1 /*
2 * Copyright (c) 1997, 2015, 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
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/verifier.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "interpreter/linkResolver.hpp"
32 #include "memory/oopFactory.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/instanceKlass.hpp"
36 #include "oops/objArrayKlass.hpp"
37 #include "oops/objArrayOop.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvm.h"
40 #include "prims/jvmtiExport.hpp"
41 #include "runtime/arguments.hpp"
42 #include "runtime/handles.inline.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/reflection.hpp"
45 #include "runtime/reflectionUtils.hpp"
46 #include "runtime/signature.hpp"
47 #include "runtime/vframe.hpp"
48
49 static void trace_class_resolution(Klass* to_class) {
50 ResourceMark rm;
51 int line_number = -1;
52 const char * source_file = NULL;
53 Klass* caller = NULL;
54 JavaThread* jthread = JavaThread::current();
55 if (jthread->has_last_Java_frame()) {
56 vframeStream vfst(jthread);
57 // skip over any frames belonging to java.lang.Class
58 while (!vfst.at_end() &&
59 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class()) {
60 vfst.next();
61 }
62 if (!vfst.at_end()) {
63 // this frame is a likely suspect
64 caller = vfst.method()->method_holder();
65 line_number = vfst.method()->line_number_from_bci(vfst.bci());
66 Symbol* s = vfst.method()->method_holder()->source_file_name();
67 if (s != NULL) {
68 source_file = s->as_C_string();
69 }
70 }
71 }
72 if (caller != NULL) {
73 const char * from = caller->external_name();
74 const char * to = to_class->external_name();
75 // print in a single call to reduce interleaving between threads
76 if (source_file != NULL) {
77 tty->print("RESOLVE %s %s %s:%d (reflection)\n", from, to, source_file, line_number);
78 } else {
79 tty->print("RESOLVE %s %s (reflection)\n", from, to);
80 }
81 }
82 }
83
84
85 oop Reflection::box(jvalue* value, BasicType type, TRAPS) {
86 if (type == T_VOID) {
87 return NULL;
88 }
89 if (type == T_OBJECT || type == T_ARRAY) {
90 // regular objects are not boxed
91 return (oop) value->l;
92 }
93 oop result = java_lang_boxing_object::create(type, value, CHECK_NULL);
94 if (result == NULL) {
95 THROW_(vmSymbols::java_lang_IllegalArgumentException(), result);
96 }
97 return result;
98 }
99
100
101 BasicType Reflection::unbox_for_primitive(oop box, jvalue* value, TRAPS) {
102 if (box == NULL) {
103 THROW_(vmSymbols::java_lang_IllegalArgumentException(), T_ILLEGAL);
104 }
105 return java_lang_boxing_object::get_value(box, value);
106 }
107
108 BasicType Reflection::unbox_for_regular_object(oop box, jvalue* value) {
109 // Note: box is really the unboxed oop. It might even be a Short, etc.!
110 value->l = (jobject) box;
111 return T_OBJECT;
112 }
113
114
115 void Reflection::widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS) {
116 assert(wide_type != current_type, "widen should not be called with identical types");
117 switch (wide_type) {
118 case T_BOOLEAN:
119 case T_BYTE:
120 case T_CHAR:
121 break; // fail
122 case T_SHORT:
123 switch (current_type) {
124 case T_BYTE:
125 value->s = (jshort) value->b;
126 return;
127 }
128 break; // fail
129 case T_INT:
130 switch (current_type) {
131 case T_BYTE:
132 value->i = (jint) value->b;
133 return;
134 case T_CHAR:
135 value->i = (jint) value->c;
136 return;
137 case T_SHORT:
138 value->i = (jint) value->s;
139 return;
140 }
141 break; // fail
142 case T_LONG:
143 switch (current_type) {
144 case T_BYTE:
145 value->j = (jlong) value->b;
146 return;
147 case T_CHAR:
148 value->j = (jlong) value->c;
149 return;
150 case T_SHORT:
151 value->j = (jlong) value->s;
152 return;
153 case T_INT:
154 value->j = (jlong) value->i;
155 return;
156 }
157 break; // fail
158 case T_FLOAT:
159 switch (current_type) {
160 case T_BYTE:
161 value->f = (jfloat) value->b;
162 return;
163 case T_CHAR:
164 value->f = (jfloat) value->c;
165 return;
166 case T_SHORT:
167 value->f = (jfloat) value->s;
168 return;
169 case T_INT:
170 value->f = (jfloat) value->i;
171 return;
172 case T_LONG:
173 value->f = (jfloat) value->j;
174 return;
175 }
176 break; // fail
177 case T_DOUBLE:
178 switch (current_type) {
179 case T_BYTE:
