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' */
37typedef void (*Pfunc) (lua_State *L, void *ud);
38
39LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
40 const char *mode);
41LUAI_FUNC void luaD_hook (lua_State *L, int event, int line);
42LUAI_FUNC int luaD_precall (lua_State *L, StkId func, int nresults);
43LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
44LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);
45LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
46 ptrdiff_t oldtop, ptrdiff_t ef);
47LUAI_FUNC int luaD_poscall (lua_State *L, CallInfo *ci, StkId firstResult,
48 int nres);
49LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);
50LUAI_FUNC void luaD_growstack (lua_State *L, int n);
51LUAI_FUNC void luaD_shrinkstack (lua_State *L);
52LUAI_FUNC void luaD_inctop (lua_State *L);
53
54LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);
55LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
56
57#endif
58
59