1 //===--------------------- ModuleCache.cpp ----------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "lldb/Target/ModuleCache.h"
12 #include "lldb/Core/Module.h"
13 #include "lldb/Core/ModuleList.h"
14 #include "lldb/Core/ModuleSpec.h"
15 #include "lldb/Host/File.h"
16 #include "lldb/Host/LockFile.h"
17 #include "lldb/Utility/Log.h"
18 #include "llvm/Support/FileSystem.h"
19 #include "llvm/Support/FileUtilities.h"
26 using namespace lldb_private;
30 const char *kModulesSubdir = ".cache";
31 const char *kLockDirName = ".lock";
32 const char *kTempFileName = ".temp";
33 const char *kTempSymFileName = ".symtemp";
34 const char *kSymFileExtension = ".sym";
35 const char *kFSIllegalChars = "\\/:*?\"<>|";
37 std::string GetEscapedHostname(const char *hostname) {
38 if (hostname == nullptr)
40 std::string result(hostname);
41 size_t size = result.size();
42 for (size_t i = 0; i < size; ++i) {
43 if ((result[i] >= 1 && result[i] <= 31) ||
44 strchr(kFSIllegalChars, result[i]) != nullptr)
53 std::unique_ptr<lldb_private::LockFile> m_lock;
57 ModuleLock(const FileSpec &root_dir_spec, const UUID &uuid, Status &error);
61 static FileSpec JoinPath(const FileSpec &path1, const char *path2) {
62 FileSpec result_spec(path1);
63 result_spec.AppendPathComponent(path2);
67 static Status MakeDirectory(const FileSpec &dir_path) {
68 namespace fs = llvm::sys::fs;
70 return fs::create_directories(dir_path.GetPath(), true, fs::perms::owner_all);
73 FileSpec GetModuleDirectory(const FileSpec &root_dir_spec, const UUID &uuid) {
74 const auto modules_dir_spec = JoinPath(root_dir_spec, kModulesSubdir);
75 return JoinPath(modules_dir_spec, uuid.GetAsString().c_str());
78 FileSpec GetSymbolFileSpec(const FileSpec &module_file_spec) {
79 return FileSpec(module_file_spec.GetPath() + kSymFileExtension);
82 void DeleteExistingModule(const FileSpec &root_dir_spec,
83 const FileSpec &sysroot_module_path_spec) {
84 Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_MODULES));
88 std::make_shared<Module>(ModuleSpec(sysroot_module_path_spec));
89 module_uuid = module_sp->GetUUID();
92 if (!module_uuid.IsValid())
96 ModuleLock lock(root_dir_spec, module_uuid, error);
99 log->Printf("Failed to lock module %s: %s",
100 module_uuid.GetAsString().c_str(), error.AsCString());
103 namespace fs = llvm::sys::fs;
105 if (status(sysroot_module_path_spec.GetPath(), st))
108 if (st.getLinkCount() > 2) // module is referred by other hosts.
111 const auto module_spec_dir = GetModuleDirectory(root_dir_spec, module_uuid);
112 llvm::sys::fs::remove_directories(module_spec_dir.GetPath());
116 void DecrementRefExistingModule(const FileSpec &root_dir_spec,
117 const FileSpec &sysroot_module_path_spec) {
118 // Remove $platform/.cache/$uuid folder if nobody else references it.
119 DeleteExistingModule(root_dir_spec, sysroot_module_path_spec);
121 // Remove sysroot link.
122 llvm::sys::fs::remove(sysroot_module_path_spec.GetPath());
124 FileSpec symfile_spec = GetSymbolFileSpec(sysroot_module_path_spec);
125 llvm::sys::fs::remove(symfile_spec.GetPath());
128 Status CreateHostSysRootModuleLink(const FileSpec &root_dir_spec,
129 const char *hostname,
130 const FileSpec &platform_module_spec,
131 const FileSpec &local_module_spec,
132 bool delete_existing) {
133 const auto sysroot_module_path_spec =
134 JoinPath(JoinPath(root_dir_spec, hostname),
135 platform_module_spec.GetPath().c_str());
136 if (FileSystem::Instance().Exists(sysroot_module_path_spec)) {
137 if (!delete_existing)
140 DecrementRefExistingModule(root_dir_spec, sysroot_module_path_spec);
143 const auto error = MakeDirectory(
144 FileSpec(sysroot_module_path_spec.GetDirectory().AsCString()));
148 return llvm::sys::fs::create_hard_link(local_module_spec.GetPath(),
149 sysroot_module_path_spec.GetPath());
154 ModuleLock::ModuleLock(const FileSpec &root_dir_spec, const UUID &uuid,
156 const auto lock_dir_spec = JoinPath(root_dir_spec, kLockDirName);
157 error = MakeDirectory(lock_dir_spec);
161 m_file_spec = JoinPath(lock_dir_spec, uuid.GetAsString().c_str());
162 FileSystem::Instance().Open(m_file, m_file_spec,
163 File::eOpenOptionWrite |
164 File::eOpenOptionCanCreate |
165 File::eOpenOptionCloseOnExec);
167 error.SetErrorToErrno();
171 m_lock.reset(new lldb_private::LockFile(m_file.GetDescriptor()));
172 error = m_lock->WriteLock(0, 1);
174 error.SetErrorStringWithFormat("Failed to lock file: %s",
178 void ModuleLock::Delete() {
183 llvm::sys::fs::remove(m_file_spec.GetPath());
186 /////////////////////////////////////////////////////////////////////////
188 Status ModuleCache::Put(const FileSpec &root_dir_spec, const char *hostname,
189 const ModuleSpec &module_spec, const FileSpec &tmp_file,
190 const FileSpec &target_file) {
191 const auto module_spec_dir =
192 GetModuleDirectory(root_dir_spec, module_spec.GetUUID());
193 const auto module_file_path =
194 JoinPath(module_spec_dir, target_file.GetFilename().AsCString());
