Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.hpp @ 1293:51db1e4b379d
6932536: JSR 292 modified JDK MethodHandlesTest fails on x86_64
Summary: A modified MethodHandlesTest revealed two bugs on x86_64.
Reviewed-by: never, jrose
author | twisti |
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date | Mon, 08 Mar 2010 04:46:30 -0800 |
parents | 167c2986d91b |
children | c18cbe5936b8 |
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; | |
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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 | |
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64 public: |
0 | 65 class ArgumentMap; |
66 class StateInfo; | |
67 | |
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68 private: |
0 | 69 // helper functions |
70 bool is_argument(int i) { return i >= 0 && i < _arg_size; } | |
71 | |
72 void raw_push(int i) { _stack.push(i); } | |
73 int raw_pop() { return _stack.is_empty() ? -1 : _stack.pop(); } | |
74 void apush(int i) { raw_push(i); } | |
75 void spush() { raw_push(-1); } | |
76 void lpush() { spush(); spush(); } | |
77 int apop() { return raw_pop(); } | |
78 void spop() { assert(_stack.is_empty() || _stack.top() == -1, ""); raw_pop(); } | |
79 void lpop() { spop(); spop(); } | |
80 | |
81 void set_returned(ArgumentMap vars); | |
82 bool is_argument(ArgumentMap vars); | |
83 bool is_arg_stack(ArgumentMap vars); | |
84 void clear_bits(ArgumentMap vars, BitMap &bs); | |
85 void set_method_escape(ArgumentMap vars); | |
86 void set_global_escape(ArgumentMap vars); | |
87 void set_dirty(ArgumentMap vars); | |
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88 void set_modified(ArgumentMap vars, int offs, int size); |
0 | 89 |
90 bool is_recursive_call(ciMethod* callee); | |
91 void add_dependence(ciKlass *klass, ciMethod *meth); | |
92 void propagate_dependencies(ciMethod *meth); | |
93 void invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder); | |
94 | |
95 void iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors); | |
96 void iterate_blocks(Arena *); | |
97 void merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state); | |
98 | |
99 // analysis | |
100 void initialize(); | |
101 void clear_escape_info(); | |
102 void compute_escape_info(); | |
103 vmIntrinsics::ID known_intrinsic(); | |
104 bool compute_escape_for_intrinsic(vmIntrinsics::ID iid); | |
105 bool do_analysis(); | |
106 | |
107 void read_escape_info(); | |
108 | |
109 bool contains(uint arg_set1, uint arg_set2); | |
110 | |
111 public: | |
112 BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL); | |
113 | |
114 // accessors | |
115 ciMethod* method() const { return _method; } | |
116 ciMethodData* methodData() const { return _methodData; } | |
117 BCEscapeAnalyzer* parent() const { return _parent; } | |
118 int level() const { return _level; } | |
119 ciObjectList* dependencies() { return &_dependencies; } | |
120 bool has_dependencies() const { return !_dependencies.is_empty(); } | |
121 | |
122 // retrieval of interprocedural escape information | |
123 | |
124 // The given argument does not escape the callee. | |
125 bool is_arg_local(int i) const { | |
126 return !_conservative && _arg_local.at(i); | |
127 } | |
128 | |
129 // The given argument escapes the callee, but does not become globally | |
130 // reachable. | |
131 bool is_arg_stack(int i) const { | |
132 return !_conservative && _arg_stack.at(i); | |
133 } | |
134 | |
135 // The given argument does not escape globally, and may be returned. | |
136 bool is_arg_returned(int i) const { | |
137 return !_conservative && _arg_returned.at(i); } | |
138 | |
139 // True iff only input arguments are returned. | |
140 bool is_return_local() const { | |
141 return !_conservative && _return_local; | |
142 } | |
143 | |
144 // True iff only newly allocated unescaped objects are returned. | |
145 bool is_return_allocated() const { | |
146 return !_conservative && _return_allocated && !_allocated_escapes; | |
147 } | |
148 | |
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149 // Tracking of argument modification |
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150 |
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151 enum {OFFSET_ANY = -1}; |
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152 bool is_arg_modified(int arg, int offset, int size_in_bytes); |
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153 void set_arg_modified(int arg, int offset, int size_in_bytes); |
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154 bool has_non_arg_side_affects() { return _unknown_modified; } |
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155 |
0 | 156 // Copy dependencies from this analysis into "deps" |
157 void copy_dependencies(Dependencies *deps); | |
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158 |
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159 #ifndef PRODUCT |
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160 // dump escape information |
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161 void dump(); |
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162 #endif |
0 | 163 }; |