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diff --git a/qemu/disas/libvixl/vixl/code-buffer.h b/qemu/disas/libvixl/vixl/code-buffer.h
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+++ b/qemu/disas/libvixl/vixl/code-buffer.h
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+// Copyright 2014, ARM Limited
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//   * Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//   * Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//   * Neither the name of ARM Limited nor the names of its contributors may be
+//     used to endorse or promote products derived from this software without
+//     specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef VIXL_CODE_BUFFER_H
+#define VIXL_CODE_BUFFER_H
+
+#include <string.h>
+#include "vixl/globals.h"
+
+namespace vixl {
+
+class CodeBuffer {
+ public:
+  explicit CodeBuffer(size_t capacity = 4 * KBytes);
+  CodeBuffer(void* buffer, size_t capacity);
+  ~CodeBuffer();
+
+  void Reset();
+
+  ptrdiff_t OffsetFrom(ptrdiff_t offset) const {
+    ptrdiff_t cursor_offset = cursor_ - buffer_;
+    VIXL_ASSERT((offset >= 0) && (offset <= cursor_offset));
+    return cursor_offset - offset;
+  }
+
+  ptrdiff_t CursorOffset() const {
+    return OffsetFrom(0);
+  }
+
+  template <typename T>
+  T GetOffsetAddress(ptrdiff_t offset) const {
+    VIXL_ASSERT((offset >= 0) && (offset <= (cursor_ - buffer_)));
+    return reinterpret_cast<T>(buffer_ + offset);
+  }
+
+  size_t RemainingBytes() const {
+    VIXL_ASSERT((cursor_ >= buffer_) && (cursor_ <= (buffer_ + capacity_)));
+    return (buffer_ + capacity_) - cursor_;
+  }
+
+  // A code buffer can emit:
+  //  * 32-bit data: instruction and constant.
+  //  * 64-bit data: constant.
+  //  * string: debug info.
+  void Emit32(uint32_t data) { Emit(data); }
+
+  void Emit64(uint64_t data) { Emit(data); }
+
+  void EmitString(const char* string);
+
+  // Align to kInstructionSize.
+  void Align();
+
+  size_t capacity() const { return capacity_; }
+
+  bool IsManaged() const { return managed_; }
+
+  void Grow(size_t new_capacity);
+
+  bool IsDirty() const { return dirty_; }
+
+  void SetClean() { dirty_ = false; }
+
+ private:
+  template <typename T>
+  void Emit(T value) {
+    VIXL_ASSERT(RemainingBytes() >= sizeof(value));
+    dirty_ = true;
+    memcpy(cursor_, &value, sizeof(value));
+    cursor_ += sizeof(value);
+  }
+
+  // Backing store of the buffer.
+  byte* buffer_;
+  // If true the backing store is allocated and deallocated by the buffer. The
+  // backing store can then grow on demand. If false the backing store is
+  // provided by the user and cannot be resized internally.
+  bool managed_;
+  // Pointer to the next location to be written.
+  byte* cursor_;
+  // True if there has been any write since the buffer was created or cleaned.
+  bool dirty_;
+  // Capacity in bytes of the backing store.
+  size_t capacity_;
+};
+
+}  // namespace vixl
+
+#endif  // VIXL_CODE_BUFFER_H
+