// 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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#include "src/heap/embedder-tracing.h"
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#include "src/base/logging.h"
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namespace v8 {
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namespace internal {
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void LocalEmbedderHeapTracer::TracePrologue() {
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if (!InUse()) return;
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CHECK(cached_wrappers_to_trace_.empty());
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num_v8_marking_worklist_was_empty_ = 0;
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remote_tracer_->TracePrologue();
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}
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void LocalEmbedderHeapTracer::TraceEpilogue() {
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if (!InUse()) return;
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CHECK(cached_wrappers_to_trace_.empty());
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remote_tracer_->TraceEpilogue();
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}
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void LocalEmbedderHeapTracer::AbortTracing() {
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if (!InUse()) return;
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cached_wrappers_to_trace_.clear();
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remote_tracer_->AbortTracing();
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}
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void LocalEmbedderHeapTracer::EnterFinalPause() {
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if (!InUse()) return;
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remote_tracer_->EnterFinalPause(embedder_stack_state_);
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// Resetting to state unknown as there may be follow up garbage collections
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// triggered from callbacks that have a different stack state.
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embedder_stack_state_ = EmbedderHeapTracer::kUnknown;
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}
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bool LocalEmbedderHeapTracer::Trace(double deadline) {
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if (!InUse()) return true;
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DCHECK_EQ(0, NumberOfCachedWrappersToTrace());
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return remote_tracer_->AdvanceTracing(deadline);
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}
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bool LocalEmbedderHeapTracer::IsRemoteTracingDone() {
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return (InUse()) ? cached_wrappers_to_trace_.empty() &&
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remote_tracer_->IsTracingDone()
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: true;
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}
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void LocalEmbedderHeapTracer::RegisterWrappersWithRemoteTracer() {
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if (!InUse()) return;
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if (cached_wrappers_to_trace_.empty()) {
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return;
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}
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remote_tracer_->RegisterV8References(cached_wrappers_to_trace_);
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cached_wrappers_to_trace_.clear();
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}
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bool LocalEmbedderHeapTracer::RequiresImmediateWrapperProcessing() {
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const size_t kTooManyWrappers = 16000;
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return cached_wrappers_to_trace_.size() > kTooManyWrappers;
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}
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void LocalEmbedderHeapTracer::SetEmbedderStackStateForNextFinalization(
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EmbedderHeapTracer::EmbedderStackState stack_state) {
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if (!InUse()) return;
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embedder_stack_state_ = stack_state;
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}
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} // namespace internal
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} // namespace v8
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