148 lines
6.7 KiB
C++
148 lines
6.7 KiB
C++
/*
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* Copyright (c) 2000, 2015, 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_COMPILATIONPOLICY_HPP
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#define SHARE_VM_RUNTIME_COMPILATIONPOLICY_HPP
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#include "code/nmethod.hpp"
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#include "compiler/compileBroker.hpp"
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#include "memory/allocation.hpp"
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#include "runtime/vm_operations.hpp"
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#include "utilities/growableArray.hpp"
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// The CompilationPolicy selects which method (if any) should be compiled.
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// It also decides which methods must always be compiled (i.e., are never
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// interpreted).
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class CompileTask;
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class CompileQueue;
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class CompilationPolicy : public CHeapObj<mtCompiler> {
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static CompilationPolicy* _policy;
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// Accumulated time
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static elapsedTimer _accumulated_time;
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static bool _in_vm_startup;
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public:
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static void set_in_vm_startup(bool in_vm_startup) { _in_vm_startup = in_vm_startup; }
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static void completed_vm_startup();
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static bool delay_compilation_during_startup() { return _in_vm_startup; }
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// m must be compiled before executing it
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static bool must_be_compiled(methodHandle m, int comp_level = CompLevel_all);
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// m is allowed to be compiled
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static bool can_be_compiled(methodHandle m, int comp_level = CompLevel_all);
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// m is allowed to be osr compiled
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static bool can_be_osr_compiled(methodHandle m, int comp_level = CompLevel_all);
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static bool is_compilation_enabled();
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static void set_policy(CompilationPolicy* policy) { _policy = policy; }
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static CompilationPolicy* policy() { return _policy; }
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static CompileTask* select_task_helper(CompileQueue* compile_queue);
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// Profiling
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elapsedTimer* accumulated_time() { return &_accumulated_time; }
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void print_time() PRODUCT_RETURN;
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// Return initial compile level that is used with Xcomp
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virtual CompLevel initial_compile_level() = 0;
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virtual int compiler_count(CompLevel comp_level) = 0;
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// main notification entry, return a pointer to an nmethod if the OSR is required,
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// returns NULL otherwise.
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virtual nmethod* event(const methodHandle& method, const methodHandle& inlinee, int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread) = 0;
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// safepoint() is called at the end of the safepoint
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virtual void do_safepoint_work() = 0;
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// reprofile request
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virtual void reprofile(ScopeDesc* trap_scope, bool is_osr) = 0;
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// delay_compilation(method) can be called by any component of the runtime to notify the policy
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// that it's recommended to delay the compilation of this method.
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virtual void delay_compilation(Method* method) = 0;
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// disable_compilation() is called whenever the runtime decides to disable compilation of the
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// specified method.
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virtual void disable_compilation(Method* method) = 0;
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// Select task is called by CompileBroker. The queue is guaranteed to have at least one
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// element and is locked. The function should select one and return it.
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virtual CompileTask* select_task(CompileQueue* compile_queue) = 0;
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// Tell the runtime if we think a given method is adequately profiled.
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virtual bool is_mature(Method* method) = 0;
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// Do policy initialization
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virtual void initialize() = 0;
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virtual bool should_not_inline(ciEnv* env, ciMethod* method) { return false; }
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};
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// A base class for baseline policies.
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class NonTieredCompPolicy : public CompilationPolicy {
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int _compiler_count;
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protected:
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static void trace_frequency_counter_overflow(const methodHandle& m, int branch_bci, int bci);
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static void trace_osr_request(const methodHandle& method, nmethod* osr, int bci);
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static void trace_osr_completion(nmethod* osr_nm);
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void reset_counter_for_invocation_event(const methodHandle& method);
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void reset_counter_for_back_branch_event(const methodHandle& method);
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public:
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NonTieredCompPolicy() : _compiler_count(0) { }
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virtual CompLevel initial_compile_level() { return CompLevel_highest_tier; }
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virtual int compiler_count(CompLevel comp_level);
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virtual void do_safepoint_work();
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virtual void reprofile(ScopeDesc* trap_scope, bool is_osr);
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virtual void delay_compilation(Method* method);
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virtual void disable_compilation(Method* method);
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virtual bool is_mature(Method* method);
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virtual void initialize();
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virtual CompileTask* select_task(CompileQueue* compile_queue);
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virtual nmethod* event(const methodHandle& method, const methodHandle& inlinee, int branch_bci, int bci, CompLevel comp_level, nmethod* nm, JavaThread* thread);
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virtual void method_invocation_event(const methodHandle& m, JavaThread* thread) = 0;
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virtual void method_back_branch_event(const methodHandle& m, int bci, JavaThread* thread) = 0;
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};
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class SimpleCompPolicy : public NonTieredCompPolicy {
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public:
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virtual void method_invocation_event(const methodHandle& m, JavaThread* thread);
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virtual void method_back_branch_event(const methodHandle& m, int bci, JavaThread* thread);
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};
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// StackWalkCompPolicy - existing C2 policy
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#ifdef COMPILER2
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class StackWalkCompPolicy : public NonTieredCompPolicy {
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public:
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virtual void method_invocation_event(const methodHandle& m, JavaThread* thread);
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virtual void method_back_branch_event(const methodHandle& m, int bci, JavaThread* thread);
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private:
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RFrame* findTopInlinableFrame(GrowableArray<RFrame*>* stack);
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RFrame* senderOf(RFrame* rf, GrowableArray<RFrame*>* stack);
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// the following variables hold values computed by the last inlining decision
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// they are used for performance debugging only (print better messages)
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static const char* _msg; // reason for not inlining
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static const char* shouldInline (const methodHandle& callee, float frequency, int cnt);
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// positive filter: should send be inlined? returns NULL (--> yes) or rejection msg
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static const char* shouldNotInline(const methodHandle& callee);
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// negative filter: should send NOT be inlined? returns NULL (--> inline) or rejection msg
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};
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#endif
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#endif // SHARE_VM_RUNTIME_COMPILATIONPOLICY_HPP
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