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531 lines
15 KiB
531 lines
15 KiB
#include <ctype.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <inttypes.h>
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#include <assert.h>
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#define check_exp(c,e) (assert(c), (e))
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/*
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** basic types
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*/
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#define LUA_TNONE (-1)
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#define LUA_TNIL 0
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#define LUA_TBOOLEAN 1
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#define LUA_TLIGHTUSERDATA 2
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#define LUA_TNUMBER 3
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#define LUA_TSTRING 4
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#define LUA_TTABLE 5
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#define LUA_TFUNCTION 6
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#define LUA_TUSERDATA 7
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#define LUA_TTHREAD 8
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#define LUA_NUMTAGS 9
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/*
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** Extra tags for non-values
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*/
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#define LUA_TPROTO LUA_NUMTAGS
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#define LUA_TDEADKEY (LUA_NUMTAGS+1)
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/*
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** number of all possible tags (including LUA_TNONE but excluding DEADKEY)
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*/
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#define LUA_TOTALTAGS (LUA_TPROTO + 2)
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/*
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** tags for Tagged Values have the following use of bits:
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** bits 0-3: actual tag (a LUA_T* value)
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** bits 4-5: variant bits
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** bit 6: whether value is collectable
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*/
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#define VARBITS (3 << 4)
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/*
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** LUA_TFUNCTION variants:
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** 0 - Lua function
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** 1 - light C function
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** 2 - regular C function (closure)
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*/
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/* Variant tags for functions */
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#define LUA_TLCL (LUA_TFUNCTION | (0 << 4)) /* Lua closure */
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#define LUA_TLCF (LUA_TFUNCTION | (1 << 4)) /* light C function */
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#define LUA_TCCL (LUA_TFUNCTION | (2 << 4)) /* C closure */
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/* Variant tags for strings */
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#define LUA_TSHRSTR (LUA_TSTRING | (0 << 4)) /* short strings */
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#define LUA_TLNGSTR (LUA_TSTRING | (1 << 4)) /* long strings */
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/* Variant tags for numbers */
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#define LUA_TNUMFLT (LUA_TNUMBER | (0 << 4)) /* float numbers */
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#define LUA_TNUMINT (LUA_TNUMBER | (1 << 4)) /* integer numbers */
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/* Bit mark for collectable types */
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#define BIT_ISCOLLECTABLE (1 << 6)
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/* mark a tag as collectable */
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#define ctb(t) ((t) | BIT_ISCOLLECTABLE)
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typedef struct lua_State lua_State;
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typedef long long lua_Integer;
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typedef double lua_Number;
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typedef int (*lua_CFunction)(lua_State *);
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typedef unsigned char lu_byte;
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/*
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** Common type for all collectable objects
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*/
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typedef struct GCObject GCObject;
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/*
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** Common Header for all collectable objects (in macro form, to be
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** included in other objects)
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*/
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#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
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/*
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** Common type has only the common header
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*/
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struct GCObject {
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CommonHeader;
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};
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/*
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** Union of all Lua values
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*/
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typedef union Value Value;
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#define RAVI_NAN_TAGGING 1
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#if RAVI_NAN_TAGGING
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#define RAVI_NAN_TAG 0x7ffc0000
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#define RAVI_TYPE_MASK 0x0000ffff
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/*
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TODO This is little endian - need to switch lo/hi for big
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endian
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*/
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typedef struct ravi_HiLo {
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int lo;
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int hi;
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} HiLo;
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typedef union ravi_TypeOrDouble {
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HiLo hilo;
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double n;
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/* for debugging */
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unsigned char bytes[8];
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} TypeOrDouble;
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/*
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** Tagged Values. This is the basic representation of values in Lua,
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** an actual value plus a tag with its type.
