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 value->l = cast_from_oop<jobject>(objArrayOop(a)->obj_at(index));
234 return T_OBJECT;
235 } else {
236 assert(a->is_typeArray(), "just checking");
237 BasicType type = TypeArrayKlass::cast(a->klass())->element_type();
238 switch (type) {
239 case T_BOOLEAN:
240 value->z = typeArrayOop(a)->bool_at(index);
241 break;
242 case T_CHAR:
243 value->c = typeArrayOop(a)->char_at(index);
244 break;
245 case T_FLOAT:
246 value->f = typeArrayOop(a)->float_at(index);
247 break;
248 case T_DOUBLE:
249 value->d = typeArrayOop(a)->double_at(index);
250 break;
251 case T_BYTE:
252 value->b = typeArrayOop(a)->byte_at(index);
253 break;
254 case T_SHORT:
255 value->s = typeArrayOop(a)->short_at(index);
256 break;
257 case T_INT:
258 value->i = typeArrayOop(a)->int_at(index);
259 break;
260 case T_LONG:
261 value->j = typeArrayOop(a)->long_at(index);
262 break;
263 default:
264 return T_ILLEGAL;
265 }
266 return type;
267 }
268 }
269
270
271 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) {
272 if (!a->is_within_bounds(index)) {
273 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
274 }
275
276 if (a->is_objArray()) {
277 if (value_type == T_OBJECT) {
278 oop obj = cast_to_oop(value->l);
279 if (a->is_null_free_array() && obj == nullptr) {
280 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "null-restricted array");
281 }
282
283 if (obj != nullptr) {
284 Klass* element_klass = ObjArrayKlass::cast(a->klass())->element_klass();
285 if (!obj->is_a(element_klass)) {
286 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array element type mismatch");
287 }
288 }
289 objArrayOop(a)->obj_at_put(index, obj);
290 }
291 } else {
292 assert(a->is_typeArray(), "just checking");
293 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
294 if (array_type != value_type) {
295 // The widen operation can potentially throw an exception, but cannot block,
296 // so typeArrayOop a is safe if the call succeeds.
297 widen(value, value_type, array_type, CHECK);
298 }
299 switch (array_type) {
300 case T_BOOLEAN:
301 typeArrayOop(a)->bool_at_put(index, value->z);
302 break;
303 case T_CHAR:
304 typeArrayOop(a)->char_at_put(index, value->c);
305 break;
306 case T_FLOAT:
307 typeArrayOop(a)->float_at_put(index, value->f);
308 break;
309 case T_DOUBLE:
310 typeArrayOop(a)->double_at_put(index, value->d);
311 break;
312 case T_BYTE:
313 typeArrayOop(a)->byte_at_put(index, value->b);
314 break;
315 case T_SHORT:
316 typeArrayOop(a)->short_at_put(index, value->s);
317 break;
318 case T_INT:
319 typeArrayOop(a)->int_at_put(index, value->i);
320 break;
321 case T_LONG:
322 typeArrayOop(a)->long_at_put(index, value->j);
323 break;
324 default:
325 THROW(vmSymbols::java_lang_IllegalArgumentException());
326 }
327 }
328 }
329
330 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
331 assert(java_lang_Class::is_primitive(basic_type_mirror), "just checking");
332 BasicType type = java_lang_Class::primitive_type(basic_type_mirror);
333 if (type == T_VOID) {
334 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
335 }
336 else {
337 return Universe::typeArrayKlass(type);
338 }
339 }
340
341 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
342 if (element_mirror == nullptr) {
343 THROW_NULL(vmSymbols::java_lang_NullPointerException());
344 }
345 if (length < 0) {
346 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
347 }
348 if (java_lang_Class::is_primitive(element_mirror)) {
349 Klass* tak = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
350 return TypeArrayKlass::cast(tak)->allocate(length, THREAD);
351 } else {
352 Klass* k = java_lang_Class::as_Klass(element_mirror);
353 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
354 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
355 }
356 return oopFactory::new_objArray(k, length, THREAD);
357 }
358 }
359
360
361 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
362 assert(dim_array->is_typeArray(), "just checking");
363 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
364
365 if (element_mirror == nullptr) {
366 THROW_NULL(vmSymbols::java_lang_NullPointerException());
367 }
368
369 int len = dim_array->length();
370 if (len <= 0 || len > MAX_DIM) {
371 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
372 }
373
374 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
375 for (int i = 0; i < len; i++) {
376 int d = dim_array->int_at(i);
377 if (d < 0) {
