Add Chrome devtools and DAP tools for debugging (#8344)

Adds chrome-inspector tool and Debug Adapter protocol tool for debugging Enso.

# Important Notes
The chrome devtools seems to be broken (tracked in https://github.com/oracle/graal/issues/7636). Even `graalpy --inspect ...` fails (Chrome devtools freezes after connecting to the server). This PR adds Debug adapter protocol tool for debugging as a workaround for chrome inspector. There is docs in [dap.md](https://github.com/enso-org/enso/pull/8344/files#diff-421574b50574cfe546e86d4b3d32d79b8b2087f2fe204f68e5cf2693af43bbe1)

build.sbt

@@ -1428,7 +1428,9 @@ lazy val runtime = (project in file("engine/runtime"))
         GraalVM.modules.map(_.withConfigurations(Some(Runtime.name)))
       val langs =
         GraalVM.langsPkgs.map(_.withConfigurations(Some(Runtime.name)))
-      necessaryModules ++ langs
+      val tools =
+        GraalVM.toolsPkgs.map(_.withConfigurations(Some(Runtime.name)))
+      necessaryModules ++ langs ++ tools
     },
     Test / javaOptions ++= testLogProviderOptions ++ Seq(
       "-Dpolyglotimpl.DisableClassPathIsolation=true"

docs/debugger/README.md

@@ -15,6 +15,8 @@ used by Enso, broken up as follows:
   Debugger.
 - [**Chrome devtools debugger:**](./chrome-devtools.md) A guide how to debug
   Enso code using Chrome devtools.
+- [**Debug adapter protocol:**](./dap.md) A guide how to debug Enso code using
+  VSCode.
 - [**Debugging Enso and Java code at once:**](./mixed-debugging.md) A
   step-by-step guide how to debug both Enso and Java code in a single debugger.
 - [**Debugging Engine (Runtime) only Java code:**](./runtime-debugging.md) A

docs/debugger/dap.md

@@ -0,0 +1,31 @@
+# Debug Adapter Protocol
+
+[Debug Adapter Protocol](https://www.graalvm.org/latest/tools/dap/) is yet
+another instrument available for a Truffle language. The DAP is a native
+protocol for VSCode and as such, works only via VSCode. To start Enso with DAP
+server waiting for a client to attach, launch enso via:
+
+```
+env JAVA_OPTS='-Dpolyglot.dap' ./built-distribution/enso-engine-*/enso-*/bin/enso --run *.enso
+```
+
+Once DAP server is started and ready for a client to be attached, the following
+output will be printed:
+
+```
+[Graal DAP] Starting server and listening on /127.0.0.1:4711
+```
+
+There is a
+[Launch configuration](https://code.visualstudio.com/docs/editor/debugging#_launch-configurations)
+in the repository in
+[.vscode/launch.json](https://github.com/enso-org/enso/blob/a123cd0d9f4b04d05aae7a5231efba554062188f/.vscode/launch.json#L13-L16)
+with name `Debug Adapter Protocol`, you can start debugging via
+[Run and Debug view](https://code.visualstudio.com/docs/editor/debugging#_run-and-debug-view)
+by selecting the `Debug adapter protocol` configuration and pressing play:
+![image](https://github.com/enso-org/enso/assets/14013887/7f15abfd-b4fa-45d3-a100-142c465b6444)
+
+Another screenshot showing the DAP in action:
+![image](https://github.com/enso-org/enso/assets/14013887/41dd8b80-dbac-4a11-b3e2-97c99e42c507)
+
+Note that the port 4711 is the default port for DAP.

engine/runner/src/main/scala/org/enso/runner/ContextFactory.scala

@@ -11,11 +11,11 @@ import org.enso.polyglot.{
   PolyglotContext,
   RuntimeOptions
 }
-import org.graalvm.polyglot.Engine
+import org.graalvm.polyglot.{Context, Engine}
-import org.graalvm.polyglot.Context
 import org.slf4j.event.Level
 
-import java.io.{File, InputStream, OutputStream}
+import java.io.{ByteArrayOutputStream, File, InputStream, OutputStream}
+import scala.util.{Failure, Success, Using}
 
