Nim OOM Tests

OOM_Heap.nim

type
  FatArray = array[50_000_000, uint8]
  FatArrayRef = ref FatArray

var container: array[50_000_000, FatArrayRef]

var i = 0
while true:
    try:
        # Will eventually return nil
        var x:FatArrayRef = new FatArray
        container[i] = x
        i += 1
        echo i
    except:
        echo getCurrentExceptionMsg()
        let ose = getCurrentException()
        echo ose.name
        break

OOM_Seq.nim

type
    FatArray = array[50_000, uint8]

var container = newSeq[FatArray](1)
var i = 0
while true:
    try:
        #Will eventually hang
        var x:FatArray
        x[0]=5
        container.add(x)
        i += 1
        echo i
    except:
        echo getCurrentExceptionMsg()
        let ose = getCurrentException()
        echo ose.name
        break

OOM_Stack.nim

type
  FatArray = array[50_000_000, uint8]

# Doesn't compile needs a const size
proc fatStack(size:int) =
    var container: array[size, FatArray]
    var i = 0
    
    try:
        var x:FatArray
        container[i] = x
        i += 1
    except:
        echo getCurrentExceptionMsg()
        let ose = getCurrentException()
        echo ose.name

var size = 1
while true:
    try:
        fatStack(size)
        size += 1
        echo size
    except:
        echo getCurrentExceptionMsg()
        let ose = getCurrentException()
        echo ose.name
        break

oomSeq.nim

# From within newSeq:
# SIGSEGV: Illegal storage access. (Attempt to read from nil?)
var container = newSeq[uint64](50_000_000*50_000_000)
container[0] = 5

oomStackArray.nim

# Linker Error: ARM64 ADRP out of range (20000000024576 max is +/-4GB): from _main (0x100006F20) to _gEnv (0x12319CE606F0) in '_main' from @moomStackSafe.nim.cpp.o for architecture arm64
var container: array[50_000*50_000_000, uint64]
container[0] = 5

oomStackRecursive.nim

# Program terminates with error code 1 after 2 iterations
proc fatStack(depth:int) =
    var fatty:array[500_000, uint64]
    try:
        fatty[0] = 1
        echo depth
        if (depth > 0):
            fatStack(depth + 1)
    except:
        echo getCurrentExceptionMsg()
        let ose = getCurrentException()
        echo ose.name

fatStack(1)