mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
760 lines
14 KiB
C++
760 lines
14 KiB
C++
/*
|
|
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 <boost/test/unit_test.hpp>
|
|
|
|
#include <string>
|
|
|
|
using namespace std;
|
|
|
|
namespace dev
|
|
{
|
|
namespace solidity
|
|
{
|
|
namespace test
|
|
{
|
|
|
|
class SMTCheckerFramework: public AnalysisFramework
|
|
{
|
|
protected:
|
|
virtual std::pair<SourceUnit const*, ErrorList>
|
|
parseAnalyseAndReturnError(
|
|
std::string const& _source,
|
|
bool _reportWarnings = false,
|
|
bool _insertVersionPragma = true,
|
|
bool _allowMultipleErrors = false
|
|
)
|
|
{
|
|
return AnalysisFramework::parseAnalyseAndReturnError(
|
|
"pragma experimental SMTChecker;\n" + _source,
|
|
_reportWarnings,
|
|
_insertVersionPragma,
|
|
_allowMultipleErrors
|
|
);
|
|
}
|
|
};
|
|
|
|
BOOST_FIXTURE_TEST_SUITE(SMTChecker, SMTCheckerFramework)
|
|
|
|
BOOST_AUTO_TEST_CASE(smoke_test)
|
|
{
|
|
string text = R"(
|
|
contract C { }
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(simple_overflow)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint a, uint b) public pure returns (uint) { return a + b; }
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Overflow (resulting value larger than");
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(warn_on_typecast)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f() public pure returns (uint) {
|
|
return uint8(1);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion checker does not yet implement this expression.");
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(warn_on_struct)
|
|
{
|
|
string text = R"(
|
|
pragma experimental ABIEncoderV2;
|
|
contract C {
|
|
struct A { uint a; uint b; }
|
|
function f() public pure returns (A memory) {
|
|
return A({ a: 1, b: 2 });
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING_ALLOW_MULTI(text, (vector<string>{
|
|
"Experimental feature",
|
|
"Assertion checker does not yet implement this expression.",
|
|
"Assertion checker does not yet support the type of this variable."
|
|
}));
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(simple_assert)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint a) public pure { assert(a == 2); }
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(simple_assert_with_require)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint a) public pure { require(a < 10); assert(a < 20); }
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(assignment_in_declaration)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f() public pure { uint a = 2; assert(a == 2); }
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(function_call_does_not_clear_local_vars)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f() public {
|
|
uint a = 3;
|
|
this.f();
|
|
assert(a == 3);
|
|
f();
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(branches_merge_variables)
|
|
{
|
|
// Branch does not touch variable a
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 3;
|
|
if (x > 10) {
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
// Positive branch touches variable a, but assertion should still hold.
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 3;
|
|
if (x > 10) {
|
|
a = 3;
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
// Negative branch touches variable a, but assertion should still hold.
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 3;
|
|
if (x > 10) {
|
|
} else {
|
|
a = 3;
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
// Variable is not merged, if it is only read.
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 3;
|
|
if (x > 10) {
|
|
assert(a == 3);
|
|
} else {
|
|
assert(a == 3);
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
// Variable is reset in both branches
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 2;
|
|
if (x > 10) {
|
|
a = 3;
|
|
} else {
|
|
a = 3;
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
// Variable is reset in both branches
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 2;
|
|
if (x > 10) {
|
|
a = 3;
|
|
} else {
|
|
a = 4;
|
|
}
|
|
assert(a >= 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(branches_assert_condition)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
if (x > 10) {
|
|
assert(x > 9);
|
|
}
|
|
else
|
|
{
|
|
assert(x < 11);
|
|
}
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
if (x > 10) {
|
|
assert(x > 9);
|
|
}
|
|
else if (x > 2)
|
|
{
|
|
assert(x <= 10 && x > 2);
|
|
}
|
|
else
|
|
{
|
|
assert(0 <= x && x <= 2);
|
|
}
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(ways_to_merge_variables)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 3;
|
|
if (x > 10) {
|
|
a++;
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 3;
|
|
if (x > 10) {
|
|
++a;
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint a = 3;
|
|
if (x > 10) {
|
|
a = 5;
|
|
}
|
|
assert(a == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(bool_simple)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(bool x) public pure {
|
|
assert(x);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
text = R"(
|
|
contract C {
|
|
function f(bool x, bool y) public pure {
|
|
assert(x == y);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
text = R"(
|
|
contract C {
|
|
function f(bool x, bool y) public pure {
|
|
bool z = x || y;
|
|
assert(!(x && y) || z);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(bool x) public pure {
|
|
if (x) {
|
|
assert(x);
|
|
} else {
|
|
assert(!x);
|
|
}
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(bool x) public pure {
|
|
bool y = x;
|
|
assert(x == y);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(bool x) public pure {
|
|
require(x);
|
|
bool y;
|
|
y = false;
|
|
assert(x || y);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(bool_int_mixed)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(bool x) public pure {
|
|
uint a;
|
|
if (x)
|
|
a = 1;
|
|
assert(!x || a > 0);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(bool x, uint a) public pure {
|
|
require(!x || a > 0);
|
|
uint b = a;
|
|
assert(!x || b > 0);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(bool x, bool y) public pure {
|
|
uint a;
|
|
if (x) {
|
|
if (y) {
|
|
a = 0;
|
|
} else {
|
|
a = 1;
|
|
}
|
|
} else {
|
|
if (y) {
|
|
a = 1;
|
|
} else {
|
|
a = 0;
|
|
}
|
|
}
|
|
bool xor_x_y = (x && !y) || (!x && y);
|
|
assert(!xor_x_y || a > 0);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(storage_value_vars)
|
|
{
|
|
string text = R"(
|
|
contract C
|
|
{
|
|
address a;
|
|
bool b;
|
|
uint c;
|
|
function f(uint x) public {
|
|
if (x == 0)
|
|
{
|
|
a = 0x0000000000000000000000000000000000000100;
|
|
b = true;
|
|
}
|
|
else
|
|
{
|
|
a = 0x0000000000000000000000000000000000000200;
|
|
b = false;
|
|
}
|
|
assert(a > 0x0000000000000000000000000000000000000000 && b);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
text = R"(
|
|
contract C
|
|
{
|
|
address a;
|
|
bool b;
|
|
uint c;
|
|
function f() public view {
|
|
assert(c > 0);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
text = R"(
|
|
contract C
|
|
{
|
|
function f(uint x) public {
|
|
if (x == 0)
|
|
{
|
|
a = 0x0000000000000000000000000000000000000100;
|
|
b = true;
|
|
}
|
|
else
|
|
{
|
|
a = 0x0000000000000000000000000000000000000200;
|
|
b = false;
|
|
}
|
|
assert(b == (a < 0x0000000000000000000000000000000000000200));
|
|
}
|
|
|
|
function g() public view {
|
|
require(a < 0x0000000000000000000000000000000000000100);
|
|
assert(c >= 0);
|
|
}
|
|
address a;
|
|
bool b;
|
|
uint c;
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C
|
|
{
|
|
function f() public view {
|
|
assert(c > 0);
|
|
}
|
|
uint c;
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(while_loop_simple)
|
|
{
|
|
// Check that variables are cleared
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
x = 2;
|
|
while (x > 1) {
|
|
x = 2;
|
|
}
|
|
assert(x == 2);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
// Check that condition is assumed.
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
while (x == 2) {
|
|
assert(x == 2);
|
|
}
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
// Check that condition is not assumed after the body anymore
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
while (x == 2) {
|
|
}
|
|
assert(x == 2);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
// Check that negation of condition is not assumed after the body anymore
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
while (x == 2) {
|
|
}
|
|
assert(x != 2);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
// Check that side-effects of condition are taken into account
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x, uint y) public pure {
|
|
x = 7;
|
|
while ((x = y) > 0) {
|
|
}
|
|
assert(x == 7);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation happens here");
|
|
}
|
|
|
|
BOOST_AUTO_TEST_CASE(constant_condition)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
if (x >= 0) { revert(); }
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Condition is always true");
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
if (x >= 10) { if (x < 10) { revert(); } }
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Condition is always false");
|
|
// a plain literal constant is fine
|
|
text = R"(
|
|
contract C {
|
|
function f(uint) public pure {
|
|
if (true) { revert(); }
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
}
|
|
|
|
|
|
BOOST_AUTO_TEST_CASE(for_loop)
|
|
{
|
|
string text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
require(x == 2);
|
|
for (;;) {}
|
|
assert(x == 2);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
for (; x == 2; ) {
|
|
assert(x == 2);
|
|
}
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
for (uint y = 2; x < 10; ) {
|
|
assert(y == 2);
|
|
}
|
|
}
|
|
}
|
|
)";
|
|
CHECK_SUCCESS_NO_WARNINGS(text);
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
for (uint y = 2; x < 10; y = 3) {
|
|
assert(y == 2);
|
|
}
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation");
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint y;
|
|
for (y = 2; x < 10; ) {
|
|
y = 3;
|
|
}
|
|
assert(y == 3);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation");
|
|
text = R"(
|
|
contract C {
|
|
function f(uint x) public pure {
|
|
uint y;
|
|
for (y = 2; x < 10; ) {
|
|
y = 3;
|
|
}
|
|
assert(y == 2);
|
|
}
|
|
}
|
|
)";
|
|
CHECK_WARNING(text, "Assertion violation");
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
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);
|
|
}
|
|
|
|
BOOST_AUTO_TEST_SUITE_END()
|
|
|
|
}
|
|
}
|
|
}
|