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[SMTChecker] Add and use tuple sort

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This commit is contained in:
Leonardo Alt 2020-04-03 15:10:16 +02:00
parent 7a9e024e90
commit 5d9dd654cf
11 changed files with 248 additions and 62 deletions
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15
libsolidity/formal/CVC4Interface.cpp
View File

@ -196,6 +196,16 @@ CVC4::Expr CVC4Interface::toCVC4Expr(Expression const& _expr)
solAssert(sortSort, "");
return m_context.mkConst(CVC4::ArrayStoreAll(cvc4Sort(*sortSort->inner), arguments[1]));
}
else if (n == "tuple_get")
{
shared_ptr<TupleSort> tupleSort = std::dynamic_pointer_cast<TupleSort>(_expr.arguments[0].sort);
solAssert(tupleSort, "");
CVC4::DatatypeType tt = m_context.mkTupleType(cvc4Sort(tupleSort->components));
CVC4::Datatype const& dt = tt.getDatatype();
size_t index = std::stoi(_expr.arguments[1].name);
CVC4::Expr s = dt[0][index].getSelector();
return m_context.mkExpr(CVC4::kind::APPLY_SELECTOR, s, arguments[0]);
}
solAssert(false, "");
}
@ -229,6 +239,11 @@ CVC4::Type CVC4Interface::cvc4Sort(Sort const& _sort)
auto const& arraySort = dynamic_cast<ArraySort const&>(_sort);
return m_context.mkArrayType(cvc4Sort(*arraySort.domain), cvc4Sort(*arraySort.range));
}
case Kind::Tuple:
{
auto const& tupleSort = dynamic_cast<TupleSort const&>(_sort);
return m_context.mkTupleType(cvc4Sort(tupleSort.components));
}
default:
break;
}

