src/jdk.vm.ci/share/classes/jdk.vm.ci.code/src/jdk/vm/ci/code/BytecodeFrame.java

@@ -96,10 +96,15 @@
      * position, the interpreter will rethrow the exception instead of executing the bytecode
      * instruction at this position.
      */
     public final boolean rethrowException;
 
+    /**
+     * Specifies if this object represents a frame state in the middle of executing a call. If
+     * true, the arguments to the call have been popped from the stack and the return value (for a
+     * non-void call) has not yet been pushed.
+     */
     public final boolean duringCall;
 
     /**
      * This BCI should be used for frame states that are built for code with no meaningful BCI.
      */