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1 /*
2 ** $Id: ldo.h,v 2.29.1.1 2017/04/19 17:20:42 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 /*
17 ** Macro to check stack size and grow stack if needed.  Parameters
18 ** 'pre'/'pos' allow the macro to preserve a pointer into the
19 ** stack across reallocations, doing the work only when needed.
20 ** 'condmovestack' is used in heavy tests to force a stack reallocation
21 ** at every check.
22 */
23 #define luaD_checkstackaux(L,n,pre,pos)  \
24 	if (L->stack_last - L->top <= (n)) \
25 	  { pre; luaD_growstack(L, n); pos; } else { condmovestack(L,pre,pos); }
26 
27 /* In general, 'pre'/'pos' are empty (nothing to save) */
28 #define luaD_checkstack(L,n)	luaD_checkstackaux(L,n,(void)0,(void)0)
29 
30 
31 
32 #define savestack(L,p)		((char *)(p) - (char *)L->stack)
33 #define restorestack(L,n)	((TValue *)((char *)L->stack + (n)))
34 
35 
36 /* type of protected functions, to be ran by 'runprotected' */
37 typedef void (*Pfunc) (lua_State *L, void *ud);
38 
39 LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
40                                                   const char *mode);
41 LUAI_FUNC void luaD_hook (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 void luaD_callnoyield (lua_State *L, StkId func, int nResults);
45 LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
46                                         ptrdiff_t oldtop, ptrdiff_t ef);
47 LUAI_FUNC int luaD_poscall (lua_State *L, CallInfo *ci, StkId firstResult,
48                                           int nres);
49 LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);
50 LUAI_FUNC void luaD_growstack (lua_State *L, int n);
51 LUAI_FUNC void luaD_shrinkstack (lua_State *L);
52 LUAI_FUNC void luaD_inctop (lua_State *L);
53 
54 LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);
55 LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
56 
57 #endif
58 
59