878 lines
40 KiB
Java
878 lines
40 KiB
Java
/*
|
|
* Copyright (c) 2017, 2022, 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
|
|
* @bug 8173898
|
|
* @summary Basic test for checking filtering of reflection frames
|
|
* @run testng ReflectionFrames
|
|
*/
|
|
|
|
import java.lang.StackWalker.StackFrame;
|
|
import java.lang.reflect.Constructor;
|
|
import java.lang.reflect.Method;
|
|
import java.lang.invoke.MethodHandle;
|
|
import java.lang.invoke.MethodHandles;
|
|
import java.lang.invoke.MethodHandles.Lookup;
|
|
import java.lang.invoke.MethodType;
|
|
import java.util.EnumSet;
|
|
import java.util.List;
|
|
import java.util.function.Supplier;
|
|
import java.util.stream.Collectors;
|
|
import java.util.stream.Stream;
|
|
import static java.lang.StackWalker.Option.*;
|
|
|
|
import org.testng.annotations.DataProvider;
|
|
import org.testng.annotations.Test;
|
|
import static org.testng.Assert.*;
|
|
|
|
public class ReflectionFrames {
|
|
final static boolean verbose = false;
|
|
final static Class<?> REFLECT_ACCESS = findClass("java.lang.reflect.ReflectAccess");
|
|
final static Class<?> REFLECTION_FACTORY = findClass("jdk.internal.reflect.ReflectionFactory");
|
|
|
|
private static Class<?> findClass(String cn) {
|
|
try {
|
|
return Class.forName(cn);
|
|
} catch (ClassNotFoundException e) {
|
|
throw new AssertionError(e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This test invokes new StackInspector() directly from
|
|
* the caller StackInspector.Caller.create method.
|
|
* It checks that the caller is StackInspector.Caller.
|
|
* It also checks the expected frames collected
|
|
* by walking the stack from the default StackInspector()
|
|
* constructor.
|
|
* This is done twice, once using a default StackWalker
|
|
* that hides reflection frames, once using a StackWalker
|
|
* configured to show reflection frames.
|
|
*/
|
|
@Test
|
|
public static void testNewStackInspector() throws Exception {
|
|
// Sets the default walker which hides reflection
|
|
// frames.
|
|
StackInspector.walker.set(StackInspector.walkerHide);
|
|
|
|
// Calls the StackInspector.create method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The create method invokes new StackInspector() directly.
|
|
// No reflection frame should appear.
|
|
System.out.println("testNewStackInspector: create");
|
|
|
|
StackInspector obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("create", How.class)
|
|
.invoke(null, How.NEW));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewStackInspector"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.reflect method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The reflect method invokes the create method through
|
|
// reflection.
|
|
// The create method invokes new StackInspector() directly.
|
|
// No reflection frame should appear.
|
|
System.out.println("testNewStackInspector: reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("reflect", How.class)
|
|
.invoke(null, How.NEW));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
StackInspector.Caller.class.getName()
|
|
+"::reflect",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewStackInspector"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.handle method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The handle method invokes the create method using
|
|
// a MethodHandle.
|
|
// The create method invokes new StackInspector() directly.
|
|
// No reflection frame should appear.
|
|
System.out.println("testNewStackInspector: handle");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("handle", How.class)
|
|
.invoke(null, How.NEW));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
StackInspector.Caller.class.getName()
|
|
+"::handle",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewStackInspector"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Sets a non-default walker configured to show
|
|
// reflection frames
|
|
StackInspector.walker.set(StackInspector.walkerShow);
|
|
|
|
// Calls the StackInspector.create method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The create method invokes new StackInspector() directly.
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testNewStackInspector: create: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("create", How.class)
|
|
.invoke(null, How.NEW));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewStackInspector"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertNotEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.reflect method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The reflect method invokes the create method through
|
|
// reflection.
|
|
// The create method invokes new StackInspector() directly.
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testNewStackInspector: reflect: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("reflect", How.class)
|
|
.invoke(null, How.NEW));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
StackInspector.Caller.class.getName()
|
|
+"::reflect",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewStackInspector"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertNotEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.handle method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The handle method invokes the create method using
|
|
// MethodHandle.
|
|
// The create method invokes new StackInspector() directly.
