Support referencing other constants in inline assembly

libsolidity/ast/ASTUtils.cpp

@@ -0,0 +1,42 @@
+/*
+	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/>.
+*/
+
+#include <libsolidity/ast/AST.h>
+#include <libsolidity/ast/ASTUtils.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+VariableDeclaration const* rootVariableDeclaration(VariableDeclaration const& _varDecl)
+{
+	solAssert(_varDecl.isConstant(), "Constant variable expected");
+
+	VariableDeclaration const* rootDecl = &_varDecl;
+	Identifier const* identifier;
+	while ((identifier = dynamic_cast<Identifier const*>(rootDecl->value().get())))
+	{
+		auto referencedVarDecl = dynamic_cast<VariableDeclaration const*>(identifier->annotation().referencedDeclaration);
+		solAssert(referencedVarDecl && referencedVarDecl->isConstant(), "Identifier is not referencing a variable declaration");
+		rootDecl = referencedVarDecl;
+	}
+	return rootDecl;
+}
+
+}
+}