public boolean hasFunctionName() {
        return ((bitField0_ & 0x00000001) != 0);
      }
<pre>
The fully-qualified name that uniquely identifies the function or
method that is active in this frame (up to 1024 bytes).
</pre>

<code>.google.devtools.cloudtrace.v2.TruncatableString function_name = 1;</code>

@return Whether the functionName field is set.
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/StackTrace.java