[Python-Dev] Is core dump always a bug? Advice requested (original) (raw)

Michel Pelletier michel at dialnetwork.com
Thu May 13 13:04:36 EDT 2004

On Thursday 13 May 2004 04:43, python-dev-request at python.org wrote:

It's important to read what people who have actually done it have to say about subtleties. For example, your algorithm considered 'return' to be 'a terminal instruction'. But what if it appeared in the 'try' clause of a try/finally construct? In Python's PVM, most possible control flow is implicit (virtually any opcode can raise an exception, and from there "magically jump" to the code at an enclosing 'except' or 'finally' clause); and even an unexceptional bare 'return' can magically jump to an enclosing 'finally' block. The Java reference discusses these things, and anyone intending to do something here is still strongly urged to read it.

But just looking at some code here, is RETURN_VALUE ever inside a SETUP_EXCEPT block? The end of the SETUP_EXCEPT block apears to ABSOLUTE_JUMP past all the exception handlers to finally, and then to the RETURN_VALUE, which doesn't seem to fall under the protection of a try/except.

I'm not saying there are no subtleties as you describe, I'm just trying to quantify some of them and wondering if this is one.

-Michel

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