     std::map<std::type_index, ExceptionInfoPointer> infos_;
  78 };
  79
  80 } // namespace internal
  81
  82 namespace
  83 {
  84
  85 /********************************************************************
  86  * ErrorMessage
  87  */
  88
  89 /*! \brief
  90  * Error message or error context text item.
  91  *
  92  * Error messages for an exception are represented as a chain of ErrorMessage
  93  * objects: the elements at the bottom of the chain (with no children) is the
  94  * error message, and other elements are the context strings added.
  95  *
  96  * \ingroup module_utility
  97  */
  98 class ErrorMessage
  99 {
 100 public:
 101     /*! \brief
 102      * Creates an error message object with the specified text.
 103      *
 104      * \param[in] text  Text for the message.
 105      */
 106     explicit ErrorMessage(const std::string& text);
 107
 108     //! Whether this object is a context string.
 109     bool isContext() const { return static_cast<bool>(child_); }
 110     //! Returns the text for this object.
 111     const std::string& text() const { return text_; }
 112     /*! \brief
 113      * Returns the child object for a context object.
 114      *
 115      * Must not be called if isContext() returns false.
 116      */
 117     const ErrorMessage& child() const
 118     {
 119         GMX_ASSERT(isContext(), "Attempting to access nonexistent message object");
 120         return *child_;
 121     }
 122
 123     /*! \brief
 124      * Creates a new message object with context prepended.
 125      *
 126      * \param[in] context  Context string to add.
 127      * \returns   New error message object that has \p context as its text
 128      *      and \c this as its child.
 129      * \throws    std::bad_alloc if out of memory.
 130      */
 131     ErrorMessage prependContext(const std::string& context) const;
 132
 133 private:
 134     std::string                   text_;
 135     std::shared_ptr<ErrorMessage> child_;
 136 };
 137
 138 /*! \internal \brief
 139  * Stores a reason or the top-most context string of an exception.
 140  *
 141  * \ingroup module_utility
 142  */
 143 typedef ExceptionInfo<struct ExceptionInfoMessage_, ErrorMessage> ExceptionInfoMessage;
 144
 145 ErrorMessage::ErrorMessage(const std::string& text) : text_(text)
 146 {
 147     size_t length = text_.find_last_not_of(" \n");
 148     if (length == std::string::npos)
 149     {
 150         length = text_.length() - 1;
 151     }
 152     text_.resize(length + 1);
 153 }
 154
 155 ErrorMessage ErrorMessage::prependContext(const std::string& context) const
 156 {
 157     ErrorMessage newMessage(context);
 158     newMessage.child_ = std::make_shared<ErrorMessage>(*this);
 159     return newMessage;
 160 }
 161
 162 /*! \brief
 163  * Stores list of nested exceptions for Gromacs exceptions.
 164  *
 165  * \ingroup module_utility
 166  */
 167 typedef ExceptionInfo<struct ExceptionInfoNestedExceptions_, internal::NestedExceptionList> ExceptionInfoNestedExceptions;
 168
 169 } // namespace
 170
 171 /********************************************************************
 172  * GromacsException
 173  */
 174
 175 GromacsException::GromacsException(const ExceptionInitializer& details) :
 176     data_(new internal::ExceptionData)
 177 {
 178     setInfo(ExceptionInfoMessage(ErrorMessage(details.reason_)));
 179     if (details.hasNestedExceptions())
 180     {
 181         setInfo(ExceptionInfoNestedExceptions(details.nested_));
 182     }
 183 }
 184
 185 const char* GromacsException::what() const noexcept
 186 {
 187     const ErrorMessage* msg = getInfo<ExceptionInfoMessage>();
 188     if (msg == nullptr)
 189     {
 190         return "No reason provided";
 191     }
 192     while (msg->isContext())
 193     {
 194         msg = &msg->child();
 195     }
 196     return msg->text().c_str();
 197 }
 198
 199 void GromacsException::prependContext(const std::string& context)
 200 {
 201     const ErrorMessage* msg = getInfo<ExceptionInfoMessage>();
 202     GMX_RELEASE_ASSERT(msg != nullptr, "Message should always be set");
 203     setInfo(ExceptionInfoMessage(msg->prependContext(context)));
 204 }
 205
 206 const internal::IExceptionInfo* GromacsException::getInfo(const std::type_index& index) const
 207 {
