mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
697 lines
19 KiB
C++
697 lines
19 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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// SPDX-License-Identifier: GPL-3.0
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#include <libsolidity/analysis/ControlFlowBuilder.h>
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#include <libyul/AST.h>
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#include <libyul/backends/evm/EVMDialect.h>
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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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using namespace std;
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ControlFlowBuilder::ControlFlowBuilder(CFG::NodeContainer& _nodeContainer, FunctionFlow const& _functionFlow):
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m_nodeContainer(_nodeContainer),
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m_currentNode(_functionFlow.entry),
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m_returnNode(_functionFlow.exit),
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m_revertNode(_functionFlow.revert),
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m_transactionReturnNode(_functionFlow.transactionReturn)
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{
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}
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unique_ptr<FunctionFlow> ControlFlowBuilder::createFunctionFlow(
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CFG::NodeContainer& _nodeContainer,
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FunctionDefinition const& _function
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)
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{
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auto functionFlow = make_unique<FunctionFlow>();
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functionFlow->entry = _nodeContainer.newNode();
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functionFlow->exit = _nodeContainer.newNode();
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functionFlow->revert = _nodeContainer.newNode();
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functionFlow->transactionReturn = _nodeContainer.newNode();
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ControlFlowBuilder builder(_nodeContainer, *functionFlow);
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builder.appendControlFlow(_function);
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return functionFlow;
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}
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bool ControlFlowBuilder::visit(BinaryOperation const& _operation)
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{
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solAssert(!!m_currentNode, "");
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switch (_operation.getOperator())
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{
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case Token::Or:
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case Token::And:
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{
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visitNode(_operation);
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appendControlFlow(_operation.leftExpression());
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auto nodes = splitFlow<2>();
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nodes[0] = createFlow(nodes[0], _operation.rightExpression());
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mergeFlow(nodes, nodes[1]);
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return false;
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}
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default:
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return ASTConstVisitor::visit(_operation);
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}
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}
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bool ControlFlowBuilder::visit(Conditional const& _conditional)
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{
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solAssert(!!m_currentNode, "");
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visitNode(_conditional);
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_conditional.condition().accept(*this);
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auto nodes = splitFlow<2>();
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nodes[0] = createFlow(nodes[0], _conditional.trueExpression());
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nodes[1] = createFlow(nodes[1], _conditional.falseExpression());
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mergeFlow(nodes);
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return false;
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}
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bool ControlFlowBuilder::visit(TryStatement const& _tryStatement)
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{
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appendControlFlow(_tryStatement.externalCall());
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auto nodes = splitFlow(_tryStatement.clauses().size());
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for (size_t i = 0; i < _tryStatement.clauses().size(); ++i)
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nodes[i] = createFlow(nodes[i], _tryStatement.clauses()[i]->block());
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mergeFlow(nodes);
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return false;
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}
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bool ControlFlowBuilder::visit(IfStatement const& _ifStatement)
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{
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solAssert(!!m_currentNode, "");
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visitNode(_ifStatement);
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_ifStatement.condition().accept(*this);
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auto nodes = splitFlow<2>();
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nodes[0] = createFlow(nodes[0], _ifStatement.trueStatement());
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if (_ifStatement.falseStatement())
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{
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nodes[1] = createFlow(nodes[1], *_ifStatement.falseStatement());
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mergeFlow(nodes);
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}
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else
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mergeFlow(nodes, nodes[1]);
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return false;
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}
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bool ControlFlowBuilder::visit(ForStatement const& _forStatement)
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{
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solAssert(!!m_currentNode, "");
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visitNode(_forStatement);
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if (_forStatement.initializationExpression())
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_forStatement.initializationExpression()->accept(*this);
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auto condition = createLabelHere();
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if (_forStatement.condition())
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appendControlFlow(*_forStatement.condition());
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auto postPart = newLabel();
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auto nodes = splitFlow<2>();
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auto afterFor = nodes[1];
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m_currentNode = nodes[0];
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{
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BreakContinueScope scope(*this, afterFor, postPart);
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appendControlFlow(_forStatement.body());
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}
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placeAndConnectLabel(postPart);
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if (auto expression = _forStatement.loopExpression())
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appendControlFlow(*expression);
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connect(m_currentNode, condition);
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m_currentNode = afterFor;
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return false;
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}
