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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package jdk.test.lib.jittester.factories;

import jdk.test.lib.Pair;
import jdk.test.lib.jittester.IRNode;
import jdk.test.lib.jittester.ProductionFailedException;
import jdk.test.lib.jittester.SymbolTable;
import jdk.test.lib.jittester.TernaryOperator;
import jdk.test.lib.jittester.Type;
import jdk.test.lib.jittester.TypeList;
import jdk.test.lib.jittester.utils.TypeUtil;
import jdk.test.lib.jittester.types.TypeKlass;
import jdk.test.lib.jittester.types.TypeBoolean;
import jdk.test.lib.jittester.utils.PseudoRandom;

class TernaryOperatorFactory extends OperatorFactory {
    protected final Type resultType;
    protected final TypeKlass ownerClass;

    TernaryOperatorFactory(long complexityLimit, int operatorLimit, TypeKlass ownerClass,
            Type resultType, boolean exceptionSafe, boolean noconsts) {
        super(2, complexityLimit, operatorLimit, exceptionSafe, noconsts);
        this.resultType = resultType;
        this.ownerClass = ownerClass;
    }

    private Pair<Type, Type> generateTypes() {
        Pair<Type, Type> types = new Pair<>(resultType, PseudoRandom.randomElement(
                TypeUtil.getImplicitlyCastable(TypeList.getAll(), resultType)));
        if (PseudoRandom.randomBoolean())
            types = new Pair<>(types.second, types.first);
        return types;
    }

    private IRNode generateProduction(Type conditionType, Type leftType, Type rightType) throws ProductionFailedException {
        int leftOpLimit = (int) (PseudoRandom.random() * 0.3 * (operatorLimit - 1));
        int rightOpLimit = (int) (PseudoRandom.random() * 0.3 * (operatorLimit - 1));
        int condOpLimit = operatorLimit - 1 - leftOpLimit - rightOpLimit;
        long leftComplLimit = (long) (PseudoRandom.random() * 0.3 * (complexityLimit - 1));
        long rightComplLimit = (long) (PseudoRandom.random() * 0.3 * (complexityLimit - 1));
        long condComplLimit = complexityLimit - 1 - leftComplLimit - rightComplLimit;
        if (leftComplLimit == 0 || rightComplLimit == 0 || condComplLimit == 0
                || leftOpLimit == 0 || rightOpLimit == 0 || condOpLimit == 0) {
            throw new ProductionFailedException();
        }
        IRNodeBuilder builder = new IRNodeBuilder().setOwnerKlass(ownerClass)
                .setExceptionSafe(exceptionSafe);
        IRNode conditionalExp = builder.setComplexityLimit(condComplLimit)
                .setOperatorLimit(condOpLimit)
                .setResultType(conditionType)
                .setNoConsts(noconsts)
                .getExpressionFactory()
                .produce();
        // Ignore initializations performed in left and right branches:
        IRNode leftExp;
        SymbolTable.push();
        try {
            leftExp = builder.setComplexityLimit(leftComplLimit)
                    .setOperatorLimit(leftOpLimit)
                    .setResultType(leftType)
                    .setNoConsts(false)
                    .getExpressionFactory()
                    .produce();
        } finally {
            SymbolTable.pop();
        }
        IRNode rightExp;
        SymbolTable.push();
        try {
            rightExp = builder.setComplexityLimit(rightComplLimit)
                    .setOperatorLimit(rightOpLimit)
                    .setResultType(rightType)
                    .setNoConsts(false)
                    .getExpressionFactory()
                    .produce();
        } finally {
            SymbolTable.pop();
        }
        return new TernaryOperator(conditionalExp, leftExp, rightExp);
    }

    @Override
    public IRNode produce() throws ProductionFailedException {
        Pair<Type, Type> types;
        try {
            types = generateTypes();
        } catch (RuntimeException ex) {
            throw new ProductionFailedException(ex.getMessage());
        }
        try {
            SymbolTable.push();
            IRNode result = generateProduction(new TypeBoolean(), types.first, types.second);
            SymbolTable.merge();
            return result;
        } catch (ProductionFailedException e) {
            SymbolTable.pop();
            throw e;
        }
    }
}