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| 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 |
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