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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/>.
*/
/**
* Analyzer part of inline assembly.
*/
#include <libsolidity/inlineasm/AsmAnalysis.h>
#include <libsolidity/inlineasm/AsmData.h>
#include <libsolidity/interface/Exceptions.h>
#include <libsolidity/interface/Utils.h>
#include <boost/range/adaptor/reversed.hpp>
#include <memory>
#include <functional>
using namespace std;
using namespace dev;
using namespace dev::solidity;
using namespace dev::solidity::assembly;
bool Scope::registerLabel(const string& _name, size_t _id)
{
if (lookup(_name))
return false;
identifiers[_name] = Scope::Label(_id);
return true;
}
bool Scope::registerVariable(const string& _name)
{
if (lookup(_name))
return false;
identifiers[_name] = Variable();
return true;
}
Scope::Identifier* Scope::lookup(string const& _name)
{
if (identifiers.count(_name))
return &identifiers[_name];
else if (superScope)
return superScope->lookup(_name);
else
return nullptr;
}
AsmAnalyzer::AsmAnalyzer(AsmAnalyzer::Scopes& _scopes, ErrorList& _errors):
m_scopes(_scopes), m_errors(_errors)
{
// Make the Solidity ErrorTag available to inline assembly
m_scopes[nullptr] = make_shared<Scope>();
m_scopes[nullptr]->identifiers["invalidJumpLabel"] = Scope::Label(Scope::Label::errorLabelId);
m_currentScope = m_scopes[nullptr].get();
}
bool AsmAnalyzer::operator()(assembly::Literal const& _literal)
{
if (!_literal.isNumber && _literal.value.size() > 32)
{
m_errors.push_back(make_shared<Error>(
Error::Type::TypeError,
"string literal too long (" + boost::lexical_cast<std::string>(_literal.value.size()) + " > 32)"
));
return false;
}
return true;
}
bool AsmAnalyzer::operator()(FunctionalInstruction const& _instr)
{
bool success = true;
for (auto const& arg: _instr.arguments | boost::adaptors::reversed)
if (!boost::apply_visitor(*this, arg))
success = false;
if (!(*this)(_instr.instruction))
success = false;
return success;
}
bool AsmAnalyzer::operator()(Label const& _item)
{
if (!m_currentScope->registerLabel(_item.name, Scope::Label::unassignedLabelId))
{
//@TODO secondary location
m_errors.push_back(make_shared<Error>(
Error::Type::DeclarationError,
"Label name " + _item.name + " already taken in this scope.",
_item.location
));
return false;
}
bool success = true;
if (!_item.stackInfo.empty())
{
Scope::Label& label = boost::get<Scope::Label>(m_currentScope->identifiers[_item.name]);
if (_item.stackInfo.size() == 1)
try
{
label.stackAdjustment = boost::lexical_cast<int>(_item.stackInfo[0]);
label.resetStackHeight = false;
return true;
}
catch (boost::bad_lexical_cast const&)
{
// Interpret as variable name
}
label.resetStackHeight = true;
for (auto const& stackItem: _item.stackInfo)
{
if (!m_currentScope->registerVariable(stackItem))
{
//@TODO secondary location
m_errors.push_back(make_shared<Error>(
Error::Type::DeclarationError,
"Variable name " + stackItem + " already taken in this scope.",
_item.location
));
success = false;
}
}
}
return success;
}
bool AsmAnalyzer::operator()(const FunctionalAssignment& _assignment)
{
return boost::apply_visitor(*this, *_assignment.value);
}
bool AsmAnalyzer::operator()(assembly::VariableDeclaration const& _varDecl)
{
bool success = boost::apply_visitor(*this, *_varDecl.value);
if (!m_currentScope->registerVariable(_varDecl.name))
{
//@TODO secondary location
m_errors.push_back(make_shared<Error>(
Error::Type::DeclarationError,
"Variable name " + _varDecl.name + " already taken in this scope.",
_varDecl.location
));
success = false;
}
return success;
}
bool AsmAnalyzer::operator()(Block const& _block)
{
bool success = true;
auto scope = make_shared<Scope>();
scope->superScope = m_currentScope;
m_scopes[&_block] = scope;
m_currentScope = scope.get();
for (auto const& s: _block.statements)
if (!boost::apply_visitor(*this, s))
success = false;
m_currentScope = m_currentScope->superScope;
return success;
}
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