2018-11-29 16:35:14 +00:00
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/*
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This file is part of solidity.
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solidity 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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solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Component that verifies overloads, abstract contracts, function clashes and others
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* checks at contract or function level.
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*/
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#include <libsolidity/analysis/ContractLevelChecker.h>
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2018-12-17 11:30:08 +00:00
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#include <libsolidity/ast/AST.h>
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2019-04-15 13:33:39 +00:00
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#include <libsolidity/ast/TypeProvider.h>
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2019-03-04 13:33:46 +00:00
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#include <libsolidity/analysis/TypeChecker.h>
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2018-11-29 16:35:14 +00:00
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#include <liblangutil/ErrorReporter.h>
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2018-11-29 16:51:57 +00:00
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#include <boost/range/adaptor/reversed.hpp>
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2019-09-16 12:33:43 +00:00
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#include <boost/algorithm/string/predicate.hpp>
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2018-11-29 16:51:57 +00:00
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2018-11-29 16:35:14 +00:00
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using namespace std;
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2019-12-11 16:31:36 +00:00
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using namespace solidity;
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using namespace solidity::langutil;
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using namespace solidity::frontend;
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2018-11-29 16:35:14 +00:00
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2019-09-16 12:33:43 +00:00
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namespace
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{
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2019-11-28 15:53:13 +00:00
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template <class T, class B>
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bool hasEqualNameAndParameters(T const& _a, B const& _b)
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2019-09-16 10:27:54 +00:00
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{
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2019-09-16 12:33:43 +00:00
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return
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_a.name() == _b.name() &&
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2019-09-16 10:27:54 +00:00
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FunctionType(_a).asCallableFunction(false)->hasEqualParameterTypes(
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*FunctionType(_b).asCallableFunction(false)
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);
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}
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}
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2018-11-29 16:35:14 +00:00
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2018-11-29 16:39:57 +00:00
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bool ContractLevelChecker::check(ContractDefinition const& _contract)
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2018-11-29 16:35:14 +00:00
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{
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2018-11-29 17:23:58 +00:00
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checkDuplicateFunctions(_contract);
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checkDuplicateEvents(_contract);
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2019-12-09 22:43:58 +00:00
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m_overrideChecker.check(_contract);
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2018-11-29 17:23:58 +00:00
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checkBaseConstructorArguments(_contract);
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2020-04-15 10:42:15 +00:00
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checkAbstractDefinitions(_contract);
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2018-11-29 17:32:06 +00:00
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checkExternalTypeClashes(_contract);
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2018-11-29 17:33:54 +00:00
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checkHashCollisions(_contract);
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2018-11-29 17:36:26 +00:00
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checkLibraryRequirements(_contract);
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2019-03-04 13:33:46 +00:00
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checkBaseABICompatibility(_contract);
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2019-09-09 16:22:02 +00:00
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checkPayableFallbackWithoutReceive(_contract);
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2018-11-29 16:39:57 +00:00
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2018-11-29 16:35:14 +00:00
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return Error::containsOnlyWarnings(m_errorReporter.errors());
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}
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2018-11-29 16:39:57 +00:00
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2018-11-29 17:23:58 +00:00
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void ContractLevelChecker::checkDuplicateFunctions(ContractDefinition const& _contract)
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2018-11-29 16:39:57 +00:00
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{
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/// Checks that two functions with the same name defined in this contract have different
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/// argument types and that there is at most one constructor.
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map<string, vector<FunctionDefinition const*>> functions;
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FunctionDefinition const* constructor = nullptr;
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FunctionDefinition const* fallback = nullptr;
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2019-09-09 16:22:02 +00:00
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FunctionDefinition const* receive = nullptr;
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2018-11-29 16:39:57 +00:00
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for (FunctionDefinition const* function: _contract.definedFunctions())
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if (function->isConstructor())
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{
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if (constructor)
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m_errorReporter.declarationError(
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function->location(),
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SecondarySourceLocation().append("Another declaration is here:", constructor->location()),
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"More than one constructor defined."
