mirror of
https://github.com/lua/lua
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62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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** $Id: lfunc.h,v 2.14 2014/06/19 18:27:20 roberto Exp roberto $
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** Auxiliary functions to manipulate prototypes and closures
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** See Copyright Notice in lua.h
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*/
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#ifndef lfunc_h
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#define lfunc_h
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#include "lobject.h"
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#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
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cast(int, sizeof(TValue)*((n)-1)))
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#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
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cast(int, sizeof(TValue *)*((n)-1)))
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/* test whether thread is in 'twups' list */
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#define isintwups(L) (L->twups != L)
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/*
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** maximum number of upvalues in a closure (both C and Lua). (Value
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** must fit in a VM register.)
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*/
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#define MAXUPVAL 255
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/*
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** Upvalues for Lua closures
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*/
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struct UpVal {
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TValue *v; /* points to stack or to its own value */
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lu_mem refcount; /* reference counter */
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union {
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struct { /* (when open) */
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UpVal *next; /* linked list */
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int touched; /* mark to avoid cycles with dead threads */
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} open;
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TValue value; /* the value (when closed) */
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} u;
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};
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#define upisopen(up) ((up)->v != &(up)->u.value)
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LUAI_FUNC Proto *luaF_newproto (lua_State *L);
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LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nelems);
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LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nelems);
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LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);
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LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
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LUAI_FUNC void luaF_close (lua_State *L, StkId level);
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LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
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LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
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int pc);
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#endif
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