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testNewStackInspector: handle: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("handle", How.class)
|
|
.invoke(null, How.NEW));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
// MethodHandle::invoke remains hidden
|
|
StackInspector.Caller.class.getName()
|
|
+"::handle",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewStackInspector"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertNotEquals(obj.filtered, 0);
|
|
}
|
|
|
|
/**
|
|
* This test invokes Constructor.newInstance() from
|
|
* the caller StackInspector.Caller.create method.
|
|
* It checks that the caller is StackInspector.Caller.
|
|
* It also checks the expected frames collected
|
|
* by walking the stack from the default StackInspector()
|
|
* constructor.
|
|
* This is done twice, once using a default StackWalker
|
|
* that hides reflection frames, once using a StackWalker
|
|
* configured to show reflection frames.
|
|
*/
|
|
@Test
|
|
public static void testConstructor() throws Exception {
|
|
// Sets the default walker which hides reflection
|
|
// frames.
|
|
StackInspector.walker.set(StackInspector.walkerHide);
|
|
|
|
// Calls the StackInspector.create method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The create method invokes Constructor.newInstance().
|
|
// No reflection frame should appear.
|
|
System.out.println("testConstructor: create");
|
|
|
|
StackInspector obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("create", How.class)
|
|
.invoke(null, How.CONSTRUCTOR));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
ReflectionFrames.class.getName()
|
|
+"::testConstructor"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.reflect method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The reflect method invokes the create method through
|
|
// reflection.
|
|
// The create method invokes Constructor.newInstance().
|
|
// No reflection frame should appear.
|
|
System.out.println("testConstructor: reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("reflect", How.class)
|
|
.invoke(null, How.CONSTRUCTOR));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
StackInspector.Caller.class.getName()
|
|
+"::reflect",
|
|
ReflectionFrames.class.getName()
|
|
+"::testConstructor"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.handle method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The handle method invokes the create method using
|
|
// MethodHandle.
|
|
// The create method invokes Constructor.newInstance().
|
|
// No reflection frame should appear.
|
|
System.out.println("testConstructor: handle");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("handle", How.class)
|
|
.invoke(null, How.CONSTRUCTOR));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
StackInspector.Caller.class.getName()
|
|
+"::handle",
|
|
ReflectionFrames.class.getName()
|
|
+"::testConstructor"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Sets a non-default walker configured to show
|
|
// reflection frames
|
|
StackInspector.walker.set(StackInspector.walkerShow);
|
|
|
|
// Calls the StackInspector.create method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The create method invokes Constructor.newInstance().
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testConstructor: create: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("create", How.class)
|
|
.invoke(null, How.CONSTRUCTOR));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
Constructor.class.getName()
|
|
+"::newInstanceWithCaller",
|
|
Constructor.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testConstructor"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertNotEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.reflect method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The reflect method invokes the create method through
|
|
// reflection.
|
|
// The create method invokes Constructor.newInstance().
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testConstructor: reflect: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("reflect", How.class)
|
|
.invoke(null, How.CONSTRUCTOR));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
Constructor.class.getName()
|
|
+"::newInstanceWithCaller",
|
|
Constructor.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
StackInspector.Caller.class.getName()
|
|
+"::reflect",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testConstructor"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertNotEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.handle method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The handle method invokes the create method using
|
|
// MethodHandle.
|
|
// The create method invokes Constructor.newInstance().
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testConstructor: handle: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("handle", How.class)
|
|
.invoke(null, How.CONSTRUCTOR));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
Constructor.class.getName()
|
|
+"::newInstanceWithCaller",
|
|
Constructor.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
// MethodHandle::invoke remains hidden
|
|
StackInspector.Caller.class.getName()
|
|
+"::handle",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testConstructor"));
|
|
assertEquals(obj.cls, StackInspector.Caller.class);
|
|
assertNotEquals(obj.filtered, 0);
|
|
}
|
|
|
|
/**
|
|
* This test invokes StackInspector.class.newInstance() from
|
|
* the caller StackInspector.Caller.create method. Because
|
|
* Class.newInstance() is not considered as a
|
|
* reflection frame, the caller returned by
|
|
* getCallerClass() should appear to be java.lang.Class
|
|
* and not StackInspector.Caller.
|
|
* It also checks the expected frames collected
|
|
* by walking the stack from the default StackInspector()
|
|
* constructor.
|
|
* This is done twice, once using a default StackWalker
|
|
* that hides reflection frames, once using a StackWalker
|
|
* configured to show reflection frames.
|
|
*/
|
|
@Test
|
|
public static void testNewInstance() throws Exception {
|
|
// Sets the default walker which hides reflection
|
|
// frames.
|
|
StackInspector.walker.set(StackInspector.walkerHide);
|
|
|
|
// Calls the StackInspector.create method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The create method invokes StackInspector.class.newInstance().
|
|
// No reflection frame should appear, except
|
|
// Class::newInstance which is not considered as
|
|
// a reflection frame.
