1 /* 2 * Copyright (c) 2022, 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 8280164 27 * @summary Check emission of Preload attribute 28 * @modules jdk.jdeps/com.sun.tools.classfile 29 * @enablePreview 30 * @run main PreloadAttributeTest 31 */ 32 33 import com.sun.tools.classfile.*; 34 import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info; 35 36 public class PreloadAttributeTest { 37 38 final value class V1 {} 39 final value class V2 {} 40 final value class V3 {} 41 final value class V4 {} 42 final value class V5 {} 43 final value class V6 {} 44 final value class V7 {} 45 final value class V8 {} 46 final value class V9 {} 47 48 static final value class X { 49 final V1 [] v1 = null; // field descriptor, encoding array type - no preload. 50 V2 foo() { // method descriptor encoding value type, to be preloaded 51 return null; 52 } 53 void foo(V3 v3) { // method descriptor encoding value type, to be preloaded 54 } 55 void foo(int x) { 56 V4 [] v4 = null; // local variable encoding array type - no preload. 57 } 58 void goo(V6[] v6) { // parameter uses value type but as array component - no preload. 59 V5 v5 = null; // preload value type used for local type. 60 if (v5 == null) { 61 // ... 62 } else { 63 V5 [] v52 = null; 64 } 65 } 66 final V7 v7 = null; // field descriptor uses value type - to be preloaded. 67 V8 [] goo(V9 [] v9) { // neither V8 nor V9 call for preload being array component types 68 return null; 69 } 70 } 71 // So we expect ONLY V2, V3 V5, V7 to be in Preload list 72 73 public static void main(String[] args) throws Exception { 74 ClassFile cls = ClassFile.read(PreloadAttributeTest.class.getResourceAsStream("PreloadAttributeTest$X.class")); 75 76 if (cls == null) { 77 throw new AssertionError("Could not locate the class files"); 78 } 79 80 /* Check emission of Preload attribute */ 81 Preload_attribute preloads = (Preload_attribute) cls.attributes.get(Attribute.Preload); 82 if (preloads == null) { 83 throw new AssertionError("Missing Preload attribute!"); 84 } 85 if (preloads.number_of_classes != 4) { 86 throw new AssertionError("Incorrect number of Preload classes"); 87 } 88 89 int mask = 0x56; 90 for (int i = 0; i < preloads.number_of_classes; i++) { 91 CONSTANT_Class_info clsInfo = cls.constant_pool.getClassInfo( 92 preloads.value_class_info_index[i]); 93 switch (clsInfo.getName()) { 94 case "PreloadAttributeTest$V2": 95 mask &= ~2; break; 96 case "PreloadAttributeTest$V3": 97 mask &= ~4; break; 98 case "PreloadAttributeTest$V5": 99 mask &= ~16; break; 100 case "PreloadAttributeTest$V7" : 101 mask &= ~64; break; 102 default: 103 throw new AssertionError("Unexpected Preload class entry!"); 104 } 105 } 106 if (mask != 0) { 107 throw new AssertionError("Some Preload class entries are missing!"); 108 } 109 } 110 }