Showing the changes to java/pkg/sun/tools/tree/ContinueStatement.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.tools.tree; | |
| 27 | + | |
| 28 | +import sun.tools.java.*; | |
| 29 | +import sun.tools.asm.Assembler; | |
| 30 | +import sun.tools.asm.Label; | |
| 31 | +import java.io.PrintStream; | |
| 32 | +import java.util.Hashtable; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * WARNING: The contents of this source file are not part of any | |
| 36 | + * supported API. Code that depends on them does so at its own risk: | |
| 37 | + * they are subject to change or removal without notice. | |
| 38 | + */ | |
| 39 | +public | |
| 40 | +class ContinueStatement extends Statement { | |
| 41 | + Identifier lbl; | |
| 42 | + | |
| 43 | + /** | |
| 44 | + * Constructor | |
| 45 | + */ | |
| 46 | + public ContinueStatement(long where, Identifier lbl) { | |
| 47 | + super(CONTINUE, where); | |
| 48 | + this.lbl = lbl; | |
| 49 | + } | |
| 50 | + | |
| 51 | + /** | |
| 52 | + * Check statement | |
| 53 | + */ | |
| 54 | + | |
| 55 | + Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { | |
| 56 | + checkLabel(env, ctx); | |
| 57 | + reach(env, vset); | |
| 58 | + // A new context is established here because the 'continue' statement | |
| 59 | + // itself may be labelled, however erroneously. A 'CheckContext' must | |
| 60 | + // be used here, as 'getContinueContext' is expected to return one. | |
| 61 | + CheckContext destctx = (CheckContext)new CheckContext(ctx, this).getContinueContext(lbl); | |
| 62 | + if (destctx != null) { | |
| 63 | + switch (destctx.node.op) { | |
| 64 | + case FOR: | |
| 65 | + case DO: | |
| 66 | + case WHILE: | |
| 67 | + if (destctx.frameNumber != ctx.frameNumber) { | |
| 68 | + env.error(where, "branch.to.uplevel", lbl); | |
| 69 | + } | |
| 70 | + destctx.vsContinue = destctx.vsContinue.join(vset); | |
| 71 | + break; | |
| 72 | + default: | |
| 73 | + env.error(where, "invalid.continue"); | |
| 74 | + } | |
| 75 | + } else { | |
| 76 | + if (lbl != null) { | |
| 77 | + env.error(where, "label.not.found", lbl); | |
| 78 | + } else { | |
| 79 | + env.error(where, "invalid.continue"); | |
| 80 | + } | |
| 81 | + } | |
| 82 | + CheckContext exitctx = ctx.getTryExitContext(); | |
| 83 | + if (exitctx != null) { | |
| 84 | + exitctx.vsTryExit = exitctx.vsTryExit.join(vset); | |
| 85 | + } | |
| 86 | + return DEAD_END; | |
| 87 | + } | |
| 88 | + | |
| 89 | + /** | |
| 90 | + * The cost of inlining this statement | |
| 91 | + */ | |
| 92 | + public int costInline(int thresh, Environment env, Context ctx) { | |
| 93 | + return 1; | |
| 94 | + } | |
| 95 | + | |
| 96 | + /** | |
| 97 | + * Code | |
| 98 | + */ | |
| 99 | + public void code(Environment env, Context ctx, Assembler asm) { | |
| 100 | + CodeContext destctx = (CodeContext)ctx.getContinueContext(lbl); | |
| 101 | + codeFinally(env, ctx, asm, destctx, null); | |
| 102 | + asm.add(where, opc_goto, destctx.contLabel); | |
| 103 | + } | |
| 104 | + | |
| 105 | + /** | |
| 106 | ||
| 107 | + */ | |
| 108 | + public void print(PrintStream out, int indent) { | |
| 109 | + super.print(out, indent); | |
| 110 | + out.print("continue"); | |
| 111 | + if (lbl != null) { | |
| 112 | + out.print(" " + lbl); | |
| 113 | + } | |
| 114 | + out.print(";"); | |
| 115 | + } | |
| 116 | +} | |