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TypeChecker.cpp
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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 <[email protected]>
* @date 2015
* Type analyzer and checker.
*/
#include <libsolidity/analysis/TypeChecker.h>
#include <memory>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/range/adaptor/reversed.hpp>
#include <libsolidity/ast/AST.h>
#include <libsolidity/inlineasm/AsmAnalysis.h>
#include <libsolidity/inlineasm/AsmAnalysisInfo.h>
#include <libsolidity/inlineasm/AsmData.h>
#include <libsolidity/interface/ErrorReporter.h>
using namespace std;
using namespace dev;
using namespace dev::solidity;
bool TypeChecker::checkTypeRequirements(ASTNode const& _contract)
{
try
{
_contract.accept(*this);
}
catch (FatalError const&)
{
// We got a fatal error which required to stop further type checking, but we can
// continue normally from here.
if (m_errorReporter.errors().empty())
throw; // Something is weird here, rather throw again.
}
return Error::containsOnlyWarnings(m_errorReporter.errors());
}
TypePointer const& TypeChecker::type(Expression const& _expression) const
{
solAssert(!!_expression.annotation().type, "Type requested but not present.");
return _expression.annotation().type;
}
TypePointer const& TypeChecker::type(VariableDeclaration const& _variable) const
{
solAssert(!!_variable.annotation().type, "Type requested but not present.");
return _variable.annotation().type;
}
bool TypeChecker::visit(ContractDefinition const& _contract)
{
m_scope = &_contract;
// We force our own visiting order here. The structs have to be excluded below.
set<ASTNode const*> visited;
for (auto const& s: _contract.definedStructs())
visited.insert(s);
ASTNode::listAccept(_contract.definedStructs(), *this);
ASTNode::listAccept(_contract.baseContracts(), *this);
checkContractDuplicateFunctions(_contract);
checkContractDuplicateEvents(_contract);
checkContractIllegalOverrides(_contract);
checkContractAbstractFunctions(_contract);
checkContractAbstractConstructors(_contract);
FunctionDefinition const* function = _contract.constructor();
if (function)
{
if (!function->returnParameters().empty())
m_errorReporter.typeError(function->returnParameterList()->location(), "Non-empty \"returns\" directive for constructor.");
if (function->stateMutability() != StateMutability::NonPayable && function->stateMutability() != StateMutability::Payable)
m_errorReporter.typeError(
function->location(),
"Constructor must be payable or non-payable, but is \"" +
stateMutabilityToString(function->stateMutability()) +
"\"."
);
if (function->visibility() != FunctionDefinition::Visibility::Public && function->visibility() != FunctionDefinition::Visibility::Internal)
m_errorReporter.typeError(function->location(), "Constructor must be public or internal.");
}
FunctionDefinition const* fallbackFunction = nullptr;
for (FunctionDefinition const* function: _contract.definedFunctions())
{
if (function->isFallback())
{
if (fallbackFunction)
{
m_errorReporter.declarationError(function->location(), "Only one fallback function is allowed.");
}
else
{
fallbackFunction = function;
if (_contract.isLibrary())
m_errorReporter.typeError(fallbackFunction->location(), "Libraries cannot have fallback functions.");
if (function->stateMutability() != StateMutability::NonPayable && function->stateMutability() != StateMutability::Payable)
m_errorReporter.typeError(
function->location(),
"Fallback function must be payable or non-payable, but is \"" +
stateMutabilityToString(function->stateMutability()) +
"\"."
);
if (!fallbackFunction->parameters().empty())
m_errorReporter.typeError(fallbackFunction->parameterList().location(), "Fallback function cannot take parameters.");
if (!fallbackFunction->returnParameters().empty())
m_errorReporter.typeError(fallbackFunction->returnParameterList()->location(), "Fallback function cannot return values.");
if (
_contract.sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::V050) &&
fallbackFunction->visibility() != FunctionDefinition::Visibility::External
)
m_errorReporter.typeError(fallbackFunction->location(), "Fallback function must be defined as \"external\".");
}
}
}
for (auto const& n: _contract.subNodes())
if (!visited.count(n.get()))
n->accept(*this);
checkContractExternalTypeClashes(_contract);
// check for hash collisions in function signatures
set<FixedHash<4>> hashes;
for (auto const& it: _contract.interfaceFunctionList())
{
FixedHash<4> const& hash = it.first;
if (hashes.count(hash))
m_errorReporter.typeError(
_contract.location(),
string("Function signature hash collision for ") + it.second->externalSignature()
);
hashes.insert(hash);
}
if (_contract.isLibrary())
checkLibraryRequirements(_contract);
return false;
}
void TypeChecker::checkContractDuplicateFunctions(ContractDefinition const& _contract)
{
/// Checks that two functions with the same name defined in this contract have different
/// argument types and that there is at most one constructor.
map<string, vector<FunctionDefinition const*>> functions;
for (FunctionDefinition const* function: _contract.definedFunctions())
functions[function->name()].push_back(function);
// Constructor
if (functions[_contract.name()].size() > 1)
{
SecondarySourceLocation ssl;
auto it = ++functions[_contract.name()].begin();
for (; it != functions[_contract.name()].end(); ++it)
ssl.append("Another declaration is here:", (*it)->location());
string msg = "More than one constructor defined.";
size_t occurrences = ssl.infos.size();
if (occurrences > 32)
{
ssl.infos.resize(32);
msg += " Truncated from " + boost::lexical_cast<string>(occurrences) + " to the first 32 occurrences.";
}
m_errorReporter.declarationError(
functions[_contract.name()].front()->location(),
ssl,
msg
);
}
findDuplicateDefinitions(functions, "Function with same name and arguments defined twice.");
}
void TypeChecker::checkContractDuplicateEvents(ContractDefinition const& _contract)
{
/// Checks that two events with the same name defined in this contract have different
/// argument types
map<string, vector<EventDefinition const*>> events;
for (EventDefinition const* event: _contract.events())
events[event->name()].push_back(event);
findDuplicateDefinitions(events, "Event with same name and arguments defined twice.");
}
template <class T>
void TypeChecker::findDuplicateDefinitions(map<string, vector<T>> const& _definitions, string _message)
{
for (auto const& it: _definitions)
{
vector<T> const& overloads = it.second;
set<size_t> reported;
for (size_t i = 0; i < overloads.size() && !reported.count(i); ++i)
{
SecondarySourceLocation ssl;
for (size_t j = i + 1; j < overloads.size(); ++j)
if (FunctionType(*overloads[i]).hasEqualArgumentTypes(FunctionType(*overloads[j])))
{
ssl.append("Other declaration is here:", overloads[j]->location());
reported.insert(j);
}
if (ssl.infos.size() > 0)
{
size_t occurrences = ssl.infos.size();
if (occurrences > 32)
{
ssl.infos.resize(32);
_message += " Truncated from " + boost::lexical_cast<string>(occurrences) + " to the first 32 occurrences.";
}
m_errorReporter.declarationError(
overloads[i]->location(),
ssl,
_message
);
}
}
}
}
void TypeChecker::checkContractAbstractFunctions(ContractDefinition const& _contract)
{
// Mapping from name to function definition (exactly one per argument type equality class) and
// flag to indicate whether it is fully implemented.
using FunTypeAndFlag = std::pair<FunctionTypePointer, bool>;
map<string, vector<FunTypeAndFlag>> functions;
// Search from base to derived
for (ContractDefinition const* contract: boost::adaptors::reverse(_contract.annotation().linearizedBaseContracts))
for (FunctionDefinition const* function: contract->definedFunctions())
{
// Take constructors out of overload hierarchy
if (function->isConstructor())
continue;
auto& overloads = functions[function->name()];
FunctionTypePointer funType = make_shared<FunctionType>(*function);
auto it = find_if(overloads.begin(), overloads.end(), [&](FunTypeAndFlag const& _funAndFlag)
{
return funType->hasEqualArgumentTypes(*_funAndFlag.first);
});
if (it == overloads.end())
overloads.push_back(make_pair(funType, function->isImplemented()));
else if (it->second)
{
if (!function->isImplemented())
m_errorReporter.typeError(function->location(), "Redeclaring an already implemented function as abstract");
}
else if (function->isImplemented())
it->second = true;
}
// Set to not fully implemented if at least one flag is false.
for (auto const& it: functions)
for (auto const& funAndFlag: it.second)
if (!funAndFlag.second)
{
FunctionDefinition const* function = dynamic_cast<FunctionDefinition const*>(&funAndFlag.first->declaration());
solAssert(function, "");
_contract.annotation().unimplementedFunctions.push_back(function);
break;
}
}
void TypeChecker::checkContractAbstractConstructors(ContractDefinition const& _contract)
{
set<ContractDefinition const*> argumentsNeeded;
// check that we get arguments for all base constructors that need it.
// If not mark the contract as abstract (not fully implemented)
vector<ContractDefinition const*> const& bases = _contract.annotation().linearizedBaseContracts;
for (ContractDefinition const* contract: bases)
if (FunctionDefinition const* constructor = contract->constructor())
if (contract != &_contract && !constructor->parameters().empty())
argumentsNeeded.insert(contract);
for (ContractDefinition const* contract: bases)
{
if (FunctionDefinition const* constructor = contract->constructor())
for (auto const& modifier: constructor->modifiers())
{
auto baseContract = dynamic_cast<ContractDefinition const*>(
&dereference(*modifier->name())
);
if (baseContract)
argumentsNeeded.erase(baseContract);
}
for (ASTPointer<InheritanceSpecifier> const& base: contract->baseContracts())
{
auto baseContract = dynamic_cast<ContractDefinition const*>(&dereference(base->name()));
solAssert(baseContract, "");
if (!base->arguments().empty())
argumentsNeeded.erase(baseContract);
}
}
if (!argumentsNeeded.empty())
for (ContractDefinition const* contract: argumentsNeeded)
_contract.annotation().unimplementedFunctions.push_back(contract->constructor());
}
void TypeChecker::checkContractIllegalOverrides(ContractDefinition const& _contract)
{
// TODO unify this at a later point. for this we need to put the constness and the access specifier
// into the types
map<string, vector<FunctionDefinition const*>> functions;
map<string, ModifierDefinition const*> modifiers;
// We search from derived to base, so the stored item causes the error.
for (ContractDefinition const* contract: _contract.annotation().linearizedBaseContracts)
{
for (FunctionDefinition const* function: contract->definedFunctions())
{
if (function->isConstructor())
continue; // constructors can neither be overridden nor override anything
string const& name = function->name();
if (modifiers.count(name))
m_errorReporter.typeError(modifiers[name]->location(), "Override changes function to modifier.");
for (FunctionDefinition const* overriding: functions[name])
checkFunctionOverride(*overriding, *function);
functions[name].push_back(function);
}
for (ModifierDefinition const* modifier: contract->functionModifiers())
{
string const& name = modifier->name();
ModifierDefinition const*& override = modifiers[name];
if (!override)
override = modifier;
else if (ModifierType(*override) != ModifierType(*modifier))
m_errorReporter.typeError(override->location(), "Override changes modifier signature.");
if (!functions[name].empty())
m_errorReporter.typeError(override->location(), "Override changes modifier to function.");
}
}
}
void TypeChecker::checkFunctionOverride(FunctionDefinition const& function, FunctionDefinition const& super)
{
FunctionType functionType(function);
FunctionType superType(super);
if (!functionType.hasEqualArgumentTypes(superType))
return;
if (!function.annotation().superFunction)
function.annotation().superFunction = &super;
if (function.visibility() != super.visibility())
overrideError(function, super, "Overriding function visibility differs.");
else if (function.stateMutability() != super.stateMutability())
overrideError(
function,
super,
"Overriding function changes state mutability from \"" +
stateMutabilityToString(super.stateMutability()) +
"\" to \"" +
stateMutabilityToString(function.stateMutability()) +
"\"."
);
else if (functionType != superType)
overrideError(function, super, "Overriding function return types differ.");
}
void TypeChecker::overrideError(FunctionDefinition const& function, FunctionDefinition const& super, string message)
{
m_errorReporter.typeError(
function.location(),
SecondarySourceLocation().append("Overriden function is here:", super.location()),
message
);
}
void TypeChecker::checkContractExternalTypeClashes(ContractDefinition const& _contract)
{
map<string, vector<pair<Declaration const*, FunctionTypePointer>>> externalDeclarations;
for (ContractDefinition const* contract: _contract.annotation().linearizedBaseContracts)
{
for (FunctionDefinition const* f: contract->definedFunctions())
if (f->isPartOfExternalInterface())
{
auto functionType = make_shared<FunctionType>(*f);
// under non error circumstances this should be true
if (functionType->interfaceFunctionType())
externalDeclarations[functionType->externalSignature()].push_back(
make_pair(f, functionType)
);
}
for (VariableDeclaration const* v: contract->stateVariables())
if (v->isPartOfExternalInterface())
{
auto functionType = make_shared<FunctionType>(*v);
// under non error circumstances this should be true
if (functionType->interfaceFunctionType())
externalDeclarations[functionType->externalSignature()].push_back(
make_pair(v, functionType)
);
}
}
for (auto const& it: externalDeclarations)
for (size_t i = 0; i < it.second.size(); ++i)
for (size_t j = i + 1; j < it.second.size(); ++j)
if (!it.second[i].second->hasEqualArgumentTypes(*it.second[j].second))
m_errorReporter.typeError(
it.second[j].first->location(),
"Function overload clash during conversion to external types for arguments."
