Mercurial > hg > truffle
annotate src/share/vm/code/vtableStubs.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | 126ea7725993 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 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 | |
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89 void print_on(outputStream* st) const; |
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90 void print() const { print_on(tty); } |
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91 |
| 0 | 92 }; |
| 93 | |
| 94 | |
| 95 // VtableStubs creates the code stubs for compiled calls through vtables. | |
| 96 // There is one stub per (vtable index, args_size) pair, and the stubs are | |
| 97 // never deallocated. They don't need to be GCed because they contain no oops. | |
| 98 | |
| 99 class VtableStubs : AllStatic { | |
| 100 public: // N must be public (some compilers need this for _table) | |
| 101 enum { | |
| 102 N = 256, // size of stub table; must be power of two | |
| 103 mask = N - 1 | |
| 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 }; |