1 /* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8140450 8152893 27 * @summary Basic test for StackWalker.getCallerClass() 28 * @run main/othervm GetCallerClassTest 29 * @run main/othervm GetCallerClassTest sm 30 */ 31 32 import static java.lang.StackWalker.Option.*; 33 import java.lang.invoke.MethodHandle; 34 import java.lang.invoke.MethodHandles; 35 import java.lang.invoke.MethodType; 36 import java.lang.reflect.InvocationTargetException; 37 import java.lang.reflect.Method; 38 import java.security.Permission; 39 import java.security.PermissionCollection; 40 import java.security.Permissions; 41 import java.security.Policy; 42 import java.security.ProtectionDomain; 43 import java.util.Arrays; 44 import java.util.EnumSet; 45 import java.util.List; 46 47 public class GetCallerClassTest { 48 private final StackWalker walker; 49 private final boolean expectUOE; 50 51 public GetCallerClassTest(StackWalker sw, boolean expect) { 52 this.walker = sw; 53 this.expectUOE = expect; 54 } 55 public static void main(String... args) throws Exception { 56 if (args.length > 0 && args[0].equals("sm")) { 57 PermissionCollection perms = new Permissions(); 58 perms.add(new StackFramePermission("retainClassReference")); 59 Policy.setPolicy(new Policy() { 60 @Override 61 public boolean implies(ProtectionDomain domain, Permission p) { 62 return perms.implies(p); 63 } 64 }); 65 System.setSecurityManager(new SecurityManager()); 66 } 67 new GetCallerClassTest(StackWalker.getInstance(), true).test(); 68 new GetCallerClassTest(StackWalker.getInstance(RETAIN_CLASS_REFERENCE), false).test(); 69 new GetCallerClassTest(StackWalker.getInstance(EnumSet.of(RETAIN_CLASS_REFERENCE, 70 SHOW_HIDDEN_FRAMES)), false).test(); 71 } 72 73 public void test() { 74 new TopLevelCaller().run(); 75 new LambdaTest().run(); 76 new Nested().createNestedCaller().run(); 77 new InnerClassCaller().run(); 78 new ReflectionTest().run(); 79 80 List<Thread> threads = Arrays.asList( 81 new Thread(new TopLevelCaller()), 82 new Thread(new LambdaTest()), 83 new Thread(new Nested().createNestedCaller()), 84 new Thread(new InnerClassCaller()), 85 new Thread(new ReflectionTest()) 86 ); 87 threads.stream().forEach(Thread::start); 88 threads.stream().forEach(t -> { 89 try { 90 t.join(); 91 } catch (InterruptedException e) { 92 throw new RuntimeException(e); 93 } 94 }); 95 } 96 97 public static void staticGetCallerClass(StackWalker stackWalker, 98 Class<?> expected, 99 boolean expectUOE) { 100 try { 101 Class<?> c = stackWalker.getCallerClass(); 102 assertEquals(c, expected); 103 if (expectUOE) { // Should have thrown 104 throw new RuntimeException("Didn't get expected exception"); 105 } 106 } catch (RuntimeException e) { // also catches UOE 107 if (expectUOE && causeIsUOE(e)) { 108 return; /* expected */ 109 } 110 System.err.println("Unexpected exception:"); 111 throw e; 112 } 113 } 114 115 public static void reflectiveGetCallerClass(StackWalker stackWalker, 116 Class<?> expected, 117 boolean expectUOE) { 118 try { 119 Method m = StackWalker.class.getMethod("getCallerClass"); 120 Class<?> c = (Class<?>) m.invoke(stackWalker); 121 assertEquals(c, expected); 122 if (expectUOE) { // Should have thrown 123 throw new RuntimeException("Didn't get expected exception"); 124 } 125 } catch (Throwable e) { 126 if (expectUOE && causeIsUOE(e)) { 127 return; /* expected */ 128 } 129 System.err.println("Unexpected exception:"); 130 throw new RuntimeException(e); 131 } 132 } 133 134 public static void methodHandleGetCallerClass(StackWalker stackWalker, 135 Class<?> expected, 136 boolean expectUOE) { 137 MethodHandles.Lookup lookup = MethodHandles.lookup(); 138 try { 139 MethodHandle mh = lookup.findVirtual(StackWalker.class, "getCallerClass", 140 MethodType.methodType(Class.class)); 141 Class<?> c = (Class<?>) mh.invokeExact(stackWalker); 142 assertEquals(c, expected); 143 if (expectUOE) { // Should have thrown 144 throw new RuntimeException("Didn't get expected exception"); 145 } 146 } catch (Throwable e) { 147 if (expectUOE && causeIsUOE(e)) { 148 return; /* expected */ 149 } 150 System.err.println("Unexpected exception:"); 151 throw new RuntimeException(e); 152 } 153 } 154 155 public static void assertEquals(Class<?> c, Class<?> expected) { 156 if (expected != c) { 157 throw new RuntimeException("Got " + c + ", but expected " + expected); 158 } 159 } 160 161 /** Is there an UnsupportedOperationException in there? */ 162 public static boolean causeIsUOE(Throwable t) { 163 while (t != null) { 164 if (t instanceof UnsupportedOperationException) { 165 return true; 166 } 167 t = t.getCause(); 168 } 169 return false; 170 } 171 172 class TopLevelCaller implements Runnable { 173 public void run() { 174 GetCallerClassTest.staticGetCallerClass(walker, this.getClass(), expectUOE); 175 GetCallerClassTest.reflectiveGetCallerClass(walker, this.getClass(), expectUOE); 176 GetCallerClassTest.methodHandleGetCallerClass(walker, this.getClass(), expectUOE); 177 } 178 } 179 180 class LambdaTest implements Runnable { 181 public void run() { 182 Runnable lambdaRunnable = () -> { 183 try { 184 Class<?> c = walker.getCallerClass(); 185 186 assertEquals(c, LambdaTest.class); 187 if (expectUOE) { // Should have thrown 188 throw new RuntimeException("Didn't get expected exception"); 189 } 190 } catch (Throwable e) { 191 if (expectUOE && causeIsUOE(e)) { 192 return; /* expected */ 193 } 194 System.err.println("Unexpected exception:"); 195 throw new RuntimeException(e); 196 } 197 }; 198 lambdaRunnable.run(); 199 } 200 } 201 202 class Nested { 203 NestedClassCaller createNestedCaller() { return new NestedClassCaller(); } 204 class NestedClassCaller implements Runnable { 205 public void run() { 206 GetCallerClassTest.staticGetCallerClass(walker, this.getClass(), expectUOE); 207 GetCallerClassTest.reflectiveGetCallerClass(walker, this.getClass(), expectUOE); 208 GetCallerClassTest.methodHandleGetCallerClass(walker, this.getClass(), expectUOE); 209 } 210 } 211 } 212 213 class InnerClassCaller implements Runnable { 214 public void run() { 215 new Inner().test(); 216 } 217 class Inner { 218 void test() { 219 GetCallerClassTest.staticGetCallerClass(walker, this.getClass(), expectUOE); 220 GetCallerClassTest.reflectiveGetCallerClass(walker, this.getClass(), expectUOE); 221 GetCallerClassTest.methodHandleGetCallerClass(walker, this.getClass(), expectUOE); 222 } 223 } 224 } 225 226 class ReflectionTest implements Runnable { 227 final MethodType methodType = 228 MethodType.methodType(void.class, StackWalker.class, Class.class, boolean.class); 229 230 public void run() { 231 callMethodHandle(); 232 callMethodHandleRefl(); 233 callMethodInvoke(); 234 callMethodInvokeRefl(); 235 } 236 void callMethodHandle() { 237 MethodHandles.Lookup lookup = MethodHandles.publicLookup(); 238 try { 239 MethodHandle mh = lookup.findStatic(GetCallerClassTest.class, 240 "staticGetCallerClass", 241 methodType); 242 mh.invokeExact(walker, ReflectionTest.class, expectUOE); 243 } catch (Throwable e) { 244 throw new RuntimeException(e); 245 } 246 } 247 void callMethodHandleRefl() { 248 MethodHandles.Lookup lookup = MethodHandles.publicLookup(); 249 try { 250 MethodHandle mh = lookup.findStatic(GetCallerClassTest.class, 251 "reflectiveGetCallerClass", 252 methodType); 253 mh.invokeExact(walker, ReflectionTest.class, expectUOE); 254 } catch (Throwable e) { 255 throw new RuntimeException(e); 256 } 257 } 258 void callMethodInvoke() { 259 try { 260 Method m = GetCallerClassTest.class.getMethod("staticGetCallerClass", 261 StackWalker.class, Class.class, boolean.class); 262 m.invoke(null, walker, ReflectionTest.class, expectUOE); 263 } catch (NoSuchMethodException|IllegalAccessException|InvocationTargetException e) { 264 throw new RuntimeException(e); 265 } 266 } 267 void callMethodInvokeRefl() { 268 try { 269 Method m = GetCallerClassTest.class.getMethod("reflectiveGetCallerClass", 270 StackWalker.class, Class.class, boolean.class); 271 m.invoke(null, walker, ReflectionTest.class, expectUOE); 272 } catch (UnsupportedOperationException e) { 273 throw e; 274 } catch (NoSuchMethodException|IllegalAccessException|InvocationTargetException e) { 275 throw new RuntimeException(e); 276 } 277 } 278 } 279 }