1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/heap/embedder-tracing.h" 6 7 #include "src/base/logging.h" 8 9 namespace v8 { 10 namespace internal { 11 12 void LocalEmbedderHeapTracer::TracePrologue() { 13 if (!InUse()) return; 14 15 CHECK(cached_wrappers_to_trace_.empty()); 16 num_v8_marking_deque_was_empty_ = 0; 17 remote_tracer_->TracePrologue(); 18 } 19 20 void LocalEmbedderHeapTracer::TraceEpilogue() { 21 if (!InUse()) return; 22 23 CHECK(cached_wrappers_to_trace_.empty()); 24 remote_tracer_->TraceEpilogue(); 25 } 26 27 void LocalEmbedderHeapTracer::AbortTracing() { 28 if (!InUse()) return; 29 30 cached_wrappers_to_trace_.clear(); 31 remote_tracer_->AbortTracing(); 32 } 33 34 void LocalEmbedderHeapTracer::EnterFinalPause() { 35 if (!InUse()) return; 36 37 remote_tracer_->EnterFinalPause(); 38 } 39 40 bool LocalEmbedderHeapTracer::Trace( 41 double deadline, EmbedderHeapTracer::AdvanceTracingActions actions) { 42 if (!InUse()) return false; 43 44 DCHECK_EQ(0, NumberOfCachedWrappersToTrace()); 45 return remote_tracer_->AdvanceTracing(deadline, actions); 46 } 47 48 size_t LocalEmbedderHeapTracer::NumberOfWrappersToTrace() { 49 return (InUse()) 50 ? cached_wrappers_to_trace_.size() + 51 remote_tracer_->NumberOfWrappersToTrace() 52 : 0; 53 } 54 55 void LocalEmbedderHeapTracer::RegisterWrappersWithRemoteTracer() { 56 if (!InUse()) return; 57 58 if (cached_wrappers_to_trace_.empty()) { 59 return; 60 } 61 62 remote_tracer_->RegisterV8References(cached_wrappers_to_trace_); 63 cached_wrappers_to_trace_.clear(); 64 } 65 66 bool LocalEmbedderHeapTracer::RequiresImmediateWrapperProcessing() { 67 const size_t kTooManyWrappers = 16000; 68 return cached_wrappers_to_trace_.size() > kTooManyWrappers; 69 } 70 71 } // namespace internal 72 } // namespace v8 73
