1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
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 * This file is available under and governed by the GNU General Public
27 * License version 2 only, as published by the Free Software Foundation.
28 * However, the following notice accompanied the original version of this
29 * file:
30 *
31 * ASM: a very small and fast Java bytecode manipulation framework
32 * Copyright (c) 2000-2011 INRIA, France Telecom
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the copyright holders nor the names of its
44 * contributors may be used to endorse or promote products derived from
45 * this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
57 * THE POSSIBILITY OF SUCH DAMAGE.
58 */
59 package jdk.internal.org.objectweb.asm;
60
61 import java.lang.reflect.Constructor;
62 import java.lang.reflect.InvocationTargetException;
63 import java.lang.reflect.Method;
64
65 /**
66 * A Java field or method type. This class can be used to make it easier to manipulate type and
67 * method descriptors.
68 *
69 * @author Eric Bruneton
70 * @author Chris Nokleberg
71 */
72 public final class Type {
73
74 /** The sort of the {@code void} type. See {@link #getSort}. */
75 public static final int VOID = 0;
76
77 /** The sort of the {@code boolean} type. See {@link #getSort}. */
78 public static final int BOOLEAN = 1;
79
80 /** The sort of the {@code char} type. See {@link #getSort}. */
81 public static final int CHAR = 2;
82
83 /** The sort of the {@code byte} type. See {@link #getSort}. */
84 public static final int BYTE = 3;
85
86 /** The sort of the {@code short} type. See {@link #getSort}. */
87 public static final int SHORT = 4;
88
89 /** The sort of the {@code int} type. See {@link #getSort}. */
90 public static final int INT = 5;
91
92 /** The sort of the {@code float} type. See {@link #getSort}. */
93 public static final int FLOAT = 6;
94
95 /** The sort of the {@code long} type. See {@link #getSort}. */
96 public static final int LONG = 7;
97
98 /** The sort of the {@code double} type. See {@link #getSort}. */
99 public static final int DOUBLE = 8;
100
101 /** The sort of array reference types. See {@link #getSort}. */
102 public static final int ARRAY = 9;
103
104 /** The sort of object reference types. See {@link #getSort}. */
105 public static final int OBJECT = 10;
106
107 /** The sort of method types. See {@link #getSort}. */
108 public static final int METHOD = 11;
109
110 /** The (private) sort of object reference types represented with an internal name. */
111 private static final int INTERNAL = 12;
112
113 /** The descriptors of the primitive types. */
114 private static final String PRIMITIVE_DESCRIPTORS = "VZCBSIFJD";
115
116 /** The {@code void} type. */
117 public static final Type VOID_TYPE = new Type(VOID, PRIMITIVE_DESCRIPTORS, VOID, VOID + 1);
118
119 /** The {@code boolean} type. */
120 public static final Type BOOLEAN_TYPE =
121 new Type(BOOLEAN, PRIMITIVE_DESCRIPTORS, BOOLEAN, BOOLEAN + 1);
122
123 /** The {@code char} type. */
124 public static final Type CHAR_TYPE = new Type(CHAR, PRIMITIVE_DESCRIPTORS, CHAR, CHAR + 1);
125
126 /** The {@code byte} type. */
127 public static final Type BYTE_TYPE = new Type(BYTE, PRIMITIVE_DESCRIPTORS, BYTE, BYTE + 1);
128
129 /** The {@code short} type. */
130 public static final Type SHORT_TYPE = new Type(SHORT, PRIMITIVE_DESCRIPTORS, SHORT, SHORT + 1);
131
132 /** The {@code int} type. */
133 public static final Type INT_TYPE = new Type(INT, PRIMITIVE_DESCRIPTORS, INT, INT + 1);
134
135 /** The {@code float} type. */
136 public static final Type FLOAT_TYPE = new Type(FLOAT, PRIMITIVE_DESCRIPTORS, FLOAT, FLOAT + 1);
137
138 /** The {@code long} type. */
139 public static final Type LONG_TYPE = new Type(LONG, PRIMITIVE_DESCRIPTORS, LONG, LONG + 1);
140
141 /** The {@code double} type. */
142 public static final Type DOUBLE_TYPE =
143 new Type(DOUBLE, PRIMITIVE_DESCRIPTORS, DOUBLE, DOUBLE + 1);
144
145 // -----------------------------------------------------------------------------------------------
146 // Fields
147 // -----------------------------------------------------------------------------------------------
148
149 /**
150 * The sort of this type. Either {@link #VOID}, {@link #BOOLEAN}, {@link #CHAR}, {@link #BYTE},
151 * {@link #SHORT}, {@link #INT}, {@link #FLOAT}, {@link #LONG}, {@link #DOUBLE}, {@link #ARRAY},
152 * {@link #OBJECT}, {@link #METHOD} or {@link #INTERNAL}.
