/*

 * Copyright (c) 1994, 2003, 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.  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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.tools.tree;

import sun.tools.java.*;

import sun.tools.asm.Assembler;

import sun.tools.asm.Label;

import java.io.PrintStream;

import java.util.Hashtable;

/**

 * WARNING: The contents of this source file are not part of any

 * supported API.  Code that depends on them does so at its own risk:

 * they are subject to change or removal without notice.

 */

public

class CastExpression extends BinaryExpression {

    /**

     * constructor

     */

    public CastExpression(long where, Expression left, Expression right) {

        super(CAST, where, left.type, left, right);

    }

    /**

     * Check the expression

     */

    public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) {

        type = left.toType(env, ctx);

        vset = right.checkValue(env, ctx, vset, exp);

        if (type.isType(TC_ERROR) || right.type.isType(TC_ERROR)) {

            // An error was already reported

            return vset;

        }

        if (type.equals(right.type)) {

            // The types are already the same

            return vset;

        }

        try {

            if (env.explicitCast(right.type, type)) {

                right = new ConvertExpression(where, type, right);

                return vset;

            }

        } catch (ClassNotFound e) {

            env.error(where, "class.not.found", e.name, opNames[op]);

        }

        // The cast is not allowed

        env.error(where, "invalid.cast", right.type, type);

        return vset;

    }

    /**

     * Check if constant

     */

    public boolean isConstant() {

        if (type.inMask(TM_REFERENCE) && !type.equals(Type.tString)) {

            // must be a primitive type, or String

            return false;

        }

        return right.isConstant();

    }

    /**

     * Inline

     */

    public Expression inline(Environment env, Context ctx) {

        return right.inline(env, ctx);

    }

    public Expression inlineValue(Environment env, Context ctx) {

        return right.inlineValue(env, ctx);

    }

    public int costInline(int thresh, Environment env, Context ctx) {

        if (ctx == null) {

            return 1 + right.costInline(thresh, env, ctx);

        }

        // sourceClass is the current class trying to inline this method

        ClassDefinition sourceClass = ctx.field.getClassDefinition();

        try {

            // We only allow the inlining if the current class can access

            // the casting class

            if (left.type.isType(TC_ARRAY) ||

                 sourceClass.permitInlinedAccess(env,

                                  env.getClassDeclaration(left.type)))

                return 1 + right.costInline(thresh, env, ctx);

        } catch (ClassNotFound e) {

        }

        return thresh;

    }

    /**

     * Print

     */

    public void print(PrintStream out) {

        out.print("(" + opNames[op] + " ");

        if (type.isType(TC_ERROR)) {

            left.print(out);

        } else {

            out.print(type);

        }

        out.print(" ");

        right.print(out);

        out.print(")");

    }

}