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1783
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1 /*
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 class CompileTask;
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26 class CompileQueue;
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27
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28 class SimpleThresholdPolicy : public CompilationPolicy {
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29 int _c1_count, _c2_count;
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30
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31 // Check if the counter is big enough and set carry (effectively infinity).
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32 inline void set_carry_if_necessary(InvocationCounter *counter);
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33 // Set carry flags in the counters (in methodOop and MDO).
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34 inline void handle_counter_overflow(methodOop method);
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35 // Call and loop predicates determine whether a transition to a higher compilation
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36 // level should be performed (pointers to predicate functions are passed to common_TF().
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37 // Predicates also take compiler load into account.
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38 typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level);
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39 bool call_predicate(int i, int b, CompLevel cur_level);
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40 bool loop_predicate(int i, int b, CompLevel cur_level);
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41 // Common transition function. Given a predicate determines if a method should transition to another level.
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42 CompLevel common(Predicate p, methodOop method, CompLevel cur_level);
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43 // Transition functions.
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44 // call_event determines if a method should be compiled at a different
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45 // level with a regular invocation entry.
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46 CompLevel call_event(methodOop method, CompLevel cur_level);
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47 // loop_event checks if a method should be OSR compiled at a different
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48 // level.
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49 CompLevel loop_event(methodOop method, CompLevel cur_level);
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50
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51 protected:
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52 int c1_count() const { return _c1_count; }
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53 int c2_count() const { return _c2_count; }
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54 void set_c1_count(int x) { _c1_count = x; }
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55 void set_c2_count(int x) { _c2_count = x; }
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56
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57 enum EventType { CALL, LOOP, COMPILE };
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58 void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level);
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59 // Print policy-specific information if necessary
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60 virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { }
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61 // Check if the method can be compiled, change level if necessary
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62 void compile(methodHandle mh, int bci, CompLevel level, TRAPS);
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63 // Submit a given method for compilation
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64 virtual void submit_compile(methodHandle mh, int bci, CompLevel level, TRAPS);
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65 // Simple methods are as good being compiled with C1 as C2.
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66 // This function tells if it's such a function.
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67 inline bool is_trivial(methodOop method);
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68
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69 // Predicate helpers are used by .*_predicate() methods as well as others.
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70 // They check the given counter values, multiplied by the scale against the thresholds.
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71 template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale);
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72 template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale);
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73
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74 // Get a compilation level for a given method.
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75 static CompLevel comp_level(methodOop method) {
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76 nmethod *nm = method->code();
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77 if (nm != NULL && nm->is_in_use()) {
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78 return (CompLevel)nm->comp_level();
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79 }
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80 return CompLevel_none;
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81 }
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82 virtual void method_invocation_event(methodHandle method, methodHandle inlinee,
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83 CompLevel level, TRAPS);
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84 virtual void method_back_branch_event(methodHandle method, methodHandle inlinee,
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85 int bci, CompLevel level, TRAPS);
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86 public:
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87 SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }
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88 virtual int compiler_count(CompLevel comp_level) {
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89 if (is_c1_compile(comp_level)) return c1_count();
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90 if (is_c2_compile(comp_level)) return c2_count();
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91 return 0;
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92 }
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93 virtual void do_safepoint_work() { }
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94 virtual void delay_compilation(methodOop method) { }
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95 virtual void disable_compilation(methodOop method) { }
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96 // TODO: we should honour reprofiling requests in the future. Currently reprofiling
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97 // would happen but not to the extent we would ideally like.
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98 virtual void reprofile(ScopeDesc* trap_scope, bool is_osr) { }
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99 virtual nmethod* event(methodHandle method, methodHandle inlinee,
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100 int branch_bci, int bci, CompLevel comp_level, TRAPS);
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101 // Select task is called by CompileBroker. We should return a task or NULL.
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102 virtual CompileTask* select_task(CompileQueue* compile_queue);
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103 // Tell the runtime if we think a given method is adequately profiled.
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104 virtual bool is_mature(methodOop method);
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105 // Initialize: set compiler thread count
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106 virtual void initialize();
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107 };
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