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*/
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#define TValuefields Value value_; TypeOrDouble tt_
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typedef struct lua_TValue TValue;
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/* macro defining a nil value */
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#define NILCONSTANT {NULL}, { {0, (RAVI_NAN_TAG|LUA_TNIL)} }
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/* Note that numbers are not stored in value_ when NaN tagging is ON */
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#define val_(o) ((o)->value_)
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#define numval_(o) ((o)->tt_)
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#define extracttype(o) ((o)->tt_.hilo.hi & RAVI_NAN_TAG)
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/* raw type tag of a TValue */
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#define rttype(o) (extracttype(o)==RAVI_NAN_TAG ? ((o)->tt_.hilo.hi & RAVI_TYPE_MASK) : LUA_TNUMFLT)
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/* tag with no variants (bits 0-3) */
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#define novariant(x) ((x) & 0x0F)
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/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
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#define ttype(o) (rttype(o) & 0x3F)
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/* type tag of a TValue with no variants (bits 0-3) */
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#define ttnov(o) (novariant(rttype(o)))
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/* Macros to test type */
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#define checktag(o,t) (rttype(o) == (t))
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#define checktype(o,t) (ttnov(o) == (t))
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#define ttisfloat(o) (extracttype(o) != RAVI_NAN_TAG)
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#define ttisinteger(o) checktag((o), LUA_TNUMINT)
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#define ttisnumber(o) (ttisfloat(o) || ttisinteger(o))
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#define ttisnil(o) checktag((o), LUA_TNIL)
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#define ttisboolean(o) checktag((o), LUA_TBOOLEAN)
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#define ttislightuserdata(o) checktag((o), LUA_TLIGHTUSERDATA)
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#define ttisstring(o) checktype((o), LUA_TSTRING)
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#define ttisshrstring(o) checktag((o), ctb(LUA_TSHRSTR))
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#define ttislngstring(o) checktag((o), ctb(LUA_TLNGSTR))
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#define ttistable(o) checktag((o), ctb(LUA_TTABLE))
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#define ttisfunction(o) checktype(o, LUA_TFUNCTION)
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#define ttisclosure(o) ((rttype(o) & 0x1F) == LUA_TFUNCTION)
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#define ttisCclosure(o) checktag((o), ctb(LUA_TCCL))
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#define ttisLclosure(o) checktag((o), ctb(LUA_TLCL))
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#define ttislcf(o) checktag((o), LUA_TLCF)
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#define ttisfulluserdata(o) checktag((o), ctb(LUA_TUSERDATA))
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#define ttisthread(o) checktag((o), ctb(LUA_TTHREAD))
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#define ttisdeadkey(o) checktag((o), LUA_TDEADKEY)
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/* Macros to access values */
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#define ivalue(o) check_exp(ttisinteger(o), val_(o).i)
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#define fltvalue(o) check_exp(ttisfloat(o), numval_(o).n)
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#define nvalue(o) check_exp(ttisnumber(o), \
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(ttisinteger(o) ? cast_num(ivalue(o)) : fltvalue(o)))
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#define gcvalue(o) check_exp(iscollectable(o), val_(o).gc)
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#define pvalue(o) check_exp(ttislightuserdata(o), val_(o).p)
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#define tsvalue(o) check_exp(ttisstring(o), gco2ts(val_(o).gc))
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#define uvalue(o) check_exp(ttisfulluserdata(o), gco2u(val_(o).gc))
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#define clvalue(o) check_exp(ttisclosure(o), gco2cl(val_(o).gc))
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#define clLvalue(o) check_exp(ttisLclosure(o), gco2lcl(val_(o).gc))
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#define clCvalue(o) check_exp(ttisCclosure(o), gco2ccl(val_(o).gc))
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#define fvalue(o) check_exp(ttislcf(o), val_(o).f)
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#define hvalue(o) check_exp(ttistable(o), gco2t(val_(o).gc))
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#define bvalue(o) check_exp(ttisboolean(o), val_(o).b)
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#define thvalue(o) check_exp(ttisthread(o), gco2th(val_(o).gc))
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/* a dead value may get the 'gc' field, but cannot access its contents */
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#define deadvalue(o) check_exp(ttisdeadkey(o), cast(void *, val_(o).gc))
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#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
