1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/packageEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/verifier.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "jvm.h"
36 #include "logging/log.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "memory/universe.hpp"
40 #include "oops/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_NULL(vmSymbols::java_lang_IllegalArgumentException());
329 }
330 else {
331 return Universe::typeArrayKlass(type);
332 }
333 }
334
335 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
336 if (element_mirror == nullptr) {
337 THROW_NULL(vmSymbols::java_lang_NullPointerException());
338 }
339 if (length < 0) {
340 THROW_MSG_NULL(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_NULL(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_NULL(vmSymbols::java_lang_NullPointerException());
361 }
362
363 int len = dim_array->length();
364 if (len <= 0 || len > MAX_DIM) {
365 THROW_NULL(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_NULL(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_NULL(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 // 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 @" SIZE_FORMAT_X ") because module %s does not read unnamed module @" SIZE_FORMAT_X,
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 @" SIZE_FORMAT_X ") cannot access class %s (in module %s) because module %s does not export %s to unnamed module @" SIZE_FORMAT_X,
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 // Allow all accesses from jdk/internal/reflect/SerializationConstructorAccessorImpl subclasses to
662 // succeed trivially.
663 if (current_class->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
664 return true;
665 }
666
667 // Check for special relaxations
668 return can_relax_access_check_for(current_class, member_class, classloader_only);
669 }
670
671 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
672 return InstanceKlass::cast(class1)->is_same_class_package(class2);
673 }
674
675 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
676 // throw an incompatible class change exception
677 // If inner_is_member, require the inner to be a member of the outer.
678 // If !inner_is_member, require the inner to be hidden (non-member).
679 // Caller is responsible for figuring out in advance which case must be true.
680 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
681 bool inner_is_member, TRAPS) {
682 InnerClassesIterator iter(outer);
683 constantPoolHandle cp (THREAD, outer->constants());
684 for (; !iter.done(); iter.next()) {
685 int ioff = iter.inner_class_info_index();
686 int ooff = iter.outer_class_info_index();
687
688 if (inner_is_member && ioff != 0 && ooff != 0) {
689 if (cp->klass_name_at_matches(outer, ooff) &&
690 cp->klass_name_at_matches(inner, ioff)) {
691 Klass* o = cp->klass_at(ooff, CHECK);
692 if (o == outer) {
693 Klass* i = cp->klass_at(ioff, CHECK);
694 if (i == inner) {
695 return;
696 }
697 }
698 }
699 }
700
701 if (!inner_is_member && ioff != 0 && ooff == 0 &&
702 cp->klass_name_at_matches(inner, ioff)) {
703 Klass* i = cp->klass_at(ioff, CHECK);
704 if (i == inner) {
705 return;
706 }
707 }
708 }
709
710 // 'inner' not declared as an inner klass in outer
711 ResourceMark rm(THREAD);
712 Exceptions::fthrow(
713 THREAD_AND_LOCATION,
714 vmSymbols::java_lang_IncompatibleClassChangeError(),
715 "%s and %s disagree on InnerClasses attribute",
716 outer->external_name(),
717 inner->external_name()
718 );
719 }
720
721 static objArrayHandle get_parameter_types(const methodHandle& method,
722 int parameter_count,
723 oop* return_type,
724 TRAPS) {
725 objArrayOop m;
726 if (parameter_count == 0) {
727 // Avoid allocating an array for the empty case
728 // Still need to parse the signature for the return type below
729 m = Universe::the_empty_class_array();
730 } else {
731 // Allocate array holding parameter types (java.lang.Class instances)
732 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
733 }
734 objArrayHandle mirrors(THREAD, m);
735 int index = 0;
736 // Collect parameter types
737 ResourceMark rm(THREAD);
738 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) {
739 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle()));
740 if (log_is_enabled(Debug, class, resolve)) {
741 trace_class_resolution(mirror);
742 }
743 if (!ss.at_return_type()) {
744 mirrors->obj_at_put(index++, mirror);
745 } else if (return_type != nullptr) {
746 // Collect return type as well
747 assert(ss.at_return_type(), "return type should be present");
748 *return_type = mirror;
749 }
750 }
751 assert(index == parameter_count, "invalid parameter count");
752 return mirrors;
753 }
754
755 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) {
756 return method->resolved_checked_exceptions(THREAD);
757 }
758
759 static Handle new_type(Symbol* signature, Klass* k, TRAPS) {
760 ResolvingSignatureStream ss(signature, k, false);
761 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH);
762 if (log_is_enabled(Debug, class, resolve)) {
763 trace_class_resolution(nt);
764 }
765 return Handle(THREAD, nt);
766 }
767
768 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
769 // Allow jdk.internal.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
770 assert(!method()->is_object_initializer() &&
771 (for_constant_pool_access || !method()->is_static_initializer()),
772 "Should not be the initializer");
773 InstanceKlass* holder = method->method_holder();
774 int slot = method->method_idnum();
775
776 Symbol* signature = method->signature();
777 int parameter_count = ArgumentCount(signature).size();
778 oop return_type_oop = nullptr;
779 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
780 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
781
782 Handle return_type(THREAD, return_type_oop);
783
784 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
785 assert(!exception_types.is_null(), "cannot return null");
786
787 Symbol* method_name = method->name();
788 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
789 Handle name = Handle(THREAD, name_oop);
790 if (name == nullptr) return nullptr;
791
792 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
793
794 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
795
796 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
797 java_lang_reflect_Method::set_slot(mh(), slot);
798 java_lang_reflect_Method::set_name(mh(), name());
799 java_lang_reflect_Method::set_return_type(mh(), return_type());
800 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
801 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
802 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
803 java_lang_reflect_Method::set_override(mh(), false);
804 if (method->generic_signature() != nullptr) {
805 Symbol* gs = method->generic_signature();
806 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
807 java_lang_reflect_Method::set_signature(mh(), sig());
