Re: [myhdl-list] always_comb exception

[David H. <da...@ad...>]

This fails with both "ipython" and plain "python" (in interactive mode) on
Mac OS X 10.8.5 using prerelease MyHDL 0.8.1 from the repo.

I pasted this text:
from myhdl import *
def Mux(z, a, b, sel):
   @always_comb
   def muxLogic():
     if sel == 1:
       z.next = a
     else:
       z.next = b
   return muxLogic

z, a, b, sel = [Signal(0) for i in range(4)]
mux_1 = Mux(z,a,b,sel)


And got this dump from ipython:

subspace(ttys002):~> ipython
Leopard libedit detected.
Python 2.7.2 (default, Oct 11 2012, 20:14:37)
Type "copyright", "credits" or "license" for more information.

IPython 0.10.1 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: from myhdl import *

In [2]: def Mux(z, a, b, sel):
   ...:    @always_comb
   ...:    def muxLogic():
   ...:      if sel == 1:
   ...:        z.next = a
   ...:      else:
   ...:        z.next = b
   ...:    return muxLogic
   ...:

In [3]: z, a, b, sel = [Signal(0) for i in range(4)]

In [4]: mux_1 = Mux(z,a,b,sel)
---------------------------------------------------------------------------
IOError                                   Traceback (most recent call last)

/Users/dholl/<ipython console> in <module>()

/Users/dholl/<ipython console> in Mux(z, a, b, sel)

/Users/dholl/Library/Python/2.7/lib/python/site-packages/myhdl/_always_comb.pyc
in always_comb(func)
     62             except NameError:
     63                 raise NameError(n)
---> 64     c = _AlwaysComb(func, symdict)
     65     return c
     66

/Users/dholl/Library/Python/2.7/lib/python/site-packages/myhdl/_always_comb.pyc
in __init__(self, func, symdict)
    193         self.func = func
    194         self.symdict = symdict
--> 195         s = inspect.getsource(func)
    196         s = _dedent(s)
    197         tree = ast.parse(s)

/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py
in getsource(object)
    697     or code object.  The source code is returned as a single
string.  An
    698     IOError is raised if the source code cannot be retrieved."""
--> 699     lines, lnum = getsourcelines(object)
    700     return string.join(lines, '')
    701

/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py
in getsourcelines(object)
    686     original source file the first line of code was found.  An
IOError is
    687     raised if the source code cannot be retrieved."""
--> 688     lines, lnum = findsource(object)
    689
    690     if ismodule(object): return lines, 0

/Users/dholl/Library/Python/2.7/lib/python/site-packages/IPython/ultraTB.pyc
in findsource(object)
    143     lines = linecache.getlines(file, globals_dict)
    144     if not lines:
--> 145         raise IOError('could not get source code')
    146
    147     if ismodule(object):

IOError: could not get source code

In [5]:


For completeness, the dump form python is:
Last login: Wed Oct  9 15:24:05 on ttys002
subspace(ttys003):~> python
Python 2.7.2 (default, Oct 11 2012, 20:14:37)
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from myhdl import *
>>> def Mux(z, a, b, sel):
...    @always_comb
...    def muxLogic():
...      if sel == 1:
...        z.next = a
...      else:
...        z.next = b
...    return muxLogic
...
>>> z, a, b, sel = [Signal(0) for i in range(4)]
>>> mux_1 = Mux(z,a,b,sel)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in Mux
  File
"/Users/dholl/Library/Python/2.7/lib/python/site-packages/myhdl/_always_comb.py",
line 64, in always_comb
    c = _AlwaysComb(func, symdict)
  File
"/Users/dholl/Library/Python/2.7/lib/python/site-packages/myhdl/_always_comb.py",
line 195, in __init__
    s = inspect.getsource(func)
  File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py",
line 699, in getsource
    lines, lnum = getsourcelines(object)
  File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py",
line 688, in getsourcelines
    lines, lnum = findsource(object)
  File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/inspect.py",
line 529, in findsource
    raise IOError('source code not available')
IOError: source code not available
>>>





On Wed, Oct 9, 2013 at 2:44 PM, Christopher Felton
<chr...@gm...>wrote:

> On 10/9/2013 1:16 PM, Per Karlsson wrote:
> > I suspect you are running from the interpreter.
> > That won't work, because MyHDL uses inspection.
> > Every piece of MyHDL code has to be written to an actual file somewhere
> (or
> > at least that's how I understand it).
> >
> > Cheers
> > Per
> >
>
> Don't know about the base Python interpreter-shell
> but from the ipython console it works fine.
>
> In [2]: from myhdl import *
>     ...: def Mux(z, a, b, sel):
>     ...:    @always_comb
>     ...:    def muxLogic():
>     ...:      if sel == 1:
>     ...:        z.next = a
>     ...:      else:
>     ...:        z.next = b
>     ...:    return muxLogic
>     ...: z, a, b, sel = [Signal(0) for i in range(4)]
>     ...: mux_1 = Mux(z,a,b,sel)
>     ...:
>
> I can never type it all correct to use the base-shell
> for multiline input, e.g. function definitions :)
>
> Regards,
> Chris
>
>
>
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