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Side by Side Diff: src/zone/zone-segment.h

Issue 2401173002: Version 5.6.1.1 (cherry-pick) (Closed)
Patch Set: Created 4 years, 2 months ago
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1 // Copyright 2016 the V8 project authors. All rights reserved. 1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef V8_ZONE_ZONE_SEGMENT_H_ 5 #ifndef V8_ZONE_ZONE_SEGMENT_H_
6 #define V8_ZONE_ZONE_SEGMENT_H_ 6 #define V8_ZONE_ZONE_SEGMENT_H_
7 7
8 #include "src/v8.h" 8 #include "src/v8.h"
9 9
10 // Segments represent chunks of memory: They have starting address 10 // Segments represent chunks of memory: They have starting address
11 // (encoded in the this pointer) and a size in bytes. Segments are 11 // (encoded in the this pointer) and a size in bytes. Segments are
12 // chained together forming a LIFO structure with the newest segment 12 // chained together forming a LIFO structure with the newest segment
13 // available as segment_head_. Segments are allocated using malloc() 13 // available as segment_head_. Segments are allocated using malloc()
14 // and de-allocated using free(). 14 // and de-allocated using free().
15 namespace v8 { 15 namespace v8 {
16 namespace internal { 16 namespace internal {
17 17
18 // Forward declaration 18 // Forward declaration
19 class Zone; 19 class Zone;
20 20
21 class Segment { 21 class Segment {
22 public: 22 public:
23 void Initialize(size_t size) { size_ = size; } 23 void Initialize(Segment* next, size_t size, Zone* zone) {
24 next_ = next;
25 size_ = size;
26 zone_ = zone;
27 }
24 28
25 Zone* zone() const { return zone_; } 29 Zone* zone() const { return zone_; }
26 void set_zone(Zone* const zone) { zone_ = zone; } 30 void set_zone(Zone* const zone) { zone_ = zone; }
27 31
28 Segment* next() const { return next_; } 32 Segment* next() const { return next_; }
29 void set_next(Segment* const next) { next_ = next; } 33 void set_next(Segment* const next) { next_ = next; }
30 34
31 size_t size() const { return size_; } 35 size_t size() const { return size_; }
32 size_t capacity() const { return size_ - sizeof(Segment); } 36 size_t capacity() const { return size_ - sizeof(Segment); }
33 37
34 Address start() const { return address(sizeof(Segment)); } 38 Address start() const { return address(sizeof(Segment)); }
35 Address end() const { return address(size_); } 39 Address end() const { return address(size_); }
36 40
37 // Zap the contents of the segment (but not the header). 41 // Zap the contents of the segment (but not the header).
38 void ZapContents(); 42 void ZapContents();
39 // Zaps the header and makes the segment unusable this way. 43 // Zaps the header and makes the segment unusable this way.
40 void ZapHeader(); 44 void ZapHeader();
41 45
42 private: 46 private:
43 #ifdef DEBUG 47 #ifdef DEBUG
44 // Constant byte value used for zapping dead memory in debug mode. 48 // Constant byte value used for zapping dead memory in debug mode.
45 static const unsigned char kZapDeadByte = 0xcd; 49 static const unsigned char kZapDeadByte = 0xcd;
46 #endif 50 #endif
47
48 // Computes the address of the nth byte in this segment. 51 // Computes the address of the nth byte in this segment.
49 Address address(size_t n) const { return Address(this) + n; } 52 Address address(size_t n) const { return Address(this) + n; }
50 53
51 Zone* zone_; 54 Zone* zone_;
52 Segment* next_; 55 Segment* next_;
53 size_t size_; 56 size_t size_;
54 }; 57 };
55 } // namespace internal 58 } // namespace internal
56 } // namespace v8 59 } // namespace v8
57 60
58 #endif // V8_ZONE_ZONE_SEGMENT_H_ 61 #endif // V8_ZONE_ZONE_SEGMENT_H_
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