1*088332b5SXin Li /* 2*088332b5SXin Li ** $Id: ldo.h $ 3*088332b5SXin Li ** Stack and Call structure of Lua 4*088332b5SXin Li ** See Copyright Notice in lua.h 5*088332b5SXin Li */ 6*088332b5SXin Li 7*088332b5SXin Li #ifndef ldo_h 8*088332b5SXin Li #define ldo_h 9*088332b5SXin Li 10*088332b5SXin Li 11*088332b5SXin Li #include "lobject.h" 12*088332b5SXin Li #include "lstate.h" 13*088332b5SXin Li #include "lzio.h" 14*088332b5SXin Li 15*088332b5SXin Li 16*088332b5SXin Li /* 17*088332b5SXin Li ** Macro to check stack size and grow stack if needed. Parameters 18*088332b5SXin Li ** 'pre'/'pos' allow the macro to preserve a pointer into the 19*088332b5SXin Li ** stack across reallocations, doing the work only when needed. 20*088332b5SXin Li ** It also allows the running of one GC step when the stack is 21*088332b5SXin Li ** reallocated. 22*088332b5SXin Li ** 'condmovestack' is used in heavy tests to force a stack reallocation 23*088332b5SXin Li ** at every check. 24*088332b5SXin Li */ 25*088332b5SXin Li #define luaD_checkstackaux(L,n,pre,pos) \ 26*088332b5SXin Li if (L->stack_last - L->top <= (n)) \ 27*088332b5SXin Li { pre; luaD_growstack(L, n, 1); pos; } \ 28*088332b5SXin Li else { condmovestack(L,pre,pos); } 29*088332b5SXin Li 30*088332b5SXin Li /* In general, 'pre'/'pos' are empty (nothing to save) */ 31*088332b5SXin Li #define luaD_checkstack(L,n) luaD_checkstackaux(L,n,(void)0,(void)0) 32*088332b5SXin Li 33*088332b5SXin Li 34*088332b5SXin Li 35*088332b5SXin Li #define savestack(L,p) ((char *)(p) - (char *)L->stack) 36*088332b5SXin Li #define restorestack(L,n) ((StkId)((char *)L->stack + (n))) 37*088332b5SXin Li 38*088332b5SXin Li 39*088332b5SXin Li /* macro to check stack size, preserving 'p' */ 40*088332b5SXin Li #define checkstackGCp(L,n,p) \ 41*088332b5SXin Li luaD_checkstackaux(L, n, \ 42*088332b5SXin Li ptrdiff_t t__ = savestack(L, p); /* save 'p' */ \ 43*088332b5SXin Li luaC_checkGC(L), /* stack grow uses memory */ \ 44*088332b5SXin Li p = restorestack(L, t__)) /* 'pos' part: restore 'p' */ 45*088332b5SXin Li 46*088332b5SXin Li 47*088332b5SXin Li /* macro to check stack size and GC */ 48*088332b5SXin Li #define checkstackGC(L,fsize) \ 49*088332b5SXin Li luaD_checkstackaux(L, (fsize), luaC_checkGC(L), (void)0) 50*088332b5SXin Li 51*088332b5SXin Li 52*088332b5SXin Li /* type of protected functions, to be ran by 'runprotected' */ 53*088332b5SXin Li typedef void (*Pfunc) (lua_State *L, void *ud); 54*088332b5SXin Li 55*088332b5SXin Li LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop); 56*088332b5SXin Li LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name, 57*088332b5SXin Li const char *mode); 58*088332b5SXin Li LUAI_FUNC void luaD_hook (lua_State *L, int event, int line, 59*088332b5SXin Li int fTransfer, int nTransfer); 60*088332b5SXin Li LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci); 61*088332b5SXin Li LUAI_FUNC void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int n); 62*088332b5SXin Li LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults); 63*088332b5SXin Li LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults); 64*088332b5SXin Li LUAI_FUNC void luaD_tryfuncTM (lua_State *L, StkId func); 65*088332b5SXin Li LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u, 66*088332b5SXin Li ptrdiff_t oldtop, ptrdiff_t ef); 67*088332b5SXin Li LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres); 68*088332b5SXin Li LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror); 69*088332b5SXin Li LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror); 70*088332b5SXin Li LUAI_FUNC void luaD_shrinkstack (lua_State *L); 71*088332b5SXin Li LUAI_FUNC void luaD_inctop (lua_State *L); 72*088332b5SXin Li 73*088332b5SXin Li LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode); 74*088332b5SXin Li LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud); 75*088332b5SXin Li 76*088332b5SXin Li #endif 77*088332b5SXin Li 78