1 /* $NetBSD: ldo.h,v 1.12 2023/06/08 21:12:08 nikita Exp $ */ 2 3 /* 4 ** Id: ldo.h 5 ** Stack and Call structure of Lua 6 ** See Copyright Notice in lua.h 7 */ 8 9 #ifndef ldo_h 10 #define ldo_h 11 12 13 #include "llimits.h" 14 #include "lobject.h" 15 #include "lstate.h" 16 #include "lzio.h" 17 18 19 /* 20 ** Macro to check stack size and grow stack if needed. Parameters 21 ** 'pre'/'pos' allow the macro to preserve a pointer into the 22 ** stack across reallocations, doing the work only when needed. 23 ** It also allows the running of one GC step when the stack is 24 ** reallocated. 25 ** 'condmovestack' is used in heavy tests to force a stack reallocation 26 ** at every check. 27 */ 28 #define luaD_checkstackaux(L,n,pre,pos) \ 29 if (l_unlikely(L->stack_last.p - L->top.p <= (n))) \ 30 { pre; luaD_growstack(L, n, 1); pos; } \ 31 else { condmovestack(L,pre,pos); } 32 33 /* In general, 'pre'/'pos' are empty (nothing to save) */ 34 #define luaD_checkstack(L,n) luaD_checkstackaux(L,n,(void)0,(void)0) 35 36 37 38 #define savestack(L,pt) (cast_charp(pt) - cast_charp(L->stack.p)) 39 #define restorestack(L,n) cast(StkId, cast_charp(L->stack.p) + (n)) 40 41 42 /* macro to check stack size, preserving 'p' */ 43 #define checkstackp(L,n,p) \ 44 luaD_checkstackaux(L, n, \ 45 ptrdiff_t t__ = savestack(L, p), /* save 'p' */ \ 46 p = restorestack(L, t__)) /* 'pos' part: restore 'p' */ 47 48 49 /* macro to check stack size and GC, preserving 'p' */ 50 #define checkstackGCp(L,n,p) \ 51 luaD_checkstackaux(L, n, \ 52 ptrdiff_t t__ = savestack(L, p); /* save 'p' */ \ 53 luaC_checkGC(L), /* stack grow uses memory */ \ 54 p = restorestack(L, t__)) /* 'pos' part: restore 'p' */ 55 56 57 /* macro to check stack size and GC */ 58 #define checkstackGC(L,fsize) \ 59 luaD_checkstackaux(L, (fsize), luaC_checkGC(L), (void)0) 60 61 62 /* type of protected functions, to be ran by 'runprotected' */ 63 typedef void (*Pfunc) (lua_State *L, void *ud); 64 65 LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop); 66 LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name, 67 const char *mode); 68 LUAI_FUNC void luaD_hook (lua_State *L, int event, int line, 69 int fTransfer, int nTransfer); 70 LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci); 71 LUAI_FUNC int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, 72 int narg1, int delta); 73 LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults); 74 LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults); 75 LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults); 76 LUAI_FUNC StkId luaD_tryfuncTM (lua_State *L, StkId func); 77 LUAI_FUNC int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status); 78 LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u, 79 ptrdiff_t oldtop, ptrdiff_t ef); 80 LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres); 81 LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror); 82 LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror); 83 LUAI_FUNC void luaD_shrinkstack (lua_State *L); 84 LUAI_FUNC void luaD_inctop (lua_State *L); 85 86 LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode); 87 LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud); 88 89 #endif 90 91