1 files changed, 74 insertions, 0 deletions
diff --git a/libyul/optimiser/NameCollector.cpp b/libyul/optimiser/NameCollector.cpp
new file mode 100644
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--- /dev/null
+++ b/libyul/optimiser/NameCollector.cpp
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+/*
+	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/>.
+*/
+/**
+ * Specific AST walker that collects all defined names.
+ */
+
+#include <libyul/optimiser/NameCollector.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+
+using namespace std;
+using namespace dev;
+using namespace dev::yul;
+
+void NameCollector::operator()(VariableDeclaration const& _varDecl)
+{
+	for (auto const& var: _varDecl.variables)
+		m_names.insert(var.name);
+}
+
+void NameCollector::operator ()(FunctionDefinition const& _funDef)
+{
+	m_names.insert(_funDef.name);
+	for (auto const arg: _funDef.parameters)
+		m_names.insert(arg.name);
+	for (auto const ret: _funDef.returnVariables)
+		m_names.insert(ret.name);
+	ASTWalker::operator ()(_funDef);
+}
+
+void ReferencesCounter::operator()(Identifier const& _identifier)
+{
+	++m_references[_identifier.name];
+}
+
+void ReferencesCounter::operator()(FunctionCall const& _funCall)
+{
+	++m_references[_funCall.functionName.name];
+	ASTWalker::operator()(_funCall);
+}
+
+map<string, size_t> ReferencesCounter::countReferences(Block const& _block)
+{
+	ReferencesCounter counter;
+	counter(_block);
+	return counter.references();
+}
+
+map<string, size_t> ReferencesCounter::countReferences(Expression const& _expression)
+{
+	ReferencesCounter counter;
+	counter.visit(_expression);
+	return counter.references();
+}
+
+void Assignments::operator()(Assignment const& _assignment)
+{
+	for (auto const& var: _assignment.variableNames)
+		m_names.insert(var.name);
+}