1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cdsConfig.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/moduleEntry.hpp"
28 #include "classfile/packageEntry.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/verifier.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "jvm.h"
35 #include "logging/log.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.hpp"
39 #include "oops/inlineKlass.inline.hpp"
40 #include "oops/instanceKlass.inline.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "oops/objArrayOop.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "oops/typeArrayOop.inline.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/fieldDescriptor.inline.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/javaThread.hpp"
51 #include "runtime/reflection.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/vframe.inline.hpp"
54 #include "utilities/formatBuffer.hpp"
55 #include "utilities/globalDefinitions.hpp"
56
57 static void trace_class_resolution(oop mirror) {
58 if (mirror == nullptr || java_lang_Class::is_primitive(mirror)) {
59 return;
60 }
61 Klass* to_class = java_lang_Class::as_Klass(mirror);
62 ResourceMark rm;
63 int line_number = -1;
64 const char * source_file = nullptr;
65 Klass* caller = nullptr;
66 JavaThread* jthread = JavaThread::current();
67 if (jthread->has_last_Java_frame()) {
68 vframeStream vfst(jthread);
69 // skip over any frames belonging to java.lang.Class
70 while (!vfst.at_end() &&
71 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class()) {
72 vfst.next();
73 }
74 if (!vfst.at_end()) {
75 // this frame is a likely suspect
76 caller = vfst.method()->method_holder();
77 line_number = vfst.method()->line_number_from_bci(vfst.bci());
78 Symbol* s = vfst.method()->method_holder()->source_file_name();
79 if (s != nullptr) {
80 source_file = s->as_C_string();
81 }
82 }
83 }
84 if (caller != nullptr) {
85 const char * from = caller->external_name();
86 const char * to = to_class->external_name();
87 // print in a single call to reduce interleaving between threads
88 if (source_file != nullptr) {
89 log_debug(class, resolve)("%s %s %s:%d (reflection)", from, to, source_file, line_number);
90 } else {
91 log_debug(class, resolve)("%s %s (reflection)", from, to);
92 }
93 }
94 }
95
96
97 oop Reflection::box(jvalue* value, BasicType type, TRAPS) {
98 if (type == T_VOID) {
99 return nullptr;
100 }
101 if (is_reference_type(type)) {
102 // regular objects are not boxed
103 return cast_to_oop(value->l);
104 }
105 oop result = java_lang_boxing_object::create(type, value, CHECK_NULL);
106 if (result == nullptr) {
107 THROW_(vmSymbols::java_lang_IllegalArgumentException(), result);
108 }
109 return result;
110 }
111
112
113 BasicType Reflection::unbox_for_primitive(oop box, jvalue* value, TRAPS) {
114 if (box == nullptr) {
115 THROW_(vmSymbols::java_lang_IllegalArgumentException(), T_ILLEGAL);
116 }
117 return java_lang_boxing_object::get_value(box, value);
118 }
119
120 BasicType Reflection::unbox_for_regular_object(oop box, jvalue* value) {
121 // Note: box is really the unboxed oop. It might even be a Short, etc.!
122 value->l = cast_from_oop<jobject>(box);
123 return T_OBJECT;
124 }
125
126
127 void Reflection::widen(jvalue* value, BasicType current_type, BasicType wide_type, TRAPS) {
128 assert(wide_type != current_type, "widen should not be called with identical types");
129 switch (wide_type) {
130 case T_BOOLEAN:
131 case T_BYTE:
132 case T_CHAR:
133 break; // fail
134 case T_SHORT:
135 switch (current_type) {
136 case T_BYTE:
137 value->s = (jshort) value->b;
138 return;
139 default:
140 break;
141 }
142 break; // fail
143 case T_INT:
144 switch (current_type) {
145 case T_BYTE:
146 value->i = (jint) value->b;
147 return;
148 case T_CHAR:
149 value->i = (jint) value->c;
150 return;
151 case T_SHORT:
152 value->i = (jint) value->s;
153 return;
154 default:
155 break;
156 }
157 break; // fail
158 case T_LONG:
159 switch (current_type) {
160 case T_BYTE:
161 value->j = (jlong) value->b;
162 return;
163 case T_CHAR:
164 value->j = (jlong) value->c;
165 return;
166 case T_SHORT:
167 value->j = (jlong) value->s;
168 return;
169 case T_INT:
170 value->j = (jlong) value->i;
171 return;
172 default:
173 break;
174 }
175 break; // fail
176 case T_FLOAT:
177 switch (current_type) {
178 case T_BYTE:
179 value->f = (jfloat) value->b;
180 return;
181 case T_CHAR:
182 value->f = (jfloat) value->c;
183 return;
184 case T_SHORT:
185 value->f = (jfloat) value->s;
186 return;
187 case T_INT:
188 value->f = (jfloat) value->i;
189 return;
190 case T_LONG:
191 value->f = (jfloat) value->j;
192 return;
193 default:
194 break;
195 }
196 break; // fail
197 case T_DOUBLE:
198 switch (current_type) {
199 case T_BYTE:
200 value->d = (jdouble) value->b;
201 return;
202 case T_CHAR:
