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1 /*
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2 * Copyright 2000-2006 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 // The CompilationPolicy selects which method (if any) should be compiled.
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26 // It also decides which methods must always be compiled (i.e., are never
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27 // interpreted).
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28
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29 class CompilationPolicy : public CHeapObj {
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30 private:
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31 static CompilationPolicy* _policy;
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32 // Accumulated time
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33 static elapsedTimer _accumulated_time;
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34
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35 static bool _in_vm_startup;
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36
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37 public:
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38 virtual void method_invocation_event(methodHandle m, TRAPS) = 0;
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39 virtual void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS) = 0;
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40 virtual int compilation_level(methodHandle m, int branch_bci) = 0;
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41
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42 void reset_counter_for_invocation_event(methodHandle method);
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43 void reset_counter_for_back_branch_event(methodHandle method);
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44
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45 static void set_in_vm_startup(bool in_vm_startup) { _in_vm_startup = in_vm_startup; }
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46 static void completed_vm_startup();
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47 static bool delayCompilationDuringStartup() { return _in_vm_startup; }
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48
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49 static bool mustBeCompiled(methodHandle m); // m must be compiled before executing it
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50 static bool canBeCompiled(methodHandle m); // m is allowed to be compiled
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51
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52 static void set_policy(CompilationPolicy* policy) { _policy = policy; }
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53 static CompilationPolicy* policy() { return _policy; }
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54
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55 // Profiling
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56 elapsedTimer* accumulated_time() { return &_accumulated_time; }
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57 void print_time() PRODUCT_RETURN;
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58 };
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59
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60 class SimpleCompPolicy : public CompilationPolicy {
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61 public:
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62 void method_invocation_event( methodHandle m, TRAPS);
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63 void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS);
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64 int compilation_level(methodHandle m, int branch_bci);
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65 };
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66
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67 // StackWalkCompPolicy - existing C2 policy
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68
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69 #ifdef COMPILER2
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70 class StackWalkCompPolicy : public CompilationPolicy {
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71 public:
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72 void method_invocation_event(methodHandle m, TRAPS);
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73 void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS);
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74 int compilation_level(methodHandle m, int branch_bci);
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75
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76 private:
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77 RFrame* findTopInlinableFrame(GrowableArray<RFrame*>* stack);
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78 RFrame* senderOf(RFrame* rf, GrowableArray<RFrame*>* stack);
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79
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80 // the following variables hold values computed by the last inlining decision
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81 // they are used for performance debugging only (print better messages)
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82 static const char* _msg; // reason for not inlining
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83
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84 static const char* shouldInline (methodHandle callee, float frequency, int cnt);
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85 // positive filter: should send be inlined? returns NULL (--> yes) or rejection msg
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86 static const char* shouldNotInline(methodHandle callee);
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87 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg
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88
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89 };
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90 #endif
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