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node/src/node_persistent.h
T
Ben Noordhuis 992703f2b5 src: prevent persistent handle resource leaks
Replace v8::Persistent with node::Persistent, a specialization that
resets the persistent handle on destruction.  Prevents accidental
resource leaks when forgetting to call .Reset() manually.

I'm fairly confident this commit fixes a number of resource leaks that
have gone undiagnosed so far.

PR-URL: https://github.com/nodejs/node/pull/18656
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
2018-02-21 15:24:18 +01:00

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#ifndef SRC_NODE_PERSISTENT_H_
#define SRC_NODE_PERSISTENT_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#include "v8.h"
namespace node {
template <typename T>
struct ResetInDestructorPersistentTraits {
static const bool kResetInDestructor = true;
template <typename S, typename M>
// Disallow copy semantics by leaving this unimplemented.
inline static void Copy(
const v8::Persistent<S, M>&,
v8::Persistent<T, ResetInDestructorPersistentTraits<T>>*);
};
// v8::Persistent does not reset the object slot in its destructor. That is
// acknowledged as a flaw in the V8 API and expected to change in the future
// but for now node::Persistent is the easier and safer alternative.
template <typename T>
using Persistent = v8::Persistent<T, ResetInDestructorPersistentTraits<T>>;
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_NODE_PERSISTENT_H_