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/inlineKlass.inline.hpp"
40 #include "oops/instanceKlass.inline.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "oops/objArrayOop.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/typeArrayOop.inline.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/fieldDescriptor.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/javaThread.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/vframe.inline.hpp"
54 #include "utilities/formatBuffer.hpp"
55 #include "utilities/globalDefinitions.hpp"
56
57 static void trace_class_resolution(oop mirror) {
58 if (mirror == nullptr || java_lang_Class::is_primitive(mirror)) {
59 return;
60 }
61 Klass* to_class = java_lang_Class::as_Klass(mirror);
62 ResourceMark rm;
63 int line_number = -1;
64 const char * source_file = nullptr;
65 Klass* caller = nullptr;
66 JavaThread* jthread = JavaThread::current();
67 if (jthread->has_last_Java_frame()) {
68 vframeStream vfst(jthread);
69 // skip over any frames belonging to java.lang.Class
70 while (!vfst.at_end() &&
71 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class()) {
72 vfst.next();
73 }
74 if (!vfst.at_end()) {
75 // this frame is a likely suspect
76 caller = vfst.method()->method_holder();
77 line_number = vfst.method()->line_number_from_bci(vfst.bci());
78 Symbol* s = vfst.method()->method_holder()->source_file_name();
79 if (s != nullptr) {
80 source_file = s->as_C_string();
81 }
82 }
83 }
84 if (caller != nullptr) {
85 const char * from = caller->external_name();
86 const char * to = to_class->external_name();
87 // print in a single call to reduce interleaving between threads
88 if (source_file != nullptr) {
89 log_debug(class, resolve)("%s %s %s:%d (reflection)", from, to, source_file, line_number);
90 } else {
91 log_debug(class, resolve)("%s %s (reflection)", from, to);
92 }
93 }
94 }
95
96
97 oop Reflection::box(jvalue* value, BasicType type, TRAPS) {
98 if (type == T_VOID) {
99 return nullptr;
100 }
101 if (is_reference_type(type)) {
102 // regular objects are not boxed
103 return cast_to_oop(value->l);
104 }
105 oop result = java_lang_boxing_object::create(type, value, CHECK_NULL);
106 if (result == nullptr) {
107 THROW_(vmSymbols::java_lang_IllegalArgumentException(), result);
108 }
109 return result;
110 }
111
112
113 BasicType Reflection::unbox_for_primitive(oop box, jvalue* value, TRAPS) {
114 if (box == nullptr) {
115 THROW_(vmSymbols::java_lang_IllegalArgumentException(), T_ILLEGAL);
116 }
117 return java_lang_boxing_object::get_value(box, value);
118 }
119
120 BasicType Reflection::unbox_for_regular_object(oop box, jvalue* value) {
121 // Note: box is really the unboxed oop. It might even be a Short, etc.!
122 value->l = cast_from_oop<jobject>(box);
123 return T_OBJECT;
124 }
125
126
127 void Reflection::widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS) {
128 assert(wide_type != current_type, "widen should not be called with identical types");
129 switch (wide_type) {
130 case T_BOOLEAN:
131 case T_BYTE:
132 case T_CHAR:
133 break; // fail
134 case T_SHORT:
135 switch (current_type) {
136 case T_BYTE:
137 value->s = (jshort) value->b;
138 return;
139 default:
140 break;
141 }
142 break; // fail
143 case T_INT:
144 switch (current_type) {
145 case T_BYTE:
146 value->i = (jint) value->b;
147 return;
148 case T_CHAR:
149 value->i = (jint) value->c;
150 return;
151 case T_SHORT:
152 value->i = (jint) value->s;
153 return;
154 default:
155 break;
156 }
157 break; // fail
158 case T_LONG:
159 switch (current_type) {
160 case T_BYTE:
161 value->j = (jlong) value->b;
162 return;
163 case T_CHAR:
164 value->j = (jlong) value->c;
165 return;
166 case T_SHORT:
167 value->j = (jlong) value->s;
168 return;
169 case T_INT:
170 value->j = (jlong) value->i;
171 return;
172 default:
173 break;
174 }
175 break; // fail
176 case T_FLOAT:
177 switch (current_type) {
178 case T_BYTE:
179 value->f = (jfloat) value->b;
180 return;
181 case T_CHAR:
182 value->f = (jfloat) value->c;
183 return;
184 case T_SHORT:
185 value->f = (jfloat) value->s;
186 return;
187 case T_INT:
188 value->f = (jfloat) value->i;
189 return;
190 case T_LONG:
191 value->f = (jfloat) value->j;
192 return;
193 default:
194 break;
195 }
196 break; // fail
197 case T_DOUBLE:
198 switch (current_type) {
199 case T_BYTE:
200 value->d = (jdouble) value->b;
201 return;
202 case T_CHAR:
203 value->d = (jdouble) value->c;
204 return;
205 case T_SHORT:
206 value->d = (jdouble) value->s;
207 return;
208 case T_INT:
209 value->d = (jdouble) value->i;
210 return;
211 case T_FLOAT:
212 value->d = (jdouble) value->f;
213 return;
214 case T_LONG:
215 value->d = (jdouble) value->j;
216 return;
217 default:
218 break;
219 }
