1 /*
2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
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 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
24 #ifndef SHARE_GC_Z_ZBARRIER_HPP
25 #define SHARE_GC_Z_ZBARRIER_HPP
26
27 #include "memory/allocation.hpp"
28 #include "oops/oop.hpp"
29
30 typedef bool (*ZBarrierFastPath)(uintptr_t);
31 typedef uintptr_t (*ZBarrierSlowPath)(uintptr_t);
32
33 class ZBarrier : public AllStatic {
34 private:
35 static const bool Follow = true;
36 static const bool DontFollow = false;
37
38 static const bool Strong = false;
39 static const bool Finalizable = true;
40
41 static const bool Publish = true;
42 static const bool Overflow = false;
43
44 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop barrier(volatile oop* p, oop o);
45 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop weak_barrier(volatile oop* p, oop o);
46 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static void root_barrier(oop* p, oop o);
47
48 static bool is_null_fast_path(uintptr_t addr);
49 static bool is_good_or_null_fast_path(uintptr_t addr);
50 static bool is_weak_good_or_null_fast_path(uintptr_t addr);
51
52 static bool is_resurrection_blocked(volatile oop* p, oop* o);
53
54 static bool during_mark();
55 static bool during_relocate();
56 template <bool finalizable> static bool should_mark_through(uintptr_t addr);
57 template <bool follow, bool finalizable, bool publish> static uintptr_t mark(uintptr_t addr);
58 static uintptr_t remap(uintptr_t addr);
59 static uintptr_t relocate(uintptr_t addr);
60 static uintptr_t relocate_or_mark(uintptr_t addr);
61 static uintptr_t relocate_or_remap(uintptr_t addr);
62
63 static uintptr_t load_barrier_on_oop_slow_path(uintptr_t addr);
64
65 static uintptr_t weak_load_barrier_on_oop_slow_path(uintptr_t addr);
66 static uintptr_t weak_load_barrier_on_weak_oop_slow_path(uintptr_t addr);
67 static uintptr_t weak_load_barrier_on_phantom_oop_slow_path(uintptr_t addr);
68
69 static uintptr_t keep_alive_barrier_on_weak_oop_slow_path(uintptr_t addr);
70 static uintptr_t keep_alive_barrier_on_phantom_oop_slow_path(uintptr_t addr);
71
72 static uintptr_t mark_barrier_on_oop_slow_path(uintptr_t addr);
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1 /*
2 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
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 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
24 #ifndef SHARE_GC_Z_ZBARRIER_HPP
25 #define SHARE_GC_Z_ZBARRIER_HPP
26
27 #include "memory/allocation.hpp"
28 #include "oops/oop.hpp"
29
30 typedef bool (*ZBarrierFastPath)(uintptr_t);
31 typedef uintptr_t (*ZBarrierSlowPath)(uintptr_t);
32
33 class ZBarrier : public AllStatic {
34 private:
35 static const bool Follow = true;
36 static const bool DontFollow = false;
37
38 static const bool Strong = false;
39 static const bool Finalizable = true;
40
41 static const bool Publish = true;
42 static const bool Overflow = false;
43
44 static void self_heal(volatile oop* p, uintptr_t addr, uintptr_t heal_addr);
45
46 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop barrier(volatile oop* p, oop o);
47 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static oop weak_barrier(volatile oop* p, oop o);
48 template <ZBarrierFastPath fast_path, ZBarrierSlowPath slow_path> static void root_barrier(oop* p, oop o);
49
50 static bool is_null_fast_path(uintptr_t addr);
51 static bool is_good_or_null_fast_path(uintptr_t addr);
52 static bool is_weak_good_or_null_fast_path(uintptr_t addr);
53
54 static bool during_mark();
55 static bool during_relocate();
56 template <bool finalizable> static bool should_mark_through(uintptr_t addr);
57 template <bool follow, bool finalizable, bool publish> static uintptr_t mark(uintptr_t addr);
58 static uintptr_t remap(uintptr_t addr);
59 static uintptr_t relocate(uintptr_t addr);
60 static uintptr_t relocate_or_mark(uintptr_t addr);
61 static uintptr_t relocate_or_remap(uintptr_t addr);
62
63 static uintptr_t load_barrier_on_oop_slow_path(uintptr_t addr);
64
65 static uintptr_t weak_load_barrier_on_oop_slow_path(uintptr_t addr);
66 static uintptr_t weak_load_barrier_on_weak_oop_slow_path(uintptr_t addr);
67 static uintptr_t weak_load_barrier_on_phantom_oop_slow_path(uintptr_t addr);
68
69 static uintptr_t keep_alive_barrier_on_weak_oop_slow_path(uintptr_t addr);
70 static uintptr_t keep_alive_barrier_on_phantom_oop_slow_path(uintptr_t addr);
71
72 static uintptr_t mark_barrier_on_oop_slow_path(uintptr_t addr);
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