path: root/libyul/AsmScope.cpp

/*
    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/>.
*/
/**
 * Scopes for identifiers.
 */

#include <libyul/AsmScope.h>

using namespace std;
using namespace dev;
using namespace yul;

bool Scope::registerLabel(YulString _name)
{
    if (exists(_name))
        return false;
    identifiers[_name] = Label();
    return true;
}

bool Scope::registerVariable(YulString _name, YulType const& _type)
{
    if (exists(_name))
        return false;
    Variable variable;
    variable.type = _type;
    identifiers[_name] = variable;
    return true;
}

bool Scope::registerFunction(YulString _name, std::vector<YulType> const& _arguments, std::vector<YulType> const& _returns)
{
    if (exists(_name))
        return false;
    identifiers[_name] = Function{_arguments, _returns};
    return true;
}

Scope::Identifier* Scope::lookup(YulString _name)
{
    bool crossedFunctionBoundary = false;
    for (Scope* s = this; s; s = s->superScope)
    {
        auto id = s->identifiers.find(_name);
        if (id != s->identifiers.end())
        {
            if (crossedFunctionBoundary && id->second.type() == typeid(Scope::Variable))
                return nullptr;
            else
                return &id->second;
        }

        if (s->functionScope)
            crossedFunctionBoundary = true;
    }
    return nullptr;
}

bool Scope::exists(YulString _name) const
{
    if (identifiers.count(_name))
        return true;
    else if (superScope)
        return superScope->exists(_name);
    else
        return false;
}

size_t Scope::numberOfVariables() const
{
    size_t count = 0;
    for (auto const& identifier: identifiers)
        if (identifier.second.type() == typeid(Scope::Variable))
            count++;
    return count;
}

bool Scope::insideFunction() const
{
    for (Scope const* s = this; s; s = s->superScope)
        if (s->functionScope)
            return true;
    return false;
}