Trying to debug Scala Port with valgrind.

Author: viferga

source/ports/scala_port/README.md

@@ -19,3 +19,25 @@ PORT_LIBRARY_PATH
 ```
 
 > Note: You'll find the bindings and the code that runs on `sbt test` in `src/main/scala/MetaCall.scala`.
+
+## Debugging
+
+Uncomment this line in `build.sbt`:
+```
+"-Djava.compiler=NONE",
+```
+
+Build the project:
+```
+sbt compile
+```
+
+For runing valgrind with the correct classpath, run:
+```
+sbt "export test:fullClasspath"
+```
+
+Then copy the classpath into the valgrind command:
+```
+valgrind --tool=memcheck --trace-children=yes --error-limit=no scala -Djava.compiler=NONE -cp <classpath> src/test/scala/MetaCallSpecMain.scala
+```

source/ports/scala_port/build.sbt

@@ -1,28 +1,32 @@
-ThisBuild / scalaVersion := "2.13.4"
-ThisBuild / version := "0.1.0-SNAPSHOT"
-ThisBuild / organization := "com.metacall"
-ThisBuild / organizationName := "metacall"
+lazy val commonSettings = Seq(
+  scalaVersion := "2.13.4",
+  version := "0.1.0-SNAPSHOT",
+  organization := "com.metacall",
+  organizationName := "metacall",
+  scalacOptions ++= Seq(
+    // Only for debugging purposes
+    // "-Djava.compiler=NONE",
+    "-feature",
+    "-deprecation",
+    "-Wunused:imports,patvars,privates,locals,explicits,implicits,params",
+    "-Xlint",
+    "-explaintypes",
+    "-Wdead-code",
+    "-Wextra-implicit",
+    "-Wnumeric-widen",
+    "-Wconf:cat=lint-byname-implicit:silent"
+  ),
+  scalacOptions in (Compile, console) := Seq.empty,
+  libraryDependencies ++= Seq(
+    "net.java.dev.jna" % "jna" % "5.6.0",
+    "org.typelevel" %% "cats-core" % "2.3.1",
+    "org.scalatest" %% "scalatest" % "3.2.2" % Test,
+  )
+)
 
 lazy val root = (project in file("."))
+  .settings(commonSettings: _*)
   .settings(
     name := "metacall",
-    scalacOptions ++= Seq(
-      "-feature",
-      "-deprecation",
-      "-Wunused:imports,patvars,privates,locals,explicits,implicits,params",
-      "-Xlint",
-      "-explaintypes",
-      "-Wdead-code",
-      "-Wextra-implicit",
-      "-Wnumeric-widen",
-      "-Wconf:cat=lint-byname-implicit:silent"
-    ),
-    scalacOptions in (Compile, console) := Seq.empty,
-    libraryDependencies ++= Seq(
-      "net.java.dev.jna" % "jna" % "5.6.0",
-      "org.typelevel" %% "cats-core" % "2.3.1",
-      "org.scalatest" %% "scalatest" % "3.2.2" % Test,
-      "com.lihaoyi" %% "pprint" % "0.5.6" % Test
-    ),
     fork in (Test / run) := true
   )

source/ports/scala_port/src/test/scala/MetaCallSpec.scala

@@ -414,5 +414,4 @@ class MetaCallSpec extends AnyFlatSpec {
       "MetaCall was not successfully destroyed"
     )
   }
-
 }

source/ports/scala_port/src/test/scala/MetaCallSpecMain.scala

@@ -0,0 +1,5 @@
+import metacall._
+
+object Main extends App {
+  (new MetaCallSpec()).execute()
+}

source/ports/scala_port/valgrind.supp

@@ -0,0 +1,6 @@
+{
+   ignore_jvm
+   Memcheck:Leak
+   ...
+   obj:*/libjvm.so*
+}