refactor(cpp): better handling of unknowns in cpp_hart (#626)

* refactor(cpp): better handling of unknowns in Bits class

* test(cpp): add cpp unit test task

* ci: temporarily disable clang-format

* ci(cpp): add cpp unit test to regression

* ci: add permissions to regress workflow

* fix(cpp): adjust DecodeTree to new defined_by api

* fix(ruby): csr possible_fields_for cache was broken

* fix(cpp): could_be_undefined is not implemented, assume the worst

* refactor(cpp): remove spurious comments in bits.hpp

* ci(clang-format): only temporarily disable clang-format in libhart

---------

Signed-off-by: Derek Hower <[email protected]>

Author: dhower-qc

.clang-format

@@ -2,6 +2,7 @@
 BasedOnStyle: Google
 IndentWidth: 2
 Language: Cpp
+ColumnLimit: 100
 # AlignConsecutiveAssignments: true
 # AlignConsecutiveDeclarations: true
 # AlignEscapedNewlines: Right

.github/workflows/regress.yml

@@ -1,4 +1,7 @@
 name: Regression test
+permissions:
+  contents: read
+  pull-requests: write
 on:
   push:
     branches:
@@ -169,3 +172,14 @@ jobs:
         uses: ./.github/actions/singularity-setup
       - name: Generate Go code
         run: ./do gen:go
+  regress-cpp-unit:
+    runs-on: ubuntu-latest
+    env:
+      SINGULARITY: 1
+    steps:
+      - name: Clone Github Repo Action
+        uses: actions/checkout@v4
+      - name: singularity setup
+        uses: ./.github/actions/singularity-setup
+      - name: Run cpp unit tests
+        run: ./do test:cpp_hart CONFIG=rv64

.pre-commit-config.yaml

@@ -64,6 +64,9 @@ repos:
       - id: clang-format
         types_or: [c++, c]
         files: \.(hpp|cpp)$
+        # TEMPORARILY DISABLE CLANG-FORMAT IN LIBHART
+        # WIll RE-ENABLE WHEN NEXT PATCH COMES THROUGH
+        exclude: backends/cpp_hart_gen
   - repo: https://github.com/psf/black-pre-commit-mirror
     rev: 25.1.0
     hooks: