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Diffstat (limited to 'libsupport/include/CoreLib/Error/ErrorHandling.h')
| -rw-r--r-- | libsupport/include/CoreLib/Error/ErrorHandling.h | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/libsupport/include/CoreLib/Error/ErrorHandling.h b/libsupport/include/CoreLib/Error/ErrorHandling.h new file mode 100644 index 0000000..5ab5a9e --- /dev/null +++ b/libsupport/include/CoreLib/Error/ErrorHandling.h @@ -0,0 +1,217 @@ +/* + RCC-Project + + Copyright (C) 2026 Richard Qin + + This file is part of RCC-Project. + + RCC-Project is free software; you can redistribute it and/or modify it under + the terms of the GNU General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your option) any + later version. + + RCC-Project is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along with + RCC-Project; see the file COPYING. If not see + <http://www.gnu.org/licenses/>. + */ + +//===- llvm/Support/ErrorHandling.h - Fatal error handling ------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This file defines an API used to indicate fatal error conditions. Non-fatal +// errors (most of them) should be handled through LLVMContext. +// +//===----------------------------------------------------------------------===// + +#ifndef RCC_SUPPORT_ERRORHANDLING_H +#define RCC_SUPPORT_ERRORHANDLING_H + +#include "CoreLib/Compiler/Compiler.h" + +namespace rcc +{ +class StringRef; +class Twine; + +/// An error handler callback. +using fatal_error_handler_t = void (*) (void *user_data, const char *reason, + bool gen_crash_diag); + +/// install_fatal_error_handler - Installs a new error handler to be used +/// whenever a serious (non-recoverable) error is encountered by LLVM. +/// +/// If no error handler is installed the default is to print the error message +/// to stderr, and call exit(1). If an error handler is installed then it is +/// the handler's responsibility to log the message, it will no longer be +/// printed to stderr. If the error handler returns, then exit(1) will be +/// called. +/// +/// It is dangerous to naively use an error handler which throws an exception. +/// Even though some applications desire to gracefully recover from arbitrary +/// faults, blindly throwing exceptions through unfamiliar code isn't a way to +/// achieve this. +/// +/// \param user_data - An argument which will be passed to the install error +/// handler. +RCC_ABI void +install_fatal_error_handler (fatal_error_handler_t handler, + void *user_data = nullptr); + +/// Restores default error handling behaviour. +RCC_ABI void +remove_fatal_error_handler (); + +/// ScopedFatalErrorHandler - This is a simple helper class which just +/// calls install_fatal_error_handler in its constructor and +/// remove_fatal_error_handler in its destructor. +struct ScopedFatalErrorHandler +{ + explicit ScopedFatalErrorHandler (fatal_error_handler_t handler, + void *user_data = nullptr) + { + install_fatal_error_handler (handler, user_data); + } + + ~ScopedFatalErrorHandler () + { + remove_fatal_error_handler (); + } +}; + +/// @deprecated Use reportFatalInternalError() or reportFatalUsageError() +/// instead. +[[noreturn]] RCC_ABI void +report_fatal_error (const char *reason, bool gen_crash_diag = true); +[[noreturn]] RCC_ABI void +report_fatal_error (StringRef reason, bool gen_crash_diag = true); +[[noreturn]] RCC_ABI void +report_fatal_error (const Twine &reason, bool gen_crash_diag = true); + +/// Report a fatal error that likely indicates a bug in LLVM. It serves a +/// similar purpose as an assertion, but is always enabled, regardless of the +/// value of NDEBUG. +/// +/// This will call installed error handlers (or print the message by default) +/// and then abort. This will produce a crash trace and *will* ask users to +/// report an LLVM bug. +[[noreturn]] RCC_ABI void +reportFatalInternalError (const char *reason); +[[noreturn]] RCC_ABI void +reportFatalInternalError (StringRef reason); +[[noreturn]] RCC_ABI void +reportFatalInternalError (const Twine &reason); + +/// Report a fatal error that does not indicate a bug in LLVM. +/// +/// This can be used in contexts where a proper error reporting mechanism +/// (such as Error/Expected or DiagnosticInfo) is currently not supported, and +/// would be too involved to