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/*
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* Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.tools.tree;
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import sun.tools.java.*;
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import sun.tools.asm.Assembler;
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import sun.tools.asm.Label;
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import sun.tools.asm.TryData;
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import sun.tools.asm.CatchData;
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import java.io.PrintStream;
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import java.util.Hashtable;
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/**
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* WARNING: The contents of this source file are not part of any
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* supported API. Code that depends on them does so at its own risk:
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* they are subject to change or removal without notice.
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*/
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public
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class SynchronizedStatement extends Statement {
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Expression expr;
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Statement body;
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boolean needReturnSlot; // set by inner return statement
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/**
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* Constructor
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*/
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public SynchronizedStatement(long where, Expression expr, Statement body) {
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super(SYNCHRONIZED, where);
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this.expr = expr;
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this.body = body;
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}
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/**
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* Check statement
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*/
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Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
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checkLabel(env, ctx);
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CheckContext newctx = new CheckContext(ctx, this);
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vset = reach(env, vset);
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vset = expr.checkValue(env, newctx, vset, exp);
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if (expr.type.equals(Type.tNull)) {
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env.error(expr.where, "synchronized.null");
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}
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expr = convert(env, newctx, Type.tClass(idJavaLangObject), expr);
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vset = body.check(env, newctx, vset, exp);
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return ctx.removeAdditionalVars(vset.join(newctx.vsBreak));
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}
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/**
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* Inline
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*/
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public Statement inline(Environment env, Context ctx) {
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if (body != null) {
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body = body.inline(env, ctx);
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}
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expr = expr.inlineValue(env, ctx);
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return this;
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}
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/**
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* Create a copy of the statement for method inlining
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*/
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public Statement copyInline(Context ctx, boolean valNeeded) {
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SynchronizedStatement s = (SynchronizedStatement)clone();
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s.expr = expr.copyInline(ctx);
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if (body != null) {
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s.body = body.copyInline(ctx, valNeeded);
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}
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return s;
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}
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/**
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* Compute cost of inlining this statement
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*/
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public int costInline(int thresh, Environment env, Context ctx){
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int cost = 1;
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if (expr != null) {
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cost += expr.costInline(thresh, env,ctx);
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if (cost >= thresh) return cost;
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}
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if (body != null) {
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cost += body.costInline(thresh, env,ctx);
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}
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return cost;
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}
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/**
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* Code
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*/
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public void code(Environment env, Context ctx, Assembler asm) {
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ClassDefinition clazz = ctx.field.getClassDefinition();
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expr.codeValue(env, ctx, asm);
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ctx = new Context(ctx);
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if (needReturnSlot) {
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Type returnType = ctx.field.getType().getReturnType();
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LocalMember localfield = new LocalMember(0, clazz, 0, returnType,
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idFinallyReturnValue);
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ctx.declare(env, localfield);
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env.debugOutput("Assigning return slot to " + localfield.number);
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}
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LocalMember f1 = new LocalMember(where, clazz, 0, Type.tObject, null);
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LocalMember f2 = new LocalMember(where, clazz, 0, Type.tInt, null);
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Integer num1 = new Integer(ctx.declare(env, f1));
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Integer num2 = new Integer(ctx.declare(env, f2));
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Label endLabel = new Label();
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TryData td = new TryData();
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td.add(null);
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// lock the object
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asm.add(where, opc_astore, num1);
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asm.add(where, opc_aload, num1);
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asm.add(where, opc_monitorenter);
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// Main body
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CodeContext bodyctx = new CodeContext(ctx, this);
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asm.add(where, opc_try, td);
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if (body != null) {
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body.code(env, bodyctx, asm);
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} else {
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asm.add(where, opc_nop);
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}
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asm.add(bodyctx.breakLabel);
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asm.add(td.getEndLabel());
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// Cleanup afer body
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asm.add(where, opc_aload, num1);
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asm.add(where, opc_monitorexit);
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asm.add(where, opc_goto, endLabel);
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// Catch code
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CatchData cd = td.getCatch(0);
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asm.add(cd.getLabel());
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asm.add(where, opc_aload, num1);
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asm.add(where, opc_monitorexit);
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asm.add(where, opc_athrow);
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// Final body
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asm.add(bodyctx.contLabel);
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asm.add(where, opc_astore, num2);
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asm.add(where, opc_aload, num1);
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asm.add(where, opc_monitorexit);
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asm.add(where, opc_ret, num2);
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asm.add(endLabel);
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}
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/**
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* Print
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*/
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public void print(PrintStream out, int indent) {
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super.print(out, indent);
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out.print("synchronized ");
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expr.print(out);
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out.print(" ");
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if (body != null) {
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body.print(out, indent);
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} else {
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out.print("{}");
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}
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}
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}
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