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 }