2df4bd1f81
We use MethodHandles.asType to cast argument types into the appropriate parameter types for method calls when the target of the call is a def type at runtime. Currently, certain implicit casts using the def type are asymmetric. It is possible to cast Integer -> float as an argument to parameter, but not from int -> Float (boxed to primitive with upcasting is okay, but primitive to boxed with upcasting is not). This PR introduces a solution to the issue by generating bridge methods for all whitelisted methods that have at least a single boxed type as an argument. The bridge method will conduct appropriate casts and then call the original method. This adds a bit of overhead for correctness. It should not be used often as Painless avoids boxed types as much as possible. Note that a large portion of this change is adding methods to do the appropriate def to boxed type casts and a few mechanical changes as well. The most important method for review is generateBridgeMethod in PainlessLookupBuilder. |
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