203 value->d = (jdouble) value->c;
204 return;
205 case T_SHORT:
206 value->d = (jdouble) value->s;
207 return;
208 case T_INT:
209 value->d = (jdouble) value->i;
210 return;
211 case T_FLOAT:
212 value->d = (jdouble) value->f;
213 return;
214 case T_LONG:
215 value->d = (jdouble) value->j;
216 return;
217 default:
218 break;
219 }
220 break; // fail
221 default:
222 break; // fail
223 }
224 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
225 }
226
227
228 BasicType Reflection::array_get(jvalue* value, arrayOop a, int index, TRAPS) {
229 if (!a->is_within_bounds(index)) {
230 THROW_(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), T_ILLEGAL);
231 }
232 if (a->is_objArray()) {
233 oop o = objArrayOop(a)->obj_at(index, CHECK_(T_ILLEGAL)); // reading from a flat array can throw an OOM
234 value->l = cast_from_oop<jobject>(o);
235 return T_OBJECT;
236 } else {
237 assert(a->is_typeArray(), "just checking");
238 BasicType type = TypeArrayKlass::cast(a->klass())->element_type();
239 switch (type) {
240 case T_BOOLEAN:
241 value->z = typeArrayOop(a)->bool_at(index);
242 break;
243 case T_CHAR:
244 value->c = typeArrayOop(a)->char_at(index);
245 break;
246 case T_FLOAT:
247 value->f = typeArrayOop(a)->float_at(index);
248 break;
249 case T_DOUBLE:
250 value->d = typeArrayOop(a)->double_at(index);
251 break;
252 case T_BYTE:
253 value->b = typeArrayOop(a)->byte_at(index);
254 break;
255 case T_SHORT:
256 value->s = typeArrayOop(a)->short_at(index);
257 break;
258 case T_INT:
259 value->i = typeArrayOop(a)->int_at(index);
260 break;
261 case T_LONG:
262 value->j = typeArrayOop(a)->long_at(index);
263 break;
264 default:
265 return T_ILLEGAL;
266 }
267 return type;
268 }
269 }
270
271
272 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) {
273 if (!a->is_within_bounds(index)) {
274 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
275 }
276
277 if (value_type == T_OBJECT) {
278 assert(a->is_objArray(), "just checking");
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 } else {
292 assert(a->is_typeArray(), "just checking");
293 BasicType array_type = TypeArrayKlass::cast(a->klass())->element_type();
294 if (array_type != value_type) {
295 // The widen operation can potentially throw an exception, but cannot block,
296 // so typeArrayOop a is safe if the call succeeds.
297 widen(value, value_type, array_type, CHECK);
298 }
299 switch (array_type) {
300 case T_BOOLEAN:
301 typeArrayOop(a)->bool_at_put(index, value->z);
302 break;
303 case T_CHAR:
304 typeArrayOop(a)->char_at_put(index, value->c);
305 break;
306 case T_FLOAT:
307 typeArrayOop(a)->float_at_put(index, value->f);
308 break;
309 case T_DOUBLE:
310 typeArrayOop(a)->double_at_put(index, value->d);
311 break;
312 case T_BYTE:
313 typeArrayOop(a)->byte_at_put(index, value->b);
314 break;
315 case T_SHORT:
316 typeArrayOop(a)->short_at_put(index, value->s);
317 break;
318 case T_INT:
319 typeArrayOop(a)->int_at_put(index, value->i);
320 break;
321 case T_LONG:
322 typeArrayOop(a)->long_at_put(index, value->j);
323 break;
324 default:
325 THROW(vmSymbols::java_lang_IllegalArgumentException());
326 }
327 }
328 }
329
330
331 // Conversion
332 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) {
333 assert(java_lang_Class::is_primitive(basic_type_mirror),
334 "just checking");
335 return java_lang_Class::primitive_type(basic_type_mirror);
336 }
337
338 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) {
339 BasicType type = basic_type_mirror_to_basic_type(basic_type_mirror);
340 if (type == T_VOID) {
341 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
342 }
343 else {
344 return Universe::typeArrayKlass(type);
345 }
346 }
347
348 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) {
349 if (element_mirror == nullptr) {
350 THROW_NULL(vmSymbols::java_lang_NullPointerException());
351 }
352 if (length < 0) {
353 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length));
354 }
355 if (java_lang_Class::is_primitive(element_mirror)) {
356 BasicType type = basic_type_mirror_to_basic_type(element_mirror);
357 if (type == T_VOID) {
358 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
359 }
360 return oopFactory::new_typeArray(type, length, CHECK_NULL);
361 } else {
362 Klass* k = java_lang_Class::as_Klass(element_mirror);
363 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) {
364 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
365 }
366 return oopFactory::new_objArray(k, length, THREAD);
367 }
368 }
369
370
371 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) {
372 assert(dim_array->is_typeArray(), "just checking");
373 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking");
374
375 if (element_mirror == nullptr) {
376 THROW_NULL(vmSymbols::java_lang_NullPointerException());
377 }
378
379 int len = dim_array->length();
