1 /*
2 * Copyright (c) 1997, 2023, 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/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
56 static void trace_class_resolution(oop mirror) {
57 if (mirror == nullptr || java_lang_Class::is_primitive(mirror)) {
58 return;
59 }
60 Klass* to_class = java_lang_Class::as_Klass(mirror);
61 ResourceMark rm;
62 int line_number = -1;
63 const char * source_file = nullptr;
64 Klass* caller = nullptr;
65 JavaThread* jthread = JavaThread::current();
66 if (jthread->has_last_Java_frame()) {
67 vframeStream vfst(jthread);
68 // skip over any frames belonging to java.lang.Class
69 while (!vfst.at_end() &&
70 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class()) {
71 vfst.next();
72 }
73 if (!vfst.at_end()) {
74 // this frame is a likely suspect
75 caller = vfst.method()->method_holder();
76 line_number = vfst.method()->line_number_from_bci(vfst.bci());
77 Symbol* s = vfst.method()->method_holder()->source_file_name();
78 if (s != nullptr) {
79 source_file = s->as_C_string();
80 }
81 }
82 }
83 if (caller != nullptr) {
84 const char * from = caller->external_name();
85 const char * to = to_class->external_name();
86 // print in a single call to reduce interleaving between threads
87 if (source_file != nullptr) {
88 log_debug(class, resolve)("%s %s %s:%d (reflection)", from, to, source_file, line_number);
89 } else {
90 log_debug(class, resolve)("%s %s (reflection)", from, to);
91 }
92 }
93 }
94
95
96 oop Reflection::box(jvalue* value, BasicType type, TRAPS) {
97 if (type == T_VOID) {
98 return nullptr;
99 }
100 if (is_reference_type(type)) {
101 // regular objects are not boxed
102 return cast_to_oop(value->l);
103 }
104 oop result = java_lang_boxing_object::create(type, value, CHECK_NULL);
105 if (result == nullptr) {
106 THROW_(vmSymbols::java_lang_IllegalArgumentException(), result);
107 }
108 return result;
109 }
110
111
112 BasicType Reflection::unbox_for_primitive(oop box, jvalue* value, TRAPS) {
113 if (box == nullptr) {
114 THROW_(vmSymbols::java_lang_IllegalArgumentException(), T_ILLEGAL);
115 }
116 return java_lang_boxing_object::get_value(box, value);
117 }
118
119 BasicType Reflection::unbox_for_regular_object(oop box, jvalue* value) {
120 // Note: box is really the unboxed oop. It might even be a Short, etc.!
121 value->l = cast_from_oop<jobject>(box);
122 return T_OBJECT;
123 }
124
125
126 void Reflection::widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS) {
127 assert(wide_type != current_type, "widen should not be called with identical types");
128 switch (wide_type) {
129 case T_BOOLEAN:
130 case T_BYTE:
131 case T_CHAR:
132 break; // fail
133 case T_SHORT:
134 switch (current_type) {
135 case T_BYTE:
136 value->s = (jshort) value->b;
137 return;
138 default:
139 break;
140 }
141 break; // fail
142 case T_INT:
143 switch (current_type) {
144 case T_BYTE:
145 value->i = (jint) value->b;
146 return;
147 case T_CHAR:
148 value->i = (jint) value->c;
149 return;
150 case T_SHORT:
151 value->i = (jint) value->s;
152 return;
153 default:
154 break;
155 }
156 break; // fail
157 case T_LONG:
158 switch (current_type) {
159 case T_BYTE:
160 value->j = (jlong) value->b;
161 return;
162 case T_CHAR:
