Mercurial > hg > truffle
annotate src/share/vm/interpreter/oopMapCache.hpp @ 12356:359f7e70ae7f
Reduce HotSpot diff and fix previous merge
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Fri, 11 Oct 2013 15:41:33 +0200 |
| parents | da91efe96a93 |
| children | c204e2044c29 |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 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_INTERPRETER_OOPMAPCACHE_HPP |
| 26 #define SHARE_VM_INTERPRETER_OOPMAPCACHE_HPP | |
| 27 | |
| 28 #include "oops/generateOopMap.hpp" | |
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29 #include "runtime/mutex.hpp" |
| 1972 | 30 |
| 0 | 31 // A Cache for storing (method, bci) -> oopMap. |
| 32 // The memory management system uses the cache when locating object | |
| 33 // references in an interpreted frame. | |
| 34 // | |
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35 // OopMapCache's are allocated lazily per InstanceKlass. |
| 0 | 36 |
| 37 // The oopMap (InterpreterOopMap) is stored as a bit mask. If the | |
| 38 // bit_mask can fit into two words it is stored in | |
| 39 // the _bit_mask array, otherwise it is allocated on the heap. | |
| 40 // For OopMapCacheEntry the bit_mask is allocated in the C heap | |
| 41 // because these entries persist between garbage collections. | |
| 42 // For InterpreterOopMap the bit_mask is allocated in | |
| 43 // a resource area for better performance. InterpreterOopMap | |
| 44 // should only be created and deleted during same garbage collection. | |
| 45 // | |
| 46 // If ENABBLE_ZAP_DEAD_LOCALS is defined, two bits are used | |
| 47 // per entry instead of one. In all cases, | |
| 48 // the first bit is set to indicate oops as opposed to other | |
| 49 // values. If the second bit is available, | |
| 50 // it is set for dead values. We get the following encoding: | |
| 51 // | |
| 52 // 00 live value | |
| 53 // 01 live oop | |
| 54 // 10 dead value | |
| 55 // 11 <unused> (we cannot distinguish between dead oops or values with the current oop map generator) | |
| 56 | |
| 57 | |
| 58 class OffsetClosure { | |
| 59 public: | |
| 60 virtual void offset_do(int offset) = 0; | |
| 61 }; | |
| 62 | |
| 63 | |
| 64 class InterpreterOopMap: ResourceObj { | |
| 65 friend class OopMapCache; | |
| 66 | |
| 67 public: | |
| 68 enum { | |
| 69 N = 2, // the number of words reserved | |
| 70 // for inlined mask storage | |
| 71 small_mask_limit = N * BitsPerWord, // the maximum number of bits | |
| 72 // available for small masks, | |
| 73 // small_mask_limit can be set to 0 | |
| 74 // for testing bit_mask allocation | |
| 75 | |
| 76 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 77 bits_per_entry = 2, | |
| 78 dead_bit_number = 1, | |
| 79 #else | |
| 80 bits_per_entry = 1, | |
| 81 #endif | |
| 82 oop_bit_number = 0 | |
| 83 }; | |
| 84 | |
| 85 private: | |
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86 Method* _method; // the method for which the mask is valid |
| 0 | 87 unsigned short _bci; // the bci for which the mask is valid |
| 88 int _mask_size; // the mask size in bits | |
| 89 int _expression_stack_size; // the size of the expression stack in slots | |
| 90 | |
| 91 protected: | |
| 92 intptr_t _bit_mask[N]; // the bit mask if | |
| 93 // mask_size <= small_mask_limit, | |
| 94 // ptr to bit mask otherwise | |
| 95 // "protected" so that sub classes can | |
| 96 // access it without using trickery in | |
| 97 // methd bit_mask(). | |
| 98 #ifdef ASSERT | |
| 99 bool _resource_allocate_bit_mask; | |
| 100 #endif | |
| 101 | |
| 102 // access methods | |
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103 Method* method() const { return _method; } |
