Macros to automatically call `jerry_release_value`?

[martijnthe]

Zephyr.js has a nice macro to declare const jerry_value_ts. It leverages the __attribute__ ((__cleanup__(...))) feature to automatically call jerry_release_value() on the value when the variable goes out of scope:

https://github.com/01org/zephyr.js/blob/ecf2fba29de4dafbd1c8e5b6b3ece636ac237213/src/zjs_util.h#L185

Example use:

... {
  ZVAL global = jerry_get_global_object();
  ...
  // no need to call jerry_release_value(global);
  // it will be released automatically by the cleanup function.
}

The advantages are quite obvious I think. The disadvantage is that it needs to be supported by the compiler. FWIW, GCC and clang support it.

Does it make sense to add a similar utility to jerry-ext?

[zherczeg]

Yes. This is completely optional, so those compilers who does not support it, will not use it.

[akosthekiss]

Closing as #1874 has landed