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1-- $Id: errors.lua,v 1.94 2016/12/21 19:23:02 roberto Exp $
2-- See Copyright Notice in file all.lua
3
4print("testing errors")
5
6local debug = require"debug"
7
8-- avoid problems with 'strict' module (which may generate other error messages)
9local mt = getmetatable(_G) or {}
10local oldmm = mt.__index
11mt.__index = nil
12
13local function checkerr (msg, f, ...)
14 local st, err = pcall(f, ...)
15 assert(not st and string.find(err, msg))
16end
17
18
19local function doit (s)
20 local f, msg = load(s)
21 if f == nil then return msg end
22 local cond, msg = pcall(f)
23 return (not cond) and msg
24end
25
26
27local function checkmessage (prog, msg)
28 local m = doit(prog)
29 assert(string.find(m, msg, 1, true))
30end
31
32local function checksyntax (prog, extra, token, line)
33 local msg = doit(prog)
34 if not string.find(token, "^<%a") and not string.find(token, "^char%(")
35 then token = "'"..token.."'" end
36 token = string.gsub(token, "(%p)", "%%%1")
37 local pt = string.format([[^%%[string ".*"%%]:%d: .- near %s$]],
38 line, token)
39 assert(string.find(msg, pt))
40 assert(string.find(msg, msg, 1, true))
41end
42
43
44-- test error message with no extra info
45assert(doit("error('hi', 0)") == 'hi')
46
47-- test error message with no info
48assert(doit("error()") == nil)
49
50
51-- test common errors/errors that crashed in the past
52assert(doit("table.unpack({}, 1, n=2^30)"))
53assert(doit("a=math.sin()"))
54assert(not doit("tostring(1)") and doit("tostring()"))
55assert(doit"tonumber()")
56assert(doit"repeat until 1; a")
57assert(doit"return;;")
58assert(doit"assert(false)")
59assert(doit"assert(nil)")
60assert(doit("function a (... , ...) end"))
61assert(doit("function a (, ...) end"))
62assert(doit("local t={}; t = t[#t] + 1"))
63
64checksyntax([[
65 local a = {4
66
67]], "'}' expected (to close '{' at line 1)", "<eof>", 3)
68
69
70-- tests for better error messages
71
72checkmessage("a = {} + 1", "arithmetic")
73checkmessage("a = {} | 1", "bitwise operation")
74checkmessage("a = {} < 1", "attempt to compare")
75checkmessage("a = {} <= 1", "attempt to compare")
76
77checkmessage("a=1; bbbb=2; a=math.sin(3)+bbbb(3)", "global 'bbbb'")
78checkmessage("a={}; do local a=1 end a:bbbb(3)", "method 'bbbb'")
79checkmessage("local a={}; a.bbbb(3)", "field 'bbbb'")
80assert(not string.find(doit"a={13}; local bbbb=1; a[bbbb](3)", "'bbbb'"))
81checkmessage("a={13}; local bbbb=1; a[bbbb](3)", "number")
82checkmessage("a=(1)..{}", "a table value")
83
84checkmessage("a = #print", "length of a function value")
85checkmessage("a = #3", "length of a number value")
86
87aaa = nil
88checkmessage("aaa.bbb:ddd(9)", "global 'aaa'")
89checkmessage("local aaa={bbb=1}; aaa.bbb:ddd(9)", "field 'bbb'")
90checkmessage("local aaa={bbb={}}; aaa.bbb:ddd(9)", "method 'ddd'")
91checkmessage("local a,b,c; (function () a = b+1 end)()", "upvalue 'b'")
92assert(not doit"local aaa={bbb={ddd=next}}; aaa.bbb:ddd(nil)")
93
94-- upvalues being indexed do not go to the stack
