1/*
2 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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24
25#ifndef SHARE_GC_PARALLEL_PSCLOSURE_INLINE_HPP
26#define SHARE_GC_PARALLEL_PSCLOSURE_INLINE_HPP
27
28#include "gc/parallel/psPromotionManager.inline.hpp"
29#include "gc/parallel/psScavenge.inline.hpp"
30#include "memory/iterator.hpp"
31#include "oops/access.inline.hpp"
32#include "oops/oop.inline.hpp"
33#include "utilities/globalDefinitions.hpp"
34
35template <bool promote_immediately>
36class PSRootsClosure: public OopClosure {
37private:
38 PSPromotionManager* _promotion_manager;
39
40 template <class T> void do_oop_work(T *p) {
41 if (PSScavenge::should_scavenge(p)) {
42 // We never card mark roots, maybe call a func without test?
43 _promotion_manager->copy_and_push_safe_barrier<T, promote_immediately>(p);
44 }
45 }
46public:
47 PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
48 void do_oop(oop* p) { PSRootsClosure::do_oop_work(p); }
49 void do_oop(narrowOop* p) { PSRootsClosure::do_oop_work(p); }
50};
51
52typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure;
53typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure;
54
55// Scavenges a single oop in a ClassLoaderData.
56class PSScavengeFromCLDClosure: public OopClosure {
57private:
58 PSPromotionManager* _pm;
59 // Used to redirty a scanned cld if it has oops
60 // pointing to the young generation after being scanned.
61 ClassLoaderData* _scanned_cld;
62public:
63 PSScavengeFromCLDClosure(PSPromotionManager* pm) : _pm(pm), _scanned_cld(NULL) { }
64 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
65 void do_oop(oop* p) {
66 ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
67 assert(!psh->is_in_reserved(p), "GC barrier needed");
68 if (PSScavenge::should_scavenge(p)) {
69 assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
70
71 oop o = *p;
72 oop new_obj;
73 if (o->is_forwarded()) {
74 new_obj = o->forwardee();
75 } else {
76 new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o);
77 }
78 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
79
80 if (PSScavenge::is_obj_in_young(new_obj)) {
81 do_cld_barrier();
82 }
83 }
84 }
85
86 void set_scanned_cld(ClassLoaderData* cld) {
87 assert(_scanned_cld == NULL || cld == NULL, "Should always only handling one cld at a time");
88 _scanned_cld = cld;
89 }
90
91private:
92 void do_cld_barrier() {
93 assert(_scanned_cld != NULL, "Should not be called without having a scanned cld");
94 _scanned_cld->record_modified_oops();
95 }
96};
97
98// Scavenges the oop in a ClassLoaderData.
99class PSScavengeCLDClosure: public CLDClosure {
100private:
101 PSScavengeFromCLDClosure _oop_closure;
102public:
103 PSScavengeCLDClosure(PSPromotionManager* pm) : _oop_closure(pm) { }
104 void do_cld(ClassLoaderData* cld) {
105 // If the cld has not been dirtied we know that there's
106 // no references into the young gen and we can skip it.
107
108 if (cld->has_modified_oops()) {
109 // Setup the promotion manager to redirty this cld
110 // if references are left in the young gen.
111 _oop_closure.set_scanned_cld(cld);
112
113 // Clean the cld since we're going to scavenge all the metadata.
114 cld->oops_do(&_oop_closure, false, /*clear_modified_oops*/true);
115
116 _oop_closure.set_scanned_cld(NULL);
117 }
118 }
119};
120
121#endif // SHARE_GC_PARALLEL_PSCLOSURE_INLINE_HPP
122