text: /*
  ** LuaJIT common internal definitions.
  ** Copyright (C) 2005-2015 Mike Pall. See Copyright Notice in luajit.h
  */
  
  #ifndef _LJ_DEF_H
  #define _LJ_DEF_H
  
  #include "lua.h"
  
  #if defined(_MSC_VER)
  /* MSVC is stuck in the last century and doesn't have C99's stdint.h. */
  typedef signed __int8 int8_t;
  typedef signed __int16 int16_t;
  typedef signed __int32 int32_t;
  typedef signed __int64 int64_t;
  typedef unsigned __int8 uint8_t;
  typedef unsigned __int16 uint16_t;
  typedef unsigned __int32 uint32_t;
  typedef unsigned __int64 uint64_t;
  #ifdef _WIN64
  typedef __int64 intptr_t;
  typedef unsigned __int64 uintptr_t;
  #else
  typedef __int32 intptr_t;
  typedef unsigned __int32 uintptr_t;
  #endif
  #elif defined(__symbian__)
  /* Cough. */
  typedef signed char int8_t;
  typedef short int int16_t;
  typedef int int32_t;
  typedef long long int64_t;
  typedef unsigned char uint8_t;
  typedef unsigned short int uint16_t;
  typedef unsigned int uint32_t;
  typedef unsigned long long uint64_t;
  typedef int intptr_t;
  typedef unsigned int uintptr_t;
  #else
  #include <stdint.h>
  #endif
  
  /* Needed everywhere. */
  #include <string.h>
  #include <stdlib.h>
  
  /* Various VM limits. */
  #define LJ_MAX_MEM32	0x7fffff00	/* Max. 32 bit memory allocation. */
  #define LJ_MAX_MEM64	((uint64_t)1<<47)  /* Max. 64 bit memory allocation. */
  /* Max. total memory allocation. */
  #define LJ_MAX_MEM	(LJ_GC64 ? LJ_MAX_MEM64 : LJ_MAX_MEM32)
  #define LJ_MAX_ALLOC	LJ_MAX_MEM	/* Max. individual allocation length. */
  #define LJ_MAX_STR	LJ_MAX_MEM32	/* Max. string length. */
  #define LJ_MAX_BUF	LJ_MAX_MEM32	/* Max. buffer length. */
  #define LJ_MAX_UDATA	LJ_MAX_MEM32	/* Max. userdata length. */
  
  #define LJ_MAX_STRTAB	(1<<26)		/* Max. string table size. */
  #define LJ_MAX_HBITS	26		/* Max. hash bits. */
  #define LJ_MAX_ABITS	28		/* Max. bits of array key. */
  #define LJ_MAX_ASIZE	((1<<(LJ_MAX_ABITS-1))+1)  /* Max. array part size. */
  #define LJ_MAX_COLOSIZE	16		/* Max. elems for colocated array. */
  
  #define LJ_MAX_LINE	LJ_MAX_MEM32	/* Max. source code line number. */
  #define LJ_MAX_XLEVEL	200		/* Max. syntactic nesting level. */
  #define LJ_MAX_BCINS	(1<<26)		/* Max. # of bytecode instructions. */
  #define LJ_MAX_SLOTS	250		/* Max. # of slots in a Lua func. */
  #define LJ_MAX_LOCVAR	200		/* Max. # of local variables. */
  #define LJ_MAX_UPVAL	60		/* Max. # of upvalues. */
  
  #define LJ_MAX_IDXCHAIN	100		/* __index/__newindex chain limit. */
  #define LJ_STACK_EXTRA	(5+2*LJ_FR2)	/* Extra stack space (metamethods). */
  
