Mercurial > hg > truffle
view src/share/vm/gc_implementation/parallelScavenge/psScavenge.inline.hpp @ 15250:4c68a0eb69ca
mx: refactored JMH benchmark building and dependency creation out of 'jmh' into 'buildjmh' and 'makejmhdeps' respectively
author | Doug Simon <doug.simon@oracle.com> |
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date | Sat, 19 Apr 2014 00:41:04 +0200 |
parents | 190899198332 |
children | 78bbf4d43a14 |
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/* * Copyright (c) 2002, 2013, 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. * */ #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" #include "gc_implementation/parallelScavenge/psScavenge.hpp" #include "memory/iterator.hpp" inline void PSScavenge::save_to_space_top_before_gc() { ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); _to_space_top_before_gc = heap->young_gen()->to_space()->top(); } template <class T> inline bool PSScavenge::should_scavenge(T* p) { T heap_oop = oopDesc::load_heap_oop(p); return PSScavenge::is_obj_in_young(heap_oop); } template <class T> inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) { if (should_scavenge(p)) { oop obj = oopDesc::load_decode_heap_oop_not_null(p); // Skip objects copied to to_space since the scavenge started. HeapWord* const addr = (HeapWord*)obj; return addr < to_space_top_before_gc() || addr >= to_space->end(); } return false; } template <class T> inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) { if (check_to_space) { ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); return should_scavenge(p, heap->young_gen()->to_space()); } return should_scavenge(p); } // Attempt to "claim" oop at p via CAS, push the new obj if successful // This version tests the oop* to make sure it is within the heap before // attempting marking. template <class T, bool promote_immediately> inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm, T* p) { assert(should_scavenge(p, true), "revisiting object?"); oop o = oopDesc::load_decode_heap_oop_not_null(p); oop new_obj = o->is_forwarded() ? o->forwardee() : pm->copy_to_survivor_space<promote_immediately>(o); #ifndef PRODUCT // This code must come after the CAS test, or it will print incorrect // information. if (TraceScavenge && o->is_forwarded()) { gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", "forwarding", new_obj->klass()->internal_name(), (void *)o, (void *)new_obj, new_obj->size()); } #endif oopDesc::encode_store_heap_oop_not_null(p, new_obj); // We cannot mark without test, as some code passes us pointers // that are outside the heap. These pointers are either from roots // or from metadata. if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) && Universe::heap()->is_in_reserved(p)) { if (PSScavenge::is_obj_in_young(new_obj)) { card_table()->inline_write_ref_field_gc(p, new_obj); } } } template<bool promote_immediately> class PSRootsClosure: public OopClosure { private: PSPromotionManager* _promotion_manager; protected: template <class T> void do_oop_work(T *p) { if (PSScavenge::should_scavenge(p)) { // We never card mark roots, maybe call a func without test? PSScavenge::copy_and_push_safe_barrier<T, promote_immediately>(_promotion_manager, p); } } public: PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { } void do_oop(oop* p) { PSRootsClosure::do_oop_work(p); } void do_oop(narrowOop* p) { PSRootsClosure::do_oop_work(p); } }; typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure; typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure; // Scavenges a single oop in a Klass. class PSScavengeFromKlassClosure: public OopClosure { private: PSPromotionManager* _pm; // Used to redirty a scanned klass if it has oops // pointing to the young generation after being scanned. Klass* _scanned_klass; public: PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(NULL) { } void do_oop(narrowOop* p) { ShouldNotReachHere(); } void do_oop(oop* p) { ParallelScavengeHeap* psh = ParallelScavengeHeap::heap(); assert(!psh->is_in_reserved(p), "GC barrier needed"); if (PSScavenge::should_scavenge(p)) { assert(!Universe::heap()->is_in_reserved(p), "Not from meta-data?"); assert(PSScavenge::should_scavenge(p, true), "revisiting object?"); oop o = *p; oop new_obj; if (o->is_forwarded()) { new_obj = o->forwardee(); } else { new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o); } oopDesc::encode_store_heap_oop_not_null(p, new_obj); if (PSScavenge::is_obj_in_young(new_obj)) { do_klass_barrier(); } } } void set_scanned_klass(Klass* klass) { assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time"); _scanned_klass = klass; } private: void do_klass_barrier() { assert(_scanned_klass != NULL, "Should not be called without having a scanned klass"); _scanned_klass->record_modified_oops(); } }; // Scavenges the oop in a Klass. class PSScavengeKlassClosure: public KlassClosure { private: PSScavengeFromKlassClosure _oop_closure; protected: public: PSScavengeKlassClosure(PSPromotionManager* pm) : _oop_closure(pm) { } void do_klass(Klass* klass) { // If the klass has not been dirtied we know that there's // no references into the young gen and we can skip it. #ifndef PRODUCT if (TraceScavenge) { ResourceMark rm; gclog_or_tty->print_cr("PSScavengeKlassClosure::do_klass %p, %s, dirty: %s", klass, klass->external_name(), klass->has_modified_oops() ? "true" : "false"); } #endif if (klass->has_modified_oops()) { // Clean the klass since we're going to scavenge all the metadata. klass->clear_modified_oops(); // Setup the promotion manager to redirty this klass // if references are left in the young gen. _oop_closure.set_scanned_klass(klass); klass->oops_do(&_oop_closure); _oop_closure.set_scanned_klass(NULL); } } }; #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP