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1/*
2** $Id: lobject.h,v 2.20 2006/01/18 11:37:34 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_TAGLUA_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 CommonHeaderGCObject *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 TValuefieldsValue 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 setobjs2ssetobj
173/* to stack (not from same stack) */
174#define setobj2ssetobj
175#define setsvalue2ssetsvalue
176#define sethvalue2ssethvalue
177#define setptvalue2ssetptvalue
178/* from table to same table */
179#define setobjt2tsetobj
180/* to table */
181#define setobj2tsetobj
182/* to new object */
183#define setobj2nsetobj
184#define setsvalue2nsetsvalue
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(tsvalue(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_HASARG1
258#define VARARG_ISVARARG2
259#define VARARG_NEEDSARG4
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 \
292CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist; \
293struct 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

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