153 */
154 private final int sort;
155
156 /**
157 * A buffer containing the value of this field or method type. This value is an internal name for
158 * {@link #OBJECT} and {@link #INTERNAL} types, and a field or method descriptor in the other
159 * cases.
160 *
161 * <p>For {@link #OBJECT} types, this field also contains the descriptor: the characters in
162 * [{@link #valueBegin},{@link #valueEnd}) contain the internal name, and those in [{@link
163 * #valueBegin} - 1, {@link #valueEnd} + 1) contain the descriptor.
164 */
165 private final String valueBuffer;
166
167 /**
168 * The beginning index, inclusive, of the value of this Java field or method type in {@link
169 * #valueBuffer}. This value is an internal name for {@link #OBJECT} and {@link #INTERNAL} types,
170 * and a field or method descriptor in the other cases.
171 */
172 private final int valueBegin;
173
174 /**
175 * The end index, exclusive, of the value of this Java field or method type in {@link
176 * #valueBuffer}. This value is an internal name for {@link #OBJECT} and {@link #INTERNAL} types,
177 * and a field or method descriptor in the other cases.
178 */
179 private final int valueEnd;
180
181 /**
182 * Constructs a reference type.
183 *
184 * @param sort the sort of this type, see {@link #sort}.
185 * @param valueBuffer a buffer containing the value of this field or method type.
186 * @param valueBegin the beginning index, inclusive, of the value of this field or method type in
187 * valueBuffer.
188 * @param valueEnd the end index, exclusive, of the value of this field or method type in
189 * valueBuffer.
190 */
191 private Type(final int sort, final String valueBuffer, final int valueBegin, final int valueEnd) {
192 this.sort = sort;
193 this.valueBuffer = valueBuffer;
194 this.valueBegin = valueBegin;
195 this.valueEnd = valueEnd;
196 }
197
198 // -----------------------------------------------------------------------------------------------
199 // Methods to get Type(s) from a descriptor, a reflected Method or Constructor, other types, etc.
200 // -----------------------------------------------------------------------------------------------
201
202 /**
203 * Returns the {@link Type} corresponding to the given type descriptor.
204 *
205 * @param typeDescriptor a field or method type descriptor.
206 * @return the {@link Type} corresponding to the given type descriptor.
207 */
208 public static Type getType(final String typeDescriptor) {
209 return getTypeInternal(typeDescriptor, 0, typeDescriptor.length());
210 }
211
212 /**
213 * Returns the {@link Type} corresponding to the given class.
214 *
215 * @param clazz a class.
216 * @return the {@link Type} corresponding to the given class.
217 */
218 public static Type getType(final Class<?> clazz) {
219 if (clazz.isPrimitive()) {
220 if (clazz == Integer.TYPE) {
221 return INT_TYPE;
222 } else if (clazz == Void.TYPE) {
223 return VOID_TYPE;
224 } else if (clazz == Boolean.TYPE) {
225 return BOOLEAN_TYPE;
226 } else if (clazz == Byte.TYPE) {
227 return BYTE_TYPE;
228 } else if (clazz == Character.TYPE) {
229 return CHAR_TYPE;
230 } else if (clazz == Short.TYPE) {
231 return SHORT_TYPE;
232 } else if (clazz == Double.TYPE) {
233 return DOUBLE_TYPE;
234 } else if (clazz == Float.TYPE) {
235 return FLOAT_TYPE;
236 } else if (clazz == Long.TYPE) {
237 return LONG_TYPE;
238 } else {
239 throw new AssertionError();
240 }
241 } else {
242 return getType(getDescriptor(clazz));
243 }
244 }
245
246 /**
247 * Returns the method {@link Type} corresponding to the given constructor.
