mirror of
https://github.com/lua/lua
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67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/*
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** $Id: ldo.h,v 2.29 2015/12/21 13:02:14 roberto Exp roberto $
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** Stack and Call structure of Lua
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** See Copyright Notice in lua.h
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*/
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#ifndef ldo_h
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#define ldo_h
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#include "lobject.h"
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#include "lstate.h"
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#include "lzio.h"
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/*
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** Macro to check stack size and grow stack if needed. Parameters
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** 'pre'/'pos' allow the macro to preserve a pointer into the
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** stack across reallocations, doing the work only when needed.
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** 'condmovestack' is used in heavy tests to force a stack reallocation
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** at every check.
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*/
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#define luaD_checkstackaux(L,n,pre,pos) \
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if (L->stack_last - L->top <= (n)) \
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{ pre; luaD_growstack(L, n); pos; } else { condmovestack(L,pre,pos); }
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/* In general, 'pre'/'pos' are empty (nothing to save) */
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#define luaD_checkstack(L,n) luaD_checkstackaux(L,n,(void)0,(void)0)
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#define savestack(L,p) ((char *)(p) - (char *)L->stack)
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#define restorestack(L,n) ((TValue *)((char *)L->stack + (n)))
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/* macro to check stack size, preserving 'p' */
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#define checkstackp(L,n,p) \
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luaD_checkstackaux(L, n, \
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ptrdiff_t t__ = savestack(L, p); /* save 'p' */ \
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luaC_checkGC(L), /* stack grow uses memory */ \
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p = restorestack(L, t__)) /* 'pos' part: restore 'p' */
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/* type of protected functions, to be ran by 'runprotected' */
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typedef void (*Pfunc) (lua_State *L, void *ud);
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LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
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const char *mode);
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LUAI_FUNC void luaD_hook (lua_State *L, int event, int line);
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LUAI_FUNC int luaD_precall (lua_State *L, StkId func, int nresults);
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LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
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LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);
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LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
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ptrdiff_t oldtop, ptrdiff_t ef);
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LUAI_FUNC int luaD_poscall (lua_State *L, CallInfo *ci, StkId firstResult,
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int nres);
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LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);
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LUAI_FUNC void luaD_growstack (lua_State *L, int n);
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LUAI_FUNC void luaD_shrinkstack (lua_State *L);
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LUAI_FUNC void luaD_inctop (lua_State *L);
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LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);
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LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
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#endif
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