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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 | } | ||