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1 /*
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2 ** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
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3 ** Global State
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7 #ifndef lstate_h
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8 #define lstate_h
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9
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10 #include "lua.h"
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11
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12 #include "lobject.h"
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13 #include "ltm.h"
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14 #include "lzio.h"
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15
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16
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17
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18 struct lua_longjmp; /* defined in ldo.c */
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19
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20
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21 /* table of globals */
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22 #define gt(L) (&L->l_gt)
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23
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24 /* registry */
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25 #define registry(L) (&G(L)->l_registry)
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26
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27
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28 /* extra stack space to handle TM calls and some other extras */
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29 #define EXTRA_STACK 5
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30
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31
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32 #define BASIC_CI_SIZE 8
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33
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34 #define BASIC_STACK_SIZE (2*LUA_MINSTACK)
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35
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36
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37
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38 typedef struct stringtable {
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39 GCObject **hash;
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40 lu_int32 nuse; /* number of elements */
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41 int size;
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42 } stringtable;
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43
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44
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45 /*
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46 ** informations about a call
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47 */
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48 typedef struct CallInfo {
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49 StkId base; /* base for this function */
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50 StkId func; /* function index in the stack */
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51 StkId top; /* top for this function */
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52 const Instruction *savedpc;
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53 int nresults; /* expected number of results from this function */
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54 int tailcalls; /* number of tail calls lost under this entry */
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55 } CallInfo;
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56
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57
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58
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59 #define curr_func(L) (clvalue(L->ci->func))
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60 #define ci_func(ci) (clvalue((ci)->func))
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61 #define f_isLua(ci) (!ci_func(ci)->c.isC)
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62 #define isLua(ci) (ttisfunction((ci)->func) && f_isLua(ci))
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63
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64
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65 /*
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66 ** `global state', shared by all threads of this state
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67 */
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68 typedef struct global_State {
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69 stringtable strt; /* hash table for strings */
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70 lua_Alloc frealloc; /* function to reallocate memory */
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71 void *ud; /* auxiliary data to `frealloc' */
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72 lu_byte currentwhite;
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73 lu_byte gcstate; /* state of garbage collector */
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74 int sweepstrgc; /* position of sweep in `strt' */
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75 GCObject *rootgc; /* list of all collectable objects */
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76 GCObject **sweepgc; /* position of sweep in `rootgc' */
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77 GCObject *gray; /* list of gray objects */
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78 GCObject *grayagain; /* list of objects to be traversed atomically */
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79 GCObject *weak; /* list of weak tables (to be cleared) */
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80 GCObject *tmudata; /* last element of list of userdata to be GC */
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81 Mbuffer buff; /* temporary buffer for string concatentation */
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82 lu_mem GCthreshold;
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83 lu_mem totalbytes; /* number of bytes currently allocated */
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84 lu_mem estimate; /* an estimate of number of bytes actually in use */
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85 lu_mem gcdept; /* how much GC is `behind schedule' */
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86 int gcpause; /* size of pause between successive GCs */
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87 int gcstepmul; /* GC `granularity' */
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88 lua_CFunction panic; /* to be called in unprotected errors */
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89 TValue l_registry;
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90 struct lua_State *mainthread;
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91 UpVal uvhead; /* head of double-linked list of all open upvalues */
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92 struct Table *mt[NUM_TAGS]; /* metatables for basic types */
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93 TString *tmname[TM_N]; /* array with tag-method names */
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94 } global_State;
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95
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96
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97 /*
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98 ** `per thread' state
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99 */
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100 struct lua_State {
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101 CommonHeader;
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102 lu_byte status;
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103 StkId top; /* first free slot in the stack */
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104 StkId base; /* base of current function */
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105 global_State *l_G;
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106 CallInfo *ci; /* call info for current function */
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107 const Instruction *savedpc; /* `savedpc' of current function */
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108 StkId stack_last; /* last free slot in the stack */
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109 StkId stack; /* stack base */
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110 CallInfo *end_ci; /* points after end of ci array*/
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111 CallInfo *base_ci; /* array of CallInfo's */
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112 int stacksize;
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113 int size_ci; /* size of array `base_ci' */
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114 unsigned short nCcalls; /* number of nested C calls */
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115 unsigned short baseCcalls; /* nested C calls when resuming coroutine */
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116 lu_byte hookmask;
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117 lu_byte allowhook;
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118 int basehookcount;
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119 int hookcount;
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120 lua_Hook hook;
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121 TValue l_gt; /* table of globals */
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122 TValue env; /* temporary place for environments */
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123 GCObject *openupval; /* list of open upvalues in this stack */
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124 GCObject *gclist;
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125 struct lua_longjmp *errorJmp; /* current error recover point */
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126 ptrdiff_t errfunc; /* current error handling function (stack index) */
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127 };
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128
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129
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130 #define G(L) (L->l_G)
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131
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132
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133 /*
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134 ** Union of all collectable objects
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135 */
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136 union GCObject {
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137 GCheader gch;
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138 union TString ts;
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139 union Udata u;
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140 union Closure cl;
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141 struct Table h;
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142 struct Proto p;
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143 struct UpVal uv;
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144 struct lua_State th; /* thread */
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145 };
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146
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147
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148 /* macros to convert a GCObject into a specific value */
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149 #define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
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150 #define gco2ts(o) (&rawgco2ts(o)->tsv)
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151 #define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
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152 #define gco2u(o) (&rawgco2u(o)->uv)
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153 #define gco2cl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
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154 #define gco2h(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
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155 #define gco2p(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
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156 #define gco2uv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
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157 #define ngcotouv(o) \
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158 check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
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159 #define gco2th(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
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160
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161 /* macro to convert any Lua object into a GCObject */
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162 #define obj2gco(v) (cast(GCObject *, (v)))
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163
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164
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165 LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
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166 LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
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167
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168 #endif
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169
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