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 (a->is_objArray()) {
274 if (value_type == T_OBJECT) {
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 }
284 } else {
285 assert(a->is_typeArray(), "just checking");
286 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
287 if (array_type != value_type) {
288 // The widen operation can potentially throw an exception, but cannot block,
289 // so typeArrayOop a is safe if the call succeeds.
290 widen(value, value_type, array_type, CHECK);
291 }
292 switch (array_type) {
293 case T_BOOLEAN:
294 typeArrayOop(a)->bool_at_put(index, value->z);
295 break;
296 case T_CHAR:
297 typeArrayOop(a)->char_at_put(index, value->c);
298 break;
299 case T_FLOAT:
300 typeArrayOop(a)->float_at_put(index, value->f);
301 break;
302 case T_DOUBLE:
303 typeArrayOop(a)->double_at_put(index, value->d);
304 break;
305 case T_BYTE:
306 typeArrayOop(a)->byte_at_put(index, value->b);
307 break;
308 case T_SHORT:
309 typeArrayOop(a)->short_at_put(index, value->s);
310 break;
311 case T_INT:
312 typeArrayOop(a)->int_at_put(index, value->i);
313 break;
314 case T_LONG:
315 typeArrayOop(a)->long_at_put(index, value->j);
316 break;
317 default:
318 THROW(vmSymbols::java_lang_IllegalArgumentException());
319 }
320 }
321 }
322
323
324 // Conversion
325 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
326 assert(java_lang_Class::is_primitive(basic_type_mirror),
327 "just checking");
328 return java_lang_Class::primitive_type(basic_type_mirror);
329 }
330
331 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
332 BasicType type = basic_type_mirror_to_basic_type(basic_type_mirror);
333 if (type == T_VOID) {
334 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
335 }
336 else {
337 return Universe::typeArrayKlass(type);
338 }
339 }
340
341 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
342 if (element_mirror == nullptr) {
343 THROW_NULL(vmSymbols::java_lang_NullPointerException());
344 }
345 if (length < 0) {
346 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
347 }
348 if (java_lang_Class::is_primitive(element_mirror)) {
349 BasicType type = basic_type_mirror_to_basic_type(element_mirror);
350 if (type == T_VOID) {
351 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
352 }
353 return oopFactory::new_typeArray(type, length, CHECK_NULL);
354 } else {
355 Klass* k = java_lang_Class::as_Klass(element_mirror);
356 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
357 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
358 }
359 return oopFactory::new_objArray(k, length, THREAD);
360 }
361 }
362
363
364 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
365 assert(dim_array->is_typeArray(), "just checking");
366 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
367
368 if (element_mirror == nullptr) {
369 THROW_NULL(vmSymbols::java_lang_NullPointerException());
370 }
371
372 int len = dim_array->length();
373 if (len <= 0 || len > MAX_DIM) {
374 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
375 }
376
377 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
378 for (int i = 0; i < len; i++) {
379 int d = dim_array->int_at(i);
380 if (d < 0) {
381 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
382 }
383 dimensions[i] = d;
384 }
385
386 Klass* klass;
387 int dim = len;
388 if (java_lang_Class::is_primitive(element_mirror)) {
389 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
390 } else {
391 klass = java_lang_Class::as_Klass(element_mirror);
392 if (klass->is_array_klass()) {
393 int k_dim = ArrayKlass::cast(klass)->dimension();
394 if (k_dim + len > MAX_DIM) {
395 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
396 }
397 dim += k_dim;
398 }
399 }
400 klass = klass->array_klass(dim, CHECK_NULL);
401 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
402 assert(obj->is_array(), "just checking");
403 return arrayOop(obj);
404 }
405
406
407 static bool can_relax_access_check_for(const Klass* accessor,
408 const Klass* accessee,
409 bool classloader_only) {
410
411 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
412 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
413
414 if (RelaxAccessControlCheck &&
415 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
416 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
417 return classloader_only &&
418 Verifier::relax_access_for(accessor_ik->class_loader()) &&
419 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
420 accessor_ik->class_loader() == accessee_ik->class_loader();
421 }
422
423 return false;
424 }
425
426 /*
427 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
428
429 Callee T in Callee T in package PT,
430 unnamed module runtime module MT
431 ------------------------------------------------------------------------------------------------
432
433 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
434 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
435 unnamed module: YES
436 Else if (MS can read MT (establish readability) &&
437 ((MT exports PT to MS or to all modules) ||
438 (MT is open))): YES
439
440 ------------------------------------------------------------------------------------------------
441 Caller S in unnamed YES Readability exists because unnamed module
442 module UM "reads" all modules
443 if (MT exports PT to UM or to all modules): YES
444
445 ------------------------------------------------------------------------------------------------
