Wed, 12 Oct 2011 21:00:13 -0700
7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, never
1 /*
2 * Copyright (c) 2005, 2010, 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.
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23 */
25 #ifndef SHARE_VM_CI_BCESCAPEANALYZER_HPP
26 #define SHARE_VM_CI_BCESCAPEANALYZER_HPP
28 #ifdef COMPILER2
29 #include "ci/ciMethod.hpp"
30 #include "ci/ciMethodData.hpp"
31 #include "code/dependencies.hpp"
32 #include "libadt/vectset.hpp"
33 #include "memory/allocation.hpp"
34 #include "utilities/growableArray.hpp"
35 #endif
37 // This class implements a fast, conservative analysis of effect of methods
38 // on the escape state of their arguments. The analysis is at the bytecode
39 // level.
41 class ciMethodBlocks;
42 class ciBlock;
44 class BCEscapeAnalyzer : public ResourceObj {
45 private:
46 Arena* _arena; // ciEnv arena
48 bool _conservative; // If true, return maximally
49 // conservative results.
50 ciMethod* _method;
51 ciMethodData* _methodData;
52 int _arg_size;
53 VectorSet _arg_local;
54 VectorSet _arg_stack;
55 VectorSet _arg_returned;
56 VectorSet _dirty;
57 enum{ ARG_OFFSET_MAX = 31};
58 uint *_arg_modified;
60 bool _return_local;
61 bool _return_allocated;
62 bool _allocated_escapes;
63 bool _unknown_modified;
65 GrowableArray<ciObject *> _dependencies;
67 ciMethodBlocks *_methodBlocks;
69 BCEscapeAnalyzer* _parent;
70 int _level;
72 public:
73 class ArgumentMap;
74 class StateInfo;
76 private:
77 // helper functions
78 bool is_argument(int i) { return i >= 0 && i < _arg_size; }
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, VectorSet &bs);
83 void set_method_escape(ArgumentMap vars);
84 void set_global_escape(ArgumentMap vars);
85 void set_dirty(ArgumentMap vars);
86 void set_modified(ArgumentMap vars, int offs, int size);
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);
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);
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();
105 void read_escape_info();
107 bool contains(uint arg_set1, uint arg_set2);
109 public:
110 BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL);
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 GrowableArray<ciObject *>* dependencies() { return &_dependencies; }
118 bool has_dependencies() const { return !_dependencies.is_empty(); }
120 // retrieval of interprocedural escape information
122 // The given argument does not escape the callee.
123 bool is_arg_local(int i) const {
124 return !_conservative && _arg_local.test(i);
125 }
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.test(i);
131 }
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.test(i); }
137 // True iff only input arguments are returned.
138 bool is_return_local() const {
139 return !_conservative && _return_local;
140 }
142 // True iff only newly allocated unescaped objects are returned.
143 bool is_return_allocated() const {
144 return !_conservative && _return_allocated && !_allocated_escapes;
145 }
147 // Tracking of argument modification
149 enum {OFFSET_ANY = -1};
150 bool is_arg_modified(int arg, int offset, int size_in_bytes);
151 void set_arg_modified(int arg, int offset, int size_in_bytes);
152 bool has_non_arg_side_affects() { return _unknown_modified; }
154 // Copy dependencies from this analysis into "deps"
155 void copy_dependencies(Dependencies *deps);
157 #ifndef PRODUCT
158 // dump escape information
159 void dump();
160 #endif
161 };
163 #endif // SHARE_VM_CI_BCESCAPEANALYZER_HPP