mirror of
https://github.com/lua/lua
synced 2024-11-22 04:41:23 +03:00
273 lines
6.9 KiB
C
273 lines
6.9 KiB
C
/*
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** $Id: llimits.h $
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** Limits, basic types, and some other 'installation-dependent' definitions
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** See Copyright Notice in lua.h
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*/
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#ifndef llimits_h
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#define llimits_h
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#include <limits.h>
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#include <stddef.h>
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#include "lua.h"
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/*
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** 'lu_mem' is an unsigned integer big enough to count the total memory
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** used by Lua (in bytes). 'l_obj' is a signed integer big enough to
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** count the total number of objects used by Lua. (It is signed due
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** to the use of debt in several computations.) Usually, 'size_t' and
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** 'ptrdiff_t' should work, but we use 'long' for 16-bit machines.
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*/
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#if defined(LUAI_MEM) /* { external definitions? */
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typedef LUAI_UMEM lu_mem;
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typedef LUAI_MEM l_obj;
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#elif LUAI_IS32INT /* }{ */
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typedef size_t lu_mem;
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typedef ptrdiff_t l_obj;
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#else /* 16-bit ints */ /* }{ */
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typedef unsigned long lu_mem;
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typedef long l_obj;
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#endif /* } */
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#define MAX_LOBJ \
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cast(l_obj, (cast(lu_mem, 1) << (sizeof(l_obj) * CHAR_BIT - 1)) - 1)
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/* chars used as small naturals (so that 'char' is reserved for characters) */
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typedef unsigned char lu_byte;
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typedef signed char ls_byte;
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/* maximum value for size_t */
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#define MAX_SIZET ((size_t)(~(size_t)0))
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/*
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** Maximum size for strings and userdata visible for Lua; should be
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** representable as a lua_Integer and as a size_t.
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*/
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#define MAX_SIZE (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \
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: cast_sizet(LUA_MAXINTEGER))
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/*
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** floor of the log2 of the maximum signed value for integral type 't'.
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** (That is, maximum 'n' such that '2^n' fits in the given signed type.)
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*/
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#define log2maxs(t) cast_int(sizeof(t) * 8 - 2)
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/*
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** test whether an unsigned value is a power of 2 (or zero)
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*/
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#define ispow2(x) (((x) & ((x) - 1)) == 0)
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/* number of chars of a literal string without the ending \0 */
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#define LL(x) (sizeof(x)/sizeof(char) - 1)
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/*
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** conversion of pointer to unsigned integer: this is for hashing only;
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** there is no problem if the integer cannot hold the whole pointer
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** value. (In strict ISO C this may cause undefined behavior, but no
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** actual machine seems to bother.)
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*/
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#if !defined(LUA_USE_C89) && defined(__STDC_VERSION__) && \
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__STDC_VERSION__ >= 199901L
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#include <stdint.h>
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#if defined(UINTPTR_MAX) /* even in C99 this type is optional */
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#define L_P2I uintptr_t
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#else /* no 'intptr'? */
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#define L_P2I uintmax_t /* use the largest available integer */
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#endif
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#else /* C89 option */
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#define L_P2I size_t
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#endif
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#define point2uint(p) cast_uint((L_P2I)(p) & UINT_MAX)
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/* types of 'usual argument conversions' for lua_Number and lua_Integer */
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typedef LUAI_UACNUMBER l_uacNumber;
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typedef LUAI_UACINT l_uacInt;
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/*
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** Internal assertions for in-house debugging
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*/
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#if defined LUAI_ASSERT
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#undef NDEBUG
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#include <assert.h>
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#define lua_assert(c) assert(c)
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#endif
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#if defined(lua_assert)
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#define check_exp(c,e) (lua_assert(c), (e))
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/* to avoid problems with conditions too long */
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#define lua_longassert(c) ((c) ? (void)0 : lua_assert(0))
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#else
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#define lua_assert(c) ((void)0)
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#define check_exp(c,e) (e)
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#define lua_longassert(c) ((void)0)
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#endif
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/* macro to avoid warnings about unused variables */
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#if !defined(UNUSED)
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#define UNUSED(x) ((void)(x))
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#endif
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/* type casts (a macro highlights casts in the code) */
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#define cast(t, exp) ((t)(exp))
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#define cast_void(i) cast(void, (i))
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#define cast_voidp(i) cast(void *, (i))
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#define cast_num(i) cast(lua_Number, (i))
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#define cast_int(i) cast(int, (i))
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#define cast_uint(i) cast(unsigned int, (i))
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#define cast_byte(i) cast(lu_byte, (i))
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#define cast_uchar(i) cast(unsigned char, (i))
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#define cast_char(i) cast(char, (i))
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#define cast_charp(i) cast(char *, (i))
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#define cast_sizet(i) cast(size_t, (i))
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/* cast a signed lua_Integer to lua_Unsigned */
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#if !defined(l_castS2U)
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#define l_castS2U(i) ((lua_Unsigned)(i))
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#endif
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/*
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** cast a lua_Unsigned to a signed lua_Integer; this cast is
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** not strict ISO C, but two-complement architectures should
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** work fine.
