zombiezen.com/go/lua@v0.0.0-20231013005828-290725fb9140/internal/lua54/ldo.h (about)

     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 "llimits.h"
    12  #include "lobject.h"
    13  #include "lstate.h"
    14  #include "lzio.h"
    15  
    16  
    17  /*
    18  ** Macro to check stack size and grow stack if needed.  Parameters
    19  ** 'pre'/'pos' allow the macro to preserve a pointer into the
    20  ** stack across reallocations, doing the work only when needed.
    21  ** It also allows the running of one GC step when the stack is
    22  ** reallocated.
    23  ** 'condmovestack' is used in heavy tests to force a stack reallocation
    24  ** at every check.
    25  */
    26  #define luaD_checkstackaux(L,n,pre,pos)  \
    27  	if (l_unlikely(L->stack_last.p - L->top.p <= (n))) \
    28  	  { pre; luaD_growstack(L, n, 1); pos; } \
    29          else { condmovestack(L,pre,pos); }
    30  
    31  /* In general, 'pre'/'pos' are empty (nothing to save) */
    32  #define luaD_checkstack(L,n)	luaD_checkstackaux(L,n,(void)0,(void)0)
    33  
    34  
    35  
    36  #define savestack(L,pt)		(cast_charp(pt) - cast_charp(L->stack.p))
    37  #define restorestack(L,n)	cast(StkId, cast_charp(L->stack.p) + (n))
    38  
    39  
    40  /* macro to check stack size, preserving 'p' */
    41  #define checkstackp(L,n,p)  \
    42    luaD_checkstackaux(L, n, \
    43      ptrdiff_t t__ = savestack(L, p),  /* save 'p' */ \
    44      p = restorestack(L, t__))  /* 'pos' part: restore 'p' */
    45  
    46  
    47  /* macro to check stack size and GC, preserving 'p' */
    48  #define checkstackGCp(L,n,p)  \
    49    luaD_checkstackaux(L, n, \
    50      ptrdiff_t t__ = savestack(L, p);  /* save 'p' */ \
    51      luaC_checkGC(L),  /* stack grow uses memory */ \
    52      p = restorestack(L, t__))  /* 'pos' part: restore 'p' */
    53  
    54  
    55  /* macro to check stack size and GC */
    56  #define checkstackGC(L,fsize)  \
    57  	luaD_checkstackaux(L, (fsize), luaC_checkGC(L), (void)0)
    58  
    59  
    60  /* type of protected functions, to be ran by 'runprotected' */
    61  typedef void (*Pfunc) (lua_State *L, void *ud);
    62  
    63  LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
    64  LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
    65                                                    const char *mode);
    66  LUAI_FUNC void luaD_hook (lua_State *L, int event, int line,
    67                                          int fTransfer, int nTransfer);
    68  LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci);
    69  LUAI_FUNC int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func,
    70                                                int narg1, int delta);
    71  LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults);
    72  LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
    73  LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);
    74  LUAI_FUNC StkId luaD_tryfuncTM (lua_State *L, StkId func);
    75  LUAI_FUNC int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status);
    76  LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
    77                                          ptrdiff_t oldtop, ptrdiff_t ef);
    78  LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres);
    79  LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror);
    80  LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror);
    81  LUAI_FUNC void luaD_shrinkstack (lua_State *L);
    82  LUAI_FUNC void luaD_inctop (lua_State *L);
    83  
    84  LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);
    85  LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
    86  
    87  #endif
    88