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// Copyright 2012 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.
#include "src/heap/incremental-marking-job.h"
#include "src/base/platform/time.h"
#include "src/heap/embedder-tracing.h"
#include "src/heap/heap-inl.h"
#include "src/heap/heap.h"
#include "src/heap/incremental-marking.h"
#include "src/isolate.h"
#include "src/v8.h"
#include "src/vm-state-inl.h"
namespace v8 {
namespace internal {
class IncrementalMarkingJob::Task : public CancelableTask {
public:
static StepResult Step(Heap* heap,
EmbedderHeapTracer::EmbedderStackState stack_state);
Task(Isolate* isolate, IncrementalMarkingJob* job,
EmbedderHeapTracer::EmbedderStackState stack_state, TaskType task_type)
: CancelableTask(isolate),
isolate_(isolate),
job_(job),
stack_state_(stack_state),
task_type_(task_type) {}
// CancelableTask overrides.
void RunInternal() override;
Isolate* isolate() const { return isolate_; }
private:
Isolate* const isolate_;
IncrementalMarkingJob* const job_;
const EmbedderHeapTracer::EmbedderStackState stack_state_;
const TaskType task_type_;
};
void IncrementalMarkingJob::Start(Heap* heap) {
DCHECK(!heap->incremental_marking()->IsStopped());
ScheduleTask(heap);
}
void IncrementalMarkingJob::ScheduleTask(Heap* heap, TaskType task_type) {
if (!IsTaskPending(task_type) && !heap->IsTearingDown()) {
v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(heap->isolate());
SetTaskPending(task_type, true);
auto taskrunner =
V8::GetCurrentPlatform()->GetForegroundTaskRunner(isolate);
if (task_type == TaskType::kNormal) {
if (taskrunner->NonNestableTasksEnabled()) {
taskrunner->PostNonNestableTask(base::make_unique<Task>(
heap->isolate(), this,
EmbedderHeapTracer::EmbedderStackState::kEmpty, task_type));
} else {
taskrunner->PostTask(base::make_unique<Task>(
heap->isolate(), this,
EmbedderHeapTracer::EmbedderStackState::kUnknown, task_type));
}
} else {
if (taskrunner->NonNestableDelayedTasksEnabled()) {
taskrunner->PostNonNestableDelayedTask(
base::make_unique<Task>(
heap->isolate(), this,
EmbedderHeapTracer::EmbedderStackState::kEmpty, task_type),
kDelayInSeconds);
} else {
taskrunner->PostDelayedTask(
base::make_unique<Task>(
heap->isolate(), this,
EmbedderHeapTracer::EmbedderStackState::kUnknown, task_type),
kDelayInSeconds);
}
}
}
}
StepResult IncrementalMarkingJob::Task::Step(
Heap* heap, EmbedderHeapTracer::EmbedderStackState stack_state) {
const int kIncrementalMarkingDelayMs = 1;
double deadline =
heap->MonotonicallyIncreasingTimeInMs() + kIncrementalMarkingDelayMs;
StepResult result = heap->incremental_marking()->AdvanceWithDeadline(
deadline, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD,
i::StepOrigin::kTask);
{
EmbedderStackStateScope scope(heap->local_embedder_heap_tracer(),
stack_state);
heap->FinalizeIncrementalMarkingIfComplete(
GarbageCollectionReason::kFinalizeMarkingViaTask);
}
return result;
}
void IncrementalMarkingJob::Task::RunInternal() {
VMState<GC> state(isolate());
TRACE_EVENT_CALL_STATS_SCOPED(isolate(), "v8", "V8.Task");
Heap* heap = isolate()->heap();
IncrementalMarking* incremental_marking = heap->incremental_marking();
if (incremental_marking->IsStopped()) {
if (heap->IncrementalMarkingLimitReached() !=
Heap::IncrementalMarkingLimit::kNoLimit) {
heap->StartIncrementalMarking(heap->GCFlagsForIncrementalMarking(),
GarbageCollectionReason::kIdleTask,
kGCCallbackScheduleIdleGarbageCollection);
}
}
// Clear this flag after StartIncrementalMarking call to avoid
// scheduling a new task when startining incremental marking.
job_->SetTaskPending(task_type_, false);
if (!incremental_marking->IsStopped()) {
StepResult step_result = Step(heap, stack_state_);
if (!incremental_marking->IsStopped()) {
job_->ScheduleTask(heap, step_result == StepResult::kNoImmediateWork
? TaskType::kDelayed
: TaskType::kNormal);
}
}
}
} // namespace internal
} // namespace v8
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