380 if (len <= 0 || len > MAX_DIM) {
381 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
382 }
383
384 jint dimensions[MAX_DIM]; // C array copy of intArrayOop
385 for (int i = 0; i < len; i++) {
386 int d = dim_array->int_at(i);
387 if (d < 0) {
388 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d));
389 }
390 dimensions[i] = d;
391 }
392
393 Klass* klass;
394 int dim = len;
395 if (java_lang_Class::is_primitive(element_mirror)) {
396 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL);
397 } else {
398 klass = java_lang_Class::as_Klass(element_mirror);
399 if (klass->is_array_klass()) {
400 int k_dim = ArrayKlass::cast(klass)->dimension();
401 if (k_dim + len > MAX_DIM) {
402 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
403 }
404 dim += k_dim;
405 }
406 }
407 klass = klass->array_klass(dim, CHECK_NULL);
408 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL);
409 assert(obj->is_array(), "just checking");
410 return arrayOop(obj);
411 }
412
413
414 static bool can_relax_access_check_for(const Klass* accessor,
415 const Klass* accessee,
416 bool classloader_only) {
417
418 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor);
419 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee);
420
421 if (RelaxAccessControlCheck &&
422 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION &&
423 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) {
424 return classloader_only &&
425 Verifier::relax_access_for(accessor_ik->class_loader()) &&
426 accessor_ik->protection_domain() == accessee_ik->protection_domain() &&
427 accessor_ik->class_loader() == accessee_ik->class_loader();
428 }
429
430 return false;
431 }
432
433 /*
434 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if:
435
436 Callee T in Callee T in package PT,
437 unnamed module runtime module MT
438 ------------------------------------------------------------------------------------------------
439
440 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES
441 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES
442 unnamed module: YES
443 Else if (MS can read MT (establish readability) &&
444 ((MT exports PT to MS or to all modules) ||
445 (MT is open))): YES
446
447 ------------------------------------------------------------------------------------------------
448 Caller S in unnamed YES Readability exists because unnamed module
449 module UM "reads" all modules
450 if (MT exports PT to UM or to all modules): YES
451
452 ------------------------------------------------------------------------------------------------
453
454 Note: a loose module is a module that can read all current and future unnamed modules.
455 */
456 Reflection::VerifyClassAccessResults Reflection::verify_class_access(
457 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) {
458
459 // Verify that current_class can access new_class. If the classloader_only
460 // flag is set, we automatically allow any accesses in which current_class
461 // doesn't have a classloader.
462 if ((current_class == nullptr) ||
463 (current_class == new_class) ||
464 is_same_class_package(current_class, new_class)) {
465 return ACCESS_OK;
466 }
467
468 // module boundaries
469 if (new_class->is_public()) {
470 // Find the module entry for current_class, the accessor
471 ModuleEntry* module_from = current_class->module();
472 // Find the module entry for new_class, the accessee
473 ModuleEntry* module_to = new_class->module();
474
475 // both in same (possibly unnamed) module
476 if (module_from == module_to) {
477 return ACCESS_OK;
478 }
479
480 // Acceptable access to a type in an unnamed module. Note that since
481 // unnamed modules can read all unnamed modules, this also handles the
482 // case where module_from is also unnamed but in a different class loader.
483 if (!module_to->is_named() &&
484 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) {
485 return ACCESS_OK;
486 }
487
488 // Establish readability, check if module_from is allowed to read module_to.
489 if (!module_from->can_read(module_to)) {
490 return MODULE_NOT_READABLE;
491 }
492
493 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported
494 if (module_to->is_open()) {
495 return ACCESS_OK;
496 }
497
498 PackageEntry* package_to = new_class->package();
499 assert(package_to != nullptr, "can not obtain new_class' package");
500
501 {
502 MutexLocker m1(Module_lock);
503
504 // Once readability is established, if module_to exports T unqualifiedly,
505 // (to all modules), than whether module_from is in the unnamed module
506 // or not does not matter, access is allowed.
507 if (package_to->is_unqual_exported()) {
508 return ACCESS_OK;
509 }
510
511 // Access is allowed if both 1 & 2 hold:
512 // 1. Readability, module_from can read module_to (established above).
