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 /*

  * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 #ifndef SHARE_VM_RUNTIME_COMPILATIONPOLICY_HPP

 #define SHARE_VM_RUNTIME_COMPILATIONPOLICY_HPP

 #include "code/nmethod.hpp"

 #include "compiler/compileBroker.hpp"

 #include "memory/allocation.hpp"

 #include "runtime/vm_operations.hpp"

 #include "utilities/growableArray.hpp"

 // The CompilationPolicy selects which method (if any) should be compiled.

 // It also decides which methods must always be compiled (i.e., are never

 // interpreted).

 class CompileTask;

 class CompileQueue;

 class CompilationPolicy : public CHeapObj<mtCompiler> {

   static CompilationPolicy* _policy;

   // Accumulated time

   static elapsedTimer       _accumulated_time;

   static bool               _in_vm_startup;

 public:

   static  void set_in_vm_startup(bool in_vm_startup) { _in_vm_startup = in_vm_startup; }

   static  void completed_vm_startup();

   static  bool delay_compilation_during_startup()    { return _in_vm_startup; }

   // m must be compiled before executing it

   static bool must_be_compiled(methodHandle m, int comp_level = CompLevel_all);

   // m is allowed to be compiled

   static bool can_be_compiled(methodHandle m, int comp_level = CompLevel_all);

   static bool is_compilation_enabled();

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

   static CompilationPolicy* policy()                { return _policy; }

   // Profiling

   elapsedTimer* accumulated_time() { return &_accumulated_time; }

   void print_time() PRODUCT_RETURN;

   // Return initial compile level that is used with Xcomp

   virtual CompLevel initial_compile_level() = 0;

   virtual int compiler_count(CompLevel comp_level) = 0;

   // main notification entry, return a pointer to an nmethod if the OSR is required,

   // returns NULL otherwise.

   virtual nmethod* event(methodHandle method, methodHandle inlinee, int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) = 0;

   // safepoint() is called at the end of the safepoint

   virtual void do_safepoint_work() = 0;

   // reprofile request

   virtual void reprofile(ScopeDesc* trap_scope, bool is_osr) = 0;

   // delay_compilation(method) can be called by any component of the runtime to notify the policy

   // that it's recommended to delay the complation of this method.

   virtual void delay_compilation(Method* method) = 0;

   // disable_compilation() is called whenever the runtime decides to disable compilation of the

   // specified method.

   virtual void disable_compilation(Method* method) = 0;

   // Select task is called by CompileBroker. The queue is guaranteed to have at least one

   // element and is locked. The function should select one and return it.

   virtual CompileTask* select_task(CompileQueue* compile_queue) = 0;

   // Tell the runtime if we think a given method is adequately profiled.

   virtual bool is_mature(Method* method) = 0;

   // Do policy initialization

   virtual void initialize() = 0;

   virtual bool should_not_inline(ciEnv* env, ciMethod* method) { return false; }

 };

 // A base class for baseline policies.

 class NonTieredCompPolicy : public CompilationPolicy {

   int _compiler_count;

 protected:

   static void trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci);

   static void trace_osr_request(methodHandle method, nmethod* osr, int bci);

   static void trace_osr_completion(nmethod* osr_nm);

   void reset_counter_for_invocation_event(methodHandle method);

   void reset_counter_for_back_branch_event(methodHandle method);

 public:

   NonTieredCompPolicy() : _compiler_count(0) { }

   virtual CompLevel initial_compile_level() { return CompLevel_initial_compile; }

   virtual int compiler_count(CompLevel comp_level);

   virtual void do_safepoint_work();

   virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);

   virtual void delay_compilation(Method* method);

   virtual void disable_compilation(Method* method);

   virtual bool is_mature(Method* method);

   virtual void initialize();

   virtual CompileTask* select_task(CompileQueue* compile_queue);

   virtual nmethod* event(methodHandle method, methodHandle inlinee, int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread);

   virtual void method_invocation_event(methodHandle m, JavaThread* thread) = 0;

   virtual void method_back_branch_event(methodHandle m, int bci, JavaThread* thread) = 0;

 };

 class SimpleCompPolicy : public NonTieredCompPolicy {

  public:

   virtual void method_invocation_event(methodHandle m, JavaThread* thread);

   virtual void method_back_branch_event(methodHandle m, int bci, JavaThread* thread);

 };

 // StackWalkCompPolicy - existing C2 policy

 #ifdef COMPILER2

 class StackWalkCompPolicy : public NonTieredCompPolicy {

  public:

   virtual void method_invocation_event(methodHandle m, JavaThread* thread);

   virtual void method_back_branch_event(methodHandle m, int bci, JavaThread* thread);

  private:

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

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

   // the following variables hold values computed by the last inlining decision

   // they are used for performance debugging only (print better messages)

   static const char* _msg;            // reason for not inlining

   static const char* shouldInline   (methodHandle callee, float frequency, int cnt);

   // positive filter: should send be inlined?  returns NULL (--> yes) or rejection msg

   static const char* shouldNotInline(methodHandle callee);

   // negative filter: should send NOT be inlined?  returns NULL (--> inline) or rejection msg

 };

 #endif

 #endif // SHARE_VM_RUNTIME_COMPILATIONPOLICY_HPP