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616 lines
22 KiB
616 lines
22 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* Solidity abstract syntax tree.
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*/
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#include <algorithm>
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#include <libsolidity/Utils.h>
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#include <libsolidity/AST.h>
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#include <libsolidity/ASTVisitor.h>
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#include <libsolidity/Exceptions.h>
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#include <libsolidity/AST_accept.h>
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#include <libdevcrypto/SHA3.h>
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using namespace std;
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namespace dev
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{
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namespace solidity
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{
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TypeError ASTNode::createTypeError(string const& _description) const
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{
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return TypeError() << errinfo_sourceLocation(getLocation()) << errinfo_comment(_description);
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}
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TypePointer ContractDefinition::getType(ContractDefinition const* _currentContract) const
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{
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return make_shared<TypeType>(make_shared<ContractType>(*this), _currentContract);
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}
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void ContractDefinition::checkTypeRequirements()
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{
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for (ASTPointer<InheritanceSpecifier> const& baseSpecifier: getBaseContracts())
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baseSpecifier->checkTypeRequirements();
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checkIllegalOverrides();
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FunctionDefinition const* constructor = getConstructor();
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if (constructor && !constructor->getReturnParameters().empty())
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BOOST_THROW_EXCEPTION(constructor->getReturnParameterList()->createTypeError(
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"Non-empty \"returns\" directive for constructor."));
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FunctionDefinition const* fallbackFunction = nullptr;
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for (ASTPointer<FunctionDefinition> const& function: getDefinedFunctions())
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if (function->getName().empty())
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{
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if (fallbackFunction)
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BOOST_THROW_EXCEPTION(DeclarationError() << errinfo_comment("Only one fallback function is allowed."));
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else
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{
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fallbackFunction = function.get();
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if (!fallbackFunction->getParameters().empty())
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BOOST_THROW_EXCEPTION(fallbackFunction->getParameterList().createTypeError("Fallback function cannot take parameters."));
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}
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}
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for (ASTPointer<ModifierDefinition> const& modifier: getFunctionModifiers())
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modifier->checkTypeRequirements();
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for (ASTPointer<FunctionDefinition> const& function: getDefinedFunctions())
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function->checkTypeRequirements();
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// check for hash collisions in function signatures
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set<FixedHash<4>> hashes;
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for (auto const& it: getInterfaceFunctionList())
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{
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FixedHash<4> const& hash = it.first;
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if (hashes.count(hash))
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BOOST_THROW_EXCEPTION(createTypeError(
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std::string("Function signature hash collision for ") +
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it.second->getCanonicalSignature()));
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hashes.insert(hash);
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}
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}
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map<FixedHash<4>, FunctionTypePointer> ContractDefinition::getInterfaceFunctions() const
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{
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auto exportedFunctionList = getInterfaceFunctionList();
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map<FixedHash<4>, FunctionTypePointer> exportedFunctions;
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for (auto const& it: exportedFunctionList)
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exportedFunctions.insert(it);
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solAssert(exportedFunctionList.size() == exportedFunctions.size(),
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"Hash collision at Function Definition Hash calculation");
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return exportedFunctions;
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}
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FunctionDefinition const* ContractDefinition::getConstructor() const
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{
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for (ASTPointer<FunctionDefinition> const& f: m_definedFunctions)
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if (f->isConstructor())
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return f.get();
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return nullptr;
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}
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FunctionDefinition const* ContractDefinition::getFallbackFunction() const
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{
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for (ContractDefinition const* contract: getLinearizedBaseContracts())
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for (ASTPointer<FunctionDefinition> const& f: contract->getDefinedFunctions())
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if (f->getName().empty())
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return f.get();
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return nullptr;
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}
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void ContractDefinition::checkIllegalOverrides() const
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{
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// TODO unify this at a later point. for this we need to put the constness and the access specifier
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// into the types
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map<string, FunctionDefinition const*> functions;
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map<string, ModifierDefinition const*> modifiers;
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// We search from derived to base, so the stored item causes the error.
