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comparison src/share/vm/runtime/compilationPolicy.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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
29 class CompilationPolicy : public CHeapObj {
30 private:
31 static CompilationPolicy* _policy;
32 // Accumulated time
33 static elapsedTimer _accumulated_time;
34
35 static bool _in_vm_startup;
36
37 public:
38 virtual void method_invocation_event(methodHandle m, TRAPS) = 0;
39 virtual void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS) = 0;
40 virtual int compilation_level(methodHandle m, int branch_bci) = 0;
41
42 void reset_counter_for_invocation_event(methodHandle method);
43 void reset_counter_for_back_branch_event(methodHandle method);
44
45 static void set_in_vm_startup(bool in_vm_startup) { _in_vm_startup = in_vm_startup; }
46 static void completed_vm_startup();
47 static bool delayCompilationDuringStartup() { return _in_vm_startup; }
48
49 static bool mustBeCompiled(methodHandle m); // m must be compiled before executing it
50 static bool canBeCompiled(methodHandle m); // m is allowed to be compiled
51
52 static void set_policy(CompilationPolicy* policy) { _policy = policy; }
53 static CompilationPolicy* policy() { return _policy; }
54
55 // Profiling
56 elapsedTimer* accumulated_time() { return &_accumulated_time; }
57 void print_time() PRODUCT_RETURN;
58 };
59
60 class SimpleCompPolicy : public CompilationPolicy {
61 public:
62 void method_invocation_event( methodHandle m, TRAPS);
63 void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS);
64 int compilation_level(methodHandle m, int branch_bci);
65 };
66
67 // StackWalkCompPolicy - existing C2 policy
68
69 #ifdef COMPILER2
70 class StackWalkCompPolicy : public CompilationPolicy {
71 public:
72 void method_invocation_event(methodHandle m, TRAPS);
73 void method_back_branch_event(methodHandle m, int branch_bci, int loop_top_bci, TRAPS);
74 int compilation_level(methodHandle m, int branch_bci);
75
76 private:
77 RFrame* findTopInlinableFrame(GrowableArray<RFrame*>* stack);
78 RFrame* senderOf(RFrame* rf, GrowableArray<RFrame*>* stack);
79
80 // the following variables hold values computed by the last inlining decision
81 // they are used for performance debugging only (print better messages)
82 static const char* _msg; // reason for not inlining
83
84 static const char* shouldInline (methodHandle callee, float frequency, int cnt);
85 // positive filter: should send be inlined? returns NULL (--> yes) or rejection msg
86 static const char* shouldNotInline(methodHandle callee);
87 // negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg
88
89 };
90 #endif