sim: make warning for absent optional parameters optional

This is in support of tag-based checkpoint versioning. It should be
possible to examine an optional parameter in a checkpoint during
unserialization and not have it throw a warning.

2 files changed, 10 insertions, 6 deletions

diff --git a/src/sim/serialize.cc b/src/sim/serialize.cc
index 3127d9a04..0ecf45b6d 100644
--- a/src/sim/serialize.cc
+++ b/src/sim/serialize.cc
@@ -223,12 +223,13 @@ paramIn(CheckpointIn &cp, const string &name, T &param)
 
 template <class T>
 bool
-optParamIn(CheckpointIn &cp, const string &name, T &param)
+optParamIn(CheckpointIn &cp, const string &name, T &param, bool warn)
 {
     const string &section(Serializable::currentSection());
     string str;
     if (!cp.find(section, name, str) || !parseParam(str, param)) {
-        warn("optional parameter %s:%s not present\n", section, name);
+        if (warn)
+            warn("optional parameter %s:%s not present\n", section, name);
         return false;
     } else {
         return true;
@@ -384,7 +385,8 @@ objParamIn(CheckpointIn &cp, const string &name, SimObject * &param)
     template void                                                       \
     paramIn(CheckpointIn &cp, const string &name, type & param);        \
     template bool                                                       \
-    optParamIn(CheckpointIn &cp, const string &name, type & param);     \
+    optParamIn(CheckpointIn &cp, const string &name, type & param,      \
+               bool warn);                                              \
     template void                                                       \
     arrayParamOut(CheckpointOut &os, const string &name,                \
                   type const *param, unsigned size);                    \
diff --git a/src/sim/serialize.hh b/src/sim/serialize.hh
index 561cd5508..e3b761f10 100644
--- a/src/sim/serialize.hh
+++ b/src/sim/serialize.hh
@@ -100,13 +100,15 @@ void paramIn(CheckpointIn &cp, const std::string &name,
 }
 
 template <class T>
-bool optParamIn(CheckpointIn &cp, const std::string &name, T &param);
+bool optParamIn(CheckpointIn &cp, const std::string &name, T &param,
+                bool warn = true);
 
 template <typename DataType, typename BitUnion>
 bool optParamIn(CheckpointIn &cp, const std::string &name,
-                BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
+                BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p,
+                bool warn = true)
 {
-    return optParamIn(cp, name, p.__data);
+    return optParamIn(cp, name, p.__data, warn);
 }
 
 template <class T>