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@ -1,5 +1,5 @@
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/*
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** $Id: ldo.c,v 2.151 2015/12/16 16:40:07 roberto Exp $
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** $Id: ldo.c,v 2.155 2016/09/08 16:36:26 roberto Exp roberto $
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** Stack and Call structure of Lua
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** See Copyright Notice in lua.h
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*/
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@ -211,9 +211,9 @@ static int stackinuse (lua_State *L) {
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CallInfo *ci;
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StkId lim = L->top;
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for (ci = L->ci; ci != NULL; ci = ci->previous) {
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lua_assert(ci->top <= L->stack_last);
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if (lim < ci->top) lim = ci->top;
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}
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lua_assert(lim <= L->stack_last);
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return cast_int(lim - L->stack) + 1; /* part of stack in use */
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}
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@ -221,16 +221,19 @@ static int stackinuse (lua_State *L) {
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void luaD_shrinkstack (lua_State *L) {
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int inuse = stackinuse(L);
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int goodsize = inuse + (inuse / 8) + 2*EXTRA_STACK;
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if (goodsize > LUAI_MAXSTACK) goodsize = LUAI_MAXSTACK;
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if (L->stacksize > LUAI_MAXSTACK) /* was handling stack overflow? */
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if (goodsize > LUAI_MAXSTACK)
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goodsize = LUAI_MAXSTACK; /* respect stack limit */
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if (L->stacksize > LUAI_MAXSTACK) /* had been handling stack overflow? */
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luaE_freeCI(L); /* free all CIs (list grew because of an error) */
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else
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luaE_shrinkCI(L); /* shrink list */
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if (inuse <= LUAI_MAXSTACK && /* not handling stack overflow? */
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goodsize < L->stacksize) /* trying to shrink? */
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luaD_reallocstack(L, goodsize); /* shrink it */
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else
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condmovestack(L,,); /* don't change stack (change only for debugging) */
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/* if thread is currently not handling a stack overflow and its
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good size is smaller than current size, shrink its stack */
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if (inuse <= (LUAI_MAXSTACK - EXTRA_STACK) &&
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goodsize < L->stacksize)
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luaD_reallocstack(L, goodsize);
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else /* don't change stack */
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condmovestack(L,{},{}); /* (change only for debugging) */
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}
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@ -376,13 +379,13 @@ int luaD_precall (lua_State *L, StkId func, int nresults, int op_call) {
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int n = cast_int(L->top - func) - 1; /* number of real arguments */
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int fsize = p->maxstacksize; /* frame size */
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checkstackp(L, fsize, func);
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if (p->is_vararg != 1) { /* do not use vararg? */
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if (p->is_vararg)
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base = adjust_varargs(L, p, n);
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else { /* non vararg function */
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for (; n < p->numparams; n++)
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setnilvalue(L->top++); /* complete missing arguments */
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base = func + 1;
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}
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else
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base = adjust_varargs(L, p, n);
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ci = next_ci(L); /* now 'enter' new function */
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ci->nresults = nresults;
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ci->func = func;
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@ -566,19 +569,17 @@ static void finishCcall (lua_State *L, int status) {
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/* error status can only happen in a protected call */
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lua_assert((ci->callstatus & CIST_YPCALL) || status == LUA_YIELD);
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if (ci->callstatus & CIST_YPCALL) { /* was inside a pcall? */
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ci->callstatus &= ~CIST_YPCALL; /* finish 'lua_pcall' */
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L->errfunc = ci->u.c.old_errfunc;
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ci->callstatus &= ~CIST_YPCALL; /* continuation is also inside it */
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L->errfunc = ci->u.c.old_errfunc; /* with the same error function */
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}
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/* finish 'lua_callk'/'lua_pcall'; CIST_YPCALL and 'errfunc' already
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handled */
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adjustresults(L, ci->nresults);
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/* call continuation function */
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lua_unlock(L);
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n = (*ci->u.c.k)(L, status, ci->u.c.ctx);
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n = (*ci->u.c.k)(L, status, ci->u.c.ctx); /* call continuation function */
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lua_lock(L);
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api_checknelems(L, n);
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/* finish 'luaD_precall' */
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luaD_poscall(L, ci, L->top - n, n);
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luaD_poscall(L, ci, L->top - n, n); /* finish 'luaD_precall' */
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}
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@ -641,15 +642,16 @@ static int recover (lua_State *L, int status) {
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/*
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** signal an error in the call to 'resume', not in the execution of the
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** coroutine itself. (Such errors should not be handled by any coroutine
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** error handler and should not kill the coroutine.)