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bool ControlFlowBuilder::visit(WhileStatement const& _whileStatement)
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{
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solAssert(!!m_currentNode, "");
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visitNode(_whileStatement);
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if (_whileStatement.isDoWhile())
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{
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auto afterWhile = newLabel();
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auto whileBody = createLabelHere();
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auto condition = newLabel();
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{
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BreakContinueScope scope(*this, afterWhile, condition);
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appendControlFlow(_whileStatement.body());
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}
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placeAndConnectLabel(condition);
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appendControlFlow(_whileStatement.condition());
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connect(m_currentNode, whileBody);
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placeAndConnectLabel(afterWhile);
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}
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else
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{
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auto whileCondition = createLabelHere();
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appendControlFlow(_whileStatement.condition());
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auto nodes = splitFlow<2>();
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auto whileBody = nodes[0];
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auto afterWhile = nodes[1];
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m_currentNode = whileBody;
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{
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BreakContinueScope scope(*this, afterWhile, whileCondition);
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appendControlFlow(_whileStatement.body());
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}
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connect(m_currentNode, whileCondition);
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m_currentNode = afterWhile;
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}
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return false;
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}
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bool ControlFlowBuilder::visit(Break const& _break)
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{
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solAssert(!!m_currentNode, "");
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solAssert(!!m_breakJump, "");
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visitNode(_break);
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connect(m_currentNode, m_breakJump);
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m_currentNode = newLabel();
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return false;
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}
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bool ControlFlowBuilder::visit(Continue const& _continue)
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{
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solAssert(!!m_currentNode, "");
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solAssert(!!m_continueJump, "");
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visitNode(_continue);
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connect(m_currentNode, m_continueJump);
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m_currentNode = newLabel();
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return false;
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}
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bool ControlFlowBuilder::visit(Throw const& _throw)
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{
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solAssert(!!m_currentNode, "");
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solAssert(!!m_revertNode, "");
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visitNode(_throw);
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connect(m_currentNode, m_revertNode);
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m_currentNode = newLabel();
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return false;
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}
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bool ControlFlowBuilder::visit(RevertStatement const& _revert)
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{
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solAssert(!!m_currentNode, "");
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solAssert(!!m_revertNode, "");
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visitNode(_revert);
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connect(m_currentNode, m_revertNode);
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m_currentNode = newLabel();
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return false;
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}
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bool ControlFlowBuilder::visit(PlaceholderStatement const&)
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{
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solAssert(!!m_currentNode, "");
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solAssert(!!m_placeholderEntry, "");
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solAssert(!!m_placeholderExit, "");
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connect(m_currentNode, m_placeholderEntry);
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m_currentNode = newLabel();
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connect(m_placeholderExit, m_currentNode);
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return false;
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}
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bool ControlFlowBuilder::visit(FunctionCall const& _functionCall)
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{
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solAssert(!!m_revertNode, "");
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solAssert(!!m_currentNode, "");
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solAssert(!!_functionCall.expression().annotation().type, "");
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if (auto functionType = dynamic_cast<FunctionType const*>(_functionCall.expression().annotation().type))
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switch (functionType->kind())
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{
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case FunctionType::Kind::Revert:
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visitNode(_functionCall);
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_functionCall.expression().accept(*this);
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ASTNode::listAccept(_functionCall.arguments(), *this);
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connect(m_currentNode, m_revertNode);
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m_currentNode = newLabel();
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return false;
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case FunctionType::Kind::Require:
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case FunctionType::Kind::Assert:
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{
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visitNode(_functionCall);
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_functionCall.expression().accept(*this);
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ASTNode::listAccept(_functionCall.arguments(), *this);
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connect(m_currentNode, m_revertNode);
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auto nextNode = newLabel();
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connect(m_currentNode, nextNode);
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m_currentNode = nextNode;
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return false;
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}
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case FunctionType::Kind::Internal:
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{
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visitNode(_functionCall);
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_functionCall.expression().accept(*this);
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ASTNode::listAccept(_functionCall.arguments(), *this);
