/*

** $Id: ldo.h $

** Stack and Call structure of Lua

** See Copyright Notice in lua.h

*/

#ifndef ldo_h

#define ldo_h

#include "llimits.h"

#include "lobject.h"

#include "lstate.h"

#include "lzio.h"

/*

** Macro to check stack size and grow stack if needed. Parameters

** 'pre'/'pos' allow the macro to preserve a pointer into the

** stack across reallocations, doing the work only when needed.

** It also allows the running of one GC step when the stack is

** reallocated.

** 'condmovestack' is used in heavy tests to force a stack reallocation

** at every check.

*/

#if !defined(HARDSTACKTESTS)

#define condmovestack(L,pre,pos) ((void)0)

#else

/* realloc stack keeping its size */

#define condmovestack(L,pre,pos) \

{ int sz_ = stacksize(L); pre; luaD_reallocstack((L), sz_, 0); pos; }

#endif

#define luaD_checkstackaux(L,n,pre,pos) \

if (l_unlikely(L->stack_last.p - L->top.p <= (n))) \

{ pre; luaD_growstack(L, n, 1); pos; } \

else { condmovestack(L,pre,pos); }

/* In general, 'pre'/'pos' are empty (nothing to save) */

#define luaD_checkstack(L,n) luaD_checkstackaux(L,n,(void)0,(void)0)

#define savestack(L,pt) (cast_charp(pt) - cast_charp(L->stack.p))

#define restorestack(L,n) cast(StkId, cast_charp(L->stack.p) + (n))

/* macro to check stack size, preserving 'p' */

#define checkstackp(L,n,p) \

luaD_checkstackaux(L, n, \

ptrdiff_t t__ = savestack(L, p), /* save 'p' */ \

p = restorestack(L, t__)) /* 'pos' part: restore 'p' */

/*

** Maximum depth for nested C calls, syntactical nested non-terminals,

** and other features implemented through recursion in C. (Value must

** fit in a 16-bit unsigned integer. It must also be compatible with

** the size of the C stack.)

*/

#if !defined(LUAI_MAXCCALLS)

#define LUAI_MAXCCALLS 200

#endif

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

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

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

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

const char *mode);

LUAI_FUNC void luaD_hook (lua_State *L, int event, int line,

int fTransfer, int nTransfer);

LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci);

LUAI_FUNC int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func,

int narg1, int delta);

LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults);

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

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

LUAI_FUNC int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status);

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

ptrdiff_t oldtop, ptrdiff_t ef);

LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres);

LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror);

LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror);

LUAI_FUNC void luaD_shrinkstack (lua_State *L);

LUAI_FUNC void luaD_inctop (lua_State *L);

LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);

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

#endif