1 /* 2 * Copyright (c) 2000, 2010, 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_COMPILATIONPOLICY_HPP 26 #define SHARE_VM_RUNTIME_COMPILATIONPOLICY_HPP 27 28 #include "code/nmethod.hpp" 29 #include "compiler/compileBroker.hpp" 30 #include "memory/allocation.hpp" 31 #include "runtime/vm_operations.hpp" 32 #include "utilities/growableArray.hpp" 33 34 // The CompilationPolicy selects which method (if any) should be compiled. 35 // It also decides which methods must always be compiled (i.e., are never 36 // interpreted). 37 class CompileTask; 38 class CompileQueue; 39 40 class CompilationPolicy : public CHeapObj { 41 static CompilationPolicy* _policy; 42 // Accumulated time 43 static elapsedTimer _accumulated_time; 44 45 static bool _in_vm_startup; 46 public: 47 static void set_in_vm_startup(bool in_vm_startup) { _in_vm_startup = in_vm_startup; } 48 static void completed_vm_startup(); 49 static bool delay_compilation_during_startup() { return _in_vm_startup; } 50 51 // m must be compiled before executing it 52 static bool must_be_compiled(methodHandle m, int comp_level = CompLevel_all); 53 // m is allowed to be compiled 54 static bool can_be_compiled(methodHandle m, int comp_level = CompLevel_all); 55 static bool is_compilation_enabled(); 56 static void set_policy(CompilationPolicy* policy) { _policy = policy; } 57 static CompilationPolicy* policy() { return _policy; } 58 59 // Profiling 60 elapsedTimer* accumulated_time() { return &_accumulated_time; } 61 void print_time() PRODUCT_RETURN; 62 virtual int compiler_count(CompLevel comp_level) = 0; 63 // main notification entry, return a pointer to an nmethod if the OSR is required, 64 // returns NULL otherwise. 65 virtual nmethod* event(methodHandle method, methodHandle inlinee, int branch_bci, int bci, CompLevel comp_level, TRAPS) = 0; 66 // safepoint() is called at the end of the safepoint 67 virtual void do_safepoint_work() = 0; 68 // reprofile request 69 virtual void reprofile(ScopeDesc* trap_scope, bool is_osr) = 0; 70 // delay_compilation(method) can be called by any component of the runtime to notify the policy 71 // that it's recommended to delay the complation of this method. 72 virtual void delay_compilation(methodOop method) = 0; 73 // disable_compilation() is called whenever the runtime decides to disable compilation of the 74 // specified method. 75 virtual void disable_compilation(methodOop method) = 0; 76 // Select task is called by CompileBroker. The queue is guaranteed to have at least one 77 // element and is locked. The function should select one and return it. 78 virtual CompileTask* select_task(CompileQueue* compile_queue) = 0; 79 // Tell the runtime if we think a given method is adequately profiled. 80 virtual bool is_mature(methodOop method) = 0; 81 // Do policy initialization 82 virtual void initialize() = 0; 83 }; 84 85 // A base class for baseline policies. 86 class NonTieredCompPolicy : public CompilationPolicy { 87 int _compiler_count; 88 protected: 89 static void trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci); 90 static void trace_osr_request(methodHandle method, nmethod* osr, int bci); 91 static void trace_osr_completion(nmethod* osr_nm); 92 void reset_counter_for_invocation_event(methodHandle method); 93 void reset_counter_for_back_branch_event(methodHandle method); 94 public: 95 NonTieredCompPolicy() : _compiler_count(0) { } 96 virtual int compiler_count(CompLevel comp_level); 97 virtual void do_safepoint_work(); 98 virtual void reprofile(ScopeDesc* trap_scope, bool is_osr); 99 virtual void delay_compilation(methodOop method); 100 virtual void disable_compilation(methodOop method); 101 virtual bool is_mature(methodOop method); 102 virtual void initialize(); 103 virtual CompileTask* select_task(CompileQueue* compile_queue); 104 virtual nmethod* event(methodHandle method, methodHandle inlinee, int branch_bci, int bci, CompLevel comp_level, TRAPS); 105 virtual void method_invocation_event(methodHandle m, TRAPS) = 0; 106 virtual void method_back_branch_event(methodHandle m, int bci, TRAPS) = 0; 107 }; 108 109 class SimpleCompPolicy : public NonTieredCompPolicy { 110 public: 111 virtual void method_invocation_event(methodHandle m, TRAPS); 112 virtual void method_back_branch_event(methodHandle m, int bci, TRAPS); 113 }; 114 115 // StackWalkCompPolicy - existing C2 policy 116 117 #ifdef COMPILER2 118 class StackWalkCompPolicy : public NonTieredCompPolicy { 119 public: 120 virtual void method_invocation_event(methodHandle m, TRAPS); 121 virtual void method_back_branch_event(methodHandle m, int bci, TRAPS); 122 123 private: 124 RFrame* findTopInlinableFrame(GrowableArray<RFrame*>* stack); 125 RFrame* senderOf(RFrame* rf, GrowableArray<RFrame*>* stack); 126 127 // the following variables hold values computed by the last inlining decision 128 // they are used for performance debugging only (print better messages) 129 static const char* _msg; // reason for not inlining 130 131 static const char* shouldInline (methodHandle callee, float frequency, int cnt); 132 // positive filter: should send be inlined? returns NULL (--> yes) or rejection msg 133 static const char* shouldNotInline(methodHandle callee); 134 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg 135 136 }; 137 #endif 138 139 #endif // SHARE_VM_RUNTIME_COMPILATIONPOLICY_HPP