/* * Copyright (c) 1994, 2003, 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. */publicclass 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 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);            env.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 = new Integer(ctx.declare(env, f1));        Integer num2 = new Integer(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("{}");        }    }}