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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 sun.tools.asm.TryData; | |
| 32 | +import sun.tools.asm.CatchData; | |
| 33 | +import java.io.PrintStream; | |
| 34 | +import java.util.Hashtable; | |
| 35 | + | |
| 36 | +/** | |
| 37 | + * WARNING: The contents of this source file are not part of any | |
| 38 | + * supported API. Code that depends on them does so at its own risk: | |
| 39 | + * they are subject to change or removal without notice. | |
| 40 | + */ | |
| 41 | +public | |
| 42 | +class SynchronizedStatement extends Statement { | |
| 43 | + Expression expr; | |
| 44 | + Statement body; | |
| 45 | + boolean needReturnSlot; // set by inner return statement | |
| 46 | + | |
| 47 | + /** | |
| 48 | + * Constructor | |
| 49 | + */ | |
| 50 | + public SynchronizedStatement(long where, Expression expr, Statement body) { | |
| 51 | + super(SYNCHRONIZED, where); | |
| 52 | + this.expr = expr; | |
| 53 | + this.body = body; | |
| 54 | + } | |
| 55 | + | |
| 56 | + /** | |
| 57 | + * Check statement | |
| 58 | + */ | |
| 59 | + Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { | |
| 60 | + checkLabel(env, ctx); | |
| 61 | + CheckContext newctx = new CheckContext(ctx, this); | |
| 62 | + vset = reach(env, vset); | |
| 63 | + vset = expr.checkValue(env, newctx, vset, exp); | |
| 64 | + if (expr.type.equals(Type.tNull)) { | |
| 65 | + env.error(expr.where, "synchronized.null"); | |
| 66 | + } | |
| 67 | + expr = convert(env, newctx, Type.tClass(idJavaLangObject), expr); | |
| 68 | + vset = body.check(env, newctx, vset, exp); | |
| 69 | + return ctx.removeAdditionalVars(vset.join(newctx.vsBreak)); | |
| 70 | + } | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * Inline | |
| 74 | + */ | |
| 75 | + public Statement inline(Environment env, Context ctx) { | |
| 76 | + if (body != null) { | |
| 77 | + body = body.inline(env, ctx); | |
| 78 | + } | |
| 79 | + expr = expr.inlineValue(env, ctx); | |
| 80 | + return this; | |
| 81 | + } | |
| 82 | + | |
| 83 | + /** | |
| 84 | + * Create a copy of the statement for method inlining | |
| 85 | + */ | |
| 86 | + public Statement copyInline(Context ctx, boolean valNeeded) { | |
| 87 | + SynchronizedStatement s = (SynchronizedStatement)clone(); | |
| 88 | + s.expr = expr.copyInline(ctx); | |
| 89 | + if (body != null) { | |
| 90 | + s.body = body.copyInline(ctx, valNeeded); | |
| 91 | + } | |
| 92 | + return s; | |
| 93 | + } | |
| 94 | + | |
| 95 | + /** | |
| 96 | + * Compute cost of inlining this statement | |
| 97 | + */ | |
| 98 | + public int costInline(int thresh, Environment env, Context ctx){ | |
| 99 | + int cost = 1; | |
| 100 | + if (expr != null) { | |
| 101 | + cost += expr.costInline(thresh, env,ctx); | |
| 102 | + if (cost >= thresh) return cost; | |
| 103 | + } | |
| 104 | + if (body != null) { | |
| 105 | + cost += body.costInline(thresh, env,ctx); | |
| 106 | + } | |
| 107 | + return cost; | |
| 108 | + } | |
| 109 | + | |
| 110 | + /** | |
| 111 | + * Code | |
| 112 | + */ | |
| 113 | + public void code(Environment env, Context ctx, Assembler asm) { | |
| 114 | + ClassDefinition clazz = ctx.field.getClassDefinition(); | |
| 115 | + expr.codeValue(env, ctx, asm); | |
| 116 | + ctx = new Context(ctx); | |
| 117 | + | |
| 118 | + if (needReturnSlot) { | |
| 119 | + Type returnType = ctx.field.getType().getReturnType(); | |
| 120 | + LocalMember localfield = new LocalMember(0, clazz, 0, returnType, | |
| 121 | + idFinallyReturnValue); | |
| 122 | + ctx.declare(env, localfield); | |
| 123 | + env.debugOutput("Assigning return slot to " + localfield.number); | |
| 124 | + } | |
| 125 | + | |
| 126 | + LocalMember f1 = new LocalMember(where, clazz, 0, Type.tObject, null); | |
| 127 | + LocalMember f2 = new LocalMember(where, clazz, 0, Type.tInt, null); | |
| 128 | + Integer num1 = new Integer(ctx.declare(env, f1)); | |
| 129 | + Integer num2 = new Integer(ctx.declare(env, f2)); | |
| 130 | + | |
| 131 | + Label endLabel = new Label(); | |
| 132 | + | |
| 133 | + TryData td = new TryData(); | |
| 134 | + td.add(null); | |
| 135 | + | |
| 136 | + // lock the object | |
| 137 | + asm.add(where, opc_astore, num1); | |
| 138 | + asm.add(where, opc_aload, num1); | |
| 139 | + asm.add(where, opc_monitorenter); | |
| 140 | + | |
| 141 | + // Main body | |
| 142 | + CodeContext bodyctx = new CodeContext(ctx, this); | |
| 143 | + asm.add(where, opc_try, td); | |
| 144 | + if (body != null) { | |
| 145 | + body.code(env, bodyctx, asm); | |
| 146 | + } else { | |
| 147 | + asm.add(where, opc_nop); | |
| 148 | + } | |
| 149 | + asm.add(bodyctx.breakLabel); | |
| 150 | + asm.add(td.getEndLabel()); | |
| 151 | + | |
| 152 | + // Cleanup afer body | |
| 153 | + asm.add(where, opc_aload, num1); | |
| 154 | + asm.add(where, opc_monitorexit); | |
| 155 | + asm.add(where, opc_goto, endLabel); | |
| 156 | + | |
| 157 | + // Catch code | |
| 158 | + CatchData cd = td.getCatch(0); | |
| 159 | + asm.add(cd.getLabel()); | |
| 160 | + asm.add(where, opc_aload, num1); | |
| 161 | + asm.add(where, opc_monitorexit); | |
| 162 | + asm.add(where, opc_athrow); | |
| 163 | + | |
| 164 | + // Final body | |
| 165 | + asm.add(bodyctx.contLabel); | |
| 166 | + asm.add(where, opc_astore, num2); | |
| 167 | + asm.add(where, opc_aload, num1); | |
| 168 | + asm.add(where, opc_monitorexit); | |
| 169 | + asm.add(where, opc_ret, num2); | |
| 170 | + | |
| 171 | + asm.add(endLabel); | |
| 172 | + } | |
| 173 | + | |
| 174 | + /** | |
| 175 | ||
| 176 | + */ | |
| 177 | + public void print(PrintStream out, int indent) { | |
| 178 | + super.print(out, indent); | |
| 179 | + out.print("synchronized "); | |
| 180 | + expr.print(out); | |
| 181 | + out.print(" "); | |
| 182 | + if (body != null) { | |
| 183 | + body.print(out, indent); | |
| 184 | + } else { | |
| 185 | + out.print("{}"); | |
| 186 | + } | |
| 187 | + } | |
| 188 | +} | |