[Libre-soc-bugs] [Bug 438] add caching/memoization to soc.simulator.program.Program

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=438

--- Comment #5 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #0)

> Importantly: it needs to *NOT* keep a file open for every Program instance.

this is sorted by using the "with" pattern.  the "with" pattern calls
__enter__ and __exit__.  in Program.__exit__ self.close() is called.

because this had been used:

     x = Program()
     x.add_test()

the close function was not being called.  it should have been:

     x = Program()
     x.add_test()
     x.close()

however the whole purpose of "with" is to avoid that extra line and
avoid polluting code with entry/exit gunk.

hence the change to:

      with Program() as x:
         x.add_test()

and the problem is now gone.

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