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* NEWS: Bison-generated parsers no longer default to using the

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alloca function (when available) to extend the parser stack, due
to widespread problems in unchecked stack-overflow detection.
* data/glr.c (YYMAXDEPTH): Remove undef when zero.  It's the user's
responsibility to set it to a positive value.  This lets the user
specify a value that is not a preprocessor constant.
* data/yacc.c (YYMAXDEPTH): Likewise.
(YYSTACK_ALLOC): Define only if YYSTACK_USE_ALLOCA is nonzero.
* doc/bison.texinfo (Stack Overflow): YYMAXDEPTH no longer needs
to be a compile-time constant.  However, explain the constraints on it.
Also, explain the constraints on YYINITDEPTH.
(Table of Symbols): Explain that alloca is no longer the default.
Explain the user's responsibility if they define YYSTACK_USE_ALLOCA
to 1.
This commit is contained in:
Paul Eggert
2004-12-22 21:19:47 +00:00
parent 0a2c51373a
commit d7e14fc000
5 changed files with 54 additions and 21 deletions
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data/glr.c
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@@ -536,10 +536,6 @@ int yydebug;
SIZE_MAX < YYMAXDEPTH * sizeof (GLRStackItem)
evaluated with infinite-precision integer arithmetic. */
#if YYMAXDEPTH == 0
# undef YYMAXDEPTH
#endif
#ifndef YYMAXDEPTH
# define YYMAXDEPTH ]b4_stack_depth_max[
#endif