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 value->l = cast_from_oop<jobject>(objArrayOop(a)->obj_at(index)); 234 return T_OBJECT; 235 } else { 236 assert(a->is_typeArray(), "just checking"); 237 BasicType type = TypeArrayKlass::cast(a->klass())->element_type(); 238 switch (type) { 239 case T_BOOLEAN: 240 value->z = typeArrayOop(a)->bool_at(index); 241 break; 242 case T_CHAR: 243 value->c = typeArrayOop(a)->char_at(index); 244 break; 245 case T_FLOAT: 246 value->f = typeArrayOop(a)->float_at(index); 247 break; 248 case T_DOUBLE: 249 value->d = typeArrayOop(a)->double_at(index); 250 break; 251 case T_BYTE: 252 value->b = typeArrayOop(a)->byte_at(index); 253 break; 254 case T_SHORT: 255 value->s = typeArrayOop(a)->short_at(index); 256 break; 257 case T_INT: 258 value->i = typeArrayOop(a)->int_at(index); 259 break; 260 case T_LONG: 261 value->j = typeArrayOop(a)->long_at(index); 262 break; 263 default: 264 return T_ILLEGAL; 265 } 266 return type; 267 } 268 } 269 270 271 void Reflection::array_set(jvalue* value, arrayOop a, int index, BasicType value_type, TRAPS) { 272 if (!a->is_within_bounds(index)) { 273 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 274 } 275 276 if (a->is_objArray()) { 277 if (value_type == T_OBJECT) { 278 oop obj = cast_to_oop(value->l); 279 if (a->is_null_free_array() && obj == nullptr) { 280 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "null-restricted array"); 281 } 282 283 if (obj != nullptr) { 284 Klass* element_klass = ObjArrayKlass::cast(a->klass())->element_klass(); 285 if (!obj->is_a(element_klass)) { 286 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array element type mismatch"); 287 } 288 } 289 objArrayOop(a)->obj_at_put(index, obj); 290 } 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 static Klass* basic_type_mirror_to_arrayklass(oop basic_type_mirror, TRAPS) { 331 assert(java_lang_Class::is_primitive(basic_type_mirror), "just checking"); 332 BasicType type = java_lang_Class::primitive_type(basic_type_mirror); 333 if (type == T_VOID) { 334 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 335 } 336 else { 337 return Universe::typeArrayKlass(type); 338 } 339 } 340 341 arrayOop Reflection::reflect_new_array(oop element_mirror, jint length, TRAPS) { 342 if (element_mirror == nullptr) { 343 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 344 } 345 if (length < 0) { 346 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", length)); 347 } 348 if (java_lang_Class::is_primitive(element_mirror)) { 349 Klass* tak = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL); 350 return TypeArrayKlass::cast(tak)->allocate(length, THREAD); 351 } else { 352 Klass* k = java_lang_Class::as_Klass(element_mirror); 353 if (k->is_array_klass() && ArrayKlass::cast(k)->dimension() >= MAX_DIM) { 354 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 355 } 356 return oopFactory::new_objArray(k, length, THREAD); 357 } 358 } 359 360 361 arrayOop Reflection::reflect_new_multi_array(oop element_mirror, typeArrayOop dim_array, TRAPS) { 362 assert(dim_array->is_typeArray(), "just checking"); 363 assert(TypeArrayKlass::cast(dim_array->klass())->element_type() == T_INT, "just checking"); 364 365 if (element_mirror == nullptr) { 366 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 367 } 368 369 int len = dim_array->length(); 370 if (len <= 0 || len > MAX_DIM) { 371 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 372 } 373 374 jint dimensions[MAX_DIM]; // C array copy of intArrayOop 375 for (int i = 0; i < len; i++) { 376 int d = dim_array->int_at(i); 377 if (d < 0) { 378 THROW_MSG_NULL(vmSymbols::java_lang_NegativeArraySizeException(), err_msg("%d", d)); 379 } 380 dimensions[i] = d; 381 } 382 383 Klass* klass; 384 int dim = len; 385 if (java_lang_Class::is_primitive(element_mirror)) { 386 klass = basic_type_mirror_to_arrayklass(element_mirror, CHECK_NULL); 387 } else { 388 klass = java_lang_Class::as_Klass(element_mirror); 389 if (klass->is_array_klass()) { 390 int k_dim = ArrayKlass::cast(klass)->dimension(); 391 if (k_dim + len > MAX_DIM) { 392 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); 393 } 394 dim += k_dim; 395 } 396 } 397 klass = klass->array_klass(dim, CHECK_NULL); 398 oop obj = ArrayKlass::cast(klass)->multi_allocate(len, dimensions, CHECK_NULL); 399 assert(obj->is_array(), "just checking"); 400 return arrayOop(obj); 401 } 402 403 404 static bool can_relax_access_check_for(const Klass* accessor, 405 const Klass* accessee, 406 bool