Mercurial > hg > truffle
view test/compiler/6894807/IsInstanceTest.java @ 11825:463f51256c86
AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry
for empty methods we emitted something like this if a inline cache is needed:
prefix:
00: < IC check >
...
0b: jne <ic_miss_call>
11: nop
...
verified_entry:
20: ret
ic_miss_call:
21: jmp <entry of runtime function>
when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a
jump to a stub that handles call-sites that has been made non-entrant. since this jump
is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that
calls this method via the unverified entry (prefix).
the fix is to emit the jump to the runtime function inside the unverfied entry:
prefix:
00: < IC check >
...
0b: je <verified_entry>
11: jeq <entry of runtime function>
16: nop
...
verified_entry:
20: ret
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Mon, 30 Sep 2013 09:32:18 +0200 |
parents | 495caa35b1b5 |
children |
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line source
/* * @test * @bug 6894807 * @summary No ClassCastException for HashAttributeSet constructors if run with -Xcomp * @compile IsInstanceTest.java * @run shell Test6894807.sh */ public class IsInstanceTest { public static void main(String[] args) { BaseInterface baseInterfaceImpl = new BaseInterfaceImpl(); for (int i = 0; i < 100000; i++) { if (isInstanceOf(baseInterfaceImpl, ExtendedInterface.class)) { System.out.println("Failed at index:" + i); System.out.println("Arch: "+System.getProperty("os.arch", "")+ " OS: "+System.getProperty("os.name", "")+ " OSV: "+System.getProperty("os.version", "")+ " Cores: "+Runtime.getRuntime().availableProcessors()+ " JVM: "+System.getProperty("java.version", "")+" "+System.getProperty("sun.arch.data.model", "")); break; } } System.out.println("Done!"); } public static boolean isInstanceOf(BaseInterface baseInterfaceImpl, Class... baseInterfaceClasses) { for (Class baseInterfaceClass : baseInterfaceClasses) { if (baseInterfaceClass.isInstance(baseInterfaceImpl)) { return true; } } return false; } private interface BaseInterface { } private interface ExtendedInterface extends BaseInterface { } private static class BaseInterfaceImpl implements BaseInterface { } }