220 break; // fail
221 default:
222 break; // fail
223 }
224 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
225 }
226
227
228 BasicType Reflection::array_get(jvalue* value, arrayOop a, int index, TRAPS) {
229 if (!a->is_within_bounds(index)) {
230 THROW_(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), T_ILLEGAL);
231 }
232 if (a->is_objArray()) {
233 oop o = objArrayOop(a)->obj_at(index, CHECK_(T_ILLEGAL)); // reading from a flat array can throw an OOM
234 value->l = cast_from_oop<jobject>(o);
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
332 // Conversion
333 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
334 assert(java_lang_Class::is_primitive(basic_type_mirror),
335 "just checking");
336 return java_lang_Class::primitive_type(basic_type_mirror);
337 }
338
339 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
340 BasicType type = basic_type_mirror_to_basic_type(basic_type_mirror);
341 if (type == T_VOID) {
342 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
343 }
344 else {
345 return Universe::typeArrayKlass(type);
346 }
347 }
348
349 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
350 if (element_mirror == nullptr) {
351 THROW_NULL(vmSymbols::java_lang_NullPointerException());
352 }
353 if (length < 0) {
354 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
355 }
356 if (java_lang_Class::is_primitive(element_mirror)) {
357 BasicType type = basic_type_mirror_to_basic_type(element_mirror);
358 if (type == T_VOID) {
359 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
360 }
361 return oopFactory::new_typeArray(type, length, CHECK_NULL);
362 } else {
363 Klass* k = java_lang_Class::as_Klass(element_mirror);
364 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
365 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
366 }
367 return oopFactory::new_objArray(k, length, THREAD);
368 }
369 }
370
371
372 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
373 assert(dim_array->is_typeArray(), "just checking");
374 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
375
376 if (element_mirror == nullptr) {
377 THROW_NULL(vmSymbols::java_lang_NullPointerException());
378 }
379
380 int len = dim_array->length();
381 if (len <= 0 || len > MAX_DIM) {
382 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
383 }
384
385 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
386 for (int i = 0; i < len; i++) {
387 int d = dim_array->int_at(i);
388 if (d < 0) {
389 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
390 }
391 dimensions[i] = d;
392 }
393
394 Klass* klass;
395 int dim = len;
396 if (java_lang_Class::is_primitive(element_mirror)) {
397 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
398 } else {
399 klass = java_lang_Class::as_Klass(element_mirror);
400 if (klass->is_array_klass()) {
401 int k_dim = ArrayKlass::cast(klass)->dimension();
402 if (k_dim + len > MAX_DIM) {
403 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
404 }
405 dim += k_dim;
406 }
407 }
408 klass = klass->array_klass(dim, CHECK_NULL);
409 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
410 assert(obj->is_array(), "just checking");
411 return arrayOop(obj);
412 }
413
414
415 static bool can_relax_access_check_for(const Klass* accessor,
416 const Klass* accessee,
417 bool classloader_only) {
418
419 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
420 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
421
422 if (RelaxAccessControlCheck &&
423 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
424 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
425 return classloader_only &&
426 Verifier::relax_access_for(accessor_ik->class_loader()) &&
427 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
428 accessor_ik->class_loader() == accessee_ik->class_loader();
429 }
430
431 return false;
432 }
433
434 /*
435 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
436
437 Callee T in Callee T in package PT,
438 unnamed module runtime module MT
439 ------------------------------------------------------------------------------------------------
440
441 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
442 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
443 unnamed module: YES
444 Else if (MS can read MT (establish readability) &&
445 ((MT exports PT to MS or to all modules) ||
446 (MT is open))): YES
447
448 ------------------------------------------------------------------------------------------------
449 Caller S in unnamed YES Readability exists because unnamed module
450 module UM "reads" all modules
451 if (MT exports PT to UM or to all modules): YES
452
453 ------------------------------------------------------------------------------------------------
454
455 Note: a loose module is a module that can read all current and future unnamed modules.
456 */
457 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
458 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
459
460 // Verify that current_class can access new_class. If the classloader_only
461 // flag is set, we automatically allow any accesses in which current_class
462 // doesn't have a classloader.
463 if ((current_class == nullptr) ||
464 (current_class == new_class) ||
465 is_same_class_package(current_class, new_class)) {
466 return ACCESS_OK;
467 }
468
469 // module boundaries
470 if (new_class->is_public()) {
471 // Find the module entry for current_class, the accessor
472 ModuleEntry* module_from = current_class->module();
473 // Find the module entry for new_class, the accessee
474 ModuleEntry* module_to = new_class->module();
475
476 // both in same (possibly unnamed) module
477 if (module_from == module_to) {
478 return ACCESS_OK;
479 }
480
481 // Acceptable access to a type in an unnamed module. Note that since
482 // unnamed modules can read all unnamed modules, this also handles the
483 // case where module_from is also unnamed but in a different class loader.
484 if (!module_to->is_named() &&
485 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
486 return ACCESS_OK;
487 }
488
489 // Establish readability, check if module_from is allowed to read module_to.
490 if (!module_from->can_read(module_to)) {
491 return MODULE_NOT_READABLE;
492 }
493
494 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
495 if (module_to->is_open()) {
496 return ACCESS_OK;
497 }
498
499 PackageEntry* package_to = new_class->package();
500 assert(package_to != nullptr, "can not obtain new_class' package");
501
502 {
503 MutexLocker m1(Module_lock);
504
505 // Once readability is established, if module_to exports T unqualifiedly,
506 // (to all modules), than whether module_from is in the unnamed module
507 // or not does not matter, access is allowed.
508 if (package_to->is_unqual_exported()) {
509 return ACCESS_OK;
510 }
511
512 // Access is allowed if both 1 & 2 hold:
513 // 1. Readability, module_from can read module_to (established above).
514 // 2. Either module_to exports T to module_from qualifiedly.
515 // or
516 // module_to exports T to all unnamed modules and module_from is unnamed.
517 // or
518 // module_to exports T unqualifiedly to all modules (checked above).
519 if (!package_to->is_qexported_to(module_from)) {
520 return TYPE_NOT_EXPORTED;
521 }
522 }
523 return ACCESS_OK;
524 }
525
526 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
527 return ACCESS_OK;
528 }
529 return OTHER_PROBLEM;
530 }
531
532 // Return an error message specific to the specified Klass*'s and result.
533 // This function must be called from within a block containing a ResourceMark.
