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mem: Clarify Buddy_Allocator requirements

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Feoramund
2025-07-22 10:52:55 -04:00
parent 58f32cd690
commit a0efdf26a6
1 changed files with 4 additions and 1 deletions
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core/mem/allocators.odin
+4 -1
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@@ -2223,6 +2223,9 @@ Initialize a buddy allocator.
This procedure initializes the buddy allocator `b` with a backing buffer `data` This procedure initializes the buddy allocator `b` with a backing buffer `data`
and block alignment specified by `alignment`. and block alignment specified by `alignment`.
`alignment` may be any power of two, but the backing buffer must be aligned to
at least `size_of(Buddy_Block)`.
*/ */
buddy_allocator_init :: proc(b: ^Buddy_Allocator, data: []byte, alignment: uint, loc := #caller_location) { buddy_allocator_init :: proc(b: ^Buddy_Allocator, data: []byte, alignment: uint, loc := #caller_location) {
assert(data != nil) assert(data != nil)
@@ -2233,7 +2236,7 @@ buddy_allocator_init :: proc(b: ^Buddy_Allocator, data: []byte, alignment: uint,
alignment = size_of(Buddy_Block) alignment = size_of(Buddy_Block)
} }
ptr := raw_data(data) ptr := raw_data(data)
assert(uintptr(ptr) % uintptr(alignment) == 0, "data is not aligned to minimum alignment", loc) assert(uintptr(ptr) % uintptr(alignment) == 0, "The data is not aligned to the minimum alignment, which must be at least `size_of(Buddy_Block)`.", loc)
b.head = (^Buddy_Block)(ptr) b.head = (^Buddy_Block)(ptr)
b.head.size = len(data) b.head.size = len(data)
b.head.is_free = true b.head.is_free = true