proc allocImpl(size: Natural): pointer =
  c_malloc(size.csize_t)

proc alloc0Impl(size: Natural): pointer =
  c_calloc(size.csize_t, 1)

proc reallocImpl(p: pointer, newsize: Natural): pointer =
  c_realloc(p, newSize.csize_t)

proc realloc0Impl(p: pointer, oldsize, newsize: Natural): pointer =
  result = realloc(p, newsize.csize_t)
  if newsize > oldsize:
    zeroMem(cast[pointer](cast[int](result) + oldsize), newsize - oldsize)

proc deallocImpl(p: pointer) =
  c_free(p)


# The shared allocators map on the regular ones

proc allocSharedImpl(size: Natural): pointer =
  allocImpl(size)

proc allocShared0Impl(size: Natural): pointer =
  alloc0Impl(size)

proc reallocSharedImpl(p: pointer, newsize: Natural): pointer =
  reallocImpl(p, newsize)

proc reallocShared0Impl(p: pointer, oldsize, newsize: Natural): pointer =
  realloc0Impl(p, oldsize, newsize)

proc deallocSharedImpl(p: pointer) = deallocImpl(p)


# Empty stubs for the GC

proc GC_disable() = discard
proc GC_enable() = discard
proc GC_fullCollect() = discard
proc GC_setStrategy(strategy: GC_Strategy) = discard
proc GC_enableMarkAndSweep() = discard
proc GC_disableMarkAndSweep() = discard

proc getOccupiedMem(): int = discard
proc getFreeMem(): int = discard
proc getTotalMem(): int = discard

proc nimGC_setStackBottom(theStackBottom: pointer) = discard

proc initGC() = discard

proc newObjNoInit(typ: PNimType, size: int): pointer =
  result = alloc(size)

proc growObj(old: pointer, newsize: int): pointer =
  result = realloc(old, newsize)

proc nimGCref(p: pointer) {.compilerproc, inline.} = discard
proc nimGCunref(p: pointer) {.compilerproc, inline.} = discard

proc unsureAsgnRef(dest: PPointer, src: pointer) {.compilerproc, inline.} =
  dest[] = src
proc asgnRef(dest: PPointer, src: pointer) {.compilerproc, inline.} =
  dest[] = src
proc asgnRefNoCycle(dest: PPointer, src: pointer) {.compilerproc, inline,
  deprecated: "old compiler compat".} = asgnRef(dest, src)

type
  MemRegion = object

proc alloc(r: var MemRegion, size: int): pointer =
  result = alloc(size)
proc alloc0Impl(r: var MemRegion, size: int): pointer =
  result = alloc0Impl(size)
proc dealloc(r: var MemRegion, p: pointer) = dealloc(p)
proc deallocOsPages(r: var MemRegion) = discard
proc deallocOsPages() = discard