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Merge pull request #8611 from ethereum/smt_array_variable_sort

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[SMTChecker] Allow constructing symbolic arrays from smt sort
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Leonardo 2020-04-06 12:26:30 +02:00 committed by GitHub
commit 0a72a3b8af
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2 changed files with 22 additions and 0 deletions
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13
libsolidity/formal/SymbolicVariables.cpp
View File

@ -218,15 +218,28 @@ SymbolicArrayVariable::SymbolicArrayVariable(
solAssert(isArray(m_type->category()), "");
}
SymbolicArrayVariable::SymbolicArrayVariable(
SortPointer _sort,
string _uniqueName,
EncodingContext& _context
):
SymbolicVariable(move(_sort), move(_uniqueName), _context)
{
solAssert(m_sort->kind == Kind::Array, "");
}
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)));
}
return SymbolicVariable::currentValue(_targetType);
}

9
libsolidity/formal/SymbolicVariables.h
View File

@ -47,6 +47,8 @@ public:
EncodingContext& _context
);
SymbolicVariable(SymbolicVariable&&) = default;
virtual ~SymbolicVariable() = default;
virtual Expression currentValue(frontend::TypePointer const& _targetType = TypePointer{}) const;
@ -212,6 +214,13 @@ public:
std::string _uniqueName,
EncodingContext& _context
);
SymbolicArrayVariable(
SortPointer _sort,
std::string _uniqueName,
EncodingContext& _context
);
SymbolicArrayVariable(SymbolicArrayVariable&&) = default;
Expression currentValue(frontend::TypePointer const& _targetType = TypePointer{}) const override;
};