Examples with Constant gov.sandia.n2a.language.Constant used on opensource projects

Example 1 with Constant

use of gov.sandia.n2a.language.Constant in project n2a by frothga.

the class EquationSet method addSpecials.

/**
 *        Add variables to equation set that are needed, but that the user should not normally define.
 *        Depends on results of: none
 */
public void addSpecials() {
    for (EquationSet s : parts) {
        s.addSpecials();
    }
    // force $init to exist
    setInit(0);
    Variable v = new Variable("$t", 0);
    if (add(v)) {
        v.equations = new TreeSet<EquationEntry>();
    }
    // $t'
    v = new Variable("$t", 1);
    if (add(v)) {
        v.equations = new TreeSet<EquationEntry>();
    }
    if (// top-level model
    container == null) {
        // must have a termination condition
        v = new Variable("$p", 0);
        if (// but it doesn't
        add(v)) {
            try {
                // limit sim time to 1 second, if not otherwise specified
                String duration = getNamedValue("duration", "1");
                v.add(new EquationEntry("$t<" + duration));
            } catch (Exception parseError) {
                try {
                    v.add(new EquationEntry("$t<1"));
                }// This exception should never happen. We simply want to silence Java about it.
                 catch (Exception parseError2) {
                }
            }
        }
    }
    // $live functions much the same as $init. See setInit().
    v = new Variable("$live", 0);
    if (add(v)) {
        // default. Actual values should be set by setAttributeLive()
        v.addAttribute("constant");
        EquationEntry e = new EquationEntry(v, "");
        e.expression = new Constant(new Scalar(1));
        v.add(e);
    }
    v = new Variable("$type", 0);
    if (add(v)) {
        v.equations = new TreeSet<EquationEntry>();
    }
    if (connected || connectionBindings == null) {
        v = new Variable("$index", 0);
        if (add(v)) {
            // most backends will set $index before processing init equations
            v.addAttribute("initOnly");
            v.equations = new TreeSet<EquationEntry>();
        } else {
            v = find(v);
        }
        // Force $index to exist for connection targets. Used for anti-indexing into list of instances.
        if (connected)
            v.addUser(this);
        v = new Variable("$n", 0);
        if (add(v)) {
            // default. Actual values set by client code.
            v.addAttribute("constant");
            EquationEntry e = new EquationEntry(v, "");
            e.expression = new Constant(new Scalar(1));
            v.add(e);
        }
    }
}

Example 2 with Constant

use of gov.sandia.n2a.language.Constant in project n2a by frothga.

the class EquationSet method getInit.

public boolean getInit() {
    Variable init = find(new Variable("$init"));
    if (init == null)
        return false;
    EquationEntry e = init.equations.first();
    return ((Scalar) ((Constant) e.expression).value).value == 1.0;
}

Example 3 with Constant

use of gov.sandia.n2a.language.Constant in project n2a by frothga.

the class EquationSet method setInit.

/**
 *        Change the value of the constant $init in the current equation set.
 *        Used to indicate if we are in the init phase or not.
 */
public void setInit(float value) {
    Variable init = find(new Variable("$init"));
    if (init == null) {
        init = new Variable("$init", 0);
        // TODO: should really be "initOnly", since it changes value during (at the end of) the init cycle.
        init.addAttribute("constant");
        EquationEntry e = new EquationEntry(init, "");
        e.expression = new Constant(new Scalar(value));
        init.add(e);
        add(init);
    } else {
        EquationEntry e = init.equations.first();
        ((Scalar) ((Constant) e.expression).value).value = value;
    }
}

Example 4 with Constant

use of gov.sandia.n2a.language.Constant in project n2a by frothga.

the class JobC method generateStatic.

public void generateStatic(final EquationSet s, final StringBuilder result) {
    for (EquationSet p : s.parts) generateStatic(p, result);
    // Generate static definitions
    final BackendDataC bed = (BackendDataC) s.backendData;
    class CheckStatic extends Visitor {

        public boolean global;

        public boolean visit(Operator op) {
            if (op instanceof Constant) {
                Type m = ((Constant) op).value;
                if (m instanceof Matrix) {
                    Matrix A = (Matrix) m;
                    int rows = A.rows();
                    int cols = A.columns();
                    String matrixName = "Matrix" + matrixNames.size();
                    matrixNames.put(op, matrixName);
                    if (rows == 3 && cols == 1)
                        result.append("Vector3 " + matrixName + " = Matrix<float>");
                    else
                        result.append("Matrix<float> " + matrixName);
                    result.append(" (\"" + A + "\");\n");
                }
                // Don't try to descend tree from here
                return false;
            }
            if (op instanceof Function) {
                Function f = (Function) op;
                if (// We need to auto-generate the column name.
                f instanceof Output && f.operands.length < 3) {
                    String stringName = "columnName" + stringNames.size();
                    stringNames.put(op, stringName);
                    if (global) {
                        bed.setGlobalNeedPath(s);
                        bed.globalColumns.add(stringName);
                    } else {
                        bed.setLocalNeedPath(s);
                        bed.localColumns.add(stringName);
                    }
                }
                // Detect functions that need static handles
                if (f.operands.length > 0) {
                    Operator operand0 = f.operands[0];
                    if (operand0 instanceof Constant) {
                        Constant c = (Constant) operand0;
                        Type o = c.value;
                        if (o instanceof Text) {
                            String fileName = ((Text) o).value;
                            if (op instanceof ReadMatrix) {
                                if (!matrixNames.containsKey(fileName)) {
                                    String matrixName = "Matrix" + matrixNames.size();
                                    matrixNames.put(fileName, matrixName);
                                    result.append("MatrixInput * " + matrixName + " = matrixHelper (\"" + fileName + "\");\n");
                                }
                            } else if (f instanceof Input) {
                                if (!inputNames.containsKey(fileName)) {
                                    String inputName = "Input" + inputNames.size();
                                    inputNames.put(fileName, inputName);
                                    result.append("InputHolder * " + inputName + " = inputHelper (\"" + fileName + "\");\n");
                                }
                            } else if (f instanceof Output) {
                                if (!outputNames.containsKey(fileName)) {
                                    String outputName = "Output" + outputNames.size();
                                    outputNames.put(fileName, outputName);
                                    result.append("OutputHolder * " + outputName + " = outputHelper (\"" + fileName + "\");\n");
                                }
                            }
                        }
                    } else // Dynamic file name (no static handle)
                    {
                        if (f instanceof ReadMatrix) {
                            matrixNames.put(op, "Matrix" + matrixNames.size());
                            stringNames.put(operand0, "fileName" + stringNames.size());
                        } else if (f instanceof Input) {
                            inputNames.put(op, "Input" + inputNames.size());
                            stringNames.put(operand0, "fileName" + stringNames.size());
                        } else if (f instanceof Output) {
                            outputNames.put(op, "Output" + outputNames.size());
                            stringNames.put(operand0, "fileName" + stringNames.size());
                        }
                    }
                }
                // Functions could be nested, so continue descent.
                return true;
            }
            return true;
        }
    }
    CheckStatic checkStatic = new CheckStatic();
    for (Variable v : s.ordered) {
        checkStatic.global = v.hasAttribute("global");
        v.visit(checkStatic);
    }
}

Example 5 with Constant

use of gov.sandia.n2a.language.Constant in project n2a by frothga.

the class InternalBackendData method analyzeEvents.

public static void analyzeEvents(final EquationSet s, final List<EventTarget> eventTargets, final List<Variable> eventReferences) {
    class EventVisitor extends Visitor {

        public boolean found;

        public boolean visit(Operator op) {
            if (op instanceof Event) {
                found = true;
                Event de = (Event) op;
                if (// this event has not yet been analyzed
                de.eventType == null) {
                    final EventTarget et = new EventTarget(de);
                    int targetIndex = eventTargets.indexOf(et);
                    if (// event target already exists
                    targetIndex >= 0) {
                        de.eventType = eventTargets.get(targetIndex);
                    } else // we must create a new event target, or more properly, fill in the event target we just used as a query object
                    {
                        // Create an entry and save the index
                        targetIndex = eventTargets.size();
                        eventTargets.add(et);
                        de.eventType = et;
                        et.container = s;
                        // Determine edge type
                        if (de.operands.length < 3) {
                            et.edge = EventTarget.RISE;
                        } else if (de.operands[2] instanceof Constant) {
                            Constant c = (Constant) de.operands[2];
                            if (c.value instanceof Text) {
                                Text t = (Text) c.value;
                                if (t.value.equalsIgnoreCase("nonzero"))
                                    et.edge = EventTarget.NONZERO;
                                else if (t.value.equalsIgnoreCase("change"))
                                    et.edge = EventTarget.CHANGE;
                                else if (t.value.equalsIgnoreCase("fall"))
                                    et.edge = EventTarget.FALL;
                                else
                                    et.edge = EventTarget.RISE;
                            } else {
                                Backend.err.get().println("ERROR: event() edge type must be a string.");
                                throw new Backend.AbortRun();
                            }
                        } else {
                            Backend.err.get().println("ERROR: event() edge type must be constant.");
                            throw new Backend.AbortRun();
                        }
                        // Allocate auxiliary variable
                        if (de.operands[0] instanceof AccessVariable) {
                            AccessVariable av = (AccessVariable) de.operands[0];
                            VariableReference reference = av.reference;
                            Variable v = reference.variable;
                            // then the user has broken the rule that we can't see temporaries in other parts.
                            if (v.hasAttribute("temporary") && v.container != s) {
                                Backend.err.get().println("WARNING: Cannot be temporary due to event monitor: " + v.container.name + "." + v.nameString() + " from " + s.name);
                                v.removeAttribute("temporary");
                            }
                            // so fall through to the !trackOne case below.
                            if (!v.hasAttribute("temporary")) {
                                // ensure it's buffered, so we can detect change
                                v.addAttribute("externalRead");
                                et.trackOne = true;
                                // just a holder for the reference
                                et.track = new Variable();
                                et.track.reference = reference;
                            }
                        }
                        if (// Expression, so create auxiliary variable. Aux not needed for NONZERO, because no change detection.
                        !et.trackOne && et.edge != EventTarget.NONZERO) {
                            et.track = new Variable("eventAux" + targetIndex, 0);
                            et.track.type = new Scalar(0);
                            et.track.reference = new VariableReference();
                            et.track.reference.variable = et.track;
                        }
                        // Locate any temporaries for evaluation. TODO: for more efficiency, we could have separate lists of temporaries for the condition and delay operands
                        // Tie into the dependency graph using a phantom variable (which can go away afterward without damaging the graph).
                        final Variable phantom = new Variable("event");
                        phantom.uses = new IdentityHashMap<Variable, Integer>();
                        for (int i = 0; i < et.event.operands.length; i++) et.event.operands[i].visit(new Visitor() {

                            public boolean visit(Operator op) {
                                if (op instanceof AccessVariable) {
                                    AccessVariable av = (AccessVariable) op;
                                    Variable v = av.reference.variable;
                                    if (!phantom.uses.containsKey(v))
                                        phantom.uses.put(v, 1);
                                    return false;
                                }
                                return true;
                            }
                        });
                        // Scan all variables in equation set to see if we need them
                        for (Variable t : s.variables) {
                            if (t.hasAttribute("temporary") && phantom.dependsOn(t) != null)
                                et.dependencies.add(t);
                        }
                        // Note the default is already set to -1 (no care)
                        class DelayVisitor extends Visitor {

                            TreeSet<EquationSet> containers = new TreeSet<EquationSet>();

                            public boolean visit(Operator op) {
                                if (op instanceof AccessVariable) {
                                    AccessVariable av = (AccessVariable) op;
                                    // could include the target part itself, if in fact we use local variables
                                    containers.add(av.reference.variable.container);
                                    return false;
                                }
                                return true;
                            }
                        }
                        DelayVisitor dv = new DelayVisitor();
                        if (de.operands.length >= 2) {
                            if (de.operands[1] instanceof Constant) {
                                Constant c = (Constant) de.operands[1];
                                et.delay = (float) ((Scalar) c.value).value;
                                if (et.delay < 0)
                                    et.delay = -1;
                            } else {
                                // indicates that we need to evaluate delay at run time
                                et.delay = -2;
                                de.operands[1].visit(dv);
                            }
                        }
                        // Set up monitors in source parts
                        class ConditionVisitor extends Visitor {

                            TreeSet<EquationSet> containers = new TreeSet<EquationSet>();

                            public boolean visit(Operator op) {
                                if (op instanceof AccessVariable) {
                                    AccessVariable av = (AccessVariable) op;
                                    Variable v = av.reference.variable;
                                    EquationSet sourceContainer = v.container;
                                    containers.add(sourceContainer);
                                    // Set up monitors for values that can vary during update.
                                    if (!v.hasAttribute("constant") && !v.hasAttribute("initOnly") && !et.monitors(sourceContainer)) {
                                        EventSource es = new EventSource(sourceContainer, et);
                                        // null means self-reference, a special case handled in Part
                                        if (sourceContainer != s)
                                            es.reference = av.reference;
                                        et.sources.add(es);
                                    }
                                    return false;
                                }
                                return true;
                            }
                        }
                        ConditionVisitor cv = new ConditionVisitor();
                        de.operands[0].visit(cv);
                        // Special case for event with no references that vary
                        if (et.sources.isEmpty()) {
                            // We can avoid creating a self monitor if we know for certain that the event will never fire
                            boolean neverFires = false;
                            if (de.operands[0] instanceof Constant) {
                                if (et.edge == EventTarget.NONZERO) {
                                    Type op0 = ((Constant) de.operands[0]).value;
                                    if (op0 instanceof Scalar) {
                                        neverFires = ((Scalar) op0).value == 0;
                                    } else {
                                        Backend.err.get().println("ERROR: Condition for event() must resolve to a number.");
                                        throw new Backend.AbortRun();
                                    }
                                } else {
                                    neverFires = true;
                                }
                            }
                            if (!neverFires) {
                                EventSource es = new EventSource(s, et);
                                // This is a self-reference, so es.reference should be null.
                                et.sources.add(es);
                            }
                        }
                        // Determine if monitor needs to test every target, or if one representative target is sufficient
                        for (EventSource source : et.sources) {
                            // associated with any given source instance, so every target must be evaluated separately.
                            if (cv.containers.size() > 1)
                                source.testEach = true;
                            if (dv.containers.size() > 1 || (dv.containers.size() == 1 && dv.containers.first() != source.container))
                                source.delayEach = true;
                        }
                    }
                }
            }
            return true;
        }
    }
    EventVisitor eventVisitor = new EventVisitor();
    for (Variable v : s.variables) {
        eventVisitor.found = false;
        v.visit(eventVisitor);
        if ((eventVisitor.found || v.dependsOnEvent()) && v.reference.variable != v)
            eventReferences.add(v);
    }
}