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#define iscollectable(o) (rttype(o) & BIT_ISCOLLECTABLE)
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/* Macros for internal tests */
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#define righttt(obj) (ttype(obj) == gcvalue(obj)->tt)
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#define checkliveness(g,obj) \
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lua_longassert(!iscollectable(obj) || \
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(righttt(obj) && !isdead(g,gcvalue(obj))))
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/* Macros to set values */
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#define settt_(o,t) ((o)->tt_.hilo.hi=(t|RAVI_NAN_TAG))
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#define setfltvalue(obj,x) \
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{ TValue *io=(obj); numval_(io).n=(x); }
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#define setivalue(obj,x) \
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{ TValue *io=(obj); val_(io).i=(x); settt_(io, LUA_TNUMINT); }
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#define setnilvalue(obj) settt_(obj, LUA_TNIL)
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#define setfvalue(obj,x) \
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{ TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_TLCF); }
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#define setpvalue(obj,x) \
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{ TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }
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#define setbvalue(obj,x) \
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{ TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }
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#define setgcovalue(L,obj,x) \
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{ TValue *io = (obj); GCObject *i_g=(x); \
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val_(io).gc = i_g; settt_(io, ctb(i_g->tt)); }
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#define setsvalue(L,obj,x) \
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{ TValue *io = (obj); TString *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(x_->tt)); \
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checkliveness(G(L),io); }
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#define setuvalue(L,obj,x) \
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{ TValue *io = (obj); Udata *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TUSERDATA)); \
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checkliveness(G(L),io); }
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#define setthvalue(L,obj,x) \
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{ TValue *io = (obj); lua_State *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TTHREAD)); \
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checkliveness(G(L),io); }
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#define setclLvalue(L,obj,x) \
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{ TValue *io = (obj); LClosure *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TLCL)); \
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checkliveness(G(L),io); }
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#define setclCvalue(L,obj,x) \
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{ TValue *io = (obj); CClosure *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TCCL)); \
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checkliveness(G(L),io); }
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#define sethvalue(L,obj,x) \
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{ TValue *io = (obj); Table *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TTABLE)); \
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checkliveness(G(L),io); }
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#define setdeadvalue(obj) settt_(obj, LUA_TDEADKEY)
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#define setobj(L,obj1,obj2) \
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{ TValue *io1=(obj1); *io1 = *(obj2); \
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(void)L; checkliveness(G(L),io1); }
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/*
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** different types of assignments, according to destination
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*/
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/* from stack to (same) stack */
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#define setobjs2s setobj
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/* to stack (not from same stack) */
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#define setobj2s setobj
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#define setsvalue2s setsvalue
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#define sethvalue2s sethvalue
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#define setptvalue2s setptvalue
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/* from table to same table */
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#define setobjt2t setobj
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/* to table */
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#define setobj2t setobj
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/* to new object */
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#define setobj2n setobj
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#define setsvalue2n setsvalue
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#else
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/*
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** Tagged Values. This is the basic representation of values in Lua,
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** an actual value plus a tag with its type.
