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A return can have at most 254 values

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This commit is contained in:
Roberto Ierusalimschy 2024-08-19 18:39:25 -03:00
parent 8b752ddf14
commit 3e88b72b8e
2 changed files with 13 additions and 0 deletions
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2
lcode.c
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@ -208,6 +208,8 @@ void luaK_ret (FuncState *fs, int first, int nret) {
case 1: op = OP_RETURN1; break; case 1: op = OP_RETURN1; break;
default: op = OP_RETURN; break; default: op = OP_RETURN; break;
} }
if (nret + 1 > MAXARG_B)
luaX_syntaxerror(fs->ls, "too many returns");
luaK_codeABC(fs, op, first, nret + 1, 0); luaK_codeABC(fs, op, first, nret + 1, 0);
} }

11
testes/calls.lua
View File

@ -518,5 +518,16 @@ do -- check reuse of strings in dumps
end end
end end
do -- test limit of multiple returns (254 values)
local code = "return 10" .. string.rep(",10", 253)
local res = {assert(load(code))()}
assert(#res == 254 and res[254] == 10)
code = code .. ",10"
local status, msg = load(code)
assert(not status and string.find(msg, "too many returns"))
end
print('OK') print('OK')
return deep return deep