1 /*
2 * Copyright (c) 2014, 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 package com.sun.tools.jextract;
25
26 import java.foreign.layout.Function;
27 import java.foreign.layout.Layout;
28 import java.nio.file.Files;
29 import java.nio.file.Path;
30 import java.util.ArrayList;
31 import java.util.Arrays;
32 import java.util.List;
33 import java.util.Optional;
34 import java.util.stream.Collectors;
35 import java.util.stream.Stream;
36 import javax.lang.model.SourceVersion;
37
38 import jdk.internal.clang.Cursor;
39 import jdk.internal.clang.CursorKind;
40 import jdk.internal.clang.SourceLocation;
41 import jdk.internal.clang.Type;
42 import com.sun.tools.jextract.tree.LayoutUtils;
43 import jdk.internal.clang.TypeKind;
44
45 /**
46 * General utility functions
47 */
48 public class Utils {
49 public static void validSimpleIdentifier(String name) {
50 int length = name.length();
51 if (length == 0) {
52 throw new IllegalArgumentException();
53 }
54
55 int ch = name.codePointAt(0);
56 if (length == 1 && ch == '_') {
57 throw new IllegalArgumentException("'_' is no longer valid identifier.");
58 }
59
60 if (!Character.isJavaIdentifierStart(ch)) {
61 throw new IllegalArgumentException("Invalid start character for an identifier: " + ch);
62 }
63
64 for (int i = 1; i < length; i++) {
65 ch = name.codePointAt(i);
66 if (!Character.isJavaIdentifierPart(ch)) {
67 throw new IllegalArgumentException("Invalid character for an identifier: " + ch);
68 }
69 }
70 }
71
72 public static void validPackageName(String name) {
73 if (name.isEmpty()) {
74 throw new IllegalArgumentException();
75 }
76 int idx = name.lastIndexOf('.');
77 if (idx == -1) {
78 validSimpleIdentifier(name);
79 } else {
80 validSimpleIdentifier(name.substring(idx + 1));
81 validPackageName(name.substring(0, idx));
82 }
83 }
84
85 public static String toJavaIdentifier(String str) {
86 final int size = str.length();
87 StringBuilder sb = new StringBuilder(size);
88 if (! Character.isJavaIdentifierStart(str.charAt(0))) {
89 sb.append('_');
90 }
91 for (int i = 0; i < size; i++) {
92 char ch = str.charAt(i);
93 if (Character.isJavaIdentifierPart(ch)) {
94 sb.append(ch);
95 } else {
96 sb.append('_');
97 }
98 }
99 return sb.toString();
100 }
101
102 public static String toClassName(String cname) {
103 StringBuilder sb = new StringBuilder(cname.length());
104 cname = toJavaIdentifier(cname);
105 sb.append(cname);
106 if (SourceVersion.isKeyword(cname)) {
107 sb.append("$");
108 }
109 return sb.toString();
110 }
111
112 public static String toInternalName(String pkg, String name, String... nested) {
113 if ((pkg == null || pkg.isEmpty()) && nested == null) {
114 return name;
115 }
116
117 StringBuilder sb = new StringBuilder();
118 if (pkg != null && ! pkg.isEmpty()) {
119 sb.append(pkg.replace('.', '/'));
120 if (sb.charAt(sb.length() - 1) != '/') {
121 sb.append('/');
122 }
123 }
124 sb.append(name);
125 for (String n: nested) {
126 sb.append('$');
127 sb.append(n);
128 }
129 return sb.toString();
130 }
131
132 public static String getName(Type type) {
133 return LayoutUtils.getName(type);
134 }
135
136 public static Function getFunction(Type type) {
137 return LayoutUtils.getFunction(type);
138 }
139
140 public static Class<?> unboxIfNeeded(Class<?> clazz) {
141 if (clazz == Boolean.class) {
142 return boolean.class;
143 } else if (clazz == Void.class) {
144 return void.class;
145 } else if (clazz == Byte.class) {
146 return byte.class;
147 } else if (clazz == Character.class) {
148 return char.class;
149 } else if (clazz == Short.class) {
150 return short.class;
151 } else if (clazz == Integer.class) {
152 return int.class;
153 } else if (clazz == Long.class) {
154 return long.class;
155 } else if (clazz == Float.class) {
156 return float.class;
157 } else if (clazz == Double.class) {
158 return double.class;
159 } else {
160 return clazz;
161 }
162 }
163
164 public static Stream<Cursor> flattenableChildren(Cursor c) {
165 return c.children()
166 .filter(cx -> cx.isAnonymousStruct() || cx.kind() == CursorKind.FieldDecl);
167 }
168
169 public static Optional<Cursor> lastChild(Cursor c) {
170 List<Cursor> children = flattenableChildren(c)
171 .collect(Collectors.toList());
172 return children.isEmpty() ? Optional.empty() : Optional.of(children.get(children.size() - 1));
173 }
174
175 public static boolean hasIncompleteArray(Cursor c) {
176 switch (c.kind()) {
177 case FieldDecl:
178 return c.type().kind() == TypeKind.IncompleteArray;
179 case UnionDecl:
180 return flattenableChildren(c)
181 .anyMatch(Utils::hasIncompleteArray);
182 case StructDecl:
183 return lastChild(c).map(Utils::hasIncompleteArray).orElse(false);
184 default:
185 throw new IllegalStateException("Unhandled cursor kind: " + c.kind());
186 }
187 }
188
189 // return builtin Record types accessible from the given Type
190 public static Stream<Cursor> getBuiltinRecordTypes(Type type) {
191 List<Cursor> recordTypes = new ArrayList<>();
192 fillBuiltinRecordTypes(type, recordTypes);
193 return recordTypes.stream().distinct();
194 }
195
196 private static void fillBuiltinRecordTypes(Type type, List<Cursor> recordTypes) {
197 switch (type.kind()) {
198 case ConstantArray:
199 case IncompleteArray:
200 fillBuiltinRecordTypes(type.getElementType(), recordTypes);
201 break;
202
203 case FunctionProto:
204 case FunctionNoProto: {
205 final int numArgs = type.numberOfArgs();
206 for (int i = 0; i < numArgs; i++) {
207 fillBuiltinRecordTypes(type.argType(i), recordTypes);
208 }
209 fillBuiltinRecordTypes(type.resultType(), recordTypes);
210 }
211 break;
212
213 case Record: {
214 Cursor c = type.getDeclarationCursor();
215 if (c.isDefinition()) {
216 SourceLocation sloc = c.getSourceLocation();
217 if (sloc != null && sloc.getFileLocation().path() == null) {
218 recordTypes.add(c);
219 }
220 }
221 }
222 break;
223
224 case BlockPointer:
225 case Pointer:
226 fillBuiltinRecordTypes(type.getPointeeType().canonicalType(), recordTypes);
227 break;
228
229 case Unexposed:
230 case Elaborated:
231 case Typedef:
232 fillBuiltinRecordTypes(type.canonicalType(), recordTypes);
233 break;
234
235 default: // nothing to do
236 }
237 }
238
239 // return the absolute path of the library of given name by searching
240 // in the given array of paths.
241 public static Optional<Path> findLibraryPath(Path[] paths, String libName) {
242 return Arrays.stream(paths).
243 map(p -> p.resolve(System.mapLibraryName(libName))).
244 filter(Files::isRegularFile).map(Path::toAbsolutePath).findFirst();
245 }
246 }