Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.hpp @ 14518:d8041d695d19
Merged with jdk9/dev/hotspot changeset 3812c088b945
| author | twisti |
|---|---|
| date | Tue, 11 Mar 2014 18:45:59 -0700 |
| parents | de6a9e811145 |
| children | 4ca6dc0799b6 |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CI_BCESCAPEANALYZER_HPP |
| 26 #define SHARE_VM_CI_BCESCAPEANALYZER_HPP | |
| 27 | |
| 28 #ifdef COMPILER2 | |
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29 #include "ci/ciObject.hpp" |
| 1972 | 30 #include "ci/ciMethod.hpp" |
| 31 #include "ci/ciMethodData.hpp" | |
| 32 #include "code/dependencies.hpp" | |
| 33 #include "libadt/vectset.hpp" | |
| 34 #include "memory/allocation.hpp" | |
| 35 #include "utilities/growableArray.hpp" | |
| 36 #endif | |
| 37 | |
| 0 | 38 // This class implements a fast, conservative analysis of effect of methods |
| 39 // on the escape state of their arguments. The analysis is at the bytecode | |
| 40 // level. | |
| 41 | |
| 42 class ciMethodBlocks; | |
| 43 class ciBlock; | |
| 44 | |
| 45 class BCEscapeAnalyzer : public ResourceObj { | |
| 46 private: | |
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47 Arena* _arena; // ciEnv arena |
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48 |
| 0 | 49 bool _conservative; // If true, return maximally |
| 50 // conservative results. | |
| 51 ciMethod* _method; | |
| 52 ciMethodData* _methodData; | |
| 53 int _arg_size; | |
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54 VectorSet _arg_local; |
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55 VectorSet _arg_stack; |
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56 VectorSet _arg_returned; |
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57 VectorSet _dirty; |
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58 enum{ ARG_OFFSET_MAX = 31}; |
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59 uint *_arg_modified; |
| 0 | 60 |
| 61 bool _return_local; | |
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62 bool _return_allocated; |
| 0 | 63 bool _allocated_escapes; |
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64 bool _unknown_modified; |
| 0 | 65 |
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66 GrowableArray<ciMetadata *> _dependencies; |
| 0 | 67 |
| 68 ciMethodBlocks *_methodBlocks; | |
| 69 | |
| 70 BCEscapeAnalyzer* _parent; | |
| 71 int _level; | |
| 72 | |
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73 public: |
| 0 | 74 class ArgumentMap; |
| 75 class StateInfo; | |
| 76 | |
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77 private: |
| 0 | 78 // helper functions |
| 79 bool is_argument(int i) { return i >= 0 && i < _arg_size; } | |
| 80 void set_returned(ArgumentMap vars); | |
| 81 bool is_argument(ArgumentMap vars); | |
| 82 bool is_arg_stack(ArgumentMap vars); | |
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83 bool returns_all(ArgumentMap vars); |
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84 void clear_bits(ArgumentMap vars, VectorSet &bs); |
| 0 | 85 void set_method_escape(ArgumentMap vars); |
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86 void set_global_escape(ArgumentMap vars, bool merge = false); |
| 0 | 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; } | |
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119 GrowableArray<ciMetadata *>* dependencies() { return &_dependencies; } |
| 0 | 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 { | |
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126 return !_conservative && _arg_local.test(i); |
| 0 | 127 } |
| 128 | |
| 129 // The given argument escapes the callee, but does not become globally | |
| 130 // reachable. | |
| 131 bool is_arg_stack(int i) const { | |
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132 return !_conservative && _arg_stack.test(i); |
| 0 | 133 } |
| 134 | |
| 135 // The given argument does not escape globally, and may be returned. | |
| 136 bool is_arg_returned(int i) const { | |
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137 return !_conservative && _arg_returned.test(i); } |
| 0 | 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 }; |
| 1972 | 164 |
| 165 #endif // SHARE_VM_CI_BCESCAPEANALYZER_HPP |