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for (ContractDefinition const* contract: getLinearizedBaseContracts())
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{
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for (ASTPointer<FunctionDefinition> const& function: contract->getDefinedFunctions())
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{
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if (function->isConstructor())
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continue; // constructors can neither be overridden nor override anything
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string const& name = function->getName();
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if (modifiers.count(name))
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BOOST_THROW_EXCEPTION(modifiers[name]->createTypeError("Override changes function to modifier."));
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FunctionDefinition const*& override = functions[name];
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if (!override)
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override = function.get();
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else if (override->getVisibility() != function->getVisibility() ||
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override->isDeclaredConst() != function->isDeclaredConst() ||
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FunctionType(*override) != FunctionType(*function))
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BOOST_THROW_EXCEPTION(override->createTypeError("Override changes extended function signature."));
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}
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for (ASTPointer<ModifierDefinition> const& modifier: contract->getFunctionModifiers())
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{
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string const& name = modifier->getName();
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if (functions.count(name))
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BOOST_THROW_EXCEPTION(functions[name]->createTypeError("Override changes modifier to function."));
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ModifierDefinition const*& override = modifiers[name];
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if (!override)
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override = modifier.get();
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else if (ModifierType(*override) != ModifierType(*modifier))
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BOOST_THROW_EXCEPTION(override->createTypeError("Override changes modifier signature."));
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}
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}
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}
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std::vector<ASTPointer<EventDefinition>> const& ContractDefinition::getInterfaceEvents() const
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{
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if (!m_interfaceEvents)
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{
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set<string> eventsSeen;
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m_interfaceEvents.reset(new std::vector<ASTPointer<EventDefinition>>());
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for (ContractDefinition const* contract: getLinearizedBaseContracts())
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for (ASTPointer<EventDefinition> const& e: contract->getEvents())
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if (eventsSeen.count(e->getName()) == 0)
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{
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eventsSeen.insert(e->getName());
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m_interfaceEvents->push_back(e);
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}
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}
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return *m_interfaceEvents;
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}
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vector<pair<FixedHash<4>, FunctionTypePointer>> const& ContractDefinition::getInterfaceFunctionList() const
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{
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if (!m_interfaceFunctionList)
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{
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set<string> functionsSeen;
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m_interfaceFunctionList.reset(new vector<pair<FixedHash<4>, FunctionTypePointer>>());
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for (ContractDefinition const* contract: getLinearizedBaseContracts())
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{
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for (ASTPointer<FunctionDefinition> const& f: contract->getDefinedFunctions())
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if (f->isPublic() && !f->isConstructor() && !f->getName().empty() && functionsSeen.count(f->getName()) == 0)
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{
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functionsSeen.insert(f->getName());
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FixedHash<4> hash(dev::sha3(f->getCanonicalSignature()));
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m_interfaceFunctionList->push_back(make_pair(hash, make_shared<FunctionType>(*f, false)));
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}
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for (ASTPointer<VariableDeclaration> const& v: contract->getStateVariables())
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if (v->isPublic() && functionsSeen.count(v->getName()) == 0)
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{
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FunctionType ftype(*v);
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functionsSeen.insert(v->getName());
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FixedHash<4> hash(dev::sha3(ftype.getCanonicalSignature(v->getName())));
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m_interfaceFunctionList->push_back(make_pair(hash, make_shared<FunctionType>(*v)));
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}
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}
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}
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return *m_interfaceFunctionList;
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}
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void InheritanceSpecifier::checkTypeRequirements()
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{
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m_baseName->checkTypeRequirements();
