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/*
This file is part of cpp-ethereum.
cpp-ethereum 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.
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2014
* Parser part that determines the declarations corresponding to names and the types of expressions.
*/
#include <libsolidity/NameAndTypeResolver.h>
#include <libsolidity/AST.h>
#include <boost/assert.hpp>
namespace dev {
namespace solidity {
class NameAndTypeResolver::ScopeHelper {
public:
ScopeHelper(NameAndTypeResolver& _resolver, Declaration& _declaration)
: m_resolver(_resolver)
{
m_resolver.registerDeclaration(_declaration);
m_resolver.enterNewSubScope(_declaration);
}
~ScopeHelper()
{
m_resolver.closeCurrentScope();
}
private:
NameAndTypeResolver& m_resolver;
};
NameAndTypeResolver::NameAndTypeResolver()
{
}
void NameAndTypeResolver::resolveNamesAndTypes(ContractDefinition& _contract)
{
reset();
handleContract(_contract);
}
void NameAndTypeResolver::handleContract(ContractDefinition& _contract)
{
ScopeHelper scopeHelper(*this, _contract);
// @todo structs (definition and usage)
for (ptr<VariableDeclaration> const& variable : _contract.getStateVariables())
registerVariableDeclarationAndResolveType(*variable);
for (ptr<FunctionDefinition> const& function : _contract.getDefinedFunctions())
handleFunction(*function);
}
void NameAndTypeResolver::reset()
{
m_scopes.clear();
m_globalScope = Scope();
m_currentScope = &m_globalScope;
}
void NameAndTypeResolver::handleFunction(FunctionDefinition& _function)
{
ScopeHelper scopeHelper(*this, _function);
registerVariablesInFunction(_function);
resolveReferencesInFunction(*_function.getReturnParameterList(), _function.getBody());
_function.getBody().checkTypeRequirements();
}
void NameAndTypeResolver::registerVariablesInFunction(FunctionDefinition& _function)
{
class VariableDeclarationFinder : public ASTVisitor {
public:
VariableDeclarationFinder(NameAndTypeResolver& _resolver) : m_resolver(_resolver) {}
virtual bool visit(VariableDeclaration& _variable) override {
m_resolver.registerVariableDeclarationAndResolveType(_variable);
return false;
}
private:
NameAndTypeResolver& m_resolver;
};
VariableDeclarationFinder declarationFinder(*this);
_function.accept(declarationFinder);
}
void NameAndTypeResolver::resolveReferencesInFunction(ParameterList& _returnParameters,
Block& _functionBody)
{
class ReferencesResolver : public ASTVisitor {
public:
ReferencesResolver(NameAndTypeResolver& _resolver,
ParameterList& _returnParameters)
: m_resolver(_resolver), m_returnParameters(_returnParameters) {}
virtual bool visit(Identifier& _identifier) override {
Declaration* declaration = m_resolver.getNameFromCurrentScope(_identifier.getName());
if (declaration == nullptr)
throw std::exception(); // @todo
_identifier.setReferencedDeclaration(*declaration);
return false;
}
virtual bool visit(Return& _return) override {
_return.setFunctionReturnParameters(m_returnParameters);
return true;
}
private:
NameAndTypeResolver& m_resolver;
ParameterList& m_returnParameters;
};
ReferencesResolver referencesResolver(*this, _returnParameters);
_functionBody.accept(referencesResolver);
}
void NameAndTypeResolver::registerVariableDeclarationAndResolveType(VariableDeclaration& _variable)
{
registerDeclaration(_variable);
TypeName* typeName = _variable.getTypeName();
if (typeName == nullptr) // unknown type, to be resolved by first assignment
return;
// walk the AST to resolve user defined type references
// (walking is necessory because of mappings)
// @todo this could probably also be done at an earlier stage where we anyway
// walk the AST
class UserDefinedTypeNameResolver : public ASTVisitor {
public:
UserDefinedTypeNameResolver(NameAndTypeResolver& _resolver)
: m_resolver(_resolver) {}
virtual bool visit(UserDefinedTypeName& _typeName) override {
Declaration* declaration = m_resolver.getNameFromCurrentScope(_typeName.getName());
if (declaration == nullptr)
throw std::exception(); // @todo
StructDefinition* referencedStruct = dynamic_cast<StructDefinition*>(declaration);
if (referencedStruct == nullptr)
throw std::exception(); // @todo we only allow structs as user defined types (later also contracts)
_typeName.setReferencedStruct(*referencedStruct);
return false;
}
virtual bool visit(Mapping&) override {
// @todo
return true;
}
private:
NameAndTypeResolver& m_resolver;
};
UserDefinedTypeNameResolver resolver(*this);
_variable.accept(resolver);
_variable.setType(typeName->toType());
}
void NameAndTypeResolver::registerDeclaration(Declaration& _declaration)
{
if (!m_currentScope->registerDeclaration(_declaration))
throw std::exception(); // @todo
}
Declaration* NameAndTypeResolver::getNameFromCurrentScope(ASTString const& _name, bool _recursive)
{
return m_currentScope->resolveName(_name, _recursive);
}
void NameAndTypeResolver::enterNewSubScope(ASTNode& _node)
{
decltype(m_scopes)::iterator iter;
bool newlyAdded;
std::tie(iter, newlyAdded) = m_scopes.emplace(&_node, Scope(m_currentScope));
BOOST_ASSERT(newlyAdded);
m_currentScope = &iter->second;
}
void NameAndTypeResolver::closeCurrentScope()
{
m_currentScope = m_currentScope->getOuterScope();
}
} }
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