|
|
System.out.println("testNewInstance: create");
|
|
|
|
StackInspector obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("create", How.class)
|
|
.invoke(null, How.CLASS));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
REFLECT_ACCESS.getName()
|
|
+"::newInstance",
|
|
REFLECTION_FACTORY.getName()
|
|
+"::newInstance",
|
|
Class.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewInstance"));
|
|
// Because implementation frames are not filtered, then the
|
|
// caller is ReflectAccess.class
|
|
assertEquals(obj.cls, REFLECT_ACCESS);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.reflect method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The reflect method invokes the create method through
|
|
// reflection.
|
|
// The create method invokes StackInspector.class.newInstance().
|
|
// No reflection frame should appear, except
|
|
// Class::newInstance which is not considered as
|
|
// a reflection frame.
|
|
System.out.println("testNewInstance: reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("reflect", How.class)
|
|
.invoke(null, How.CLASS));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
REFLECT_ACCESS.getName()
|
|
+"::newInstance",
|
|
REFLECTION_FACTORY.getName()
|
|
+"::newInstance",
|
|
Class.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
StackInspector.Caller.class.getName()
|
|
+"::reflect",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewInstance"));
|
|
|
|
// Because implementation frames are not filtered, then the
|
|
// caller is ReflectAccess.class
|
|
assertEquals(obj.cls, REFLECT_ACCESS);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.handle method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The handle method invokes the create method using
|
|
// reflection.
|
|
// The create method invokes StackInspector.class.newInstance().
|
|
// No reflection frame should appear, except
|
|
// Class::newInstance which is not considered as
|
|
// a reflection frame.
|
|
System.out.println("testNewInstance: handle");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("handle", How.class)
|
|
.invoke(null, How.CLASS));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
REFLECT_ACCESS.getName()
|
|
+"::newInstance",
|
|
REFLECTION_FACTORY.getName()
|
|
+"::newInstance",
|
|
Class.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
StackInspector.Caller.class.getName()
|
|
+"::handle",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewInstance"));
|
|
|
|
// Because implementation frames are not filtered, then the
|
|
// caller is ReflectAccess.class
|
|
assertEquals(obj.cls, REFLECT_ACCESS);
|
|
assertEquals(obj.filtered, 0);
|
|
|
|
// Sets a non-default walker configured to show
|
|
// reflection frames
|
|
StackInspector.walker.set(StackInspector.walkerShow);
|
|
|
|
// Calls the StackInspector.create method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The create method invokes StackInspector.class.newInstance().
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testNewInstance: create: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("create", How.class)
|
|
.invoke(null, How.CLASS));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
Constructor.class.getName()
|
|
+"::newInstanceWithCaller",
|
|
REFLECT_ACCESS.getName()
|
|
+"::newInstance",
|
|
Class.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewInstance"));
|
|
// Because implementation frames are not filtered, then the
|
|
// caller is ReflectAccess.class
|
|
assertEquals(obj.cls, REFLECT_ACCESS);
|
|
assertNotEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.reflect method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The reflect method invokes the create method through
|
|
// reflection.
|
|
// The create method invokes StackInspector.class.newInstance().
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testNewInstance: reflect: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("reflect", How.class)
|
|
.invoke(null, How.CLASS));
|
|
System.out.println(obj.collectedFrames);
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
Constructor.class.getName()
|
|
+"::newInstanceWithCaller",
|
|
REFLECT_ACCESS.getName()
|
|
+"::newInstance",
|
|
Class.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
StackInspector.Caller.class.getName()
|
|
+"::reflect",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewInstance"));
|
|
|
|
// Because implementation frames are not filtered, then the
|
|
// caller is ReflectAccess.class
|
|
assertEquals(obj.cls, REFLECT_ACCESS);
|
|
assertNotEquals(obj.filtered, 0);
|
|
|
|
// Calls the StackInspector.handle method through reflection
|
|
// and check the frames collected in the StackInspector
|
|
// default constructor.
|
|
// The handle method invokes the create method using
|
|
// MethodHandle.
|
|
// The create method invokes StackInspector.class.newInstance().
|
|
// We should see all reflection frames, except the
|
|
// jdk.internal.reflect frames which we are filtering
|
|
// out in StackInspector::filter.
