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/*
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/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2014
* Parser part that determines the declarations corresponding to names and the types of expressions.
*/
#include <libsolidity/analysis/NameAndTypeResolver.h>
#include <libsolidity/ast/AST.h>
#include <libsolidity/analysis/TypeChecker.h>
#include <libsolidity/interface/ErrorReporter.h>
#include <libdevcore/StringUtils.h>
#include <boost/algorithm/string.hpp>
using namespace std;
namespace dev
{
namespace solidity
{
NameAndTypeResolver::NameAndTypeResolver(
vector<Declaration const*> const& _globals,
map<ASTNode const*, shared_ptr<DeclarationContainer>>& _scopes,
ErrorReporter& _errorReporter
) :
m_scopes(_scopes),
m_errorReporter(_errorReporter)
{
if (!m_scopes[nullptr])
m_scopes[nullptr].reset(new DeclarationContainer());
for (Declaration const* declaration: _globals)
m_scopes[nullptr]->registerDeclaration(*declaration);
}
bool NameAndTypeResolver::registerDeclarations(SourceUnit& _sourceUnit, ASTNode const* _currentScope)
{
bool useC99Scoping = _sourceUnit.annotation().experimentalFeatures.count(ExperimentalFeature::V050);
// The helper registers all declarations in m_scopes as a side-effect of its construction.
try
{
DeclarationRegistrationHelper registrar(m_scopes, _sourceUnit, useC99Scoping, m_errorReporter, _currentScope);
}
catch (FatalError const&)
{
if (m_errorReporter.errors().empty())
throw; // Something is weird here, rather throw again.
return false;
}
return true;
}
bool NameAndTypeResolver::performImports(SourceUnit& _sourceUnit, map<string, SourceUnit const*> const& _sourceUnits)
{
DeclarationContainer& target = *m_scopes.at(&_sourceUnit);
bool error = false;
for (auto const& node: _sourceUnit.nodes())
if (auto imp = dynamic_cast<ImportDirective const*>(node.get()))
{
string const& path = imp->annotation().absolutePath;
if (!_sourceUnits.count(path))
{
m_errorReporter.declarationError(
imp->location(),
"Import \"" + path + "\" (referenced as \"" + imp->path() + "\") not found."
);
error = true;
continue;
}
auto scope = m_scopes.find(_sourceUnits.at(path));
solAssert(scope != end(m_scopes), "");
if (!imp->symbolAliases().empty())
for (auto const& alias: imp->symbolAliases())
{
auto declarations = scope->second->resolveName(alias.first->name(), false);
if (declarations.empty())
{
m_errorReporter.declarationError(
imp->location(),
"Declaration \"" +
alias.first->name() +
"\" not found in \"" +
path +
"\" (referenced as \"" +
imp->path() +
"\")."
);
error = true;
}
else
for (Declaration const* declaration: declarations)
if (!DeclarationRegistrationHelper::registerDeclaration(
target, *declaration, alias.second.get(), &imp->location(), true, false, m_errorReporter
))
error = true;
}
else if (imp->name().empty())
for (auto const& nameAndDeclaration: scope->second->declarations())
for (auto const& declaration: nameAndDeclaration.second)
if (!DeclarationRegistrationHelper::registerDeclaration(
target, *declaration, &nameAndDeclaration.first, &imp->location(), true, false, m_errorReporter
))
error = true;
}
return !error;
}
bool NameAndTypeResolver::resolveNamesAndTypes(ASTNode& _node, bool _resolveInsideCode)
{
try
{
return resolveNamesAndTypesInternal(_node, _resolveInsideCode);
}
catch (FatalError const&)
{
if (m_errorReporter.errors().empty())
throw; // Something is weird here, rather throw again.
return false;
}
}
bool NameAndTypeResolver::updateDeclaration(Declaration const& _declaration)
{
try
{
m_scopes[nullptr]->registerDeclaration(_declaration, nullptr, false, true);
solAssert(_declaration.scope() == nullptr, "Updated declaration outside global scope.");
}
catch (FatalError const&)
{
if (m_errorReporter.errors().empty())
throw; // Something is weird here, rather throw again.