513 // 2. Either module_to exports T to module_from qualifiedly.
514 // or
515 // module_to exports T to all unnamed modules and module_from is unnamed.
516 // or
517 // module_to exports T unqualifiedly to all modules (checked above).
518 if (!package_to->is_qexported_to(module_from)) {
519 return TYPE_NOT_EXPORTED;
520 }
521 }
522 return ACCESS_OK;
523 }
524
525 if (can_relax_access_check_for(current_class, new_class, classloader_only)) {
526 return ACCESS_OK;
527 }
528 return OTHER_PROBLEM;
529 }
530
531 // Return an error message specific to the specified Klass*'s and result.
532 // This function must be called from within a block containing a ResourceMark.
533 char* Reflection::verify_class_access_msg(const Klass* current_class,
534 const InstanceKlass* new_class,
535 const VerifyClassAccessResults result) {
536 assert(result != ACCESS_OK, "must be failure result");
537 char * msg = nullptr;
538 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) {
539 // Find the module entry for current_class, the accessor
540 ModuleEntry* module_from = current_class->module();
541 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE;
542 const char * current_class_name = current_class->external_name();
543
544 // Find the module entry for new_class, the accessee
545 ModuleEntry* module_to = nullptr;
546 module_to = new_class->module();
547 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE;
548 const char * new_class_name = new_class->external_name();
549
550 if (result == MODULE_NOT_READABLE) {
551 assert(module_from->is_named(), "Unnamed modules can read all modules");
552 if (module_to->is_named()) {
553 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) +
554 strlen(new_class_name) + 2*strlen(module_to_name);
555 msg = NEW_RESOURCE_ARRAY(char, len);
556 jio_snprintf(msg, len,
557 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s",
558 current_class_name, module_from_name, new_class_name,
559 module_to_name, module_from_name, module_to_name);
560 } else {
561 oop module_oop = module_to->module_oop();
562 assert(module_oop != nullptr, "should have been initialized");
563 intptr_t identity_hash = module_oop->identity_hash();
564 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) +
565 strlen(new_class_name) + 2*sizeof(uintx);
566 msg = NEW_RESOURCE_ARRAY(char, len);
567 jio_snprintf(msg, len,
568 "class %s (in module %s) cannot access class %s (in unnamed module @0x%zx) because module %s does not read unnamed module @0x%zx",
569 current_class_name, module_from_name, new_class_name, uintx(identity_hash),
570 module_from_name, uintx(identity_hash));
571 }
572
573 } else if (result == TYPE_NOT_EXPORTED) {
574 assert(new_class->package() != nullptr,
575 "Unnamed packages are always exported");
576 const char * package_name =
577 new_class->package()->name()->as_klass_external_name();
578 assert(module_to->is_named(), "Unnamed modules export all packages");
579 if (module_from->is_named()) {
580 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) +
581 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name);
582 msg = NEW_RESOURCE_ARRAY(char, len);
583 jio_snprintf(msg, len,
584 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s",
585 current_class_name, module_from_name, new_class_name,
586 module_to_name, module_to_name, package_name, module_from_name);
587 } else {
588 oop module_oop = module_from->module_oop();
589 assert(module_oop != nullptr, "should have been initialized");
590 intptr_t identity_hash = module_oop->identity_hash();
591 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) +
592 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx);
593 msg = NEW_RESOURCE_ARRAY(char, len);
594 jio_snprintf(msg, len,
595 "class %s (in unnamed module @0x%zx) cannot access class %s (in module %s) because module %s does not export %s to unnamed module @0x%zx",
596 current_class_name, uintx(identity_hash), new_class_name, module_to_name,
597 module_to_name, package_name, uintx(identity_hash));
598 }
599 } else {
600 ShouldNotReachHere();
601 }
602 } // result != OTHER_PROBLEM...
603 return msg;
604 }
605
606 bool Reflection::verify_member_access(const Klass* current_class,
607 const Klass* resolved_class,
608 const Klass* member_class,
609 AccessFlags access,
610 bool classloader_only,
611 bool protected_restriction,
612 TRAPS) {
613 // Verify that current_class can access a member of member_class, where that
614 // field's access bits are "access". We assume that we've already verified
615 // that current_class can access member_class.
616 //
617 // If the classloader_only flag is set, we automatically allow any accesses
618 // in which current_class doesn't have a classloader.
619 //
620 // "resolved_class" is the runtime type of "member_class". Sometimes we don't
621 // need this distinction (e.g. if all we have is the runtime type, or during
622 // class file parsing when we only care about the static type); in that case
623 // callers should ensure that resolved_class == member_class.
