forked from OSchip/llvm-project
85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
//===--- FSProvider.cpp - VFS provider for ClangdServer -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "FSProvider.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/VirtualFileSystem.h"
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#include <memory>
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namespace clang {
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namespace clangd {
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namespace {
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/// Always opens files in the underlying filesystem as "volatile", meaning they
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/// won't be memory-mapped. This avoid locking the files on Windows.
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class VolatileFileSystem : public llvm::vfs::ProxyFileSystem {
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public:
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explicit VolatileFileSystem(llvm::IntrusiveRefCntPtr<FileSystem> FS)
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: ProxyFileSystem(std::move(FS)) {}
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llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
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openFileForRead(const llvm::Twine &InPath) override {
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llvm::SmallString<128> Path;
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InPath.toVector(Path);
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auto File = getUnderlyingFS().openFileForRead(Path);
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if (!File)
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return File;
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// Try to guess preamble files, they can be memory-mapped even on Windows as
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// clangd has exclusive access to those.
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llvm::StringRef FileName = llvm::sys::path::filename(Path);
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if (FileName.startswith("preamble-") && FileName.endswith(".pch"))
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return File;
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return std::unique_ptr<VolatileFile>(new VolatileFile(std::move(*File)));
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}
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private:
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class VolatileFile : public llvm::vfs::File {
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public:
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VolatileFile(std::unique_ptr<llvm::vfs::File> Wrapped)
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: Wrapped(std::move(Wrapped)) {
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assert(this->Wrapped);
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}
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virtual llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
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getBuffer(const llvm::Twine &Name, int64_t FileSize,
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bool RequiresNullTerminator, bool /*IsVolatile*/) override {
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return Wrapped->getBuffer(Name, FileSize, RequiresNullTerminator,
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/*IsVolatile=*/true);
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}
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llvm::ErrorOr<llvm::vfs::Status> status() override {
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return Wrapped->status();
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}
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llvm::ErrorOr<std::string> getName() override { return Wrapped->getName(); }
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std::error_code close() override { return Wrapped->close(); }
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private:
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std::unique_ptr<File> Wrapped;
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};
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};
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} // namespace
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>
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clang::clangd::RealFileSystemProvider::getFileSystem() const {
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// Avoid using memory-mapped files on Windows, they cause file locking issues.
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// FIXME: Try to use a similar approach in Sema instead of relying on
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// propagation of the 'isVolatile' flag through all layers.
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#ifdef _WIN32
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return new VolatileFileSystem(llvm::vfs::getRealFileSystem());
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#else
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return llvm::vfs::getRealFileSystem();
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#endif
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}
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} // namespace clangd
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} // namespace clang
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