mirror of
https://github.com/lua/lua
synced 2024-11-26 22:59:35 +03:00
235 lines
4.9 KiB
C
235 lines
4.9 KiB
C
/*
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** $Id: llimits.h,v 1.119 2014/07/18 18:18:45 roberto Exp roberto $
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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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typedef unsigned LUA_INT32 lu_int32;
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typedef LUAI_UMEM lu_mem;
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typedef LUAI_MEM l_mem;
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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 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 point2int(p) ((unsigned int)((lu_mem)(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(LUA_USE_APICHECK)
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#include <assert.h>
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#define luai_apicheck(e) assert(e)
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#else
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#define luai_apicheck(e) lua_assert(e)
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#endif
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#define api_check(e,msg) luai_apicheck((e) && msg)
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#if !defined(UNUSED)
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#define UNUSED(x) ((void)(x)) /* to avoid warnings */
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#endif
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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 ANSI 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)
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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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** maximum number of upvalues in a closure (both C and Lua). (Value
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** must fit in an unsigned char.)
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*/
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#define MAXUPVAL UCHAR_MAX
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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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typedef lu_int32 Instruction;
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/* maximum stack for a Lua function */
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#define MAXSTACK 250
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/* minimum size for the string table (must be power of 2) */
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#if !defined(MINSTRTABSIZE)
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#define MINSTRTABSIZE 64 /* minimum size for "predefined" strings */
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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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#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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#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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** 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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