1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/simpleThresholdPolicy.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,121 @@
1.4 +/*
1.5 + * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
1.29 +#define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
1.30 +
1.31 +#include "code/nmethod.hpp"
1.32 +#include "oops/methodData.hpp"
1.33 +#include "runtime/compilationPolicy.hpp"
1.34 +#include "utilities/globalDefinitions.hpp"
1.35 +
1.36 +class CompileTask;
1.37 +class CompileQueue;
1.38 +
1.39 +class SimpleThresholdPolicy : public CompilationPolicy {
1.40 + int _c1_count, _c2_count;
1.41 +
1.42 + // Check if the counter is big enough and set carry (effectively infinity).
1.43 + inline void set_carry_if_necessary(InvocationCounter *counter);
1.44 + // Set carry flags in the counters (in Method* and MDO).
1.45 + inline void handle_counter_overflow(Method* method);
1.46 + // Call and loop predicates determine whether a transition to a higher compilation
1.47 + // level should be performed (pointers to predicate functions are passed to common_TF().
1.48 + // Predicates also take compiler load into account.
1.49 + typedef bool (SimpleThresholdPolicy::*Predicate)(int i, int b, CompLevel cur_level);
1.50 + bool call_predicate(int i, int b, CompLevel cur_level);
1.51 + bool loop_predicate(int i, int b, CompLevel cur_level);
1.52 + // Common transition function. Given a predicate determines if a method should transition to another level.
1.53 + CompLevel common(Predicate p, Method* method, CompLevel cur_level);
1.54 + // Transition functions.
1.55 + // call_event determines if a method should be compiled at a different
1.56 + // level with a regular invocation entry.
1.57 + CompLevel call_event(Method* method, CompLevel cur_level);
1.58 + // loop_event checks if a method should be OSR compiled at a different
1.59 + // level.
1.60 + CompLevel loop_event(Method* method, CompLevel cur_level);
1.61 + void print_counters(const char* prefix, methodHandle mh);
1.62 +protected:
1.63 + int c1_count() const { return _c1_count; }
1.64 + int c2_count() const { return _c2_count; }
1.65 + void set_c1_count(int x) { _c1_count = x; }
1.66 + void set_c2_count(int x) { _c2_count = x; }
1.67 +
1.68 + enum EventType { CALL, LOOP, COMPILE, REMOVE_FROM_QUEUE, UPDATE_IN_QUEUE, REPROFILE, MAKE_NOT_ENTRANT };
1.69 + void print_event(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level);
1.70 + // Print policy-specific information if necessary
1.71 + virtual void print_specific(EventType type, methodHandle mh, methodHandle imh, int bci, CompLevel level) { }
1.72 + // Check if the method can be compiled, change level if necessary
1.73 + void compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread);
1.74 + // Submit a given method for compilation
1.75 + virtual void submit_compile(methodHandle mh, int bci, CompLevel level, JavaThread* thread);
1.76 + // Simple methods are as good being compiled with C1 as C2.
1.77 + // This function tells if it's such a function.
1.78 + inline bool is_trivial(Method* method);
1.79 +
1.80 + // Predicate helpers are used by .*_predicate() methods as well as others.
1.81 + // They check the given counter values, multiplied by the scale against the thresholds.
1.82 + template<CompLevel level> static inline bool call_predicate_helper(int i, int b, double scale);
1.83 + template<CompLevel level> static inline bool loop_predicate_helper(int i, int b, double scale);
1.84 +
1.85 + // Get a compilation level for a given method.
1.86 + static CompLevel comp_level(Method* method) {
1.87 + nmethod *nm = method->code();
1.88 + if (nm != NULL && nm->is_in_use()) {
1.89 + return (CompLevel)nm->comp_level();
1.90 + }
1.91 + return CompLevel_none;
1.92 + }
1.93 + virtual void method_invocation_event(methodHandle method, methodHandle inlinee,
1.94 + CompLevel level, nmethod* nm, JavaThread* thread);
1.95 + virtual void method_back_branch_event(methodHandle method, methodHandle inlinee,
1.96 + int bci, CompLevel level, nmethod* nm, JavaThread* thread);
1.97 +public:
1.98 + SimpleThresholdPolicy() : _c1_count(0), _c2_count(0) { }
1.99 + virtual int compiler_count(CompLevel comp_level) {
1.100 + if (is_c1_compile(comp_level)) return c1_count();
1.101 + if (is_c2_compile(comp_level)) return c2_count();
1.102 + return 0;
1.103 + }
1.104 + virtual CompLevel initial_compile_level() { return MIN2((CompLevel)TieredStopAtLevel, CompLevel_initial_compile); }
1.105 + virtual void do_safepoint_work() { }
1.106 + virtual void delay_compilation(Method* method) { }
1.107 + virtual void disable_compilation(Method* method) { }
1.108 + virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);
1.109 + virtual nmethod* event(methodHandle method, methodHandle inlinee,
1.110 + int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread);
1.111 + // Select task is called by CompileBroker. We should return a task or NULL.
1.112 + virtual CompileTask* select_task(CompileQueue* compile_queue);
1.113 + // Tell the runtime if we think a given method is adequately profiled.
1.114 + virtual bool is_mature(Method* method);
1.115 + // Initialize: set compiler thread count
1.116 + virtual void initialize();
1.117 + virtual bool should_not_inline(ciEnv* env, ciMethod* callee) {
1.118 + return (env->comp_level() == CompLevel_limited_profile ||
1.119 + env->comp_level() == CompLevel_full_profile) &&
1.120 + callee->has_loops();
1.121 + }
1.122 +};
1.123 +
1.124 +#endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_HPP
