1 /*

     2 ** $Id: ldo.h,v 2.7.1.1 2007/12/27 13:02:25 roberto Exp $

     3 ** Stack and Call structure of Lua

     4 ** See Copyright Notice in lua.h

     5 */

     6 

     7 #ifndef ldo_h

     8 #define ldo_h

     9 

    10 

    11 #include "lobject.h"

    12 #include "lstate.h"

    13 #include "lzio.h"

    14 

    15 

    16 #define luaD_checkstack(L,n)	\

    17   if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TValue)) \

    18     luaD_growstack(L, n); \

    19   else condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1));

    20 

    21 

    22 #define incr_top(L) {luaD_checkstack(L,1); L->top++;}

    23 

    24 #define savestack(L,p)		((char *)(p) - (char *)L->stack)

    25 #define restorestack(L,n)	((TValue *)((char *)L->stack + (n)))

    26 

    27 #define saveci(L,p)		((char *)(p) - (char *)L->base_ci)

    28 #define restoreci(L,n)		((CallInfo *)((char *)L->base_ci + (n)))

    29 

    30 

    31 /* results from luaD_precall */

    32 #define PCRLUA		0	/* initiated a call to a Lua function */

    33 #define PCRC		1	/* did a call to a C function */

    34 #define PCRYIELD	2	/* C funtion yielded */

    35 

    36 

    37 /* type of protected functions, to be ran by `runprotected' */

    38 typedef void (*Pfunc) (lua_State *L, void *ud);

    39 

    40 LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name);

    41 LUAI_FUNC void luaD_callhook (lua_State *L, int event, int line);

    42 LUAI_FUNC int luaD_precall (lua_State *L, StkId func, int nresults);

    43 LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);

    44 LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,

    45                                         ptrdiff_t oldtop, ptrdiff_t ef);

    46 LUAI_FUNC int luaD_poscall (lua_State *L, StkId firstResult);

    47 LUAI_FUNC void luaD_reallocCI (lua_State *L, int newsize);

    48 LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);

    49 LUAI_FUNC void luaD_growstack (lua_State *L, int n);

    50 

    51 LUAI_FUNC void luaD_throw (lua_State *L, int errcode);

    52 LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);

    53 

    54 LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);

    55 

    56 #endif

    57