95checkmessage("local a,b,cc; (function () a = cc[1] end)()", "upvalue 'cc'")
96checkmessage("local a,b,cc; (function () a.x = 1 end)()", "upvalue 'a'")
97
98checkmessage("local _ENV = {x={}}; a = a + 1", "global 'a'")
99
100checkmessage("b=1; local aaa='a'; x=aaa+b", "local 'aaa'")
101checkmessage("aaa={}; x=3/aaa", "global 'aaa'")
102checkmessage("aaa='2'; b=nil;x=aaa*b", "global 'b'")
103checkmessage("aaa={}; x=-aaa", "global 'aaa'")
104
105-- short circuit
106checkmessage("a=1; local a,bbbb=2,3; a = math.sin(1) and bbbb(3)",
107 "local 'bbbb'")
108checkmessage("a=1; local a,bbbb=2,3; a = bbbb(1) or a(3)", "local 'bbbb'")
109checkmessage("local a,b,c,f = 1,1,1; f((a and b) or c)", "local 'f'")
110checkmessage("local a,b,c = 1,1,1; ((a and b) or c)()", "call a number value")
111assert(not string.find(doit"aaa={}; x=(aaa or aaa)+(aaa and aaa)", "'aaa'"))
112assert(not string.find(doit"aaa={}; (aaa or aaa)()", "'aaa'"))
113
114checkmessage("print(print < 10)", "function with number")
115checkmessage("print(print < print)", "two function values")
116checkmessage("print('10' < 10)", "string with number")
117checkmessage("print(10 < '23')", "number with string")
118
119-- float->integer conversions
120checkmessage("local a = 2.0^100; x = a << 2", "local a")
121checkmessage("local a = 1 >> 2.0^100", "has no integer representation")
122checkmessage("local a = '10' << 2.0^100", "has no integer representation")
123checkmessage("local a = 2.0^100 & 1", "has no integer representation")
124checkmessage("local a = 2.0^100 & '1'", "has no integer representation")
125checkmessage("local a = 2.0 | 1e40", "has no integer representation")
126checkmessage("local a = 2e100 ~ 1", "has no integer representation")
127checkmessage("string.sub('a', 2.0^100)", "has no integer representation")
128checkmessage("string.rep('a', 3.3)", "has no integer representation")
129checkmessage("return 6e40 & 7", "has no integer representation")
130checkmessage("return 34 << 7e30", "has no integer representation")
131checkmessage("return ~-3e40", "has no integer representation")
132checkmessage("return ~-3.009", "has no integer representation")
133checkmessage("return 3.009 & 1", "has no integer representation")
134checkmessage("return 34 >> {}", "table value")
135checkmessage("a = 24 // 0", "divide by zero")
136checkmessage("a = 1 % 0", "'n%0'")
137
138
139-- passing light userdata instead of full userdata
140_G.D = debug
141checkmessage([[
142 -- create light udata
143 local x = D.upvalueid(function () return debug end, 1)
144 D.setuservalue(x, {})
145]], "light userdata")
146_G.D = nil
147
148do -- named objects (field '__name')
149 checkmessage("math.sin(io.input())", "(number expected, got FILE*)")
150 _G.XX = setmetatable({}, {__name = "My Type"})
151 assert(string.find(tostring(XX), "^My Type"))
152 checkmessage("io.input(XX)", "(FILE* expected, got My Type)")
153 checkmessage("return XX + 1", "on a My Type value")
154 checkmessage("return ~io.stdin", "on a FILE* value")
155 checkmessage("return XX < XX", "two My Type values")
156 checkmessage("return {} < XX", "table with My Type")
