1 /* 2 * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP 26 #define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP 27 28 #include "code/nmethod.hpp" 29 #include "oops/methodData.hpp" 30 #include "runtime/compilationPolicy.hpp" 31 #include "utilities/globalDefinitions.hpp" 32 33 class CompileTask; 34 class CompileQueue; 35 36 class SimpleThresholdPolicy : public CompilationPolicy { 37 int _c1_count, _c2_count; 38 39 // Check if the counter is big enough and set carry (effectively infinity). 40 inline void set_carry_if_necessary(InvocationCounter *counter); 41 // Set carry flags in the counters (in Method* and MDO). 42 inline void handle_counter_overflow(Method* method); 43 // Call and loop predicates determine whether a transition to a higher compilation 44 // level should be performed (pointers to predicate functions are passed to common_TF(). 45 // Predicates also take compiler load into account. 46 typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level, Method* method); 47 bool call_predicate(int i, int b, CompLevel cur_level, Method* method); 48 bool loop_predicate(int i, int b, CompLevel cur_level, Method* method); 49 // Common transition function. Given a predicate determines if a method should transition to another level. 50 CompLevel common(Predicate p, Method* method, CompLevel cur_level); 51 // Transition functions. 52 // call_event determines if a method should be compiled at a different 53 // level with a regular invocation entry. 54 CompLevel call_event(Method* method, CompLevel cur_level, JavaThread* thread); 55 // loop_event checks if a method should be OSR compiled at a different 56 // level. 57 CompLevel loop_event(Method* method, CompLevel cur_level, JavaThread* thread); 58 void print_counters(const char* prefix, methodHandle mh); 59 protected: 60 int c1_count() const { return _c1_count; } 61 int c2_count() const { return _c2_count; } 62 void set_c1_count(int x) { _c1_count = x; } 63 void set_c2_count(int x) { _c2_count = x; } 64 65 enum EventType { CALL, LOOP, COMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT }; 66 void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level); 67 // Print policy-specific information if necessary 68 virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { } 69 // Check if the method can be compiled, change level if necessary 70 void compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread); 71 // Submit a given method for compilation 72 virtual void submit_compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread); 73 // Simple methods are as good being compiled with C1 as C2. 74 // This function tells if it's such a function. 75 inline bool is_trivial(Method* method); 76 77 // Predicate helpers are used by .*_predicate() methods as well as others. 78 // They check the given counter values, multiplied by the scale against the thresholds. 79 template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale, Method* method); 80 template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale, Method* method); 81 82 // Get a compilation level for a given method. 83 static CompLevel comp_level(Method* method) { 84 CompiledMethod *nm = method->code(); 85 if (nm != NULL && nm->is_in_use()) { 86 return (CompLevel)nm->comp_level(); 87 } 88 return CompLevel_none; 89 } 90 virtual void method_invocation_event(const methodHandle& method, const methodHandle& inlinee, 91 CompLevel level, CompiledMethod* nm, JavaThread* thread); 92 virtual void method_back_branch_event(const methodHandle& method, const methodHandle& inlinee, 93 int bci, CompLevel level, CompiledMethod* nm, JavaThread* thread); 94 public: 95 SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { } 96 virtual int compiler_count(CompLevel comp_level) { 97 if (is_c1_compile(comp_level)) return c1_count(); 98 if (is_c2_compile(comp_level)) return c2_count(); 99 return 0; 100 } 101 virtual CompLevel initial_compile_level() { return MIN2((CompLevel)TieredStopAtLevel, CompLevel_initial_compile); } 102 virtual void do_safepoint_work() { } 103 virtual void delay_compilation(Method* method) { } 104 virtual void disable_compilation(Method* method) { } 105 virtual void reprofile(ScopeDesc* trap_scope, bool is_osr); 106 virtual nmethod* event(const methodHandle& method, const methodHandle& inlinee, 107 int branch_bci, int bci, CompLevel comp_level, CompiledMethod* nm, JavaThread* thread); 108 // Select task is called by CompileBroker. We should return a task or NULL. 109 virtual CompileTask* select_task(CompileQueue* compile_queue); 110 // Tell the runtime if we think a given method is adequately profiled. 111 virtual bool is_mature(Method* method); 112 // Initialize: set compiler thread count 113 virtual void initialize(); 114 virtual bool should_not_inline(ciEnv* env, ciMethod* callee) { 115 return (env->comp_level() == CompLevel_limited_profile || 116 env->comp_level() == CompLevel_full_profile) && 117 callee->has_loops(); 118 } 119 }; 120 121 #endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP