1 /*
2 * Copyright (c) 2008, 2012, 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 sun.invoke.util;
27
28 public enum Wrapper {
29 // wrapperType primitiveType char zero emptyArray format
30 BOOLEAN( Boolean.class, boolean.class, 'Z', Boolean.FALSE, new boolean[0], Format.unsigned( 1)),
31 // These must be in the order defined for widening primitive conversions in JLS 5.1.2
32 // Avoid boxing integral types here to defer initialization of internal caches
33 BYTE ( Byte.class, byte.class, 'B', new Byte((byte)0), new byte[0], Format.signed( 8)),
34 SHORT ( Short.class, short.class, 'S', new Short((short)0), new short[0], Format.signed( 16)),
35 CHAR (Character.class, char.class, 'C', new Character((char)0), new char[0], Format.unsigned(16)),
36 INT ( Integer.class, int.class, 'I', new Integer(0), new int[0], Format.signed( 32)),
37 LONG ( Long.class, long.class, 'J', new Long(0), new long[0], Format.signed( 64)),
38 FLOAT ( Float.class, float.class, 'F', (Float)(float)0, new float[0], Format.floating(32)),
39 DOUBLE ( Double.class, double.class, 'D', (Double)(double)0, new double[0], Format.floating(64)),
40 OBJECT ( Object.class, Object.class, 'L', null, new Object[0], Format.other( 1)),
41 // VOID must be the last type, since it is "assignable" from any other type:
42 VOID ( Void.class, void.class, 'V', null, null, Format.other( 0)),
43 ;
44
45 private final Class<?> wrapperType;
46 private final Class<?> primitiveType;
47 private final char basicTypeChar;
48 private final Object zero;
49 private final Object emptyArray;
50 private final int format;
51 private final String wrapperSimpleName;
52 private final String primitiveSimpleName;
53
54 private Wrapper(Class<?> wtype, Class<?> ptype, char tchar, Object zero, Object emptyArray, int format) {
55 this.wrapperType = wtype;
56 this.primitiveType = ptype;
57 this.basicTypeChar = tchar;
58 this.zero = zero;
59 this.emptyArray = emptyArray;
60 this.format = format;
61 this.wrapperSimpleName = wtype.getSimpleName();
62 this.primitiveSimpleName = ptype.getSimpleName();
63 }
64
65 /** For debugging, give the details of this wrapper. */
66 public String detailString() {
67 return wrapperSimpleName+
68 java.util.Arrays.asList(wrapperType, primitiveType,
69 basicTypeChar, zero,
70 "0x"+Integer.toHexString(format));
71 }
72
73 private abstract static class Format {
74 static final int SLOT_SHIFT = 0, SIZE_SHIFT = 2, KIND_SHIFT = 12;
75 static final int
76 SIGNED = (-1) << KIND_SHIFT,
77 UNSIGNED = 0 << KIND_SHIFT,
78 FLOATING = 1 << KIND_SHIFT;
79 static final int
80 SLOT_MASK = ((1<<(SIZE_SHIFT-SLOT_SHIFT))-1),
81 SIZE_MASK = ((1<<(KIND_SHIFT-SIZE_SHIFT))-1);
82 static int format(int kind, int size, int slots) {
83 assert(((kind >> KIND_SHIFT) << KIND_SHIFT) == kind);
84 assert((size & (size-1)) == 0); // power of two
85 assert((kind == SIGNED) ? (size > 0) :
86 (kind == UNSIGNED) ? (size > 0) :
87 (kind == FLOATING) ? (size == 32 || size == 64) :
88 false);
89 assert((slots == 2) ? (size == 64) :
90 (slots == 1) ? (size <= 32) :
91 false);
92 return kind | (size << SIZE_SHIFT) | (slots << SLOT_SHIFT);
93 }
94 static final int
95 INT = SIGNED | (32 << SIZE_SHIFT) | (1 << SLOT_SHIFT),
96 SHORT = SIGNED | (16 << SIZE_SHIFT) | (1 << SLOT_SHIFT),
97 BOOLEAN = UNSIGNED | (1 << SIZE_SHIFT) | (1 << SLOT_SHIFT),
98 CHAR = UNSIGNED | (16 << SIZE_SHIFT) | (1 << SLOT_SHIFT),
99 FLOAT = FLOATING | (32 << SIZE_SHIFT) | (1 << SLOT_SHIFT),
100 VOID = UNSIGNED | (0 << SIZE_SHIFT) | (0 << SLOT_SHIFT),
101 NUM_MASK = (-1) << SIZE_SHIFT;