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m_currentNode->functionCalls.emplace_back(&_functionCall);
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auto nextNode = newLabel();
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connect(m_currentNode, nextNode);
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m_currentNode = nextNode;
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return false;
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}
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default:
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break;
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}
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return ASTConstVisitor::visit(_functionCall);
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}
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bool ControlFlowBuilder::visit(ModifierInvocation const& _modifierInvocation)
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{
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if (auto arguments = _modifierInvocation.arguments())
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for (auto& argument: *arguments)
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appendControlFlow(*argument);
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auto modifierDefinition = dynamic_cast<ModifierDefinition const*>(
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_modifierInvocation.name().annotation().referencedDeclaration
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);
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if (!modifierDefinition) return false;
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if (!modifierDefinition->isImplemented()) return false;
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solAssert(!!m_returnNode, "");
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m_placeholderEntry = newLabel();
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m_placeholderExit = newLabel();
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appendControlFlow(*modifierDefinition);
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connect(m_currentNode, m_returnNode);
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m_currentNode = m_placeholderEntry;
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m_returnNode = m_placeholderExit;
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m_placeholderEntry = nullptr;
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m_placeholderExit = nullptr;
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return false;
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}
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bool ControlFlowBuilder::visit(FunctionDefinition const& _functionDefinition)
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{
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for (auto const& parameter: _functionDefinition.parameters())
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appendControlFlow(*parameter);
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for (auto const& returnParameter: _functionDefinition.returnParameters())
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{
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appendControlFlow(*returnParameter);
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m_returnNode->variableOccurrences.emplace_back(
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*returnParameter,
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VariableOccurrence::Kind::Return
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);
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}
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for (auto const& modifier: _functionDefinition.modifiers())
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appendControlFlow(*modifier);
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appendControlFlow(_functionDefinition.body());
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connect(m_currentNode, m_returnNode);
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m_currentNode = nullptr;
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return false;
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}
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bool ControlFlowBuilder::visit(Return const& _return)
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{
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solAssert(!!m_currentNode, "");
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solAssert(!!m_returnNode, "");
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visitNode(_return);
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if (_return.expression())
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{
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appendControlFlow(*_return.expression());
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// Returns with return expression are considered to be assignments to the return parameters.
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for (auto returnParameter: _return.annotation().functionReturnParameters->parameters())
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m_currentNode->variableOccurrences.emplace_back(
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*returnParameter,
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VariableOccurrence::Kind::Assignment,
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_return.location()
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);
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}
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connect(m_currentNode, m_returnNode);
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m_currentNode = newLabel();
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return false;
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}
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bool ControlFlowBuilder::visit(FunctionTypeName const& _functionTypeName)
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{
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visitNode(_functionTypeName);
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// Do not visit the parameters and return values of a function type name.
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// We do not want to consider them as variable declarations for the control flow graph.
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return false;
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}
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bool ControlFlowBuilder::visit(InlineAssembly const& _inlineAssembly)
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{
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solAssert(!!m_currentNode && !m_inlineAssembly, "");
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m_inlineAssembly = &_inlineAssembly;
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(*this)(_inlineAssembly.operations());
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m_inlineAssembly = nullptr;
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return false;
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}
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void ControlFlowBuilder::visit(yul::Statement const& _statement)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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m_currentNode->location = langutil::SourceLocation::smallestCovering(m_currentNode->location, locationOf(_statement));
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ASTWalker::visit(_statement);
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}
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void ControlFlowBuilder::operator()(yul::If const& _if)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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visit(*_if.condition);
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auto nodes = splitFlow<2>();
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m_currentNode = nodes[0];
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(*this)(_if.body);
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nodes[0] = m_currentNode;
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mergeFlow(nodes, nodes[1]);
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}
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void ControlFlowBuilder::operator()(yul::Switch const& _switch)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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visit(*_switch.expression);
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auto beforeSwitch = m_currentNode;
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auto nodes = splitFlow(_switch.cases.size());
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for (size_t i = 0u; i < _switch.cases.size(); ++i)
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{
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m_currentNode = nodes[i];
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(*this)(_switch.cases[i].body);
