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