196 const auto tmp_file_path = tmp_file.GetPath();
197 const auto err_code =
198 llvm::sys::fs::rename(tmp_file_path, module_file_path.GetPath());
200 return Status("Failed to rename file %s to %s: %s", tmp_file_path.c_str(),
201 module_file_path.GetPath().c_str(),
202 err_code.message().c_str());
204 const auto error = CreateHostSysRootModuleLink(
205 root_dir_spec, hostname, target_file, module_file_path, true);
207 return Status("Failed to create link to %s: %s",
208 module_file_path.GetPath().c_str(), error.AsCString());
212 Status ModuleCache::Get(const FileSpec &root_dir_spec, const char *hostname,
213 const ModuleSpec &module_spec,
214 ModuleSP &cached_module_sp, bool *did_create_ptr) {
216 m_loaded_modules.find(module_spec.GetUUID().GetAsString());
217 if (find_it != m_loaded_modules.end()) {
218 cached_module_sp = (*find_it).second.lock();
219 if (cached_module_sp)
221 m_loaded_modules.erase(find_it);
224 const auto module_spec_dir =
225 GetModuleDirectory(root_dir_spec, module_spec.GetUUID());
226 const auto module_file_path = JoinPath(
227 module_spec_dir, module_spec.GetFileSpec().GetFilename().AsCString());
229 if (!FileSystem::Instance().Exists(module_file_path))
230 return Status("Module %s not found", module_file_path.GetPath().c_str());
231 if (FileSystem::Instance().GetByteSize(module_file_path) !=
232 module_spec.GetObjectSize())
233 return Status("Module %s has invalid file size",
234 module_file_path.GetPath().c_str());
236 // We may have already cached module but downloaded from an another host - in
237 // this case let's create a link to it.
238 auto error = CreateHostSysRootModuleLink(root_dir_spec, hostname,
239 module_spec.GetFileSpec(),
240 module_file_path, false);
242 return Status("Failed to create link to %s: %s",
243 module_file_path.GetPath().c_str(), error.AsCString());
245 auto cached_module_spec(module_spec);
246 cached_module_spec.GetUUID().Clear(); // Clear UUID since it may contain md5
247 // content hash instead of real UUID.
248 cached_module_spec.GetFileSpec() = module_file_path;
249 cached_module_spec.GetPlatformFileSpec() = module_spec.GetFileSpec();
251 error = ModuleList::GetSharedModule(cached_module_spec, cached_module_sp,
252 nullptr, nullptr, did_create_ptr, false);
256 FileSpec symfile_spec = GetSymbolFileSpec(cached_module_sp->GetFileSpec());
257 if (FileSystem::Instance().Exists(symfile_spec))
258 cached_module_sp->SetSymbolFileFileSpec(symfile_spec);
260 m_loaded_modules.insert(
261 std::make_pair(module_spec.GetUUID().GetAsString(), cached_module_sp));
266 Status ModuleCache::GetAndPut(const FileSpec &root_dir_spec,
267 const char *hostname,
268 const ModuleSpec &module_spec,
269 const ModuleDownloader &module_downloader,
270 const SymfileDownloader &symfile_downloader,
271 lldb::ModuleSP &cached_module_sp,
272 bool *did_create_ptr) {
273 const auto module_spec_dir =
274 GetModuleDirectory(root_dir_spec, module_spec.GetUUID());
275 auto error = MakeDirectory(module_spec_dir);
279 ModuleLock lock(root_dir_spec, module_spec.GetUUID(), error);
281 return Status("Failed to lock module %s: %s",
282 module_spec.GetUUID().GetAsString().c_str(),
285 const auto escaped_hostname(GetEscapedHostname(hostname));
286 // Check local cache for a module.
287 error = Get(root_dir_spec, escaped_hostname.c_str(), module_spec,
288 cached_module_sp, did_create_ptr);
292 const auto tmp_download_file_spec = JoinPath(module_spec_dir, kTempFileName);
293 error = module_downloader(module_spec, tmp_download_file_spec);
294 llvm::FileRemover tmp_file_remover(tmp_download_file_spec.GetPath());
296 return Status("Failed to download module: %s", error.AsCString());
298 // Put downloaded file into local module cache.
299 error = Put(root_dir_spec, escaped_hostname.c_str(), module_spec,
300 tmp_download_file_spec, module_spec.GetFileSpec());
302 return Status("Failed to put module into cache: %s", error.AsCString());
304 tmp_file_remover.releaseFile();
305 error = Get(root_dir_spec, escaped_hostname.c_str(), module_spec,
306 cached_module_sp, did_create_ptr);
310 // Fetching a symbol file for the module
311 const auto tmp_download_sym_file_spec =
312 JoinPath(module_spec_dir, kTempSymFileName);
313 error = symfile_downloader(cached_module_sp, tmp_download_sym_file_spec);
314 llvm::FileRemover tmp_symfile_remover(tmp_download_sym_file_spec.GetPath());
316 // Failed to download a symfile but fetching the module was successful. The
317 // module might contain the necessary symbols and the debugging is also
318 // possible without a symfile.
321 error = Put(root_dir_spec, escaped_hostname.c_str(), module_spec,
322 tmp_download_sym_file_spec,
323 GetSymbolFileSpec(module_spec.GetFileSpec()));
325 return Status("Failed to put symbol file into cache: %s",
328 tmp_symfile_remover.releaseFile();
330 FileSpec symfile_spec = GetSymbolFileSpec(cached_module_sp->GetFileSpec());
331 cached_module_sp->SetSymbolFileFileSpec(symfile_spec);