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);
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constructor = function;
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}
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else if (function->isFallback())
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{
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if (fallback)
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m_errorReporter.declarationError(
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function->location(),
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SecondarySourceLocation().append("Another declaration is here:", fallback->location()),
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"Only one fallback function is allowed."
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);
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fallback = function;
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}
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2019-09-09 16:22:02 +00:00
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else if (function->isReceive())
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{
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if (receive)
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m_errorReporter.declarationError(
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function->location(),
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SecondarySourceLocation().append("Another declaration is here:", receive->location()),
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"Only one receive function is allowed."
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);
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receive = function;
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}
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2018-11-29 16:39:57 +00:00
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else
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{
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solAssert(!function->name().empty(), "");
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functions[function->name()].push_back(function);
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}
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findDuplicateDefinitions(functions, "Function with same name and arguments defined twice.");
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}
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2018-11-29 17:23:58 +00:00
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void ContractLevelChecker::checkDuplicateEvents(ContractDefinition const& _contract)
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2018-11-29 16:39:57 +00:00
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{
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/// Checks that two events with the same name defined in this contract have different
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/// argument types
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map<string, vector<EventDefinition const*>> events;
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for (EventDefinition const* event: _contract.events())
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events[event->name()].push_back(event);
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findDuplicateDefinitions(events, "Event with same name and arguments defined twice.");
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}
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template <class T>
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void ContractLevelChecker::findDuplicateDefinitions(map<string, vector<T>> const& _definitions, string _message)
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{
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for (auto const& it: _definitions)
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{
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vector<T> const& overloads = it.second;
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set<size_t> reported;
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for (size_t i = 0; i < overloads.size() && !reported.count(i); ++i)
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{
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SecondarySourceLocation ssl;
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for (size_t j = i + 1; j < overloads.size(); ++j)
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2019-09-16 10:27:54 +00:00
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if (hasEqualNameAndParameters(*overloads[i], *overloads[j]))
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2018-11-29 16:39:57 +00:00
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{
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ssl.append("Other declaration is here:", overloads[j]->location());
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reported.insert(j);
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}
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if (ssl.infos.size() > 0)
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{
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ssl.limitSize(_message);
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m_errorReporter.declarationError(
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overloads[i]->location(),
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ssl,
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_message
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);
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}
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}
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}
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}
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2018-11-29 16:44:38 +00:00
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2020-04-15 10:42:15 +00:00
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void ContractLevelChecker::checkAbstractDefinitions(ContractDefinition const& _contract)
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2018-11-29 16:51:57 +00:00
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{
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2020-04-15 10:42:15 +00:00
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// Collects functions, static variable getters and modifiers. If they
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// override (unimplemented) base class ones, they are replaced.
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set<OverrideProxy, OverrideProxy::CompareBySignature> proxies;
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2018-11-29 16:51:57 +00:00
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2020-04-15 10:42:15 +00:00
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auto registerProxy = [&proxies](OverrideProxy const& _overrideProxy)
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2018-11-30 23:08:42 +00:00
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{
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2020-04-15 10:42:15 +00:00
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// Overwrite an existing proxy, if it exists.
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if (!_overrideProxy.unimplemented())
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proxies.erase(_overrideProxy);
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proxies.insert(_overrideProxy);
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2018-11-30 23:08:42 +00:00
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};
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2020-04-15 10:42:15 +00:00
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// Search from base to derived, collect all functions and modifiers and
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// update proxies.
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2018-11-30 23:08:42 +00:00
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for (ContractDefinition const* contract: boost::adaptors::reverse(_contract.annotation().linearizedBaseContracts))
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{
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for (VariableDeclaration const* v: contract->stateVariables())
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if (v->isPartOfExternalInterface())
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2020-04-15 10:42:15 +00:00
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registerProxy(OverrideProxy(v));
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2018-11-30 23:08:42 +00:00
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for (FunctionDefinition const* function: contract->definedFunctions())
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if (!function->isConstructor())
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2020-04-15 10:42:15 +00:00
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registerProxy(OverrideProxy(function));
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for (ModifierDefinition const* modifier: contract->functionModifiers())
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registerProxy(OverrideProxy(modifier));
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2018-11-30 23:08:42 +00:00
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}
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2018-11-29 16:51:57 +00:00
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// Set to not fully implemented if at least one flag is false.