248 *
249 * @param constructor a {@link Constructor} object.
250 * @return the method {@link Type} corresponding to the given constructor.
251 */
252 public static Type getType(final Constructor<?> constructor) {
253 return getType(getConstructorDescriptor(constructor));
254 }
255
256 /**
257 * Returns the method {@link Type} corresponding to the given method.
258 *
259 * @param method a {@link Method} object.
260 * @return the method {@link Type} corresponding to the given method.
261 */
262 public static Type getType(final Method method) {
263 return getType(getMethodDescriptor(method));
264 }
265
266 /**
267 * Returns the type of the elements of this array type. This method should only be used for an
268 * array type.
269 *
270 * @return Returns the type of the elements of this array type.
271 */
272 public Type getElementType() {
273 final int numDimensions = getDimensions();
274 return getTypeInternal(valueBuffer, valueBegin + numDimensions, valueEnd);
275 }
276
277 /**
278 * Returns the {@link Type} corresponding to the given internal name.
279 *
280 * @param internalName an internal name.
281 * @return the {@link Type} corresponding to the given internal name.
282 */
283 public static Type getObjectType(final String internalName) {
284 return new Type(
285 internalName.charAt(0) == '[' ? ARRAY : INTERNAL, internalName, 0, internalName.length());
286 }
287
288 /**
289 * Returns the {@link Type} corresponding to the given method descriptor. Equivalent to <code>
290 * Type.getType(methodDescriptor)</code>.
291 *
292 * @param methodDescriptor a method descriptor.
293 * @return the {@link Type} corresponding to the given method descriptor.
294 */
295 public static Type getMethodType(final String methodDescriptor) {
296 return new Type(METHOD, methodDescriptor, 0, methodDescriptor.length());
297 }
298
299 /**
300 * Returns the method {@link Type} corresponding to the given argument and return types.
301 *
302 * @param returnType the return type of the method.
303 * @param argumentTypes the argument types of the method.
304 * @return the method {@link Type} corresponding to the given argument and return types.
305 */
306 public static Type getMethodType(final Type returnType, final Type... argumentTypes) {
307 return getType(getMethodDescriptor(returnType, argumentTypes));
308 }
309
310 /**
311 * Returns the argument types of methods of this type. This method should only be used for method
312 * types.
313 *
314 * @return the argument types of methods of this type.
315 */
316 public Type[] getArgumentTypes() {
317 return getArgumentTypes(getDescriptor());
318 }
319
320 /**
321 * Returns the {@link Type} values corresponding to the argument types of the given method
322 * descriptor.
323 *
324 * @param methodDescriptor a method descriptor.
325 * @return the {@link Type} values corresponding to the argument types of the given method
326 * descriptor.
327 */
328 public static Type[] getArgumentTypes(final String methodDescriptor) {
329 // First step: compute the number of argument types in methodDescriptor.
330 int numArgumentTypes = 0;
331 // Skip the first character, which is always a '('.
332 int currentOffset = 1;
333 // Parse the argument types, one at a each loop iteration.
334 while (methodDescriptor.charAt(currentOffset) != ')') {
335 while (methodDescriptor.charAt(currentOffset) == '[') {
336 currentOffset++;
337 }
338 char c = methodDescriptor.charAt(currentOffset++);
339 if (c == 'L' || c == 'Q') {
340 // Skip the argument descriptor content.
341 int semiColumnOffset = methodDescriptor.indexOf(';', currentOffset);
342 currentOffset = Math.max(currentOffset, semiColumnOffset + 1);
343 }
344 ++numArgumentTypes;
345 }
346
347 // Second step: create a Type instance for each argument type.
348 Type[] argumentTypes = new Type[numArgumentTypes];
349 // Skip the first character, which is always a '('.
350 currentOffset = 1;
351 // Parse and create the argument types, one at each loop iteration.
352 int currentArgumentTypeIndex = 0;
353 while (methodDescriptor.charAt(currentOffset) != ')') {
354 final int currentArgumentTypeOffset = currentOffset;
355 while (methodDescriptor.charAt(currentOffset) == '[') {
356 currentOffset++;
357 }
358 char c = methodDescriptor.charAt(currentOffset++);
359 if (c == 'L' || c == 'Q') {
360 // Skip the argument descriptor content.