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*/
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#if !defined(l_castU2S)
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#define l_castU2S(i) ((lua_Integer)(i))
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#endif
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/*
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** non-return type
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*/
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#if !defined(l_noret)
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#if defined(__GNUC__)
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#define l_noret void __attribute__((noreturn))
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#elif defined(_MSC_VER) && _MSC_VER >= 1200
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#define l_noret void __declspec(noreturn)
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#else
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#define l_noret void
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#endif
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#endif
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/*
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** Inline functions
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*/
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#if !defined(LUA_USE_C89)
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#define l_inline inline
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#elif defined(__GNUC__)
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#define l_inline __inline__
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#else
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#define l_inline /* empty */
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#endif
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#define l_sinline static l_inline
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/*
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** An unsigned with (at least) 4 bytes
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*/
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#if LUAI_IS32INT
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typedef unsigned int l_uint32;
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#else
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typedef unsigned long l_uint32;
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#endif
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/*
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** The luai_num* macros define the primitive operations over numbers.
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*/
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/* floor division (defined as 'floor(a/b)') */
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#if !defined(luai_numidiv)
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#define luai_numidiv(L,a,b) ((void)L, l_floor(luai_numdiv(L,a,b)))
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#endif
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/* float division */
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#if !defined(luai_numdiv)
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#define luai_numdiv(L,a,b) ((a)/(b))
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#endif
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/*
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** modulo: defined as 'a - floor(a/b)*b'; the direct computation
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** using this definition has several problems with rounding errors,
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** so it is better to use 'fmod'. 'fmod' gives the result of
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** 'a - trunc(a/b)*b', and therefore must be corrected when
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** 'trunc(a/b) ~= floor(a/b)'. That happens when the division has a
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** non-integer negative result: non-integer result is equivalent to
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** a non-zero remainder 'm'; negative result is equivalent to 'a' and
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** 'b' with different signs, or 'm' and 'b' with different signs
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** (as the result 'm' of 'fmod' has the same sign of 'a').
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*/
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#if !defined(luai_nummod)
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#define luai_nummod(L,a,b,m) \
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{ (void)L; (m) = l_mathop(fmod)(a,b); \
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if (((m) > 0) ? (b) < 0 : ((m) < 0 && (b) > 0)) (m) += (b); }
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#endif
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/* exponentiation */
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#if !defined(luai_numpow)
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#define luai_numpow(L,a,b) \
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((void)L, (b == 2) ? (a)*(a) : l_mathop(pow)(a,b))
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#endif
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/* the others are quite standard operations */
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#if !defined(luai_numadd)
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#define luai_numadd(L,a,b) ((a)+(b))
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#define luai_numsub(L,a,b) ((a)-(b))
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#define luai_nummul(L,a,b) ((a)*(b))
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#define luai_numunm(L,a) (-(a))
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#define luai_numeq(a,b) ((a)==(b))
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#define luai_numlt(a,b) ((a)<(b))
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#define luai_numle(a,b) ((a)<=(b))
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#define luai_numgt(a,b) ((a)>(b))
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#define luai_numge(a,b) ((a)>=(b))
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#define luai_numisnan(a) (!luai_numeq((a), (a)))
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#endif
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/*
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** {==================================================================
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** "Abstraction Layer" for basic report of messages and errors
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** ===================================================================
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*/
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/* print a string */
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#if !defined(lua_writestring)
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#define lua_writestring(s,l) fwrite((s), sizeof(char), (l), stdout)
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#endif
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/* print a newline and flush the output */
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#if !defined(lua_writeline)
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#define lua_writeline() (lua_writestring("\n", 1), fflush(stdout))
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#endif
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/* print an error message */
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#if !defined(lua_writestringerror)
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#define lua_writestringerror(s,p) \
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(fprintf(stderr, (s), (p)), fflush(stderr))
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#endif
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/* }================================================================== */
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#endif
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