mirror of https://github.com/lua/lua
335 lines
7.3 KiB
C
335 lines
7.3 KiB
C
/*
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** $Id: lobject.h,v 1.154 2002/11/14 11:51:50 roberto Exp roberto $
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** Type definitions for Lua objects
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** See Copyright Notice in lua.h
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*/
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#ifndef lobject_h
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#define lobject_h
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#include "llimits.h"
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#include "lua.h"
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/* tags for values visible from Lua */
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#define NUM_TAGS LUA_TTHREAD
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/*
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** Extra tags for non-values
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*/
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#define LUA_TPROTO (NUM_TAGS+1)
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#define LUA_TUPVAL (NUM_TAGS+2)
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/*
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** Union of all collectable objects
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*/
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typedef union 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 header in struct form
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*/
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typedef struct GCheader {
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CommonHeader;
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} GCheader;
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/*
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** Union of all Lua values
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*/
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typedef union {
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GCObject *gc;
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void *p;
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lua_Number n;
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int b;
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} Value;
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/*
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** Lua values (or `tagged objects')
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*/
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typedef struct lua_TObject {
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int tt;
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Value value;
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} TObject;
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/* Macros to test type */
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#define ttisnil(o) (ttype(o) == LUA_TNIL)
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#define ttisnumber(o) (ttype(o) == LUA_TNUMBER)
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#define ttisstring(o) (ttype(o) == LUA_TSTRING)
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#define ttistable(o) (ttype(o) == LUA_TTABLE)
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#define ttisfunction(o) (ttype(o) == LUA_TFUNCTION)
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#define ttisboolean(o) (ttype(o) == LUA_TBOOLEAN)
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#define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA)
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#define ttisthread(o) (ttype(o) == LUA_TTHREAD)
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#define ttislightuserdata(o) (ttype(o) == LUA_TLIGHTUSERDATA)
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/* Macros to access values */
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#define ttype(o) ((o)->tt)
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#define gcvalue(o) check_exp(iscollectable(o), (o)->value.gc)
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#define pvalue(o) check_exp(ttislightuserdata(o), (o)->value.p)
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#define nvalue(o) check_exp(ttisnumber(o), (o)->value.n)
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#define tsvalue(o) check_exp(ttisstring(o), &(o)->value.gc->ts)
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#define uvalue(o) check_exp(ttisuserdata(o), &(o)->value.gc->u)
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#define clvalue(o) check_exp(ttisfunction(o), &(o)->value.gc->cl)
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#define hvalue(o) check_exp(ttistable(o), &(o)->value.gc->h)
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#define bvalue(o) check_exp(ttisboolean(o), (o)->value.b)
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#define thvalue(o) check_exp(ttisthread(o), &(o)->value.gc->th)
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#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
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/* Macros to set values */
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#define setnvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TNUMBER; i_o->value.n=(x); }
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#define chgnvalue(obj,x) \
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check_exp(ttype(obj)==LUA_TNUMBER, (obj)->value.n=(x))
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#define setpvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TLIGHTUSERDATA; i_o->value.p=(x); }
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#define setbvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TBOOLEAN; i_o->value.b=(x); }
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#define setsvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TSTRING; \
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i_o->value.gc=cast(GCObject *, (x)); \
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lua_assert(i_o->value.gc->gch.tt == LUA_TSTRING); }
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#define setuvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TUSERDATA; \
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i_o->value.gc=cast(GCObject *, (x)); \
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lua_assert(i_o->value.gc->gch.tt == LUA_TUSERDATA); }
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#define setthvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TTHREAD; \
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i_o->value.gc=cast(GCObject *, (x)); \
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lua_assert(i_o->value.gc->gch.tt == LUA_TTHREAD); }
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#define setclvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TFUNCTION; \
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i_o->value.gc=cast(GCObject *, (x)); \
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lua_assert(i_o->value.gc->gch.tt == LUA_TFUNCTION); }
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#define sethvalue(obj,x) \
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{ TObject *i_o=(obj); i_o->tt=LUA_TTABLE; \
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i_o->value.gc=cast(GCObject *, (x)); \
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lua_assert(i_o->value.gc->gch.tt == LUA_TTABLE); }
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#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
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/*
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** for internal debug only
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*/
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#define checkconsistency(obj) \
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lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
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#define setobj(obj1,obj2) \
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{ const TObject *o2=(obj2); TObject *o1=(obj1); \
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checkconsistency(o2); \
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o1->tt=o2->tt; o1->value = o2->value; }
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/*
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** different types of sets, 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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/* 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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#define setttype(obj, tt) (ttype(obj) = (tt))
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#define iscollectable(o) (ttype(o) >= LUA_TSTRING)
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typedef TObject *StkId; /* index to stack elements */
