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, 75 insertions, 0 deletions

diff --git a/libartbase/base/bounded_fifo.h b/libartbase/base/bounded_fifo.h
new file mode 100644
index 0000000000..444f31a55b
--- /dev/null
+++ b/libartbase/base/bounded_fifo.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2013 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_BOUNDED_FIFO_H_
+#define ART_LIBARTBASE_BASE_BOUNDED_FIFO_H_
+
+#include <android-base/logging.h>
+
+#include "base/bit_utils.h"
+
+namespace art {
+
+// A bounded fifo is a fifo which has a bounded size. The power of two version uses a bit mask to
+// avoid needing to deal with wrapping integers around or using a modulo operation.
+template <typename T, const size_t kMaxSize>
+class BoundedFifoPowerOfTwo {
+  static_assert(IsPowerOfTwo(kMaxSize), "kMaxSize must be a power of 2.");
+
+ public:
+  BoundedFifoPowerOfTwo() {
+    clear();
+  }
+
+  void clear() {
+    back_index_ = 0;
+    size_ = 0;
+  }
+
+  bool empty() const {
+    return size() == 0;
+  }
+
+  size_t size() const {
+    return size_;
+  }
+
+  void push_back(const T& value) {
+    ++size_;
+    DCHECK_LE(size_, kMaxSize);
+    // Relies on integer overflow behavior.
+    data_[back_index_++ & mask_] = value;
+  }
+
+  const T& front() const {
+    DCHECK_GT(size_, 0U);
+    return data_[(back_index_ - size_) & mask_];
+  }
+
+  void pop_front() {
+    DCHECK_GT(size_, 0U);
+    --size_;
+  }
+
+ private:
+  static const size_t mask_ = kMaxSize - 1;
+  size_t back_index_, size_;
+  T data_[kMaxSize];
+};
+
+}  // namespace art
+
+#endif  // ART_LIBARTBASE_BASE_BOUNDED_FIFO_H_