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*/
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#define TValuefields Value value_; int tt_
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typedef struct lua_TValue TValue;
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/* macro defining a nil value */
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#define NILCONSTANT {NULL}, LUA_TNIL
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#define val_(o) ((o)->value_)
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/* raw type tag of a TValue */
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#define rttype(o) ((o)->tt_)
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/* tag with no variants (bits 0-3) */
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#define novariant(x) ((x) & 0x0F)
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/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
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#define ttype(o) (rttype(o) & 0x3F)
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/* type tag of a TValue with no variants (bits 0-3) */
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#define ttnov(o) (novariant(rttype(o)))
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/* Macros to test type */
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#define checktag(o,t) (rttype(o) == (t))
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#define checktype(o,t) (ttnov(o) == (t))
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#define ttisnumber(o) checktype((o), LUA_TNUMBER)
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#define ttisfloat(o) checktag((o), LUA_TNUMFLT)
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#define ttisinteger(o) checktag((o), LUA_TNUMINT)
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#define ttisnil(o) checktag((o), LUA_TNIL)
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#define ttisboolean(o) checktag((o), LUA_TBOOLEAN)
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#define ttislightuserdata(o) checktag((o), LUA_TLIGHTUSERDATA)
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#define ttisstring(o) checktype((o), LUA_TSTRING)
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#define ttisshrstring(o) checktag((o), ctb(LUA_TSHRSTR))
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#define ttislngstring(o) checktag((o), ctb(LUA_TLNGSTR))
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#define ttistable(o) checktag((o), ctb(LUA_TTABLE))
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#define ttisfunction(o) checktype(o, LUA_TFUNCTION)
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#define ttisclosure(o) ((rttype(o) & 0x1F) == LUA_TFUNCTION)
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#define ttisCclosure(o) checktag((o), ctb(LUA_TCCL))
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#define ttisLclosure(o) checktag((o), ctb(LUA_TLCL))
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#define ttislcf(o) checktag((o), LUA_TLCF)
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#define ttisfulluserdata(o) checktag((o), ctb(LUA_TUSERDATA))
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#define ttisthread(o) checktag((o), ctb(LUA_TTHREAD))
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#define ttisdeadkey(o) checktag((o), LUA_TDEADKEY)
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/* Macros to access values */
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#define ivalue(o) check_exp(ttisinteger(o), val_(o).i)
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#define fltvalue(o) check_exp(ttisfloat(o), val_(o).n)
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#define nvalue(o) check_exp(ttisnumber(o), \
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(ttisinteger(o) ? cast_num(ivalue(o)) : fltvalue(o)))
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#define gcvalue(o) check_exp(iscollectable(o), val_(o).gc)
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#define pvalue(o) check_exp(ttislightuserdata(o), val_(o).p)
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#define tsvalue(o) check_exp(ttisstring(o), gco2ts(val_(o).gc))
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#define uvalue(o) check_exp(ttisfulluserdata(o), gco2u(val_(o).gc))
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#define clvalue(o) check_exp(ttisclosure(o), gco2cl(val_(o).gc))
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#define clLvalue(o) check_exp(ttisLclosure(o), gco2lcl(val_(o).gc))
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#define clCvalue(o) check_exp(ttisCclosure(o), gco2ccl(val_(o).gc))
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#define fvalue(o) check_exp(ttislcf(o), val_(o).f)
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#define hvalue(o) check_exp(ttistable(o), gco2t(val_(o).gc))
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#define bvalue(o) check_exp(ttisboolean(o), val_(o).b)
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#define thvalue(o) check_exp(ttisthread(o), gco2th(val_(o).gc))
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/* a dead value may get the 'gc' field, but cannot access its contents */
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#define deadvalue(o) check_exp(ttisdeadkey(o), cast(void *, val_(o).gc))
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#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
