-
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathsql-make-VirtualCursor-standard-layout-type.patch
210 lines (190 loc) · 8.7 KB
/
sql-make-VirtualCursor-standard-layout-type.patch
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
diff -up chromium-94.0.4606.61/sql/recover_module/btree.cc.17~ chromium-94.0.4606.61/sql/recover_module/btree.cc
--- chromium-94.0.4606.61/sql/recover_module/btree.cc.17~ 2021-09-24 06:26:10.000000000 +0200
+++ chromium-94.0.4606.61/sql/recover_module/btree.cc 2021-09-25 02:00:19.610366450 +0200
@@ -136,16 +136,25 @@ static_assert(std::is_trivially_destruct
"Move the destructor to the .cc file if it's non-trival");
#endif // !DCHECK_IS_ON()
-LeafPageDecoder::LeafPageDecoder(DatabasePageReader* db_reader) noexcept
- : page_id_(db_reader->page_id()),
- db_reader_(db_reader),
- cell_count_(ComputeCellCount(db_reader)),
- next_read_index_(0),
- last_record_size_(0) {
+void LeafPageDecoder::Initialize(DatabasePageReader* db_reader) {
+ DCHECK(db_reader);
DCHECK(IsOnValidPage(db_reader));
+ page_id_ = db_reader->page_id();
+ db_reader_ = db_reader;
+ cell_count_ = ComputeCellCount(db_reader);
+ next_read_index_ = 0;
+ last_record_size_ = 0;
DCHECK(DatabasePageReader::IsValidPageId(page_id_));
}
+void LeafPageDecoder::Reset() {
+ db_reader_ = nullptr;
+ page_id_ = 0;
+ cell_count_ = 0;
+ next_read_index_ = 0;
+ last_record_size_ = 0;
+}
+
bool LeafPageDecoder::TryAdvance() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(CanAdvance());
diff -up chromium-94.0.4606.61/sql/recover_module/btree.h.17~ chromium-94.0.4606.61/sql/recover_module/btree.h
--- chromium-94.0.4606.61/sql/recover_module/btree.h.17~ 2021-09-24 06:26:10.000000000 +0200
+++ chromium-94.0.4606.61/sql/recover_module/btree.h 2021-09-25 02:00:19.610366450 +0200
@@ -103,7 +103,7 @@ class LeafPageDecoder {
//
// |db_reader| must have been used to read an inner page of a table B-tree.
// |db_reader| must outlive this instance.
- explicit LeafPageDecoder(DatabasePageReader* db_reader) noexcept;
+ explicit LeafPageDecoder() noexcept = default;
~LeafPageDecoder() noexcept = default;
LeafPageDecoder(const LeafPageDecoder&) = delete;
@@ -151,6 +151,15 @@ class LeafPageDecoder {
// read as long as CanAdvance() returns true.
bool TryAdvance();
+ // Initialize with DatabasePageReader
+ void Initialize(DatabasePageReader* db_reader);
+
+ // Reset internal DatabasePageReader
+ void Reset();
+
+ // True if DatabasePageReader is valid
+ bool IsValid() { return (db_reader_ != nullptr); }
+
// True if the given reader may point to an inner page in a table B-tree.
//
// The last ReadPage() call on |db_reader| must have succeeded.
@@ -164,14 +173,14 @@ class LeafPageDecoder {
static int ComputeCellCount(DatabasePageReader* db_reader);
// The number of the B-tree page this reader is reading.
- const int64_t page_id_;
+ int64_t page_id_;
// Used to read the tree page.
//
// Raw pointer usage is acceptable because this instance's owner is expected
// to ensure that the DatabasePageReader outlives this.
- DatabasePageReader* const db_reader_;
+ DatabasePageReader* db_reader_;
// Caches the ComputeCellCount() value for this reader's page.
- const int cell_count_ = ComputeCellCount(db_reader_);
+ int cell_count_;
// The reader's cursor state.
//
diff -up chromium-94.0.4606.61/sql/recover_module/cursor.cc.17~ chromium-94.0.4606.61/sql/recover_module/cursor.cc
--- chromium-94.0.4606.61/sql/recover_module/cursor.cc.17~ 2021-09-24 06:26:10.000000000 +0200
+++ chromium-94.0.4606.61/sql/recover_module/cursor.cc 2021-09-25 02:00:19.610366450 +0200
@@ -28,7 +28,7 @@ VirtualCursor::~VirtualCursor() {
int VirtualCursor::First() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
inner_decoders_.clear();
- leaf_decoder_ = nullptr;
+ leaf_decoder_.Reset();
AppendPageDecoder(table_->root_page_id());
return Next();
@@ -38,18 +38,18 @@ int VirtualCursor::Next() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
record_reader_.Reset();
- while (!inner_decoders_.empty() || leaf_decoder_.get()) {
- if (leaf_decoder_.get()) {
- if (!leaf_decoder_->CanAdvance()) {
+ while (!inner_decoders_.empty() || leaf_decoder_.IsValid()) {
+ if (leaf_decoder_.IsValid()) {
+ if (!leaf_decoder_.CanAdvance()) {
// The leaf has been exhausted. Remove it from the DFS stack.
