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-- $Id: testes/cstack.lua $
-- See Copyright Notice in file all.lua
print"testing C-stack overflow detection"
-- Segmentation faults in these tests probably result from a C-stack
-- overflow. To avoid these errors, you should set a smaller limit for
-- the use of C stack by Lua, by changing the constant 'LUAI_MAXCCALLS'.
-- Alternatively, you can ensure a larger stack for the program.
local function checkerror (msg, f, ...)
local s, err = pcall(f, ...)
assert(not s and string.find(err, msg))
end
do print("testing stack overflow in message handling")
local count = 0
local function loop (x, y, z)
count = count + 1
return 1 + loop(x, y, z)
end
local res, msg = xpcall(loop, loop)
assert(msg == "error in error handling")
print("final count: ", count)
end
-- bug since 2.5 (C-stack overflow in recursion inside pattern matching)
do print("testing recursion inside pattern matching")
local function f (size)
local s = string.rep("a", size)
local p = string.rep(".?", size)
return string.match(s, p)
end
local m = f(80)
assert(#m == 80)
checkerror("too complex", f, 2000)
end
do print("testing stack-overflow in recursive 'gsub'")
local count = 0
local function foo ()
count = count + 1
string.gsub("a", ".", foo)
end
checkerror("stack overflow", foo)
print("final count: ", count)
print("testing stack-overflow in recursive 'gsub' with metatables")
local count = 0
local t = setmetatable({}, {__index = foo})
foo = function ()
count = count + 1
string.gsub("a", ".", t)
end
checkerror("stack overflow", foo)
print("final count: ", count)
end
do -- bug in 5.4.0
print("testing limits in coroutines inside deep calls")
local count = 0
local lim = 1000
local function stack (n)
if n > 0 then return stack(n - 1) + 1
else coroutine.wrap(function ()
count = count + 1
stack(lim)
end)()
end
end
local st, msg = xpcall(stack, function () return "ok" end, lim)
assert(not st and msg == "ok")
print("final count: ", count)
end
do
print("nesting of resuming yielded coroutines")
local count = 0
local function body ()
coroutine.yield()
local f = coroutine.wrap(body)
f(); -- start new coroutine (will stop in previous yield)
count = count + 1
f() -- call it recursively
end
local f = coroutine.wrap(body)
f()
assert(not pcall(f))
print("final count: ", count)
end
print'OK'
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