Swift: Add upgrade and downgrade scripts

Author: jketema

swift/downgrades/b7006eaacb007a06251596835506185619b86e98/availability_specs.ql

@@ -0,0 +1,16 @@
+class AvailabilitySpec extends @availability_spec {
+  string toString() { none() }
+}
+
+query predicate new_other_availability_specs(AvailabilitySpec id) {
+  availability_specs(id) and
+  availability_spec_is_wildcard(id)
+}
+
+query predicate new_platform_version_availability_specs(
+  AvailabilitySpec id, string platform, string version
+) {
+  availability_specs(id) and
+  availability_spec_platforms(id, platform) and
+  availability_spec_versions(id, version)
+}

swift/downgrades/b7006eaacb007a06251596835506185619b86e98/key_path_components.ql

@@ -0,0 +1,57 @@
+class KeyPathComponent extends @key_path_component {
+  string toString() { none() }
+}
+
+class Element extends @element {
+  string toString() { none() }
+}
+
+class ArgumentOrNone extends @argument_or_none {
+  string toString() { none() }
+}
+
+class TypeOrNone extends @type_or_none {
+  string toString() { none() }
+}
+
+class ValueDeclOrNone extends @value_decl_or_none {
+  string toString() { none() }
+}
+
+predicate isKeyPathComponentWithNewKind(KeyPathComponent id) {
+  key_path_components(id, 3, _) or key_path_components(id, 4, _)
+}
+
+query predicate new_key_path_components(KeyPathComponent id, int kind, TypeOrNone component_type) {
+  exists(int old_kind |
+    key_path_components(id, old_kind, component_type) and
+    not isKeyPathComponentWithNewKind(id) and
+    if old_kind < 5 then kind = old_kind else kind = old_kind - 2
+  )
+}
+
+query predicate new_key_path_component_subscript_arguments(
+  KeyPathComponent id, int index, ArgumentOrNone subscript_argument
+) {
+  key_path_component_subscript_arguments(id, index, subscript_argument) and
+  not isKeyPathComponentWithNewKind(id)
+}
+
+query predicate new_key_path_component_tuple_indices(KeyPathComponent id, int tuple_index) {
+  key_path_component_tuple_indices(id, tuple_index) and
+  not isKeyPathComponentWithNewKind(id)
+}
+
+query predicate new_key_path_component_decl_refs(KeyPathComponent id, ValueDeclOrNone decl_ref) {
+  key_path_component_decl_refs(id, decl_ref) and
+  not isKeyPathComponentWithNewKind(id)
+}
+
+query predicate new_unspecified_elements(Element id, string property, string error) {
+  unspecified_elements(id, property, error)
+  or
+  isKeyPathComponentWithNewKind(id) and
+  property = "" and
+  error =
+    "UnresolvedApply and Apply KeyPathComponents removed during database downgrade. Please update your CodeQL."
+}