1 /*
2 * Copyright (c) 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 *
27
28 #include "logging/log.hpp"
29 #include "runtime/arguments.hpp"
30 #include "utilities/bitMap.hpp"
31
32 // ArchivePtrMarker is used to mark the location of pointers embedded in a CDS archive. E.g., when an
33 // InstanceKlass k is dumped, we mark the location of the k->_name pointer by effectively calling
34 // mark_pointer(/*ptr_loc=*/&k->_name). It's required that (_prt_base <= ptr_loc < _ptr_end). _ptr_base is
35 // fixed, but _ptr_end can be expanded as more objects are dumped.
36 class ArchivePtrMarker : AllStatic {
37 static CHeapBitMap* _ptrmap;
38 static address* _ptr_base;
39 static address* _ptr_end;
40
41 // Once _ptrmap is compacted, we don't allow bit marking anymore. This is to
42 // avoid unintentional copy operations after the bitmap has been finalized and written.
43 static bool _compacted;
44 public:
45 static void initialize(CHeapBitMap* ptrmap, address* ptr_base, address* ptr_end);
46 static void mark_pointer(address* ptr_loc);
47 static void compact(address relocatable_base, address relocatable_end);
48 static void compact(size_t max_non_null_offset);
49
50 template <typename T>
51 static void mark_pointer(T* ptr_loc) {
52 mark_pointer((address*)ptr_loc);
53 }
54
55 static void expand_ptr_end(address *new_ptr_end) {
56 assert(_ptr_end <= new_ptr_end, "must be");
57 _ptr_end = new_ptr_end;
58 }
59
60 static CHeapBitMap* ptrmap() {
61 return _ptrmap;
62 }
63 };
64
65 // SharedDataRelocator is used to shift pointers in the CDS archive.
66 //
67 // The CDS archive is basically a contiguous block of memory (divided into several regions)
68 // that contains multiple objects. The objects may contain direct pointers that point to other objects
69 // within the archive (e.g., InstanceKlass::_name points to a Symbol in the archive). During dumping, we
70 // built a bitmap that marks the locations of all these pointers (using ArchivePtrMarker, see comments above).
71 //
72 // The contents of the archive assumes that it’s mapped at the default SharedBaseAddress (e.g. 0x800000000).
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1 /*
2 * Copyright (c) 2019, 2020, 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 *
27
28 #include "logging/log.hpp"
29 #include "runtime/arguments.hpp"
30 #include "utilities/bitMap.hpp"
31
32 // ArchivePtrMarker is used to mark the location of pointers embedded in a CDS archive. E.g., when an
33 // InstanceKlass k is dumped, we mark the location of the k->_name pointer by effectively calling
34 // mark_pointer(/*ptr_loc=*/&k->_name). It's required that (_prt_base <= ptr_loc < _ptr_end). _ptr_base is
35 // fixed, but _ptr_end can be expanded as more objects are dumped.
36 class ArchivePtrMarker : AllStatic {
37 static CHeapBitMap* _ptrmap;
38 static address* _ptr_base;
39 static address* _ptr_end;
40
41 // Once _ptrmap is compacted, we don't allow bit marking anymore. This is to
42 // avoid unintentional copy operations after the bitmap has been finalized and written.
43 static bool _compacted;
44 public:
45 static void initialize(CHeapBitMap* ptrmap, address* ptr_base, address* ptr_end);
46 static void mark_pointer(address* ptr_loc);
47 static void clear_pointer(address* ptr_loc);
48 static void compact(address relocatable_base, address relocatable_end);
49 static void compact(size_t max_non_null_offset);
50
51 template <typename T>
52 static void mark_pointer(T* ptr_loc) {
53 mark_pointer((address*)ptr_loc);
54 }
55
56 template <typename T>
57 static void set_and_mark_pointer(T* ptr_loc, T ptr_value) {
58 *ptr_loc = ptr_value;
59 mark_pointer(ptr_loc);
60 }
61
62 static void expand_ptr_end(address *new_ptr_end) {
63 assert(_ptr_end <= new_ptr_end, "must be");
64 _ptr_end = new_ptr_end;
65 }
66
67 static CHeapBitMap* ptrmap() {
68 return _ptrmap;
69 }
70 };
71
72 // SharedDataRelocator is used to shift pointers in the CDS archive.
73 //
74 // The CDS archive is basically a contiguous block of memory (divided into several regions)
75 // that contains multiple objects. The objects may contain direct pointers that point to other objects
76 // within the archive (e.g., InstanceKlass::_name points to a Symbol in the archive). During dumping, we
77 // built a bitmap that marks the locations of all these pointers (using ArchivePtrMarker, see comments above).
78 //
79 // The contents of the archive assumes that it’s mapped at the default SharedBaseAddress (e.g. 0x800000000).
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