Cleaned up mmdisp.nim, moved implementations into lib/system/mm/ (#13254)

1 files changed, 152 insertions, 0 deletions

diff --git a/lib/system/mm/go.nim b/lib/system/mm/go.nim
new file mode 100644
index 000000000..8e8558bea
--- /dev/null
+++ b/lib/system/mm/go.nim
@@ -0,0 +1,152 @@
+
+when defined(windows):
+  const goLib = "libgo.dll"
+elif defined(macosx):
+  const goLib = "libgo.dylib"
+else:
+  const goLib = "libgo.so"
+
+proc initGC() = discard
+proc GC_disable() = discard
+proc GC_enable() = discard
+proc go_gc() {.importc: "go_gc", dynlib: goLib.}
+proc GC_fullCollect() = go_gc()
+proc GC_setStrategy(strategy: GC_Strategy) = discard
+proc GC_enableMarkAndSweep() = discard
+proc GC_disableMarkAndSweep() = discard
+
+const
+  goNumSizeClasses = 67
+
+type
+  goMStats = object
+    alloc: uint64          # bytes allocated and still in use
+    total_alloc: uint64    # bytes allocated (even if freed)
+    sys: uint64            # bytes obtained from system
+    nlookup: uint64        # number of pointer lookups
+    nmalloc: uint64        # number of mallocs
+    nfree: uint64          # number of frees
+    heap_objects: uint64   # total number of allocated objects
+    pause_total_ns: uint64 # cumulative nanoseconds in GC stop-the-world pauses since the program started
+    numgc: uint32          # number of completed GC cycles
+
+proc goMemStats(): goMStats {.importc: "go_mem_stats", dynlib: goLib.}
+proc goMalloc(size: uint): pointer {.importc: "go_malloc", dynlib: goLib.}
+proc goSetFinalizer(obj: pointer, f: pointer) {.importc: "set_finalizer", codegenDecl:"$1 $2$3 __asm__ (\"main.Set_finalizer\");\n$1 $2$3", dynlib: goLib.}
+proc writebarrierptr(dest: PPointer, src: pointer) {.importc: "writebarrierptr", codegenDecl:"$1 $2$3 __asm__ (\"main.Atomic_store_pointer\");\n$1 $2$3", dynlib: goLib.}
+
+proc `$`*(x: uint64): string {.noSideEffect, raises: [].}
+
+proc GC_getStatistics(): string =
+  var mstats = goMemStats()
+  result = "[GC] total allocated memory: " & $(mstats.total_alloc) & "\n" &
+           "[GC] total memory obtained from system: " & $(mstats.sys) & "\n" &
+           "[GC] occupied memory: " & $(mstats.alloc) & "\n" &
+           "[GC] number of pointer lookups: " & $(mstats.nlookup) & "\n" &
+           "[GC] number of mallocs: " & $(mstats.nmalloc) & "\n" &
+           "[GC] number of frees: " & $(mstats.nfree) & "\n" &
+           "[GC] heap objects: " & $(mstats.heap_objects) & "\n" &
+           "[GC] number of completed GC cycles: " & $(mstats.numgc) & "\n" &
+           "[GC] total GC pause time [ms]: " & $(mstats.pause_total_ns div 1000_000)
+
+proc getOccupiedMem(): int =
+  var mstats = goMemStats()
+  result = int(mstats.alloc)
+
+proc getFreeMem(): int =
+  var mstats = goMemStats()
+  result = int(mstats.sys - mstats.alloc)
+
+proc getTotalMem(): int =
+  var mstats = goMemStats()
+  result = int(mstats.sys)
+
+proc nimGC_setStackBottom(theStackBottom: pointer) = discard
+
+proc allocImpl(size: Natural): pointer =
+  result = goMalloc(size.uint)
+
+proc alloc0Impl(size: Natural): pointer =
+  result = goMalloc(size.uint)
+
+proc reallocImpl(p: pointer, newsize: Natural): pointer =
+  doAssert false, "not implemented"
+
+proc realloc0Impl(p: pointer, oldsize, newsize: Natural): pointer =
+  doAssert false, "not implemented"
+
+proc deallocImpl(p: pointer) =
+  discard
+
+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)
+
+when hasThreadSupport:
+  proc getFreeSharedMem(): int = discard
+  proc getTotalSharedMem(): int = discard
+  proc getOccupiedSharedMem(): int = discard
+
+proc newObj(typ: PNimType, size: int): pointer {.compilerproc.} =
+  writebarrierptr(addr(result), goMalloc(size.uint))
+  if typ.finalizer != nil:
+    goSetFinalizer(result, typ.finalizer)
+
+proc newObjRC1(typ: PNimType, size: int): pointer {.compilerRtl.} =
+  writebarrierptr(addr(result), newObj(typ, size))
+
+proc newObjNoInit(typ: PNimType, size: int): pointer =
+  writebarrierptr(addr(result), newObj(typ, size))
+
+proc newSeq(typ: PNimType, len: int): pointer {.compilerproc.} =
+  writebarrierptr(addr(result), newObj(typ, len * typ.base.size + GenericSeqSize))
+  cast[PGenericSeq](result).len = len
+  cast[PGenericSeq](result).reserved = len
+  cast[PGenericSeq](result).elemSize = typ.base.size
+
+proc newSeqRC1(typ: PNimType, len: int): pointer {.compilerRtl.} =
+  writebarrierptr(addr(result), newSeq(typ, len))
+
+proc nimNewSeqOfCap(typ: PNimType, cap: int): pointer {.compilerproc.} =
+  result = newObj(typ, cap * typ.base.size + GenericSeqSize)
+  cast[PGenericSeq](result).len = 0
+  cast[PGenericSeq](result).reserved = cap
+  cast[PGenericSeq](result).elemSize = typ.base.size
+
+proc typedMemMove(dest: pointer, src: pointer, size: uint) {.importc: "typedmemmove", dynlib: goLib.}
+
+proc growObj(old: pointer, newsize: int): pointer =
+  # the Go GC doesn't have a realloc
+  var metadataOld = cast[PGenericSeq](old)
+  if metadataOld.elemSize == 0:
+    metadataOld.elemSize = 1
+  let oldsize = cast[PGenericSeq](old).len * cast[PGenericSeq](old).elemSize + GenericSeqSize
+  writebarrierptr(addr(result), goMalloc(newsize.uint))
+  typedMemMove(result, old, oldsize.uint)
+
+proc nimGCref(p: pointer) {.compilerproc, inline.} = discard
+proc nimGCunref(p: pointer) {.compilerproc, inline.} = discard
+proc nimGCunrefNoCycle(p: pointer) {.compilerProc, inline.} = discard
+proc nimGCunrefRC1(p: pointer) {.compilerProc, inline.} = discard
+proc nimGCvisit(d: pointer, op: int) {.compilerRtl.} = discard
+
+proc unsureAsgnRef(dest: PPointer, src: pointer) {.compilerproc, inline.} =
+  writebarrierptr(dest, src)
+proc asgnRef(dest: PPointer, src: pointer) {.compilerproc, inline.} =
+  writebarrierptr(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 alloc0(r: var MemRegion, size: int): pointer =
+  result = alloc0Impl(size)
+proc dealloc(r: var MemRegion, p: pointer) = dealloc(p)
+proc deallocOsPages(r: var MemRegion) {.inline.} = discard
+proc deallocOsPages() {.inline.} = discard
+