GATE CSE 1998 | Question: 2.15

Question

Faster access to non-local variables is achieved using an array of pointers to activation records called a 

• A. stack
• B. heap
• C. display
• D. activation tree

Comments

anyone plz explain it!

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https://www.cse.iitk.ac.in/users/swarnendu/courses/spring2020-cs335/Runtime%20Environments.pdf

from page 63-73

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@ShouvikSVK

Thanks :)

Answer 1

Correct Option: C

Properties of displays    

1. Use a pointer array to store the activation records along the static chain.
2. Fast access for non-local but may be complicated to maintain.
3. Calling a subprogram in the same level – simply replace and restore.
4. Calling a subprogram in the higher level – add an entry and may need to save the old pointers.
5. Calling a subprogram in the lower level – shrink the pointer and restore it when the subprogram returns.

http://users.dickinson.edu/~wahlst/356/ch10.pdf

Comments

nice point sachin sir

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thnx @Sachin Mittal 1 sir

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Is this part in syllabus now?