Fix cuda on 2.2 (#678)

* new destroy hook form for cuda tensor pointers

* new form for hook for unified memory as well

* remove bad form of error throwing on destructors. worst case we'll leak.

* nim 1.x.x compat

* move destructor hooks to match #676

Author: lilkeet

Diff for: src/arraymancer/tensor/backend/cuda.nim

@@ -33,7 +33,7 @@ proc cudaMalloc*[T](size: Natural): ptr UncheckedArray[T] {.noSideEffect, inline
 
 proc newCudaStorage*[T: SomeFloat](length: int): CudaStorage[T] {.noSideEffect.}=
   result.Flen = length
-  new(result.Fref_tracking, deallocCuda)
+  new result.Fref_tracking
   result.Fdata = cast[ptr UncheckedArray[T]](cudaMalloc[T](result.Flen))
   result.Fref_tracking.value = result.Fdata
 
@@ -88,9 +88,16 @@ type
     len*: cint                # Number of elements allocated in memory
 
 
-proc deallocCuda*(p: CudaLayoutArray) {.noSideEffect.}=
-  if not p.value.isNil:
-    check cudaFree(p.value)
+when NimMajor == 1:
+  proc `=destroy`*(p: var CudaLayoutArrayObj) {.noSideEffect.}=
+    if not p.value.isNil:
+      discard cudaFree(p.value)
+else:
+  proc `=destroy`*(p: CudaLayoutArrayObj) {.noSideEffect.}=
+    if not p.value.isNil:
+      discard cudaFree(p.value)
+
+
 
 proc layoutOnDevice*[T:SomeFloat](t: CudaTensor[T]): CudaTensorLayout[T] {.noSideEffect.}=
   ## Store a CudaTensor shape, strides, etc information on the GPU
@@ -104,8 +111,8 @@ proc layoutOnDevice*[T:SomeFloat](t: CudaTensor[T]): CudaTensorLayout[T] {.noSid
   result.data = t.get_data_ptr
   result.len = t.size.cint
 
-  new result.shape, deallocCuda
-  new result.strides, deallocCuda
+  new result.shape
+  new result.strides
 
   result.shape.value = cudaMalloc[cint](MAXRANK)
   result.strides.value = cudaMalloc[cint](MAXRANK)

Diff for: src/arraymancer/tensor/data_structure.nim

@@ -57,9 +57,14 @@ when defined(cuda):
       offset*: int
       storage*: CudaStorage[T]
 
-  proc deallocCuda*[T](p: CudaTensorRefTracker[T]) {.noSideEffect.}=
-    if not p.value.isNil:
-      check cudaFree(p.value)
+  when NimMajor == 1:
+    proc `=destroy`*[T](p: var CudaTensorRefTrackerObj[T]) {.noSideEffect.}=
+      if not p.value.isNil:
+        discard cudaFree(p.value)
+  else:
+    proc `=destroy`*[T](p: CudaTensorRefTrackerObj[T]) {.noSideEffect.}=
+      if not p.value.isNil:
+        discard cudaFree(p.value)
 
 when defined(opencl):
   type
@@ -98,7 +103,6 @@ type GpuTensor[T] = AnyTensor[T] and not Tensor[T]
 
 
 
-
 # ###############
 # Field accessors
 # ###############