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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 |