diff options
| -rw-r--r-- | src/pkg/gob/type.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/pkg/gob/type.go b/src/pkg/gob/type.go index 2ffdfc6a1..ace80d6ad 100644 --- a/src/pkg/gob/type.go +++ b/src/pkg/gob/type.go @@ -37,6 +37,7 @@ type typeId int32 var nextId typeId // incremented for each new type we build var typeLock sync.Mutex // set while building a type +const firstUserId = 64 // lowest id number granted to user type gobType interface { id() typeId @@ -101,6 +102,7 @@ var tString = bootstrapType("string", "", 6) var tWireType = mustGetTypeInfo(reflect.Typeof(wireType{})).id func init() { + // Some magic numbers to make sure there are no surprises. checkId(7, tWireType) checkId(9, mustGetTypeInfo(reflect.Typeof(commonType{})).id) checkId(11, mustGetTypeInfo(reflect.Typeof(structType{})).id) @@ -109,6 +111,12 @@ func init() { for k, v := range idToType { builtinIdToType[k] = v } + // Move the id space upwards to allow for growth in the predefined world + // without breaking existing files. + if nextId > firstUserId { + panicln("nextId too large:", nextId) + } + nextId = firstUserId } // Array type |