163 value->j = (jlong) value->c;
164 return;
165 case T_SHORT:
166 value->j = (jlong) value->s;
167 return;
168 case T_INT:
169 value->j = (jlong) value->i;
170 return;
171 default:
172 break;
173 }
174 break; // fail
175 case T_FLOAT:
176 switch (current_type) {
177 case T_BYTE:
178 value->f = (jfloat) value->b;
179 return;
180 case T_CHAR:
181 value->f = (jfloat) value->c;
182 return;
183 case T_SHORT:
184 value->f = (jfloat) value->s;
185 return;
186 case T_INT:
187 value->f = (jfloat) value->i;
188 return;
189 case T_LONG:
190 value->f = (jfloat) value->j;
191 return;
192 default:
193 break;
194 }
195 break; // fail
196 case T_DOUBLE:
197 switch (current_type) {
198 case T_BYTE:
199 value->d = (jdouble) value->b;
200 return;
201 case T_CHAR:
202 value->d = (jdouble) value->c;
203 return;
204 case T_SHORT:
205 value->d = (jdouble) value->s;
206 return;
207 case T_INT:
208 value->d = (jdouble) value->i;
209 return;
210 case T_FLOAT:
211 value->d = (jdouble) value->f;
212 return;
213 case T_LONG:
214 value->d = (jdouble) value->j;
215 return;
216 default:
217 break;
218 }
219 break; // fail
220 default:
221 break; // fail
222 }
223 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
224 }
225
226
227 BasicType Reflection::array_get(jvalue* value, arrayOop a, int index, TRAPS) {
228 if (!a->is_within_bounds(index)) {
229 THROW_(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), T_ILLEGAL);
230 }
231 if (a->is_objArray()) {
232 value->l = cast_from_oop<jobject>(objArrayOop(a)->obj_at(index));
233 return T_OBJECT;
234 } else {
235 assert(a->is_typeArray(), "just checking");
236 BasicType type = TypeArrayKlass::cast(a->klass())->element_type();
237 switch (type) {
238 case T_BOOLEAN:
239 value->z = typeArrayOop(a)->bool_at(index);
240 break;
241 case T_CHAR:
242 value->c = typeArrayOop(a)->char_at(index);
243 break;
244 case T_FLOAT:
245 value->f = typeArrayOop(a)->float_at(index);
246 break;
247 case T_DOUBLE:
248 value->d = typeArrayOop(a)->double_at(index);
249 break;
250 case T_BYTE:
251 value->b = typeArrayOop(a)->byte_at(index);
252 break;
253 case T_SHORT:
254 value->s = typeArrayOop(a)->short_at(index);
255 break;
256 case T_INT:
257 value->i = typeArrayOop(a)->int_at(index);
258 break;
259 case T_LONG:
260 value->j = typeArrayOop(a)->long_at(index);
261 break;
262 default:
263 return T_ILLEGAL;
264 }
265 return type;
266 }
267 }
268
269
270 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) {
271 if (!a->is_within_bounds(index)) {
272 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
273 }
274 if (a->is_objArray()) {
275 if (value_type == T_OBJECT) {
276 oop obj = cast_to_oop(value->l);
277 if (obj != nullptr) {
278 Klass* element_klass = ObjArrayKlass::cast(a->klass())->element_klass();
279 if (!obj->is_a(element_klass)) {
280 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array element type mismatch");
281 }
282 }
283 objArrayOop(a)->obj_at_put(index, obj);
284 }
285 } else {
286 assert(a->is_typeArray(), "just checking");
287 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
288 if (array_type != value_type) {
289 // The widen operation can potentially throw an exception, but cannot block,
290 // so typeArrayOop a is safe if the call succeeds.
