1 files changed, 78 insertions, 0 deletions
diff --git a/source/Utility/ModuleCache.h b/source/Utility/ModuleCache.h
new file mode 100644
index 000000000000..791e2b35ae3d
--- /dev/null
+++ b/source/Utility/ModuleCache.h
@@ -0,0 +1,78 @@
+//===-- ModuleCache.h -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef utility_ModuleCache_h_
+#define utility_ModuleCache_h_
+
+#include "lldb/lldb-types.h"
+#include "lldb/lldb-forward.h"
+
+#include "lldb/Core/Error.h"
+#include "lldb/Host/File.h"
+#include "lldb/Host/FileSpec.h"
+
+#include <functional>
+#include <string>
+#include <unordered_map>
+
+namespace lldb_private {
+
+class Module;
+class UUID;
+
+//----------------------------------------------------------------------
+/// @class ModuleCache ModuleCache.h "Utility/ModuleCache.h"
+/// @brief A module cache class.
+///
+/// Caches locally modules that are downloaded from remote targets.
+/// Each cached module maintains 2 views:
+///  - UUID view:    /${CACHE_ROOT}/${PLATFORM_NAME}/.cache/${UUID}/${MODULE_FILENAME}
+///  - Sysroot view: /${CACHE_ROOT}/${PLATFORM_NAME}/${HOSTNAME}/${MODULE_FULL_FILEPATH}
+///
+/// UUID views stores a real module file, whereas Sysroot view holds a symbolic
+/// link to UUID-view file.
+///
+/// Example:
+/// UUID view   : /tmp/lldb/remote-linux/.cache/30C94DC6-6A1F-E951-80C3-D68D2B89E576-D5AE213C/libc.so.6
+/// Sysroot view: /tmp/lldb/remote-linux/ubuntu/lib/x86_64-linux-gnu/libc.so.6
+//----------------------------------------------------------------------
+
+class ModuleCache
+{
+public:
+    using Downloader = std::function<Error (const ModuleSpec&, const FileSpec&)>;
+
+    Error
+    GetAndPut(const FileSpec &root_dir_spec,
+              const char *hostname,
+              const ModuleSpec &module_spec,
+              const Downloader &downloader,
+              lldb::ModuleSP &cached_module_sp,
+              bool *did_create_ptr);
+
+private:
+    Error
+    Put (const FileSpec &root_dir_spec,
+         const char *hostname,
+         const ModuleSpec &module_spec,
+         const FileSpec &tmp_file);
+
+    Error
+    Get (const FileSpec &root_dir_spec,
+         const char *hostname,
+         const ModuleSpec &module_spec,
+         lldb::ModuleSP &cached_module_sp,
+         bool *did_create_ptr);
+
+    std::unordered_map<std::string, lldb::ModuleWP> m_loaded_modules;
+};
+
+} // namespace lldb_private
+
+#endif  // utility_ModuleCache_h_