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annotate src/share/vm/c1/c1_RangeCheckElimination.hpp @ 12421:dc4b09c9d68e
When FixedGuardNode is canonicalized away, it should not be replaced with the previous begin
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Mon, 14 Oct 2013 17:49:25 +0200 |
parents | acadb114c818 |
children | d13d7aba8c12 |
rev | line source |
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8860 | 1 /* |
2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. | |
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 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SHARE_VM_C1_C1_RANGECHECKELIMINATION_HPP | |
26 #define SHARE_VM_C1_C1_RANGECHECKELIMINATION_HPP | |
27 | |
28 #include "c1/c1_Instruction.hpp" | |
29 | |
30 // Base class for range check elimination | |
31 class RangeCheckElimination : AllStatic { | |
32 public: | |
33 static void eliminate(IR *ir); | |
34 }; | |
35 | |
36 // Implementation | |
37 class RangeCheckEliminator VALUE_OBJ_CLASS_SPEC { | |
38 private: | |
39 int _number_of_instructions; | |
40 bool _optimistic; // Insert predicates and deoptimize when they fail | |
41 IR *_ir; | |
42 | |
43 define_array(BlockBeginArray, BlockBegin*) | |
44 define_stack(BlockBeginList, BlockBeginArray) | |
45 define_stack(IntegerStack, intArray) | |
46 define_array(IntegerMap, IntegerStack*) | |
47 | |
48 class Verification : public _ValueObj /*VALUE_OBJ_CLASS_SPEC*/, public BlockClosure { | |
49 private: | |
50 IR *_ir; | |
51 boolArray _used; | |
52 BlockBeginList _current; | |
53 BlockBeginList _successors; | |
54 | |
55 public: | |
56 Verification(IR *ir); | |
57 virtual void block_do(BlockBegin *block); | |
58 bool can_reach(BlockBegin *start, BlockBegin *end, BlockBegin *dont_use = NULL); | |
59 bool dominates(BlockBegin *dominator, BlockBegin *block); | |
60 }; | |
61 | |
62 public: | |
63 // Bounds for an instruction in the form x + c which c integer | |
64 // constant and x another instruction | |
65 class Bound : public CompilationResourceObj { | |
66 private: | |
67 int _upper; | |
68 Value _upper_instr; | |
69 int _lower; | |
70 Value _lower_instr; | |
71 | |
72 public: | |
73 Bound(); | |
74 Bound(Value v); | |
75 Bound(Instruction::Condition cond, Value v, int constant = 0); | |
76 Bound(int lower, Value lower_instr, int upper, Value upper_instr); | |
77 ~Bound(); | |
78 | |
79 #ifdef ASSERT | |
80 void add_assertion(Instruction *instruction, Instruction *position, int i, Value instr, Instruction::Condition cond); | |
81 #endif | |
82 int upper(); | |
83 Value upper_instr(); | |
84 int lower(); | |
85 Value lower_instr(); | |
86 void print(); | |
87 bool check_no_overflow(int const_value); | |
88 void or_op(Bound *b); | |
89 void and_op(Bound *b); | |
90 bool has_upper(); | |
91 bool has_lower(); | |
92 void set_upper(int upper, Value upper_instr); | |
93 void set_lower(int lower, Value lower_instr); | |
94 bool is_smaller(Bound *b); | |
95 void remove_upper(); | |
96 void remove_lower(); | |
97 void add_constant(int value); | |
98 Bound *copy(); | |
99 | |
100 private: | |
101 void init(); | |
102 }; | |
103 | |
104 | |
105 class Visitor : public InstructionVisitor { | |
106 private: | |
107 Bound *_bound; | |
108 RangeCheckEliminator *_rce; | |
109 | |
110 public: | |
111 void set_range_check_eliminator(RangeCheckEliminator *rce) { _rce = rce; } | |
112 Bound *bound() const { return _bound; } | |
113 void clear_bound() { _bound = NULL; } | |
114 | |
115 protected: | |
116 // visitor functions | |
117 void do_Constant (Constant* x); | |
118 void do_IfOp (IfOp* x); | |
119 void do_LogicOp (LogicOp* x); | |
120 void do_ArithmeticOp (ArithmeticOp* x); | |
121 void do_Phi (Phi* x); | |
122 | |
123 void do_StoreField (StoreField* x) { /* nothing to do */ }; | |
124 void do_StoreIndexed (StoreIndexed* x) { /* nothing to do */ }; | |
