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124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
/*
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** $Id: llimits.h,v 1.33 2001/10/02 16:45:03 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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** 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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#else
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#if 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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#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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/* an unsigned integer to hold hash values */
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typedef unsigned int lu_hash;
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/* its signed equivalent */
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typedef int ls_hash;
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/* an unsigned integer big enough to count the total memory used by Lua */
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typedef unsigned long lu_mem;
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/* an integer big enough to count the number of strings in use */
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typedef long ls_nstr;
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/* chars used as small naturals (so that `char' is reserved for characteres) */
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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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** (the shift removes bits that are usually 0 because of alignment)
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*/
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#define IntPoint(p) ((((lu_hash)(p)) >> 4) ^ (lu_hash)(p))
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#ifndef DEFAULT_STACK_SIZE
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#define DEFAULT_STACK_SIZE 1024
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#endif
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/* type to ensure maximum alignment */
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#ifndef LUSER_ALIGNMENT_T
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#define LUSER_ALIGNMENT_T double
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#endif
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union L_Umaxalign { LUSER_ALIGNMENT_T u; void *s; long l; };
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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 unsigned long Instruction;
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/* maximum stack for a Lua function */
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#define MAXSTACK 250
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/* maximum number of local variables */
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#ifndef MAXLOCALS
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#define MAXLOCALS 200 /* arbitrary limit (<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
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#endif
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/* maximum number of parameters in a function */
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#ifndef MAXPARAMS
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#define MAXPARAMS 100 /* arbitrary limit (<MAXLOCALS) */
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#endif
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/* number of list items to accumulate before a SETLIST instruction */
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/* (must be a power of 2) */
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#define LFIELDS_PER_FLUSH 64
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#endif
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