[bugfix] fix nim-lang#11588, initialize SharedTable

lib/pure/collections/tableimpl.nim

@@ -30,18 +30,23 @@ proc rawInsert[X, A, B](t: var X, data: var KeyValuePairSeq[A, B],
                      key: A, val: B, hc: Hash, h: Hash) =
   rawInsertImpl()
 
-template addImpl(enlarge) {.dirty.} =
+template checkIfInitialized() =
   if t.dataLen == 0:
-    initImpl(t, defaultInitialSize)
+    when compiles(defaultInitialSize):
+      initImpl(t, defaultInitialSize)
+    else: # SharedTable
+      init(t)
+
+template addImpl(enlarge) {.dirty.} =
+  checkIfInitialized()
   if mustRehash(t.dataLen, t.counter): enlarge(t)
   var hc: Hash
   var j = rawGetDeep(t, key, hc)
   rawInsert(t, t.data, key, val, hc, j)
   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 +55,14 @@ 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 +72,7 @@ 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 +1,33 @@
+discard """
+output: '''
+'''
+"""
+
+import sharedtables
+
+block:
+  var
+    table1: SharedTable[int, int]
+    table2: SharedTable[int, int]
+
+  init(table1)
+  table1[1] = 10
+  assert table1.mget(1) == 10
+
+  # without init
+  table2[5] = 15
+  assert table2.mget(5) == 15
+
+
+block:
+  var
+    table1: SharedTable[int, int]
+    table2: SharedTable[int, int]
+
+  init(table1)
+  assert table1.mgetOrPut(1, 7) == 7
+  assert table1.mgetOrPut(1, 99) == 7
+
+  # without init
+  assert table2.mgetOrPut(1, 7) == 7
+  assert table2.mgetOrPut(1, 99) == 7