1 /*

     2  * Copyright (c) 2017, 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 #ifndef SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP

    26 #define SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP

    27 

    28 #include "oops/symbol.hpp"

    29 #include "utilities/hashtable.hpp"

    30 

    31 // Hashtable to record Method* used in ResolvedMethods, via. ResolvedMethod oops.

    32 // This is needed for redefinition to replace Method* with redefined versions.

    33 

    34 // Entry in a ResolvedMethodTable, mapping a single oop of java_lang_invoke_ResolvedMethodName which

    35 // holds JVM Method* in vmtarget.

    36 

    37 class ResolvedMethodEntry : public HashtableEntry<oop, mtClass> {

    38  public:

    39   ResolvedMethodEntry* next() const {

    40     return (ResolvedMethodEntry*)HashtableEntry<oop, mtClass>::next();

    41   }

    42 

    43   ResolvedMethodEntry** next_addr() {

    44     return (ResolvedMethodEntry**)HashtableEntry<oop, mtClass>::next_addr();

    45   }

    46 

    47   void print_on(outputStream* st) const;

    48 };

    49 

    50 class ResolvedMethodTable : public Hashtable<oop, mtClass> {

    51   enum Constants {

    52     _table_size  = 1007

    53   };

    54 

    55   static int _oops_removed;

    56   static int _oops_counted;

    57 

    58   static ResolvedMethodTable* _the_table;

    59 private:

    60   ResolvedMethodEntry* bucket(int i) {

    61     return (ResolvedMethodEntry*) Hashtable<oop, mtClass>::bucket(i);

    62   }

    63 

    64   ResolvedMethodEntry** bucket_addr(int i) {

    65     return (ResolvedMethodEntry**) Hashtable<oop, mtClass>::bucket_addr(i);

    66   }

    67 

    68   unsigned int compute_hash(Method* method);

    69 

    70   // need not be locked; no state change

    71   oop lookup(int index, unsigned int hash, Method* method);

    72   oop lookup(Method* method);

    73 

    74   // must be done under ResolvedMethodTable_lock

    75   oop basic_add(Method* method, oop rmethod_name);

    76 

    77 public:

    78   ResolvedMethodTable();

    79 

    80   static void create_table() {

    81     assert(_the_table == NULL, "One symbol table allowed.");

    82     _the_table = new ResolvedMethodTable();

    83   }

    84 

    85   // Called from java_lang_invoke_ResolvedMethodName

    86   static oop find_method(Method* method);

    87   static oop add_method(Handle rmethod_name);

    88 

    89 #if INCLUDE_JVMTI

    90   // It is called at safepoint only for RedefineClasses

    91   static void adjust_method_entries(bool * trace_name_printed);

    92 #endif // INCLUDE_JVMTI

    93 

    94   // Cleanup cleared entries

    95   static void unlink(BoolObjectClosure* is_alive);

    96   static void oops_do(OopClosure* f);

    97 

    98 #ifndef PRODUCT

    99   void print();

   100 #endif

   101   void verify();

   102 };

   103 

   104 #endif // SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP