Examples with Event com.dat3m.dartagnan.program.event.core.Event used on opensource projects

Example 56 with Event

use of com.dat3m.dartagnan.program.event.core.Event in project Dat3M by hernanponcedeleon.

the class PropertyEncoder method encodeLiveness.

public BooleanFormula encodeLiveness(SolverContext ctx) {
    // Further, we assume that the spinloops are indeed correct, i.e., side-effect free
    class SpinLoop {

        public List<Load> loads = new ArrayList<>();

        public Event bound;
    }
    logger.info("Encoding liveness");
    Map<Thread, List<SpinLoop>> spinloopsMap = new HashMap<>();
    // Find spinloops of all threads
    for (Thread t : program.getThreads()) {
        List<Event> spinStarts = t.getEvents().stream().filter(e -> e instanceof Label && e.is(Tag.SPINLOOP)).collect(Collectors.toList());
        List<SpinLoop> spinLoops = new ArrayList<>();
        spinloopsMap.put(t, spinLoops);
        for (Event start : spinStarts) {
            SpinLoop loop = new SpinLoop();
            Event cur = start.getSuccessor();
            while (!cur.is(Tag.SPINLOOP)) {
                if (cur.is(Tag.READ)) {
                    loop.loads.add((Load) cur);
                }
                cur = cur.getSuccessor();
            }
            loop.bound = cur;
            spinLoops.add(loop);
        }
    }
    BooleanFormulaManager bmgr = ctx.getFormulaManager().getBooleanFormulaManager();
    RelRf rf = (RelRf) memoryModel.getRelationRepository().getRelation(RelationNameRepository.RF);
    RelCo co = (RelCo) memoryModel.getRelationRepository().getRelation(RelationNameRepository.CO);
    // Compute "stuckness": A thread is stuck if it reaches a spinloop bound event
    // while reading from a co-maximal write.
    Map<Thread, BooleanFormula> isStuckMap = new HashMap<>();
    for (Thread t : program.getThreads()) {
        List<SpinLoop> loops = spinloopsMap.get(t);
        if (loops.isEmpty()) {
            continue;
        }
        BooleanFormula isStuck = bmgr.makeFalse();
        for (SpinLoop pair : loops) {
            BooleanFormula allCoMaximalLoad = bmgr.makeTrue();
            for (Load load : pair.loads) {
                BooleanFormula coMaximalLoad = bmgr.makeFalse();
                for (Tuple rfEdge : rf.getMaxTupleSet().getBySecond(load)) {
                    coMaximalLoad = bmgr.or(coMaximalLoad, bmgr.and(rf.getSMTVar(rfEdge, ctx), co.getLastCoVar(rfEdge.getFirst(), ctx)));
                }
                allCoMaximalLoad = bmgr.and(allCoMaximalLoad, coMaximalLoad);
            }
            isStuck = bmgr.or(isStuck, bmgr.and(pair.bound.exec(), allCoMaximalLoad));
        }
        isStuckMap.put(t, isStuck);
    }
    // LivenessViolation <=> allStuckOrDone /\ atLeastOneStuck
    BooleanFormula allStuckOrDone = bmgr.makeTrue();
    BooleanFormula atLeastOneStuck = bmgr.makeFalse();
    for (Thread t : program.getThreads()) {
        BooleanFormula isStuck = isStuckMap.getOrDefault(t, bmgr.makeFalse());
        BooleanFormula isDone = t.getCache().getEvents(FilterBasic.get(Tag.BOUND)).stream().map(e -> bmgr.not(e.exec())).reduce(bmgr.makeTrue(), bmgr::and);
        atLeastOneStuck = bmgr.or(atLeastOneStuck, isStuck);
        allStuckOrDone = bmgr.and(allStuckOrDone, bmgr.or(isStuck, isDone));
    }
    // We use the SMT variable to extract from the model if the property was violated
    BooleanFormula enc = bmgr.equivalence(LIVENESS.getSMTVariable(ctx), bmgr.and(allStuckOrDone, atLeastOneStuck));
    return bmgr.and(LIVENESS.getSMTVariable(ctx), enc);
}

Example 57 with Event

use of com.dat3m.dartagnan.program.event.core.Event in project Dat3M by hernanponcedeleon.

the class SymmetryEncoder method sort.

private void sort(List<Tuple> row) {
    if (!breakBySyncDegree) {
        // ===== Natural order =====
        row.sort(Comparator.naturalOrder());
        return;
    }
    // ====== Sync-degree based order ======
    // Setup of data structures
    Set<Event> inEvents = new HashSet<>();
    Set<Event> outEvents = new HashSet<>();
    for (Tuple t : row) {
        inEvents.add(t.getFirst());
        outEvents.add(t.getSecond());
    }
    Map<Event, Integer> combInDegree = new HashMap<>(inEvents.size());
    Map<Event, Integer> combOutDegree = new HashMap<>(outEvents.size());
    List<Axiom> axioms = memoryModel.getAxioms();
    for (Event e : inEvents) {
        int syncDeg = axioms.stream().mapToInt(ax -> ax.getRelation().getMinTupleSet().getBySecond(e).size() + 1).max().orElse(0);
        combInDegree.put(e, syncDeg);
    }
    for (Event e : outEvents) {
        int syncDec = axioms.stream().mapToInt(ax -> ax.getRelation().getMinTupleSet().getByFirst(e).size() + 1).max().orElse(0);
        combOutDegree.put(e, syncDec);
    }
    // Sort by sync degrees
    row.sort(Comparator.<Tuple>comparingInt(t -> combInDegree.get(t.getFirst()) * combOutDegree.get(t.getSecond())).reversed());
}

Example 58 with Event

use of com.dat3m.dartagnan.program.event.core.Event in project Dat3M by hernanponcedeleon.

the class VisitorLitmusC method visitReAtomicOpReturn.

// ----------------------------------------------------------------------------------------------------------------
// Return expressions (memory reads, must have register for return value)
// Returns new value (the value after computation)
@Override
public IExpr visitReAtomicOpReturn(LitmusCParser.ReAtomicOpReturnContext ctx) {
    Register register = getReturnRegister(true);
    IExpr value = returnExpressionOrDefault(ctx.value, BigInteger.ONE);
    Event event = EventFactory.Linux.newRMWOpReturn(getAddress(ctx.address), register, value, ctx.op, ctx.mo);
    programBuilder.addChild(currentThread, event);
    return register;
}

Example 59 with Event

use of com.dat3m.dartagnan.program.event.core.Event in project Dat3M by hernanponcedeleon.

the class VisitorLitmusC method visitReAtomicFetchOp.

// Returns old value (the value before computation)
@Override
public IExpr visitReAtomicFetchOp(LitmusCParser.ReAtomicFetchOpContext ctx) {
    Register register = getReturnRegister(true);
    IExpr value = returnExpressionOrDefault(ctx.value, BigInteger.ONE);
    Event event = EventFactory.Linux.newRMWFetchOp(getAddress(ctx.address), register, value, ctx.op, ctx.mo);
    programBuilder.addChild(currentThread, event);
    return register;
}

Example 60 with Event

use of com.dat3m.dartagnan.program.event.core.Event in project Dat3M by hernanponcedeleon.

the class VisitorLitmusC method visitReReadNa.

@Override
public IExpr visitReReadNa(LitmusCParser.ReReadNaContext ctx) {
    Register register = getReturnRegister(true);
    Event event = EventFactory.newLoad(register, getAddress(ctx.address), "NA");
    programBuilder.addChild(currentThread, event);
    return register;
}