Execution engine and passes work. Documentation and tests updated.

git-svn-id: http://llvm-py.googlecode.com/svn/trunk@4 8d1e9007-1d4e-0410-b67e-1979fd6579aa

llvm/__init__.py

@@ -12,3 +12,28 @@ class LLVMException(Exception):
         Exception.__init__(self, msg)
 
 
+#===----------------------------------------------------------------------===
+# Ownables
+#===----------------------------------------------------------------------===
+
+class Ownable(object):
+
+    def __init__(self, ptr, del_fn):
+        self.ptr = ptr
+        self.owner = None
+        self.del_fn = del_fn
+
+    def _own(self, owner):
+        if self.owner:
+            raise LLVMException, "object already owned"
+        self.owner = owner
+
+    def _disown(self):
+        if not self.owner:
+            raise LLVMException, "not owned"
+        self.owner = None
+
+    def __del__(self):
+        if not self.owner:
+            self.del_fn(self.ptr)
+