mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
490 lines
13 KiB
C++
490 lines
13 KiB
C++
/*
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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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* Analyzer part of inline assembly.
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*/
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#include <libsolidity/inlineasm/AsmAnalysis.h>
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#include <libsolidity/inlineasm/AsmData.h>
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#include <libsolidity/inlineasm/AsmScopeFiller.h>
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#include <libsolidity/inlineasm/AsmScope.h>
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#include <libsolidity/inlineasm/AsmAnalysisInfo.h>
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#include <libsolidity/interface/ErrorReporter.h>
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#include <boost/range/adaptor/reversed.hpp>
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#include <boost/algorithm/string.hpp>
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#include <memory>
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#include <functional>
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using namespace std;
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using namespace dev;
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using namespace dev::solidity;
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using namespace dev::solidity::assembly;
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namespace {
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set<string> const builtinTypes{"bool", "u8", "s8", "u32", "s32", "u64", "s64", "u128", "s128", "u256", "s256"};
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}
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bool AsmAnalyzer::analyze(Block const& _block)
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{
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if (!(ScopeFiller(m_info, m_errorReporter))(_block))
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return false;
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return (*this)(_block);
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}
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bool AsmAnalyzer::operator()(Label const& _label)
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{
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solAssert(!m_julia, "");
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m_info.stackHeightInfo[&_label] = m_stackHeight;
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return true;
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}
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bool AsmAnalyzer::operator()(assembly::Instruction const& _instruction)
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{
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solAssert(!m_julia, "");
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auto const& info = instructionInfo(_instruction.instruction);
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m_stackHeight += info.ret - info.args;
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m_info.stackHeightInfo[&_instruction] = m_stackHeight;
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warnOnFutureInstruction(_instruction.instruction, _instruction.location);
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return true;
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}
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bool AsmAnalyzer::operator()(assembly::Literal const& _literal)
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{
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expectValidType(_literal.type, _literal.location);
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++m_stackHeight;
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if (_literal.kind == assembly::LiteralKind::String && _literal.value.size() > 32)
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{
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m_errorReporter.typeError(
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_literal.location,
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"String literal too long (" + boost::lexical_cast<std::string>(_literal.value.size()) + " > 32)"
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);
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return false;
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}
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m_info.stackHeightInfo[&_literal] = m_stackHeight;
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return true;
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}
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bool AsmAnalyzer::operator()(assembly::Identifier const& _identifier)
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{
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size_t numErrorsBefore = m_errorReporter.errors().size();
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bool success = true;
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if (m_currentScope->lookup(_identifier.name, Scope::Visitor(
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[&](Scope::Variable const& _var)
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{
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if (!m_activeVariables.count(&_var))
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{
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m_errorReporter.declarationError(
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_identifier.location,
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"Variable " + _identifier.name + " used before it was declared."
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);
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success = false;
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}
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++m_stackHeight;
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},
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[&](Scope::Label const&)
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{
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++m_stackHeight;
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},
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[&](Scope::Function const&)
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{
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m_errorReporter.typeError(
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_identifier.location,
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"Function " + _identifier.name + " used without being called."
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);
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success = false;
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}
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)))
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{
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}
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else
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{
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size_t stackSize(-1);
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if (m_resolver)
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{
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bool insideFunction = m_currentScope->insideFunction();
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stackSize = m_resolver(_identifier, julia::IdentifierContext::RValue, insideFunction);
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}
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if (stackSize == size_t(-1))
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{
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// Only add an error message if the callback did not do it.
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if (numErrorsBefore == m_errorReporter.errors().size())
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m_errorReporter.declarationError(_identifier.location, "Identifier not found.");
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success = false;
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}
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m_stackHeight += stackSize == size_t(-1) ? 1 : stackSize;
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}
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m_info.stackHeightInfo[&_identifier] = m_stackHeight;
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return success;
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}
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bool AsmAnalyzer::operator()(FunctionalInstruction const& _instr)
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{
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solAssert(!m_julia, "");
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bool success = true;
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for (auto const& arg: _instr.arguments | boost::adaptors::reversed)
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if (!expectExpression(arg))
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success = false;
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// Parser already checks that the number of arguments is correct.
