diff options
Diffstat (limited to 'lua/ldo.c')
| -rw-r--r-- | lua/ldo.c | 31 |
1 files changed, 22 insertions, 9 deletions
@@ -1,5 +1,5 @@ /* -** $Id: ldo.c,v 2.105 2012/06/08 15:14:04 roberto Exp $ +** $Id: ldo.c,v 2.108.1.3 2013/11/08 18:22:50 roberto Exp $ ** Stack and Call structure of Lua ** See Copyright Notice in lua.h */ @@ -260,6 +260,7 @@ static StkId adjust_varargs (lua_State *L, Proto *p, int actual) { StkId base, fixed; lua_assert(actual >= nfixargs); /* move fixed parameters to final position */ + luaD_checkstack(L, p->maxstacksize); /* check again for new 'base' */ fixed = L->top - actual; /* first fixed argument */ base = L->top; /* final position of first argument */ for (i=0; i<nfixargs; i++) { @@ -311,6 +312,7 @@ int luaD_precall (lua_State *L, StkId func, int nresults) { ci->top = L->top + LUA_MINSTACK; lua_assert(ci->top <= L->stack_last); ci->callstatus = 0; + luaC_checkGC(L); /* stack grow uses memory */ if (L->hookmask & LUA_MASKCALL) luaD_hook(L, LUA_HOOKCALL, -1); lua_unlock(L); @@ -323,12 +325,18 @@ int luaD_precall (lua_State *L, StkId func, int nresults) { case LUA_TLCL: { /* Lua function: prepare its call */ StkId base; Proto *p = clLvalue(func)->p; - luaD_checkstack(L, p->maxstacksize); - func = restorestack(L, funcr); n = cast_int(L->top - func) - 1; /* number of real arguments */ + luaD_checkstack(L, p->maxstacksize); for (; n < p->numparams; n++) setnilvalue(L->top++); /* complete missing arguments */ - base = (!p->is_vararg) ? func + 1 : adjust_varargs(L, p, n); + if (!p->is_vararg) { + func = restorestack(L, funcr); + base = func + 1; + } + else { + base = adjust_varargs(L, p, n); + func = restorestack(L, funcr); /* previous call can change stack */ + } ci = next_ci(L); /* now 'enter' new function */ ci->nresults = nresults; ci->func = func; @@ -338,6 +346,7 @@ int luaD_precall (lua_State *L, StkId func, int nresults) { ci->u.l.savedpc = p->code; /* starting point */ ci->callstatus = CIST_LUA; L->top = ci->top; + luaC_checkGC(L); /* stack grow uses memory */ if (L->hookmask & LUA_MASKCALL) callhook(L, ci); return 0; @@ -393,7 +402,6 @@ void luaD_call (lua_State *L, StkId func, int nResults, int allowyield) { luaV_execute(L); /* call it */ if (!allowyield) L->nny--; L->nCcalls--; - luaC_checkGC(L); } @@ -402,7 +410,11 @@ static void finishCcall (lua_State *L) { int n; lua_assert(ci->u.c.k != NULL); /* must have a continuation */ lua_assert(L->nny == 0); - /* finish 'lua_callk' */ + if (ci->callstatus & CIST_YPCALL) { /* was inside a pcall? */ + ci->callstatus &= ~CIST_YPCALL; /* finish 'lua_pcall' */ + L->errfunc = ci->u.c.old_errfunc; + } + /* finish 'lua_callk'/'lua_pcall' */ adjustresults(L, ci->nresults); /* call continuation function */ if (!(ci->callstatus & CIST_STAT)) /* no call status? */ @@ -473,7 +485,7 @@ static int recover (lua_State *L, int status) { static l_noret resume_error (lua_State *L, const char *msg, StkId firstArg) { L->top = firstArg; /* remove args from the stack */ setsvalue2s(L, L->top, luaS_new(L, msg)); /* push error message */ - incr_top(L); + api_incr_top(L); luaD_throw(L, -1); /* jump back to 'lua_resume' */ } @@ -522,6 +534,7 @@ static void resume (lua_State *L, void *ud) { LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs) { int status; + int oldnny = L->nny; /* save 'nny' */ lua_lock(L); luai_userstateresume(L, nargs); L->nCcalls = (from) ? from->nCcalls + 1 : 1; @@ -543,7 +556,7 @@ LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs) { } lua_assert(status == L->status); } - L->nny = 1; /* do not allow yields */ + L->nny = oldnny; /* restore 'nny' */ L->nCcalls--; lua_assert(L->nCcalls == ((from) ? from->nCcalls : 0)); lua_unlock(L); @@ -558,7 +571,7 @@ LUA_API int lua_yieldk (lua_State *L, int nresults, int ctx, lua_CFunction k) { api_checknelems(L, nresults); if (L->nny > 0) { if (L != G(L)->mainthread) - luaG_runerror(L, "attempt to yield across metamethod/C-call boundary"); + luaG_runerror(L, "attempt to yield across a C-call boundary"); else luaG_runerror(L, "attempt to yield from outside a coroutine"); } |