[Dependency Scanning] Keep track of each imported module's access control

include/swift-c/DependencyScan/DependencyScan.h

@@ -25,7 +25,7 @@
 /// SWIFTSCAN_VERSION_MINOR should increase when there are API additions.
 /// SWIFTSCAN_VERSION_MAJOR is intended for "major" source/ABI breaking changes.
 #define SWIFTSCAN_VERSION_MAJOR 2
-#define SWIFTSCAN_VERSION_MINOR 1
+#define SWIFTSCAN_VERSION_MINOR 2
 
 SWIFTSCAN_BEGIN_DECLS
 
@@ -49,6 +49,9 @@ typedef struct swiftscan_dependency_info_s *swiftscan_dependency_info_t;
 /// Opaque container to a link library info.
 typedef struct swiftscan_link_library_info_s *swiftscan_link_library_info_t;
 
+/// Opaque container to an import info.
+typedef struct swiftscan_import_info_s *swiftscan_import_info_t;
+
 /// Opaque container to a macro dependency.
 typedef struct swiftscan_macro_dependency_s *swiftscan_macro_dependency_t;
 
@@ -76,6 +79,18 @@ typedef struct {
   size_t count;
 } swiftscan_link_library_set_t;
 
+/// Set of details about source imports
+typedef struct {
+  swiftscan_import_info_t *imports;
+  size_t count;
+} swiftscan_import_info_set_t;
+
+/// Set of source location infos
+typedef struct {
+  swiftscan_source_location_t *source_locations;
+  size_t count;
+} swiftscan_source_location_set_t;
+
 /// Set of macro dependency
 typedef struct {
   swiftscan_macro_dependency_t *macro_dependencies;
@@ -89,6 +104,15 @@ typedef enum {
   SWIFTSCAN_DIAGNOSTIC_SEVERITY_REMARK = 3
 } swiftscan_diagnostic_severity_t;
 
+// Must maintain consistency with swift::AccessLevel
+typedef enum {
+  SWIFTSCAN_ACCESS_LEVEL_PRIVATE = 0,
+  SWIFTSCAN_ACCESS_LEVEL_FILEPRIVATE = 1,
+  SWIFTSCAN_ACCESS_LEVEL_INTERNAL = 2,
+  SWIFTSCAN_ACCESS_LEVEL_PACKAGE = 3,
+  SWIFTSCAN_ACCESS_LEVEL_PUBLIC = 4
+} swiftscan_access_level_t;
+
 typedef struct {
   swiftscan_diagnostic_info_t *diagnostics;
   size_t count;
@@ -148,10 +172,23 @@ swiftscan_module_info_get_direct_dependencies(swiftscan_dependency_info_t info);
 SWIFTSCAN_PUBLIC swiftscan_link_library_set_t *
 swiftscan_module_info_get_link_libraries(swiftscan_dependency_info_t info);
 
+SWIFTSCAN_PUBLIC swiftscan_import_info_set_t *
+swiftscan_module_info_get_imports(swiftscan_dependency_info_t info);
+
 SWIFTSCAN_PUBLIC swiftscan_module_details_t
 swiftscan_module_info_get_details(swiftscan_dependency_info_t info);
 
-//=== Link Library Info Functions ------------------------------------===//
+//=== Import Details Functions -------------------------------------------===//
+SWIFTSCAN_PUBLIC swiftscan_source_location_set_t *
+swiftscan_import_info_get_source_locations(swiftscan_import_info_t info);
+
+SWIFTSCAN_PUBLIC swiftscan_string_ref_t
+swiftscan_import_info_get_identifier(swiftscan_import_info_t info);
+
+SWIFTSCAN_PUBLIC swiftscan_access_level_t
+swiftscan_import_info_get_access_level(swiftscan_import_info_t info);
+
+//=== Link Library Info Functions ----------------------------------------===//
 SWIFTSCAN_PUBLIC swiftscan_string_ref_t
 swiftscan_link_library_info_get_link_name(
     swiftscan_link_library_info_t info);

include/swift/AST/ModuleDependencies.h

@@ -156,30 +156,35 @@ struct ScannerImportStatementInfo {
     uint32_t columnNumber;
   };
 
-  ScannerImportStatementInfo(std::string importIdentifier, bool isExported)
-      : importLocations(), importIdentifier(importIdentifier),
-        isExported(isExported) {}
+  ScannerImportStatementInfo(std::string importIdentifier, bool isExported,
+                             AccessLevel accessLevel)
+      : importIdentifier(importIdentifier), importLocations(),
+        isExported(isExported), accessLevel(accessLevel) {}
 
   ScannerImportStatementInfo(std::string importIdentifier, bool isExported,
+                             AccessLevel accessLevel,
                              ImportDiagnosticLocationInfo location)
-      : importLocations({location}), importIdentifier(importIdentifier),
-        isExported(isExported) {}
+      : importIdentifier(importIdentifier), importLocations({location}),
+        isExported(isExported), accessLevel(accessLevel) {}
 
   ScannerImportStatementInfo(std::string importIdentifier, bool isExported,
+                             AccessLevel accessLevel,
                              SmallVector<ImportDiagnosticLocationInfo, 4> locations)
-      : importLocations(locations), importIdentifier(importIdentifier),
-        isExported(isExported) {}
+      : importIdentifier(importIdentifier), importLocations(locations),
+        isExported(isExported), accessLevel(accessLevel) {}
 
   void addImportLocation(ImportDiagnosticLocationInfo location) {
     importLocations.push_back(location);
   }
 
-  /// Buffer, line & column number of the import statement
-  SmallVector<ImportDiagnosticLocationInfo, 4> importLocations;
   /// Imported module string. e.g. "Foo.Bar" in 'import Foo.Bar'
   std::string importIdentifier;
+  /// Buffer, line & column number of the import statement
+  SmallVector<ImportDiagnosticLocationInfo, 4> importLocations;
   /// Is this an @_exported import
   bool isExported;
+  /// Access level of this dependency
+  AccessLevel accessLevel;
 };
 
 /// Base class for the variant storage of ModuleDependencyInfo.
@@ -942,6 +947,7 @@ class ModuleDependencyInfo {
   /// Add a dependency on the given module, if it was not already in the set.
   void
   addOptionalModuleImport(StringRef module, bool isExported,
+                          AccessLevel accessLevel,
                           llvm::StringSet<> *alreadyAddedModules = nullptr);
 
   /// Add all of the module imports in the given source
@@ -952,12 +958,14 @@ class ModuleDependencyInfo {
 
   /// Add a dependency on the given module, if it was not already in the set.
   void addModuleImport(ImportPath::Module module, bool isExported,
+                       AccessLevel accessLevel,
                        llvm::StringSet<> *alreadyAddedModules = nullptr,
                        const SourceManager *sourceManager = nullptr,
                        SourceLoc sourceLocation = SourceLoc());
 
   /// Add a dependency on the given module, if it was not already in the set.
   void addModuleImport(StringRef module, bool isExported,
+                       AccessLevel accessLevel,
                        llvm::StringSet<> *alreadyAddedModules = nullptr,
                        const SourceManager *sourceManager = nullptr,
                        SourceLoc sourceLocation = SourceLoc());

include/swift/DependencyScan/DependencyScanImpl.h

@@ -63,6 +63,9 @@ struct swiftscan_dependency_info_s {
   /// The list of link libraries for this module.
   swiftscan_link_library_set_t *link_libraries;
 
+  /// The list of source import infos.
+  swiftscan_import_info_set_t *imports;
+
   /// Specific details of a particular kind of module.
   swiftscan_module_details_t details;
 };
@@ -74,10 +77,16 @@ struct swiftscan_link_library_info_s {
   bool forceLoad;
 };
 
