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ringabout
2026-01-26 16:24:07 +08:00
parent d47605787c
commit 267a29d195
1 changed files with 7 additions and 4 deletions
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11
lib/system/gc.nim
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@@ -453,7 +453,8 @@ template setFrameInfo(c: PCell) =
c.line = 0
proc allocCellWithAlignment(typ: PNimType, size: int, gch: var GcHeap): PCell {.inline.} =
# Allocate a cell with proper alignment based on type requirements
# Allocate a cell with proper alignment based on type requirements.
# Follows the pattern from alignedAlloc in memalloc.nim
let requiredAlign =
if typ.base != nil and typ.base.align > 0:
typ.base.align
@@ -465,10 +466,12 @@ proc allocCellWithAlignment(typ: PNimType, size: int, gch: var GcHeap): PCell {.
result = cast[PCell](rawAlloc(gch.region, size +% sizeof(Cell)))
else:
let extra = requiredAlign -% 1
# allocate (size + align - 1) to ensure alignment
let base = rawAlloc(gch.region, size +% sizeof(Cell) +% extra)
let baseInt = cast[BiggestInt](base)
let userInt = align(baseInt +% sizeof(Cell), requiredAlign)
result = cast[PCell](cast[pointer](userInt -% sizeof(Cell)))
# calculate offset to align the user data (after the Cell header)
# the user data starts at (base + sizeof(Cell)), so we align that address
let offset = requiredAlign -% cast[int]((cast[uint](base) + cast[uint](sizeof(Cell))) and cast[uint](extra))
result = cast[PCell](base +! offset)
proc rawNewObj(typ: PNimType, size: int, gch: var GcHeap): pointer =
# generates a new object and sets its reference counter to 0