1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/packageEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/verifier.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "jvm.h"
36 #include "logging/log.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "memory/universe.hpp"
40 #include "oops/inlineKlass.inline.hpp"
41 #include "oops/instanceKlass.inline.hpp"
42 #include "oops/klass.inline.hpp"
43 #include "oops/objArrayKlass.hpp"
44 #include "oops/objArrayOop.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "oops/typeArrayOop.inline.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "runtime/fieldDescriptor.inline.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/javaThread.hpp"
52 #include "runtime/reflection.hpp"
53 #include "runtime/signature.hpp"
54 #include "runtime/vframe.inline.hpp"
55 #include "utilities/formatBuffer.hpp"
56 #include "utilities/globalDefinitions.hpp"
57
58 static void trace_class_resolution(oop mirror) {
59 if (mirror == nullptr || java_lang_Class::is_primitive(mirror)) {
60 return;
61 }
62 Klass* to_class = java_lang_Class::as_Klass(mirror);
63 ResourceMark rm;
64 int line_number = -1;
65 const char * source_file = nullptr;
66 Klass* caller = nullptr;
67 JavaThread* jthread = JavaThread::current();
68 if (jthread->has_last_Java_frame()) {
69 vframeStream vfst(jthread);
70 // skip over any frames belonging to java.lang.Class
71 while (!vfst.at_end() &&
72 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class()) {
73 vfst.next();
74 }
75 if (!vfst.at_end()) {
76 // this frame is a likely suspect
77 caller = vfst.method()->method_holder();
78 line_number = vfst.method()->line_number_from_bci(vfst.bci());
79 Symbol* s = vfst.method()->method_holder()->source_file_name();
80 if (s != nullptr) {
81 source_file = s->as_C_string();
82 }
83 }
84 }
85 if (caller != nullptr) {
86 const char * from = caller->external_name();
87 const char * to = to_class->external_name();
88 // print in a single call to reduce interleaving between threads
89 if (source_file != nullptr) {
90 log_debug(class, resolve)("%s %s %s:%d (reflection)", from, to, source_file, line_number);
91 } else {
92 log_debug(class, resolve)("%s %s (reflection)", from, to);
93 }
94 }
95 }
96
97
98 oop Reflection::box(jvalue* value, BasicType type, TRAPS) {
99 if (type == T_VOID) {
100 return nullptr;
101 }
102 if (is_reference_type(type)) {
103 // regular objects are not boxed
104 return cast_to_oop(value->l);
105 }
106 oop result = java_lang_boxing_object::create(type, value, CHECK_NULL);
107 if (result == nullptr) {
108 THROW_(vmSymbols::java_lang_IllegalArgumentException(), result);
109 }
110 return result;
111 }
112
113
114 BasicType Reflection::unbox_for_primitive(oop box, jvalue* value, TRAPS) {
115 if (box == nullptr) {
116 THROW_(vmSymbols::java_lang_IllegalArgumentException(), T_ILLEGAL);
117 }
118 return java_lang_boxing_object::get_value(box, value);
119 }
120
121 BasicType Reflection::unbox_for_regular_object(oop box, jvalue* value) {
122 // Note: box is really the unboxed oop. It might even be a Short, etc.!
