0,0 → 1,419 |
/* |
** $Id: lobject.h,v 2.42 2010/07/26 15:53:23 roberto Exp $ |
** Type definitions for Lua objects |
** See Copyright Notice in lua.h |
*/ |
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#ifndef lobject_h |
#define lobject_h |
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#include <stdarg.h> |
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#include "llimits.h" |
#include "lua.h" |
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/* |
** Extra tags for non-values |
*/ |
#define LUA_TPROTO LUA_NUMTAGS |
#define LUA_TUPVAL (LUA_NUMTAGS+1) |
#define LUA_TDEADKEY (LUA_NUMTAGS+2) |
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/* |
** Variant tag for light C functions (negative to be considered |
** non collectable by 'iscollectable') |
*/ |
#define LUA_TLCF (~0x0F | LUA_TFUNCTION) |
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/* |
** Union of all collectable objects |
*/ |
typedef union GCObject GCObject; |
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/* |
** 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 |
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/* |
** Common header in struct form |
*/ |
typedef struct GCheader { |
CommonHeader; |
} GCheader; |
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/* |
** Union of all Lua values |
*/ |
typedef union { |
GCObject *gc; /* collectable objects */ |
void *p; /* light userdata */ |
lua_Number n; /* numbers */ |
int b; /* booleans */ |
lua_CFunction f; /* light C functions */ |
} Value; |
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/* |
** Tagged Values. This is the basic representation of values in Lua, |
** an actual value plus a tag with its type. |
*/ |
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#define TValuefields Value value_; int tt_ |
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typedef struct lua_TValue { |
TValuefields; |
} TValue; |
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/* macro defining a nil value */ |
#define NILCONSTANT {NULL}, LUA_TNIL |
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/* |
** type tag of a TValue |
*/ |
#define ttype(o) ((o)->tt_) |
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/* |
** type tag of a TValue with no variants |
*/ |
#define ttypenv(o) (ttype(o) & 0x0F) |
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/* 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) (ttypenv(o) == LUA_TFUNCTION) |
#define ttisclosure(o) (ttype(o) == LUA_TFUNCTION) |
#define ttislcf(o) (ttype(o) == LUA_TLCF) |
#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) |
#define ttisdeadkey(o) (ttype(o) == LUA_TDEADKEY) |
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/* Macros to access values */ |
#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(ttisclosure(o), &(o)->value_.gc->cl) |
#define fvalue(o) check_exp(ttislcf(o), (o)->value_.f) |
#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) |
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#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0)) |
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#define iscollectable(o) (ttype(o) >= LUA_TSTRING) |
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/* Macros for internal tests */ |
#define righttt(obj) (ttype(obj) == gcvalue(obj)->gch.tt) |
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#define checkconsistency(obj) lua_assert(!iscollectable(obj) || righttt(obj)) |
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#define checkliveness(g,obj) \ |
lua_assert(!iscollectable(obj) || (righttt(obj) && !isdead(g,gcvalue(obj)))) |
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/* Macros to set values */ |
#define setnilvalue(obj) ((obj)->tt_=LUA_TNIL) |
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#define setnvalue(obj,x) \ |
{ TValue *i_o=(obj); i_o->value_.n=(x); i_o->tt_=LUA_TNUMBER; } |
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#define setfvalue(obj,x) \ |
{ TValue *i_o=(obj); i_o->value_.f=(x); i_o->tt_=LUA_TLCF; } |
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#define changenvalue(o,x) check_exp((o)->tt_==LUA_TNUMBER, (o)->value_.n=(x)) |
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#define setpvalue(obj,x) \ |
{ TValue *i_o=(obj); i_o->value_.p=(x); i_o->tt_=LUA_TLIGHTUSERDATA; } |
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#define setbvalue(obj,x) \ |
{ TValue *i_o=(obj); i_o->value_.b=(x); i_o->tt_=LUA_TBOOLEAN; } |
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#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); } |
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#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); } |
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#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); } |
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#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); } |
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#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); } |
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#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); } |
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#define setdeadvalue(obj) ((obj)->tt_=LUA_TDEADKEY) |
