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https://github.com/AdaCore/cvc5.git
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7d16d25dc9
Fixes #2846. One of the challenges of the Java bindings is that the garbage collector can delete unused objects at any time in any order. This is an issue with CVC4's API because we require all `Expr`s to be deleted before the corresponding `ExprManager`. In the past, we were using `NewGlobalRef`/`DeleteGlobalRef` on the wrapper object of `ExprManager`. The problem is that we can have multiple instances of the wrapper that internally all refer to the same `ExprManager`. This commit implements a different approach where the Java wrappers hold an explicit reference to the `ExprManager`. The commit also removes some unused or unimportant API bits from the bindings.
63 lines
2.0 KiB
Java
63 lines
2.0 KiB
Java
/********************* */
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/*! \file SimpleVC.java
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** \verbatim
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** Top contributors (to current version):
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** Morgan Deters, Aina Niemetz, Andres Noetzli
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** This file is part of the CVC4 project.
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** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
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** in the top-level source directory) and their institutional affiliations.
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** All rights reserved. See the file COPYING in the top-level source
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** directory for licensing information.\endverbatim
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**
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** \brief A simple demonstration of the Java interface
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**
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** A simple demonstration of the Java interface.
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**
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** To run the resulting class file, you need to do something like the
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** following:
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**
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** java \
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** -cp path/to/CVC4.jar:SimpleVC.jar \
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** -Djava.library.path=/dir/containing/libcvc4jni.so \
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** SimpleVC
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**
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**/
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import edu.stanford.CVC4.*;
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public class SimpleVC {
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public static void main(String[] args) {
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System.loadLibrary("cvc4jni");
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ExprManager em = new ExprManager();
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SmtEngine smt = new SmtEngine(em);
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// Prove that for integers x and y:
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// x > 0 AND y > 0 => 2x + y >= 3
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Type integer = em.integerType();
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Expr x = em.mkVar("x", integer);
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Expr y = em.mkVar("y", integer);
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Expr zero = em.mkConst(new Rational(0));
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Expr x_positive = em.mkExpr(Kind.GT, x, zero);
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Expr y_positive = em.mkExpr(Kind.GT, y, zero);
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Expr two = em.mkConst(new Rational(2));
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Expr twox = em.mkExpr(Kind.MULT, two, x);
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Expr twox_plus_y = em.mkExpr(Kind.PLUS, twox, y);
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Expr three = em.mkConst(new Rational(3));
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Expr twox_plus_y_geq_3 = em.mkExpr(Kind.GEQ, twox_plus_y, three);
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Expr formula =
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em.mkExpr(Kind.AND, x_positive, y_positive).impExpr(twox_plus_y_geq_3);
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System.out.println(
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"Checking entailment of formula " + formula + " with CVC4.");
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System.out.println("CVC4 should report ENTAILED.");
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System.out.println("Result from CVC4 is: " + smt.checkEntailed(formula));
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}
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}
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