624 //
625 if ((current_class == nullptr) ||
626 (current_class == member_class) ||
627 access.is_public()) {
628 return true;
629 }
630
631 if (current_class == member_class) {
632 return true;
633 }
634
635 if (access.is_protected()) {
636 if (!protected_restriction) {
637 // See if current_class (or outermost host class) is a subclass of member_class
638 // An interface may not access protected members of j.l.Object
639 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) {
640 if (access.is_static() || // static fields are ok, see 6622385
641 current_class == resolved_class ||
642 member_class == resolved_class ||
643 current_class->is_subclass_of(resolved_class) ||
644 resolved_class->is_subclass_of(current_class)) {
645 return true;
646 }
647 }
648 }
649 }
650
651 // package access
652 if (!access.is_private() && is_same_class_package(current_class, member_class)) {
653 return true;
654 }
655
656 // private access between different classes needs a nestmate check.
657 if (access.is_private()) {
658 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) {
659 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class));
660 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class));
661 // Nestmate access checks may require resolution and validation of the nest-host.
662 // It is up to the caller to check for pending exceptions and handle appropriately.
663 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false);
664 if (access) {
665 guarantee(resolved_class->is_subclass_of(member_class), "must be!");
666 return true;
667 }
668 }
669 }
670
671 // Check for special relaxations
672 return can_relax_access_check_for(current_class, member_class, classloader_only);
673 }
674
675 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) {
676 return InstanceKlass::cast(class1)->is_same_class_package(class2);
677 }
678
679 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not,
680 // throw an incompatible class change exception
681 // If inner_is_member, require the inner to be a member of the outer.
682 // If !inner_is_member, require the inner to be hidden (non-member).
683 // Caller is responsible for figuring out in advance which case must be true.
684 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner,
685 bool inner_is_member, TRAPS) {
686 InnerClassesIterator iter(outer);
687 constantPoolHandle cp (THREAD, outer->constants());
688 for (; !iter.done(); iter.next()) {
689 int ioff = iter.inner_class_info_index();
690 int ooff = iter.outer_class_info_index();
691
692 if (inner_is_member && ioff != 0 && ooff != 0) {
693 if (cp->klass_name_at_matches(outer, ooff) &&
694 cp->klass_name_at_matches(inner, ioff)) {
695 Klass* o = cp->klass_at(ooff, CHECK);
696 if (o == outer) {
697 Klass* i = cp->klass_at(ioff, CHECK);
698 if (i == inner) {
699 return;
700 }
701 }
702 }
703 }
704
705 if (!inner_is_member && ioff != 0 && ooff == 0 &&
706 cp->klass_name_at_matches(inner, ioff)) {
707 Klass* i = cp->klass_at(ioff, CHECK);
708 if (i == inner) {
709 return;
710 }
711 }
712 }
713
714 // 'inner' not declared as an inner klass in outer
715 ResourceMark rm(THREAD);
716 // Names are all known to be < 64k so we know this formatted message is not excessively large.
717 Exceptions::fthrow(
718 THREAD_AND_LOCATION,
719 vmSymbols::java_lang_IncompatibleClassChangeError(),
720 "%s and %s disagree on InnerClasses attribute",
721 outer->external_name(),
722 inner->external_name()
723 );
724 }
725
726 static objArrayHandle get_parameter_types(const methodHandle& method,
727 int parameter_count,
728 oop* return_type,
729 TRAPS) {
730 objArrayOop m;
731 if (parameter_count == 0) {
732 // Avoid allocating an array for the empty case
733 // Still need to parse the signature for the return type below
734 m = Universe::the_empty_class_array();
735 } else {
736 // Allocate array holding parameter types (java.lang.Class instances)
737 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle()));
738 }
739 objArrayHandle mirrors(THREAD, m);
740 int index = 0;
741 // Collect parameter types
742 ResourceMark rm(THREAD);
743 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) {
744 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle()));
745 if (log_is_enabled(Debug, class, resolve)) {
746 trace_class_resolution(mirror);
747 }
748 if (!ss.at_return_type()) {
749 mirrors->obj_at_put(index++, mirror);
750 } else if (return_type != nullptr) {
751 // Collect return type as well
752 assert(ss.at_return_type(), "return type should be present");
753 *return_type = mirror;
754 }
755 }
756 assert(index == parameter_count, "invalid parameter count");
757 return mirrors;
758 }
759
760 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) {
761 return method->resolved_checked_exceptions(THREAD);
762 }
763
764 static Handle new_type(Symbol* signature, Klass* k, TRAPS) {
765 ResolvingSignatureStream ss(signature, k, false);
766 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH);
767 return Handle(THREAD, nt);
768 }
769
770 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) {
771 // Allow jdk.internal.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods.
