160 lines
4.5 KiB
Java
160 lines
4.5 KiB
Java
/*
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* Unit tests for JVMTI IterateOverReachableObjects and
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* IterateOverObjectsReachableFromObject functions.
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*
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*/
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package nsk.jvmti.unit.heap;
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import nsk.share.jvmti.unit.*;
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import java.io.PrintStream;
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public class HeapWalkTests {
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final static int JCK_STATUS_BASE = 95;
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final static int PASSED = 0;
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final static int FAILED = 2;
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public static void main(String args[]) {
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args = nsk.share.jvmti.JVMTITest.commonInit(args);
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// produce JCK-like exit status.
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System.exit(run(args, System.out) + JCK_STATUS_BASE);
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}
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public static int run(String args[], PrintStream out) {
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test1();
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test2();
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test3();
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return PASSED;
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}
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private static void test1() {
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long tag;
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// This test uses the heap_root_callback to tag all the roots
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// It then examines a few known roots and checks that they
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// are tagged.
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// create a global reference
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Object o = new Object();
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Heap.newGlobalRef(o);
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// make sure current thread isn't tagged
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Heap.setTag(Thread.currentThread(), 0);
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Heap.setHeapRootCallback();
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Heap.iterateOverReachableObjects();
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// o must be JNI global - there's no other way it can be a root
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tag = Heap.getTag(o);
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if (tag != Heap.JVMTI_HEAP_ROOT_JNI_GLOBAL) {
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throw new RuntimeException("JNI global should have been tagged");
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}
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// Current thread is root but can't assume it will be
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// tagged with JVMTI_HEAP_ROOT_JNI_GLOBAL
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tag = Heap.getTag(Thread.currentThread());
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if (tag == 0) {
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throw new RuntimeException("Current thread isn't tagged");
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}
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}
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private static void test2() {
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long tag;
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// This test uses the stack_ref_callback to tag all references
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// from the thread stacks. The callback tags all objects with the tag
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// of the thread.
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Object o = new Object();
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Heap.setTag(Thread.currentThread(), 888);
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Heap.setStackRefCallback();
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Heap.iterateOverReachableObjects();
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tag = Heap.getTag(o);
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if (tag != 888) {
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throw new RuntimeException("stack local not tagged correctly");
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}
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}
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// used by test3
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static class Foo {
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private Object fld;
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Foo() {
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fld = new Object();
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}
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Object field() {
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return fld;
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}
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public static Object static_field = new Object();
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}
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private static int failures = 0;
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private static void check(Object o, long tag) {
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long actual_tag = Heap.getTag(o);
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if (actual_tag != tag) {
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if (actual_tag == 0) {
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System.err.println(o + " is not tagged!");
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} else {
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System.err.println(o + " is incorrectly tagged");
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}
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failures++;
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}
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}
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private static void test3() {
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long tag;
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// This test tags an object, and then calls IterateOverObjectsReachableFromObject
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// The callback tags all objects with a tag value of 777.
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Foo foo = new Foo();
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Heap.setObjectRefCallback();
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Heap.iterateOverObjectsReachableFromObject(foo);
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check(Foo.class, 777);
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check(Foo.static_field, 777);
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check(foo.field(), 777);
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if (failures > 0) {
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throw new RuntimeException("IterateOverObjectsReachableFromObject test failed");
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}
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}
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}
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