64
libsolidity/formal/SMTEncoder.cpp
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@ -296,16 +296,22 @@ void SMTEncoder::endVisit(VariableDeclarationStatement const& _varDecl)
{
auto symbTuple = dynamic_pointer_cast<smt::SymbolicTupleVariable>(m_context.expression(*init));
solAssert(symbTuple, "");
auto const& components = symbTuple->components();
auto const& symbComponents = symbTuple->components();
auto tupleType = dynamic_cast<TupleType const*>(init->annotation().type);
solAssert(tupleType, "");
solAssert(tupleType->components().size() == symbTuple->components().size(), "");
auto const& components = tupleType->components();
auto const& declarations = _varDecl.declarations();
solAssert(components.size() == declarations.size(), "");
solAssert(symbComponents.size() == declarations.size(), "");
for (unsigned i = 0; i < declarations.size(); ++i)
if (
components.at(i) &&
declarations.at(i) &&
m_context.knownVariable(*declarations.at(i))
)
assignment(*declarations.at(i), components.at(i)->currentValue(declarations.at(i)->type()));
assignment(*declarations.at(i), symbTuple->component(i, components.at(i), declarations.at(i)->type()));
}
}
else if (m_context.knownVariable(*_varDecl.declarations().front()))
@ -354,7 +360,7 @@ void SMTEncoder::endVisit(Assignment const& _assignment)
{
auto const& type = _assignment.annotation().type;
vector<smt::Expression> rightArguments;
if (_assignment.rightHandSide().annotation().type->category() == Type::Category::Tuple)
if (auto const* tupleTypeRight = dynamic_cast<TupleType const*>(_assignment.rightHandSide().annotation().type))
{
auto symbTupleLeft = dynamic_pointer_cast<smt::SymbolicTupleVariable>(m_context.expression(_assignment.leftHandSide()));
solAssert(symbTupleLeft, "");
@ -365,17 +371,16 @@ void SMTEncoder::endVisit(Assignment const& _assignment)
auto const& rightComponents = symbTupleRight->components();
solAssert(leftComponents.size() == rightComponents.size(), "");
for (unsigned i = 0; i < leftComponents.size(); ++i)
{
auto const& left = leftComponents.at(i);
auto const& right = rightComponents.at(i);
/// Right hand side tuple component cannot be empty.
solAssert(right, "");
if (left)
rightArguments.push_back(right->currentValue(left->originalType()));
else
rightArguments.push_back(right->currentValue());
}
auto tupleTypeLeft = dynamic_cast<TupleType const*>(_assignment.leftHandSide().annotation().type);
solAssert(tupleTypeLeft, "");
solAssert(tupleTypeLeft->components().size() == leftComponents.size(), "");
auto const& typesLeft = tupleTypeLeft->components();
solAssert(tupleTypeRight->components().size() == rightComponents.size(), "");
auto const& typesRight = tupleTypeRight->components();
for (unsigned i = 0; i < rightComponents.size(); ++i)
rightArguments.push_back(symbTupleRight->component(i, typesRight.at(i), typesLeft.at(i)));
}
else
{
@ -418,17 +423,16 @@ void SMTEncoder::endVisit(TupleExpression const& _tuple)
solAssert(symbComponents.size() == tupleComponents->size(), "");
for (unsigned i = 0; i < symbComponents.size(); ++i)
{
auto sComponent = symbComponents.at(i);
auto tComponent = tupleComponents->at(i);
if (sComponent && tComponent)
if (tComponent)
{
if (auto varDecl = identifierToVariable(*tComponent))
m_context.addAssertion(sComponent->currentValue() == currentValue(*varDecl));
m_context.addAssertion(symbTuple->component(i) == currentValue(*varDecl));
else
{
if (!m_context.knownExpression(*tComponent))
createExpr(*tComponent);
m_context.addAssertion(sComponent->currentValue() == expr(*tComponent));
m_context.addAssertion(symbTuple->component(i) == expr(*tComponent));
}
}
}
@ -807,13 +811,15 @@ void SMTEncoder::endVisit(Return const& _return)
{
auto const& symbTuple = dynamic_pointer_cast<smt::SymbolicTupleVariable>(m_context.expression(*_return.expression()));
solAssert(symbTuple, "");
auto const& components = symbTuple->components();
solAssert(components.size() == returnParams.size(), "");
solAssert(symbTuple->components().size() == returnParams.size(), "");
auto const* tupleType = dynamic_cast<TupleType const*>(_return.expression()->annotation().type);
solAssert(tupleType, "");
auto const& types = tupleType->components();
solAssert(types.size() == returnParams.size(), "");
for (unsigned i = 0; i < returnParams.size(); ++i)
{
solAssert(components.at(i), "");
m_context.addAssertion(components.at(i)->currentValue(returnParams.at(i)->type()) == m_context.newValue(*returnParams.at(i)));
}
m_context.addAssertion(symbTuple->component(i, types.at(i), returnParams.at(i)->type()) == m_context.newValue(*returnParams.at(i)));
}
else if (returnParams.size() == 1)
m_context.addAssertion(expr(*_return.expression(), returnParams.front()->type()) == m_context.newValue(*returnParams.front()));
@ -1676,14 +1682,10 @@ void SMTEncoder::createReturnedExpressions(FunctionCall const& _funCall)
solAssert(symbComponents.size() == returnParams.size(), "");
for (unsigned i = 0; i < symbComponents.size(); ++i)
{
auto sComponent = symbComponents.at(i);
auto param = returnParams.at(i);
solAssert(param, "");
if (sComponent)
{
solAssert(m_context.knownVariable(*param), "");
m_context.addAssertion(sComponent->currentValue() == currentValue(*param));
}
solAssert(m_context.knownVariable(*param), "");
m_context.addAssertion(symbTuple->component(i) == currentValue(*param));
}
}
else if (returnParams.size() == 1)