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for (ASTPointer<Expression> const& argument: m_arguments)
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argument->checkTypeRequirements();
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ContractDefinition const* base = dynamic_cast<ContractDefinition const*>(m_baseName->getReferencedDeclaration());
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solAssert(base, "Base contract not available.");
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TypePointers parameterTypes = ContractType(*base).getConstructorType()->getParameterTypes();
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if (parameterTypes.size() != m_arguments.size())
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BOOST_THROW_EXCEPTION(createTypeError("Wrong argument count for constructor call."));
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for (size_t i = 0; i < m_arguments.size(); ++i)
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if (!m_arguments[i]->getType()->isImplicitlyConvertibleTo(*parameterTypes[i]))
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BOOST_THROW_EXCEPTION(createTypeError("Invalid type for argument in constructer call."));
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}
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TypePointer StructDefinition::getType(ContractDefinition const*) const
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{
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return make_shared<TypeType>(make_shared<StructType>(*this));
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}
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void StructDefinition::checkMemberTypes() const
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{
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for (ASTPointer<VariableDeclaration> const& member: getMembers())
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if (!member->getType()->canBeStored())
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BOOST_THROW_EXCEPTION(member->createTypeError("Type cannot be used in struct."));
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}
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void StructDefinition::checkRecursion() const
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{
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set<StructDefinition const*> definitionsSeen;
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vector<StructDefinition const*> queue = {this};
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while (!queue.empty())
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{
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StructDefinition const* def = queue.back();
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queue.pop_back();
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if (definitionsSeen.count(def))
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BOOST_THROW_EXCEPTION(ParserError() << errinfo_sourceLocation(def->getLocation())
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<< errinfo_comment("Recursive struct definition."));
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definitionsSeen.insert(def);
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for (ASTPointer<VariableDeclaration> const& member: def->getMembers())
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if (member->getType()->getCategory() == Type::Category::Struct)
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{
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UserDefinedTypeName const& typeName = dynamic_cast<UserDefinedTypeName const&>(*member->getTypeName());
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queue.push_back(&dynamic_cast<StructDefinition const&>(*typeName.getReferencedDeclaration()));
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}
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}
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}
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TypePointer FunctionDefinition::getType(ContractDefinition const*) const
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{
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return make_shared<FunctionType>(*this);
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}
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void FunctionDefinition::checkTypeRequirements()
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{
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for (ASTPointer<VariableDeclaration> const& var: getParameters() + getReturnParameters())
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if (!var->getType()->canLiveOutsideStorage())
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BOOST_THROW_EXCEPTION(var->createTypeError("Type is required to live outside storage."));
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for (ASTPointer<ModifierInvocation> const& modifier: m_functionModifiers)
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modifier->checkTypeRequirements();
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m_body->checkTypeRequirements();
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}
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string FunctionDefinition::getCanonicalSignature() const
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{
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return FunctionType(*this).getCanonicalSignature(getName());
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}
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Declaration::LValueType VariableDeclaration::getLValueType() const
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{
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if (dynamic_cast<FunctionDefinition const*>(getScope()) || dynamic_cast<ModifierDefinition const*>(getScope()))
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return Declaration::LValueType::Local;
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else
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return Declaration::LValueType::Storage;
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}
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TypePointer ModifierDefinition::getType(ContractDefinition const*) const
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{
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return make_shared<ModifierType>(*this);
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}
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void ModifierDefinition::checkTypeRequirements()
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{
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m_body->checkTypeRequirements();
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}
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void ModifierInvocation::checkTypeRequirements()
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{
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m_modifierName->checkTypeRequirements();
