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/*
* Copyright (c) 2006, 2018, 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.
*/
package nsk.share.jdi;
import java.util.*;
import com.sun.jdi.*;
import nsk.share.TestBug;
/*
* Debugger class used in tests for heapwalking(tests for VirtualMachine.instanceCounts, ReferenceType.instances, ObjectReference.referrers)
* Contains several common checking and auxiliary methods.
*/
public class HeapwalkingDebugger extends TestDebuggerType2 {
// instances of some classes couldn't be strictly controlled during test execution, use non-strict checks for this classes
protected boolean strictCheck(String className) {
boolean otherThreadPresent = isJFR_active();
return HeapwalkingDebuggee.useStrictCheck(className, otherThreadPresent);
}
// wrapper for VirtualMachine.instanceCounts
public long getInstanceCount(String className) {
List<ReferenceType> list = vm.classesByName(className);
if (list.size() == 0)
return 0;
if (list.size() > 1) {
setSuccess(false);
log.complain("Unexpected collection size returned by VirtualMachine.classesByName(" + className + "): " + list.size()
+ ", only 1 entry was expected.");
}
long result[] = (vm.instanceCounts(list));
return result[0];
}
// tests that vm.instanceCounts(vm.allClasses()) doesn't throws any exceptions
protected void testInstanceCounts() {
try {
vm.instanceCounts(vm.allClasses());
} catch (Throwable t) {
setSuccess(false);
log.complain("Unexpected exception: " + t);
t.printStackTrace(log.getOutStream());
}
}
// check size of list returned by ReferenceType.instances
protected void checkDebugeeAnswer_instances(String className, int expectedCount) {
ReferenceType referenceType = debuggee.classByName(className);
int instanceCounts = referenceType.instances(0).size();
if (strictCheck(className)) {
if (referenceType.instances(0).size() != expectedCount) {
setSuccess(false);
log.complain("Unexpected size of referenceType.instances(" + className + "): " + instanceCounts + ", expected: " + expectedCount);
}
} else {
if (referenceType.instances(0).size() < expectedCount) {
setSuccess(false);
log.complain("Unexpected size of referenceType.instances(" + className + "): " + instanceCounts + ", expected: >= " + expectedCount);
}
}
}
// check value returned by VirtualMachine.instanceCounts,
// note that method call method isDebuggeeReady() which check that debuggee completed pervious command and is ready for new one
public void checkDebugeeAnswer_instanceCounts(String className, int expectedValue) {
if (!isDebuggeeReady())
return;
try {
long instanceCounts = getInstanceCount(className);
if (strictCheck(className)) {
if (instanceCounts != expectedValue) {
setSuccess(false);
log.complain("Wrong value was returned by VirtualMachine.instanceCounts(" + className + "): " + instanceCounts + ", expected: "
+ expectedValue);
}
} else {
if (instanceCounts < expectedValue) {
setSuccess(false);
log.complain("Wrong value was returned by VirtualMachine.instanceCounts(" + className + "): " + instanceCounts
+ ", expected: >= " + expectedValue);
}
}
} catch (Throwable e) {
setSuccess(false);
log.complain("Unexpected exception when getting instance count info:");
e.printStackTrace(log.getOutStream());
}
}
// Verifies number of instances of a class.
// Two types of checks are done:
// 1. Current instances >= old instances + created instances.
// 2. New instances >= created instances.
//
// The check in case 1 can only be done for classes where the test controls
// all created and deleted instances.
// Other classes, like java.lang.String, can not make this check since
// an instance in "old instances" may have been removed by a GC.
// In that case the tetst would fail because it finds too few current instances.
public void checkDebugeeAnswer_instanceCounts(String className, int countCreated, List<ObjectReference> oldReferences) {
if (strictCheck(className)) {
int countAll = countCreated + oldReferences.size();
checkDebugeeAnswer_instanceCounts(className, countAll);
checkDebugeeAnswer_instances(className, countAll);
} else {
// isDebuggeeReady() check is hidden in checkDebugeeAnswer_instanceCounts() above.
// Must call it separately if we don't call checkDebugeeAnswer_instanceCounts().
if (!isDebuggeeReady()) {
return;
}
}
// Verify number of new instances created.
int countFoundCreated = countNewInstances(className, oldReferences);
if (countFoundCreated < countCreated) {
setSuccess(false);
log.complain("Too few new instances(" + className + "). Expected >= " + countCreated + ", found " + countFoundCreated);
}
}
private int countNewInstances(String className, List<ObjectReference> oldReferences) {
// New references = current references - old references.
List<ObjectReference> newReferences = new ArrayList<ObjectReference>(getObjectReferences(className, vm));
newReferences.removeAll(oldReferences);
return newReferences.size();
}
// check value returned by InterfaceType.instances
protected void checkDebugeeAnswer_InterfaceType_instances(InterfaceType interfaceType, int expectedInstances) {
int instanceCounts = interfaceType.instances(0).size();
if (instanceCounts != expectedInstances) {
setSuccess(false);
log.complain("List with wrong size was returned by InterfaceType.instances(" + interfaceType.name() + "): " + instanceCounts
+ ", expected: " + expectedInstances);
}
}
static public List<ObjectReference> filterObjectReferrence(List<ObjectReference> objectsToFilter, List<ObjectReference> sourceList) {
List<ObjectReference> result = new ArrayList<ObjectReference>();
for (ObjectReference object : sourceList) {
if (!objectsToFilter.contains(object))
result.add(object);
}
return result;
}
static public List<ObjectReference> getObjectReferences(String className, VirtualMachine vm) {
List<ReferenceType> referenceTypes = vm.classesByName(className);
List<ObjectReference> objectReferences;
if (referenceTypes.size() == 0)
objectReferences = new ArrayList<ObjectReference>();
else if (referenceTypes.size() == 1)
objectReferences = referenceTypes.get(0).instances(0);
else {
throw new TestBug("Unexpected collection size returned by VirtualMachine.classesByName: " + referenceTypes.size()
+ ", only 1 entry was expected.");
}
return objectReferences;
}
}
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