Avoid refcounted copy in _object_properties_init() for internal classes #12474
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This currently uses ZVAL_COPY_OR_DUP, which copies the value and handles refcounting. However, internal classes cannot have refcounted default properties because of constraints imposed by zend_declare_typed_property(). So copying the value is sufficient. While this doesn't really improve the performance for our benchmarks, it improves performance for cases where a lot of temporary internal objects are instantiated. For example, when instantiating DOM classes: DOM objects are transient, so lots of temporary objects are created.
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dstogov
approved these changes
Oct 19, 2023
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This currently uses ZVAL_COPY_OR_DUP, which copies the value and handles refcounting. However, internal classes cannot have refcounted default properties because of constraints imposed by
zend_declare_typed_property(). So copying the value is sufficient.
While this doesn't really improve the performance for our benchmarks, it improves performance for cases where a lot of temporary internal objects are instantiated. For example, when instantiating DOM classes: DOM objects are transient, so lots of temporary objects are created.
I have a variant on my fork that adds a CE flag to extend this to user classes too (nielsdos#55). But the performance win is so small that I'm not convinced that's useful.