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for (ASTPointer<Expression> const& argument: m_arguments)
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argument->checkTypeRequirements();
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ModifierDefinition const* modifier = dynamic_cast<ModifierDefinition const*>(m_modifierName->getReferencedDeclaration());
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solAssert(modifier, "Function modifier not found.");
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vector<ASTPointer<VariableDeclaration>> const& parameters = modifier->getParameters();
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if (parameters.size() != m_arguments.size())
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BOOST_THROW_EXCEPTION(createTypeError("Wrong argument count for modifier invocation."));
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for (size_t i = 0; i < m_arguments.size(); ++i)
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if (!m_arguments[i]->getType()->isImplicitlyConvertibleTo(*parameters[i]->getType()))
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BOOST_THROW_EXCEPTION(createTypeError("Invalid type for argument in modifier invocation."));
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}
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void EventDefinition::checkTypeRequirements()
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{
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int numIndexed = 0;
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for (ASTPointer<VariableDeclaration> const& var: getParameters())
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{
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if (var->isIndexed())
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numIndexed++;
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if (!var->getType()->canLiveOutsideStorage())
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BOOST_THROW_EXCEPTION(var->createTypeError("Type is required to live outside storage."));
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}
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if (numIndexed > 3)
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BOOST_THROW_EXCEPTION(createTypeError("More than 3 indexed arguments for event."));
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}
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void Block::checkTypeRequirements()
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{
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for (shared_ptr<Statement> const& statement: m_statements)
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statement->checkTypeRequirements();
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}
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void IfStatement::checkTypeRequirements()
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{
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m_condition->expectType(BoolType());
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m_trueBody->checkTypeRequirements();
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if (m_falseBody)
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m_falseBody->checkTypeRequirements();
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}
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void WhileStatement::checkTypeRequirements()
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{
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m_condition->expectType(BoolType());
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m_body->checkTypeRequirements();
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}
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void ForStatement::checkTypeRequirements()
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{
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if (m_initExpression)
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m_initExpression->checkTypeRequirements();
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if (m_condExpression)
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m_condExpression->expectType(BoolType());
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if (m_loopExpression)
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m_loopExpression->checkTypeRequirements();
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m_body->checkTypeRequirements();
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}
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void Return::checkTypeRequirements()
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{
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if (!m_expression)
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return;
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if (!m_returnParameters)
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BOOST_THROW_EXCEPTION(createTypeError("Return arguments not allowed."));
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if (m_returnParameters->getParameters().size() != 1)
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BOOST_THROW_EXCEPTION(createTypeError("Different number of arguments in return statement "
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"than in returns declaration."));
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// this could later be changed such that the paramaters type is an anonymous struct type,
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// but for now, we only allow one return parameter
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m_expression->expectType(*m_returnParameters->getParameters().front()->getType());
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}
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void VariableDefinition::checkTypeRequirements()
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{
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// Variables can be declared without type (with "var"), in which case the first assignment
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// sets the type.
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// Note that assignments before the first declaration are legal because of the special scoping
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// rules inherited from JavaScript.
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if (m_value)
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{
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if (m_variable->getType())
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m_value->expectType(*m_variable->getType());
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else
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{
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// no type declared and no previous assignment, infer the type
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m_value->checkTypeRequirements();
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TypePointer type = m_value->getType();