378 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
379 }
380 dimensions[i] = d;
381 }
382
383 Klass* klass;
384 int dim = len;
385 if (java_lang_Class::is_primitive(element_mirror)) {
386 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
387 } else {
388 klass = java_lang_Class::as_Klass(element_mirror);
389 if (klass->is_array_klass()) {
390 int k_dim = ArrayKlass::cast(klass)->dimension();
391 if (k_dim + len > MAX_DIM) {
392 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
393 }
394 dim += k_dim;
395 }
396 }
397 klass = klass->array_klass(dim, CHECK_NULL);
398 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
399 assert(obj->is_array(), "just checking");
400 return arrayOop(obj);
401 }
402
403
404 static bool can_relax_access_check_for(const Klass* accessor,
405 const Klass* accessee,
406 bool classloader_only) {
407
408 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
409 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
410
411 if (RelaxAccessControlCheck &&
412 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
413 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
414 return classloader_only &&
415 Verifier::relax_access_for(accessor_ik->class_loader()) &&
416 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
417 accessor_ik->class_loader() == accessee_ik->class_loader();
418 }
419
420 return false;
421 }
422
423 /*
424 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
425
426 Callee T in Callee T in package PT,
427 unnamed module runtime module MT
428 ------------------------------------------------------------------------------------------------
429
430 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
431 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
432 unnamed module: YES
433 Else if (MS can read MT (establish readability) &&
434 ((MT exports PT to MS or to all modules) ||
435 (MT is open))): YES
436
437 ------------------------------------------------------------------------------------------------
438 Caller S in unnamed YES Readability exists because unnamed module
439 module UM "reads" all modules
440 if (MT exports PT to UM or to all modules): YES
441
442 ------------------------------------------------------------------------------------------------
443
444 Note: a loose module is a module that can read all current and future unnamed modules.
445 */
446 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
447 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
448
449 // Verify that current_class can access new_class. If the classloader_only
450 // flag is set, we automatically allow any accesses in which current_class
451 // doesn't have a classloader.
452 if ((current_class == nullptr) ||
453 (current_class == new_class) ||
454 is_same_class_package(current_class, new_class)) {
455 return ACCESS_OK;
456 }
457
458 // module boundaries
459 if (new_class->is_public()) {
460 // Find the module entry for current_class, the accessor
461 ModuleEntry* module_from = current_class->module();
462 // Find the module entry for new_class, the accessee
463 ModuleEntry* module_to = new_class->module();
464
465 // both in same (possibly unnamed) module
466 if (module_from == module_to) {
467 return ACCESS_OK;
468 }
469
470 // Acceptable access to a type in an unnamed module. Note that since
471 // unnamed modules can read all unnamed modules, this also handles the
472 // case where module_from is also unnamed but in a different class loader.
473 if (!module_to->is_named() &&
474 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
475 return ACCESS_OK;
476 }
477
478 // Establish readability, check if module_from is allowed to read module_to.
479 if (!module_from->can_read(module_to)) {
480 return MODULE_NOT_READABLE;
481 }
482
483 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
484 if (module_to->is_open()) {
485 return ACCESS_OK;
486 }
487
488 PackageEntry* package_to = new_class->package();
489 assert(package_to != nullptr, "can not obtain new_class' package");
490
491 {
492 MutexLocker m1(Module_lock);
493
494 // Once readability is established, if module_to exports T unqualifiedly,
495 // (to all modules), than whether module_from is in the unnamed module
496 // or not does not matter, access is allowed.
497 if (package_to->is_unqual_exported()) {
498 return ACCESS_OK;
499 }
500
501 // Access is allowed if both 1 & 2 hold:
502 // 1. Readability, module_from can read module_to (established above).