446
447 Note: a loose module is a module that can read all current and future unnamed modules.
448 */
449 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
450 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
451
452 // Verify that current_class can access new_class. If the classloader_only
453 // flag is set, we automatically allow any accesses in which current_class
454 // doesn't have a classloader.
455 if ((current_class == nullptr) ||
456 (current_class == new_class) ||
457 is_same_class_package(current_class, new_class)) {
458 return ACCESS_OK;
459 }
460
461 // module boundaries
462 if (new_class->is_public()) {
463 // Find the module entry for current_class, the accessor
464 ModuleEntry* module_from = current_class->module();
465 // Find the module entry for new_class, the accessee
466 ModuleEntry* module_to = new_class->module();
467
468 // both in same (possibly unnamed) module
469 if (module_from == module_to) {
470 return ACCESS_OK;
471 }
472
473 // Acceptable access to a type in an unnamed module. Note that since
474 // unnamed modules can read all unnamed modules, this also handles the
475 // case where module_from is also unnamed but in a different class loader.
476 if (!module_to->is_named() &&
477 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
478 return ACCESS_OK;
479 }
480
481 // Establish readability, check if module_from is allowed to read module_to.
482 if (!module_from->can_read(module_to)) {
483 return MODULE_NOT_READABLE;
484 }
485
486 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
487 if (module_to->is_open()) {
488 return ACCESS_OK;
489 }
490
491 PackageEntry* package_to = new_class->package();
492 assert(package_to != nullptr, "can not obtain new_class' package");
493
494 {
495 MutexLocker m1(Module_lock);
496
497 // Once readability is established, if module_to exports T unqualifiedly,
498 // (to all modules), than whether module_from is in the unnamed module
499 // or not does not matter, access is allowed.
500 if (package_to->is_unqual_exported()) {
501 return ACCESS_OK;
502 }
503
504 // Access is allowed if both 1 & 2 hold:
505 // 1. Readability, module_from can read module_to (established above).
506 // 2. Either module_to exports T to module_from qualifiedly.
507 // or
508 // module_to exports T to all unnamed modules and module_from is unnamed.
509 // or
510 // module_to exports T unqualifiedly to all modules (checked above).
511 if (!package_to->is_qexported_to(module_from)) {
512 return TYPE_NOT_EXPORTED;
513 }
514 }
515 return ACCESS_OK;
516 }
517
518 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
519 return ACCESS_OK;
520 }
521 return OTHER_PROBLEM;
522 }
523
524 // Return an error message specific to the specified Klass*'s and result.
525 // This function must be called from within a block containing a ResourceMark.