26
libsolidity/formal/SMTLib2Interface.cpp
View File

@ -28,6 +28,7 @@
#include <iostream>
#include <memory>
#include <stdexcept>
#include <string>
using namespace std;
using namespace solidity;
@ -50,6 +51,7 @@ void SMTLib2Interface::reset()
m_accumulatedOutput.clear();
m_accumulatedOutput.emplace_back();
m_variables.clear();
m_userSorts.clear();
write("(set-option :produce-models true)");
write("(set-logic ALL)");
}
@ -145,6 +147,14 @@ string SMTLib2Interface::toSExpr(smt::Expression const& _expr)
sexpr += "(as const " + toSmtLibSort(*arraySort) + ") ";
sexpr += toSExpr(_expr.arguments.at(1));
}
else if (_expr.name == "tuple_get")
{
solAssert(_expr.arguments.size() == 2, "");
auto tupleSort = dynamic_pointer_cast<TupleSort>(_expr.arguments.at(0).sort);
unsigned index = std::stoi(_expr.arguments.at(1).name);
solAssert(index < tupleSort->members.size(), "");
sexpr += tupleSort->members.at(index) + " " + toSExpr(_expr.arguments.at(0));
}
else
{
sexpr += _expr.name;
@ -169,6 +179,22 @@ string SMTLib2Interface::toSmtLibSort(Sort const& _sort)
solAssert(arraySort.domain && arraySort.range, "");
return "(Array " + toSmtLibSort(*arraySort.domain) + ' ' + toSmtLibSort(*arraySort.range) + ')';
}
case Kind::Tuple:
{
auto const& tupleSort = dynamic_cast<TupleSort const&>(_sort);
if (!m_userSorts.count(tupleSort.name))
{
m_userSorts.insert(tupleSort.name);
string decl("(declare-datatypes ((" + tupleSort.name + " 0)) (((" + tupleSort.name);
solAssert(tupleSort.members.size() == tupleSort.components.size(), "");
for (unsigned i = 0; i < tupleSort.members.size(); ++i)
decl += " (" + tupleSort.members.at(i) + " " + toSmtLibSort(*tupleSort.components.at(i)) + ")";
decl += "))))";
write(decl);
}
return tupleSort.name;
}
default:
solAssert(false, "Invalid SMT sort");
}

1
libsolidity/formal/SMTLib2Interface.h
View File

@ -74,6 +74,7 @@ private:
std::vector<std::string> m_accumulatedOutput;
std::map<std::string, SortPointer> m_variables;
std::set<std::string> m_userSorts;
std::map<util::h256, std::string> const& m_queryResponses;
std::vector<std::string> m_unhandledQueries;

16
libsolidity/formal/SolverInterface.h
View File

@ -94,7 +94,8 @@ public:
{"mod", 2},
{"select", 2},
{"store", 3},
{"const_array", 2}
{"const_array", 2},
{"tuple_get", 2}
};
return operatorsArity.count(name) && operatorsArity.at(name) == arguments.size();
}
@ -166,6 +167,19 @@ public:
);
}
static Expression tuple_get(Expression _tuple, size_t _index)
{
solAssert(_tuple.sort->kind == Kind::Tuple, "");
std::shared_ptr<TupleSort> tupleSort = std::dynamic_pointer_cast<TupleSort>(_tuple.sort);
solAssert(tupleSort, "");
solAssert(_index < tupleSort->components.size(), "");
return Expression(
"tuple_get",
std::vector<Expression>{std::move(_tuple), Expression(_index)},
tupleSort->components.at(_index)
);
}
friend Expression operator!(Expression _a)
{
return Expression("not", std::move(_a), Kind::Bool);

43
libsolidity/formal/Sorts.h
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@ -33,7 +33,8 @@ enum class Kind
Bool,
Function,
Array,
Sort
Sort,
Tuple
};
struct Sort
@ -115,6 +116,46 @@ struct SortSort: public Sort
SortPointer inner;
};
struct TupleSort: public Sort
{
TupleSort(
std::string _name,
std::vector<std::string> _members,
std::vector<SortPointer> _components
):
Sort(Kind::Tuple),
name(std::move(_name)),
members(std::move(_members)),
components(std::move(_components))
{}
bool operator==(Sort const& _other) const override
{
if (!Sort::operator==(_other))
return false;
auto _otherTuple = dynamic_cast<TupleSort const*>(&_other);
solAssert(_otherTuple, "");
if (name != _otherTuple->name)
return false;
if (members != _otherTuple->members)
return false;
if (components.size() != _otherTuple->components.size())
return false;
if (!std::equal(
components.begin(),
components.end(),
_otherTuple->components.begin(),
[&](SortPointer _a, SortPointer _b) { return *_a == *_b; }
))
return false;
return true;
}
std::string const name;
std::vector<std::string> const members;
std::vector<SortPointer> const components;
};
/** Frequently used sorts.*/
struct SortProvider
{