 208     auto iter = data_->infos_.find(index);
 209     if (iter != data_->infos_.end())
 210     {
 211         return iter->second.get();
 212     }
 213     return nullptr;
 214 }
 215
 216 void GromacsException::setInfo(const std::type_index& index, internal::ExceptionInfoPointer&& item)
 217 {
 218     data_->infos_[index] = std::move(item);
 219 }
 220
 221 /********************************************************************
 222  * Derived exception classes
 223  */
 224
 225 int FileIOError::errorCode() const
 226 {
 227     return eeFileIO;
 228 }
 229
 230 int InvalidInputError::errorCode() const
 231 {
 232     return eeInvalidInput;
 233 }
 234
 235 int InconsistentInputError::errorCode() const
 236 {
 237     return eeInconsistentInput;
 238 }
 239
 240 int ToleranceError::errorCode() const
 241 {
 242     return eeTolerance;
 243 }
 244
 245 int SimulationInstabilityError::errorCode() const
 246 {
 247     return eeInstability;
 248 }
 249
 250 int InternalError::errorCode() const
 251 {
 252     return eeInternalError;
 253 }
 254
 255 int APIError::errorCode() const
 256 {
 257     return eeAPIError;
 258 }
 259
 260 int RangeError::errorCode() const
 261 {
 262     return eeRange;
 263 }
 264
 265 int NotImplementedError::errorCode() const
 266 {
 267     return eeNotImplemented;
 268 }
 269
 270 int ParallelConsistencyError::errorCode() const
 271 {
 272     return eeParallelConsistency;
 273 }
 274
 275 int ModularSimulatorError::errorCode() const
 276 {
 277     return eeModularSimulator;
 278 }
 279
 280
 281 /********************************************************************
 282  * Global functions
 283  */
 284
 285 namespace
 286 {
 287
 288 //! \addtogroup module_utility
 289 //! \{
 290
 291 /*! \brief
 292  * Abstracts actual output from the other logic in exception formatting.
 293  *
 294  * Object that implements this interface is passed to
 295  * formatExceptionMessageInternal(), and is responsible for composing the
 296  * output.  This allows using the same implementation of interpreting the
 297  * exceptions while still supporting output to different formats (e.g., to a
 298  * string or to \c stderr).
 299  */
 300 class IMessageWriter
 301 {
 302 public:
 303     virtual ~IMessageWriter() {}
 304
 305     /*! \brief
 306      * Writes a single line of text into the output.
 307      *
 308      * \param[in] text    Text to write on the line.
 309      * \param[in] indent  Suggested number of spaces to indent the line.
 310      */
 311     virtual void writeLine(const char* text, int indent) = 0;
 312     /*! \brief
 313      * Writes information about a system error (errno-based).
 314      *
 315      * \param[in] errorNumber  errno value
 316      * \param[in] funcName     Name of the system call (can be NULL).
 317      * \param[in] indent       Suggested number of spaces to indent the output.
 318      */
 319     virtual void writeErrNoInfo(int errorNumber, const char* funcName, int indent) = 0;
 320 };
 321
 322 /*! \brief
 323  * Exception information writer for cases where exceptions should be avoided.
 324  *
 325  * Formats the messages into the provided FILE handle without checking for
 326  * errors in std::fprintf() calls.
 327  */
 328 class MessageWriterFileNoThrow : public IMessageWriter
 329 {
 330 public:
 331     //! Initializes a writer that writes to the given file handle.
 332     explicit MessageWriterFileNoThrow(FILE* fp) : fp_(fp) {}
 333
 334     void writeLine(const char* text, int indent) override
 335     {
 336         internal::printFatalErrorMessageLine(fp_, text, indent);
 337     }
 338     void writeErrNoInfo(int errorNumber, const char* funcName, int indent) override
 339     {
 340         std::fprintf(fp_, "%*sReason: %s\n", indent, "", std::strerror(errorNumber));
 341         if (funcName != nullptr)
 342         {
 343             std::fprintf(fp_, "%*s(call to %s() returned error code %d)\n", indent, "", funcName,
 344                          errorNumber);
 345         }
 346     }
 347
 348 private:
 349     FILE* fp_;
 350 };
 351
 352 /*! \brief
 353  * Exception information writer to format into a TextOutputStream.
 354  */
 355 class MessageWriterTextWriter : public IMessageWriter
 356 {
 357 public:
 358     //! Initializes a writer that writes to the given stream.
