Update prebuilt Clang to r353983e.HEADq10.0

clang 9.0.5 (based on r353983e) from build 5696680.

Bug: http://b/135931688
Bug: http://b/136008926
Test: N/A
Change-Id: I922d17410047d2e2df4625615352c588ee71b203

1 files changed, 50 insertions, 0 deletions

diff --git a/clang-r353983e/include/clang/Rewrite/Core/DeltaTree.h b/clang-r353983e/include/clang/Rewrite/Core/DeltaTree.h
new file mode 100644
index 00000000..e566c92a
--- /dev/null
+++ b/clang-r353983e/include/clang/Rewrite/Core/DeltaTree.h
@@ -0,0 +1,50 @@
+//===- DeltaTree.h - B-Tree for Rewrite Delta tracking ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the DeltaTree class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_REWRITE_CORE_DELTATREE_H
+#define LLVM_CLANG_REWRITE_CORE_DELTATREE_H
+
+namespace clang {
+
+  /// DeltaTree - a multiway search tree (BTree) structure with some fancy
+  /// features.  B-Trees are generally more memory and cache efficient than
+  /// binary trees, because they store multiple keys/values in each node.  This
+  /// implements a key/value mapping from index to delta, and allows fast lookup
+  /// on index.  However, an added (important) bonus is that it can also
+  /// efficiently tell us the full accumulated delta for a specific file offset
+  /// as well, without traversing the whole tree.
+  class DeltaTree {
+    void *Root;    // "DeltaTreeNode *"
+
+  public:
+    DeltaTree();
+
+    // Note: Currently we only support copying when the RHS is empty.
+    DeltaTree(const DeltaTree &RHS);
+
+    DeltaTree &operator=(const DeltaTree &) = delete;
+    ~DeltaTree();
+
+    /// getDeltaAt - Return the accumulated delta at the specified file offset.
+    /// This includes all insertions or delections that occurred *before* the
+    /// specified file index.
+    int getDeltaAt(unsigned FileIndex) const;
+
+    /// AddDelta - When a change is made that shifts around the text buffer,
+    /// this method is used to record that info.  It inserts a delta of 'Delta'
+    /// into the current DeltaTree at offset FileIndex.
+    void AddDelta(unsigned FileIndex, int Delta);
+  };
+
+} // namespace clang
+
+#endif // LLVM_CLANG_REWRITE_CORE_DELTATREE_H