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Fix alignment issues with Small_Stack

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gingerBill
2026-09-02 13:01:58 +01:00
parent 085af86dac
commit 2f3baf40c0
1 changed files with 11 additions and 2 deletions
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13
core/mem/allocators.odin
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@@ -1338,6 +1338,9 @@ small_stack_alloc_non_zeroed :: proc(
return raw_data(bytes), err
}
@(private="file")
SMALL_STACK_MAX_ALIGNMENT :: 1 << (8*size_of(Small_Stack_Allocation_Header{}.padding) - 1)
/*
Allocate memory from a small stack allocator.
@@ -1356,7 +1359,10 @@ small_stack_alloc_bytes_non_zeroed :: proc(
panic("Allocation on an uninitialized Small Stack allocator.", loc)
}
alignment := alignment
alignment = clamp(alignment, 1, 8*size_of(Stack_Allocation_Header{}.padding)/2)
alignment = max(alignment, 1)
if alignment > SMALL_STACK_MAX_ALIGNMENT {
return nil, .Invalid_Argument
}
curr_addr := uintptr(raw_data(s.data)) + uintptr(s.offset)
padding := calc_padding_with_header(curr_addr, uintptr(alignment), size_of(Small_Stack_Allocation_Header))
if s.offset + padding + size > len(s.data) {
@@ -1544,7 +1550,10 @@ small_stack_resize_bytes_non_zeroed :: proc(
old_memory := raw_data(old_data)
old_size := len(old_data)
alignment := alignment
alignment = clamp(alignment, 1, 8*size_of(Stack_Allocation_Header{}.padding)/2)
alignment = max(alignment, 1)
if alignment > SMALL_STACK_MAX_ALIGNMENT {
return nil, .Invalid_Argument
}
if old_memory == nil {
return small_stack_alloc_bytes_non_zeroed(s, size, alignment, loc)
}