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src/share/vm/ci/bcEscapeAnalyzer.hpp@8099e71601df (annotated)

src/share/vm/ci/bcEscapeAnalyzer.hpp

Wed, 14 Jul 2010 14:47:34 -0700

author

kvn

date

Wed, 14 Jul 2010 14:47:34 -0700

changeset 2003

8099e71601df

parent 1907

c18cbe5936b8

child 2314

f95d63e2154a

permissions

-rw-r--r--

6968368: SIGSEGV in the BCEscapeAnalyzer::copy_dependencies
Summary: Use GrowableArray and VectorSet allocated in ciEnv arena.
Reviewed-by: never, twisti

duke@435	1	/*
trims@1907	2	* Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// This class implements a fast, conservative analysis of effect of methods
duke@435	26	// on the escape state of their arguments. The analysis is at the bytecode
duke@435	27	// level.
duke@435	28
duke@435	29	class ciMethodBlocks;
duke@435	30	class ciBlock;
duke@435	31
duke@435	32	class BCEscapeAnalyzer : public ResourceObj {
duke@435	33	private:
kvn@2003	34	Arena* _arena; // ciEnv arena
kvn@2003	35
duke@435	36	bool _conservative; // If true, return maximally
duke@435	37	// conservative results.
duke@435	38	ciMethod* _method;
duke@435	39	ciMethodData* _methodData;
duke@435	40	int _arg_size;
kvn@2003	41	VectorSet _arg_local;
kvn@2003	42	VectorSet _arg_stack;
kvn@2003	43	VectorSet _arg_returned;
kvn@2003	44	VectorSet _dirty;
kvn@480	45	enum{ ARG_OFFSET_MAX = 31};
kvn@480	46	uint *_arg_modified;
duke@435	47
duke@435	48	bool _return_local;
kvn@513	49	bool _return_allocated;
duke@435	50	bool _allocated_escapes;
kvn@480	51	bool _unknown_modified;
duke@435	52
kvn@2003	53	GrowableArray<ciObject *> _dependencies;
duke@435	54
duke@435	55	ciMethodBlocks *_methodBlocks;
duke@435	56
duke@435	57	BCEscapeAnalyzer* _parent;
duke@435	58	int _level;
duke@435	59
phh@1558	60	public:
duke@435	61	class ArgumentMap;
duke@435	62	class StateInfo;
duke@435	63
phh@1558	64	private:
duke@435	65	// helper functions
duke@435	66	bool is_argument(int i) { return i >= 0 && i < _arg_size; }
duke@435	67	void set_returned(ArgumentMap vars);
duke@435	68	bool is_argument(ArgumentMap vars);
duke@435	69	bool is_arg_stack(ArgumentMap vars);
kvn@2003	70	void clear_bits(ArgumentMap vars, VectorSet &bs);
duke@435	71	void set_method_escape(ArgumentMap vars);
duke@435	72	void set_global_escape(ArgumentMap vars);
duke@435	73	void set_dirty(ArgumentMap vars);
kvn@480	74	void set_modified(ArgumentMap vars, int offs, int size);
duke@435	75
duke@435	76	bool is_recursive_call(ciMethod* callee);
duke@435	77	void add_dependence(ciKlass *klass, ciMethod *meth);
duke@435	78	void propagate_dependencies(ciMethod *meth);
duke@435	79	void invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder);
duke@435	80
duke@435	81	void iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors);
duke@435	82	void iterate_blocks(Arena *);
duke@435	83	void merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state);
duke@435	84
duke@435	85	// analysis
duke@435	86	void initialize();
duke@435	87	void clear_escape_info();
duke@435	88	void compute_escape_info();
duke@435	89	vmIntrinsics::ID known_intrinsic();
duke@435	90	bool compute_escape_for_intrinsic(vmIntrinsics::ID iid);
duke@435	91	bool do_analysis();
duke@435	92
duke@435	93	void read_escape_info();
duke@435	94
duke@435	95	bool contains(uint arg_set1, uint arg_set2);
duke@435	96
duke@435	97	public:
duke@435	98	BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent = NULL);
duke@435	99
duke@435	100	// accessors
duke@435	101	ciMethod* method() const { return _method; }
duke@435	102	ciMethodData* methodData() const { return _methodData; }
duke@435	103	BCEscapeAnalyzer* parent() const { return _parent; }
duke@435	104	int level() const { return _level; }
kvn@2003	105	GrowableArray<ciObject *>* dependencies() { return &_dependencies; }
duke@435	106	bool has_dependencies() const { return !_dependencies.is_empty(); }
duke@435	107
duke@435	108	// retrieval of interprocedural escape information
duke@435	109
duke@435	110	// The given argument does not escape the callee.
duke@435	111	bool is_arg_local(int i) const {
kvn@2003	112	return !_conservative && _arg_local.test(i);
duke@435	113	}
duke@435	114
duke@435	115	// The given argument escapes the callee, but does not become globally
duke@435	116	// reachable.
duke@435	117	bool is_arg_stack(int i) const {
kvn@2003	118	return !_conservative && _arg_stack.test(i);
duke@435	119	}
duke@435	120
duke@435	121	// The given argument does not escape globally, and may be returned.
duke@435	122	bool is_arg_returned(int i) const {
kvn@2003	123	return !_conservative && _arg_returned.test(i); }
duke@435	124
duke@435	125	// True iff only input arguments are returned.
duke@435	126	bool is_return_local() const {
duke@435	127	return !_conservative && _return_local;
duke@435	128	}
duke@435	129
duke@435	130	// True iff only newly allocated unescaped objects are returned.
duke@435	131	bool is_return_allocated() const {
duke@435	132	return !_conservative && _return_allocated && !_allocated_escapes;
duke@435	133	}
duke@435	134
kvn@480	135	// Tracking of argument modification
kvn@480	136
kvn@480	137	enum {OFFSET_ANY = -1};
kvn@480	138	bool is_arg_modified(int arg, int offset, int size_in_bytes);
kvn@480	139	void set_arg_modified(int arg, int offset, int size_in_bytes);
kvn@480	140	bool has_non_arg_side_affects() { return _unknown_modified; }
kvn@480	141
duke@435	142	// Copy dependencies from this analysis into "deps"
duke@435	143	void copy_dependencies(Dependencies *deps);
kvn@513	144
kvn@513	145	#ifndef PRODUCT
kvn@513	146	// dump escape information
kvn@513	147	void dump();
kvn@513	148	#endif
duke@435	149	};