[llvm] [llvm-dwarfdump][LineCov 2/3] Add coverage baseline comparison and line table coverage in isolation (PR #183790)

[Stephen Tozer via llvm-commits]

================
@@ -280,7 +285,18 @@ a tab-separated table containing the following columns:
         declaration
       - `LinesCovered` ==> Number of source lines covered by the variable's
         debug information in the input file
-
+      - `Baseline` (empty if :option:`--coverage-baseline` is not specified)
+        ==> Number of source lines covered by the variable's debug information
+        in the baseline
+      - `CoveredRatio` (empty if :option:`--coverage-baseline` is not
+        specified) ==> Ratio of the coverage compared to the baseline
+        (calculated as `LinesCovered/Baseline`)
+      - `LT` (empty if :option:`--coverage-baseline` is not specified) ==>
+        Number of source lines covered in the variable's baseline debug
+        information that are also present in the input file's line table
+      - `LTRatio` (empty if :option:`--coverage-baseline` is not specified) ==>
+        Ratio of the line table coverage compared to the baseline (calculated
+        as `LT/Baseline`)
----------------
SLTozer wrote:

I think `LT` may not be a descriptive-enough name - there's probably a limit to how long the field names can be, but `AvailableLines` might be clearer.

https://github.com/llvm/llvm-project/pull/183790