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//===--- CrashRecoveryContext.h - Crash Recovery ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H
#define LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H
#include <string>
namespace llvm {
class StringRef;
/// \brief Crash recovery helper object.
///
/// This class implements support for running operations in a safe context so
/// that crashes (memory errors, stack overflow, assertion violations) can be
/// detected and control restored to the crashing thread. Crash detection is
/// purely "best effort", the exact set of failures which can be recovered from
/// is platform dependent.
///
/// Clients make use of this code by first calling
/// CrashRecoveryContext::Enable(), and then executing unsafe operations via a
/// CrashRecoveryContext object. For example:
///
/// void actual_work(void *);
///
/// void foo() {
/// CrashRecoveryContext CRC;
///
/// if (!CRC.RunSafely(actual_work, 0)) {
/// ... a crash was detected, report error to user ...
/// }
///
/// ... no crash was detected ...
/// }
///
/// Crash recovery contexts may not be nested.
class CrashRecoveryContext {
void *Impl;
public:
CrashRecoveryContext() : Impl(0) {}
~CrashRecoveryContext();
/// \brief Enable crash recovery.
static void Enable();
/// \brief Disable crash recovery.
static void Disable();
/// \brief Return the active context, if the code is currently executing in a
/// thread which is in a protected context.
static CrashRecoveryContext *GetCurrent();
/// \brief Execute the provide callback function (with the given arguments) in
/// a protected context.
///
/// \return True if the function completed successfully, and false if the
/// function crashed (or HandleCrash was called explicitly). Clients should
/// make as little assumptions as possible about the program state when
/// RunSafely has returned false. Clients can use getBacktrace() to retrieve
/// the backtrace of the crash on failures.
bool RunSafely(void (*Fn)(void*), void *UserData);
/// \brief Explicitly trigger a crash recovery in the current process, and
/// return failure from RunSafely(). This function does not return.
void HandleCrash();
/// \brief Return a string containing the backtrace where the crash was
/// detected; or empty if the backtrace wasn't recovered.
///
/// This function is only valid when a crash has been detected (i.e.,
/// RunSafely() has returned false.
const std::string &getBacktrace() const;
};
}
#endif
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