--- old/src/share/vm/runtime/simpleThresholdPolicy.hpp
          +++ new/src/share/vm/runtime/simpleThresholdPolicy.hpp

   1    1  /*
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   3    3   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4    4   *
   5    5   * This code is free software; you can redistribute it and/or modify it
   6    6   * under the terms of the GNU General Public License version 2 only, as
   7    7   * published by the Free Software Foundation.
   8    8   *
   9    9   * This code is distributed in the hope that it will be useful, but WITHOUT
  10   10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11   11   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12   12   * version 2 for more details (a copy is included in the LICENSE file that
  13   13   * accompanied this code).
  14   14   *
  15   15   * You should have received a copy of the GNU General Public License version
  16   16   * 2 along with this work; if not, write to the Free Software Foundation,
  17   17   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18   18   *
  19   19   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20   20   * or visit www.oracle.com if you need additional information or have any
  21   21   * questions.
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  23   23   */
  24   24  
  25   25  #ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
  26   26  #define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
  27   27  
  28   28  #include "code/nmethod.hpp"
  29   29  #include "oops/methodDataOop.hpp"
  30   30  #include "runtime/compilationPolicy.hpp"
  31   31  #include "utilities/globalDefinitions.hpp"
  32   32  
  33   33  class CompileTask;
  34   34  class CompileQueue;
  35   35  
  36   36  class SimpleThresholdPolicy : public CompilationPolicy {
  37   37    int _c1_count, _c2_count;
  38   38  
  39   39    // Check if the counter is big enough and set carry (effectively infinity).
  40   40    inline void set_carry_if_necessary(InvocationCounter *counter);
  41   41    // Set carry flags in the counters (in methodOop and MDO).
  42   42    inline void handle_counter_overflow(methodOop method);
  43   43    // Call and loop predicates determine whether a transition to a higher compilation
  44   44    // level should be performed (pointers to predicate functions are passed to common_TF().
  45   45    // Predicates also take compiler load into account.
  46   46    typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level);
  47   47    bool call_predicate(int i, int b, CompLevel cur_level);
  48   48    bool loop_predicate(int i, int b, CompLevel cur_level);
  49   49    // Common transition function. Given a predicate determines if a method should transition to another level.
  50   50    CompLevel common(Predicate p, methodOop method, CompLevel cur_level);
  51   51    // Transition functions.
  52   52    // call_event determines if a method should be compiled at a different
  53   53    // level with a regular invocation entry.
  54   54    CompLevel call_event(methodOop method, CompLevel cur_level);
  55   55    // loop_event checks if a method should be OSR compiled at a different
  56   56    // level.
  57   57    CompLevel loop_event(methodOop method, CompLevel cur_level);
  58   58  
  59   59  protected:
  60   60    int c1_count() const     { return _c1_count; }
  61   61    int c2_count() const     { return _c2_count; }
  62   62    void set_c1_count(int x) { _c1_count = x;    }
  63   63    void set_c2_count(int x) { _c2_count = x;    }
  64   64  
  65   65    enum EventType { CALL, LOOP, COMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };
  66   66    void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level);
  67   67    // Print policy-specific information if necessary
  68   68    virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { }
  69   69    // Check if the method can be compiled, change level if necessary
  70   70    void compile(methodHandle mh, int bci, CompLevel level, TRAPS);
  71   71    // Submit a given method for compilation
  72   72    virtual void submit_compile(methodHandle mh, int bci, CompLevel level, TRAPS);
  73   73    // Simple methods are as good being compiled with C1 as C2.
  74   74    // This function tells if it's such a function.
  75   75    inline bool is_trivial(methodOop method);
  76   76  
  77   77    // Predicate helpers are used by .*_predicate() methods as well as others.
  78   78    // They check the given counter values, multiplied by the scale against the thresholds.
  79   79    template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale);
  80   80    template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale);
  81   81  
  82   82    // Get a compilation level for a given method.
  83   83    static CompLevel comp_level(methodOop method) {
  84   84      nmethod *nm = method->code();
  85   85      if (nm != NULL && nm->is_in_use()) {
  86   86        return (CompLevel)nm->comp_level();
  87   87      }
  88   88      return CompLevel_none;
  89   89    }
  90   90    virtual void method_invocation_event(methodHandle method, methodHandle inlinee,

  91   91                                         CompLevel level, nmethod* nm, TRAPS);
  92   92    virtual void method_back_branch_event(methodHandle method, methodHandle inlinee,
  93   93                                          int bci, CompLevel level, nmethod* nm, TRAPS);
  94   94  public:
  95   95    SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }
  96   96    virtual int compiler_count(CompLevel comp_level) {
  97   97      if (is_c1_compile(comp_level)) return c1_count();
  98   98      if (is_c2_compile(comp_level)) return c2_count();
  99   99      return 0;
 100  100    }
      101 +  virtual CompLevel initial_compile_level() { return MIN2((CompLevel)TieredStopAtLevel, CompLevel_initial_compile); }
 101  102    virtual void do_safepoint_work() { }
 102  103    virtual void delay_compilation(methodOop method) { }
 103  104    virtual void disable_compilation(methodOop method) { }
 104  105    virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);
 105  106    virtual nmethod* event(methodHandle method, methodHandle inlinee,
 106  107                           int branch_bci, int bci, CompLevel comp_level, nmethod* nm, TRAPS);
 107  108    // Select task is called by CompileBroker. We should return a task or NULL.
 108  109    virtual CompileTask* select_task(CompileQueue* compile_queue);
 109  110    // Tell the runtime if we think a given method is adequately profiled.
 110  111    virtual bool is_mature(methodOop method);
 111  112    // Initialize: set compiler thread count
 112  113    virtual void initialize();
 113  114    virtual bool should_not_inline(ciEnv* env, ciMethod* callee) {
 114  115      return (env->comp_level() == CompLevel_limited_profile ||
 115  116              env->comp_level() == CompLevel_full_profile) &&
 116  117              callee->has_loops();
 117  118    }
 118  119  };
 119  120  
 120  121  #endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
    

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