[ASTGen] Disable ExportedSourceFile for macro expanded buffers

Author: rintaro

lib/Parse/ParseDecl.cpp

@@ -330,6 +330,20 @@ void Parser::parseSourceFileViaASTGen(
   if (!needToParse)
     return;
 
+  switch (SF.Kind) {
+  case SourceFileKind::Library:
+  case SourceFileKind::Main:
+  case SourceFileKind::Interface:
+    break;
+  case SourceFileKind::SIL:
+    // FIXME: Support SIL.
+    return;
+  case SourceFileKind::MacroExpansion:
+  case SourceFileKind::DefaultArgument:
+    // FIXME: Support macro expanded sources.
+    return;
+  }
+
   auto *exportedSourceFile = SF.getExportedSourceFile();
   if (!exportedSourceFile)
     return;

test/ASTGen/macros.swift

@@ -0,0 +1,18 @@
+// REQUIRES: swift_swift_parser, asserts
+
+// RUN: %empty-directory(%t)
+
+// RUN: %host-build-swift -swift-version 5 -emit-library -o %t/%target-library-name(MacroDefinition) -module-name=MacroDefinition %S/../Macros/Inputs/syntax_macro_definitions.swift
+
+// RUN: %target-typecheck-verify-swift -swift-version 5 -load-plugin-library %t/%target-library-name(MacroDefinition) -module-name MacroUser -enable-experimental-feature ParserASTGen
+
+@freestanding(declaration) macro anonymousTypes(_: () -> String) = #externalMacro(module: "MacroDefinition", type: "DefineAnonymousTypesMacro")
+@freestanding(expression) macro stringify<T>(_ value: T) -> (T, String) = #externalMacro(module: "MacroDefinition", type: "StringifyMacro")
+
+func foo(a: Int) {
+  _ = #stringify(a + 1)
+}
+
+struct Outer {
+  #anonymousTypes { "test" }
+}