Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.hpp @ 1602:136b78722a08
6939203: JSR 292 needs method handle constants
Summary: Add new CP types CONSTANT_MethodHandle, CONSTANT_MethodType; extend 'ldc' bytecode.
Reviewed-by: twisti, never
| author | jrose |
|---|---|
| date | Wed, 09 Jun 2010 18:50:45 -0700 |
| parents | c18cbe5936b8 |
| children | 8099e71601df |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2008, 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 | |
| 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 }; |