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1 /*
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2 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // ciCallProfile
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26 //
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27 // This class is used to determine the frequently called method
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28 // at some call site
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29 class ciCallProfile : StackObj {
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30 private:
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31 // Fields are initialized directly by ciMethod::call_profile_at_bci.
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32 friend class ciMethod;
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33
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34 enum { MorphismLimit = 2 }; // Max call site's morphism we care about
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35 int _limit; // number of receivers have been determined
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36 int _morphism; // determined call site's morphism
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37 int _count; // # times has this call been executed
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38 int _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
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39 ciMethod* _method[MorphismLimit + 1]; // receivers methods
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40 ciKlass* _receiver[MorphismLimit + 1]; // receivers (exact)
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41
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42 ciCallProfile() {
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43 _limit = 0;
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44 _morphism = 0;
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45 _count = -1;
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46 _receiver_count[0] = -1;
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47 _method[0] = NULL;
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48 _receiver[0] = NULL;
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49 }
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50
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51 void add_receiver(ciKlass* receiver, int receiver_count);
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52
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53 public:
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54 // Note: The following predicates return false for invalid profiles:
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55 bool has_receiver(int i) { return _limit > i; }
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56 int morphism() { return _morphism; }
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57
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58 int count() { return _count; }
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59 int receiver_count(int i) {
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60 assert(i < _limit, "out of Call Profile MorphismLimit");
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61 return _receiver_count[i];
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62 }
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63 float receiver_prob(int i) {
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64 assert(i < _limit, "out of Call Profile MorphismLimit");
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65 return (float)_receiver_count[i]/(float)_count;
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66 }
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67 ciMethod* method(int i) {
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68 assert(i < _limit, "out of Call Profile MorphismLimit");
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69 return _method[i];
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70 }
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71 ciKlass* receiver(int i) {
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72 assert(i < _limit, "out of Call Profile MorphismLimit");
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73 return _receiver[i];
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74 }
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75 };
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