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generation for function code is base on the runtime storage. The runtime
storage can by static allocation or stack allocation. In case of static
allocation the position of activation record in memory is fixed at the compile
time. To recollect about activation record, whenever a function is called,
activation records are generated, these records store the parameters to be
passed to functions, local data, temporaries, results & some machine status
information along with the return address. In case of stack allocation, every
time a function is called, the new activation record in generated & is
pushed onto stack, once the function completes, the activation record is popped
from stack. The three address code for function call consists of following
statements
1.
Call.
2.
Return
3.
end
4.
action
Call
statement is used for function Call, it has to mail the control to the function
along with saving the status of current function.
Return statement is used to give the control
back to called function. Action defines other operations or instructions for
assignment or flow control statements. End indicates the completion of
operations of called function.
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