lua-5.1.1中的lua_State的实现

lstate.c

static void stack_init (lua_State *L1, lua_State *L) {
  /* initialize CallInfo array */
  L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
  L1->ci = L1->base_ci;
  L1->size_ci = BASIC_CI_SIZE;
  L1->end_ci = L1->base_ci + L1->size_ci - 1;
  /* initialize stack array */
  L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
  L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
  L1->top = L1->stack;
  L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
  /* initialize first ci */
  L1->ci->func = L1->top;
  setnilvalue(L1->top++);  /* `function' entry for this `ci' */
  L1->base = L1->ci->base = L1->top;
  L1->ci->top = L1->top + LUA_MINSTACK;
}

lstate.h

/*
** `per thread' state
*/
struct lua_State {
  CommonHeader;
  lu_byte status;
  StkId top;  /* first free slot in the stack */
  StkId base;  /* base of current function */
  global_State *l_G;
  CallInfo *ci;  /* call info for current function */
  const Instruction *savedpc;  /* `savedpc' of current function */
  StkId stack_last;  /* last free slot in the stack */
  StkId stack;  /* stack base */
  CallInfo *end_ci;  /* points after end of ci array*/
  CallInfo *base_ci;  /* array of CallInfo's */
  int stacksize;
  int size_ci;  /* size of array `base_ci' */
  unsigned short nCcalls;  /* number of nested C calls */
  lu_byte hookmask;
  lu_byte allowhook;
  int basehookcount;
  int hookcount;
  lua_Hook hook;
  TValue l_gt;  /* table of globals */
  TValue env;  /* temporary place for environments */
  GCObject *openupval;  /* list of open upvalues in this stack */
  GCObject *gclist;
  struct lua_longjmp *errorJmp;  /* current error recover point */
  ptrdiff_t errfunc;  /* current error handling function (stack index) */
};

/*
** informations about a call
*/
typedef struct CallInfo {
  StkId base;  /* base for this function */
  StkId func;  /* function index in the stack */
  StkId	top;  /* top for this function */
  const Instruction *savedpc;
  int nresults;  /* expected number of results from this function */
  int tailcalls;  /* number of tail calls lost under this entry */
} CallInfo;

lstate.md

lstate

这是从lua-5.1.1中分离出来的lua_State实现代码。

关于lua State

lua state