When profiling Dome Keeper, I found that in physics_process a HashMap
gets cleared a lot, which ends up calling the Variant destructor.
Calling Variant::clear() dominates this operation.
By not uselessly setting the Type to NIL on destruction we save about
50% of time. This is likely because if there is a simple type in the
Variant that doesn't need destructing, but now we write when we should
just drop the Variant altogether.
Since the value of Variant::type should be unobservable after
destruction this doesn't change any outward behavior.
This fixes UBSAN errors reported by running our testsuite, importing the
TPS demo, and running the TPS demo. I have tried, wherever possible, to
fix issues related to reported issues but not directly reported by UBSAN
because thse code paths just happened to not have been exercised in
these cases.
These fixes apply only to errors reported, and caused by, core/
The following things have been changed:
* Make sure there are no implicit sign changing casts in core.
* Explicitly type enums that are part of a public API such that users of
the API cannot pass in wrongly-sized values leading to potential stack
corruption.
* Ensure that memcpy is never called with invalid or null pointers as
this is undefined behavior, and when the engine is built with
optimizations turned on leads to memory corruption and hard to debug
crashes.
* Replace enum values only used as static values with constexpr static
const values instead. This has no runtime overhead. This makes it so
that the size of the enums is explicit.
* Make sure that nan and inf is handled consistently in String.
* Implement a _to_int template to ensure that all of the paths use the
same algorhithm, and correct the negative integer case.
* Changed the way the json serializer precision work, and added tests to
verify the new behavior. The behavior doesn't quite match master in
particulary for negative doubles as the original code tried to cast -inf
to an int. This then led to negative doubles losing all but one of
their decimal points when serializing. Behavior in GDScript remains
unchanged.
• `modernize-use-default-member-init` and `readability-redundant-member-init`
• Minor adjustments to `.clang-tidy` to improve syntax & remove redundancies
Variant operators for String formatting and "in" could result in errors, which would return from validated_evaluate without assigning r_ret. This would cause scripts using the return value from these operators to get results from previously run code. Updated to return the original String value in the String formatting case, and false for "in" when an error occurs.
