[ORC] Add RPC and serialization support for Errors and Expecteds.

This patch allows Error and Expected types to be passed to and returned from
RPC functions.

Serializers and deserializers for custom error types (types deriving from the
ErrorInfo class template) can be registered with the SerializationTraits for
a given channel type (see registerStringError in RPCSerialization.h for an
example), allowing a given custom type to be sent/received. Unregistered types
will be serialized/deserialized as StringErrors using the custom type's log
message as the error string.

llvm-svn: 300167

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/ExecutionEngine/Orc/OrcError.cpp b/llvm/lib/ExecutionEngine/Orc/OrcError.cpp
index c1f228c98cb..9e70c4ac1db 100644
--- a/llvm/lib/ExecutionEngine/Orc/OrcError.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/OrcError.cpp
@@ -49,6 +49,9 @@ public:
       return "Unexpected RPC call";
     case OrcErrorCode::UnexpectedRPCResponse:
       return "Unexpected RPC response";
+    case OrcErrorCode::UnknownErrorCodeFromRemote:
+      return "Unknown error returned from remote RPC function "
+             "(Use StringError to get error message)";
     }
     llvm_unreachable("Unhandled error code");
   }