/* * 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. */publicclass ContinueStatement extends Statement {    Identifier lbl;     /**     * Constructor     */    public ContinueStatement(long where, Identifier lbl) {        super(CONTINUE, where);        this.lbl = lbl;    }     /**     * Check statement     */     Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {        checkLabel(env, ctx);        reach(env, vset);        // A new context is established here because the 'continue' statement        // itself may be labelled, however erroneously.  A 'CheckContext' must        // be used here, as 'getContinueContext' is expected to return one.        CheckContext destctx = (CheckContext)new CheckContext(ctx, this).getContinueContext(lbl);        if (destctx != null) {            switch (destctx.node.op) {              case FOR:              case DO:              case WHILE:                if (destctx.frameNumber != ctx.frameNumber) {                    env.error(where, "branch.to.uplevel", lbl);                }                destctx.vsContinue = destctx.vsContinue.join(vset);                break;              default:                env.error(where, "invalid.continue");            }        } else {            if (lbl != null) {                env.error(where, "label.not.found", lbl);            } else {                env.error(where, "invalid.continue");            }        }        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 destctx = (CodeContext)ctx.getContinueContext(lbl);        codeFinally(env, ctx, asm, destctx, null);        asm.add(where, opc_goto, destctx.contLabel);    }     /**     * Print     */    public void print(PrintStream out, int indent) {        super.print(out, indent);        out.print("continue");        if (lbl != null) {            out.print(" " + lbl);        }        out.print(";");    }}