503 // 2. Either module_to exports T to module_from qualifiedly.
504 // or
505 // module_to exports T to all unnamed modules and module_from is unnamed.
506 // or
507 // module_to exports T unqualifiedly to all modules (checked above).
508 if (!package_to->is_qexported_to(module_from)) {
509 return TYPE_NOT_EXPORTED;
510 }
511 }
512 return ACCESS_OK;
513 }
514
515 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
516 return ACCESS_OK;
517 }
518 return OTHER_PROBLEM;
519 }
520
521 // Return an error message specific to the specified Klass*'s and result.
522 // This function must be called from within a block containing a ResourceMark.
523 char* Reflection::verify_class_access_msg(const Klass* current_class,
524 const InstanceKlass* new_class,
525 const VerifyClassAccessResults result) {
526 assert(result != ACCESS_OK, "must be failure result");
527 char * msg = nullptr;
528 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
529 // Find the module entry for current_class, the accessor
530 ModuleEntry* module_from = current_class->module();
531 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
532 const char * current_class_name = current_class->external_name();
533
534 // Find the module entry for new_class, the accessee
535 ModuleEntry* module_to = nullptr;
536 module_to = new_class->module();
537 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
538 const char * new_class_name = new_class->external_name();
539
540 if (result == MODULE_NOT_READABLE) {
541 assert(module_from->is_named(), "Unnamed modules can read all modules");
542 if (module_to->is_named()) {
543 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
544 strlen(new_class_name) + 2*strlen(module_to_name);
545 msg = NEW_RESOURCE_ARRAY(char, len);
546 jio_snprintf(msg, len - 1,
547 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
548 current_class_name, module_from_name, new_class_name,
549 module_to_name, module_from_name, module_to_name);
550 } else {
551 oop jlm = module_to->module();
552 assert(jlm != nullptr, "Null jlm in module_to ModuleEntry");
553 intptr_t identity_hash = jlm->identity_hash();
554 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
555 strlen(new_class_name) + 2*sizeof(uintx);
556 msg = NEW_RESOURCE_ARRAY(char, len);
557 jio_snprintf(msg, len - 1,
558 "class %s (in module %s) cannot access class %s (in unnamed module @0x%zx) because module %s does not read unnamed module @0x%zx",
559 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
560 module_from_name, uintx(identity_hash));
561 }
562
563 } else if (result == TYPE_NOT_EXPORTED) {
564 assert(new_class->package() != nullptr,
565 "Unnamed packages are always exported");
566 const char * package_name =
567 new_class->package()->name()->as_klass_external_name();
568 assert(module_to->is_named(), "Unnamed modules export all packages");
569 if (module_from->is_named()) {
570 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
571 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
572 msg = NEW_RESOURCE_ARRAY(char, len);
573 jio_snprintf(msg, len - 1,
574 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
575 current_class_name, module_from_name, new_class_name,
576 module_to_name, module_to_name, package_name, module_from_name);
577 } else {
578 oop jlm = module_from->module();
579 assert(jlm != nullptr, "Null jlm in module_from ModuleEntry");
580 intptr_t identity_hash = jlm->identity_hash();
581 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
582 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
583 msg = NEW_RESOURCE_ARRAY(char, len);
584 jio_snprintf(msg, len - 1,
585 "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",
586 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
587 module_to_name, package_name, uintx(identity_hash));
588 }
589 } else {
590 ShouldNotReachHere();
591 }
592 } // result != OTHER_PROBLEM...
593 return msg;
594 }
595
596 bool Reflection::verify_member_access(const Klass* current_class,
597 const Klass* resolved_class,
598 const Klass* member_class,
599 AccessFlags access,
600 bool classloader_only,
601 bool protected_restriction,
602 TRAPS) {
603 // Verify that current_class can access a member of member_class, where that
604 // field's access bits are "access". We assume that we've already verified
605 // that current_class can access member_class.
606 //
607 // If the classloader_only flag is set, we automatically allow any accesses
608 // in which current_class doesn't have a classloader.
609 //
610 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
611 // need this distinction (e.g. if all we have is the runtime type, or during
612 // class file parsing when we only care about the static type); in that case
613 // callers should ensure that resolved_class == member_class.
