Question

Show the stack with all activation record instances, including static and dynamic chains, when execution reaches position 1 in the following skeletal program. Assume bigsub is at level 1. function bigsub() { function a(flag) { function b() { ... a(false); ... } // end of b ... if (flag) b(); else c(); ... } // end of a function c() { function d() { ... <------------------------1 } // end of d ... d(); ... } // end of c ... a(true); ... } // end of bigsub The calling sequence for this program for execution to reach d is bigsub calls a a calls b

Answer 1

Answer:

Stack for all the active record instances:

The initial calling sequences is bigsub

-The bigsub calls funa.

• In static chain funa finishes their processes then it return back to bigsub
• In dynamic chain funa finishes their processes then it return back to bigsub

-The funa calls funb.

• In static chain funb finishes their processes then it return back to funa
• In dynamic chain funb finishes their processes then it return back to funa

-The funb calls funa.

• In static chain funa finishes their processes then it return back to bigsub
• In dynamic chain funa finishes their processes then it return back to funb

-The funa calls func.

• In static chain func finishes their processes then it return back to bigsub
• In dynamic chain func finishes their processes then it return back to funa

-The func calls fund.

• In static chain fund finishes their processes then it return back to func
• In dynamic chain fund finishes their processes then it return back to func

Explanation:

See the stack diagram.