solidity/libsolidity/formal/SymbolicVariables.cpp

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/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libsolidity/formal/SymbolicVariables.h>
#include <libsolidity/formal/SymbolicTypes.h>
#include <libsolidity/ast/AST.h>
using namespace std;
using namespace dev;
using namespace dev::solidity::smt;
SymbolicVariable::SymbolicVariable(
solidity::TypePointer _type,
solidity::TypePointer _originalType,
string _uniqueName,
EncodingContext& _context
):
m_type(_type),
m_originalType(_originalType),
m_uniqueName(move(_uniqueName)),
m_context(_context),
m_ssa(make_unique<SSAVariable>())
{
solAssert(m_type, "");
m_sort = smtSort(*m_type);
solAssert(m_sort, "");
}
SymbolicVariable::SymbolicVariable(
SortPointer _sort,
string _uniqueName,
EncodingContext& _context
):
m_sort(move(_sort)),
m_uniqueName(move(_uniqueName)),
m_context(_context),
m_ssa(make_unique<SSAVariable>())
{
solAssert(m_sort, "");
}
Expression SymbolicVariable::currentValue(solidity::TypePointer const&) const
{
return valueAtIndex(m_ssa->index());
}
string SymbolicVariable::currentName() const
{
return uniqueSymbol(m_ssa->index());
}
Expression SymbolicVariable::valueAtIndex(int _index) const
{
return m_context.newVariable(uniqueSymbol(_index), m_sort);
}
string SymbolicVariable::nameAtIndex(int _index) const
{
return uniqueSymbol(_index);
}
string SymbolicVariable::uniqueSymbol(unsigned _index) const
{
return m_uniqueName + "_" + to_string(_index);
}
Expression SymbolicVariable::resetIndex()
{
m_ssa->resetIndex();
return currentValue();
}
Expression SymbolicVariable::increaseIndex()
{
++(*m_ssa);
return currentValue();
}
SymbolicBoolVariable::SymbolicBoolVariable(
solidity::TypePointer _type,
string _uniqueName,
EncodingContext& _context
):
SymbolicVariable(_type, _type, move(_uniqueName), _context)
{
solAssert(m_type->category() == solidity::Type::Category::Bool, "");
}
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SymbolicIntVariable::SymbolicIntVariable(
solidity::TypePointer _type,
solidity::TypePointer _originalType,
string _uniqueName,
EncodingContext& _context
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):
SymbolicVariable(_type, _originalType, move(_uniqueName), _context)
{
solAssert(isNumber(m_type->category()), "");
}
SymbolicAddressVariable::SymbolicAddressVariable(
string _uniqueName,
EncodingContext& _context
):
SymbolicIntVariable(TypeProvider::uint(160), TypeProvider::uint(160), move(_uniqueName), _context)
{
}
SymbolicFixedBytesVariable::SymbolicFixedBytesVariable(
solidity::TypePointer _originalType,
unsigned _numBytes,
string _uniqueName,
EncodingContext& _context
):
SymbolicIntVariable(TypeProvider::uint(_numBytes * 8), _originalType, move(_uniqueName), _context)
{
}
SymbolicFunctionVariable::SymbolicFunctionVariable(
solidity::TypePointer _type,
string _uniqueName,
EncodingContext& _context
):
SymbolicVariable(_type, _type, move(_uniqueName), _context),
m_declaration(m_context.newVariable(currentName(), m_sort))
{
solAssert(m_type->category() == solidity::Type::Category::Function, "");
}
SymbolicFunctionVariable::SymbolicFunctionVariable(
SortPointer _sort,
string _uniqueName,
EncodingContext& _context
):
SymbolicVariable(move(_sort), move(_uniqueName), _context),
m_declaration(m_context.newVariable(currentName(), m_sort))
{
solAssert(m_sort->kind == Kind::Function, "");
}
Expression SymbolicFunctionVariable::currentValue(solidity::TypePointer const& _targetType) const
{
return m_abstract.currentValue(_targetType);
}
Expression SymbolicFunctionVariable::currentFunctionValue() const
{
return m_declaration;
}
Expression SymbolicFunctionVariable::valueAtIndex(int _index) const
{
return m_abstract.valueAtIndex(_index);
}
Expression SymbolicFunctionVariable::functionValueAtIndex(int _index) const
{
return SymbolicVariable::valueAtIndex(_index);
}
Expression SymbolicFunctionVariable::resetIndex()
{
SymbolicVariable::resetIndex();
return m_abstract.resetIndex();
}
Expression SymbolicFunctionVariable::increaseIndex()
{
++(*m_ssa);
resetDeclaration();
m_abstract.increaseIndex();
return m_abstract.currentValue();
}
Expression SymbolicFunctionVariable::operator()(vector<Expression> _arguments) const
{
return m_declaration(_arguments);
}
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void SymbolicFunctionVariable::resetDeclaration()
{
m_declaration = m_context.newVariable(currentName(), m_sort);
}
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SymbolicMappingVariable::SymbolicMappingVariable(
solidity::TypePointer _type,
string _uniqueName,
EncodingContext& _context
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):
SymbolicVariable(_type, _type, move(_uniqueName), _context)
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{
solAssert(isMapping(m_type->category()), "");
}
SymbolicArrayVariable::SymbolicArrayVariable(
solidity::TypePointer _type,
solidity::TypePointer _originalType,
string _uniqueName,
EncodingContext& _context
):
SymbolicVariable(_type, _originalType, move(_uniqueName), _context)
{
solAssert(isArray(m_type->category()), "");
}
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Expression SymbolicArrayVariable::currentValue(solidity::TypePointer const& _targetType) const
{
if (_targetType)
// 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() == solidity::Type::Category::FixedBytes)
return smt::Expression(u256(toHex(asBytes(strType->value()), HexPrefix::Add)));
return SymbolicVariable::currentValue(_targetType);
}
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SymbolicEnumVariable::SymbolicEnumVariable(
solidity::TypePointer _type,
string _uniqueName,
EncodingContext& _context
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):
SymbolicVariable(_type, _type, move(_uniqueName), _context)
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{
solAssert(isEnum(m_type->category()), "");
}
SymbolicTupleVariable::SymbolicTupleVariable(
solidity::TypePointer _type,
string _uniqueName,
EncodingContext& _context
):
SymbolicVariable(_type, _type, move(_uniqueName), _context)
{
solAssert(isTuple(m_type->category()), "");
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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);
}