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src/share/vm/ci/bcEscapeAnalyzer.hpp@710a3c8b516e (annotated)

src/share/vm/ci/bcEscapeAnalyzer.hpp

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 6198

55fb97c4c58d

parent 0

f90c822e73f8

child 9756

2be326848943

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_CI_BCESCAPEANALYZER_HPP
aoqi@0	26	#define SHARE_VM_CI_BCESCAPEANALYZER_HPP
aoqi@0	27
aoqi@0	28	#ifdef COMPILER2
aoqi@0	29	#include "ci/ciObject.hpp"
aoqi@0	30	#include "ci/ciMethod.hpp"
aoqi@0	31	#include "ci/ciMethodData.hpp"
aoqi@0	32	#include "code/dependencies.hpp"
aoqi@0	33	#include "libadt/vectset.hpp"
aoqi@0	34	#include "memory/allocation.hpp"
aoqi@0	35	#include "utilities/growableArray.hpp"
aoqi@0	36	#endif
aoqi@0	37
aoqi@0	38	// This class implements a fast, conservative analysis of effect of methods
aoqi@0	39	// on the escape state of their arguments. The analysis is at the bytecode
aoqi@0	40	// level.
aoqi@0	41
aoqi@0	42	class ciMethodBlocks;
aoqi@0	43	class ciBlock;
aoqi@0	44
aoqi@0	45	class BCEscapeAnalyzer : public ResourceObj {
aoqi@0	46	private:
aoqi@0	47	Arena* _arena; // ciEnv arena
aoqi@0	48
aoqi@0	49	bool _conservative; // If true, return maximally
aoqi@0	50	// conservative results.
aoqi@0	51	ciMethod* _method;
aoqi@0	52	ciMethodData* _methodData;
aoqi@0	53	int _arg_size;
aoqi@0	54	VectorSet _arg_local;
aoqi@0	55	VectorSet _arg_stack;
aoqi@0	56	VectorSet _arg_returned;
aoqi@0	57	VectorSet _dirty;
aoqi@0	58	enum{ ARG_OFFSET_MAX = 31};
aoqi@0	59	uint *_arg_modified;
aoqi@0	60
aoqi@0	61	bool _return_local;
aoqi@0	62	bool _return_allocated;
aoqi@0	63	bool _allocated_escapes;
aoqi@0	64	bool _unknown_modified;
aoqi@0	65
aoqi@0	66	GrowableArray<ciMetadata *> _dependencies;
aoqi@0	67
aoqi@0	68	ciMethodBlocks *_methodBlocks;
aoqi@0	69
aoqi@0	70	BCEscapeAnalyzer* _parent;
aoqi@0	71	int _level;
aoqi@0	72
aoqi@0	73	public:
aoqi@0	74	class ArgumentMap;
aoqi@0	75	class StateInfo;
aoqi@0	76
aoqi@0	77	private:
aoqi@0	78	// helper functions
aoqi@0	79	bool is_argument(int i) { return i >= 0 && i < _arg_size; }
aoqi@0	80	void set_returned(ArgumentMap vars);
aoqi@0	81	bool is_argument(ArgumentMap vars);
aoqi@0	82	bool is_arg_stack(ArgumentMap vars);
aoqi@0	83	bool returns_all(ArgumentMap vars);
aoqi@0	84	void clear_bits(ArgumentMap vars, VectorSet &bs);
aoqi@0	85	void set_method_escape(ArgumentMap vars);
aoqi@0	86	void set_global_escape(ArgumentMap vars, bool merge = false);
aoqi@0	87	void set_dirty(ArgumentMap vars);
aoqi@0	88	void set_modified(ArgumentMap vars, int offs, int size);
aoqi@0	89
aoqi@0	90	bool is_recursive_call(ciMethod* callee);
aoqi@0	91	void add_dependence(ciKlass *klass, ciMethod *meth);
aoqi@0	92	void propagate_dependencies(ciMethod *meth);
aoqi@0	93	void invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder);
aoqi@0	94
aoqi@0	95	void iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors);
aoqi@0	96	void iterate_blocks(Arena *);
aoqi@0	97	void merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state);
aoqi@0	98
aoqi@0	99	// analysis
aoqi@0	100	void initialize();
aoqi@0	101	void clear_escape_info();
aoqi@0	102	void compute_escape_info();
aoqi@0	103	vmIntrinsics::ID known_intrinsic();
aoqi@0	104	bool compute_escape_for_intrinsic(vmIntrinsics::ID iid);
aoqi@0	105	bool do_analysis();
aoqi@0	106
aoqi@0	107	void read_escape_info();
aoqi@0	108
aoqi@0	109	bool contains(uint arg_set1, uint arg_set2);
aoqi@0	110
aoqi@0	111	public:
aoqi@0	112	BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL);
aoqi@0	113
aoqi@0	114	// accessors
aoqi@0	115	ciMethod* method() const { return _method; }
aoqi@0	116	ciMethodData* methodData() const { return _methodData; }
aoqi@0	117	BCEscapeAnalyzer* parent() const { return _parent; }
aoqi@0	118	int level() const { return _level; }
aoqi@0	119	GrowableArray<ciMetadata *>* dependencies() { return &_dependencies; }
aoqi@0	120	bool has_dependencies() const { return !_dependencies.is_empty(); }
aoqi@0	121
aoqi@0	122	// retrieval of interprocedural escape information
aoqi@0	123
aoqi@0	124	// The given argument does not escape the callee.
aoqi@0	125	bool is_arg_local(int i) const {
aoqi@0	126	return !_conservative && _arg_local.test(i);
aoqi@0	127	}
aoqi@0	128
aoqi@0	129	// The given argument escapes the callee, but does not become globally
aoqi@0	130	// reachable.
aoqi@0	131	bool is_arg_stack(int i) const {
aoqi@0	132	return !_conservative && _arg_stack.test(i);
aoqi@0	133	}
aoqi@0	134
aoqi@0	135	// The given argument does not escape globally, and may be returned.
aoqi@0	136	bool is_arg_returned(int i) const {
aoqi@0	137	return !_conservative && _arg_returned.test(i); }
aoqi@0	138
aoqi@0	139	// True iff only input arguments are returned.
aoqi@0	140	bool is_return_local() const {
aoqi@0	141	return !_conservative && _return_local;
aoqi@0	142	}
aoqi@0	143
aoqi@0	144	// True iff only newly allocated unescaped objects are returned.
aoqi@0	145	bool is_return_allocated() const {
aoqi@0	146	return !_conservative && _return_allocated && !_allocated_escapes;
aoqi@0	147	}
aoqi@0	148
aoqi@0	149	// Tracking of argument modification
aoqi@0	150
aoqi@0	151	enum {OFFSET_ANY = -1};
aoqi@0	152	bool is_arg_modified(int arg, int offset, int size_in_bytes);
aoqi@0	153	void set_arg_modified(int arg, int offset, int size_in_bytes);
aoqi@0	154	bool has_non_arg_side_affects() { return _unknown_modified; }
aoqi@0	155
aoqi@0	156	// Copy dependencies from this analysis into "deps"
aoqi@0	157	void copy_dependencies(Dependencies *deps);
aoqi@0	158
aoqi@0	159	#ifndef PRODUCT
aoqi@0	160	// dump escape information
aoqi@0	161	void dump();
aoqi@0	162	#endif
aoqi@0	163	};
aoqi@0	164
aoqi@0	165	#endif // SHARE_VM_CI_BCESCAPEANALYZER_HPP