 359     explicit MessageWriterTextWriter(TextWriter* writer) : writer_(writer) {}
 360
 361     void writeLine(const char* text, int indent) override
 362     {
 363         writer_->wrapperSettings().setIndent(indent);
 364         writer_->writeLine(text);
 365     }
 366     void writeErrNoInfo(int errorNumber, const char* funcName, int indent) override
 367     {
 368         writer_->wrapperSettings().setIndent(indent);
 369         writer_->writeLine(formatString("Reason: %s", std::strerror(errorNumber)));
 370         if (funcName != nullptr)
 371         {
 372             writer_->writeLine(formatString("(call to %s() returned error code %d)", funcName, errorNumber));
 373         }
 374     }
 375
 376 private:
 377     TextWriter* writer_;
 378 };
 379
 380 /*! \brief
 381  * Exception information writer to format into an std::string.
 382  */
 383 class MessageWriterString : public IMessageWriter
 384 {
 385 public:
 386     //! Post-processes the output string to not end in a line feed.
 387     void removeTerminatingLineFeed()
 388     {
 389         if (!result_.empty())
 390         {
 391             result_.erase(result_.size() - 1);
 392         }
 393     }
 394     //! Returns the constructed string.
 395     const std::string& result() const { return result_; }
 396
 397     void writeLine(const char* text, int indent) override
 398     {
 399         result_.append(indent, ' ');
 400         result_.append(text);
 401         result_.append("\n");
 402     }
 403     void writeErrNoInfo(int errorNumber, const char* funcName, int indent) override
 404     {
 405         writeLine(formatString("Reason: %s", std::strerror(errorNumber)).c_str(), indent);
 406         if (funcName != nullptr)
 407         {
 408             writeLine(formatString("(call to %s() returned error code %d)", funcName, errorNumber).c_str(),
 409                       indent);
 410         }
 411     }
 412
 413 private:
 414     std::string result_;
 415 };
 416
 417 /*! \brief
 418  * Prints error information for an exception object.
 419  *
 420  * \param[in] writer  Writer to write out the information.
 421  * \param[in] ex      Exception object to print.
 422  * \param[in] indent  Indentation for the information.
 423  *
 424  * If the exception contains nested exceptions, information from them is
 425  * recursively printed.
 426  *
 427  * Does not throw unless the writer throws.
 428  */
 429 void formatExceptionMessageInternal(IMessageWriter* writer, const std::exception& ex, int indent)
 430 {
 431     const GromacsException* gmxEx = dynamic_cast<const GromacsException*>(&ex);
 432     if (gmxEx != nullptr)
 433     {
 434         // TODO: Add an option to print location information for the tests
 435
 436         // std::string        result;
 437         // if (filePtr != NULL && linePtr != NULL)
 438         // {
 439         //     result = formatString("%s:%d: %s\n", *filePtr, *linePtr,
 440         //                           funcPtr != NULL ? *funcPtr : "");
 441         // }
 442
 443         bool bAnythingWritten = false;
 444         // TODO: Remove duplicate context if present in multiple nested exceptions.
 445         const ErrorMessage* msg = gmxEx->getInfo<ExceptionInfoMessage>();
 446         if (msg != nullptr)
 447         {
 448             while (msg != nullptr && msg->isContext())
 449             {
 450                 writer->writeLine(msg->text().c_str(), indent * 2);
 451                 ++indent;
 452                 msg = &msg->child();
 453             }
 454             if (msg != nullptr && !msg->text().empty())
 455             {
 456                 writer->writeLine(msg->text().c_str(), indent * 2);
 457                 bAnythingWritten = true;
 458             }
 459         }
 460         else
 461         {
 462             writer->writeLine(ex.what(), indent * 2);
 463             bAnythingWritten = true;
 464         }
 465
 466         const int* errorNumber = gmxEx->getInfo<ExceptionInfoErrno>();
 467         if (errorNumber != nullptr && *errorNumber != 0)
 468         {
 469             const char* const* funcName = gmxEx->getInfo<ExceptionInfoApiFunction>();
 470             writer->writeErrNoInfo(*errorNumber, funcName != nullptr ? *funcName : nullptr,
 471                                    (indent + 1) * 2);
 472             bAnythingWritten = true;
 473         }