123 value->l = cast_from_oop<jobject>(box);
124 return T_OBJECT;
125 }
126
127
128 void Reflection::widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS) {
129 assert(wide_type != current_type, "widen should not be called with identical types");
130 switch (wide_type) {
131 case T_BOOLEAN:
132 case T_BYTE:
133 case T_CHAR:
134 break; // fail
135 case T_SHORT:
136 switch (current_type) {
137 case T_BYTE:
138 value->s = (jshort) value->b;
139 return;
140 default:
141 break;
142 }
143 break; // fail
144 case T_INT:
145 switch (current_type) {
146 case T_BYTE:
147 value->i = (jint) value->b;
148 return;
149 case T_CHAR:
150 value->i = (jint) value->c;
151 return;
152 case T_SHORT:
153 value->i = (jint) value->s;
154 return;
155 default:
156 break;
157 }
158 break; // fail
159 case T_LONG:
160 switch (current_type) {
161 case T_BYTE:
162 value->j = (jlong) value->b;
163 return;
164 case T_CHAR:
165 value->j = (jlong) value->c;
166 return;
167 case T_SHORT:
168 value->j = (jlong) value->s;
169 return;
170 case T_INT:
171 value->j = (jlong) value->i;
172 return;
173 default:
174 break;
175 }
176 break; // fail
177 case T_FLOAT:
178 switch (current_type) {
179 case T_BYTE:
180 value->f = (jfloat) value->b;
181 return;
182 case T_CHAR:
183 value->f = (jfloat) value->c;
184 return;
185 case T_SHORT:
186 value->f = (jfloat) value->s;
187 return;
188 case T_INT:
189 value->f = (jfloat) value->i;
190 return;
191 case T_LONG:
192 value->f = (jfloat) value->j;
193 return;
194 default:
195 break;
196 }
197 break; // fail
198 case T_DOUBLE:
199 switch (current_type) {
200 case T_BYTE:
201 value->d = (jdouble) value->b;
202 return;
203 case T_CHAR:
204 value->d = (jdouble) value->c;
205 return;
206 case T_SHORT:
207 value->d = (jdouble) value->s;
208 return;
209 case T_INT:
210 value->d = (jdouble) value->i;
211 return;
212 case T_FLOAT:
213 value->d = (jdouble) value->f;
214 return;
215 case T_LONG:
216 value->d = (jdouble) value->j;
217 return;
218 default:
219 break;
220 }
221 break; // fail
222 default:
223 break; // fail
224 }
225 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
226 }
227
228
229 BasicType Reflection::array_get(jvalue* value, arrayOop a, int index, TRAPS) {
230 if (!a->is_within_bounds(index)) {
231 THROW_(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), T_ILLEGAL);
232 }
233 if (a->is_objArray()) {
234 value->l = cast_from_oop<jobject>(objArrayOop(a)->obj_at(index));
235 return T_OBJECT;
236 } else {
237 assert(a->is_typeArray(), "just checking");
238 BasicType type = TypeArrayKlass::cast(a->klass())->element_type();
239 switch (type) {
240 case T_BOOLEAN:
241 value->z = typeArrayOop(a)->bool_at(index);
242 break;
243 case T_CHAR:
244 value->c = typeArrayOop(a)->char_at(index);
245 break;
246 case T_FLOAT:
247 value->f = typeArrayOop(a)->float_at(index);
248 break;
249 case T_DOUBLE:
250 value->d = typeArrayOop(a)->double_at(index);
251 break;
252 case T_BYTE:
253 value->b = typeArrayOop(a)->byte_at(index);
254 break;
255 case T_SHORT:
256 value->s = typeArrayOop(a)->short_at(index);
257 break;
258 case T_INT:
259 value->i = typeArrayOop(a)->int_at(index);
260 break;
261 case T_LONG:
262 value->j = typeArrayOop(a)->long_at(index);
263 break;
264 default:
265 return T_ILLEGAL;
266 }
267 return type;
268 }
269 }
270
271
272 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) {
273 if (!a->is_within_bounds(index)) {
274 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
275 }
276
277 if (a->is_objArray()) {
278 if (value_type == T_OBJECT) {
279 oop obj = cast_to_oop(value->l);
280 if (a->is_null_free_array() && obj == nullptr) {
281 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "null-restricted array");
282 }
283
284 if (obj != nullptr) {
285 Klass* element_klass = ObjArrayKlass::cast(a->klass())->element_klass();
286 if (!obj->is_a(element_klass)) {
287 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array element type mismatch");
288 }
289 }
290 objArrayOop(a)->obj_at_put(index, obj);
291 }
292 } else {
293 assert(a->is_typeArray(), "just checking");
294 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
295 if (array_type != value_type) {
296 // The widen operation can potentially throw an exception, but cannot block,
297 // so typeArrayOop a is safe if the call succeeds.
