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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 "include/v8-cppgc.h"
#include "src/base/logging.h"
#include "src/handles/global-handles.h"
#include "src/heap/embedder-tracing-inl.h"
#include "src/heap/gc-tracer.h"
#include "src/heap/marking-worklist-inl.h"
namespace v8::internal {
START_ALLOW_USE_DEPRECATED()
void LocalEmbedderHeapTracer::SetRemoteTracer(EmbedderHeapTracer* tracer) {
CHECK_NULL(cpp_heap_);
if (remote_tracer_) remote_tracer_->v8_isolate_ = nullptr;
remote_tracer_ = tracer;
default_embedder_roots_handler_.SetTracer(tracer);
if (remote_tracer_)
remote_tracer_->v8_isolate_ = reinterpret_cast<v8::Isolate*>(isolate_);
}
void LocalEmbedderHeapTracer::SetCppHeap(CppHeap* cpp_heap) {
CHECK_NULL(remote_tracer_);
cpp_heap_ = cpp_heap;
}
namespace {
CppHeap::GarbageCollectionFlags ConvertTraceFlags(
EmbedderHeapTracer::TraceFlags flags) {
CppHeap::GarbageCollectionFlags result;
if (flags & EmbedderHeapTracer::TraceFlags::kForced)
result |= CppHeap::GarbageCollectionFlagValues::kForced;
if (flags & EmbedderHeapTracer::TraceFlags::kReduceMemory)
result |= CppHeap::GarbageCollectionFlagValues::kReduceMemory;
return result;
}
} // namespace
void LocalEmbedderHeapTracer::PrepareForTrace(
EmbedderHeapTracer::TraceFlags flags) {
if (cpp_heap_)
cpp_heap()->InitializeTracing(cppgc::internal::CollectionType::kMajor,
ConvertTraceFlags(flags));
}
void LocalEmbedderHeapTracer::TracePrologue(
EmbedderHeapTracer::TraceFlags flags) {
if (!InUse()) return;
embedder_worklist_empty_ = false;
if (cpp_heap_)
cpp_heap()->StartTracing();
else
remote_tracer_->TracePrologue(flags);
}
void LocalEmbedderHeapTracer::TraceEpilogue() {
if (!InUse()) return;
// 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;
if (cpp_heap_) {
cpp_heap()->TraceEpilogue();
} else {
EmbedderHeapTracer::TraceSummary summary;
remote_tracer_->TraceEpilogue(&summary);
UpdateRemoteStats(summary.allocated_size, summary.time);
}
}
void LocalEmbedderHeapTracer::UpdateRemoteStats(size_t allocated_size,
double time) {
remote_stats_.used_size = 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 (time > kMinReportingTimeMs) {
isolate_->heap()->tracer()->RecordEmbedderSpeed(allocated_size, time);
}
}
void LocalEmbedderHeapTracer::EnterFinalPause() {
if (!InUse()) return;
if (cpp_heap_)
cpp_heap()->EnterFinalPause(embedder_stack_state_);
else
remote_tracer_->EnterFinalPause(embedder_stack_state_);
}
bool LocalEmbedderHeapTracer::Trace(double max_duration) {
if (!InUse()) return true;
return cpp_heap_ ? cpp_heap_->AdvanceTracing(max_duration)
: remote_tracer_->AdvanceTracing(max_duration);
}
bool LocalEmbedderHeapTracer::IsRemoteTracingDone() {
return !InUse() || (cpp_heap_ ? cpp_heap()->IsTracingDone()
: remote_tracer_->IsTracingDone());
}
LocalEmbedderHeapTracer::ProcessingScope::ProcessingScope(
LocalEmbedderHeapTracer* tracer)
: tracer_(tracer), wrapper_descriptor_(tracer->wrapper_descriptor_) {
DCHECK(!tracer_->cpp_heap_);
wrapper_cache_.reserve(kWrapperCacheSize);
}
LocalEmbedderHeapTracer::ProcessingScope::~ProcessingScope() {
DCHECK(!tracer_->cpp_heap_);
if (!wrapper_cache_.empty()) {
tracer_->remote_tracer_->RegisterV8References(std::move(wrapper_cache_));
}
}
LocalEmbedderHeapTracer::WrapperInfo
LocalEmbedderHeapTracer::ExtractWrapperInfo(Isolate* isolate,
JSObject js_object) {
WrapperInfo info;
if (ExtractWrappableInfo(isolate, js_object, wrapper_descriptor(), &info)) {
return info;
}
return {nullptr, nullptr};
}
void LocalEmbedderHeapTracer::ProcessingScope::TracePossibleWrapper(
JSObject js_object) {
DCHECK(js_object.MayHaveEmbedderFields());
WrapperInfo info;
if (ExtractWrappableInfo(tracer_->isolate_, js_object, wrapper_descriptor_,
&info)) {
wrapper_cache_.push_back(std::move(info));
FlushWrapperCacheIfFull();
}
}
void LocalEmbedderHeapTracer::ProcessingScope::FlushWrapperCacheIfFull() {
DCHECK(!tracer_->cpp_heap_);
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 (!v8_flags.global_gc_scheduling || !v8_flags.incremental_marking) return;
Heap* heap = isolate_->heap();
heap->StartIncrementalMarkingIfAllocationLimitIsReached(
heap->GCFlagsForIncrementalMarking(),
kGCCallbackScheduleIdleGarbageCollection);
if (heap->AllocationLimitOvershotByLargeMargin()) {
heap->FinalizeIncrementalMarkingAtomically(
i::GarbageCollectionReason::kExternalFinalize);
}
}
void LocalEmbedderHeapTracer::EmbedderWriteBarrier(Heap* heap,
JSObject js_object) {
DCHECK(InUse());
DCHECK(js_object.MayHaveEmbedderFields());
if (cpp_heap_) {
DCHECK_NOT_NULL(heap->mark_compact_collector());
const EmbedderDataSlot type_slot(js_object,
wrapper_descriptor_.wrappable_type_index);
const EmbedderDataSlot instance_slot(
js_object, wrapper_descriptor_.wrappable_instance_index);
heap->mark_compact_collector()
->local_marking_worklists()
->cpp_marking_state()
->MarkAndPush(type_slot, instance_slot);
return;
}
LocalEmbedderHeapTracer::ProcessingScope scope(this);
scope.TracePossibleWrapper(js_object);
}
bool DefaultEmbedderRootsHandler::IsRoot(
const v8::TracedReference<v8::Value>& handle) {
return !tracer_ || tracer_->IsRootForNonTracingGC(handle);
}
void DefaultEmbedderRootsHandler::ResetRoot(
const v8::TracedReference<v8::Value>& handle) {
// Resetting is only called when IsRoot() returns false which
// can only happen the EmbedderHeapTracer is set on API level.
DCHECK(tracer_);
tracer_->ResetHandleInNonTracingGC(handle);
}
END_ALLOW_USE_DEPRECATED()
} // namespace v8::internal
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