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src/share/vm/ci/ciCallProfile.hpp@c775af091fe9 (annotated)

src/share/vm/ci/ciCallProfile.hpp

Mon, 07 Oct 2013 10:41:56 -0700

author

twisti

date

Mon, 07 Oct 2013 10:41:56 -0700

changeset 5907

c775af091fe9

parent 3105

c26de9aef2ed

child 6876

710a3c8b516e

permissions

-rw-r--r--

8025566: EXCEPTION_ACCESS_VIOLATION in compiled by C1 String.valueOf method
Reviewed-by: kvn

duke@435	1	/*
stefank@2314	2	* Copyright (c) 1999, 2010, 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
stefank@2314	25	#ifndef SHARE_VM_CI_CICALLPROFILE_HPP
stefank@2314	26	#define SHARE_VM_CI_CICALLPROFILE_HPP
stefank@2314	27
stefank@2314	28	#include "ci/ciClassList.hpp"
stefank@2325	29	#include "memory/allocation.hpp"
stefank@2314	30
duke@435	31	// ciCallProfile
duke@435	32	//
duke@435	33	// This class is used to determine the frequently called method
duke@435	34	// at some call site
duke@435	35	class ciCallProfile : StackObj {
duke@435	36	private:
duke@435	37	// Fields are initialized directly by ciMethod::call_profile_at_bci.
duke@435	38	friend class ciMethod;
never@2949	39	friend class ciMethodHandle;
duke@435	40
duke@435	41	enum { MorphismLimit = 2 }; // Max call site's morphism we care about
duke@435	42	int _limit; // number of receivers have been determined
duke@435	43	int _morphism; // determined call site's morphism
duke@435	44	int _count; // # times has this call been executed
duke@435	45	int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
duke@435	46	ciMethod* _method[MorphismLimit + 1]; // receivers methods
duke@435	47	ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
duke@435	48
duke@435	49	ciCallProfile() {
duke@435	50	_limit = 0;
duke@435	51	_morphism = 0;
duke@435	52	_count = -1;
duke@435	53	_receiver_count[0] = -1;
duke@435	54	_method[0] = NULL;
duke@435	55	_receiver[0] = NULL;
duke@435	56	}
duke@435	57
duke@435	58	void add_receiver(ciKlass* receiver, int receiver_count);
duke@435	59
duke@435	60	public:
duke@435	61	// Note: The following predicates return false for invalid profiles:
never@2949	62	bool has_receiver(int i) const { return _limit > i; }
never@2949	63	int morphism() const { return _morphism; }
duke@435	64
never@2949	65	int count() const { return _count; }
duke@435	66	int receiver_count(int i) {
duke@435	67	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	68	return _receiver_count[i];
duke@435	69	}
duke@435	70	float receiver_prob(int i) {
duke@435	71	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	72	return (float)_receiver_count[i]/(float)_count;
duke@435	73	}
duke@435	74	ciMethod* method(int i) {
duke@435	75	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	76	return _method[i];
duke@435	77	}
duke@435	78	ciKlass* receiver(int i) {
duke@435	79	assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435	80	return _receiver[i];
duke@435	81	}
never@3105	82
never@3105	83	// Rescale the current profile based on the incoming scale
never@3105	84	ciCallProfile rescale(double scale) {
never@3105	85	assert(scale >= 0 && scale <= 1.0, "out of range");
never@3105	86	ciCallProfile call = *this;
never@3105	87	call._count = (int)(call._count * scale);
never@3105	88	for (int i = 0; i < _morphism; i++) {
never@3105	89	call._receiver_count[i] = (int)(call._receiver_count[i] * scale);
never@3105	90	}
never@3105	91	return call;
never@3105	92	}
duke@435	93	};
stefank@2314	94
stefank@2314	95	#endif // SHARE_VM_CI_CICALLPROFILE_HPP