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104 void set_method(Method* v) { _method = v; } |
| 0 | 105 int bci() const { return _bci; } |
| 106 void set_bci(int v) { _bci = v; } | |
| 107 int mask_size() const { return _mask_size; } | |
| 108 void set_mask_size(int v) { _mask_size = v; } | |
| 109 int number_of_entries() const { return mask_size() / bits_per_entry; } | |
| 110 // Test bit mask size and return either the in-line bit mask or allocated | |
| 111 // bit mask. | |
| 112 uintptr_t* bit_mask() { return (uintptr_t*)(mask_size() <= small_mask_limit ? (intptr_t)_bit_mask : _bit_mask[0]); } | |
| 113 | |
| 114 // return the word size of_bit_mask. mask_size() <= 4 * MAX_USHORT | |
| 115 size_t mask_word_size() { | |
| 116 return (mask_size() + BitsPerWord - 1) / BitsPerWord; | |
| 117 } | |
| 118 | |
| 119 uintptr_t entry_at(int offset) { int i = offset * bits_per_entry; return bit_mask()[i / BitsPerWord] >> (i % BitsPerWord); } | |
| 120 | |
| 121 void set_expression_stack_size(int sz) { _expression_stack_size = sz; } | |
| 122 | |
| 123 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 124 bool is_dead(int offset) { return (entry_at(offset) & (1 << dead_bit_number)) != 0; } | |
| 125 #endif | |
| 126 | |
| 127 // Lookup | |
| 128 bool match(methodHandle method, int bci) { return _method == method() && _bci == bci; } | |
| 129 bool is_empty(); | |
| 130 | |
| 131 // Initialization | |
| 132 void initialize(); | |
| 133 | |
| 134 public: | |
| 135 InterpreterOopMap(); | |
| 136 ~InterpreterOopMap(); | |
| 137 | |
| 138 // Copy the OopMapCacheEntry in parameter "from" into this | |
| 139 // InterpreterOopMap. If the _bit_mask[0] in "from" points to | |
| 140 // allocated space (i.e., the bit mask was to large to hold | |
| 141 // in-line), allocate the space from a Resource area. | |
| 142 void resource_copy(OopMapCacheEntry* from); | |
| 143 | |
| 144 void iterate_oop(OffsetClosure* oop_closure); | |
| 145 void print(); | |
| 146 | |
| 147 bool is_oop (int offset) { return (entry_at(offset) & (1 << oop_bit_number )) != 0; } | |
| 148 | |
| 149 int expression_stack_size() { return _expression_stack_size; } | |
| 150 | |
| 151 #ifdef ENABLE_ZAP_DEAD_LOCALS | |
| 152 void iterate_all(OffsetClosure* oop_closure, OffsetClosure* value_closure, OffsetClosure* dead_closure); | |
| 153 #endif | |
| 154 }; | |
| 155 | |
| 6197 | 156 class OopMapCache : public CHeapObj<mtClass> { |
| 0 | 157 private: |
| 158 enum { _size = 32, // Use fixed size for now | |
| 159 _probe_depth = 3 // probe depth in case of collisions | |
| 160 }; | |
| 161 | |
| 162 OopMapCacheEntry* _array; | |
| 163 | |
| 164 unsigned int hash_value_for(methodHandle method, int bci); | |
| 165 OopMapCacheEntry* entry_at(int i) const; | |
| 166 | |
| 167 Mutex _mut; | |
| 168 | |
| 169 void flush(); | |
| 170 | |
| 171 public: | |
| 172 OopMapCache(); | |
| 173 ~OopMapCache(); // free up memory | |
| 174 | |
| 175 // flush cache entry is occupied by an obsolete method | |
| 176 void flush_obsolete_entries(); | |
| 177 | |
| 178 // Returns the oopMap for (method, bci) in parameter "entry". | |
| 179 // Returns false if an oop map was not found. | |
| 180 void lookup(methodHandle method, int bci, InterpreterOopMap* entry); | |
| 181 | |
| 182 // Compute an oop map without updating the cache or grabbing any locks (for debugging) | |
| 183 static void compute_one_oop_map(methodHandle method, int bci, InterpreterOopMap* entry); | |
| 184 | |
| 185 // Returns total no. of bytes allocated as part of OopMapCache's | |
| 186 static long memory_usage() PRODUCT_RETURN0; | |
| 187 }; | |
| 1972 | 188 |
| 189 #endif // SHARE_VM_INTERPRETER_OOPMAPCACHE_HPP |