526 char* Reflection::verify_class_access_msg(const Klass* current_class,
527 const InstanceKlass* new_class,
528 const VerifyClassAccessResults result) {
529 assert(result != ACCESS_OK, "must be failure result");
530 char * msg = nullptr;
531 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
532 // Find the module entry for current_class, the accessor
533 ModuleEntry* module_from = current_class->module();
534 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
535 const char * current_class_name = current_class->external_name();
536
537 // Find the module entry for new_class, the accessee
538 ModuleEntry* module_to = nullptr;
539 module_to = new_class->module();
540 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
541 const char * new_class_name = new_class->external_name();
542
543 if (result == MODULE_NOT_READABLE) {
544 assert(module_from->is_named(), "Unnamed modules can read all modules");
545 if (module_to->is_named()) {
546 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
547 strlen(new_class_name) + 2*strlen(module_to_name);
548 msg = NEW_RESOURCE_ARRAY(char, len);
549 jio_snprintf(msg, len - 1,
550 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
551 current_class_name, module_from_name, new_class_name,
552 module_to_name, module_from_name, module_to_name);
553 } else {
554 oop jlm = module_to->module();
555 assert(jlm != nullptr, "Null jlm in module_to ModuleEntry");
556 intptr_t identity_hash = jlm->identity_hash();
557 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
558 strlen(new_class_name) + 2*sizeof(uintx);
559 msg = NEW_RESOURCE_ARRAY(char, len);
560 jio_snprintf(msg, len - 1,
561 "class %s (in module %s) cannot access class %s (in unnamed module @0x%zx) because module %s does not read unnamed module @0x%zx",
562 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
563 module_from_name, uintx(identity_hash));
564 }
565
566 } else if (result == TYPE_NOT_EXPORTED) {
567 assert(new_class->package() != nullptr,
568 "Unnamed packages are always exported");
569 const char * package_name =
570 new_class->package()->name()->as_klass_external_name();
571 assert(module_to->is_named(), "Unnamed modules export all packages");
572 if (module_from->is_named()) {
573 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
574 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
575 msg = NEW_RESOURCE_ARRAY(char, len);
576 jio_snprintf(msg, len - 1,
577 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
578 current_class_name, module_from_name, new_class_name,
579 module_to_name, module_to_name, package_name, module_from_name);
580 } else {
581 oop jlm = module_from->module();
582 assert(jlm != nullptr, "Null jlm in module_from ModuleEntry");
583 intptr_t identity_hash = jlm->identity_hash();
584 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
585 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
586 msg = NEW_RESOURCE_ARRAY(char, len);
587 jio_snprintf(msg, len - 1,
588 "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",
589 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
590 module_to_name, package_name, uintx(identity_hash));
591 }
592 } else {
593 ShouldNotReachHere();
594 }
595 } // result != OTHER_PROBLEM...
596 return msg;
597 }
598
599 bool Reflection::verify_member_access(const Klass* current_class,
600 const Klass* resolved_class,
601 const Klass* member_class,
602 AccessFlags access,
603 bool classloader_only,
604 bool protected_restriction,
605 TRAPS) {
606 // Verify that current_class can access a member of member_class, where that
607 // field's access bits are "access". We assume that we've already verified
608 // that current_class can access member_class.
609 //
610 // If the classloader_only flag is set, we automatically allow any accesses
611 // in which current_class doesn't have a classloader.
612 //
613 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
614 // need this distinction (e.g. if all we have is the runtime type, or during
615 // class file parsing when we only care about the static type); in that case
616 // callers should ensure that resolved_class == member_class.
617 //
618 if ((current_class == nullptr) ||
619 (current_class == member_class) ||
620 access.is_public()) {
621 return true;
622 }
623
624 if (current_class == member_class) {
625 return true;
626 }
627
628 if (access.is_protected()) {
629 if (!protected_restriction) {
630 // See if current_class (or outermost host class) is a subclass of member_class
631 // An interface may not access protected members of j.l.Object
632 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
633 if (access.is_static() || // static fields are ok, see 6622385
634 current_class == resolved_class ||
635 member_class == resolved_class ||
636 current_class->is_subclass_of(resolved_class) ||
637 resolved_class->is_subclass_of(current_class)) {
638 return true;
639 }
640 }
641 }
642 }
643
644 // package access
645 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
646 return true;
647 }
648
649 // private access between different classes needs a nestmate check.
650 if (access.is_private()) {
651 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
652 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
653 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
654 // Nestmate access checks may require resolution and validation of the nest-host.
655 // It is up to the caller to check for pending exceptions and handle appropriately.
