mirror of
https://github.com/lua/lua
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181 lines
3.3 KiB
C
181 lines
3.3 KiB
C
/*
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** $Id: llimits.h,v 1.55 2003/05/14 21:01:53 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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/*
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** try to find number of bits in an integer
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*/
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#ifndef BITS_INT
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/* avoid overflows in comparison */
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#if INT_MAX-20 < 32760
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#define BITS_INT 16
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#elif INT_MAX > 2147483640L
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/* machine has at least 32 bits */
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#define BITS_INT 32
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#else
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#error "you must define BITS_INT with number of bits in an integer"
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#endif
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#endif
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/*
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** the following types define integer types for values that may not
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** fit in a `small int' (16 bits), but may waste space in a
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** `large long' (64 bits). The current definitions should work in
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** any machine, but may not be optimal.
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*/
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/*
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** an unsigned integer with at least 32 bits
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*/
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#ifndef LUA_UINT32
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#define LUA_UINT32 unsigned long
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#endif
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typedef LUA_UINT32 lu_int32;
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/*
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** an unsigned integer big enough to count the total memory used by Lua;
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** it should be at least as large as `size_t'
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*/
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typedef lu_int32 lu_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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#define MAX_SIZET ((size_t)(~(size_t)0)-2)
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#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
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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 IntPoint(p) ((unsigned int)(p))
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/* type to ensure maximum alignment */
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#ifndef LUSER_ALIGNMENT_T
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typedef union { double u; void *s; long l; } L_Umaxalign;
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#else
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typedef LUSER_ALIGNMENT_T L_Umaxalign;
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#endif
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/* result of `usual argument conversion' over lua_Number */
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#ifndef LUA_UACNUMBER
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typedef double l_uacNumber;
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#else
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typedef LUA_UACNUMBER l_uacNumber;
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#endif
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#ifndef lua_assert
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#define lua_assert(c) /* empty */
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#endif
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#ifndef check_exp
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#define check_exp(c,e) (e)
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#endif
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#ifndef UNUSED
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#define UNUSED(x) ((void)(x)) /* to avoid warnings */
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#endif
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#ifndef cast
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#define cast(t, exp) ((t)(exp))
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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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typedef lu_int32 Instruction;
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/* maximum depth for calls (unsigned short) */
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#ifndef LUA_MAXCALLS
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#define LUA_MAXCALLS 4096
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#endif
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/*
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** maximum depth for C calls (unsigned short): Not too big, or may
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** overflow the C stack...
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*/
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#ifndef LUA_MAXCCALLS
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#define LUA_MAXCCALLS 200
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#endif
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/* maximum size for the virtual stack of a C function */
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#ifndef LUA_MAXCSTACK
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#define LUA_MAXCSTACK 2048
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#endif
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/* maximum stack for a Lua function */
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#define MAXSTACK 250
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/* maximum number of variables declared in a function */
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#ifndef MAXVARS
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#define MAXVARS 200 /* <MAXSTACK */
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#endif
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/* maximum number of upvalues per function */
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#ifndef MAXUPVALUES
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#define MAXUPVALUES 32 /* <MAXSTACK */
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#endif
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/* minimum size for the string table (must be power of 2) */
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#ifndef MINSTRTABSIZE
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#define MINSTRTABSIZE 32
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#endif
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/* minimum size for string buffer */
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#ifndef LUA_MINBUFFER
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#define LUA_MINBUFFER 32
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#endif
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/*
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** maximum number of syntactical nested non-terminals: Not too big,
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** or may overflow the C stack...
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*/
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#ifndef LUA_MAXPARSERLEVEL
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#define LUA_MAXPARSERLEVEL 200
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#endif
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#endif
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