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 | } | ||