Author rhettinger
Recipients rhettinger
Date 2011-04-10.20:25:51
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Message-id <1302467152.39.0.854888976189.issue11822@psf.upfronthosting.co.za>
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Now that list comprehensions mask run their internals in code objects (the same way that genexps do), it is getting harder to use dis() to see what code is generated.  For example, the pow() call isn't shown in the following disassembly:

>>> dis('[x**2 for x in range(3)]')
  1           0 LOAD_CONST               0 (<code object <listcomp> at 0x1005d1e88, file "<dis>", line 1>) 
              3 MAKE_FUNCTION            0 
              6 LOAD_NAME                0 (range) 
              9 LOAD_CONST               1 (3) 
             12 CALL_FUNCTION            1 
             15 GET_ITER             
             16 CALL_FUNCTION            1 
             19 RETURN_VALUE    

I propose that dis() build-up a queue undisplayed code objects and then disassemble each of those after the main disassembly is done (effectively making it recursive and displaying code objects in the order that they are first seen in the disassembly).  For example, the output shown above would be followed by a disassembly of its internal code object:

<code object <listcomp> at 0x1005d1e88, file "<dis>", line 1>:
  1           0 BUILD_LIST               0 
              3 LOAD_FAST                0 (.0) 
        >>    6 FOR_ITER                16 (to 25) 
              9 STORE_FAST               1 (x) 
             12 LOAD_FAST                1 (x) 
             15 LOAD_CONST               0 (2) 
             18 BINARY_POWER         
             19 LIST_APPEND              2 
             22 JUMP_ABSOLUTE            6 
        >>   25 RETURN_VALUE
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Date User Action Args
2011-04-10 20:25:52rhettingersetrecipients: + rhettinger
2011-04-10 20:25:52rhettingersetmessageid: <1302467152.39.0.854888976189.issue11822@psf.upfronthosting.co.za>
2011-04-10 20:25:51rhettingerlinkissue11822 messages
2011-04-10 20:25:51rhettingercreate