125 void do_MonitorEnter (MonitorEnter* x) { /* nothing to do */ }; | |
126 void do_MonitorExit (MonitorExit* x) { /* nothing to do */ }; | |
127 void do_Invoke (Invoke* x) { /* nothing to do */ }; | |
128 void do_UnsafePutRaw (UnsafePutRaw* x) { /* nothing to do */ }; | |
129 void do_UnsafePutObject(UnsafePutObject* x) { /* nothing to do */ }; | |
130 void do_Intrinsic (Intrinsic* x) { /* nothing to do */ }; | |
131 void do_Local (Local* x) { /* nothing to do */ }; | |
132 void do_LoadField (LoadField* x) { /* nothing to do */ }; | |
133 void do_ArrayLength (ArrayLength* x) { /* nothing to do */ }; | |
134 void do_LoadIndexed (LoadIndexed* x) { /* nothing to do */ }; | |
135 void do_NegateOp (NegateOp* x) { /* nothing to do */ }; | |
136 void do_ShiftOp (ShiftOp* x) { /* nothing to do */ }; | |
137 void do_CompareOp (CompareOp* x) { /* nothing to do */ }; | |
138 void do_Convert (Convert* x) { /* nothing to do */ }; | |
139 void do_NullCheck (NullCheck* x) { /* nothing to do */ }; | |
140 void do_TypeCast (TypeCast* x) { /* nothing to do */ }; | |
141 void do_NewInstance (NewInstance* x) { /* nothing to do */ }; | |
142 void do_NewTypeArray (NewTypeArray* x) { /* nothing to do */ }; | |
143 void do_NewObjectArray (NewObjectArray* x) { /* nothing to do */ }; | |
144 void do_NewMultiArray (NewMultiArray* x) { /* nothing to do */ }; | |
145 void do_CheckCast (CheckCast* x) { /* nothing to do */ }; | |
146 void do_InstanceOf (InstanceOf* x) { /* nothing to do */ }; | |
147 void do_BlockBegin (BlockBegin* x) { /* nothing to do */ }; | |
148 void do_Goto (Goto* x) { /* nothing to do */ }; | |
149 void do_If (If* x) { /* nothing to do */ }; | |
150 void do_IfInstanceOf (IfInstanceOf* x) { /* nothing to do */ }; | |
151 void do_TableSwitch (TableSwitch* x) { /* nothing to do */ }; | |
152 void do_LookupSwitch (LookupSwitch* x) { /* nothing to do */ }; | |
153 void do_Return (Return* x) { /* nothing to do */ }; | |
154 void do_Throw (Throw* x) { /* nothing to do */ }; | |
155 void do_Base (Base* x) { /* nothing to do */ }; | |
156 void do_OsrEntry (OsrEntry* x) { /* nothing to do */ }; | |
157 void do_ExceptionObject(ExceptionObject* x) { /* nothing to do */ }; | |
158 void do_RoundFP (RoundFP* x) { /* nothing to do */ }; | |
159 void do_UnsafeGetRaw (UnsafeGetRaw* x) { /* nothing to do */ }; | |
160 void do_UnsafeGetObject(UnsafeGetObject* x) { /* nothing to do */ }; | |
161 void do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) { /* nothing to do */ }; | |
162 void do_UnsafePrefetchRead (UnsafePrefetchRead* x) { /* nothing to do */ }; | |
163 void do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) { /* nothing to do */ }; | |
164 void do_ProfileCall (ProfileCall* x) { /* nothing to do */ }; | |
165 void do_ProfileInvoke (ProfileInvoke* x) { /* nothing to do */ }; | |
166 void do_RuntimeCall (RuntimeCall* x) { /* nothing to do */ }; | |
167 void do_MemBar (MemBar* x) { /* nothing to do */ }; | |
168 void do_RangeCheckPredicate(RangeCheckPredicate* x) { /* nothing to do */ }; | |
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169 #ifdef ASSERT |
8860 | 170 void do_Assert (Assert* x) { /* nothing to do */ }; |
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171 #endif |
8860 | 172 }; |
173 | |
174 #ifdef ASSERT | |
175 void add_assertions(Bound *bound, Instruction *instruction, Instruction *position); | |
176 #endif | |
177 | |
178 define_array(BoundArray, Bound *) | |
179 define_stack(BoundStack, BoundArray) | |
180 define_array(BoundMap, BoundStack *) | |
181 define_array(AccessIndexedArray, AccessIndexed *) | |
182 define_stack(AccessIndexedList, AccessIndexedArray) | |
183 define_array(InstructionArray, Instruction *) | |
184 define_stack(InstructionList, InstructionArray) | |
185 | |
186 class AccessIndexedInfo : public CompilationResourceObj { | |