102 static int signed(int size) { return format(SIGNED, size, (size > 32 ? 2 : 1)); }
103 static int unsigned(int size) { return format(UNSIGNED, size, (size > 32 ? 2 : 1)); }
104 static int floating(int size) { return format(FLOATING, size, (size > 32 ? 2 : 1)); }
105 static int other(int slots) { return slots << SLOT_SHIFT; }
106 }
107
108 /// format queries:
109
110 /** How many bits are in the wrapped value? Returns 0 for OBJECT or VOID. */
111 public int bitWidth() { return (format >> Format.SIZE_SHIFT) & Format.SIZE_MASK; }
112 /** How many JVM stack slots occupied by the wrapped value? Returns 0 for VOID. */
113 public int stackSlots() { return (format >> Format.SLOT_SHIFT) & Format.SLOT_MASK; }
114 /** Does the wrapped value occupy a single JVM stack slot? */
115 public boolean isSingleWord() { return (format & (1 << Format.SLOT_SHIFT)) != 0; }
116 /** Does the wrapped value occupy two JVM stack slots? */
117 public boolean isDoubleWord() { return (format & (2 << Format.SLOT_SHIFT)) != 0; }
118 /** Is the wrapped type numeric (not void or object)? */
119 public boolean isNumeric() { return (format & Format.NUM_MASK) != 0; }
120 /** Is the wrapped type a primitive other than float, double, or void? */
121 public boolean isIntegral() { return isNumeric() && format < Format.FLOAT; }
122 /** Is the wrapped type one of int, boolean, byte, char, or short? */
123 public boolean isSubwordOrInt() { return isIntegral() && isSingleWord(); }
124 /* Is the wrapped value a signed integral type (one of byte, short, int, or long)? */
125 public boolean isSigned() { return format < Format.VOID; }
126 /* Is the wrapped value an unsigned integral type (one of boolean or char)? */
127 public boolean isUnsigned() { return format >= Format.BOOLEAN && format < Format.FLOAT; }
128 /** Is the wrapped type either float or double? */
129 public boolean isFloating() { return format >= Format.FLOAT; }
130 /** Is the wrapped type either void or a reference? */
131 public boolean isOther() { return (format & ~Format.SLOT_MASK) == 0; }
132
133 /** Does the JLS 5.1.2 allow a variable of this wrapper's
134 * primitive type to be assigned from a value of the given wrapper's primitive type?
135 * Cases:
136 * <ul>
137 * <li>unboxing followed by widening primitive conversion
138 * <li>any type converted to {@code void} (i.e., dropping a method call's value)
139 * <li>boxing conversion followed by widening reference conversion to {@code Object}
140 * </ul>
141 * These are the cases allowed by MethodHandle.asType.
142 */
143 public boolean isConvertibleFrom(Wrapper source) {
144 if (this == source) return true;
145 if (this.compareTo(source) < 0) {
146 // At best, this is a narrowing conversion.
147 return false;
148 }
149 // All conversions are allowed in the enum order between floats and signed ints.
150 // First detect non-signed non-float types (boolean, char, Object, void).
151 boolean floatOrSigned = (((this.format & source.format) & Format.SIGNED) != 0);
152 if (!floatOrSigned) {
153 if (this.isOther()) return true;
154 // can convert char to int or wider, but nothing else
155 if (source.format == Format.CHAR) return true;
156 // no other conversions are classified as widening
157 return false;
158 }
159 // All signed and float conversions in the enum order are widening.
160 assert(this.isFloating() || this.isSigned());
161 assert(source.isFloating() || source.isSigned());
162 return true;
163 }
164
165 static { assert(checkConvertibleFrom()); }
166 private static boolean checkConvertibleFrom() {
167 // Check the matrix for correct classification of widening conversions.