614 //
615 if ((current_class == nullptr) ||
616 (current_class == member_class) ||
617 access.is_public()) {
618 return true;
619 }
620
621 if (current_class == member_class) {
622 return true;
623 }
624
625 if (access.is_protected()) {
626 if (!protected_restriction) {
627 // See if current_class (or outermost host class) is a subclass of member_class
628 // An interface may not access protected members of j.l.Object
629 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
630 if (access.is_static() || // static fields are ok, see 6622385
631 current_class == resolved_class ||
632 member_class == resolved_class ||
633 current_class->is_subclass_of(resolved_class) ||
634 resolved_class->is_subclass_of(current_class)) {
635 return true;
636 }
637 }
638 }
639 }
640
641 // package access
642 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
643 return true;
644 }
645
646 // private access between different classes needs a nestmate check.
647 if (access.is_private()) {
648 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
649 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
650 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
651 // Nestmate access checks may require resolution and validation of the nest-host.
652 // It is up to the caller to check for pending exceptions and handle appropriately.
653 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
654 if (access) {
655 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
656 return true;
657 }
658 }
659 }
660
661 // Check for special relaxations
662 return can_relax_access_check_for(current_class, member_class, classloader_only);
663 }
664
665 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
666 return InstanceKlass::cast(class1)->is_same_class_package(class2);
667 }
668
669 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
670 // throw an incompatible class change exception
671 // If inner_is_member, require the inner to be a member of the outer.
672 // If !inner_is_member, require the inner to be hidden (non-member).
673 // Caller is responsible for figuring out in advance which case must be true.
674 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
675 bool inner_is_member, TRAPS) {
676 InnerClassesIterator iter(outer);
677 constantPoolHandle cp (THREAD, outer->constants());
678 for (; !iter.done(); iter.next()) {
679 int ioff = iter.inner_class_info_index();
680 int ooff = iter.outer_class_info_index();
681
682 if (inner_is_member && ioff != 0 && ooff != 0) {
683 if (cp->klass_name_at_matches(outer, ooff) &&
684 cp->klass_name_at_matches(inner, ioff)) {
685 Klass* o = cp->klass_at(ooff, CHECK);
686 if (o == outer) {
687 Klass* i = cp->klass_at(ioff, CHECK);
688 if (i == inner) {
689 return;
690 }
691 }
692 }
693 }
694
695 if (!inner_is_member && ioff != 0 && ooff == 0 &&
696 cp->klass_name_at_matches(inner, ioff)) {
697 Klass* i = cp->klass_at(ioff, CHECK);
698 if (i == inner) {
699 return;
700 }
701 }
702 }
703
704 // 'inner' not declared as an inner klass in outer
705 ResourceMark rm(THREAD);
706 // Names are all known to be < 64k so we know this formatted message is not excessively large.
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_method_flags();
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_method_flags();
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 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_field_flags());
873 java_lang_reflect_Field::set_override(rh(), false);
874 if (fd->has_generic_signature()) {
875 Symbol* gs = fd->generic_signature();
876 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
877 java_lang_reflect_Field::set_signature(rh(), sig());
878 }
879 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
880 java_lang_reflect_Field::set_annotations(rh(), an_oop);
881 return rh();
882 }
883
884 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
885 int flags, TRAPS) {
886
887 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
888
889 if(nullptr != sym) {
890 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
891 java_lang_reflect_Parameter::set_name(rh(), name());
892 } else {
893 java_lang_reflect_Parameter::set_name(rh(), nullptr);
894 }
895
896 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
897 java_lang_reflect_Parameter::set_executable(rh(), method());
898 java_lang_reflect_Parameter::set_index(rh(), index);
899 return rh();
900 }
901
902
903 static methodHandle resolve_interface_call(InstanceKlass* klass,
904 const methodHandle& method,
905 Klass* recv_klass,
906 Handle receiver,
907 TRAPS) {
908
909 assert(!method.is_null() , "method should not be null");
910
911 CallInfo info;
912 Symbol* signature = method->signature();
913 Symbol* name = method->name();
914 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
915 LinkInfo(klass, name, signature),
916 true,
917 CHECK_(methodHandle()));
918 return methodHandle(THREAD, info.selected_method());
919 }
920
921 // Conversion
922 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
923 assert(java_lang_Class::is_primitive(basic_type_mirror),
924 "just checking");
925 return java_lang_Class::primitive_type(basic_type_mirror);
926 }
927
928 // Narrowing of basic types. Used to create correct jvalues for
929 // boolean, byte, char and short return return values from interpreter
930 // which are returned as ints. Throws IllegalArgumentException.
