1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/packageEntry.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/verifier.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "interpreter/linkResolver.hpp"
35 #include "jvm.h"
36 #include "logging/log.hpp"
37 #include "memory/oopFactory.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "memory/universe.hpp"
40 #include "oops/inlineKlass.inline.hpp"
41 #include "oops/instanceKlass.inline.hpp"
42 #include "oops/klass.inline.hpp"
43 #include "oops/objArrayKlass.hpp"
44 #include "oops/objArrayOop.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "oops/typeArrayOop.inline.hpp"
47 #include "prims/jvmtiExport.hpp"
48 #include "runtime/fieldDescriptor.inline.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/javaThread.hpp"
52 #include "runtime/reflection.hpp"
53 #include "runtime/signature.hpp"
54 #include "runtime/vframe.inline.hpp"
55 #include "utilities/formatBuffer.hpp"
56 #include "utilities/globalDefinitions.hpp"
57
58 static void trace_class_resolution(oop mirror) {
59 if (mirror == nullptr || java_lang_Class::is_primitive(mirror)) {
60 return;
61 }
62 Klass* to_class = java_lang_Class::as_Klass(mirror);
63 ResourceMark rm;
64 int line_number = -1;
65 const char * source_file = nullptr;
66 Klass* caller = nullptr;
67 JavaThread* jthread = JavaThread::current();
68 if (jthread->has_last_Java_frame()) {
69 vframeStream vfst(jthread);
70 // skip over any frames belonging to java.lang.Class
71 while (!vfst.at_end() &&
72 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class()) {
73 vfst.next();
74 }
75 if (!vfst.at_end()) {
76 // this frame is a likely suspect
77 caller = vfst.method()->method_holder();
78 line_number = vfst.method()->line_number_from_bci(vfst.bci());
79 Symbol* s = vfst.method()->method_holder()->source_file_name();
80 if (s != nullptr) {
81 source_file = s->as_C_string();
82 }
83 }
84 }
85 if (caller != nullptr) {
86 const char * from = caller->external_name();
87 const char * to = to_class->external_name();
88 // print in a single call to reduce interleaving between threads
89 if (source_file != nullptr) {
90 log_debug(class, resolve)("%s %s %s:%d (reflection)", from, to, source_file, line_number);
91 } else {
92 log_debug(class, resolve)("%s %s (reflection)", from, to);
93 }
94 }
95 }
96
97
98 oop Reflection::box(jvalue* value, BasicType type, TRAPS) {
99 if (type == T_VOID) {
100 return nullptr;
101 }
102 if (is_reference_type(type)) {
103 // regular objects are not boxed
104 return cast_to_oop(value->l);
105 }
106 oop result = java_lang_boxing_object::create(type, value, CHECK_NULL);
107 if (result == nullptr) {
108 THROW_(vmSymbols::java_lang_IllegalArgumentException(), result);
109 }
110 return result;
111 }
112
113
114 BasicType Reflection::unbox_for_primitive(oop box, jvalue* value, TRAPS) {
115 if (box == nullptr) {
116 THROW_(vmSymbols::java_lang_IllegalArgumentException(), T_ILLEGAL);
117 }
118 return java_lang_boxing_object::get_value(box, value);
119 }
120
121 BasicType Reflection::unbox_for_regular_object(oop box, jvalue* value) {
122 // Note: box is really the unboxed oop. It might even be a Short, etc.!