 /** Utility class for creating Graal polyglot contexts.
   */
@@ -131,14 +131,7 @@ class ContextFactory {
     if (graalpy.exists()) {
       builder.option("python.Executable", graalpy.getAbsolutePath());
     }
-    if (
+    if (engineHasJava()) {
-      Engine
-        .newBuilder()
-        .allowExperimentalOptions(true)
-        .build()
-        .getLanguages()
-        .containsKey("java")
-    ) {
       builder
         .option("java.ExposeNativeJavaVM", "true")
         .option("java.Polyglot", "true")
@@ -148,4 +141,24 @@ class ContextFactory {
     }
     new PolyglotContext(builder.build)
   }
+
+  /** Checks whether the polyglot engine has Espresso.
+    *
+    * Creates a temporary polyglot engine for that and makes sure that it is closed.
+    */
+  private def engineHasJava(): Boolean = {
+    Using(
+      Engine
+        .newBuilder()
+        .allowExperimentalOptions(true)
+        .out(new ByteArrayOutputStream())
+        .err(new ByteArrayOutputStream())
+        .build()
+    ) { engine =>
+      engine.getLanguages.containsKey("java")
+    } match {
+      case Success(ret) => ret
+      case Failure(ex)  => throw new IllegalStateException("unreachable", ex)
+    }
+  }
 }

engine/runtime/src/test/java/org/enso/interpreter/test/DebuggingEnsoTest.java

@@ -457,17 +457,20 @@ public class DebuggingEnsoTest {
         .collect(Collectors.toList());
   }
 
-  @Ignore
   @Test
   public void testSteppingOver() {
     Source src = createEnsoSource("""
-        baz x = x      # 1
+        baz x = x        # 1
-        bar x = baz x  # 2
+        bar x =          # 2
-        foo x =        # 3
+            ret = baz x  # 3
-            bar 42     # 4
+            ret          # 4
-            end = 0    # 5
+        foo x =          # 5
+            bar 42       # 6
+            end = 0      # 7
         """);
-    List<Integer> expectedLineNumbers = List.of(3, 4, 5);
+    // Steps into line 2 - declaration of the method, which is fine.
+    // (5, 6, 7) would be better.
+    List<Integer> expectedLineNumbers = List.of(5, 6, 2, 7);
     Queue<SuspendedCallback> steps = createStepOverEvents(expectedLineNumbers.size());
     testStepping(src, "foo", new Object[]{0}, steps, expectedLineNumbers);
   }
@@ -475,6 +478,10 @@ public class DebuggingEnsoTest {
   /**
    * Use some methods from Vector in stdlib. Stepping over methods from different
    * modules might be problematic.
+   *
+   * TODO[pm] This test is ignored, because the current behavior of step over is that it first
+   *          steps into the declaration (name) of the method that is being stepped over and then
+   *          steps back. So there would be weird line numbers from std lib.
    */
   @Ignore
   @Test

project/GraalVM.scala

@@ -79,7 +79,11 @@ object GraalVM {
     "org.graalvm.tools"    % "profiler-tool"        % version
   )
 
-  val toolsPkgs = chromeInspectorPkgs
+  val debugAdapterProtocolPkgs = Seq(
+    "org.graalvm.tools" % "dap-tool" % version
+  )
+
+  val toolsPkgs = chromeInspectorPkgs ++ debugAdapterProtocolPkgs
 
   // TODO: Add graalvmPython
   val langsPkgs = jsPkgs

project/JPMSUtils.scala

@@ -33,7 +33,7 @@ object JPMSUtils {
     * When invoking the `java` command, these modules need to be put on the module-path.
     */
   val componentModules: Seq[ModuleID] =
-    GraalVM.modules ++ GraalVM.langsPkgs ++ Seq(
+    GraalVM.modules ++ GraalVM.langsPkgs ++ GraalVM.toolsPkgs ++ Seq(
       "org.slf4j"      % "slf4j-api"       % slf4jVersion,
       "ch.qos.logback" % "logback-classic" % logbackClassicVersion,
       "ch.qos.logback" % "logback-core"    % logbackClassicVersion