180 value->d = (jdouble) value->b;
181 return;
182 case T_CHAR:
183 value->d = (jdouble) value->c;
184 return;
185 case T_SHORT:
186 value->d = (jdouble) value->s;
187 return;
188 case T_INT:
189 value->d = (jdouble) value->i;
190 return;
191 case T_FLOAT:
192 value->d = (jdouble) value->f;
193 return;
194 case T_LONG:
195 value->d = (jdouble) value->j;
196 return;
197 }
198 break; // fail
199 default:
200 break; // fail
201 }
202 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
203 }
204
205
206 BasicType Reflection::array_get(jvalue* value, arrayOop a, int index, TRAPS) {
207 if (!a->is_within_bounds(index)) {
208 THROW_(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), T_ILLEGAL);
209 }
210 if (a->is_objArray()) {
211 value->l = (jobject) objArrayOop(a)->obj_at(index);
212 return T_OBJECT;
213 } else {
214 assert(a->is_typeArray(), "just checking");
215 BasicType type = TypeArrayKlass::cast(a->klass())->element_type();
216 switch (type) {
217 case T_BOOLEAN:
218 value->z = typeArrayOop(a)->bool_at(index);
219 break;
220 case T_CHAR:
221 value->c = typeArrayOop(a)->char_at(index);
222 break;
223 case T_FLOAT:
224 value->f = typeArrayOop(a)->float_at(index);
225 break;
226 case T_DOUBLE:
227 value->d = typeArrayOop(a)->double_at(index);
228 break;
229 case T_BYTE:
230 value->b = typeArrayOop(a)->byte_at(index);
231 break;
232 case T_SHORT:
233 value->s = typeArrayOop(a)->short_at(index);
234 break;
235 case T_INT:
236 value->i = typeArrayOop(a)->int_at(index);
237 break;
238 case T_LONG:
239 value->j = typeArrayOop(a)->long_at(index);
240 break;
241 default:
242 return T_ILLEGAL;
243 }
244 return type;
245 }
246 }
247
248
249 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) {
250 if (!a->is_within_bounds(index)) {
251 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
252 }
253 if (a->is_objArray()) {
254 if (value_type == T_OBJECT) {
255 oop obj = (oop) value->l;
256 if (obj != NULL) {
257 Klass* element_klass = ObjArrayKlass::cast(a->klass())->element_klass();
258 if (!obj->is_a(element_klass)) {
259 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array element type mismatch");
260 }
261 }
262 objArrayOop(a)->obj_at_put(index, obj);
263 }
264 } else {
265 assert(a->is_typeArray(), "just checking");
266 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
267 if (array_type != value_type) {
268 // The widen operation can potentially throw an exception, but cannot block,
269 // so typeArrayOop a is safe if the call succeeds.
270 widen(value, value_type, array_type, CHECK);
271 }
272 switch (array_type) {
273 case T_BOOLEAN:
274 typeArrayOop(a)->bool_at_put(index, value->z);
275 break;
276 case T_CHAR:
277 typeArrayOop(a)->char_at_put(index, value->c);
278 break;
279 case T_FLOAT:
280 typeArrayOop(a)->float_at_put(index, value->f);
281 break;
282 case T_DOUBLE:
283 typeArrayOop(a)->double_at_put(index, value->d);
284 break;
285 case T_BYTE:
286 typeArrayOop(a)->byte_at_put(index, value->b);
287 break;
288 case T_SHORT:
289 typeArrayOop(a)->short_at_put(index, value->s);
290 break;
291 case T_INT:
292 typeArrayOop(a)->int_at_put(index, value->i);
293 break;
294 case T_LONG:
295 typeArrayOop(a)->long_at_put(index, value->j);
296 break;
297 default:
298 THROW(vmSymbols::java_lang_IllegalArgumentException());
299 }
300 }
301 }
302
303
304 Klass* Reflection::basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
305 assert(java_lang_Class::is_primitive(basic_type_mirror), "just checking");
306 BasicType type = java_lang_Class::primitive_type(basic_type_mirror);
307 if (type == T_VOID) {
308 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
309 } else {
310 return Universe::typeArrayKlassObj(type);
311 }
312 }
313
314
315 oop Reflection:: basic_type_arrayklass_to_mirror(Klass* basic_type_arrayklass, TRAPS) {
316 BasicType type = TypeArrayKlass::cast(basic_type_arrayklass)->element_type();
317 return Universe::java_mirror(type);
318 }
319
320
321 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
322 if (element_mirror == NULL) {
323 THROW_0(vmSymbols::java_lang_NullPointerException());
324 }
325 if (length < 0) {
326 THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
327 }
328 if (java_lang_Class::is_primitive(element_mirror)) {
