private com.google.protobuf.RepeatedFieldBuilderV3<
              com.google.devtools.cloudtrace.v2.StackTrace.StackFrame,
              com.google.devtools.cloudtrace.v2.StackTrace.StackFrame.Builder,
              com.google.devtools.cloudtrace.v2.StackTrace.StackFrameOrBuilder>
          getFrameFieldBuilder() {
        if (frameBuilder_ == null) {
          frameBuilder_ =
              new com.google.protobuf.RepeatedFieldBuilderV3<
                  com.google.devtools.cloudtrace.v2.StackTrace.StackFrame,
                  com.google.devtools.cloudtrace.v2.StackTrace.StackFrame.Builder,
                  com.google.devtools.cloudtrace.v2.StackTrace.StackFrameOrBuilder>(
                  frame_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
          frame_ = null;
        }
        return frameBuilder_;
      }
<pre>
Stack frames in this call stack.
</pre>

<code>repeated .google.devtools.cloudtrace.v2.StackTrace.StackFrame frame = 1;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/StackTrace.java