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annotate src/share/vm/code/vtableStubs.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | 126ea7725993 |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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 | |
| 45 VtableStub(bool is_vtable_stub, int index) | |
| 46 : _next(NULL), _is_vtable_stub(is_vtable_stub), | |
| 47 _index(index), _ame_offset(-1), _npe_offset(-1) {} | |
| 48 VtableStub* next() const { return _next; } | |
| 49 int index() const { return _index; } | |
| 50 static VMReg receiver_location() { return _receiver_location; } | |
| 51 void set_next(VtableStub* n) { _next = n; } | |
| 52 address code_begin() const { return (address)(this + 1); } | |
| 53 address code_end() const { return code_begin() + pd_code_size_limit(_is_vtable_stub); } | |
| 54 address entry_point() const { return code_begin(); } | |
| 55 static int entry_offset() { return sizeof(class VtableStub); } | |
| 56 | |
| 57 bool matches(bool is_vtable_stub, int index) const { | |
| 58 return _index == index && _is_vtable_stub == is_vtable_stub; | |
| 59 } | |
| 60 bool contains(address pc) const { return code_begin() <= pc && pc < code_end(); } | |
| 61 | |
| 62 void set_exception_points(address npe_addr, address ame_addr) { | |
| 63 _npe_offset = npe_addr - code_begin(); | |
| 64 _ame_offset = ame_addr - code_begin(); | |
| 65 assert(is_abstract_method_error(ame_addr), "offset must be correct"); | |
| 66 assert(is_null_pointer_exception(npe_addr), "offset must be correct"); | |
| 67 assert(!is_abstract_method_error(npe_addr), "offset must be correct"); | |
| 68 assert(!is_null_pointer_exception(ame_addr), "offset must be correct"); | |
| 69 } | |
| 70 | |
| 71 // platform-dependent routines | |
| 72 static int pd_code_size_limit(bool is_vtable_stub); | |
| 73 static int pd_code_alignment(); | |
| 74 // CNC: Removed because vtable stubs are now made with an ideal graph | |
| 75 // static bool pd_disregard_arg_size(); | |
| 76 | |
| 77 static void align_chunk() { | |
| 78 uintptr_t off = (uintptr_t)( _chunk + sizeof(VtableStub) ) % pd_code_alignment(); | |
| 79 if (off != 0) _chunk += pd_code_alignment() - off; | |
| 80 } | |
| 81 | |
| 82 public: | |
| 83 // Query | |
| 84 bool is_itable_stub() { return !_is_vtable_stub; } | |
| 85 bool is_vtable_stub() { return _is_vtable_stub; } | |
| 86 bool is_abstract_method_error(address epc) { return epc == code_begin()+_ame_offset; } | |
| 87 bool is_null_pointer_exception(address epc) { return epc == code_begin()+_npe_offset; } | |
| 88 | |
| 89 void print(); | |
| 90 }; | |
| 91 | |
| 92 | |
| 93 // VtableStubs creates the code stubs for compiled calls through vtables. | |
| 94 // There is one stub per (vtable index, args_size) pair, and the stubs are | |
| 95 // never deallocated. They don't need to be GCed because they contain no oops. | |
| 96 | |
| 97 class VtableStubs : AllStatic { | |
| 98 public: // N must be public (some compilers need this for _table) | |
| 99 enum { | |
| 100 N = 256, // size of stub table; must be power of two | |
| 101 mask = N - 1 | |
| 102 }; | |
| 103 | |
| 104 private: | |
| 105 static VtableStub* _table[N]; // table of existing stubs | |
| 106 static int _number_of_vtable_stubs; // number of stubs created so far (for statistics) | |
| 107 | |
| 108 static VtableStub* create_vtable_stub(int vtable_index); | |
| 109 static VtableStub* create_itable_stub(int vtable_index); | |
| 110 static VtableStub* lookup (bool is_vtable_stub, int vtable_index); | |
| 111 static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s); | |
| 112 static inline uint hash (bool is_vtable_stub, int vtable_index); | |
| 113 | |
| 114 public: | |
| 115 static address create_stub(bool is_vtable_stub, int vtable_index, methodOop method); // return the entry point of a stub for this call | |
| 116 static bool is_entry_point(address pc); // is pc a vtable stub entry point? | |
| 117 static bool contains(address pc); // is pc within any stub? | |
| 118 static VtableStub* stub_containing(address pc); // stub containing pc or NULL | |
| 119 static int number_of_vtable_stubs() { return _number_of_vtable_stubs; } | |
| 120 static void initialize(); | |
| 121 }; |