656 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
657 if (access) {
658 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
659 return true;
660 }
661 }
662 }
663
664 // Check for special relaxations
665 return can_relax_access_check_for(current_class, member_class, classloader_only);
666 }
667
668 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
669 return InstanceKlass::cast(class1)->is_same_class_package(class2);
670 }
671
672 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
673 // throw an incompatible class change exception
674 // If inner_is_member, require the inner to be a member of the outer.
675 // If !inner_is_member, require the inner to be hidden (non-member).
676 // Caller is responsible for figuring out in advance which case must be true.
677 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
678 bool inner_is_member, TRAPS) {
679 InnerClassesIterator iter(outer);
680 constantPoolHandle cp (THREAD, outer->constants());
681 for (; !iter.done(); iter.next()) {
682 int ioff = iter.inner_class_info_index();
683 int ooff = iter.outer_class_info_index();
684
685 if (inner_is_member && ioff != 0 && ooff != 0) {
686 if (cp->klass_name_at_matches(outer, ooff) &&
687 cp->klass_name_at_matches(inner, ioff)) {
688 Klass* o = cp->klass_at(ooff, CHECK);
689 if (o == outer) {
690 Klass* i = cp->klass_at(ioff, CHECK);
691 if (i == inner) {
692 return;
693 }
694 }
695 }
696 }
697
698 if (!inner_is_member && ioff != 0 && ooff == 0 &&
699 cp->klass_name_at_matches(inner, ioff)) {
700 Klass* i = cp->klass_at(ioff, CHECK);
701 if (i == inner) {
702 return;
703 }
704 }
705 }
706
707 // 'inner' not declared as an inner klass in outer
708 ResourceMark rm(THREAD);
709 // Names are all known to be < 64k so we know this formatted message is not excessively large.
710 Exceptions::fthrow(
711 THREAD_AND_LOCATION,
712 vmSymbols::java_lang_IncompatibleClassChangeError(),
713 "%s and %s disagree on InnerClasses attribute",
714 outer->external_name(),
715 inner->external_name()
716 );
717 }
718
719 static objArrayHandle get_parameter_types(const methodHandle& method,
720 int parameter_count,
721 oop* return_type,
722 TRAPS) {
723 objArrayOop m;
724 if (parameter_count == 0) {
725 // Avoid allocating an array for the empty case
726 // Still need to parse the signature for the return type below
727 m = Universe::the_empty_class_array();
728 } else {
729 // Allocate array holding parameter types (java.lang.Class instances)
730 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
731 }
732 objArrayHandle mirrors(THREAD, m);
733 int index = 0;
734 // Collect parameter types
735 ResourceMark rm(THREAD);
736 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) {
737 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle()));
738 if (log_is_enabled(Debug, class, resolve)) {
739 trace_class_resolution(mirror);
740 }
741 if (!ss.at_return_type()) {
742 mirrors->obj_at_put(index++, mirror);
743 } else if (return_type != nullptr) {
744 // Collect return type as well
745 assert(ss.at_return_type(), "return type should be present");
746 *return_type = mirror;
747 }
748 }
749 assert(index == parameter_count, "invalid parameter count");
750 return mirrors;
751 }
752
753 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) {
754 return method->resolved_checked_exceptions(THREAD);
755 }
756
757 static Handle new_type(Symbol* signature, Klass* k, TRAPS) {
758 ResolvingSignatureStream ss(signature, k, false);
759 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH);
760 if (log_is_enabled(Debug, class, resolve)) {
761 trace_class_resolution(nt);
762 }
763 return Handle(THREAD, nt);
764 }
765
766 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
767 // Allow jdk.internal.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
768 assert(!method()->is_object_initializer() &&
769 (for_constant_pool_access || !method()->is_static_initializer()),
770 "Should not be the initializer");
771 InstanceKlass* holder = method->method_holder();
772 int slot = method->method_idnum();
773
774 Symbol* signature = method->signature();
775 int parameter_count = ArgumentCount(signature).size();
776 oop return_type_oop = nullptr;
777 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
778 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
779
780 Handle return_type(THREAD, return_type_oop);
781
782 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
783 assert(!exception_types.is_null(), "cannot return null");
784
785 Symbol* method_name = method->name();
786 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
787 Handle name = Handle(THREAD, name_oop);
788 if (name == nullptr) return nullptr;
789
790 const int modifiers = method->access_flags().as_method_flags();
791
792 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
793
794 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
795 java_lang_reflect_Method::set_slot(mh(), slot);
796 java_lang_reflect_Method::set_name(mh(), name());
