Move most of runtime/base to libartbase/base

Enforce the layering that code in runtime/base should not depend on
runtime by separating it into libartbase.  Some of the code in
runtime/base depends on the Runtime class, so it cannot be moved yet.
Also, some of the tests depend on CommonRuntimeTest, which itself needs
to be factored (in a subsequent CL).

Bug: 22322814
Test: make -j 50 checkbuild
      make -j 50 test-art-host

Change-Id: I8b096c1e2542f829eb456b4b057c71421b77d7e2
Merged-In: c431b9dc4b23cc950eb313695258df5d89f53b22

(cherry picked from commit c431b9dc4b23cc950eb313695258df5d89f53b22)

1 files changed, 63 insertions, 0 deletions

diff --git a/libartbase/base/os.h b/libartbase/base/os.h
new file mode 100644
index 0000000000..4062d90f88
--- /dev/null
+++ b/libartbase/base/os.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_LIBARTBASE_BASE_OS_H_
+#define ART_LIBARTBASE_BASE_OS_H_
+
+#include <stdint.h>
+
+namespace unix_file {
+class FdFile;
+}  // namespace unix_file
+
+namespace art {
+
+typedef ::unix_file::FdFile File;
+
+// Interface to the underlying OS platform.
+
+class OS {
+ public:
+  // Open an existing file with read only access.
+  static File* OpenFileForReading(const char* name);
+
+  // Open an existing file with read/write access.
+  static File* OpenFileReadWrite(const char* name);
+
+  // Create an empty file with read/write access. This is a *new* file, that is, if the file
+  // already exists, it is *not* overwritten, but unlinked, and a new inode will be used.
+  static File* CreateEmptyFile(const char* name);
+
+  // Create an empty file with write access. This is a *new* file, that is, if the file
+  // already exists, it is *not* overwritten, but unlinked, and a new inode will be used.
+  static File* CreateEmptyFileWriteOnly(const char* name);
+
+  // Open a file with the specified open(2) flags.
+  static File* OpenFileWithFlags(const char* name, int flags, bool auto_flush = true);
+
+  // Check if a file exists.
+  static bool FileExists(const char* name, bool check_file_type = true);
+
+  // Check if a directory exists.
+  static bool DirectoryExists(const char* name);
+
+  // Get the size of a file (or -1 if it does not exist).
+  static int64_t GetFileSizeBytes(const char* name);
+};
+
+}  // namespace art
+
+#endif  // ART_LIBARTBASE_BASE_OS_H_