772 assert(!method()->name()->starts_with('<') || for_constant_pool_access,
773 "should call new_constructor instead");
774 InstanceKlass* holder = method->method_holder();
775 int slot = method->method_idnum();
776
777 Symbol* signature = method->signature();
778 int parameter_count = ArgumentCount(signature).size();
779 oop return_type_oop = nullptr;
780 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL);
781 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr;
782
783 Handle return_type(THREAD, return_type_oop);
784
785 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
786 assert(!exception_types.is_null(), "cannot return null");
787
788 Symbol* method_name = method->name();
789 oop name_oop = StringTable::intern(method_name, CHECK_NULL);
790 Handle name = Handle(THREAD, name_oop);
791 if (name == nullptr) return nullptr;
792
793 const int modifiers = method->access_flags().as_method_flags();
794
795 Handle mh = java_lang_reflect_Method::create(CHECK_NULL);
796
797 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror());
798 java_lang_reflect_Method::set_slot(mh(), slot);
799 java_lang_reflect_Method::set_name(mh(), name());
800 java_lang_reflect_Method::set_return_type(mh(), return_type());
801 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types());
802 java_lang_reflect_Method::set_exception_types(mh(), exception_types());
803 java_lang_reflect_Method::set_modifiers(mh(), modifiers);
804 java_lang_reflect_Method::set_override(mh(), false);
805 if (method->generic_signature() != nullptr) {
806 Symbol* gs = method->generic_signature();
807 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
808 java_lang_reflect_Method::set_signature(mh(), sig());
809 }
810 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
811 java_lang_reflect_Method::set_annotations(mh(), an_oop);
812 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
813 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop);
814 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL);
815 java_lang_reflect_Method::set_annotation_default(mh(), an_oop);
816 return mh();
817 }
818
819
820 oop Reflection::new_constructor(const methodHandle& method, TRAPS) {
821 assert(method()->is_object_constructor(),
822 "should call new_method instead");
823
824 InstanceKlass* holder = method->method_holder();
825 int slot = method->method_idnum();
826
827 Symbol* signature = method->signature();
828 int parameter_count = ArgumentCount(signature).size();
829 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL);
830 if (parameter_types.is_null()) return nullptr;
831
832 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL);
833 assert(!exception_types.is_null(), "cannot return null");
834
835 const int modifiers = method->access_flags().as_method_flags();
836
837 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL);
838
839 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror());
840 java_lang_reflect_Constructor::set_slot(ch(), slot);
841 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types());
842 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types());
843 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers);
844 java_lang_reflect_Constructor::set_override(ch(), false);
845 if (method->generic_signature() != nullptr) {
846 Symbol* gs = method->generic_signature();
847 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
848 java_lang_reflect_Constructor::set_signature(ch(), sig());
849 }
850 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL);
851 java_lang_reflect_Constructor::set_annotations(ch(), an_oop);
852 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL);
853 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop);
854 return ch();
855 }
856
857
858 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) {
859 Symbol* field_name = fd->name();
860 oop name_oop = StringTable::intern(field_name, CHECK_NULL);
861 Handle name = Handle(THREAD, name_oop);
862 Symbol* signature = fd->signature();
863 InstanceKlass* holder = fd->field_holder();
864 Handle type = new_type(signature, holder, CHECK_NULL);
865 Handle rh = java_lang_reflect_Field::create(CHECK_NULL);
866
867 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror());
868 java_lang_reflect_Field::set_slot(rh(), fd->index());
869 java_lang_reflect_Field::set_name(rh(), name());
870 java_lang_reflect_Field::set_type(rh(), type());
871
872 int flags = 0;
873 if (fd->is_trusted_final()) {
874 flags |= TRUSTED_FINAL;
875 }
876 if (fd->is_null_free_inline_type()) {
877 flags |= NULL_RESTRICTED;
878 }
879 java_lang_reflect_Field::set_flags(rh(), flags);
880
881 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here.
882 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_field_flags());
883 java_lang_reflect_Field::set_override(rh(), false);
884 if (fd->has_generic_signature()) {
885 Symbol* gs = fd->generic_signature();
886 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL);
887 java_lang_reflect_Field::set_signature(rh(), sig());
888 }
889 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL);
890 java_lang_reflect_Field::set_annotations(rh(), an_oop);
891 return rh();
892 }
893
894 oop Reflection::new_parameter(Handle method, int index, Symbol* sym,
895 int flags, TRAPS) {
896
897 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL);
898
899 if(nullptr != sym) {
900 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL);
901 java_lang_reflect_Parameter::set_name(rh(), name());
902 } else {
903 java_lang_reflect_Parameter::set_name(rh(), nullptr);
904 }
905
906 java_lang_reflect_Parameter::set_modifiers(rh(), flags);
907 java_lang_reflect_Parameter::set_executable(rh(), method());
908 java_lang_reflect_Parameter::set_index(rh(), index);
909 return rh();
910 }
911
912
913 static methodHandle resolve_interface_call(InstanceKlass* klass,
914 const methodHandle& method,
915 Klass* recv_klass,
916 Handle receiver,
917 TRAPS) {
918
919 assert(!method.is_null() , "method should not be null");
920
921 CallInfo info;
922 Symbol* signature = method->signature();
923 Symbol* name = method->name();
924 LinkResolver::resolve_interface_call(info, receiver, recv_klass,
925 LinkInfo(klass, name, signature),
926 true,
927 CHECK_(methodHandle()));
928 return methodHandle(THREAD, info.selected_method());
929 }
930
931 // Narrowing of basic types. Used to create correct jvalues for
932 // boolean, byte, char and short return return values from interpreter
933 // which are returned as ints. Throws IllegalArgumentException.