291 widen(value, value_type, array_type, CHECK);
292 }
293 switch (array_type) {
294 case T_BOOLEAN:
295 typeArrayOop(a)->bool_at_put(index, value->z);
296 break;
297 case T_CHAR:
298 typeArrayOop(a)->char_at_put(index, value->c);
299 break;
300 case T_FLOAT:
301 typeArrayOop(a)->float_at_put(index, value->f);
302 break;
303 case T_DOUBLE:
304 typeArrayOop(a)->double_at_put(index, value->d);
305 break;
306 case T_BYTE:
307 typeArrayOop(a)->byte_at_put(index, value->b);
308 break;
309 case T_SHORT:
310 typeArrayOop(a)->short_at_put(index, value->s);
311 break;
312 case T_INT:
313 typeArrayOop(a)->int_at_put(index, value->i);
314 break;
315 case T_LONG:
316 typeArrayOop(a)->long_at_put(index, value->j);
317 break;
318 default:
319 THROW(vmSymbols::java_lang_IllegalArgumentException());
320 }
321 }
322 }
323
324 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
325 assert(java_lang_Class::is_primitive(basic_type_mirror), "just checking");
326 BasicType type = java_lang_Class::primitive_type(basic_type_mirror);
327 if (type == T_VOID) {
328 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
329 }
330 else {
331 return Universe::typeArrayKlassObj(type);
332 }
333 }
334
335 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
336 if (element_mirror == nullptr) {
337 THROW_0(vmSymbols::java_lang_NullPointerException());
338 }
339 if (length < 0) {
340 THROW_MSG_0(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
341 }
342 if (java_lang_Class::is_primitive(element_mirror)) {
343 Klass* tak = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
344 return TypeArrayKlass::cast(tak)->allocate(length, THREAD);
345 } else {
346 Klass* k = java_lang_Class::as_Klass(element_mirror);
347 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
348 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
349 }
350 return oopFactory::new_objArray(k, length, THREAD);
351 }
352 }
353
354
355 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
356 assert(dim_array->is_typeArray(), "just checking");
357 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
358
359 if (element_mirror == nullptr) {
360 THROW_0(vmSymbols::java_lang_NullPointerException());
361 }
362
363 int len = dim_array->length();
364 if (len <= 0 || len > MAX_DIM) {
365 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
366 }
367
368 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
369 for (int i = 0; i < len; i++) {
370 int d = dim_array->int_at(i);
371 if (d < 0) {
372 THROW_MSG_0(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
373 }
374 dimensions[i] = d;
375 }
376
377 Klass* klass;
378 int dim = len;
379 if (java_lang_Class::is_primitive(element_mirror)) {
380 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
381 } else {
382 klass = java_lang_Class::as_Klass(element_mirror);
383 if (klass->is_array_klass()) {
384 int k_dim = ArrayKlass::cast(klass)->dimension();
385 if (k_dim + len > MAX_DIM) {
386 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
387 }
388 dim += k_dim;
389 }
390 }
391 klass = klass->array_klass(dim, CHECK_NULL);
392 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
393 assert(obj->is_array(), "just checking");
394 return arrayOop(obj);
395 }
396
397
398 static bool can_relax_access_check_for(const Klass* accessor,
399 const Klass* accessee,
400 bool classloader_only) {
401
402 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
403 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
404
405 if (RelaxAccessControlCheck &&
406 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
407 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
408 return classloader_only &&
409 Verifier::relax_access_for(accessor_ik->class_loader()) &&
410 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
411 accessor_ik->class_loader() == accessee_ik->class_loader();
412 }
413
414 return false;
415 }
416
417 /*
418 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
419
420 Callee T in Callee T in package PT,
421 unnamed module runtime module MT
422 ------------------------------------------------------------------------------------------------
423
424 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
425 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
426 unnamed module: YES
427 Else if (MS can read MT (establish readability) &&
428 ((MT exports PT to MS or to all modules) ||
429 (MT is open))): YES
430
431 ------------------------------------------------------------------------------------------------
432 Caller S in unnamed YES Readability exists because unnamed module
433 module UM "reads" all modules
434 if (MT exports PT to UM or to all modules): YES
435
436 ------------------------------------------------------------------------------------------------
437
438 Note: a loose module is a module that can read all current and future unnamed modules.
439 */
440 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
441 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
442
443 // Verify that current_class can access new_class. If the classloader_only
444 // flag is set, we automatically allow any accesses in which current_class
445 // doesn't have a classloader.
446 if ((current_class == nullptr) ||
447 (current_class == new_class) ||
448 is_same_class_package(current_class, new_class)) {
449 return ACCESS_OK;
450 }
451 // Allow all accesses from jdk/internal/reflect/SerializationConstructorAccessorImpl subclasses to
452 // succeed trivially.
453 if (vmClasses::reflect_SerializationConstructorAccessorImpl_klass_is_loaded() &&
454 current_class->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
455 return ACCESS_OK;
456 }
457
458 // module boundaries
459 if (new_class->is_public()) {
460 // Ignore modules for -Xshare:dump because we do not have any package
461 // or module information for modules other than java.base.
462 if (CDSConfig::is_dumping_static_archive()) {
463 return ACCESS_OK;
464 }
465
466 // Find the module entry for current_class, the accessor
467 ModuleEntry* module_from = current_class->module();
468 // Find the module entry for new_class, the accessee
469 ModuleEntry* module_to = new_class->module();
470
471 // both in same (possibly unnamed) module
472 if (module_from == module_to) {
473 return ACCESS_OK;
474 }
475
476 // Acceptable access to a type in an unnamed module. Note that since
477 // unnamed modules can read all unnamed modules, this also handles the
478 // case where module_from is also unnamed but in a different class loader.
