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maximum C stack should reserve some values for pseudo-indices

This commit is contained in:
Roberto Ierusalimschy 2008-02-11 17:17:19 -02:00
parent dd92af69db
commit aec671c126
1 changed files with 14 additions and 6 deletions
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20
luaconf.h
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@ -1,5 +1,5 @@
/*
** $Id: luaconf.h,v 1.94 2008/01/02 16:36:19 roberto Exp roberto $
** $Id: luaconf.h,v 1.95 2008/01/17 16:24:38 roberto Exp roberto $
** Configuration file for Lua
** See Copyright Notice in lua.h
*/
@ -411,12 +411,20 @@
/*
@@ LUAI_MAXCSTACK limits the number of Lua stack slots that a C function
@* can use.
** CHANGE it if you need lots of (Lua) stack space for your C
** functions. This limit is arbitrary; its only purpose is to stop C
** functions to consume unlimited stack space.
** CHANGE it if you need a different limit. This limit is arbitrary;
** its only purpose is to stop C functions to consume unlimited stack
** space.
*/
#define LUAI_MCS_AUX ((int)(INT_MAX / (4*sizeof(LUA_NUMBER))))
#define LUAI_MAXCSTACK (LUAI_MCS_AUX > SHRT_MAX ? SHRT_MAX : LUAI_MCS_AUX)
/* life is simpler if stack size fits in an int (16 is an estimate
for the size of a Lua value) */
#if SHRT_MAX < (INT_MAX / 16)
#define LUAI_MCS_AUX SHRT_MAX
#else
#define LUAI_MCS_AUX (INT_MAX / 16)
#endif
/* reserve some space for pseudo-indices */
#define LUAI_MAXCSTACK (LUAI_MCS_AUX - 1000)