0
|
1 /*
|
|
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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 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;
|
|
49
|
|
50 bool _return_local;
|
|
51 bool _allocated_escapes;
|
|
52 bool _return_allocated;
|
|
53
|
|
54 ciObjectList _dependencies;
|
|
55
|
|
56 ciMethodBlocks *_methodBlocks;
|
|
57
|
|
58 BCEscapeAnalyzer* _parent;
|
|
59 int _level;
|
|
60
|
|
61 class ArgumentMap;
|
|
62 class StateInfo;
|
|
63
|
|
64 // helper functions
|
|
65 bool is_argument(int i) { return i >= 0 && i < _arg_size; }
|
|
66
|
|
67 void raw_push(int i) { _stack.push(i); }
|
|
68 int raw_pop() { return _stack.is_empty() ? -1 : _stack.pop(); }
|
|
69 void apush(int i) { raw_push(i); }
|
|
70 void spush() { raw_push(-1); }
|
|
71 void lpush() { spush(); spush(); }
|
|
72 int apop() { return raw_pop(); }
|
|
73 void spop() { assert(_stack.is_empty() || _stack.top() == -1, ""); raw_pop(); }
|
|
74 void lpop() { spop(); spop(); }
|
|
75
|
|
76 void set_returned(ArgumentMap vars);
|
|
77 bool is_argument(ArgumentMap vars);
|
|
78 bool is_arg_stack(ArgumentMap vars);
|
|
79 void clear_bits(ArgumentMap vars, BitMap &bs);
|
|
80 void set_method_escape(ArgumentMap vars);
|
|
81 void set_global_escape(ArgumentMap vars);
|
|
82 void set_dirty(ArgumentMap vars);
|
|
83
|
|
84 bool is_recursive_call(ciMethod* callee);
|
|
85 void add_dependence(ciKlass *klass, ciMethod *meth);
|
|
86 void propagate_dependencies(ciMethod *meth);
|
|
87 void invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder);
|
|
88
|
|
89 void iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors);
|
|
90 void iterate_blocks(Arena *);
|
|
91 void merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state);
|
|
92
|
|
93 // analysis
|
|
94 void initialize();
|
|
95 void clear_escape_info();
|
|
96 void compute_escape_info();
|
|
97 vmIntrinsics::ID known_intrinsic();
|
|
98 bool compute_escape_for_intrinsic(vmIntrinsics::ID iid);
|
|
99 bool do_analysis();
|
|
100
|
|
101 void read_escape_info();
|
|
102
|
|
103 bool contains(uint arg_set1, uint arg_set2);
|
|
104
|
|
105 public:
|
|
106 BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL);
|
|
107
|
|
108 // accessors
|
|
109 ciMethod* method() const { return _method; }
|
|
110 ciMethodData* methodData() const { return _methodData; }
|
|
111 BCEscapeAnalyzer* parent() const { return _parent; }
|
|
112 int level() const { return _level; }
|
|
113 ciObjectList* dependencies() { return &_dependencies; }
|
|
114 bool has_dependencies() const { return !_dependencies.is_empty(); }
|
|
115
|
|
116 // retrieval of interprocedural escape information
|
|
117
|
|
118 // The given argument does not escape the callee.
|
|
119 bool is_arg_local(int i) const {
|
|
120 return !_conservative && _arg_local.at(i);
|
|
121 }
|
|
122
|
|
123 // The given argument escapes the callee, but does not become globally
|
|
124 // reachable.
|
|
125 bool is_arg_stack(int i) const {
|
|
126 return !_conservative && _arg_stack.at(i);
|
|
127 }
|
|
128
|
|
129 // The given argument does not escape globally, and may be returned.
|
|
130 bool is_arg_returned(int i) const {
|
|
131 return !_conservative && _arg_returned.at(i); }
|
|
132
|
|
133 // True iff only input arguments are returned.
|
|
134 bool is_return_local() const {
|
|
135 return !_conservative && _return_local;
|
|
136 }
|
|
137
|
|
138 // True iff only newly allocated unescaped objects are returned.
|
|
139 bool is_return_allocated() const {
|
|
140 return !_conservative && _return_allocated && !_allocated_escapes;
|
|
141 }
|
|
142
|
|
143 // Copy dependencies from this analysis into "deps"
|
|
144 void copy_dependencies(Dependencies *deps);
|
|
145 };
|