405 lines
15 KiB
C++
405 lines
15 KiB
C++
/*
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* Copyright (c) 2014, 2019, 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_MEMORY_ITERATOR_INLINE_HPP
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#define SHARE_MEMORY_ITERATOR_INLINE_HPP
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#include "classfile/classLoaderData.hpp"
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#include "memory/iterator.hpp"
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#include "oops/access.inline.hpp"
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#include "oops/compressedOops.inline.hpp"
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#include "oops/klass.hpp"
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#include "oops/instanceKlass.inline.hpp"
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#include "oops/instanceMirrorKlass.inline.hpp"
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#include "oops/instanceClassLoaderKlass.inline.hpp"
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#include "oops/instanceRefKlass.inline.hpp"
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#include "oops/objArrayKlass.inline.hpp"
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#include "oops/typeArrayKlass.inline.hpp"
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#include "utilities/debug.hpp"
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// Defaults to strong claiming.
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inline MetadataVisitingOopIterateClosure::MetadataVisitingOopIterateClosure(ReferenceDiscoverer* rd) :
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ClaimMetadataVisitingOopIterateClosure(ClassLoaderData::_claim_strong, rd) {}
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inline void ClaimMetadataVisitingOopIterateClosure::do_cld(ClassLoaderData* cld) {
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cld->oops_do(this, _claim);
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}
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inline void ClaimMetadataVisitingOopIterateClosure::do_klass(Klass* k) {
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ClassLoaderData* cld = k->class_loader_data();
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ClaimMetadataVisitingOopIterateClosure::do_cld(cld);
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}
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// Implementation of the non-virtual do_oop dispatch.
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//
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// The same implementation is used for do_metadata, do_klass, and do_cld.
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//
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// Preconditions:
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// - Base has a pure virtual do_oop
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// - Only one of the classes in the inheritance chain from OopClosureType to
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// Base implements do_oop.
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//
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// Given the preconditions:
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// - If &OopClosureType::do_oop is resolved to &Base::do_oop, then there is no
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// implementation of do_oop between Base and OopClosureType. However, there
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// must be one implementation in one of the subclasses of OopClosureType.
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// In this case we take the virtual call.
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//
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// - Conversely, if &OopClosureType::do_oop is not resolved to &Base::do_oop,
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// then we've found the one and only concrete implementation. In this case we
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// take a non-virtual call.
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//
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// Because of this it's clear when we should call the virtual call and
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// when the non-virtual call should be made.
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//
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// The way we find if &OopClosureType::do_oop is resolved to &Base::do_oop is to
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// check if the resulting type of the class of a member-function pointer to
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// &OopClosureType::do_oop is equal to the type of the class of a
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// &Base::do_oop member-function pointer. Template parameter deduction is used
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// to find these types, and then the IsSame trait is used to check if they are
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// equal. Finally, SFINAE is used to select the appropriate implementation.
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//
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// Template parameters:
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// T - narrowOop or oop
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// Receiver - the resolved type of the class of the
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// &OopClosureType::do_oop member-function pointer. That is,
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// the klass with the do_oop member function.
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// Base - klass with the pure virtual do_oop member function.
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// OopClosureType - The dynamic closure type
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//
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// Parameters:
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// closure - The closure to call
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// p - The oop (or narrowOop) field to pass to the closure
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template <typename T, typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<IsSame<Receiver, Base>::value, void>::type
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call_do_oop(void (Receiver::*)(T*), void (Base::*)(T*), OopClosureType* closure, T* p) {
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closure->do_oop(p);
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}
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template <typename T, typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<!IsSame<Receiver, Base>::value, void>::type
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call_do_oop(void (Receiver::*)(T*), void (Base::*)(T*), OopClosureType* closure, T* p) {
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// Sanity check
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STATIC_ASSERT((!IsSame<OopClosureType, OopIterateClosure>::value));
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closure->OopClosureType::do_oop(p);
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}
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template <typename OopClosureType, typename T>
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inline void Devirtualizer::do_oop(OopClosureType* closure, T* p) {
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call_do_oop<T>(&OopClosureType::do_oop, &OopClosure::do_oop, closure, p);
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}
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// Implementation of the non-virtual do_metadata dispatch.
