jdk8-mips64-public/hotspot: src/share/vm/oops/objArrayKlassKlass.cpp@fc9d8850ab8b

7150058: Allocate symbols from null boot loader to an arena for NMT
Summary: Move symbol allocation to an arena so NMT doesn't have to track them at startup.
Reviewed-by: never, kamg, zgu

     1 /*

     2  * Copyright (c) 1997, 2012, 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  */

    25 #include "precompiled.hpp"

    26 #include "classfile/javaClasses.hpp"

    27 #include "classfile/systemDictionary.hpp"

    28 #include "gc_implementation/shared/markSweep.inline.hpp"

    29 #include "gc_interface/collectedHeap.inline.hpp"

    30 #include "oops/instanceKlass.hpp"

    31 #include "oops/objArrayKlassKlass.hpp"

    32 #include "oops/oop.inline.hpp"

    33 #include "oops/oop.inline2.hpp"

    34 #ifndef SERIALGC

    35 #include "gc_implementation/parNew/parOopClosures.inline.hpp"

    36 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"

    37 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"

    38 #include "memory/cardTableRS.hpp"

    39 #include "oops/oop.pcgc.inline.hpp"

    40 #endif

    42 klassOop objArrayKlassKlass::create_klass(TRAPS) {

    43   objArrayKlassKlass o;

    44   KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());

    45   KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_0);

    46   assert(k()->size() == align_object_size(header_size()), "wrong size for object");

    47   java_lang_Class::create_mirror(k, CHECK_0); // Allocate mirror

    48   return k();

    49 }

    51 klassOop objArrayKlassKlass::allocate_system_objArray_klass(TRAPS) {

    52   // system_objArrays have no instance klass, so allocate with fake class, then reset to NULL

    53   KlassHandle kk(THREAD, Universe::intArrayKlassObj());

    54   klassOop k = allocate_objArray_klass(1, kk, CHECK_0);

    55   objArrayKlass* tk = (objArrayKlass*) k->klass_part();

    56   tk->set_element_klass(NULL);

    57   tk->set_bottom_klass(NULL);

    58   return k;

    59 }

    62 klassOop objArrayKlassKlass::allocate_objArray_klass(int n, KlassHandle element_klass, TRAPS) {

    63   objArrayKlassKlassHandle this_oop(THREAD, as_klassOop());

    64   return allocate_objArray_klass_impl(this_oop, n, element_klass, THREAD);

    65 }

    67 klassOop objArrayKlassKlass::allocate_objArray_klass_impl(objArrayKlassKlassHandle this_oop,

    68                                                           int n, KlassHandle element_klass, TRAPS) {

    70   // Eagerly allocate the direct array supertype.

    71   KlassHandle super_klass = KlassHandle();

    72   if (!Universe::is_bootstrapping()) {

    73     KlassHandle element_super (THREAD, element_klass->super());

    74     if (element_super.not_null()) {

    75       // The element type has a direct super.  E.g., String[] has direct super of Object[].

    76       super_klass = KlassHandle(THREAD, element_super->array_klass_or_null());

    77       bool supers_exist = super_klass.not_null();

    78       // Also, see if the element has secondary supertypes.

    79       // We need an array type for each.

    80       objArrayHandle element_supers = objArrayHandle(THREAD,

    81                                             element_klass->secondary_supers());

    82       for( int i = element_supers->length()-1; i >= 0; i-- ) {

    83         klassOop elem_super = (klassOop) element_supers->obj_at(i);

    84         if (Klass::cast(elem_super)->array_klass_or_null() == NULL) {

    85           supers_exist = false;

    86           break;

    87         }

    88       }

    89       if (!supers_exist) {

    90         // Oops.  Not allocated yet.  Back out, allocate it, and retry.

    91 #ifndef PRODUCT

    92         if (WizardMode) {

    93           tty->print_cr("Must retry array klass creation for depth %d",n);

    94         }

    95 #endif

    96         KlassHandle ek;

    97         {

    98           MutexUnlocker mu(MultiArray_lock);

    99           MutexUnlocker mc(Compile_lock);   // for vtables

   100           klassOop sk = element_super->array_klass(CHECK_0);

   101           super_klass = KlassHandle(THREAD, sk);

   102           for( int i = element_supers->length()-1; i >= 0; i-- ) {

   103             KlassHandle elem_super (THREAD, element_supers->obj_at(i));

   104             elem_super->array_klass(CHECK_0);

   105           }

   106           // Now retry from the beginning

   107           klassOop klass_oop = element_klass->array_klass(n, CHECK_0);

   108           // Create a handle because the enclosing brace, when locking

   109           // can cause a gc.  Better to have this function return a Handle.