534 char* Reflection::verify_class_access_msg(const Klass* current_class,
535 const InstanceKlass* new_class,
536 const VerifyClassAccessResults result) {
537 assert(result != ACCESS_OK, "must be failure result");
538 char * msg = nullptr;
539 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
540 // Find the module entry for current_class, the accessor
541 ModuleEntry* module_from = current_class->module();
542 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
543 const char * current_class_name = current_class->external_name();
544
545 // Find the module entry for new_class, the accessee
546 ModuleEntry* module_to = nullptr;
547 module_to = new_class->module();
548 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
549 const char * new_class_name = new_class->external_name();
550
551 if (result == MODULE_NOT_READABLE) {
552 assert(module_from->is_named(), "Unnamed modules can read all modules");
553 if (module_to->is_named()) {
554 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
555 strlen(new_class_name) + 2*strlen(module_to_name);
556 msg = NEW_RESOURCE_ARRAY(char, len);
557 jio_snprintf(msg, len - 1,
558 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
559 current_class_name, module_from_name, new_class_name,
560 module_to_name, module_from_name, module_to_name);
561 } else {
562 oop jlm = module_to->module();
563 assert(jlm != nullptr, "Null jlm in module_to ModuleEntry");
564 intptr_t identity_hash = jlm->identity_hash();
565 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
566 strlen(new_class_name) + 2*sizeof(uintx);
567 msg = NEW_RESOURCE_ARRAY(char, len);
568 jio_snprintf(msg, len - 1,
569 "class %s (in module %s) cannot access class %s (in unnamed module @0x%zx) because module %s does not read unnamed module @0x%zx",
570 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
571 module_from_name, uintx(identity_hash));
572 }
573
574 } else if (result == TYPE_NOT_EXPORTED) {
575 assert(new_class->package() != nullptr,
576 "Unnamed packages are always exported");
577 const char * package_name =
578 new_class->package()->name()->as_klass_external_name();
579 assert(module_to->is_named(), "Unnamed modules export all packages");
580 if (module_from->is_named()) {
581 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
582 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
583 msg = NEW_RESOURCE_ARRAY(char, len);
584 jio_snprintf(msg, len - 1,
585 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
586 current_class_name, module_from_name, new_class_name,
587 module_to_name, module_to_name, package_name, module_from_name);
588 } else {
589 oop jlm = module_from->module();
590 assert(jlm != nullptr, "Null jlm in module_from ModuleEntry");
591 intptr_t identity_hash = jlm->identity_hash();
592 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
593 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
594 msg = NEW_RESOURCE_ARRAY(char, len);
595 jio_snprintf(msg, len - 1,
596 "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",
597 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
598 module_to_name, package_name, uintx(identity_hash));
599 }
600 } else {
601 ShouldNotReachHere();
602 }
603 } // result != OTHER_PROBLEM...
604 return msg;
605 }
606
607 bool Reflection::verify_member_access(const Klass* current_class,
608 const Klass* resolved_class,
609 const Klass* member_class,
610 AccessFlags access,
611 bool classloader_only,
612 bool protected_restriction,
613 TRAPS) {
614 // Verify that current_class can access a member of member_class, where that
615 // field's access bits are "access". We assume that we've already verified
616 // that current_class can access member_class.
617 //
618 // If the classloader_only flag is set, we automatically allow any accesses
619 // in which current_class doesn't have a classloader.
620 //
621 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
622 // need this distinction (e.g. if all we have is the runtime type, or during
623 // class file parsing when we only care about the static type); in that case
624 // callers should ensure that resolved_class == member_class.
625 //
626 if ((current_class == nullptr) ||
627 (current_class == member_class) ||
628 access.is_public()) {
629 return true;
630 }
631
632 if (current_class == member_class) {
633 return true;
634 }
635
636 if (access.is_protected()) {
637 if (!protected_restriction) {
638 // See if current_class (or outermost host class) is a subclass of member_class
639 // An interface may not access protected members of j.l.Object
640 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
641 if (access.is_static() || // static fields are ok, see 6622385
642 current_class == resolved_class ||
643 member_class == resolved_class ||
644 current_class->is_subclass_of(resolved_class) ||
645 resolved_class->is_subclass_of(current_class)) {
646 return true;
647 }
648 }
649 }
650 }
651
652 // package access
653 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
654 return true;
655 }
656
657 // private access between different classes needs a nestmate check.
658 if (access.is_private()) {
659 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
660 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
661 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
662 // Nestmate access checks may require resolution and validation of the nest-host.