123 value->l = cast_from_oop<jobject>(box);
124 return T_OBJECT;
125 }
126
127
128 void Reflection::widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS) {
129 assert(wide_type != current_type, "widen should not be called with identical types");
130 switch (wide_type) {
131 case T_BOOLEAN:
132 case T_BYTE:
133 case T_CHAR:
134 break; // fail
135 case T_SHORT:
136 switch (current_type) {
137 case T_BYTE:
138 value->s = (jshort) value->b;
139 return;
140 default:
141 break;
142 }
143 break; // fail
144 case T_INT:
145 switch (current_type) {
146 case T_BYTE:
147 value->i = (jint) value->b;
148 return;
149 case T_CHAR:
150 value->i = (jint) value->c;
151 return;
152 case T_SHORT:
153 value->i = (jint) value->s;
154 return;
155 default:
156 break;
157 }
158 break; // fail
159 case T_LONG:
160 switch (current_type) {
161 case T_BYTE:
162 value->j = (jlong) value->b;
163 return;
164 case T_CHAR:
165 value->j = (jlong) value->c;
166 return;
167 case T_SHORT:
168 value->j = (jlong) value->s;
169 return;
170 case T_INT:
171 value->j = (jlong) value->i;
172 return;
173 default:
174 break;
175 }
176 break; // fail
177 case T_FLOAT:
178 switch (current_type) {
179 case T_BYTE:
180 value->f = (jfloat) value->b;
181 return;
182 case T_CHAR:
183 value->f = (jfloat) value->c;
184 return;
185 case T_SHORT:
186 value->f = (jfloat) value->s;
187 return;
188 case T_INT:
189 value->f = (jfloat) value->i;
190 return;
191 case T_LONG:
192 value->f = (jfloat) value->j;
193 return;
194 default:
195 break;
196 }
197 break; // fail
198 case T_DOUBLE:
199 switch (current_type) {
200 case T_BYTE:
201 value->d = (jdouble) value->b;
202 return;
203 case T_CHAR:
204 value->d = (jdouble) value->c;
205 return;
206 case T_SHORT:
207 value->d = (jdouble) value->s;
208 return;
209 case T_INT:
210 value->d = (jdouble) value->i;
211 return;
212 case T_FLOAT:
213 value->d = (jdouble) value->f;
214 return;
215 case T_LONG:
216 value->d = (jdouble) value->j;
217 return;
218 default:
219 break;
220 }
221 break; // fail
222 default:
223 break; // fail
224 }
225 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
226 }
227
228
229 BasicType Reflection::array_get(jvalue* value, arrayOop a, int index, TRAPS) {
230 if (!a->is_within_bounds(index)) {
231 THROW_(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), T_ILLEGAL);
232 }
233 if (a->is_objArray()) {
234 value->l = cast_from_oop<jobject>(objArrayOop(a)->obj_at(index));
235 return T_OBJECT;
236 } else {
237 assert(a->is_typeArray(), "just checking");
238 BasicType type = TypeArrayKlass::cast(a->klass())->element_type();
239 switch (type) {
240 case T_BOOLEAN:
241 value->z = typeArrayOop(a)->bool_at(index);
242 break;
243 case T_CHAR:
244 value->c = typeArrayOop(a)->char_at(index);
245 break;
246 case T_FLOAT:
247 value->f = typeArrayOop(a)->float_at(index);
248 break;
249 case T_DOUBLE:
250 value->d = typeArrayOop(a)->double_at(index);
251 break;
252 case T_BYTE:
253 value->b = typeArrayOop(a)->byte_at(index);
254 break;
255 case T_SHORT:
256 value->s = typeArrayOop(a)->short_at(index);
257 break;
258 case T_INT:
259 value->i = typeArrayOop(a)->int_at(index);
260 break;
261 case T_LONG:
262 value->j = typeArrayOop(a)->long_at(index);
263 break;
264 default:
265 return T_ILLEGAL;
266 }
267 return type;
268 }
269 }
270
271
272 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) {
273 if (!a->is_within_bounds(index)) {
274 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
275 }
276
277 if (a->is_objArray()) {
278 if (value_type == T_OBJECT) {
279 oop obj = cast_to_oop(value->l);
280 if (a->is_null_free_array() && obj == nullptr) {
281 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "null-restricted array");
282 }
283
284 if (obj != nullptr) {
285 Klass* element_klass = ObjArrayKlass::cast(a->klass())->element_klass();
286 if (!obj->is_a(element_klass)) {
287 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array element type mismatch");
288 }
289 }
290 objArrayOop(a)->obj_at_put(index, obj);
291 }
292 } else {
293 assert(a->is_typeArray(), "just checking");
294 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
295 if (array_type != value_type) {
296 // The widen operation can potentially throw an exception, but cannot block,
297 // so typeArrayOop a is safe if the call succeeds.
