#ifndef LLVM_SUPPORT_ENDIAN_H
#define LLVM_SUPPORT_ENDIAN_H
+#include "llvm/Support/AlignOf.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/SwapByteOrder.h"
-#include "llvm/Support/type_traits.h"
namespace llvm {
namespace support {
+enum endianness {big, little, native};
-enum endianness {big, little};
-enum alignment {unaligned, aligned};
+// These are named values for common alignments.
+enum {aligned = 0, unaligned = 1};
namespace detail {
-
-template<typename value_type, alignment align>
-struct alignment_access_helper;
-
-template<typename value_type>
-struct alignment_access_helper<value_type, aligned>
-{
- value_type val;
-};
-
-// Provides unaligned loads and stores.
-#pragma pack(push)
-#pragma pack(1)
-template<typename value_type>
-struct alignment_access_helper<value_type, unaligned>
-{
- value_type val;
-};
-#pragma pack(pop)
-
+ /// \brief ::value is either alignment, or alignof(T) if alignment is 0.
+ template<class T, int alignment>
+ struct PickAlignment {
+ enum {value = alignment == 0 ? AlignOf<T>::Alignment : alignment};
+ };
} // end namespace detail
namespace endian {
- template<typename value_type, alignment align>
- inline value_type read_le(const void *memory) {
- value_type t =
- reinterpret_cast<const detail::alignment_access_helper
- <value_type, align> *>(memory)->val;
- if (sys::isBigEndianHost())
- return sys::SwapByteOrder(t);
- return t;
- }
+/// Swap the bytes of value to match the given endianness.
+template<typename value_type, endianness endian>
+inline value_type byte_swap(value_type value) {
+ if (endian != native && sys::IsBigEndianHost != (endian == big))
+ sys::swapByteOrder(value);
+ return value;
+}
- template<typename value_type, alignment align>
- inline void write_le(void *memory, value_type value) {
- if (sys::isBigEndianHost())
- value = sys::SwapByteOrder(value);
- reinterpret_cast<detail::alignment_access_helper<value_type, align> *>
- (memory)->val = value;
- }
+/// Read a value of a particular endianness from memory.
+template<typename value_type,
+ endianness endian,
+ std::size_t alignment>
+inline value_type read(const void *memory) {
+ value_type ret;
+
+ memcpy(&ret,
+ LLVM_ASSUME_ALIGNED(memory,
+ (detail::PickAlignment<value_type, alignment>::value)),
+ sizeof(value_type));
+ return byte_swap<value_type, endian>(ret);
+}
- template<typename value_type, alignment align>
- inline value_type read_be(const void *memory) {
- value_type t =
- reinterpret_cast<const detail::alignment_access_helper
- <value_type, align> *>(memory)->val;
- if (sys::isLittleEndianHost())
- return sys::SwapByteOrder(t);
- return t;
- }
+/// Read a value of a particular endianness from a buffer, and increment the
+/// buffer past that value.
+template<typename value_type, endianness endian, std::size_t alignment,
+ typename CharT>
+inline value_type readNext(const CharT *&memory) {
+ value_type ret = read<value_type, endian, alignment>(memory);
+ memory += sizeof(value_type);
+ return ret;
+}
- template<typename value_type, alignment align>
- inline void write_be(void *memory, value_type value) {
- if (sys::isLittleEndianHost())
- value = sys::SwapByteOrder(value);
- reinterpret_cast<detail::alignment_access_helper<value_type, align> *>
- (memory)->val = value;
- }
+/// Write a value to memory with a particular endianness.
+template<typename value_type,
+ endianness endian,
+ std::size_t alignment>
+inline void write(void *memory, value_type value) {
+ value = byte_swap<value_type, endian>(value);
+ memcpy(LLVM_ASSUME_ALIGNED(memory,
+ (detail::PickAlignment<value_type, alignment>::value)),
+ &value,
+ sizeof(value_type));
}
+} // end namespace endian
namespace detail {
-
template<typename value_type,
endianness endian,
- alignment align>
-class packed_endian_specific_integral;
-
-template<typename value_type>
-class packed_endian_specific_integral<value_type, little, unaligned> {
-public:
+ std::size_t alignment>
+struct packed_endian_specific_integral {
operator value_type() const {
- return endian::read_le<value_type, unaligned>(Value);
+ return endian::read<value_type, endian, alignment>(
+ (const void*)Value.buffer);
}
+
void operator=(value_type newValue) {
- endian::write_le<value_type, unaligned>((void *)&Value, newValue);
+ endian::write<value_type, endian, alignment>(
+ (void*)Value.buffer, newValue);
}
-private:
- uint8_t Value[sizeof(value_type)];
-};
-template<typename value_type>
-class packed_endian_specific_integral<value_type, big, unaligned> {
-public:
- operator value_type() const {
- return endian::read_be<value_type, unaligned>(Value);
+ packed_endian_specific_integral &operator+=(value_type newValue) {
+ *this = *this + newValue;
+ return *this;
}
- void operator=(value_type newValue) {
- endian::write_be<value_type, unaligned>((void *)&Value, newValue);
+
+ packed_endian_specific_integral &operator-=(value_type newValue) {
+ *this = *this - newValue;
+ return *this;
}
-private:
- uint8_t Value[sizeof(value_type)];
-};
-template<typename value_type>
-class packed_endian_specific_integral<value_type, little, aligned> {
-public:
- operator value_type() const {
- return endian::read_le<value_type, aligned>(&Value);
+ packed_endian_specific_integral &operator|=(value_type newValue) {
+ *this = *this | newValue;
+ return *this;
}
- void operator=(value_type newValue) {
- endian::write_le<value_type, aligned>((void *)&Value, newValue);
+
+ packed_endian_specific_integral &operator&=(value_type newValue) {
+ *this = *this & newValue;
+ return *this;
}
+
private:
- value_type Value;
-};
+ AlignedCharArray<PickAlignment<value_type, alignment>::value,
+ sizeof(value_type)> Value;
-template<typename value_type>
-class packed_endian_specific_integral<value_type, big, aligned> {
public:
- operator value_type() const {
- return endian::read_be<value_type, aligned>(&Value);
- }
- void operator=(value_type newValue) {
- endian::write_be<value_type, aligned>((void *)&Value, newValue);
- }
-private:
- value_type Value;
+ struct ref {
+ explicit ref(void *Ptr) : Ptr(Ptr) {}
+
+ operator value_type() const {
+ return endian::read<value_type, endian, alignment>(Ptr);
+ }
+
+ void operator=(value_type NewValue) {
+ endian::write<value_type, endian, alignment>(Ptr, NewValue);
+ }
+
+ private:
+ void *Ptr;
+ };
};
} // end namespace detail
-typedef detail::packed_endian_specific_integral
- <uint8_t, little, unaligned> ulittle8_t;
typedef detail::packed_endian_specific_integral
<uint16_t, little, unaligned> ulittle16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<uint64_t, little, unaligned> ulittle64_t;
-typedef detail::packed_endian_specific_integral
- <int8_t, little, unaligned> little8_t;
typedef detail::packed_endian_specific_integral
<int16_t, little, unaligned> little16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<int64_t, little, unaligned> little64_t;
-typedef detail::packed_endian_specific_integral
- <uint8_t, little, aligned> aligned_ulittle8_t;
typedef detail::packed_endian_specific_integral
<uint16_t, little, aligned> aligned_ulittle16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<uint64_t, little, aligned> aligned_ulittle64_t;
-typedef detail::packed_endian_specific_integral
- <int8_t, little, aligned> aligned_little8_t;
typedef detail::packed_endian_specific_integral
<int16_t, little, aligned> aligned_little16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<int64_t, little, aligned> aligned_little64_t;
-typedef detail::packed_endian_specific_integral
- <uint8_t, big, unaligned> ubig8_t;
typedef detail::packed_endian_specific_integral
<uint16_t, big, unaligned> ubig16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<uint64_t, big, unaligned> ubig64_t;
-typedef detail::packed_endian_specific_integral
- <int8_t, big, unaligned> big8_t;
typedef detail::packed_endian_specific_integral
<int16_t, big, unaligned> big16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<int64_t, big, unaligned> big64_t;
-typedef detail::packed_endian_specific_integral
- <uint8_t, big, aligned> aligned_ubig8_t;
typedef detail::packed_endian_specific_integral
<uint16_t, big, aligned> aligned_ubig16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<uint64_t, big, aligned> aligned_ubig64_t;
-typedef detail::packed_endian_specific_integral
- <int8_t, big, aligned> aligned_big8_t;
typedef detail::packed_endian_specific_integral
<int16_t, big, aligned> aligned_big16_t;
typedef detail::packed_endian_specific_integral
typedef detail::packed_endian_specific_integral
<int64_t, big, aligned> aligned_big64_t;
-} // end namespace llvm
+typedef detail::packed_endian_specific_integral
+ <uint16_t, native, unaligned> unaligned_uint16_t;
+typedef detail::packed_endian_specific_integral
+ <uint32_t, native, unaligned> unaligned_uint32_t;
+typedef detail::packed_endian_specific_integral
+ <uint64_t, native, unaligned> unaligned_uint64_t;
+
+typedef detail::packed_endian_specific_integral
+ <int16_t, native, unaligned> unaligned_int16_t;
+typedef detail::packed_endian_specific_integral
+ <int32_t, native, unaligned> unaligned_int32_t;
+typedef detail::packed_endian_specific_integral
+ <int64_t, native, unaligned> unaligned_int64_t;
+
+namespace endian {
+inline uint16_t read16le(const void *p) { return *(const ulittle16_t *)p; }
+inline uint32_t read32le(const void *p) { return *(const ulittle32_t *)p; }
+inline uint64_t read64le(const void *p) { return *(const ulittle64_t *)p; }
+inline uint16_t read16be(const void *p) { return *(const ubig16_t *)p; }
+inline uint32_t read32be(const void *p) { return *(const ubig32_t *)p; }
+inline uint64_t read64be(const void *p) { return *(const ubig64_t *)p; }
+
+inline void write16le(void *p, uint16_t v) { *(ulittle16_t *)p = v; }
+inline void write32le(void *p, uint32_t v) { *(ulittle32_t *)p = v; }
+inline void write64le(void *p, uint64_t v) { *(ulittle64_t *)p = v; }
+inline void write16be(void *p, uint16_t v) { *(ubig16_t *)p = v; }
+inline void write32be(void *p, uint32_t v) { *(ubig32_t *)p = v; }
+inline void write64be(void *p, uint64_t v) { *(ubig64_t *)p = v; }
+} // end namespace endian
} // end namespace support
+} // end namespace llvm
#endif
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