PolyglotEngine.Language.getGlobalObject may initialize the language and as such it needs to be treated as an execution

Author: Jaroslav Tulach

truffle/com.oracle.truffle.api.vm/src/com/oracle/truffle/api/vm/PolyglotEngine.java

@@ -795,11 +795,15 @@ public Value eval(Source source) throws IOException {
          * @return the global object or <code>null</code> if the language does not support such
          *         concept
          */
+        @SuppressWarnings("try")
         public Value getGlobalObject() {
             checkThread();
-
-            Object res = SPI.languageGlobal(getEnv(true));
-            return res == null ? null : new Value(new TruffleLanguage[]{info.getImpl(true)}, res);
+            try (Closeable d = SPI.executionStart(PolyglotEngine.this, -1, debugger, null)) {
+                Object res = SPI.languageGlobal(getEnv(true));
+                return res == null ? null : new Value(new TruffleLanguage[]{info.getImpl(true)}, res);
+            } catch (IOException ex) {
+                throw new IllegalStateException(ex);
+            }
         }
 
         TruffleLanguage<?> getImpl(boolean create) {

truffle/com.oracle.truffle.sl.test/src/com/oracle/truffle/sl/test/SLPolyglotTest.java

@@ -44,12 +44,16 @@
 
 import com.oracle.truffle.api.vm.PolyglotEngine;
 import com.oracle.truffle.api.vm.PolyglotEngine.Language;
+import java.io.IOException;
+import static org.junit.Assert.assertNotNull;
 
 public class SLPolyglotTest {
     @Test
-    public void accessGlobalObject() {
+    public void accessGlobalObject() throws IOException {
         PolyglotEngine vm = PolyglotEngine.newBuilder().build();
         Language lang = vm.getLanguages().get("application/x-sl");
-        lang.getGlobalObject();
+        PolyglotEngine.Value global = lang.getGlobalObject();
+        Object globalValue = global.get();
+        assertNotNull("There is global context in SL", globalValue);
     }
 }