6953144: Tiered compilation

Infrastructure for tiered compilation support (interpreter + c1 + c2) for 32 and 64 bit. Simple tiered policy implementation.

Reviewed-by: kvn, never, phh, twisti

hotspot/src/share/vm/runtime/simpleThresholdPolicy.hpp

@@ -0,0 +1,107 @@
+/*
+ * 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();
+};