298 widen(value, value_type, array_type, CHECK);
299 }
300 switch (array_type) {
301 case T_BOOLEAN:
302 typeArrayOop(a)->bool_at_put(index, value->z);
303 break;
304 case T_CHAR:
305 typeArrayOop(a)->char_at_put(index, value->c);
306 break;
307 case T_FLOAT:
308 typeArrayOop(a)->float_at_put(index, value->f);
309 break;
310 case T_DOUBLE:
311 typeArrayOop(a)->double_at_put(index, value->d);
312 break;
313 case T_BYTE:
314 typeArrayOop(a)->byte_at_put(index, value->b);
315 break;
316 case T_SHORT:
317 typeArrayOop(a)->short_at_put(index, value->s);
318 break;
319 case T_INT:
320 typeArrayOop(a)->int_at_put(index, value->i);
321 break;
322 case T_LONG:
323 typeArrayOop(a)->long_at_put(index, value->j);
324 break;
325 default:
326 THROW(vmSymbols::java_lang_IllegalArgumentException());
327 }
328 }
329 }
330
331 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
332 assert(java_lang_Class::is_primitive(basic_type_mirror), "just checking");
333 BasicType type = java_lang_Class::primitive_type(basic_type_mirror);
334 if (type == T_VOID) {
335 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
336 }
337 else {
338 return Universe::typeArrayKlass(type);
339 }
340 }
341
342 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
343 if (element_mirror == nullptr) {
344 THROW_NULL(vmSymbols::java_lang_NullPointerException());
345 }
346 if (length < 0) {
347 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
348 }
349 if (java_lang_Class::is_primitive(element_mirror)) {
350 Klass* tak = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
351 return TypeArrayKlass::cast(tak)->allocate(length, THREAD);
352 } else {
353 Klass* k = java_lang_Class::as_Klass(element_mirror);
354 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
355 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
356 }
357 return oopFactory::new_objArray(k, length, THREAD);
358 }
359 }
360
361
362 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
363 assert(dim_array->is_typeArray(), "just checking");
364 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
365
366 if (element_mirror == nullptr) {
367 THROW_NULL(vmSymbols::java_lang_NullPointerException());
368 }
369
370 int len = dim_array->length();
371 if (len <= 0 || len > MAX_DIM) {
372 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
373 }
374
375 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
376 for (int i = 0; i < len; i++) {
377 int d = dim_array->int_at(i);
378 if (d < 0) {
379 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
380 }
381 dimensions[i] = d;
382 }
383
384 Klass* klass;
385 int dim = len;
386 if (java_lang_Class::is_primitive(element_mirror)) {
387 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
388 } else {
389 klass = java_lang_Class::as_Klass(element_mirror);
390 if (klass->is_array_klass()) {
391 int k_dim = ArrayKlass::cast(klass)->dimension();
392 if (k_dim + len > MAX_DIM) {
393 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
394 }
395 dim += k_dim;
396 }
397 }
398 klass = klass->array_klass(dim, CHECK_NULL);
399 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
400 assert(obj->is_array(), "just checking");
401 return arrayOop(obj);
402 }
403
404
405 static bool can_relax_access_check_for(const Klass* accessor,
406 const Klass* accessee,
407 bool classloader_only) {
408
409 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
410 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
411
412 if (RelaxAccessControlCheck &&
413 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
414 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
415 return classloader_only &&
416 Verifier::relax_access_for(accessor_ik->class_loader()) &&
417 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
418 accessor_ik->class_loader() == accessee_ik->class_loader();
419 }
420
421 return false;
422 }
423
424 /*
425 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
426
427 Callee T in Callee T in package PT,
428 unnamed module runtime module MT
429 ------------------------------------------------------------------------------------------------
430
431 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
432 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
433 unnamed module: YES
434 Else if (MS can read MT (establish readability) &&
435 ((MT exports PT to MS or to all modules) ||
436 (MT is open))): YES
437
438 ------------------------------------------------------------------------------------------------
439 Caller S in unnamed YES Readability exists because unnamed module
440 module UM "reads" all modules
441 if (MT exports PT to UM or to all modules): YES
442
443 ------------------------------------------------------------------------------------------------
444
445 Note: a loose module is a module that can read all current and future unnamed modules.
446 */
447 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
448 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
449
450 // Verify that current_class can access new_class. If the classloader_only
451 // flag is set, we automatically allow any accesses in which current_class
452 // doesn't have a classloader.
453 if ((current_class == nullptr) ||
454 (current_class == new_class) ||
455 is_same_class_package(current_class, new_class)) {
456 return ACCESS_OK;
457 }
458 // Allow all accesses from jdk/internal/reflect/SerializationConstructorAccessorImpl subclasses to
459 // succeed trivially.
460 if (vmClasses::reflect_SerializationConstructorAccessorImpl_klass_is_loaded() &&
461 current_class->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
462 return ACCESS_OK;
463 }
464
465 // module boundaries
466 if (new_class->is_public()) {
467 // Find the module entry for current_class, the accessor
468 ModuleEntry* module_from = current_class->module();
469 // Find the module entry for new_class, the accessee
470 ModuleEntry* module_to = new_class->module();
471
472 // both in same (possibly unnamed) module
473 if (module_from == module_to) {
474 return ACCESS_OK;
475 }
476
477 // Acceptable access to a type in an unnamed module. Note that since
478 // unnamed modules can read all unnamed modules, this also handles the
479 // case where module_from is also unnamed but in a different class loader.