663 // It is up to the caller to check for pending exceptions and handle appropriately.
664 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
665 if (access) {
666 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
667 return true;
668 }
669 }
670 }
671
672 // Check for special relaxations
673 return can_relax_access_check_for(current_class, member_class, classloader_only);
674 }
675
676 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
677 return InstanceKlass::cast(class1)->is_same_class_package(class2);
678 }
679
680 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
681 // throw an incompatible class change exception
682 // If inner_is_member, require the inner to be a member of the outer.
683 // If !inner_is_member, require the inner to be hidden (non-member).
684 // Caller is responsible for figuring out in advance which case must be true.
685 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
686 bool inner_is_member, TRAPS) {
687 InnerClassesIterator iter(outer);
688 constantPoolHandle cp (THREAD, outer->constants());
689 for (; !iter.done(); iter.next()) {
690 int ioff = iter.inner_class_info_index();
691 int ooff = iter.outer_class_info_index();
692
693 if (inner_is_member && ioff != 0 && ooff != 0) {
694 if (cp->klass_name_at_matches(outer, ooff) &&
695 cp->klass_name_at_matches(inner, ioff)) {
696 Klass* o = cp->klass_at(ooff, CHECK);
697 if (o == outer) {
698 Klass* i = cp->klass_at(ioff, CHECK);
699 if (i == inner) {
700 return;
701 }
702 }
703 }
704 }
705
706 if (!inner_is_member && ioff != 0 && ooff == 0 &&
707 cp->klass_name_at_matches(inner, ioff)) {
708 Klass* i = cp->klass_at(ioff, CHECK);
709 if (i == inner) {
710 return;
711 }
712 }
713 }
714
715 // 'inner' not declared as an inner klass in outer
716 ResourceMark rm(THREAD);
717 // Names are all known to be < 64k so we know this formatted message is not excessively large.
718 Exceptions::fthrow(
719 THREAD_AND_LOCATION,
720 vmSymbols::java_lang_IncompatibleClassChangeError(),
721 "%s and %s disagree on InnerClasses attribute",
722 outer->external_name(),
723 inner->external_name()
724 );
725 }
726
727 static objArrayHandle get_parameter_types(const methodHandle& method,
728 int parameter_count,
729 oop* return_type,
730 TRAPS) {
731 objArrayOop m;
732 if (parameter_count == 0) {
733 // Avoid allocating an array for the empty case
734 // Still need to parse the signature for the return type below
735 m = Universe::the_empty_class_array();
736 } else {
737 // Allocate array holding parameter types (java.lang.Class instances)
738 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
739 }
740 objArrayHandle mirrors(THREAD, m);
741 int index = 0;
742 // Collect parameter types
743 ResourceMark rm(THREAD);
744 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) {
745 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle()));
746 if (log_is_enabled(Debug, class, resolve)) {
747 trace_class_resolution(mirror);
748 }
749 if (!ss.at_return_type()) {
750 mirrors->obj_at_put(index++, mirror);
751 } else if (return_type != nullptr) {
752 // Collect return type as well
753 assert(ss.at_return_type(), "return type should be present");
754 *return_type = mirror;
755 }
756 }
757 assert(index == parameter_count, "invalid parameter count");
758 return mirrors;
759 }
760
761 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) {
762 return method->resolved_checked_exceptions(THREAD);
763 }
764
765 static Handle new_type(Symbol* signature, Klass* k, TRAPS) {
766 ResolvingSignatureStream ss(signature, k, false);
767 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH);
768 return Handle(THREAD, nt);
769 }
770
771 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
772 // Allow jdk.internal.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
773 assert(!method()->name()->starts_with('<') || for_constant_pool_access,
774 "should call new_constructor instead");
775 InstanceKlass* holder = method->method_holder();
776 int slot = method->method_idnum();
777
778 Symbol* signature = method->signature();
779 int parameter_count = ArgumentCount(signature).size();
780 oop return_type_oop = nullptr;
781 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
782 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
783
784 Handle return_type(THREAD, return_type_oop);
785
786 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
787 assert(!exception_types.is_null(), "cannot return null");
788
789 Symbol* method_name = method->name();
790 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
791 Handle name = Handle(THREAD, name_oop);
792 if (name == nullptr) return nullptr;
793
794 const int modifiers = method->access_flags().as_method_flags();
795
796 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
797
798 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
799 java_lang_reflect_Method::set_slot(mh(), slot);
800 java_lang_reflect_Method::set_name(mh(), name());
801 java_lang_reflect_Method::set_return_type(mh(), return_type());
802 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
