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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_HEAP_CONCURRENT_MARKING_H_
#define V8_HEAP_CONCURRENT_MARKING_H_
#include <memory>
#include "include/v8-platform.h"
#include "src/base/atomic-utils.h"
#include "src/base/platform/condition-variable.h"
#include "src/base/platform/mutex.h"
#include "src/heap/marking-visitor.h"
#include "src/heap/marking-worklist.h"
#include "src/heap/memory-measurement.h"
#include "src/heap/slot-set.h"
#include "src/heap/spaces.h"
#include "src/heap/worklist.h"
#include "src/init/v8.h"
#include "src/tasks/cancelable-task.h"
#include "src/utils/allocation.h"
#include "src/utils/utils.h"
namespace v8 {
namespace internal {
class Heap;
class Isolate;
class MajorNonAtomicMarkingState;
class MemoryChunk;
class WeakObjects;
struct MemoryChunkData {
intptr_t live_bytes;
std::unique_ptr<TypedSlots> typed_slots;
};
using MemoryChunkDataMap =
std::unordered_map<MemoryChunk*, MemoryChunkData, MemoryChunk::Hasher>;
class V8_EXPORT_PRIVATE ConcurrentMarking {
public:
// When the scope is entered, the concurrent marking tasks
// are preempted and are not looking at the heap objects, concurrent marking
// is resumed when the scope is exited.
class V8_NODISCARD PauseScope {
public:
explicit PauseScope(ConcurrentMarking* concurrent_marking);
~PauseScope();
private:
ConcurrentMarking* const concurrent_marking_;
const bool resume_on_exit_;
};
// TODO(gab): The only thing that prevents this being above 7 is
// Worklist::kMaxNumTasks being maxed at 8 (concurrent marking doesn't use
// task 0, reserved for the main thread).
static constexpr int kMaxTasks = 7;
ConcurrentMarking(Heap* heap, MarkingWorklists* marking_worklists,
WeakObjects* weak_objects);
// Schedules asynchronous job to perform concurrent marking at |priority|.
// Objects in the heap should not be moved while these are active (can be
// stopped safely via Stop() or PauseScope).
void ScheduleJob(TaskPriority priority = TaskPriority::kUserVisible);
// Waits for scheduled job to complete.
void Join();
// Preempts ongoing job ASAP. Returns true if concurrent marking was in
// progress, false otherwise.
bool Pause();
// Schedules asynchronous job to perform concurrent marking at |priority| if
// not already running, otherwise adjusts the number of workers running job
// and the priority if diffrent from the default kUserVisible.
void RescheduleJobIfNeeded(
TaskPriority priority = TaskPriority::kUserVisible);
// Flushes native context sizes to the given table of the main thread.
void FlushNativeContexts(NativeContextStats* main_stats);
// Flushes memory chunk data using the given marking state.
void FlushMemoryChunkData(MajorNonAtomicMarkingState* marking_state);
// This function is called for a new space page that was cleared after
// scavenge and is going to be re-used.
void ClearMemoryChunkData(MemoryChunk* chunk);
// Checks if all threads are stopped.
bool IsStopped();
size_t TotalMarkedBytes();
void set_another_ephemeron_iteration(bool another_ephemeron_iteration) {
another_ephemeron_iteration_.store(another_ephemeron_iteration);
}
bool another_ephemeron_iteration() {
return another_ephemeron_iteration_.load();
}
private:
struct TaskState {
size_t marked_bytes = 0;
MemoryChunkDataMap memory_chunk_data;
NativeContextInferrer native_context_inferrer;
NativeContextStats native_context_stats;
char cache_line_padding[64];
};
class JobTask;
void Run(JobDelegate* delegate, base::EnumSet<CodeFlushMode> code_flush_mode,
unsigned mark_compact_epoch, bool is_forced_gc);
size_t GetMaxConcurrency(size_t worker_count);
std::unique_ptr<JobHandle> job_handle_;
Heap* const heap_;
MarkingWorklists* const marking_worklists_;
WeakObjects* const weak_objects_;
TaskState task_state_[kMaxTasks + 1];
std::atomic<size_t> total_marked_bytes_{0};
std::atomic<bool> another_ephemeron_iteration_{false};
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_CONCURRENT_MARKING_H_
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