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2020-04-15 10:42:15 +00:00
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// Note that `_contract.annotation().unimplementedDeclarations` has already been
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2019-11-04 13:12:58 +00:00
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// pre-filled by `checkBaseConstructorArguments`.
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2020-04-15 10:42:15 +00:00
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for (auto const& proxy: proxies)
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if (proxy.unimplemented())
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_contract.annotation().unimplementedDeclarations.push_back(proxy.declaration());
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2019-09-04 22:01:13 +00:00
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2019-11-04 13:12:58 +00:00
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if (_contract.abstract())
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{
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2020-01-07 14:11:29 +00:00
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if (_contract.contractKind() == ContractKind::Interface)
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2019-11-04 13:12:58 +00:00
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m_errorReporter.typeError(_contract.location(), "Interfaces do not need the \"abstract\" keyword, they are abstract implicitly.");
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2020-01-07 14:11:29 +00:00
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else if (_contract.contractKind() == ContractKind::Library)
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2019-11-04 13:12:58 +00:00
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m_errorReporter.typeError(_contract.location(), "Libraries cannot be abstract.");
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else
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2020-01-07 14:11:29 +00:00
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solAssert(_contract.contractKind() == ContractKind::Contract, "");
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2019-11-04 13:12:58 +00:00
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}
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2019-09-04 22:01:13 +00:00
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2019-11-04 13:12:58 +00:00
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// For libraries, we emit errors on function-level, so this is fine as long as we do
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// not have inheritance for libraries.
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2019-09-04 22:01:13 +00:00
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if (
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2020-01-07 14:11:29 +00:00
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_contract.contractKind() == ContractKind::Contract &&
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2019-11-04 13:12:58 +00:00
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!_contract.abstract() &&
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2020-04-15 10:42:15 +00:00
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!_contract.annotation().unimplementedDeclarations.empty()
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2019-09-04 22:01:13 +00:00
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)
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2019-11-08 17:06:40 +00:00
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{
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SecondarySourceLocation ssl;
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2020-04-15 10:42:15 +00:00
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for (auto declaration: _contract.annotation().unimplementedDeclarations)
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ssl.append("Missing implementation: ", declaration->location());
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2019-11-08 17:06:40 +00:00
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m_errorReporter.typeError(_contract.location(), ssl,
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"Contract \"" + _contract.annotation().canonicalName
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+ "\" should be marked as abstract.");
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2020-04-15 10:42:15 +00:00
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2019-11-08 17:06:40 +00:00
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}
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2018-11-29 16:51:57 +00:00
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}
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2018-11-29 16:58:15 +00:00
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2018-11-29 17:23:58 +00:00
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void ContractLevelChecker::checkBaseConstructorArguments(ContractDefinition const& _contract)
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2018-11-29 16:58:15 +00:00
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{
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vector<ContractDefinition const*> const& bases = _contract.annotation().linearizedBaseContracts;
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// Determine the arguments that are used for the base constructors.
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for (ContractDefinition const* contract: bases)
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{
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if (FunctionDefinition const* constructor = contract->constructor())
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for (auto const& modifier: constructor->modifiers())
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if (auto baseContract = dynamic_cast<ContractDefinition const*>(
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modifier->name()->annotation().referencedDeclaration
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))
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{
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if (modifier->arguments())
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{
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if (baseContract->constructor())
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annotateBaseConstructorArguments(_contract, baseContract->constructor(), modifier.get());
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}
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else
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m_errorReporter.declarationError(
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modifier->location(),
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"Modifier-style base constructor call without arguments."
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);
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}
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for (ASTPointer<InheritanceSpecifier> const& base: contract->baseContracts())
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{
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ContractDefinition const* baseContract = dynamic_cast<ContractDefinition const*>(
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base->name().annotation().referencedDeclaration
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);
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solAssert(baseContract, "");
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if (baseContract->constructor() && base->arguments() && !base->arguments()->empty())
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annotateBaseConstructorArguments(_contract, baseContract->constructor(), base.get());
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}
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}
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// check that we get arguments for all base constructors that need it.
