Showing the changes to java/pkg/sun/tools/tree/WhileStatement.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 WhileStatement extends Statement { | |
| 41 | + Expression cond; | |
| 42 | + Statement body; | |
| 43 | + | |
| 44 | + /** | |
| 45 | + * Constructor | |
| 46 | + */ | |
| 47 | + public WhileStatement(long where, Expression cond, Statement body) { | |
| 48 | + super(WHILE, where); | |
| 49 | + this.cond = cond; | |
| 50 | + this.body = body; | |
| 51 | + } | |
| 52 | + | |
| 53 | + /** | |
| 54 | + * Check a while statement | |
| 55 | + */ | |
| 56 | + Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { | |
| 57 | + checkLabel(env, ctx); | |
| 58 | + CheckContext newctx = new CheckContext(ctx, this); | |
| 59 | + // remember what was unassigned on entry | |
| 60 | + Vset vsEntry = vset.copy(); | |
| 61 | + // check the condition. Determine which variables have values if | |
| 62 | + // it returns true or false. | |
| 63 | + ConditionVars cvars = | |
| 64 | + cond.checkCondition(env, newctx, reach(env, vset), exp); | |
| 65 | + cond = convert(env, newctx, Type.tBoolean, cond); | |
| 66 | + // check the body, given that the condition returned true. | |
| 67 | + vset = body.check(env, newctx, cvars.vsTrue, exp); | |
| 68 | + vset = vset.join(newctx.vsContinue); | |
| 69 | + // make sure the back-branch fits the entry of the loop | |
| 70 | + ctx.checkBackBranch(env, this, vsEntry, vset); | |
| 71 | + // Exit the while loop by testing false or getting a break statement | |
| 72 | + vset = newctx.vsBreak.join(cvars.vsFalse); | |
| 73 | + return ctx.removeAdditionalVars(vset); | |
| 74 | + } | |
| 75 | + | |
| 76 | + /** | |
| 77 | + * Inline | |
| 78 | + */ | |
| 79 | + public Statement inline(Environment env, Context ctx) { | |
| 80 | + ctx = new Context(ctx, this); | |
| 81 | + cond = cond.inlineValue(env, ctx); | |
| 82 | + if (body != null) { | |
| 83 | + body = body.inline(env, ctx); | |
| 84 | + } | |
| 85 | + return this; | |
| 86 | + } | |
| 87 | + | |
| 88 | + /** | |
| 89 | + * The cost of inlining this statement | |
| 90 | + */ | |
| 91 | + public int costInline(int thresh, Environment env, Context ctx) { | |
| 92 | + return 1 + cond.costInline(thresh, env, ctx) | |
| 93 | + + ((body != null) ? body.costInline(thresh, env, ctx) : 0); | |
| 94 | + } | |
| 95 | + | |
| 96 | + /** | |
| 97 | + * Create a copy of the statement for method inlining | |
| 98 | + */ | |
| 99 | + public Statement copyInline(Context ctx, boolean valNeeded) { | |
| 100 | + WhileStatement s = (WhileStatement)clone(); | |
| 101 | + s.cond = cond.copyInline(ctx); | |
| 102 | + if (body != null) { | |
| 103 | + s.body = body.copyInline(ctx, valNeeded); | |
| 104 | + } | |
| 105 | + return s; | |
| 106 | + } | |
| 107 | + | |
| 108 | + /** | |
| 109 | + * Code | |
| 110 | + */ | |
| 111 | + public void code(Environment env, Context ctx, Assembler asm) { | |
| 112 | + CodeContext newctx = new CodeContext(ctx, this); | |
| 113 | + | |
| 114 | + asm.add(where, opc_goto, newctx.contLabel); | |
| 115 | + | |
| 116 | + Label l1 = new Label(); | |
| 117 | + asm.add(l1); | |
| 118 | + | |
| 119 | + if (body != null) { | |
| 120 | + body.code(env, newctx, asm); | |
| 121 | + } | |
| 122 | + | |
| 123 | + asm.add(newctx.contLabel); | |
| 124 | + cond.codeBranch(env, newctx, asm, l1, true); | |
| 125 | + asm.add(newctx.breakLabel); | |
| 126 | + } | |
| 127 | + | |
| 128 | + /** | |
| 129 | ||
| 130 | + */ | |
| 131 | + public void print(PrintStream out, int indent) { | |
| 132 | + super.print(out, indent); | |
| 133 | + out.print("while "); | |
| 134 | + cond.print(out); | |
| 135 | + if (body != null) { | |
| 136 | + out.print(" "); | |
| 137 | + body.print(out, indent); | |
| 138 | + } else { | |
| 139 | + out.print(";"); | |
| 140 | + } | |
| 141 | + } | |
| 142 | +} | |