mirror of
https://github.com/AdaCore/cvc5.git
synced 2026-02-12 12:32:16 -08:00
113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
/******************************************************************************
|
|
* Top contributors (to current version):
|
|
* Abdalrhman Mohamed, Mathias Preiner, Andrew Reynolds
|
|
*
|
|
* This file is part of the cvc5 project.
|
|
*
|
|
* Copyright (c) 2009-2022 by the authors listed in the file AUTHORS
|
|
* in the top-level source directory and their institutional affiliations.
|
|
* All rights reserved. See the file COPYING in the top-level source
|
|
* directory for licensing information.
|
|
* ****************************************************************************
|
|
*
|
|
* A simple demonstration of the Sygus API.
|
|
*
|
|
* A simple demonstration of how to use the Sygus API to synthesize max and min
|
|
* functions.
|
|
*/
|
|
|
|
#include <cvc5/cvc5.h>
|
|
|
|
#include <iostream>
|
|
|
|
#include "utils.h"
|
|
|
|
using namespace cvc5;
|
|
|
|
int main()
|
|
{
|
|
Solver slv;
|
|
|
|
// required options
|
|
slv.setOption("sygus", "true");
|
|
slv.setOption("incremental", "false");
|
|
|
|
// set the logic
|
|
slv.setLogic("LIA");
|
|
|
|
Sort integer = slv.getIntegerSort();
|
|
Sort boolean = slv.getBooleanSort();
|
|
|
|
// declare input variables for the functions-to-synthesize
|
|
Term x = slv.mkVar(integer, "x");
|
|
Term y = slv.mkVar(integer, "y");
|
|
|
|
// declare the grammar non-terminals
|
|
Term start = slv.mkVar(integer, "Start");
|
|
Term start_bool = slv.mkVar(boolean, "StartBool");
|
|
|
|
// define the rules
|
|
Term zero = slv.mkInteger(0);
|
|
Term one = slv.mkInteger(1);
|
|
|
|
Term plus = slv.mkTerm(ADD, {start, start});
|
|
Term minus = slv.mkTerm(SUB, {start, start});
|
|
Term ite = slv.mkTerm(ITE, {start_bool, start, start});
|
|
|
|
Term And = slv.mkTerm(AND, {start_bool, start_bool});
|
|
Term Not = slv.mkTerm(NOT, {start_bool});
|
|
Term leq = slv.mkTerm(LEQ, {start, start});
|
|
|
|
// create the grammar object
|
|
Grammar g = slv.mkGrammar({x, y}, {start, start_bool});
|
|
|
|
// bind each non-terminal to its rules
|
|
g.addRules(start, {zero, one, x, y, plus, minus, ite});
|
|
g.addRules(start_bool, {And, Not, leq});
|
|
|
|
// declare the functions-to-synthesize. Optionally, provide the grammar
|
|
// constraints
|
|
Term max = slv.synthFun("max", {x, y}, integer, g);
|
|
Term min = slv.synthFun("min", {x, y}, integer);
|
|
|
|
// declare universal variables.
|
|
Term varX = slv.declareSygusVar("x", integer);
|
|
Term varY = slv.declareSygusVar("y", integer);
|
|
|
|
Term max_x_y = slv.mkTerm(APPLY_UF, {max, varX, varY});
|
|
Term min_x_y = slv.mkTerm(APPLY_UF, {min, varX, varY});
|
|
|
|
// add semantic constraints
|
|
// (constraint (>= (max x y) x))
|
|
slv.addSygusConstraint(slv.mkTerm(GEQ, {max_x_y, varX}));
|
|
|
|
// (constraint (>= (max x y) y))
|
|
slv.addSygusConstraint(slv.mkTerm(GEQ, {max_x_y, varY}));
|
|
|
|
// (constraint (or (= x (max x y))
|
|
// (= y (max x y))))
|
|
slv.addSygusConstraint(slv.mkTerm(OR,
|
|
{slv.mkTerm(EQUAL, {max_x_y, varX}),
|
|
slv.mkTerm(EQUAL, {max_x_y, varY})}));
|
|
|
|
// (constraint (= (+ (max x y) (min x y))
|
|
// (+ x y)))
|
|
slv.addSygusConstraint(slv.mkTerm(
|
|
EQUAL,
|
|
{slv.mkTerm(ADD, {max_x_y, min_x_y}), slv.mkTerm(ADD, {varX, varY})}));
|
|
|
|
// print solutions if available
|
|
if (slv.checkSynth().hasSolution())
|
|
{
|
|
// Output should be equivalent to:
|
|
// (
|
|
// (define-fun max ((x Int) (y Int)) Int (ite (<= x y) y x))
|
|
// (define-fun min ((x Int) (y Int)) Int (ite (<= x y) x y))
|
|
// )
|
|
std::vector<Term> terms = {max, min};
|
|
utils::printSynthSolutions(terms, slv.getSynthSolutions(terms));
|
|
}
|
|
|
|
return 0;
|
|
}
|