298 widen(value, value_type, array_type, CHECK);
299 }
300 switch (array_type) {
301 case T_BOOLEAN:
302 typeArrayOop(a)->bool_at_put(index, value->z);
303 break;
304 case T_CHAR:
305 typeArrayOop(a)->char_at_put(index, value->c);
306 break;
307 case T_FLOAT:
308 typeArrayOop(a)->float_at_put(index, value->f);
309 break;
310 case T_DOUBLE:
311 typeArrayOop(a)->double_at_put(index, value->d);
312 break;
313 case T_BYTE:
314 typeArrayOop(a)->byte_at_put(index, value->b);
315 break;
316 case T_SHORT:
317 typeArrayOop(a)->short_at_put(index, value->s);
318 break;
319 case T_INT:
320 typeArrayOop(a)->int_at_put(index, value->i);
321 break;
322 case T_LONG:
323 typeArrayOop(a)->long_at_put(index, value->j);
324 break;
325 default:
326 THROW(vmSymbols::java_lang_IllegalArgumentException());
327 }
328 }
329 }
330
331 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
332 assert(java_lang_Class::is_primitive(basic_type_mirror), "just checking");
333 BasicType type = java_lang_Class::primitive_type(basic_type_mirror);
334 if (type == T_VOID) {
335 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
336 }
337 else {
338 return Universe::typeArrayKlass(type);
339 }
340 }
341
342 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
343 if (element_mirror == nullptr) {
344 THROW_NULL(vmSymbols::java_lang_NullPointerException());
345 }
346 if (length < 0) {
347 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
348 }
349 if (java_lang_Class::is_primitive(element_mirror)) {
350 Klass* tak = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
351 return TypeArrayKlass::cast(tak)->allocate(length, THREAD);
352 } else {
353 Klass* k = java_lang_Class::as_Klass(element_mirror);
354 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
355 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
356 }
357 return oopFactory::new_objArray(k, length, THREAD);
358 }
359 }
360
361
362 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
363 assert(dim_array->is_typeArray(), "just checking");
364 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
365
366 if (element_mirror == nullptr) {
367 THROW_NULL(vmSymbols::java_lang_NullPointerException());
368 }
369
370 int len = dim_array->length();
371 if (len <= 0 || len > MAX_DIM) {
372 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
373 }
374
375 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
376 for (int i = 0; i < len; i++) {
377 int d = dim_array->int_at(i);
378 if (d < 0) {
379 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
380 }
381 dimensions[i] = d;
382 }
383
384 Klass* klass;
385 int dim = len;
386 if (java_lang_Class::is_primitive(element_mirror)) {
387 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
388 } else {
389 klass = java_lang_Class::as_Klass(element_mirror);
390 if (klass->is_array_klass()) {
391 int k_dim = ArrayKlass::cast(klass)->dimension();
392 if (k_dim + len > MAX_DIM) {
393 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
394 }
395 dim += k_dim;
396 }
397 }
398 klass = klass->array_klass(dim, CHECK_NULL);
399 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
400 assert(obj->is_array(), "just checking");
401 return arrayOop(obj);
402 }
403
404
405 static bool can_relax_access_check_for(const Klass* accessor,
406 const Klass* accessee,
407 bool classloader_only) {
408
409 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
410 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
411
412 if (RelaxAccessControlCheck &&
413 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
414 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
415 return classloader_only &&
416 Verifier::relax_access_for(accessor_ik->class_loader()) &&
417 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
418 accessor_ik->class_loader() == accessee_ik->class_loader();
419 }
420
421 return false;
422 }
423
424 /*
425 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
426
427 Callee T in Callee T in package PT,
428 unnamed module runtime module MT
429 ------------------------------------------------------------------------------------------------
430
431 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
432 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
433 unnamed module: YES
434 Else if (MS can read MT (establish readability) &&
435 ((MT exports PT to MS or to all modules) ||
436 (MT is open))): YES
437
438 ------------------------------------------------------------------------------------------------
439 Caller S in unnamed YES Readability exists because unnamed module
440 module UM "reads" all modules
441 if (MT exports PT to UM or to all modules): YES
442
443 ------------------------------------------------------------------------------------------------
444
445 Note: a loose module is a module that can read all current and future unnamed modules.
446 */
447 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
448 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
449
450 // Verify that current_class can access new_class. If the classloader_only
451 // flag is set, we automatically allow any accesses in which current_class
452 // doesn't have a classloader.
453 if ((current_class == nullptr) ||
454 (current_class == new_class) ||
455 is_same_class_package(current_class, new_class)) {
456 return ACCESS_OK;
457 }
458
459 // module boundaries
460 if (new_class->is_public()) {
461 // Find the module entry for current_class, the accessor
462 ModuleEntry* module_from = current_class->module();
463 // Find the module entry for new_class, the accessee
464 ModuleEntry* module_to = new_class->module();
465
466 // both in same (possibly unnamed) module
467 if (module_from == module_to) {
468 return ACCESS_OK;
469 }
470
471 // Acceptable access to a type in an unnamed module. Note that since
472 // unnamed modules can read all unnamed modules, this also handles the
473 // case where module_from is also unnamed but in a different class loader.
474 if (!module_to->is_named() &&
475 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
476 return ACCESS_OK;
477 }
478
479 // Establish readability, check if module_from is allowed to read module_to.
480 if (!module_from->can_read(module_to)) {
481 return MODULE_NOT_READABLE;
482 }
483
484 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
485 if (module_to->is_open()) {
486 return ACCESS_OK;
487 }
488
489 PackageEntry* package_to = new_class->package();
490 assert(package_to != nullptr, "can not obtain new_class' package");
491
492 {
493 MutexLocker m1(Module_lock);
494
495 // Once readability is established, if module_to exports T unqualifiedly,
496 // (to all modules), than whether module_from is in the unnamed module
497 // or not does not matter, access is allowed.
498 if (package_to->is_unqual_exported()) {
499 return ACCESS_OK;
500 }
501
502 // Access is allowed if both 1 & 2 hold:
503 // 1. Readability, module_from can read module_to (established above).
504 // 2. Either module_to exports T to module_from qualifiedly.
505 // or
506 // module_to exports T to all unnamed modules and module_from is unnamed.
507 // or
508 // module_to exports T unqualifiedly to all modules (checked above).
509 if (!package_to->is_qexported_to(module_from)) {
510 return TYPE_NOT_EXPORTED;
511 }
512 }
513 return ACCESS_OK;
514 }
515
516 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
517 return ACCESS_OK;
518 }
519 return OTHER_PROBLEM;
520 }
521
522 // Return an error message specific to the specified Klass*'s and result.
523 // This function must be called from within a block containing a ResourceMark.
524 char* Reflection::verify_class_access_msg(const Klass* current_class,
525 const InstanceKlass* new_class,
526 const VerifyClassAccessResults result) {
527 assert(result != ACCESS_OK, "must be failure result");
528 char * msg = nullptr;
529 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
530 // Find the module entry for current_class, the accessor
531 ModuleEntry* module_from = current_class->module();
532 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
533 const char * current_class_name = current_class->external_name();
534
535 // Find the module entry for new_class, the accessee
536 ModuleEntry* module_to = nullptr;
537 module_to = new_class->module();
538 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
539 const char * new_class_name = new_class->external_name();
540
541 if (result == MODULE_NOT_READABLE) {
542 assert(module_from->is_named(), "Unnamed modules can read all modules");
543 if (module_to->is_named()) {
544 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
545 strlen(new_class_name) + 2*strlen(module_to_name);
546 msg = NEW_RESOURCE_ARRAY(char, len);
547 jio_snprintf(msg, len - 1,
548 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
549 current_class_name, module_from_name, new_class_name,
550 module_to_name, module_from_name, module_to_name);
551 } else {
552 oop jlm = module_to->module();
553 assert(jlm != nullptr, "Null jlm in module_to ModuleEntry");
554 intptr_t identity_hash = jlm->identity_hash();
555 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
556 strlen(new_class_name) + 2*sizeof(uintx);
557 msg = NEW_RESOURCE_ARRAY(char, len);
558 jio_snprintf(msg, len - 1,
559 "class %s (in module %s) cannot access class %s (in unnamed module @" SIZE_FORMAT_X ") because module %s does not read unnamed module @" SIZE_FORMAT_X,
560 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
561 module_from_name, uintx(identity_hash));
562 }
563
564 } else if (result == TYPE_NOT_EXPORTED) {
565 assert(new_class->package() != nullptr,
566 "Unnamed packages are always exported");
567 const char * package_name =
568 new_class->package()->name()->as_klass_external_name();
569 assert(module_to->is_named(), "Unnamed modules export all packages");
570 if (module_from->is_named()) {
571 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
572 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
573 msg = NEW_RESOURCE_ARRAY(char, len);
574 jio_snprintf(msg, len - 1,
575 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
576 current_class_name, module_from_name, new_class_name,
577 module_to_name, module_to_name, package_name, module_from_name);
578 } else {
579 oop jlm = module_from->module();
580 assert(jlm != nullptr, "Null jlm in module_from ModuleEntry");
581 intptr_t identity_hash = jlm->identity_hash();
582 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
583 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
584 msg = NEW_RESOURCE_ARRAY(char, len);
585 jio_snprintf(msg, len - 1,
586 "class %s (in unnamed module @" SIZE_FORMAT_X ") cannot access class %s (in module %s) because module %s does not export %s to unnamed module @" SIZE_FORMAT_X,
587 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
588 module_to_name, package_name, uintx(identity_hash));
589 }
590 } else {
591 ShouldNotReachHere();
592 }
593 } // result != OTHER_PROBLEM...
