314 lines
7.3 KiB
C
314 lines
7.3 KiB
C
/*
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** $Id: llimits.h,v 1.135 2015/06/09 14:21:00 roberto Exp $
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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' and 'l_mem' are unsigned/signed integers big enough to count
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** the total memory used by Lua (in bytes). 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_mem;
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#elif LUAI_BITSINT >= 32 /* }{ */
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typedef size_t lu_mem;
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typedef ptrdiff_t l_mem;
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#else /* 16-bit ints */ /* }{ */
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typedef unsigned long lu_mem;
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typedef long l_mem;
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#endif /* } */
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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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/* maximum value for size_t */
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#define MAX_SIZET ((size_t)(~(size_t)0))
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/* maximum size visible for Lua (must be representable in a lua_Integer */
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#define MAX_SIZE (sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \
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: (size_t)(LUA_MAXINTEGER))
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#define MAX_LUMEM ((lu_mem)(~(lu_mem)0))
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#define MAX_LMEM ((l_mem)(MAX_LUMEM >> 1))
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#define MAX_INT INT_MAX /* maximum value of an int */
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/*
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** conversion of pointer to unsigned integer:
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** this is for hashing only; there is no problem if the integer
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** cannot hold the whole pointer value
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*/
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#define point2uint(p) ((unsigned int)((size_t)(p) & UINT_MAX))
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/* type to ensure maximum alignment */
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#if defined(LUAI_USER_ALIGNMENT_T)
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typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
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#else
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typedef union { double u; void *s; lua_Integer i; long l; } L_Umaxalign;
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#endif
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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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/* internal assertions for in-house debugging */
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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) { if (!(c)) 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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/*
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** assertion for checking API calls
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*/
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#if !defined(luai_apicheck)
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#define luai_apicheck(l,e) lua_assert(e)
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#endif
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#define api_check(l,e,msg) luai_apicheck(l,(e) && msg)
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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_byte(i) cast(lu_byte, (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_uchar(i) cast(unsigned char, (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(__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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/*
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** maximum depth for nested C calls and syntactical nested non-terminals
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** in a program. (Value must fit in an unsigned short int.)
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*/
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#if !defined(LUAI_MAXCCALLS)
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#define LUAI_MAXCCALLS 200
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#endif
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/*
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** type for virtual-machine instructions;
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** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
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*/
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#if LUAI_BITSINT >= 32
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typedef unsigned int Instruction;
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#else
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typedef unsigned long Instruction;
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#endif
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/*
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** Maximum length for short strings, that is, strings that are
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** internalized. (Cannot be smaller than reserved words or tags for
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** metamethods, as these strings must be internalized;
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** #("function") = 8, #("__newindex") = 10.)
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*/
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#if !defined(LUAI_MAXSHORTLEN)
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#define LUAI_MAXSHORTLEN 40
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#endif
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/*
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** Initial size for the string table (must be power of 2).
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** The Lua core alone registers ~50 strings (reserved words +
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** metaevent keys + a few others). Libraries would typically add
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** a few dozens more.
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*/
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#if !defined(MINSTRTABSIZE)
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#define MINSTRTABSIZE 128
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#endif
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/*
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** Size of cache for strings in the API (better be a prime)
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*/
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#if !defined(STRCACHE_SIZE)
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#define STRCACHE_SIZE 127
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#endif
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/* minimum size for string buffer */
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#if !defined(LUA_MINBUFFER)
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#define LUA_MINBUFFER 32
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#endif
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/*
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** macros that are executed whenether program enters the Lua core
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** ('lua_lock') and leaves the core ('lua_unlock')
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*/
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#if !defined(lua_lock)
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#define lua_lock(L) ((void) 0)
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#define lua_unlock(L) ((void) 0)
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#endif
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/*
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** macro executed during Lua functions at points where the
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** function can yield.
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*/
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#if !defined(luai_threadyield)
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#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
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#endif
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/*
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** these macros allow user-specific actions on threads when you defined
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** LUAI_EXTRASPACE and need to do something extra when a thread is
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** created/deleted/resumed/yielded.
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*/
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#if !defined(luai_userstateopen)
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#define luai_userstateopen(L) ((void)L)
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#endif
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#if !defined(luai_userstateclose)
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#define luai_userstateclose(L) ((void)L)
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#endif
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#if !defined(luai_userstatethread)
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#define luai_userstatethread(L,L1) ((void)L)
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#endif
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#if !defined(luai_userstatefree)
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#define luai_userstatefree(L,L1) ((void)L)
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#endif
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#if !defined(luai_userstateresume)
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#define luai_userstateresume(L,n) ((void)L)
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#endif
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#if !defined(luai_userstateyield)
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#define luai_userstateyield(L,n) ((void)L)
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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'; this definition gives NaN when
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** 'b' is huge, but the result should be 'a'. 'fmod' gives the result of
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** 'a - trunc(a/b)*b', and therefore must be corrected when 'trunc(a/b)
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** ~= floor(a/b)'. That happens when the division has a non-integer
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** negative result, which is equivalent to the test below.
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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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{ (m) = l_mathop(fmod)(a,b); if ((m)*(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) ((void)L, 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_numisnan(a) (!luai_numeq((a), (a)))
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#endif
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/*
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** macro to control inclusion of some hard tests on stack reallocation
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*/
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#if !defined(HARDSTACKTESTS)
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#define condmovestack(L) ((void)0)
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#else
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/* realloc stack keeping its size */
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#define condmovestack(L) luaD_reallocstack((L), (L)->stacksize)
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#endif
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#if !defined(HARDMEMTESTS)
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#define condchangemem(L) condmovestack(L)
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#else
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#define condchangemem(L) \
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((void)(!(G(L)->gcrunning) || (luaC_fullgc(L, 0), 1)))
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#endif
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#endif
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