329 Klass* tak = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
330 return TypeArrayKlass::cast(tak)->allocate(length, THREAD);
331 } else {
332 Klass* k = java_lang_Class::as_Klass(element_mirror);
333 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
334 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
335 }
336 return oopFactory::new_objArray(k, length, THREAD);
337 }
338 }
339
340
341 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
342 assert(dim_array->is_typeArray(), "just checking");
343 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
344
345 if (element_mirror == NULL) {
346 THROW_0(vmSymbols::java_lang_NullPointerException());
347 }
348
349 int len = dim_array->length();
350 if (len <= 0 || len > MAX_DIM) {
351 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
352 }
353
354 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
355 for (int i = 0; i < len; i++) {
356 int d = dim_array->int_at(i);
357 if (d < 0) {
358 THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
359 }
360 dimensions[i] = d;
361 }
362
363 Klass* klass;
364 int dim = len;
365 if (java_lang_Class::is_primitive(element_mirror)) {
366 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
367 } else {
368 klass = java_lang_Class::as_Klass(element_mirror);
369 if (klass->is_array_klass()) {
370 int k_dim = ArrayKlass::cast(klass)->dimension();
371 if (k_dim + len > MAX_DIM) {
372 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
373 }
374 dim += k_dim;
375 }
376 }
377 klass = klass->array_klass(dim, CHECK_NULL);
378 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
379 assert(obj->is_array(), "just checking");
380 return arrayOop(obj);
381 }
382
383
384 oop Reflection::array_component_type(oop mirror, TRAPS) {
385 if (java_lang_Class::is_primitive(mirror)) {
386 return NULL;
387 }
388
389 Klass* klass = java_lang_Class::as_Klass(mirror);
390 if (!klass->is_array_klass()) {
391 return NULL;
392 }
393
394 oop result = java_lang_Class::component_mirror(mirror);
395 #ifdef ASSERT
396 oop result2 = NULL;
397 if (ArrayKlass::cast(klass)->dimension() == 1) {
398 if (klass->is_typeArray_klass()) {
399 result2 = basic_type_arrayklass_to_mirror(klass, CHECK_NULL);
400 } else {
401 result2 = ObjArrayKlass::cast(klass)->element_klass()->java_mirror();
402 }
403 } else {
404 Klass* lower_dim = ArrayKlass::cast(klass)->lower_dimension();
405 assert(lower_dim->is_array_klass(), "just checking");
406 result2 = lower_dim->java_mirror();
407 }
408 assert(result == result2, "results must be consistent");
409 #endif //ASSERT
410 return result;
411 }
412
413
414 bool Reflection::verify_class_access(Klass* current_class, Klass* new_class, bool classloader_only) {
415 // Verify that current_class can access new_class. If the classloader_only
416 // flag is set, we automatically allow any accesses in which current_class
417 // doesn't have a classloader.
418 if ((current_class == NULL) ||
419 (current_class == new_class) ||
420 (new_class->is_public()) ||
421 is_same_class_package(current_class, new_class)) {
422 return true;
423 }
424 // Allow all accesses from sun/reflect/MagicAccessorImpl subclasses to
425 // succeed trivially.
426 if (current_class->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass())) {
427 return true;
428 }
429
430 return can_relax_access_check_for(current_class, new_class, classloader_only);
431 }
432
433 static bool under_host_klass(InstanceKlass* ik, Klass* host_klass) {
434 DEBUG_ONLY(int inf_loop_check = 1000 * 1000 * 1000);
435 for (;;) {
436 Klass* hc = (Klass*) ik->host_klass();
437 if (hc == NULL) return false;
438 if (hc == host_klass) return true;
439 ik = InstanceKlass::cast(hc);
440
441 // There's no way to make a host class loop short of patching memory.
442 // Therefore there cannot be a loop here unless there's another bug.
443 // Still, let's check for it.
444 assert(--inf_loop_check > 0, "no host_klass loop");
445 }
446 }
447
448 bool Reflection::can_relax_access_check_for(
449 Klass* accessor, Klass* accessee, bool classloader_only) {
450 InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
451 InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
452
453 // If either is on the other's host_klass chain, access is OK,
454 // because one is inside the other.
455 if (under_host_klass(accessor_ik, accessee) ||
456 under_host_klass(accessee_ik, accessor))
457 return true;
458
459 if ((RelaxAccessControlCheck &&
460 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
461 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) ||
462 (accessor_ik->major_version() < Verifier::STRICTER_ACCESS_CTRL_CHECK_VERSION &&
463 accessee_ik->major_version() < Verifier::STRICTER_ACCESS_CTRL_CHECK_VERSION)) {
464 return classloader_only &&
465 Verifier::relax_verify_for(accessor_ik->class_loader()) &&
466 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
467 accessor_ik->class_loader() == accessee_ik->class_loader();
468 } else {
469 return false;
470 }
471 }
472
473 bool Reflection::verify_field_access(Klass* current_class,
474 Klass* resolved_class,
475 Klass* field_class,
476 AccessFlags access,
477 bool classloader_only,
478 bool protected_restriction) {
479 // Verify that current_class can access a field of field_class, where that
480 // field's access bits are "access". We assume that we've already verified
481 // that current_class can access field_class.
482 //
483 // If the classloader_only flag is set, we automatically allow any accesses
484 // in which current_class doesn't have a classloader.
485 //
486 // "resolved_class" is the runtime type of "field_class". Sometimes we don't
487 // need this distinction (e.g. if all we have is the runtime type, or during
488 // class file parsing when we only care about the static type); in that case
489 // callers should ensure that resolved_class == field_class.
490 //
491 if ((current_class == NULL) ||
492 (current_class == field_class) ||
493 access.is_public()) {
494 return true;
495 }
496
497 Klass* host_class = current_class;
498 while (host_class->is_instance_klass() &&
499 InstanceKlass::cast(host_class)->is_anonymous()) {
500 Klass* next_host_class = InstanceKlass::cast(host_class)->host_klass();
501 if (next_host_class == NULL) break;
502 host_class = next_host_class;
503 }
504 if (host_class == field_class) {
505 return true;
506 }
507
508 if (access.is_protected()) {
509 if (!protected_restriction) {
510 // See if current_class (or outermost host class) is a subclass of field_class
511 // An interface may not access protected members of j.l.Object
512 if (!host_class->is_interface() && host_class->is_subclass_of(field_class)) {
513 if (access.is_static() || // static fields are ok, see 6622385
514 current_class == resolved_class ||
515 field_class == resolved_class ||
516 host_class->is_subclass_of(resolved_class) ||
517 resolved_class->is_subclass_of(host_class)) {
518 return true;
519 }
520 }
521 }
522 }
523
524 if (!access.is_private() && is_same_class_package(current_class, field_class)) {
525 return true;
526 }
527
528 // Allow all accesses from sun/reflect/MagicAccessorImpl subclasses to
529 // succeed trivially.
530 if (current_class->is_subclass_of(SystemDictionary::reflect_MagicAccessorImpl_klass())) {
531 return true;
532 }
533
534 return can_relax_access_check_for(
535 current_class, field_class, classloader_only);
536 }
537
538
539 bool Reflection::is_same_class_package(Klass* class1, Klass* class2) {
540 return InstanceKlass::cast(class1)->is_same_class_package(class2);
541 }
542
543 bool Reflection::is_same_package_member(Klass* class1, Klass* class2, TRAPS) {
544 return InstanceKlass::cast(class1)->is_same_package_member(class2, THREAD);
545 }
546
547
548 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
549 // throw an incompatible class change exception
550 // If inner_is_member, require the inner to be a member of the outer.
551 // If !inner_is_member, require the inner to be anonymous (a non-member).
552 // Caller is responsible for figuring out in advance which case must be true.
