/* * Copyright (c) 2015, 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. */ import com.sun.tools.classfile.*; import com.sun.tools.classfile.BootstrapMethods_attribute.BootstrapMethodSpecifier; import com.sun.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info; import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info; import java.io.File; /* * @test * @bug 8148483 8151516 8151223 * @summary Test that StringConcat is working for JDK >= 9 * @modules jdk.jdeps/com.sun.tools.classfile * * @clean * * @compile -source 8 -target 8 TestIndyStringConcat.java * @run main TestIndyStringConcat false * * @clean * * @compile -XDstringConcat=inline TestIndyStringConcat.java * @run main TestIndyStringConcat false * * @clean * * @compile -XDstringConcat=indy TestIndyStringConcat.java * @run main TestIndyStringConcat true * * @clean * * @compile -XDstringConcat=indyWithConstants TestIndyStringConcat.java * @run main TestIndyStringConcat true */ public class TestIndyStringConcat { static String other; public static String test() { return "Foo" + other; } public static void main(String[] args) throws Exception { boolean expected = Boolean.valueOf(args[0]); boolean actual = hasStringConcatFactoryCall("test"); if (expected != actual) { throw new AssertionError("expected = " + expected + ", actual = " + actual); } } public static boolean hasStringConcatFactoryCall(String methodName) throws Exception { ClassFile classFile = ClassFile.read(new File(System.getProperty("test.classes", "."), TestIndyStringConcat.class.getName() + ".class")); ConstantPool constantPool = classFile.constant_pool; BootstrapMethods_attribute bsm_attr = (BootstrapMethods_attribute)classFile .getAttribute(Attribute.BootstrapMethods); for (Method method : classFile.methods) { if (method.getName(constantPool).equals(methodName)) { Code_attribute code = (Code_attribute) method.attributes .get(Attribute.Code); for (Instruction i : code.getInstructions()) { if (i.getOpcode() == Opcode.INVOKEDYNAMIC) { CONSTANT_InvokeDynamic_info indyInfo = (CONSTANT_InvokeDynamic_info) constantPool.get(i.getUnsignedShort(1)); BootstrapMethodSpecifier bsmSpec = bsm_attr.bootstrap_method_specifiers[indyInfo.bootstrap_method_attr_index]; CONSTANT_MethodHandle_info bsmInfo = (CONSTANT_MethodHandle_info) constantPool.get(bsmSpec.bootstrap_method_ref); if (bsmInfo.getCPRefInfo().getClassName().equals("java/lang/invoke/StringConcatFactory")) { return true; } } } } } return false; } // this version of the code can be used when ClassFile API in not in a preview // public static boolean hasStringConcatFactoryCall(String methodName) throws Exception { // ClassModel classFile = ClassFile.of().parse(new File(System.getProperty("test.classes", "."), // TestIndyStringConcat.class.getName() + ".class").toPath()); // // for (MethodModel method : classFile.methods()) { // if (method.methodName().equalsString(methodName)) { // CodeAttribute code = method.findAttribute(Attributes.CODE).orElseThrow(); // for (CodeElement i : code.elementList()) { // if (i instanceof InvokeDynamicInstruction) { // InvokeDynamicInstruction indy = (InvokeDynamicInstruction) i; // BootstrapMethodEntry bsmSpec = indy.invokedynamic().bootstrap(); // MethodHandleEntry bsmInfo = bsmSpec.bootstrapMethod(); // if (bsmInfo.reference().owner().asInternalName().equals("java/lang/invoke/StringConcatFactory")) { // return true; // } // } // } // } // } // return false; // } }