1 /*
2 * Copyright (c) 1997, 2006, 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 // A VtableStub holds an individual code stub for a pair (vtable index, #args) for either itables or vtables
26 // There's a one-to-one relationship between a VtableStub and such a pair.
27
28 class VtableStub {
29 private:
30 friend class VtableStubs;
31
32 static address _chunk; // For allocation
33 static address _chunk_end; // For allocation
34 static VMReg _receiver_location; // Where to find receiver
35
36 VtableStub* _next; // Pointer to next entry in hash table
37 const short _index; // vtable index
38 short _ame_offset; // Where an AbstractMethodError might occur
39 short _npe_offset; // Where a NullPointerException might occur
40 bool _is_vtable_stub; // True if vtable stub, false, is itable stub
41 /* code follows here */ // The vtableStub code
42
43 void* operator new(size_t size, int code_size);
44
104 };
105
106 private:
107 static VtableStub* _table[N]; // table of existing stubs
108 static int _number_of_vtable_stubs; // number of stubs created so far (for statistics)
109
110 static VtableStub* create_vtable_stub(int vtable_index);
111 static VtableStub* create_itable_stub(int vtable_index);
112 static VtableStub* lookup (bool is_vtable_stub, int vtable_index);
113 static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s);
114 static inline uint hash (bool is_vtable_stub, int vtable_index);
115
116 public:
117 static address create_stub(bool is_vtable_stub, int vtable_index, methodOop method); // return the entry point of a stub for this call
118 static bool is_entry_point(address pc); // is pc a vtable stub entry point?
119 static bool contains(address pc); // is pc within any stub?
120 static VtableStub* stub_containing(address pc); // stub containing pc or NULL
121 static int number_of_vtable_stubs() { return _number_of_vtable_stubs; }
122 static void initialize();
123 };
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1 /*
2 * Copyright (c) 1997, 2010, 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_CODE_VTABLESTUBS_HPP
26 #define SHARE_VM_CODE_VTABLESTUBS_HPP
27
28 #include "memory/allocation.hpp"
29
30 // A VtableStub holds an individual code stub for a pair (vtable index, #args) for either itables or vtables
31 // There's a one-to-one relationship between a VtableStub and such a pair.
32
33 class VtableStub {
34 private:
35 friend class VtableStubs;
36
37 static address _chunk; // For allocation
38 static address _chunk_end; // For allocation
39 static VMReg _receiver_location; // Where to find receiver
40
41 VtableStub* _next; // Pointer to next entry in hash table
42 const short _index; // vtable index
43 short _ame_offset; // Where an AbstractMethodError might occur
44 short _npe_offset; // Where a NullPointerException might occur
45 bool _is_vtable_stub; // True if vtable stub, false, is itable stub
46 /* code follows here */ // The vtableStub code
47
48 void* operator new(size_t size, int code_size);
49
109 };
110
111 private:
112 static VtableStub* _table[N]; // table of existing stubs
113 static int _number_of_vtable_stubs; // number of stubs created so far (for statistics)
114
115 static VtableStub* create_vtable_stub(int vtable_index);
116 static VtableStub* create_itable_stub(int vtable_index);
117 static VtableStub* lookup (bool is_vtable_stub, int vtable_index);
118 static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s);
119 static inline uint hash (bool is_vtable_stub, int vtable_index);
120
121 public:
122 static address create_stub(bool is_vtable_stub, int vtable_index, methodOop method); // return the entry point of a stub for this call
123 static bool is_entry_point(address pc); // is pc a vtable stub entry point?
124 static bool contains(address pc); // is pc within any stub?
125 static VtableStub* stub_containing(address pc); // stub containing pc or NULL
126 static int number_of_vtable_stubs() { return _number_of_vtable_stubs; }
127 static void initialize();
128 };
129
130 #endif // SHARE_VM_CODE_VTABLESTUBS_HPP
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