mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
19 lines
755 B
Solidity
19 lines
755 B
Solidity
pragma experimental SMTChecker;
|
|
|
|
contract C {
|
|
function f(int a, int b) public pure returns (int) {
|
|
return a % b; // can div by 0
|
|
}
|
|
function g(bool _check) public pure returns (int) {
|
|
int x = type(int).min;
|
|
if (_check) {
|
|
return x / -1; // can overflow
|
|
} else {
|
|
unchecked { return x / -1; } // overflow not reported
|
|
}
|
|
}
|
|
}
|
|
// ----
|
|
// Warning 4281: (118-123): CHC: Division by zero happens here.\nCounterexample:\n\na = 0\nb = 0\n = 0\n\nTransaction trace:\nC.constructor()\nC.f(0, 0)
|
|
// Warning 4984: (275-281): CHC: Overflow (resulting value larger than 0x80 * 2**248 - 1) happens here.\nCounterexample:\n\n_check = true\n = 0\n\nTransaction trace:\nC.constructor()\nC.g(true)
|