Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Add Annotation support and conversion to firtool CLI options.

Add numerous tests that are checking the behavior of annotation passing
and consumption by CIRCT.  This adds tests for:

  - InlineInstance
  - FlattenInstance
  - dontTouch (of wires and nodes)
  - forceName (of modules only)
  - Deduplication and doNotDedup

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Change ChiselStage to pass annotations to firtool via a file.  Also, add
logic to remove lots of annotations and convert them to equivalent
firtool options.

Any annotations that we don't know what to do with are passed on to firtool to
let it deal with them.  This has the effect of both communicating things like
DontTouchAnnotation and also providing information to the user that they are
passing annotations that firtool doesn't know how to handle.  To do the latter
checking "-warn-on-unprocessed-annotations" is turned on.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Change the default handover from optimized low FIRRTL to CHIRRTL.  This
is done because CIRCT is an essentially complete FIRRTL compiler now.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Add Scala 2.13, enable 2.13 CI

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

* add mill build system
* bump to Chisel 3.5.0
* use cross build to select Scala version.
* add gitignore
* Add/use Compiler Plugin

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Change "RTL" to "HW"

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Change command line option passed to "firtool" due to upstream change.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Add an option to output using a "*.v" suffix.  This is still using the
CIRCT SystemVerilog back end, though.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

- Add Maven release, Sonatype snapshots, and Javadoc.io badges
- Improve setup instructions

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Add publishing to sonatype

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Add --handover option to lower partially using SFC

Add a "handover" option that augments circt.stage.ChiselStage to lower
using a combination of the Scala FIRRTL Compiler (SFC) followed by
CIRCT.  The handover can be set at CHIRRTL (don't run the SFC), High
FIRRTL, Middle FIRRTL, Low FIRRTL, or Optimized Low FIRRTL.

Include tests of this behavior by looking at the
FirrtlCircuitAnnotation that exists before running CIRCT for different
handover values.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Add CI

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>