================
@@ -338,17 +460,129 @@ ModulesBuilder::buildPrerequisiteModulesFor(PathRef File,
return std::move(RequiredModules);
}
-bool StandalonePrerequisiteModules::canReuse(
+ReusableModulesBuilder::ModuleBuildingSharedOwner
+ReusableModulesBuilder::getOrCreateModuleBuildingOwner(StringRef ModuleName) {
+ std::lock_guard<std::mutex> _(ModulesBuildingMutex);
+
+ auto MutexIter = BuildingModuleMutexes.find(ModuleName);
+ if (MutexIter == BuildingModuleMutexes.end())
+ MutexIter = BuildingModuleMutexes
+ .try_emplace(ModuleName, std::make_shared<std::mutex>())
+ .first;
+
+ auto CVIter = BuildingModuleCVs.find(ModuleName);
+ if (CVIter == BuildingModuleCVs.end())
+ CVIter = BuildingModuleCVs
+ .try_emplace(ModuleName,
+ std::make_shared<std::condition_variable>())
+ .first;
+
+ return ModuleBuildingSharedOwner(ModuleName, MutexIter->getValue(),
+ CVIter->getValue(), *this);
+}
+
+llvm::Error ReusableModulesBuilder::getOrBuildModuleFile(
+ StringRef ModuleName, const ThreadsafeFS &TFS, ProjectModules &MDB,
+ ReusablePrerequisiteModules &BuiltModuleFiles) {
+ if (BuiltModuleFiles.isModuleUnitBuilt(ModuleName))
+ return llvm::Error::success();
+
+ PathRef ModuleUnitFileName = MDB.getSourceForModuleName(ModuleName);
+ /// It is possible that we're meeting third party modules (modules whose
+ /// source are not in the project. e.g, the std module may be a third-party
+ /// module for most project) or something wrong with the implementation of
+ /// ProjectModules.
+ /// FIXME: How should we treat third party modules here? If we want to ignore
+ /// third party modules, we should return true instead of false here.
+ /// Currently we simply bail out.
+ if (ModuleUnitFileName.empty())
+ return llvm::createStringError(
+ llvm::formatv("Don't get the module unit for module {0}", ModuleName));
+
+ for (auto &RequiredModuleName : MDB.getRequiredModules(ModuleUnitFileName))
+ // Return early if there are errors building the module file.
+ if (!getOrBuildModuleFile(RequiredModuleName, TFS, MDB, BuiltModuleFiles))
+ return llvm::createStringError(
+ llvm::formatv("Failed to build module {0}", RequiredModuleName));
+
+ if (std::shared_ptr<ModuleFile> Cached =
+ getValidModuleFile(ModuleName, MDB, TFS, BuiltModuleFiles)) {
+ log("Reusing module {0} from {1}", ModuleName, Cached->ModuleFilePath);
+ BuiltModuleFiles.addModuleFile(Cached);
+ return llvm::Error::success();
+ }
+
+ ModuleBuildingSharedOwner ModuleBuildingOwner =
+ getOrCreateModuleBuildingOwner(ModuleName);
+
+ std::condition_variable &CV = ModuleBuildingOwner.getCV();
+ std::unique_lock<std::mutex> lk(ModuleBuildingOwner.getMutex());
+ if (!ModuleBuildingOwner.isUniqueBuildingOwner()) {
----------------
ChuanqiXu9 wrote:
Done. Sounds not bad.
https://github.com/llvm/llvm-project/pull/106683
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