The object query
get_* commands have a common option to filter the
query based on any property value attached to the object. This is a powerful capability
for the object query commands. For example, to query all cells of primitive type FD do
the following:-
get_cells * -hierarchical -filter “lib_cell == FD”
To do more elaborate string filtering, utilize the =~ operator to do string pattern
matching. For example, to query all flip-flop types in the design, do the following:
-
get_cells * -hierarchical -filter “lib_cell =~ FD*”
Multiple filter properties can be combined with other property filters with logical OR
(||) and AND (&&) operators to make very powerful searches. To query every cell
in the design that if of any flop type and has a placed location constraint:
-
get_cells * -hierarchical -filter {lib_cell =~ FD* && loc != “”}
Note: In the example, the filter option value was wrapped with curly braces {}
instead of double quotes. This is normal Tcl syntax that prevents command
substitution by the interpreter and allows users to pass the empty string (“”) to
the loc property.