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solAssert(instructionInfo(_instr.instruction.instruction).args == int(_instr.arguments.size()), "");
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if (!(*this)(_instr.instruction))
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success = false;
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m_info.stackHeightInfo[&_instr] = m_stackHeight;
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warnOnFutureInstruction(_instr.instruction.instruction, _instr.location);
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return success;
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}
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bool AsmAnalyzer::operator()(assembly::StackAssignment const& _assignment)
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{
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solAssert(!m_julia, "");
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bool success = checkAssignment(_assignment.variableName, size_t(-1));
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m_info.stackHeightInfo[&_assignment] = m_stackHeight;
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return success;
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}
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bool AsmAnalyzer::operator()(assembly::Assignment const& _assignment)
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{
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int const stackHeight = m_stackHeight;
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bool success = boost::apply_visitor(*this, *_assignment.value);
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solAssert(m_stackHeight >= stackHeight, "Negative value size.");
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if (!checkAssignment(_assignment.variableName, m_stackHeight - stackHeight))
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success = false;
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m_info.stackHeightInfo[&_assignment] = m_stackHeight;
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return success;
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}
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bool AsmAnalyzer::operator()(assembly::VariableDeclaration const& _varDecl)
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{
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int const expectedItems = _varDecl.variables.size();
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int const stackHeight = m_stackHeight;
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bool success = boost::apply_visitor(*this, *_varDecl.value);
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if ((m_stackHeight - stackHeight) != expectedItems)
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{
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m_errorReporter.declarationError(_varDecl.location, "Variable count mismatch.");
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return false;
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}
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for (auto const& variable: _varDecl.variables)
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{
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expectValidType(variable.type, variable.location);
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m_activeVariables.insert(&boost::get<Scope::Variable>(m_currentScope->identifiers.at(variable.name)));
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}
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m_info.stackHeightInfo[&_varDecl] = m_stackHeight;
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return success;
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}
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bool AsmAnalyzer::operator()(assembly::FunctionDefinition const& _funDef)
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{
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Block const* virtualBlock = m_info.virtualBlocks.at(&_funDef).get();
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solAssert(virtualBlock, "");
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Scope& varScope = scope(virtualBlock);
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for (auto const& var: _funDef.arguments + _funDef.returns)
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{
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expectValidType(var.type, var.location);
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m_activeVariables.insert(&boost::get<Scope::Variable>(varScope.identifiers.at(var.name)));
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}
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int const stackHeight = m_stackHeight;
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m_stackHeight = _funDef.arguments.size() + _funDef.returns.size();
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bool success = (*this)(_funDef.body);
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m_stackHeight = stackHeight;
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m_info.stackHeightInfo[&_funDef] = m_stackHeight;
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return success;
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}
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bool AsmAnalyzer::operator()(assembly::FunctionCall const& _funCall)
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{
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bool success = true;
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size_t arguments = 0;
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size_t returns = 0;
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if (!m_currentScope->lookup(_funCall.functionName.name, Scope::Visitor(
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[&](Scope::Variable const&)
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{
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m_errorReporter.typeError(
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_funCall.functionName.location,
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"Attempt to call variable instead of function."
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);
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success = false;
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},
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[&](Scope::Label const&)
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{
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m_errorReporter.typeError(
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_funCall.functionName.location,
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"Attempt to call label instead of function."
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);
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success = false;
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},
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[&](Scope::Function const& _fun)
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{
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/// TODO: compare types too
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arguments = _fun.arguments.size();
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returns = _fun.returns.size();
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}
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)))
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{
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m_errorReporter.declarationError(_funCall.functionName.location, "Function not found.");
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success = false;
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}
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if (success)
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{
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if (_funCall.arguments.size() != arguments)
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{
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m_errorReporter.typeError(
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_funCall.functionName.location,
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"Expected " + boost::lexical_cast<string>(arguments) + " arguments but got " +
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boost::lexical_cast<string>(_funCall.arguments.size()) + "."
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);
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success = false;
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}
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}
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for (auto const& arg: _funCall.arguments | boost::adaptors::reversed)
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if (!expectExpression(arg))
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success = false;
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m_stackHeight += int(returns) - int(arguments);
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m_info.stackHeightInfo[&_funCall] = m_stackHeight;
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return success;
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}
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bool AsmAnalyzer::operator()(Switch const& _switch)
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{
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bool success = true;
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if (!expectExpression(*_switch.expression))
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success = false;
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set<tuple<LiteralKind, string>> cases;
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for (auto const& _case: _switch.cases)
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{
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if (_case.value)
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{
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int const initialStackHeight = m_stackHeight;
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// We cannot use "expectExpression" here because *_case.value is not a
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// Statement and would be converted to a Statement otherwise.
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if (!(*this)(*_case.value))
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success = false;
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expectDeposit(1, initialStackHeight, _case.value->location);
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m_stackHeight--;
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/// Note: the parser ensures there is only one default case
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auto val = make_tuple(_case.value->kind, _case.value->value);
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if (!cases.insert(val).second)
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{
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m_errorReporter.declarationError(
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_case.location,
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"Duplicate case defined"
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);
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success = false;
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}
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}
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if (!(*this)(_case.body))
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success = false;
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}
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m_stackHeight--;
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m_info.stackHeightInfo[&_switch] = m_stackHeight;
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return success;
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}
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bool AsmAnalyzer::operator()(assembly::ForLoop const& _for)
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{
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Scope* originalScope = m_currentScope;
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bool success = true;
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if (!(*this)(_for.pre))
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success = false;
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// The block was closed already, but we re-open it again and stuff the
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// condition, the body and the post part inside.