594 return msg;
595 }
596
597 bool Reflection::verify_member_access(const Klass* current_class,
598 const Klass* resolved_class,
599 const Klass* member_class,
600 AccessFlags access,
601 bool classloader_only,
602 bool protected_restriction,
603 TRAPS) {
604 // Verify that current_class can access a member of member_class, where that
605 // field's access bits are "access". We assume that we've already verified
606 // that current_class can access member_class.
607 //
608 // If the classloader_only flag is set, we automatically allow any accesses
609 // in which current_class doesn't have a classloader.
610 //
611 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
612 // need this distinction (e.g. if all we have is the runtime type, or during
613 // class file parsing when we only care about the static type); in that case
614 // callers should ensure that resolved_class == member_class.
615 //
616 if ((current_class == nullptr) ||
617 (current_class == member_class) ||
618 access.is_public()) {
619 return true;
620 }
621
622 if (current_class == member_class) {
623 return true;
624 }
625
626 if (access.is_protected()) {
627 if (!protected_restriction) {
628 // See if current_class (or outermost host class) is a subclass of member_class
629 // An interface may not access protected members of j.l.Object
630 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
631 if (access.is_static() || // static fields are ok, see 6622385
632 current_class == resolved_class ||
633 member_class == resolved_class ||
634 current_class->is_subclass_of(resolved_class) ||
635 resolved_class->is_subclass_of(current_class)) {
636 return true;
637 }
638 }
639 }
640 }
641
642 // package access
643 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
644 return true;
645 }
646
647 // private access between different classes needs a nestmate check.
648 if (access.is_private()) {
649 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
650 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
651 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
652 // Nestmate access checks may require resolution and validation of the nest-host.
653 // It is up to the caller to check for pending exceptions and handle appropriately.
654 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
655 if (access) {
656 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
657 return true;
658 }
659 }
660 }
661
662 // Check for special relaxations
663 return can_relax_access_check_for(current_class, member_class, classloader_only);
664 }
665
666 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
667 return InstanceKlass::cast(class1)->is_same_class_package(class2);
668 }
669
670 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
671 // throw an incompatible class change exception
672 // If inner_is_member, require the inner to be a member of the outer.
673 // If !inner_is_member, require the inner to be hidden (non-member).
674 // Caller is responsible for figuring out in advance which case must be true.
675 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
676 bool inner_is_member, TRAPS) {
677 InnerClassesIterator iter(outer);
678 constantPoolHandle cp (THREAD, outer->constants());
679 for (; !iter.done(); iter.next()) {
680 int ioff = iter.inner_class_info_index();
681 int ooff = iter.outer_class_info_index();
682
683 if (inner_is_member && ioff != 0 && ooff != 0) {
684 if (cp->klass_name_at_matches(outer, ooff) &&
685 cp->klass_name_at_matches(inner, ioff)) {
686 Klass* o = cp->klass_at(ooff, CHECK);
687 if (o == outer) {
688 Klass* i = cp->klass_at(ioff, CHECK);
689 if (i == inner) {
690 return;
691 }
692 }
693 }
694 }
695
696 if (!inner_is_member && ioff != 0 && ooff == 0 &&
697 cp->klass_name_at_matches(inner, ioff)) {
698 Klass* i = cp->klass_at(ioff, CHECK);
699 if (i == inner) {
700 return;
701 }
702 }
703 }
704
705 // 'inner' not declared as an inner klass in outer
706 ResourceMark rm(THREAD);
707 Exceptions::fthrow(
708 THREAD_AND_LOCATION,
709 vmSymbols::java_lang_IncompatibleClassChangeError(),
710 "%s and %s disagree on InnerClasses attribute",
711 outer->external_name(),
712 inner->external_name()
713 );
714 }
715
716 static objArrayHandle get_parameter_types(const methodHandle& method,
717 int parameter_count,
718 oop* return_type,
719 TRAPS) {
720 objArrayOop m;
721 if (parameter_count == 0) {
722 // Avoid allocating an array for the empty case
723 // Still need to parse the signature for the return type below
724 m = Universe::the_empty_class_array();
725 } else {
726 // Allocate array holding parameter types (java.lang.Class instances)
727 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
728 }
729 objArrayHandle mirrors(THREAD, m);
730 int index = 0;
731 // Collect parameter types
732 ResourceMark rm(THREAD);
733 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) {
734 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle()));
735 if (log_is_enabled(Debug, class, resolve)) {
736 trace_class_resolution(mirror);
737 }
738 if (!ss.at_return_type()) {
739 mirrors->obj_at_put(index++, mirror);
740 } else if (return_type != nullptr) {
741 // Collect return type as well
742 assert(ss.at_return_type(), "return type should be present");
743 *return_type = mirror;
744 }
745 }
746 assert(index == parameter_count, "invalid parameter count");
747 return mirrors;
748 }
749
750 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) {
751 return method->resolved_checked_exceptions(THREAD);
752 }
753
754 static Handle new_type(Symbol* signature, Klass* k, TRAPS) {
755 ResolvingSignatureStream ss(signature, k, false);
756 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH);
757 return Handle(THREAD, nt);
758 }
759
760 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
761 // Allow jdk.internal.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
762 assert(!method()->name()->starts_with('<') || for_constant_pool_access,
763 "should call new_constructor instead");
764 InstanceKlass* holder = method->method_holder();
765 int slot = method->method_idnum();
766
767 Symbol* signature = method->signature();
768 int parameter_count = ArgumentCount(signature).size();
769 oop return_type_oop = nullptr;