157 checkmessage("return XX < io.stdin", "My Type with FILE*")
158 _G.XX = nil
159end
160
161-- global functions
162checkmessage("(io.write or print){}", "io.write")
163checkmessage("(collectgarbage or print){}", "collectgarbage")
164
165-- errors in functions without debug info
166do
167 local f = function (a) return a + 1 end
168 f = assert(load(string.dump(f, true)))
169 assert(f(3) == 4)
170 checkerr("^%?:%-1:", f, {})
171
172 -- code with a move to a local var ('OP_MOV A B' with A<B)
173 f = function () local a; a = {}; return a + 2 end
174 -- no debug info (so that 'a' is unknown)
175 f = assert(load(string.dump(f, true)))
176 -- symbolic execution should not get lost
177 checkerr("^%?:%-1:.*table value", f)
178end
179
180
181-- tests for field accesses after RK limit
182local t = {}
183for i = 1, 1000 do
184 t[i] = "a = x" .. i
185end
186local s = table.concat(t, "; ")
187t = nil
188checkmessage(s.."; a = bbb + 1", "global 'bbb'")
189checkmessage("local _ENV=_ENV;"..s.."; a = bbb + 1", "global 'bbb'")
190checkmessage(s.."; local t = {}; a = t.bbb + 1", "field 'bbb'")
191checkmessage(s.."; local t = {}; t:bbb()", "method 'bbb'")
192
193checkmessage([[aaa=9
194repeat until 3==3
195local x=math.sin(math.cos(3))
196if math.sin(1) == x then return math.sin(1) end -- tail call
197local a,b = 1, {
198 {x='a'..'b'..'c', y='b', z=x},
199 {1,2,3,4,5} or 3+3<=3+3,
200 3+1>3+1,
201 {d = x and aaa[x or y]}}
202]], "global 'aaa'")
203
204checkmessage([[
205local x,y = {},1
206if math.sin(1) == 0 then return 3 end -- return
207x.a()]], "field 'a'")
208
209checkmessage([[
210prefix = nil
211insert = nil
212while 1 do
213 local a
214 if nil then break end
215 insert(prefix, a)
216end]], "global 'insert'")
217
218checkmessage([[ -- tail call
219 return math.sin("a")
220]], "'sin'")
221
222checkmessage([[collectgarbage("nooption")]], "invalid option")
223
224checkmessage([[x = print .. "a"]], "concatenate")
225checkmessage([[x = "a" .. false]], "concatenate")
226checkmessage([[x = {} .. 2]], "concatenate")
227
228checkmessage("getmetatable(io.stdin).__gc()", "no value")
229
230checkmessage([[
231local Var
232local function main()
233 NoSuchName (function() Var=0 end)
234end
235main()
236]], "global 'NoSuchName'")
237print'+'
238
239a = {}; setmetatable(a, {__index = string})
240checkmessage("a:sub()", "bad self")
241checkmessage("string.sub('a', {})", "#2")
242checkmessage("('a'):sub{}", "#1")
243
244checkmessage("table.sort({1,2,3}, table.sort)", "'table.sort'")
245checkmessage("string.gsub('s', 's', setmetatable)", "'setmetatable'")
246
247-- tests for errors in coroutines
248
249local function f (n)
250 local c = coroutine.create(f)
251 local a,b = coroutine.resume(c)
252 return b
253end
254assert(string.find(f(), "C stack overflow"))
255
256checkmessage("coroutine.yield()", "outside a coroutine")
257
258f = coroutine.wrap(function () table.sort({1,2,3}, coroutine.yield) end)
259checkerr("yield across", f)
260
261
262-- testing size of 'source' info; size of buffer for that info is
263-- LUA_IDSIZE, declared as 60 in luaconf. Get one position for '\0'.
264idsize = 60 - 1
265local function checksize (source)
266 -- syntax error
267 local _, msg = load("x", source)
268 msg = string.match(msg, "^([^:]*):") -- get source (1st part before ':')
269 assert(msg:len() <= idsize)
270end
271
272for i = 60 - 10, 60 + 10 do -- check border cases around 60
273 checksize("@" .. string.rep("x", i)) -- file names
274 checksize(string.rep("x", i - 10)) -- string sources
275 checksize("=" .. string.rep("x", i)) -- exact sources
276end
277
278
279-- testing line error
280
281local function lineerror (s, l)
282 local err,msg = pcall(load(s))
283 local line = string.match(msg, ":(%d+):")
284 assert((line and line+0) == l)
285end
286
287lineerror("local a\n for i=1,'a' do \n print(i) \n end", 2)
288lineerror("\n local a \n for k,v in 3 \n do \n print(k) \n end", 3)
289lineerror("\n\n for k,v in \n 3 \n do \n print(k) \n end", 4)
290lineerror("function a.x.y ()\na=a+1\nend", 1)
291
292lineerror("a = \na\n+\n{}", 3)
293lineerror("a = \n3\n+\n(\n4\n/\nprint)", 6)
294lineerror("a = \nprint\n+\n(\n4\n/\n7)", 3)
295
296lineerror("a\n=\n-\n\nprint\n;", 3)
297
298lineerror([[
299a
300(
30123)
302]], 1)
303
304lineerror([[
305local a = {x = 13}
306a
307.
308x
309(
31023
311)
312]], 2)
313
314lineerror([[
315local a = {x = 13}
316a
317.
318x
319(
32023 + a
321)
322]], 6)
323
324local p = [[
325 function g() f() end
326 function f(x) error('a', X) end
327g()
328]]
329X=3;lineerror((p), 3)
330X=0;lineerror((p), nil)
331X=1;lineerror((p), 2)
332X=2;lineerror((p), 1)
333
334
335if not _soft then
336 -- several tests that exaust the Lua stack
337 collectgarbage()
338 print"testing stack overflow"
339 C = 0
340 local l = debug.getinfo(1, "l").currentline; function y () C=C+1; y() end
341
342 local function checkstackmessage (m)
343 return (string.find(m, "^.-:%d+: stack overflow"))
344 end
345 -- repeated stack overflows (to check stack recovery)
346 assert(checkstackmessage(doit('y()')))
347 print('+')
348 assert(checkstackmessage(doit('y()')))
349 print('+')
350 assert(checkstackmessage(doit('y()')))
351 print('+')
352
353
354 -- error lines in stack overflow
355 C = 0
356 local l1
357 local function g(x)
358 l1 = debug.getinfo(x, "l").currentline; y()
359 end
360 local _, stackmsg = xpcall(g, debug.traceback, 1)
361 print('+')
362 local stack = {}
363 for line in string.gmatch(stackmsg, "[^\n]*") do
364 local curr = string.match(line, ":(%d+):")
365 if curr then table.insert(stack, tonumber(curr)) end
366 end
367 local i=1
368 while stack[i] ~= l1 do
369 assert(stack[i] == l)
370 i = i+1
371 end
372 assert(i > 15)
373
374
375 -- error in error handling
376 local res, msg = xpcall(error, error)
377 assert(not res and type(msg) == 'string')
378 print('+')
379
380 local function f (x)
381 if x==0 then error('a\n')
382 else
383 local aux = function () return f(x-1) end
384 local a,b = xpcall(aux, aux)
385 return a,b
386 end
387 end
388 f(3)
389
390 local function loop (x,y,z) return 1 + loop(x, y, z) end
391
392 local res, msg = xpcall(loop, function (m)
393 assert(string.find(m, "stack overflow"))
394 checkerr("error handling", loop)
395 assert(math.sin(0) == 0)
396 return 15
397 end)
398 assert(msg == 15)
399
400 local f = function ()
401 for i = 999900, 1000000, 1 do table.unpack({}, 1, i) end
402 end
403 checkerr("too many results", f)
404
405end
406
407
408do
409 -- non string messages
410 local t = {}
411 local res, msg = pcall(function () error(t) end)
412 assert(not res and msg == t)
413
414 res, msg = pcall(function () error(nil) end)
415 assert(not res and msg == nil)
416
417 local function f() error{msg='x'} end
418 res, msg = xpcall(f, function (r) return {msg=r.msg..'y'} end)
419 assert(msg.msg == 'xy')
420
421 -- 'assert' with extra arguments
422 res, msg = pcall(assert, false, "X", t)
423 assert(not res and msg == "X")
424
425 -- 'assert' with no message
426 res, msg = pcall(function () assert(false) end)
427 local line = string.match(msg, "%w+%.lua:(%d+): assertion failed!$")
428 assert(tonumber(line) == debug.getinfo(1, "l").currentline - 2)
429
430 -- 'assert' with non-string messages
431 res, msg = pcall(assert, false, t)
432 assert(not res and msg == t)
433
434 res, msg = pcall(assert, nil, nil)
435 assert(not res and msg == nil)
436
437 -- 'assert' without arguments
438 res, msg = pcall(assert)
439 assert(not res and string.find(msg, "value expected"))
440end
441
442-- xpcall with arguments
443a, b, c = xpcall(string.find, error, "alo", "al")
444assert(a and b == 1 and c == 2)
445a, b, c = xpcall(string.find, function (x) return {} end, true, "al")
446assert(not a and type(b) == "table" and c == nil)
447
448
449print("testing tokens in error messages")
450checksyntax("syntax error", "", "error", 1)
451checksyntax("1.000", "", "1.000", 1)
452checksyntax("[[a]]", "", "[[a]]", 1)
453checksyntax("'aa'", "", "'aa'", 1)
454checksyntax("while << do end", "", "<<", 1)
455checksyntax("for >> do end", "", ">>", 1)
456
457-- test invalid non-printable char in a chunk
458checksyntax("a\1a = 1", "", "<\\1>", 1)
459
460-- test 255 as first char in a chunk
461checksyntax("\255a = 1", "", "<\\255>", 1)
462
463doit('I = load("a=9+"); a=3')
464assert(a==3 and I == nil)
465print('+')
466
467lim = 1000
468if _soft then lim = 100 end
469for i=1,lim do
470 doit('a = ')
471 doit('a = 4+nil')
472end
473
474
475-- testing syntax limits
476
477local maxClevel = 200 -- LUAI_MAXCCALLS (in llimits.h)
478
479local function testrep (init, rep, close, repc)
480 local s = init .. string.rep(rep, maxClevel - 10) .. close ..
481 string.rep(repc, maxClevel - 10)
482 assert(load(s)) -- 190 levels is OK
483 s = init .. string.rep(rep, maxClevel + 1)
484 checkmessage(s, "too many C levels")
485end
486
487testrep("local a; a", ",a", "= 1", ",1") -- multiple assignment
488testrep("local a; a=", "{", "0", "}")
489testrep("local a; a=", "(", "2", ")")
490testrep("local a; ", "a(", "2", ")")
491testrep("", "do ", "", " end")
492testrep("", "while a do ", "", " end")
493testrep("local a; ", "if a then else ", "", " end")
494testrep("", "function foo () ", "", " end")
495testrep("local a; a=", "a..", "a", "")
496testrep("local a; a=", "a^", "a", "")
497
498checkmessage("a = f(x" .. string.rep(",x", 260) .. ")", "too many registers")
499
500
501-- testing other limits
502
503-- upvalues
504local lim = 127
505local s = "local function fooA ()\n local "
506for j = 1,lim do
507 s = s.."a"..j..", "
508end
509s = s.."b,c\n"
510s = s.."local function fooB ()\n local "
511for j = 1,lim do
512 s = s.."b"..j..", "
513end
514s = s.."b\n"
515s = s.."function fooC () return b+c"
516local c = 1+2
517for j = 1,lim do
518 s = s.."+a"..j.."+b"..j
519 c = c + 2
520end
521s = s.."\nend end end"
522local a,b = load(s)
523assert(c > 255 and string.find(b, "too many upvalues") and
524 string.find(b, "line 5"))
525
526-- local variables
527s = "\nfunction foo ()\n local "
528for j = 1,300 do
529 s = s.."a"..j..", "
530end
531s = s.."b\n"
532local a,b = load(s)
533assert(string.find(b, "line 2") and string.find(b, "too many local variables"))
534
535mt.__index = oldmm
536
537print('OK')