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(YYSTACK_ALLOC_MAXIMUM): Add more-descriptive comment.

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Paul Eggert
2005-04-25 03:14:22 +00:00
parent 9f666b5106
commit b9c9f76197
1 changed files with 4 additions and 0 deletions
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4
data/yacc.c
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@@ -239,6 +239,10 @@ b4_syncline([@oline@], [@ofile@])[
/* Pacify GCC's `empty if-body' warning. */
# define YYSTACK_FREE(Ptr) do { /* empty */; } while (0)
# ifndef YYSTACK_ALLOC_MAXIMUM
/* The OS might guarantee only one guard page at the bottom of the stack,
and a page size can be as small as 4096 bytes. So we cannot safely
invoke alloca (N) if N exceeds 4096. Use a slightly smaller number
to allow for a few compiler-allocated temporary stack slots. */
# define YYSTACK_ALLOC_MAXIMUM 4032 /* reasonable circa 2005 */
# endif
# else