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small changes to allow 'precall' to spend time preserving 'func'

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only when needed (that is, when stack actually changes)
This commit is contained in:
Roberto Ierusalimschy
2015-10-21 16:40:47 -02:00
parent 48098c42ff
commit 5bdee4f810
3 changed files with 42 additions and 28 deletions
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17
ldo.h
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@@ -1,5 +1,5 @@
/*
** $Id: ldo.h,v 2.21 2014/10/25 11:50:46 roberto Exp roberto $
** $Id: ldo.h,v 2.22 2015/05/22 17:48:19 roberto Exp roberto $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/
@@ -13,8 +13,19 @@
#include "lzio.h"
#define luaD_checkstack(L,n) if (L->stack_last - L->top <= (n)) \
luaD_growstack(L, n); else condmovestack(L);
/*
** Macro to check stack size and grow stack if needed. Parameters
** 'pre'/'pos' allow the macro to preserve a pointer into the
** stack across realalocations, doing the work only when needed.
** 'condmovestack' is used in heavy tests to force a stack reallocation
** at every check.
*/
#define luaD_checkstackaux(L,n,pre,pos) \
if (L->stack_last - L->top <= (n)) \
{ pre; luaD_growstack(L, n); pos; } else { condmovestack(L,pre,pos); }
/* In general, 'pre'/'pos' are empty (nothing to save) */
#define luaD_checkstack(L,n) luaD_checkstackaux(L,n,,)
#define incr_top(L) {L->top++; luaD_checkstack(L,0);}