1 files changed, 157 insertions, 0 deletions
diff --git a/libyul/optimiser/ASTWalker.cpp b/libyul/optimiser/ASTWalker.cpp
new file mode 100644
index 00000000..e29dda6b
--- /dev/null
+++ b/libyul/optimiser/ASTWalker.cpp
@@ -0,0 +1,157 @@
+/*
+	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/>.
+*/
+/**
+ * Generic AST walker.
+ */
+
+#include <libyul/optimiser/ASTWalker.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+
+#include <boost/range/adaptor/reversed.hpp>
+
+using namespace std;
+using namespace dev;
+using namespace dev::yul;
+using namespace dev::solidity;
+
+
+void ASTWalker::operator()(FunctionalInstruction const& _instr)
+{
+	walkVector(_instr.arguments | boost::adaptors::reversed);
+}
+
+void ASTWalker::operator()(FunctionCall const& _funCall)
+{
+	walkVector(_funCall.arguments | boost::adaptors::reversed);
+}
+
+void ASTWalker::operator()(ExpressionStatement const& _statement)
+{
+	visit(_statement.expression);
+}
+
+void ASTWalker::operator()(Assignment const& _assignment)
+{
+	for (auto const& name: _assignment.variableNames)
+		(*this)(name);
+	visit(*_assignment.value);
+}
+
+void ASTWalker::operator()(VariableDeclaration const& _varDecl)
+{
+	if (_varDecl.value)
+		visit(*_varDecl.value);
+}
+
+void ASTWalker::operator()(If const& _if)
+{
+	visit(*_if.condition);
+	(*this)(_if.body);
+}
+
+void ASTWalker::operator()(Switch const& _switch)
+{
+	visit(*_switch.expression);
+	for (auto const& _case: _switch.cases)
+	{
+		if (_case.value)
+			(*this)(*_case.value);
+		(*this)(_case.body);
+	}
+}
+
+void ASTWalker::operator()(FunctionDefinition const& _fun)
+{
+	(*this)(_fun.body);
+}
+
+void ASTWalker::operator()(ForLoop const& _for)
+{
+	(*this)(_for.pre);
+	visit(*_for.condition);
+	(*this)(_for.body);
+	(*this)(_for.post);
+}
+
+void ASTWalker::operator()(Block const& _block)
+{
+	walkVector(_block.statements);
+}
+
+void ASTModifier::operator()(FunctionalInstruction& _instr)
+{
+	walkVector(_instr.arguments | boost::adaptors::reversed);
+}
+
+void ASTModifier::operator()(FunctionCall& _funCall)
+{
+	walkVector(_funCall.arguments | boost::adaptors::reversed);
+}
+
+void ASTModifier::operator()(ExpressionStatement& _statement)
+{
+	visit(_statement.expression);
+}
+
+void ASTModifier::operator()(Assignment& _assignment)
+{
+	for (auto& name: _assignment.variableNames)
+		(*this)(name);
+	visit(*_assignment.value);
+}
+
+void ASTModifier::operator()(VariableDeclaration& _varDecl)
+{
+	if (_varDecl.value)
+		visit(*_varDecl.value);
+}
+
+void ASTModifier::operator()(If& _if)
+{
+	visit(*_if.condition);
+	(*this)(_if.body);
+}
+
+void ASTModifier::operator()(Switch& _switch)
+{
+	visit(*_switch.expression);
+	for (auto& _case: _switch.cases)
+	{
+		if (_case.value)
+			(*this)(*_case.value);
+		(*this)(_case.body);
+	}
+}
+
+void ASTModifier::operator()(FunctionDefinition& _fun)
+{
+	(*this)(_fun.body);
+}
+
+void ASTModifier::operator()(ForLoop& _for)
+{
+	(*this)(_for.pre);
+	visit(*_for.condition);
+	(*this)(_for.post);
+	(*this)(_for.body);
+}
+
+void ASTModifier::operator()(Block& _block)
+{
+	walkVector(_block.statements);
+}