797 java_lang_reflect_Method::set_return_type(mh(), return_type());
798 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
799 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
800 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
801 java_lang_reflect_Method::set_override(mh(), false);
802 if (method->generic_signature() != nullptr) {
803 Symbol* gs = method->generic_signature();
804 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
805 java_lang_reflect_Method::set_signature(mh(), sig());
806 }
807 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
808 java_lang_reflect_Method::set_annotations(mh(), an_oop);
809 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
810 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
811 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
812 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
813 return mh();
814 }
815
816
817 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
818 assert(method()->is_object_initializer(), "Should be the initializer");
819
820 InstanceKlass* holder = method->method_holder();
821 int slot = method->method_idnum();
822
823 Symbol* signature = method->signature();
824 int parameter_count = ArgumentCount(signature).size();
825 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
826 if (parameter_types.is_null()) return nullptr;
827
828 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
829 assert(!exception_types.is_null(), "cannot return null");
830
831 const int modifiers = method->access_flags().as_method_flags();
832
833 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
834
835 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
836 java_lang_reflect_Constructor::set_slot(ch(), slot);
837 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
838 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
839 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
840 java_lang_reflect_Constructor::set_override(ch(), false);
841 if (method->generic_signature() != nullptr) {
842 Symbol* gs = method->generic_signature();
843 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
844 java_lang_reflect_Constructor::set_signature(ch(), sig());
845 }
846 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
847 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
848 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
849 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
850 return ch();
851 }
852
853
854 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
855 Symbol* field_name = fd->name();
856 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
857 Handle name = Handle(THREAD, name_oop);
858 Symbol* signature = fd->signature();
859 InstanceKlass* holder = fd->field_holder();
860 Handle type = new_type(signature, holder, CHECK_NULL);
861 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
862
863 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
864 java_lang_reflect_Field::set_slot(rh(), fd->index());
865 java_lang_reflect_Field::set_name(rh(), name());
866 java_lang_reflect_Field::set_type(rh(), type());
867 if (fd->is_trusted_final()) {
868 java_lang_reflect_Field::set_trusted_final(rh());
869 }
870 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
871 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_field_flags());
872 java_lang_reflect_Field::set_override(rh(), false);
873 if (fd->has_generic_signature()) {
874 Symbol* gs = fd->generic_signature();
875 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
876 java_lang_reflect_Field::set_signature(rh(), sig());
877 }
878 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
879 java_lang_reflect_Field::set_annotations(rh(), an_oop);
880 return rh();
881 }
882
883 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
884 int flags, TRAPS) {
885
886 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
887
888 if(nullptr != sym) {
889 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
890 java_lang_reflect_Parameter::set_name(rh(), name());
891 } else {
892 java_lang_reflect_Parameter::set_name(rh(), nullptr);
893 }
894
895 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
896 java_lang_reflect_Parameter::set_executable(rh(), method());
897 java_lang_reflect_Parameter::set_index(rh(), index);
898 return rh();
899 }
900
901
902 static methodHandle resolve_interface_call(InstanceKlass* klass,
903 const methodHandle& method,
904 Klass* recv_klass,
905 Handle receiver,
906 TRAPS) {
907
908 assert(!method.is_null() , "method should not be null");
909
910 CallInfo info;
911 Symbol* signature = method->signature();
912 Symbol* name = method->name();
913 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
914 LinkInfo(klass, name, signature),
915 true,
916 CHECK_(methodHandle()));
917 return methodHandle(THREAD, info.selected_method());
918 }
919
920 // Narrowing of basic types. Used to create correct jvalues for
921 // boolean, byte, char and short return return values from interpreter
922 // which are returned as ints. Throws IllegalArgumentException.
