1 /*
2 * Copyright (c) 2014, 2021, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.jimage;
27
28 /**
29 * @implNote This interface needs to maintain JDK 8 source compatibility.
30 *
31 * It is used internally in the JDK to implement jimage/jrtfs access,
32 * but also compiled and delivered as part of the jrtfs.jar to support access
33 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
34 */
35 public interface ImageStrings {
36 String get(int offset);
37
38 int add(final String string);
39
40 /**
41 * If there's a string at {@code offset} matching in full a substring of
42 * {@code string} starting at {@code stringOffset}, return the length
43 * of that string. Otherwise returns -1. Optional operation.
44 */
45 default int match(int offset, String string, int stringOffset) {
46 throw new UnsupportedOperationException();
47 }
48
49 }
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1 /*
2 * Copyright (c) 2014, 2025, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.jimage;
27
28 /**
29 * @implNote This interface needs to maintain JDK 8 source compatibility.
30 *
31 * It is used internally in the JDK to implement jimage/jrtfs access,
32 * but also compiled and delivered as part of the jrtfs.jar to support access
33 * to the jimage file provided by the shipped JDK by tools running on JDK 8.
34 */
35 public interface ImageStrings {
36 // String offset constants are useful for efficient classification
37 // of location entries without string comparison.
38 // They are validated during initialization of ImageStringsWriter.
39 //
40 // Adding new strings (with larger offsets) is possible without changing
41 // the jimage version number, but any change to existing strings must be
42 // accompanied by a jimage version number change.
43
44 /** Fixed offset for the empty string in the strings table. */
45 int EMPTY_STRING_OFFSET = 0;
46 /** Fixed offset for the string "class" in the strings table. */
47 int CLASS_STRING_OFFSET = 1;
48 /** Fixed offset for the string "modules" in the strings table. */
49 int MODULES_STRING_OFFSET = 7;
50 /** Fixed offset for the string "packages" in the strings table. */
51 int PACKAGES_STRING_OFFSET = 15;
52
53 String get(int offset);
54
55 int add(final String string);
56
57 /**
58 * If there's a string at {@code offset} matching in full a substring of
59 * {@code string} starting at {@code stringOffset}, return the length
60 * of that string. Otherwise returns -1. Optional operation.
61 */
62 default int match(int offset, String string, int stringOffset) {
63 throw new UnsupportedOperationException();
64 }
65
66 }
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