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nodes[i] = m_currentNode;
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}
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mergeFlow(nodes);
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bool hasDefault = util::contains_if(_switch.cases, [](yul::Case const& _case) { return !_case.value; });
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if (!hasDefault)
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connect(beforeSwitch, m_currentNode);
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}
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void ControlFlowBuilder::operator()(yul::ForLoop const& _forLoop)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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(*this)(_forLoop.pre);
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auto condition = createLabelHere();
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if (_forLoop.condition)
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visit(*_forLoop.condition);
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auto loopExpression = newLabel();
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auto nodes = splitFlow<2>();
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auto afterFor = nodes[1];
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m_currentNode = nodes[0];
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{
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BreakContinueScope scope(*this, afterFor, loopExpression);
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(*this)(_forLoop.body);
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}
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placeAndConnectLabel(loopExpression);
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(*this)(_forLoop.post);
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connect(m_currentNode, condition);
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m_currentNode = afterFor;
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}
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void ControlFlowBuilder::operator()(yul::Break const&)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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solAssert(m_breakJump, "");
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connect(m_currentNode, m_breakJump);
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m_currentNode = newLabel();
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}
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void ControlFlowBuilder::operator()(yul::Continue const&)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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solAssert(m_continueJump, "");
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connect(m_currentNode, m_continueJump);
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m_currentNode = newLabel();
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}
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void ControlFlowBuilder::operator()(yul::Identifier const& _identifier)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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auto const& externalReferences = m_inlineAssembly->annotation().externalReferences;
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if (externalReferences.count(&_identifier))
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{
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if (auto const* declaration = dynamic_cast<VariableDeclaration const*>(externalReferences.at(&_identifier).declaration))
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m_currentNode->variableOccurrences.emplace_back(
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*declaration,
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VariableOccurrence::Kind::Access,
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_identifier.debugData->location
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);
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}
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}
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void ControlFlowBuilder::operator()(yul::Assignment const& _assignment)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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visit(*_assignment.value);
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auto const& externalReferences = m_inlineAssembly->annotation().externalReferences;
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for (auto const& variable: _assignment.variableNames)
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if (externalReferences.count(&variable))
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if (auto const* declaration = dynamic_cast<VariableDeclaration const*>(externalReferences.at(&variable).declaration))
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m_currentNode->variableOccurrences.emplace_back(
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*declaration,
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VariableOccurrence::Kind::Assignment,
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variable.debugData->location
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);
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}
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void ControlFlowBuilder::operator()(yul::FunctionCall const& _functionCall)
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{
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using namespace yul;
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solAssert(m_currentNode && m_inlineAssembly, "");
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yul::ASTWalker::operator()(_functionCall);
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if (auto const *builtinFunction = m_inlineAssembly->dialect().builtin(_functionCall.functionName.name))
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if (builtinFunction->controlFlowSideEffects.terminates)
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{
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if (builtinFunction->controlFlowSideEffects.reverts)
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connect(m_currentNode, m_revertNode);
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else
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connect(m_currentNode, m_transactionReturnNode);
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m_currentNode = newLabel();
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}
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}
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void ControlFlowBuilder::operator()(yul::FunctionDefinition const&)
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{
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solAssert(m_currentNode && m_inlineAssembly, "");
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// External references cannot be accessed from within functions, so we can ignore their control flow.
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// TODO: we might still want to track if they always revert or return, though.
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}
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void ControlFlowBuilder::operator()(yul::Leave const&)
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{
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// This has to be implemented, if we ever decide to visit functions.
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solUnimplementedAssert(false, "");
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}
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bool ControlFlowBuilder::visit(VariableDeclaration const& _variableDeclaration)
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{
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solAssert(!!m_currentNode, "");
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visitNode(_variableDeclaration);
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m_currentNode->variableOccurrences.emplace_back(
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_variableDeclaration,
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VariableOccurrence::Kind::Declaration
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);
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// Handle declaration with immediate assignment.
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if (_variableDeclaration.value())
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m_currentNode->variableOccurrences.emplace_back(
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_variableDeclaration,
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VariableOccurrence::Kind::Assignment,
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_variableDeclaration.value()->location()
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);
|
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// Function arguments are considered to be immediately assigned as well (they are "externally assigned").
