Mercurial > hg > truffle
diff src/share/vm/ci/bcEscapeAnalyzer.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 48a3fa21394b |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/ci/bcEscapeAnalyzer.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,145 @@ +/* + * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +define_array(ciObjectArray, ciObject*); +define_stack(ciObjectList, ciObjectArray); + +// 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: + bool _conservative; // If true, return maximally + // conservative results. + ciMethod* _method; + ciMethodData* _methodData; + int _arg_size; + + intStack _stack; + + BitMap _arg_local; + BitMap _arg_stack; + BitMap _arg_returned; + BitMap _dirty; + + bool _return_local; + bool _allocated_escapes; + bool _return_allocated; + + ciObjectList _dependencies; + + ciMethodBlocks *_methodBlocks; + + BCEscapeAnalyzer* _parent; + int _level; + + class ArgumentMap; + class StateInfo; + + // helper functions + bool is_argument(int i) { return i >= 0 && i < _arg_size; } + + void raw_push(int i) { _stack.push(i); } + int raw_pop() { return _stack.is_empty() ? -1 : _stack.pop(); } + void apush(int i) { raw_push(i); } + void spush() { raw_push(-1); } + void lpush() { spush(); spush(); } + int apop() { return raw_pop(); } + void spop() { assert(_stack.is_empty() || _stack.top() == -1, ""); raw_pop(); } + void lpop() { spop(); spop(); } + + void set_returned(ArgumentMap vars); + bool is_argument(ArgumentMap vars); + bool is_arg_stack(ArgumentMap vars); + void clear_bits(ArgumentMap vars, BitMap &bs); + void set_method_escape(ArgumentMap vars); + void set_global_escape(ArgumentMap vars); + void set_dirty(ArgumentMap vars); + + 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; } + ciObjectList* 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.at(i); + } + + // The given argument escapes the callee, but does not become globally + // reachable. + bool is_arg_stack(int i) const { + return !_conservative && _arg_stack.at(i); + } + + // The given argument does not escape globally, and may be returned. + bool is_arg_returned(int i) const { + return !_conservative && _arg_returned.at(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; + } + + // Copy dependencies from this analysis into "deps" + void copy_dependencies(Dependencies *deps); +};