803 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
804 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
805 java_lang_reflect_Method::set_override(mh(), false);
806 if (method->generic_signature() != nullptr) {
807 Symbol* gs = method->generic_signature();
808 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
809 java_lang_reflect_Method::set_signature(mh(), sig());
810 }
811 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
812 java_lang_reflect_Method::set_annotations(mh(), an_oop);
813 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
814 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
815 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
816 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
817 return mh();
818 }
819
820
821 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
822 assert(method()->is_object_constructor(),
823 "should call new_method instead");
824
825 InstanceKlass* holder = method->method_holder();
826 int slot = method->method_idnum();
827
828 Symbol* signature = method->signature();
829 int parameter_count = ArgumentCount(signature).size();
830 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
831 if (parameter_types.is_null()) return nullptr;
832
833 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
834 assert(!exception_types.is_null(), "cannot return null");
835
836 const int modifiers = method->access_flags().as_method_flags();
837
838 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
839
840 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
841 java_lang_reflect_Constructor::set_slot(ch(), slot);
842 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
843 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
844 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
845 java_lang_reflect_Constructor::set_override(ch(), false);
846 if (method->generic_signature() != nullptr) {
847 Symbol* gs = method->generic_signature();
848 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
849 java_lang_reflect_Constructor::set_signature(ch(), sig());
850 }
851 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
852 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
853 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
854 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
855 return ch();
856 }
857
858
859 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
860 Symbol* field_name = fd->name();
861 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
862 Handle name = Handle(THREAD, name_oop);
863 Symbol* signature = fd->signature();
864 InstanceKlass* holder = fd->field_holder();
865 Handle type = new_type(signature, holder, CHECK_NULL);
866 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
867
868 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
869 java_lang_reflect_Field::set_slot(rh(), fd->index());
870 java_lang_reflect_Field::set_name(rh(), name());
871 java_lang_reflect_Field::set_type(rh(), type());
872
873 int flags = 0;
874 if (fd->is_trusted_final()) {
875 flags |= TRUSTED_FINAL;
876 }
877 if (fd->is_null_free_inline_type()) {
878 flags |= NULL_RESTRICTED;
879 }
880 java_lang_reflect_Field::set_flags(rh(), flags);
881
882 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
883 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_field_flags());
884 java_lang_reflect_Field::set_override(rh(), false);
885 if (fd->has_generic_signature()) {
886 Symbol* gs = fd->generic_signature();
887 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
888 java_lang_reflect_Field::set_signature(rh(), sig());
889 }
890 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
891 java_lang_reflect_Field::set_annotations(rh(), an_oop);
892 return rh();
893 }
894
895 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
896 int flags, TRAPS) {
897
898 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
899
900 if(nullptr != sym) {
901 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
902 java_lang_reflect_Parameter::set_name(rh(), name());
903 } else {
904 java_lang_reflect_Parameter::set_name(rh(), nullptr);
905 }
906
907 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
908 java_lang_reflect_Parameter::set_executable(rh(), method());
909 java_lang_reflect_Parameter::set_index(rh(), index);
910 return rh();
911 }
912
913
914 static methodHandle resolve_interface_call(InstanceKlass* klass,
915 const methodHandle& method,
916 Klass* recv_klass,
917 Handle receiver,
918 TRAPS) {
919
920 assert(!method.is_null() , "method should not be null");
921
922 CallInfo info;
923 Symbol* signature = method->signature();
924 Symbol* name = method->name();
925 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
926 LinkInfo(klass, name, signature),
927 true,
928 CHECK_(methodHandle()));
929 return methodHandle(THREAD, info.selected_method());
930 }
931
932 // Narrowing of basic types. Used to create correct jvalues for
933 // boolean, byte, char and short return return values from interpreter
934 // which are returned as ints. Throws IllegalArgumentException.
