1. A computer-readable medium having instructions stored thereon that, when executed by a processor, cause the processor to display a visualization of an execution history of a computer program, the displaying the visualization of the execution history of the computer program comprising: monitoring an execution of one or more computer program instructions of a computer program; storing information about an execution history of the one or more computer program instructions; displaying at least one computer program instruction of the one or more computer program instructions within a graphical user interface; and displaying a visualization of the stored information within a graphical user interface.