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