479 if (!module_to->is_named() &&
480 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
481 return ACCESS_OK;
482 }
483
484 // Establish readability, check if module_from is allowed to read module_to.
485 if (!module_from->can_read(module_to)) {
486 return MODULE_NOT_READABLE;
487 }
488
489 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
490 if (module_to->is_open()) {
491 return ACCESS_OK;
492 }
493
494 PackageEntry* package_to = new_class->package();
495 assert(package_to != nullptr, "can not obtain new_class' package");
496
497 {
498 MutexLocker m1(Module_lock);
499
500 // Once readability is established, if module_to exports T unqualifiedly,
501 // (to all modules), than whether module_from is in the unnamed module
502 // or not does not matter, access is allowed.
503 if (package_to->is_unqual_exported()) {
504 return ACCESS_OK;
505 }
506
507 // Access is allowed if both 1 & 2 hold:
508 // 1. Readability, module_from can read module_to (established above).
509 // 2. Either module_to exports T to module_from qualifiedly.
510 // or
511 // module_to exports T to all unnamed modules and module_from is unnamed.
512 // or
513 // module_to exports T unqualifiedly to all modules (checked above).
514 if (!package_to->is_qexported_to(module_from)) {
515 return TYPE_NOT_EXPORTED;
516 }
517 }
518 return ACCESS_OK;
519 }
520
521 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
522 return ACCESS_OK;
523 }
524 return OTHER_PROBLEM;
525 }
526
527 // Return an error message specific to the specified Klass*'s and result.
528 // This function must be called from within a block containing a ResourceMark.
529 char* Reflection::verify_class_access_msg(const Klass* current_class,
530 const InstanceKlass* new_class,
531 const VerifyClassAccessResults result) {
532 assert(result != ACCESS_OK, "must be failure result");
533 char * msg = nullptr;
534 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
535 // Find the module entry for current_class, the accessor
536 ModuleEntry* module_from = current_class->module();
537 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
538 const char * current_class_name = current_class->external_name();
539
540 // Find the module entry for new_class, the accessee
541 ModuleEntry* module_to = nullptr;
542 module_to = new_class->module();
543 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
544 const char * new_class_name = new_class->external_name();
545
546 if (result == MODULE_NOT_READABLE) {
547 assert(module_from->is_named(), "Unnamed modules can read all modules");
548 if (module_to->is_named()) {
549 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
550 strlen(new_class_name) + 2*strlen(module_to_name);
551 msg = NEW_RESOURCE_ARRAY(char, len);
552 jio_snprintf(msg, len - 1,
553 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
554 current_class_name, module_from_name, new_class_name,
555 module_to_name, module_from_name, module_to_name);
556 } else {
557 oop jlm = module_to->module();
558 assert(jlm != nullptr, "Null jlm in module_to ModuleEntry");
559 intptr_t identity_hash = jlm->identity_hash();
560 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
561 strlen(new_class_name) + 2*sizeof(uintx);
562 msg = NEW_RESOURCE_ARRAY(char, len);
563 jio_snprintf(msg, len - 1,
564 "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,
565 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
566 module_from_name, uintx(identity_hash));
567 }
568
569 } else if (result == TYPE_NOT_EXPORTED) {
570 assert(new_class->package() != nullptr,
571 "Unnamed packages are always exported");
572 const char * package_name =
573 new_class->package()->name()->as_klass_external_name();
574 assert(module_to->is_named(), "Unnamed modules export all packages");
575 if (module_from->is_named()) {
576 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
577 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
578 msg = NEW_RESOURCE_ARRAY(char, len);
579 jio_snprintf(msg, len - 1,
580 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
581 current_class_name, module_from_name, new_class_name,
582 module_to_name, module_to_name, package_name, module_from_name);
583 } else {
584 oop jlm = module_from->module();
585 assert(jlm != nullptr, "Null jlm in module_from ModuleEntry");
586 intptr_t identity_hash = jlm->identity_hash();
587 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
588 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
589 msg = NEW_RESOURCE_ARRAY(char, len);
590 jio_snprintf(msg, len - 1,
591 "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,
592 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
593 module_to_name, package_name, uintx(identity_hash));
594 }
595 } else {
596 ShouldNotReachHere();
597 }
598 } // result != OTHER_PROBLEM...
