Variables have to be stored. There are two kinds of places: saved in a register, or in the frame. Access abstracts both. More...

#include <access.hh>

Inheritance diagram for frame::Access:

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Public Member Functions
	Access ()
virtual	~Access ()
virtual std::ostream &	dump (std::ostream &ostr) const =0
	Used for debugging.
virtual tree::rExp	exp () const
	Return a Tree expression that gives the location of THIS. If it is in the frame, then the result is something like Mem (Temp fp + OFFSET).
virtual tree::rExp	exp (const tree::rExp &fp) const =0
	Same as above, but use FP instead of `Temp fp'. Useful to access escaped variables.
virtual Access *	clone () const =0
	Return a copy of the actual Access.

Detailed Description

Variables have to be stored. There are two kinds of places: saved in a register, or in the frame. Access abstracts both.

Actually, so called register here are temporaries, i.e., we pretend there is an infinite set of registers. Later in the compiler, when allocating the registers, temporaries will be mapped onto real registers (maybe spilling some temporaries into the frame).

An Access is the abstraction of this: either In_Register, or In_Frame.