src/hotspot/share/code/vtableStubs.hpp

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   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  *


 109  public:                                         // N must be public (some compilers need this for _table)
 110   enum {
 111     N    = 256,                                  // size of stub table; must be power of two
 112     mask = N - 1
 113   };
 114 
 115  private:
 116   static VtableStub* _table[N];                  // table of existing stubs
 117   static int         _number_of_vtable_stubs;    // number of stubs created so far (for statistics)
 118 
 119   static VtableStub* create_vtable_stub(int vtable_index);
 120   static VtableStub* create_itable_stub(int vtable_index);
 121   static VtableStub* lookup            (bool is_vtable_stub, int vtable_index);
 122   static void        enter             (bool is_vtable_stub, int vtable_index, VtableStub* s);
 123   static inline uint hash              (bool is_vtable_stub, int vtable_index);
 124   static address     find_stub         (bool is_vtable_stub, int vtable_index);
 125 
 126  public:
 127   static address     find_vtable_stub(int vtable_index) { return find_stub(true,  vtable_index); }
 128   static address     find_itable_stub(int itable_index) { return find_stub(false, itable_index); }
 129   static bool        is_entry_point(address pc);                     // is pc a vtable stub entry point?
 130   static bool        contains(address pc);                           // is pc within any stub?
 131   static VtableStub* stub_containing(address pc);                    // stub containing pc or NULL
 132   static int         number_of_vtable_stubs() { return _number_of_vtable_stubs; }
 133   static void        initialize();
 134   static void        vtable_stub_do(void f(VtableStub*));            // iterates over all vtable stubs
 135 };
 136 
 137 #endif // SHARE_VM_CODE_VTABLESTUBS_HPP
   1 /*
   2  * Copyright (c) 1997, 2018, 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  *


 109  public:                                         // N must be public (some compilers need this for _table)
 110   enum {
 111     N    = 256,                                  // size of stub table; must be power of two
 112     mask = N - 1
 113   };
 114 
 115  private:
 116   static VtableStub* _table[N];                  // table of existing stubs
 117   static int         _number_of_vtable_stubs;    // number of stubs created so far (for statistics)
 118 
 119   static VtableStub* create_vtable_stub(int vtable_index);
 120   static VtableStub* create_itable_stub(int vtable_index);
 121   static VtableStub* lookup            (bool is_vtable_stub, int vtable_index);
 122   static void        enter             (bool is_vtable_stub, int vtable_index, VtableStub* s);
 123   static inline uint hash              (bool is_vtable_stub, int vtable_index);
 124   static address     find_stub         (bool is_vtable_stub, int vtable_index);
 125 
 126  public:
 127   static address     find_vtable_stub(int vtable_index) { return find_stub(true,  vtable_index); }
 128   static address     find_itable_stub(int itable_index) { return find_stub(false, itable_index); }
 129   static VtableStub* entry_point(address pc);                        // vtable stub entry point for a pc
 130   static bool        contains(address pc);                           // is pc within any stub?
 131   static VtableStub* stub_containing(address pc);                    // stub containing pc or NULL
 132   static int         number_of_vtable_stubs() { return _number_of_vtable_stubs; }
 133   static void        initialize();
 134   static void        vtable_stub_do(void f(VtableStub*));            // iterates over all vtable stubs
 135 };
 136 
 137 #endif // SHARE_VM_CODE_VTABLESTUBS_HPP