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->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' */ 53 typedef void (*Pfunc) (lua_State *L, void *ud); 54 55 LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop); 56 LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name, 57 const char *mode); 58 LUAI_FUNC void luaD_hook (lua_State *L, int event, int line, 59 int fTransfer, int nTransfer); 60 LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci); 61 LUAI_FUNC void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int n); 62 LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults); 63 LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults); 64 LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults); 65 LUAI_FUNC void luaD_tryfuncTM (lua_State *L, StkId func); 66 LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u, 67 ptrdiff_t oldtop, ptrdiff_t ef); 68 LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres); 69 LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror); 70 LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror); 71 LUAI_FUNC void luaD_shrinkstack (lua_State *L); 72 LUAI_FUNC void luaD_inctop (lua_State *L); 73 74 LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode); 75 LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud); 76 77 #endif 78 79