480 if (!module_to->is_named() &&
481 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
482 return ACCESS_OK;
483 }
484
485 // Establish readability, check if module_from is allowed to read module_to.
486 if (!module_from->can_read(module_to)) {
487 return MODULE_NOT_READABLE;
488 }
489
490 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
491 if (module_to->is_open()) {
492 return ACCESS_OK;
493 }
494
495 PackageEntry* package_to = new_class->package();
496 assert(package_to != nullptr, "can not obtain new_class' package");
497
498 {
499 MutexLocker m1(Module_lock);
500
501 // Once readability is established, if module_to exports T unqualifiedly,
502 // (to all modules), than whether module_from is in the unnamed module
503 // or not does not matter, access is allowed.
504 if (package_to->is_unqual_exported()) {
505 return ACCESS_OK;
506 }
507
508 // Access is allowed if both 1 & 2 hold:
509 // 1. Readability, module_from can read module_to (established above).
510 // 2. Either module_to exports T to module_from qualifiedly.
511 // or
512 // module_to exports T to all unnamed modules and module_from is unnamed.
513 // or
514 // module_to exports T unqualifiedly to all modules (checked above).
515 if (!package_to->is_qexported_to(module_from)) {
516 return TYPE_NOT_EXPORTED;
517 }
518 }
519 return ACCESS_OK;
520 }
521
522 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
523 return ACCESS_OK;
524 }
525 return OTHER_PROBLEM;
526 }
527
528 // Return an error message specific to the specified Klass*'s and result.
529 // This function must be called from within a block containing a ResourceMark.
530 char* Reflection::verify_class_access_msg(const Klass* current_class,
531 const InstanceKlass* new_class,
532 const VerifyClassAccessResults result) {
533 assert(result != ACCESS_OK, "must be failure result");
534 char * msg = nullptr;
535 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
536 // Find the module entry for current_class, the accessor
537 ModuleEntry* module_from = current_class->module();
538 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
539 const char * current_class_name = current_class->external_name();
540
541 // Find the module entry for new_class, the accessee
542 ModuleEntry* module_to = nullptr;
543 module_to = new_class->module();
544 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
545 const char * new_class_name = new_class->external_name();
546
547 if (result == MODULE_NOT_READABLE) {
548 assert(module_from->is_named(), "Unnamed modules can read all modules");
549 if (module_to->is_named()) {
550 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
551 strlen(new_class_name) + 2*strlen(module_to_name);
552 msg = NEW_RESOURCE_ARRAY(char, len);
553 jio_snprintf(msg, len - 1,
554 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
555 current_class_name, module_from_name, new_class_name,
556 module_to_name, module_from_name, module_to_name);
557 } else {
558 oop jlm = module_to->module();
559 assert(jlm != nullptr, "Null jlm in module_to ModuleEntry");
560 intptr_t identity_hash = jlm->identity_hash();
561 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
562 strlen(new_class_name) + 2*sizeof(uintx);
563 msg = NEW_RESOURCE_ARRAY(char, len);
564 jio_snprintf(msg, len - 1,
565 "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,
566 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
567 module_from_name, uintx(identity_hash));
568 }
569
570 } else if (result == TYPE_NOT_EXPORTED) {
571 assert(new_class->package() != nullptr,
572 "Unnamed packages are always exported");
573 const char * package_name =
574 new_class->package()->name()->as_klass_external_name();
575 assert(module_to->is_named(), "Unnamed modules export all packages");
576 if (module_from->is_named()) {
577 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
578 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
579 msg = NEW_RESOURCE_ARRAY(char, len);
580 jio_snprintf(msg, len - 1,
581 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
582 current_class_name, module_from_name, new_class_name,
583 module_to_name, module_to_name, package_name, module_from_name);
584 } else {
585 oop jlm = module_from->module();
586 assert(jlm != nullptr, "Null jlm in module_from ModuleEntry");
587 intptr_t identity_hash = jlm->identity_hash();
588 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
589 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
590 msg = NEW_RESOURCE_ARRAY(char, len);
591 jio_snprintf(msg, len - 1,
592 "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,
593 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
594 module_to_name, package_name, uintx(identity_hash));
595 }
596 } else {
597 ShouldNotReachHere();
598 }
599 } // result != OTHER_PROBLEM...
