1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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 "cds/cdsConfig.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/moduleEntry.hpp"
28 #include "classfile/packageEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/verifier.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "jvm.h"
35 #include "logging/log.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.hpp"
39 #include "oops/instanceKlass.inline.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/objArrayOop.inline.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/typeArrayOop.inline.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/fieldDescriptor.inline.hpp"
47 #include "runtime/handles.inline.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/javaThread.hpp"
50 #include "runtime/reflection.hpp"
51 #include "runtime/signature.hpp"
52 #include "runtime/vframe.inline.hpp"
53 #include "utilities/formatBuffer.hpp"
54
55 static void trace_class_resolution(oop mirror) {
56 if (mirror == nullptr || java_lang_Class::is_primitive(mirror)) {
57 return;
58 }
59 Klass* to_class = java_lang_Class::as_Klass(mirror);
60 ResourceMark rm;
61 int line_number = -1;
62 const char * source_file = nullptr;
63 Klass* caller = nullptr;
64 JavaThread* jthread = JavaThread::current();
65 if (jthread->has_last_Java_frame()) {
66 vframeStream vfst(jthread);
67 // skip over any frames belonging to java.lang.Class
68 while (!vfst.at_end() &&
69 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class()) {
70 vfst.next();
71 }
72 if (!vfst.at_end()) {
73 // this frame is a likely suspect
74 caller = vfst.method()->method_holder();
75 line_number = vfst.method()->line_number_from_bci(vfst.bci());
76 Symbol* s = vfst.method()->method_holder()->source_file_name();
77 if (s != nullptr) {
78 source_file = s->as_C_string();
79 }
80 }
81 }
82 if (caller != nullptr) {
83 const char * from = caller->external_name();
84 const char * to = to_class->external_name();
85 // print in a single call to reduce interleaving between threads
86 if (source_file != nullptr) {
87 log_debug(class, resolve)("%s %s %s:%d (reflection)", from, to, source_file, line_number);
88 } else {
89 log_debug(class, resolve)("%s %s (reflection)", from, to);
90 }
91 }
92 }
93
94
95 oop Reflection::box(jvalue* value, BasicType type, TRAPS) {
96 if (type == T_VOID) {
97 return nullptr;
98 }
99 if (is_reference_type(type)) {
100 // regular objects are not boxed
101 return cast_to_oop(value->l);
102 }
103 oop result = java_lang_boxing_object::create(type, value, CHECK_NULL);
104 if (result == nullptr) {
105 THROW_(vmSymbols::java_lang_IllegalArgumentException(), result);
106 }
107 return result;
108 }
109
110
111 BasicType Reflection::unbox_for_primitive(oop box, jvalue* value, TRAPS) {
112 if (box == nullptr) {
113 THROW_(vmSymbols::java_lang_IllegalArgumentException(), T_ILLEGAL);
114 }
115 return java_lang_boxing_object::get_value(box, value);
116 }
117
118 BasicType Reflection::unbox_for_regular_object(oop box, jvalue* value) {
119 // Note: box is really the unboxed oop. It might even be a Short, etc.!
120 value->l = cast_from_oop<jobject>(box);
121 return T_OBJECT;
122 }
123
124
125 void Reflection::widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS) {
126 assert(wide_type != current_type, "widen should not be called with identical types");
127 switch (wide_type) {
128 case T_BOOLEAN:
129 case T_BYTE:
130 case T_CHAR:
131 break; // fail
132 case T_SHORT:
133 switch (current_type) {
134 case T_BYTE:
135 value->s = (jshort) value->b;
136 return;
137 default:
138 break;
139 }
140 break; // fail
141 case T_INT:
142 switch (current_type) {
143 case T_BYTE:
144 value->i = (jint) value->b;
145 return;
146 case T_CHAR:
147 value->i = (jint) value->c;
148 return;
149 case T_SHORT:
150 value->i = (jint) value->s;
151 return;
152 default:
153 break;
154 }
155 break; // fail
156 case T_LONG:
157 switch (current_type) {
158 case T_BYTE:
159 value->j = (jlong) value->b;
160 return;
161 case T_CHAR:
162 value->j = (jlong) value->c;
163 return;
164 case T_SHORT:
165 value->j = (jlong) value->s;
166 return;
167 case T_INT:
168 value->j = (jlong) value->i;
169 return;
170 default:
171 break;
172 }
173 break; // fail
174 case T_FLOAT:
175 switch (current_type) {
176 case T_BYTE:
177 value->f = (jfloat) value->b;
178 return;
179 case T_CHAR:
180 value->f = (jfloat) value->c;
181 return;
182 case T_SHORT:
183 value->f = (jfloat) value->s;
184 return;
185 case T_INT:
186 value->f = (jfloat) value->i;
187 return;
188 case T_LONG:
189 value->f = (jfloat) value->j;
190 return;
191 default:
192 break;
193 }
194 break; // fail
195 case T_DOUBLE:
196 switch (current_type) {
197 case T_BYTE:
198 value->d = (jdouble) value->b;
199 return;
200 case T_CHAR:
201 value->d = (jdouble) value->c;
202 return;
203 case T_SHORT:
204 value->d = (jdouble) value->s;
205 return;
206 case T_INT:
207 value->d = (jdouble) value->i;
208 return;
209 case T_FLOAT:
210 value->d = (jdouble) value->f;
211 return;
212 case T_LONG:
213 value->d = (jdouble) value->j;
214 return;
215 default:
216 break;
217 }
218 break; // fail
219 default:
220 break; // fail
221 }
222 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
223 }
224
225
226 BasicType Reflection::array_get(jvalue* value, arrayOop a, int index, TRAPS) {
227 if (!a->is_within_bounds(index)) {
228 THROW_(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), T_ILLEGAL);
229 }
230 if (a->is_objArray()) {
231 value->l = cast_from_oop<jobject>(objArrayOop(a)->obj_at(index));
232 return T_OBJECT;
233 } else {
234 assert(a->is_typeArray(), "just checking");
235 BasicType type = TypeArrayKlass::cast(a->klass())->element_type();
236 switch (type) {
237 case T_BOOLEAN:
238 value->z = typeArrayOop(a)->bool_at(index);
239 break;
240 case T_CHAR:
241 value->c = typeArrayOop(a)->char_at(index);
242 break;
243 case T_FLOAT:
244 value->f = typeArrayOop(a)->float_at(index);
245 break;
246 case T_DOUBLE:
247 value->d = typeArrayOop(a)->double_at(index);
248 break;
249 case T_BYTE:
250 value->b = typeArrayOop(a)->byte_at(index);
251 break;
252 case T_SHORT:
253 value->s = typeArrayOop(a)->short_at(index);
254 break;
255 case T_INT:
256 value->i = typeArrayOop(a)->int_at(index);
257 break;
258 case T_LONG:
259 value->j = typeArrayOop(a)->long_at(index);
260 break;
261 default:
262 return T_ILLEGAL;
263 }
264 return type;
265 }
266 }
267
268
269 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) {
270 if (!a->is_within_bounds(index)) {
271 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
272 }
273 if (value_type == T_OBJECT) {
274 assert(a->is_objArray(), "just checking");
275 oop obj = cast_to_oop(value->l);
276 if (obj != nullptr) {
277 Klass* element_klass = ObjArrayKlass::cast(a->klass())->element_klass();
278 if (!obj->is_a(element_klass)) {
279 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array element type mismatch");
280 }
281 }
282 objArrayOop(a)->obj_at_put(index, obj);
283 } else {
284 assert(a->is_typeArray(), "just checking");
285 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
286 if (array_type != value_type) {
287 // The widen operation can potentially throw an exception, but cannot block,
288 // so typeArrayOop a is safe if the call succeeds.
289 widen(value, value_type, array_type, CHECK);
290 }
291 switch (array_type) {
292 case T_BOOLEAN:
293 typeArrayOop(a)->bool_at_put(index, value->z);
294 break;
295 case T_CHAR:
296 typeArrayOop(a)->char_at_put(index, value->c);
297 break;
298 case T_FLOAT:
299 typeArrayOop(a)->float_at_put(index, value->f);
300 break;
301 case T_DOUBLE:
302 typeArrayOop(a)->double_at_put(index, value->d);
303 break;
304 case T_BYTE:
305 typeArrayOop(a)->byte_at_put(index, value->b);
306 break;
307 case T_SHORT:
308 typeArrayOop(a)->short_at_put(index, value->s);
309 break;
310 case T_INT:
311 typeArrayOop(a)->int_at_put(index, value->i);
312 break;
313 case T_LONG:
314 typeArrayOop(a)->long_at_put(index, value->j);
315 break;
316 default:
317 THROW(vmSymbols::java_lang_IllegalArgumentException());
318 }
319 }
320 }
321
322
323 // Conversion
324 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
325 assert(java_lang_Class::is_primitive(basic_type_mirror),
326 "just checking");
327 return java_lang_Class::primitive_type(basic_type_mirror);
328 }
329
330 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
331 BasicType type = basic_type_mirror_to_basic_type(basic_type_mirror);
332 if (type == T_VOID) {
333 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
334 }
335 else {
336 return Universe::typeArrayKlass(type);
337 }
338 }
339
340 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
341 if (element_mirror == nullptr) {
342 THROW_NULL(vmSymbols::java_lang_NullPointerException());
343 }
344 if (length < 0) {
345 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
346 }
347 if (java_lang_Class::is_primitive(element_mirror)) {
348 BasicType type = basic_type_mirror_to_basic_type(element_mirror);
349 if (type == T_VOID) {
350 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
351 }
352 return oopFactory::new_typeArray(type, length, CHECK_NULL);
353 } else {
354 Klass* k = java_lang_Class::as_Klass(element_mirror);
355 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
356 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
357 }
358 return oopFactory::new_objArray(k, length, THREAD);
359 }
360 }
361
362
363 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
364 assert(dim_array->is_typeArray(), "just checking");
365 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
366
367 if (element_mirror == nullptr) {
368 THROW_NULL(vmSymbols::java_lang_NullPointerException());
369 }
370
371 int len = dim_array->length();
372 if (len <= 0 || len > MAX_DIM) {
373 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
374 }
375
376 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
377 for (int i = 0; i < len; i++) {
378 int d = dim_array->int_at(i);
379 if (d < 0) {
380 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
381 }
382 dimensions[i] = d;
383 }
384
385 Klass* klass;
386 int dim = len;
387 if (java_lang_Class::is_primitive(element_mirror)) {
388 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
389 } else {
390 klass = java_lang_Class::as_Klass(element_mirror);
391 if (klass->is_array_klass()) {
392 int k_dim = ArrayKlass::cast(klass)->dimension();
393 if (k_dim + len > MAX_DIM) {
394 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
395 }
396 dim += k_dim;
397 }
398 }
399 klass = klass->array_klass(dim, CHECK_NULL);
400 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
401 assert(obj->is_array(), "just checking");
402 return arrayOop(obj);
403 }
404
405
406 static bool can_relax_access_check_for(const Klass* accessor,
407 const Klass* accessee,
408 bool classloader_only) {
409
410 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
411 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
412
413 if (RelaxAccessControlCheck &&
414 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
415 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
416 return classloader_only &&
417 Verifier::relax_access_for(accessor_ik->class_loader()) &&
418 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
419 accessor_ik->class_loader() == accessee_ik->class_loader();
420 }
421
422 return false;
423 }
424
425 /*
426 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
427
428 Callee T in Callee T in package PT,
429 unnamed module runtime module MT
430 ------------------------------------------------------------------------------------------------
431
432 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
433 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
434 unnamed module: YES
435 Else if (MS can read MT (establish readability) &&
436 ((MT exports PT to MS or to all modules) ||
437 (MT is open))): YES
438
439 ------------------------------------------------------------------------------------------------
440 Caller S in unnamed YES Readability exists because unnamed module
441 module UM "reads" all modules
442 if (MT exports PT to UM or to all modules): YES
443
444 ------------------------------------------------------------------------------------------------
445
446 Note: a loose module is a module that can read all current and future unnamed modules.
447 */
448 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
449 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
450
451 // Verify that current_class can access new_class. If the classloader_only
452 // flag is set, we automatically allow any accesses in which current_class
453 // doesn't have a classloader.
454 if ((current_class == nullptr) ||
455 (current_class == new_class) ||
456 is_same_class_package(current_class, new_class)) {
457 return ACCESS_OK;
458 }
459
460 // module boundaries
461 if (new_class->is_public()) {
462 // Find the module entry for current_class, the accessor
463 ModuleEntry* module_from = current_class->module();
464 // Find the module entry for new_class, the accessee
465 ModuleEntry* module_to = new_class->module();
466
467 // both in same (possibly unnamed) module
468 if (module_from == module_to) {
469 return ACCESS_OK;
470 }
471
472 // Acceptable access to a type in an unnamed module. Note that since
473 // unnamed modules can read all unnamed modules, this also handles the
474 // case where module_from is also unnamed but in a different class loader.
475 if (!module_to->is_named() &&
476 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
477 return ACCESS_OK;
478 }
479
480 // Establish readability, check if module_from is allowed to read module_to.