43
libsolidity/formal/SymbolicTypes.cpp
View File

@ -75,6 +75,23 @@ SortPointer smtSort(frontend::Type const& _type)
return make_shared<ArraySort>(SortProvider::intSort, smtSortAbstractFunction(*arrayType->baseType()));
}
}
case Kind::Tuple:
{
auto tupleType = dynamic_cast<frontend::TupleType const*>(&_type);
solAssert(tupleType, "");
vector<string> members;
static unsigned tupleTypeId = 0;
for (auto const& component: tupleType->components())
if (component)
members.emplace_back(component->identifier() + "_" + to_string(tupleTypeId++));
else
members.emplace_back("null_type_" + to_string(tupleTypeId++));
return make_shared<TupleSort>(
_type.identifier() + "_" + to_string(tupleTypeId++),
members,
smtSortAbstractFunction(tupleType->components())
);
}
default:
// Abstract case.
return SortProvider::intSort;
@ -96,6 +113,17 @@ SortPointer smtSortAbstractFunction(frontend::Type const& _type)
return smtSort(_type);
}
vector<SortPointer> smtSortAbstractFunction(vector<frontend::TypePointer> const& _types)
{
vector<SortPointer> sorts;
for (auto const& type: _types)
if (type)
sorts.push_back(smtSortAbstractFunction(*type));
else
sorts.push_back(SortProvider::intSort);
return sorts;
}
Kind smtKind(frontend::Type::Category _category)
{
if (isNumber(_category))
@ -106,6 +134,8 @@ Kind smtKind(frontend::Type::Category _category)
return Kind::Function;
else if (isMapping(_category) || isArray(_category))
return Kind::Array;
else if (isTuple(_category))
return Kind::Tuple;
// Abstract case.
return Kind::Int;
}
@ -350,4 +380,17 @@ void setSymbolicUnknownValue(Expression _expr, frontend::TypePointer const& _typ
}
}
optional<Expression> symbolicTypeConversion(TypePointer _from, TypePointer _to)
{
if (_to && _from)
// StringLiterals are encoded as SMT arrays in the generic case,
// but they can also be compared/assigned to fixed bytes, in which
// case they'd need to be encoded as numbers.
if (auto strType = dynamic_cast<StringLiteralType const*>(_from))
if (_to->category() == frontend::Type::Category::FixedBytes)
return smt::Expression(u256(toHex(util::asBytes(strType->value()), util::HexPrefix::Add)));
return std::nullopt;
}
}

2
libsolidity/formal/SymbolicTypes.h
View File

@ -31,6 +31,7 @@ std::vector<SortPointer> smtSort(std::vector<frontend::TypePointer> const& _type
/// If _type has type Function, abstract it to Integer.
/// Otherwise return smtSort(_type).
SortPointer smtSortAbstractFunction(frontend::Type const& _type);
std::vector<SortPointer> smtSortAbstractFunction(std::vector<frontend::TypePointer> const& _types);
/// Returns the SMT kind that models the Solidity type type category _category.
Kind smtKind(frontend::Type::Category _category);
@ -69,4 +70,5 @@ void setSymbolicZeroValue(Expression _expr, frontend::TypePointer const& _type,
void setSymbolicUnknownValue(SymbolicVariable const& _variable, EncodingContext& _context);
void setSymbolicUnknownValue(Expression _expr, frontend::TypePointer const& _type, EncodingContext& _context);
std::optional<Expression> symbolicTypeConversion(TypePointer _from, TypePointer _to);
}