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m_stackHeight += scope(&_for.pre).numberOfVariables();
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m_currentScope = &scope(&_for.pre);
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if (!expectExpression(*_for.condition))
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success = false;
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m_stackHeight--;
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if (!(*this)(_for.body))
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success = false;
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if (!(*this)(_for.post))
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success = false;
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m_stackHeight -= scope(&_for.pre).numberOfVariables();
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m_info.stackHeightInfo[&_for] = m_stackHeight;
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m_currentScope = originalScope;
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return success;
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}
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bool AsmAnalyzer::operator()(Block const& _block)
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{
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bool success = true;
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auto previousScope = m_currentScope;
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m_currentScope = &scope(&_block);
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int const initialStackHeight = m_stackHeight;
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for (auto const& s: _block.statements)
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if (!boost::apply_visitor(*this, s))
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success = false;
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m_stackHeight -= scope(&_block).numberOfVariables();
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int const stackDiff = m_stackHeight - initialStackHeight;
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if (stackDiff != 0)
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{
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m_errorReporter.declarationError(
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_block.location,
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"Unbalanced stack at the end of a block: " +
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(
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stackDiff > 0 ?
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to_string(stackDiff) + string(" surplus item(s).") :
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to_string(-stackDiff) + string(" missing item(s).")
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)
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);
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success = false;
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}
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m_info.stackHeightInfo[&_block] = m_stackHeight;
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m_currentScope = previousScope;
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return success;
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}
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bool AsmAnalyzer::expectExpression(Statement const& _statement)
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{
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bool success = true;
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int const initialHeight = m_stackHeight;
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if (!boost::apply_visitor(*this, _statement))
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success = false;
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if (!expectDeposit(1, initialHeight, locationOf(_statement)))
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success = false;
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return success;
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}
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bool AsmAnalyzer::expectDeposit(int _deposit, int _oldHeight, SourceLocation const& _location)
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{
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if (m_stackHeight - _oldHeight != _deposit)
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{
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m_errorReporter.typeError(
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_location,
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"Expected expression to return one item to the stack, but did return " +
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boost::lexical_cast<string>(m_stackHeight - _oldHeight) +
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" items."
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);
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return false;
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}
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return true;
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}
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bool AsmAnalyzer::checkAssignment(assembly::Identifier const& _variable, size_t _valueSize)
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{
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bool success = true;
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size_t numErrorsBefore = m_errorReporter.errors().size();
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size_t variableSize(-1);
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if (Scope::Identifier const* var = m_currentScope->lookup(_variable.name))
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{
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// Check that it is a variable
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if (var->type() != typeid(Scope::Variable))
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{
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m_errorReporter.typeError(_variable.location, "Assignment requires variable.");
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success = false;
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}
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else if (!m_activeVariables.count(&boost::get<Scope::Variable>(*var)))
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{
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m_errorReporter.declarationError(
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_variable.location,
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"Variable " + _variable.name + " used before it was declared."
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);
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success = false;
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}
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variableSize = 1;
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}
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else if (m_resolver)
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{
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bool insideFunction = m_currentScope->insideFunction();
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variableSize = m_resolver(_variable, julia::IdentifierContext::LValue, insideFunction);
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}
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if (variableSize == size_t(-1))
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{
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// Only add message if the callback did not.
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if (numErrorsBefore == m_errorReporter.errors().size())
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m_errorReporter.declarationError(_variable.location, "Variable not found or variable not lvalue.");
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success = false;
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}
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if (_valueSize == size_t(-1))
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_valueSize = variableSize == size_t(-1) ? 1 : variableSize;
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m_stackHeight -= _valueSize;
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if (_valueSize != variableSize && variableSize != size_t(-1))
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{
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m_errorReporter.typeError(
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_variable.location,
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"Variable size (" +
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to_string(variableSize) +
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") and value size (" +
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to_string(_valueSize) +
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") do not match."
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);
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success = false;
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}
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return success;
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}
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Scope& AsmAnalyzer::scope(Block const* _block)
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{
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solAssert(m_info.scopes.count(_block) == 1, "Scope requested but not present.");
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auto scopePtr = m_info.scopes.at(_block);
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solAssert(scopePtr, "Scope requested but not present.");
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return *scopePtr;
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}
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void AsmAnalyzer::expectValidType(string const& type, SourceLocation const& _location)
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{
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if (!m_julia)
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return;
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if (!builtinTypes.count(type))
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m_errorReporter.typeError(
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_location,
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"\"" + type + "\" is not a valid type (user defined types are not yet supported)."
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);
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}
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void AsmAnalyzer::warnOnFutureInstruction(solidity::Instruction _instr, SourceLocation const& _location)
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{
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static set<solidity::Instruction> futureInstructions{
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solidity::Instruction::CREATE2,
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solidity::Instruction::RETURNDATACOPY,
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solidity::Instruction::RETURNDATASIZE,
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solidity::Instruction::STATICCALL
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};
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if (futureInstructions.count(_instr))
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m_errorReporter.warning(
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_location,
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"The \"" +
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boost::to_lower_copy(instructionInfo(_instr).name)
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+ "\" instruction is only available after " +
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"the Metropolis hard fork. Before that it acts as an invalid instruction."
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);
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}
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