599 return msg;
600 }
601
602 bool Reflection::verify_member_access(const Klass* current_class,
603 const Klass* resolved_class,
604 const Klass* member_class,
605 AccessFlags access,
606 bool classloader_only,
607 bool protected_restriction,
608 TRAPS) {
609 // Verify that current_class can access a member of member_class, where that
610 // field's access bits are "access". We assume that we've already verified
611 // that current_class can access member_class.
612 //
613 // If the classloader_only flag is set, we automatically allow any accesses
614 // in which current_class doesn't have a classloader.
615 //
616 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
617 // need this distinction (e.g. if all we have is the runtime type, or during
618 // class file parsing when we only care about the static type); in that case
619 // callers should ensure that resolved_class == member_class.
620 //
621 if ((current_class == nullptr) ||
622 (current_class == member_class) ||
623 access.is_public()) {
624 return true;
625 }
626
627 if (current_class == member_class) {
628 return true;
629 }
630
631 if (access.is_protected()) {
632 if (!protected_restriction) {
633 // See if current_class (or outermost host class) is a subclass of member_class
634 // An interface may not access protected members of j.l.Object
635 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
636 if (access.is_static() || // static fields are ok, see 6622385
637 current_class == resolved_class ||
638 member_class == resolved_class ||
639 current_class->is_subclass_of(resolved_class) ||
640 resolved_class->is_subclass_of(current_class)) {
641 return true;
642 }
643 }
644 }
645 }
646
647 // package access
648 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
649 return true;
650 }
651
652 // private access between different classes needs a nestmate check.
653 if (access.is_private()) {
654 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
655 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
656 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
657 // Nestmate access checks may require resolution and validation of the nest-host.
658 // It is up to the caller to check for pending exceptions and handle appropriately.
659 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
660 if (access) {
661 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
662 return true;
663 }
664 }
665 }
666
667 // Allow all accesses from jdk/internal/reflect/SerializationConstructorAccessorImpl subclasses to
668 // succeed trivially.
669 if (current_class->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
670 return true;
671 }
672
673 // Check for special relaxations
674 return can_relax_access_check_for(current_class, member_class, classloader_only);
675 }
676
677 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
678 return InstanceKlass::cast(class1)->is_same_class_package(class2);
679 }
680
681 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
682 // throw an incompatible class change exception
683 // If inner_is_member, require the inner to be a member of the outer.
684 // If !inner_is_member, require the inner to be hidden (non-member).
685 // Caller is responsible for figuring out in advance which case must be true.
686 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
687 bool inner_is_member, TRAPS) {
688 InnerClassesIterator iter(outer);
689 constantPoolHandle cp (THREAD, outer->constants());
690 for (; !iter.done(); iter.next()) {
691 int ioff = iter.inner_class_info_index();
692 int ooff = iter.outer_class_info_index();
693
694 if (inner_is_member && ioff != 0 && ooff != 0) {
695 if (cp->klass_name_at_matches(outer, ooff) &&
696 cp->klass_name_at_matches(inner, ioff)) {
697 Klass* o = cp->klass_at(ooff, CHECK);
698 if (o == outer) {
699 Klass* i = cp->klass_at(ioff, CHECK);
700 if (i == inner) {
701 return;
702 }
703 }
704 }
705 }
706
707 if (!inner_is_member && ioff != 0 && ooff == 0 &&
708 cp->klass_name_at_matches(inner, ioff)) {
709 Klass* i = cp->klass_at(ioff, CHECK);
710 if (i == inner) {
711 return;
712 }
713 }
714 }
715
716 // 'inner' not declared as an inner klass in outer
717 ResourceMark rm(THREAD);
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 if (log_is_enabled(Debug, class, resolve)) {
769 trace_class_resolution(nt);
770 }
771 return Handle(THREAD, nt);
772 }
773
774 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
775 // Allow sun.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
776 assert(!method()->is_initializer() ||
777 (for_constant_pool_access && method()->is_static()),
778 "should call new_constructor instead");
779 InstanceKlass* holder = method->method_holder();
780 int slot = method->method_idnum();
781
782 Symbol* signature = method->signature();
783 int parameter_count = ArgumentCount(signature).size();
784 oop return_type_oop = nullptr;
785 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
786 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
787
788 Handle return_type(THREAD, return_type_oop);
789
790 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
791 assert(!exception_types.is_null(), "cannot return null");
792
793 Symbol* method_name = method->name();
794 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
795 Handle name = Handle(THREAD, name_oop);
796 if (name == nullptr) return nullptr;
797
798 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
799