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** Signal an error in the call to 'lua_resume', not in the execution
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** of the coroutine itself. (Such errors should not be handled by any
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** coroutine error handler and should not kill the coroutine.)
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*/
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static l_noret resume_error (lua_State *L, const char *msg, StkId firstArg) {
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L->top = firstArg; /* remove args from the stack */
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static int resume_error (lua_State *L, const char *msg, int narg) {
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L->top -= narg; /* remove args from the stack */
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setsvalue2s(L, L->top, luaS_new(L, msg)); /* push error message */
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api_incr_top(L);
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luaD_throw(L, -1); /* jump back to 'lua_resume' */
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lua_unlock(L);
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return LUA_ERRRUN;
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}
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@ -661,22 +663,15 @@ static l_noret resume_error (lua_State *L, const char *msg, StkId firstArg) {
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** coroutine.
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*/
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static void resume (lua_State *L, void *ud) {
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int nCcalls = L->nCcalls;
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int n = *(cast(int*, ud)); /* number of arguments */
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StkId firstArg = L->top - n; /* first argument */
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CallInfo *ci = L->ci;
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if (nCcalls >= LUAI_MAXCCALLS)
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resume_error(L, "C stack overflow", firstArg);
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if (L->status == LUA_OK) { /* may be starting a coroutine */
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if (ci != &L->base_ci) /* not in base level? */
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resume_error(L, "cannot resume non-suspended coroutine", firstArg);
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/* coroutine is in base level; start running it */
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if (L->status == LUA_OK) { /* starting a coroutine? */
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if (!luaD_precall(L, firstArg - 1, LUA_MULTRET, 0)) /* Lua function? */
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luaV_execute(L); /* call it */
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}
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else if (L->status != LUA_YIELD)
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resume_error(L, "cannot resume dead coroutine", firstArg);
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else { /* resuming from previous yield */
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lua_assert(L->status == LUA_YIELD);
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L->status = LUA_OK; /* mark that it is running (again) */
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ci->func = restorestack(L, ci->extra);
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if (isLua(ci)) /* yielded inside a hook? */
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@ -693,7 +688,6 @@ static void resume (lua_State *L, void *ud) {
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}
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unroll(L, NULL); /* run continuation */
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}
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lua_assert(nCcalls == L->nCcalls);
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}
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@ -701,8 +695,16 @@ LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs) {
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int status;
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unsigned short oldnny = L->nny; /* save "number of non-yieldable" calls */
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lua_lock(L);
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luai_userstateresume(L, nargs);
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if (L->status == LUA_OK) { /* may be starting a coroutine */
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if (L->ci != &L->base_ci) /* not in base level? */
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return resume_error(L, "cannot resume non-suspended coroutine", nargs);
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}
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else if (L->status != LUA_YIELD)
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return resume_error(L, "cannot resume dead coroutine", nargs);
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L->nCcalls = (from) ? from->nCcalls + 1 : 1;
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if (L->nCcalls >= LUAI_MAXCCALLS)
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return resume_error(L, "C stack overflow", nargs);
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luai_userstateresume(L, nargs);
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L->nny = 0; /* allow yields */
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api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs);
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status = luaD_rawrunprotected(L, resume, &nargs);
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Dibyendu Majumdar
8 years ago