770 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
771 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
772
773 Handle return_type(THREAD, return_type_oop);
774
775 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
776 assert(!exception_types.is_null(), "cannot return null");
777
778 Symbol* method_name = method->name();
779 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
780 Handle name = Handle(THREAD, name_oop);
781 if (name == nullptr) return nullptr;
782
783 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
784
785 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
786
787 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
788 java_lang_reflect_Method::set_slot(mh(), slot);
789 java_lang_reflect_Method::set_name(mh(), name());
790 java_lang_reflect_Method::set_return_type(mh(), return_type());
791 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
792 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
793 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
794 java_lang_reflect_Method::set_override(mh(), false);
795 if (method->generic_signature() != nullptr) {
796 Symbol* gs = method->generic_signature();
797 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
798 java_lang_reflect_Method::set_signature(mh(), sig());
799 }
800 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
801 java_lang_reflect_Method::set_annotations(mh(), an_oop);
802 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
803 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
804 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
805 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
806 return mh();
807 }
808
809
810 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
811 assert(method()->is_object_constructor(),
812 "should call new_method instead");
813
814 InstanceKlass* holder = method->method_holder();
815 int slot = method->method_idnum();
816
817 Symbol* signature = method->signature();
818 int parameter_count = ArgumentCount(signature).size();
819 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
820 if (parameter_types.is_null()) return nullptr;
821
822 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
823 assert(!exception_types.is_null(), "cannot return null");
824
825 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
826
827 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
828
829 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
830 java_lang_reflect_Constructor::set_slot(ch(), slot);
831 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
832 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
833 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
834 java_lang_reflect_Constructor::set_override(ch(), false);
835 if (method->generic_signature() != nullptr) {
836 Symbol* gs = method->generic_signature();
837 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
838 java_lang_reflect_Constructor::set_signature(ch(), sig());
839 }
840 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
841 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
842 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
843 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
844 return ch();
845 }
846
847
848 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
849 Symbol* field_name = fd->name();
850 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
851 Handle name = Handle(THREAD, name_oop);
852 Symbol* signature = fd->signature();
853 InstanceKlass* holder = fd->field_holder();
854 Handle type = new_type(signature, holder, CHECK_NULL);
855 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
856
857 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
858 java_lang_reflect_Field::set_slot(rh(), fd->index());
859 java_lang_reflect_Field::set_name(rh(), name());
860 java_lang_reflect_Field::set_type(rh(), type());
861
862 int flags = 0;
863 if (fd->is_trusted_final()) {
864 flags |= TRUSTED_FINAL;
865 }
866 if (fd->is_null_free_inline_type()) {
867 flags |= NULL_RESTRICTED;
868 }
869 java_lang_reflect_Field::set_flags(rh(), flags);
870
871 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
872 int modifiers = fd->access_flags().as_int();
873 java_lang_reflect_Field::set_modifiers(rh(), modifiers);
874 java_lang_reflect_Field::set_override(rh(), false);
875 if (fd->has_generic_signature()) {
876 Symbol* gs = fd->generic_signature();
877 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
878 java_lang_reflect_Field::set_signature(rh(), sig());
879 }
880 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
881 java_lang_reflect_Field::set_annotations(rh(), an_oop);
882 return rh();
883 }
884
885 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
886 int flags, TRAPS) {
887
888 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
889
890 if(nullptr != sym) {
891 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
892 java_lang_reflect_Parameter::set_name(rh(), name());
893 } else {
894 java_lang_reflect_Parameter::set_name(rh(), nullptr);
895 }
896
897 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
898 java_lang_reflect_Parameter::set_executable(rh(), method());
899 java_lang_reflect_Parameter::set_index(rh(), index);
900 return rh();
901 }
902
903
904 static methodHandle resolve_interface_call(InstanceKlass* klass,
905 const methodHandle& method,
906 Klass* recv_klass,
907 Handle receiver,
908 TRAPS) {
909
910 assert(!method.is_null() , "method should not be null");
911
912 CallInfo info;
913 Symbol* signature = method->signature();
914 Symbol* name = method->name();
915 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
916 LinkInfo(klass, name, signature),
917 true,
918 CHECK_(methodHandle()));
919 return methodHandle(THREAD, info.selected_method());
920 }
921
922 // Conversion
923 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
924 assert(java_lang_Class::is_primitive(basic_type_mirror),
925 "just checking");
926 return java_lang_Class::primitive_type(basic_type_mirror);
927 }
928
929 // Narrowing of basic types. Used to create correct jvalues for
930 // boolean, byte, char and short return return values from interpreter
931 // which are returned as ints. Throws IllegalArgumentException.
