mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-30 22:54:35 +03:00
4314c25cf2
All users which relied on the default constructor use a None lock rank for now. This will make it easier to in the future remove LockRank and actually annotate the ranks by searching for None.
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
|
|
* Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Locking/Spinlock.h>
|
|
#include <Kernel/Memory/AnonymousVMObject.h>
|
|
|
|
namespace Kernel {
|
|
|
|
// Note: These need to be kept in sync with Userland/Libraries/LibC/sys/kcov.h
|
|
typedef volatile u64 kcov_pc_t;
|
|
#define KCOV_ENTRY_SIZE sizeof(kcov_pc_t)
|
|
#define KCOV_MAX_ENTRIES (10 * 1024 * 1024)
|
|
|
|
/*
|
|
* One KCOVInstance is allocated per process, when the process opens /dev/kcov
|
|
* for the first time. At this point it is in state OPENED. When a thread in
|
|
* the same process then uses the KCOV_ENABLE ioctl on the block device, the
|
|
* instance enters state TRACING.
|
|
*
|
|
* A KCOVInstance in state TRACING can return to state OPENED by either the
|
|
* KCOV_DISABLE ioctl or by killing the thread. A KCOVInstance in state OPENED
|
|
* can return to state UNUSED only when the process dies. At this point
|
|
* KCOVDevice::free_process will delete the KCOVInstance.
|
|
*/
|
|
class KCOVInstance final {
|
|
public:
|
|
explicit KCOVInstance(ProcessID pid);
|
|
|
|
ErrorOr<void> buffer_allocate(size_t buffer_size_in_entries);
|
|
bool has_buffer() const { return m_buffer != nullptr; }
|
|
void buffer_add_pc(u64 pc);
|
|
|
|
enum State {
|
|
UNUSED = 0,
|
|
OPENED = 1,
|
|
TRACING = 2,
|
|
} m_state { UNUSED };
|
|
|
|
State state() const { return m_state; }
|
|
void set_state(State state) { m_state = state; }
|
|
|
|
Memory::VMObject* vmobject() { return m_vmobject; }
|
|
|
|
Spinlock& spinlock() { return m_lock; }
|
|
|
|
private:
|
|
ProcessID m_pid { 0 };
|
|
u64 m_buffer_size_in_entries { 0 };
|
|
size_t m_buffer_size_in_bytes { 0 };
|
|
kcov_pc_t* m_buffer { nullptr };
|
|
RefPtr<Memory::AnonymousVMObject> m_vmobject;
|
|
|
|
// Here to ensure it's not garbage collected at the end of open()
|
|
OwnPtr<Memory::Region> m_kernel_region;
|
|
|
|
Spinlock m_lock { LockRank::None };
|
|
};
|
|
|
|
}
|