/*

 * 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.nashorn.internal.codegen.types;

import static jdk.internal.org.objectweb.asm.Opcodes.I2D;

import static jdk.internal.org.objectweb.asm.Opcodes.I2L;

import static jdk.internal.org.objectweb.asm.Opcodes.IADD;

import static jdk.internal.org.objectweb.asm.Opcodes.ICONST_0;

import static jdk.internal.org.objectweb.asm.Opcodes.ICONST_1;

import static jdk.internal.org.objectweb.asm.Opcodes.ILOAD;

import static jdk.internal.org.objectweb.asm.Opcodes.IRETURN;

import static jdk.internal.org.objectweb.asm.Opcodes.ISTORE;

import static jdk.nashorn.internal.codegen.CompilerConstants.staticCallNoLookup;

import static jdk.nashorn.internal.runtime.JSType.UNDEFINED_INT;

import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.INVALID_PROGRAM_POINT;

import jdk.internal.org.objectweb.asm.MethodVisitor;

import jdk.nashorn.internal.codegen.CompilerConstants;

/**

 * The boolean type class

 */

public final class BooleanType extends Type {

    private static final long serialVersionUID = 1L;

    private static final CompilerConstants.Call VALUE_OF = staticCallNoLookup(Boolean.class, "valueOf", Boolean.class, boolean.class);

    private static final CompilerConstants.Call TO_STRING = staticCallNoLookup(Boolean.class, "toString", String.class, boolean.class);

    /**

     * Constructor

     */

    protected BooleanType() {

        super("boolean", boolean.class, 1, 1);

    }

    @Override

    public Type nextWider() {

        return INT;

    }

    @Override

    public Class<?> getBoxedType() {

        return Boolean.class;

    }

    @Override

    public char getBytecodeStackType() {

        return 'I';

    }

    @Override

    public Type loadUndefined(final MethodVisitor method) {

        method.visitLdcInsn(UNDEFINED_INT);

        return BOOLEAN;

    }

    @Override

    public Type loadForcedInitializer(final MethodVisitor method) {

        method.visitInsn(ICONST_0);

        return BOOLEAN;

    }

    @Override

    public void _return(final MethodVisitor method) {

        method.visitInsn(IRETURN);

    }

    @Override

    public Type load(final MethodVisitor method, final int slot) {

        assert slot != -1;

        method.visitVarInsn(ILOAD, slot);

        return BOOLEAN;

    }

    @Override

    public void store(final MethodVisitor method, final int slot) {

        assert slot != -1;

        method.visitVarInsn(ISTORE, slot);

    }

    @Override

    public Type ldc(final MethodVisitor method, final Object c) {

        assert c instanceof Boolean;

        method.visitInsn((Boolean) c ? ICONST_1 : ICONST_0);

        return BOOLEAN;

    }

    @Override

    public Type convert(final MethodVisitor method, final Type to) {

        if (isEquivalentTo(to)) {

            return to;

        }

        if (to.isNumber()) {

            method.visitInsn(I2D);

        } else if (to.isLong()) {

            method.visitInsn(I2L);

        } else if (to.isInteger()) {

            //nop

        } else if (to.isString()) {

            invokestatic(method, TO_STRING);

        } else if (to.isObject()) {

            invokestatic(method, VALUE_OF);

        } else {

            throw new UnsupportedOperationException("Illegal conversion " + this + " -> " + to);

        }

        return to;

    }

    @Override

    public Type add(final MethodVisitor method, final int programPoint) {

        // Adding booleans in JavaScript is perfectly valid, they add as if false=0 and true=1

        return INT;

    }

}