168 for (Wrapper w : values()) {
169 assert(w.isConvertibleFrom(w));
170 assert(VOID.isConvertibleFrom(w));
171 if (w != VOID) {
172 assert(OBJECT.isConvertibleFrom(w));
173 assert(!w.isConvertibleFrom(VOID));
174 }
175 // check relations with unsigned integral types:
176 if (w != CHAR) {
177 assert(!CHAR.isConvertibleFrom(w));
178 if (!w.isConvertibleFrom(INT))
179 assert(!w.isConvertibleFrom(CHAR));
180 }
181 if (w != BOOLEAN) {
182 assert(!BOOLEAN.isConvertibleFrom(w));
183 if (w != VOID && w != OBJECT)
184 assert(!w.isConvertibleFrom(BOOLEAN));
185 }
186 // check relations with signed integral types:
187 if (w.isSigned()) {
188 for (Wrapper x : values()) {
189 if (w == x) continue;
190 if (x.isFloating())
191 assert(!w.isConvertibleFrom(x));
192 else if (x.isSigned()) {
193 if (w.compareTo(x) < 0)
194 assert(!w.isConvertibleFrom(x));
195 else
196 assert(w.isConvertibleFrom(x));
197 }
198 }
199 }
200 // check relations with floating types:
201 if (w.isFloating()) {
202 for (Wrapper x : values()) {
203 if (w == x) continue;
204 if (x.isSigned())
205 assert(w.isConvertibleFrom(x));
206 else if (x.isFloating()) {
207 if (w.compareTo(x) < 0)
208 assert(!w.isConvertibleFrom(x));
209 else
210 assert(w.isConvertibleFrom(x));
211 }
212 }
213 }
214 }
215 return true; // i.e., assert(true)
216 }
217
218 /** Produce a zero value for the given wrapper type.
219 * This will be a numeric zero for a number or character,
220 * false for a boolean, and null for a reference or void.
221 * The common thread is that this is what is contained
222 * in a default-initialized variable of the given primitive
223 * type. (For void, it is what a reflective method returns
224 * instead of no value at all.)
225 */
226 public Object zero() { return zero; }
227
228 /** Produce a zero value for the given wrapper type T.
229 * The optional argument must a type compatible with this wrapper.
230 * Equivalent to {@code this.cast(this.zero(), type)}.
231 */
232 public <T> T zero(Class<T> type) { return convert(zero, type); }
233
234 /** Return the wrapper that wraps values of the given type.
235 * The type may be {@code Object}, meaning the {@code OBJECT} wrapper.
236 * Otherwise, the type must be a primitive.
237 * @throws IllegalArgumentException for unexpected types
238 */
239 public static Wrapper forPrimitiveType(Class<?> type) {
240 Wrapper w = findPrimitiveType(type);
241 if (w != null) return w;
242 if (type.isPrimitive())
243 throw new InternalError(); // redo hash function
244 throw newIllegalArgumentException("not primitive: "+type);
245 }
246
247 static Wrapper findPrimitiveType(Class<?> type) {
248 Wrapper w = FROM_PRIM[hashPrim(type)];
249 if (w != null && w.primitiveType == type) {
250 return w;
251 }
252 return null;
253 }
254
255 /** Return the wrapper that wraps values into the given wrapper type.
256 * If it is {@code Object}, return {@code OBJECT}.
257 * Otherwise, it must be a wrapper type.
258 * The type must not be a primitive type.
259 * @throws IllegalArgumentException for unexpected types
260 */
261 public static Wrapper forWrapperType(Class<?> type) {
262 Wrapper w = findWrapperType(type);
263 if (w != null) return w;
264 for (Wrapper x : values())
265 if (x.wrapperType == type)
266 throw new InternalError(); // redo hash function
267 throw newIllegalArgumentException("not wrapper: "+type);
268 }
269
270 static Wrapper findWrapperType(Class<?> type) {
271 Wrapper w = FROM_WRAP[hashWrap(type)];
272 if (w != null && w.wrapperType == type) {
273 return w;
274 }
275 return null;
276 }
277
278 /** Return the wrapper that corresponds to the given bytecode
279 * signature character. Return {@code OBJECT} for the character 'L'.
280 * @throws IllegalArgumentException for any non-signature character or {@code '['}.
281 */
282 public static Wrapper forBasicType(char type) {
283 Wrapper w = FROM_CHAR[hashChar(type)];
284 if (w != null && w.basicTypeChar == type) {
285 return w;
286 }
287 for (Wrapper x : values())
288 if (w.basicTypeChar == type)
289 throw new InternalError(); // redo hash function
290 throw newIllegalArgumentException("not basic type char: "+type);
291 }
292
293 /** Return the wrapper for the given type, if it is
294 * a primitive type, else return {@code OBJECT}.
295 */
296 public static Wrapper forBasicType(Class<?> type) {
297 if (type.isPrimitive())
298 return forPrimitiveType(type);
299 return OBJECT; // any reference, including wrappers or arrays
300 }
301
302 // Note on perfect hashes:
303 // for signature chars c, do (c + (c >> 1)) % 16
304 // for primitive type names n, do (n[0] + n[2]) % 16
305 // The type name hash works for both primitive and wrapper names.
306 // You can add "java/lang/Object" to the primitive names.
307 // But you add the wrapper name Object, use (n[2] + (3*n[1])) % 16.
308 private static final Wrapper[] FROM_PRIM = new Wrapper[16];
309 private static final Wrapper[] FROM_WRAP = new Wrapper[16];
310 private static final Wrapper[] FROM_CHAR = new Wrapper[16];
311 private static int hashPrim(Class<?> x) {
312 String xn = x.getName();
313 if (xn.length() < 3) return 0;
314 return (xn.charAt(0) + xn.charAt(2)) % 16;
315 }
316 private static int hashWrap(Class<?> x) {
317 String xn = x.getName();
318 final int offset = 10; assert(offset == "java.lang.".length());
319 if (xn.length() < offset+3) return 0;
320 return (3*xn.charAt(offset+1) + xn.charAt(offset+2)) % 16;
321 }
322 private static int hashChar(char x) {
323 return (x + (x >> 1)) % 16;
324 }
325 static {
326 for (Wrapper w : values()) {
327 int pi = hashPrim(w.primitiveType);
328 int wi = hashWrap(w.wrapperType);
329 int ci = hashChar(w.basicTypeChar);
330 assert(FROM_PRIM[pi] == null);
331 assert(FROM_WRAP[wi] == null);
332 assert(FROM_CHAR[ci] == null);
333 FROM_PRIM[pi] = w;
334 FROM_WRAP[wi] = w;
335 FROM_CHAR[ci] = w;
336 }
337 //assert(jdk.sun.invoke.util.WrapperTest.test(false));
338 }
339
340 /** What is the primitive type wrapped by this wrapper? */
341 public Class<?> primitiveType() { return primitiveType; }
342
343 /** What is the wrapper type for this wrapper? */
344 public Class<?> wrapperType() { return wrapperType; }
345
346 /** What is the wrapper type for this wrapper?
347 * Otherwise, the example type must be the wrapper type,
348 * or the corresponding primitive type.
349 * (For {@code OBJECT}, the example type can be any non-primitive,
350 * and is normalized to {@code Object.class}.)
351 * The resulting class type has the same type parameter.
352 */
353 public <T> Class<T> wrapperType(Class<T> exampleType) {
354 if (exampleType == wrapperType) {
355 return exampleType;
356 } else if (exampleType == primitiveType ||
357 wrapperType == Object.class ||
358 exampleType.isInterface()) {
359 return forceType(wrapperType, exampleType);
360 }
361 throw newClassCastException(exampleType, primitiveType);
362 }
363
364 private static ClassCastException newClassCastException(Class<?> actual, Class<?> expected) {
365 return new ClassCastException(actual + " is not compatible with " + expected);
366 }
367
368 /** If {@code type} is a primitive type, return the corresponding
369 * wrapper type, else return {@code type} unchanged.
370 */
371 public static <T> Class<T> asWrapperType(Class<T> type) {
372 if (type.isPrimitive()) {
373 return forPrimitiveType(type).wrapperType(type);
374 }
375 return type;
376 }
377
378 /** If {@code type} is a wrapper type, return the corresponding
379 * primitive type, else return {@code type} unchanged.
380 */
381 public static <T> Class<T> asPrimitiveType(Class<T> type) {
382 Wrapper w = findWrapperType(type);
383 if (w != null) {
384 return forceType(w.primitiveType(), type);
385 }
386 return type;
387 }
388
389 /** Query: Is the given type a wrapper, such as {@code Integer} or {@code Void}? */
390 public static boolean isWrapperType(Class<?> type) {
391 return findWrapperType(type) != null;
392 }
393
394 /** Query: Is the given type a primitive, such as {@code int} or {@code void}? */
395 public static boolean isPrimitiveType(Class<?> type) {
396 return type.isPrimitive();
397 }
398
399 /** What is the bytecode signature character for this type?
400 * All non-primitives, including array types, report as 'L', the signature character for references.
401 */
402 public static char basicTypeChar(Class<?> type) {
403 if (!type.isPrimitive())
404 return 'L';
405 else
406 return forPrimitiveType(type).basicTypeChar();
407 }
408
409 /** What is the bytecode signature character for this wrapper's
410 * primitive type?
411 */
412 public char basicTypeChar() { return basicTypeChar; }
413
414 /** What is the simple name of the wrapper type?
415 */
416 public String wrapperSimpleName() { return wrapperSimpleName; }
417
418 /** What is the simple name of the primitive type?
419 */
420 public String primitiveSimpleName() { return primitiveSimpleName; }
421
422 // /** Wrap a value in the given type, which may be either a primitive or wrapper type.
423 // * Performs standard primitive conversions, including truncation and float conversions.
424 // */
425 // public static <T> T wrap(Object x, Class<T> type) {
426 // return Wrapper.valueOf(type).cast(x, type);
427 // }
428
429 /** Cast a wrapped value to the given type, which may be either a primitive or wrapper type.
430 * The given target type must be this wrapper's primitive or wrapper type.
431 * If this wrapper is OBJECT, the target type may also be an interface, perform no runtime check.
432 * Performs standard primitive conversions, including truncation and float conversions.
433 * The given type must be compatible with this wrapper. That is, it must either
434 * be the wrapper type (or a subtype, in the case of {@code OBJECT}) or else
435 * it must be the wrapper's primitive type.
436 * Primitive conversions are only performed if the given type is itself a primitive.
437 * @throws ClassCastException if the given type is not compatible with this wrapper
438 */
439 public <T> T cast(Object x, Class<T> type) {
440 return convert(x, type, true);
441 }
442
443 /** Convert a wrapped value to the given type.
444 * The given target type must be this wrapper's primitive or wrapper type.
445 * This is equivalent to {@link #cast}, except that it refuses to perform
446 * narrowing primitive conversions.
447 */
448 public <T> T convert(Object x, Class<T> type) {
449 return convert(x, type, false);
450 }
451
452 private <T> T convert(Object x, Class<T> type, boolean isCast) {
453 if (this == OBJECT) {
454 // If the target wrapper is OBJECT, just do a reference cast.
455 // If the target type is an interface, perform no runtime check.
456 // (This loophole is safe, and is allowed by the JVM verifier.)
457 // If the target type is a primitive, change it to a wrapper.
458 assert(!type.isPrimitive());
459 if (!type.isInterface())
460 type.cast(x);
461 @SuppressWarnings("unchecked")
462 T result = (T) x; // unchecked warning is expected here
463 return result;
464 }
465 Class<T> wtype = wrapperType(type);
466 if (wtype.isInstance(x)) {
467 return wtype.cast(x);
468 }
469 if (!isCast) {
470 Class<?> sourceType = x.getClass(); // throw NPE if x is null
471 Wrapper source = findWrapperType(sourceType);
472 if (source == null || !this.isConvertibleFrom(source)) {
473 throw newClassCastException(wtype, sourceType);
474 }
475 } else if (x == null) {
476 @SuppressWarnings("unchecked")
477 T z = (T) zero;
478 return z;
479 }
480 @SuppressWarnings("unchecked")
481 T result = (T) wrap(x); // unchecked warning is expected here
482 assert (result == null ? Void.class : result.getClass()) == wtype;
483 return result;
484 }
485
486 /** Cast a reference type to another reference type.
487 * If the target type is an interface, perform no runtime check.
488 * (This loophole is safe, and is allowed by the JVM verifier.)
489 * If the target type is a primitive, change it to a wrapper.
490 */
491 static <T> Class<T> forceType(Class<?> type, Class<T> exampleType) {
492 boolean z = (type == exampleType ||
493 type.isPrimitive() && forPrimitiveType(type) == findWrapperType(exampleType) ||
494 exampleType.isPrimitive() && forPrimitiveType(exampleType) == findWrapperType(type) ||
495 type == Object.class && !exampleType.isPrimitive());
496 if (!z)
497 System.out.println(type+" <= "+exampleType);
498 assert(type == exampleType ||
499 type.isPrimitive() && forPrimitiveType(type) == findWrapperType(exampleType) ||
500 exampleType.isPrimitive() && forPrimitiveType(exampleType) == findWrapperType(type) ||
501 type == Object.class && !exampleType.isPrimitive());
502 @SuppressWarnings("unchecked")
503 Class<T> result = (Class<T>) type; // unchecked warning is expected here
504 return result;
505 }
506
507 /** Wrap a value in this wrapper's type.
