1 /* 2 * Copyright (c) 2018, Google LLC. All rights reserved. 3 * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 /** 26 * @test 27 * @bug 8211138 8362885 28 * @summary Missing Flag enum constants 29 * @library /tools/javac/lib 30 * @modules jdk.compiler/com.sun.tools.javac.code 31 * @compile FlagsTest.java 32 * @run main/manual FlagsTest 33 */ 34 import com.sun.tools.javac.code.Flags; 35 import com.sun.tools.javac.code.Flags.FlagTarget; 36 import com.sun.tools.javac.code.Flags.NotFlag; 37 import com.sun.tools.javac.code.Flags.Use; 38 import java.lang.reflect.Field; 39 import java.util.ArrayList; 40 import java.util.HashMap; 41 import java.util.List; 42 import java.util.Map; 43 44 public class FlagsTest { 45 46 private static final int U2_SIZE = 16; 47 48 public static void main(String[] args) throws Throwable { 49 findFreeFlags(); 50 } 51 52 private static void findFreeFlags() throws Throwable { 53 Map<FlagTarget, Map<Long, List<Field>>> target2Flag2Fields = computeTarget2Flag2Fields(); 54 55 for (FlagTarget target : FlagTarget.values()) { 56 long freeFlags = ~collectFlags(target2Flag2Fields, target); 57 58 printFreeFlags(target.name(), freeFlags); 59 } 60 } 61 62 private static Map<FlagTarget, Map<Long, List<Field>>> computeTarget2Flag2Fields() throws Throwable { 63 Map<FlagTarget, Map<Long, List<Field>>> target2Flag2Fields = new HashMap<>(); 64 for (Field f : Flags.class.getFields()) { 65 if (f.isAnnotationPresent(NotFlag.class)) { 66 continue; 67 } 68 69 Use use = f.getAnnotation(Use.class); 70 71 if (use == null) { 72 throw new AssertionError("No @Use and no @NotFlag for: " + f.getName()); 73 } 74 75 long flagValue = ((Number) f.get(null)).longValue(); 76 77 for (FlagTarget target : use.value()) { 78 target2Flag2Fields.computeIfAbsent(target, _ -> new HashMap<>()) 79 .computeIfAbsent(flagValue, _ -> new ArrayList<>()) 80 .add(f); 81 } 82 } 83 return target2Flag2Fields; 84 } 85 86 private static void printFreeFlags(String comment, long freeFlags) { 87 System.err.print("free flags for " + comment + ": "); 88 for (int bit = U2_SIZE; bit < Long.SIZE; bit++) { //lowest 16 bits are used in classfiles, never suggest adding anything there 89 if ((freeFlags & (1L << bit)) != 0) { 90 System.err.print("1L<<" + bit + " "); 91 } 92 } 93 System.err.println(); 94 } 95 96 private static long collectFlags(Map<FlagTarget, Map<Long, List<Field>>> target2Flag2Fields, FlagTarget... forTargets) { 97 long flags = 0; 98 99 for (FlagTarget target : forTargets) { 100 for (long used : target2Flag2Fields.get(target).keySet()) { 101 flags |= used; 102 } 103 } 104 105 return flags; 106 } 107 }