id builtin: global id counter stored in the PythonContext instance

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinFunctions.java

@@ -637,7 +637,6 @@ public abstract static class IdNode extends PythonBuiltinNode {
          * The next available global id. We reserve space for all integers to be their own id +
          * offset.
          */
-        private static long GLOBAL_ID = Integer.MAX_VALUE * 2 + 4L;
         private static HiddenKey idKey = new HiddenKey("object_id");
 
         @Child private ReadAttributeFromObjectNode readId = null;
@@ -708,7 +707,7 @@ private Object getId(PythonObject obj) {
             }
             Object id = readId.execute(obj, idKey);
             if (id == NO_VALUE) {
-                id = GLOBAL_ID++;
+                id = getContext().getNextGlobalId();
                 writeId.execute(obj, idKey, id);
             }
             return id;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/PythonContext.java

@@ -31,6 +31,7 @@
 
 import java.io.OutputStream;
 import java.util.HashMap;
+import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.locks.ReentrantLock;
 
 import org.graalvm.options.OptionValues;
@@ -55,6 +56,7 @@ public class PythonContext {
     private PythonModule mainModule;
     private final PythonCore core;
     private final HashMap<Object, CallTarget> atExitHooks = new HashMap<>();
+    private final AtomicLong globalId = new AtomicLong(Integer.MAX_VALUE * 2 + 4L);
 
     @CompilationFinal private TruffleLanguage.Env env;
 
@@ -89,6 +91,10 @@ public PythonContext(PythonLanguage language, TruffleLanguage.Env env, PythonCor
         }
     }
 
+    public long getNextGlobalId() {
+        return globalId.incrementAndGet();
+    }
+
     public OptionValues getOptions() {
         return getEnv().getOptions();
     }