1 //===-- include/Support/DataTypes.h - Define fixed size types ----*- C++ -*--=//
3 // This file contains definitions to figure out the size of _HOST_ data types.
4 // This file is important because different host OS's define different macros,
5 // which makes portability tough. This file exports the following definitions:
7 // ENDIAN_LITTLE : is #define'd if the host is little endian
8 // int64_t : is a typedef for the signed 64 bit system type
9 // uint64_t : is a typedef for the unsigned 64 bit system type
10 // INT64_MAX : is a #define specifying the max value for int64_t's
12 // No library is required when using these functinons.
14 //===----------------------------------------------------------------------===//
16 // TODO: This file sucks. Not only does it not work, but this stuff should be
17 // autoconfiscated anyways. Major FIXME
19 #ifndef LLVM_SUPPORT_DATATYPES_H
20 #define LLVM_SUPPORT_DATATYPES_H
22 #define __STDC_LIMIT_MACROS 1
27 # if BYTE_ORDER == LITTLE_ENDIAN
35 # include <machine/endian.h>
36 # if _BYTE_ORDER == _LITTLE_ENDIAN
37 # ifndef LITTLE_ENDIAN
38 # define LITTLE_ENDIAN 1
54 # include <sys/types.h>
55 # ifdef _LITTLE_ENDIAN
56 # define LITTLE_ENDIAN 1
63 // Convert the information from the header files into our own local
64 // endian macros. We do this because various strange systems define both
65 // BIG_ENDIAN and LITTLE_ENDIAN, and we don't want to conflict with them.
67 // Don't worry; once we introduce autoconf, this will look a lot nicer.
77 #if (defined(ENDIAN_LITTLE) && defined(ENDIAN_BIG))
78 #error "Cannot define both ENDIAN_LITTLE and ENDIAN_BIG!"
81 #if (!defined(ENDIAN_LITTLE) && !defined(ENDIAN_BIG)) || !defined(INT64_MAX)
82 #error "include/Support/DataTypes.h could not determine endianness!"
85 #endif /* LLVM_SUPPORT_DATATYPES_H */