808 }
809 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
810 java_lang_reflect_Method::set_annotations(mh(), an_oop);
811 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
812 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
813 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
814 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
815 return mh();
816 }
817
818
819 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
820 assert(method()->is_object_initializer(), "Should be the initializer");
821
822 InstanceKlass* holder = method->method_holder();
823 int slot = method->method_idnum();
824
825 Symbol* signature = method->signature();
826 int parameter_count = ArgumentCount(signature).size();
827 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
828 if (parameter_types.is_null()) return nullptr;
829
830 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
831 assert(!exception_types.is_null(), "cannot return null");
832
833 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
834
835 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
836
837 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
838 java_lang_reflect_Constructor::set_slot(ch(), slot);
839 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
840 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
841 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
842 java_lang_reflect_Constructor::set_override(ch(), false);
843 if (method->generic_signature() != nullptr) {
844 Symbol* gs = method->generic_signature();
845 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
846 java_lang_reflect_Constructor::set_signature(ch(), sig());
847 }
848 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
849 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
850 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
851 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
852 return ch();
853 }
854
855
856 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
857 Symbol* field_name = fd->name();
858 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
859 Handle name = Handle(THREAD, name_oop);
860 Symbol* signature = fd->signature();
861 InstanceKlass* holder = fd->field_holder();
862 Handle type = new_type(signature, holder, CHECK_NULL);
863 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
864
865 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
866 java_lang_reflect_Field::set_slot(rh(), fd->index());
867 java_lang_reflect_Field::set_name(rh(), name());
868 java_lang_reflect_Field::set_type(rh(), type());
869 if (fd->is_trusted_final()) {
870 java_lang_reflect_Field::set_trusted_final(rh());
871 }
872 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
873 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);
874 java_lang_reflect_Field::set_override(rh(), false);
875 if (fd->has_generic_signature()) {
876 Symbol* gs = fd->generic_signature();
877 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
878 java_lang_reflect_Field::set_signature(rh(), sig());
879 }
880 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
881 java_lang_reflect_Field::set_annotations(rh(), an_oop);
882 return rh();
883 }
884
885 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
886 int flags, TRAPS) {
887
888 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
889
890 if(nullptr != sym) {
891 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
892 java_lang_reflect_Parameter::set_name(rh(), name());
893 } else {
894 java_lang_reflect_Parameter::set_name(rh(), nullptr);
895 }
896
897 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
898 java_lang_reflect_Parameter::set_executable(rh(), method());
899 java_lang_reflect_Parameter::set_index(rh(), index);
900 return rh();
901 }
902
903
904 static methodHandle resolve_interface_call(InstanceKlass* klass,
905 const methodHandle& method,
906 Klass* recv_klass,
907 Handle receiver,
908 TRAPS) {
909
910 assert(!method.is_null() , "method should not be null");
911
912 CallInfo info;
913 Symbol* signature = method->signature();
914 Symbol* name = method->name();
915 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
916 LinkInfo(klass, name, signature),
917 true,
918 CHECK_(methodHandle()));
919 return methodHandle(THREAD, info.selected_method());
920 }
921
922 // Conversion
923 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
924 assert(java_lang_Class::is_primitive(basic_type_mirror),
925 "just checking");
926 return java_lang_Class::primitive_type(basic_type_mirror);
927 }
928
929 // Narrowing of basic types. Used to create correct jvalues for
930 // boolean, byte, char and short return return values from interpreter
931 // which are returned as ints. Throws IllegalArgumentException.
932 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
933 switch (narrow_type) {
934 case T_BOOLEAN:
935 value->z = (jboolean) (value->i & 1);
936 return;
937 case T_BYTE:
938 value->b = (jbyte)value->i;
939 return;
940 case T_CHAR:
941 value->c = (jchar)value->i;
942 return;
943 case T_SHORT:
944 value->s = (jshort)value->i;
945 return;
946 default:
947 break; // fail
948 }
949 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
950 }
951
952
953 // Method call (shared by invoke_method and invoke_constructor)
954 static oop invoke(InstanceKlass* klass,
955 const methodHandle& reflected_method,
956 Handle receiver,
957 bool override,
958 objArrayHandle ptypes,
959 BasicType rtype,
960 objArrayHandle args,
961 bool is_method_invoke,
962 TRAPS) {
963
964 ResourceMark rm(THREAD);
965
966 methodHandle method; // actual method to invoke
967 Klass* target_klass; // target klass, receiver's klass for non-static
968
969 // Ensure klass is initialized
970 klass->initialize(CHECK_NULL);
971
972 bool is_static = reflected_method->is_static();
973 if (is_static) {
974 // ignore receiver argument
975 method = reflected_method;
976 target_klass = klass;
977 } else {
978 // check for null receiver
979 if (receiver.is_null()) {
980 THROW_NULL(vmSymbols::java_lang_NullPointerException());
981 }
982 // Check class of receiver against class declaring method
983 if (!receiver->is_a(klass)) {
984 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
985 }
986 // target klass is receiver's klass
987 target_klass = receiver->klass();
988 // no need to resolve if method is private or <init>
989 if (reflected_method->is_private() || 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 assert(method->name() == vmSymbols::object_initializer_name(), "invalid constructor");
1172
1173 // Make sure klass gets initialize
1174 klass->initialize(CHECK_NULL);
1175
1176 // Create new instance (the receiver)
1177 klass->check_valid_for_instantiation(false, CHECK_NULL);
1178 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1179
1180 // Ignore result from call and return receiver
1181 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1182 return receiver();
1183 }