Function reference resolver.

libyul/FunctionReferenceResolver.h

@@ -0,0 +1,48 @@
+/*
+	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/>.
+*/
+// SPDX-License-Identifier: GPL-3.0
+
+#pragma once
+
+#include <libyul/optimiser/ASTWalker.h>
+
+namespace solidity::yul
+{
+
+/**
+ * Resolves references to user-defined functions in function calls.
+ * Assumes the code is correct, i.e. does not check for references to be valid or unique.
+ *
+ * Be careful not to iterate over the result - it is not deterministic.
+ */
+class FunctionReferenceResolver: private ASTWalker
+{
+public:
+	explicit FunctionReferenceResolver(Block const& _ast);
+	std::map<FunctionCall const*, FunctionDefinition const*> const& references() const { return m_functionReferences; }
+
+private:
+	using ASTWalker::operator();
+	void operator()(FunctionCall const& _functionCall) override;
+	void operator()(Block const& _block) override;
+
+	std::map<FunctionCall const*, FunctionDefinition const*> m_functionReferences;
+	std::vector<std::map<YulString, FunctionDefinition const*>> m_scopes;
+};
+
+
+}