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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 <libsolidity/Exceptions.h>
using namespace std;
namespace dev
{
namespace solidity
{
NameAndTypeResolver::NameAndTypeResolver(std::vector<Declaration*> const& _globals)
{
for (Declaration* declaration: _globals)
m_scopes[nullptr].registerDeclaration(*declaration);
}
void NameAndTypeResolver::resolveNamesAndTypes(ContractDefinition& _contract)
{
DeclarationRegistrationHelper registrar(m_scopes, _contract);
m_currentScope = &m_scopes[&_contract];
for (ASTPointer<StructDefinition> const& structDef: _contract.getDefinedStructs())
ReferencesResolver resolver(*structDef, *this, nullptr);
for (ASTPointer<StructDefinition> const& structDef: _contract.getDefinedStructs())
structDef->checkValidityOfMembers();
for (ASTPointer<VariableDeclaration> const& variable: _contract.getStateVariables())
ReferencesResolver resolver(*variable, *this, nullptr);
for (ASTPointer<FunctionDefinition> const& function: _contract.getDefinedFunctions())
{
m_currentScope = &m_scopes[function.get()];
ReferencesResolver referencesResolver(*function, *this,
function->getReturnParameterList().get());
}
// First, the parameter types of all functions need to be resolved before we can check
// the types, since it is possible to call functions that are only defined later
// in the source.
for (ASTPointer<FunctionDefinition> const& function: _contract.getDefinedFunctions())
{
m_currentScope = &m_scopes[function.get()];
function->checkTypeRequirements();
}
m_currentScope = &m_scopes[nullptr];
}
Declaration* NameAndTypeResolver::resolveName(ASTString const& _name, Declaration const* _scope) const
{
auto iterator = m_scopes.find(_scope);
if (iterator == end(m_scopes))
return nullptr;
return iterator->second.resolveName(_name, false);
}
Declaration* NameAndTypeResolver::getNameFromCurrentScope(ASTString const& _name, bool _recursive)
{
return m_currentScope->resolveName(_name, _recursive);
}
DeclarationRegistrationHelper::DeclarationRegistrationHelper(map<ASTNode const*, Scope>& _scopes,
ASTNode& _astRoot):
m_scopes(_scopes), m_currentScope(&m_scopes[nullptr])
{
_astRoot.accept(*this);
}
bool DeclarationRegistrationHelper::visit(ContractDefinition& _contract)
{
registerDeclaration(_contract, true);
return true;
}
void DeclarationRegistrationHelper::endVisit(ContractDefinition&)
{
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(StructDefinition& _struct)
{
registerDeclaration(_struct, true);
return true;
}
void DeclarationRegistrationHelper::endVisit(StructDefinition&)
{
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(FunctionDefinition& _function)
{
registerDeclaration(_function, true);
m_currentFunction = &_function;
return true;
}
void DeclarationRegistrationHelper::endVisit(FunctionDefinition&)
{
m_currentFunction = nullptr;
closeCurrentScope();
}
void DeclarationRegistrationHelper::endVisit(VariableDefinition& _variableDefinition)
{
// Register the local variables with the function
// This does not fit here perfectly, but it saves us another AST visit.
if (asserts(m_currentFunction))
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Variable definition without function."));
m_currentFunction->addLocalVariable(_variableDefinition.getDeclaration());
}
bool DeclarationRegistrationHelper::visit(VariableDeclaration& _declaration)
{
registerDeclaration(_declaration, false);
return true;
}
void DeclarationRegistrationHelper::enterNewSubScope(ASTNode& _node)
{
map<ASTNode const*, Scope>::iterator iter;
bool newlyAdded;
tie(iter, newlyAdded) = m_scopes.emplace(&_node, Scope(m_currentScope));
if (asserts(newlyAdded))
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unable to add new scope."));
m_currentScope = &iter->second;
}
void DeclarationRegistrationHelper::closeCurrentScope()
{
if (asserts(m_currentScope))
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Closed non-existing scope."));
m_currentScope = m_currentScope->getEnclosingScope();
}
void DeclarationRegistrationHelper::registerDeclaration(Declaration& _declaration, bool _opensScope)
{
if (asserts(m_currentScope))
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Declaration registered without scope."));
if (!m_currentScope->registerDeclaration(_declaration))
BOOST_THROW_EXCEPTION(DeclarationError() << errinfo_sourceLocation(_declaration.getLocation())
<< errinfo_comment("Identifier already declared."));
//@todo the exception should also contain the location of the first declaration
if (_opensScope)
enterNewSubScope(_declaration);
}
ReferencesResolver::ReferencesResolver(ASTNode& _root, NameAndTypeResolver& _resolver,
ParameterList* _returnParameters, bool _allowLazyTypes):
m_resolver(_resolver), m_returnParameters(_returnParameters), m_allowLazyTypes(_allowLazyTypes)
{
_root.accept(*this);
}
void ReferencesResolver::endVisit(VariableDeclaration& _variable)
{
// endVisit because the internal type needs resolving if it is a user defined type
// or mapping
if (_variable.getTypeName())
{
_variable.setType(_variable.getTypeName()->toType());
if (!_variable.getType())
BOOST_THROW_EXCEPTION(_variable.getTypeName()->createTypeError("Invalid type name"));
}
else if (!m_allowLazyTypes)
BOOST_THROW_EXCEPTION(_variable.createTypeError("Explicit type needed."));
// otherwise we have a "var"-declaration whose type is resolved by the first assignment
}
bool ReferencesResolver::visit(Return& _return)
{
if (asserts(m_returnParameters))
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Return parameters not set."));
_return.setFunctionReturnParameters(*m_returnParameters);
return true;
}
bool ReferencesResolver::visit(Mapping& _mapping)
{
(void)_mapping;
return true;
}
bool ReferencesResolver::visit(UserDefinedTypeName& _typeName)
{
Declaration* declaration = m_resolver.getNameFromCurrentScope(_typeName.getName());
if (!declaration)
BOOST_THROW_EXCEPTION(DeclarationError() << errinfo_sourceLocation(_typeName.getLocation())
<< errinfo_comment("Undeclared identifier."));
_typeName.setReferencedDeclaration(*declaration);
return false;
}
bool ReferencesResolver::visit(Identifier& _identifier)
{
Declaration* declaration = m_resolver.getNameFromCurrentScope(_identifier.getName());
if (!declaration)
BOOST_THROW_EXCEPTION(DeclarationError() << errinfo_sourceLocation(_identifier.getLocation())
<< errinfo_comment("Undeclared identifier."));
_identifier.setReferencedDeclaration(*declaration);
return false;
}
}
}
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