--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/simpleThresholdPolicy.hpp Fri Sep 03 17:51:07 2010 -0700
@@ -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();
+};