934 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) {
935 switch (narrow_type) {
936 case T_BOOLEAN:
937 value->z = (jboolean) (value->i & 1);
938 return;
939 case T_BYTE:
940 value->b = (jbyte)value->i;
941 return;
942 case T_CHAR:
943 value->c = (jchar)value->i;
944 return;
945 case T_SHORT:
946 value->s = (jshort)value->i;
947 return;
948 default:
949 break; // fail
950 }
951 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
952 }
953
954
955 // Method call (shared by invoke_method and invoke_constructor)
956 static oop invoke(InstanceKlass* klass,
957 const methodHandle& reflected_method,
958 Handle receiver,
959 bool override,
960 objArrayHandle ptypes,
961 BasicType rtype,
962 objArrayHandle args,
963 bool is_method_invoke,
964 TRAPS) {
965
966 ResourceMark rm(THREAD);
967
968 methodHandle method; // actual method to invoke
969 Klass* target_klass; // target klass, receiver's klass for non-static
970
971 // Ensure klass is initialized
972 klass->initialize(CHECK_NULL);
973
974 bool is_static = reflected_method->is_static();
975 if (is_static) {
976 // ignore receiver argument
977 method = reflected_method;
978 target_klass = klass;
979 } else {
980 // check for null receiver
981 if (receiver.is_null()) {
982 THROW_NULL(vmSymbols::java_lang_NullPointerException());
983 }
984 // Check class of receiver against class declaring method
985 if (!receiver->is_a(klass)) {
986 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class");
987 }
988 // target klass is receiver's klass
989 target_klass = receiver->klass();
990 // no need to resolve if method is private or <init>
991 if (reflected_method->is_private() ||
992 reflected_method->name() == vmSymbols::object_initializer_name()) {
993 method = reflected_method;
994 } else {
995 // resolve based on the receiver
996 if (reflected_method->method_holder()->is_interface()) {
997 // resolve interface call
998 //
999 // Match resolution errors with those thrown due to reflection inlining
1000 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod()
1001 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD);
1002 if (HAS_PENDING_EXCEPTION) {
1003 // Method resolution threw an exception; wrap it in an InvocationTargetException
1004 oop resolution_exception = PENDING_EXCEPTION;
1005 CLEAR_PENDING_EXCEPTION;
1006 // JVMTI has already reported the pending exception
1007 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1008 JvmtiExport::clear_detected_exception(THREAD);
1009 JavaCallArguments args(Handle(THREAD, resolution_exception));
1010 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1011 vmSymbols::throwable_void_signature(),
1012 &args);
1013 }
1014 } else {
1015 // if the method can be overridden, we resolve using the vtable index.
1016 assert(!reflected_method->has_itable_index(), "");
1017 int index = reflected_method->vtable_index();
1018 method = reflected_method;
1019 if (index != Method::nonvirtual_vtable_index) {
1020 method = methodHandle(THREAD, target_klass->method_at_vtable(index));
1021 }
1022 if (!method.is_null()) {
1023 // Check for abstract methods as well
1024 if (method->is_abstract()) {
1025 // new default: 6531596
1026 ResourceMark rm(THREAD);
1027 stringStream ss;
1028 ss.print("'");
1029 Method::print_external_name(&ss, target_klass, method->name(), method->signature());
1030 ss.print("'");
1031 Handle h_origexception = Exceptions::new_exception(THREAD,
1032 vmSymbols::java_lang_AbstractMethodError(), ss.as_string());
1033 JavaCallArguments args(h_origexception);
1034 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1035 vmSymbols::throwable_void_signature(),
1036 &args);
1037 }
1038 }
1039 }
1040 }
1041 }
1042
1043 // I believe this is a ShouldNotGetHere case which requires
1044 // an internal vtable bug. If you ever get this please let Karen know.
