solidity/test/libsolidity/SMTChecker.cpp

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/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Unit tests for the SMT checker.
*/
#include <test/libsolidity/AnalysisFramework.h>
#include <test/Options.h>
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#include <boost/test/unit_test.hpp>
#include <string>
using namespace std;
using namespace langutil;
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namespace dev
{
namespace solidity
{
namespace test
{
class SMTCheckerFramework: public AnalysisFramework
{
protected:
virtual std::pair<SourceUnit const*, ErrorList>
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parseAnalyseAndReturnError(
std::string const& _source,
bool _reportWarnings = false,
bool _insertVersionPragma = true,
bool _allowMultipleErrors = false,
bool _allowRecoveryErrors = false
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)
{
return AnalysisFramework::parseAnalyseAndReturnError(
"pragma experimental SMTChecker;\n" + _source,
_reportWarnings,
_insertVersionPragma,
_allowMultipleErrors,
_allowRecoveryErrors
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);
}
};
BOOST_FIXTURE_TEST_SUITE(SMTChecker, SMTCheckerFramework)
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BOOST_AUTO_TEST_CASE(division)
{
string text = R"(
contract C {
function f(uint x, uint y) public pure returns (uint) {
return x / y;
}
}
)";
CHECK_WARNING(text, "Division by zero");
text = R"(
contract C {
function f(uint x, uint y) public pure returns (uint) {
require(y != 0);
return x / y;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
text = R"(
contract C {
function f(int x, int y) public pure returns (int) {
require(y != 0);
return x / y;
}
}
)";
CHECK_WARNING(text, "Overflow");
text = R"(
contract C {
function f(int x, int y) public pure returns (int) {
require(y != 0);
require(y != -1);
return x / y;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
text = R"(
contract C {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c;
if (a != 0) {
c = a * b;
require(c / a == b);
}
return c;
}
}
)";
CHECK_SUCCESS_OR_WARNING(text, "might happen");
text = R"(
contract C {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// TODO remove when SMTChecker sees that this code is the `else` of the `return`.
require(a != 0);
uint256 c = a * b;
require(c / a == b);
return c;
}
}
)";
CHECK_SUCCESS_OR_WARNING(text, "might happen");
text = R"(
contract C {
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0);
uint256 c = a / b;
return c;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
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}
BOOST_AUTO_TEST_CASE(division_truncates_correctly)
{
string text = R"(
contract C {
function f(uint x, uint y) public pure {
x = 7;
y = 2;
assert(x / y == 3);
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
text = R"(
contract C {
function f(int x, int y) public pure {
x = 7;
y = 2;
assert(x / y == 3);
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
text = R"(
contract C {
function f(int x, int y) public pure {
x = -7;
y = 2;
assert(x / y == -3);
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
contract C {
function f(int x, int y) public pure {
x = 7;
y = -2;
assert(x / y == -3);
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
contract C {
function f(int x, int y) public pure {
x = -7;
y = -2;
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assert(x / y == 3);
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}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(compound_assignment_division)
{
string text = R"(
contract C {
function f(uint x) public pure {
require(x == 2);
uint y = 10;
y /= y / x;
assert(y == x);
assert(y == 0);
}
}
)";
CHECK_WARNING(text, "Assertion violation");
text = R"(
contract C {
uint[] array;
function f(uint x, uint p) public {
require(x == 2);
require(array[p] == 10);
array[p] /= array[p] / x;
assert(array[p] == x);
assert(array[p] == 0);
}
}
)";
CHECK_WARNING(text, "Assertion violation");
text = R"(
contract C {
mapping (uint => uint) map;
function f(uint x, uint p) public {
require(x == 2);
require(map[p] == 10);
map[p] /= map[p] / x;
assert(map[p] == x);
assert(map[p] == 0);
}
}
)";
CHECK_WARNING(text, "Assertion violation");
}
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BOOST_AUTO_TEST_CASE(mod)
{
string text = R"(
contract C {
function f(int x, int y) public pure {
require(y == -10);
require(x == 100);
int z1 = x % y;
int z2 = x % -y;
assert(z1 == z2);
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(import_base)
{
CompilerStack c;
c.setSources({
{"base", R"(
pragma solidity >=0.0;
contract Base {
uint x;
address a;
function f() internal returns (uint) {
a = address(this);
++x;
return 2;
}
}
)"},
{"der", R"(
pragma solidity >=0.0;
pragma experimental SMTChecker;
import "base";
contract Der is Base {
function g(uint y) public {
x += f();
assert(y > x);
}
}
)"}
});
c.setEVMVersion(dev::test::Options::get().evmVersion());
BOOST_CHECK(c.compile());
unsigned asserts = 0;
for (auto const& e: c.errors())
{
string const* msg = e->comment();
BOOST_REQUIRE(msg);
if (msg->find("Assertion violation") != string::npos)
++asserts;
}
BOOST_CHECK_EQUAL(asserts, 1);
}
BOOST_AUTO_TEST_CASE(import_library)
{
CompilerStack c;
c.setSources({
{"lib", R"(
pragma solidity >=0.0;
library L {
uint constant one = 1;
function f() internal pure returns (uint) {
return one;
}
}
)"},
{"c", R"(
pragma solidity >=0.0;
pragma experimental SMTChecker;
import "lib";
contract C {
function g(uint x) public pure {
uint y = L.f();
assert(x > y);
}
}
)"}
});
c.setEVMVersion(dev::test::Options::get().evmVersion());
BOOST_CHECK(c.compile());
unsigned asserts = 0;
for (auto const& e: c.errors())
{
string const* msg = e->comment();
BOOST_REQUIRE(msg);
if (msg->find("Assertion violation") != string::npos)
++asserts;
}
BOOST_CHECK_EQUAL(asserts, 1);
}
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BOOST_AUTO_TEST_SUITE_END()
}
}
}