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template <typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<IsSame<Receiver, Base>::value, bool>::type
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call_do_metadata(bool (Receiver::*)(), bool (Base::*)(), OopClosureType* closure) {
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return closure->do_metadata();
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}
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template <typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<!IsSame<Receiver, Base>::value, bool>::type
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call_do_metadata(bool (Receiver::*)(), bool (Base::*)(), OopClosureType* closure) {
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return closure->OopClosureType::do_metadata();
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}
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template <typename OopClosureType>
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inline bool Devirtualizer::do_metadata(OopClosureType* closure) {
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return call_do_metadata(&OopClosureType::do_metadata, &OopIterateClosure::do_metadata, closure);
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}
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// Implementation of the non-virtual do_klass dispatch.
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template <typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<IsSame<Receiver, Base>::value, void>::type
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call_do_klass(void (Receiver::*)(Klass*), void (Base::*)(Klass*), OopClosureType* closure, Klass* k) {
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closure->do_klass(k);
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}
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template <typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<!IsSame<Receiver, Base>::value, void>::type
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call_do_klass(void (Receiver::*)(Klass*), void (Base::*)(Klass*), OopClosureType* closure, Klass* k) {
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closure->OopClosureType::do_klass(k);
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}
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template <typename OopClosureType>
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inline void Devirtualizer::do_klass(OopClosureType* closure, Klass* k) {
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call_do_klass(&OopClosureType::do_klass, &OopIterateClosure::do_klass, closure, k);
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}
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// Implementation of the non-virtual do_cld dispatch.
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template <typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<IsSame<Receiver, Base>::value, void>::type
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call_do_cld(void (Receiver::*)(ClassLoaderData*), void (Base::*)(ClassLoaderData*), OopClosureType* closure, ClassLoaderData* cld) {
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closure->do_cld(cld);
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}
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template <typename Receiver, typename Base, typename OopClosureType>
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static typename EnableIf<!IsSame<Receiver, Base>::value, void>::type
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call_do_cld(void (Receiver::*)(ClassLoaderData*), void (Base::*)(ClassLoaderData*), OopClosureType* closure, ClassLoaderData* cld) {
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closure->OopClosureType::do_cld(cld);
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}
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template <typename OopClosureType>
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void Devirtualizer::do_cld(OopClosureType* closure, ClassLoaderData* cld) {
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call_do_cld(&OopClosureType::do_cld, &OopIterateClosure::do_cld, closure, cld);
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}
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// Dispatch table implementation for *Klass::oop_oop_iterate
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//
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// It allows for a single call to do a multi-dispatch to an optimized version
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// of oop_oop_iterate that statically know all these types:
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// - OopClosureType : static type give at call site
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// - Klass* : dynamic to static type through Klass::id() -> table index
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// - UseCompressedOops : dynamic to static value determined once
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//
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// when users call obj->oop_iterate(&cl).
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//
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// oopDesc::oop_iterate() calls OopOopIterateDispatch::function(klass)(cl, obj, klass),
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// which dispatches to an optimized version of
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// [Instance, ObjArry, etc]Klass::oop_oop_iterate(oop, OopClosureType)
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//
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// OopClosureType :
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// If OopClosureType has an implementation of do_oop (and do_metadata et.al.),
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// then the static type of OopClosureType will be used to allow inlining of
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// do_oop (even though do_oop is virtual). Otherwise, a virtual call will be
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// used when calling do_oop.
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//
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// Klass* :
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// A table mapping from *Klass::ID to function is setup. This happens once
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// when the program starts, when the static _table instance is initialized for
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// the OopOopIterateDispatch specialized with the OopClosureType.
