Merge pull request #42170 from rxwei/disable-string-processing-import-flag

Add frontend flag `-disable-implicit-string-processing-module-import`.

Author: rxwei

SwiftCompilerSources/Package.swift

@@ -28,9 +28,16 @@ let package = Package(
     .target(
       name: "_RegexParser",
       dependencies: [],
-      swiftSettings: [SwiftSetting.unsafeFlags([
+      swiftSettings: [
+        .unsafeFlags([
           "-I", "../include/swift",
-          "-cross-module-optimization"
+          "-cross-module-optimization",
+        ]),
+        // Workaround until `_RegexParser` is imported as implementation-only
+        // by `_StringProcessing`.
+        .unsafeFlags([
+          "-Xfrontend",
+          "-disable-implicit-string-processing-module-import"
         ])]),
     .target(
       name: "Optimizer",

include/swift/Basic/LangOptions.h

@@ -363,6 +363,9 @@ namespace swift {
     bool DisableImplicitConcurrencyModuleImport =
         !SWIFT_IMPLICIT_CONCURRENCY_IMPORT;
 
+    /// Disable the implicit import of the _StringProcessing module.
+    bool DisableImplicitStringProcessingModuleImport = false;
+
     /// Should we check the target OSs of serialized modules to see that they're
     /// new enough?
     bool EnableTargetOSChecking = true;

include/swift/Option/FrontendOptions.td

@@ -422,6 +422,10 @@ def disable_implicit_distributed_module_import : Flag<["-"],
   "disable-implicit-distributed-module-import">,
   HelpText<"Disable the implicit import of the Distributed module.">;
 
+def disable_implicit_string_processing_module_import : Flag<["-"],
+  "disable-implicit-string-processing-module-import">,
+  HelpText<"Disable the implicit import of the _StringProcessing module.">;
+
 def disable_arc_opts : Flag<["-"], "disable-arc-opts">,
   HelpText<"Don't run SIL ARC optimization passes.">;
 def disable_ossa_opts : Flag<["-"], "disable-ossa-opts">,

lib/Frontend/CompilerInvocation.cpp

@@ -485,6 +485,9 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
   Opts.DisableImplicitConcurrencyModuleImport |=
     Args.hasArg(OPT_disable_implicit_concurrency_module_import);
 
+  Opts.DisableImplicitStringProcessingModuleImport |=
+    Args.hasArg(OPT_disable_implicit_string_processing_module_import);
+
   if (Args.hasArg(OPT_enable_experimental_async_top_level))
     Diags.diagnose(SourceLoc(), diag::warn_flag_deprecated,
                    "-enable-experimental-async-top-level");

lib/Frontend/Frontend.cpp

@@ -793,7 +793,8 @@ bool CompilerInvocation::shouldImportSwiftConcurrency() const {
 }
 
 bool CompilerInvocation::shouldImportSwiftStringProcessing() const {
-  return getLangOptions().EnableExperimentalStringProcessing;
+  return getLangOptions().EnableExperimentalStringProcessing &&
+      !getLangOptions().DisableImplicitStringProcessingModuleImport;
 }
 
 /// Implicitly import the SwiftOnoneSupport module in non-optimized

stdlib/public/RegexParser/CMakeLists.txt

@@ -38,6 +38,9 @@ add_swift_target_library(swift_RegexParser ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} I
     -Dswift_RegexParser_EXPORTS
   SWIFT_COMPILE_FLAGS
     ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
+    # Workaround until `_RegexParser` is imported as implementation-only
+    # by `_StringProcessing`.
+    -Xfrontend -disable-implicit-string-processing-module-import
   LINK_FLAGS "${SWIFT_RUNTIME_SWIFT_LINK_FLAGS}"
 
   INSTALL_IN_COMPONENT stdlib

test/StringProcessing/Sema/string_processing_import.swift

@@ -0,0 +1,7 @@
+// RUN: %target-typecheck-verify-swift -enable-experimental-string-processing -disable-implicit-string-processing-module-import
+// REQUIRES: swift_in_compiler
+
+// expected-error @+1 {{missing 'Regex' declaration, probably because the '_StringProcessing' module was not imported properly}}
+let r0 = #/./#
+// expected-error @+1 {{cannot find type 'Regex' in scope}}
+let _: Regex<Substring> = r0

tools/SourceKit/tools/complete-test/complete-test.cpp

@@ -69,6 +69,7 @@ struct TestOptions {
   bool rawOutput = false;
   bool structureOutput = false;
   bool disableImplicitConcurrencyModuleImport = false;
+  bool disableImplicitStringProcessingModuleImport = false;
   ArrayRef<const char *> compilerArgs;
 };
 } // end anonymous namespace
@@ -257,6 +258,8 @@ static bool parseOptions(ArrayRef<const char *> args, TestOptions &options,
       options.moduleCachePath = value.str();
     } else if (opt == "disable-implicit-concurrency-module-import") {
       options.disableImplicitConcurrencyModuleImport = true;
+    } else if (opt == "disable-implicit-string-processing-module-import") {
+      options.disableImplicitStringProcessingModuleImport = true;
     }
   }
 
@@ -693,6 +696,12 @@ static bool codeCompleteRequest(sourcekitd_uid_t requestUID, const char *name,
       sourcekitd_request_array_set_string(args, SOURCEKITD_ARRAY_APPEND,
           "-disable-implicit-concurrency-module-import");
     }
+    if (options.disableImplicitStringProcessingModuleImport) {
+      sourcekitd_request_array_set_string(args, SOURCEKITD_ARRAY_APPEND,
+          "-Xfrontend");
+      sourcekitd_request_array_set_string(args, SOURCEKITD_ARRAY_APPEND,
+          "-disable-implicit-string-processing-module-import");
+    }
   }
   sourcekitd_request_dictionary_set_value(request, KeyCompilerArgs, args);
   sourcekitd_request_release(args);

tools/SourceKit/tools/sourcekitd-test/Options.td

@@ -109,6 +109,10 @@ def disable_implicit_concurrency_module_import : Flag<["-"],
     "disable-implicit-concurrency-module-import">,
   HelpText<"Disable implicit import of the _Concurrency module">;
 
+def disable_implicit_string_processing_module_import : Flag<["-"],
+    "disable-implicit-string-processing-module-import">,
+  HelpText<"Disable implicit import of the _StringProcessing module">;
+
 def end_pos : Separate<["-"], "end-pos">, HelpText<"line:col">;
 def end_pos_EQ : Joined<["-"], "end-pos=">, Alias<end_pos>;
 

tools/SourceKit/tools/sourcekitd-test/TestOptions.cpp

@@ -444,6 +444,10 @@ bool TestOptions::parseArgs(llvm::ArrayRef<const char *> Args) {
       DisableImplicitConcurrencyModuleImport = true;
       break;
 
+    case OPT_disable_implicit_string_processing_module_import:
+      DisableImplicitStringProcessingModuleImport = true;
+      break;
+
     case OPT_UNKNOWN:
       llvm::errs() << "error: unknown argument: "
                    << InputArg->getAsString(ParsedArgs) << '\n'