800 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
801
802 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
803 java_lang_reflect_Method::set_slot(mh(), slot);
804 java_lang_reflect_Method::set_name(mh(), name());
805 java_lang_reflect_Method::set_return_type(mh(), return_type());
806 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
807 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
808 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
809 java_lang_reflect_Method::set_override(mh(), false);
810 if (method->generic_signature() != nullptr) {
811 Symbol* gs = method->generic_signature();
812 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
813 java_lang_reflect_Method::set_signature(mh(), sig());
814 }
815 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
816 java_lang_reflect_Method::set_annotations(mh(), an_oop);
817 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
818 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
819 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
820 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
821 return mh();
822 }
823
824
825 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
826 assert(method()->is_initializer(), "should call new_method instead");
827
828 InstanceKlass* holder = method->method_holder();
829 int slot = method->method_idnum();
830
831 Symbol* signature = method->signature();
832 int parameter_count = ArgumentCount(signature).size();
833 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
834 if (parameter_types.is_null()) return nullptr;
835
836 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
837 assert(!exception_types.is_null(), "cannot return null");
838
839 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
840
841 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
842
843 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
844 java_lang_reflect_Constructor::set_slot(ch(), slot);
845 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
846 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
847 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
848 java_lang_reflect_Constructor::set_override(ch(), false);
849 if (method->generic_signature() != nullptr) {
850 Symbol* gs = method->generic_signature();
851 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
852 java_lang_reflect_Constructor::set_signature(ch(), sig());
853 }
854 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
855 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
856 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
857 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
858 return ch();
859 }
860
861
862 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
863 Symbol* field_name = fd->name();
864 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
865 Handle name = Handle(THREAD, name_oop);
866 Symbol* signature = fd->signature();
867 InstanceKlass* holder = fd->field_holder();
868 Handle type = new_type(signature, holder, CHECK_NULL);
869 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
870
871 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
872 java_lang_reflect_Field::set_slot(rh(), fd->index());
873 java_lang_reflect_Field::set_name(rh(), name());
874 java_lang_reflect_Field::set_type(rh(), type());
875 if (fd->is_trusted_final()) {
876 java_lang_reflect_Field::set_trusted_final(rh());
877 }
878 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
879 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
880 java_lang_reflect_Field::set_override(rh(), false);
881 if (fd->has_generic_signature()) {
882 Symbol* gs = fd->generic_signature();
883 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
884 java_lang_reflect_Field::set_signature(rh(), sig());
885 }
886 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
887 java_lang_reflect_Field::set_annotations(rh(), an_oop);
888 return rh();
889 }
890
891 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
892 int flags, TRAPS) {
893
894 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
895
896 if(nullptr != sym) {
897 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
898 java_lang_reflect_Parameter::set_name(rh(), name());
899 } else {
900 java_lang_reflect_Parameter::set_name(rh(), nullptr);
901 }
902
903 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
904 java_lang_reflect_Parameter::set_executable(rh(), method());
905 java_lang_reflect_Parameter::set_index(rh(), index);
906 return rh();
907 }
908
909
910 static methodHandle resolve_interface_call(InstanceKlass* klass,
911 const methodHandle& method,
912 Klass* recv_klass,
913 Handle receiver,
914 TRAPS) {
915
916 assert(!method.is_null() , "method should not be null");
917
918 CallInfo info;
919 Symbol* signature = method->signature();
920 Symbol* name = method->name();
921 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
922 LinkInfo(klass, name, signature),
923 true,
924 CHECK_(methodHandle()));
925 return methodHandle(THREAD, info.selected_method());
926 }
927
928 // Conversion
929 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
930 assert(java_lang_Class::is_primitive(basic_type_mirror),
931 "just checking");
932 return java_lang_Class::primitive_type(basic_type_mirror);
933 }
934
935 // Narrowing of basic types. Used to create correct jvalues for
936 // boolean, byte, char and short return return values from interpreter
937 // which are returned as ints. Throws IllegalArgumentException.
938 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
939 switch (narrow_type) {
940 case T_BOOLEAN:
941 value->z = (jboolean) (value->i & 1);
942 return;
943 case T_BYTE:
944 value->b = (jbyte)value->i;
945 return;
946 case T_CHAR:
947 value->c = (jchar)value->i;
948 return;
949 case T_SHORT:
950 value->s = (jshort)value->i;
951 return;
952 default:
953 break; // fail
954 }
955 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
956 }
957
958
959 // Method call (shared by invoke_method and invoke_constructor)
960 static oop invoke(InstanceKlass* klass,
961 const methodHandle& reflected_method,
962 Handle receiver,
963 bool override,
964 objArrayHandle ptypes,
965 BasicType rtype,
966 objArrayHandle args,
967 bool is_method_invoke,
968 TRAPS) {
969
970 ResourceMark rm(THREAD);
971
972 methodHandle method; // actual method to invoke
973 Klass* target_klass; // target klass, receiver's klass for non-static
974
975 // Ensure klass is initialized
976 klass->initialize(CHECK_NULL);
977
978 bool is_static = reflected_method->is_static();
979 if (is_static) {
980 // ignore receiver argument
981 method = reflected_method;
982 target_klass = klass;
983 } else {
984 // check for null receiver
985 if (receiver.is_null()) {
986 THROW_0(vmSymbols::java_lang_NullPointerException());
987 }
988 // Check class of receiver against class declaring method
989 if (!receiver->is_a(klass)) {
990 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
991 }
992 // target klass is receiver's klass
993 target_klass = receiver->klass();
994 // no need to resolve if method is private or <init>
995 if (reflected_method->is_private() || reflected_method->name() == vmSymbols::object_initializer_name()) {
996 method = reflected_method;
997 } else {
998 // resolve based on the receiver
999 if (reflected_method->method_holder()->is_interface()) {
1000 // resolve interface call
1001 //
1002 // Match resolution errors with those thrown due to reflection inlining
1003 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
1004 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
1005 if (HAS_PENDING_EXCEPTION) {
1006 // Method resolution threw an exception; wrap it in an InvocationTargetException
1007 oop resolution_exception = PENDING_EXCEPTION;
1008 CLEAR_PENDING_EXCEPTION;
1009 // JVMTI has already reported the pending exception
1010 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1011 JvmtiExport::clear_detected_exception(THREAD);
1012 JavaCallArguments args(Handle(THREAD, resolution_exception));
1013 THROW_ARG_0(vmSymbols::java_lang_reflect_InvocationTargetException(),
1014 vmSymbols::throwable_void_signature(),
1015 &args);
1016 }
1017 } else {
1018 // if the method can be overridden, we resolve using the vtable index.
1019 assert(!reflected_method->has_itable_index(), "");
1020 int index = reflected_method->vtable_index();
1021 method = reflected_method;
1022 if (index != Method::nonvirtual_vtable_index) {
1023 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1024 }
1025 if (!method.is_null()) {
1026 // Check for abstract methods as well
1027 if (method->is_abstract()) {
1028 // new default: 6531596
1029 ResourceMark rm(THREAD);
1030 stringStream ss;
1031 ss.print("'");
1032 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1033 ss.print("'");
1034 Handle h_origexception = Exceptions::new_exception(THREAD,
1035 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1036 JavaCallArguments args(h_origexception);
1037 THROW_ARG_0(vmSymbols::java_lang_reflect_InvocationTargetException(),
1038 vmSymbols::throwable_void_signature(),
1039 &args);
1040 }
1041 }
1042 }
1043 }
1044 }
1045
1046 // I believe this is a ShouldNotGetHere case which requires
1047 // an internal vtable bug. If you ever get this please let Karen know.