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#define setobj(L,obj1,obj2) \ |
{ const TValue *o2=(obj2); TValue *o1=(obj1); \ |
o1->value_ = o2->value_; o1->tt_=o2->tt_; \ |
checkliveness(G(L),o1); } |
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/* |
** different types of assignments, according to destination |
*/ |
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/* 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 |
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typedef TValue *StkId; /* index to stack elements */ |
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/* |
** Header for string value; string bytes follow the end of this structure |
*/ |
typedef union TString { |
L_Umaxalign dummy; /* ensures maximum alignment for strings */ |
struct { |
CommonHeader; |
lu_byte reserved; |
unsigned int hash; |
size_t len; |
} tsv; |
} TString; |
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/* get the actual string (array of bytes) from a TString */ |
#define getstr(ts) cast(const char *, (ts) + 1) |
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/* get the actual string (array of bytes) from a Lua value */ |
#define svalue(o) getstr(rawtsvalue(o)) |
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/* |
** Header for userdata; memory area follows the end of this structure |
*/ |
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; |
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/* |
** Description of an upvalue for function prototypes |
*/ |
typedef struct Upvaldesc { |
TString *name; /* upvalue name (for debug information) */ |
lu_byte instack; /* whether it is in stack */ |
lu_byte idx; /* index of upvalue (in stack or in outer function's list) */ |
} Upvaldesc; |
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/* |
** Description of a local variable for function prototypes |
** (used for debug information) |
*/ |
typedef struct LocVar { |
TString *varname; |
int startpc; /* first point where variable is active */ |
int endpc; /* first point where variable is dead */ |
} LocVar; |
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/* |
** 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 */ |
LocVar *locvars; /* information about local variables */ |
Upvaldesc *upvalues; /* upvalue information */ |
union Closure *cache; /* last created closure with this prototype */ |
TString *source; |
int sizeupvalues; /* size of 'upvalues' */ |
int sizek; /* size of `k' */ |
int sizecode; |
int sizelineinfo; |
int sizep; /* size of `p' */ |
int sizelocvars; |
int linedefined; |
int lastlinedefined; |
GCObject *gclist; |
lu_byte numparams; /* number of fixed parameters */ |
lu_byte is_vararg; |
lu_byte maxstacksize; /* maximum stack used by this function */ |
} Proto; |
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/* |
** Lua 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; |
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/* |
** Closures |
*/ |
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#define ClosureHeader \ |
CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist |
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typedef struct CClosure { |
ClosureHeader; |
lua_CFunction f; |
TValue upvalue[1]; /* list of upvalues */ |
} CClosure; |
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typedef struct LClosure { |
ClosureHeader; |
struct Proto *p; |
UpVal *upvals[1]; /* list of upvalues */ |
} LClosure; |
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typedef union Closure { |
CClosure c; |
LClosure l; |
} Closure; |
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#define isLfunction(o) (ttisclosure(o) && !clvalue(o)->c.isC) |
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#define getproto(o) (clvalue(o)->l.p) |
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/* |
** Tables |
*/ |
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typedef union TKey { |
struct { |
TValuefields; |
struct Node *next; /* for chaining */ |
} nk; |
TValue tvk; |
} TKey; |
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typedef struct Node { |
TValue i_val; |
TKey i_key; |
} Node; |
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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 */ |
} Table; |
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/* |
** `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))))) |
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#define twoto(x) (1<<(x)) |
#define sizenode(t) (twoto((t)->lsizenode)) |
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/* |
** (address of) a fixed nil value |
*/ |
#define luaO_nilobject (&luaO_nilobject_) |
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LUAI_DDEC const TValue luaO_nilobject_; |
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LUAI_FUNC int luaO_int2fb (unsigned int x); |
LUAI_FUNC int luaO_fb2int (int x); |
LUAI_FUNC int luaO_ceillog2 (lu_int32 x); |
LUAI_FUNC lua_Number luaO_arith (int op, lua_Number v1, lua_Number v2); |
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); |
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#endif |
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