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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, recompile Lua with a smaller
-- value for the constant 'LUAI_MAXCCALLS' or else 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 -- simple recursion
local count = 0
local function foo ()
count = count + 1
foo()
end
checkerror("stack overflow", foo)
print(" maximum recursion: " .. count)
end
-- bug since 2.5 (C-stack overflow in recursion inside pattern matching)
do
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, 200000)
end
-- testing stack-overflow in recursive 'gsub'
do
local count = 0
local function foo ()
count = count + 1
string.gsub("a", ".", foo)
end
checkerror("stack overflow", foo)
print(" maximum 'gsub' nest (calls): " .. count)
-- can be done with metamethods, too
count = 0
local t = setmetatable({}, {__index = foo})
foo = function ()
count = count + 1
string.gsub("a", ".", t)
end
checkerror("stack overflow", foo)
print(" maximum 'gsub' nest (metamethods): " .. count)
end
print'OK'
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