solidity/NameAndTypeResolver.cpp

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2014-10-13 13:07:21 +00:00
#include <libsolidity/NameAndTypeResolver.h>
#include <libsolidity/AST.h>
#include <boost/assert.hpp>
namespace dev {
namespace solidity {
class NameAndTypeResolver::ScopeHelper {
public:
ScopeHelper(NameAndTypeResolver& _resolver, ASTString const& _name, ASTNode& _declaration)
: m_resolver(_resolver)
{
m_resolver.registerName(_name, _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.getName(), _contract);
for (ptr<VariableDeclaration> const& variable : _contract.getStateVariables())
registerName(variable->getName(), *variable);
// @todo structs
for (ptr<FunctionDefinition> const& function : _contract.getDefinedFunctions())
handleFunction(*function);
// @todo resolve names used in mappings
}
void NameAndTypeResolver::reset()
{
m_scopes.clear();
m_globalScope = Scope();
m_currentScope = &m_globalScope;
}
void NameAndTypeResolver::handleFunction(FunctionDefinition& _function)
{
ScopeHelper scopeHelper(*this, _function.getName(), _function);
// @todo resolve names used in mappings
for (ptr<VariableDeclaration> const& variable : _function.getParameters())
registerName(variable->getName(), *variable);
if (_function.hasReturnParameters())
for (ptr<VariableDeclaration> const& variable : _function.getReturnParameters())
registerName(variable->getName(), *variable);
handleFunctionBody(_function.getBody());
}
void NameAndTypeResolver::handleFunctionBody(Block& _functionBody)
{
registerVariablesInFunction(_functionBody);
resolveReferencesInFunction(_functionBody);
}
void NameAndTypeResolver::registerVariablesInFunction(Block& _functionBody)
{
class VariableDeclarationFinder : public ASTVisitor {
public:
VariableDeclarationFinder(NameAndTypeResolver& _resolver) : m_resolver(_resolver) {}
virtual bool visit(VariableDeclaration& _variable) override {
m_resolver.registerName(_variable.getName(), _variable);
return false;
}
private:
NameAndTypeResolver& m_resolver;
};
VariableDeclarationFinder declarationFinder(*this);
_functionBody.accept(declarationFinder);
}
void NameAndTypeResolver::resolveReferencesInFunction(Block& _functionBody)
{
class ReferencesResolver : public ASTVisitor {
public:
ReferencesResolver(NameAndTypeResolver& _resolver) : m_resolver(_resolver) {}
virtual bool visit(Identifier& _identifier) override {
ASTNode* node = m_resolver.getNameFromCurrentScope(_identifier.getName());
if (node == nullptr)
throw std::exception(); // @todo
_identifier.setReferencedObject(*node);
return false;
}
private:
NameAndTypeResolver& m_resolver;
};
ReferencesResolver referencesResolver(*this);
_functionBody.accept(referencesResolver);
}
void NameAndTypeResolver::registerName(ASTString const& _name, ASTNode& _declaration)
{
if (!m_currentScope->registerName(_name, _declaration))
throw std::exception(); // @todo
}
ASTNode* 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();
}
} }