  #define LJ_NUM_CBPAGE	1		/* Number of FFI callback pages. */
  
  /* Minimum table/buffer sizes. */
  #define LJ_MIN_GLOBAL	6		/* Min. global table size (hbits). */
  #define LJ_MIN_REGISTRY	2		/* Min. registry size (hbits). */
  #define LJ_MIN_STRTAB	256		/* Min. string table size (pow2). */
  #define LJ_MIN_SBUF	32		/* Min. string buffer length. */
  #define LJ_MIN_VECSZ	8		/* Min. size for growable vectors. */
  #define LJ_MIN_IRSZ	32		/* Min. size for growable IR. */
  #define LJ_MIN_K64SZ	16		/* Min. size for chained K64Array. */
  
  /* JIT compiler limits. */
  #define LJ_MAX_JSLOTS	250		/* Max. # of stack slots for a trace. */
  #define LJ_MAX_PHI	64		/* Max. # of PHIs for a loop. */
  #define LJ_MAX_EXITSTUBGR	16	/* Max. # of exit stub groups. */
  
  /* Various macros. */
  #ifndef UNUSED
  #define UNUSED(x)	((void)(x))	/* to avoid warnings */
  #endif
  
  #define U64x(hi, lo)	(((uint64_t)0x##hi << 32) + (uint64_t)0x##lo)
  #define i32ptr(p)	((int32_t)(intptr_t)(void *)(p))
  #define u32ptr(p)	((uint32_t)(intptr_t)(void *)(p))
  
  #define checki8(x)	((x) == (int32_t)(int8_t)(x))
  #define checku8(x)	((x) == (int32_t)(uint8_t)(x))
  #define checki16(x)	((x) == (int32_t)(int16_t)(x))
  #define checku16(x)	((x) == (int32_t)(uint16_t)(x))
  #define checki32(x)	((x) == (int32_t)(x))
  #define checku32(x)	((x) == (uint32_t)(x))
  #define checkptr32(x)	((uintptr_t)(x) == (uint32_t)(uintptr_t)(x))
  #define checkptr47(x)	(((uint64_t)(x) >> 47) == 0)
  #if LJ_GC64
  #define checkptrGC(x)	(checkptr47((x)))
  #elif LJ_64
  #define checkptrGC(x)	(checkptr32((x)))
  #else
  #define checkptrGC(x)	1
  #endif
  
  /* Every half-decent C compiler transforms this into a rotate instruction. */
  #define lj_rol(x, n)	(((x)<<(n)) | ((x)>>(-(int)(n)&(8*sizeof(x)-1))))
  #define lj_ror(x, n)	(((x)<<(-(int)(n)&(8*sizeof(x)-1))) | ((x)>>(n)))
  
  /* A really naive Bloom filter. But sufficient for our needs. */
  typedef uintptr_t BloomFilter;
  #define BLOOM_MASK	(8*sizeof(BloomFilter) - 1)
  #define bloombit(x)	((uintptr_t)1 << ((x) & BLOOM_MASK))
  #define bloomset(b, x)	((b) |= bloombit((x)))
  #define bloomtest(b, x)	((b) & bloombit((x)))
  
  #if defined(__GNUC__) || defined(__psp2__)
  
  #define LJ_NORET	__attribute__((noreturn))
  #define LJ_ALIGN(n)	__attribute__((aligned(n)))
  #define LJ_INLINE	inline
  #define LJ_AINLINE	inline __attribute__((always_inline))
  #define LJ_NOINLINE	__attribute__((noinline))
  
  #if defined(__ELF__) || defined(__MACH__) || defined(__psp2__)
  #if !((defined(__sun__) && defined(__svr4__)) || defined(__CELLOS_LV2__))
  #define LJ_NOAPI	extern __attribute__((visibility("hidden")))
  #endif
  #endif
  
  /* Note: it's only beneficial to use fastcall on x86 and then only for up to
  ** two non-FP args. The amalgamated compile covers all LJ_FUNC cases. Only
  ** indirect calls and related tail-called C functions are marked as fastcall.
  */
  #if defined(__i386__)
  #define LJ_FASTCALL	__attribute__((fastcall))
  #endif
  
  #define LJ_LIKELY(x)	__builtin_expect(!!(x), 1)
  #define LJ_UNLIKELY(x)	__builtin_expect(!!(x), 0)
  
