| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "clang/Serialization/ModuleCache.h" |
| 10 | |
| 11 | #include "clang/Serialization/InMemoryModuleCache.h" |
| 12 | #include "clang/Serialization/ModuleFile.h" |
| 13 | #include "llvm/Support/FileSystem.h" |
| 14 | #include "llvm/Support/LockFileManager.h" |
| 15 | #include "llvm/Support/Path.h" |
| 16 | |
| 17 | using namespace clang; |
| 18 | |
| 19 | namespace { |
| 20 | class CrossProcessModuleCache : public ModuleCache { |
| 21 | InMemoryModuleCache InMemory; |
| 22 | |
| 23 | public: |
| 24 | void prepareForGetLock(StringRef ModuleFilename) override { |
| 25 | // FIXME: Do this in LockFileManager and only if the directory doesn't |
| 26 | // exist. |
| 27 | StringRef Dir = llvm::sys::path::parent_path(path: ModuleFilename); |
| 28 | llvm::sys::fs::create_directories(path: Dir); |
| 29 | } |
| 30 | |
| 31 | std::unique_ptr<llvm::AdvisoryLock> |
| 32 | getLock(StringRef ModuleFilename) override { |
| 33 | return std::make_unique<llvm::LockFileManager>(args&: ModuleFilename); |
| 34 | } |
| 35 | |
| 36 | std::time_t getModuleTimestamp(StringRef ModuleFilename) override { |
| 37 | std::string TimestampFilename = |
| 38 | serialization::ModuleFile::getTimestampFilename(FileName: ModuleFilename); |
| 39 | llvm::sys::fs::file_status Status; |
| 40 | if (llvm::sys::fs::status(path: TimestampFilename, result&: Status) != std::error_code{}) |
| 41 | return 0; |
| 42 | return llvm::sys::toTimeT(TP: Status.getLastModificationTime()); |
| 43 | } |
| 44 | |
| 45 | void updateModuleTimestamp(StringRef ModuleFilename) override { |
| 46 | // Overwrite the timestamp file contents so that file's mtime changes. |
| 47 | std::error_code EC; |
| 48 | llvm::raw_fd_ostream OS( |
| 49 | serialization::ModuleFile::getTimestampFilename(FileName: ModuleFilename), EC, |
| 50 | llvm::sys::fs::OF_TextWithCRLF); |
| 51 | if (EC) |
| 52 | return; |
| 53 | OS << "Timestamp file\n"; |
| 54 | OS.close(); |
| 55 | OS.clear_error(); // Avoid triggering a fatal error. |
| 56 | } |
| 57 | |
| 58 | InMemoryModuleCache &getInMemoryModuleCache() override { return InMemory; } |
| 59 | const InMemoryModuleCache &getInMemoryModuleCache() const override { |
| 60 | return InMemory; |
| 61 | } |
| 62 | }; |
| 63 | } // namespace |
| 64 | |
| 65 | IntrusiveRefCntPtr<ModuleCache> clang::createCrossProcessModuleCache() { |
| 66 | return llvm::makeIntrusiveRefCnt<CrossProcessModuleCache>(); |
| 67 | } |
| 68 |