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//
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// UseCompressedOops :
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// Initially the table is populated with an init function, and not the actual
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// oop_oop_iterate function. This is done, so that the first time we dispatch
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// through the init function we check what the value of UseCompressedOops
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// became, and use that to determine if we should install an optimized
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// narrowOop version or optimized oop version of oop_oop_iterate. The appropriate
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// oop_oop_iterate function replaces the init function in the table, and
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// succeeding calls will jump directly to oop_oop_iterate.
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template <typename OopClosureType>
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class OopOopIterateDispatch : public AllStatic {
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private:
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class Table {
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private:
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template <typename KlassType, typename T>
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static void oop_oop_iterate(OopClosureType* cl, oop obj, Klass* k) {
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((KlassType*)k)->KlassType::template oop_oop_iterate<T>(obj, cl);
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}
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template <typename KlassType>
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static void init(OopClosureType* cl, oop obj, Klass* k) {
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OopOopIterateDispatch<OopClosureType>::_table.set_resolve_function_and_execute<KlassType>(cl, obj, k);
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}
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template <typename KlassType>
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void set_init_function() {
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_function[KlassType::ID] = &init<KlassType>;
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}
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template <typename KlassType>
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void set_resolve_function() {
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// Size requirement to prevent word tearing
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// when functions pointers are updated.
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STATIC_ASSERT(sizeof(_function[0]) == sizeof(void*));
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if (UseCompressedOops) {
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_function[KlassType::ID] = &oop_oop_iterate<KlassType, narrowOop>;
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} else {
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_function[KlassType::ID] = &oop_oop_iterate<KlassType, oop>;
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}
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}
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template <typename KlassType>
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void set_resolve_function_and_execute(OopClosureType* cl, oop obj, Klass* k) {
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set_resolve_function<KlassType>();
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_function[KlassType::ID](cl, obj, k);
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}
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public:
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void (*_function[KLASS_ID_COUNT])(OopClosureType*, oop, Klass*);
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Table(){
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set_init_function<InstanceKlass>();
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set_init_function<InstanceRefKlass>();
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set_init_function<InstanceMirrorKlass>();
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set_init_function<InstanceClassLoaderKlass>();
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set_init_function<ObjArrayKlass>();
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set_init_function<TypeArrayKlass>();
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}
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};
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static Table _table;
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public:
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static void (*function(Klass* klass))(OopClosureType*, oop, Klass*) {
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return _table._function[klass->id()];
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}
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};
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template <typename OopClosureType>
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typename OopOopIterateDispatch<OopClosureType>::Table OopOopIterateDispatch<OopClosureType>::_table;
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template <typename OopClosureType>
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class OopOopIterateBoundedDispatch {
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private:
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class Table {
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private:
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template <typename KlassType, typename T>
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static void oop_oop_iterate_bounded(OopClosureType* cl, oop obj, Klass* k, MemRegion mr) {
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((KlassType*)k)->KlassType::template oop_oop_iterate_bounded<T>(obj, cl, mr);
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}
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template <typename KlassType>
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static void init(OopClosureType* cl, oop obj, Klass* k, MemRegion mr) {
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OopOopIterateBoundedDispatch<OopClosureType>::_table.set_resolve_function_and_execute<KlassType>(cl, obj, k, mr);
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}
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template <typename KlassType>
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void set_init_function() {
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_function[KlassType::ID] = &init<KlassType>;
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}
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template <typename KlassType>
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void set_resolve_function() {
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if (UseCompressedOops) {
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_function[KlassType::ID] = &oop_oop_iterate_bounded<KlassType, narrowOop>;
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} else {
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_function[KlassType::ID] = &oop_oop_iterate_bounded<KlassType, oop>;
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}
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}
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template <typename KlassType>