932 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
933 switch (narrow_type) {
934 case T_BOOLEAN:
935 value->z = (jboolean) (value->i & 1);
936 return;
937 case T_BYTE:
938 value->b = (jbyte)value->i;
939 return;
940 case T_CHAR:
941 value->c = (jchar)value->i;
942 return;
943 case T_SHORT:
944 value->s = (jshort)value->i;
945 return;
946 default:
947 break; // fail
948 }
949 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
950 }
951
952
953 // Method call (shared by invoke_method and invoke_constructor)
954 static oop invoke(InstanceKlass* klass,
955 const methodHandle& reflected_method,
956 Handle receiver,
957 bool override,
958 objArrayHandle ptypes,
959 BasicType rtype,
960 objArrayHandle args,
961 bool is_method_invoke,
962 TRAPS) {
963
964 ResourceMark rm(THREAD);
965
966 methodHandle method; // actual method to invoke
967 Klass* target_klass; // target klass, receiver's klass for non-static
968
969 // Ensure klass is initialized
970 klass->initialize(CHECK_NULL);
971
972 bool is_static = reflected_method->is_static();
973 if (is_static) {
974 // ignore receiver argument
975 method = reflected_method;
976 target_klass = klass;
977 } else {
978 // check for null receiver
979 if (receiver.is_null()) {
980 THROW_NULL(vmSymbols::java_lang_NullPointerException());
981 }
982 // Check class of receiver against class declaring method
983 if (!receiver->is_a(klass)) {
984 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
985 }
986 // target klass is receiver's klass
987 target_klass = receiver->klass();
988 // no need to resolve if method is private or <init>
989 if (reflected_method->is_private() ||
990 reflected_method->name() == vmSymbols::object_initializer_name()) {
991 method = reflected_method;
992 } else {
993 // resolve based on the receiver
994 if (reflected_method->method_holder()->is_interface()) {
995 // resolve interface call
996 //
997 // Match resolution errors with those thrown due to reflection inlining
998 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
999 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
1000 if (HAS_PENDING_EXCEPTION) {
1001 // Method resolution threw an exception; wrap it in an InvocationTargetException
1002 oop resolution_exception = PENDING_EXCEPTION;
1003 CLEAR_PENDING_EXCEPTION;
1004 // JVMTI has already reported the pending exception
1005 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1006 JvmtiExport::clear_detected_exception(THREAD);
1007 JavaCallArguments args(Handle(THREAD, resolution_exception));
1008 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1009 vmSymbols::throwable_void_signature(),
1010 &args);
1011 }
1012 } else {
1013 // if the method can be overridden, we resolve using the vtable index.
1014 assert(!reflected_method->has_itable_index(), "");
1015 int index = reflected_method->vtable_index();
1016 method = reflected_method;
1017 if (index != Method::nonvirtual_vtable_index) {
1018 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1019 }
1020 if (!method.is_null()) {
1021 // Check for abstract methods as well
1022 if (method->is_abstract()) {
1023 // new default: 6531596
1024 ResourceMark rm(THREAD);
1025 stringStream ss;
1026 ss.print("'");
1027 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1028 ss.print("'");
1029 Handle h_origexception = Exceptions::new_exception(THREAD,
1030 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1031 JavaCallArguments args(h_origexception);
1032 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1033 vmSymbols::throwable_void_signature(),
1034 &args);
1035 }
1036 }
1037 }
1038 }
1039 }
1040
1041 // I believe this is a ShouldNotGetHere case which requires
1042 // an internal vtable bug. If you ever get this please let Karen know.
