sim: Provide a framework for detecting out of data checkpoints and migrating them.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/sim/serialize.hh b/src/sim/serialize.hh
index bc64e74f8..ae20b40c2 100644
--- a/src/sim/serialize.hh
+++ b/src/sim/serialize.hh
@@ -50,6 +50,15 @@ class Serializable;
 class Checkpoint;
 class SimObject;
 
+/** The current version of the checkpoint format.
+ * This should be incremented by 1 and only 1 for every new version, where a new
+ * version is defined as a checkpoint created before this version wont work on
+ * the current version until the checkpoint format is updated. Adding a new
+ * SimObject shouldn't cause the version number to increase, only changes to
+ * existing objects such as serializing/unserializing more stote, changing sizes
+ * of serialized arrays, etc. */
+static const uint64_t gem5CheckpointVersion = 0x0000000000000001;
+
 template <class T>
 void paramOut(std::ostream &os, const std::string &name, const T &param);