Discuss the purpose of the fields of an activation record

Discuss the purpose of the fields of an activation record

Activation Code : Stack allocation collect fixed -storage by using activation record. The activation record contain the following steps - 

• Storage for simple name & pointers to array & other data structures local to the procedure.
• Temporaries for expression evaluation & parameter passing.
• Information regarding attributes for local names & formal parameters, when these cannot be determined at compile time.
• The return address.
• A portion to the activation record of the caller.

It is customary & useful to place immediately above the Activation record Data whose size can't be determined until the procedure is called.

Pointers to the location of these arrays are stored at a fixed position in the activation record. Thus the compiler can generate code to access them indirectly though the top-of-stack pointer & for the array itself. 

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