);
}
void TypeChecker::checkLibraryRequirements(ContractDefinition const& _contract)
{
solAssert(_contract.isLibrary(), "");
if (!_contract.baseContracts().empty())
m_errorReporter.typeError(_contract.location(), "Library is not allowed to inherit.");
for (auto const& var: _contract.stateVariables())
if (!var->isConstant())
m_errorReporter.typeError(var->location(), "Library cannot have non-constant state variables");
}
void TypeChecker::checkDoubleStorageAssignment(Assignment const& _assignment)
{
TupleType const& lhs = dynamic_cast<TupleType const&>(*type(_assignment.leftHandSide()));
TupleType const& rhs = dynamic_cast<TupleType const&>(*type(_assignment.rightHandSide()));
bool fillRight = !lhs.components().empty() && (!lhs.components().back() || lhs.components().front());
size_t storageToStorageCopies = 0;
size_t toStorageCopies = 0;
for (size_t i = 0; i < lhs.components().size(); ++i)
{
ReferenceType const* ref = dynamic_cast<ReferenceType const*>(lhs.components()[i].get());
if (!ref || !ref->dataStoredIn(DataLocation::Storage) || ref->isPointer())
continue;
size_t rhsPos = fillRight ? i : rhs.components().size() - (lhs.components().size() - i);
solAssert(rhsPos < rhs.components().size(), "");
toStorageCopies++;
if (rhs.components()[rhsPos]->dataStoredIn(DataLocation::Storage))
storageToStorageCopies++;
}
if (storageToStorageCopies >= 1 && toStorageCopies >= 2)
m_errorReporter.warning(
_assignment.location(),
"This assignment performs two copies to storage. Since storage copies do not first "
"copy to a temporary location, one of them might be overwritten before the second "
"is executed and thus may have unexpected effects. It is safer to perform the copies "
"separately or assign to storage pointers first."
);
}
void TypeChecker::endVisit(InheritanceSpecifier const& _inheritance)
{
auto base = dynamic_cast<ContractDefinition const*>(&dereference(_inheritance.name()));
solAssert(base, "Base contract not available.");
if (m_scope->contractKind() == ContractDefinition::ContractKind::Interface)
m_errorReporter.typeError(_inheritance.location(), "Interfaces cannot inherit.");
if (base->isLibrary())
m_errorReporter.typeError(_inheritance.location(), "Libraries cannot be inherited from.");
auto const& arguments = _inheritance.arguments();
TypePointers parameterTypes;
if (base->contractKind() != ContractDefinition::ContractKind::Interface)
// Interfaces do not have constructors, so there are zero parameters.
parameterTypes = ContractType(*base).newExpressionType()->parameterTypes();
if (!arguments.empty() && parameterTypes.size() != arguments.size())
{
m_errorReporter.typeError(
_inheritance.location(),
"Wrong argument count for constructor call: " +
toString(arguments.size()) +
" arguments given but expected " +
toString(parameterTypes.size()) +
"."
);
return;
}
for (size_t i = 0; i < arguments.size(); ++i)
if (!type(*arguments[i])->isImplicitlyConvertibleTo(*parameterTypes[i]))
m_errorReporter.typeError(
arguments[i]->location(),
"Invalid type for argument in constructor call. "
"Invalid implicit conversion from " +
type(*arguments[i])->toString() +
" to " +
parameterTypes[i]->toString() +
" requested."
