| /* |
| ** $Id: lobject.h,v 1.158 2003/02/18 16:02:56 roberto Exp roberto $ |
| ** Type definitions for Lua objects |
| ** See Copyright Notice in lua.h |
| */ |
| |
| #ifndef lobject_h |
| #define lobject_h |
| |
| |
| #include "llimits.h" |
| #include "lua.h" |
| |
| |
| /* tags for values visible from Lua */ |
| #define NUM_TAGS LUA_TTHREAD |
| |
| |
| /* |
| ** Extra tags for non-values |
| */ |
| #define LUA_TPROTO (NUM_TAGS+1) |
| #define LUA_TUPVAL (NUM_TAGS+2) |
| |
| |
| /* |
| ** 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; |
| |
| |
| /* |
| ** Lua values (or `tagged objects') |
| */ |
| typedef struct lua_TObject { |
| int tt; |
| Value value; |
| } TObject; |
| |
| |
| /* 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 tsvalue(o) check_exp(ttisstring(o), &(o)->value.gc->ts) |
| #define uvalue(o) check_exp(ttisuserdata(o), &(o)->value.gc->u) |
| #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)) |
| |
| /* Macros to set values */ |
| #define setnvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TNUMBER; i_o->value.n=(x); } |
| |
| #define chgnvalue(obj,x) \ |
| check_exp(ttype(obj)==LUA_TNUMBER, (obj)->value.n=(x)) |
| |
| #define setpvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TLIGHTUSERDATA; i_o->value.p=(x); } |
| |
| #define setbvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TBOOLEAN; i_o->value.b=(x); } |
| |
| #define setsvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TSTRING; \ |
| i_o->value.gc=cast(GCObject *, (x)); \ |
| lua_assert(i_o->value.gc->gch.tt == LUA_TSTRING); } |
| |
| #define setuvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TUSERDATA; \ |
| i_o->value.gc=cast(GCObject *, (x)); \ |
| lua_assert(i_o->value.gc->gch.tt == LUA_TUSERDATA); } |
| |
| #define setthvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TTHREAD; \ |
| i_o->value.gc=cast(GCObject *, (x)); \ |
| lua_assert(i_o->value.gc->gch.tt == LUA_TTHREAD); } |
| |
| #define setclvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TFUNCTION; \ |
| i_o->value.gc=cast(GCObject *, (x)); \ |
| lua_assert(i_o->value.gc->gch.tt == LUA_TFUNCTION); } |
| |
| #define sethvalue(obj,x) \ |
| { TObject *i_o=(obj); i_o->tt=LUA_TTABLE; \ |
| i_o->value.gc=cast(GCObject *, (x)); \ |
| lua_assert(i_o->value.gc->gch.tt == LUA_TTABLE); } |
| |
| #define setnilvalue(obj) ((obj)->tt=LUA_TNIL) |
| |
| |
| |
| /* |
| ** for internal debug only |
| */ |
| #define checkconsistency(obj) \ |
| lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt)) |
| |
| |
| #define setobj(obj1,obj2) \ |
| { const TObject *o2=(obj2); TObject *o1=(obj1); \ |
| checkconsistency(o2); \ |
| o1->tt=o2->tt; o1->value = o2->value; } |
| |
| |
| /* |
| ** 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 |
| /* 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 TObject *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; |
| lu_hash 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; |
| size_t len; |
| } uv; |
| } Udata; |
| |
| |
| |
| |
| /* |
| ** Function Prototypes |
| */ |
| typedef struct Proto { |
| CommonHeader; |
| TObject *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; |
| GCObject *gclist; |
| lu_byte nups; /* number of upvalues */ |
| lu_byte numparams; |
| lu_byte is_vararg; |
| lu_byte maxstacksize; |
| } Proto; |
| |
| |
| 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; |
| TObject *v; /* points to stack or to its own value */ |
| TObject value; /* the value (when closed) */ |
| } UpVal; |
| |
| |
| /* |
| ** Closures |
| */ |
| |
| #define ClosureHeader \ |
| CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist |
| |
| typedef struct CClosure { |
| ClosureHeader; |
| lua_CFunction f; |
| TObject upvalue[1]; |
| } CClosure; |
| |
| |
| typedef struct LClosure { |
| ClosureHeader; |
| struct Proto *p; |
| TObject g; /* global table for this closure */ |
| 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 struct Node { |
| TObject i_key; |
| TObject i_val; |
| struct Node *next; /* for chaining */ |
| } 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; |
| TObject *array; /* array part */ |
| Node *node; |
| Node *firstfree; /* this position is free; all positions after it are full */ |
| GCObject *gclist; |
| int sizearray; /* size of `array' array */ |
| } 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)) |
| |
| |
| |
| extern const TObject luaO_nilobject; |
| |
| int luaO_log2 (unsigned int x); |
| int luaO_int2fb (unsigned int x); |
| #define fb2int(x) (((x) & 7) << ((x) >> 3)) |
| |
| int luaO_rawequalObj (const TObject *t1, const TObject *t2); |
| int luaO_str2d (const char *s, lua_Number *result); |
| |
| const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp); |
| const char *luaO_pushfstring (lua_State *L, const char *fmt, ...); |
| void luaO_chunkid (char *out, const char *source, int len); |
| |
| |
| #endif |