  #define lj_ffs(x)	((uint32_t)__builtin_ctz(x))
  /* Don't ask ... */
  #if defined(__INTEL_COMPILER) && (defined(__i386__) || defined(__x86_64__))
  static LJ_AINLINE uint32_t lj_fls(uint32_t x)
  {
    uint32_t r; __asm__("bsrl %1, %0" : "=r" (r) : "rm" (x) : "cc"); return r;
  }
  #else
  #define lj_fls(x)	((uint32_t)(__builtin_clz(x)^31))
  #endif
  
  #if defined(__arm__)
  static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
  {
  #if defined(__psp2__)
    return __builtin_rev(x);
  #else
    uint32_t r;
  #if __ARM_ARCH_6__ || __ARM_ARCH_6J__ || __ARM_ARCH_6T2__ || __ARM_ARCH_6Z__ ||\
      __ARM_ARCH_6ZK__ || __ARM_ARCH_7__ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__
    __asm__("rev %0, %1" : "=r" (r) : "r" (x));
    return r;
  #else
  #ifdef __thumb__
    r = x ^ lj_ror(x, 16);
  #else
    __asm__("eor %0, %1, %1, ror #16" : "=r" (r) : "r" (x));
  #endif
    return ((r & 0xff00ffffu) >> 8) ^ lj_ror(x, 8);
  #endif
  #endif
  }
  
  static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
  {
    return ((uint64_t)lj_bswap((uint32_t)x)<<32) | lj_bswap((uint32_t)(x>>32));
  }
  #elif (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
  static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
  {
    return (uint32_t)__builtin_bswap32((int32_t)x);
  }
  
  static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
  {
    return (uint64_t)__builtin_bswap64((int64_t)x);
  }
  #elif defined(__i386__) || defined(__x86_64__)
  static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
  {
    uint32_t r; __asm__("bswap %0" : "=r" (r) : "0" (x)); return r;
  }
  
  #if defined(__i386__)
  static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
  {
    return ((uint64_t)lj_bswap((uint32_t)x)<<32) | lj_bswap((uint32_t)(x>>32));
  }
  #else
  static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
  {
    uint64_t r; __asm__("bswap %0" : "=r" (r) : "0" (x)); return r;
  }
  #endif
  #else
  static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
  {
    return (x << 24) | ((x & 0xff00) << 8) | ((x >> 8) & 0xff00) | (x >> 24);
  }
  
  static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
  {
    return (uint64_t)lj_bswap((uint32_t)(x >> 32)) |
  	 ((uint64_t)lj_bswap((uint32_t)x) << 32);
  }
  #endif
  
  typedef union __attribute__((packed)) Unaligned16 {
    uint16_t u;
    uint8_t b[2];
  } Unaligned16;
  
  typedef union __attribute__((packed)) Unaligned32 {
    uint32_t u;
    uint8_t b[4];
  } Unaligned32;
  
  /* Unaligned load of uint16_t. */
  static LJ_AINLINE uint16_t lj_getu16(const void *p)
  {
    return ((const Unaligned16 *)p)->u;
  }
  
  /* Unaligned load of uint32_t. */
  static LJ_AINLINE uint32_t lj_getu32(const void *p)
  {
    return ((const Unaligned32 *)p)->u;
  }
  
  #elif defined(_MSC_VER)
  
  #define LJ_NORET	__declspec(noreturn)
  #define LJ_ALIGN(n)	__declspec(align(n))
  #define LJ_INLINE	__inline
  #define LJ_AINLINE	__forceinline
  #define LJ_NOINLINE	__declspec(noinline)
  #if defined(_M_IX86)
  #define LJ_FASTCALL	__fastcall
  #endif
  
