Mercurial > hg > truffle
annotate src/share/vm/code/oopRecorder.hpp @ 3229:4a6bda6cfe28
Fix for usages that are phi in rematerialization
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Thu, 21 Jul 2011 11:32:22 +0200 |
parents | f95d63e2154a |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
1579 | 2 * Copyright (c) 1998, 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. | |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
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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). | |
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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_CODE_OOPRECORDER_HPP |
26 #define SHARE_VM_CODE_OOPRECORDER_HPP | |
27 | |
28 #include "runtime/handles.hpp" | |
29 #include "utilities/growableArray.hpp" | |
30 | |
0 | 31 // Recording and retrieval of oop relocations in compiled code. |
32 | |
33 class CodeBlob; | |
34 | |
35 class OopRecorder : public ResourceObj { | |
36 public: | |
37 // A two-way mapping from positive indexes to oop handles. | |
38 // The zero index is reserved for a constant (sharable) null. | |
39 // Indexes may not be negative. | |
40 | |
41 // Use the given arena to manage storage, if not NULL. | |
42 // By default, uses the current ResourceArea. | |
43 OopRecorder(Arena* arena = NULL); | |
44 | |
45 // Generate a new index on which CodeBlob::oop_addr_at will work. | |
46 // allocate_index and find_index never return the same index, | |
47 // and allocate_index never returns the same index twice. | |
48 // In fact, two successive calls to allocate_index return successive ints. | |
49 int allocate_index(jobject h) { | |
50 return add_handle(h, false); | |
51 } | |
52 | |
53 // For a given jobject, this will return the same index repeatedly. | |
54 // The index can later be given to oop_at to retrieve the oop. | |
55 // However, the oop must not be changed via CodeBlob::oop_addr_at. | |
56 int find_index(jobject h) { | |
57 int index = maybe_find_index(h); | |
58 if (index < 0) { // previously unallocated | |
59 index = add_handle(h, true); | |
60 } | |
61 return index; | |
62 } | |
63 | |
64 // variant of find_index which does not allocate if not found (yields -1) | |
65 int maybe_find_index(jobject h); | |
66 | |
67 // returns the size of the generated oop table, for sizing the CodeBlob. | |
68 // must be called after all oops are allocated! | |
69 int oop_size(); | |
70 | |
71 // Retrieve the oop handle at a given index. | |
72 jobject handle_at(int index); | |
73 | |
74 int element_count() { | |
75 // there is always a NULL virtually present as first object | |
76 return _handles->length() + first_index; | |
77 } | |
78 | |
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79 // copy the generated oop table to nmethod |
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80 void copy_to(nmethod* nm); // => nm->copy_oops(_handles) |
0 | 81 |
82 bool is_unused() { return _handles == NULL && !_complete; } | |
83 #ifdef ASSERT | |
84 bool is_complete() { return _complete; } | |
85 #endif | |
86 | |
87 private: | |
88 // leaky hash table of handle => index, to help detect duplicate insertion | |
89 class IndexCache: public ResourceObj { | |
90 // This class is only used by the OopRecorder class. | |
91 friend class OopRecorder; | |
92 enum { | |
93 _log_cache_size = 9, | |
94 _cache_size = (1<<_log_cache_size), | |
95 // Index entries are ints. The LSBit is a collision indicator. | |
96 _collision_bit_shift = 0, | |
97 _collision_bit = 1, | |
98 _index_shift = _collision_bit_shift+1 | |
99 }; | |
100 int _cache[_cache_size]; | |
101 static juint cache_index(jobject handle) { | |
102 juint ci = (int) (intptr_t) handle; | |
103 ci ^= ci >> (BitsPerByte*2); | |
104 ci += ci >> (BitsPerByte*1); | |
105 return ci & (_cache_size-1); | |
106 } | |
107 int* cache_location(jobject handle) { | |
108 return &_cache[ cache_index(handle) ]; | |
109 } | |
110 static bool cache_location_collision(int* cloc) { | |
111 return ((*cloc) & _collision_bit) != 0; | |
112 } | |
113 static int cache_location_index(int* cloc) { | |
114 return (*cloc) >> _index_shift; | |
115 } | |
116 static void set_cache_location_index(int* cloc, int index) { | |
117 int cval0 = (*cloc); | |
118 int cval1 = (index << _index_shift); | |
119 if (cval0 != 0 && cval1 != cval0) cval1 += _collision_bit; | |
120 (*cloc) = cval1; | |
121 } | |
122 IndexCache(); | |
123 }; | |
124 | |
125 // Helper function; returns false for NULL or Universe::non_oop_word(). | |
126 inline bool is_real_jobject(jobject h); | |
127 | |
128 void maybe_initialize(); | |
129 int add_handle(jobject h, bool make_findable); | |
130 | |
131 enum { null_index = 0, first_index = 1, index_cache_threshold = 20 }; | |
132 | |
133 GrowableArray<jobject>* _handles; // ordered list (first is always NULL) | |
134 GrowableArray<int>* _no_finds; // all unfindable indexes; usually empty | |
135 IndexCache* _indexes; // map: jobject -> its probable index | |
136 Arena* _arena; | |
137 bool _complete; | |
138 | |
139 #ifdef ASSERT | |
140 static int _find_index_calls, _hit_indexes, _missed_indexes; | |
141 #endif | |
142 }; | |
1972 | 143 |
144 #endif // SHARE_VM_CODE_OOPRECORDER_HPP |