361 int semiColumnOffset = methodDescriptor.indexOf(';', currentOffset);
362 currentOffset = Math.max(currentOffset, semiColumnOffset + 1);
363 }
364 argumentTypes[currentArgumentTypeIndex++] =
365 getTypeInternal(methodDescriptor, currentArgumentTypeOffset, currentOffset);
366 }
367 return argumentTypes;
368 }
369
370 /**
371 * Returns the {@link Type} values corresponding to the argument types of the given method.
372 *
373 * @param method a method.
374 * @return the {@link Type} values corresponding to the argument types of the given method.
375 */
376 public static Type[] getArgumentTypes(final Method method) {
377 Class<?>[] classes = method.getParameterTypes();
378 Type[] types = new Type[classes.length];
379 for (int i = classes.length - 1; i >= 0; --i) {
380 types[i] = getType(classes[i]);
381 }
382 return types;
383 }
384
385 /**
386 * Returns the return type of methods of this type. This method should only be used for method
387 * types.
388 *
389 * @return the return type of methods of this type.
390 */
391 public Type getReturnType() {
392 return getReturnType(getDescriptor());
393 }
394
395 /**
396 * Returns the {@link Type} corresponding to the return type of the given method descriptor.
397 *
398 * @param methodDescriptor a method descriptor.
399 * @return the {@link Type} corresponding to the return type of the given method descriptor.
400 */
401 public static Type getReturnType(final String methodDescriptor) {
402 return getTypeInternal(
403 methodDescriptor, getReturnTypeOffset(methodDescriptor), methodDescriptor.length());
404 }
405
406 /**
407 * Returns the {@link Type} corresponding to the return type of the given method.
408 *
409 * @param method a method.
410 * @return the {@link Type} corresponding to the return type of the given method.
411 */
412 public static Type getReturnType(final Method method) {
413 return getType(method.getReturnType());
414 }
415
416 /**
417 * Returns the start index of the return type of the given method descriptor.
418 *
419 * @param methodDescriptor a method descriptor.
420 * @return the start index of the return type of the given method descriptor.
421 */
422 static int getReturnTypeOffset(final String methodDescriptor) {
423 // Skip the first character, which is always a '('.
424 int currentOffset = 1;
425 // Skip the argument types, one at a each loop iteration.
426 while (methodDescriptor.charAt(currentOffset) != ')') {
427 while (methodDescriptor.charAt(currentOffset) == '[') {
428 currentOffset++;
429 }
430 char c = methodDescriptor.charAt(currentOffset++);
431 if (c == 'L' || c == 'Q') {
432 // Skip the argument descriptor content.
433 int semiColumnOffset = methodDescriptor.indexOf(';', currentOffset);
434 currentOffset = Math.max(currentOffset, semiColumnOffset + 1);
435 }
436 }
437 return currentOffset + 1;
438 }
439
440 /**
441 * Returns the {@link Type} corresponding to the given field or method descriptor.
442 *
443 * @param descriptorBuffer a buffer containing the field or method descriptor.
444 * @param descriptorBegin the beginning index, inclusive, of the field or method descriptor in
445 * descriptorBuffer.
446 * @param descriptorEnd the end index, exclusive, of the field or method descriptor in
447 * descriptorBuffer.
448 * @return the {@link Type} corresponding to the given type descriptor.
449 */
450 private static Type getTypeInternal(
451 final String descriptorBuffer, final int descriptorBegin, final int descriptorEnd) {
452 switch (descriptorBuffer.charAt(descriptorBegin)) {
453 case 'V':
454 return VOID_TYPE;
455 case 'Z':
456 return BOOLEAN_TYPE;
457 case 'C':
458 return CHAR_TYPE;
459 case 'B':
460 return BYTE_TYPE;
461 case 'S':
462 return SHORT_TYPE;
463 case 'I':
464 return INT_TYPE;
465 case 'F':
466 return FLOAT_TYPE;
467 case 'J':
468 return LONG_TYPE;
469 case 'D':
470 return DOUBLE_TYPE;
471 case '[':
472 return new Type(ARRAY, descriptorBuffer, descriptorBegin, descriptorEnd);
473 case 'L':
474 case 'Q':
475 return new Type(OBJECT, descriptorBuffer, descriptorBegin + 1, descriptorEnd - 1);
476 case '(':
477 return new Type(METHOD, descriptorBuffer, descriptorBegin, descriptorEnd);
478 default:
479 throw new IllegalArgumentException();
480 }
481 }
482
483 // -----------------------------------------------------------------------------------------------
484 // Methods to get class names, internal names or descriptors.
485 // -----------------------------------------------------------------------------------------------
486
487 /**
488 * Returns the binary name of the class corresponding to this type. This method must not be used
489 * on method types.
490 *
491 * @return the binary name of the class corresponding to this type.
492 */
493 public String getClassName() {
494 switch (sort) {
495 case VOID:
496 return "void";
497 case BOOLEAN:
498 return "boolean";
499 case CHAR:
500 return "char";
501 case BYTE:
502 return "byte";
503 case SHORT:
504 return "short";
505 case INT:
506 return "int";
507 case FLOAT:
508 return "float";
509 case LONG:
510 return "long";
511 case DOUBLE:
512 return "double";
513 case ARRAY:
514 StringBuilder stringBuilder = new StringBuilder(getElementType().getClassName());
515 for (int i = getDimensions(); i > 0; --i) {
516 stringBuilder.append("[]");
517 }
518 return stringBuilder.toString();
519 case OBJECT:
520 case INTERNAL:
521 return valueBuffer.substring(valueBegin, valueEnd).replace('/', '.');
522 default:
523 throw new AssertionError();
524 }
525 }
526
527 /**
528 * Returns the internal name of the class corresponding to this object or array type. The internal
529 * name of a class is its fully qualified name (as returned by Class.getName(), where '.' are
530 * replaced by '/'). This method should only be used for an object or array type.
531 *
532 * @return the internal name of the class corresponding to this object type.
533 */
534 public String getInternalName() {
535 return valueBuffer.substring(valueBegin, valueEnd);
536 }
537
538 /**
539 * Returns the internal name of the given class. The internal name of a class is its fully
540 * qualified name, as returned by Class.getName(), where '.' are replaced by '/'.
541 *
542 * @param clazz an object or array class.
543 * @return the internal name of the given class.
544 */
545 public static String getInternalName(final Class<?> clazz) {
546 return clazz.getName().replace('.', '/');
547 }
548
549 /**
550 * Returns the descriptor corresponding to this type.
551 *
552 * @return the descriptor corresponding to this type.
553 */
554 public String getDescriptor() {
555 if (sort == OBJECT) {
556 return valueBuffer.substring(valueBegin - 1, valueEnd + 1);
557 } else if (sort == INTERNAL) {
558 return 'L' + valueBuffer.substring(valueBegin, valueEnd) + ';';
559 } else {
560 return valueBuffer.substring(valueBegin, valueEnd);
561 }
562 }
563
564 /**
565 * Returns the descriptor corresponding to the given class.
566 *
567 * @param clazz an object class, a primitive class or an array class.
568 * @return the descriptor corresponding to the given class.
569 */
570 public static String getDescriptor(final Class<?> clazz) {
571 StringBuilder stringBuilder = new StringBuilder();
572 appendDescriptor(clazz, stringBuilder);
573 return stringBuilder.toString();
574 }
575
576 /**
577 * Returns the descriptor corresponding to the given constructor.
578 *
579 * @param constructor a {@link Constructor} object.
580 * @return the descriptor of the given constructor.
581 */
582 public static String getConstructorDescriptor(final Constructor<?> constructor) {
583 StringBuilder stringBuilder = new StringBuilder();
584 stringBuilder.append('(');
585 Class<?>[] parameters = constructor.getParameterTypes();
586 for (Class<?> parameter : parameters) {
587 appendDescriptor(parameter, stringBuilder);
588 }
589 return stringBuilder.append(")V").toString();
590 }
591
592 /**
593 * Returns the descriptor corresponding to the given argument and return types.
594 *
595 * @param returnType the return type of the method.
596 * @param argumentTypes the argument types of the method.
597 * @return the descriptor corresponding to the given argument and return types.
598 */
599 public static String getMethodDescriptor(final Type returnType, final Type... argumentTypes) {
600 StringBuilder stringBuilder = new StringBuilder();
601 stringBuilder.append('(');
602 for (Type argumentType : argumentTypes) {
603 argumentType.appendDescriptor(stringBuilder);
604 }
605 stringBuilder.append(')');
606 returnType.appendDescriptor(stringBuilder);
607 return stringBuilder.toString();
608 }
609
610 /**
611 * Returns the descriptor corresponding to the given method.
612 *
613 * @param method a {@link Method} object.
614 * @return the descriptor of the given method.
615 */
616 public static String getMethodDescriptor(final Method method) {
617 StringBuilder stringBuilder = new StringBuilder();
618 stringBuilder.append('(');
619 Class<?>[] parameters = method.getParameterTypes();
620 for (Class<?> parameter : parameters) {
621 appendDescriptor(parameter, stringBuilder);
622 }
623 stringBuilder.append(')');
624 appendDescriptor(method.getReturnType(), stringBuilder);
625 return stringBuilder.toString();
626 }
627
628 /**
629 * Appends the descriptor corresponding to this type to the given string buffer.
630 *
631 * @param stringBuilder the string builder to which the descriptor must be appended.
632 */
633 private void appendDescriptor(final StringBuilder stringBuilder) {
634 if (sort == OBJECT) {
635 stringBuilder.append(valueBuffer, valueBegin - 1, valueEnd + 1);
636 } else if (sort == INTERNAL) {
637 stringBuilder.append('L').append(valueBuffer, valueBegin, valueEnd).append(';');
638 } else {
639 stringBuilder.append(valueBuffer, valueBegin, valueEnd);
640 }
641 }
642
643 /**
644 * Appends the descriptor of the given class to the given string builder.
645 *
646 * @param clazz the class whose descriptor must be computed.
647 * @param stringBuilder the string builder to which the descriptor must be appended.
648 */
649 private static void appendDescriptor(final Class<?> clazz, final StringBuilder stringBuilder) {
650 Class<?> currentClass = clazz;
651 while (currentClass.isArray()) {
652 stringBuilder.append('[');
653 currentClass = currentClass.getComponentType();
654 }
655 if (currentClass.isPrimitive()) {
656 char descriptor;
657 if (currentClass == Integer.TYPE) {
658 descriptor = 'I';
659 } else if (currentClass == Void.TYPE) {
660 descriptor = 'V';
661 } else if (currentClass == Boolean.TYPE) {
662 descriptor = 'Z';
663 } else if (currentClass == Byte.TYPE) {
664 descriptor = 'B';
665 } else if (currentClass == Character.TYPE) {
666 descriptor = 'C';
667 } else if (currentClass == Short.TYPE) {
668 descriptor = 'S';
669 } else if (currentClass == Double.TYPE) {
670 descriptor = 'D';
671 } else if (currentClass == Float.TYPE) {
672 descriptor = 'F';
673 } else if (currentClass == Long.TYPE) {
674 descriptor = 'J';
675 } else {
676 throw new AssertionError();
677 }
678 stringBuilder.append(descriptor);
679 } else {
680 stringBuilder.append(isPrimitiveClass(currentClass) ? 'Q' : 'L').append(getInternalName(currentClass)).append(';');
681 }
682 }
683
684 static boolean isPrimitiveClass(Class<?> clazz) {
685 int mods = clazz.getModifiers();
686 return (mods & 0x00000100) != 0;
687 }
688
689 // -----------------------------------------------------------------------------------------------
690 // Methods to get the sort, dimension, size, and opcodes corresponding to a Type or descriptor.
691 // -----------------------------------------------------------------------------------------------
692
693 /**
694 * Returns the sort of this type.
695 *
696 * @return {@link #VOID}, {@link #BOOLEAN}, {@link #CHAR}, {@link #BYTE}, {@link #SHORT}, {@link
697 * #INT}, {@link #FLOAT}, {@link #LONG}, {@link #DOUBLE}, {@link #ARRAY}, {@link #OBJECT} or
698 * {@link #METHOD}.
699 */
700 public int getSort() {
701 return sort == INTERNAL ? OBJECT : sort;
702 }
703
704 /**
705 * Returns the number of dimensions of this array type. This method should only be used for an
706 * array type.
707 *
708 * @return the number of dimensions of this array type.
709 */
710 public int getDimensions() {
711 int numDimensions = 1;
712 while (valueBuffer.charAt(valueBegin + numDimensions) == '[') {
713 numDimensions++;
714 }
715 return numDimensions;
716 }
717
718 /**
719 * Returns the size of values of this type. This method must not be used for method types.
720 *
721 * @return the size of values of this type, i.e., 2 for {@code long} and {@code double}, 0 for
722 * {@code void} and 1 otherwise.
723 */
724 public int getSize() {
725 switch (sort) {
726 case VOID:
727 return 0;
728 case BOOLEAN:
729 case CHAR:
730 case BYTE:
731 case SHORT:
732 case INT:
733 case FLOAT:
734 case ARRAY:
735 case OBJECT:
736 case INTERNAL:
737 return 1;
738 case LONG:
739 case DOUBLE:
740 return 2;
741 default:
742 throw new AssertionError();
743 }
744 }
745
746 /**
747 * Returns the size of the arguments and of the return value of methods of this type. This method
748 * should only be used for method types.
749 *
750 * @return the size of the arguments of the method (plus one for the implicit this argument),
751 * argumentsSize, and the size of its return value, returnSize, packed into a single int i =
752 * {@code (argumentsSize << 2) | returnSize} (argumentsSize is therefore equal to {@code
753 * i >> 2}, and returnSize to {@code i & 0x03}).
754 */
755 public int getArgumentsAndReturnSizes() {
756 return getArgumentsAndReturnSizes(getDescriptor());
757 }
758
759 /**
760 * Computes the size of the arguments and of the return value of a method.
761 *
762 * @param methodDescriptor a method descriptor.
763 * @return the size of the arguments of the method (plus one for the implicit this argument),
764 * argumentsSize, and the size of its return value, returnSize, packed into a single int i =
765 * {@code (argumentsSize << 2) | returnSize} (argumentsSize is therefore equal to {@code
766 * i >> 2}, and returnSize to {@code i & 0x03}).
767 */
768 public static int getArgumentsAndReturnSizes(final String methodDescriptor) {
769 int argumentsSize = 1;
770 // Skip the first character, which is always a '('.
771 int currentOffset = 1;
772 int currentChar = methodDescriptor.charAt(currentOffset);
773 // Parse the argument types and compute their size, one at a each loop iteration.
774 while (currentChar != ')') {
775 if (currentChar == 'J' || currentChar == 'D') {
776 currentOffset++;
777 argumentsSize += 2;
778 } else {
779 while (methodDescriptor.charAt(currentOffset) == '[') {
780 currentOffset++;
781 }
782 char c = methodDescriptor.charAt(currentOffset++);
783 if (c == 'L' || c == 'Q') {
784 // Skip the argument descriptor content.
785 int semiColumnOffset = methodDescriptor.indexOf(';', currentOffset);
786 currentOffset = Math.max(currentOffset, semiColumnOffset + 1);
787 }
788 argumentsSize += 1;
789 }
790 currentChar = methodDescriptor.charAt(currentOffset);
791 }
792 currentChar = methodDescriptor.charAt(currentOffset + 1);
793 if (currentChar == 'V') {
794 return argumentsSize << 2;
795 } else {
796 int returnSize = (currentChar == 'J' || currentChar == 'D') ? 2 : 1;
797 return argumentsSize << 2 | returnSize;
798 }
799 }
800
801 /**
802 * Returns a JVM instruction opcode adapted to this {@link Type}. This method must not be used for
803 * method types.
804 *
805 * @param opcode a JVM instruction opcode. This opcode must be one of ILOAD, ISTORE, IALOAD,
806 * IASTORE, IADD, ISUB, IMUL, IDIV, IREM, INEG, ISHL, ISHR, IUSHR, IAND, IOR, IXOR and
807 * IRETURN.
808 * @return an opcode that is similar to the given opcode, but adapted to this {@link Type}. For
809 * example, if this type is {@code float} and {@code opcode} is IRETURN, this method returns
810 * FRETURN.