600 return msg;
601 }
602
603 bool Reflection::verify_member_access(const Klass* current_class,
604 const Klass* resolved_class,
605 const Klass* member_class,
606 AccessFlags access,
607 bool classloader_only,
608 bool protected_restriction,
609 TRAPS) {
610 // Verify that current_class can access a member of member_class, where that
611 // field's access bits are "access". We assume that we've already verified
612 // that current_class can access member_class.
613 //
614 // If the classloader_only flag is set, we automatically allow any accesses
615 // in which current_class doesn't have a classloader.
616 //
617 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
618 // need this distinction (e.g. if all we have is the runtime type, or during
619 // class file parsing when we only care about the static type); in that case
620 // callers should ensure that resolved_class == member_class.
621 //
622 if ((current_class == nullptr) ||
623 (current_class == member_class) ||
624 access.is_public()) {
625 return true;
626 }
627
628 if (current_class == member_class) {
629 return true;
630 }
631
632 if (access.is_protected()) {
633 if (!protected_restriction) {
634 // See if current_class (or outermost host class) is a subclass of member_class
635 // An interface may not access protected members of j.l.Object
636 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
637 if (access.is_static() || // static fields are ok, see 6622385
638 current_class == resolved_class ||
639 member_class == resolved_class ||
640 current_class->is_subclass_of(resolved_class) ||
641 resolved_class->is_subclass_of(current_class)) {
642 return true;
643 }
644 }
645 }
646 }
647
648 // package access
649 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
650 return true;
651 }
652
653 // private access between different classes needs a nestmate check.
654 if (access.is_private()) {
655 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
656 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
657 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
658 // Nestmate access checks may require resolution and validation of the nest-host.
659 // It is up to the caller to check for pending exceptions and handle appropriately.
660 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
661 if (access) {
662 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
663 return true;
664 }
665 }
666 }
667
668 // Allow all accesses from jdk/internal/reflect/SerializationConstructorAccessorImpl subclasses to
669 // succeed trivially.
670 if (current_class->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
671 return true;
672 }
673
674 // Check for special relaxations
675 return can_relax_access_check_for(current_class, member_class, classloader_only);
676 }
677
678 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
679 return InstanceKlass::cast(class1)->is_same_class_package(class2);
680 }
681
682 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
683 // throw an incompatible class change exception
684 // If inner_is_member, require the inner to be a member of the outer.
685 // If !inner_is_member, require the inner to be hidden (non-member).
686 // Caller is responsible for figuring out in advance which case must be true.
687 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
688 bool inner_is_member, TRAPS) {
689 InnerClassesIterator iter(outer);
690 constantPoolHandle cp (THREAD, outer->constants());
691 for (; !iter.done(); iter.next()) {
692 int ioff = iter.inner_class_info_index();
693 int ooff = iter.outer_class_info_index();
694
695 if (inner_is_member && ioff != 0 && ooff != 0) {
696 if (cp->klass_name_at_matches(outer, ooff) &&
697 cp->klass_name_at_matches(inner, ioff)) {
698 Klass* o = cp->klass_at(ooff, CHECK);
699 if (o == outer) {
700 Klass* i = cp->klass_at(ioff, CHECK);
701 if (i == inner) {
702 return;
703 }
704 }
705 }
706 }
707
708 if (!inner_is_member && ioff != 0 && ooff == 0 &&
709 cp->klass_name_at_matches(inner, ioff)) {
710 Klass* i = cp->klass_at(ioff, CHECK);
711 if (i == inner) {
712 return;
713 }
714 }
715 }
716
717 // 'inner' not declared as an inner klass in outer
718 ResourceMark rm(THREAD);
719 Exceptions::fthrow(
720 THREAD_AND_LOCATION,
721 vmSymbols::java_lang_IncompatibleClassChangeError(),
722 "%s and %s disagree on InnerClasses attribute",
723 outer->external_name(),
724 inner->external_name()
725 );
726 }
727
728 static objArrayHandle get_parameter_types(const methodHandle& method,
729 int parameter_count,
730 oop* return_type,
731 TRAPS) {
732 objArrayOop m;
733 if (parameter_count == 0) {
734 // Avoid allocating an array for the empty case
735 // Still need to parse the signature for the return type below
736 m = Universe::the_empty_class_array();
737 } else {
738 // Allocate array holding parameter types (java.lang.Class instances)
739 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
740 }
741 objArrayHandle mirrors(THREAD, m);
742 int index = 0;
743 // Collect parameter types
744 ResourceMark rm(THREAD);
745 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) {
746 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle()));
747 if (log_is_enabled(Debug, class, resolve)) {
748 trace_class_resolution(mirror);
749 }
750 if (!ss.at_return_type()) {
751 mirrors->obj_at_put(index++, mirror);
752 } else if (return_type != nullptr) {
753 // Collect return type as well
754 assert(ss.at_return_type(), "return type should be present");
755 *return_type = mirror;
756 }
757 }
758 assert(index == parameter_count, "invalid parameter count");
759 return mirrors;
760 }
761
762 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) {
763 return method->resolved_checked_exceptions(THREAD);
764 }
765
766 static Handle new_type(Symbol* signature, Klass* k, TRAPS) {
767 ResolvingSignatureStream ss(signature, k, false);
768 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH);
769 return Handle(THREAD, nt);
770 }
771
772 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
773 // Allow sun.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
774 assert(!method()->name()->starts_with('<') || for_constant_pool_access,
775 "should call new_constructor instead");
776 InstanceKlass* holder = method->method_holder();
777 int slot = method->method_idnum();
778
779 Symbol* signature = method->signature();
