1. A hardware debugging system for debugging a fabricated integrated circuit containing an electronic circuit design, said hardware debugging system comprising: an instrumentor configured to receive a high level HDL description of the electronic circuit design, to determine aspects of the electronic circuit design to be examined or modified during debugging, to determine additional circuitry to be incorporated into the electronic circuit design to facilitate debugging, and to produce a modified high level HDL description of the electronic circuit design by incorporating an HDL description of the additional circuitry into the high level HDL description of the electronic circuit design; a design instrumentation database configured to store information about the additional circuitry including relationships between signals of the electronic circuit design and portions of the modified high level HDL description or the high level HDL description; and a HDL-based hardware debugger configured to debug the fabricated integrated circuit fabricated in accordance with the modified high level HDL description by interacting with the electronic circuit design using the additional circuitry and by operating to present debug information with respect to the modified high level HDL description or the high level HDL description.