Genericize LKQL: get rid of Libadalang.CompletionItemIterator reference

This is not required and do not exposed by LangkitSupport.

TODO: why do we need those Truffle boundaries now?

Author: thvnx

lkql_jit/language/src/main/java/com/adacore/lkql_jit/runtime/values/LKQLProperty.java

@@ -9,7 +9,6 @@
 import com.adacore.lkql_jit.exception.LKQLRuntimeException;
 import com.adacore.lkql_jit.nodes.arguments.ArgList;
 import com.adacore.lkql_jit.runtime.values.bases.BasicLKQLValue;
-import com.adacore.lkql_jit.utils.LKQLTypesHelper;
 import com.adacore.lkql_jit.utils.functions.ObjectUtils;
 import com.adacore.lkql_jit.utils.functions.ReflectionUtils;
 import com.oracle.truffle.api.CompilerDirectives;
@@ -73,6 +72,7 @@ public boolean isField() {
      * @param caller The locatable which called the execution.
      * @param arguments The argument for the property call.
      */
+    @CompilerDirectives.TruffleBoundary
     public Object executeAsProperty(Node caller, ArgList argList, Object... arguments) {
         try {
             return ReflectionUtils.callProperty(
@@ -83,10 +83,7 @@ public Object executeAsProperty(Node caller, ArgList argList, Object... argument
                 arguments
             );
         } catch (com.adacore.lkql_jit.exception.utils.UnsupportedTypeException e) {
-            throw LKQLRuntimeException.unsupportedType(
-                LKQLTypesHelper.category(e.getType()),
-                caller
-            );
+            throw LKQLRuntimeException.unsupportedType(e.getType().getSimpleName(), caller);
         }
     }
 
@@ -95,14 +92,12 @@ public Object executeAsProperty(Node caller, ArgList argList, Object... argument
      *
      * @param caller The locatable which called the execution.
      */
+    @CompilerDirectives.TruffleBoundary
     public Object executeAsField(Node caller) {
         try {
             return ReflectionUtils.callProperty(this.node, this.description, caller, null);
         } catch (com.adacore.lkql_jit.exception.utils.UnsupportedTypeException e) {
-            throw LKQLRuntimeException.unsupportedType(
-                LKQLTypesHelper.category(e.getType()),
-                caller
-            );
+            throw LKQLRuntimeException.unsupportedType(e.getType().getSimpleName(), caller);
         }
     }
 

lkql_jit/language/src/main/java/com/adacore/lkql_jit/utils/LKQLTypesHelper.java

@@ -216,22 +216,6 @@ public static String debugName(Class<?> type) {
         }
     }
 
-    /**
-     * Get the category of value for the given Java type. This category represents a kind of value
-     * from Libadalang which cannot be imported in the LKQL context.
-     *
-     * @param type The type to get the category for.
-     * @return The type category.
-     */
-    @CompilerDirectives.TruffleBoundary
-    public static String category(Class<?> type) {
-        if (type == Libadalang.CompletionItemIterator.class) {
-            return "ITERATOR_CATEGORY";
-        } else {
-            return type.getSimpleName();
-        }
-    }
-
     /**
      * Convert a Java value into a LKQL value.
      *

testsuite/tests/interpreter_errors/call_property_wrong_return_type/test.out

@@ -1,3 +1,3 @@
-script.lkql:2:7: error: Unsupported value type from the introspection API: ITERATOR_CATEGORY
+script.lkql:2:7: error: Unsupported value type from the introspection API: CompletionItemIterator
 2 | print(names[1].p_complete())
   |       ^^^^^^^^^^^^^^^^^^^^^