--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/core/ObjectSpaceNodes.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.nodes.core;
+
+import java.math.*;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.core.*;
+import com.oracle.truffle.ruby.runtime.objects.*;
+
+@CoreClass(name = "ObjectSpace")
+public abstract class ObjectSpaceNodes {
+
+    @CoreMethod(names = "_id2ref", isModuleMethod = true, needsSelf = false, minArgs = 1, maxArgs = 1)
+    public abstract static class ID2RefNode extends CoreMethodNode {
+
+        public ID2RefNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public ID2RefNode(ID2RefNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public Object id2Ref(int id) {
+            final Object object = getContext().getObjectSpaceManager().lookupId(id);
+
+            if (object == null) {
+                return NilPlaceholder.INSTANCE;
+            } else {
+                return object;
+            }
+        }
+
+        @Specialization
+        public Object id2Ref(BigInteger id) {
+            final Object object = getContext().getObjectSpaceManager().lookupId(id.longValue());
+
+            if (object == null) {
+                return NilPlaceholder.INSTANCE;
+            } else {
+                return object;
+            }
+        }
+
+    }
+
+    @CoreMethod(names = "each_object", isModuleMethod = true, needsSelf = false, needsBlock = true, minArgs = 0, maxArgs = 1)
+    public abstract static class EachObjectNode extends YieldingCoreMethodNode {
+
+        public EachObjectNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public EachObjectNode(EachObjectNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public NilPlaceholder eachObject(VirtualFrame frame, @SuppressWarnings("unused") UndefinedPlaceholder ofClass, RubyProc block) {
+            for (RubyBasicObject object : getContext().getObjectSpaceManager().getObjects()) {
+                yield(frame, block, object);
+            }
+            return NilPlaceholder.INSTANCE;
+        }
+
+        @Specialization
+        public NilPlaceholder eachObject(VirtualFrame frame, RubyClass ofClass, RubyProc block) {
+            for (RubyBasicObject object : getContext().getObjectSpaceManager().getObjects()) {
+                if (object.getRubyClass().assignableTo(ofClass)) {
+                    yield(frame, block, object);
+                }
+            }
+            return NilPlaceholder.INSTANCE;
+        }
+
+    }
+
+    @CoreMethod(names = "define_finalizer", isModuleMethod = true, needsSelf = false, minArgs = 2, maxArgs = 2)
+    public abstract static class DefineFinalizerNode extends CoreMethodNode {
+
+        public DefineFinalizerNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public DefineFinalizerNode(DefineFinalizerNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public RubyProc defineFinalizer(Object object, RubyProc finalizer) {
+            getContext().getObjectSpaceManager().defineFinalizer((RubyBasicObject) object, finalizer);
+            return finalizer;
+        }
+    }
+
+    @CoreMethod(names = {"garbage_collect", "start"}, isModuleMethod = true, needsSelf = false, maxArgs = 0)
+    public abstract static class GarbageCollectNode extends CoreMethodNode {
+
+        public GarbageCollectNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public GarbageCollectNode(GarbageCollectNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public NilPlaceholder garbageCollect() {
+            final RubyThread runningThread = getContext().getThreadManager().leaveGlobalLock();
+
+            try {
+                System.gc();
+            } finally {
+                getContext().getThreadManager().enterGlobalLock(runningThread);
+            }
+
+            return NilPlaceholder.INSTANCE;
+        }
+    }
+
+    @CoreMethod(names = "undefine_finalizer", isModuleMethod = true, needsSelf = false, minArgs = 1, maxArgs = 1)
+    public abstract static class UndefineFinalizerNode extends CoreMethodNode {
+
+        public UndefineFinalizerNode(RubyContext context, SourceSection sourceSection) {
+            super(context, sourceSection);
+        }
+
+        public UndefineFinalizerNode(UndefineFinalizerNode prev) {
+            super(prev);
+        }
+
+        @Specialization
+        public Object undefineFinalizer(Object object) {
+            getContext().getObjectSpaceManager().undefineFinalizer((RubyBasicObject) object);
+            return object;
+        }
+    }
+
+}