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//===-- sanitizer_stoptheworld.h --------------------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// Defines the StopTheWorld function which suspends the execution of the current
// process and runs the user-supplied callback in the same address space.
//
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_STOPTHEWORLD_H
#define SANITIZER_STOPTHEWORLD_H
#include "sanitizer_internal_defs.h"
#include "sanitizer_common.h"
namespace __sanitizer {
enum PtraceRegistersStatus {
REGISTERS_UNAVAILABLE_FATAL = -1,
REGISTERS_UNAVAILABLE = 0,
REGISTERS_AVAILABLE = 1
};
// Holds the list of suspended threads and provides an interface to dump their
// register contexts.
class SuspendedThreadsList {
public:
SuspendedThreadsList() = default;
// Can't declare pure virtual functions in sanitizer runtimes:
// __cxa_pure_virtual might be unavailable. Use UNIMPLEMENTED() instead.
virtual PtraceRegistersStatus GetRegistersAndSP(uptr index, uptr *buffer,
uptr *sp) const {
UNIMPLEMENTED();
}
// The buffer in GetRegistersAndSP should be at least this big.
virtual uptr RegisterCount() const { UNIMPLEMENTED(); }
virtual uptr ThreadCount() const { UNIMPLEMENTED(); }
virtual tid_t GetThreadID(uptr index) const { UNIMPLEMENTED(); }
private:
// Prohibit copy and assign.
SuspendedThreadsList(const SuspendedThreadsList&);
void operator=(const SuspendedThreadsList&);
};
typedef void (*StopTheWorldCallback)(
const SuspendedThreadsList &suspended_threads_list,
void *argument);
// Suspend all threads in the current process and run the callback on the list
// of suspended threads. This function will resume the threads before returning.
// The callback should not call any libc functions. The callback must not call
// exit() nor _exit() and instead return to the caller.
// This function should NOT be called from multiple threads simultaneously.
void StopTheWorld(StopTheWorldCallback callback, void *argument);
} // namespace __sanitizer
#endif // SANITIZER_STOPTHEWORLD_H
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