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/*
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** String headers for string table
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*/
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typedef union TString {
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L_Umaxalign dummy; /* ensures maximum alignment for strings */
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struct {
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CommonHeader;
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lu_byte reserved;
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lu_hash hash;
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size_t len;
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} tsv;
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} TString;
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#define getstr(ts) cast(const char *, (ts) + 1)
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#define svalue(o) getstr(tsvalue(o))
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typedef union Udata {
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L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
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struct {
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CommonHeader;
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struct Table *metatable;
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size_t len;
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} uv;
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} Udata;
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/*
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** Function Prototypes
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*/
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typedef struct Proto {
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CommonHeader;
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TObject *k; /* constants used by the function */
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Instruction *code;
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struct Proto **p; /* functions defined inside the function */
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int *lineinfo; /* map from opcodes to source lines */
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struct LocVar *locvars; /* information about local variables */
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TString *source;
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int sizek; /* size of `k' */
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int sizecode;
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int sizelineinfo;
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int sizep; /* size of `p' */
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int sizelocvars;
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int lineDefined;
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GCObject *gclist;
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lu_byte nupvalues;
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lu_byte numparams;
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lu_byte is_vararg;
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lu_byte maxstacksize;
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} Proto;
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typedef struct LocVar {
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TString *varname;
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int startpc; /* first point where variable is active */
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int endpc; /* first point where variable is dead */
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} LocVar;
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/*
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** Upvalues
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*/
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typedef struct UpVal {
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CommonHeader;
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TObject *v; /* points to stack or to its own value */
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TObject value; /* the value (when closed) */
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} UpVal;
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/*
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** Closures
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*/
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#define ClosureHeader \
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CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist
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typedef struct CClosure {
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ClosureHeader;
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lua_CFunction f;
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TObject upvalue[1];
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} CClosure;
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typedef struct LClosure {
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ClosureHeader;
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struct Proto *p;
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TObject g; /* global table for this closure */
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UpVal *upvals[1];
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} LClosure;
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typedef union Closure {
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CClosure c;
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LClosure l;
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} Closure;
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#define iscfunction(o) (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
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#define isLfunction(o) (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
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/*
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** Tables
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*/
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typedef struct Node {
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TObject i_key;
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TObject i_val;
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struct Node *next; /* for chaining */
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} Node;
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typedef struct Table {
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CommonHeader;
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lu_byte flags; /* 1<<p means tagmethod(p) is not present */
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lu_byte lsizenode; /* log2 of size of `node' array */
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struct Table *metatable;
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TObject *array; /* array part */
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Node *node;
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Node *firstfree; /* this position is free; all positions after it are full */
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GCObject *gclist;
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int sizearray; /* size of `array' array */
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} Table;
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/*
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** `module' operation for hashing (size is always a power of 2)
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*/
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#define lmod(s,size) \
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check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1))))
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#define twoto(x) (1<<(x))
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#define sizenode(t) (twoto((t)->lsizenode))
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#define sizearray(t) ((t)->sizearray)
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extern const TObject luaO_nilobject;
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int luaO_log2 (unsigned int x);
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int luaO_rawequalObj (const TObject *t1, const TObject *t2);
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int luaO_str2d (const char *s, lua_Number *result);
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const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp);
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const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
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void luaO_chunkid (char *out, const char *source, int len);
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#endif
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