+
+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(MemberAccess &memacc)
+{
+ if(memacc.left->type && !memacc.declaration)
+ error(memacc, format("Use of undeclared member '%s'", memacc.member));
+ TraversingVisitor::visit(memacc);
+}
+
+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(FunctionCall &call)
+{
+ if(!call.declaration && !call.constructor)
+ error(call, format("Call to undeclared function '%s'", call.name));
+ TraversingVisitor::visit(call);
+}
+
+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(InterfaceBlock &iface)
+{
+ if(!iface.struct_declaration)
+ error(iface, format("Interface block '%s %s' lacks a struct declaration", iface.interface, iface.name));
+ TraversingVisitor::visit(iface);
+}
+
+void ReferenceValidator::visit(FunctionDeclaration &func)
+{
+ if(!func.return_type_declaration)
+ error(func, format("Use of undeclared type '%s'", func.return_type));
+ TraversingVisitor::visit(func);
+}
+
+
+void ExpressionValidator::visit(Swizzle &swizzle)
+{
+ unsigned size = 0;
+ if(BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(swizzle.left->type))
+ {
+ if(basic->kind==BasicTypeDeclaration::INT || basic->kind==BasicTypeDeclaration::FLOAT)
+ size = 1;
+ else if(basic->kind==BasicTypeDeclaration::VECTOR)
+ size = basic->size;
+ }
+
+ if(size)
+ {
+ static const char component_names[] = { 'x', 'y', 'z', 'w', 'r', 'g', 'b', 'a', 's', 't', 'p', 'q' };
+ int flavour = -1;
+ for(unsigned i=0; i<swizzle.count; ++i)
+ {
+ unsigned component_flavour = (find(component_names, component_names+12, swizzle.component_group[i])-component_names)/4;
+ if(flavour==-1)
+ flavour = component_flavour;
+ else if(flavour>=0 && component_flavour!=static_cast<unsigned>(flavour))
+ {
+ error(swizzle, format("Flavour of swizzle component '%c' is inconsistent with '%c'",
+ swizzle.component_group[i], swizzle.component_group[0]));
+ flavour = -2;
+ }
+
+ if(swizzle.components[i]>=size)
+ error(swizzle, format("Access to component '%c' which is not present in '%s'",
+ swizzle.component_group[i], swizzle.left->type->name));
+ }
+ }
+ else if(swizzle.left->type)
+ error(swizzle, format("Swizzle applied to '%s' which is neither a scalar nor a vector", swizzle.left->type->name));
+
+ TraversingVisitor::visit(swizzle);
+}
+
+void ExpressionValidator::visit(UnaryExpression &unary)
+{
+ if(unary.expression->type)
+ {
+ if(!unary.type)
+ error(unary, format("No matching operator '%s' found for '%s'", unary.oper->token, unary.expression->type->name));
+ else if((unary.oper->token[1]=='+' || unary.oper->token[1]=='-') && !unary.expression->lvalue)
+ error(unary, format("Operand of '%s' is not an lvalue", unary.oper->token));
+ }
+ TraversingVisitor::visit(unary);
+}
+
+void ExpressionValidator::visit(BinaryExpression &binary)
+{
+ if(!binary.type && binary.left->type && binary.right->type)
+ error(binary, format("No matching operator '%s' found for '%s' and '%s'",
+ binary.oper->token, binary.left->type->name, binary.right->type->name));
+ TraversingVisitor::visit(binary);
+}
+
+void ExpressionValidator::visit(Assignment &assign)
+{
+ if(assign.left->type)
+ {
+ if(!assign.left->lvalue)
+ error(assign, "Target of assignment is not an lvalue");
+ if(assign.right->type)
+ {
+ if(assign.oper->token[0]!='=')
+ {
+ if(!assign.type)
+ error(assign, format("No matching operator '%s' found for '%s' and '%s'",
+ string(assign.oper->token, strlen(assign.oper->token)-1), assign.left->type->name, assign.right->type->name));
+ }
+ else if(assign.left->type!=assign.right->type)
+ error(assign, format("Assignment to variable of type '%s' from expression of incompatible type '%s'",
+ assign.left->type->name, assign.right->type->name));
+ }
+ }
+ TraversingVisitor::visit(assign);
+}
+
+void ExpressionValidator::visit(VariableDeclaration &var)
+{
+ if(var.init_expression && var.init_expression->type && var.type_declaration && var.init_expression->type!=var.type_declaration)
+ error(var, format("Initializing a variable of type '%s' with an expression of incompatible type '%s'",
+ var.type_declaration->name, var.init_expression->type->name));
+ TraversingVisitor::visit(var);
+}
+