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cb1d6e9690
doesn't return, so just go back to using the old runtime function instead of trying to use abort() when __builtin_unreachable (or an equivalent) isn't supported. llvm-svn: 127629
107 lines
4.5 KiB
C++
107 lines
4.5 KiB
C++
//===- llvm/Support/ErrorHandling.h - Fatal error handling ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an API used to indicate fatal error conditions. Non-fatal
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// errors (most of them) should be handled through LLVMContext.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ERRORHANDLING_H
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#define LLVM_SUPPORT_ERRORHANDLING_H
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#include "llvm/Support/Compiler.h"
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#include "llvm/ADT/StringRef.h"
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#include <string>
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namespace llvm {
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class Twine;
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/// An error handler callback.
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typedef void (*fatal_error_handler_t)(void *user_data,
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const std::string& reason);
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/// install_fatal_error_handler - Installs a new error handler to be used
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/// whenever a serious (non-recoverable) error is encountered by LLVM.
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///
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/// If you are using llvm_start_multithreaded, you should register the handler
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/// before doing that.
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///
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/// If no error handler is installed the default is to print the error message
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/// to stderr, and call exit(1). If an error handler is installed then it is
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/// the handler's responsibility to log the message, it will no longer be
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/// printed to stderr. If the error handler returns, then exit(1) will be
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/// called.
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///
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/// It is dangerous to naively use an error handler which throws an exception.
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/// Even though some applications desire to gracefully recover from arbitrary
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/// faults, blindly throwing exceptions through unfamiliar code isn't a way to
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/// achieve this.
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///
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/// \param user_data - An argument which will be passed to the install error
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/// handler.
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void install_fatal_error_handler(fatal_error_handler_t handler,
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void *user_data = 0);
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/// Restores default error handling behaviour.
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/// This must not be called between llvm_start_multithreaded() and
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/// llvm_stop_multithreaded().
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void remove_fatal_error_handler();
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/// ScopedFatalErrorHandler - This is a simple helper class which just
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/// calls install_fatal_error_handler in its constructor and
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/// remove_fatal_error_handler in its destructor.
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struct ScopedFatalErrorHandler {
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explicit ScopedFatalErrorHandler(fatal_error_handler_t handler,
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void *user_data = 0) {
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install_fatal_error_handler(handler, user_data);
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}
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~ScopedFatalErrorHandler() { remove_fatal_error_handler(); }
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};
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/// Reports a serious error, calling any installed error handler. These
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/// functions are intended to be used for error conditions which are outside
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/// the control of the compiler (I/O errors, invalid user input, etc.)
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///
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/// If no error handler is installed the default is to print the message to
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/// standard error, followed by a newline.
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/// After the error handler is called this function will call exit(1), it
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/// does not return.
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LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const char *reason);
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LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const std::string &reason);
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LLVM_ATTRIBUTE_NORETURN void report_fatal_error(StringRef reason);
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LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const Twine &reason);
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/// This function calls abort(), and prints the optional message to stderr.
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/// Use the llvm_unreachable macro (that adds location info), instead of
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/// calling this function directly.
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LLVM_ATTRIBUTE_NORETURN void llvm_unreachable_internal(const char *msg=0,
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const char *file=0,
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unsigned line=0);
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}
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/// Marks that the current location is not supposed to be reachable.
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/// In !NDEBUG builds, prints the message and location info to stderr.
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/// In NDEBUG builds, becomes an optimizer hint that the current location
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/// is not supposed to be reachable. On compilers that don't support
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/// such hints, prints a reduced message instead.
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///
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/// Use this instead of assert(0). It conveys intent more clearly and
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/// allows compilers to omit some unnecessary code.
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#ifndef NDEBUG
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#define llvm_unreachable(msg) \
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::llvm::llvm_unreachable_internal(msg, __FILE__, __LINE__)
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#elif defined(LLVM_BUILTIN_UNREACHABLE)
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#define llvm_unreachable(msg) LLVM_BUILTIN_UNREACHABLE
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#else
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#define llvm_unreachable(msg) ::llvm::llvm_unreachable_internal()
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#endif
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#endif
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