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 89