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From: worley@compass.com (Dale Worley)
Newsgroups: comp.lang.perl
Subject: "Out of Memory" in debugger
Message-ID: <1991Jan3.074230.2072@uvaarpa.Virginia.EDU>
Date: 3 Jan 91 07:42:30 GMT
Sender: mmdf@uvaarpa.Virginia.EDU (Uvaarpa Mail System)
Reply-To: worley@compass.com
Organization: The Internet
Lines: 25

I am not certain, but I suspect that this problem (the debugger
reports "Out of Memory" while trying to allocate gigabytes of memory)
is due to dodb() constructing only one argument for the O_SUBR that
calls DB, whereas do_subr() requires two (one for the subroutine name,
one for the argument list).

Evidence: -D1024 shows that "&db" written by the user is compiled with
two arguments, whereas the implicit "&db" inserted by "-d" has only
one.  The code in do_subr() seems to expect two arguments, for
example:

    register int items = arglast[2] - sp;	/* sp = arglast[1] here */

    int hasargs = ((arg[2].arg_type & A_MASK) != A_NULL);

There seems to be no conditionalization in do_subr() that would allow
it to avoid executing these statements when the implicit "&db" is
called.

Dale

Dale Worley		Compass, Inc.			worley@compass.com
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