Compiling source code objects to improve efficiency of compiling is described herein. The compiling includes determining, by a compiler, an object type of a to-be-compiled object in source code. A counter is set for the to-be-compiled object. When the object type of the to-be-compiled object is an object type that can be operated by only one thread at one moment, the compiler sets a counter counting rule for the counter of the to-be-compiled object.