lobject.h
上传用户:yisoukefu
上传日期:2020-08-09
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文件大小:8k
- /*
- ** $Id: lobject.h,v 2.20 2006/01/18 11:37:34 roberto Exp $
- ** Type definitions for Lua objects
- ** See Copyright Notice in lua.h
- */
- #ifndef lobject_h
- #define lobject_h
- #include <stdarg.h>
- #include "llimits.h"
- #include "lua.h"
- /* tags for values visible from Lua */
- #define LAST_TAG LUA_TTHREAD
- #define NUM_TAGS (LAST_TAG+1)
- /*
- ** Extra tags for non-values
- */
- #define LUA_TPROTO (LAST_TAG+1)
- #define LUA_TUPVAL (LAST_TAG+2)
- #define LUA_TDEADKEY (LAST_TAG+3)
- /*
- ** Union of all collectable objects
- */
- typedef union GCObject GCObject;
- /*
- ** Common Header for all collectable objects (in macro form, to be
- ** included in other objects)
- */
- #define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
- /*
- ** Common header in struct form
- */
- typedef struct GCheader {
- CommonHeader;
- } GCheader;
- /*
- ** Union of all Lua values
- */
- typedef union {
- GCObject *gc;
- void *p;
- lua_Number n;
- int b;
- } Value;
- /*
- ** Tagged Values
- */
- #define TValuefields Value value; int tt
- typedef struct lua_TValue {
- TValuefields;
- } TValue;
- /* Macros to test type */
- #define ttisnil(o) (ttype(o) == LUA_TNIL)
- #define ttisnumber(o) (ttype(o) == LUA_TNUMBER)
- #define ttisstring(o) (ttype(o) == LUA_TSTRING)
- #define ttistable(o) (ttype(o) == LUA_TTABLE)
- #define ttisfunction(o) (ttype(o) == LUA_TFUNCTION)
- #define ttisboolean(o) (ttype(o) == LUA_TBOOLEAN)
- #define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA)
- #define ttisthread(o) (ttype(o) == LUA_TTHREAD)
- #define ttislightuserdata(o) (ttype(o) == LUA_TLIGHTUSERDATA)
- /* Macros to access values */
- #define ttype(o) ((o)->tt)
- #define gcvalue(o) check_exp(iscollectable(o), (o)->value.gc)
- #define pvalue(o) check_exp(ttislightuserdata(o), (o)->value.p)
- #define nvalue(o) check_exp(ttisnumber(o), (o)->value.n)
- #define rawtsvalue(o) check_exp(ttisstring(o), &(o)->value.gc->ts)
- #define tsvalue(o) (&rawtsvalue(o)->tsv)
- #define rawuvalue(o) check_exp(ttisuserdata(o), &(o)->value.gc->u)
- #define uvalue(o) (&rawuvalue(o)->uv)
- #define clvalue(o) check_exp(ttisfunction(o), &(o)->value.gc->cl)
- #define hvalue(o) check_exp(ttistable(o), &(o)->value.gc->h)
- #define bvalue(o) check_exp(ttisboolean(o), (o)->value.b)
- #define thvalue(o) check_exp(ttisthread(o), &(o)->value.gc->th)
- #define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
- /*
- ** for internal debug only
- */
- #define checkconsistency(obj)
- lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
- #define checkliveness(g,obj)
- lua_assert(!iscollectable(obj) ||
- ((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc)))
- /* Macros to set values */
- #define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
- #define setnvalue(obj,x)
- { TValue *i_o=(obj); i_o->value.n=(x); i_o->tt=LUA_TNUMBER; }
- #define setpvalue(obj,x)
- { TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
- #define setbvalue(obj,x)
- { TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
- #define setsvalue(L,obj,x)
- { TValue *i_o=(obj);
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING;
- checkliveness(G(L),i_o); }
- #define setuvalue(L,obj,x)
- { TValue *i_o=(obj);
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA;
- checkliveness(G(L),i_o); }
- #define setthvalue(L,obj,x)
- { TValue *i_o=(obj);
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD;
- checkliveness(G(L),i_o); }
- #define setclvalue(L,obj,x)
- { TValue *i_o=(obj);
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TFUNCTION;
- checkliveness(G(L),i_o); }
- #define sethvalue(L,obj,x)
- { TValue *i_o=(obj);
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE;
- checkliveness(G(L),i_o); }
- #define setptvalue(L,obj,x)
- { TValue *i_o=(obj);
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TPROTO;
- checkliveness(G(L),i_o); }
- #define setobj(L,obj1,obj2)
- { const TValue *o2=(obj2); TValue *o1=(obj1);
- o1->value = o2->value; o1->tt=o2->tt;