780 int parameter_count = ArgumentCount(signature).size();
781 oop return_type_oop = nullptr;
782 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
783 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
784
785 Handle return_type(THREAD, return_type_oop);
786
787 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
788 assert(!exception_types.is_null(), "cannot return null");
789
790 Symbol* method_name = method->name();
791 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
792 Handle name = Handle(THREAD, name_oop);
793 if (name == nullptr) return nullptr;
794
795 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
796
797 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
798
799 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
800 java_lang_reflect_Method::set_slot(mh(), slot);
801 java_lang_reflect_Method::set_name(mh(), name());
802 java_lang_reflect_Method::set_return_type(mh(), return_type());
803 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
804 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
805 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
806 java_lang_reflect_Method::set_override(mh(), false);
807 if (method->generic_signature() != nullptr) {
808 Symbol* gs = method->generic_signature();
809 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
810 java_lang_reflect_Method::set_signature(mh(), sig());
811 }
812 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
813 java_lang_reflect_Method::set_annotations(mh(), an_oop);
814 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
815 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
816 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
817 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
818 return mh();
819 }
820
821
822 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
823 assert(method()->is_object_constructor(),
824 "should call new_method instead");
825
826 InstanceKlass* holder = method->method_holder();
827 int slot = method->method_idnum();
828
829 Symbol* signature = method->signature();
830 int parameter_count = ArgumentCount(signature).size();
831 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
832 if (parameter_types.is_null()) return nullptr;
833
834 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
835 assert(!exception_types.is_null(), "cannot return null");
836
837 const int modifiers = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
838
839 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
840
841 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
842 java_lang_reflect_Constructor::set_slot(ch(), slot);
843 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
844 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
845 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
846 java_lang_reflect_Constructor::set_override(ch(), false);
847 if (method->generic_signature() != nullptr) {
848 Symbol* gs = method->generic_signature();
849 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
850 java_lang_reflect_Constructor::set_signature(ch(), sig());
851 }
852 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
853 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
854 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
855 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
856 return ch();
857 }
858
859
860 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
861 Symbol* field_name = fd->name();
862 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
863 Handle name = Handle(THREAD, name_oop);
864 Symbol* signature = fd->signature();
865 InstanceKlass* holder = fd->field_holder();
866 Handle type = new_type(signature, holder, CHECK_NULL);
867 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
868
869 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
870 java_lang_reflect_Field::set_slot(rh(), fd->index());
871 java_lang_reflect_Field::set_name(rh(), name());
872 java_lang_reflect_Field::set_type(rh(), type());
873
874 int flags = 0;
875 if (fd->is_trusted_final()) {
876 flags |= TRUSTED_FINAL;
877 }
878 if (fd->is_null_free_inline_type()) {
879 flags |= NULL_RESTRICTED;
880 }
881 java_lang_reflect_Field::set_flags(rh(), flags);
882
883 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
884 int modifiers = fd->access_flags().as_int();
885 java_lang_reflect_Field::set_modifiers(rh(), modifiers);
886 java_lang_reflect_Field::set_override(rh(), false);
887 if (fd->has_generic_signature()) {
888 Symbol* gs = fd->generic_signature();
889 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
890 java_lang_reflect_Field::set_signature(rh(), sig());
891 }
892 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
893 java_lang_reflect_Field::set_annotations(rh(), an_oop);
894 return rh();
895 }
896
897 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
898 int flags, TRAPS) {
899
900 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
901
902 if(nullptr != sym) {
903 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
904 java_lang_reflect_Parameter::set_name(rh(), name());
905 } else {
906 java_lang_reflect_Parameter::set_name(rh(), nullptr);
907 }
908
909 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
910 java_lang_reflect_Parameter::set_executable(rh(), method());
911 java_lang_reflect_Parameter::set_index(rh(), index);
912 return rh();
913 }
914
915
916 static methodHandle resolve_interface_call(InstanceKlass* klass,
917 const methodHandle& method,
918 Klass* recv_klass,
919 Handle receiver,
920 TRAPS) {
921
922 assert(!method.is_null() , "method should not be null");
923
924 CallInfo info;
925 Symbol* signature = method->signature();
926 Symbol* name = method->name();
927 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
928 LinkInfo(klass, name, signature),
929 true,
930 CHECK_(methodHandle()));
931 return methodHandle(THREAD, info.selected_method());
932 }
933
934 // Conversion
935 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
936 assert(java_lang_Class::is_primitive(basic_type_mirror),
937 "just checking");
938 return java_lang_Class::primitive_type(basic_type_mirror);
939 }
940
941 // Narrowing of basic types. Used to create correct jvalues for
942 // boolean, byte, char and short return return values from interpreter
943 // which are returned as ints. Throws IllegalArgumentException.
