1 files changed, 75 insertions, 0 deletions
diff --git a/libyul/optimiser/Disambiguator.cpp b/libyul/optimiser/Disambiguator.cpp
new file mode 100644
index 00000000..af3507e1
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+++ b/libyul/optimiser/Disambiguator.cpp
@@ -0,0 +1,75 @@
+/*
+	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/>.
+*/
+/**
+ * Optimiser component that makes all identifiers unique.
+ */
+
+#include <libyul/optimiser/Disambiguator.h>
+
+#include <libyul/Exceptions.h>
+
+#include <libsolidity/inlineasm/AsmData.h>
+#include <libsolidity/inlineasm/AsmScope.h>
+
+using namespace std;
+using namespace dev;
+using namespace dev::yul;
+using namespace dev::solidity;
+
+using Scope = dev::solidity::assembly::Scope;
+
+string Disambiguator::translateIdentifier(string const& _originalName)
+{
+	assertThrow(!m_scopes.empty() && m_scopes.back(), OptimizerException, "");
+	Scope::Identifier const* id = m_scopes.back()->lookup(_originalName);
+	assertThrow(id, OptimizerException, "");
+	if (!m_translations.count(id))
+		m_translations[id] = m_nameDispenser.newName(_originalName);
+	return m_translations.at(id);
+}
+
+void Disambiguator::enterScope(Block const& _block)
+{
+	enterScopeInternal(*m_info.scopes.at(&_block));
+}
+
+void Disambiguator::leaveScope(Block const& _block)
+{
+	leaveScopeInternal(*m_info.scopes.at(&_block));
+}
+
+void Disambiguator::enterFunction(FunctionDefinition const& _function)
+{
+	enterScopeInternal(*m_info.scopes.at(m_info.virtualBlocks.at(&_function).get()));
+}
+
+void Disambiguator::leaveFunction(FunctionDefinition const& _function)
+{
+	leaveScopeInternal(*m_info.scopes.at(m_info.virtualBlocks.at(&_function).get()));
+}
+
+void Disambiguator::enterScopeInternal(Scope& _scope)
+{
+	m_scopes.push_back(&_scope);
+}
+
+void Disambiguator::leaveScopeInternal(Scope& _scope)
+{
+	assertThrow(!m_scopes.empty(), OptimizerException, "");
+	assertThrow(m_scopes.back() == &_scope, OptimizerException, "");
+	m_scopes.pop_back();
+}