Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2001, 2010, 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.

  *

  */

 class CompileTask;

 class CompileQueue;

 class SimpleThresholdPolicy : public CompilationPolicy {

   int _c1_count, _c2_count;

   // Check if the counter is big enough and set carry (effectively infinity).

   inline void set_carry_if_necessary(InvocationCounter *counter);

   // Set carry flags in the counters (in methodOop and MDO).

   inline void handle_counter_overflow(methodOop method);

   // Call and loop predicates determine whether a transition to a higher compilation

   // level should be performed (pointers to predicate functions are passed to common_TF().

   // Predicates also take compiler load into account.

   typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level);

   bool call_predicate(int i, int b, CompLevel cur_level);

   bool loop_predicate(int i, int b, CompLevel cur_level);

   // Common transition function. Given a predicate determines if a method should transition to another level.

   CompLevel common(Predicate p, methodOop method, CompLevel cur_level);

   // Transition functions.

   // call_event determines if a method should be compiled at a different

   // level with a regular invocation entry.

   CompLevel call_event(methodOop method, CompLevel cur_level);

   // loop_event checks if a method should be OSR compiled at a different

   // level.

   CompLevel loop_event(methodOop method, CompLevel cur_level);

 protected:

   int c1_count() const     { return _c1_count; }

   int c2_count() const     { return _c2_count; }

   void set_c1_count(int x) { _c1_count = x;    }

   void set_c2_count(int x) { _c2_count = x;    }

   enum EventType { CALL, LOOP, COMPILE };

   void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level);

   // Print policy-specific information if necessary

   virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { }

   // Check if the method can be compiled, change level if necessary

   void compile(methodHandle mh, int bci, CompLevel level, TRAPS);

   // Submit a given method for compilation

   virtual void submit_compile(methodHandle mh, int bci, CompLevel level, TRAPS);

   // Simple methods are as good being compiled with C1 as C2.

   // This function tells if it's such a function.

   inline bool is_trivial(methodOop method);

   // Predicate helpers are used by .*_predicate() methods as well as others.

   // They check the given counter values, multiplied by the scale against the thresholds.

   template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale);

   template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale);

   // Get a compilation level for a given method.

   static CompLevel comp_level(methodOop method) {

     nmethod *nm = method->code();

     if (nm != NULL && nm->is_in_use()) {

       return (CompLevel)nm->comp_level();

     }

     return CompLevel_none;

   }

   virtual void method_invocation_event(methodHandle method, methodHandle inlinee,

                                        CompLevel level, TRAPS);

   virtual void method_back_branch_event(methodHandle method, methodHandle inlinee,

                                         int bci, CompLevel level, TRAPS);

 public:

   SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }

   virtual int compiler_count(CompLevel comp_level) {

     if (is_c1_compile(comp_level)) return c1_count();

     if (is_c2_compile(comp_level)) return c2_count();

     return 0;

   }

   virtual void do_safepoint_work() { }

   virtual void delay_compilation(methodOop method) { }

   virtual void disable_compilation(methodOop method) { }

   // TODO: we should honour reprofiling requests in the future. Currently reprofiling

   // would happen but not to the extent we would ideally like.

   virtual void reprofile(ScopeDesc* trap_scope, bool is_osr) { }

   virtual nmethod* event(methodHandle method, methodHandle inlinee,

                          int branch_bci, int bci, CompLevel comp_level, TRAPS);

   // Select task is called by CompileBroker. We should return a task or NULL.

   virtual CompileTask* select_task(CompileQueue* compile_queue);

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

   virtual bool is_mature(methodOop method);

   // Initialize: set compiler thread count

   virtual void initialize();

 };