| // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #ifndef RUNTIME_VM_CONSTANTS_BASE_H_ |
| #define RUNTIME_VM_CONSTANTS_BASE_H_ |
| |
| namespace dart { |
| |
| // Alignment strategies for how to align values. |
| enum AlignmentStrategy { |
| // Align to the size of the value. |
| kAlignedToValueSize, |
| // Align to the size of the value, but align 8 byte-sized values to 4 bytes. |
| // Both double and int64. |
| kAlignedToValueSizeBut8AlignedTo4, |
| // Align to the architecture size. |
| kAlignedToWordSize, |
| // Align to the greater of architecture size or value size. |
| kAlignedToWordSizeAndValueSize, |
| }; |
| |
| // Minimum size strategies for how to store values. |
| enum ExtensionStrategy { |
| // Values can have arbitrary small size with the upper bits undefined. |
| kNotExtended, |
| // Values smaller than 4 bytes are passed around zero- or sign-extended to |
| // 4 bytes. |
| kExtendedTo4, |
| // Values smaller than 8 bytes are passed around zero- or sign-extended to |
| // 8 bytes. |
| kExtendedTo8, |
| }; |
| |
| } // namespace dart |
| |
| #endif // RUNTIME_VM_CONSTANTS_BASE_H_ |