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 import com.sun.tools.classfile.*; 25 import com.sun.tools.classfile.BootstrapMethods_attribute.BootstrapMethodSpecifier; 26 import com.sun.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info; 27 import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info; 28 29 import java.io.File; 30 31 /* 32 * @test 33 * @bug 8148483 8151516 8151223 34 * @summary Test that StringConcat is working for JDK >= 9 35 * @modules jdk.jdeps/com.sun.tools.classfile 36 * 37 * @clean TestIndyStringConcat* 38 * @compile -source 7 -target 7 TestIndyStringConcat.java 39 * @run main TestIndyStringConcat false 40 * 41 * @clean TestIndyStringConcat* 42 * @compile -source 8 -target 8 TestIndyStringConcat.java 43 * @run main TestIndyStringConcat false 44 * 45 * @clean TestIndyStringConcat* 46 * @compile -XDstringConcat=inline -source 9 -target 9 TestIndyStringConcat.java 47 * @run main TestIndyStringConcat false 48 * 49 * @clean TestIndyStringConcat* 50 * @compile -XDstringConcat=indy -source 9 -target 9 TestIndyStringConcat.java 51 * @run main TestIndyStringConcat true 52 * 53 * @clean TestIndyStringConcat* 54 * @compile -XDstringConcat=indyWithConstants -source 9 -target 9 TestIndyStringConcat.java 55 * @run main TestIndyStringConcat true 56 */ 57 public class TestIndyStringConcat { 58 59 static String other; 60 61 public static String test() { 62 return "Foo" + other; 63 } 64 65 public static void main(String[] args) throws Exception { 66 boolean expected = Boolean.valueOf(args[0]); 67 boolean actual = hasStringConcatFactoryCall("test"); 68 if (expected != actual) { 69 throw new AssertionError("expected = " + expected + ", actual = " + actual); 70 } 71 } 72 73 public static boolean hasStringConcatFactoryCall(String methodName) throws Exception { 74 ClassFile classFile = ClassFile.read(new File(System.getProperty("test.classes", "."), 75 TestIndyStringConcat.class.getName() + ".class")); 76 ConstantPool constantPool = classFile.constant_pool; 77 78 BootstrapMethods_attribute bsm_attr = 79 (BootstrapMethods_attribute)classFile 80 .getAttribute(Attribute.BootstrapMethods); 81 82 for (Method method : classFile.methods) { 83 if (method.getName(constantPool).equals(methodName)) { 84 Code_attribute code = (Code_attribute) method.attributes 85 .get(Attribute.Code); 86 for (Instruction i : code.getInstructions()) { 87 if (i.getOpcode() == Opcode.INVOKEDYNAMIC) { 88 CONSTANT_InvokeDynamic_info indyInfo = 89 (CONSTANT_InvokeDynamic_info) constantPool.get(i.getUnsignedShort(1)); 90 91 BootstrapMethodSpecifier bsmSpec = 92 bsm_attr.bootstrap_method_specifiers[indyInfo.bootstrap_method_attr_index]; 93 94 CONSTANT_MethodHandle_info bsmInfo = 95 (CONSTANT_MethodHandle_info) constantPool.get(bsmSpec.bootstrap_method_ref); 96 97 if (bsmInfo.getCPRefInfo().getClassName().equals("java/lang/invoke/StringConcatFactory")) { 98 return true; 99 } 100 } 101 } 102 } 103 } 104 return false; 105 } 106 107 }