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#define iscollectable(o) (rttype(o) & BIT_ISCOLLECTABLE)
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/* Macros for internal tests */
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#define righttt(obj) (ttype(obj) == gcvalue(obj)->tt)
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#define checkliveness(g,obj) \
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lua_longassert(!iscollectable(obj) || \
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(righttt(obj) && !isdead(g,gcvalue(obj))))
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/* Macros to set values */
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#define settt_(o,t) ((o)->tt_=(t))
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#define setfltvalue(obj,x) \
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{ TValue *io=(obj); val_(io).n=(x); settt_(io, LUA_TNUMFLT); }
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#define setivalue(obj,x) \
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{ TValue *io=(obj); val_(io).i=(x); settt_(io, LUA_TNUMINT); }
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#define setnilvalue(obj) settt_(obj, LUA_TNIL)
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#define setfvalue(obj,x) \
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{ TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_TLCF); }
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#define setpvalue(obj,x) \
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{ TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }
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#define setbvalue(obj,x) \
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{ TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }
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#define setgcovalue(L,obj,x) \
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{ TValue *io = (obj); GCObject *i_g=(x); \
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val_(io).gc = i_g; settt_(io, ctb(i_g->tt)); }
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#define setsvalue(L,obj,x) \
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{ TValue *io = (obj); TString *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(x_->tt)); \
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checkliveness(G(L),io); }
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#define setuvalue(L,obj,x) \
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{ TValue *io = (obj); Udata *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TUSERDATA)); \
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checkliveness(G(L),io); }
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#define setthvalue(L,obj,x) \
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{ TValue *io = (obj); lua_State *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TTHREAD)); \
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checkliveness(G(L),io); }
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#define setclLvalue(L,obj,x) \
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{ TValue *io = (obj); LClosure *x_ = (x); \
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|
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TLCL)); \
|
|
checkliveness(G(L),io); }
|
|
|
|
#define setclCvalue(L,obj,x) \
|
|
{ TValue *io = (obj); CClosure *x_ = (x); \
|
|
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TCCL)); \
|
|
checkliveness(G(L),io); }
|
|
|
|
#define sethvalue(L,obj,x) \
|
|
{ TValue *io = (obj); Table *x_ = (x); \
|
|
val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TTABLE)); \
|
|
checkliveness(G(L),io); }
|
|
|
|
#define setdeadvalue(obj) settt_(obj, LUA_TDEADKEY)
|
|
|
|
|
|
|
|
#define setobj(L,obj1,obj2) \
|
|
{ TValue *io1=(obj1); *io1 = *(obj2); \
|
|
(void)L; checkliveness(G(L),io1); }
|
|
|
|
|
|
/*
|
|
** different types of assignments, according to destination
|
|
*/
|
|
|
|
/* from stack to (same) stack */
|
|
#define setobjs2s setobj
|
|
/* to stack (not from same stack) */
|
|
#define setobj2s setobj
|
|
#define setsvalue2s setsvalue
|
|
#define sethvalue2s sethvalue
|
|
#define setptvalue2s setptvalue
|
|
/* from table to same table */
|
|
#define setobjt2t setobj
|
|
/* to table */
|
|
#define setobj2t setobj
|
|
/* to new object */
|
|
#define setobj2n setobj
|
|
#define setsvalue2n setsvalue
|
|
|
|
|
|
#endif
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** types and prototypes
|
|
** =======================================================
|
|
*/
|
|
|
|
|
|
union Value {
|
|
GCObject *gc; /* collectable objects */
|
|
void *p; /* light userdata */
|
|
int b; /* booleans */
|
|
lua_CFunction f; /* light C functions */
|
|
lua_Integer i; /* integer numbers */
|
|
lua_Number n; /* float numbers */
|
|
};
|
|
|
|
|
|
struct lua_TValue {
|
|
TValuefields;
|
|
};
|
|
|
|
static void dumpvalue(TValue* v)
|
|
{
|
|
// Litle endian assumed
|
|
for (int i = 7; i >= 0; i--) {
|
|
printf("%02x", v->tt_.bytes[i]);
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
|
|
int main(int argc, const char **argv) {
|
|
|
|
(void)argc;
|
|
(void)argv;
|
|
|
|
TValue v = { NILCONSTANT };
|
|
dumpvalue(&v);
|
|
assert(ttisnil(&v));
|
|
|
|
setivalue(&v, 55);
|
|
assert(ttisinteger(&v));
|
|
assert(ttisnumber(&v));
|
|
assert(ivalue(&v) == 55);
|
|
|
|
setfltvalue(&v, 152.76);
|
|
assert(ttisnumber(&v));
|
|
assert(ttisfloat(&v));
|
|
assert(fltvalue(&v) == 152.76);
|
|
|
|
return 0;
|
|
} |