|
|
else if (_variableDeclaration.isCallableOrCatchParameter() && !_variableDeclaration.isReturnParameter())
|
|
m_currentNode->variableOccurrences.emplace_back(
|
|
_variableDeclaration,
|
|
VariableOccurrence::Kind::Assignment
|
|
);
|
|
return true;
|
|
}
|
|
|
|
bool ControlFlowBuilder::visit(VariableDeclarationStatement const& _variableDeclarationStatement)
|
|
{
|
|
solAssert(!!m_currentNode, "");
|
|
visitNode(_variableDeclarationStatement);
|
|
|
|
for (auto const& var: _variableDeclarationStatement.declarations())
|
|
if (var)
|
|
var->accept(*this);
|
|
if (_variableDeclarationStatement.initialValue())
|
|
{
|
|
_variableDeclarationStatement.initialValue()->accept(*this);
|
|
for (size_t i = 0; i < _variableDeclarationStatement.declarations().size(); i++)
|
|
if (auto const& var = _variableDeclarationStatement.declarations()[i])
|
|
{
|
|
auto expression = _variableDeclarationStatement.initialValue();
|
|
if (auto tupleExpression = dynamic_cast<TupleExpression const*>(expression))
|
|
if (tupleExpression->components().size() > 1)
|
|
{
|
|
solAssert(tupleExpression->components().size() > i, "");
|
|
expression = tupleExpression->components()[i].get();
|
|
}
|
|
while (auto tupleExpression = dynamic_cast<TupleExpression const*>(expression))
|
|
if (tupleExpression->components().size() == 1)
|
|
expression = tupleExpression->components().front().get();
|
|
else
|
|
break;
|
|
m_currentNode->variableOccurrences.emplace_back(
|
|
*var,
|
|
VariableOccurrence::Kind::Assignment,
|
|
expression ? std::make_optional(expression->location()) : std::optional<langutil::SourceLocation>{}
|
|
);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool ControlFlowBuilder::visit(Identifier const& _identifier)
|
|
{
|
|
solAssert(!!m_currentNode, "");
|
|
visitNode(_identifier);
|
|
|
|
if (auto const* variableDeclaration = dynamic_cast<VariableDeclaration const*>(_identifier.annotation().referencedDeclaration))
|
|
m_currentNode->variableOccurrences.emplace_back(
|
|
*variableDeclaration,
|
|
static_cast<Expression const&>(_identifier).annotation().willBeWrittenTo ?
|
|
VariableOccurrence::Kind::Assignment :
|
|
VariableOccurrence::Kind::Access,
|
|
_identifier.location()
|
|
);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ControlFlowBuilder::visitNode(ASTNode const& _node)
|
|
{
|
|
solAssert(!!m_currentNode, "");
|
|
m_currentNode->location = langutil::SourceLocation::smallestCovering(m_currentNode->location, _node.location());
|
|
return true;
|
|
}
|
|
|
|
void ControlFlowBuilder::appendControlFlow(ASTNode const& _node)
|
|
{
|
|
_node.accept(*this);
|
|
}
|
|
|
|
CFGNode* ControlFlowBuilder::createFlow(CFGNode* _entry, ASTNode const& _node)
|
|
{
|
|
auto oldCurrentNode = m_currentNode;
|
|
m_currentNode = _entry;
|
|
appendControlFlow(_node);
|
|
auto endNode = m_currentNode;
|
|
m_currentNode = oldCurrentNode;
|
|
return endNode;
|
|
}
|
|
|
|
void ControlFlowBuilder::connect(CFGNode* _from, CFGNode* _to)
|
|
{
|
|
solAssert(_from, "");
|
|
solAssert(_to, "");
|
|
_from->exits.push_back(_to);
|
|
_to->entries.push_back(_from);
|
|
}
|
|
|
|
CFGNode* ControlFlowBuilder::newLabel()
|
|
{
|
|
return m_nodeContainer.newNode();
|
|
}
|
|
|
|
CFGNode* ControlFlowBuilder::createLabelHere()
|
|
{
|
|
auto label = m_nodeContainer.newNode();
|
|
connect(m_currentNode, label);
|
|
m_currentNode = label;
|
|
return label;
|
|
}
|
|
|
|
void ControlFlowBuilder::placeAndConnectLabel(CFGNode* _node)
|
|
{
|
|
connect(m_currentNode, _node);
|
|
m_currentNode = _node;
|
|
}
|
|
|
|
ControlFlowBuilder::BreakContinueScope::BreakContinueScope(
|
|
ControlFlowBuilder& _parser,
|
|
CFGNode* _breakJump,
|
|
CFGNode* _continueJump
|
|
): m_parser(_parser), m_origBreakJump(_parser.m_breakJump), m_origContinueJump(_parser.m_continueJump)
|
|
{
|
|
m_parser.m_breakJump = _breakJump;
|
|
m_parser.m_continueJump = _continueJump;
|
|
}
|
|
|
|
ControlFlowBuilder::BreakContinueScope::~BreakContinueScope()
|
|
{
|
|
m_parser.m_breakJump = m_origBreakJump;
|
|
m_parser.m_continueJump = m_origContinueJump;
|
|
}
|