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hdl.ir: allow returning elaboratables from missing domain callback.

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This allows e.g. injecting a clock/reset generator in platform build
code on demand (i.e. if the domain is not instantiated manually).

See #57.
This commit is contained in:
whitequark 2019-08-03 15:44:02 +00:00
parent fc846532c7
commit cea92e9531
2 changed files with 51 additions and 4 deletions
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18
nmigen/hdl/ir.py
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@ -359,9 +359,23 @@ class Fragment:
if domain_name is None:
continue
if domain_name not in self.domains:
domain = missing_domain(domain_name)
if domain is None:
value = missing_domain(domain_name)
if value is None:
raise DomainError("Domain '{}' is used but not defined".format(domain_name))
if type(value) is ClockDomain:
domain = value
else:
new_fragment = Fragment.get(value, platform=None)
if new_fragment.domains.keys() != {domain_name}:
raise DomainError(
"Fragment returned by missing domain callback should define exactly "
"one domain '{}', but defines domain(s) {}."
.format(domain_name,
", ".join("'{}'".format(n)
for n in new_fragment.domains.keys())))
new_fragment.flatten = True
self.add_subfragment(new_fragment)
domain = new_fragment.domains[domain_name]
self.add_domains(domain)
new_domains.append(domain)
return new_domains