923 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
924 switch (narrow_type) {
925 case T_BOOLEAN:
926 value->z = (jboolean) (value->i & 1);
927 return;
928 case T_BYTE:
929 value->b = (jbyte)value->i;
930 return;
931 case T_CHAR:
932 value->c = (jchar)value->i;
933 return;
934 case T_SHORT:
935 value->s = (jshort)value->i;
936 return;
937 default:
938 break; // fail
939 }
940 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
941 }
942
943
944 // Method call (shared by invoke_method and invoke_constructor)
945 static oop invoke(InstanceKlass* klass,
946 const methodHandle& reflected_method,
947 Handle receiver,
948 bool override,
949 objArrayHandle ptypes,
950 BasicType rtype,
951 objArrayHandle args,
952 bool is_method_invoke,
953 TRAPS) {
954
955 ResourceMark rm(THREAD);
956
957 methodHandle method; // actual method to invoke
958 Klass* target_klass; // target klass, receiver's klass for non-static
959
960 // Ensure klass is initialized
961 klass->initialize(CHECK_NULL);
962
963 bool is_static = reflected_method->is_static();
964 if (is_static) {
965 // ignore receiver argument
966 method = reflected_method;
967 target_klass = klass;
968 } else {
969 // check for null receiver
970 if (receiver.is_null()) {
971 THROW_NULL(vmSymbols::java_lang_NullPointerException());
972 }
973 // Check class of receiver against class declaring method
974 if (!receiver->is_a(klass)) {
975 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
976 }
977 // target klass is receiver's klass
978 target_klass = receiver->klass();
979 // no need to resolve if method is private or <init>
980 if (reflected_method->is_private() || reflected_method->name() == vmSymbols::object_initializer_name()) {
981 method = reflected_method;
982 } else {
983 // resolve based on the receiver
984 if (reflected_method->method_holder()->is_interface()) {
985 // resolve interface call
986 //
987 // Match resolution errors with those thrown due to reflection inlining
988 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
989 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
990 if (HAS_PENDING_EXCEPTION) {
991 // Method resolution threw an exception; wrap it in an InvocationTargetException
992 oop resolution_exception = PENDING_EXCEPTION;
993 CLEAR_PENDING_EXCEPTION;
994 // JVMTI has already reported the pending exception
995 // JVMTI internal flag reset is needed in order to report InvocationTargetException
996 JvmtiExport::clear_detected_exception(THREAD);
997 JavaCallArguments args(Handle(THREAD, resolution_exception));
998 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
999 vmSymbols::throwable_void_signature(),
1000 &args);
1001 }
1002 } else {
1003 // if the method can be overridden, we resolve using the vtable index.
1004 assert(!reflected_method->has_itable_index(), "");
1005 int index = reflected_method->vtable_index();
1006 method = reflected_method;
1007 if (index != Method::nonvirtual_vtable_index) {
1008 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1009 }
1010 if (!method.is_null()) {
1011 // Check for abstract methods as well
1012 if (method->is_abstract()) {
1013 // new default: 6531596
1014 ResourceMark rm(THREAD);
1015 stringStream ss;
1016 ss.print("'");
1017 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1018 ss.print("'");
1019 Handle h_origexception = Exceptions::new_exception(THREAD,
1020 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1021 JavaCallArguments args(h_origexception);
1022 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1023 vmSymbols::throwable_void_signature(),
1024 &args);
1025 }
1026 }
1027 }
1028 }
1029 }
1030
1031 // I believe this is a ShouldNotGetHere case which requires
1032 // an internal vtable bug. If you ever get this please let Karen know.
