Author xdegaye
Recipients benjamin.peterson, georg.brandl, jcea, xdegaye
Date 2014-07-08.10:57:57
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Marked as misclassified Yes
Message-id <1404817080.03.0.146993659633.issue17288@psf.upfronthosting.co.za>
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Python 3.5 is still crashing with this test:

$ python jump.py
> jump.py(7)<module>()
-> for i in gen():
(Pdb) break 3
Breakpoint 1 at jump.py:3
(Pdb) continue
> jump.py(3)gen()
-> yield i
(Pdb) step
--Return--
> jump.py(3)gen()->0
-> yield i
(Pdb) jump 2
> jump.py(2)gen()->0
-> for i in range(1):
(Pdb) continue
Segmentation fault (core dumped)


It is true that frame_setlineno() assumes incorrectly that f->f_stacktop is not NULL, but the reason of the crash or of the "SystemError: unknown opcode" is that PyEval_EvalFrameEx() expects on its invocation f->f_lasti to refer to the index of the last instruction executed and sets (and assumes this instruction does not have argument) 'next_instr' accordingly to the next byte, while by jumping to line 2 we set f->f_lasti to zero and 'SETUP_LOOP', the opcode at this index, has an argument.

The attached patch is a slight improvement over the last one.
History
Date User Action Args
2014-07-08 10:58:00xdegayesetrecipients: + xdegaye, georg.brandl, jcea, benjamin.peterson
2014-07-08 10:58:00xdegayesetmessageid: <1404817080.03.0.146993659633.issue17288@psf.upfronthosting.co.za>
2014-07-08 10:57:59xdegayelinkissue17288 messages
2014-07-08 10:57:59xdegayecreate