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/*
* Copyright (c) 2014, 2015, 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 8058828
* @modules java.base/jdk.internal.org.objectweb.asm
* java.base/jdk.internal.misc
*
* @run main/bootclasspath/othervm -Xbatch compiler.jsr292.VMAnonymousClasses
*/
package compiler.jsr292;
import jdk.internal.misc.Unsafe;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import jdk.internal.org.objectweb.asm.Opcodes;
import java.lang.invoke.ConstantCallSite;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.MutableCallSite;
import java.lang.invoke.VolatileCallSite;
public class VMAnonymousClasses {
static final String TEST_METHOD_NAME = "constant";
static final Unsafe UNSAFE = Unsafe.getUnsafe();
static int getConstantPoolSize(byte[] classFile) {
// The first few bytes:
// u4 magic;
// u2 minor_version;
// u2 major_version;
// u2 constant_pool_count;
return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);
}
static void test(Object value) throws ReflectiveOperationException {
System.out.printf("Test: %s", value != null ? value.getClass() : "null");
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, "Test", null, "java/lang/Object", null);
MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, TEST_METHOD_NAME, "()Ljava/lang/Object;", null, null);
String placeholder = "CONSTANT";
int index = cw.newConst(placeholder);
mv.visitLdcInsn(placeholder);
mv.visitInsn(Opcodes.ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
byte[] classFile = cw.toByteArray();
Object[] cpPatches = new Object[getConstantPoolSize(classFile)];
cpPatches[index] = value;
Class<?> test = UNSAFE.defineAnonymousClass(VMAnonymousClasses.class, classFile, cpPatches);
Object expectedResult = (value != null) ? value : placeholder;
for (int i = 0; i<15000; i++) {
Object result = test.getMethod(TEST_METHOD_NAME).invoke(null);
if (result != expectedResult) {
throw new AssertionError(String.format("Wrong value returned: %s != %s", value, result));
}
}
System.out.println(" PASSED");
}
public static void main(String[] args) throws ReflectiveOperationException {
// Objects
test(new Object());
test("TEST");
test(new VMAnonymousClasses());
test(null);
// Class
test(String.class);
// Arrays
test(new boolean[0]);
test(new byte[0]);
test(new char[0]);
test(new short[0]);
test(new int[0]);
test(new long[0]);
test(new float[0]);
test(new double[0]);
test(new Object[0]);
// Multi-dimensional arrays
test(new byte[0][0]);
test(new Object[0][0]);
// MethodHandle-related
MethodType mt = MethodType.methodType(void.class, String[].class);
MethodHandle mh = MethodHandles.lookup().findStatic(VMAnonymousClasses.class, "main", mt);
test(mt);
test(mh);
test(new ConstantCallSite(mh));
test(new MutableCallSite(MethodType.methodType(void.class)));
test(new VolatileCallSite(MethodType.methodType(void.class)));
System.out.println("TEST PASSED");
}
}
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