Add the '__pyston__' module

it lets scripts control some of the internal options
will be used for interpreter performance tracking

src/runtime/builtin_modules/pyston.cpp

+// Copyright (c) 2014-2015 Dropbox, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "core/types.h"
+#include "runtime/objmodel.h"
+#include "runtime/types.h"
+
+namespace pyston {
+
+BoxedModule* pyston_module;
+
+static Box* setOption(Box* option, Box* value) {
+    if (option->cls != str_cls)
+        raiseExcHelper(TypeError, "option must be a 'string' object but received a '%s'", getTypeName(option));
+    BoxedString* option_string = (BoxedString*)option;
+
+    if (value->cls != int_cls)
+        raiseExcHelper(TypeError, "value must be a 'int' object but received a '%s'", getTypeName(value));
+    bool enable = ((BoxedInt*)value)->n;
+
+    if (option_string->s == "ENABLE_INTERPRETER")
+        ENABLE_INTERPRETER = enable;
+    else if (option_string->s == "ENABLE_OSR")
+        ENABLE_OSR = enable;
+    else if (option_string->s == "ENABLE_REOPT")
+        ENABLE_REOPT = enable;
+    else if (option_string->s == "FORCE_INTERPRETER")
+        FORCE_INTERPRETER = enable;
+    else
+        raiseExcHelper(ValueError, "unknown option name '%s", option_string->s.c_str());
+    return None;
+}
+
+void setupPyston() {
+    pyston_module = createModule("__pyston__", "__builtin__");
+
+    pyston_module->giveAttr("setOption", new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)setOption, UNKNOWN, 2)));
+}
+}

src/runtime/types.cpp

@@ -1241,6 +1241,7 @@ void setupRuntime() {
     setupBuiltins();
     setupThread();
     setupGC();
+    setupPyston();
 
     PyType_Ready(&PyCapsule_Type);
 

src/runtime/types.h

@@ -68,6 +68,7 @@ void teardownDescr();
 
 void setupSys();
 void setupBuiltins();
+void setupPyston();
 void setupThread();
 void setupSysEnd();