weak-code-registry.h

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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.
 
#ifndef V8_PROFILER_WEAK_CODE_REGISTRY_H_
#define V8_PROFILER_WEAK_CODE_REGISTRY_H_
 
#include <vector>
 
#include "src/execution/isolate.h"
#include "src/objects/objects.h"
#include "src/profiler/profile-generator.h"
 
namespace v8 {
namespace internal {
 
class V8_EXPORT_PRIVATE WeakCodeRegistry {
 public:
  struct Listener {
    virtual void OnHeapObjectDeletion(CodeEntry* entry) = 0;
  };
 
  explicit WeakCodeRegistry(Isolate* isolate) : isolate_(isolate) {}
  ~WeakCodeRegistry() { Clear(); }
 
  void Track(CodeEntry* entry, DirectHandle<AbstractCode> code);
 
  // Removes all dead code objects from the registry, invoking the provided
  // listener for each new CodeEntry that is no longer referenced on the heap
  // (if set).
  void Sweep(Listener* listener);
 
  // Removes all heap object tracking from stored CodeEntries.
  void Clear();
 
 private:
  Isolate* const isolate_;
  // Invariant: Entries will always be removed here before the
  // InstructionStreamMap is destroyed. CodeEntries should not be freed while
  // their heap objects exist.
  std::vector<CodeEntry*> entries_;
};
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_PROFILER_WEAK_CODE_REGISTRY_H_