classloader_only) { 407 408 const InstanceKlass* accessor_ik = InstanceKlass::cast(accessor); 409 const InstanceKlass* accessee_ik = InstanceKlass::cast(accessee); 410 411 if (RelaxAccessControlCheck && 412 accessor_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION && 413 accessee_ik->major_version() < Verifier::NO_RELAX_ACCESS_CTRL_CHECK_VERSION) { 414 return classloader_only && 415 Verifier::relax_access_for(accessor_ik->class_loader()) && 416 accessor_ik->protection_domain() == accessee_ik->protection_domain() && 417 accessor_ik->class_loader() == accessee_ik->class_loader(); 418 } 419 420 return false; 421 } 422 423 /* 424 Type Accessibility check for public types: Callee Type T is accessible to Caller Type S if: 425 426 Callee T in Callee T in package PT, 427 unnamed module runtime module MT 428 ------------------------------------------------------------------------------------------------ 429 430 Caller S in package If MS is loose: YES If same classloader/package (PS == PT): YES 431 PS, runtime module MS If MS can read T's If same runtime module: (MS == MT): YES 432 unnamed module: YES 433 Else if (MS can read MT (establish readability) && 434 ((MT exports PT to MS or to all modules) || 435 (MT is open))): YES 436 437 ------------------------------------------------------------------------------------------------ 438 Caller S in unnamed YES Readability exists because unnamed module 439 module UM "reads" all modules 440 if (MT exports PT to UM or to all modules): YES 441 442 ------------------------------------------------------------------------------------------------ 443 444 Note: a loose module is a module that can read all current and future unnamed modules. 445 */ 446 Reflection::VerifyClassAccessResults Reflection::verify_class_access( 447 const Klass* current_class, const InstanceKlass* new_class, bool classloader_only) { 448 449 // Verify that current_class can access new_class. If the classloader_only 450 // flag is set, we automatically allow any accesses in which current_class 451 // doesn't have a classloader. 452 if ((current_class == nullptr) || 453 (current_class == new_class) || 454 is_same_class_package(current_class, new_class)) { 455 return ACCESS_OK; 456 } 457 458 // module boundaries 459 if (new_class->is_public()) { 460 // Find the module entry for current_class, the accessor 461 ModuleEntry* module_from = current_class->module(); 462 // Find the module entry for new_class, the accessee 463 ModuleEntry* module_to = new_class->module(); 464 465 // both in same (possibly unnamed) module 466 if (module_from == module_to) { 467 return ACCESS_OK; 468 } 469 470 // Acceptable access to a type in an unnamed module. Note that since 471 // unnamed modules can read all unnamed modules, this also handles the 472 // case where module_from is also unnamed but in a different class loader. 473 if (!module_to->is_named() && 474 (module_from->can_read_all_unnamed() || module_from->can_read(module_to))) { 475 return ACCESS_OK; 476 } 477 478 // Establish readability, check if module_from is allowed to read module_to. 479 if (!module_from->can_read(module_to)) { 480 return MODULE_NOT_READABLE; 481 } 482 483 // Access is allowed if module_to is open, i.e. all its packages are unqualifiedly exported 484 if (module_to->is_open()) { 485 return ACCESS_OK; 486 } 487 488 PackageEntry* package_to = new_class->package(); 489 assert(package_to != nullptr, "can not obtain new_class' package"); 490 491 { 492 MutexLocker m1(Module_lock); 493 494 // Once readability is established, if module_to exports T unqualifiedly, 495 // (to all modules), than whether module_from is in the unnamed module 496 // or not does not matter, access is allowed. 497 if (package_to->is_unqual_exported()) { 498 return ACCESS_OK; 499 } 500 501 // Access is allowed if both 1 & 2 hold: 502 // 1. Readability, module_from can read module_to (established above). 503 // 2. Either module_to exports T to module_from qualifiedly. 504 // or 505 // module_to exports T to all unnamed modules and module_from is unnamed. 506 // or 507 // module_to exports T unqualifiedly to all modules (checked above). 508 if (!package_to->is_qexported_to(module_from)) { 509 return TYPE_NOT_EXPORTED; 510 } 511 } 512 return ACCESS_OK; 513 } 514 515 if (can_relax_access_check_for(current_class, new_class, classloader_only)) { 516 return ACCESS_OK; 517 } 518 return OTHER_PROBLEM; 519 } 520 521 // Return an error message specific to the specified Klass*'s and result. 