55
libsolidity/formal/SymbolicVariables.cpp
View File

@ -230,16 +230,9 @@ SymbolicArrayVariable::SymbolicArrayVariable(
smt::Expression SymbolicArrayVariable::currentValue(frontend::TypePointer const& _targetType) const
{
if (_targetType)
{
solAssert(m_originalType, "");
// StringLiterals are encoded as SMT arrays in the generic case,
// but they can also be compared/assigned to fixed bytes, in which
// case they'd need to be encoded as numbers.
if (auto strType = dynamic_cast<StringLiteralType const*>(m_originalType))
if (_targetType->category() == frontend::Type::Category::FixedBytes)
return smt::Expression(u256(toHex(util::asBytes(strType->value()), util::HexPrefix::Add)));
}
optional<smt::Expression> conversion = symbolicTypeConversion(m_originalType, _targetType);
if (conversion)
return *conversion;
return SymbolicVariable::currentValue(_targetType);
}
@ -262,16 +255,34 @@ SymbolicTupleVariable::SymbolicTupleVariable(
SymbolicVariable(_type, _type, move(_uniqueName), _context)
{
solAssert(isTuple(m_type->category()), "");
auto const& tupleType = dynamic_cast<TupleType const&>(*m_type);
auto const& componentsTypes = tupleType.components();
for (unsigned i = 0; i < componentsTypes.size(); ++i)
if (componentsTypes.at(i))
{
string componentName = m_uniqueName + "_component_" + to_string(i);
auto result = smt::newSymbolicVariable(*componentsTypes.at(i), componentName, m_context);
solAssert(result.second, "");
m_components.emplace_back(move(result.second));
}
else
m_components.emplace_back(nullptr);
}
SymbolicTupleVariable::SymbolicTupleVariable(
SortPointer _sort,
string _uniqueName,
EncodingContext& _context
):
SymbolicVariable(move(_sort), move(_uniqueName), _context)
{
solAssert(m_sort->kind == Kind::Tuple, "");
}
vector<SortPointer> const& SymbolicTupleVariable::components()
{
auto tupleSort = dynamic_pointer_cast<TupleSort>(m_sort);
solAssert(tupleSort, "");
return tupleSort->components;
}
smt::Expression SymbolicTupleVariable::component(
size_t _index,
TypePointer _fromType,
TypePointer _toType
)
{
optional<smt::Expression> conversion = symbolicTypeConversion(_fromType, _toType);
if (conversion)
return *conversion;
return smt::Expression::tuple_get(currentValue(), _index);
}

18
libsolidity/formal/SymbolicVariables.h
View File

@ -249,14 +249,18 @@ public:
std::string _uniqueName,
EncodingContext& _context
);
SymbolicTupleVariable(
SortPointer _sort,
std::string _uniqueName,
EncodingContext& _context
);
std::vector<std::shared_ptr<SymbolicVariable>> const& components()
{
return m_components;
}
private:
std::vector<std::shared_ptr<SymbolicVariable>> m_components;
std::vector<SortPointer> const& components();
Expression component(
size_t _index,
TypePointer _fromType = nullptr,
TypePointer _toType = nullptr
);
};
}

27
libsolidity/formal/Z3Interface.cpp
View File

@ -193,6 +193,11 @@ z3::expr Z3Interface::toZ3Expr(Expression const& _expr)
solAssert(arraySort && arraySort->domain, "");
return z3::const_array(z3Sort(*arraySort->domain), arguments[1]);
}
else if (n == "tuple_get")
{
size_t index = std::stoi(_expr.arguments[1].name);
return z3::func_decl(m_context, Z3_get_tuple_sort_field_decl(m_context, z3Sort(*_expr.arguments[0].sort), index))(arguments[0]);
}
solAssert(false, "");
}
@ -217,6 +222,28 @@ z3::sort Z3Interface::z3Sort(Sort const& _sort)
auto const& arraySort = dynamic_cast<ArraySort const&>(_sort);
return m_context.array_sort(z3Sort(*arraySort.domain), z3Sort(*arraySort.range));
}
case Kind::Tuple:
{
auto const& tupleSort = dynamic_cast<TupleSort const&>(_sort);
vector<char const*> cMembers;
for (auto const& member: tupleSort.members)
cMembers.emplace_back(member.c_str());
/// Using this instead of the function below because with that one
/// we can't use `&sorts[0]` here.
vector<z3::sort> sorts;
for (auto const& sort: tupleSort.components)
sorts.push_back(z3Sort(*sort));
z3::func_decl_vector projs(m_context);
z3::func_decl tupleConstructor = m_context.tuple_sort(
tupleSort.name.c_str(),
tupleSort.members.size(),
&cMembers[0],
&sorts[0],
projs
);
return tupleConstructor.range();
}
default:
break;
}