Mercurial > hg > truffle
annotate src/share/vm/prims/methodComparator.hpp @ 13415:c8c2d6b82499
8028126: nsk/jvmti/scenarios/hotswap/HS101/hs101t006 Crashed the vm on Solaris-sparc64 fastdebug builds: only current thread can flush its registers
Summary: Fix a race between VMOp_GetCurrentLocation reaching a safepoint and arget thread exiting from Java execution
Reviewed-by: sla, dholmes, dsamersoff
Contributed-by: serguei.spitsyn@oracle.com
| author | sspitsyn |
|---|---|
| date | Tue, 03 Dec 2013 15:41:35 -0800 |
| parents | da91efe96a93 |
| children |
| rev | line source |
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| 0 | 1 /* |
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coleenp
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2 * Copyright (c) 2000, 2012, 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" | |
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29 #include "oops/constantPool.hpp" |
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30 #include "oops/method.hpp" |
| 1972 | 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; | |
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40 static ConstantPool* _old_cp; |
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da91efe96a93
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parents:
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41 static ConstantPool* _new_cp; |
| 0 | 42 static BciMap *_bci_map; |
| 43 static bool _switchable_test; | |
| 44 static GrowableArray<int> *_fwd_jmps; | |
| 45 | |
| 46 static bool args_same(Bytecodes::Code c_old, Bytecodes::Code c_new); | |
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47 static bool pool_constants_same(int cpi_old, int cpi_new); |
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48 static int check_stack_and_locals_size(Method* old_method, Method* new_method); |
| 0 | 49 |
| 50 public: | |
| 51 // Check if the new method is equivalent to the old one modulo constant pool (EMCP). | |
| 52 // Intuitive definition: two versions of the same method are EMCP, if they don't differ | |
| 53 // on the source code level. Practically, we check whether the only difference between | |
| 54 // method versions is some constantpool indices embedded into the bytecodes, and whether | |
| 55 // these indices eventually point to the same constants for both method versions. | |
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56 static bool methods_EMCP(Method* old_method, Method* new_method); |
| 0 | 57 |
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58 static bool methods_switchable(Method* old_method, Method* new_method, BciMap &bci_map); |
| 0 | 59 }; |
| 60 | |
| 61 | |
| 62 // ByteCode Index Map. For two versions of the same method, where the new version may contain | |
| 63 // fragments not found in the old version, provides a mapping from an index of a bytecode in | |
| 64 // the old method to the index of the same bytecode in the new method. | |
| 65 | |
| 66 class BciMap { | |
| 67 private: | |
| 68 int *_old_bci, *_new_st_bci, *_new_end_bci; | |
| 69 int _cur_size, _cur_pos; | |
| 70 int _pos; | |
| 71 | |
| 72 public: | |
| 73 BciMap() { | |
| 74 _cur_size = 50; | |
| 75 _old_bci = (int*) malloc(sizeof(int) * _cur_size); | |
| 76 _new_st_bci = (int*) malloc(sizeof(int) * _cur_size); | |
| 77 _new_end_bci = (int*) malloc(sizeof(int) * _cur_size); | |
| 78 _cur_pos = 0; | |
| 79 } | |
| 80 | |
| 81 ~BciMap() { | |
| 82 free(_old_bci); | |
| 83 free(_new_st_bci); | |
| 84 free(_new_end_bci); | |
| 85 } | |
| 86 | |
| 87 // Store the position of an added fragment, e.g. | |
| 88 // | |
| 89 // |<- old_bci | |
| 90 // ----------------------------------------- | |
| 91 // Old method |invokevirtual 5|aload 1|... | |
| 92 // ----------------------------------------- | |
| 93 // | |
| 94 // |<- new_st_bci |<- new_end_bci | |
| 95 // -------------------------------------------------------------------- | |
| 96 // New method |invokevirual 5|aload 2|invokevirtual 6|aload 1|... | |
| 97 // -------------------------------------------------------------------- | |
| 98 // ^^^^^^^^^^^^^^^^^^^^^^^^ | |
| 99 // Added fragment | |
| 100 | |
| 101 void store_fragment_location(int old_bci, int new_st_bci, int new_end_bci) { | |
| 102 if (_cur_pos == _cur_size) { | |
| 103 _cur_size += 10; | |
| 104 _old_bci = (int*) realloc(_old_bci, sizeof(int) * _cur_size); | |
| 105 _new_st_bci = (int*) realloc(_new_st_bci, sizeof(int) * _cur_size); | |
| 106 _new_end_bci = (int*) realloc(_new_end_bci, sizeof(int) * _cur_size); | |
| 107 } | |
| 108 _old_bci[_cur_pos] = old_bci; | |
| 109 _new_st_bci[_cur_pos] = new_st_bci; | |
| 110 _new_end_bci[_cur_pos] = new_end_bci; | |
| 111 _cur_pos++; | |
| 112 } | |
| 113 | |
| 114 int new_bci_for_old(int old_bci) { | |
| 115 if (_cur_pos == 0 || old_bci < _old_bci[0]) return old_bci; | |
| 116 _pos = 1; | |
| 117 while (_pos < _cur_pos && old_bci >= _old_bci[_pos]) | |
| 118 _pos++; | |
| 119 return _new_end_bci[_pos-1] + (old_bci - _old_bci[_pos-1]); | |
| 120 } | |
| 121 | |
| 122 // Test if two indexes - one in the old method and another in the new one - correspond | |
| 123 // to the same bytecode | |
| 124 bool old_and_new_locations_same(int old_dest_bci, int new_dest_bci) { | |
| 125 if (new_bci_for_old(old_dest_bci) == new_dest_bci) | |
| 126 return true; | |
| 127 else if (_old_bci[_pos-1] == old_dest_bci) | |
| 128 return (new_dest_bci == _new_st_bci[_pos-1]); | |
| 129 else return false; | |
| 130 } | |
| 131 }; | |
| 1972 | 132 |
| 133 #endif // SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |