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++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Unit tests for the SMT checker.
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*/
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#include <test/libsolidity/AnalysisFramework.h>
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#include <boost/test/unit_test.hpp>
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#include <string>
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using namespace std;
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namespace dev
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{
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namespace solidity
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{
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namespace test
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{
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class SMTCheckerFramework: public AnalysisFramework
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{
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protected:
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virtual std::pair<SourceUnit const*, ErrorList>
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parseAnalyseAndReturnError(
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std::string const& _source,
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bool _reportWarnings = false,
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bool _insertVersionPragma = true,
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bool _allowMultipleErrors = false
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)
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{
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return AnalysisFramework::parseAnalyseAndReturnError(
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"pragma experimental SMTChecker;\n" + _source,
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_reportWarnings,
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_insertVersionPragma,
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_allowMultipleErrors
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);
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}
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};
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BOOST_FIXTURE_TEST_SUITE(SMTChecker, SMTCheckerFramework)
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BOOST_AUTO_TEST_CASE(smoke_test)
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{
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string text = R"(
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contract C { }
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(simple_overflow)
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{
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string text = R"(
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contract C {
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function f(uint a, uint b) public pure returns (uint) { return a + b; }
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}
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)";
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CHECK_WARNING(text, "Overflow (resulting value larger than");
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}
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BOOST_AUTO_TEST_CASE(warn_on_typecast)
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{
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string text = R"(
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contract C {
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function f() public pure returns (uint) {
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return uint8(1);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion checker does not yet implement this expression.");
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}
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BOOST_AUTO_TEST_CASE(warn_on_struct)
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{
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string text = R"(
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pragma experimental ABIEncoderV2;
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contract C {
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struct A { uint a; uint b; }
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function f() public pure returns (A) {
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return A({ a: 1, b: 2 });
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}
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}
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)";
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CHECK_WARNING_ALLOW_MULTI(text, (vector<string>{
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"Experimental feature",
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"Assertion checker does not yet implement this expression.",
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"Assertion checker does not yet support the type of this variable."
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}));
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}
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BOOST_AUTO_TEST_CASE(simple_assert)
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{
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string text = R"(
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contract C {
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function f(uint a) public pure { assert(a == 2); }
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here for");
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}
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BOOST_AUTO_TEST_CASE(simple_assert_with_require)
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{
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string text = R"(
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contract C {
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function f(uint a) public pure { require(a < 10); assert(a < 20); }
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(assignment_in_declaration)
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{
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string text = R"(
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contract C {
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function f() public pure { uint a = 2; assert(a == 2); }
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(function_call_does_not_clear_local_vars)
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{
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string text = R"(
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contract C {
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function f() public {
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uint a = 3;
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this.f();
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assert(a == 3);
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f();
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assert(a == 3);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(branches_merge_variables)
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{
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// Branch does not touch variable a
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string text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 3;
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if (x > 10) {
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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// Positive branch touches variable a, but assertion should still hold.
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text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 3;
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if (x > 10) {
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a = 3;
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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// Negative branch touches variable a, but assertion should still hold.
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text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 3;
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if (x > 10) {
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} else {
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a = 3;
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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// Variable is not merged, if it is only read.
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text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 3;
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if (x > 10) {
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assert(a == 3);
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} else {
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assert(a == 3);
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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// Variable is reset in both branches
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text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 2;
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if (x > 10) {
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a = 3;
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} else {
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a = 3;
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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// Variable is reset in both branches
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text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 2;
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if (x > 10) {
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a = 3;
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} else {
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a = 4;
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}
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assert(a >= 3);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(branches_assert_condition)
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{
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string text = R"(
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contract C {
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function f(uint x) public pure {
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if (x > 10) {
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assert(x > 9);
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}
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else
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{
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assert(x < 11);
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}
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(uint x) public pure {
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if (x > 10) {
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assert(x > 9);
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}
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else if (x > 2)
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{
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assert(x <= 10 && x > 2);
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}
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else
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{
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assert(0 <= x && x <= 2);
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}
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(ways_to_merge_variables)
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{
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string text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 3;
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if (x > 10) {
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a++;
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 3;
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if (x > 10) {
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++a;
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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text = R"(
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contract C {
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function f(uint x) public pure {
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uint a = 3;
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if (x > 10) {
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a = 5;
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}
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assert(a == 3);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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}
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BOOST_AUTO_TEST_CASE(bool_simple)
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{
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string text = R"(
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contract C {
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function f(bool x) public pure {
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assert(x);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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text = R"(
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contract C {
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function f(bool x, bool y) public pure {
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assert(x == y);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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text = R"(
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contract C {
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function f(bool x, bool y) public pure {
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bool z = x || y;
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assert(!(x && y) || z);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(bool x) public pure {
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if(x) {
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assert(x);
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} else {
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assert(!x);
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}
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(bool x) public pure {
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bool y = x;
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assert(x == y);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(bool x) public pure {
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require(x);
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bool y;
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y = false;
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assert(x || y);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(bool_int_mixed)
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{
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string text = R"(
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contract C {
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function f(bool x) public pure {
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uint a;
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if(x)
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a = 1;
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assert(!x || a > 0);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(bool x, uint a) public pure {
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require(!x || a > 0);
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uint b = a;
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assert(!x || b > 0);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(bool x, bool y) public pure {
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uint a;
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if (x) {
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if (y) {
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a = 0;
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} else {
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a = 1;
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}
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} else {
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if (y) {
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a = 1;
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} else {
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a = 0;
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}
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}
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bool xor_x_y = (x && !y) || (!x && y);
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assert(!xor_x_y || a > 0);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(storage_value_vars)
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{
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string text = R"(
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contract C
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{
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address a;
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bool b;
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uint c;
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function f(uint x) public {
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if (x == 0)
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{
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a = 0x0000000000000000000000000000000000000100;
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b = true;
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}
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else
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{
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a = 0x0000000000000000000000000000000000000200;
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b = false;
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}
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assert(a > 0x0000000000000000000000000000000000000000 && b);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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text = R"(
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contract C
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{
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address a;
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bool b;
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uint c;
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function f() public view {
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assert(c > 0);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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text = R"(
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contract C
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{
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function f(uint x) public {
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if (x == 0)
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{
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a = 0x0000000000000000000000000000000000000100;
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b = true;
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}
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else
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{
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a = 0x0000000000000000000000000000000000000200;
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b = false;
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}
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assert(b == (a < 0x0000000000000000000000000000000000000200));
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}
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function g() public view {
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require(a < 0x0000000000000000000000000000000000000100);
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assert(c >= 0);
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}
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address a;
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bool b;
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uint c;
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C
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{
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function f() public view {
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assert(c > 0);
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}
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uint c;
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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}
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BOOST_AUTO_TEST_CASE(while_loop_simple)
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{
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// Check that variables are cleared
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string text = R"(
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contract C {
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function f(uint x) public pure {
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x = 2;
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while (x > 1) {
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x = 2;
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}
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assert(x == 2);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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// Check that condition is assumed.
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text = R"(
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contract C {
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function f(uint x) public pure {
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while (x == 2) {
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assert(x == 2);
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}
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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// Check that condition is not assumed after the body anymore
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text = R"(
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contract C {
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function f(uint x) public pure {
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while (x == 2) {
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}
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assert(x == 2);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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// Check that negation of condition is not assumed after the body anymore
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text = R"(
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contract C {
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function f(uint x) public pure {
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while (x == 2) {
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}
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assert(x != 2);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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// Check that side-effects of condition are taken into account
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text = R"(
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contract C {
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function f(uint x, uint y) public pure {
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x = 7;
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while ((x = y) > 0) {
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}
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assert(x == 7);
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}
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}
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)";
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CHECK_WARNING(text, "Assertion violation happens here");
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}
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BOOST_AUTO_TEST_CASE(constant_condition)
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{
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string text = R"(
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contract C {
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function f(uint x) public pure {
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if (x >= 0) { revert(); }
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}
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}
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)";
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CHECK_WARNING(text, "Condition is always true");
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text = R"(
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contract C {
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function f(uint x) public pure {
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if (x >= 10) { if (x < 10) { revert(); } }
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}
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}
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)";
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CHECK_WARNING(text, "Condition is always false");
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// a plain literal constant is fine
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text = R"(
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contract C {
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function f(uint) public pure {
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if (true) { revert(); }
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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}
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BOOST_AUTO_TEST_CASE(for_loop)
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{
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string text = R"(
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contract C {
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function f(uint x) public pure {
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require(x == 2);
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for (;;) {}
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assert(x == 2);
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(uint x) public pure {
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for (; x == 2; ) {
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assert(x == 2);
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}
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(uint x) public pure {
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for (uint y = 2; x < 10; ) {
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assert(y == 2);
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}
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}
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}
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)";
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CHECK_SUCCESS_NO_WARNINGS(text);
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text = R"(
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contract C {
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function f(uint x) public pure {
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for (uint y = 2; x < 10; y = 3) {
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assert(y == 2);
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}
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}
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}
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)";
|
|
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()
|
|
|
|
}
|
|
}
|
|
}
|