[Explicit Module Loader] Refactor ESWL to use findModule instead of findModuleFilesInDirectory

And add isFramework to the Explicit Module Map and its parser.

include/swift/Frontend/ModuleInterfaceLoader.h

@@ -112,6 +112,7 @@
 #include "swift/Frontend/ModuleInterfaceSupport.h"
 #include "swift/Serialization/SerializedModuleLoader.h"
 #include "llvm/Support/StringSaver.h"
+#include <sstream>
 
 namespace clang {
 class CompilerInstance;
@@ -133,14 +134,22 @@ class ExplicitSwiftModuleLoader: public SerializedModuleLoaderBase {
   explicit ExplicitSwiftModuleLoader(ASTContext &ctx, DependencyTracker *tracker,
                                      ModuleLoadingMode loadMode,
                                      bool IgnoreSwiftSourceInfoFile);
+
+  bool findModule(AccessPathElem moduleID,
+                  SmallVectorImpl<char> *moduleInterfacePath,
+                  std::unique_ptr<llvm::MemoryBuffer> *moduleBuffer,
+                  std::unique_ptr<llvm::MemoryBuffer> *moduleDocBuffer,
+                  std::unique_ptr<llvm::MemoryBuffer> *moduleSourceInfoBuffer,
+                  bool &isFramework, bool &isSystemModule) override;
+
   std::error_code findModuleFilesInDirectory(
-    AccessPathElem ModuleID,
+                  AccessPathElem ModuleID,
-    const SerializedModuleBaseName &BaseName,
+                  const SerializedModuleBaseName &BaseName,
-    SmallVectorImpl<char> *ModuleInterfacePath,
+                  SmallVectorImpl<char> *ModuleInterfacePath,
-    std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
+                  std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
-    std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
+                  std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
-    std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
+                  std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
-    bool IsFramework) override;
+                  bool IsFramework) override;
 
   bool canImportModule(Located<Identifier> mID) override;
 
@@ -173,6 +182,8 @@ struct ExplicitModuleInfo {
   std::string moduleSourceInfoPath;
   // Opened buffer for the .swiftmodule file.
   std::unique_ptr<llvm::MemoryBuffer> moduleBuffer;
+  // A flag that indicates whether this module is a framework
+  bool isFramework;
 };
 
 /// Parser of explicit module maps passed into the compiler.
@@ -182,12 +193,14 @@ struct ExplicitModuleInfo {
 //      "modulePath": "A.swiftmodule",
 //      "docPath": "A.swiftdoc",
 //      "sourceInfoPath": "A.swiftsourceinfo"
+//      "isFramework": false
 //    },
 //    {
 //      "moduleName": "B",
 //      "modulePath": "B.swiftmodule",
 //      "docPath": "B.swiftdoc",
 //      "sourceInfoPath": "B.swiftsourceinfo"
+//      "isFramework": false
 //    }
 //  ]
 class ExplicitModuleMapParser {
@@ -249,6 +262,9 @@ private:
         result.moduleDocPath = val.str();
       } else if (key == "sourceInfoPath") {
         result.moduleSourceInfoPath = val.str();
+      } else if (key == "isFramework") {
+        std::istringstream is(val.str());
+        is >> std::boolalpha >> result.isFramework;
       } else {
         // Being forgiving for future fields.
         continue;

include/swift/Serialization/SerializedModuleLoader.h

@@ -73,12 +73,12 @@ protected:
                                              StringRef extension) const;
 
   using AccessPathElem = Located<Identifier>;
-  bool findModule(AccessPathElem moduleID,
+  virtual bool findModule(AccessPathElem moduleID,
-                  SmallVectorImpl<char> *moduleInterfacePath,
+                          SmallVectorImpl<char> *moduleInterfacePath,
-                  std::unique_ptr<llvm::MemoryBuffer> *moduleBuffer,
+                          std::unique_ptr<llvm::MemoryBuffer> *moduleBuffer,
-                  std::unique_ptr<llvm::MemoryBuffer> *moduleDocBuffer,
+                          std::unique_ptr<llvm::MemoryBuffer> *moduleDocBuffer,
-                  std::unique_ptr<llvm::MemoryBuffer> *moduleSourceInfoBuffer,
+                          std::unique_ptr<llvm::MemoryBuffer> *moduleSourceInfoBuffer,
-                  bool &isFramework, bool &isSystemModule);
+                          bool &isFramework, bool &isSystemModule);
 