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if (type->getCategory() == Type::Category::IntegerConstant)
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{
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auto intType = dynamic_pointer_cast<IntegerConstantType const>(type)->getIntegerType();
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if (!intType)
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BOOST_THROW_EXCEPTION(m_value->createTypeError("Invalid integer constant " + type->toString()));
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type = intType;
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}
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else if (type->getCategory() == Type::Category::Void)
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BOOST_THROW_EXCEPTION(m_variable->createTypeError("var cannot be void type"));
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m_variable->setType(type);
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}
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}
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}
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void Assignment::checkTypeRequirements()
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{
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m_leftHandSide->checkTypeRequirements();
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m_leftHandSide->requireLValue();
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//@todo later, assignments to structs might be possible, but not to mappings
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if (!m_leftHandSide->getType()->isValueType() && !m_leftHandSide->isLocalLValue())
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BOOST_THROW_EXCEPTION(createTypeError("Assignment to non-local non-value lvalue."));
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m_type = m_leftHandSide->getType();
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if (m_assigmentOperator == Token::Assign)
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m_rightHandSide->expectType(*m_type);
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else
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{
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// compound assignment
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m_rightHandSide->checkTypeRequirements();
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TypePointer resultType = m_type->binaryOperatorResult(Token::AssignmentToBinaryOp(m_assigmentOperator),
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m_rightHandSide->getType());
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if (!resultType || *resultType != *m_type)
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BOOST_THROW_EXCEPTION(createTypeError("Operator " + string(Token::toString(m_assigmentOperator)) +
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" not compatible with types " +
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m_type->toString() + " and " +
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m_rightHandSide->getType()->toString()));
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}
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}
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void ExpressionStatement::checkTypeRequirements()
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{
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m_expression->checkTypeRequirements();
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if (m_expression->getType()->getCategory() == Type::Category::IntegerConstant)
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if (!dynamic_pointer_cast<IntegerConstantType const>(m_expression->getType())->getIntegerType())
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BOOST_THROW_EXCEPTION(m_expression->createTypeError("Invalid integer constant."));
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}
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void Expression::expectType(Type const& _expectedType)
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{
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checkTypeRequirements();
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Type const& type = *getType();
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if (!type.isImplicitlyConvertibleTo(_expectedType))
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BOOST_THROW_EXCEPTION(createTypeError("Type " + type.toString() +
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" not implicitly convertible to expected type "
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+ _expectedType.toString() + "."));
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}
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void Expression::requireLValue()
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{
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if (!isLValue())
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BOOST_THROW_EXCEPTION(createTypeError("Expression has to be an lvalue."));
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m_lvalueRequested = true;
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}
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void UnaryOperation::checkTypeRequirements()
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{
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// Inc, Dec, Add, Sub, Not, BitNot, Delete
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m_subExpression->checkTypeRequirements();
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if (m_operator == Token::Value::Inc || m_operator == Token::Value::Dec || m_operator == Token::Value::Delete)
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m_subExpression->requireLValue();
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m_type = m_subExpression->getType()->unaryOperatorResult(m_operator);
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if (!m_type)
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BOOST_THROW_EXCEPTION(createTypeError("Unary operator not compatible with type."));
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}
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void BinaryOperation::checkTypeRequirements()
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{
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m_left->checkTypeRequirements();
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m_right->checkTypeRequirements();
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m_commonType = m_left->getType()->binaryOperatorResult(m_operator, m_right->getType());
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if (!m_commonType)
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BOOST_THROW_EXCEPTION(createTypeError("Operator " + string(Token::toString(m_operator)) +
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" not compatible with types " +
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m_left->getType()->toString() + " and " +
