Mercurial > hg > graal-compiler
annotate src/share/vm/prims/methodComparator.hpp @ 3917:eca1193ca245
4965777: GC changes to support use of discovered field for pending references
Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose.
Reviewed-by: jcoomes, mchung, stefank
| author | ysr |
|---|---|
| date | Wed, 07 Sep 2011 13:55:42 -0700 |
| parents | f95d63e2154a |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2010, 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 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |
| 26 #define SHARE_VM_PRIMS_METHODCOMPARATOR_HPP | |
| 27 | |
| 28 #include "interpreter/bytecodeStream.hpp" | |
| 29 #include "oops/constantPoolOop.hpp" | |
| 30 #include "oops/methodOop.hpp" | |
| 31 | |
| 0 | 32 class BciMap; |
| 33 | |
| 34 // methodComparator provides an interface for determining if methods of | |
| 35 // different versions of classes are equivalent or switchable | |
| 36 | |
| 37 class MethodComparator { | |
| 38 private: | |
| 39 static BytecodeStream *_s_old, *_s_new; | |
| 40 static constantPoolOop _old_cp, _new_cp; | |
| 41 static BciMap *_bci_map; | |
| 42 static bool _switchable_test; | |
| 43 static GrowableArray<int> *_fwd_jmps; | |
| 44 | |
| 45 static bool args_same(Bytecodes::Code c_old, Bytecodes::Code c_new); | |
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46 static bool pool_constants_same(int cpi_old, int cpi_new); |
| 0 | 47 static int check_stack_and_locals_size(methodOop old_method, methodOop new_method); |
| 48 | |
| 49 public: | |
| 50 // Check if the new method is equivalent to the old one modulo constant pool (EMCP). | |
| 51 // Intuitive definition: two versions of the same method are EMCP, if they don't differ | |
| 52 // on the source code level. Practically, we check whether the only difference between | |
| 53 // method versions is some constantpool indices embedded into the bytecodes, and whether | |
| 54 // these indices eventually point to the same constants for both method versions. | |
| 55 static bool methods_EMCP(methodOop old_method, methodOop new_method); | |
| 56 | |
| 57 static bool methods_switchable(methodOop old_method, methodOop new_method, BciMap &bci_map); | |
| 58 }; | |
| 59 | |
| 60 | |
| 61 // ByteCode Index Map. For two versions of the same method, where the new version may contain | |
| 62 // fragments not found in the old version, provides a mapping from an index of a bytecode in | |
| 63 // the old method to the index of the same bytecode in the new method. | |
| 64 | |
| 65 class BciMap { | |
| 66 private: | |
| 67 int *_old_bci, *_new_st_bci, *_new_end_bci; | |
| 68 int _cur_size, _cur_pos; | |
| 69 int _pos; | |
| 70 | |
| 71 public: | |
| 72 BciMap() { | |
| 73 _cur_size = 50; | |
| 74 _old_bci = (int*) malloc(sizeof(int) * _cur_size); | |
| 75 _new_st_bci = (int*) malloc(sizeof(int) * _cur_size); | |
| 76 _new_end_bci = (int*) malloc(sizeof(int) * _cur_size); | |
| 77 _cur_pos = 0; | |
| 78 } | |
| 79 | |
| 80 ~BciMap() { | |
| 81 free(_old_bci); | |
| 82 free(_new_st_bci); | |
| 83 free(_new_end_bci); | |
| 84 } | |
| 85 | |
| 86 // Store the position of an added fragment, e.g. | |
| 87 // | |
| 88 // |<- old_bci | |
| 89 // ----------------------------------------- | |
| 90 // Old method |invokevirtual 5|aload 1|... | |
| 91 // ----------------------------------------- | |
| 92 // | |
| 93 // |<- new_st_bci |<- new_end_bci | |
| 94 // -------------------------------------------------------------------- | |
| 95 // New method |invokevirual 5|aload 2|invokevirtual 6|aload 1|... | |
| 96 // -------------------------------------------------------------------- | |
| 97 // ^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 98 // Added fragment | |
| 99 | |
| 100 void store_fragment_location(int old_bci, int new_st_bci, int new_end_bci) { | |
| 101 if (_cur_pos == _cur_size) { | |
| 102 _cur_size += 10; | |
| 103 _old_bci = (int*) realloc(_old_bci, sizeof(int) * _cur_size); | |
| 104 _new_st_bci = (int*) realloc(_new_st_bci, sizeof(int) * _cur_size); | |
| 105 _new_end_bci = (int*) realloc(_new_end_bci, sizeof(int) * _cur_size); | |
| 106 } | |
| 107 _old_bci[_cur_pos] = old_bci; | |
| 108 _new_st_bci[_cur_pos] = new_st_bci; | |
| 109 _new_end_bci[_cur_pos] = new_end_bci; | |
| 110 _cur_pos++; | |
| 111 } | |
| 112 | |
| 113 int new_bci_for_old(int old_bci) { | |
| 114 if (_cur_pos == 0 || old_bci < _old_bci[0]) return old_bci; | |
| 115 _pos = 1; | |
| 116 while (_pos < _cur_pos && old_bci >= _old_bci[_pos]) | |
| 117 _pos++; | |
| 118 return _new_end_bci[_pos-1] + (old_bci - _old_bci[_pos-1]); | |
| 119 } | |
| 120 | |
| 121 // Test if two indexes - one in the old method and another in the new one - correspond | |
| 122 // to the same bytecode | |
| 123 bool old_and_new_locations_same(int old_dest_bci, int new_dest_bci) { | |
| 124 if (new_bci_for_old(old_dest_bci) == new_dest_bci) | |
| 125 return true; | |
| 126 else if (_old_bci[_pos-1] == old_dest_bci) | |
| 127 return (new_dest_bci == _new_st_bci[_pos-1]); | |
| 128 else return false; | |
| 129 } | |
| 130 }; | |
| 1972 | 131 |
| 132 #endif // SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |