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Change PLATFORM_32/64BIT detection

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turns out that using UINTPTR_MAX is a pain on several systems like
FreeBSD or even older Linux/glibc systems, so maybe let's not do that
anymore.
Now I check for known CPU-architectures instead.

I also added some sanity checks to make sure the detection was
correct.
This commit is contained in:
Daniel Gibson 2016-04-19 16:47:26 +02:00
parent 83b3e2fee3
commit e642cbcd20
1 changed files with 35 additions and 28 deletions
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63
Sources/Engine/Base/Types.h
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@ -61,37 +61,44 @@ typedef unsigned int UINT;
#define PLATFORM_LITTLEENDIAN 1
#endif
#ifdef PLATFORM_WIN32
#ifdef _WIN64
#define PLATFORM_64BIT 1
#else
#define PLATFORM_32BIT 1
#endif
#if defined(__x86_64__) || defined(_M_X64) || defined(__aarch64__) || defined(_ARCH_PPC64) \
|| defined(_M_IA64) || defined(__IA64__)
#define PLATFORM_64BIT 1
#elif defined(__i386) || defined(_M_IX86) || defined(__arm__) || defined(_M_ARM) || defined(__POWERPC__) \
|| defined(_M_PPC) || defined(_ARCH_PPC)
#define PLATFORM_32BIT 1
#else
// AFAIK there were versions of MSVC where UINTPTR_MAX was incorrect,
// so I use different code for Windows above
#include <stdint.h> // UINTPTR_MAX
#ifdef UINTPTR_MAX
#if UINTPTR_MAX == 0xffffffffuL
#define PLATFORM_32BIT 1
#elif UINTPTR_MAX == 0xffffffffffffffffuLL
#define PLATFORM_64BIT 1
#else
#error WTF, your system seems to be neither 32bit nor 64bit?!
#endif
#else
#error Your system does not provide UINTPRT_MAX, find another way!
#endif
#if UINTPTR_MAX != SIZE_MAX
// the code uses size_t to store pointers all over the place, so if size_t and uintptr_t
// don't have the same size on your system, you're in real trouble.
// (before panicking however make sure your headers don't just contain bullshit values for UINTPTR_MAX or SIZE_MAX)
#error Seems like on your system sizeof(size_t) != sizeof(uintptr_t) - that is *very* bad.
#endif
#error "Unknown CPU-Architecture, adapt this code to detect 32/64bitness of your system!"
#endif
// if the compiler complains about the typedef created by MY_STATIC_ASSERT being invalid
// (because of array with negative size), it means the check for cond has failed
#define MY_STATIC_ASSERT(namesuffx, cond) \
typedef char sesam__check_ ## namesuffx [ (cond) ? 1 : -1 ];
// some sanity checks to make sure the PLATFORM_*BIT #defines match the pointer size
// and that size_t is the size of a pointer, as expected (as we sometimes use size_t to store pointers)
#ifdef PLATFORM_32BIT
MY_STATIC_ASSERT(32bit_PointerSize, sizeof(void*) == 4);
#ifdef PLATFORM_64BIT
#error "PLATFORM_32BIT and PLATFORM_64BIT must not be #defined at the same time!"
#endif
#endif
#ifdef PLATFORM_64BIT
MY_STATIC_ASSERT(64bit_PointerSize, sizeof(void*) == 8);
#endif
MY_STATIC_ASSERT(size_tSize, sizeof(size_t) == sizeof(void*));
#undef MY_STATIC_ASSERT
// Mac symbols have an underscore prepended...
#if PLATFORM_MACOSX
#define ASMSYM(x) "_" #x