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ba7da13ec5
* unification of the 'nny' and 'nCcalls' counters;
* external C functions ('lua_CFunction') count more "slots" in
the C stack (to allow for their possible use of buffers)
* added a new test script specific for C-stack overflows. (Most
of those tests were already present, but concentrating them
in a single script easies the task of checking whether
'LUAI_MAXCCALLS' is adequate in a system.)
63 lines
1.4 KiB
Lua
63 lines
1.4 KiB
Lua
-- $Id: testes/cstack.lua $
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-- See Copyright Notice in file all.lua
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print"testing C-stack overflow detection"
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-- Segmentation faults in these tests probably result from a C-stack
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-- overflow. To avoid these errors, recompile Lua with a smaller
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-- value for the constant 'LUAI_MAXCCALLS' or else ensure a larger
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-- stack for the program.
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local function checkerror (msg, f, ...)
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local s, err = pcall(f, ...)
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assert(not s and string.find(err, msg))
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end
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do -- simple recursion
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local count = 0
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local function foo ()
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count = count + 1
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foo()
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end
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checkerror("stack overflow", foo)
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print(" maximum recursion: " .. count)
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end
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-- bug since 2.5 (C-stack overflow in recursion inside pattern matching)
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do
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local function f (size)
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local s = string.rep("a", size)
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local p = string.rep(".?", size)
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return string.match(s, p)
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end
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local m = f(80)
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assert(#m == 80)
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checkerror("too complex", f, 200000)
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end
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-- testing stack-overflow in recursive 'gsub'
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do
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local count = 0
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local function foo ()
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count = count + 1
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string.gsub("a", ".", foo)
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end
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checkerror("stack overflow", foo)
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print(" maximum 'gsub' nest (calls): " .. count)
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-- can be done with metamethods, too
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count = 0
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local t = setmetatable({}, {__index = foo})
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foo = function ()
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count = count + 1
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string.gsub("a", ".", t)
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end
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checkerror("stack overflow", foo)
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print(" maximum 'gsub' nest (metamethods): " .. count)
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end
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print'OK'
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