return false;
}
return true;
}
void NameAndTypeResolver::activateVariable(string const& _name)
{
solAssert(m_currentScope, "");
m_currentScope->activateVariable(_name);
}
vector<Declaration const*> NameAndTypeResolver::resolveName(ASTString const& _name, ASTNode const* _scope) const
{
auto iterator = m_scopes.find(_scope);
if (iterator == end(m_scopes))
return vector<Declaration const*>({});
return iterator->second->resolveName(_name, false);
}
vector<Declaration const*> NameAndTypeResolver::nameFromCurrentScope(ASTString const& _name, bool _includeInvisibles) const
{
return m_currentScope->resolveName(_name, true, _includeInvisibles);
}
Declaration const* NameAndTypeResolver::pathFromCurrentScope(vector<ASTString> const& _path) const
{
solAssert(!_path.empty(), "");
vector<Declaration const*> candidates = m_currentScope->resolveName(_path.front(), true);
for (size_t i = 1; i < _path.size() && candidates.size() == 1; i++)
{
if (!m_scopes.count(candidates.front()))
return nullptr;
candidates = m_scopes.at(candidates.front())->resolveName(_path[i], false);
}
if (candidates.size() == 1)
return candidates.front();
else
return nullptr;
}
vector<Declaration const*> NameAndTypeResolver::cleanedDeclarations(
Identifier const& _identifier,
vector<Declaration const*> const& _declarations
)
{
solAssert(_declarations.size() > 1, "");
vector<Declaration const*> uniqueFunctions;
for (Declaration const* declaration: _declarations)
{
solAssert(declaration, "");
// the declaration is functionDefinition, eventDefinition or a VariableDeclaration while declarations > 1
solAssert(
dynamic_cast<FunctionDefinition const*>(declaration) ||
dynamic_cast<EventDefinition const*>(declaration) ||
dynamic_cast<VariableDeclaration const*>(declaration) ||
dynamic_cast<MagicVariableDeclaration const*>(declaration),
"Found overloading involving something not a function, event or a (magic) variable."
);
FunctionTypePointer functionType { declaration->functionType(false) };
if (!functionType)
functionType = declaration->functionType(true);
solAssert(functionType, "Failed to determine the function type of the overloaded.");
for (auto parameter: functionType->parameterTypes() + functionType->returnParameterTypes())
if (!parameter)
m_errorReporter.fatalDeclarationError(_identifier.location(), "Function type can not be used in this context.");
if (uniqueFunctions.end() == find_if(
uniqueFunctions.begin(),
uniqueFunctions.end(),
[&](Declaration const* d)
{
shared_ptr<FunctionType const> newFunctionType { d->functionType(false) };
if (!newFunctionType)
newFunctionType = d->functionType(true);
return newFunctionType && functionType->hasEqualArgumentTypes(*newFunctionType);
}
))
uniqueFunctions.push_back(declaration);
}
return uniqueFunctions;
}
void NameAndTypeResolver::warnVariablesNamedLikeInstructions()
{
for (auto const& instruction: c_instructions)
{
string const instructionName{boost::algorithm::to_lower_copy(instruction.first)};
auto declarations = nameFromCurrentScope(instructionName, true);
for (Declaration const* const declaration: declarations)
{
solAssert(!!declaration, "");
if (dynamic_cast<MagicVariableDeclaration const* const>(declaration))
// Don't warn the user for what the user did not.
continue;
m_errorReporter.warning(
declaration->location(),
"Variable is shadowed in inline assembly by an instruction of the same name"
);
}
}
}
void NameAndTypeResolver::setScope(ASTNode const* _node)
{
m_currentScope = m_scopes[_node].get();
}
bool NameAndTypeResolver::resolveNamesAndTypesInternal(ASTNode& _node, bool _resolveInsideCode)
{
if (ContractDefinition* contract = dynamic_cast<ContractDefinition*>(&_node))
{
bool success = true;
setScope(contract->scope());
solAssert(!!m_currentScope, "");
for (ASTPointer<InheritanceSpecifier> const& baseContract: contract->baseContracts())
if (!resolveNamesAndTypes(*baseContract, true))
success = false;
setScope(contract);
if (success)
{
linearizeBaseContracts(*contract);
vector<ContractDefinition const*> properBases(
++contract->annotation().linearizedBaseContracts.begin(),
contract->annotation().linearizedBaseContracts.end()
);
for (ContractDefinition const* base: properBases)
importInheritedScope(*base);
}
// these can contain code, only resolve parameters for now
for (ASTPointer<ASTNode> const& node: contract->subNodes())
{
setScope(contract);
if (!resolveNamesAndTypes(*node, false))
{
success = false;
break;
}
}
if (!success)
return false;
if (!_resolveInsideCode)
return success;
setScope(contract);
// now resolve references inside the code
for (ASTPointer<ASTNode> const& node: contract->subNodes())
{
setScope(contract);
if (!resolveNamesAndTypes(*node, true))
success = false;
}
return success;
}
else
{
if (m_scopes.count(&_node))
setScope(&_node);
return ReferencesResolver(m_errorReporter, *this, _resolveInsideCode).resolve(_node);
}
}
void NameAndTypeResolver::importInheritedScope(ContractDefinition const& _base)
{
auto iterator = m_scopes.find(&_base);
solAssert(iterator != end(m_scopes), "");
for (auto const& nameAndDeclaration: iterator->second->declarations())
for (auto const& declaration: nameAndDeclaration.second)
// Import if it was declared in the base, is not the constructor and is visible in derived classes
