R-alpha: browser()
Thomas Lumley
thomas@biostat.washington.edu
Wed, 6 Aug 1997 09:41:37 -0700 (PDT)
Kurt pointed out that
R> browser()
is now the shortest segfault. The problem is in do_browser in main.c at
about line 420:
if( !DEBUG(rho) ) {
cptr=R_GlobalContext;
while (cptr->callflag != CTXT_RETURN)
cptr = cptr->nextcontext;
Rprintf("Called from: ");
PrintValueRec(cptr->call);
}
When browser() is called from the top level rather than from a function we
have cptr->callflag==CTXT_TOPLEVEL, so the test succeeds, but as there are
no other contexts we have cptr->nextcontext==NULL and a segfault.
Thomas Lumley
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