Add a very simple 'gc' module

src/runtime/builtin_modules/gc.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 "gc/collector.h"
+#include "runtime/types.h"
+
+namespace pyston {
+
+Box* gcCollect() {
+    gc::runCollection();
+    return None;
+}
+
+void setupGC() {
+    BoxedModule* gc_module = createModule("gc", "__builtin__");
+
+    gc_module->giveAttr("__hex__", new BoxedFunction(boxRTFunction((void*)gcCollect, NONE, 0)));
+}
+}

src/runtime/types.cpp

@@ -57,6 +57,8 @@ extern "C" void initsignal();
 
 namespace pyston {
 
+void setupGC();
+
 bool IN_SHUTDOWN = false;
 
 #define SLICE_START_OFFSET ((char*)&(((BoxedSlice*)0x01)->start) - (char*)0x1)
@@ -1161,6 +1163,7 @@ void setupRuntime() {
     setupBuiltins();
     setupTime();
     setupThread();
+    setupGC();
 
     setupCAPI();