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229 lines
7.8 KiB
C++
229 lines
7.8 KiB
C++
//===- Endian.h - Utilities for IO with endian specific data ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares generic functions to read and write endian specific data.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ENDIAN_H
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#define LLVM_SUPPORT_ENDIAN_H
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#include "llvm/Config/config.h"
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#include "llvm/System/SwapByteOrder.h"
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#include "llvm/Support/type_traits.h"
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namespace llvm {
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namespace support {
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enum endianness {big, little};
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enum alignment {unaligned, aligned};
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template<typename value_type, int host, int target>
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static typename enable_if_c<host == target, value_type>::type
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SwapByteOrderIfDifferent(value_type value) {
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// Target endianess is the same as the host. Just pass the value through.
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return value;
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}
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template<typename value_type, int host, int target>
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static typename enable_if_c<host != target, value_type>::type
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SwapByteOrderIfDifferent(value_type value) {
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return sys::SwapByteOrder<value_type>(value);
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}
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namespace detail {
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template<typename value_type, alignment align>
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struct alignment_access_helper;
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template<typename value_type>
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struct alignment_access_helper<value_type, aligned>
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{
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value_type val;
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};
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// Provides unaligned loads and stores.
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#pragma pack(push)
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#pragma pack(1)
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template<typename value_type>
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struct alignment_access_helper<value_type, unaligned>
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{
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value_type val;
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};
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#pragma pack(pop)
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} // end namespace detail
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#if defined(LLVM_IS_HOST_BIG_ENDIAN) \
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|| defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN__)
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static const endianness host_endianness = big;
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#else
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static const endianness host_endianness = little;
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#endif
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struct endian {
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template<typename value_type, alignment align>
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static value_type read_le(const void *memory) {
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return SwapByteOrderIfDifferent<value_type, host_endianness, little>(
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reinterpret_cast<const detail::alignment_access_helper
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<value_type, align> *>(memory)->val);
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}
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template<typename value_type, alignment align>
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static void write_le(void *memory, value_type value) {
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reinterpret_cast<detail::alignment_access_helper<value_type, align> *>
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(memory)->val =
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SwapByteOrderIfDifferent< value_type
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, host_endianness
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, little>(value);
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}
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template<typename value_type, alignment align>
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static value_type read_be(const void *memory) {
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return SwapByteOrderIfDifferent<value_type, host_endianness, big>(
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reinterpret_cast<const detail::alignment_access_helper
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<value_type, align> *>(memory)->val);
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}
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template<typename value_type, alignment align>
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static void write_be(void *memory, value_type value) {
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reinterpret_cast<detail::alignment_access_helper
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<value_type, align> *>(memory)->val =
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SwapByteOrderIfDifferent< value_type
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, host_endianness
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, big>(value);
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}
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};
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namespace detail {
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template<typename value_type,
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endianness target_endianness,
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alignment target_alignment>
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class packed_endian_specific_integral;
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template<typename value_type>
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class packed_endian_specific_integral<value_type, little, unaligned> {
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public:
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operator value_type() const {
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return endian::read_le<value_type, unaligned>(Value);
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}
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private:
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uint8_t Value[sizeof(value_type)];
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};
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template<typename value_type>
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class packed_endian_specific_integral<value_type, big, unaligned> {
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public:
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operator value_type() const {
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return endian::read_be<value_type, unaligned>(Value);
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}
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private:
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uint8_t Value[sizeof(value_type)];
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};
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template<typename value_type>
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class packed_endian_specific_integral<value_type, little, aligned> {
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public:
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operator value_type() const {
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return endian::read_le<value_type, aligned>(&Value);
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}
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private:
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value_type Value;
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};
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template<typename value_type>
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class packed_endian_specific_integral<value_type, big, aligned> {
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public:
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operator value_type() const {
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return endian::read_be<value_type, aligned>(&Value);
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}
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private:
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value_type Value;
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};
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} // end namespace detail
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typedef detail::packed_endian_specific_integral
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<uint8_t, little, unaligned> ulittle8_t;
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typedef detail::packed_endian_specific_integral
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<uint16_t, little, unaligned> ulittle16_t;
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typedef detail::packed_endian_specific_integral
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<uint32_t, little, unaligned> ulittle32_t;
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typedef detail::packed_endian_specific_integral
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<uint64_t, little, unaligned> ulittle64_t;
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typedef detail::packed_endian_specific_integral
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<int8_t, little, unaligned> little8_t;
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typedef detail::packed_endian_specific_integral
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<int16_t, little, unaligned> little16_t;
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typedef detail::packed_endian_specific_integral
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<int32_t, little, unaligned> little32_t;
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typedef detail::packed_endian_specific_integral
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<int64_t, little, unaligned> little64_t;
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typedef detail::packed_endian_specific_integral
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<uint8_t, little, aligned> aligned_ulittle8_t;
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typedef detail::packed_endian_specific_integral
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<uint16_t, little, aligned> aligned_ulittle16_t;
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typedef detail::packed_endian_specific_integral
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<uint32_t, little, aligned> aligned_ulittle32_t;
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typedef detail::packed_endian_specific_integral
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<uint64_t, little, aligned> aligned_ulittle64_t;
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typedef detail::packed_endian_specific_integral
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<int8_t, little, aligned> aligned_little8_t;
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typedef detail::packed_endian_specific_integral
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<int16_t, little, aligned> aligned_little16_t;
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typedef detail::packed_endian_specific_integral
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<int32_t, little, aligned> aligned_little32_t;
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typedef detail::packed_endian_specific_integral
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<int64_t, little, aligned> aligned_little64_t;
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typedef detail::packed_endian_specific_integral
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<uint8_t, big, unaligned> ubig8_t;
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typedef detail::packed_endian_specific_integral
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<uint16_t, big, unaligned> ubig16_t;
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typedef detail::packed_endian_specific_integral
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<uint32_t, big, unaligned> ubig32_t;
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typedef detail::packed_endian_specific_integral
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<uint64_t, big, unaligned> ubig64_t;
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typedef detail::packed_endian_specific_integral
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<int8_t, big, unaligned> big8_t;
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typedef detail::packed_endian_specific_integral
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<int16_t, big, unaligned> big16_t;
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typedef detail::packed_endian_specific_integral
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<int32_t, big, unaligned> big32_t;
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typedef detail::packed_endian_specific_integral
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<int64_t, big, unaligned> big64_t;
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typedef detail::packed_endian_specific_integral
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<uint8_t, big, aligned> aligned_ubig8_t;
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typedef detail::packed_endian_specific_integral
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<uint16_t, big, aligned> aligned_ubig16_t;
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typedef detail::packed_endian_specific_integral
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<uint32_t, big, aligned> aligned_ubig32_t;
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typedef detail::packed_endian_specific_integral
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<uint64_t, big, aligned> aligned_ubig64_t;
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typedef detail::packed_endian_specific_integral
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<int8_t, big, aligned> aligned_big8_t;
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typedef detail::packed_endian_specific_integral
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<int16_t, big, aligned> aligned_big16_t;
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typedef detail::packed_endian_specific_integral
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<int32_t, big, aligned> aligned_big32_t;
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typedef detail::packed_endian_specific_integral
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<int64_t, big, aligned> aligned_big64_t;
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} // end namespace llvm
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} // end namespace support
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#endif
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