--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/compiler/compilationPolicy.hpp	Wed Oct 09 12:43:32 2019 -0700
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2000, 2019, 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.
+ *
+ */
+
+#ifndef SHARE_COMPILER_COMPILATIONPOLICY_HPP
+#define SHARE_COMPILER_COMPILATIONPOLICY_HPP
+
+#include "code/nmethod.hpp"
+#include "compiler/compileBroker.hpp"
+#include "memory/allocation.hpp"
+#include "runtime/vmOperations.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;
+
+  // m must be compiled before executing it
+  static bool must_be_compiled(const methodHandle& m, int comp_level = CompLevel_all);
+
+public:
+  // If m must_be_compiled then request a compilation from the CompileBroker.
+  // This supports the -Xcomp option.
+  static void compile_if_required(const methodHandle& m, TRAPS);
+
+  // m is allowed to be compiled
+  static bool can_be_compiled(const methodHandle& m, int comp_level = CompLevel_all);
+  // m is allowed to be osr compiled
+  static bool can_be_osr_compiled(const 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; }
+
+  static CompileTask* select_task_helper(CompileQueue* compile_queue);
+
+  // 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(const methodHandle& method, const methodHandle& inlinee, int branch_bci, int bci, CompLevel comp_level, CompiledMethod* 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 compilation 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 simple compilation policy.
+class SimpleCompPolicy : public CompilationPolicy {
+  int _compiler_count;
+ private:
+  static void trace_frequency_counter_overflow(const methodHandle& m, int branch_bci, int bci);
+  static void trace_osr_request(const methodHandle& method, nmethod* osr, int bci);
+  static void trace_osr_completion(nmethod* osr_nm);
+  void reset_counter_for_invocation_event(const methodHandle& method);
+  void reset_counter_for_back_branch_event(const methodHandle& method);
+  void method_invocation_event(const methodHandle& m, JavaThread* thread);
+  void method_back_branch_event(const methodHandle& m, int bci, JavaThread* thread);
+ public:
+  SimpleCompPolicy() : _compiler_count(0) { }
+  virtual CompLevel initial_compile_level() { return CompLevel_highest_tier; }
+  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(const methodHandle& method, const methodHandle& inlinee, int branch_bci, int bci, CompLevel comp_level, CompiledMethod* nm, JavaThread* thread);
+};
+
+
+#endif // SHARE_COMPILER_COMPILATIONPOLICY_HPP