553 void Reflection::check_for_inner_class(instanceKlassHandle outer, instanceKlassHandle inner,
554 bool inner_is_member, TRAPS) {
555 InnerClassesIterator iter(outer);
556 constantPoolHandle cp (THREAD, outer->constants());
557 for (; !iter.done(); iter.next()) {
558 int ioff = iter.inner_class_info_index();
559 int ooff = iter.outer_class_info_index();
560
561 if (inner_is_member && ioff != 0 && ooff != 0) {
562 Klass* o = cp->klass_at(ooff, CHECK);
563 if (o == outer()) {
564 Klass* i = cp->klass_at(ioff, CHECK);
565 if (i == inner()) {
566 return;
567 }
568 }
569 }
570 if (!inner_is_member && ioff != 0 && ooff == 0 &&
571 cp->klass_name_at_matches(inner, ioff)) {
572 Klass* i = cp->klass_at(ioff, CHECK);
573 if (i == inner()) {
574 return;
575 }
576 }
577 }
578
579 // 'inner' not declared as an inner klass in outer
580 ResourceMark rm(THREAD);
581 Exceptions::fthrow(
582 THREAD_AND_LOCATION,
583 vmSymbols::java_lang_IncompatibleClassChangeError(),
584 "%s and %s disagree on InnerClasses attribute",
585 outer->external_name(),
586 inner->external_name()
587 );
588 }
589
590 // Utility method converting a single SignatureStream element into java.lang.Class instance
591
592 oop get_mirror_from_signature(methodHandle method, SignatureStream* ss, TRAPS) {
593 switch (ss->type()) {
594 default:
595 assert(ss->type() != T_VOID || ss->at_return_type(), "T_VOID should only appear as return type");
596 return java_lang_Class::primitive_mirror(ss->type());
597 case T_OBJECT:
598 case T_ARRAY:
599 Symbol* name = ss->as_symbol(CHECK_NULL);
600 oop loader = method->method_holder()->class_loader();
601 oop protection_domain = method->method_holder()->protection_domain();
602 Klass* k = SystemDictionary::resolve_or_fail(
603 name,
604 Handle(THREAD, loader),
605 Handle(THREAD, protection_domain),
606 true, CHECK_NULL);
607 if (TraceClassResolution) {
608 trace_class_resolution(k);
609 }
610 return k->java_mirror();
611 };
612 }
613
614
615 objArrayHandle Reflection::get_parameter_types(const methodHandle& method, int parameter_count, oop* return_type, TRAPS) {
616 // Allocate array holding parameter types (java.lang.Class instances)
617 objArrayOop m = oopFactory::new_objArray(SystemDictionary::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
618 objArrayHandle mirrors (THREAD, m);
619 int index = 0;
620 // Collect parameter types
621 ResourceMark rm(THREAD);
622 Symbol* signature = method->signature();
623 SignatureStream ss(signature);
624 while (!ss.at_return_type()) {
625 oop mirror = get_mirror_from_signature(method, &ss, CHECK_(objArrayHandle()));
626 mirrors->obj_at_put(index++, mirror);
627 ss.next();
628 }
629 assert(index == parameter_count, "invalid parameter count");
630 if (return_type != NULL) {
631 // Collect return type as well
632 assert(ss.at_return_type(), "return type should be present");
633 *return_type = get_mirror_from_signature(method, &ss, CHECK_(objArrayHandle()));
634 }
635 return mirrors;
636 }
637
638 objArrayHandle Reflection::get_exception_types(const methodHandle& method, TRAPS) {
639 return method->resolved_checked_exceptions(THREAD);
640 }
641
642
643 Handle Reflection::new_type(Symbol* signature, KlassHandle k, TRAPS) {
644 // Basic types
645 BasicType type = vmSymbols::signature_type(signature);
646 if (type != T_OBJECT) {
647 return Handle(THREAD, Universe::java_mirror(type));
648 }
649
650 Klass* result = SystemDictionary::resolve_or_fail(signature,
651 Handle(THREAD, k->class_loader()),
652 Handle(THREAD, k->protection_domain()),
653 true, CHECK_(Handle()));
654
655 if (TraceClassResolution) {
656 trace_class_resolution(result);
657 }
658
659 oop nt = result->java_mirror();
660 return Handle(THREAD, nt);
661 }
662
663
664 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
665 // Allow sun.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
666 assert(!method()->is_initializer() ||
667 (for_constant_pool_access && method()->is_static()),
668 "should call new_constructor instead");
669 instanceKlassHandle holder (THREAD, method->method_holder());
670 int slot = method->method_idnum();
671
672 Symbol* signature = method->signature();
673 int parameter_count = ArgumentCount(signature).size();
674 oop return_type_oop = NULL;
675 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
676 if (parameter_types.is_null() || return_type_oop == NULL) return NULL;
677
678 Handle return_type(THREAD, return_type_oop);
679
680 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
681
682 if (exception_types.is_null()) return NULL;
683
684 Symbol* method_name = method->name();
685 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
686 Handle name = Handle(THREAD, name_oop);
687 if (name == NULL) return NULL;
688
689 int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
690
691 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