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void set_resolve_function_and_execute(OopClosureType* cl, oop obj, Klass* k, MemRegion mr) {
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set_resolve_function<KlassType>();
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_function[KlassType::ID](cl, obj, k, mr);
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}
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public:
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void (*_function[KLASS_ID_COUNT])(OopClosureType*, oop, Klass*, MemRegion);
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Table(){
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set_init_function<InstanceKlass>();
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set_init_function<InstanceRefKlass>();
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set_init_function<InstanceMirrorKlass>();
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set_init_function<InstanceClassLoaderKlass>();
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set_init_function<ObjArrayKlass>();
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set_init_function<TypeArrayKlass>();
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}
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};
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static Table _table;
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public:
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static void (*function(Klass* klass))(OopClosureType*, oop, Klass*, MemRegion) {
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return _table._function[klass->id()];
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}
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};
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template <typename OopClosureType>
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typename OopOopIterateBoundedDispatch<OopClosureType>::Table OopOopIterateBoundedDispatch<OopClosureType>::_table;
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template <typename OopClosureType>
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class OopOopIterateBackwardsDispatch {
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private:
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class Table {
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private:
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template <typename KlassType, typename T>
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static void oop_oop_iterate_backwards(OopClosureType* cl, oop obj, Klass* k) {
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((KlassType*)k)->KlassType::template oop_oop_iterate_reverse<T>(obj, cl);
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}
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template <typename KlassType>
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static void init(OopClosureType* cl, oop obj, Klass* k) {
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OopOopIterateBackwardsDispatch<OopClosureType>::_table.set_resolve_function_and_execute<KlassType>(cl, obj, k);
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}
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template <typename KlassType>
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void set_init_function() {
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_function[KlassType::ID] = &init<KlassType>;
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}
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template <typename KlassType>
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void set_resolve_function() {
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if (UseCompressedOops) {
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_function[KlassType::ID] = &oop_oop_iterate_backwards<KlassType, narrowOop>;
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} else {
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_function[KlassType::ID] = &oop_oop_iterate_backwards<KlassType, oop>;
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}
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}
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template <typename KlassType>
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void set_resolve_function_and_execute(OopClosureType* cl, oop obj, Klass* k) {
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set_resolve_function<KlassType>();
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_function[KlassType::ID](cl, obj, k);
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}
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public:
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void (*_function[KLASS_ID_COUNT])(OopClosureType*, oop, Klass*);
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Table(){
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set_init_function<InstanceKlass>();
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set_init_function<InstanceRefKlass>();
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set_init_function<InstanceMirrorKlass>();
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set_init_function<InstanceClassLoaderKlass>();
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set_init_function<ObjArrayKlass>();
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set_init_function<TypeArrayKlass>();
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}
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};
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static Table _table;
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public:
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static void (*function(Klass* klass))(OopClosureType*, oop, Klass*) {
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return _table._function[klass->id()];
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}
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};
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template <typename OopClosureType>
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typename OopOopIterateBackwardsDispatch<OopClosureType>::Table OopOopIterateBackwardsDispatch<OopClosureType>::_table;
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template <typename OopClosureType>
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void OopIteratorClosureDispatch::oop_oop_iterate(OopClosureType* cl, oop obj, Klass* klass) {
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OopOopIterateDispatch<OopClosureType>::function(klass)(cl, obj, klass);
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}
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template <typename OopClosureType>
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void OopIteratorClosureDispatch::oop_oop_iterate(OopClosureType* cl, oop obj, Klass* klass, MemRegion mr) {
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OopOopIterateBoundedDispatch<OopClosureType>::function(klass)(cl, obj, klass, mr);
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}
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template <typename OopClosureType>
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void OopIteratorClosureDispatch::oop_oop_iterate_backwards(OopClosureType* cl, oop obj, Klass* klass) {
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OopOopIterateBackwardsDispatch<OopClosureType>::function(klass)(cl, obj, klass);
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}
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#endif // SHARE_MEMORY_ITERATOR_INLINE_HPP
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