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8012337: Change Whitebox implementation to make absence of method in Whitebox.class not fatal

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Reviewed-by: kvn, vlivanov
This commit is contained in:
Igor Ignatyev 2013-04-25 11:04:36 -07:00
parent f26c1a6c88
commit 5733943877
2 changed files with 80 additions and 2 deletions
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24
hotspot/src/share/vm/prims/whitebox.cpp
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@ -436,9 +436,29 @@ JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
Handle loader(ikh->class_loader());
if (loader.is_null()) {
ResourceMark rm;
ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0]));
if (result == 0) {
bool result = true;
// one by one registration natives for exception catching
jclass exceptionKlass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
for (int i = 0, n = sizeof(methods) / sizeof(methods[0]); i < n; ++i) {
if (env->RegisterNatives(wbclass, methods + i, 1) != 0) {
result = false;
if (env->ExceptionCheck() && env->IsInstanceOf(env->ExceptionOccurred(), exceptionKlass)) {
// j.l.NoSuchMethodError is thrown when a method can't be found or a method is not native
// ignoring the exception
tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s", methods[i].name, methods[i].signature);
env->ExceptionClear();
} else {
// register is failed w/o exception or w/ unexpected exception
tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered", methods[i].name, methods[i].signature);
env->UnregisterNatives(wbclass);
break;
}
}
}
if (result) {
WhiteBox::set_used();
}
}