Activation Tree (cont.) program main; enter main procedure s; enter p begin ..end; enter q procedure p; _exit q procedure q; Center s begin ..end; -exit s begin q;s;end; exit p begin p;s;end; enter s -exit s exit main A Nested Structure CS308 Compiler TheoryActivation Tree (cont.) program main; enter main procedure s; enter p begin ... end; enter q proce dure p; exit q procedure q; enter s begin end; begin ... end; exit s begin q; s; end; exit p begin p; s; end; begin p; s; end; enter s enter s exit s exit main A Nested Structure CS308 Compiler Theory 5