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// Copyright 2021 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/profiler/weak-code-registry.h"
#include "src/handles/global-handles.h"
#include "src/objects/instance-type-inl.h"
namespace v8 {
namespace internal {
namespace {
void Untrack(CodeEntry* entry) {
if (Address** heap_object_location_address =
entry->heap_object_location_address()) {
GlobalHandles::Destroy(*heap_object_location_address);
*heap_object_location_address = nullptr;
}
}
} // namespace
void WeakCodeRegistry::Track(CodeEntry* entry, Handle<AbstractCode> code) {
DCHECK(!*entry->heap_object_location_address());
DisallowGarbageCollection no_gc;
Handle<AbstractCode> handle = isolate_->global_handles()->Create(*code);
Address** heap_object_location_address =
entry->heap_object_location_address();
*heap_object_location_address = handle.location();
GlobalHandles::MakeWeak(heap_object_location_address);
entries_.push_back(entry);
}
void WeakCodeRegistry::Sweep(WeakCodeRegistry::Listener* listener) {
std::vector<CodeEntry*> alive_entries;
for (CodeEntry* entry : entries_) {
// Mark the CodeEntry as being deleted on the heap if the heap object
// location was nulled, indicating the object was freed.
if (!*entry->heap_object_location_address()) {
if (listener) {
listener->OnHeapObjectDeletion(entry);
}
} else {
alive_entries.push_back(entry);
}
}
entries_ = std::move(alive_entries);
}
void WeakCodeRegistry::Clear() {
for (CodeEntry* entry : entries_) {
Untrack(entry);
}
entries_.clear();
}
} // namespace internal
} // namespace v8
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