Procedure Activations An execution of a procedure starts at the beginning of the procedure body; When the procedure is completed,it returns the control to the point immediately after the place where that procedure is called Each execution of a procedure is called as its activation. Lifetime of an activation of a procedure is the sequence of the steps between the first and the last steps in the execution of that procedure (including the other procedures called by that procedure). If a and b are procedure activations,then their lifetimes are either non- overlapping or are nested. If a procedure is recursive,a new activation can begin before an earlier activation of the same procedure has ended. CS308 Compiler Theory 3Procedure Activations • An execution of a procedure starts at the beginning of the procedure b do dy; • When the procedure is completed, it returns the control to the point i di t l ft th l h th t d i ll d immedi a t e ly after the p lace w here th a t proce dure is call e d. • Each execution of a procedure is called as its activation. • Lif i et ime of ti ti f d i th f th t f an activation o f a proce dure is the sequence o f the s teps between the first and the last steps in the execution of that procedure (including the other procedures called by that procedure) (including the other procedures called by that procedure). • If a and b are procedure activations, then their lifetimes are either non￾overlapping rlappin g or are nested. • If a procedure is recursive, a new activation can begin before an earlier activation of the same procedure has ended. CS308 Compiler Theory 3