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ldo.h
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/*
** $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
l_noret
luaD_errerr
(
lua_State
*
L
);
LUAI_FUNC
void
luaD_seterrorobj
(
lua_State
*
L
,
TStatus
errcode
,
StkId
oldtop
);
LUAI_FUNC
TStatus
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
TStatus
luaD_closeprotected
(
lua_State
*
L
,
ptrdiff_t
level
,
TStatus
status
);
LUAI_FUNC
TStatus
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
,
TStatus
errcode
);
LUAI_FUNC
l_noret
luaD_throwbaselevel
(
lua_State
*
L
,
TStatus
errcode
);
LUAI_FUNC
TStatus
luaD_rawrunprotected
(
lua_State
*
L
,
Pfunc
f
,
void
*
ud
);
#endif
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