931 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
932 switch (narrow_type) {
933 case T_BOOLEAN:
934 value->z = (jboolean) (value->i & 1);
935 return;
936 case T_BYTE:
937 value->b = (jbyte)value->i;
938 return;
939 case T_CHAR:
940 value->c = (jchar)value->i;
941 return;
942 case T_SHORT:
943 value->s = (jshort)value->i;
944 return;
945 default:
946 break; // fail
947 }
948 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
949 }
950
951
952 // Method call (shared by invoke_method and invoke_constructor)
953 static oop invoke(InstanceKlass* klass,
954 const methodHandle& reflected_method,
955 Handle receiver,
956 bool override,
957 objArrayHandle ptypes,
958 BasicType rtype,
959 objArrayHandle args,
960 bool is_method_invoke,
961 TRAPS) {
962
963 ResourceMark rm(THREAD);
964
965 methodHandle method; // actual method to invoke
966 Klass* target_klass; // target klass, receiver's klass for non-static
967
968 // Ensure klass is initialized
969 klass->initialize(CHECK_NULL);
970
971 bool is_static = reflected_method->is_static();
972 if (is_static) {
973 // ignore receiver argument
974 method = reflected_method;
975 target_klass = klass;
976 } else {
977 // check for null receiver
978 if (receiver.is_null()) {
979 THROW_NULL(vmSymbols::java_lang_NullPointerException());
980 }
981 // Check class of receiver against class declaring method
982 if (!receiver->is_a(klass)) {
983 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
984 }
985 // target klass is receiver's klass
986 target_klass = receiver->klass();
987 // no need to resolve if method is private or <init>
988 if (reflected_method->is_private() ||
989 reflected_method->name() == vmSymbols::object_initializer_name()) {
990 method = reflected_method;
991 } else {
992 // resolve based on the receiver
993 if (reflected_method->method_holder()->is_interface()) {
994 // resolve interface call
995 //
996 // Match resolution errors with those thrown due to reflection inlining
997 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
998 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
999 if (HAS_PENDING_EXCEPTION) {
1000 // Method resolution threw an exception; wrap it in an InvocationTargetException
1001 oop resolution_exception = PENDING_EXCEPTION;
1002 CLEAR_PENDING_EXCEPTION;
1003 // JVMTI has already reported the pending exception
1004 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1005 JvmtiExport::clear_detected_exception(THREAD);
1006 JavaCallArguments args(Handle(THREAD, resolution_exception));
1007 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1008 vmSymbols::throwable_void_signature(),
1009 &args);
1010 }
1011 } else {
1012 // if the method can be overridden, we resolve using the vtable index.
1013 assert(!reflected_method->has_itable_index(), "");
1014 int index = reflected_method->vtable_index();
1015 method = reflected_method;
1016 if (index != Method::nonvirtual_vtable_index) {
1017 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1018 }
1019 if (!method.is_null()) {
1020 // Check for abstract methods as well
1021 if (method->is_abstract()) {
1022 // new default: 6531596
1023 ResourceMark rm(THREAD);
1024 stringStream ss;
1025 ss.print("'");
1026 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1027 ss.print("'");
1028 Handle h_origexception = Exceptions::new_exception(THREAD,
1029 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1030 JavaCallArguments args(h_origexception);
1031 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1032 vmSymbols::throwable_void_signature(),
1033 &args);
1034 }
1035 }
1036 }
1037 }
1038 }
1039
1040 // I believe this is a ShouldNotGetHere case which requires
1041 // an internal vtable bug. If you ever get this please let Karen know.