522 // This function must be called from within a block containing a ResourceMark. 523 char* Reflection::verify_class_access_msg(const Klass* current_class, 524 const InstanceKlass* new_class, 525 const VerifyClassAccessResults result) { 526 assert(result != ACCESS_OK, "must be failure result"); 527 char * msg = nullptr; 528 if (result != OTHER_PROBLEM && new_class != nullptr && current_class != nullptr) { 529 // Find the module entry for current_class, the accessor 530 ModuleEntry* module_from = current_class->module(); 531 const char * module_from_name = module_from->is_named() ? module_from->name()->as_C_string() : UNNAMED_MODULE; 532 const char * current_class_name = current_class->external_name(); 533 534 // Find the module entry for new_class, the accessee 535 ModuleEntry* module_to = nullptr; 536 module_to = new_class->module(); 537 const char * module_to_name = module_to->is_named() ? module_to->name()->as_C_string() : UNNAMED_MODULE; 538 const char * new_class_name = new_class->external_name(); 539 540 if (result == MODULE_NOT_READABLE) { 541 assert(module_from->is_named(), "Unnamed modules can read all modules"); 542 if (module_to->is_named()) { 543 size_t len = 100 + strlen(current_class_name) + 2*strlen(module_from_name) + 544 strlen(new_class_name) + 2*strlen(module_to_name); 545 msg = NEW_RESOURCE_ARRAY(char, len); 546 jio_snprintf(msg, len - 1, 547 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not read module %s", 548 current_class_name, module_from_name, new_class_name, 549 module_to_name, module_from_name, module_to_name); 550 } else { 551 oop jlm = module_to->module(); 552 assert(jlm != nullptr, "Null jlm in module_to ModuleEntry"); 553 intptr_t identity_hash = jlm->identity_hash(); 554 size_t len = 160 + strlen(current_class_name) + 2*strlen(module_from_name) + 555 strlen(new_class_name) + 2*sizeof(uintx); 556 msg = NEW_RESOURCE_ARRAY(char, len); 557 jio_snprintf(msg, len - 1, 558 "class %s (in module %s) cannot access class %s (in unnamed module @0x%zx) because module %s does not read unnamed module @0x%zx", 559 current_class_name, module_from_name, new_class_name, uintx(identity_hash), 560 module_from_name, uintx(identity_hash)); 561 } 562 563 } else if (result == TYPE_NOT_EXPORTED) { 564 assert(new_class->package() != nullptr, 565 "Unnamed packages are always exported"); 566 const char * package_name = 567 new_class->package()->name()->as_klass_external_name(); 568 assert(module_to->is_named(), "Unnamed modules export all packages"); 569 if (module_from->is_named()) { 570 size_t len = 118 + strlen(current_class_name) + 2*strlen(module_from_name) + 571 strlen(new_class_name) + 2*strlen(module_to_name) + strlen(package_name); 572 msg = NEW_RESOURCE_ARRAY(char, len); 573 jio_snprintf(msg, len - 1, 574 "class %s (in module %s) cannot access class %s (in module %s) because module %s does not export %s to module %s", 575 current_class_name, module_from_name, new_class_name, 576 module_to_name, module_to_name, package_name, module_from_name); 577 } else { 578 oop jlm = module_from->module(); 579 assert(jlm != nullptr, "Null jlm in module_from ModuleEntry"); 580 intptr_t identity_hash = jlm->identity_hash(); 581 size_t len = 170 + strlen(current_class_name) + strlen(new_class_name) + 582 2*strlen(module_to_name) + strlen(package_name) + 2*sizeof(uintx); 583 msg = NEW_RESOURCE_ARRAY(char, len); 584 jio_snprintf(msg, len - 1, 585 "class %s (in unnamed module @0x%zx) cannot access class %s (in module %s) because module %s does not export %s to unnamed module @0x%zx", 586 current_class_name, uintx(identity_hash), new_class_name, module_to_name, 587 module_to_name, package_name, uintx(identity_hash)); 588 } 589 } else { 590 ShouldNotReachHere(); 591 } 592 } // result != OTHER_PROBLEM... 593 return msg; 594 } 595 596 bool Reflection::verify_member_access(const Klass* current_class, 597 const Klass* resolved_class, 598 const Klass* member_class, 599 AccessFlags access, 600 bool classloader_only, 601 bool protected_restriction, 602 TRAPS) { 603 // Verify that current_class can access a member of member_class, where that 604 // field's access bits are "access". We assume that we've already verified 605 // that current_class can access member_class. 606 // 607 // If the classloader_only flag is set, we automatically allow any accesses 608 // in which current_class doesn't have a classloader. 609 // 610 // "resolved_class" is the runtime type of "member_class". Sometimes we don't 611 // need this distinction (e.g. if all we have is the runtime type, or during 612 // class file parsing when we only care about the static type); in that case 613 // callers should ensure that resolved_class == member_class. 614 // 615 if ((current_class == nullptr) || 616 (current_class == member_class) || 617 access.is_public()) { 618 return true; 619 } 620 621 if (current_class == member_class) { 622 return true; 623 } 624 625 if (access.is_protected()) { 626 if (!protected_restriction) { 627 // See if current_class (or outermost host class) is a subclass of member_class 628 // An interface may not access protected members of j.l.Object 629 if (!current_class->is_interface() && current_class->is_subclass_of(member_class)) { 630 if (access.is_static() || // static fields are ok, see 6622385 631 current_class == resolved_class || 632 member_class == resolved_class || 633 current_class->is_subclass_of(resolved_class) || 634 resolved_class->is_subclass_of(current_class)) { 635 return true; 636 } 637 } 638 } 639 } 640 641 // package access 642 if (!access.is_private() && is_same_class_package(current_class, member_class)) { 643 return true; 644 } 645 646 // private access between different classes needs a nestmate check. 647 if (access.is_private()) { 648 if (current_class->is_instance_klass() && member_class->is_instance_klass() ) { 649 InstanceKlass* cur_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(current_class)); 650 InstanceKlass* field_ik = const_cast<InstanceKlass*>(InstanceKlass::cast(member_class)); 651 // Nestmate access checks may require resolution and validation of the nest-host. 652 // It is up to the caller to check for pending exceptions and handle appropriately. 653 bool access = cur_ik->has_nestmate_access_to(field_ik, CHECK_false); 654 if (access) { 655 guarantee(resolved_class->is_subclass_of(member_class), "must be!"); 656 return true; 657 } 658 } 659 } 660 661 // Check for special relaxations 662 return can_relax_access_check_for(current_class, member_class, classloader_only); 663 } 664 665 bool Reflection::is_same_class_package(const Klass* class1, const Klass* class2) { 666 return InstanceKlass::cast(class1)->is_same_class_package(class2); 667 } 668 669 // Checks that the 'outer' klass has declared 'inner' as being an inner klass. If not, 670 // throw an incompatible class change exception 671 // If inner_is_member, require the inner to be a member of the outer. 672 // If !inner_is_member, require the inner to be hidden (non-member). 673 // Caller is responsible for figuring out in advance which case must be true. 674 void Reflection::check_for_inner_class(const InstanceKlass* outer, const InstanceKlass* inner, 675 bool inner_is_member, TRAPS) { 676 InnerClassesIterator iter(outer); 677 constantPoolHandle cp (THREAD, outer->constants()); 678 for (; !iter.done(); iter.next()) { 679 int ioff = iter.inner_class_info_index(); 680 int ooff = iter.outer_class_info_index(); 681 682 if (inner_is_member && ioff != 0 && ooff != 0) { 683 if (cp->klass_name_at_matches(outer, ooff) && 684 cp->klass_name_at_matches(inner, ioff)) { 685 Klass* o = cp->klass_at(ooff, CHECK); 686 if (o == outer) { 687 Klass* i = cp->klass_at(ioff, CHECK); 688 if (i == inner) { 689 return; 690 } 691 } 692 } 693 } 694 695 if (!inner_is_member && ioff != 0 && ooff == 0 && 696 cp->klass_name_at_matches(inner, ioff)) { 697 Klass* i = cp->klass_at(ioff, CHECK); 698 if (i == inner) { 699 return; 700 } 701 } 702 } 703 704 // 'inner' not declared as an inner klass in outer 705 ResourceMark rm(THREAD); 706 // Names are all known to be < 64k so we know this formatted message is not excessively large. 707 Exceptions::fthrow( 708 THREAD_AND_LOCATION, 709 vmSymbols::java_lang_IncompatibleClassChangeError(), 710 "%s and %s disagree on InnerClasses attribute", 711 outer->external_name(), 712 inner->external_name() 713 ); 714 } 715 716 static objArrayHandle get_parameter_types(const methodHandle& method, 717 int parameter_count, 718 oop* return_type, 719 TRAPS) { 720 objArrayOop m; 721 if (parameter_count == 0) { 722 // Avoid allocating an array for the empty case 723 // Still need to parse the signature for the return type below 724 m = Universe::the_empty_class_array(); 725 } else { 726 // Allocate array holding parameter types (java.lang.Class instances) 727 m = oopFactory::new_objArray(vmClasses::Class_klass(), parameter_count, CHECK_(objArrayHandle())); 728 } 729 objArrayHandle mirrors(THREAD, m); 730 int index = 0; 731 // Collect parameter types 732 ResourceMark rm(THREAD); 733 