);
}
void TypeChecker::endVisit(UsingForDirective const& _usingFor)
{
ContractDefinition const* library = dynamic_cast<ContractDefinition const*>(
_usingFor.libraryName().annotation().referencedDeclaration
);
if (!library || !library->isLibrary())
m_errorReporter.fatalTypeError(_usingFor.libraryName().location(), "Library name expected.");
}
bool TypeChecker::visit(StructDefinition const& _struct)
{
if (m_scope->contractKind() == ContractDefinition::ContractKind::Interface)
m_errorReporter.typeError(_struct.location(), "Structs cannot be defined in interfaces.");
for (ASTPointer<VariableDeclaration> const& member: _struct.members())
if (!type(*member)->canBeStored())
m_errorReporter.typeError(member->location(), "Type cannot be used in struct.");
// Check recursion, fatal error if detected.
using StructPointer = StructDefinition const*;
using StructPointersSet = set<StructPointer>;
function<void(StructPointer,StructPointersSet const&)> check = [&](StructPointer _struct, StructPointersSet const& _parents)
{
if (_parents.count(_struct))
m_errorReporter.fatalTypeError(_struct->location(), "Recursive struct definition.");
StructPointersSet parents = _parents;
parents.insert(_struct);
for (ASTPointer<VariableDeclaration> const& member: _struct->members())
if (type(*member)->category() == Type::Category::Struct)
{
auto const& typeName = dynamic_cast<UserDefinedTypeName const&>(*member->typeName());
check(&dynamic_cast<StructDefinition const&>(*typeName.annotation().referencedDeclaration), parents);
}
};
check(&_struct, StructPointersSet{});
ASTNode::listAccept(_struct.members(), *this);
return false;
}
bool TypeChecker::visit(FunctionDefinition const& _function)
{
bool isLibraryFunction =
dynamic_cast<ContractDefinition const*>(_function.scope()) &&
dynamic_cast<ContractDefinition const*>(_function.scope())->isLibrary();
if (_function.isPayable())
{
if (isLibraryFunction)
m_errorReporter.typeError(_function.location(), "Library functions cannot be payable.");
if (!_function.isConstructor() && !_function.isFallback() && !_function.isPartOfExternalInterface())
m_errorReporter.typeError(_function.location(), "Internal functions cannot be payable.");
}
for (ASTPointer<VariableDeclaration> const& var: _function.parameters() + _function.returnParameters())
{
if (!type(*var)->canLiveOutsideStorage())
m_errorReporter.typeError(var->location(), "Type is required to live outside storage.");
if (_function.visibility() >= FunctionDefinition::Visibility::Public && !(type(*var)->interfaceType(isLibraryFunction)))
m_errorReporter.fatalTypeError(var->location(), "Internal or recursive type is not allowed for public or external functions.");
var->accept(*this);
}
set<Declaration const*> modifiers;
for (ASTPointer<ModifierInvocation> const& modifier: _function.modifiers())
{
visitManually(
*modifier,
_function.isConstructor() ?
dynamic_cast<ContractDefinition const&>(*_function.scope()).annotation().linearizedBaseContracts :
vector<ContractDefinition const*>()
);
Declaration const* decl = &dereference(*modifier->name());
if (modifiers.count(decl))
{
if (dynamic_cast<ContractDefinition const*>(decl))
m_errorReporter.declarationError(modifier->location(), "Base constructor already provided.");
}
else
modifiers.insert(decl);
}
if (m_scope->contractKind() == ContractDefinition::ContractKind::Interface)
{
if (_function.isImplemented())
m_errorReporter.typeError(_function.location(), "Functions in interfaces cannot have an implementation.");
if (_function.sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::V050))
{
if (_function.visibility() != FunctionDefinition::Visibility::External)
m_errorReporter.typeError(_function.location(), "Functions in interfaces must be declared external.");
}
else
{
if (_function.visibility() < FunctionDefinition::Visibility::Public)
m_errorReporter.typeError(_function.location(), "Functions in interfaces cannot be internal or private.");
}
if (_function.isConstructor())
m_errorReporter.typeError(_function.location(), "Constructor cannot be defined in interfaces.");
}
else if (m_scope->contractKind() == ContractDefinition::ContractKind::Library)
if (_function.isConstructor())
m_errorReporter.typeError(_function.location(), "Constructor cannot be defined in libraries.");
if (_function.isImplemented())
_function.body().accept(*this);
else if (_function.isConstructor())
m_errorReporter.typeError(_function.location(), "Constructor must be implemented if declared.");
else if (isLibraryFunction && _function.visibility() <= FunctionDefinition::Visibility::Internal)
m_errorReporter.typeError(_function.location(), "Internal library function must be implemented if declared.");
return false;
}
bool TypeChecker::visit(VariableDeclaration const& _variable)
{
// Forbid any variable declarations inside interfaces unless they are part of
// a function's input/output parameters.
if (
m_scope->contractKind() == ContractDefinition::ContractKind::Interface
&& !_variable.isCallableParameter()
)
m_errorReporter.typeError(_variable.location(), "Variables cannot be declared in interfaces.");
// Variables can be declared without type (with "var"), in which case the first assignment
// sets the type.
