| /* |
| * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_CI_BCESCAPEANALYZER_HPP |
| #define SHARE_VM_CI_BCESCAPEANALYZER_HPP |
| |
| #ifdef COMPILER2 |
| #include "ci/ciObject.hpp" |
| #include "ci/ciMethod.hpp" |
| #include "ci/ciMethodData.hpp" |
| #include "code/dependencies.hpp" |
| #include "libadt/vectset.hpp" |
| #include "memory/allocation.hpp" |
| #include "utilities/growableArray.hpp" |
| #endif |
| |
| // This class implements a fast, conservative analysis of effect of methods |
| // on the escape state of their arguments. The analysis is at the bytecode |
| // level. |
| |
| class ciMethodBlocks; |
| class ciBlock; |
| |
| class BCEscapeAnalyzer : public ResourceObj { |
| private: |
| Arena* _arena; // ciEnv arena |
| |
| bool _conservative; // If true, return maximally |
| // conservative results. |
| ciMethod* _method; |
| ciMethodData* _methodData; |
| int _arg_size; |
| VectorSet _arg_local; |
| VectorSet _arg_stack; |
| VectorSet _arg_returned; |
| VectorSet _dirty; |
| enum{ ARG_OFFSET_MAX = 31}; |
| uint *_arg_modified; |
| |
| bool _return_local; |
| bool _return_allocated; |
| bool _allocated_escapes; |
| bool _unknown_modified; |
| |
| GrowableArray<ciMetadata *> _dependencies; |
| |
| ciMethodBlocks *_methodBlocks; |
| |
| BCEscapeAnalyzer* _parent; |
| int _level; |
| |
| public: |
| class ArgumentMap; |
| class StateInfo; |
| |
| private: |
| // helper functions |
| bool is_argument(int i) { return i >= 0 && i < _arg_size; } |
| void set_returned(ArgumentMap vars); |
| bool is_argument(ArgumentMap vars); |
| bool is_arg_stack(ArgumentMap vars); |
| bool returns_all(ArgumentMap vars); |
| void clear_bits(ArgumentMap vars, VectorSet &bs); |
| void set_method_escape(ArgumentMap vars); |
| void set_global_escape(ArgumentMap vars, bool merge = false); |
| void set_dirty(ArgumentMap vars); |
| void set_modified(ArgumentMap vars, int offs, int size); |
| |
| bool is_recursive_call(ciMethod* callee); |
| void add_dependence(ciKlass *klass, ciMethod *meth); |
| void propagate_dependencies(ciMethod *meth); |
| void invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder); |
| |
| void iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors); |
| void iterate_blocks(Arena *); |
| void merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state); |
| |
| // analysis |
| void initialize(); |
| void clear_escape_info(); |
| void compute_escape_info(); |
| vmIntrinsics::ID known_intrinsic(); |
| bool compute_escape_for_intrinsic(vmIntrinsics::ID iid); |
| bool do_analysis(); |
| |
| void read_escape_info(); |
| |
| bool contains(uint arg_set1, uint arg_set2); |
| |
| public: |
| BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL); |
| |
| // accessors |
| ciMethod* method() const { return _method; } |
| ciMethodData* methodData() const { return _methodData; } |
| BCEscapeAnalyzer* parent() const { return _parent; } |
| int level() const { return _level; } |
| GrowableArray<ciMetadata *>* dependencies() { return &_dependencies; } |
| bool has_dependencies() const { return !_dependencies.is_empty(); } |
| |
| // retrieval of interprocedural escape information |
| |
| // The given argument does not escape the callee. |
| bool is_arg_local(int i) const { |
| return !_conservative && _arg_local.test(i); |
| } |
| |
| // The given argument escapes the callee, but does not become globally |
| // reachable. |
| bool is_arg_stack(int i) const { |
| return !_conservative && _arg_stack.test(i); |
| } |
| |
| // The given argument does not escape globally, and may be returned. |
| bool is_arg_returned(int i) const { |
| return !_conservative && _arg_returned.test(i); } |
| |
| // True iff only input arguments are returned. |
| bool is_return_local() const { |
| return !_conservative && _return_local; |
| } |
| |
| // True iff only newly allocated unescaped objects are returned. |
| bool is_return_allocated() const { |
| return !_conservative && _return_allocated && !_allocated_escapes; |
| } |
| |
| // Tracking of argument modification |
| |
| enum {OFFSET_ANY = -1}; |
| bool is_arg_modified(int arg, int offset, int size_in_bytes); |
| void set_arg_modified(int arg, int offset, int size_in_bytes); |
| bool has_non_arg_side_affects() { return _unknown_modified; } |
| |
| // Copy dependencies from this analysis into "deps" |
| void copy_dependencies(Dependencies *deps); |
| |
| #ifndef PRODUCT |
| // dump escape information |
| void dump(); |
| #endif |
| }; |
| |
| #endif // SHARE_VM_CI_BCESCAPEANALYZER_HPP |