jdk8-mips64-public/hotspot: src/share/vm/ci/ciKlass.hpp@2c6ef90f030a

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

     1 /*

     2  * Copyright (c) 1999, 2013, 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

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    23  */

    25 #ifndef SHARE_VM_CI_CIKLASS_HPP

    26 #define SHARE_VM_CI_CIKLASS_HPP

    28 #include "ci/ciType.hpp"

    30 // ciKlass

    31 //

    32 // This class and its subclasses represent Klass*s in the

    33 // HotSpot virtual machine.  In the vm, each Klass* contains an

    34 // embedded Klass object.  ciKlass is subclassed to explicitly

    35 // represent the kind of Klass embedded in the Klass*.  For

    36 // example, a Klass* with an embedded ObjArrayKlass object is

    37 // represented in the ciObject hierarchy by the class

    38 // ciObjArrayKlass.

    39 class ciKlass : public ciType {

    40   CI_PACKAGE_ACCESS

    41   friend class ciEnv;

    42   friend class ciField;

    43   friend class ciMethod;

    44   friend class ciMethodData;

    45   friend class ciObjArrayKlass;

    46   friend class ciReceiverTypeData;

    48 private:

    49   ciSymbol* _name;

    50   jint _layout_helper;

    52 protected:

    53   ciKlass(KlassHandle k_h, ciSymbol* name);

    54   ciKlass(ciSymbol* name, BasicType bt);

    56   Klass* get_Klass() const {

    57     Klass* k = (Klass*)_metadata;

    58     assert(k != NULL, "illegal use of unloaded klass");

    59     return k;

    60   }

    62   // Certain subklasses have an associated class loader.

    63   virtual oop loader()             { return NULL; }

    64   virtual jobject loader_handle()  { return NULL; }

    66   virtual oop protection_domain()             { return NULL; }

    67   virtual jobject protection_domain_handle()  { return NULL; }

    69   const char* type_string() { return "ciKlass"; }

    71   void print_impl(outputStream* st);

    73 public:

    74   ciKlass(KlassHandle k_h);

    76   // What is the name of this klass?

    77   ciSymbol* name() const { return _name; }

    79   // What is its layout helper value?

    80   jint layout_helper() { return _layout_helper; }

    82   bool is_subtype_of(ciKlass* klass);

    83   bool is_subclass_of(ciKlass* klass);

    84   juint super_depth();

    85   juint super_check_offset();

    86   ciKlass* super_of_depth(juint i);

    87   bool can_be_primary_super();

    88   static juint primary_super_limit() { return Klass::primary_super_limit(); }

    90   // Is this ciObject the ciInstanceKlass representing java.lang.Object()?

    91   virtual bool is_java_lang_Object() const  { return false; }

    93   // Get the shared parent of two klasses.

    94   ciKlass* least_common_ancestor(ciKlass* k);

    96   virtual bool is_interface() {

    97     return false;

    98   }

   100   virtual bool is_abstract() {

   101     return false;

   102   }

   104   // Does this type (array, class, interface) have no subtypes?

   105   virtual bool is_leaf_type() {

   106     return false;

   107   }

   109   // Attempt to get a klass using this ciKlass's loader.

   110   ciKlass* find_klass(ciSymbol* klass_name);

   111   // Note:  To find a class from its name string, use ciSymbol::make,

   112   // but consider adding to vmSymbols.hpp instead.

   114   // Get the instance of java.lang.Class corresponding to this klass.

   115   ciInstance*            java_mirror();

   117   // Fetch Klass::modifier_flags.

   118   jint                   modifier_flags();

   120   // Fetch Klass::access_flags.

   121   jint                   access_flags();

   123   // What kind of ciObject is this?

   124   bool is_klass() const { return true; }

   126   virtual ciKlass* exact_klass() = 0;

   128   void print_name_on(outputStream* st);

   129 };

   131 #endif // SHARE_VM_CI_CIKLASS_HPP

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

src/share/vm/ci/ciKlass.hpp@2c6ef90f030a

src/share/vm/ci/ciKlass.hpp