Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/HelloWorld.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/HelloWorld.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,117 @@ +/* + * Copyright 2000-2001 Sun Microsystems, Inc. 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. + * + * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +package sun.jvm.hotspot; + +import java.lang.reflect.*; + +public class HelloWorld { + private static String helloWorldString = "Hello, world!"; + private static volatile int helloWorldTrigger = 0; + private static final boolean useMethodInvoke = false; + private static Object lock = new Object(); + + public static void main(String[] args) { + int foo = a(); + + System.out.println("HelloWorld exiting. a() = " + foo); + } + + private static int a() { + return 1 + b(); + } + + private static int b() { + return 1 + c(); + } + + private static int c() { + return 1 + d("Hi"); + } + + private static int d(String x) { + System.out.println("HelloWorld.d() received \"" + x + "\" as argument"); + synchronized(lock) { + if (useMethodInvoke) { + try { + Method method = HelloWorld.class.getMethod("e", null); + Integer result = (Integer) method.invoke(null, new Object[0]); + return result.intValue(); + } + catch (Exception e) { + throw new RuntimeException(e.toString()); + } + } else { + + int i = fib(10); // 89 + long l = i; + float f = i; + double d = i; + char c = (char) i; + short s = (short) i; + byte b = (byte) i; + + int ret = e(); + + System.out.println("Tenth Fibonacci number in all formats: " + + i + ", " + + l + ", " + + f + ", " + + d + ", " + + c + ", " + + s + ", " + + b); + + return ret; + } + } + } + + public static int e() { + System.out.println("Going to sleep..."); + + int i = 0; + + while (helloWorldTrigger == 0) { + if (++i == 1000000) { + System.gc(); + } + } + + System.out.println(helloWorldString); + + while (helloWorldTrigger != 0) { + } + + return i; + } + + // Tree-recursive implementation for test + public static int fib(int n) { + if (n < 2) { + return 1; + } + return fib(n - 1) + fib(n - 2); + } +}