944 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
945 switch (narrow_type) {
946 case T_BOOLEAN:
947 value->z = (jboolean) (value->i & 1);
948 return;
949 case T_BYTE:
950 value->b = (jbyte)value->i;
951 return;
952 case T_CHAR:
953 value->c = (jchar)value->i;
954 return;
955 case T_SHORT:
956 value->s = (jshort)value->i;
957 return;
958 default:
959 break; // fail
960 }
961 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
962 }
963
964
965 // Method call (shared by invoke_method and invoke_constructor)
966 static oop invoke(InstanceKlass* klass,
967 const methodHandle& reflected_method,
968 Handle receiver,
969 bool override,
970 objArrayHandle ptypes,
971 BasicType rtype,
972 objArrayHandle args,
973 bool is_method_invoke,
974 TRAPS) {
975
976 ResourceMark rm(THREAD);
977
978 methodHandle method; // actual method to invoke
979 Klass* target_klass; // target klass, receiver's klass for non-static
980
981 // Ensure klass is initialized
982 klass->initialize(CHECK_NULL);
983
984 bool is_static = reflected_method->is_static();
985 if (is_static) {
986 // ignore receiver argument
987 method = reflected_method;
988 target_klass = klass;
989 } else {
990 // check for null receiver
991 if (receiver.is_null()) {
992 THROW_NULL(vmSymbols::java_lang_NullPointerException());
993 }
994 // Check class of receiver against class declaring method
995 if (!receiver->is_a(klass)) {
996 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
997 }
998 // target klass is receiver's klass
999 target_klass = receiver->klass();
1000 // no need to resolve if method is private or <init>
1001 if (reflected_method->is_private() ||
1002 reflected_method->name() == vmSymbols::object_initializer_name()) {
1003 method = reflected_method;
1004 } else {
1005 // resolve based on the receiver
1006 if (reflected_method->method_holder()->is_interface()) {
1007 // resolve interface call
1008 //
1009 // Match resolution errors with those thrown due to reflection inlining
1010 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
1011 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
1012 if (HAS_PENDING_EXCEPTION) {
1013 // Method resolution threw an exception; wrap it in an InvocationTargetException
1014 oop resolution_exception = PENDING_EXCEPTION;
1015 CLEAR_PENDING_EXCEPTION;
1016 // JVMTI has already reported the pending exception
1017 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1018 JvmtiExport::clear_detected_exception(THREAD);
1019 JavaCallArguments args(Handle(THREAD, resolution_exception));
1020 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1021 vmSymbols::throwable_void_signature(),
1022 &args);
1023 }
1024 } else {
1025 // if the method can be overridden, we resolve using the vtable index.
1026 assert(!reflected_method->has_itable_index(), "");
1027 int index = reflected_method->vtable_index();
1028 method = reflected_method;
1029 if (index != Method::nonvirtual_vtable_index) {
1030 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1031 }
1032 if (!method.is_null()) {
1033 // Check for abstract methods as well
1034 if (method->is_abstract()) {
1035 // new default: 6531596
1036 ResourceMark rm(THREAD);
1037 stringStream ss;
1038 ss.print("'");
1039 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1040 ss.print("'");
1041 Handle h_origexception = Exceptions::new_exception(THREAD,
1042 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1043 JavaCallArguments args(h_origexception);
1044 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1045 vmSymbols::throwable_void_signature(),
1046 &args);
1047 }
1048 }
1049 }
1050 }
1051 }
1052
1053 // I believe this is a ShouldNotGetHere case which requires
1054 // an internal vtable bug. If you ever get this please let Karen know.