481 if (!module_from->can_read(module_to)) {
482 return MODULE_NOT_READABLE;
483 }
484
485 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
486 if (module_to->is_open()) {
487 return ACCESS_OK;
488 }
489
490 PackageEntry* package_to = new_class->package();
491 assert(package_to != nullptr, "can not obtain new_class' package");
492
493 {
494 MutexLocker m1(Module_lock);
495
496 // Once readability is established, if module_to exports T unqualifiedly,
497 // (to all modules), than whether module_from is in the unnamed module
498 // or not does not matter, access is allowed.
499 if (package_to->is_unqual_exported()) {
500 return ACCESS_OK;
501 }
502
503 // Access is allowed if both 1 & 2 hold:
504 // 1. Readability, module_from can read module_to (established above).
505 // 2. Either module_to exports T to module_from qualifiedly.
506 // or
507 // module_to exports T to all unnamed modules and module_from is unnamed.
508 // or
509 // module_to exports T unqualifiedly to all modules (checked above).
510 if (!package_to->is_qexported_to(module_from)) {
511 return TYPE_NOT_EXPORTED;
512 }
513 }
514 return ACCESS_OK;
515 }
516
517 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
518 return ACCESS_OK;
519 }
520 return OTHER_PROBLEM;
521 }
522
523 // Return an error message specific to the specified Klass*'s and result.
524 // This function must be called from within a block containing a ResourceMark.
525 char* Reflection::verify_class_access_msg(const Klass* current_class,
526 const InstanceKlass* new_class,
527 const VerifyClassAccessResults result) {
528 assert(result != ACCESS_OK, "must be failure result");
529 char * msg = nullptr;
530 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
531 // Find the module entry for current_class, the accessor
532 ModuleEntry* module_from = current_class->module();
533 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
534 const char * current_class_name = current_class->external_name();
535
536 // Find the module entry for new_class, the accessee
537 ModuleEntry* module_to = nullptr;
538 module_to = new_class->module();
539 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
540 const char * new_class_name = new_class->external_name();
541
542 if (result == MODULE_NOT_READABLE) {
543 assert(module_from->is_named(), "Unnamed modules can read all modules");
544 if (module_to->is_named()) {
545 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
546 strlen(new_class_name) + 2*strlen(module_to_name);
547 msg = NEW_RESOURCE_ARRAY(char, len);
548 jio_snprintf(msg, len,
549 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
550 current_class_name, module_from_name, new_class_name,
551 module_to_name, module_from_name, module_to_name);
552 } else {
553 oop module_oop = module_to->module_oop();
554 assert(module_oop != nullptr, "should have been initialized");
555 intptr_t identity_hash = module_oop->identity_hash();
556 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
557 strlen(new_class_name) + 2*sizeof(uintx);
558 msg = NEW_RESOURCE_ARRAY(char, len);
559 jio_snprintf(msg, len,
560 "class %s (in module %s) cannot access class %s (in unnamed module @0x%zx) because module %s does not read unnamed module @0x%zx",
561 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
562 module_from_name, uintx(identity_hash));
563 }
564
565 } else if (result == TYPE_NOT_EXPORTED) {
566 assert(new_class->package() != nullptr,
567 "Unnamed packages are always exported");
568 const char * package_name =
569 new_class->package()->name()->as_klass_external_name();
570 assert(module_to->is_named(), "Unnamed modules export all packages");
571 if (module_from->is_named()) {
572 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
573 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
574 msg = NEW_RESOURCE_ARRAY(char, len);
575 jio_snprintf(msg, len,
576 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
577 current_class_name, module_from_name, new_class_name,
578 module_to_name, module_to_name, package_name, module_from_name);
579 } else {
580 oop module_oop = module_from->module_oop();
581 assert(module_oop != nullptr, "should have been initialized");
582 intptr_t identity_hash = module_oop->identity_hash();
583 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
584 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
585 msg = NEW_RESOURCE_ARRAY(char, len);
586 jio_snprintf(msg, len,
587 "class %s (in unnamed module @0x%zx) cannot access class %s (in module %s) because module %s does not export %s to unnamed module @0x%zx",
588 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
589 module_to_name, package_name, uintx(identity_hash));
590 }
591 } else {
592 ShouldNotReachHere();
593 }
594 } // result != OTHER_PROBLEM...
595 return msg;
596 }
597
598 bool Reflection::verify_member_access(const Klass* current_class,
599 const Klass* resolved_class,
600 const Klass* member_class,
601 AccessFlags access,
602 bool classloader_only,
603 bool protected_restriction,
604 TRAPS) {
605 // Verify that current_class can access a member of member_class, where that
606 // field's access bits are "access". We assume that we've already verified
607 // that current_class can access member_class.
608 //
609 // If the classloader_only flag is set, we automatically allow any accesses
610 // in which current_class doesn't have a classloader.
611 //
612 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
613 // need this distinction (e.g. if all we have is the runtime type, or during
614 // class file parsing when we only care about the static type); in that case
615 // callers should ensure that resolved_class == member_class.
616 //
617 if ((current_class == nullptr) ||
618 (current_class == member_class) ||
619 access.is_public()) {
620 return true;
621 }
622
623 if (current_class == member_class) {
624 return true;
625 }
626
627 if (access.is_protected()) {
628 if (!protected_restriction) {
629 // See if current_class (or outermost host class) is a subclass of member_class
630 // An interface may not access protected members of j.l.Object
631 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
632 if (access.is_static() || // static fields are ok, see 6622385
633 current_class == resolved_class ||
634 member_class == resolved_class ||
635 current_class->is_subclass_of(resolved_class) ||
636 resolved_class->is_subclass_of(current_class)) {
637 return true;
638 }
639 }
640 }
641 }
642
643 // package access
644 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
645 return true;
646 }
647
648 // private access between different classes needs a nestmate check.
649 if (access.is_private()) {
650 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
651 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
652 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
653 // Nestmate access checks may require resolution and validation of the nest-host.
654 // It is up to the caller to check for pending exceptions and handle appropriately.
655 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
656 if (access) {
657 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
658 return true;
659 }
660 }
661 }
662
663 // Check for special relaxations
664 return can_relax_access_check_for(current_class, member_class, classloader_only);
665 }
666
667 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
668 return InstanceKlass::cast(class1)->is_same_class_package(class2);
669 }
670
671 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
672 // throw an incompatible class change exception
673 // If inner_is_member, require the inner to be a member of the outer.
674 // If !inner_is_member, require the inner to be hidden (non-member).
675 // Caller is responsible for figuring out in advance which case must be true.
676 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
677 bool inner_is_member, TRAPS) {
678 InnerClassesIterator iter(outer);
679 constantPoolHandle cp (THREAD, outer->constants());
680 for (; !iter.done(); iter.next()) {
681 int ioff = iter.inner_class_info_index();
682 int ooff = iter.outer_class_info_index();
683
684 if (inner_is_member && ioff != 0 && ooff != 0) {
685 if (cp->klass_name_at_matches(outer, ooff) &&
686 cp->klass_name_at_matches(inner, ioff)) {
687 Klass* o = cp->klass_at(ooff, CHECK);
688 if (o == outer) {
689 Klass* i = cp->klass_at(ioff, CHECK);
690 if (i == inner) {
691 return;
692 }
693 }
694 }
695 }
696
697 if (!inner_is_member && ioff != 0 && ooff == 0 &&
698 cp->klass_name_at_matches(inner, ioff)) {
699 Klass* i = cp->klass_at(ioff, CHECK);
700 if (i == inner) {
701 return;
702 }
703 }
704 }
705
706 // 'inner' not declared as an inner klass in outer
707 ResourceMark rm(THREAD);
708 // Names are all known to be < 64k so we know this formatted message is not excessively large.
