Returns the block's local context object, or nil if this frame is not a block activation.
Returns the Call object for this frame (created during block/method activation), or nil if this is not a block activation frame.
Returns the number of frames from this frame to the bottom of the stack (inclusive). The bottom frame has depth 1.
Returns a human-readable description of this frame, including the message name, state, and source location.
Returns the locals object (sender context) for this frame.
Returns the Message being evaluated in this frame.
Returns the parent frame, or nil if this is the bottom frame.
Returns the current result value of this frame, or nil.
Returns the current state of this frame as a Symbol (e.g. "start", "activate", "if:evalBranch").
Returns the target (receiver) of the message in this frame.