New test for table rehash

testes/nextvar.lua

@@ -9,6 +9,16 @@ local function checkerror (msg, f, ...)
 end
 
 
+local function check (t, na, nh)
+  if not T then return end
+  local a, h = T.querytab(t)
+  if a ~= na or h ~= nh then
+    print(na, nh, a, h)
+    assert(nil)
+  end
+end
+
+
 local a = {}
 
 -- make sure table has lots of space in hash part
@@ -20,6 +30,25 @@ for i=1,100 do
   assert(#a == i)
 end
 
+
+do   -- rehash moving elements from array to hash
+  local a = {}
+  for i = 1, 100 do a[i] = i end
+  check(a, 128, 0)
+
+  for i = 5, 95 do a[i] = nil end
+  check(a, 128, 0)
+
+  a.x = 1     -- force a re-hash
+  check(a, 4, 8)
+
+  for i = 1, 4 do assert(a[i] == i) end
+  for i = 5, 95 do assert(a[i] == nil) end
+  for i = 96, 100 do assert(a[i] == i) end
+  assert(a.x == 1)
+end
+
+
 -- testing ipairs
 local x = 0
 for k,v in ipairs{10,20,30;x=12} do
@@ -65,15 +94,6 @@ local function mp2 (n)   -- minimum power of 2 >= n
 end
 
 
-local function check (t, na, nh)
-  local a, h = T.querytab(t)
-  if a ~= na or h ~= nh then
-    print(na, nh, a, h)
-    assert(nil)
-  end
-end
-
-
 -- testing C library sizes
 do
   local s = 0