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Side by Side Diff: runtime/vm/bitfield.h

Issue 2481873005: clang-format runtime/vm (Closed)
Patch Set: Merge Created 4 years, 1 month ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #ifndef RUNTIME_VM_BITFIELD_H_ 5 #ifndef RUNTIME_VM_BITFIELD_H_
6 #define RUNTIME_VM_BITFIELD_H_ 6 #define RUNTIME_VM_BITFIELD_H_
7 7
8 namespace dart { 8 namespace dart {
9 9
10 static const uword kUwordOne = 1U; 10 static const uword kUwordOne = 1U;
11 11
12 // BitField is a template for encoding and decoding a value of type T 12 // BitField is a template for encoding and decoding a value of type T
13 // inside a storage of type S. 13 // inside a storage of type S.
14 template<typename S, typename T, int position, int size> 14 template <typename S, typename T, int position, int size>
15 class BitField { 15 class BitField {
16 public: 16 public:
17 static const intptr_t kNextBit = position + size; 17 static const intptr_t kNextBit = position + size;
18 18
19 // Tells whether the provided value fits into the bit field. 19 // Tells whether the provided value fits into the bit field.
20 static bool is_valid(T value) { 20 static bool is_valid(T value) {
21 return (static_cast<S>(value) & ~((kUwordOne << size) - 1)) == 0; 21 return (static_cast<S>(value) & ~((kUwordOne << size) - 1)) == 0;
22 } 22 }
23 23
24 // Returns a S mask of the bit field. 24 // Returns a S mask of the bit field.
25 static S mask() { 25 static S mask() { return (kUwordOne << size) - 1; }
26 return (kUwordOne << size) - 1;
27 }
28 26
29 // Returns a S mask of the bit field which can be applied directly to 27 // Returns a S mask of the bit field which can be applied directly to
30 // to the raw unshifted bits. 28 // to the raw unshifted bits.
31 static S mask_in_place() { 29 static S mask_in_place() { return ((kUwordOne << size) - 1) << position; }
32 return ((kUwordOne << size) - 1) << position;
33 }
34 30
35 // Returns the shift count needed to right-shift the bit field to 31 // Returns the shift count needed to right-shift the bit field to
36 // the least-significant bits. 32 // the least-significant bits.
37 static int shift() { 33 static int shift() { return position; }
38 return position;
39 }
40 34
41 // Returns the size of the bit field. 35 // Returns the size of the bit field.
42 static int bitsize() { 36 static int bitsize() { return size; }
43 return size;
44 }
45 37
46 // Returns an S with the bit field value encoded. 38 // Returns an S with the bit field value encoded.
47 static S encode(T value) { 39 static S encode(T value) {
48 COMPILE_ASSERT((sizeof(S) * kBitsPerByte) >= (position + size)); 40 COMPILE_ASSERT((sizeof(S) * kBitsPerByte) >= (position + size));
49 ASSERT(is_valid(value)); 41 ASSERT(is_valid(value));
50 return static_cast<S>(value) << position; 42 return static_cast<S>(value) << position;
51 } 43 }
52 44
53 // Extracts the bit field from the value. 45 // Extracts the bit field from the value.
54 static T decode(S value) { 46 static T decode(S value) {
55 return static_cast<T>((value >> position) & ((kUwordOne << size) - 1)); 47 return static_cast<T>((value >> position) & ((kUwordOne << size) - 1));
56 } 48 }
57 49
58 // Returns an S with the bit field value encoded based on the 50 // Returns an S with the bit field value encoded based on the
59 // original value. Only the bits corresponding to this bit field 51 // original value. Only the bits corresponding to this bit field
60 // will be changed. 52 // will be changed.
61 static S update(T value, S original) { 53 static S update(T value, S original) {
62 ASSERT(is_valid(value)); 54 ASSERT(is_valid(value));
63 return (static_cast<S>(value) << position) | 55 return (static_cast<S>(value) << position) | (~mask_in_place() & original);
64 (~mask_in_place() & original);
65 } 56 }
66 }; 57 };
67 58
68 } // namespace dart 59 } // namespace dart
69 60
70 #endif // RUNTIME_VM_BITFIELD_H_ 61 #endif // RUNTIME_VM_BITFIELD_H_
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