jdk8-mips64-public/hotspot: src/share/vm/ci/ciObjArrayKlass.cpp@4ce7240d622c

     1 /*

     2  * Copyright 1999-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_ciObjArrayKlass.cpp.incl"

    28 // ciObjArrayKlass

    29 //

    30 // This class represents a klassOop in the HotSpot virtual machine

    31 // whose Klass part is an objArrayKlass.

    33 // ------------------------------------------------------------------

    34 // ciObjArrayKlass::ciObjArrayKlass

    35 //

    36 // Constructor for loaded object array klasses.

    37 ciObjArrayKlass::ciObjArrayKlass(KlassHandle h_k) : ciArrayKlass(h_k) {

    38   assert(get_Klass()->oop_is_objArray(), "wrong type");

    39   klassOop element_klassOop = get_objArrayKlass()->bottom_klass();

    40   _base_element_klass = CURRENT_ENV->get_object(element_klassOop)->as_klass();

    41   assert(_base_element_klass->is_instance_klass() ||

    42          _base_element_klass->is_type_array_klass(), "bad base klass");

    43   if (dimension() == 1) {

    44     _element_klass = _base_element_klass;

    45   } else {

    46     _element_klass = NULL;

    47   }

    48   if (!ciObjectFactory::is_initialized()) {

    49     assert(_element_klass->is_java_lang_Object(), "only arrays of object are shared");

    50   }

    51 }

    53 // ------------------------------------------------------------------

    54 // ciObjArrayKlass::ciObjArrayKlass

    55 //

    56 // Constructor for unloaded object array klasses.

    57 ciObjArrayKlass::ciObjArrayKlass(ciSymbol* array_name,

    58                                  ciKlass* base_element_klass,

    59                                  int dimension)

    60   : ciArrayKlass(array_name,

    61                  dimension,

    62                  ciObjArrayKlassKlass::make()) {

    63     _base_element_klass = base_element_klass;

    64     assert(_base_element_klass->is_instance_klass() ||

    65            _base_element_klass->is_type_array_klass(), "bad base klass");

    66     if (dimension == 1) {

    67       _element_klass = base_element_klass;

    68     } else {

    69       _element_klass = NULL;

    70     }

    71 }

    73 // ------------------------------------------------------------------

    74 // ciObjArrayKlass::element_klass

    75 //

    76 // What is the one-level element type of this array?

    77 ciKlass* ciObjArrayKlass::element_klass() {

    78   if (_element_klass == NULL) {

    79     assert(dimension() > 1, "_element_klass should not be NULL");

    80     // Produce the element klass.

    81     if (is_loaded()) {

    82       VM_ENTRY_MARK;

    83       klassOop element_klassOop = get_objArrayKlass()->element_klass();

    84       _element_klass = CURRENT_THREAD_ENV->get_object(element_klassOop)->as_klass();

    85     } else {

    86       VM_ENTRY_MARK;

    87       // We are an unloaded array klass.  Attempt to fetch our

    88       // element klass by name.

    89       _element_klass = CURRENT_THREAD_ENV->get_klass_by_name_impl(

    90                           this,

    91                           construct_array_name(base_element_klass()->name(),

    92                                                dimension() - 1),

    93                           false);

    94     }

    95   }

    96   return _element_klass;

    97 }

    99 // ------------------------------------------------------------------

   100 // ciObjArrayKlass::construct_array_name

   101 //

   102 // Build an array name from an element name and a dimension.

   103 ciSymbol* ciObjArrayKlass::construct_array_name(ciSymbol* element_name,

   104                                                 int dimension) {

   105   EXCEPTION_CONTEXT;

   106   int element_len = element_name->utf8_length();

   108   symbolOop base_name_sym = element_name->get_symbolOop();

   109   char* name;

   111   if (base_name_sym->byte_at(0) == '[' ||

   112       (base_name_sym->byte_at(0) == 'L' &&  // watch package name 'Lxx'

   113        base_name_sym->byte_at(element_len-1) == ';')) {

   115     int new_len = element_len + dimension + 1; // for the ['s and '\0'

   116     name = CURRENT_THREAD_ENV->name_buffer(new_len);

   118     int pos = 0;

   119     for ( ; pos < dimension; pos++) {

   120       name[pos] = '[';

   121     }

   122     strncpy(name+pos, (char*)element_name->base(), element_len);

   123     name[new_len-1] = '\0';

   124   } else {

   125     int new_len =   3                       // for L, ;, and '\0'

   126                   + dimension               // for ['s

   127                   + element_len;

   129     name = CURRENT_THREAD_ENV->name_buffer(new_len);

   130     int pos = 0;

   131     for ( ; pos < dimension; pos++) {

   132       name[pos] = '[';

   133     }

   134     name[pos++] = 'L';

   135     strncpy(name+pos, (char*)element_name->base(), element_len);

   136     name[new_len-2] = ';';

   137     name[new_len-1] = '\0';

   138   }

   139   return ciSymbol::make(name);

   140 }

   142 // ------------------------------------------------------------------

   143 // ciObjArrayKlass::make_impl

   144 //

   145 // Implementation of make.

   146 ciObjArrayKlass* ciObjArrayKlass::make_impl(ciKlass* element_klass) {

   148   if (element_klass->is_loaded()) {

   149     EXCEPTION_CONTEXT;

   150     // The element klass is loaded

   151     klassOop array = element_klass->get_Klass()->array_klass(THREAD);

   152     if (HAS_PENDING_EXCEPTION) {

   153       CLEAR_PENDING_EXCEPTION;

   154       CURRENT_THREAD_ENV->record_out_of_memory_failure();

   155       return ciEnv::unloaded_ciobjarrayklass();

   156     }

   157     return CURRENT_THREAD_ENV->get_object(array)->as_obj_array_klass();

   158   }

   160   // The array klass was unable to be made or the element klass was

   161   // not loaded.

   162   ciSymbol* array_name = construct_array_name(element_klass->name(), 1);

   163   if (array_name == ciEnv::unloaded_cisymbol()) {

   164     return ciEnv::unloaded_ciobjarrayklass();

   165   }

   166   return

   167     CURRENT_ENV->get_unloaded_klass(element_klass, array_name)

   168                         ->as_obj_array_klass();

   169 }

   171 // ------------------------------------------------------------------

   172 // ciObjArrayKlass::make

   173 //

   174 // Make an array klass corresponding to the specified primitive type.

   175 ciObjArrayKlass* ciObjArrayKlass::make(ciKlass* element_klass) {

   176   assert(element_klass->is_java_klass(), "wrong kind of klass");

   177   GUARDED_VM_ENTRY(return make_impl(element_klass);)

   178 }

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