mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
134 lines
4.0 KiB
C++
134 lines
4.0 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 KnowledgeBase
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*/
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#include <test/Common.h>
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#include <test/libyul/Common.h>
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#include <libyul/Object.h>
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#include <libyul/optimiser/KnowledgeBase.h>
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#include <libyul/optimiser/SSAValueTracker.h>
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#include <libyul/optimiser/NameDispenser.h>
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#include <libyul/optimiser/CommonSubexpressionEliminator.h>
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#include <libyul/backends/evm/EVMDialect.h>
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#include <liblangutil/ErrorReporter.h>
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#include <boost/test/unit_test.hpp>
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using namespace std;
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using namespace solidity::langutil;
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namespace solidity::yul::test
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{
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class KnowledgeBaseTest
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{
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protected:
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KnowledgeBase constructKnowledgeBase(string const& _source)
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{
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ErrorList errorList;
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shared_ptr<AsmAnalysisInfo> analysisInfo;
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std::tie(m_object, analysisInfo) = yul::test::parse(_source, m_dialect, errorList);
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BOOST_REQUIRE(m_object && errorList.empty() && m_object->code);
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NameDispenser dispenser(m_dialect, *m_object->code);
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std::set<YulString> reserved;
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OptimiserStepContext context{m_dialect, dispenser, reserved, 0};
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CommonSubexpressionEliminator::run(context, *m_object->code);
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m_ssaValues(*m_object->code);
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for (auto const& [name, expression]: m_ssaValues.values())
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m_values[name].value = expression;
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return KnowledgeBase([this](YulString _var) { return util::valueOrNullptr(m_values, _var); });
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}
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EVMDialect m_dialect{EVMVersion{}, true};
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shared_ptr<Object> m_object;
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SSAValueTracker m_ssaValues;
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map<YulString, AssignedValue> m_values;
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};
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BOOST_FIXTURE_TEST_SUITE(KnowledgeBase, KnowledgeBaseTest)
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BOOST_AUTO_TEST_CASE(basic)
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{
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yul::KnowledgeBase kb = constructKnowledgeBase(R"({
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let a := calldataload(0)
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let b := calldataload(0)
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let zero := 0
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let c := add(b, 0)
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let d := mul(b, 0)
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let e := sub(a, b)
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})");
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BOOST_CHECK(!kb.knownToBeDifferent("a"_yulstring, "b"_yulstring));
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// This only works if the variable names are the same.
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// It assumes that SSA+CSE+Simplifier actually replaces the variables.
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BOOST_CHECK(!kb.valueIfKnownConstant("a"_yulstring));
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BOOST_CHECK(kb.valueIfKnownConstant("zero"_yulstring) == u256(0));
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BOOST_CHECK(kb.differenceIfKnownConstant("a"_yulstring, "b"_yulstring) == u256(0));
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BOOST_CHECK(kb.differenceIfKnownConstant("a"_yulstring, "c"_yulstring) == u256(0));
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BOOST_CHECK(kb.valueIfKnownConstant("e"_yulstring) == u256(0));
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}
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BOOST_AUTO_TEST_CASE(difference)
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{
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yul::KnowledgeBase kb = constructKnowledgeBase(R"({
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let a := calldataload(0)
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let b := add(a, 200)
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let c := add(a, 220)
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let d := add(12, c)
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let e := sub(c, 12)
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})");
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BOOST_CHECK(
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kb.differenceIfKnownConstant("c"_yulstring, "b"_yulstring) ==
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u256(20)
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);
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BOOST_CHECK(
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kb.differenceIfKnownConstant("b"_yulstring, "c"_yulstring) ==
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u256(-20)
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);
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BOOST_CHECK(!kb.knownToBeDifferentByAtLeast32("b"_yulstring, "c"_yulstring));
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BOOST_CHECK(kb.knownToBeDifferentByAtLeast32("b"_yulstring, "d"_yulstring));
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BOOST_CHECK(kb.knownToBeDifferentByAtLeast32("a"_yulstring, "b"_yulstring));
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BOOST_CHECK(kb.knownToBeDifferentByAtLeast32("b"_yulstring, "a"_yulstring));
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BOOST_CHECK(
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kb.differenceIfKnownConstant("e"_yulstring, "a"_yulstring) == u256(208)
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);
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BOOST_CHECK(
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kb.differenceIfKnownConstant("e"_yulstring, "b"_yulstring) == u256(8)
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);
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BOOST_CHECK(
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kb.differenceIfKnownConstant("a"_yulstring, "e"_yulstring) == u256(-208)
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);
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BOOST_CHECK(
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kb.differenceIfKnownConstant("b"_yulstring, "e"_yulstring) == u256(-8)
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);
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}
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BOOST_AUTO_TEST_SUITE_END()
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}
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