692
693 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
694 java_lang_reflect_Method::set_slot(mh(), slot);
695 java_lang_reflect_Method::set_name(mh(), name());
696 java_lang_reflect_Method::set_return_type(mh(), return_type());
697 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
698 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
699 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
700 java_lang_reflect_Method::set_override(mh(), false);
701 if (java_lang_reflect_Method::has_signature_field() &&
702 method->generic_signature() != NULL) {
703 Symbol* gs = method->generic_signature();
704 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
705 java_lang_reflect_Method::set_signature(mh(), sig());
706 }
707 if (java_lang_reflect_Method::has_annotations_field()) {
708 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
709 java_lang_reflect_Method::set_annotations(mh(), an_oop);
710 }
711 if (java_lang_reflect_Method::has_parameter_annotations_field()) {
712 typeArrayOop an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
713 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
714 }
715 if (java_lang_reflect_Method::has_annotation_default_field()) {
716 typeArrayOop an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
717 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
718 }
719 if (java_lang_reflect_Method::has_type_annotations_field()) {
720 typeArrayOop an_oop = Annotations::make_java_array(method->type_annotations(), CHECK_NULL);
721 java_lang_reflect_Method::set_type_annotations(mh(), an_oop);
722 }
723 return mh();
724 }
725
726
727 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
728 assert(method()->is_initializer(), "should call new_method instead");
729
730 instanceKlassHandle holder (THREAD, method->method_holder());
731 int slot = method->method_idnum();
732
733 Symbol* signature = method->signature();
734 int parameter_count = ArgumentCount(signature).size();
735 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, NULL, CHECK_NULL);
736 if (parameter_types.is_null()) return NULL;
737
738 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
739 if (exception_types.is_null()) return NULL;
740
741 int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
742
743 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
744
745 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
746 java_lang_reflect_Constructor::set_slot(ch(), slot);
747 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
748 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
749 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
750 java_lang_reflect_Constructor::set_override(ch(), false);
751 if (java_lang_reflect_Constructor::has_signature_field() &&
752 method->generic_signature() != NULL) {
753 Symbol* gs = method->generic_signature();
754 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
755 java_lang_reflect_Constructor::set_signature(ch(), sig());
756 }
757 if (java_lang_reflect_Constructor::has_annotations_field()) {
758 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
759 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
760 }
761 if (java_lang_reflect_Constructor::has_parameter_annotations_field()) {
762 typeArrayOop an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
763 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
764 }
765 if (java_lang_reflect_Constructor::has_type_annotations_field()) {
766 typeArrayOop an_oop = Annotations::make_java_array(method->type_annotations(), CHECK_NULL);
767 java_lang_reflect_Constructor::set_type_annotations(ch(), an_oop);
768 }
769 return ch();
770 }
771
772
773 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
774 Symbol* field_name = fd->name();
775 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
776 Handle name = Handle(THREAD, name_oop);
777 Symbol* signature = fd->signature();
778 instanceKlassHandle holder (THREAD, fd->field_holder());
779 Handle type = new_type(signature, holder, CHECK_NULL);
780 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
781
782 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
783 java_lang_reflect_Field::set_slot(rh(), fd->index());
784 java_lang_reflect_Field::set_name(rh(), name());
785 java_lang_reflect_Field::set_type(rh(), type());
786 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
787 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
788 java_lang_reflect_Field::set_override(rh(), false);
789 if (java_lang_reflect_Field::has_signature_field() &&
790 fd->has_generic_signature()) {
791 Symbol* gs = fd->generic_signature();
792 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
793 java_lang_reflect_Field::set_signature(rh(), sig());
794 }
795 if (java_lang_reflect_Field::has_annotations_field()) {
796 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
797 java_lang_reflect_Field::set_annotations(rh(), an_oop);
