CharacterDataBufferImpl.h (1387B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef mozilla_dom_CharacterDataBufferImpl_h 8 #define mozilla_dom_CharacterDataBufferImpl_h 9 10 #include <stdint.h> 11 12 template <size_t size> 13 struct Non8BitParameters; 14 template <> 15 struct Non8BitParameters<4> { 16 static inline size_t mask() { return 0xff00ff00; } 17 static inline uint32_t alignMask() { return 0x3; } 18 static inline uint32_t numUnicharsPerWord() { return 2; } 19 }; 20 21 template <> 22 struct Non8BitParameters<8> { 23 static inline size_t mask() { 24 static const uint64_t maskAsUint64 = 0xff00ff00ff00ff00ULL; 25 // We have to explicitly cast this 64-bit value to a size_t, or else 26 // compilers for 32-bit platforms will warn about it being too large to fit 27 // in the size_t return type. (Fortunately, this code isn't actually 28 // invoked on 32-bit platforms -- they'll use the <4> specialization above. 29 // So it is, in fact, OK that this value is too large for a 32-bit size_t.) 30 return (size_t)maskAsUint64; 31 } 32 static inline uint32_t alignMask() { return 0x7; } 33 static inline uint32_t numUnicharsPerWord() { return 4; } 34 }; 35 36 #endif