cerc-io/solidity
16
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
06189ae57f
solidity/test/libsolidity/SMTChecker.cpp
Christian Parpart d67322a186 Introduce namespace langutil in liblangutil directory. 
Also:
- Use {}-style list initialisation for SourceLocation construction
- Introduce new system includes
- Changes the API of the Scanner to take source as value (with move) as opposed to as a reference
2018-11-21 19:13:44 +00:00

751 lines
14 KiB
C++
Raw Blame History

/*
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;
using namespace langutil;
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(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_ALLOW_MULTI(text, (vector<string>{
"Condition is always true",
"Assertion checker does not yet implement this type of function call"
}));
text = R"(
contract C {
function f(uint x) public pure {
if (x >= 10) { if (x < 10) { revert(); } }
}
}
)";
CHECK_WARNING_ALLOW_MULTI(text, (vector<string>{
"Condition is always false",
"Assertion checker does not yet implement this type of function call"
}));
// a plain literal constant is fine
text = R"(
contract C {
function f(uint) public pure {
if (true) { revert(); }
}
}
)";
CHECK_WARNING(text, "Assertion checker does not yet implement this type of function call");
}
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()
}
}
}
Reference in New Issue View Git Blame Copy Permalink