// Note that assignments before the first declaration are legal because of the special scoping
// rules inherited from JavaScript.
// type is filled either by ReferencesResolver directly from the type name or by
// TypeChecker at the VariableDeclarationStatement level.
TypePointer varType = _variable.annotation().type;
solAssert(!!varType, "Failed to infer variable type.");
if (_variable.value())
expectType(*_variable.value(), *varType);
if (_variable.isConstant())
{
if (!_variable.isStateVariable())
m_errorReporter.typeError(_variable.location(), "Illegal use of \"constant\" specifier.");
if (!_variable.type()->isValueType())
{
bool allowed = false;
if (auto arrayType = dynamic_cast<ArrayType const*>(_variable.type().get()))
allowed = arrayType->isByteArray();
if (!allowed)
m_errorReporter.typeError(_variable.location(), "Constants of non-value type not yet implemented.");
}
if (!_variable.value())
m_errorReporter.typeError(_variable.location(), "Uninitialized \"constant\" variable.");
else if (!_variable.value()->annotation().isPure)
{
if (_variable.sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::V050))
m_errorReporter.typeError(
_variable.value()->location(),
"Initial value for constant variable has to be compile-time constant."
);
else
m_errorReporter.warning(
_variable.value()->location(),
"Initial value for constant variable has to be compile-time constant. "
"This will fail to compile with the next breaking version change."
);
}
}
if (!_variable.isStateVariable())
{
if (varType->dataStoredIn(DataLocation::Memory) || varType->dataStoredIn(DataLocation::CallData))
if (!varType->canLiveOutsideStorage())
m_errorReporter.typeError(_variable.location(), "Type " + varType->toString() + " is only valid in storage.");
}
else if (
_variable.visibility() >= VariableDeclaration::Visibility::Public &&
!FunctionType(_variable).interfaceFunctionType()
)
m_errorReporter.typeError(_variable.location(), "Internal or recursive type is not allowed for public state variables.");
if (varType->category() == Type::Category::Array)
if (auto arrayType = dynamic_cast<ArrayType const*>(varType.get()))
if (
((arrayType->location() == DataLocation::Memory) ||
(arrayType->location() == DataLocation::CallData)) &&
!arrayType->validForCalldata()
)
m_errorReporter.typeError(_variable.location(), "Array is too large to be encoded.");
return false;
}
bool TypeChecker::visit(EnumDefinition const& _enum)
{
if (m_scope->contractKind() == ContractDefinition::ContractKind::Interface)
m_errorReporter.typeError(_enum.location(), "Enumerable cannot be declared in interfaces.");
return false;
}
void TypeChecker::visitManually(
ModifierInvocation const& _modifier,
vector<ContractDefinition const*> const& _bases
)
{
std::vector<ASTPointer<Expression>> const& arguments = _modifier.arguments();
for (ASTPointer<Expression> const& argument: arguments)
argument->accept(*this);
_modifier.name()->accept(*this);
auto const* declaration = &dereference(*_modifier.name());
vector<ASTPointer<VariableDeclaration>> emptyParameterList;
vector<ASTPointer<VariableDeclaration>> const* parameters = nullptr;
if (auto modifierDecl = dynamic_cast<ModifierDefinition const*>(declaration))
parameters = &modifierDecl->parameters();
else
// check parameters for Base constructors
for (ContractDefinition const* base: _bases)
if (declaration == base)
{
if (auto referencedConstructor = base->constructor())
parameters = &referencedConstructor->parameters();
else
parameters = &emptyParameterList;
break;
}
if (!parameters)
{
m_errorReporter.typeError(_modifier.location(), "Referenced declaration is neither modifier nor base class.");
return;
}
if (parameters->size() != arguments.size())
{
m_errorReporter.typeError(
_modifier.location(),
"Wrong argument count for modifier invocation: " +
toString(arguments.size()) +
" arguments given but expected " +
toString(parameters->size()) +
"."
);
return;
}
for (size_t i = 0; i < _modifier.arguments().size(); ++i)
if (!type(*arguments[i])->isImplicitlyConvertibleTo(*type(*(*parameters)[i])))
m_errorReporter.typeError(
arguments[i]->location(),
"Invalid type for argument in modifier invocation. "
"Invalid implicit conversion from " +
type(*arguments[i])->toString() +
" to " +
type(*(*parameters)[i])->toString() +
" requested."
