mirror of
https://github.com/Mercury-Language/mercury.git
synced 2025-12-17 23:05:21 +00:00
e0a564f0f4
Branches: main
Fix two problems implementation of arrays for Java backend:
- array.from_list([1, 2, 3]) didn't work because it would create an Integer[]
array, but the code generated by the Mercury compiler would try to assign
it to a int[] variable. Fix this by special casing the primitive types to
create arrays with the expected types.
- We used the class of a representative element to determine the type of
an array to create. Enumeration types only have the one class
corresponding to the Mercury type, so the class of the representative
element is correct.
However, general d.u. types have subclasses for each functor, so the class
of a representative element could correspond to a functor. This meant that
arrays could only hold more elements with the same functor. What is needed
is actually the super class, corresponding to a Mercury type.
The solution adopted here is to make Java classes corresponding to Mercury
types implement an interface called `MercuryType'. Then we can tell
whether the class or the superclass of the representative element is the
one needed.
java/runtime/MercuryType.java:
Add the new interface.
compiler/ml_type_gen.m:
When the target language is Java, make d.u. parent types implement
the `MercuryType' interface.
compiler/mlds_to_java.m:
Make the `MercuryType' interface special so it is printed without an
arity suffix.
library/array.m:
Fix the problems with creating/resizing ararys.