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m_right->getType()->toString()));
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m_type = Token::isCompareOp(m_operator) ? make_shared<BoolType>() : m_commonType;
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}
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void FunctionCall::checkTypeRequirements()
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{
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m_expression->checkTypeRequirements();
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for (ASTPointer<Expression> const& argument: m_arguments)
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argument->checkTypeRequirements();
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Type const* expressionType = m_expression->getType().get();
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if (isTypeConversion())
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{
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TypeType const& type = dynamic_cast<TypeType const&>(*expressionType);
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//@todo for structs, we have to check the number of arguments to be equal to the
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// number of non-mapping members
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if (m_arguments.size() != 1)
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BOOST_THROW_EXCEPTION(createTypeError("More than one argument for explicit type conversion."));
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if (!m_names.empty())
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BOOST_THROW_EXCEPTION(createTypeError("Type conversion cannot allow named arguments."));
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|
if (!m_arguments.front()->getType()->isExplicitlyConvertibleTo(*type.getActualType()))
|
|
BOOST_THROW_EXCEPTION(createTypeError("Explicit type conversion not allowed."));
|
|
m_type = type.getActualType();
|
|
}
|
|
else if (FunctionType const* functionType = dynamic_cast<FunctionType const*>(expressionType))
|
|
{
|
|
//@todo would be nice to create a struct type from the arguments
|
|
// and then ask if that is implicitly convertible to the struct represented by the
|
|
// function parameters
|
|
TypePointers const& parameterTypes = functionType->getParameterTypes();
|
|
if (functionType->getLocation() != FunctionType::Location::SHA3 && parameterTypes.size() != m_arguments.size())
|
|
BOOST_THROW_EXCEPTION(createTypeError("Wrong argument count for function call."));
|
|
|
|
if (m_names.empty())
|
|
{
|
|
for (size_t i = 0; i < m_arguments.size(); ++i)
|
|
if (functionType->getLocation() != FunctionType::Location::SHA3 &&
|
|
!m_arguments[i]->getType()->isImplicitlyConvertibleTo(*parameterTypes[i]))
|
|
BOOST_THROW_EXCEPTION(m_arguments[i]->createTypeError("Invalid type for argument in function call."));
|
|
}
|
|
else
|
|
{
|
|
if (functionType->getLocation() == FunctionType::Location::SHA3)
|
|
BOOST_THROW_EXCEPTION(createTypeError("Named arguments cannnot be used for SHA3."));
|
|
auto const& parameterNames = functionType->getParameterNames();
|
|
if (parameterNames.size() != m_names.size())
|
|
BOOST_THROW_EXCEPTION(createTypeError("Some argument names are missing."));
|
|
|
|
// check duplicate names
|
|
for (size_t i = 0; i < m_names.size(); i++)
|
|
for (size_t j = i + 1; j < m_names.size(); j++)
|
|
if (*m_names[i] == *m_names[j])
|
|
BOOST_THROW_EXCEPTION(m_arguments[i]->createTypeError("Duplicate named argument."));
|
|
|
|
for (size_t i = 0; i < m_names.size(); i++) {
|
|
bool found = false;
|
|
for (size_t j = 0; j < parameterNames.size(); j++) {
|
|
if (parameterNames[j] == *m_names[i]) {
|
|
// check type convertible
|
|
if (!m_arguments[i]->getType()->isImplicitlyConvertibleTo(*parameterTypes[j]))
|
|
BOOST_THROW_EXCEPTION(createTypeError("Invalid type for argument in function call."));
|
|
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
BOOST_THROW_EXCEPTION(createTypeError("Named argument does not match function declaration."));
|
|
}
|
|
}
|
|
|
|
// @todo actually the return type should be an anonymous struct,
|
|
// but we change it to the type of the first return value until we have structs
|
|
if (functionType->getReturnParameterTypes().empty())
|
|
m_type = make_shared<VoidType>();
|
|
else
|
|
m_type = functionType->getReturnParameterTypes().front();
|
|
}
|
|
else
|
|
BOOST_THROW_EXCEPTION(createTypeError("Type is not callable."));
|
|
}
|
|
|
|
bool FunctionCall::isTypeConversion() const
|
|
{
|
|
return m_expression->getType()->getCategory() == Type::Category::TypeType;
|
|
}
|
|
|
|
void NewExpression::checkTypeRequirements()
|
|
{
|
|
m_contractName->checkTypeRequirements();
|
|
m_contract = dynamic_cast<ContractDefinition const*>(m_contractName->getReferencedDeclaration());
|
|
if (!m_contract)
|
|
BOOST_THROW_EXCEPTION(createTypeError("Identifier is not a contract."));
|
|
shared_ptr<ContractType const> contractType = make_shared<ContractType>(*m_contract);
|
|
TypePointers const& parameterTypes = contractType->getConstructorType()->getParameterTypes();
|
|
m_type = make_shared<FunctionType>(parameterTypes, TypePointers{contractType},
|
|
FunctionType::Location::Creation);
|
|
}
|
|
|
|
void MemberAccess::checkTypeRequirements()
|
|
{
|
|
m_expression->checkTypeRequirements();
|
|
Type const& type = *m_expression->getType();
|
|
m_type = type.getMemberType(*m_memberName);
|
|
if (!m_type)
|
|
BOOST_THROW_EXCEPTION(createTypeError("Member \"" + *m_memberName + "\" not found or not "
|
|
"visible in " + type.toString()));
|
|
//@todo later, this will not always be STORAGE
|
|
m_lvalue = type.getCategory() == Type::Category::Struct ? Declaration::LValueType::Storage : Declaration::LValueType::None;
|
|
}
|
|
|
|
void IndexAccess::checkTypeRequirements()
|
|
{
|
|
m_base->checkTypeRequirements();
|
|
if (m_base->getType()->getCategory() != Type::Category::Mapping)
|
|
BOOST_THROW_EXCEPTION(m_base->createTypeError("Indexed expression has to be a mapping (is " +
|
|
m_base->getType()->toString() + ")"));
|
|
MappingType const& type = dynamic_cast<MappingType const&>(*m_base->getType());
|
|
m_index->expectType(*type.getKeyType());
|
|
m_type = type.getValueType();
|
|
m_lvalue = Declaration::LValueType::Storage;
|
|
}
|
|
|
|
void Identifier::checkTypeRequirements()
|
|
{
|
|
solAssert(m_referencedDeclaration, "Identifier not resolved.");
|
|
|
|
m_lvalue = m_referencedDeclaration->getLValueType();
|
|
m_type = m_referencedDeclaration->getType(m_currentContract);
|
|
if (!m_type)
|
|
BOOST_THROW_EXCEPTION(createTypeError("Declaration referenced before type could be determined."));
|
|
}
|
|
|
|
void ElementaryTypeNameExpression::checkTypeRequirements()
|
|
{
|
|
m_type = make_shared<TypeType>(Type::fromElementaryTypeName(m_typeToken));
|
|
}
|
|
|
|
void Literal::checkTypeRequirements()
|
|
{
|
|
m_type = Type::forLiteral(*this);
|
|
if (!m_type)
|
|
BOOST_THROW_EXCEPTION(createTypeError("Invalid literal value."));
|
|
}
|
|
|
|
}
|
|
}
|
|
|