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