  #ifdef _M_PPC
  unsigned int _CountLeadingZeros(long);
  #pragma intrinsic(_CountLeadingZeros)
  static LJ_AINLINE uint32_t lj_fls(uint32_t x)
  {
    return _CountLeadingZeros(x) ^ 31;
  }
  #else
  unsigned char _BitScanForward(unsigned long *, unsigned long);
  unsigned char _BitScanReverse(unsigned long *, unsigned long);
  #pragma intrinsic(_BitScanForward)
  #pragma intrinsic(_BitScanReverse)
  
  static LJ_AINLINE uint32_t lj_ffs(uint32_t x)
  {
    uint32_t r; _BitScanForward((unsigned long*)&r, x); return r;
  }
  
  static LJ_AINLINE uint32_t lj_fls(uint32_t x)
  {
    uint32_t r; _BitScanReverse((unsigned long*)&r, x); return r;
  }
  #endif
  
  unsigned long _byteswap_ulong(unsigned long);
  uint64_t _byteswap_uint64(uint64_t);
  #define lj_bswap(x)	(_byteswap_ulong((x)))
  #define lj_bswap64(x)	(_byteswap_uint64((x)))
  
  #if defined(_M_PPC) && defined(LUAJIT_NO_UNALIGNED)
  /*
  ** Replacement for unaligned loads on Xbox 360. Disabled by default since it's
  ** usually more costly than the occasional stall when crossing a cache-line.
  */
  static LJ_AINLINE uint16_t lj_getu16(const void *v)
  {
    const uint8_t *p = (const uint8_t *)v;
    return (uint16_t)((p[0]<<8) | p[1]);
  }
  static LJ_AINLINE uint32_t lj_getu32(const void *v)
  {
    const uint8_t *p = (const uint8_t *)v;
    return (uint32_t)((p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3]);
  }
  #else
  /* Unaligned loads are generally ok on x86/x64. */
  #define lj_getu16(p)	(*(uint16_t *)(p))
  #define lj_getu32(p)	(*(uint32_t *)(p))
  #endif
  
  #else
  #error "missing defines for your compiler"
  #endif
  
  /* Optional defines. */
  #ifndef LJ_FASTCALL
  #define LJ_FASTCALL
  #endif
  #ifndef LJ_NORET
  #define LJ_NORET
  #endif
  #ifndef LJ_NOAPI
  #define LJ_NOAPI	extern
  #endif
  #ifndef LJ_LIKELY
  #define LJ_LIKELY(x)	(x)
  #define LJ_UNLIKELY(x)	(x)
  #endif
  
  /* Attributes for internal functions. */
  #define LJ_DATA		LJ_NOAPI
  #define LJ_DATADEF
  #define LJ_ASMF		LJ_NOAPI
  #define LJ_FUNCA	LJ_NOAPI
  #if defined(ljamalg_c)
  #define LJ_FUNC		LJ_NOAPI
  #else
  #define LJ_FUNC		LJ_NOAPI
  #endif
  #define LJ_FUNC_NORET	LJ_FUNC LJ_NORET
  #define LJ_FUNCA_NORET	LJ_FUNCA LJ_NORET
  #define LJ_ASMF_NORET	LJ_ASMF LJ_NORET
  
  /* Runtime assertions. */
  #ifdef lua_assert
  #define check_exp(c, e)		(lua_assert(c), (e))
  #define api_check(l, e)		lua_assert(e)
  #else
  #define lua_assert(c)		((void)0)
  #define check_exp(c, e)		(e)
  #define api_check		luai_apicheck
  #endif
  
  /* Static assertions. */
  #define LJ_ASSERT_NAME2(name, line)	name ## line
  #define LJ_ASSERT_NAME(line)		LJ_ASSERT_NAME2(lj_assert_, line)
  #ifdef __COUNTER__
  #define LJ_STATIC_ASSERT(cond) \
    extern void LJ_ASSERT_NAME(__COUNTER__)(int STATIC_ASSERTION_FAILED[(cond)?1:-1])
  #else
  #define LJ_STATIC_ASSERT(cond) \
    extern void LJ_ASSERT_NAME(__LINE__)(int STATIC_ASSERTION_FAILED[(cond)?1:-1])
  #endif
  
  #endif
  