1/*
2** $Id: ldo.h $
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** It also allows the running of one GC step when the stack is
21** reallocated.
22** 'condmovestack' is used in heavy tests to force a stack reallocation
23** at every check.
24*/
25#define luaD_checkstackaux(L,n,pre,pos) \
26 if (l_unlikely(L->stack_last - L->top <= (n))) \
27 { pre; luaD_growstack(L, n, 1); pos; } \
28 else { condmovestack(L,pre,pos); }
29
30/* In general, 'pre'/'pos' are empty (nothing to save) */
31#define luaD_checkstack(L,n) luaD_checkstackaux(L,n,(void)0,(void)0)
32
33
34
35#define savestack(L,p) ((char *)(p) - (char *)L->stack)
36#define restorestack(L,n) ((StkId)((char *)L->stack + (n)))
37
38
39/* macro to check stack size, preserving 'p' */
40#define checkstackGCp(L,n,p) \
41 luaD_checkstackaux(L, n, \
42 ptrdiff_t t__ = savestack(L, p); /* save 'p' */ \
43 luaC_checkGC(L), /* stack grow uses memory */ \
44 p = restorestack(L, t__)) /* 'pos' part: restore 'p' */
45
46
47/* macro to check stack size and GC */
48#define checkstackGC(L,fsize) \
49 luaD_checkstackaux(L, (fsize), luaC_checkGC(L), (void)0)
50
51
52/* type of protected functions, to be ran by 'runprotected' */
53typedef void (*Pfunc) (lua_State *L, void *ud);
54
55LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
56LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
57 const char *mode);
58LUAI_FUNC void luaD_hook (lua_State *L, int event, int line,
59 int fTransfer, int nTransfer);
60LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci);
61LUAI_FUNC int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int narg1, int delta);
62LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults);
63LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
64LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);
65LUAI_FUNC StkId luaD_tryfuncTM (lua_State *L, StkId func);
66LUAI_FUNC int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status);
67LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
68 ptrdiff_t oldtop, ptrdiff_t ef);
69LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres);
70LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror);
71LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror);
72LUAI_FUNC void luaD_shrinkstack (lua_State *L);
73LUAI_FUNC void luaD_inctop (lua_State *L);
74
75LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);
76LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
77
78#endif
79
80