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