openjdk8/vectors/simple/20230905a #625
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(INCOMPLETE) Start of exploration on simplifying and improving support for sequences, vectors, and arrays by using generics and functions shipped as part of openjdk8. Goals: 1) Simplify class structure with parameterized types 2) Use openjdk8 methods like Arrays.fill(), sort() et. al. 3) Reduce memory use for "oversized" buffers 4) Optimize speed of basic operations TODO need some benchmarks to test before/after
INCOMPLETE: after finishing implementation, needs to be wired into MAKE-ARRAY to be useful.
TODO: wire getDescription() for our type menagerie Using the BuiltinClass hierarchy causes problems, so getDescription() is one way to indicate what implementation class is actually handling a specialization of sequence types.
It should work, as it references the upper-case operators, which should thunk down to the AREF, etc. methods in BasicVectorBuffer, but I could be wrong about the inheritance.
This doesn't seem to help anything.
Mark BasicVector as abstract.
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Java bytes are signed, which means that accessing such a value from Lisp should be converted into a negative value between [-127 0) for bytes with a the high bit set [128 255). The in-progress changes to use unsigned-byte currently inadvertantly "fixes" direct use of such values to set places in UNSIGNED-BYTE arrays. <armedbear/abcl#625>
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Overhaul of underlying sequence code starting with
simple-vectorUse openjdk8 library to greater effect:
java.nio.Buffer,java.util.arraybuild copy, fill, replace functions.A work in progress…
Supersedes #624.
--
Previous work using generics didn't really pan out. Use strategy of single class with switch on Java enumeration to bring code-paths "closer" together.
Notes on previous approach:
*** Use of generics doesn't seem to help implementation BasicVectorBuffer
One has to "record" the specialization via adding the class to the
constructor anyways.
The parameterized type can't be used as discriminator type for
different functions by arguments, as type erasure makes things an
Object anyways.