================
@@ -316,36 +287,169 @@ llvm::Error buildModuleFile(llvm::StringRef ModuleName,
if (Clang->getDiagnostics().hasErrorOccurred())
return llvm::createStringError("Compilation failed");
- BuiltModuleFiles.addModuleFile(ModuleName, Inputs.CompileCommand.Output);
- return llvm::Error::success();
+ return ModuleFile{ModuleName, Inputs.CompileCommand.Output};
+}
+
+bool ReusablePrerequisiteModules::canReuse(
+ const CompilerInvocation &CI,
+ llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) const {
+ if (RequiredModules.empty())
+ return true;
+
+ SmallVector<StringRef> BMIPaths;
+ for (auto &MF : RequiredModules)
+ BMIPaths.push_back(MF->ModuleFilePath);
+ return IsModuleFilesUpToDate(BMIPaths, *this, VFS);
}
} // namespace
+class ModulesBuilder::ModuleFileCache {
+public:
+ ModuleFileCache(const GlobalCompilationDatabase &CDB) : CDB(CDB) {}
+
+ llvm::Error
+ getOrBuildModuleFile(StringRef ModuleName, const ThreadsafeFS &TFS,
+ ProjectModules &MDB,
+ ReusablePrerequisiteModules &RequiredModules);
+ const GlobalCompilationDatabase &getCDB() const { return CDB; }
+
+private:
+ std::shared_ptr<ModuleFile>
+ getValidModuleFile(StringRef ModuleName, ProjectModules &MDB,
+ const ThreadsafeFS &TFS,
+ PrerequisiteModules &BuiltModuleFiles);
+
+ /// This should only be called by getValidModuleFile. This is unlocked
version
+ /// of getValidModuleFile. The function is extracted to avoid dead locks when
+ /// recursing.
+ std::shared_ptr<ModuleFile>
+ isValidModuleFileUnlocked(StringRef ModuleName, ProjectModules &MDB,
+ const ThreadsafeFS &TFS,
+ PrerequisiteModules &BuiltModuleFiles);
+
+ const GlobalCompilationDatabase &CDB;
+
+ llvm::StringMap<std::shared_ptr<ModuleFile>> ModuleFiles;
----------------
kadircet wrote:
is this an issue you've seen in practice or just a thought experiment ?
I was also mentioning this on the change itself, but in such a scenario every
TU doesn't just own a `module` they own a `PrerequisiteModules` object, which
underneath keeps a handle to all the required modules. Hence in your example TU
`D` should keep both module `A` and `B` alive.
https://github.com/llvm/llvm-project/pull/106683
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