508 * Performs standard primitive conversions, including truncation and float conversions.
509 * Performs returns the unchanged reference for {@code OBJECT}.
510 * Returns null for {@code VOID}.
511 * Returns a zero value for a null input.
512 * @throws ClassCastException if this wrapper is numeric and the operand
513 * is not a number, character, boolean, or null
514 */
515 public Object wrap(Object x) {
516 // do non-numeric wrappers first
517 switch (basicTypeChar) {
518 case 'L': return x;
519 case 'V': return null;
520 }
521 Number xn = numberValue(x);
522 switch (basicTypeChar) {
523 case 'I': return Integer.valueOf(xn.intValue());
524 case 'J': return Long.valueOf(xn.longValue());
525 case 'F': return Float.valueOf(xn.floatValue());
526 case 'D': return Double.valueOf(xn.doubleValue());
527 case 'S': return Short.valueOf((short) xn.intValue());
528 case 'B': return Byte.valueOf((byte) xn.intValue());
529 case 'C': return Character.valueOf((char) xn.intValue());
530 case 'Z': return Boolean.valueOf(boolValue(xn.byteValue()));
531 }
532 throw new InternalError("bad wrapper");
533 }
534
535 /** Wrap a value (an int or smaller value) in this wrapper's type.
536 * Performs standard primitive conversions, including truncation and float conversions.
537 * Produces an {@code Integer} for {@code OBJECT}, although the exact type
538 * of the operand is not known.
539 * Returns null for {@code VOID}.
540 */
541 public Object wrap(int x) {
542 if (basicTypeChar == 'L') return (Integer)x;
543 switch (basicTypeChar) {
544 case 'L': throw newIllegalArgumentException("cannot wrap to object type");
545 case 'V': return null;
546 case 'I': return Integer.valueOf(x);
547 case 'J': return Long.valueOf(x);
548 case 'F': return Float.valueOf(x);
549 case 'D': return Double.valueOf(x);
550 case 'S': return Short.valueOf((short) x);
551 case 'B': return Byte.valueOf((byte) x);
552 case 'C': return Character.valueOf((char) x);
553 case 'Z': return Boolean.valueOf(boolValue((byte) x));
554 }
555 throw new InternalError("bad wrapper");
556 }
557
558 private static Number numberValue(Object x) {
559 if (x instanceof Number) return (Number)x;
560 if (x instanceof Character) return (int)(Character)x;
561 if (x instanceof Boolean) return (Boolean)x ? 1 : 0;
562 // Remaining allowed case of void: Must be a null reference.
563 return (Number)x;
564 }
565
566 // Parameter type of boolValue must be byte, because
567 // MethodHandles.explicitCastArguments defines boolean
568 // conversion as first converting to byte.
569 private static boolean boolValue(byte bits) {
570 bits &= 1; // simple 31-bit zero extension
571 return (bits != 0);
572 }
573
574 private static RuntimeException newIllegalArgumentException(String message, Object x) {
575 return newIllegalArgumentException(message + x);
576 }
577 private static RuntimeException newIllegalArgumentException(String message) {
578 return new IllegalArgumentException(message);
579 }
580
581 // primitive array support
582 public Object makeArray(int len) {
583 return java.lang.reflect.Array.newInstance(primitiveType, len);
584 }
585 public Class<?> arrayType() {
586 return emptyArray.getClass();
587 }
588 public void copyArrayUnboxing(Object[] values, int vpos, Object a, int apos, int length) {
589 if (a.getClass() != arrayType())
590 arrayType().cast(a); // throw NPE or CCE if bad type
591 for (int i = 0; i < length; i++) {
592 Object value = values[i+vpos];
593 value = convert(value, primitiveType);
594 java.lang.reflect.Array.set(a, i+apos, value);
595 }
596 }
597 public void copyArrayBoxing(Object a, int apos, Object[] values, int vpos, int length) {
598 if (a.getClass() != arrayType())
599 arrayType().cast(a); // throw NPE or CCE if bad type
600 for (int i = 0; i < length; i++) {
601 Object value = java.lang.reflect.Array.get(a, i+apos);
602 //Already done: value = convert(value, primitiveType);
603 assert(value.getClass() == wrapperType);
604 values[i+vpos] = value;
605 }
606 }
607 }