/*

 * 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 BreakStatement extends Statement {

    Identifier lbl;

    /**

     * Constructor

     */

    public BreakStatement(long where, Identifier lbl) {

        super(BREAK, where);

        this.lbl = lbl;

    }

    /**

     * Check statement

     */

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

        reach(env, vset);

        checkLabel(env, ctx);

        CheckContext destctx = (CheckContext)new CheckContext(ctx, this).getBreakContext(lbl);

        if (destctx != null) {

            if (destctx.frameNumber != ctx.frameNumber) {

                env.error(where, "branch.to.uplevel", lbl);

            }

            destctx.vsBreak = destctx.vsBreak.join(vset);

        } else {

            if (lbl != null) {

                env.error(where, "label.not.found", lbl);

            } else {

                env.error(where, "invalid.break");

            }

        }

        CheckContext exitctx = ctx.getTryExitContext();

        if (exitctx != null) {

            exitctx.vsTryExit = exitctx.vsTryExit.join(vset);

        }

        return DEAD_END;

    }

    /**

     * The cost of inlining this statement

     */

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

        return 1;

    }

    /**

     * Code

     */

    public void code(Environment env, Context ctx, Assembler asm) {

        CodeContext newctx = new CodeContext(ctx, this);

        CodeContext destctx = (CodeContext)newctx.getBreakContext(lbl);

        codeFinally(env, ctx, asm, destctx, null);

        asm.add(where, opc_goto, destctx.breakLabel);

        asm.add(newctx.breakLabel);

    }

    /**

     * Print

     */

    public void print(PrintStream out, int indent) {

        super.print(out, indent);

        out.print("break");

        if (lbl != null) {

            out.print(" " + lbl);

        }

        out.print(";");

    }

}