935 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
936 switch (narrow_type) {
937 case T_BOOLEAN:
938 value->z = (jboolean) (value->i & 1);
939 return;
940 case T_BYTE:
941 value->b = (jbyte)value->i;
942 return;
943 case T_CHAR:
944 value->c = (jchar)value->i;
945 return;
946 case T_SHORT:
947 value->s = (jshort)value->i;
948 return;
949 default:
950 break; // fail
951 }
952 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
953 }
954
955
956 // Method call (shared by invoke_method and invoke_constructor)
957 static oop invoke(InstanceKlass* klass,
958 const methodHandle& reflected_method,
959 Handle receiver,
960 bool override,
961 objArrayHandle ptypes,
962 BasicType rtype,
963 objArrayHandle args,
964 bool is_method_invoke,
965 TRAPS) {
966
967 ResourceMark rm(THREAD);
968
969 methodHandle method; // actual method to invoke
970 Klass* target_klass; // target klass, receiver's klass for non-static
971
972 // Ensure klass is initialized
973 klass->initialize(CHECK_NULL);
974
975 bool is_static = reflected_method->is_static();
976 if (is_static) {
977 // ignore receiver argument
978 method = reflected_method;
979 target_klass = klass;
980 } else {
981 // check for null receiver
982 if (receiver.is_null()) {
983 THROW_NULL(vmSymbols::java_lang_NullPointerException());
984 }
985 // Check class of receiver against class declaring method
986 if (!receiver->is_a(klass)) {
987 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
988 }
989 // target klass is receiver's klass
990 target_klass = receiver->klass();
991 // no need to resolve if method is private or <init>
992 if (reflected_method->is_private() ||
993 reflected_method->name() == vmSymbols::object_initializer_name()) {
994 method = reflected_method;
995 } else {
996 // resolve based on the receiver
997 if (reflected_method->method_holder()->is_interface()) {
998 // resolve interface call
999 //
1000 // Match resolution errors with those thrown due to reflection inlining
1001 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
1002 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
1003 if (HAS_PENDING_EXCEPTION) {
1004 // Method resolution threw an exception; wrap it in an InvocationTargetException
1005 oop resolution_exception = PENDING_EXCEPTION;
1006 CLEAR_PENDING_EXCEPTION;
1007 // JVMTI has already reported the pending exception
1008 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1009 JvmtiExport::clear_detected_exception(THREAD);
1010 JavaCallArguments args(Handle(THREAD, resolution_exception));
1011 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1012 vmSymbols::throwable_void_signature(),
1013 &args);
1014 }
1015 } else {
1016 // if the method can be overridden, we resolve using the vtable index.
1017 assert(!reflected_method->has_itable_index(), "");
1018 int index = reflected_method->vtable_index();
1019 method = reflected_method;
1020 if (index != Method::nonvirtual_vtable_index) {
1021 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1022 }
1023 if (!method.is_null()) {
1024 // Check for abstract methods as well
1025 if (method->is_abstract()) {
1026 // new default: 6531596
1027 ResourceMark rm(THREAD);
1028 stringStream ss;
1029 ss.print("'");
1030 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1031 ss.print("'");
1032 Handle h_origexception = Exceptions::new_exception(THREAD,
1033 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1034 JavaCallArguments args(h_origexception);
1035 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1036 vmSymbols::throwable_void_signature(),
1037 &args);
1038 }
1039 }
1040 }
1041 }
1042 }
1043
1044 // I believe this is a ShouldNotGetHere case which requires
1045 // an internal vtable bug. If you ever get this please let Karen know.
