Add control flow analyzer and test for uninitialized storage returns.

libsolidity/analysis/ControlFlowAnalyzer.h

@@ -0,0 +1,52 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <libsolidity/analysis/ControlFlowGraph.h>
+
+#include <set>
+
+namespace dev
+{
+namespace solidity
+{
+
+class ControlFlowAnalyzer: private ASTConstVisitor
+{
+public:
+	explicit ControlFlowAnalyzer(CFG const& _cfg, ErrorReporter& _errorReporter):
+		m_cfg(_cfg), m_errorReporter(_errorReporter) {}
+
+	bool analyze(ASTNode const& _astRoot);
+
+	virtual bool visit(FunctionDefinition const& _function) override;
+
+private:
+	static std::set<VariableDeclaration const*> variablesAssignedInNode(CFGNode const *node);
+	void checkUnassignedStorageReturnValues(
+		FunctionDefinition const& _function,
+		CFGNode const* _functionEntry,
+		CFGNode const* _functionExit
+	) const;
+
+	CFG const& m_cfg;
+	ErrorReporter& m_errorReporter;
+};
+
+}
+}