);
}
bool TypeChecker::visit(EventDefinition const& _eventDef)
{
unsigned numIndexed = 0;
for (ASTPointer<VariableDeclaration> const& var: _eventDef.parameters())
{
if (var->isIndexed())
numIndexed++;
if (!type(*var)->canLiveOutsideStorage())
m_errorReporter.typeError(var->location(), "Type is required to live outside storage.");
if (!type(*var)->interfaceType(false))
m_errorReporter.typeError(var->location(), "Internal or recursive type is not allowed as event parameter type.");
}
if (_eventDef.isAnonymous() && numIndexed > 4)
m_errorReporter.typeError(_eventDef.location(), "More than 4 indexed arguments for anonymous event.");
else if (!_eventDef.isAnonymous() && numIndexed > 3)
m_errorReporter.typeError(_eventDef.location(), "More than 3 indexed arguments for event.");
return false;
}
void TypeChecker::endVisit(FunctionTypeName const& _funType)
{
FunctionType const& fun = dynamic_cast<FunctionType const&>(*_funType.annotation().type);
if (fun.kind() == FunctionType::Kind::External)
if (!fun.canBeUsedExternally(false))
m_errorReporter.typeError(_funType.location(), "External function type uses internal types.");
}
bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
{
// External references have already been resolved in a prior stage and stored in the annotation.
// We run the resolve step again regardless.
julia::ExternalIdentifierAccess::Resolver identifierAccess = [&](
assembly::Identifier const& _identifier,
julia::IdentifierContext _context,
bool
)
{
auto ref = _inlineAssembly.annotation().externalReferences.find(&_identifier);
if (ref == _inlineAssembly.annotation().externalReferences.end())
return size_t(-1);
Declaration const* declaration = ref->second.declaration;
solAssert(!!declaration, "");
if (auto var = dynamic_cast<VariableDeclaration const*>(declaration))
{
if (ref->second.isSlot || ref->second.isOffset)
{
if (!var->isStateVariable() && !var->type()->dataStoredIn(DataLocation::Storage))
{
m_errorReporter.typeError(_identifier.location, "The suffixes _offset and _slot can only be used on storage variables.");
return size_t(-1);
}
else if (_context != julia::IdentifierContext::RValue)
{
m_errorReporter.typeError(_identifier.location, "Storage variables cannot be assigned to.");
return size_t(-1);
}
}
else if (var->isConstant())
{
m_errorReporter.typeError(_identifier.location, "Constant variables not supported by inline assembly.");
return size_t(-1);
}
else if (!var->isLocalVariable())
{
m_errorReporter.typeError(_identifier.location, "Only local variables are supported. To access storage variables, use the _slot and _offset suffixes.");
return size_t(-1);
}
else if (var->type()->dataStoredIn(DataLocation::Storage))
{
m_errorReporter.typeError(_identifier.location, "You have to use the _slot or _offset prefix to access storage reference variables.");
return size_t(-1);
}
else if (var->type()->sizeOnStack() != 1)
{
if (var->type()->dataStoredIn(DataLocation::CallData))
m_errorReporter.typeError(_identifier.location, "Call data elements cannot be accessed directly. Copy to a local variable first or use \"calldataload\" or \"calldatacopy\" with manually determined offsets and sizes.");
else
m_errorReporter.typeError(_identifier.location, "Only types that use one stack slot are supported.");
return size_t(-1);
}
}
else if (_context == julia::IdentifierContext::LValue)
{
m_errorReporter.typeError(_identifier.location, "Only local variables can be assigned to in inline assembly.");
return size_t(-1);
}
if (_context == julia::IdentifierContext::RValue)
{
solAssert(!!declaration->type(), "Type of declaration required but not yet determined.");
if (dynamic_cast<FunctionDefinition const*>(declaration))
{
}
else if (dynamic_cast<VariableDeclaration const*>(declaration))
{
}
else if (auto contract = dynamic_cast<ContractDefinition const*>(declaration))
{
if (!contract->isLibrary())
{
m_errorReporter.typeError(_identifier.location, "Expected a library.");
return size_t(-1);
}
}
else
return size_t(-1);
}
ref->second.valueSize = 1;
return size_t(1);
};
solAssert(!_inlineAssembly.annotation().analysisInfo, "");
_inlineAssembly.annotation().analysisInfo = make_shared<assembly::AsmAnalysisInfo>();
assembly::AsmAnalyzer analyzer(
*_inlineAssembly.annotation().analysisInfo,
m_errorReporter,
false,
identifierAccess
);
if (!analyzer.analyze(_inlineAssembly.operations()))
