diff -r eaa43f765cbd -r 06a0015b6a5c jitcraft/Structures.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jitcraft/Structures.cpp	Mon Jul 23 01:19:44 2012 -0700
@@ -0,0 +1,46 @@
+/* vim: set ts=4 sw=4 tw=99 et
+ *
+ * Copyright (C) 2012 David Anderson
+ *
+ * This file is part of JITCraft.
+ *
+ * JITCraft is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ * 
+ * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * JITCraft. If not, see http://www.gnu.org/licenses/.
+ */
+#include "Structures.h"
+#include "Types.h"
+
+using namespace ke;
+
+StructureBufferBuilder::StructureBufferBuilder()
+  : size_(0)
+{
+}
+
+bool
+StructureBufferBuilder::add(Handle<Type> type, unsigned *offset)
+{
+    *offset = size_;
+
+    if (!type->isTraceable()) {
+        // For now, assume the size of primitives is 4-byte.
+        assert(type->isInt32() || type->isFloat());
+        size_ += 4;
+        return true;
+    }
+
+    if (!offsets_.append(size_))
+        return false;
+
+    size_ += sizeof(Object *);
+    return true;
+}