| ... | ... | @@ -18,6 +18,60 @@ pub const byte_size_in_bits = 8; |
| 18 | 18 | |
| 19 | 19 | pub const Allocator = @import("mem/Allocator.zig"); |
| 20 | 20 | |
| 21 | /// Stored as a power-of-two. |
| 22 | pub const Alignment = enum(math.Log2Int(usize)) { |
| 23 | @"1" = 0, |
| 24 | @"2" = 1, |
| 25 | @"4" = 2, |
| 26 | @"8" = 3, |
| 27 | @"16" = 4, |
| 28 | @"32" = 5, |
| 29 | @"64" = 6, |
| 30 | _, |
| 31 | |
| 32 | pub fn toByteUnits(a: Alignment) usize { |
| 33 | return @as(usize, 1) << @intFromEnum(a); |
| 34 | } |
| 35 | |
| 36 | pub fn fromByteUnits(n: usize) Alignment { |
| 37 | assert(std.math.isPowerOfTwo(n)); |
| 38 | return @enumFromInt(@ctz(n)); |
| 39 | } |
| 40 | |
| 41 | pub fn order(lhs: Alignment, rhs: Alignment) std.math.Order { |
| 42 | return std.math.order(@intFromEnum(lhs), @intFromEnum(rhs)); |
| 43 | } |
| 44 | |
| 45 | pub fn compare(lhs: Alignment, op: std.math.CompareOperator, rhs: Alignment) bool { |
| 46 | return std.math.compare(@intFromEnum(lhs), op, @intFromEnum(rhs)); |
| 47 | } |
| 48 | |
| 49 | pub fn max(lhs: Alignment, rhs: Alignment) Alignment { |
| 50 | return @enumFromInt(@max(@intFromEnum(lhs), @intFromEnum(rhs))); |
| 51 | } |
| 52 | |
| 53 | pub fn min(lhs: Alignment, rhs: Alignment) Alignment { |
| 54 | return @enumFromInt(@min(@intFromEnum(lhs), @intFromEnum(rhs))); |
| 55 | } |
| 56 | |
| 57 | /// Return next address with this alignment. |
| 58 | pub fn forward(a: Alignment, address: usize) usize { |
| 59 | const x = (@as(usize, 1) << @intFromEnum(a)) - 1; |
| 60 | return (address + x) & ~x; |
| 61 | } |
| 62 | |
| 63 | /// Return previous address with this alignment. |
| 64 | pub fn backward(a: Alignment, address: usize) usize { |
| 65 | const x = (@as(usize, 1) << @intFromEnum(a)) - 1; |
| 66 | return address & ~x; |
| 67 | } |
| 68 | |
| 69 | /// Return whether address is aligned to this amount. |
| 70 | pub fn check(a: Alignment, address: usize) bool { |
| 71 | return @ctz(address) >= @intFromEnum(a); |
| 72 | } |
| 73 | }; |
| 74 | |
| 21 | 75 | /// Detects and asserts if the std.mem.Allocator interface is violated by the caller |
| 22 | 76 | /// or the allocator. |
| 23 | 77 | pub fn ValidationAllocator(comptime T: type) type { |
Andrew Kelley <andrew@ziglang.org> 2025-01-30 18:21:19-08:00
lib