1 files changed, 39 insertions, 0 deletions
diff --git a/libyul/optimiser/Substitution.cpp b/libyul/optimiser/Substitution.cpp
new file mode 100644
index 00000000..eafe1da9
--- /dev/null
+++ b/libyul/optimiser/Substitution.cpp
@@ -0,0 +1,39 @@
+/*
+	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 copier that replaces certain identifiers with expressions.
+ */
+
+#include <libyul/optimiser/Substitution.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+
+using namespace std;
+using namespace dev;
+using namespace dev::julia;
+
+Expression Substitution::translate(Expression const& _expression)
+{
+	if (_expression.type() == typeid(Identifier))
+	{
+		string const& name = boost::get<Identifier>(_expression).name;
+		if (m_substitutions.count(name))
+			// No recursive substitution
+			return ASTCopier().translate(*m_substitutions.at(name));
+	}
+	return ASTCopier::translate(_expression);
+}