| /* |
| * Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.tools.tree; |
| |
| import sun.tools.java.*; |
| import sun.tools.asm.Assembler; |
| import sun.tools.asm.Label; |
| import sun.tools.asm.TryData; |
| import sun.tools.asm.CatchData; |
| import java.io.PrintStream; |
| import java.util.Hashtable; |
| |
| /** |
| * WARNING: The contents of this source file are not part of any |
| * supported API. Code that depends on them does so at its own risk: |
| * they are subject to change or removal without notice. |
| */ |
| public |
| class SynchronizedStatement extends Statement { |
| Expression expr; |
| Statement body; |
| boolean needReturnSlot; // set by inner return statement |
| |
| /** |
| * Constructor |
| */ |
| public SynchronizedStatement(long where, Expression expr, Statement body) { |
| super(SYNCHRONIZED, where); |
| this.expr = expr; |
| this.body = body; |
| } |
| |
| /** |
| * Check statement |
| */ |
| Vset check(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp) { |
| checkLabel(env, ctx); |
| CheckContext newctx = new CheckContext(ctx, this); |
| vset = reach(env, vset); |
| vset = expr.checkValue(env, newctx, vset, exp); |
| if (expr.type.equals(Type.tNull)) { |
| env.error(expr.where, "synchronized.null"); |
| } |
| expr = convert(env, newctx, Type.tClass(idJavaLangObject), expr); |
| vset = body.check(env, newctx, vset, exp); |
| return ctx.removeAdditionalVars(vset.join(newctx.vsBreak)); |
| } |
| |
| /** |
| * Inline |
| */ |
| public Statement inline(Environment env, Context ctx) { |
| if (body != null) { |
| body = body.inline(env, ctx); |
| } |
| expr = expr.inlineValue(env, ctx); |
| return this; |
| } |
| |
| /** |
| * Create a copy of the statement for method inlining |
| */ |
| public Statement copyInline(Context ctx, boolean valNeeded) { |
| SynchronizedStatement s = (SynchronizedStatement)clone(); |
| s.expr = expr.copyInline(ctx); |
| if (body != null) { |
| s.body = body.copyInline(ctx, valNeeded); |
| } |
| return s; |
| } |
| |
| /** |
| * Compute cost of inlining this statement |
| */ |
| public int costInline(int thresh, Environment env, Context ctx){ |
| int cost = 1; |
| if (expr != null) { |
| cost += expr.costInline(thresh, env,ctx); |
| if (cost >= thresh) return cost; |
| } |
| if (body != null) { |
| cost += body.costInline(thresh, env,ctx); |
| } |
| return cost; |
| } |
| |
| /** |
| * Code |
| */ |
| public void code(Environment env, Context ctx, Assembler asm) { |
| ClassDefinition clazz = ctx.field.getClassDefinition(); |
| expr.codeValue(env, ctx, asm); |
| ctx = new Context(ctx); |
| |
| if (needReturnSlot) { |
| Type returnType = ctx.field.getType().getReturnType(); |
| LocalMember localfield = new LocalMember(0, clazz, 0, returnType, |
| idFinallyReturnValue); |
| ctx.declare(env, localfield); |
| Environment.debugOutput("Assigning return slot to " + localfield.number); |
| } |
| |
| LocalMember f1 = new LocalMember(where, clazz, 0, Type.tObject, null); |
| LocalMember f2 = new LocalMember(where, clazz, 0, Type.tInt, null); |
| Integer num1 = ctx.declare(env, f1); |
| Integer num2 = ctx.declare(env, f2); |
| |
| Label endLabel = new Label(); |
| |
| TryData td = new TryData(); |
| td.add(null); |
| |
| // lock the object |
| asm.add(where, opc_astore, num1); |
| asm.add(where, opc_aload, num1); |
| asm.add(where, opc_monitorenter); |
| |
| // Main body |
| CodeContext bodyctx = new CodeContext(ctx, this); |
| asm.add(where, opc_try, td); |
| if (body != null) { |
| body.code(env, bodyctx, asm); |
| } else { |
| asm.add(where, opc_nop); |
| } |
| asm.add(bodyctx.breakLabel); |
| asm.add(td.getEndLabel()); |
| |
| // Cleanup afer body |
| asm.add(where, opc_aload, num1); |
| asm.add(where, opc_monitorexit); |
| asm.add(where, opc_goto, endLabel); |
| |
| // Catch code |
| CatchData cd = td.getCatch(0); |
| asm.add(cd.getLabel()); |
| asm.add(where, opc_aload, num1); |
| asm.add(where, opc_monitorexit); |
| asm.add(where, opc_athrow); |
| |
| // Final body |
| asm.add(bodyctx.contLabel); |
| asm.add(where, opc_astore, num2); |
| asm.add(where, opc_aload, num1); |
| asm.add(where, opc_monitorexit); |
| asm.add(where, opc_ret, num2); |
| |
| asm.add(endLabel); |
| } |
| |
| /** |
| * Print |
| */ |
| public void print(PrintStream out, int indent) { |
| super.print(out, indent); |
| out.print("synchronized "); |
| expr.print(out); |
| out.print(" "); |
| if (body != null) { |
| body.print(out, indent); |
| } else { |
| out.print("{}"); |
| } |
| } |
| } |