Swift: implement optional ImportDecl:imported_module

Author: redsun82

swift/extractor/visitors/DeclVisitor.cpp

@@ -253,7 +253,7 @@ codeql::ExtensionDecl DeclVisitor::translateExtensionDecl(const swift::Extension
 codeql::ImportDecl DeclVisitor::translateImportDecl(const swift::ImportDecl& decl) {
   auto entry = createEntry(decl);
   entry.is_exported = decl.isExported();
-  entry.imported_module = dispatcher_.fetchLabel(decl.getModule());
+  entry.imported_module = dispatcher_.fetchOptionalLabel(decl.getModule());
   entry.declarations = dispatcher_.fetchRepeatedLabels(decl.getDecls());
   return entry;
 }

swift/ql/test/extractor-tests/generated/decl/ImportDecl/ImportDecl.expected

@@ -1,5 +1,6 @@
-| import.swift:1:1:1:8 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no | getImportedModule: | file://:0:0:0:0 | Swift |
-| import.swift:2:1:2:24 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no | getImportedModule: | file://:0:0:0:0 | Swift |
-| import.swift:3:12:3:32 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | yes | getImportedModule: | file://:0:0:0:0 | Swift |
-| import.swift:4:1:4:19 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no | getImportedModule: | file://:0:0:0:0 | Swift |
-| import.swift:5:1:5:23 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no | getImportedModule: | file://:0:0:0:0 | Swift |
+| import.swift:1:1:1:8 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no |
+| import.swift:2:1:2:24 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no |
+| import.swift:3:12:3:32 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | yes |
+| import.swift:4:1:4:19 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no |
+| import.swift:5:1:5:23 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no |
+| import.swift:7:1:7:8 | import ... | getModule: | file://:0:0:0:0 | import | isExported: | no |

swift/ql/test/extractor-tests/generated/decl/ImportDecl/ImportDecl_getImportedModule.expected

@@ -0,0 +1,5 @@
+| import.swift:1:1:1:8 | import ... | file://:0:0:0:0 | Swift |
+| import.swift:2:1:2:24 | import ... | file://:0:0:0:0 | Swift |
+| import.swift:3:12:3:32 | import ... | file://:0:0:0:0 | Swift |
+| import.swift:4:1:4:19 | import ... | file://:0:0:0:0 | Swift |
+| import.swift:5:1:5:23 | import ... | file://:0:0:0:0 | Swift |

swift/ql/test/extractor-tests/generated/decl/ImportDecl/import.swift

@@ -3,3 +3,6 @@ import typealias Swift.Int
 @_exported import struct Swift.Double
 import func Swift.print  // imports all overloads
 import protocol Swift.Hashable
+#if foo
+import Foo
+#endif