709 Exceptions::fthrow(
710 THREAD_AND_LOCATION,
711 vmSymbols::java_lang_IncompatibleClassChangeError(),
712 "%s and %s disagree on InnerClasses attribute",
713 outer->external_name(),
714 inner->external_name()
715 );
716 }
717
718 static objArrayHandle get_parameter_types(const methodHandle& method,
719 int parameter_count,
720 oop* return_type,
721 TRAPS) {
722 objArrayOop m;
723 if (parameter_count == 0) {
724 // Avoid allocating an array for the empty case
725 // Still need to parse the signature for the return type below
726 m = Universe::the_empty_class_array();
727 } else {
728 // Allocate array holding parameter types (java.lang.Class instances)
729 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
730 }
731 objArrayHandle mirrors(THREAD, m);
732 int index = 0;
733 // Collect parameter types
734 ResourceMark rm(THREAD);
735 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) {
736 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle()));
737 if (log_is_enabled(Debug, class, resolve)) {
738 trace_class_resolution(mirror);
739 }
740 if (!ss.at_return_type()) {
741 mirrors->obj_at_put(index++, mirror);
742 } else if (return_type != nullptr) {
743 // Collect return type as well
744 assert(ss.at_return_type(), "return type should be present");
745 *return_type = mirror;
746 }
747 }
748 assert(index == parameter_count, "invalid parameter count");
749 return mirrors;
750 }
751
752 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) {
753 return method->resolved_checked_exceptions(THREAD);
754 }
755
756 static Handle new_type(Symbol* signature, Klass* k, TRAPS) {
757 ResolvingSignatureStream ss(signature, k, false);
758 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH);
759 if (log_is_enabled(Debug, class, resolve)) {
760 trace_class_resolution(nt);
761 }
762 return Handle(THREAD, nt);
763 }
764
765 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
766 // Allow jdk.internal.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
767 assert(!method()->is_object_initializer() &&
768 (for_constant_pool_access || !method()->is_static_initializer()),
769 "Should not be the initializer");
770 InstanceKlass* holder = method->method_holder();
771 int slot = method->method_idnum();
772
773 Symbol* signature = method->signature();
774 int parameter_count = ArgumentCount(signature).size();
775 oop return_type_oop = nullptr;
776 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
777 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
778
779 Handle return_type(THREAD, return_type_oop);
780
781 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
782 assert(!exception_types.is_null(), "cannot return null");
783
784 Symbol* method_name = method->name();
785 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
786 Handle name = Handle(THREAD, name_oop);
787 if (name == nullptr) return nullptr;
788
789 const int modifiers = method->access_flags().as_method_flags();
790
791 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
792
793 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
794 java_lang_reflect_Method::set_slot(mh(), slot);
795 java_lang_reflect_Method::set_name(mh(), name());
796 java_lang_reflect_Method::set_return_type(mh(), return_type());
797 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
798 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
799 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
800 java_lang_reflect_Method::set_override(mh(), false);
801 if (method->generic_signature() != nullptr) {
802 Symbol* gs = method->generic_signature();
803 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
804 java_lang_reflect_Method::set_signature(mh(), sig());
805 }
806 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
807 java_lang_reflect_Method::set_annotations(mh(), an_oop);
808 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
809 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
810 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
811 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
812 return mh();
813 }
814
815
816 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
817 assert(method()->is_object_initializer(), "Should be the initializer");
818
819 InstanceKlass* holder = method->method_holder();
820 int slot = method->method_idnum();
821
822 Symbol* signature = method->signature();
823 int parameter_count = ArgumentCount(signature).size();
824 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
825 if (parameter_types.is_null()) return nullptr;
826
827 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
828 assert(!exception_types.is_null(), "cannot return null");
829
830 const int modifiers = method->access_flags().as_method_flags();
831
832 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
833
834 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
835 java_lang_reflect_Constructor::set_slot(ch(), slot);
836 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
837 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
838 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
839 java_lang_reflect_Constructor::set_override(ch(), false);
840 if (method->generic_signature() != nullptr) {
841 Symbol* gs = method->generic_signature();
842 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
843 java_lang_reflect_Constructor::set_signature(ch(), sig());
844 }
845 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
846 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
847 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
848 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
849 return ch();
850 }
851
852
853 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
854 Symbol* field_name = fd->name();
855 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
856 Handle name = Handle(THREAD, name_oop);
857 Symbol* signature = fd->signature();
858 InstanceKlass* holder = fd->field_holder();
859 Handle type = new_type(signature, holder, CHECK_NULL);
860 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
861
862 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
863 java_lang_reflect_Field::set_slot(rh(), fd->index());
864 java_lang_reflect_Field::set_name(rh(), name());
865 java_lang_reflect_Field::set_type(rh(), type());
866 if (fd->is_trusted_final()) {
867 java_lang_reflect_Field::set_trusted_final(rh());
868 }
869 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
870 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_field_flags());
871 java_lang_reflect_Field::set_override(rh(), false);
872 if (fd->has_generic_signature()) {
873 Symbol* gs = fd->generic_signature();
874 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
875 java_lang_reflect_Field::set_signature(rh(), sig());
876 }
877 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
878 java_lang_reflect_Field::set_annotations(rh(), an_oop);
879 return rh();
880 }
881
882 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
883 int flags, TRAPS) {
884
885 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
886
887 if(nullptr != sym) {
888 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
889 java_lang_reflect_Parameter::set_name(rh(), name());
890 } else {
891 java_lang_reflect_Parameter::set_name(rh(), nullptr);
892 }
893
894 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
895 java_lang_reflect_Parameter::set_executable(rh(), method());
896 java_lang_reflect_Parameter::set_index(rh(), index);
897 return rh();
898 }
899
900
901 static methodHandle resolve_interface_call(InstanceKlass* klass,
902 const methodHandle& method,
903 Klass* recv_klass,
904 Handle receiver,
905 TRAPS) {
906
907 assert(!method.is_null() , "method should not be null");
908
909 CallInfo info;
910 Symbol* signature = method->signature();
911 Symbol* name = method->name();
912 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
913 LinkInfo(klass, name, signature),
914 true,
915 CHECK_(methodHandle()));
916 return methodHandle(THREAD, info.selected_method());
917 }
918
919 // Narrowing of basic types. Used to create correct jvalues for
920 // boolean, byte, char and short return return values from interpreter
921 // which are returned as ints. Throws IllegalArgumentException.
