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/script_binding/lua/lua/lobject.h

http://ftk.googlecode.com/
C++ Header | 381 lines | 219 code | 104 blank | 58 comment | 21 complexity | 5d4be69f06b6832adf6d94a84cfdc58b MD5 | raw file
  1/*
  2** $Id: lobject.h,v 2.20.1.2 2008/08/06 13:29:48 roberto Exp $
  3** Type definitions for Lua objects
  4** See Copyright Notice in lua.h
  5*/
  6
  7
  8#ifndef lobject_h
  9#define lobject_h
 10
 11
 12#include <stdarg.h>
 13
 14
 15#include "llimits.h"
 16#include "lua.h"
 17
 18
 19/* tags for values visible from Lua */
 20#define LAST_TAG	LUA_TTHREAD
 21
 22#define NUM_TAGS	(LAST_TAG+1)
 23
 24
 25/*
 26** Extra tags for non-values
 27*/
 28#define LUA_TPROTO	(LAST_TAG+1)
 29#define LUA_TUPVAL	(LAST_TAG+2)
 30#define LUA_TDEADKEY	(LAST_TAG+3)
 31
 32
 33/*
 34** Union of all collectable objects
 35*/
 36typedef union GCObject GCObject;
 37
 38
 39/*
 40** Common Header for all collectable objects (in macro form, to be
 41** included in other objects)
 42*/
 43#define CommonHeader	GCObject *next; lu_byte tt; lu_byte marked
 44
 45
 46/*
 47** Common header in struct form
 48*/
 49typedef struct GCheader {
 50  CommonHeader;
 51} GCheader;
 52
 53
 54
 55
 56/*
 57** Union of all Lua values
 58*/
 59typedef union {
 60  GCObject *gc;
 61  void *p;
 62  lua_Number n;
 63  int b;
 64} Value;
 65
 66
 67/*
 68** Tagged Values
 69*/
 70
 71#define TValuefields	Value value; int tt
 72
 73typedef struct lua_TValue {
 74  TValuefields;
 75} TValue;
 76
 77
 78/* Macros to test type */
 79#define ttisnil(o)	(ttype(o) == LUA_TNIL)
 80#define ttisnumber(o)	(ttype(o) == LUA_TNUMBER)
 81#define ttisstring(o)	(ttype(o) == LUA_TSTRING)
 82#define ttistable(o)	(ttype(o) == LUA_TTABLE)
 83#define ttisfunction(o)	(ttype(o) == LUA_TFUNCTION)
 84#define ttisboolean(o)	(ttype(o) == LUA_TBOOLEAN)
 85#define ttisuserdata(o)	(ttype(o) == LUA_TUSERDATA)
 86#define ttisthread(o)	(ttype(o) == LUA_TTHREAD)
 87#define ttislightuserdata(o)	(ttype(o) == LUA_TLIGHTUSERDATA)
 88
 89/* Macros to access values */
 90#define ttype(o)	((o)->tt)
 91#define gcvalue(o)	check_exp(iscollectable(o), (o)->value.gc)
 92#define pvalue(o)	check_exp(ttislightuserdata(o), (o)->value.p)
 93#define nvalue(o)	check_exp(ttisnumber(o), (o)->value.n)
 94#define rawtsvalue(o)	check_exp(ttisstring(o), &(o)->value.gc->ts)
 95#define tsvalue(o)	(&rawtsvalue(o)->tsv)
 96#define rawuvalue(o)	check_exp(ttisuserdata(o), &(o)->value.gc->u)
 97#define uvalue(o)	(&rawuvalue(o)->uv)
 98#define clvalue(o)	check_exp(ttisfunction(o), &(o)->value.gc->cl)
 99#define hvalue(o)	check_exp(ttistable(o), &(o)->value.gc->h)
100#define bvalue(o)	check_exp(ttisboolean(o), (o)->value.b)
101#define thvalue(o)	check_exp(ttisthread(o), &(o)->value.gc->th)
102
103#define l_isfalse(o)	(ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
104
105/*
106** for internal debug only
107*/
108#define checkconsistency(obj) \
109  lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
110
111#define checkliveness(g,obj) \
112  lua_assert(!iscollectable(obj) || \
113  ((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc)))
114
115
116/* Macros to set values */
117#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
118
119#define setnvalue(obj,x) \
120  { TValue *i_o=(obj); i_o->value.n=(x); i_o->tt=LUA_TNUMBER; }
121
122#define setpvalue(obj,x) \
123  { TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
124
125#define setbvalue(obj,x) \
126  { TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
127
128#define setsvalue(L,obj,x) \
129  { TValue *i_o=(obj); \
130    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING; \
131    checkliveness(G(L),i_o); }
132
133#define setuvalue(L,obj,x) \
134  { TValue *i_o=(obj); \
135    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA; \
136    checkliveness(G(L),i_o); }
137
138#define setthvalue(L,obj,x) \
139  { TValue *i_o=(obj); \
140    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD; \
141    checkliveness(G(L),i_o); }
142
143#define setclvalue(L,obj,x) \
144  { TValue *i_o=(obj); \
145    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TFUNCTION; \
146    checkliveness(G(L),i_o); }
147
148#define sethvalue(L,obj,x) \
149  { TValue *i_o=(obj); \
150    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE; \
151    checkliveness(G(L),i_o); }
152
153#define setptvalue(L,obj,x) \
154  { TValue *i_o=(obj); \
155    i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TPROTO; \
156    checkliveness(G(L),i_o); }
157
158
159
160
161#define setobj(L,obj1,obj2) \
162  { const TValue *o2=(obj2); TValue *o1=(obj1); \
163    o1->value = o2->value; o1->tt=o2->tt; \
164    checkliveness(G(L),o1); }
165
166
167/*
168** different types of sets, according to destination
169*/
170
171/* from stack to (same) stack */
172#define setobjs2s	setobj
173/* to stack (not from same stack) */
174#define setobj2s	setobj
175#define setsvalue2s	setsvalue
176#define sethvalue2s	sethvalue
177#define setptvalue2s	setptvalue
178/* from table to same table */
179#define setobjt2t	setobj
180/* to table */
181#define setobj2t	setobj
182/* to new object */
183#define setobj2n	setobj
184#define setsvalue2n	setsvalue
185
186#define setttype(obj, tt) (ttype(obj) = (tt))
187
188
189#define iscollectable(o)	(ttype(o) >= LUA_TSTRING)
190
191
192
193typedef TValue *StkId;  /* index to stack elements */
194
195
196/*
197** String headers for string table
198*/
199typedef union TString {
200  L_Umaxalign dummy;  /* ensures maximum alignment for strings */
201  struct {
202    CommonHeader;
203    lu_byte reserved;
204    unsigned int hash;
205    size_t len;
206  } tsv;
207} TString;
208
209
210#define getstr(ts)	cast(const char *, (ts) + 1)
211#define svalue(o)       getstr(rawtsvalue(o))
212
213
214
215typedef union Udata {
216  L_Umaxalign dummy;  /* ensures maximum alignment for `local' udata */
217  struct {
218    CommonHeader;
219    struct Table *metatable;
220    struct Table *env;
221    size_t len;
222  } uv;
223} Udata;
224
225
226
227
228/*
229** Function Prototypes
230*/
231typedef struct Proto {
232  CommonHeader;
233  TValue *k;  /* constants used by the function */
234  Instruction *code;
235  struct Proto **p;  /* functions defined inside the function */
236  int *lineinfo;  /* map from opcodes to source lines */
237  struct LocVar *locvars;  /* information about local variables */
238  TString **upvalues;  /* upvalue names */
239  TString  *source;
240  int sizeupvalues;
241  int sizek;  /* size of `k' */
242  int sizecode;
243  int sizelineinfo;
244  int sizep;  /* size of `p' */
245  int sizelocvars;
246  int linedefined;
247  int lastlinedefined;
248  GCObject *gclist;
249  lu_byte nups;  /* number of upvalues */
250  lu_byte numparams;
251  lu_byte is_vararg;
252  lu_byte maxstacksize;
253} Proto;
254
255
256/* masks for new-style vararg */
257#define VARARG_HASARG		1
258#define VARARG_ISVARARG		2
259#define VARARG_NEEDSARG		4
260
261
262typedef struct LocVar {
263  TString *varname;
264  int startpc;  /* first point where variable is active */
265  int endpc;    /* first point where variable is dead */
266} LocVar;
267
268
269
270/*
271** Upvalues
272*/
273
274typedef struct UpVal {
275  CommonHeader;
276  TValue *v;  /* points to stack or to its own value */
277  union {
278    TValue value;  /* the value (when closed) */
279    struct {  /* double linked list (when open) */
280      struct UpVal *prev;
281      struct UpVal *next;
282    } l;
283  } u;
284} UpVal;
285
286
287/*
288** Closures
289*/
290
291#define ClosureHeader \
292	CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist; \
293	struct Table *env
294
295typedef struct CClosure {
296  ClosureHeader;
297  lua_CFunction f;
298  TValue upvalue[1];
299} CClosure;
300
301
302typedef struct LClosure {
303  ClosureHeader;
304  struct Proto *p;
305  UpVal *upvals[1];
306} LClosure;
307
308
309typedef union Closure {
310  CClosure c;
311  LClosure l;
312} Closure;
313
314
315#define iscfunction(o)	(ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
316#define isLfunction(o)	(ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
317
318
319/*
320** Tables
321*/
322
323typedef union TKey {
324  struct {
325    TValuefields;
326    struct Node *next;  /* for chaining */
327  } nk;
328  TValue tvk;
329} TKey;
330
331
332typedef struct Node {
333  TValue i_val;
334  TKey i_key;
335} Node;
336
337
338typedef struct Table {
339  CommonHeader;
340  lu_byte flags;  /* 1<<p means tagmethod(p) is not present */ 
341  lu_byte lsizenode;  /* log2 of size of `node' array */
342  struct Table *metatable;
343  TValue *array;  /* array part */
344  Node *node;
345  Node *lastfree;  /* any free position is before this position */
346  GCObject *gclist;
347  int sizearray;  /* size of `array' array */
348} Table;
349
350
351
352/*
353** `module' operation for hashing (size is always a power of 2)
354*/
355#define lmod(s,size) \
356	(check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1)))))
357
358
359#define twoto(x)	(1<<(x))
360#define sizenode(t)	(twoto((t)->lsizenode))
361
362
363#define luaO_nilobject		(&luaO_nilobject_)
364
365LUAI_DATA const TValue luaO_nilobject_;
366
367#define ceillog2(x)	(luaO_log2((x)-1) + 1)
368
369LUAI_FUNC int luaO_log2 (unsigned int x);
370LUAI_FUNC int luaO_int2fb (unsigned int x);
371LUAI_FUNC int luaO_fb2int (int x);
372LUAI_FUNC int luaO_rawequalObj (const TValue *t1, const TValue *t2);
373LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result);
374LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
375                                                       va_list argp);
376LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
377LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t len);
378
379
380#endif
381