mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
102 lines
4.2 KiB
C++
102 lines
4.2 KiB
C++
//===- llvm/Support/ErrorHandling.h - Fatal error handling ------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines an API used to indicate fatal error conditions. Non-fatal
|
|
// errors (most of them) should be handled through LLVMContext.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SUPPORT_ERRORHANDLING_H
|
|
#define LLVM_SUPPORT_ERRORHANDLING_H
|
|
|
|
#include "llvm/Support/Compiler.h"
|
|
#include <string>
|
|
|
|
namespace llvm {
|
|
class Twine;
|
|
|
|
/// An error handler callback.
|
|
typedef void (*fatal_error_handler_t)(void *user_data,
|
|
const std::string& reason);
|
|
|
|
/// install_fatal_error_handler - Installs a new error handler to be used
|
|
/// whenever a serious (non-recoverable) error is encountered by LLVM.
|
|
///
|
|
/// If you are using llvm_start_multithreaded, you should register the handler
|
|
/// before doing that.
|
|
///
|
|
/// 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.
|
|
void install_fatal_error_handler(fatal_error_handler_t handler,
|
|
void *user_data = 0);
|
|
|
|
/// Restores default error handling behaviour.
|
|
/// This must not be called between llvm_start_multithreaded() and
|
|
/// llvm_stop_multithreaded().
|
|
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 = 0) {
|
|
install_fatal_error_handler(handler, user_data);
|
|
}
|
|
|
|
~ScopedFatalErrorHandler() { remove_fatal_error_handler(); }
|
|
};
|
|
|
|
/// Reports a serious error, calling any installed error handler. These
|
|
/// functions are intended to be used for error conditions which are outside
|
|
/// the control of the compiler (I/O errors, invalid user input, etc.)
|
|
///
|
|
/// If no error handler is installed the default is to print the message to
|
|
/// standard error, followed by a newline.
|
|
/// After the error handler is called this function will call exit(1), it
|
|
/// does not return.
|
|
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const char *reason);
|
|
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const std::string &reason);
|
|
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const Twine &reason);
|
|
|
|
/// 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.
|
|
LLVM_ATTRIBUTE_NORETURN void llvm_unreachable_internal(const char *msg=0,
|
|
const char *file=0,
|
|
unsigned line=0);
|
|
}
|
|
|
|
/// Prints the message and location info to stderr in !NDEBUG builds.
|
|
/// This is intended to be used for "impossible" situations that imply
|
|
/// a bug in the compiler.
|
|
///
|
|
/// In NDEBUG mode it only prints "UNREACHABLE executed".
|
|
/// Use this instead of assert(0), so that the compiler knows this path
|
|
/// is not reachable even for NDEBUG builds.
|
|
#ifndef NDEBUG
|
|
#define llvm_unreachable(msg) \
|
|
::llvm::llvm_unreachable_internal(msg, __FILE__, __LINE__)
|
|
#else
|
|
#define llvm_unreachable(msg) ::llvm::llvm_unreachable_internal()
|
|
#endif
|
|
|
|
#endif
|