Revert "[clangd] [Modules] Fixes to correctly handle module dependencies" (llvm#142162)

Author: fleeting-xx

clang-tools-extra/clangd/ModulesBuilder.cpp

@@ -84,7 +84,8 @@ class FailedPrerequisiteModules : public PrerequisiteModules {
 
   // We shouldn't adjust the compilation commands based on
   // FailedPrerequisiteModules.
-  void adjustHeaderSearchOptions(HeaderSearchOptions &Options) const override {}
+  void adjustHeaderSearchOptions(HeaderSearchOptions &Options) const override {
+  }
 
   // FailedPrerequisiteModules can never be reused.
   bool
@@ -429,21 +430,21 @@ class CachingProjectModules : public ProjectModules {
 /// Collect the directly and indirectly required module names for \param
 /// ModuleName in topological order. The \param ModuleName is guaranteed to
 /// be the last element in \param ModuleNames.
-llvm::SmallVector<std::string> getAllRequiredModules(PathRef RequiredSource,
-                                                     CachingProjectModules &MDB,
-                                                     StringRef ModuleName) {
-  llvm::SmallVector<std::string> ModuleNames;
+llvm::SmallVector<StringRef> getAllRequiredModules(PathRef RequiredSource,
+                                                   CachingProjectModules &MDB,
+                                                   StringRef ModuleName) {
+  llvm::SmallVector<llvm::StringRef> ModuleNames;
   llvm::StringSet<> ModuleNamesSet;
 
   auto VisitDeps = [&](StringRef ModuleName, auto Visitor) -> void {
     ModuleNamesSet.insert(ModuleName);
 
-    for (const std::string &RequiredModuleName : MDB.getRequiredModules(
+    for (StringRef RequiredModuleName : MDB.getRequiredModules(
              MDB.getSourceForModuleName(ModuleName, RequiredSource)))
       if (ModuleNamesSet.insert(RequiredModuleName).second)
         Visitor(RequiredModuleName, Visitor);
 
-    ModuleNames.push_back(ModuleName.str());
+    ModuleNames.push_back(ModuleName);
   };
   VisitDeps(ModuleName, VisitDeps);
 
@@ -493,30 +494,28 @@ llvm::Error ModulesBuilder::ModulesBuilderImpl::getOrBuildModuleFile(
   // Get Required modules in topological order.
   auto ReqModuleNames = getAllRequiredModules(RequiredSource, MDB, ModuleName);
   for (llvm::StringRef ReqModuleName : ReqModuleNames) {
-    if (BuiltModuleFiles.isModuleUnitBuilt(ReqModuleName))
+    if (BuiltModuleFiles.isModuleUnitBuilt(ModuleName))
       continue;
 
     if (auto Cached = Cache.getModule(ReqModuleName)) {
       if (IsModuleFileUpToDate(Cached->getModuleFilePath(), BuiltModuleFiles,
                                TFS.view(std::nullopt))) {
-        log("Reusing module {0} from {1}", ReqModuleName,
+        log("Reusing module {0} from {1}", ModuleName,
             Cached->getModuleFilePath());
         BuiltModuleFiles.addModuleFile(std::move(Cached));
         continue;
       }
       Cache.remove(ReqModuleName);
     }
 
-    std::string ReqFileName =
-        MDB.getSourceForModuleName(ReqModuleName, RequiredSource);
     llvm::Expected<ModuleFile> MF = buildModuleFile(
-        ReqModuleName, ReqFileName, getCDB(), TFS, BuiltModuleFiles);
+        ModuleName, ModuleUnitFileName, getCDB(), TFS, BuiltModuleFiles);
     if (llvm::Error Err = MF.takeError())
       return Err;
 
-    log("Built module {0} to {1}", ReqModuleName, MF->getModuleFilePath());
+    log("Built module {0} to {1}", ModuleName, MF->getModuleFilePath());
     auto BuiltModuleFile = std::make_shared<const ModuleFile>(std::move(*MF));
-    Cache.add(ReqModuleName, BuiltModuleFile);
+    Cache.add(ModuleName, BuiltModuleFile);
     BuiltModuleFiles.addModuleFile(std::move(BuiltModuleFile));
   }
 

clang-tools-extra/clangd/test/module_dependencies.test

@@ -1,16 +1,16 @@
 # A smoke test to check the modules can work basically.
 #
+# Windows have different escaping modes.
+# FIXME: We should add one for windows.
+# UNSUPPORTED: system-windows
+#
 # RUN: rm -fr %t
 # RUN: mkdir -p %t
 # RUN: split-file %s %t
 #
 # RUN: sed -e "s|DIR|%/t|g" %t/compile_commands.json.tmpl > %t/compile_commands.json.tmp
 # RUN: sed -e "s|CLANG_CC|%clang|g" %t/compile_commands.json.tmp > %t/compile_commands.json
-# RUN: sed -e "s|DIR|%/t|g" %t/definition.jsonrpc.tmpl > %t/definition.jsonrpc.tmp
-#
-# On Windows, we need the URI in didOpen to look like "uri":"file:///C:/..."
-# (with the extra slash in the front), so we add it here.
-# RUN: sed -E -e 's|"file://([A-Z]):/|"file:///\1:/|g' %/t/definition.jsonrpc.tmp > %/t/definition.jsonrpc
+# RUN: sed -e "s|DIR|%/t|g" %t/definition.jsonrpc.tmpl > %t/definition.jsonrpc
 #
 # RUN: clangd -experimental-modules-support -lit-test < %t/definition.jsonrpc \
 # RUN:      | FileCheck -strict-whitespace %t/definition.jsonrpc