1042 if (method.is_null()) {
1043 ResourceMark rm(THREAD);
1044 stringStream ss;
1045 ss.print("'");
1046 Method::print_external_name(&ss, klass,
1047 reflected_method->name(),
1048 reflected_method->signature());
1049 ss.print("'");
1050 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1051 }
1052
1053 assert(ptypes->is_objArray(), "just checking");
1054 int args_len = args.is_null() ? 0 : args->length();
1055 // Check number of arguments
1056 if (ptypes->length() != args_len) {
1057 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1058 "wrong number of arguments");
1059 }
1060
1061 // Create object to contain parameters for the JavaCall
1062 JavaCallArguments java_args(method->size_of_parameters());
1063
1064 if (!is_static) {
1065 java_args.push_oop(receiver);
1066 }
1067
1068 for (int i = 0; i < args_len; i++) {
1069 oop type_mirror = ptypes->obj_at(i);
1070 oop arg = args->obj_at(i);
1071 if (java_lang_Class::is_primitive(type_mirror)) {
1072 jvalue value;
1073 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1074 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1075 if (ptype != atype) {
1076 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1077 }
1078 switch (ptype) {
1079 case T_BOOLEAN: java_args.push_int(value.z); break;
1080 case T_CHAR: java_args.push_int(value.c); break;
1081 case T_BYTE: java_args.push_int(value.b); break;
1082 case T_SHORT: java_args.push_int(value.s); break;
1083 case T_INT: java_args.push_int(value.i); break;
1084 case T_LONG: java_args.push_long(value.j); break;
1085 case T_FLOAT: java_args.push_float(value.f); break;
1086 case T_DOUBLE: java_args.push_double(value.d); break;
1087 default:
1088 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1089 }
1090 } else {
1091 if (arg != nullptr) {
1092 Klass* k = java_lang_Class::as_Klass(type_mirror);
1093 if (!arg->is_a(k)) {
1094 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1095 "argument type mismatch");
1096 }
1097 }
1098 Handle arg_handle(THREAD, arg); // Create handle for argument
1099 java_args.push_oop(arg_handle); // Push handle
1100 }
1101 }
1102
1103 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1104 "just checking");
1105
1106 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1107 // oop (i.e., NOT as an handle)
1108 JavaValue result(rtype);
1109 JavaCalls::call(&result, method, &java_args, THREAD);
1110
1111 if (HAS_PENDING_EXCEPTION) {
1112 // Method threw an exception; wrap it in an InvocationTargetException
1113 oop target_exception = PENDING_EXCEPTION;
1114 CLEAR_PENDING_EXCEPTION;
1115 // JVMTI has already reported the pending exception
1116 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1117 JvmtiExport::clear_detected_exception(THREAD);
1118
1119 JavaCallArguments args(Handle(THREAD, target_exception));
1120 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1121 vmSymbols::throwable_void_signature(),
1122 &args);
1123 } else {
1124 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1125 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1126 }
1127 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1128 }
1129 }
1130
1131 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1132 // of java.lang.reflect.Constructor
1133
1134 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1135 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1136 int slot = java_lang_reflect_Method::slot(method_mirror);
1137 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1138 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1139
1140 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1141 BasicType rtype;
1142 if (java_lang_Class::is_primitive(return_type_mirror)) {
1143 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1144 } else {
1145 rtype = T_OBJECT;
1146 }
1147
1148 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1149 Method* m = klass->method_with_idnum(slot);
1150 if (m == nullptr) {
1151 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1152 }
1153 methodHandle method(THREAD, m);
1154
1155 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1156 }
1157
1158
1159 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1160 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1161 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1162 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1163 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1164
1165 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1166 Method* m = klass->method_with_idnum(slot);
1167 if (m == nullptr) {
1168 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1169 }
1170 methodHandle method(THREAD, m);
1171
1172 // Make sure klass gets initialize
1173 klass->initialize(CHECK_NULL);
1174
1175 // Create new instance (the receiver)
1176 klass->check_valid_for_instantiation(false, CHECK_NULL);
1177 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1178
1179 // Ignore result from call and return receiver
1180 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1181 return receiver();
1182 }