Performance: Replace string by special single-copy YulString class.

1 files changed, 8 insertions, 9 deletions

diff --git a/libyul/optimiser/NameCollector.h b/libyul/optimiser/NameCollector.h
index b8f6c1d7..b76eec30 100644
--- a/libyul/optimiser/NameCollector.h
+++ b/libyul/optimiser/NameCollector.h
@@ -22,7 +22,6 @@
 
 #include <libyul/optimiser/ASTWalker.h>
 
-#include <string>
 #include <map>
 #include <set>
 
@@ -46,9 +45,9 @@ public:
 	virtual void operator()(VariableDeclaration const& _varDecl) override;
 	virtual void operator()(FunctionDefinition const& _funDef) override;
 
-	std::set<std::string> names() const { return m_names; }
+	std::set<YulString> names() const { return m_names; }
 private:
-	std::set<std::string> m_names;
+	std::set<YulString> m_names;
 };
 
 /**
@@ -61,12 +60,12 @@ public:
 	virtual void operator()(Identifier const& _identifier);
 	virtual void operator()(FunctionCall const& _funCall);
 
-	static std::map<std::string, size_t> countReferences(Block const& _block);
-	static std::map<std::string, size_t> countReferences(Expression const& _expression);
+	static std::map<YulString, size_t> countReferences(Block const& _block);
+	static std::map<YulString, size_t> countReferences(Expression const& _expression);
 
-	std::map<std::string, size_t> const& references() const { return m_references; }
+	std::map<YulString, size_t> const& references() const { return m_references; }
 private:
-	std::map<std::string, size_t> m_references;
+	std::map<YulString, size_t> m_references;
 };
 
 /**
@@ -78,9 +77,9 @@ public:
 	using ASTWalker::operator ();
 	virtual void operator()(Assignment const& _assignment) override;
 
-	std::set<std::string> const& names() const { return m_names; }
+	std::set<YulString> const& names() const { return m_names; }
 private:
-	std::set<std::string> m_names;
+	std::set<YulString> m_names;
 };
 
 }