for (ResolvingSignatureStream ss(method()); !ss.is_done(); ss.next()) { 734 oop mirror = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_(objArrayHandle())); 735 if (log_is_enabled(Debug, class, resolve)) { 736 trace_class_resolution(mirror); 737 } 738 if (!ss.at_return_type()) { 739 mirrors->obj_at_put(index++, mirror); 740 } else if (return_type != nullptr) { 741 // Collect return type as well 742 assert(ss.at_return_type(), "return type should be present"); 743 *return_type = mirror; 744 } 745 } 746 assert(index == parameter_count, "invalid parameter count"); 747 return mirrors; 748 } 749 750 static objArrayHandle get_exception_types(const methodHandle& method, TRAPS) { 751 return method->resolved_checked_exceptions(THREAD); 752 } 753 754 static Handle new_type(Symbol* signature, Klass* k, TRAPS) { 755 ResolvingSignatureStream ss(signature, k, false); 756 oop nt = ss.as_java_mirror(SignatureStream::NCDFError, CHECK_NH); 757 return Handle(THREAD, nt); 758 } 759 760 oop Reflection::new_method(const methodHandle& method, bool for_constant_pool_access, TRAPS) { 761 // Allow jdk.internal.reflect.ConstantPool to refer to <clinit> methods as java.lang.reflect.Methods. 762 assert(!method()->name()->starts_with('<') || for_constant_pool_access, 763 "should call new_constructor instead"); 764 InstanceKlass* holder = method->method_holder(); 765 int slot = method->method_idnum(); 766 767 Symbol* signature = method->signature(); 768 int parameter_count = ArgumentCount(signature).size(); 769 oop return_type_oop = nullptr; 770 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, &return_type_oop, CHECK_NULL); 771 if (parameter_types.is_null() || return_type_oop == nullptr) return nullptr; 772 773 Handle return_type(THREAD, return_type_oop); 774 775 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL); 776 assert(!exception_types.is_null(), "cannot return null"); 777 778 Symbol* method_name = method->name(); 779 oop name_oop = StringTable::intern(method_name, CHECK_NULL); 780 Handle name = Handle(THREAD, name_oop); 781 if (name == nullptr) return nullptr; 782 783 const int modifiers = method->access_flags().as_method_flags(); 784 785 Handle mh = java_lang_reflect_Method::create(CHECK_NULL); 786 787 java_lang_reflect_Method::set_clazz(mh(), holder->java_mirror()); 788 java_lang_reflect_Method::set_slot(mh(), slot); 789 java_lang_reflect_Method::set_name(mh(), name()); 790 java_lang_reflect_Method::set_return_type(mh(), return_type()); 791 java_lang_reflect_Method::set_parameter_types(mh(), parameter_types()); 792 java_lang_reflect_Method::set_exception_types(mh(), exception_types()); 793 java_lang_reflect_Method::set_modifiers(mh(), modifiers); 794 java_lang_reflect_Method::set_override(mh(), false); 795 if (method->generic_signature() != nullptr) { 796 Symbol* gs = method->generic_signature(); 797 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL); 798 java_lang_reflect_Method::set_signature(mh(), sig()); 799 } 800 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL); 801 java_lang_reflect_Method::set_annotations(mh(), an_oop); 802 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL); 803 java_lang_reflect_Method::set_parameter_annotations(mh(), an_oop); 804 an_oop = Annotations::make_java_array(method->annotation_default(), CHECK_NULL); 805 java_lang_reflect_Method::set_annotation_default(mh(), an_oop); 806 return mh(); 807 } 808 809 810 oop Reflection::new_constructor(const methodHandle& method, TRAPS) { 811 assert(method()->is_object_constructor(), 812 "should call new_method instead"); 813 814 InstanceKlass* holder = method->method_holder(); 815 int slot = method->method_idnum(); 816 817 Symbol* signature = method->signature(); 818 int parameter_count = ArgumentCount(signature).size(); 819 objArrayHandle parameter_types = get_parameter_types(method, parameter_count, nullptr, CHECK_NULL); 820 if (parameter_types.is_null()) return nullptr; 821 822 objArrayHandle exception_types = get_exception_types(method, CHECK_NULL); 823 assert(!exception_types.is_null(), "cannot return null"); 824 825 const int modifiers = method->access_flags().as_method_flags(); 826 827 Handle ch = java_lang_reflect_Constructor::create(CHECK_NULL); 828 829 java_lang_reflect_Constructor::set_clazz(ch(), holder->java_mirror()); 830 java_lang_reflect_Constructor::set_slot(ch(), slot); 831 java_lang_reflect_Constructor::set_parameter_types(ch(), parameter_types()); 832 java_lang_reflect_Constructor::set_exception_types(ch(), exception_types()); 833 java_lang_reflect_Constructor::set_modifiers(ch(), modifiers); 834 java_lang_reflect_Constructor::set_override(ch(), false); 835 if (method->generic_signature() != nullptr) { 836 Symbol* gs = method->generic_signature(); 837 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL); 838 java_lang_reflect_Constructor::set_signature(ch(), sig()); 839 } 840 typeArrayOop an_oop = Annotations::make_java_array(method->annotations(), CHECK_NULL); 841 java_lang_reflect_Constructor::set_annotations(ch(), an_oop); 842 an_oop = Annotations::make_java_array(method->parameter_annotations(), CHECK_NULL); 843 java_lang_reflect_Constructor::set_parameter_annotations(ch(), an_oop); 844 return ch(); 845 } 846 847 848 oop Reflection::new_field(fieldDescriptor* fd, TRAPS) { 849 Symbol* field_name = fd->name(); 850 oop name_oop = StringTable::intern(field_name, CHECK_NULL); 851 Handle name = Handle(THREAD, name_oop); 852 Symbol* signature = fd->signature(); 853 InstanceKlass* holder = fd->field_holder(); 854 Handle type = new_type(signature, holder, CHECK_NULL); 855 Handle rh = java_lang_reflect_Field::create(CHECK_NULL); 856 857 java_lang_reflect_Field::set_clazz(rh(), fd->field_holder()->java_mirror()); 858 java_lang_reflect_Field::set_slot(rh(), fd->index()); 859 java_lang_reflect_Field::set_name(rh(), name()); 860 java_lang_reflect_Field::set_type(rh(), type()); 861 862 int flags = 0; 863 if (fd->is_trusted_final()) { 864 flags |= TRUSTED_FINAL; 865 } 866 if (fd->is_null_free_inline_type()) { 867 flags |= NULL_RESTRICTED; 868 } 869 java_lang_reflect_Field::set_flags(rh(), flags); 870 871 // Note the ACC_ANNOTATION bit, which is a per-class access flag, is never set here. 872 java_lang_reflect_Field::set_modifiers(rh(), fd->access_flags().as_field_flags()); 873 java_lang_reflect_Field::set_override(rh(), false); 874 if (fd->has_generic_signature()) { 875 Symbol* gs = fd->generic_signature(); 876 Handle sig = java_lang_String::create_from_symbol(gs, CHECK_NULL); 877 java_lang_reflect_Field::set_signature(rh(), sig()); 878 } 879 typeArrayOop an_oop = Annotations::make_java_array(fd->annotations(), CHECK_NULL); 880 java_lang_reflect_Field::set_annotations(rh(), an_oop); 881 return rh(); 882 } 883 884 oop Reflection::new_parameter(Handle method, int index, Symbol* sym, 885 int flags, TRAPS) { 886 887 Handle rh = java_lang_reflect_Parameter::create(CHECK_NULL); 888 889 if(nullptr != sym) { 890 Handle name = java_lang_String::create_from_symbol(sym, CHECK_NULL); 891 java_lang_reflect_Parameter::set_name(rh(), name()); 892 } else { 893 java_lang_reflect_Parameter::set_name(rh(), nullptr); 894 } 895 896 java_lang_reflect_Parameter::set_modifiers(rh(), flags); 897 java_lang_reflect_Parameter::set_executable(rh(), method()); 898 java_lang_reflect_Parameter::set_index(rh(), index); 899 return rh(); 900 } 901 902 903 static methodHandle resolve_interface_call(InstanceKlass* klass, 904 const methodHandle& method, 905 Klass* recv_klass, 906 Handle receiver, 907 TRAPS) { 908 909 assert(!method.is_null() , "method should not be null"); 910 911 CallInfo info; 912 Symbol* signature = method->signature(); 913 Symbol* name = method->name(); 914 LinkResolver::resolve_interface_call(info, receiver, recv_klass, 915 LinkInfo(klass, name, signature), 916 true, 917 CHECK_(methodHandle())); 918 return methodHandle(THREAD, info.selected_method()); 919 } 920 921 // Conversion 922 static BasicType basic_type_mirror_to_basic_type(oop basic_type_mirror) { 923 assert(java_lang_Class::is_primitive(basic_type_mirror), 924 "just checking"); 925 return java_lang_Class::primitive_type(basic_type_mirror); 926 } 927 928 // Narrowing of basic types. Used to create correct jvalues for 929 // boolean, byte, char and short return return values from interpreter 930 // which are returned as ints. Throws IllegalArgumentException. 