return false;
return true;
}
bool TypeChecker::visit(IfStatement const& _ifStatement)
{
expectType(_ifStatement.condition(), BoolType());
_ifStatement.trueStatement().accept(*this);
if (_ifStatement.falseStatement())
_ifStatement.falseStatement()->accept(*this);
return false;
}
bool TypeChecker::visit(WhileStatement const& _whileStatement)
{
expectType(_whileStatement.condition(), BoolType());
_whileStatement.body().accept(*this);
return false;
}
bool TypeChecker::visit(ForStatement const& _forStatement)
{
if (_forStatement.initializationExpression())
_forStatement.initializationExpression()->accept(*this);
if (_forStatement.condition())
expectType(*_forStatement.condition(), BoolType());
if (_forStatement.loopExpression())
_forStatement.loopExpression()->accept(*this);
_forStatement.body().accept(*this);
return false;
}
void TypeChecker::endVisit(Return const& _return)
{
if (!_return.expression())
return;
ParameterList const* params = _return.annotation().functionReturnParameters;
if (!params)
{
m_errorReporter.typeError(_return.location(), "Return arguments not allowed.");
return;
}
TypePointers returnTypes;
for (auto const& var: params->parameters())
returnTypes.push_back(type(*var));
if (auto tupleType = dynamic_cast<TupleType const*>(type(*_return.expression()).get()))
{
if (tupleType->components().size() != params->parameters().size())
m_errorReporter.typeError(_return.location(), "Different number of arguments in return statement than in returns declaration.");
else if (!tupleType->isImplicitlyConvertibleTo(TupleType(returnTypes)))
m_errorReporter.typeError(
_return.expression()->location(),
"Return argument type " +
type(*_return.expression())->toString() +
" is not implicitly convertible to expected type " +
TupleType(returnTypes).toString(false) +
"."
);
}
else if (params->parameters().size() != 1)
m_errorReporter.typeError(_return.location(), "Different number of arguments in return statement than in returns declaration.");
else
{
TypePointer const& expected = type(*params->parameters().front());
if (!type(*_return.expression())->isImplicitlyConvertibleTo(*expected))
m_errorReporter.typeError(
_return.expression()->location(),
"Return argument type " +
type(*_return.expression())->toString() +
" is not implicitly convertible to expected type (type of first return variable) " +
expected->toString() +
"."
);
}
}
bool TypeChecker::visit(VariableDeclarationStatement const& _statement)
{
if (!_statement.initialValue())
{
// No initial value is only permitted for single variables with specified type.
if (_statement.declarations().size() != 1 || !_statement.declarations().front())
m_errorReporter.fatalTypeError(_statement.location(), "Assignment necessary for type detection.");
VariableDeclaration const& varDecl = *_statement.declarations().front();
if (!varDecl.annotation().type)
m_errorReporter.fatalTypeError(_statement.location(), "Assignment necessary for type detection.");
if (auto ref = dynamic_cast<ReferenceType const*>(type(varDecl).get()))
{
if (ref->dataStoredIn(DataLocation::Storage))
{
string errorText{"Uninitialized storage pointer."};
if (varDecl.referenceLocation() == VariableDeclaration::Location::Default)
errorText += " Did you mean '<type> memory " + varDecl.name() + "'?";
m_errorReporter.warning(varDecl.location(), errorText);
}
}
else if (dynamic_cast<MappingType const*>(type(varDecl).get()))
m_errorReporter.typeError(
varDecl.location(),
"Uninitialized mapping. Mappings cannot be created dynamically, you have to assign them from a state variable."
);
varDecl.accept(*this);
return false;
}
// Here we have an initial value and might have to derive some types before we can visit
// the variable declaration(s).
_statement.initialValue()->accept(*this);
TypePointers valueTypes;
if (auto tupleType = dynamic_cast<TupleType const*>(type(*_statement.initialValue()).get()))
valueTypes = tupleType->components();
else
valueTypes = TypePointers{type(*_statement.initialValue())};
// Determine which component is assigned to which variable.
// If numbers do not match, fill up if variables begin or end empty (not both).
vector<VariableDeclaration const*>& assignments = _statement.annotation().assignments;
assignments.resize(valueTypes.size(), nullptr);
vector<ASTPointer<VariableDeclaration>> const& variables = _statement.declarations();
if (variables.empty())