+
+void ReferenceValidator::visit(BasicTypeDeclaration &type)
+{
+ if(!type.base.empty() && !type.base_type)
+ error(type, format("Use of undeclared type '%s'", type.base));
+}
+
+void ReferenceValidator::visit(ImageTypeDeclaration &type)
+{
+ if(!type.base.empty() && !type.base_type)
+ error(type, format("Use of undeclared type '%s'", type.base));
+}
+
+void ReferenceValidator::visit(VariableReference &var)
+{
+ if(!var.declaration)
+ error(var, format("Use of undeclared variable '%s'", var.name));
+ else if(stage->type!=Stage::VERTEX && var.declaration->interface=="in" && !var.declaration->linked_declaration)
+ error(var, format("Use of unlinked input variable '%s'", var.name));
+}
+
+void ReferenceValidator::visit(InterfaceBlockReference &iface)
+{
+ /* An interface block reference without a declaration should be impossible
+ since references are generated based on existing declarations. */
+ if(!iface.declaration)
+ error(iface, format("Use of undeclared interface block '%s'", iface.name));
+ else if(stage->type!=Stage::VERTEX && iface.declaration->interface=="in" && !iface.declaration->linked_block)
+ error(iface, format("Use of unlinked input block '%s'", iface.name));
+}
+
+void ReferenceValidator::visit(VariableDeclaration &var)
+{
+ if(!var.type_declaration)
+ error(var, format("Use of undeclared type '%s'", var.type));
+ TraversingVisitor::visit(var);
+}
+
+void ReferenceValidator::visit(FunctionDeclaration &func)
+{
+ if(!func.return_type_declaration)
+ error(func, format("Use of undeclared type '%s'", func.return_type));
+ TraversingVisitor::visit(func);
+}
+