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Improved Java phantom references (#7131)

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* Reworked phantom reference handling.
 - Replaced IDecRefQueue with a new Z3ReferenceQueue class
 - Z3ReferenceQueue manages custom subclasses of phantom references in a doubly-linked list
 - Replaced all subclasses of IDecRefQueue with subclasses of Z3ReferenceQueue.Reference. These custom reference classes are embedded in the class they reference count.
 - Context now owns a single Z3ReferenceQueue for all types of references.

* Made Statistics.Entry a static subclass

* Made Context.close idempotent (as recommended)

* Update CMakeLists.txt for building the Java API.

* Updated CMakeLists.txt again.

* Use correct SuppressWarning annotation to silence the compiler

* Formatting
This commit is contained in:
Thomas Haas 2024-02-21 17:39:58 +01:00 • committed by GitHub
parent f7691d34fd
commit a3d00ce356
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41 changed files with 448 additions and 805 deletions
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17
src/api/java/Fixedpoint.java
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@ -19,6 +19,8 @@ package com.microsoft.z3;
import com.microsoft.z3.enumerations.Z3_lbool;
import java.lang.ref.ReferenceQueue;
/**
* Object for managing fixedpoints
**/
@ -327,9 +329,18 @@ public class Fixedpoint extends Z3Object
@Override
void addToReferenceQueue() {
getContext().getFixedpointDRQ().storeReference(getContext(), this);
getContext().getReferenceQueue().storeReference(this, FixedpointRef::new);
}
@Override
void checkNativeObject(long obj) { }
private static class FixedpointRef extends Z3ReferenceQueue.Reference<Fixedpoint> {
private FixedpointRef(Fixedpoint referent, ReferenceQueue<Z3Object> q) {
super(referent, q);
}
@Override
void decRef(Context ctx, long z3Obj) {
Native.fixedpointDecRef(ctx.nCtx(), z3Obj);
}
}
}