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// If not mark the contract as abstract (not fully implemented)
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for (ContractDefinition const* contract: bases)
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if (FunctionDefinition const* constructor = contract->constructor())
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if (contract != &_contract && !constructor->parameters().empty())
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if (!_contract.annotation().baseConstructorArguments.count(constructor))
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2020-04-15 10:42:15 +00:00
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_contract.annotation().unimplementedDeclarations.push_back(constructor);
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2018-11-29 16:58:15 +00:00
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}
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void ContractLevelChecker::annotateBaseConstructorArguments(
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ContractDefinition const& _currentContract,
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FunctionDefinition const* _baseConstructor,
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ASTNode const* _argumentNode
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)
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{
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solAssert(_baseConstructor, "");
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solAssert(_argumentNode, "");
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auto insertionResult = _currentContract.annotation().baseConstructorArguments.insert(
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std::make_pair(_baseConstructor, _argumentNode)
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);
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if (!insertionResult.second)
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{
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ASTNode const* previousNode = insertionResult.first->second;
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SourceLocation const* mainLocation = nullptr;
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SecondarySourceLocation ssl;
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if (
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_currentContract.location().contains(previousNode->location()) ||
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_currentContract.location().contains(_argumentNode->location())
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)
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{
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mainLocation = &previousNode->location();
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ssl.append("Second constructor call is here:", _argumentNode->location());
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}
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else
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{
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mainLocation = &_currentContract.location();
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2019-07-08 12:28:22 +00:00
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ssl.append("First constructor call is here:", _argumentNode->location());
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ssl.append("Second constructor call is here:", previousNode->location());
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2018-11-29 16:58:15 +00:00
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}
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m_errorReporter.declarationError(
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*mainLocation,
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ssl,
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"Base constructor arguments given twice."
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);
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}
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}
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2018-11-29 17:26:53 +00:00
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2018-11-29 17:32:06 +00:00
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void ContractLevelChecker::checkExternalTypeClashes(ContractDefinition const& _contract)
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{
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map<string, vector<pair<Declaration const*, FunctionTypePointer>>> externalDeclarations;
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for (ContractDefinition const* contract: _contract.annotation().linearizedBaseContracts)
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{
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for (FunctionDefinition const* f: contract->definedFunctions())
|
|
|
|
if (f->isPartOfExternalInterface())
|
|
|
|
{
|
2019-04-17 11:40:50 +00:00
|
|
|
auto functionType = TypeProvider::function(*f);
|
2018-11-29 17:32:06 +00:00
|
|
|
// under non error circumstances this should be true
|
|
|
|
if (functionType->interfaceFunctionType())
|
2018-12-10 18:02:39 +00:00
|
|
|
externalDeclarations[functionType->externalSignature()].emplace_back(
|
|
|
|
f, functionType->asCallableFunction(false)
|
2018-11-29 17:32:06 +00:00
|
|
|
);
|
|
|
|
}
|
|
|
|
for (VariableDeclaration const* v: contract->stateVariables())
|
|
|
|
if (v->isPartOfExternalInterface())
|
|
|
|
{
|
2019-04-17 11:40:50 +00:00
|
|
|
auto functionType = TypeProvider::function(*v);
|
2018-11-29 17:32:06 +00:00
|
|
|
// under non error circumstances this should be true
|
|
|
|
if (functionType->interfaceFunctionType())
|
2018-12-10 18:02:39 +00:00
|
|
|
externalDeclarations[functionType->externalSignature()].emplace_back(
|
|
|
|
v, functionType->asCallableFunction(false)
|
2018-11-29 17:32:06 +00:00
|
|
|
);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
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->hasEqualParameterTypes(*it.second[j].second))
|
|
|
|
m_errorReporter.typeError(
|
|
|
|
it.second[j].first->location(),
|
|
|
|
"Function overload clash during conversion to external types for arguments."
|
|
|
|
);
|
|
|
|
}
|
2018-11-29 17:33:54 +00:00
|
|
|
|
|
|
|
void ContractLevelChecker::checkHashCollisions(ContractDefinition const& _contract)
|
|
|
|
{
|
2019-12-11 16:31:36 +00:00
|
|
|
set<util::FixedHash<4>> hashes;
|
2018-11-29 17:33:54 +00:00
|
|
|
for (auto const& it: _contract.interfaceFunctionList())
|
|
|
|
{
|
2019-12-11 16:31:36 +00:00
|
|
|
util::FixedHash<4> const& hash = it.first;
|
2018-11-29 17:33:54 +00:00
|
|
|
if (hashes.count(hash))
|
|
|
|
m_errorReporter.typeError(
|
|
|
|
_contract.location(),
|
|
|
|
string("Function signature hash collision for ") + it.second->externalSignature()
|
|
|
|
);
|
|
|
|
hashes.insert(hash);
|
|
|
|
}
|
|
|
|
}
|
2018-11-29 17:36:26 +00:00
|
|
|
|
|
|
|
void ContractLevelChecker::checkLibraryRequirements(ContractDefinition const& _contract)
|
|
|
|
{
|
|
|
|
if (!_contract.isLibrary())
|
|
|
|
return;
|
|
|
|
|
|
|
|
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");
|
|
|
|
}
|
2019-03-04 13:33:46 +00:00
|
|
|
|
|
|
|
void ContractLevelChecker::checkBaseABICompatibility(ContractDefinition const& _contract)
|
|
|
|
{
|
|
|
|
if (_contract.sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::ABIEncoderV2))
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (_contract.isLibrary())
|
|
|
|
{
|
|
|
|
solAssert(
|
|
|
|
_contract.baseContracts().empty() || m_errorReporter.hasErrors(),
|
|
|
|
"Library is not allowed to inherit"
|
|
|
|
);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
SecondarySourceLocation errors;
|
|
|
|
|
|
|
|
// interfaceFunctionList contains all inherited functions as well
|
|
|
|
for (auto const& func: _contract.interfaceFunctionList())
|
|
|
|
{
|
|
|
|
solAssert(func.second->hasDeclaration(), "Function has no declaration?!");
|
|
|
|
|
|
|
|
if (!func.second->declaration().sourceUnit().annotation().experimentalFeatures.count(ExperimentalFeature::ABIEncoderV2))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
auto const& currentLoc = func.second->declaration().location();
|
|
|
|
|
|
|
|
for (TypePointer const& paramType: func.second->parameterTypes() + func.second->parameterTypes())
|
|
|
|
if (!TypeChecker::typeSupportedByOldABIEncoder(*paramType, false))
|
|
|
|
{
|
2019-12-11 16:05:44 +00:00
|
|
|
errors.append("Type only supported by ABIEncoderV2", currentLoc);
|
2019-03-04 13:33:46 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!errors.infos.empty())
|
|
|
|
m_errorReporter.fatalTypeError(
|
|
|
|
_contract.location(),
|
|
|
|
errors,
|
|
|
|
std::string("Contract \"") +
|
|
|
|
_contract.name() +
|
2019-12-11 16:05:44 +00:00
|
|
|
"\" does not use ABIEncoderV2 but wants to inherit from a contract " +
|
2019-03-04 13:33:46 +00:00
|
|
|
"which uses types that require it. " +
|
|
|
|
"Use \"pragma experimental ABIEncoderV2;\" for the inheriting contract as well to enable the feature."
|
|
|
|
);
|
|
|
|
|
|
|
|
}
|
2019-09-16 12:33:43 +00:00
|
|
|
|
2019-09-09 16:22:02 +00:00
|
|
|
void ContractLevelChecker::checkPayableFallbackWithoutReceive(ContractDefinition const& _contract)
|
|
|
|
{
|
|
|
|
if (auto const* fallback = _contract.fallbackFunction())
|
|
|
|
if (fallback->isPayable() && !_contract.interfaceFunctionList().empty() && !_contract.receiveFunction())
|
|
|
|
m_errorReporter.warning(
|
|
|
|
_contract.location(),
|
|
|
|
"This contract has a payable fallback function, but no receive ether function. Consider adding a receive ether function.",
|
|
|
|
SecondarySourceLocation{}.append("The payable fallback function is defined here.", fallback->location())
|
|
|
|
);
|
|
|
|
}
|