introduce at the moment. +/// +/// Examples where this function should be used instead of +/// reportFatalInternalError() include invalid inputs or options, but also +/// environment error conditions outside LLVM's control. It should also be used +/// for known unsupported/unimplemented functionality. +/// +/// This will call installed error handlers (or print the message by default) +/// and then exit with code 1. It will not produce a crash trace and will +/// *not* ask users to report an LLVM bug. +[[noreturn]] RCC_ABI void +reportFatalUsageError (const char *reason); +[[noreturn]] RCC_ABI void +reportFatalUsageError (StringRef reason); +[[noreturn]] RCC_ABI void +reportFatalUsageError (const Twine &reason); + +/// Installs a new bad alloc error handler that should be used whenever a +/// bad alloc error, e.g. failing malloc/calloc, is encountered by LLVM. +/// +/// The user can install a bad alloc handler, in order to define the behavior +/// in case of failing allocations, e.g. throwing an exception. Note that this +/// handler must not trigger any additional allocations itself. +/// +/// If no error handler is installed the default is to print the error message +/// to stderr, and call exit(1). If an error handler is installed then it is +/// the handler's responsibility to log the message, it will no longer be +/// printed to stderr. If the error handler returns, then exit(1) will be +/// called. +/// +/// +/// \param user_data - An argument which will be passed to the installed error +/// handler. +RCC_ABI void +install_bad_alloc_error_handler (fatal_error_handler_t handler, + void *user_data = nullptr); + +/// Restores default bad alloc error handling behavior. +RCC_ABI void +remove_bad_alloc_error_handler (); + +RCC_ABI void +install_out_of_memory_new_handler (); + +/// Reports a bad alloc error, calling any user defined bad alloc +/// error handler. In contrast to the generic 'report_fatal_error' +/// functions, this function might not terminate, e.g. the user +/// defined error handler throws an exception, but it won't return. +/// +/// Note: When throwing an exception in the bad alloc handler, make sure that +/// the following unwind succeeds, e.g. do not trigger additional allocations +/// in the unwind chain. +/// +/// If no error handler is installed (default), throws a bad_alloc exception +/// if LLVM is compiled with exception support. Otherwise prints the error +/// to standard error and calls abort(). +[[noreturn]] RCC_ABI void +report_bad_alloc_error (const char *Reason, bool GenCrashDiag = true); + +/// This function calls abort(), and prints the optional message to stderr. +/// Use the llvm_unreachable macro (that adds location info), instead of +/// calling this function directly. +[[noreturn]] RCC_ABI void +rcc_unreachable_internal (const char *msg = nullptr, const char *file = nullptr, + unsigned line = 0); +} // namespace rcc + +/// Marks that the current location is not supposed to be reachable. +/// In !NDEBUG builds, prints the message and location info to stderr. +/// In NDEBUG builds, if the platform does not support a builtin unreachable +/// then we call an internal LLVM runtime function. Otherwise the behavior is +/// controlled by the CMake flag +/// -DLLVM_UNREACHABLE_OPTIMIZE +/// * When "ON" (default) llvm_unreachable() becomes an optimizer hint +/// that the current location is not supposed to be reachable: the hint +/// turns such code path into undefined behavior. On compilers that don't +/// support such hints, prints a reduced message instead and aborts the +/// program. +/// * When "OFF", a builtin_trap is emitted instead of an +// optimizer hint or printing a reduced message. +/// +/// Use this instead of assert(0). It conveys intent more clearly, suppresses +/// diagnostics for unreachable code paths, and allows compilers to omit +/// unnecessary code. +#ifndef NDEBUG +#define rcc_unreachable(msg) \ + ::rcc::rcc_unreachable_internal (msg, __FILE__, __LINE__) +#elif !defined(RCC_BUILTIN_UNREACHABLE) +#define rcc_unreachable(msg) ::rcc::rcc_unreachable_internal () +#elif RCC_UNREACHABLE_OPTIMIZE +#define rcc_unreachable(msg) RCC_BUILTIN_UNREACHABLE +#else +#define rcc_unreachable(msg) \ + do \ + { \ + RCC_BUILTIN_TRAP; \ + RCC_BUILTIN_UNREACHABLE; \ + } while (false) +#endif + +#endif |