1043 if (method.is_null()) {
1044 ResourceMark rm(THREAD);
1045 stringStream ss;
1046 ss.print("'");
1047 Method::print_external_name(&ss, klass,
1048 reflected_method->name(),
1049 reflected_method->signature());
1050 ss.print("'");
1051 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1052 }
1053
1054 assert(ptypes->is_objArray(), "just checking");
1055 int args_len = args.is_null() ? 0 : args->length();
1056 // Check number of arguments
1057 if (ptypes->length() != args_len) {
1058 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1059 "wrong number of arguments");
1060 }
1061
1062 // Create object to contain parameters for the JavaCall
1063 JavaCallArguments java_args(method->size_of_parameters());
1064
1065 if (!is_static) {
1066 java_args.push_oop(receiver);
1067 }
1068
1069 for (int i = 0; i < args_len; i++) {
1070 oop type_mirror = ptypes->obj_at(i);
1071 oop arg = args->obj_at(i);
1072 if (java_lang_Class::is_primitive(type_mirror)) {
1073 jvalue value;
1074 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1075 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1076 if (ptype != atype) {
1077 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1078 }
1079 switch (ptype) {
1080 case T_BOOLEAN: java_args.push_int(value.z); break;
1081 case T_CHAR: java_args.push_int(value.c); break;
1082 case T_BYTE: java_args.push_int(value.b); break;
1083 case T_SHORT: java_args.push_int(value.s); break;
1084 case T_INT: java_args.push_int(value.i); break;
1085 case T_LONG: java_args.push_long(value.j); break;
1086 case T_FLOAT: java_args.push_float(value.f); break;
1087 case T_DOUBLE: java_args.push_double(value.d); break;
1088 default:
1089 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1090 }
1091 } else {
1092 if (arg != nullptr) {
1093 Klass* k = java_lang_Class::as_Klass(type_mirror);
1094 if (!arg->is_a(k)) {
1095 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1096 "argument type mismatch");
1097 }
1098 }
1099 Handle arg_handle(THREAD, arg); // Create handle for argument
1100 java_args.push_oop(arg_handle); // Push handle
1101 }
1102 }
1103
1104 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1105 "just checking");
1106
1107 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1108 // oop (i.e., NOT as an handle)
1109 JavaValue result(rtype);
1110 JavaCalls::call(&result, method, &java_args, THREAD);
1111
1112 if (HAS_PENDING_EXCEPTION) {
1113 // Method threw an exception; wrap it in an InvocationTargetException
1114 oop target_exception = PENDING_EXCEPTION;
1115 CLEAR_PENDING_EXCEPTION;
1116 // JVMTI has already reported the pending exception
1117 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1118 JvmtiExport::clear_detected_exception(THREAD);
1119
1120 JavaCallArguments args(Handle(THREAD, target_exception));
1121 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1122 vmSymbols::throwable_void_signature(),
1123 &args);
1124 } else {
1125 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1126 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1127 }
1128 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1129 }
1130 }
1131
1132 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1133 // of java.lang.reflect.Constructor
1134
1135 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1136 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1137 int slot = java_lang_reflect_Method::slot(method_mirror);
1138 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1139 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1140
1141 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1142 BasicType rtype;
1143 if (java_lang_Class::is_primitive(return_type_mirror)) {
1144 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1145 } else {
1146 rtype = T_OBJECT;
1147 }
1148
1149 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1150 Method* m = klass->method_with_idnum(slot);
1151 if (m == nullptr) {
1152 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1153 }
1154 methodHandle method(THREAD, m);
1155
1156 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1157 }
1158
1159
1160 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1161 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1162 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1163 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1164 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1165
1166 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1167 Method* m = klass->method_with_idnum(slot);
1168 if (m == nullptr) {
1169 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1170 }
1171 methodHandle method(THREAD, m);
1172
1173 // Make sure klass gets initialize
1174 klass->initialize(CHECK_NULL);
1175
1176 // Create new instance (the receiver)
1177 klass->check_valid_for_instantiation(false, CHECK_NULL);
1178 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1179
1180 // Ignore result from call and return receiver
1181 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1182 return receiver();
1183 }