if (declaration->scope() == &_base && declaration->isVisibleInDerivedContracts())
if (!m_currentScope->registerDeclaration(*declaration))
{
SourceLocation firstDeclarationLocation;
SourceLocation secondDeclarationLocation;
Declaration const* conflictingDeclaration = m_currentScope->conflictingDeclaration(*declaration);
solAssert(conflictingDeclaration, "");
// Usual shadowing is not an error
if (dynamic_cast<VariableDeclaration const*>(declaration) && dynamic_cast<VariableDeclaration const*>(conflictingDeclaration))
continue;
// Usual shadowing is not an error
if (dynamic_cast<ModifierDefinition const*>(declaration) && dynamic_cast<ModifierDefinition const*>(conflictingDeclaration))
continue;
if (declaration->location().start < conflictingDeclaration->location().start)
{
firstDeclarationLocation = declaration->location();
secondDeclarationLocation = conflictingDeclaration->location();
}
else
{
firstDeclarationLocation = conflictingDeclaration->location();
secondDeclarationLocation = declaration->location();
}
m_errorReporter.declarationError(
secondDeclarationLocation,
SecondarySourceLocation().append("The previous declaration is here:", firstDeclarationLocation),
"Identifier already declared."
);
}
}
void NameAndTypeResolver::linearizeBaseContracts(ContractDefinition& _contract)
{
// order in the lists is from derived to base
// list of lists to linearize, the last element is the list of direct bases
list<list<ContractDefinition const*>> input(1, list<ContractDefinition const*>{});
for (ASTPointer<InheritanceSpecifier> const& baseSpecifier: _contract.baseContracts())
{
UserDefinedTypeName const& baseName = baseSpecifier->name();
auto base = dynamic_cast<ContractDefinition const*>(baseName.annotation().referencedDeclaration);
if (!base)
m_errorReporter.fatalTypeError(baseName.location(), "Contract expected.");
// "push_front" has the effect that bases mentioned later can overwrite members of bases
// mentioned earlier
input.back().push_front(base);
vector<ContractDefinition const*> const& basesBases = base->annotation().linearizedBaseContracts;
if (basesBases.empty())
m_errorReporter.fatalTypeError(baseName.location(), "Definition of base has to precede definition of derived contract");
input.push_front(list<ContractDefinition const*>(basesBases.begin(), basesBases.end()));
}
input.back().push_front(&_contract);
vector<ContractDefinition const*> result = cThreeMerge(input);
if (result.empty())
m_errorReporter.fatalTypeError(_contract.location(), "Linearization of inheritance graph impossible");
_contract.annotation().linearizedBaseContracts = result;
_contract.annotation().contractDependencies.insert(result.begin() + 1, result.end());
}
template <class _T>
vector<_T const*> NameAndTypeResolver::cThreeMerge(list<list<_T const*>>& _toMerge)
{
// returns true iff _candidate appears only as last element of the lists
auto appearsOnlyAtHead = [&](_T const* _candidate) -> bool
{
for (list<_T const*> const& bases: _toMerge)
{
solAssert(!bases.empty(), "");
if (find(++bases.begin(), bases.end(), _candidate) != bases.end())
return false;
}
return true;
};
// returns the next candidate to append to the linearized list or nullptr on failure
auto nextCandidate = [&]() -> _T const*
{
for (list<_T const*> const& bases: _toMerge)
{
solAssert(!bases.empty(), "");
if (appearsOnlyAtHead(bases.front()))
return bases.front();
}
return nullptr;
};
// removes the given contract from all lists
auto removeCandidate = [&](_T const* _candidate)
{
for (auto it = _toMerge.begin(); it != _toMerge.end();)
{
it->remove(_candidate);
if (it->empty())
it = _toMerge.erase(it);
else
++it;
}
};
_toMerge.remove_if([](list<_T const*> const& _bases) { return _bases.empty(); });
vector<_T const*> result;
while (!_toMerge.empty())
{
_T const* candidate = nextCandidate();
if (!candidate)
return vector<_T const*>();
result.push_back(candidate);
removeCandidate(candidate);
}
return result;
}
string NameAndTypeResolver::similarNameSuggestions(ASTString const& _name) const
{
return quotedAlternativesList(m_currentScope->similarNames(_name));
}
DeclarationRegistrationHelper::DeclarationRegistrationHelper(
map<ASTNode const*, shared_ptr<DeclarationContainer>>& _scopes,
ASTNode& _astRoot,
bool _useC99Scoping,
ErrorReporter& _errorReporter,
ASTNode const* _currentScope
):
m_useC99Scoping(_useC99Scoping),
m_scopes(_scopes),
m_currentScope(_currentScope),
m_errorReporter(_errorReporter)
{
_astRoot.accept(*this);
solAssert(m_currentScope == _currentScope, "Scopes not correctly closed.");
}
bool DeclarationRegistrationHelper::registerDeclaration(
DeclarationContainer& _container,
Declaration const& _declaration,
string const* _name,
SourceLocation const* _errorLocation,
bool _warnOnShadow,
bool _inactive,
ErrorReporter& _errorReporter
)
{
if (!_errorLocation)
_errorLocation = &_declaration.location();
string name = _name ? *_name : _declaration.name();
Declaration const* shadowedDeclaration = nullptr;
if (_warnOnShadow && !name.empty() && _container.enclosingContainer())
for (auto const* decl: _container.enclosingContainer()->resolveName(name, true, true))
shadowedDeclaration = decl;
// We use "invisible" for both inactive variables in blocks and for members invisible in contracts.