+struct swiftscan_import_info_s {
+  swiftscan_string_ref_t import_identifier;
+  swiftscan_source_location_set_t *source_locations;
+  swiftscan_access_level_t access_level;
+};
+
 struct swiftscan_macro_dependency_s {
-  swiftscan_string_ref_t moduleName;
-  swiftscan_string_ref_t libraryPath;
-  swiftscan_string_ref_t executablePath;
+  swiftscan_string_ref_t module_name;
+  swiftscan_string_ref_t library_path;
+  swiftscan_string_ref_t executable_path;
 };
 
 /// Swift modules to be built from a module interface, may have a bridging

include/swift/DependencyScan/SerializedModuleDependencyCacheFormat.h

@@ -67,6 +67,9 @@ using IsExportedImport = BCFixed<1>;
 using LineNumberField = BCFixed<32>;
 using ColumnNumberField = BCFixed<32>;
 
+/// Access level of an import
+using AccessLevelField = BCFixed<8>;
+
 /// Arrays of various identifiers, distinguished for readability
 using IdentifierIDArryField = llvm::BCArray<IdentifierIDField>;
 using ModuleIDArryField = llvm::BCArray<IdentifierIDField>;
@@ -192,7 +195,8 @@ using ImportStatementLayout =
                    LineNumberField,              // lineNumber
                    ColumnNumberField,            // columnNumber
                    IsOptionalImport,             // isOptional
-                   IsExportedImport              // isExported
+                   IsExportedImport,             // isExported
+                   AccessLevelField              // accessLevel
                    >;
 using ImportStatementArrayLayout =
     BCRecordLayout<IMPORT_STATEMENT_ARRAY_NODE, IdentifierIDArryField>;

include/swift/Serialization/SerializedModuleLoader.h

@@ -170,8 +170,7 @@ class SerializedModuleLoaderBase : public ModuleLoader {
                  bool isTestableImport, bool isCandidateForTextualModule);
 
   struct BinaryModuleImports {
-    llvm::StringSet<> moduleImports;
-    llvm::StringSet<> exportedModules;
+    std::vector<ScannerImportStatementInfo> moduleImports;
     std::string headerImport;
   };
 

lib/AST/ModuleDependencies.cpp

@@ -116,14 +116,34 @@ bool ModuleDependencyInfo::isTestableImport(StringRef moduleName) const {
 }
 
 void ModuleDependencyInfo::addOptionalModuleImport(
-    StringRef module, bool isExported, llvm::StringSet<> *alreadyAddedModules) {
-  if (!alreadyAddedModules || alreadyAddedModules->insert(module).second)
-    storage->optionalModuleImports.push_back({module.str(), isExported});
+    StringRef module, bool isExported, AccessLevel accessLevel,
+    llvm::StringSet<> *alreadyAddedModules) {
+
+  if (alreadyAddedModules && alreadyAddedModules->contains(module)) {
+    // Find a prior import of this module and add import location
+    // and adjust whether or not this module is ever imported as exported
+    // as well as the access level
+    for (auto &existingImport : storage->optionalModuleImports) {
+      if (existingImport.importIdentifier == module) {
+        existingImport.isExported |= isExported;
+        existingImport.accessLevel = std::max(existingImport.accessLevel,
+                                              accessLevel);
+        break;
+      }
+    }
+  } else {
+    if (alreadyAddedModules)
+      alreadyAddedModules->insert(module);
+
+    storage->optionalModuleImports.push_back(
+         {module.str(), isExported, accessLevel});
+  }
 }
 
