SERVER-50754 introduce MakeBSONObjStage and various perf improvements to SBE

1 files changed, 9 insertions, 2 deletions

diff --git a/src/mongo/bson/bsonobj.h b/src/mongo/bson/bsonobj.h
index 12d2d008546..9dee852bcba 100644
--- a/src/mongo/bson/bsonobj.h
+++ b/src/mongo/bson/bsonobj.h
@@ -129,8 +129,6 @@ public:
         // Little endian ordering here, but that is ok regardless as BSON is spec'd to be
         // little endian external to the system. (i.e. the rest of the implementation of
         // bson, not this part, fails to support big endian)
-        static const char kEmptyObjectPrototype[] = {/*size*/ kMinBSONLength, 0, 0, 0, /*eoo*/ 0};
-
         _objdata = kEmptyObjectPrototype;
     }
 
@@ -452,6 +450,13 @@ public:
         return objsize() <= kMinBSONLength;
     }
 
+    /*
+     * Whether this BSONObj is the "empty prototype" special case.
+     */
+    bool isEmptyPrototype() const {
+        return _objdata == kEmptyObjectPrototype;
+    }
+
     /** Alternative output format */
     std::string hexDump() const;
 
@@ -626,6 +631,8 @@ public:
     }
 
 private:
+    static constexpr char kEmptyObjectPrototype[] = {/*size*/ kMinBSONLength, 0, 0, 0, /*eoo*/ 0};
+
     template <typename Generator>
     BSONObj _jsonStringGenerator(const Generator& g,
                                  int pretty,