hotspot/src/share/vm/runtime/simpleThresholdPolicy.hpp
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7154333: JVM fails to start if -XX:+AggressiveHeap is set Summary: Don't set CompilationPolicyChoice with AggressiveHeap Reviewed-by: never
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/*
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 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
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#define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
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#include "code/nmethod.hpp"
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#include "oops/methodDataOop.hpp"
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#include "runtime/compilationPolicy.hpp"
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#include "utilities/globalDefinitions.hpp"
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class CompileTask;
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class CompileQueue;
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class SimpleThresholdPolicy : public CompilationPolicy {
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  int _c1_count, _c2_count;
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  // Check if the counter is big enough and set carry (effectively infinity).
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  inline void set_carry_if_necessary(InvocationCounter *counter);
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  // Set carry flags in the counters (in methodOop and MDO).
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  inline void handle_counter_overflow(methodOop method);
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  // Call and loop predicates determine whether a transition to a higher compilation
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  // level should be performed (pointers to predicate functions are passed to common_TF().
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  // Predicates also take compiler load into account.
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  typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level);
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  bool call_predicate(int i, int b, CompLevel cur_level);
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  bool loop_predicate(int i, int b, CompLevel cur_level);
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  // Common transition function. Given a predicate determines if a method should transition to another level.
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  CompLevel common(Predicate p, methodOop method, CompLevel cur_level);
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  // Transition functions.
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  // call_event determines if a method should be compiled at a different
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  // level with a regular invocation entry.
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  CompLevel call_event(methodOop method, CompLevel cur_level);
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  // loop_event checks if a method should be OSR compiled at a different
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  // level.
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  CompLevel loop_event(methodOop method, CompLevel cur_level);
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  void print_counters(const char* prefix, methodHandle mh);
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protected:
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  int c1_count() const     { return _c1_count; }
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  int c2_count() const     { return _c2_count; }
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  void set_c1_count(int x) { _c1_count = x;    }
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  void set_c2_count(int x) { _c2_count = x;    }
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  enum EventType { CALL, LOOP, COMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };
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  void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level);
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  // Print policy-specific information if necessary
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  virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { }
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  // Check if the method can be compiled, change level if necessary
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  void compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread);
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  // Submit a given method for compilation
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  virtual void submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread);
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  // Simple methods are as good being compiled with C1 as C2.
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  // This function tells if it's such a function.
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  inline bool is_trivial(methodOop method);
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  // Predicate helpers are used by .*_predicate() methods as well as others.
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  // They check the given counter values, multiplied by the scale against the thresholds.
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  template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale);
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  template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale);
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  // Get a compilation level for a given method.
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  static CompLevel comp_level(methodOop method) {
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    nmethod *nm = method->code();
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    if (nm != NULL && nm->is_in_use()) {
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      return (CompLevel)nm->comp_level();
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    }
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    return CompLevel_none;
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  }
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  virtual void method_invocation_event(methodHandle method, methodHandle inlinee,
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                                       CompLevel level, nmethod* nm, JavaThread* thread);
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  virtual void method_back_branch_event(methodHandle method, methodHandle inlinee,
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                                        int bci, CompLevel level, nmethod* nm, JavaThread* thread);
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public:
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  SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }
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  virtual int compiler_count(CompLevel comp_level) {
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    if (is_c1_compile(comp_level)) return c1_count();
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    if (is_c2_compile(comp_level)) return c2_count();
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    return 0;
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  }
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  virtual CompLevel initial_compile_level() { return MIN2((CompLevel)TieredStopAtLevel, CompLevel_initial_compile); }
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  virtual void do_safepoint_work() { }
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  virtual void delay_compilation(methodOop method) { }
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  virtual void disable_compilation(methodOop method) { }
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  virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);
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  virtual nmethod* event(methodHandle method, methodHandle inlinee,
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                         int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread);
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  // Select task is called by CompileBroker. We should return a task or NULL.
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  virtual CompileTask* select_task(CompileQueue* compile_queue);
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  // Tell the runtime if we think a given method is adequately profiled.
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  virtual bool is_mature(methodOop method);
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  // Initialize: set compiler thread count
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  virtual void initialize();
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  virtual bool should_not_inline(ciEnv* env, ciMethod* callee) {
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    return (env->comp_level() == CompLevel_limited_profile ||
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            env->comp_level() == CompLevel_full_profile) &&
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            callee->has_loops();
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  }
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};
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#endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP