| /* |
| * 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 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(";"); |
| } |
| } |