1055 if (method.is_null()) {
1056 ResourceMark rm(THREAD);
1057 stringStream ss;
1058 ss.print("'");
1059 Method::print_external_name(&ss, klass,
1060 reflected_method->name(),
1061 reflected_method->signature());
1062 ss.print("'");
1063 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1064 }
1065
1066 assert(ptypes->is_objArray(), "just checking");
1067 int args_len = args.is_null() ? 0 : args->length();
1068 // Check number of arguments
1069 if (ptypes->length() != args_len) {
1070 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1071 "wrong number of arguments");
1072 }
1073
1074 // Create object to contain parameters for the JavaCall
1075 JavaCallArguments java_args(method->size_of_parameters());
1076
1077 if (!is_static) {
1078 java_args.push_oop(receiver);
1079 }
1080
1081 for (int i = 0; i < args_len; i++) {
1082 oop type_mirror = ptypes->obj_at(i);
1083 oop arg = args->obj_at(i);
1084 if (java_lang_Class::is_primitive(type_mirror)) {
1085 jvalue value;
1086 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1087 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1088 if (ptype != atype) {
1089 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1090 }
1091 switch (ptype) {
1092 case T_BOOLEAN: java_args.push_int(value.z); break;
1093 case T_CHAR: java_args.push_int(value.c); break;
1094 case T_BYTE: java_args.push_int(value.b); break;
1095 case T_SHORT: java_args.push_int(value.s); break;
1096 case T_INT: java_args.push_int(value.i); break;
1097 case T_LONG: java_args.push_long(value.j); break;
1098 case T_FLOAT: java_args.push_float(value.f); break;
1099 case T_DOUBLE: java_args.push_double(value.d); break;
1100 default:
1101 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1102 }
1103 } else {
1104 if (arg != nullptr) {
1105 Klass* k = java_lang_Class::as_Klass(type_mirror);
1106 if (!arg->is_a(k)) {
1107 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1108 "argument type mismatch");
1109 }
1110 }
1111 Handle arg_handle(THREAD, arg); // Create handle for argument
1112 java_args.push_oop(arg_handle); // Push handle
1113 }
1114 }
1115
1116 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1117 "just checking");
1118
1119 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1120 // oop (i.e., NOT as an handle)
1121 JavaValue result(rtype);
1122 JavaCalls::call(&result, method, &java_args, THREAD);
1123
1124 if (HAS_PENDING_EXCEPTION) {
1125 // Method threw an exception; wrap it in an InvocationTargetException
1126 oop target_exception = PENDING_EXCEPTION;
1127 CLEAR_PENDING_EXCEPTION;
1128 // JVMTI has already reported the pending exception
1129 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1130 JvmtiExport::clear_detected_exception(THREAD);
1131
1132 JavaCallArguments args(Handle(THREAD, target_exception));
1133 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1134 vmSymbols::throwable_void_signature(),
1135 &args);
1136 } else {
1137 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1138 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1139 }
1140 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1141 }
1142 }
1143
1144 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1145 // of java.lang.reflect.Constructor
1146
1147 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1148 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1149 int slot = java_lang_reflect_Method::slot(method_mirror);
1150 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1151 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1152
1153 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1154 BasicType rtype;
1155 if (java_lang_Class::is_primitive(return_type_mirror)) {
1156 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1157 } else {
1158 rtype = T_OBJECT;
1159 }
1160
1161 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1162 Method* m = klass->method_with_idnum(slot);
1163 if (m == nullptr) {
1164 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1165 }
1166 methodHandle method(THREAD, m);
1167
1168 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1169 }
1170
1171
1172 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1173 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1174 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1175 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1176 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1177
1178 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1179 Method* m = klass->method_with_idnum(slot);
1180 if (m == nullptr) {
1181 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1182 }
1183 methodHandle method(THREAD, m);
1184
1185 // Make sure klass gets initialize
1186 klass->initialize(CHECK_NULL);
1187
1188 // Create new instance (the receiver)
1189 klass->check_valid_for_instantiation(false, CHECK_NULL);
1190 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1191
1192 // Ignore result from call and return receiver
1193 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1194 return receiver();
1195 }