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// Copyright 2022 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.
#ifndef V8_HEAP_REFERENCE_SUMMARIZER_H_
#define V8_HEAP_REFERENCE_SUMMARIZER_H_
#include <unordered_set>
#include "src/objects/heap-object.h"
namespace v8 {
namespace internal {
class Heap;
class ReferenceSummary {
public:
ReferenceSummary() = default;
ReferenceSummary(ReferenceSummary&& other) V8_NOEXCEPT
: strong_references_(std::move(other.strong_references_)),
weak_references_(std::move(other.weak_references_)) {}
// Produces a set of objects referred to by the object. This function uses a
// realistic marking visitor, so its results are likely to match real GC
// behavior. Intended only for verification.
static ReferenceSummary SummarizeReferencesFrom(Heap* heap,
Tagged<HeapObject> obj);
using UnorderedHeapObjectSet =
std::unordered_set<HeapObject, Object::Hasher, Object::KeyEqualSafe>;
// All objects which the chosen object has strong pointers to.
UnorderedHeapObjectSet& strong_references() { return strong_references_; }
// All objects which the chosen object has weak pointers to. The values in
// ephemeron hash tables are also included here, even though they aren't
// normal weak pointers.
UnorderedHeapObjectSet& weak_references() { return weak_references_; }
void Clear() {
strong_references_.clear();
weak_references_.clear();
}
private:
UnorderedHeapObjectSet strong_references_;
UnorderedHeapObjectSet weak_references_;
DISALLOW_GARBAGE_COLLECTION(no_gc)
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_REFERENCE_SUMMARIZER_H_
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