811 */
812 public int getOpcode(final int opcode) {
813 if (opcode == Opcodes.IALOAD || opcode == Opcodes.IASTORE) {
814 switch (sort) {
815 case BOOLEAN:
816 case BYTE:
817 return opcode + (Opcodes.BALOAD - Opcodes.IALOAD);
818 case CHAR:
819 return opcode + (Opcodes.CALOAD - Opcodes.IALOAD);
820 case SHORT:
821 return opcode + (Opcodes.SALOAD - Opcodes.IALOAD);
822 case INT:
823 return opcode;
824 case FLOAT:
825 return opcode + (Opcodes.FALOAD - Opcodes.IALOAD);
826 case LONG:
827 return opcode + (Opcodes.LALOAD - Opcodes.IALOAD);
828 case DOUBLE:
829 return opcode + (Opcodes.DALOAD - Opcodes.IALOAD);
830 case ARRAY:
831 case OBJECT:
832 case INTERNAL:
833 return opcode + (Opcodes.AALOAD - Opcodes.IALOAD);
834 case METHOD:
835 case VOID:
836 throw new UnsupportedOperationException();
837 default:
838 throw new AssertionError();
839 }
840 } else {
841 switch (sort) {
842 case VOID:
843 if (opcode != Opcodes.IRETURN) {
844 throw new UnsupportedOperationException();
845 }
846 return Opcodes.RETURN;
847 case BOOLEAN:
848 case BYTE:
849 case CHAR:
850 case SHORT:
851 case INT:
852 return opcode;
853 case FLOAT:
854 return opcode + (Opcodes.FRETURN - Opcodes.IRETURN);
855 case LONG:
856 return opcode + (Opcodes.LRETURN - Opcodes.IRETURN);
857 case DOUBLE:
858 return opcode + (Opcodes.DRETURN - Opcodes.IRETURN);
859 case ARRAY:
860 case OBJECT:
861 case INTERNAL:
862 if (opcode != Opcodes.ILOAD && opcode != Opcodes.ISTORE && opcode != Opcodes.IRETURN) {
863 throw new UnsupportedOperationException();
864 }
865 return opcode + (Opcodes.ARETURN - Opcodes.IRETURN);
866 case METHOD:
867 throw new UnsupportedOperationException();
868 default:
869 throw new AssertionError();
870 }
871 }
872 }
873
874 // -----------------------------------------------------------------------------------------------
875 // Equals, hashCode and toString.
876 // -----------------------------------------------------------------------------------------------
877
878 /**
879 * Tests if the given object is equal to this type.
880 *
881 * @param object the object to be compared to this type.
882 * @return {@literal true} if the given object is equal to this type.
883 */
884 @Override
885 public boolean equals(final Object object) {
886 if (this == object) {
887 return true;
888 }
889 if (!(object instanceof Type)) {
890 return false;
891 }
892 Type other = (Type) object;
893 if ((sort == INTERNAL ? OBJECT : sort) != (other.sort == INTERNAL ? OBJECT : other.sort)) {
894 return false;
895 }
896 int begin = valueBegin;
897 int end = valueEnd;
898 int otherBegin = other.valueBegin;
899 int otherEnd = other.valueEnd;
900 // Compare the values.
901 if (end - begin != otherEnd - otherBegin) {
902 return false;
903 }
904 for (int i = begin, j = otherBegin; i < end; i++, j++) {
905 if (valueBuffer.charAt(i) != other.valueBuffer.charAt(j)) {
906 return false;
907 }
908 }
909 return true;
910 }
911
912 /**
913 * Returns a hash code value for this type.
914 *
915 * @return a hash code value for this type.
916 */
917 @Override
918 public int hashCode() {
919 int hashCode = 13 * (sort == INTERNAL ? OBJECT : sort);
920 if (sort >= ARRAY) {
921 for (int i = valueBegin, end = valueEnd; i < end; i++) {
922 hashCode = 17 * (hashCode + valueBuffer.charAt(i));
923 }
924 }
925 return hashCode;
926 }
927
928 /**
929 * Returns a string representation of this type.
930 *
931 * @return the descriptor of this type.
932 */
933 @Override
934 public String toString() {
935 return getDescriptor();
936 }
937 }