Author: ioeric Date: Tue Sep 25 07:02:01 2018 New Revision: 342976 URL: http://llvm.org/viewvc/llvm-project?rev=342976&view=rev Log: [VFS] Add a proxy FS that delegates calls to underlying FS by default.
Summary: This is useful when derived file systems want to override some calls and still proxy other calls. Reviewers: ilya-biryukov, sammccall Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D52462 Modified: cfe/trunk/include/clang/Basic/VirtualFileSystem.h Modified: cfe/trunk/include/clang/Basic/VirtualFileSystem.h URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/VirtualFileSystem.h?rev=342976&r1=342975&r2=342976&view=diff ============================================================================== --- cfe/trunk/include/clang/Basic/VirtualFileSystem.h (original) +++ cfe/trunk/include/clang/Basic/VirtualFileSystem.h Tue Sep 25 07:02:01 2018 @@ -335,6 +335,42 @@ public: const_iterator overlays_end() const { return FSList.rend(); } }; +/// By default, this delegates all calls to the underlying file system. This +/// is useful when derived file systems want to override some calls and still +/// proxy other calls. +class ProxyFileSystem : public FileSystem { +public: + explicit ProxyFileSystem(IntrusiveRefCntPtr<FileSystem> FS) + : FS(std::move(FS)) {} + + llvm::ErrorOr<Status> status(const Twine &Path) override { + return FS->status(Path); + } + llvm::ErrorOr<std::unique_ptr<File>> + openFileForRead(const Twine &Path) override { + return FS->openFileForRead(Path); + } + directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override { + return FS->dir_begin(Dir, EC); + } + llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override { + return FS->getCurrentWorkingDirectory(); + } + std::error_code setCurrentWorkingDirectory(const Twine &Path) override { + return FS->setCurrentWorkingDirectory(Path); + } + std::error_code getRealPath(const Twine &Path, + SmallVectorImpl<char> &Output) const override { + return FS->getRealPath(Path, Output); + } + +protected: + FileSystem &getUnderlyingFS() { return *FS; } + +private: + IntrusiveRefCntPtr<FileSystem> FS; +}; + namespace detail { class InMemoryDirectory; _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
