8012337: Change Whitebox implementation to make absence of method in Whitebox.class not fatal
Reviewed-by: kvn, vlivanov
--- a/hotspot/src/share/vm/prims/whitebox.cpp Thu Apr 25 11:02:32 2013 -0700
+++ b/hotspot/src/share/vm/prims/whitebox.cpp Thu Apr 25 11:04:36 2013 -0700
@@ -436,9 +436,29 @@
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();
}
}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/sanity/WhiteBox.java Thu Apr 25 11:04:36 2013 -0700
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test WhiteBox
+ * @bug 8011675
+ * @summary verify that whitebox can be used even if not all functions are declared in java-part
+ * @author igor.ignatyev@oracle.com
+ * @library /testlibrary
+ * @compile WhiteBox.java
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI sun.hotspot.WhiteBox
+ * @clean sun.hotspot.WhiteBox
+ */
+
+package sun.hotspot;
+
+public class WhiteBox {
+ private static native void registerNatives();
+ static { registerNatives(); }
+ public native int notExistedMethod();
+ public native int getHeapOopSize();
+ public static void main(String[] args) {
+ WhiteBox wb = new WhiteBox();
+ if (wb.getHeapOopSize() < 0) {
+ throw new Error("wb.getHeapOopSize() < 0");
+ }
+ boolean catched = false;
+ try {
+ wb.notExistedMethod();
+ } catch (UnsatisfiedLinkError e) {
+ catched = true;
+ }
+ if (!catched) {
+ throw new Error("wb.notExistedMethod() was invoked");
+ }
+ }
+}