 void ModuleDependencyInfo::addModuleImport(
-    StringRef module, bool isExported, llvm::StringSet<> *alreadyAddedModules,
-    const SourceManager *sourceManager, SourceLoc sourceLocation) {
+    StringRef module, bool isExported, AccessLevel accessLevel,
+    llvm::StringSet<> *alreadyAddedModules, const SourceManager *sourceManager,
+    SourceLoc sourceLocation) {
   auto scannerImportLocToDiagnosticLocInfo =
       [&sourceManager](SourceLoc sourceLocation) {
         auto lineAndColumnNumbers =
@@ -138,13 +158,16 @@ void ModuleDependencyInfo::addModuleImport(
   if (alreadyAddedModules && alreadyAddedModules->contains(module)) {
     // Find a prior import of this module and add import location
     // and adjust whether or not this module is ever imported as exported
+    // as well as the access level
     for (auto &existingImport : storage->moduleImports) {
       if (existingImport.importIdentifier == module) {
         if (validSourceLocation) {
           existingImport.addImportLocation(
-            scannerImportLocToDiagnosticLocInfo(sourceLocation));
+              scannerImportLocToDiagnosticLocInfo(sourceLocation));
         }
         existingImport.isExported |= isExported;
+        existingImport.accessLevel = std::max(existingImport.accessLevel,
+                                              accessLevel);
         break;
       }
     }
@@ -154,16 +177,18 @@ void ModuleDependencyInfo::addModuleImport(
 
     if (validSourceLocation)
       storage->moduleImports.push_back(ScannerImportStatementInfo(
-          module.str(), isExported, scannerImportLocToDiagnosticLocInfo(sourceLocation)));
+          module.str(), isExported, accessLevel,
+          scannerImportLocToDiagnosticLocInfo(sourceLocation)));
     else
       storage->moduleImports.push_back(
-         ScannerImportStatementInfo(module.str(), isExported));
+          ScannerImportStatementInfo(module.str(), isExported, accessLevel));
   }
 }
 
 void ModuleDependencyInfo::addModuleImport(
-    ImportPath::Module module, bool isExported, llvm::StringSet<> *alreadyAddedModules,
-    const SourceManager *sourceManager, SourceLoc sourceLocation) {
+    ImportPath::Module module, bool isExported, AccessLevel accessLevel,
+    llvm::StringSet<> *alreadyAddedModules, const SourceManager *sourceManager,
+    SourceLoc sourceLocation) {
   std::string ImportedModuleName = module.front().Item.str().str();
   auto submodulePath = module.getSubmodulePath();
   if (submodulePath.size() > 0 && !submodulePath[0].Item.empty()) {
@@ -172,11 +197,12 @@ void ModuleDependencyInfo::addModuleImport(
     // module named "Foo_Private". ClangImporter has special support for this.
     if (submoduleComponent.Item.str() == "Private")
       addOptionalModuleImport(ImportedModuleName + "_Private",
+                              isExported, accessLevel,
                               alreadyAddedModules);
   }
 
-  addModuleImport(ImportedModuleName, isExported, alreadyAddedModules,
-                  sourceManager, sourceLocation);
+  addModuleImport(ImportedModuleName, isExported, accessLevel,
+                  alreadyAddedModules, sourceManager, sourceLocation);
 }
 
 void ModuleDependencyInfo::addModuleImports(
@@ -205,6 +231,7 @@ void ModuleDependencyInfo::addModuleImports(
         continue;
 
       addModuleImport(realPath, importDecl->isExported(),
+                      importDecl->getAccessLevel(),
                       &alreadyAddedModules, sourceManager,
                       importDecl->getLoc());
 

lib/ClangImporter/ClangModuleDependencyScanner.cpp

@@ -191,7 +191,8 @@ ModuleDependencyVector ClangImporter::bridgeClangModuleDependencies(
       // FIXME: This assumes, conservatively, that all Clang module imports
       // are exported. We need to fix this once the clang scanner gains the appropriate
       // API to query this.
-      dependencies.addModuleImport(moduleName.ModuleName, /* isExported */ true, &alreadyAddedModules);
+      dependencies.addModuleImport(moduleName.ModuleName, /* isExported */ true,
+                                   AccessLevel::Public, &alreadyAddedModules);
       // It is safe to assume that all dependencies of a Clang module are Clang modules.
       directDependencyIDs.push_back({moduleName.ModuleName, ModuleDependencyKind::Clang});
     }