1046 if (method.is_null()) {
1047 ResourceMark rm(THREAD);
1048 stringStream ss;
1049 ss.print("'");
1050 Method::print_external_name(&ss, klass,
1051 reflected_method->name(),
1052 reflected_method->signature());
1053 ss.print("'");
1054 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1055 }
1056
1057 assert(ptypes->is_objArray(), "just checking");
1058 int args_len = args.is_null() ? 0 : args->length();
1059 // Check number of arguments
1060 if (ptypes->length() != args_len) {
1061 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1062 "wrong number of arguments");
1063 }
1064
1065 // Create object to contain parameters for the JavaCall
1066 JavaCallArguments java_args(method->size_of_parameters());
1067
1068 if (!is_static) {
1069 java_args.push_oop(receiver);
1070 }
1071
1072 for (int i = 0; i < args_len; i++) {
1073 oop type_mirror = ptypes->obj_at(i, CHECK_NULL);
1074 oop arg = args->obj_at(i, CHECK_NULL);
1075 if (java_lang_Class::is_primitive(type_mirror)) {
1076 jvalue value;
1077 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1078 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1079 if (ptype != atype) {
1080 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1081 }
1082 switch (ptype) {
1083 case T_BOOLEAN: java_args.push_int(value.z); break;
1084 case T_CHAR: java_args.push_int(value.c); break;
1085 case T_BYTE: java_args.push_int(value.b); break;
1086 case T_SHORT: java_args.push_int(value.s); break;
1087 case T_INT: java_args.push_int(value.i); break;
1088 case T_LONG: java_args.push_long(value.j); break;
1089 case T_FLOAT: java_args.push_float(value.f); break;
1090 case T_DOUBLE: java_args.push_double(value.d); break;
1091 default:
1092 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1093 }
1094 } else {
1095 if (arg != nullptr) {
1096 Klass* k = java_lang_Class::as_Klass(type_mirror);
1097 if (!arg->is_a(k)) {
1098 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1099 "argument type mismatch");
1100 }
1101 }
1102 Handle arg_handle(THREAD, arg); // Create handle for argument
1103 java_args.push_oop(arg_handle); // Push handle
1104 }
1105 }
1106
1107 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1108 "just checking");
1109
1110 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1111 // oop (i.e., NOT as an handle)
1112 JavaValue result(rtype);
1113 JavaCalls::call(&result, method, &java_args, THREAD);
1114
1115 if (HAS_PENDING_EXCEPTION) {
1116 // Method threw an exception; wrap it in an InvocationTargetException
1117 oop target_exception = PENDING_EXCEPTION;
1118 CLEAR_PENDING_EXCEPTION;
1119 // JVMTI has already reported the pending exception
1120 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1121 JvmtiExport::clear_detected_exception(THREAD);
1122
1123 JavaCallArguments args(Handle(THREAD, target_exception));
1124 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1125 vmSymbols::throwable_void_signature(),
1126 &args);
1127 } else {
1128 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1129 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1130 }
1131 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1132 }
1133 }
1134
1135 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1136 // of java.lang.reflect.Constructor
1137
1138 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1139 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1140 int slot = java_lang_reflect_Method::slot(method_mirror);
1141 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1142 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1143
1144 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1145 BasicType rtype;
1146 if (java_lang_Class::is_primitive(return_type_mirror)) {
1147 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1148 } else {
1149 rtype = T_OBJECT;
1150 }
1151
1152 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1153 Method* m = klass->method_with_idnum(slot);
1154 if (m == nullptr) {
1155 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1156 }
1157 methodHandle method(THREAD, m);
1158
1159 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1160 }
1161
1162
1163 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1164 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1165 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1166 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1167 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1168
1169 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1170 Method* m = klass->method_with_idnum(slot);
1171 if (m == nullptr) {
1172 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1173 }
1174 methodHandle method(THREAD, m);
1175
1176 // Make sure klass gets initialize
1177 klass->initialize(CHECK_NULL);
1178
1179 // Create new instance (the receiver)
1180 klass->check_valid_for_instantiation(false, CHECK_NULL);
1181 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1182
1183 // Ignore result from call and return receiver
1184 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1185 return receiver();
1186 }