deffer running post init patches on parse request and not immediately after initialization

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/PythonLanguage.java

@@ -237,9 +237,11 @@ protected void initializeContext(PythonContext context) throws Exception {
     @Override
     protected CallTarget parse(ParsingRequest request) throws Exception {
         PythonContext context = this.getContextReference().get();
-        if (!context.getCore().isInitialized()) {
-            context.getCore().initialize();
+        PythonCore pythonCore = context.getCore();
+        if (!pythonCore.isInitialized()) {
+            pythonCore.initialize();
         }
+        pythonCore.runPostInit();
         context.getOrCreateMainModule(request.getSource().getPath());
 
         // if we are running the interpreter, module 'site' is automatically imported
@@ -248,7 +250,7 @@ protected CallTarget parse(ParsingRequest request) throws Exception {
             // no frame required
             new ImportNode("site").execute(null);
         }
-        PythonParseResult parseResult = context.getCore().getParser().parse(context.getCore(), request.getSource());
+        PythonParseResult parseResult = pythonCore.getParser().parse(pythonCore, request.getSource());
         RootNode root = parseResult.getRootNode();
         root = new TopLevelExceptionHandler(this, root);
         return Truffle.getRuntime().createCallTarget(root);

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/Python3Core.java

@@ -357,10 +357,14 @@ public void initialize() {
         exportCInterface(getContext());
         currentException = null;
         initialized = true;
+    }
 
-        // apply the patches after initialization is done (we need to lookup modules that are mostly
-        // in stdlib)
-        loadFile(POST_INIT_MODULE_NAME, coreHome);
+    @Override
+    public void runPostInit() {
+        if (initialized) {
+            String coreHome = PythonCore.getCoreHomeOrFail();
+            loadFile(POST_INIT_MODULE_NAME, coreHome);
+        } 
     }
 
     public Object duplicate(Map<Object, Object> replacements, Object value) {

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

@@ -123,6 +123,10 @@ public interface PythonCore {
 
     public PythonContext getContext();
 
+    default void runPostInit() {
+
+    }
+
     static void writeWarning(TruffleLanguage.Env env, String warning) {
         if (!LIBPOLYGLOT || env.getOptions().get(PythonOptions.VerboseFlag)) {
             write(env, "WARNING: " + warning);