- leaf_decoder_ = nullptr;
+ leaf_decoder_.Reset();
continue;
}
- if (!leaf_decoder_->TryAdvance())
+ if (!leaf_decoder_.TryAdvance())
continue;
- if (!payload_reader_.Initialize(leaf_decoder_->last_record_size(),
- leaf_decoder_->last_record_offset())) {
+ if (!payload_reader_.Initialize(leaf_decoder_.last_record_size(),
+ leaf_decoder_.last_record_offset())) {
continue;
}
if (!record_reader_.Initialize())
@@ -101,13 +101,13 @@ int VirtualCursor::ReadColumn(int column
int64_t VirtualCursor::RowId() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(record_reader_.IsInitialized());
- DCHECK(leaf_decoder_.get());
- return leaf_decoder_->last_record_rowid();
+ DCHECK(leaf_decoder_.IsValid());
+ return leaf_decoder_.last_record_rowid();
}
void VirtualCursor::AppendPageDecoder(int page_id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
- DCHECK(leaf_decoder_.get() == nullptr)
+ DCHECK(!leaf_decoder_.IsValid())
<< __func__
<< " must only be called when the current path has no leaf decoder";
@@ -115,7 +115,7 @@ void VirtualCursor::AppendPageDecoder(in
return;
if (LeafPageDecoder::IsOnValidPage(&db_reader_)) {
- leaf_decoder_ = std::make_unique<LeafPageDecoder>(&db_reader_);
+ leaf_decoder_.Initialize(&db_reader_);
return;
}
diff -up chromium-94.0.4606.61/sql/recover_module/cursor.h.17~ chromium-94.0.4606.61/sql/recover_module/cursor.h
--- chromium-94.0.4606.61/sql/recover_module/cursor.h.17~ 2021-09-24 06:26:10.000000000 +0200
+++ chromium-94.0.4606.61/sql/recover_module/cursor.h 2021-09-25 02:00:19.610366450 +0200
@@ -129,7 +129,7 @@ class VirtualCursor {
std::vector<std::unique_ptr<InnerPageDecoder>> inner_decoders_;
// Decodes the leaf page containing records.
- std::unique_ptr<LeafPageDecoder> leaf_decoder_;
+ LeafPageDecoder leaf_decoder_;
SEQUENCE_CHECKER(sequence_checker_);
};
diff -up chromium-94.0.4606.61/sql/recover_module/pager.cc.17~ chromium-94.0.4606.61/sql/recover_module/pager.cc
--- chromium-94.0.4606.61/sql/recover_module/pager.cc.17~ 2021-09-24 06:26:10.000000000 +0200
+++ chromium-94.0.4606.61/sql/recover_module/pager.cc 2021-09-25 02:00:19.610366450 +0200
@@ -23,8 +23,7 @@ static_assert(DatabasePageReader::kMaxPa
"ints are not appropriate for representing page IDs");
DatabasePageReader::DatabasePageReader(VirtualTable* table)
- : page_data_(std::make_unique<uint8_t[]>(table->page_size())),
- table_(table) {
+ : page_data_(), table_(table) {
DCHECK(table != nullptr);
DCHECK(IsValidPageSize(table->page_size()));
}
@@ -57,8 +56,8 @@ int DatabasePageReader::ReadPage(int pag
std::numeric_limits<int64_t>::max(),
"The |read_offset| computation above may overflow");
- int sqlite_status =
- RawRead(sqlite_file, read_size, read_offset, page_data_.get());
+ int sqlite_status = RawRead(sqlite_file, read_size, read_offset,
+ const_cast<uint8_t*>(page_data_.data()));
// |page_id_| needs to be set to kInvalidPageId if the read failed.
// Otherwise, future ReadPage() calls with the previous |page_id_| value
diff -up chromium-94.0.4606.61/sql/recover_module/pager.h.17~ chromium-94.0.4606.61/sql/recover_module/pager.h
--- chromium-94.0.4606.61/sql/recover_module/pager.h.17~ 2021-09-24 06:26:10.000000000 +0200
+++ chromium-94.0.4606.61/sql/recover_module/pager.h 2021-09-25 02:00:59.844573377 +0200
@@ -5,6 +5,7 @@
#ifndef SQL_RECOVER_MODULE_PAGER_H_
#define SQL_RECOVER_MODULE_PAGER_H_
+#include <array>
#include <cstdint>
#include <memory>
#include <ostream>
@@ -71,7 +72,7 @@ class DatabasePageReader {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(page_id_, kInvalidPageId)
<< "Successful ReadPage() required before accessing pager state";
- return page_data_.get();
+ return page_data_.data();
}
// The number of bytes in the page read by the last ReadPage() call.
@@ -138,7 +139,7 @@ class DatabasePageReader {
int page_id_ = kInvalidPageId;
// Stores the bytes of the last page successfully read by ReadPage().
// The content is undefined if the last call to ReadPage() did not succeed.
- const std::unique_ptr<uint8_t[]> page_data_;
+ const std::array<uint8_t, kMaxPageSize> page_data_;
// Raw pointer usage is acceptable because this instance's owner is expected
// to ensure that the VirtualTable outlives this.
VirtualTable* const table_;