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#ifdef TIERED
34
35class CompileTask;
36class CompileQueue;
37
38class SimpleThresholdPolicy : public CompilationPolicy {
39  int _c1_count, _c2_count;
40
41  // Check if the counter is big enough and set carry (effectively infinity).
42  inline void set_carry_if_necessary(InvocationCounter *counter);
43  // Set carry flags in the counters (in Method* and MDO).
44  inline void handle_counter_overflow(Method* method);
45  // Call and loop predicates determine whether a transition to a higher compilation
46  // level should be performed (pointers to predicate functions are passed to common_TF().
47  // Predicates also take compiler load into account.
48  typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level, Method* method);
49  bool call_predicate(int i, int b, CompLevel cur_level, Method* method);
50  bool loop_predicate(int i, int b, CompLevel cur_level, Method* method);
51  // Common transition function. Given a predicate determines if a method should transition to another level.
52  CompLevel common(Predicate p, Method* method, CompLevel cur_level);
53  // Transition functions.
54  // call_event determines if a method should be compiled at a different
55  // level with a regular invocation entry.
56  CompLevel call_event(Method* method, CompLevel cur_level, JavaThread* thread);
57  // loop_event checks if a method should be OSR compiled at a different
58  // level.
59  CompLevel loop_event(Method* method, CompLevel cur_level, JavaThread* thread);
60  void print_counters(const char* prefix, methodHandle mh);
61protected:
62  int c1_count() const     { return _c1_count; }
63  int c2_count() const     { return _c2_count; }
64  void set_c1_count(int x) { _c1_count = x;    }
65  void set_c2_count(int x) { _c2_count = x;    }
66
67  enum EventType { CALL, LOOP, COMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };
68  void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level);
69  // Print policy-specific information if necessary
70  virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { }
71  // Check if the method can be compiled, change level if necessary
72  void compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread);
73  // Submit a given method for compilation
74  virtual void submit_compile(const methodHandle& mh, int bci, CompLevel level, JavaThread* thread);
75  // Simple methods are as good being compiled with C1 as C2.
76  // This function tells if it's such a function.
77  inline bool is_trivial(Method* method);
78
79  // Predicate helpers are used by .*_predicate() methods as well as others.
80  // They check the given counter values, multiplied by the scale against the thresholds.
81  template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale, Method* method);
82  template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale, Method* method);
83
84  // Get a compilation level for a given method.
85  static CompLevel comp_level(Method* method) {
86    CompiledMethod *nm = method->code();
87    if (nm != NULL && nm->is_in_use()) {
88      return (CompLevel)nm->comp_level();
89    }
90    return CompLevel_none;
91  }
92  virtual void method_invocation_event(const methodHandle& method, const methodHandle& inlinee,
93                                       CompLevel level, CompiledMethod* nm, JavaThread* thread);
94  virtual void method_back_branch_event(const methodHandle& method, const methodHandle& inlinee,
95                                        int bci, CompLevel level, CompiledMethod* nm, JavaThread* thread);
96public:
97  SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }
98  virtual int compiler_count(CompLevel comp_level) {
99    if (is_c1_compile(comp_level)) return c1_count();
100    if (is_c2_compile(comp_level)) return c2_count();
101    return 0;
102  }
103  virtual CompLevel initial_compile_level() { return MIN2((CompLevel)TieredStopAtLevel, CompLevel_initial_compile); }
104  virtual void do_safepoint_work() { }
105  virtual void delay_compilation(Method* method) { }
106  virtual void disable_compilation(Method* method) { }
107  virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);
108  virtual nmethod* event(const methodHandle& method, const methodHandle& inlinee,
109                         int branch_bci, int bci, CompLevel comp_level, CompiledMethod* nm, JavaThread* thread);
110  // Select task is called by CompileBroker. We should return a task or NULL.
111  virtual CompileTask* select_task(CompileQueue* compile_queue);
112  // Tell the runtime if we think a given method is adequately profiled.
113  virtual bool is_mature(Method* method);
114  // Initialize: set compiler thread count
115  virtual void initialize();
116  virtual bool should_not_inline(ciEnv* env, ciMethod* callee) {
117    return (env->comp_level() == CompLevel_limited_profile ||
118            env->comp_level() == CompLevel_full_profile) &&
119            callee->has_loops();
120  }
121};
122
123#endif // TIERED
124
125#endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
126