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#
#
# Nim's Runtime Library
# (c) Copyright 2017 Nim contributors
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
type
AllocatorFlag* {.pure.} = enum ## flags describing the properties of the allocator
ThreadLocal ## the allocator is thread local only.
ZerosMem ## the allocator always zeros the memory on an allocation
Allocator* = ptr AllocatorObj
AllocatorObj* {.inheritable, compilerproc.} = object
alloc*: proc (a: Allocator; size: int; alignment: int = 8): pointer {.nimcall, raises: [], tags: [].}
dealloc*: proc (a: Allocator; p: pointer; size: int) {.nimcall, raises: [], tags: [].}
realloc*: proc (a: Allocator; p: pointer; oldSize, newSize: int): pointer {.nimcall, raises: [], tags: [].}
deallocAll*: proc (a: Allocator) {.nimcall, raises: [], tags: [].}
flags*: set[AllocatorFlag]
name*: cstring
allocCount: int
deallocCount: int
var
localAllocator {.threadvar.}: Allocator
sharedAllocator: Allocator
allocatorStorage {.threadvar.}: AllocatorObj
when defined(useMalloc) and not defined(nimscript):
import "system/ansi_c"
import "system/memory"
template `+!`(p: pointer, s: int): pointer =
cast[pointer](cast[int](p) +% s)
proc getLocalAllocator*(): Allocator =
result = localAllocator
if result == nil:
result = addr allocatorStorage
result.alloc = proc (a: Allocator; size: int; alignment: int = 8): pointer {.nimcall, raises: [].} =
when defined(useMalloc) and not defined(nimscript):
result = c_malloc(size)
# XXX do we need this?
nimZeroMem(result, size)
else:
result = system.alloc0(size)
inc a.allocCount
result.dealloc = proc (a: Allocator; p: pointer; size: int) {.nimcall, raises: [].} =
when defined(useMalloc) and not defined(nimscript):
c_free(p)
else:
system.dealloc(p)
inc a.deallocCount
result.realloc = proc (a: Allocator; p: pointer; oldSize, newSize: int): pointer {.nimcall, raises: [].} =
when defined(useMalloc) and not defined(nimscript):
result = c_realloc(p, newSize)
else:
result = system.realloc(p, newSize)
nimZeroMem(result +! oldSize, newSize - oldSize)
result.deallocAll = nil
result.flags = {ThreadLocal, ZerosMem}
result.name = "nim_local"
localAllocator = result
proc setLocalAllocator*(a: Allocator) =
localAllocator = a
proc getSharedAllocator*(): Allocator =
result = sharedAllocator
proc setSharedAllocator*(a: Allocator) =
sharedAllocator = a
proc allocCounters*(): (int, int) =
let a = getLocalAllocator()
result = (a.allocCount, a.deallocCount)
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