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https://github.com/lua/lua
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b07fc10e91
Initial implementation to allow yields inside '__close' metamethods. This current version still does not allow a '__close' metamethod to yield when called due to an error. '__close' metamethods from C functions also are not allowed to yield.
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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** $Id: lfunc.h $
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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(offsetof(CClosure, upvalue)) + \
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cast_int(sizeof(TValue)) * (n))
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#define sizeLclosure(n) (cast_int(offsetof(LClosure, upvals)) + \
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cast_int(sizeof(TValue *)) * (n))
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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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#define upisopen(up) ((up)->v != &(up)->u.value)
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#define uplevel(up) check_exp(upisopen(up), cast(StkId, (up)->v))
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/*
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** maximum number of misses before giving up the cache of closures
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** in prototypes
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*/
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#define MAXMISS 10
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/*
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** Special "status" for 'luaF_close'
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*/
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/* close upvalues without running their closing methods */
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#define NOCLOSINGMETH (-1)
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/* special status to close upvalues preserving the top of the stack */
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#define CLOSEKTOP (-2)
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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 nupvals);
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LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nupvals);
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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_newtbcupval (lua_State *L, StkId level);
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LUAI_FUNC void luaF_close (lua_State *L, StkId level, int status, int yy);
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LUAI_FUNC void luaF_unlinkupval (UpVal *uv);
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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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