1048 if (method.is_null()) {
1049 ResourceMark rm(THREAD);
1050 stringStream ss;
1051 ss.print("'");
1052 Method::print_external_name(&ss, klass,
1053 reflected_method->name(),
1054 reflected_method->signature());
1055 ss.print("'");
1056 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1057 }
1058
1059 assert(ptypes->is_objArray(), "just checking");
1060 int args_len = args.is_null() ? 0 : args->length();
1061 // Check number of arguments
1062 if (ptypes->length() != args_len) {
1063 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1064 "wrong number of arguments");
1065 }
1066
1067 // Create object to contain parameters for the JavaCall
1068 JavaCallArguments java_args(method->size_of_parameters());
1069
1070 if (!is_static) {
1071 java_args.push_oop(receiver);
1072 }
1073
1074 for (int i = 0; i < args_len; i++) {
1075 oop type_mirror = ptypes->obj_at(i);
1076 oop arg = args->obj_at(i);
1077 if (java_lang_Class::is_primitive(type_mirror)) {
1078 jvalue value;
1079 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1080 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1081 if (ptype != atype) {
1082 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1083 }
1084 switch (ptype) {
1085 case T_BOOLEAN: java_args.push_int(value.z); break;
1086 case T_CHAR: java_args.push_int(value.c); break;
1087 case T_BYTE: java_args.push_int(value.b); break;
1088 case T_SHORT: java_args.push_int(value.s); break;
1089 case T_INT: java_args.push_int(value.i); break;
1090 case T_LONG: java_args.push_long(value.j); break;
1091 case T_FLOAT: java_args.push_float(value.f); break;
1092 case T_DOUBLE: java_args.push_double(value.d); break;
1093 default:
1094 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1095 }
1096 } else {
1097 if (arg != nullptr) {
1098 Klass* k = java_lang_Class::as_Klass(type_mirror);
1099 if (!arg->is_a(k)) {
1100 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1101 "argument type mismatch");
1102 }
1103 }
1104 Handle arg_handle(THREAD, arg); // Create handle for argument
1105 java_args.push_oop(arg_handle); // Push handle
1106 }
1107 }
1108
1109 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1110 "just checking");
1111
1112 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1113 // oop (i.e., NOT as an handle)
1114 JavaValue result(rtype);
1115 JavaCalls::call(&result, method, &java_args, THREAD);
1116
1117 if (HAS_PENDING_EXCEPTION) {
1118 // Method threw an exception; wrap it in an InvocationTargetException
1119 oop target_exception = PENDING_EXCEPTION;
1120 CLEAR_PENDING_EXCEPTION;
1121 // JVMTI has already reported the pending exception
1122 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1123 JvmtiExport::clear_detected_exception(THREAD);
1124
1125 JavaCallArguments args(Handle(THREAD, target_exception));
1126 THROW_ARG_0(vmSymbols::java_lang_reflect_InvocationTargetException(),
1127 vmSymbols::throwable_void_signature(),
1128 &args);
1129 } else {
1130 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1131 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1132 }
1133 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1134 }
1135 }
1136
1137 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1138 // of java.lang.reflect.Constructor
1139
1140 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1141 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1142 int slot = java_lang_reflect_Method::slot(method_mirror);
1143 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1144 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1145
1146 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1147 BasicType rtype;
1148 if (java_lang_Class::is_primitive(return_type_mirror)) {
1149 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1150 } else {
1151 rtype = T_OBJECT;
1152 }
1153
1154 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1155 Method* m = klass->method_with_idnum(slot);
1156 if (m == nullptr) {
1157 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "invoke");
1158 }
1159 methodHandle method(THREAD, m);
1160
1161 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1162 }
1163
1164
1165 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1166 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1167 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1168 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1169 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1170
1171 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1172 Method* m = klass->method_with_idnum(slot);
1173 if (m == nullptr) {
1174 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "invoke");
1175 }
1176 methodHandle method(THREAD, m);
1177 assert(method->name() == vmSymbols::object_initializer_name(), "invalid constructor");
1178
1179 // Make sure klass gets initialize
1180 klass->initialize(CHECK_NULL);
1181
1182 // Create new instance (the receiver)
1183 klass->check_valid_for_instantiation(false, CHECK_NULL);
1184 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1185
1186 // Ignore result from call and return receiver
1187 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1188 return receiver();
1189 }