[Serialization] Remove treatAsPartialModule parameter

This information can be derived from whether we're
installing the module file into the main module.

include/swift/Serialization/SerializedModuleLoader.h

@@ -149,12 +149,13 @@ public:
   ///
   /// If the AST cannot be loaded and \p diagLoc is present, a diagnostic is
   /// printed. (Note that \p diagLoc is allowed to be invalid.)
-  FileUnit *loadAST(ModuleDecl &M, Optional<SourceLoc> diagLoc,
-                    StringRef moduleInterfacePath,
-                    std::unique_ptr<llvm::MemoryBuffer> moduleInputBuffer,
-                    std::unique_ptr<llvm::MemoryBuffer> moduleDocInputBuffer,
-                    std::unique_ptr<llvm::MemoryBuffer> moduleSourceInfoInputBuffer,
-                    bool isFramework, bool treatAsPartialModule);
+  FileUnit *
+  loadAST(ModuleDecl &M, Optional<SourceLoc> diagLoc,
+          StringRef moduleInterfacePath,
+          std::unique_ptr<llvm::MemoryBuffer> moduleInputBuffer,
+          std::unique_ptr<llvm::MemoryBuffer> moduleDocInputBuffer,
+          std::unique_ptr<llvm::MemoryBuffer> moduleSourceInfoInputBuffer,
+          bool isFramework);
 
   /// Check whether the module with a given name can be imported without
   /// importing it.

lib/Frontend/Frontend.cpp

@@ -839,8 +839,7 @@ bool CompilerInstance::loadPartialModulesAndImplicitImports() {
     assert(PM.ModuleBuffer);
     if (!SML->loadAST(*MainModule, SourceLoc(), /*moduleInterfacePath*/"",
                       std::move(PM.ModuleBuffer), std::move(PM.ModuleDocBuffer),
-                      std::move(PM.ModuleSourceInfoBuffer), /*isFramework*/false,
-                      /*treatAsPartialModule*/true))
+                      std::move(PM.ModuleSourceInfoBuffer), /*isFramework*/false))
       hadLoadError = true;
   }
   return hadLoadError;

lib/Serialization/ModuleFile.cpp

@@ -1977,9 +1977,7 @@ ModuleFile::ModuleFile(
   }
 }
 
-Status ModuleFile::associateWithFileContext(FileUnit *file,
-                                            SourceLoc diagLoc,
-                                            bool treatAsPartialModule) {
+Status ModuleFile::associateWithFileContext(FileUnit *file, SourceLoc diagLoc) {
   PrettyStackTraceModuleFile stackEntry(*this);
 
   assert(!hasError() && "error already detected; should not call this");
@@ -2033,8 +2031,12 @@ Status ModuleFile::associateWithFileContext(FileUnit *file,
       continue;
     }
 
+    // If this module file is being installed into the main module, it's treated
+    // as a partial module.
+    auto isPartialModule = M->isMainModule();
+
     if (dependency.isImplementationOnly() &&
-        !(treatAsPartialModule || ctx.LangOpts.DebuggerSupport)) {
+        !(isPartialModule || ctx.LangOpts.DebuggerSupport)) {
       // When building normally (and not merging partial modules), we don't
       // want to bring in the implementation-only module, because that might
       // change the set of visible declarations. However, when debugging we

lib/Serialization/ModuleFile.h

@@ -705,14 +705,10 @@ public:
   /// This does not include diagnostics about \e this file failing to load,
   /// but rather other things that might be imported as part of bringing the
   /// file into the AST.
-  /// \param treatAsPartialModule If true, processes implementation-only
-  /// information instead of assuming the client won't need it and shouldn't
-  /// see it.
   ///
   /// \returns any error that occurred during association, such as being
   /// compiled for a different OS.
-  Status associateWithFileContext(FileUnit *file, SourceLoc diagLoc,
-                                  bool treatAsPartialModule);
+  Status associateWithFileContext(FileUnit *file, SourceLoc diagLoc);
 
   /// Transfers ownership of a buffer that might contain source code where
   /// other parts of the compiler could have emitted diagnostics, to keep them

lib/Serialization/SerializedModuleLoader.cpp

@@ -651,7 +651,7 @@ FileUnit *SerializedModuleLoaderBase::loadAST(
     std::unique_ptr<llvm::MemoryBuffer> moduleInputBuffer,
     std::unique_ptr<llvm::MemoryBuffer> moduleDocInputBuffer,
     std::unique_ptr<llvm::MemoryBuffer> moduleSourceInfoInputBuffer,
-    bool isFramework, bool treatAsPartialModule) {
+    bool isFramework) {
   assert(moduleInputBuffer);
 
   StringRef moduleBufferID = moduleInputBuffer->getBufferIdentifier();
@@ -688,8 +688,7 @@ FileUnit *SerializedModuleLoaderBase::loadAST(
 
     auto diagLocOrInvalid = diagLoc.getValueOr(SourceLoc());
     loadInfo.status =
-        loadedModuleFile->associateWithFileContext(fileUnit, diagLocOrInvalid,
-                                                   treatAsPartialModule);
+        loadedModuleFile->associateWithFileContext(fileUnit, diagLocOrInvalid);
 
     // FIXME: This seems wrong. Overlay for system Clang module doesn't
     // necessarily mean it's "system" module. User can make their own overlay
@@ -963,8 +962,7 @@ SerializedModuleLoaderBase::loadModule(SourceLoc importLoc,
 
   if (!loadAST(*M, moduleID.Loc, moduleInterfacePathStr,
                std::move(moduleInputBuffer), std::move(moduleDocInputBuffer),
-               std::move(moduleSourceInfoInputBuffer),
-               isFramework, /*treatAsPartialModule*/false)) {
+               std::move(moduleSourceInfoInputBuffer), isFramework)) {
     M->setFailedToLoad();
   }
 
@@ -990,7 +988,6 @@ MemoryBufferSerializedModuleLoader::loadModule(SourceLoc importLoc,
     return nullptr;
 
   bool isFramework = false;
-  bool treatAsPartialModule = false;
   std::unique_ptr<llvm::MemoryBuffer> moduleInputBuffer;
   moduleInputBuffer = std::move(bufIter->second);
   MemoryBuffers.erase(bufIter);
@@ -1000,8 +997,7 @@ MemoryBufferSerializedModuleLoader::loadModule(SourceLoc importLoc,
   SWIFT_DEFER { M->setHasResolvedImports(); };
 
   if (!loadAST(*M, moduleID.Loc, /*moduleInterfacePath*/ "",
-               std::move(moduleInputBuffer), {}, {},
-               isFramework, treatAsPartialModule)) {
+               std::move(moduleInputBuffer), {}, {}, isFramework)) {
     return nullptr;
   }
 

tools/SourceKit/lib/SwiftLang/SwiftIndexing.cpp

@@ -186,8 +186,7 @@ static void indexModule(llvm::MemoryBuffer *Input,
     // correct filename here.
     auto FUnit = Loader->loadAST(*Mod, None, /*moduleInterfacePath*/"",
                                  std::move(Buf), nullptr, nullptr,
-                                 /*isFramework*/false,
-                                 /*treatAsPartialModule*/false);
+                                 /*isFramework*/false);
 
     // FIXME: Not knowing what went wrong is pretty bad. loadModule() should be
     // more modular, rather than emitting diagnostics itself.