mirror of
https://github.com/lua/lua
synced 2024-11-22 04:41:23 +03:00
152b51955a
Function calls do not create new objects. (It may use memory with stack reallocation, but now that is irrelevant to the GC.)
77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
/*
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** $Id: ldo.h $
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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 "llimits.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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** It also allows the running of one GC step when the stack is
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** reallocated.
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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_unlikely(L->stack_last.p - L->top.p <= (n))) \
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{ pre; luaD_growstack(L, n, 1); pos; } \
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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,pt) (cast_charp(pt) - cast_charp(L->stack.p))
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#define restorestack(L,n) cast(StkId, cast_charp(L->stack.p) + (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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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 void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
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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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int fTransfer, int nTransfer);
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LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci);
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LUAI_FUNC int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func,
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int narg1, int delta);
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LUAI_FUNC CallInfo *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 StkId luaD_tryfuncTM (lua_State *L, StkId func);
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LUAI_FUNC int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status);
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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 void luaD_poscall (lua_State *L, CallInfo *ci, int nres);
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LUAI_FUNC int luaD_reallocstack (lua_State *L, int newsize, int raiseerror);
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LUAI_FUNC int luaD_growstack (lua_State *L, int n, int raiseerror);
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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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