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comparison lib/lua/lua-5.2.2/lstate.h @ 1866:41cc4dd3c122

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Lua 5.2.2 added.
author Nomad
date Wed, 16 Oct 2013 13:34:26 +0200
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1848:3b39b70e8e93 1866:41cc4dd3c122
1 /*
2 ** $Id: lstate.h,v 2.82 2012/07/02 13:37:04 roberto Exp $
3 ** Global State
4 ** See Copyright Notice in lua.h
5 */
6
7 #ifndef lstate_h
8 #define lstate_h
9
10 #include "lua.h"
11
12 #include "lobject.h"
13 #include "ltm.h"
14 #include "lzio.h"
15
16
17 /*
18
19 ** Some notes about garbage-collected objects: All objects in Lua must
20 ** be kept somehow accessible until being freed.
21 **
22 ** Lua keeps most objects linked in list g->allgc. The link uses field
23 ** 'next' of the CommonHeader.
24 **
25 ** Strings are kept in several lists headed by the array g->strt.hash.
26 **
27 ** Open upvalues are not subject to independent garbage collection. They
28 ** are collected together with their respective threads. Lua keeps a
29 ** double-linked list with all open upvalues (g->uvhead) so that it can
30 ** mark objects referred by them. (They are always gray, so they must
31 ** be remarked in the atomic step. Usually their contents would be marked
32 ** when traversing the respective threads, but the thread may already be
33 ** dead, while the upvalue is still accessible through closures.)
34 **
35 ** Objects with finalizers are kept in the list g->finobj.
36 **
37 ** The list g->tobefnz links all objects being finalized.
38
39 */
40
41
42 struct lua_longjmp; /* defined in ldo.c */
43
44
45
46 /* extra stack space to handle TM calls and some other extras */
47 #define EXTRA_STACK 5
48
49
50 #define BASIC_STACK_SIZE (2*LUA_MINSTACK)
51
52
53 /* kinds of Garbage Collection */
54 #define KGC_NORMAL 0
55 #define KGC_EMERGENCY 1 /* gc was forced by an allocation failure */
56 #define KGC_GEN 2 /* generational collection */
57
58
59 typedef struct stringtable {
60 GCObject **hash;
61 lu_int32 nuse; /* number of elements */
62 int size;
63 } stringtable;
64
65
66 /*
67 ** information about a call
68 */
69 typedef struct CallInfo {
70 StkId func; /* function index in the stack */
71 StkId top; /* top for this function */
72 struct CallInfo *previous, *next; /* dynamic call link */
73 short nresults; /* expected number of results from this function */
74 lu_byte callstatus;
75 ptrdiff_t extra;
76 union {
77 struct { /* only for Lua functions */
78 StkId base; /* base for this function */
79 const Instruction *savedpc;
80 } l;
81 struct { /* only for C functions */
82 int ctx; /* context info. in case of yields */
83 lua_CFunction k; /* continuation in case of yields */
84 ptrdiff_t old_errfunc;
85 lu_byte old_allowhook;
86 lu_byte status;
87 } c;
88 } u;
89 } CallInfo;
90
91
92 /*
93 ** Bits in CallInfo status
94 */
95 #define CIST_LUA (1<<0) /* call is running a Lua function */
96 #define CIST_HOOKED (1<<1) /* call is running a debug hook */
97 #define CIST_REENTRY (1<<2) /* call is running on same invocation of
98 luaV_execute of previous call */
99 #define CIST_YIELDED (1<<3) /* call reentered after suspension */
100 #define CIST_YPCALL (1<<4) /* call is a yieldable protected call */
101 #define CIST_STAT (1<<5) /* call has an error status (pcall) */
102 #define CIST_TAIL (1<<6) /* call was tail called */
103 #define CIST_HOOKYIELD (1<<7) /* last hook called yielded */
104
105
106 #define isLua(ci) ((ci)->callstatus & CIST_LUA)
107
108
109 /*
110 ** `global state', shared by all threads of this state
111 */
112 typedef struct global_State {
113 lua_Alloc frealloc; /* function to reallocate memory */
114 void *ud; /* auxiliary data to `frealloc' */
115 lu_mem totalbytes; /* number of bytes currently allocated - GCdebt */
116 l_mem GCdebt; /* bytes allocated not yet compensated by the collector */
117 lu_mem GCmemtrav; /* memory traversed by the GC */
118 lu_mem GCestimate; /* an estimate of the non-garbage memory in use */
119 stringtable strt; /* hash table for strings */
120 TValue l_registry;
121 unsigned int seed; /* randomized seed for hashes */
122 lu_byte currentwhite;
123 lu_byte gcstate; /* state of garbage collector */
124 lu_byte gckind; /* kind of GC running */
125 lu_byte gcrunning; /* true if GC is running */
126 int sweepstrgc; /* position of sweep in `strt' */
127 GCObject *allgc; /* list of all collectable objects */
128 GCObject *finobj; /* list of collectable objects with finalizers */
129 GCObject **sweepgc; /* current position of sweep in list 'allgc' */
130 GCObject **sweepfin; /* current position of sweep in list 'finobj' */
131 GCObject *gray; /* list of gray objects */
132 GCObject *grayagain; /* list of objects to be traversed atomically */
133 GCObject *weak; /* list of tables with weak values */
134 GCObject *ephemeron; /* list of ephemeron tables (weak keys) */
135 GCObject *allweak; /* list of all-weak tables */
136 GCObject *tobefnz; /* list of userdata to be GC */
137 UpVal uvhead; /* head of double-linked list of all open upvalues */
138 Mbuffer buff; /* temporary buffer for string concatenation */
139 int gcpause; /* size of pause between successive GCs */
140 int gcmajorinc; /* pause between major collections (only in gen. mode) */
141 int gcstepmul; /* GC `granularity' */
142 lua_CFunction panic; /* to be called in unprotected errors */
143 struct lua_State *mainthread;
144 const lua_Number *version; /* pointer to version number */
145 TString *memerrmsg; /* memory-error message */
146 TString *tmname[TM_N]; /* array with tag-method names */
147 struct Table *mt[LUA_NUMTAGS]; /* metatables for basic types */
148 } global_State;
149
150
151 /*
152 ** `per thread' state
153 */
154 struct lua_State {
155 CommonHeader;
156 lu_byte status;
157 StkId top; /* first free slot in the stack */
158 global_State *l_G;
159 CallInfo *ci; /* call info for current function */
160 const Instruction *oldpc; /* last pc traced */
161 StkId stack_last; /* last free slot in the stack */
162 StkId stack; /* stack base */
163 int stacksize;
164 unsigned short nny; /* number of non-yieldable calls in stack */
165 unsigned short nCcalls; /* number of nested C calls */
166 lu_byte hookmask;
167 lu_byte allowhook;
168 int basehookcount;
169 int hookcount;
170 lua_Hook hook;
171 GCObject *openupval; /* list of open upvalues in this stack */
172 GCObject *gclist;
173 struct lua_longjmp *errorJmp; /* current error recover point */
174 ptrdiff_t errfunc; /* current error handling function (stack index) */
175 CallInfo base_ci; /* CallInfo for first level (C calling Lua) */
176 };
177
178
179 #define G(L) (L->l_G)
180
181
182 /*
183 ** Union of all collectable objects
184 */
185 union GCObject {
186 GCheader gch; /* common header */
187 union TString ts;
188 union Udata u;
189 union Closure cl;
190 struct Table h;
191 struct Proto p;
192 struct UpVal uv;
193 struct lua_State th; /* thread */
194 };
195
196
197 #define gch(o) (&(o)->gch)
198
199 /* macros to convert a GCObject into a specific value */
200 #define rawgco2ts(o) \
201 check_exp(novariant((o)->gch.tt) == LUA_TSTRING, &((o)->ts))
202 #define gco2ts(o) (&rawgco2ts(o)->tsv)
203 #define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
204 #define gco2u(o) (&rawgco2u(o)->uv)
205 #define gco2lcl(o) check_exp((o)->gch.tt == LUA_TLCL, &((o)->cl.l))
206 #define gco2ccl(o) check_exp((o)->gch.tt == LUA_TCCL, &((o)->cl.c))
207 #define gco2cl(o) \
208 check_exp(novariant((o)->gch.tt) == LUA_TFUNCTION, &((o)->cl))
209 #define gco2t(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
210 #define gco2p(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
211 #define gco2uv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
212 #define gco2th(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
213
214 /* macro to convert any Lua object into a GCObject */
215 #define obj2gco(v) (cast(GCObject *, (v)))
216
217
218 /* actual number of total bytes allocated */
219 #define gettotalbytes(g) ((g)->totalbytes + (g)->GCdebt)
220
221 LUAI_FUNC void luaE_setdebt (global_State *g, l_mem debt);
222 LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
223 LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L);
224 LUAI_FUNC void luaE_freeCI (lua_State *L);
225
226
227 #endif
228