922 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
923 switch (narrow_type) {
924 case T_BOOLEAN:
925 value->z = (jboolean) (value->i & 1);
926 return;
927 case T_BYTE:
928 value->b = (jbyte)value->i;
929 return;
930 case T_CHAR:
931 value->c = (jchar)value->i;
932 return;
933 case T_SHORT:
934 value->s = (jshort)value->i;
935 return;
936 default:
937 break; // fail
938 }
939 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
940 }
941
942
943 // Method call (shared by invoke_method and invoke_constructor)
944 static oop invoke(InstanceKlass* klass,
945 const methodHandle& reflected_method,
946 Handle receiver,
947 bool override,
948 objArrayHandle ptypes,
949 BasicType rtype,
950 objArrayHandle args,
951 bool is_method_invoke,
952 TRAPS) {
953
954 ResourceMark rm(THREAD);
955
956 methodHandle method; // actual method to invoke
957 Klass* target_klass; // target klass, receiver's klass for non-static
958
959 // Ensure klass is initialized
960 klass->initialize(CHECK_NULL);
961
962 bool is_static = reflected_method->is_static();
963 if (is_static) {
964 // ignore receiver argument
965 method = reflected_method;
966 target_klass = klass;
967 } else {
968 // check for null receiver
969 if (receiver.is_null()) {
970 THROW_NULL(vmSymbols::java_lang_NullPointerException());
971 }
972 // Check class of receiver against class declaring method
973 if (!receiver->is_a(klass)) {
974 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
975 }
976 // target klass is receiver's klass
977 target_klass = receiver->klass();
978 // no need to resolve if method is private or <init>
979 if (reflected_method->is_private() || reflected_method->name() == vmSymbols::object_initializer_name()) {
980 method = reflected_method;
981 } else {
982 // resolve based on the receiver
983 if (reflected_method->method_holder()->is_interface()) {
984 // resolve interface call
985 //
986 // Match resolution errors with those thrown due to reflection inlining
987 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
988 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
989 if (HAS_PENDING_EXCEPTION) {
990 // Method resolution threw an exception; wrap it in an InvocationTargetException
991 oop resolution_exception = PENDING_EXCEPTION;
992 CLEAR_PENDING_EXCEPTION;
993 // JVMTI has already reported the pending exception
994 // JVMTI internal flag reset is needed in order to report InvocationTargetException
995 JvmtiExport::clear_detected_exception(THREAD);
996 JavaCallArguments args(Handle(THREAD, resolution_exception));
997 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
998 vmSymbols::throwable_void_signature(),
999 &args);
1000 }
1001 } else {
1002 // if the method can be overridden, we resolve using the vtable index.
1003 assert(!reflected_method->has_itable_index(), "");
1004 int index = reflected_method->vtable_index();
1005 method = reflected_method;
1006 if (index != Method::nonvirtual_vtable_index) {
1007 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1008 }
1009 if (!method.is_null()) {
1010 // Check for abstract methods as well
1011 if (method->is_abstract()) {
1012 // new default: 6531596
1013 ResourceMark rm(THREAD);
1014 stringStream ss;
1015 ss.print("'");
1016 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1017 ss.print("'");
1018 Handle h_origexception = Exceptions::new_exception(THREAD,
1019 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1020 JavaCallArguments args(h_origexception);
1021 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1022 vmSymbols::throwable_void_signature(),
1023 &args);
1024 }
1025 }
1026 }
1027 }
1028 }
1029
1030 // I believe this is a ShouldNotGetHere case which requires
1031 // an internal vtable bug. If you ever get this please let Karen know.
