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// Copyright 2016 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_EMBEDDER_TRACING_H_
#define V8_HEAP_EMBEDDER_TRACING_H_
#include "include/v8.h"
#include "src/flags.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
class Heap;
class V8_EXPORT_PRIVATE LocalEmbedderHeapTracer final {
public:
typedef std::pair<void*, void*> WrapperInfo;
explicit LocalEmbedderHeapTracer(Isolate* isolate)
: isolate_(isolate),
remote_tracer_(nullptr),
num_v8_marking_worklist_was_empty_(0) {}
~LocalEmbedderHeapTracer() {
if (remote_tracer_) remote_tracer_->isolate_ = nullptr;
}
void SetRemoteTracer(EmbedderHeapTracer* tracer) {
if (remote_tracer_) remote_tracer_->isolate_ = nullptr;
remote_tracer_ = tracer;
if (remote_tracer_)
remote_tracer_->isolate_ = reinterpret_cast<v8::Isolate*>(isolate_);
}
bool InUse() { return remote_tracer_ != nullptr; }
void TracePrologue();
void TraceEpilogue();
void AbortTracing();
void EnterFinalPause();
bool Trace(double deadline,
EmbedderHeapTracer::AdvanceTracingActions actions);
bool IsRemoteTracingDone();
size_t NumberOfCachedWrappersToTrace() {
return cached_wrappers_to_trace_.size();
}
void AddWrapperToTrace(WrapperInfo entry) {
cached_wrappers_to_trace_.push_back(entry);
}
void ClearCachedWrappersToTrace() { cached_wrappers_to_trace_.clear(); }
void RegisterWrappersWithRemoteTracer();
// In order to avoid running out of memory we force tracing wrappers if there
// are too many of them.
bool RequiresImmediateWrapperProcessing();
void NotifyV8MarkingWorklistWasEmpty() {
num_v8_marking_worklist_was_empty_++;
}
bool ShouldFinalizeIncrementalMarking() {
static const size_t kMaxIncrementalFixpointRounds = 3;
return !FLAG_incremental_marking_wrappers || !InUse() ||
IsRemoteTracingDone() ||
num_v8_marking_worklist_was_empty_ > kMaxIncrementalFixpointRounds;
}
private:
typedef std::vector<WrapperInfo> WrapperCache;
Isolate* const isolate_;
EmbedderHeapTracer* remote_tracer_;
WrapperCache cached_wrappers_to_trace_;
size_t num_v8_marking_worklist_was_empty_;
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_EMBEDDER_TRACING_H_