// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_HEAP_EMBEDDER_TRACING_H_
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#define V8_HEAP_EMBEDDER_TRACING_H_
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#include "include/v8.h"
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#include "src/flags.h"
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#include "src/globals.h"
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namespace v8 {
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namespace internal {
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class Heap;
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class V8_EXPORT_PRIVATE LocalEmbedderHeapTracer final {
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public:
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typedef std::pair<void*, void*> WrapperInfo;
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explicit LocalEmbedderHeapTracer(Isolate* isolate) : isolate_(isolate) {}
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~LocalEmbedderHeapTracer() {
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if (remote_tracer_) remote_tracer_->isolate_ = nullptr;
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}
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void SetRemoteTracer(EmbedderHeapTracer* tracer) {
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if (remote_tracer_) remote_tracer_->isolate_ = nullptr;
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remote_tracer_ = tracer;
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if (remote_tracer_)
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remote_tracer_->isolate_ = reinterpret_cast<v8::Isolate*>(isolate_);
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}
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bool InUse() const { return remote_tracer_ != nullptr; }
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void TracePrologue();
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void TraceEpilogue();
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void AbortTracing();
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void EnterFinalPause();
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bool Trace(double deadline);
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bool IsRemoteTracingDone();
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size_t NumberOfCachedWrappersToTrace() {
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return cached_wrappers_to_trace_.size();
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}
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void AddWrapperToTrace(WrapperInfo entry) {
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cached_wrappers_to_trace_.push_back(entry);
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}
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void ClearCachedWrappersToTrace() { cached_wrappers_to_trace_.clear(); }
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void RegisterWrappersWithRemoteTracer();
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// In order to avoid running out of memory we force tracing wrappers if there
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// are too many of them.
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bool RequiresImmediateWrapperProcessing();
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void NotifyV8MarkingWorklistWasEmpty() {
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num_v8_marking_worklist_was_empty_++;
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}
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bool ShouldFinalizeIncrementalMarking() {
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static const size_t kMaxIncrementalFixpointRounds = 3;
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return !FLAG_incremental_marking_wrappers || !InUse() ||
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IsRemoteTracingDone() ||
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num_v8_marking_worklist_was_empty_ > kMaxIncrementalFixpointRounds;
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}
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void SetEmbedderStackStateForNextFinalization(
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EmbedderHeapTracer::EmbedderStackState stack_state);
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private:
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typedef std::vector<WrapperInfo> WrapperCache;
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Isolate* const isolate_;
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WrapperCache cached_wrappers_to_trace_;
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EmbedderHeapTracer* remote_tracer_ = nullptr;
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size_t num_v8_marking_worklist_was_empty_ = 0;
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EmbedderHeapTracer::EmbedderStackState embedder_stack_state_ =
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EmbedderHeapTracer::kUnknown;
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friend class EmbedderStackStateScope;
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_HEAP_EMBEDDER_TRACING_H_
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