remove some __graalpython__ builtins unless an expert option is set

Author: timfel

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

@@ -197,6 +197,13 @@ public void postInitialize(Python3Core core) {
         PList executableList = PythonObjectFactory.getUncached().createList(arr);
         mod.setAttribute("executable_list", executableList);
         mod.setAttribute("ForeignType", core.lookupType(PythonBuiltinClassType.ForeignObject));
+
+        if (!context.getOption(PythonOptions.EnableDebuggingBuiltins)) {
+            mod.setAttribute("dump_truffle_ast", PNone.NO_VALUE);
+            mod.setAttribute("tdebug", PNone.NO_VALUE);
+            mod.setAttribute("set_storage_strategy", PNone.NO_VALUE);
+            mod.setAttribute("dump_heap", PNone.NO_VALUE);
+        }
     }
 
     private static Object[] convertToObjectArray(String[] arr) {

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

@@ -244,6 +244,9 @@ private PythonOptions() {
     @Option(category = OptionCategory.EXPERT, help = "Set by the launcher to true (false means that GraalPython is being embedded in an application).") //
     public static final OptionKey<Boolean> RunViaLauncher = new OptionKey<>(false);
 
+    @Option(category = OptionCategory.EXPERT, help = "Enable built-in functions on the __graalpython__ module that are useful for debugging.") //
+    public static final OptionKey<Boolean> EnableDebuggingBuiltins = new OptionKey<>(false);
+
     public static final OptionDescriptors DESCRIPTORS = new PythonOptionsOptionDescriptors();
 
     @CompilationFinal(dimensions = 1) private static final OptionKey<?>[] ENGINE_OPTION_KEYS;

mx.graalpython/mx_graalpython.py

@@ -593,6 +593,7 @@ def run_python_unittests(python_binary, args=None, paths=None, aot_compatible=Fa
 
     args = args or []
     args = ["--experimental-options=true",
+            "--python.EnableDebuggingBuiltins",
             "--python.CatchAllExceptions=true"] + args
     exclude = exclude or []
     if env is None: