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https://github.com/ethereum/solidity
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Tests for knowledge base.
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@ -26,6 +26,8 @@
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#include <libyul/optimiser/KnowledgeBase.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/SSAValueTracker.h>
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#include <libyul/optimiser/DataFlowAnalyzer.h>
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#include <libyul/optimiser/DataFlowAnalyzer.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 <libyul/backends/evm/EVMDialect.h>
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#include <liblangutil/ErrorReporter.h>
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#include <liblangutil/ErrorReporter.h>
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@ -44,20 +46,25 @@ protected:
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KnowledgeBase constructKnowledgeBase(string const& _source)
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KnowledgeBase constructKnowledgeBase(string const& _source)
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{
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{
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ErrorList errorList;
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ErrorList errorList;
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shared_ptr<Object> object;
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shared_ptr<AsmAnalysisInfo> analysisInfo;
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shared_ptr<AsmAnalysisInfo> analysisInfo;
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std::tie(object, analysisInfo) = yul::test::parse(_source, m_dialect, errorList);
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std::tie(m_object, analysisInfo) = yul::test::parse(_source, m_dialect, errorList);
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BOOST_REQUIRE(object && errorList.empty() && object->code);
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BOOST_REQUIRE(m_object && errorList.empty() && m_object->code);
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SSAValueTracker ssaValues;
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NameDispenser dispenser(m_dialect, *m_object->code);
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ssaValues(*object->code);
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std::set<YulString> reserved;
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for (auto const& [name, expression]: ssaValues.values())
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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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m_values[name].value = expression;
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return KnowledgeBase(m_dialect, m_values);
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return KnowledgeBase(m_dialect, m_values);
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}
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}
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EVMDialect m_dialect{EVMVersion{}, true};
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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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map<YulString, AssignedValue> m_values;
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};
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};
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@ -75,10 +82,51 @@ BOOST_AUTO_TEST_CASE(basic)
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})");
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})");
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BOOST_CHECK(!kb.knownToBeDifferent("a"_yulstring, "b"_yulstring));
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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.knownToBeEqual("a"_yulstring, "b"_yulstring));
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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.valueIfKnownConstant("zero"_yulstring) == u256(0));
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}
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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(c, 12)
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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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BOOST_AUTO_TEST_SUITE_END()
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}
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}
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