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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"
#include "src/heap/gc-tracer.h"
#include "src/objects/embedder-data-slot.h"
#include "src/objects/js-objects-inl.h"
namespace v8 {
namespace internal {
void LocalEmbedderHeapTracer::SetRemoteTracer(EmbedderHeapTracer* tracer) {
if (remote_tracer_) remote_tracer_->isolate_ = nullptr;
remote_tracer_ = tracer;
if (remote_tracer_)
remote_tracer_->isolate_ = reinterpret_cast<v8::Isolate*>(isolate_);
}
void LocalEmbedderHeapTracer::TracePrologue(
EmbedderHeapTracer::TraceFlags flags) {
if (!InUse()) return;
embedder_worklist_empty_ = false;
remote_tracer_->TracePrologue(flags);
}
void LocalEmbedderHeapTracer::TraceEpilogue() {
if (!InUse()) return;
EmbedderHeapTracer::TraceSummary summary;
remote_tracer_->TraceEpilogue(&summary);
remote_stats_.used_size = summary.allocated_size;
// Force a check next time increased memory is reported. This allows for
// setting limits close to actual heap sizes.
remote_stats_.allocated_size_limit_for_check = 0;
constexpr double kMinReportingTimeMs = 0.5;
if (summary.time > kMinReportingTimeMs) {
isolate_->heap()->tracer()->RecordEmbedderSpeed(summary.allocated_size,
summary.time);
}
}
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::EmbedderStackState::kMayContainHeapPointers;
}
bool LocalEmbedderHeapTracer::Trace(double deadline) {
if (!InUse()) return true;
return remote_tracer_->AdvanceTracing(deadline);
}
bool LocalEmbedderHeapTracer::IsRemoteTracingDone() {
return !InUse() || remote_tracer_->IsTracingDone();
}
void LocalEmbedderHeapTracer::SetEmbedderStackStateForNextFinalization(
EmbedderHeapTracer::EmbedderStackState stack_state) {
if (!InUse()) return;
embedder_stack_state_ = stack_state;
if (EmbedderHeapTracer::EmbedderStackState::kNoHeapPointers == stack_state) {
remote_tracer()->NotifyEmptyEmbedderStack();
}
}
LocalEmbedderHeapTracer::ProcessingScope::ProcessingScope(
LocalEmbedderHeapTracer* tracer)
: tracer_(tracer) {
wrapper_cache_.reserve(kWrapperCacheSize);
}
LocalEmbedderHeapTracer::ProcessingScope::~ProcessingScope() {
if (!wrapper_cache_.empty()) {
tracer_->remote_tracer()->RegisterV8References(std::move(wrapper_cache_));
}
}
void LocalEmbedderHeapTracer::ProcessingScope::TracePossibleWrapper(
JSObject js_object) {
DCHECK(js_object.IsApiWrapper());
if (js_object.GetEmbedderFieldCount() < 2) return;
void* pointer0;
void* pointer1;
if (EmbedderDataSlot(js_object, 0)
.ToAlignedPointer(tracer_->isolate_, &pointer0) &&
pointer0 &&
EmbedderDataSlot(js_object, 1)
.ToAlignedPointer(tracer_->isolate_, &pointer1)) {
wrapper_cache_.push_back({pointer0, pointer1});
}
FlushWrapperCacheIfFull();
}
void LocalEmbedderHeapTracer::ProcessingScope::FlushWrapperCacheIfFull() {
if (wrapper_cache_.size() == wrapper_cache_.capacity()) {
tracer_->remote_tracer()->RegisterV8References(std::move(wrapper_cache_));
wrapper_cache_.clear();
wrapper_cache_.reserve(kWrapperCacheSize);
}
}
void LocalEmbedderHeapTracer::ProcessingScope::AddWrapperInfoForTesting(
WrapperInfo info) {
wrapper_cache_.push_back(info);
FlushWrapperCacheIfFull();
}
void LocalEmbedderHeapTracer::StartIncrementalMarkingIfNeeded() {
if (!FLAG_global_gc_scheduling || !FLAG_incremental_marking) return;
Heap* heap = isolate_->heap();
heap->StartIncrementalMarkingIfAllocationLimitIsReached(
heap->GCFlagsForIncrementalMarking(),
kGCCallbackScheduleIdleGarbageCollection);
if (heap->AllocationLimitOvershotByLargeMargin()) {
heap->FinalizeIncrementalMarkingAtomically(
i::GarbageCollectionReason::kExternalFinalize);
}
}
} // namespace internal
} // namespace v8
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