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src/share/vm/ci/ciCallProfile.hpp@a61af66fc99e (annotated)

src/share/vm/ci/ciCallProfile.hpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

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duke@435	1	/*
duke@435	2	* Copyright 1999-2006 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// ciCallProfile
duke@435	26	//
duke@435	27	// This class is used to determine the frequently called method
duke@435	28	// at some call site
duke@435	29	class ciCallProfile : StackObj {
duke@435	30	private:
duke@435	31	// Fields are initialized directly by ciMethod::call_profile_at_bci.
duke@435	32	friend class ciMethod;
duke@435	33
duke@435	34	enum { MorphismLimit = 2 }; // Max call site's morphism we care about
duke@435	35	int _limit; // number of receivers have been determined
duke@435	36	int _morphism; // determined call site's morphism
duke@435	37	int _count; // # times has this call been executed
duke@435	38	int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
duke@435	39	ciMethod* _method[MorphismLimit + 1]; // receivers methods
duke@435	40	ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
duke@435	41
duke@435	42	ciCallProfile() {
duke@435	43	_limit = 0;
duke@435	44	_morphism = 0;
duke@435	45	_count = -1;
duke@435	46	_receiver_count[0] = -1;
duke@435	47	_method[0] = NULL;
duke@435	48	_receiver[0] = NULL;
duke@435	49	}
duke@435	50
duke@435	51	void add_receiver(ciKlass* receiver, int receiver_count);
duke@435	52
duke@435	53	public:
duke@435	54	// Note: The following predicates return false for invalid profiles:
duke@435	55	bool has_receiver(int i) { return _limit > i; }
duke@435	56	int morphism() { return _morphism; }
duke@435	57
duke@435	58	int count() { return _count; }
duke@435	59	int receiver_count(int i) {
duke@435	60	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	61	return _receiver_count[i];
duke@435	62	}
duke@435	63	float receiver_prob(int i) {
duke@435	64	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	65	return (float)_receiver_count[i]/(float)_count;
duke@435	66	}
duke@435	67	ciMethod* method(int i) {
duke@435	68	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	69	return _method[i];
duke@435	70	}
duke@435	71	ciKlass* receiver(int i) {
duke@435	72	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	73	return _receiver[i];
duke@435	74	}
duke@435	75	};