798 }
799 if (java_lang_reflect_Field::has_type_annotations_field()) {
800 typeArrayOop an_oop = Annotations::make_java_array(fd->type_annotations(), CHECK_NULL);
801 java_lang_reflect_Field::set_type_annotations(rh(), an_oop);
802 }
803 return rh();
804 }
805
806 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
807 int flags, TRAPS) {
808
809 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
810
811 if(NULL != sym) {
812 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
813 java_lang_reflect_Parameter::set_name(rh(), name());
814 } else {
815 java_lang_reflect_Parameter::set_name(rh(), NULL);
816 }
817
818 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
819 java_lang_reflect_Parameter::set_executable(rh(), method());
820 java_lang_reflect_Parameter::set_index(rh(), index);
821 return rh();
822 }
823
824
825 methodHandle Reflection::resolve_interface_call(instanceKlassHandle klass, const methodHandle& method,
826 KlassHandle recv_klass, Handle receiver, TRAPS) {
827 assert(!method.is_null() , "method should not be null");
828
829 CallInfo info;
830 Symbol* signature = method->signature();
831 Symbol* name = method->name();
832 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
833 LinkInfo(klass, name, signature),
834 true,
835 CHECK_(methodHandle()));
836 return info.selected_method();
837 }
838
839
840 oop Reflection::invoke(instanceKlassHandle klass, const methodHandle& reflected_method,
841 Handle receiver, bool override, objArrayHandle ptypes,
842 BasicType rtype, objArrayHandle args, bool is_method_invoke, TRAPS) {
843 ResourceMark rm(THREAD);
844
845 methodHandle method; // actual method to invoke
846 KlassHandle target_klass; // target klass, receiver's klass for non-static
847
848 // Ensure klass is initialized
849 klass->initialize(CHECK_NULL);
850
851 bool is_static = reflected_method->is_static();
852 if (is_static) {
853 // ignore receiver argument
854 method = reflected_method;
855 target_klass = klass;
856 } else {
857 // check for null receiver
858 if (receiver.is_null()) {
859 THROW_0(vmSymbols::java_lang_NullPointerException());
860 }
861 // Check class of receiver against class declaring method
862 if (!receiver->is_a(klass())) {
863 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
864 }
865 // target klass is receiver's klass
866 target_klass = KlassHandle(THREAD, receiver->klass());
867 // no need to resolve if method is private or <init>
868 if (reflected_method->is_private() || reflected_method->name() == vmSymbols::object_initializer_name()) {
869 method = reflected_method;
870 } else {
871 // resolve based on the receiver
872 if (reflected_method->method_holder()->is_interface()) {
873 // resolve interface call
874 //
875 // Match resolution errors with those thrown due to reflection inlining
876 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
877 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
878 if (HAS_PENDING_EXCEPTION) {
879 // Method resolution threw an exception; wrap it in an InvocationTargetException
880 oop resolution_exception = PENDING_EXCEPTION;
881 CLEAR_PENDING_EXCEPTION;
882 // JVMTI has already reported the pending exception
883 // JVMTI internal flag reset is needed in order to report InvocationTargetException
884 if (THREAD->is_Java_thread()) {
885 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
886 }
887 JavaCallArguments args(Handle(THREAD, resolution_exception));
888 THROW_ARG_0(vmSymbols::java_lang_reflect_InvocationTargetException(),
889 vmSymbols::throwable_void_signature(),
890 &args);
891 }
892 } else {
893 // if the method can be overridden, we resolve using the vtable index.
894 assert(!reflected_method->has_itable_index(), "");
895 int index = reflected_method->vtable_index();
896 method = reflected_method;
897 if (index != Method::nonvirtual_vtable_index) {
898 // target_klass might be an arrayKlassOop but all vtables start at
899 // the same place. The cast is to avoid virtual call and assertion.
900 InstanceKlass* inst = (InstanceKlass*)target_klass();
901 method = methodHandle(THREAD, inst->method_at_vtable(index));
902 }
903 if (!method.is_null()) {
904 // Check for abstract methods as well
905 if (method->is_abstract()) {
906 // new default: 6531596
907 ResourceMark rm(THREAD);
908 Handle h_origexception = Exceptions::new_exception(THREAD,
909 vmSymbols::java_lang_AbstractMethodError(),
910 Method::name_and_sig_as_C_string(target_klass(),
911 method->name(),
912 method->signature()));
913 JavaCallArguments args(h_origexception);
914 THROW_ARG_0(vmSymbols::java_lang_reflect_InvocationTargetException(),
915 vmSymbols::throwable_void_signature(),
916 &args);
917 }
918 }
919 }
920 }
921 }
922
923 // I believe this is a ShouldNotGetHere case which requires
924 // an internal vtable bug. If you ever get this please let Karen know.