1045 if (method.is_null()) {
1046 ResourceMark rm(THREAD);
1047 stringStream ss;
1048 ss.print("'");
1049 Method::print_external_name(&ss, klass,
1050 reflected_method->name(),
1051 reflected_method->signature());
1052 ss.print("'");
1053 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string());
1054 }
1055
1056 assert(ptypes->is_objArray(), "just checking");
1057 int args_len = args.is_null() ? 0 : args->length();
1058 // Check number of arguments
1059 if (ptypes->length() != args_len) {
1060 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1061 "wrong number of arguments");
1062 }
1063
1064 // Create object to contain parameters for the JavaCall
1065 JavaCallArguments java_args(method->size_of_parameters());
1066
1067 if (!is_static) {
1068 java_args.push_oop(receiver);
1069 }
1070
1071 for (int i = 0; i < args_len; i++) {
1072 oop type_mirror = ptypes->obj_at(i, CHECK_NULL);
1073 oop arg = args->obj_at(i, CHECK_NULL);
1074 if (java_lang_Class::is_primitive(type_mirror)) {
1075 jvalue value;
1076 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror);
1077 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL);
1078 if (ptype != atype) {
1079 Reflection::widen(&value, atype, ptype, CHECK_NULL);
1080 }
1081 switch (ptype) {
1082 case T_BOOLEAN: java_args.push_int(value.z); break;
1083 case T_CHAR: java_args.push_int(value.c); break;
1084 case T_BYTE: java_args.push_int(value.b); break;
1085 case T_SHORT: java_args.push_int(value.s); break;
1086 case T_INT: java_args.push_int(value.i); break;
1087 case T_LONG: java_args.push_long(value.j); break;
1088 case T_FLOAT: java_args.push_float(value.f); break;
1089 case T_DOUBLE: java_args.push_double(value.d); break;
1090 default:
1091 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch");
1092 }
1093 } else {
1094 if (arg != nullptr) {
1095 Klass* k = java_lang_Class::as_Klass(type_mirror);
1096 if (!arg->is_a(k)) {
1097 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1098 "argument type mismatch");
1099 }
1100 }
1101 Handle arg_handle(THREAD, arg); // Create handle for argument
1102 java_args.push_oop(arg_handle); // Push handle
1103 }
1104 }
1105
1106 assert(java_args.size_of_parameters() == method->size_of_parameters(),
1107 "just checking");
1108
1109 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an
1110 // oop (i.e., NOT as an handle)
1111 JavaValue result(rtype);
1112 JavaCalls::call(&result, method, &java_args, THREAD);
1113
1114 if (HAS_PENDING_EXCEPTION) {
1115 // Method threw an exception; wrap it in an InvocationTargetException
1116 oop target_exception = PENDING_EXCEPTION;
1117 CLEAR_PENDING_EXCEPTION;
1118 // JVMTI has already reported the pending exception
1119 // JVMTI internal flag reset is needed in order to report InvocationTargetException
1120 JvmtiExport::clear_detected_exception(THREAD);
1121
1122 JavaCallArguments args(Handle(THREAD, target_exception));
1123 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(),
1124 vmSymbols::throwable_void_signature(),
1125 &args);
1126 } else {
1127 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) {
1128 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL);
1129 }
1130 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD);
1131 }
1132 }
1133
1134 // This would be nicer if, say, java.lang.reflect.Method was a subclass
1135 // of java.lang.reflect.Constructor
1136
1137 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) {
1138 oop mirror = java_lang_reflect_Method::clazz(method_mirror);
1139 int slot = java_lang_reflect_Method::slot(method_mirror);
1140 bool override = java_lang_reflect_Method::override(method_mirror) != 0;
1141 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror)));
1142
1143 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror);
1144 BasicType rtype;
1145 if (java_lang_Class::is_primitive(return_type_mirror)) {
1146 rtype = basic_type_mirror_to_basic_type(return_type_mirror);
1147 } else {
1148 rtype = T_OBJECT;
1149 }
1150
1151 InstanceKlass* klass = java_lang_Class::as_InstanceKlass(mirror);
1152 Method* m = klass->method_with_idnum(slot);
1153 if (m == nullptr) {
1154 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1155 }
1156 methodHandle method(THREAD, m);
1157
1158 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD);
1159 }
1160
1161
1162 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) {
1163 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror);
1164 int slot = java_lang_reflect_Constructor::slot(constructor_mirror);
1165 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0;
1166 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror)));
1167
1168 InstanceKlass* klass = java_lang_Class::as_InstanceKlass(mirror);
1169 Method* m = klass->method_with_idnum(slot);
1170 if (m == nullptr) {
1171 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke");
1172 }
1173 methodHandle method(THREAD, m);
1174
1175 // Make sure klass gets initialize
1176 klass->initialize(CHECK_NULL);
1177
1178 // Create new instance (the receiver)
1179 klass->check_valid_for_instantiation(false, CHECK_NULL);
1180 Handle receiver = klass->allocate_instance_handle(CHECK_NULL);
1181
1182 // Ignore result from call and return receiver
1183 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL);
1184 return receiver();
1185 }