   110           ek = KlassHandle(THREAD, klass_oop);

   111         }  // re-lock

   112         return ek();

   113       }

   114     } else {

   115       // The element type is already Object.  Object[] has direct super of Object.

   116       super_klass = KlassHandle(THREAD, SystemDictionary::Object_klass());

   117     }

   118   }

   120   // Create type name for klass.

   121   Symbol* name = NULL;

   122   if (!element_klass->oop_is_instance() ||

   123       (name = instanceKlass::cast(element_klass())->array_name()) == NULL) {

   125     ResourceMark rm(THREAD);

   126     char *name_str = element_klass->name()->as_C_string();

   127     int len = element_klass->name()->utf8_length();

   128     char *new_str = NEW_RESOURCE_ARRAY(char, len + 4);

   129     int idx = 0;

   130     new_str[idx++] = '[';

   131     if (element_klass->oop_is_instance()) { // it could be an array or simple type

   132       new_str[idx++] = 'L';

   133     }

   134     memcpy(&new_str[idx], name_str, len * sizeof(char));

   135     idx += len;

   136     if (element_klass->oop_is_instance()) {

   137       new_str[idx++] = ';';

   138     }

   139     new_str[idx++] = '\0';

   140     name = SymbolTable::new_permanent_symbol(new_str, CHECK_0);

   141     if (element_klass->oop_is_instance()) {

   142       instanceKlass* ik = instanceKlass::cast(element_klass());

   143       ik->set_array_name(name);

   144     }

   145   }

   147   objArrayKlass o;

   148   arrayKlassHandle k = arrayKlass::base_create_array_klass(o.vtbl_value(),

   149                                                            objArrayKlass::header_size(),

   150                                                           this_oop,

   151                                                            CHECK_0);

   153   // Initialize instance variables

   154   objArrayKlass* oak = objArrayKlass::cast(k());

   155   oak->set_dimension(n);

   156   oak->set_element_klass(element_klass());

   157   oak->set_name(name);

   158   // decrement refcount because object arrays are not explicitly freed.  The

   159   // instanceKlass array_name() keeps the name counted while the klass is

   160   // loaded.

   161   name->decrement_refcount();

   163   klassOop bk;

   164   if (element_klass->oop_is_objArray()) {

   165     bk = objArrayKlass::cast(element_klass())->bottom_klass();

   166   } else {

   167     bk = element_klass();

   168   }

   169   assert(bk != NULL && (Klass::cast(bk)->oop_is_instance() || Klass::cast(bk)->oop_is_typeArray()), "invalid bottom klass");

   170   oak->set_bottom_klass(bk);

   172   oak->set_layout_helper(array_layout_helper(T_OBJECT));

   173   assert(oak->oop_is_javaArray(), "sanity");

   174   assert(oak->oop_is_objArray(), "sanity");

   176   // Call complete_create_array_klass after all instance variables has been initialized.

   177   arrayKlass::complete_create_array_klass(k, super_klass, CHECK_0);

   179   return k();

   180 }

   183 void objArrayKlassKlass::oop_follow_contents(oop obj) {

   184   assert(obj->is_klass(), "must be klass");

   185   assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");

   187   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   188   MarkSweep::mark_and_push(oak->element_klass_addr());

   189   MarkSweep::mark_and_push(oak->bottom_klass_addr());

   191   arrayKlassKlass::oop_follow_contents(obj);

   192 }

   194 #ifndef SERIALGC

   195 void objArrayKlassKlass::oop_follow_contents(ParCompactionManager* cm,

   196                                              oop obj) {

   197   assert(obj->is_klass(), "must be klass");

   198   assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");

   200   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   201   PSParallelCompact::mark_and_push(cm, oak->element_klass_addr());

   202   PSParallelCompact::mark_and_push(cm, oak->bottom_klass_addr());

   204   arrayKlassKlass::oop_follow_contents(cm, obj);