925 if (method.is_null()) {
926 ResourceMark rm(THREAD);
927 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(),
928 Method::name_and_sig_as_C_string(klass(),
929 reflected_method->name(),
930 reflected_method->signature()));
931 }
932
933 assert(ptypes->is_objArray(), "just checking");
934 int args_len = args.is_null() ? 0 : args->length();
935 // Check number of arguments
936 if (ptypes->length() != args_len) {
937 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "wrong number of arguments");
938 }
939
940 // Create object to contain parameters for the JavaCall
941 JavaCallArguments java_args(method->size_of_parameters());
942
943 if (!is_static) {
944 java_args.push_oop(receiver);
945 }
946
947 for (int i = 0; i < args_len; i++) {
948 oop type_mirror = ptypes->obj_at(i);
949 oop arg = args->obj_at(i);
950 if (java_lang_Class::is_primitive(type_mirror)) {
951 jvalue value;
952 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror, CHECK_NULL);
953 BasicType atype = unbox_for_primitive(arg, &value, CHECK_NULL);
954 if (ptype != atype) {
955 widen(&value, atype, ptype, CHECK_NULL);
956 }
957 switch (ptype) {
958 case T_BOOLEAN: java_args.push_int(value.z); break;
959 case T_CHAR: java_args.push_int(value.c); break;
960 case T_BYTE: java_args.push_int(value.b); break;
961 case T_SHORT: java_args.push_int(value.s); break;
962 case T_INT: java_args.push_int(value.i); break;
963 case T_LONG: java_args.push_long(value.j); break;
964 case T_FLOAT: java_args.push_float(value.f); break;
965 case T_DOUBLE: java_args.push_double(value.d); break;
966 default:
967 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
968 }
969 } else {
970 if (arg != NULL) {
971 Klass* k = java_lang_Class::as_Klass(type_mirror);
972 if (!arg->is_a(k)) {
973 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
974 }
975 }
976 Handle arg_handle(THREAD, arg); // Create handle for argument
977 java_args.push_oop(arg_handle); // Push handle
978 }
979 }
980
981 assert(java_args.size_of_parameters() == method->size_of_parameters(), "just checking");
982
983 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
984 // oop (i.e., NOT as an handle)
985 JavaValue result(rtype);
986 JavaCalls::call(&result, method, &java_args, THREAD);
987
988 if (HAS_PENDING_EXCEPTION) {
989 // Method threw an exception; wrap it in an InvocationTargetException
990 oop target_exception = PENDING_EXCEPTION;
991 CLEAR_PENDING_EXCEPTION;
992 // JVMTI has already reported the pending exception
993 // JVMTI internal flag reset is needed in order to report InvocationTargetException
994 if (THREAD->is_Java_thread()) {
995 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
996 }
997
998 JavaCallArguments args(Handle(THREAD, target_exception));
999 THROW_ARG_0(vmSymbols::java_lang_reflect_InvocationTargetException(),
1000 vmSymbols::throwable_void_signature(),
1001 &args);
1002 } else {
1003 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1004 narrow((jvalue*) result.get_value_addr(), rtype, CHECK_NULL);
1005 }
1006 return box((jvalue*) result.get_value_addr(), rtype, THREAD);
1007 }
1008 }
1009
1010
1011 void Reflection::narrow(jvalue* value, BasicType narrow_type, TRAPS) {
1012 switch (narrow_type) {
1013 case T_BOOLEAN:
1014 value->z = (jboolean) value->i;
1015 return;
1016 case T_BYTE:
1017 value->b = (jbyte) value->i;
1018 return;
1019 case T_CHAR:
1020 value->c = (jchar) value->i;
1021 return;
1022 case T_SHORT:
1023 value->s = (jshort) value->i;
1024 return;
1025 default:
1026 break; // fail
1027 }
1028 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1029 }
1030
1031
1032 BasicType Reflection::basic_type_mirror_to_basic_type(oop basic_type_mirror, TRAPS) {
1033 assert(java_lang_Class::is_primitive(basic_type_mirror), "just checking");
1034 return java_lang_Class::primitive_type(basic_type_mirror);
1035 }
1036
1037 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1038 // of java.lang.reflect.Constructor
1039
1040 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1041 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1042 int slot = java_lang_reflect_Method::slot(method_mirror);
1043 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1044 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1045
1046 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1047 BasicType rtype;
1048 if (java_lang_Class::is_primitive(return_type_mirror)) {
1049 rtype = basic_type_mirror_to_basic_type(return_type_mirror, CHECK_NULL);
1050 } else {
1051 rtype = T_OBJECT;
1052 }
1053
1054 instanceKlassHandle klass(THREAD, java_lang_Class::as_Klass(mirror));
1055 Method* m = klass->method_with_idnum(slot);
1056 if (m == NULL) {
1057 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "invoke");
1058 }
1059 methodHandle method(THREAD, m);
1060
1061 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1062 }
1063
1064
1065 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1066 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1067 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1068 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1069 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1070
1071 instanceKlassHandle klass(THREAD, java_lang_Class::as_Klass(mirror));
1072 Method* m = klass->method_with_idnum(slot);
1073 if (m == NULL) {
1074 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "invoke");
1075 }
1076 methodHandle method(THREAD, m);
1077 assert(method->name() == vmSymbols::object_initializer_name(), "invalid constructor");
1078
1079 // Make sure klass gets initialize
1080 klass->initialize(CHECK_NULL);
1081
1082 // Create new instance (the receiver)
1083 klass->check_valid_for_instantiation(false, CHECK_NULL);
1084 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1085
1086 // Ignore result from call and return receiver
1087 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1088 return receiver();
1089 }