Coverage: don't instrument super() calls of Template, fix #16127

compiler/src/dotty/tools/dotc/transform/InstrumentCoverage.scala

@@ -279,6 +279,18 @@ class InstrumentCoverage extends MacroTransform with IdentityDenotTransformer:
             // to the enclosing method, not a tree to instrument.
             cpy.Return(tree)(expr = transform(tree.expr), from = tree.from)
 
+          case tree: Template =>
+            // only transform:
+            // - the arguments of the `Apply` trees in the parents
+            // - the template body
+            cpy.Template(tree)(
+              transformSub(tree.constr),
+              transformTemplateParents(tree.parents)(using ctx.superCallContext),
+              tree.derived,
+              tree.self,
+              transformStats(tree.body, tree.symbol)
+            )
+
           // For everything else just recurse and transform
           case _ =>
             super.transform(tree)
@@ -332,6 +344,21 @@ class InstrumentCoverage extends MacroTransform with IdentityDenotTransformer:
 
       cpy.CaseDef(tree)(pat, transformedGuard, instrumentedBody)
 
+    /** Transforms the parents of a Template. */
+    private def transformTemplateParents(parents: List[Tree])(using Context): List[Tree] =
+      def transformParent(parent: Tree): Tree = parent match
+        case tree: Apply =>
+          // only instrument the args, not the constructor call
+          cpy.Apply(tree)(tree.fun, tree.args.mapConserve(transform))
+        case tree: TypeApply =>
+          // args are types, instrument the fun with transformParent
+          cpy.TypeApply(tree)(transformParent(tree.fun), tree.args)
+        case other =>
+          // should always be a TypeTree, nothing to instrument
+          other
+
+      parents.mapConserve(transformParent)
+
     /** Instruments the body of a DefDef. Handles corner cases.
      * Given a DefDef f like this:
      * ```

tests/coverage/pos/Enum.scoverage.check

@@ -72,142 +72,6 @@ def surfaceWeight
 3
 Enum.scala
 covtest
-$anon
-Class
-covtest.$anon
-<init>
-485
-512
-17
-<init>
-Apply
-false
-0
-false
-Planet(3.303e+23, 2.4397e6)
-
-4
-Enum.scala
-covtest
-$anon
-Class
-covtest.$anon
-<init>
-538
-565
-18
-<init>
-Apply
-false
-0
-false
-Planet(4.869e+24, 6.0518e6)
-
-5
-Enum.scala
-covtest
-$anon
-Class
-covtest.$anon
-<init>
-591
-619
-19
-<init>
-Apply
-false
-0
-false
-Planet(5.976e+24, 6.37814e6)
-
-6
-Enum.scala
-covtest
-$anon
-Class
-covtest.$anon
-<init>
-645
-672
-20
-<init>
-Apply
-false
-0
-false
-Planet(6.421e+23, 3.3972e6)
-
-7
-Enum.scala
-covtest
-$anon
-Class
-covtest.$anon
-<init>
-698
-725
-21
-<init>
-Apply
-false
-0
-false
-Planet(1.9e+27,   7.1492e7)
-
-8
-Enum.scala
-covtest
-$anon
-Class
-covtest.$anon
-<init>
-751
-778
-22
-<init>
-Apply
-false
-0
-false
-Planet(5.688e+26, 6.0268e7)
-
-9
-Enum.scala
-covtest
-$anon
-Class
-covtest.$anon
-<init>
-804
-831
-23
-<init>
-Apply
-false
-0
-false
-Planet(8.686e+25, 2.5559e7)
-
-10
-Enum.scala
-covtest
-$anon
-Class
-covtest.$anon
-<init>
-857
-884
-24
-<init>
-Apply
-false
-0
-false
-Planet(1.024e+26, 2.4746e7)
-
-11
-Enum.scala
-covtest
 EnumTypes$
 Object
 covtest.EnumTypes$
@@ -222,7 +86,7 @@ false
 false
 println("Example 1: \n"+emptyList)
 
-12
+4
 Enum.scala
 covtest
 EnumTypes$
@@ -239,7 +103,7 @@ false
 false
 "Example 1: \n"+emptyList
 
-13
+5
 Enum.scala
 covtest
 EnumTypes$
@@ -256,7 +120,7 @@ false
 false
 println(s"${list}\n")
 
-14
+6
 Enum.scala
 covtest
 EnumTypes$
@@ -273,7 +137,7 @@ false
 false
 s"${list}\n"
 
-15
+7
 Enum.scala
 covtest
 EnumTypes$
@@ -290,7 +154,7 @@ false
 false
 Planet.Earth.surfaceGravity
 
-16
+8
 Enum.scala
 covtest
 EnumTypes$
@@ -308,7 +172,7 @@ false
 for p <- Planet.values do
         println(s"Your weight on $p is ${p.surfaceWeight(mass)}")
 
-17
+9
 Enum.scala
 covtest
 EnumTypes$
@@ -325,7 +189,7 @@ false
 false
 Planet.values
 
-18
+10
 Enum.scala
 covtest
 EnumTypes$
@@ -342,7 +206,7 @@ false
 false
 println(s"Your weight on $p is ${p.surfaceWeight(mass)}")
 
-19
+11
 Enum.scala
 covtest
 EnumTypes$
@@ -359,7 +223,7 @@ false
 false
 s"Your weight on $p is ${p.surfaceWeight(mass)}"
 
-20
+12
 Enum.scala
 covtest
 EnumTypes$
@@ -376,7 +240,7 @@ false
 false
 p.surfaceWeight(mass)
 
-21
+13
 Enum.scala
 covtest
 EnumTypes$
@@ -393,7 +257,7 @@ false
 false
 def calculateEarthWeightOnPlanets
 
-22
+14
 Enum.scala
 covtest
 EnumTypes$
@@ -410,7 +274,7 @@ false
 false
 println("Example 2:")
 
-23
+15
 Enum.scala
 covtest
 EnumTypes$
@@ -427,7 +291,7 @@ false
 false
 calculateEarthWeightOnPlanets(80)
 
-24
+16
 Enum.scala
 covtest
 EnumTypes$

tests/coverage/pos/EnumJava.scoverage.check

@@ -0,0 +1,20 @@
+# Coverage data, format version: 3.0
+# Statement data:
+# - id
+# - source path
+# - package name
+# - class name
+# - class type (Class, Object or Trait)
+# - full class name
+# - method name
+# - start offset
+# - end offset
+# - line number
+# - symbol name
+# - tree name
+# - is branch
+# - invocations count
+# - is ignored
+# - description (can be multi-line)
+# '' sign
+# ------------------------------------------