Revert statement.

libsolidity/ast/AST.h

@@ -1726,6 +1726,31 @@ public:
 	void accept(ASTConstVisitor& _visitor) const override;
 };
 
+/**
+ * The revert statement is used to revert state changes and return error data.
+ */
+class RevertStatement: public Statement
+{
+public:
+	explicit RevertStatement(
+		int64_t _id,
+		SourceLocation const& _location,
+		ASTPointer<ASTString> const& _docString,
+		ASTPointer<FunctionCall> _functionCall
+	):
+		Statement(_id, _location, _docString), m_errorCall(std::move(_functionCall))
+	{
+		solAssert(m_errorCall, "");
+	}
+	void accept(ASTVisitor& _visitor) override;
+	void accept(ASTConstVisitor& _visitor) const override;
+
+	FunctionCall const& errorCall() const { return *m_errorCall; }
+
+private:
+	ASTPointer<FunctionCall> m_errorCall;
+};
+
 /**
  * The emit statement is used to emit events: emit EventName(arg1, ..., argn)
  */