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 } --- EOF ---