jdk8-mips64-public/hotspot: src/share/vm/runtime/compilationPolicy.hpp@2a47bd84841f

     1 /*

     2  * Copyright (c) 2000, 2006, 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

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    22  *

    23  */

    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).

    29 class CompilationPolicy : public CHeapObj {

    30  private:

    31   static CompilationPolicy* _policy;

    32   // Accumulated time

    33   static elapsedTimer       _accumulated_time;

    35   static bool               _in_vm_startup;

    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;

    42   void reset_counter_for_invocation_event(methodHandle method);

    43   void reset_counter_for_back_branch_event(methodHandle method);

    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; }

    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

    52   static void set_policy(CompilationPolicy* policy) { _policy = policy; }

    53   static CompilationPolicy* policy() { return _policy; }

    55   // Profiling

    56   elapsedTimer* accumulated_time() { return &_accumulated_time; }

    57   void print_time() PRODUCT_RETURN;

    58 };

    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 };

    67 // StackWalkCompPolicy - existing C2 policy

    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);

    76  private:

    77   RFrame* findTopInlinableFrame(GrowableArray<RFrame*>* stack);

    78   RFrame* senderOf(RFrame* rf, GrowableArray<RFrame*>* stack);

    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

    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

    89 };

    90 #endif

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