The unproxy code for Parent.any can generate a circular reference
in certain situations with classes hierarchies like those in ClockDomain.py.
This patch solves this by marking ouself as visited to make sure the
search does not resolve to a self-reference.
This patch modifies how proxies are traversed and unproxied to allow
chained proxies. The issue that is solved manifested itself when a
proxy during its evaluation ended up being hitting another proxy, and
the second one got evaluated using the object that was originally used
for the first proxy.
For a more tangible example, see the following patch on making the
default clock being inherited from the parent. In this patch, the CPU
clock is a proxy Parent.clock, which is overridden in the system to be
an actual value. This all works fine, but the AlphaLinuxSystem has a
boot_cpu_frequency parameter that is Self.cpu[0].clock.frequency. When
the latter is evaluated, it all happens relative to the current object
of the proxy, i.e. the system. Thus the cpu.clock is evaluated as
Parent.clock, but using the system rather than the cpu as the object
to enquire.
This patch changes the behaviour of the All proxy parameter to not
only consider the direct children, but also do a pre-order depth-first
traversal of the object tree and append all results from the
children.
This is used in a later patch to find all the memories in the system,
independent of where they are located in the hierarchy.
Includes support for printing readable VectorPort and Proxy names
(via __str__).
--HG--
extra : convert_revision : c48534a498b3036fe6ac45ff1606656546c79afb
Significant revamp of Port code.
Some cleanup of SimObject code too, particularly to
make the SimObject and MetaSimObject implementations of
__setattr__ more consistent.
Unproxy code split out of print_ini().
src/python/m5/multidict.py:
Make get() return None by default, to match semantics
of built-in dictionary objects.
--HG--
extra : convert_revision : db73b6cdd004a82a08b2402afd1e16544cb902a4
Some tweaking to deal with mutually recursive imports.
--HG--
rename : src/python/m5/config.py => src/python/m5/SimObject.py
extra : convert_revision : 166f7bfabfd20100e93d26a89382469465859988
