luajit and ffi went wrong in while block #8
Description
I develop a red-black tree base on luajit, but sometime could not found the minium node in the tree, The code behind would assert failed.
If add a line to the while block or use jit.off() to disable jit, it would work well.
while node.left ~= sentinel do
--If add a line here, it would work well even jit.on
--print('node:', node)
node = node.left
end
assert(node.left == sentinel)OS: Ubuntu 16.04 or ArchLinux .
Code is Here, extra code is removed.
local ffi = require "ffi"
ffi.cdef[[
typedef struct rbtree_node_s rbtree_node;
struct rbtree_node_s {
int key;
struct rbtree_node_s *left;
};
]]
--for debug
local function traverse(array, size)
for i = 0, size + 1 do
print('i:', i, ' node:', array[i], ' nodekey:', array[i].key, ' node.left:', array[i].left)
end
end
local function test()
local size = 24
local q = ffi.new("rbtree_node[?]", size + 2)
ffi.fill(q, ffi.sizeof("rbtree_node", size + 2), 0)
local sentinel = q[0]
local root = q[1]
root.key = 1
root.left = sentinel
for i = 2, size do
q[i].key = i
q[i-1].left = q[i]
q[i].left = sentinel
local node = root
while node.left ~= sentinel do
--If add a line here, it would work well even jit.on
--print('node:', node)
node = node.left
end
--print('index:', i)
--print('node:', node)
--print('node.key:', node.key)
--print('node.left:', node.left)
--traverse(q, size)
assert(node == q[i])
assert(node.left == sentinel)
end
end
print('jit.off')
jit.off(test)
test()
print('jit.on')
jit.on(test)
test()