Mercurial > hg > truffle
annotate src/share/vm/c1/c1_ValueMap.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
author | tonyp |
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date | Mon, 28 Jun 2010 14:13:17 -0400 |
parents | c18cbe5936b8 |
children | d5d065957597 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2008, 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 |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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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 class ValueMapEntry: public CompilationResourceObj { | |
26 private: | |
27 intx _hash; | |
28 Value _value; | |
29 int _nesting; | |
30 ValueMapEntry* _next; | |
31 | |
32 public: | |
33 ValueMapEntry(intx hash, Value value, int nesting, ValueMapEntry* next) | |
34 : _hash(hash) | |
35 , _value(value) | |
36 , _nesting(nesting) | |
37 , _next(next) | |
38 { | |
39 } | |
40 | |
41 intx hash() { return _hash; } | |
42 Value value() { return _value; } | |
43 int nesting() { return _nesting; } | |
44 ValueMapEntry* next() { return _next; } | |
45 | |
46 void set_next(ValueMapEntry* next) { _next = next; } | |
47 }; | |
48 | |
49 define_array(ValueMapEntryArray, ValueMapEntry*) | |
50 define_stack(ValueMapEntryList, ValueMapEntryArray) | |
51 | |
52 // ValueMap implements nested hash tables for value numbering. It | |
53 // maintains a set _killed_values which represents the instructions | |
54 // which have been killed so far and an array of linked lists of | |
55 // ValueMapEntries names _entries. Each ValueMapEntry has a nesting | |
56 // which indicates what ValueMap nesting it belongs to. Higher | |
57 // nesting values are always before lower values in the linked list. | |
58 // This allows cloning of parent ValueMaps by simply copying the heads | |
59 // of the list. _entry_count represents the number of reachable | |
60 // entries in the ValueMap. A ValueMap is only allowed to mutate | |
61 // ValueMapEntries with the same nesting level. Adding or removing | |
62 // entries at the current nesting level requires updating | |
63 // _entry_count. Elements in the parent's list that get killed can be | |
64 // skipped if they are at the head of the list by simply moving to the | |
65 // next element in the list and decrementing _entry_count. | |
66 | |
67 class ValueMap: public CompilationResourceObj { | |
68 private: | |
69 int _nesting; | |
70 ValueMapEntryArray _entries; | |
71 ValueSet _killed_values; | |
72 int _entry_count; | |
73 | |
74 int nesting() { return _nesting; } | |
75 bool is_local_value_numbering() { return _nesting == 0; } | |
76 bool is_global_value_numbering() { return _nesting > 0; } | |
77 | |
78 int entry_count() { return _entry_count; } | |
79 int size() { return _entries.length(); } | |
80 ValueMapEntry* entry_at(int i) { return _entries.at(i); } | |
81 | |
82 // calculates the index of a hash value in a hash table of size n | |
83 int entry_index(intx hash, int n) { return (unsigned int)hash % n; } | |
84 | |
85 // if entry_count > size_threshold, the size of the hash table is increased | |
86 int size_threshold() { return size(); } | |
87 | |
88 // management of the killed-bitset for global value numbering | |
89 void kill_value(Value v) { if (is_global_value_numbering()) _killed_values.put(v); } | |
90 bool is_killed(Value v) { if (is_global_value_numbering()) return _killed_values.contains(v); else return false; } | |
91 | |
92 // helper functions | |
93 void increase_table_size(); | |
94 | |
95 #ifndef PRODUCT | |
96 static int _number_of_finds; | |
97 static int _number_of_hits; | |
98 static int _number_of_kills; | |
99 #endif // PRODUCT | |
100 | |
101 public: | |
102 // creation | |
103 ValueMap(); // empty value map | |
104 ValueMap(ValueMap* old); // value map with increased nesting | |
105 | |
106 // manipulation | |
107 Value find_insert(Value x); | |
108 | |
109 void kill_memory(); | |
110 void kill_field(ciField* field); | |
111 void kill_array(ValueType* type); | |
112 void kill_exception(); | |
113 void kill_map(ValueMap* map); | |
114 void kill_all(); | |
115 | |
116 #ifndef PRODUCT | |
117 // debugging/printing | |
118 void print(); | |
119 | |
120 static void reset_statistics(); | |
121 static void print_statistics(); | |
122 #endif | |
123 }; | |
124 | |
125 define_array(ValueMapArray, ValueMap*) | |
126 | |
127 | |
128 class ValueNumberingVisitor: public InstructionVisitor { | |
129 protected: | |
130 // called by visitor functions for instructions that kill values | |
131 virtual void kill_memory() = 0; | |
132 virtual void kill_field(ciField* field) = 0; | |
133 virtual void kill_array(ValueType* type) = 0; | |
134 | |
135 // visitor functions | |
459 | 136 void do_StoreField (StoreField* x) { |
137 if (!x->is_initialized()) { | |
138 kill_memory(); | |
139 } else { | |
140 kill_field(x->field()); | |
141 } | |
142 } | |
143 void do_StoreIndexed (StoreIndexed* x) { kill_array(x->type()); } | |
144 void do_MonitorEnter (MonitorEnter* x) { kill_memory(); } | |
145 void do_MonitorExit (MonitorExit* x) { kill_memory(); } | |
146 void do_Invoke (Invoke* x) { kill_memory(); } | |
147 void do_UnsafePutRaw (UnsafePutRaw* x) { kill_memory(); } | |
148 void do_UnsafePutObject(UnsafePutObject* x) { kill_memory(); } | |
149 void do_Intrinsic (Intrinsic* x) { if (!x->preserves_state()) kill_memory(); } | |
0 | 150 |
459 | 151 void do_Phi (Phi* x) { /* nothing to do */ } |
152 void do_Local (Local* x) { /* nothing to do */ } | |
153 void do_Constant (Constant* x) { /* nothing to do */ } | |
154 void do_LoadField (LoadField* x) { | |
155 if (!x->is_initialized()) { | |
156 kill_memory(); | |
157 } | |
158 } | |
159 void do_ArrayLength (ArrayLength* x) { /* nothing to do */ } | |
160 void do_LoadIndexed (LoadIndexed* x) { /* nothing to do */ } | |
161 void do_NegateOp (NegateOp* x) { /* nothing to do */ } | |
162 void do_ArithmeticOp (ArithmeticOp* x) { /* nothing to do */ } | |
163 void do_ShiftOp (ShiftOp* x) { /* nothing to do */ } | |
164 void do_LogicOp (LogicOp* x) { /* nothing to do */ } | |
165 void do_CompareOp (CompareOp* x) { /* nothing to do */ } | |
166 void do_IfOp (IfOp* x) { /* nothing to do */ } | |
167 void do_Convert (Convert* x) { /* nothing to do */ } | |
168 void do_NullCheck (NullCheck* x) { /* nothing to do */ } | |
169 void do_NewInstance (NewInstance* x) { /* nothing to do */ } | |
170 void do_NewTypeArray (NewTypeArray* x) { /* nothing to do */ } | |
171 void do_NewObjectArray (NewObjectArray* x) { /* nothing to do */ } | |
172 void do_NewMultiArray (NewMultiArray* x) { /* nothing to do */ } | |
173 void do_CheckCast (CheckCast* x) { /* nothing to do */ } | |
174 void do_InstanceOf (InstanceOf* x) { /* nothing to do */ } | |
175 void do_BlockBegin (BlockBegin* x) { /* nothing to do */ } | |
176 void do_Goto (Goto* x) { /* nothing to do */ } | |
177 void do_If (If* x) { /* nothing to do */ } | |
178 void do_IfInstanceOf (IfInstanceOf* x) { /* nothing to do */ } | |
179 void do_TableSwitch (TableSwitch* x) { /* nothing to do */ } | |
180 void do_LookupSwitch (LookupSwitch* x) { /* nothing to do */ } | |
181 void do_Return (Return* x) { /* nothing to do */ } | |
182 void do_Throw (Throw* x) { /* nothing to do */ } | |
183 void do_Base (Base* x) { /* nothing to do */ } | |
184 void do_OsrEntry (OsrEntry* x) { /* nothing to do */ } | |
185 void do_ExceptionObject(ExceptionObject* x) { /* nothing to do */ } | |
186 void do_RoundFP (RoundFP* x) { /* nothing to do */ } | |
187 void do_UnsafeGetRaw (UnsafeGetRaw* x) { /* nothing to do */ } | |
188 void do_UnsafeGetObject(UnsafeGetObject* x) { /* nothing to do */ } | |
189 void do_UnsafePrefetchRead (UnsafePrefetchRead* x) { /* nothing to do */ } | |
190 void do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) { /* nothing to do */ } | |
191 void do_ProfileCall (ProfileCall* x) { /* nothing to do */ } | |
192 void do_ProfileCounter (ProfileCounter* x) { /* nothing to do */ } | |
193 }; | |
194 | |
195 | |
196 class ValueNumberingEffects: public ValueNumberingVisitor { | |
197 private: | |
198 ValueMap* _map; | |
199 | |
200 public: | |
201 // implementation for abstract methods of ValueNumberingVisitor | |
202 void kill_memory() { _map->kill_memory(); } | |
203 void kill_field(ciField* field) { _map->kill_field(field); } | |
204 void kill_array(ValueType* type) { _map->kill_array(type); } | |
205 | |
206 ValueNumberingEffects(ValueMap* map): _map(map) {} | |
0 | 207 }; |
208 | |
209 | |
210 class GlobalValueNumbering: public ValueNumberingVisitor { | |
211 private: | |
212 ValueMap* _current_map; // value map of current block | |
213 ValueMapArray _value_maps; // list of value maps for all blocks | |
214 | |
215 public: | |
216 // accessors | |
217 ValueMap* current_map() { return _current_map; } | |
218 ValueMap* value_map_of(BlockBegin* block) { return _value_maps.at(block->linear_scan_number()); } | |
219 void set_value_map_of(BlockBegin* block, ValueMap* map) { assert(value_map_of(block) == NULL, ""); _value_maps.at_put(block->linear_scan_number(), map); } | |
220 | |
221 // implementation for abstract methods of ValueNumberingVisitor | |
222 void kill_memory() { current_map()->kill_memory(); } | |
223 void kill_field(ciField* field) { current_map()->kill_field(field); } | |
224 void kill_array(ValueType* type) { current_map()->kill_array(type); } | |
225 | |
226 // main entry point that performs global value numbering | |
227 GlobalValueNumbering(IR* ir); | |
228 }; |