// They cannot both be true at the same time.
solAssert(!(_inactive && !_declaration.isVisibleInContract()), "");
if (!_container.registerDeclaration(_declaration, _name, !_declaration.isVisibleInContract() || _inactive))
{
SourceLocation firstDeclarationLocation;
SourceLocation secondDeclarationLocation;
Declaration const* conflictingDeclaration = _container.conflictingDeclaration(_declaration, _name);
solAssert(conflictingDeclaration, "");
bool const comparable =
_errorLocation->sourceName &&
conflictingDeclaration->location().sourceName &&
*_errorLocation->sourceName == *conflictingDeclaration->location().sourceName;
if (comparable && _errorLocation->start < conflictingDeclaration->location().start)
{
firstDeclarationLocation = *_errorLocation;
secondDeclarationLocation = conflictingDeclaration->location();
}
else
{
firstDeclarationLocation = conflictingDeclaration->location();
secondDeclarationLocation = *_errorLocation;
}
_errorReporter.declarationError(
secondDeclarationLocation,
SecondarySourceLocation().append("The previous declaration is here:", firstDeclarationLocation),
"Identifier already declared."
);
return false;
}
else if (shadowedDeclaration)
{
if (dynamic_cast<MagicVariableDeclaration const*>(shadowedDeclaration))
_errorReporter.warning(
_declaration.location(),
"This declaration shadows a builtin symbol."
);
else
{
auto shadowedLocation = shadowedDeclaration->location();
_errorReporter.warning(
_declaration.location(),
"This declaration shadows an existing declaration.",
SecondarySourceLocation().append("The shadowed declaration is here:", shadowedLocation)
);
}
}
return true;
}
bool DeclarationRegistrationHelper::visit(SourceUnit& _sourceUnit)
{
if (!m_scopes[&_sourceUnit])
// By importing, it is possible that the container already exists.
m_scopes[&_sourceUnit].reset(new DeclarationContainer(m_currentScope, m_scopes[m_currentScope].get()));
m_currentScope = &_sourceUnit;
return true;
}
void DeclarationRegistrationHelper::endVisit(SourceUnit& _sourceUnit)
{
_sourceUnit.annotation().exportedSymbols = m_scopes[&_sourceUnit]->declarations();
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(ImportDirective& _import)
{
SourceUnit const* importee = _import.annotation().sourceUnit;
solAssert(!!importee, "");
if (!m_scopes[importee])
m_scopes[importee].reset(new DeclarationContainer(nullptr, m_scopes[nullptr].get()));
m_scopes[&_import] = m_scopes[importee];
registerDeclaration(_import, false);
return true;
}
bool DeclarationRegistrationHelper::visit(ContractDefinition& _contract)
{
registerDeclaration(_contract, true);
_contract.annotation().canonicalName = currentCanonicalName();
return true;
}
void DeclarationRegistrationHelper::endVisit(ContractDefinition&)
{
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(StructDefinition& _struct)
{
registerDeclaration(_struct, true);
_struct.annotation().canonicalName = currentCanonicalName();
return true;
}
void DeclarationRegistrationHelper::endVisit(StructDefinition&)
{
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(EnumDefinition& _enum)
{
registerDeclaration(_enum, true);
_enum.annotation().canonicalName = currentCanonicalName();
return true;
}
void DeclarationRegistrationHelper::endVisit(EnumDefinition&)
{
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(EnumValue& _value)
{
registerDeclaration(_value, false);
return true;
}
bool DeclarationRegistrationHelper::visit(FunctionDefinition& _function)
{
registerDeclaration(_function, true);
m_currentFunction = &_function;
return true;
}
void DeclarationRegistrationHelper::endVisit(FunctionDefinition&)
{
m_currentFunction = nullptr;
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(ModifierDefinition& _modifier)
{
registerDeclaration(_modifier, true);
