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  *

  94 // hash value). Each list is anchored in a little hash _table, indexed
  95 // by that hash value.
  96 
  97 VtableStub* VtableStubs::_table[VtableStubs::N];
  98 int VtableStubs::_number_of_vtable_stubs = 0;
  99 
 100 
 101 void VtableStubs::initialize() {
 102   VtableStub::_receiver_location = SharedRuntime::name_for_receiver();
 103   {
 104     MutexLocker ml(VtableStubs_lock);
 105     assert(_number_of_vtable_stubs == 0, "potential performance bug: VtableStubs initialized more than once");
 106     assert(is_power_of_2(N), "N must be a power of 2");
 107     for (int i = 0; i < N; i++) {
 108       _table[i] = NULL;
 109     }
 110   }
 111 }
 112 
 113 
 114 address VtableStubs::create_stub(bool is_vtable_stub, int vtable_index, Method* method) {
 115   assert(vtable_index >= 0, "must be positive");
 116 
 117   VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL;
 118   if (s == NULL) {
 119     if (is_vtable_stub) {
 120       s = create_vtable_stub(vtable_index);
 121     } else {
 122       s = create_itable_stub(vtable_index);
 123     }
 124     enter(is_vtable_stub, vtable_index, s);
 125     if (PrintAdapterHandlers) {
 126       tty->print_cr("Decoding VtableStub %s[%d]@%d",
 127                     is_vtable_stub? "vtbl": "itbl", vtable_index, VtableStub::receiver_location());
 128       Disassembler::decode(s->code_begin(), s->code_end());
 129     }
 130   }
 131   return s->entry_point();
 132 }
 133 
 134 

   1 /*
   2  * Copyright (c) 1997, 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
  21  * questions.
  22  *

  94 // hash value). Each list is anchored in a little hash _table, indexed
  95 // by that hash value.
  96 
  97 VtableStub* VtableStubs::_table[VtableStubs::N];
  98 int VtableStubs::_number_of_vtable_stubs = 0;
  99 
 100 
 101 void VtableStubs::initialize() {
 102   VtableStub::_receiver_location = SharedRuntime::name_for_receiver();
 103   {
 104     MutexLocker ml(VtableStubs_lock);
 105     assert(_number_of_vtable_stubs == 0, "potential performance bug: VtableStubs initialized more than once");
 106     assert(is_power_of_2(N), "N must be a power of 2");
 107     for (int i = 0; i < N; i++) {
 108       _table[i] = NULL;
 109     }
 110   }
 111 }
 112 
 113 
 114 address VtableStubs::find_stub(bool is_vtable_stub, int vtable_index) {
 115   assert(vtable_index >= 0, "must be positive");
 116 
 117   VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL;
 118   if (s == NULL) {
 119     if (is_vtable_stub) {
 120       s = create_vtable_stub(vtable_index);
 121     } else {
 122       s = create_itable_stub(vtable_index);
 123     }
 124     enter(is_vtable_stub, vtable_index, s);
 125     if (PrintAdapterHandlers) {
 126       tty->print_cr("Decoding VtableStub %s[%d]@%d",
 127                     is_vtable_stub? "vtbl": "itbl", vtable_index, VtableStub::receiver_location());
 128       Disassembler::decode(s->code_begin(), s->code_end());
 129     }
 130   }
 131   return s->entry_point();
 132 }
 133 
 134