Implement MojoGetBufferInformation(), part 1.

mojo/edk/system/memory.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/memory.h"
 
 #include <limits>
 
 #include "base/logging.h"
 
 namespace mojo {
 namespace system {
 namespace internal {
 
 template <size_t alignment>
 bool IsAligned(const void* pointer) {
   return reinterpret_cast<uintptr_t>(pointer) % alignment == 0;
 }
 
 template <size_t size, size_t alignment>
 void CheckUserPointer(const void* pointer) {
   CHECK(pointer && IsAligned<alignment>(pointer));
 }
 
 // Explicitly instantiate the sizes we need. Add instantiations as needed.
 template void CheckUserPointer<1, 1>(const void*);
 template void CheckUserPointer<4, 4>(const void*);
 template void CheckUserPointer<8, 4>(const void*);
 template void CheckUserPointer<8, 8>(const void*);
+template void CheckUserPointer<16, 8>(const void*);
 
 template <size_t size, size_t alignment>
 void CheckUserPointerWithCount(const void* pointer, size_t count) {
   CHECK_LE(count, std::numeric_limits<size_t>::max() / size);
   CHECK(count == 0 || (pointer && IsAligned<alignment>(pointer)));
 }
 
 // Explicitly instantiate the sizes we need. Add instantiations as needed.
 template void CheckUserPointerWithCount<1, 1>(const void*, size_t);
 template void CheckUserPointerWithCount<4, 4>(const void*, size_t);
 template void CheckUserPointerWithCount<8, 4>(const void*, size_t);
 template void CheckUserPointerWithCount<8, 8>(const void*, size_t);
 
 template <size_t alignment>
 void CheckUserPointerWithSize(const void* pointer, size_t size) {
   // TODO(vtl): If running in kernel mode, do a full verification. For now, just
   // check that it's non-null and aligned. (A faster user mode implementation is
   // also possible if this check is skipped.)
   CHECK(size == 0 || (!!pointer && internal::IsAligned<alignment>(pointer)));
 }
 
 // Explicitly instantiate the sizes we need. Add instantiations as needed.
 template void CheckUserPointerWithSize<1>(const void*, size_t);
 template void CheckUserPointerWithSize<4>(const void*, size_t);
 template void CheckUserPointerWithSize<8>(const void*, size_t);
 
 }  // namespace internal
 }  // namespace system
 }  // namespace mojo