1032 if (method.is_null()) {
1033 ResourceMark rm(THREAD);
1034 stringStream ss;
1035 ss.print("'");
1036 Method::print_external_name(&ss, klass,
1037 reflected_method->name(),
1038 reflected_method->signature());
1039 ss.print("'");
1040 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1041 }
1042
1043 assert(ptypes->is_objArray(), "just checking");
1044 int args_len = args.is_null() ? 0 : args->length();
1045 // Check number of arguments
1046 if (ptypes->length() != args_len) {
1047 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1048 "wrong number of arguments");
1049 }
1050
1051 // Create object to contain parameters for the JavaCall
1052 JavaCallArguments java_args(method->size_of_parameters());
1053
1054 if (!is_static) {
1055 java_args.push_oop(receiver);
1056 }
1057
1058 for (int i = 0; i < args_len; i++) {
1059 oop type_mirror = ptypes->obj_at(i);
1060 oop arg = args->obj_at(i);
1061 if (java_lang_Class::is_primitive(type_mirror)) {
1062 jvalue value;
1063 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1064 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1065 if (ptype != atype) {
1066 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1067 }
1068 switch (ptype) {
1069 case T_BOOLEAN: java_args.push_int(value.z); break;
1070 case T_CHAR: java_args.push_int(value.c); break;
1071 case T_BYTE: java_args.push_int(value.b); break;
1072 case T_SHORT: java_args.push_int(value.s); break;
1073 case T_INT: java_args.push_int(value.i); break;
1074 case T_LONG: java_args.push_long(value.j); break;
1075 case T_FLOAT: java_args.push_float(value.f); break;
1076 case T_DOUBLE: java_args.push_double(value.d); break;
1077 default:
1078 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1079 }
1080 } else {
1081 if (arg != nullptr) {
1082 Klass* k = java_lang_Class::as_Klass(type_mirror);
1083 if (!arg->is_a(k)) {
1084 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1085 "argument type mismatch");
1086 }
1087 }
1088 Handle arg_handle(THREAD, arg); // Create handle for argument
1089 java_args.push_oop(arg_handle); // Push handle
1090 }
1091 }
1092
1093 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1094 "just checking");
1095
1096 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1097 // oop (i.e., NOT as an handle)
1098 JavaValue result(rtype);
1099 JavaCalls::call(&result, method, &java_args, THREAD);
1100
1101 if (HAS_PENDING_EXCEPTION) {
1102 // Method threw an exception; wrap it in an InvocationTargetException
1103 oop target_exception = PENDING_EXCEPTION;
1104 CLEAR_PENDING_EXCEPTION;
1105 // JVMTI has already reported the pending exception
1106 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1107 JvmtiExport::clear_detected_exception(THREAD);
1108
1109 JavaCallArguments args(Handle(THREAD, target_exception));
1110 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1111 vmSymbols::throwable_void_signature(),
1112 &args);
1113 } else {
1114 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1115 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1116 }
1117 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1118 }
1119 }
1120
1121 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1122 // of java.lang.reflect.Constructor
1123
1124 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1125 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1126 int slot = java_lang_reflect_Method::slot(method_mirror);
1127 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1128 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1129
1130 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1131 BasicType rtype;
1132 if (java_lang_Class::is_primitive(return_type_mirror)) {
1133 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1134 } else {
1135 rtype = T_OBJECT;
1136 }
1137
1138 InstanceKlass* klass = java_lang_Class::as_InstanceKlass(mirror);
1139 Method* m = klass->method_with_idnum(slot);
1140 if (m == nullptr) {
1141 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1142 }
1143 methodHandle method(THREAD, m);
1144
1145 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1146 }
1147
1148
1149 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1150 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1151 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1152 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1153 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1154
1155 InstanceKlass* klass = java_lang_Class::as_InstanceKlass(mirror);
1156 Method* m = klass->method_with_idnum(slot);
1157 if (m == nullptr) {
1158 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1159 }
1160 methodHandle method(THREAD, m);
1161 assert(method->name() == vmSymbols::object_initializer_name(), "invalid constructor");
1162
1163 // Make sure klass gets initialize
1164 klass->initialize(CHECK_NULL);
1165
1166 // Create new instance (the receiver)
1167 klass->check_valid_for_instantiation(false, CHECK_NULL);
1168 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1169
1170 // Ignore result from call and return receiver
1171 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1172 return receiver();
1173 }