931 static void narrow(jvalue* value, BasicType narrow_type, TRAPS) { 932 switch (narrow_type) { 933 case T_BOOLEAN: 934 value->z = (jboolean) (value->i & 1); 935 return; 936 case T_BYTE: 937 value->b = (jbyte)value->i; 938 return; 939 case T_CHAR: 940 value->c = (jchar)value->i; 941 return; 942 case T_SHORT: 943 value->s = (jshort)value->i; 944 return; 945 default: 946 break; // fail 947 } 948 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch"); 949 } 950 951 952 // Method call (shared by invoke_method and invoke_constructor) 953 static oop invoke(InstanceKlass* klass, 954 const methodHandle& reflected_method, 955 Handle receiver, 956 bool override, 957 objArrayHandle ptypes, 958 BasicType rtype, 959 objArrayHandle args, 960 bool is_method_invoke, 961 TRAPS) { 962 963 ResourceMark rm(THREAD); 964 965 methodHandle method; // actual method to invoke 966 Klass* target_klass; // target klass, receiver's klass for non-static 967 968 // Ensure klass is initialized 969 klass->initialize(CHECK_NULL); 970 971 bool is_static = reflected_method->is_static(); 972 if (is_static) { 973 // ignore receiver argument 974 method = reflected_method; 975 target_klass = klass; 976 } else { 977 // check for null receiver 978 if (receiver.is_null()) { 979 THROW_NULL(vmSymbols::java_lang_NullPointerException()); 980 } 981 // Check class of receiver against class declaring method 982 if (!receiver->is_a(klass)) { 983 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "object is not an instance of declaring class"); 984 } 985 // target klass is receiver's klass 986 target_klass = receiver->klass(); 987 // no need to resolve if method is private or <init> 988 if (reflected_method->is_private() || 989 reflected_method->name() == vmSymbols::object_initializer_name()) { 990 method = reflected_method; 991 } else { 992 // resolve based on the receiver 993 if (reflected_method->method_holder()->is_interface()) { 994 // resolve interface call 995 // 996 // Match resolution errors with those thrown due to reflection inlining 997 // Linktime resolution & IllegalAccessCheck already done by Class.getMethod() 998 method = resolve_interface_call(klass, reflected_method, target_klass, receiver, THREAD); 999 if (HAS_PENDING_EXCEPTION) { 1000 // Method resolution threw an exception; wrap it in an InvocationTargetException 1001 oop resolution_exception = PENDING_EXCEPTION; 1002 CLEAR_PENDING_EXCEPTION; 1003 // JVMTI has already reported the pending exception 1004 // JVMTI internal flag reset is needed in order to report InvocationTargetException 1005 JvmtiExport::clear_detected_exception(THREAD); 1006 JavaCallArguments args(Handle(THREAD, resolution_exception)); 1007 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(), 1008 vmSymbols::throwable_void_signature(), 1009 &args); 1010 } 1011 } else { 1012 // if the method can be overridden, we resolve using the vtable index. 1013 assert(!reflected_method->has_itable_index(), ""); 1014 int index = reflected_method->vtable_index(); 1015 method = reflected_method; 1016 if (index != Method::nonvirtual_vtable_index) { 1017 method = methodHandle(THREAD, target_klass->method_at_vtable(index)); 1018 } 1019 if (!method.is_null()) { 1020 // Check for abstract methods as well 1021 if (method->is_abstract()) { 1022 // new default: 6531596 1023 ResourceMark rm(THREAD); 1024 stringStream ss; 1025 ss.print("'"); 1026 Method::print_external_name(&ss, target_klass, method->name(), method->signature()); 1027 ss.print("'"); 1028 Handle h_origexception = Exceptions::new_exception(THREAD, 1029 vmSymbols::java_lang_AbstractMethodError(), ss.as_string()); 1030 JavaCallArguments args(h_origexception); 1031 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(), 1032 vmSymbols::throwable_void_signature(), 1033 &args); 1034 } 1035 } 1036 } 1037 } 1038 } 1039 1040 // I believe this is a ShouldNotGetHere case which requires 1041 // an internal vtable bug. If you ever get this please let Karen know. 1042 if (method.is_null()) { 1043 ResourceMark rm(THREAD); 1044 stringStream ss; 1045 ss.print("'"); 1046 Method::print_external_name(&ss, klass, 1047 reflected_method->name(), 1048 reflected_method->signature()); 1049 ss.print("'"); 1050 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), ss.as_string()); 1051 } 1052 1053 assert(ptypes->is_objArray(), "just checking"); 1054 int args_len = args.is_null() ? 0 : args->length(); 1055 // Check number of arguments 1056 if (ptypes->length() != args_len) { 1057 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1058 "wrong number of arguments"); 1059 } 1060 1061 // Create object to contain parameters for the JavaCall 1062 JavaCallArguments java_args(method->size_of_parameters()); 1063 1064 if (!is_static) { 1065 java_args.push_oop(receiver); 1066 } 1067 1068 for (int i = 0; i < args_len; i++) { 1069 oop type_mirror = ptypes->obj_at(i); 1070 oop arg = args->obj_at(i); 1071 if (java_lang_Class::is_primitive(type_mirror)) { 1072 jvalue value; 1073 BasicType ptype = basic_type_mirror_to_basic_type(type_mirror); 1074 BasicType atype = Reflection::unbox_for_primitive(arg, &value, CHECK_NULL); 1075 if (ptype != atype) { 1076 Reflection::widen(&value, atype, ptype, CHECK_NULL); 1077 } 1078 switch (ptype) { 1079 case T_BOOLEAN: java_args.push_int(value.z); break; 1080 case T_CHAR: java_args.push_int(value.c); break; 1081 case T_BYTE: java_args.push_int(value.b); break; 1082 case T_SHORT: java_args.push_int(value.s); break; 1083 case T_INT: java_args.push_int(value.i); break; 1084 case T_LONG: java_args.push_long(value.j); break; 1085 case T_FLOAT: java_args.push_float(value.f); break; 1086 case T_DOUBLE: java_args.push_double(value.d); break; 1087 default: 1088 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "argument type mismatch"); 1089 } 1090 } else { 1091 if (arg != nullptr) { 1092 Klass* k = java_lang_Class::as_Klass(type_mirror); 1093 if (!arg->is_a(k)) { 1094 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 1095 "argument type mismatch"); 1096 } 1097 } 1098 Handle arg_handle(THREAD, arg); // Create handle for argument 1099 java_args.push_oop(arg_handle); // Push handle 1100 } 1101 } 1102 1103 assert(java_args.size_of_parameters() == method->size_of_parameters(), 1104 "just checking"); 1105 1106 // All oops (including receiver) is passed in as Handles. An potential oop is returned as an 1107 // oop (i.e., NOT as an handle) 1108 JavaValue result(rtype); 1109 JavaCalls::call(&result, method, &java_args, THREAD); 1110 1111 if (HAS_PENDING_EXCEPTION) { 1112 // Method threw an exception; wrap it in an InvocationTargetException 1113 oop target_exception = PENDING_EXCEPTION; 1114 CLEAR_PENDING_EXCEPTION; 1115 // JVMTI has already reported the pending exception 1116 // JVMTI internal flag reset is needed in order to report InvocationTargetException 1117 JvmtiExport::clear_detected_exception(THREAD); 1118 1119 JavaCallArguments args(Handle(THREAD, target_exception)); 1120 THROW_ARG_NULL(vmSymbols::java_lang_reflect_InvocationTargetException(), 1121 vmSymbols::throwable_void_signature(), 1122 &args); 1123 } else { 1124 if (rtype == T_BOOLEAN || rtype == T_BYTE || rtype == T_CHAR || rtype == T_SHORT) { 1125 narrow((jvalue*)result.get_value_addr(), rtype, CHECK_NULL); 1126 } 1127 return Reflection::box((jvalue*)result.get_value_addr(), rtype, THREAD); 1128 } 1129 } 1130 1131 // This would be nicer if, say, java.lang.reflect.Method was a subclass 1132 // of java.lang.reflect.Constructor 1133 1134 oop Reflection::invoke_method(oop method_mirror, Handle receiver, objArrayHandle args, TRAPS) { 1135 oop mirror = java_lang_reflect_Method::clazz(method_mirror); 1136 int slot = java_lang_reflect_Method::slot(method_mirror); 1137 bool override = java_lang_reflect_Method::override(method_mirror) != 0; 1138 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Method::parameter_types(method_mirror))); 1139 1140 oop return_type_mirror = java_lang_reflect_Method::return_type(method_mirror); 1141 BasicType rtype; 1142 if (java_lang_Class::is_primitive(return_type_mirror)) { 1143 rtype = basic_type_mirror_to_basic_type(return_type_mirror); 1144 } else { 1145 rtype = T_OBJECT; 1146 } 1147 1148 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1149 Method* m = klass->method_with_idnum(slot); 1150 if (m == nullptr) { 1151 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke"); 1152 } 1153 methodHandle method(THREAD, m); 1154 1155 return invoke(klass, method, receiver, override, ptypes, rtype, args, true, THREAD); 1156 } 1157 1158 1159 oop Reflection::invoke_constructor(oop constructor_mirror, objArrayHandle args, TRAPS) { 1160 oop mirror = java_lang_reflect_Constructor::clazz(constructor_mirror); 1161 int slot = java_lang_reflect_Constructor::slot(constructor_mirror); 1162 bool override = java_lang_reflect_Constructor::override(constructor_mirror) != 0; 1163 objArrayHandle ptypes(THREAD, objArrayOop(java_lang_reflect_Constructor::parameter_types(constructor_mirror))); 1164 1165 InstanceKlass* klass = InstanceKlass::cast(java_lang_Class::as_Klass(mirror)); 1166 Method* m = klass->method_with_idnum(slot); 1167 if (m == nullptr) { 1168 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "invoke"); 1169 } 1170 methodHandle method(THREAD, m); 1171 1172 // Make sure klass gets initialize 1173 klass->initialize(CHECK_NULL); 1174 1175 // Create new instance (the receiver) 1176 klass->check_valid_for_instantiation(false, CHECK_NULL); 1177 Handle receiver = klass->allocate_instance_handle(CHECK_NULL); 1178 1179 // Ignore result from call and return receiver 1180 invoke(klass, method, receiver, override, ptypes, T_VOID, args, false, CHECK_NULL); 1181 return receiver(); 1182 }