- checkliveness(G(L),o1); }
- /*
- ** different types of sets, 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
- #define setttype(obj, tt) (ttype(obj) = (tt))
- #define iscollectable(o) (ttype(o) >= LUA_TSTRING)
- typedef TValue *StkId; /* index to stack elements */
- /*
- ** String headers for string table
- */
- typedef union TString {
- L_Umaxalign dummy; /* ensures maximum alignment for strings */
- struct {
- CommonHeader;
- lu_byte reserved;
- unsigned int hash;
- size_t len;
- } tsv;
- } TString;
- #define getstr(ts) cast(const char *, (ts) + 1)
- #define svalue(o) getstr(tsvalue(o))
- typedef union Udata {
- L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
- struct {
- CommonHeader;
- struct Table *metatable;
- struct Table *env;
- size_t len;
- } uv;
- } Udata;
- /*
- ** Function Prototypes
- */
- typedef struct Proto {
- CommonHeader;
- TValue *k; /* constants used by the function */
- Instruction *code;
- struct Proto **p; /* functions defined inside the function */
- int *lineinfo; /* map from opcodes to source lines */
- struct LocVar *locvars; /* information about local variables */
- TString **upvalues; /* upvalue names */
- TString *source;
- int sizeupvalues;
- int sizek; /* size of `k' */
- int sizecode;
- int sizelineinfo;
- int sizep; /* size of `p' */
- int sizelocvars;
- int linedefined;
- int lastlinedefined;
- GCObject *gclist;
- lu_byte nups; /* number of upvalues */
- lu_byte numparams;
- lu_byte is_vararg;
- lu_byte maxstacksize;
- } Proto;
- /* masks for new-style vararg */
- #define VARARG_HASARG 1
- #define VARARG_ISVARARG 2
- #define VARARG_NEEDSARG 4
- typedef struct LocVar {
- TString *varname;
- int startpc; /* first point where variable is active */
- int endpc; /* first point where variable is dead */
- } LocVar;
- /*
- ** Upvalues
- */
- typedef struct UpVal {
- CommonHeader;
- TValue *v; /* points to stack or to its own value */
- union {
- TValue value; /* the value (when closed) */
- struct { /* double linked list (when open) */
- struct UpVal *prev;
- struct UpVal *next;
- } l;
- } u;
- } UpVal;
- /*
- ** Closures
- */
- #define ClosureHeader
- CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist;
- struct Table *env
- typedef struct CClosure {
- ClosureHeader;
- lua_CFunction f;
- TValue upvalue[1];
- } CClosure;
- typedef struct LClosure {
- ClosureHeader;
- struct Proto *p;
- UpVal *upvals[1];
- } LClosure;
- typedef union Closure {
- CClosure c;
- LClosure l;
- } Closure;
- #define iscfunction(o) (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
- #define isLfunction(o) (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
- /*
- ** Tables
- */
- typedef union TKey {
- struct {
- TValuefields;
- struct Node *next; /* for chaining */
- } nk;
- TValue tvk;
- } TKey;
- typedef struct Node {
- TValue i_val;
- TKey i_key;
- } Node;
- typedef struct Table {
- CommonHeader;
- lu_byte flags; /* 1<<p means tagmethod(p) is not present */
- lu_byte lsizenode; /* log2 of size of `node' array */
- struct Table *metatable;
- TValue *array; /* array part */
- Node *node;
- Node *lastfree; /* any free position is before this position */
- GCObject *gclist;
- int sizearray; /* size of `array' array */
- void *userdata;
- } Table;
- /*
- ** `module' operation for hashing (size is always a power of 2)
- */
- #define lmod(s,size)
- (check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1)))))
- #define twoto(x) (1<<(x))
- #define sizenode(t) (twoto((t)->lsizenode))
- #define luaO_nilobject (&luaO_nilobject_)
- LUAI_DATA const TValue luaO_nilobject_;
- #define ceillog2(x) (luaO_log2((x)-1) + 1)
- LUAI_FUNC int luaO_log2 (unsigned int x);
- LUAI_FUNC int luaO_int2fb (unsigned int x);
- LUAI_FUNC int luaO_fb2int (int x);
- LUAI_FUNC int luaO_rawequalObj (const TValue *t1, const TValue *t2);
- LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result);
- LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
- va_list argp);
- LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
- LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t len);
- #endif