[bugfix] fix #11588, don't check if SharedTable is initialized

lib/pure/collections/sharedtables.nim

@@ -19,7 +19,7 @@ include "system/inclrtl"
 
 type
   KeyValuePair[A, B] = tuple[hcode: Hash, key: A, val: B]
-  KeyValuePairSeq[A, B] = ptr array[10_000_000, KeyValuePair[A, B]]
+  KeyValuePairSeq[A, B] = ptr UncheckedArray[KeyValuePair[A, B]]
   SharedTable* [A, B] = object ## generic hash SharedTable
     data: KeyValuePairSeq[A, B]
     counter, dataLen: int
@@ -205,6 +205,8 @@ proc del*[A, B](t: var SharedTable[A, B], key: A) =
 proc init*[A, B](t: var SharedTable[A, B], initialSize=64) =
   ## creates a new hash table that is empty.
   ##
+  ## This proc must be called before any other usage of `t`.
+  ##
   ## `initialSize` needs to be a power of two. If you need to accept runtime
   ## values for this you could use the ``nextPowerOfTwo`` proc from the
   ## `math <math.html>`_ module or the ``rightSize`` proc from this module.

lib/pure/collections/tableimpl.nim

@@ -30,9 +30,13 @@ proc rawInsert[X, A, B](t: var X, data: var KeyValuePairSeq[A, B],
                      key: A, val: B, hc: Hash, h: Hash) =
   rawInsertImpl()
 
+template checkIfInitialized() =
+  when compiles(defaultInitialSize):
+    if t.dataLen == 0:
+      initImpl(t, defaultInitialSize)
+
 template addImpl(enlarge) {.dirty.} =
-  if t.dataLen == 0:
-    initImpl(t, defaultInitialSize)
+  checkIfInitialized()
   if mustRehash(t.dataLen, t.counter): enlarge(t)
   var hc: Hash
   var j = rawGetDeep(t, key, hc)
@@ -40,8 +44,7 @@ template addImpl(enlarge) {.dirty.} =
   inc(t.counter)
 
 template maybeRehashPutImpl(enlarge) {.dirty.} =
-  if t.dataLen == 0:
-    initImpl(t, defaultInitialSize)
+  checkIfInitialized()
   if mustRehash(t.dataLen, t.counter):
     enlarge(t)
     index = rawGetKnownHC(t, key, hc)
@@ -50,16 +53,14 @@ template maybeRehashPutImpl(enlarge) {.dirty.} =
   inc(t.counter)
 
 template putImpl(enlarge) {.dirty.} =
-  if t.dataLen == 0:
-    initImpl(t, defaultInitialSize)
+  checkIfInitialized()
   var hc: Hash
   var index = rawGet(t, key, hc)
   if index >= 0: t.data[index].val = val
   else: maybeRehashPutImpl(enlarge)
 
 template mgetOrPutImpl(enlarge) {.dirty.} =
-  if t.dataLen == 0:
-    initImpl(t, defaultInitialSize)
+  checkIfInitialized()
   var hc: Hash
   var index = rawGet(t, key, hc)
   if index < 0:
@@ -69,8 +70,7 @@ template mgetOrPutImpl(enlarge) {.dirty.} =
   result = t.data[index].val
 
 template hasKeyOrPutImpl(enlarge) {.dirty.} =
-  if t.dataLen == 0:
-    initImpl(t, defaultInitialSize)
+  checkIfInitialized()
   var hc: Hash
   var index = rawGet(t, key, hc)
   if index < 0:

tests/stdlib/tsharedtable.nim

@@ -0,0 +1,14 @@
+discard """
+output: '''
+'''
+"""
+
+import sharedtables
+
+var table: SharedTable[int, int]
+
+init(table)
+table[1] = 10
+assert table.mget(1) == 10
+assert table.mgetOrPut(3, 7) == 7
+assert table.mgetOrPut(3, 99) == 7