Stack Overflow, and How to Avoid It =================================== The Bison parser stack can overflow if too many tokens are shifted and not reduced. When this happens, the parser function `yyparse' returns a nonzero value, pausing only to call `yyerror' to report the overflow. By defining the macro `YYMAXDEPTH', you can control how deep the parser stack can become before a stack overflow occurs. Define the macro with a value that is an integer. This value is the maximum number of tokens that can be shifted (and not reduced) before overflow. It must be a constant expression whose value is known at compile time. The stack space allowed is not necessarily allocated. If you specify a large value for `YYMAXDEPTH', the parser actually allocates a small stack at first, and then makes it bigger by stages as needed. This increasing allocation happens automatically and silently. Therefore, you do not need to make `YYMAXDEPTH' painfully small merely to save space for ordinary inputs that do not need much stack. The default value of `YYMAXDEPTH', if you do not define it, is 10000. You can control how much stack is allocated initially by defining the macro `YYINITDEPTH'. This value too must be a compile-time constant integer. The default is 200.
Dirfile and infopages generated Sat Dec 3 02:07:54 2005