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: prepareForGetLock(StringRef ModuleFilename)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(ModuleFilename); 28 llvm::sys::fs::create_directories(Dir); 29 } 30 31 std::unique_ptr<llvm::AdvisoryLock> getLock(StringRef ModuleFilename)32 getLock(StringRef ModuleFilename) override { 33 return std::make_unique<llvm::LockFileManager>(ModuleFilename); 34 } 35 getModuleTimestamp(StringRef ModuleFilename)36 std::time_t getModuleTimestamp(StringRef ModuleFilename) override { 37 std::string TimestampFilename = 38 serialization::ModuleFile::getTimestampFilename(ModuleFilename); 39 llvm::sys::fs::file_status Status; 40 if (llvm::sys::fs::status(TimestampFilename, Status) != std::error_code{}) 41 return 0; 42 return llvm::sys::toTimeT(Status.getLastModificationTime()); 43 } 44 updateModuleTimestamp(StringRef ModuleFilename)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(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 getInMemoryModuleCache()58 InMemoryModuleCache &getInMemoryModuleCache() override { return InMemory; } getInMemoryModuleCache() const59 const InMemoryModuleCache &getInMemoryModuleCache() const override { 60 return InMemory; 61 } 62 }; 63 } // namespace 64 createCrossProcessModuleCache()65IntrusiveRefCntPtr<ModuleCache> clang::createCrossProcessModuleCache() { 66 return llvm::makeIntrusiveRefCnt<CrossProcessModuleCache>(); 67 } 68