Sat, 01 Dec 2007 00:00:00 +0000
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duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // A VtableStub holds an individual code stub for a pair (vtable index, #args) for either itables or vtables |
duke@435 | 26 | // There's a one-to-one relationship between a VtableStub and such a pair. |
duke@435 | 27 | |
duke@435 | 28 | class VtableStub { |
duke@435 | 29 | private: |
duke@435 | 30 | friend class VtableStubs; |
duke@435 | 31 | |
duke@435 | 32 | static address _chunk; // For allocation |
duke@435 | 33 | static address _chunk_end; // For allocation |
duke@435 | 34 | static VMReg _receiver_location; // Where to find receiver |
duke@435 | 35 | |
duke@435 | 36 | VtableStub* _next; // Pointer to next entry in hash table |
duke@435 | 37 | const short _index; // vtable index |
duke@435 | 38 | short _ame_offset; // Where an AbstractMethodError might occur |
duke@435 | 39 | short _npe_offset; // Where a NullPointerException might occur |
duke@435 | 40 | bool _is_vtable_stub; // True if vtable stub, false, is itable stub |
duke@435 | 41 | /* code follows here */ // The vtableStub code |
duke@435 | 42 | |
duke@435 | 43 | void* operator new(size_t size, int code_size); |
duke@435 | 44 | |
duke@435 | 45 | VtableStub(bool is_vtable_stub, int index) |
duke@435 | 46 | : _next(NULL), _is_vtable_stub(is_vtable_stub), |
duke@435 | 47 | _index(index), _ame_offset(-1), _npe_offset(-1) {} |
duke@435 | 48 | VtableStub* next() const { return _next; } |
duke@435 | 49 | int index() const { return _index; } |
duke@435 | 50 | static VMReg receiver_location() { return _receiver_location; } |
duke@435 | 51 | void set_next(VtableStub* n) { _next = n; } |
duke@435 | 52 | address code_begin() const { return (address)(this + 1); } |
duke@435 | 53 | address code_end() const { return code_begin() + pd_code_size_limit(_is_vtable_stub); } |
duke@435 | 54 | address entry_point() const { return code_begin(); } |
duke@435 | 55 | static int entry_offset() { return sizeof(class VtableStub); } |
duke@435 | 56 | |
duke@435 | 57 | bool matches(bool is_vtable_stub, int index) const { |
duke@435 | 58 | return _index == index && _is_vtable_stub == is_vtable_stub; |
duke@435 | 59 | } |
duke@435 | 60 | bool contains(address pc) const { return code_begin() <= pc && pc < code_end(); } |
duke@435 | 61 | |
duke@435 | 62 | void set_exception_points(address npe_addr, address ame_addr) { |
duke@435 | 63 | _npe_offset = npe_addr - code_begin(); |
duke@435 | 64 | _ame_offset = ame_addr - code_begin(); |
duke@435 | 65 | assert(is_abstract_method_error(ame_addr), "offset must be correct"); |
duke@435 | 66 | assert(is_null_pointer_exception(npe_addr), "offset must be correct"); |
duke@435 | 67 | assert(!is_abstract_method_error(npe_addr), "offset must be correct"); |
duke@435 | 68 | assert(!is_null_pointer_exception(ame_addr), "offset must be correct"); |
duke@435 | 69 | } |
duke@435 | 70 | |
duke@435 | 71 | // platform-dependent routines |
duke@435 | 72 | static int pd_code_size_limit(bool is_vtable_stub); |
duke@435 | 73 | static int pd_code_alignment(); |
duke@435 | 74 | // CNC: Removed because vtable stubs are now made with an ideal graph |
duke@435 | 75 | // static bool pd_disregard_arg_size(); |
duke@435 | 76 | |
duke@435 | 77 | static void align_chunk() { |
duke@435 | 78 | uintptr_t off = (uintptr_t)( _chunk + sizeof(VtableStub) ) % pd_code_alignment(); |
duke@435 | 79 | if (off != 0) _chunk += pd_code_alignment() - off; |
duke@435 | 80 | } |
duke@435 | 81 | |
duke@435 | 82 | public: |
duke@435 | 83 | // Query |
duke@435 | 84 | bool is_itable_stub() { return !_is_vtable_stub; } |
duke@435 | 85 | bool is_vtable_stub() { return _is_vtable_stub; } |
duke@435 | 86 | bool is_abstract_method_error(address epc) { return epc == code_begin()+_ame_offset; } |
duke@435 | 87 | bool is_null_pointer_exception(address epc) { return epc == code_begin()+_npe_offset; } |
duke@435 | 88 | |
duke@435 | 89 | void print(); |
duke@435 | 90 | }; |
duke@435 | 91 | |
duke@435 | 92 | |
duke@435 | 93 | // VtableStubs creates the code stubs for compiled calls through vtables. |
duke@435 | 94 | // There is one stub per (vtable index, args_size) pair, and the stubs are |
duke@435 | 95 | // never deallocated. They don't need to be GCed because they contain no oops. |
duke@435 | 96 | |
duke@435 | 97 | class VtableStubs : AllStatic { |
duke@435 | 98 | public: // N must be public (some compilers need this for _table) |
duke@435 | 99 | enum { |
duke@435 | 100 | N = 256, // size of stub table; must be power of two |
duke@435 | 101 | mask = N - 1 |
duke@435 | 102 | }; |
duke@435 | 103 | |
duke@435 | 104 | private: |
duke@435 | 105 | static VtableStub* _table[N]; // table of existing stubs |
duke@435 | 106 | static int _number_of_vtable_stubs; // number of stubs created so far (for statistics) |
duke@435 | 107 | |
duke@435 | 108 | static VtableStub* create_vtable_stub(int vtable_index); |
duke@435 | 109 | static VtableStub* create_itable_stub(int vtable_index); |
duke@435 | 110 | static VtableStub* lookup (bool is_vtable_stub, int vtable_index); |
duke@435 | 111 | static void enter (bool is_vtable_stub, int vtable_index, VtableStub* s); |
duke@435 | 112 | static inline uint hash (bool is_vtable_stub, int vtable_index); |
duke@435 | 113 | |
duke@435 | 114 | public: |
duke@435 | 115 | static address create_stub(bool is_vtable_stub, int vtable_index, methodOop method); // return the entry point of a stub for this call |
duke@435 | 116 | static bool is_entry_point(address pc); // is pc a vtable stub entry point? |
duke@435 | 117 | static bool contains(address pc); // is pc within any stub? |
duke@435 | 118 | static VtableStub* stub_containing(address pc); // stub containing pc or NULL |
duke@435 | 119 | static int number_of_vtable_stubs() { return _number_of_vtable_stubs; } |
duke@435 | 120 | static void initialize(); |
duke@435 | 121 | }; |