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18 Commits

Author SHA1 Message Date
whitequark 7191dd16f9 Use C++11 final/override keywords. 2020-06-18 23:34:52 +00:00
whitequark 98e1080345 flatten: accept processes. 2020-06-09 09:56:23 +00:00
whitequark fbb346ea91 flatten: preserve original object names via hdlname attribute. 2020-06-08 20:19:41 +00:00
whitequark 8d821dbbdb flatten: only prepend $flatten once per wire. 2020-06-08 20:19:41 +00:00
whitequark a1814b732f flatten: make hygienic. 
Before this commit, `flatten` matched the template objects with
the newly created objects solely by their name. Because of this,
it could be confused by code such as:

    module bar();
      $dff a();
    endmodule

    module foo();
      bar b();
      $dff \b.a ();
    endmodule

After this commit, `flatten` avoids every possible case of name
collision.

Fixes #2106.
 2020-06-08 19:30:21 +00:00
whitequark 5a5a9b4ffe flatten: clean up log messages. 2020-06-04 12:22:59 +00:00
whitequark d731fe054b flatten: topologically sort modules. 2020-06-04 12:22:59 +00:00
whitequark 6268bdfe6f flatten: simplify. 
`flatten` cannot derive modules in most cases because that would just
yield processes, and it does not support `-autoproc`; in practice
`flatten` has to be preceded by a call to `hierarchy`, which makes
deriving unnecessary.
 2020-06-04 00:02:12 +00:00
whitequark d3e2100306 flatten: simplify. NFC. 
Remove redundant sigmaps.
 2020-06-04 00:02:12 +00:00
whitequark 66255dab4e flatten: simplify. 
Flattening does not benefit from topologically sorting cells within
a module when processing them.
 2020-06-04 00:02:12 +00:00
whitequark 5d2b6d1394 flatten: simplify. NFC. 
Flatten is non-recursive and doesn't need to keep track of handled
cells.
 2020-06-04 00:02:12 +00:00
whitequark 3c3fa774e5 flatten: simplify. NFC. 
Flattening always does "non-recursive" mapping.
 2020-06-04 00:02:12 +00:00
whitequark e561a3a76f flatten: simplify. NFC. 
The `celltypeMap` always maps `x` to `{x}`.
 2020-06-04 00:02:12 +00:00
whitequark 6783876807 flatten: simplify. NFC. 
The `design` and `map` designs are always the same when flattening.
 2020-06-04 00:02:12 +00:00
whitequark 9338ff66b9 RTLIL: factor out RTLIL::Module::addMemory. NFC. 2020-06-04 00:02:12 +00:00
whitequark ebbbe2156e flatten: rename techmap-related stuff. NFC. 2020-06-04 00:02:12 +00:00
whitequark 76c4ee4ea5 techmap, flatten: remove dead options. 
After splitting the passes, some options can never be activated,
and most conditions involving them become dead. Remove them, and also
all of the newly dead code.
 2020-06-04 00:02:12 +00:00
whitequark 6ac54a74fe flatten: split from techmap. 
Although the two passes started out very similar, they diverged over
time and now have little in common. Moreover, `techmap` is extremely
complex while `flatten` does not have to be, and this complexity
interferes with improving `flatten`.
 2020-06-03 15:34:03 +00:00