3.4.4.4 Frame Evaluation
The evaluate command is most useful for querying the value of a
variable, either global or local, in the environment of the selected
stack frame, but it can be used more generally to evaluate any
expression.
— Debugger Command:
evaluate expression
Evaluate an expression in the environment of the selected stack frame.
The expression must appear on the same line as the command, however it
may be continued over multiple lines.