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// Copyright 2015 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/context-measure.h"
#include "src/base/logging.h"
#include "src/contexts.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
ContextMeasure::ContextMeasure(Context* context)
: context_(context),
root_index_map_(context->GetIsolate()),
recursion_depth_(0),
count_(0),
size_(0) {
DCHECK(context_->IsNativeContext());
Object* next_link = context_->next_context_link();
MeasureObject(context_);
MeasureDeferredObjects();
context_->set(Context::NEXT_CONTEXT_LINK, next_link);
}
bool ContextMeasure::IsShared(HeapObject* object) {
if (object->IsScript()) return true;
if (object->IsSharedFunctionInfo()) return true;
if (object->IsScopeInfo()) return true;
if (object->IsCode() && !Code::cast(object)->is_optimized_code()) return true;
if (object->IsAccessorInfo()) return true;
if (object->IsWeakCell()) return true;
return false;
}
void ContextMeasure::MeasureObject(HeapObject* object) {
if (reference_map_.Lookup(object).is_valid()) return;
if (root_index_map_.Lookup(object) != RootIndexMap::kInvalidRootIndex) return;
if (IsShared(object)) return;
reference_map_.Add(object, SerializerReference::DummyReference());
recursion_depth_++;
if (recursion_depth_ > kMaxRecursion) {
deferred_objects_.Add(object);
} else {
MeasureAndRecurse(object);
}
recursion_depth_--;
}
void ContextMeasure::MeasureDeferredObjects() {
while (deferred_objects_.length() > 0) {
MeasureAndRecurse(deferred_objects_.RemoveLast());
}
}
void ContextMeasure::MeasureAndRecurse(HeapObject* object) {
int size = object->Size();
count_++;
size_ += size;
Map* map = object->map();
MeasureObject(map);
object->IterateBody(map->instance_type(), size, this);
}
void ContextMeasure::VisitPointers(Object** start, Object** end) {
for (Object** current = start; current < end; current++) {
if ((*current)->IsSmi()) continue;
MeasureObject(HeapObject::cast(*current));
}
}
} // namespace internal
} // namespace v8
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