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