m_currentFunction = &_modifier;
return true;
}
void DeclarationRegistrationHelper::endVisit(ModifierDefinition&)
{
m_currentFunction = nullptr;
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(Block& _block)
{
_block.setScope(m_currentScope);
if (m_useC99Scoping)
enterNewSubScope(_block);
return true;
}
void DeclarationRegistrationHelper::endVisit(Block&)
{
if (m_useC99Scoping)
closeCurrentScope();
}
bool DeclarationRegistrationHelper::visit(ForStatement& _for)
{
_for.setScope(m_currentScope);
if (m_useC99Scoping)
enterNewSubScope(_for);
return true;
}
void DeclarationRegistrationHelper::endVisit(ForStatement&)
{
if (m_useC99Scoping)
closeCurrentScope();
}
void DeclarationRegistrationHelper::endVisit(VariableDeclarationStatement& _variableDeclarationStatement)
{
// Register the local variables with the function
// This does not fit here perfectly, but it saves us another AST visit.
solAssert(m_currentFunction, "Variable declaration without function.");
for (ASTPointer<VariableDeclaration> const& var: _variableDeclarationStatement.declarations())
if (var)
m_currentFunction->addLocalVariable(*var);
}
bool DeclarationRegistrationHelper::visit(VariableDeclaration& _declaration)
{
registerDeclaration(_declaration, false);
return true;
}
bool DeclarationRegistrationHelper::visit(EventDefinition& _event)
{
registerDeclaration(_event, true);
return true;
}
void DeclarationRegistrationHelper::endVisit(EventDefinition&)
{
closeCurrentScope();
}
void DeclarationRegistrationHelper::enterNewSubScope(ASTNode& _subScope)
{
map<ASTNode const*, shared_ptr<DeclarationContainer>>::iterator iter;
bool newlyAdded;
shared_ptr<DeclarationContainer> container(new DeclarationContainer(m_currentScope, m_scopes[m_currentScope].get()));
tie(iter, newlyAdded) = m_scopes.emplace(&_subScope, move(container));
solAssert(newlyAdded, "Unable to add new scope.");
m_currentScope = &_subScope;
}
void DeclarationRegistrationHelper::closeCurrentScope()
{
solAssert(m_currentScope && m_scopes.count(m_currentScope), "Closed non-existing scope.");
m_currentScope = m_scopes[m_currentScope]->enclosingNode();
}
void DeclarationRegistrationHelper::registerDeclaration(Declaration& _declaration, bool _opensScope)
{
solAssert(m_currentScope && m_scopes.count(m_currentScope), "No current scope.");
bool warnAboutShadowing = true;
// Do not warn about shadowing for structs and enums because their members are
// not accessible without prefixes. Also do not warn about event parameters
// because they don't participate in any proper scope.
if (
dynamic_cast<StructDefinition const*>(m_currentScope) ||
dynamic_cast<EnumDefinition const*>(m_currentScope) ||
dynamic_cast<EventDefinition const*>(m_currentScope)
)
warnAboutShadowing = false;
// Do not warn about the constructor shadowing the contract.
if (auto fun = dynamic_cast<FunctionDefinition const*>(&_declaration))
if (fun->isConstructor())
warnAboutShadowing = false;
// Register declaration as inactive if we are in block scope and C99 mode.
bool inactive =
m_useC99Scoping &&
(dynamic_cast<Block const*>(m_currentScope) || dynamic_cast<ForStatement const*>(m_currentScope));
registerDeclaration(*m_scopes[m_currentScope], _declaration, nullptr, nullptr, warnAboutShadowing, inactive, m_errorReporter);
_declaration.setScope(m_currentScope);
if (_opensScope)
enterNewSubScope(_declaration);
}
string DeclarationRegistrationHelper::currentCanonicalName() const
{
string ret;
for (
ASTNode const* scope = m_currentScope;
scope != nullptr;
scope = m_scopes[scope]->enclosingNode()
)
{
if (auto decl = dynamic_cast<Declaration const*>(scope))
{
if (!ret.empty())
ret = "." + ret;
ret = decl->name() + ret;
}
}
return ret;
}
}
}
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