Access link vs Control Link

Question

Access Link :

1) An access link from record A points to the record of the closest enclosing block in the program.

2) The chain of access links traces the static structure (think: scopes) of the program.

3) Refers to non-local data in other activation record. (NOT CLEAR)

Control Link :

1) A control link from record A points to the previous record on the stack.

2) Points to activation record of calling procedure.

3) The chain of control links traces the dynamic execution of the program.

3) Refers to non-local data in other activation record. (NOT CLEAR)

Can anyone explain this line ?

Comments

Thanks man, for wonderful information

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YES @dileepbhagat2196 you are right last one should be from a1 to a21

 

 

 

 

 

 

 

 

 

 

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access link : to access non local data

control link :points to activation record of caller