   /// Attempts to search the provided directory for a loadable serialized
   /// .swiftmodule with the provided `ModuleFilename`. Subclasses must

lib/Frontend/ModuleInterfaceLoader.cpp

@@ -1522,29 +1522,30 @@ ExplicitSwiftModuleLoader::ExplicitSwiftModuleLoader(
 
 ExplicitSwiftModuleLoader::~ExplicitSwiftModuleLoader() { delete &Impl; }
 
-std::error_code ExplicitSwiftModuleLoader::findModuleFilesInDirectory(
+bool ExplicitSwiftModuleLoader::findModule(AccessPathElem ModuleID,
-    AccessPathElem ModuleID,
+           SmallVectorImpl<char> *ModuleInterfacePath,
-    const SerializedModuleBaseName &BaseName,
+           std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
-    SmallVectorImpl<char> *ModuleInterfacePath,
+           std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
-    std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
+           std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
-    std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
+           bool &IsFramework, bool &IsSystemModule) {
-    std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
-    bool IsFramework) {
   StringRef moduleName = ModuleID.Item.str();
   auto it = Impl.ExplicitModuleMap.find(moduleName);
   // If no explicit module path is given matches the name, return with an
   // error code.
   if (it == Impl.ExplicitModuleMap.end()) {
-    return std::make_error_code(std::errc::not_supported);
+    return false;
   }
   auto &moduleInfo = it->getValue();
   if (moduleInfo.moduleBuffer) {
     // We found an explicit module matches the given name, give the buffer
     // back to the caller side.
     *ModuleBuffer = std::move(moduleInfo.moduleBuffer);
-    return std::error_code();
+    return true;
   }
 
+  // Set IsFramework bit according to the moduleInfo
+  IsFramework = moduleInfo.isFramework;
+
   auto &fs = *Ctx.SourceMgr.getFileSystem();
   // Open .swiftmodule file
   auto moduleBuf = fs.getBufferForFile(moduleInfo.modulePath);
@@ -1552,7 +1553,7 @@ std::error_code ExplicitSwiftModuleLoader::findModuleFilesInDirectory(
     // We cannot read the module content, diagnose.
     Ctx.Diags.diagnose(SourceLoc(), diag::error_opening_explicit_module_file,
                        moduleInfo.modulePath);
-    return moduleBuf.getError();
+    return false;
   }
 
   assert(moduleBuf);
@@ -1568,13 +1569,13 @@ std::error_code ExplicitSwiftModuleLoader::findModuleFilesInDirectory(
         // We cannot read the module content, diagnose.
         Ctx.Diags.diagnose(SourceLoc(), diag::error_opening_explicit_module_file,
                            moduleInfo.modulePath);
-        return moduleBuf.getError();
+        return false;
       }
     } else {
       // We cannot read the module content, diagnose.
       Ctx.Diags.diagnose(SourceLoc(), diag::error_opening_explicit_module_file,
                          moduleInfo.modulePath);
-      return forwardingModule.getError();
+      return false;
     }
   }
   assert(moduleBuf);
@@ -1593,7 +1594,19 @@ std::error_code ExplicitSwiftModuleLoader::findModuleFilesInDirectory(
     if (moduleSourceInfoBuf)
       *ModuleSourceInfoBuffer = std::move(moduleSourceInfoBuf.get());
   }
-  return std::error_code();
+  return true;
+}
+
+std::error_code ExplicitSwiftModuleLoader::findModuleFilesInDirectory(
+  AccessPathElem ModuleID,
+  const SerializedModuleBaseName &BaseName,
+  SmallVectorImpl<char> *ModuleInterfacePath,
+  std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
+  std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
+  std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
+  bool IsFramework) {
+  llvm_unreachable("Not supported in the Explicit Swift Module Loader.");
+  return std::make_error_code(std::errc::not_supported);
 }
 
 bool ExplicitSwiftModuleLoader::canImportModule(

lib/Serialization/SerializedModuleLoader.cpp

@@ -682,7 +682,6 @@ FileUnit *SerializedModuleLoaderBase::loadAST(
     std::unique_ptr<llvm::MemoryBuffer> moduleSourceInfoInputBuffer,
     bool isFramework) {
   assert(moduleInputBuffer);
-
   StringRef moduleBufferID = moduleInputBuffer->getBufferIdentifier();
   StringRef moduleDocBufferID;
   if (moduleDocInputBuffer)
@@ -993,7 +992,6 @@ SerializedModuleLoaderBase::loadModule(SourceLoc importLoc,
 
   StringRef moduleInterfacePathStr =
     Ctx.AllocateCopy(moduleInterfacePath.str());
-
   auto *file =
       loadAST(*M, moduleID.Loc, moduleInterfacePathStr,
               std::move(moduleInputBuffer), std::move(moduleDocInputBuffer),