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Re: [patch/rfc] Add a sentinel frame


Michael,

A shallow analysis of the problem is that, when the PC is in the frame dummy, read_fp() (i.e., cfi_read_fp()) returns NULL (an invalid frame). The new code is checking for this and bailing out. Disabling the test doesn't exactly improve things:

(gdb) finish
Inside legacy frame
Run till exit from #0 marker2 (a=99) at /home/cagney/PENDING/2003-02-24-prev-checks/src/gdb/testsuite/gdb.base/break.c:49
cfi_read_fp -> 0x0000000000000000
Can't pop dummy frame!
(gdb)


since the search for a NULL frame in the dummy_frame_stack will fail (see dummy_frame_pop).

Andrew


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