1033 if (method.is_null()) {
1034 ResourceMark rm(THREAD);
1035 stringStream ss;
1036 ss.print("'");
1037 Method::print_external_name(&ss, klass,
1038 reflected_method->name(),
1039 reflected_method->signature());
1040 ss.print("'");
1041 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1042 }
1043
1044 assert(ptypes->is_objArray(), "just checking");
1045 int args_len = args.is_null() ? 0 : args->length();
1046 // Check number of arguments
1047 if (ptypes->length() != args_len) {
1048 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1049 "wrong number of arguments");
1050 }
1051
1052 // Create object to contain parameters for the JavaCall
1053 JavaCallArguments java_args(method->size_of_parameters());
1054
1055 if (!is_static) {
1056 java_args.push_oop(receiver);
1057 }
1058
1059 for (int i = 0; i < args_len; i++) {
1060 oop type_mirror = ptypes->obj_at(i);
1061 oop arg = args->obj_at(i);
1062 if (java_lang_Class::is_primitive(type_mirror)) {
1063 jvalue value;
1064 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1065 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1066 if (ptype != atype) {
1067 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1068 }
1069 switch (ptype) {
1070 case T_BOOLEAN: java_args.push_int(value.z); break;
1071 case T_CHAR: java_args.push_int(value.c); break;
1072 case T_BYTE: java_args.push_int(value.b); break;
1073 case T_SHORT: java_args.push_int(value.s); break;
1074 case T_INT: java_args.push_int(value.i); break;
1075 case T_LONG: java_args.push_long(value.j); break;
1076 case T_FLOAT: java_args.push_float(value.f); break;
1077 case T_DOUBLE: java_args.push_double(value.d); break;
1078 default:
1079 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1080 }
1081 } else {
1082 if (arg != nullptr) {
1083 Klass* k = java_lang_Class::as_Klass(type_mirror);
1084 if (!arg->is_a(k)) {
1085 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1086 "argument type mismatch");
1087 }
1088 }
1089 Handle arg_handle(THREAD, arg); // Create handle for argument
1090 java_args.push_oop(arg_handle); // Push handle
1091 }
1092 }
1093
1094 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1095 "just checking");
1096
1097 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1098 // oop (i.e., NOT as an handle)
1099 JavaValue result(rtype);
1100 JavaCalls::call(&result, method, &java_args, THREAD);
1101
1102 if (HAS_PENDING_EXCEPTION) {
1103 // Method threw an exception; wrap it in an InvocationTargetException
1104 oop target_exception = PENDING_EXCEPTION;
1105 CLEAR_PENDING_EXCEPTION;
1106 // JVMTI has already reported the pending exception
1107 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1108 JvmtiExport::clear_detected_exception(THREAD);
1109
1110 JavaCallArguments args(Handle(THREAD, target_exception));
1111 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1112 vmSymbols::throwable_void_signature(),
1113 &args);
1114 } else {
1115 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1116 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1117 }
1118 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1119 }
1120 }
1121
1122 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1123 // of java.lang.reflect.Constructor
1124
1125 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1126 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1127 int slot = java_lang_reflect_Method::slot(method_mirror);
1128 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1129 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1130
1131 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1132 BasicType rtype;
1133 if (java_lang_Class::is_primitive(return_type_mirror)) {
1134 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1135 } else {
1136 rtype = T_OBJECT;
1137 }
1138
1139 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1140 Method* m = klass->method_with_idnum(slot);
1141 if (m == nullptr) {
1142 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1143 }
1144 methodHandle method(THREAD, m);
1145
1146 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1147 }
1148
1149
1150 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1151 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1152 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1153 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1154 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1155
1156 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1157 Method* m = klass->method_with_idnum(slot);
1158 if (m == nullptr) {
1159 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1160 }
1161 methodHandle method(THREAD, m);
1162 assert(method->name() == vmSymbols::object_initializer_name(), "invalid constructor");
1163
1164 // Make sure klass gets initialize
1165 klass->initialize(CHECK_NULL);
1166
1167 // Create new instance (the receiver)
1168 klass->check_valid_for_instantiation(false, CHECK_NULL);
1169 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1170
1171 // Ignore result from call and return receiver
1172 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1173 return receiver();
1174 }