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internal/gclayout: use correct lengths

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The GC bitmap length is measured in multiples of the pointer alignment.
This is equal to the pointer size on all architectures except AVR.
Replace the hardcoded lengths with lengths that are computed naturally.
This commit is contained in:
Nia Waldvogel
2025-12-28 12:46:29 -05:00
committed by Ron Evans
parent a40586d092
commit 9bcca974ba
1 changed files with 6 additions and 4 deletions
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src/internal/gclayout/gclayout.go
+6 -4
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@@ -13,12 +13,14 @@ const (
// 64-bit int => bits = 6
sizeBits = 4 + unsafe.Sizeof(uintptr(0))/4
ptrAlign = unsafe.Alignof(uintptr(0))
sizeShift = sizeBits + 1
NoPtrs = Layout(uintptr(0b0<<sizeShift) | uintptr(0b1<<1) | uintptr(1))
Pointer = Layout(uintptr(0b1<<sizeShift) | uintptr(0b1<<1) | uintptr(1))
String = Layout(uintptr(0b01<<sizeShift) | uintptr(0b10<<1) | uintptr(1))
Slice = Layout(uintptr(0b001<<sizeShift) | uintptr(0b11<<1) | uintptr(1))
NoPtrs = Layout((0 << sizeShift) | (1 << 1) | 1)
Pointer = Layout((1 << sizeShift) | ((unsafe.Sizeof(unsafe.Pointer(nil)) / ptrAlign) << 1) | 1)
String = Layout((1 << sizeShift) | ((unsafe.Sizeof("") / ptrAlign) << 1) | 1)
Slice = Layout((1 << sizeShift) | ((unsafe.Sizeof([]byte{}) / ptrAlign) << 1) | 1)
)
func (l Layout) AsPtr() unsafe.Pointer { return unsafe.Pointer(l) }