Mercurial > hg > graal-compiler
annotate src/share/vm/ci/bcEscapeAnalyzer.hpp @ 250:6ca61c728c2d
6712835: Server compiler fails with assertion (loop_count < K,"infinite loop in PhaseIterGVN::transform")
Reviewed-by: kvn
author | never |
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date | Fri, 25 Jul 2008 11:32:56 -0700 |
parents | d1605aabd0a1 |
children | 167c2986d91b |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2005-2008 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 define_array(ciObjectArray, ciObject*); | |
26 define_stack(ciObjectList, ciObjectArray); | |
27 | |
28 // This class implements a fast, conservative analysis of effect of methods | |
29 // on the escape state of their arguments. The analysis is at the bytecode | |
30 // level. | |
31 | |
32 class ciMethodBlocks; | |
33 class ciBlock; | |
34 | |
35 class BCEscapeAnalyzer : public ResourceObj { | |
36 private: | |
37 bool _conservative; // If true, return maximally | |
38 // conservative results. | |
39 ciMethod* _method; | |
40 ciMethodData* _methodData; | |
41 int _arg_size; | |
42 | |
43 intStack _stack; | |
44 | |
45 BitMap _arg_local; | |
46 BitMap _arg_stack; | |
47 BitMap _arg_returned; | |
48 BitMap _dirty; | |
45
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49 enum{ ARG_OFFSET_MAX = 31}; |
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50 uint *_arg_modified; |
0 | 51 |
52 bool _return_local; | |
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53 bool _return_allocated; |
0 | 54 bool _allocated_escapes; |
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55 bool _unknown_modified; |
0 | 56 |
57 ciObjectList _dependencies; | |
58 | |
59 ciMethodBlocks *_methodBlocks; | |
60 | |
61 BCEscapeAnalyzer* _parent; | |
62 int _level; | |
63 | |
64 class ArgumentMap; | |
65 class StateInfo; | |
66 | |
67 // helper functions | |
68 bool is_argument(int i) { return i >= 0 && i < _arg_size; } | |
69 | |
70 void raw_push(int i) { _stack.push(i); } | |
71 int raw_pop() { return _stack.is_empty() ? -1 : _stack.pop(); } | |
72 void apush(int i) { raw_push(i); } | |
73 void spush() { raw_push(-1); } | |
74 void lpush() { spush(); spush(); } | |
75 int apop() { return raw_pop(); } | |
76 void spop() { assert(_stack.is_empty() || _stack.top() == -1, ""); raw_pop(); } | |
77 void lpop() { spop(); spop(); } | |
78 | |
79 void set_returned(ArgumentMap vars); | |
80 bool is_argument(ArgumentMap vars); | |
81 bool is_arg_stack(ArgumentMap vars); | |
82 void clear_bits(ArgumentMap vars, BitMap &bs); | |
83 void set_method_escape(ArgumentMap vars); | |
84 void set_global_escape(ArgumentMap vars); | |
85 void set_dirty(ArgumentMap vars); | |
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86 void set_modified(ArgumentMap vars, int offs, int size); |
0 | 87 |
88 bool is_recursive_call(ciMethod* callee); | |
89 void add_dependence(ciKlass *klass, ciMethod *meth); | |
90 void propagate_dependencies(ciMethod *meth); | |
91 void invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder); | |
92 | |
93 void iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors); | |
94 void iterate_blocks(Arena *); | |
95 void merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state); | |
96 | |
97 // analysis | |
98 void initialize(); | |
99 void clear_escape_info(); | |
100 void compute_escape_info(); | |
101 vmIntrinsics::ID known_intrinsic(); | |
102 bool compute_escape_for_intrinsic(vmIntrinsics::ID iid); | |
103 bool do_analysis(); | |
104 | |
105 void read_escape_info(); | |
106 | |
107 bool contains(uint arg_set1, uint arg_set2); | |
108 | |
109 public: | |
110 BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL); | |
111 | |
112 // accessors | |
113 ciMethod* method() const { return _method; } | |
114 ciMethodData* methodData() const { return _methodData; } | |
115 BCEscapeAnalyzer* parent() const { return _parent; } | |
116 int level() const { return _level; } | |
117 ciObjectList* dependencies() { return &_dependencies; } | |
118 bool has_dependencies() const { return !_dependencies.is_empty(); } | |
119 | |
120 // retrieval of interprocedural escape information | |
121 | |
122 // The given argument does not escape the callee. | |
123 bool is_arg_local(int i) const { | |
124 return !_conservative && _arg_local.at(i); | |
125 } | |
126 | |
127 // The given argument escapes the callee, but does not become globally | |
128 // reachable. | |
129 bool is_arg_stack(int i) const { | |
130 return !_conservative && _arg_stack.at(i); | |
131 } | |
132 | |
133 // The given argument does not escape globally, and may be returned. | |
134 bool is_arg_returned(int i) const { | |
135 return !_conservative && _arg_returned.at(i); } | |
136 | |
137 // True iff only input arguments are returned. | |
138 bool is_return_local() const { | |
139 return !_conservative && _return_local; | |
140 } | |
141 | |
142 // True iff only newly allocated unescaped objects are returned. | |
143 bool is_return_allocated() const { | |
144 return !_conservative && _return_allocated && !_allocated_escapes; | |
145 } | |
146 | |
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147 // Tracking of argument modification |
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148 |
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149 enum {OFFSET_ANY = -1}; |
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150 bool is_arg_modified(int arg, int offset, int size_in_bytes); |
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151 void set_arg_modified(int arg, int offset, int size_in_bytes); |
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152 bool has_non_arg_side_affects() { return _unknown_modified; } |
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153 |
0 | 154 // Copy dependencies from this analysis into "deps" |
155 void copy_dependencies(Dependencies *deps); | |
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156 |
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157 #ifndef PRODUCT |
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158 // dump escape information |
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159 void dump(); |
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160 #endif |
0 | 161 }; |