   205 }

   206 #endif // SERIALGC

   209 int objArrayKlassKlass::oop_adjust_pointers(oop obj) {

   210   assert(obj->is_klass(), "must be klass");

   211   assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");

   213   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   214   MarkSweep::adjust_pointer(oak->element_klass_addr());

   215   MarkSweep::adjust_pointer(oak->bottom_klass_addr());

   217   return arrayKlassKlass::oop_adjust_pointers(obj);

   218 }

   222 int objArrayKlassKlass::oop_oop_iterate(oop obj, OopClosure* blk) {

   223   assert(obj->is_klass(), "must be klass");

   224   assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");

   226   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   227   blk->do_oop(oak->element_klass_addr());

   228   blk->do_oop(oak->bottom_klass_addr());

   230   return arrayKlassKlass::oop_oop_iterate(obj, blk);

   231 }

   234 int

   235 objArrayKlassKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {

   236   assert(obj->is_klass(), "must be klass");

   237   assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");

   239   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   240   oop* addr;

   241   addr = oak->element_klass_addr();

   242   if (mr.contains(addr)) blk->do_oop(addr);

   243   addr = oak->bottom_klass_addr();

   244   if (mr.contains(addr)) blk->do_oop(addr);

   246   return arrayKlassKlass::oop_oop_iterate_m(obj, blk, mr);

   247 }

   249 #ifndef SERIALGC

   250 void objArrayKlassKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {

   251   assert(obj->blueprint()->oop_is_objArrayKlass(),"must be an obj array klass");

   252   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   253   oop* p = oak->element_klass_addr();

   254   if (PSScavenge::should_scavenge(p)) {

   255     pm->claim_or_forward_depth(p);

   256   }

   257   p = oak->bottom_klass_addr();

   258   if (PSScavenge::should_scavenge(p)) {

   259     pm->claim_or_forward_depth(p);

   260   }

   262   arrayKlassKlass::oop_push_contents(pm, obj);

   263 }

   265 int objArrayKlassKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {

   266   assert(obj->is_klass(), "must be klass");

   267   assert(klassOop(obj)->klass_part()->oop_is_objArray_slow(), "must be obj array");

   269   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   270   PSParallelCompact::adjust_pointer(oak->element_klass_addr());

   271   PSParallelCompact::adjust_pointer(oak->bottom_klass_addr());

   273   return arrayKlassKlass::oop_update_pointers(cm, obj);

   274 }

   275 #endif // SERIALGC

   277 #ifndef PRODUCT

   279 // Printing

   281 void objArrayKlassKlass::oop_print_on(oop obj, outputStream* st) {

   282   assert(obj->is_klass(), "must be klass");

   283   objArrayKlass* oak = (objArrayKlass*) klassOop(obj)->klass_part();

   284   klassKlass::oop_print_on(obj, st);

   285   st->print(" - instance klass: ");

   286   oak->element_klass()->print_value_on(st);

   287   st->cr();

   288 }

   290 #endif //PRODUCT

   292 void objArrayKlassKlass::oop_print_value_on(oop obj, outputStream* st) {

   293   assert(obj->is_klass(), "must be klass");

   294   objArrayKlass* oak = (objArrayKlass*) klassOop(obj)->klass_part();

   296   oak->element_klass()->print_value_on(st);

   297   st->print("[]");

   298 }

   300 const char* objArrayKlassKlass::internal_name() const {

   301   return "{object array class}";

   302 }

   305 // Verification

   307 void objArrayKlassKlass::oop_verify_on(oop obj, outputStream* st) {

   308   arrayKlassKlass::oop_verify_on(obj, st);

   309   objArrayKlass* oak = objArrayKlass::cast((klassOop)obj);

   310   guarantee(oak->element_klass()->is_perm(),  "should be in permspace");

   311   guarantee(oak->element_klass()->is_klass(), "should be klass");

   312   guarantee(oak->bottom_klass()->is_perm(),   "should be in permspace");

   313   guarantee(oak->bottom_klass()->is_klass(),  "should be klass");

   314   Klass* bk = Klass::cast(oak->bottom_klass());

   315   guarantee(bk->oop_is_instance() || bk->oop_is_typeArray(),  "invalid bottom klass");

   316 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/oops/objArrayKlassKlass.cpp@fc9d8850ab8b

src/share/vm/oops/objArrayKlassKlass.cpp