 474
 475         const internal::NestedExceptionList* nested = gmxEx->getInfo<ExceptionInfoNestedExceptions>();
 476         if (nested != nullptr)
 477         {
 478             internal::NestedExceptionList::const_iterator ni;
 479             for (ni = nested->begin(); ni != nested->end(); ++ni)
 480             {
 481                 try
 482                 {
 483                     std::rethrow_exception(*ni);
 484                 }
 485                 catch (const std::exception& nestedEx)
 486                 {
 487                     const int newIndent = indent + (bAnythingWritten ? 1 : 0);
 488                     formatExceptionMessageInternal(writer, nestedEx, newIndent);
 489                 }
 490             }
 491         }
 492     }
 493     else
 494     {
 495         writer->writeLine(ex.what(), indent * 2);
 496     }
 497 }
 498
 499 //! \}
 500
 501 } // namespace
 502
 503 void printFatalErrorMessage(FILE* fp, const std::exception& ex)
 504 {
 505     const char*             title      = "Unknown exception";
 506     bool                    bPrintType = false;
 507     const GromacsException* gmxEx      = dynamic_cast<const GromacsException*>(&ex);
 508     // TODO: Treat more of the standard exceptions
 509     if (gmxEx != nullptr)
 510     {
 511         title = getErrorCodeString(gmxEx->errorCode());
 512     }
 513     else if (dynamic_cast<const tMPI::system_error*>(&ex) != nullptr)
 514     {
 515         title = "System error in thread synchronization";
 516     }
 517     else if (dynamic_cast<const std::bad_alloc*>(&ex) != nullptr)
 518     {
 519         title = "Memory allocation failed";
 520     }
 521     else if (dynamic_cast<const std::logic_error*>(&ex) != nullptr)
 522     {
 523         title      = "Standard library logic error (bug)";
 524         bPrintType = true;
 525     }
 526     else if (dynamic_cast<const std::runtime_error*>(&ex) != nullptr)
 527     {
 528         title      = "Standard library runtime error (possible bug)";
 529         bPrintType = true;
 530     }
 531     else
 532     {
 533         bPrintType = true;
 534     }
 535     const char* func = nullptr;
 536     const char* file = nullptr;
 537     int         line = 0;
 538     if (gmxEx != nullptr)
 539     {
 540         const ThrowLocation* loc = gmxEx->getInfo<ExceptionInfoLocation>();
 541         if (loc != nullptr)
 542         {
 543             func = loc->func;
 544             file = loc->file;
 545             line = loc->line;
 546         }
 547     }
 548     internal::printFatalErrorHeader(fp, title, func, file, line);
 549     if (bPrintType)
 550     {
 551         std::fprintf(fp, "(exception type: %s)\n", typeid(ex).name());
 552     }
 553     MessageWriterFileNoThrow writer(fp);
 554     formatExceptionMessageInternal(&writer, ex, 0);
 555     internal::printFatalErrorFooter(fp);
 556 }
 557
 558 std::string formatExceptionMessageToString(const std::exception& ex)
 559 {
 560     MessageWriterString writer;
 561     formatExceptionMessageInternal(&writer, ex, 0);
 562     writer.removeTerminatingLineFeed();
 563     return writer.result();
 564 }
 565
 566 void formatExceptionMessageToFile(FILE* fp, const std::exception& ex)
 567 {
 568     MessageWriterFileNoThrow writer(fp);
 569     formatExceptionMessageInternal(&writer, ex, 0);
 570 }
 571
 572 void formatExceptionMessageToWriter(TextWriter* writer, const std::exception& ex)
 573 {
 574     MessageWriterTextWriter messageWriter(writer);
 575     formatExceptionMessageInternal(&messageWriter, ex, 0);
 576 }
 577
 578 int processExceptionAtExit(const std::exception& /*ex*/)
 579 {
 580     int returnCode = 1;
 581     // If we have more than one rank (whether real MPI or thread-MPI),
 582     // we cannot currently know whether just one rank or all ranks
 583     // actually threw the error, so we need to exit here.
 584     // Returning would mean graceful cleanup, which is not possible if
 585     // some code is still executing on other ranks/threads.
 586     if (gmx_node_num() > 1)
 587     {
 588         gmx_exit_on_fatal_error(ExitType_Abort, returnCode);
 589     }
 590     return returnCode;
 591 }
 592
 593 void processExceptionAsFatalError(const std::exception& ex)
 594 {
 595     printFatalErrorMessage(stderr, ex);
 596     gmx_exit_on_fatal_error(ExitType_Abort, 1);
 597 }
 598
 599 } // namespace gmx