solidity/libyul/optimiser/TypeInfo.cpp
2020-04-02 18:00:44 -05:00

104 lines
2.8 KiB
C++

/*
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/>.
*/
/**
* Helper class that keeps track of the types while performing optimizations.
*/
#include <libyul/optimiser/TypeInfo.h>
#include <libyul/optimiser/NameCollector.h>
#include <libyul/AsmData.h>
#include <libyul/Dialect.h>
#include <libsolutil/Visitor.h>
using namespace std;
using namespace solidity::yul;
using namespace solidity::util;
class TypeInfo::TypeCollector: public ASTWalker
{
public:
explicit TypeCollector(Block const& _block)
{
(*this)(_block);
}
using ASTWalker::operator();
void operator()(VariableDeclaration const& _varDecl) override
{
for (auto const& var: _varDecl.variables)
variableTypes[var.name] = var.type;
}
void operator()(FunctionDefinition const& _funDef) override
{
ASTWalker::operator()(_funDef);
auto& funType = functionTypes[_funDef.name];
for (auto const& arg: _funDef.parameters)
{
funType.parameters.emplace_back(arg.type);
variableTypes[arg.name] = arg.type;
}
for (auto const& ret: _funDef.returnVariables)
{
funType.returns.emplace_back(ret.type);
variableTypes[ret.name] = ret.type;
}
}
std::map<YulString, YulString> variableTypes;
std::map<YulString, FunctionType> functionTypes;
};
TypeInfo::TypeInfo(Dialect const& _dialect, Block const& _ast):
m_dialect(_dialect)
{
TypeCollector types(_ast);
m_functionTypes = std::move(types.functionTypes);
m_variableTypes = std::move(types.variableTypes);
}
YulString TypeInfo::typeOf(Expression const& _expression) const
{
return std::visit(GenericVisitor{
[&](FunctionCall const& _funCall) {
YulString name = _funCall.functionName.name;
vector<YulString> const* retTypes = nullptr;
if (BuiltinFunction const* fun = m_dialect.builtin(name))
retTypes = &fun->returns;
else
retTypes = &m_functionTypes.at(name).returns;
yulAssert(retTypes && retTypes->size() == 1, "Call to typeOf for non-single-value expression.");
return retTypes->front();
},
[&](Identifier const& _identifier) {
return m_variableTypes.at(_identifier.name);
},
[&](Literal const& _literal) {
return _literal.type;
}
}, _expression);
}
YulString TypeInfo::typeOfVariable(YulString _name) const
{
return m_variableTypes.at(_name);
}