187 public: | |
188 AccessIndexedList *_list; | |
189 int _min; | |
190 int _max; | |
191 }; | |
192 | |
193 define_array(AccessIndexedInfoArray, AccessIndexedInfo *) | |
194 BoundMap _bounds; // Mapping from Instruction's id to current bound | |
195 AccessIndexedInfoArray _access_indexed_info; // Mapping from Instruction's id to AccessIndexedInfo for in block motion | |
196 Visitor _visitor; | |
197 | |
198 public: | |
199 RangeCheckEliminator(IR *ir); | |
200 | |
201 IR *ir() const { return _ir; } | |
202 | |
203 // Pass over the dominator tree to identify blocks where there's an oppportunity for optimization | |
204 bool set_process_block_flags(BlockBegin *block); | |
205 // The core of the optimization work: pass over the dominator tree | |
206 // to propagate bound information, insert predicate out of loops, | |
207 // eliminate bound checks when possible and perform in block motion | |
208 void calc_bounds(BlockBegin *block, BlockBegin *loop_header); | |
209 // reorder bound checks within a block in order to eliminate some of them | |
210 void in_block_motion(BlockBegin *block, AccessIndexedList &accessIndexed, InstructionList &arrays); | |
211 | |
212 // update/access current bound | |
213 void update_bound(IntegerStack &pushed, Value v, Instruction::Condition cond, Value value, int constant); | |
214 void update_bound(IntegerStack &pushed, Value v, Bound *bound); | |
215 Bound *get_bound(Value v); | |
216 | |
217 bool loop_invariant(BlockBegin *loop_header, Instruction *instruction); // check for loop invariance | |
218 void add_access_indexed_info(InstructionList &indices, int i, Value instruction, AccessIndexed *ai); // record indexed access for in block motion | |
219 void remove_range_check(AccessIndexed *ai); // Mark this instructions as not needing a range check | |
220 void add_if_condition(IntegerStack &pushed, Value x, Value y, Instruction::Condition condition); // Update bound for an If | |
221 bool in_array_bound(Bound *bound, Value array); // Check whether bound is known to fall within array | |
222 | |
223 // helper functions to work with predicates | |
224 Instruction* insert_after(Instruction* insert_position, Instruction* instr, int bci); | |
225 Instruction* predicate(Instruction* left, Instruction::Condition cond, Instruction* right, ValueStack* state, Instruction *insert_position, int bci=-1); | |
226 Instruction* predicate_cmp_with_const(Instruction* instr, Instruction::Condition cond, int constant, ValueStack* state, Instruction *insert_position, int bci=1); | |
227 Instruction* predicate_add(Instruction* left, int left_const, Instruction::Condition cond, Instruction* right, ValueStack* state, Instruction *insert_position, int bci=-1); | |
228 Instruction* predicate_add_cmp_with_const(Instruction* left, int left_const, Instruction::Condition cond, int constant, ValueStack* state, Instruction *insert_position, int bci=-1); | |
229 | |
230 void insert_deoptimization(ValueStack *state, Instruction *insert_position, Instruction *array_instr, // Add predicate | |
231 Instruction *length_instruction, Instruction *lower_instr, int lower, | |
232 Instruction *upper_instr, int upper, AccessIndexed *ai); | |
233 bool is_ok_for_deoptimization(Instruction *insert_position, Instruction *array_instr, // Can we safely add a predicate? | |
234 Instruction *length_instr, Instruction *lower_instr, | |
235 int lower, Instruction *upper_instr, int upper); | |
236 void process_if(IntegerStack &pushed, BlockBegin *block, If *cond); // process If Instruction | |
237 void process_access_indexed(BlockBegin *loop_header, BlockBegin *block, AccessIndexed *ai); // process indexed access | |
238 | |
239 void dump_condition_stack(BlockBegin *cur_block); | |
240 static void print_statistics(); | |
241 }; | |
242 | |
243 #endif // SHARE_VM_C1_C1_RANGECHECKELIMINATION_HPP |