|
|
System.out.println("testNewInstance: handle: show reflect");
|
|
|
|
obj = ((StackInspector)StackInspector.Caller.class
|
|
.getMethod("handle", How.class)
|
|
.invoke(null, How.CLASS));
|
|
assertEquals(obj.collectedFrames,
|
|
List.of(StackInspector.class.getName()
|
|
+"::<init>",
|
|
Constructor.class.getName()
|
|
+"::newInstanceWithCaller",
|
|
REFLECT_ACCESS.getName()
|
|
+"::newInstance",
|
|
Class.class.getName()
|
|
+"::newInstance",
|
|
StackInspector.Caller.class.getName()
|
|
+"::create",
|
|
// MethodHandle::invoke remains hidden
|
|
StackInspector.Caller.class.getName()
|
|
+"::handle",
|
|
Method.class.getName()
|
|
+"::invoke",
|
|
ReflectionFrames.class.getName()
|
|
+"::testNewInstance"));
|
|
|
|
// Because implementation frames are not filtered, then the
|
|
// caller is ReflectAccess.class
|
|
assertEquals(obj.cls, REFLECT_ACCESS);
|
|
assertNotEquals(obj.filtered, 0);
|
|
}
|
|
|
|
@Test
|
|
public static void testGetCaller() throws Exception {
|
|
// Sets the default walker which hides reflection
|
|
// frames.
|
|
StackInspector.walker.set(StackInspector.walkerHide);
|
|
|
|
assertEquals(StackInspector.getCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("getCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
|
|
// Sets a non-default walker configured to show
|
|
// reflection frames
|
|
StackInspector.walker.set(StackInspector.walkerShow);
|
|
|
|
assertEquals(StackInspector.getCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("getCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
}
|
|
|
|
@Test
|
|
public static void testReflectCaller() throws Exception {
|
|
// Sets the default walker which hides reflection
|
|
// frames.
|
|
StackInspector.walker.set(StackInspector.walkerHide);
|
|
|
|
assertEquals(StackInspector.reflectCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("reflectCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
|
|
// Sets a non-default walker configured to show
|
|
// reflection frames
|
|
StackInspector.walker.set(StackInspector.walkerShow);
|
|
|
|
assertEquals(StackInspector.reflectCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("reflectCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
}
|
|
|
|
@Test
|
|
public static void testSupplyCaller() throws Exception {
|
|
// Sets the default walker which hides reflection
|
|
// frames.
|
|
StackInspector.walker.set(StackInspector.walkerHide);
|
|
|
|
assertEquals(StackInspector.supplyCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("supplyCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
|
|
// Sets a non-default walker configured to show
|
|
// reflection frames
|
|
StackInspector.walker.set(StackInspector.walkerShow);
|
|
|
|
assertEquals(StackInspector.supplyCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("supplyCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
}
|
|
|
|
@Test
|
|
public static void testHandleCaller() throws Exception {
|
|
// Sets the default walker which hides reflection
|
|
// frames.
|
|
StackInspector.walker.set(StackInspector.walkerHide);
|
|
|
|
assertEquals(StackInspector.handleCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("handleCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
|
|
// Sets a non-default walker configured to show
|
|
// reflection frames
|
|
StackInspector.walker.set(StackInspector.walkerShow);
|
|
|
|
assertEquals(StackInspector.handleCaller(), ReflectionFrames.class);
|
|
assertEquals(StackInspector.class.getMethod("handleCaller").invoke(null),
|
|
ReflectionFrames.class);
|
|
}
|
|
|
|
static enum How { NEW, CONSTRUCTOR, CLASS};
|
|
|
|
/**
|
|
* An object that collect stack frames by walking the stack
|
|
* (and calling getCallerClass()) from within its constructor.
|
|
* For the purpose of this test, StackInspector objects are
|
|
* always created from the nested StackInspector.Caller class,
|
|
* which should therefore appear as the caller of the
|
|
* StackInspector constructor.
|
|
*/
|
|
static class StackInspector {
|
|
static final StackWalker walkerHide =
|
|
StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
|
|
static final StackWalker walkerShow =
|
|
StackWalker.getInstance(EnumSet.of(
|
|
StackWalker.Option.RETAIN_CLASS_REFERENCE,
|
|
StackWalker.Option.SHOW_REFLECT_FRAMES));
|
|
final static ThreadLocal<StackWalker> walker = new ThreadLocal<>() {
|
|
protected StackWalker initialValue() {
|
|
return walkerHide;
|
|
}
|
|
};
|
|
|
|
List<String> collectedFrames;
|
|
Class<?> cls = null;
|
|
boolean stop;
|
|
int filtered;
|
|
final boolean filterImplFrames;
|
|
|
|
public StackInspector() {
|
|
stop = false;
|
|
// if reflection frames are not hidden, we want to
|
|
// filter implementation frames before collecting
|
|
// to avoid depending on internal details.
|
|
filterImplFrames = walker.get() == walkerShow;
|
|
collectedFrames = walker.get().walk(this::parse);
|
|
cls = walker.get().getCallerClass();
|
|
}
|
|
|
|
public List<String> collectedFrames() {
|
|
return collectedFrames;
|
|
}
|
|
|
|
// The takeWhile method arrange for stopping frame collection
|
|
// as soon as a frame from ReflectionFrames.class is reached.
|
|
// The first such frame encountered is still included in the
|
|
// collected frames, but collection stops right after.
|
|
// This makes it possible to filter out anything above the
|
|
// the test method frame, such as frames from the test
|
|
// framework.
|
|
public boolean takeWhile(StackFrame f) {
|
|
if (stop) return false;
|
|
if (verbose) System.out.println(" " + f);
|
|
stop = stop || f.getDeclaringClass() == ReflectionFrames.class;
|
|
return true;
|
|
}
|
|
|
|
// filter out implementation frames to avoid depending
|
|
// on implementation details. If present, Class::newInstance,
|
|
// Method::invoke and Constructor::newInstance will
|
|
// still appear in the collected frames, which is
|
|
// sufficient for the purpose of the test.
|
|
// In the case where the StackWalker itself is supposed to
|
|
// filter the reflection frames, then this filter will always
|
|
// return true. This way, if such a reflection frame appears when
|
|
// it sjould have been filtered by StackWalker, it will make the
|
|
// test fail.
|
|
public boolean filter(StackFrame f) {
|
|
if (filterImplFrames &&
|
|
f.getClassName().startsWith("jdk.internal.reflect.")) {
|
|
filtered++;
|
|
return false;
|
|
}
|
|
if (!verbose) System.out.println(" " + f);
|
|
return true;
|
|
}
|
|
|
|
public String frame(StackFrame f) {
|
|
return f.getClassName() + "::" + f.getMethodName();
|
|
}
|
|
|
|
List<String> parse(Stream<StackFrame> s) {
|
|
return s.takeWhile(this::takeWhile)
|
|
.filter(this::filter)
|
|
.map(this::frame)
|
|
.collect(Collectors.toList());
|
|
}
|
|
|
|
/**
|
|
* The Caller class is used to create instances of
|
|
* StackInspector, either direcltly, or throug reflection.
|
|
*/
|
|
public static class Caller {
|
|
public static StackInspector create(How how) throws Exception {
|
|
switch(how) {
|
|
case NEW: return new StackInspector();
|
|
case CONSTRUCTOR: return StackInspector.class
|
|
.getConstructor().newInstance();
|
|
case CLASS: return StackInspector.class.newInstance();
|
|
default: throw new AssertionError(String.valueOf(how));
|
|
}
|
|
}
|
|
public static StackInspector reflect(How how) throws Exception {
|
|
return (StackInspector) Caller.class.getMethod("create", How.class)
|
|
.invoke(null, how);
|
|
}
|
|
public static StackInspector handle(How how) throws Exception {
|
|
Lookup lookup = MethodHandles.lookup();
|
|
MethodHandle mh = lookup.findStatic(Caller.class, "create",
|
|
MethodType.methodType(StackInspector.class, How.class));
|
|
try {
|
|
return (StackInspector) mh.invoke(how);
|
|
} catch (Error | Exception x) {
|
|
throw x;
|
|
} catch(Throwable t) {
|
|
throw new AssertionError(t);
|
|
}
|
|
}
|
|
}
|
|
|
|
public static Class<?> getCaller() throws Exception {
|
|
return walker.get().getCallerClass();
|
|
}
|
|
|
|
public static Class<?> reflectCaller() throws Exception {
|
|
return (Class<?>)StackWalker.class.getMethod("getCallerClass")
|
|
.invoke(walker.get());
|
|
}
|
|
|
|
public static Class<?> supplyCaller() throws Exception {
|
|
return ((Supplier<Class<?>>)StackInspector.walker.get()::getCallerClass).get();
|
|
}
|
|
|
|
public static Class<?> handleCaller() throws Exception {
|
|
Lookup lookup = MethodHandles.lookup();
|
|
MethodHandle mh = lookup.findVirtual(StackWalker.class, "getCallerClass",
|
|
MethodType.methodType(Class.class));
|
|
try {
|
|
return (Class<?>) mh.invoke(walker.get());
|
|
} catch (Error | Exception x) {
|
|
throw x;
|
|
} catch(Throwable t) {
|
|
throw new AssertionError(t);
|
|
}
|
|
}
|
|
}
|
|
}
|