harpoon.Backend.Maps
Interface BackendDerivation

All Superinterfaces:

Derivation, TypeMap

public interface BackendDerivation
extends Derivation

BackendDerivation provides, in addition to the type and derivation information provided by Analysis.Maps.Derivation, a means to identify (polymorphically typed) callee-save registers.

Note that BackendDerivation extends Derivation, so non-callee-save-register values will continue to have class and derivation types. The typeMap() and derivation() functions should both return null if the temporary in question is holding a callee-save register value.

Version:

$Id: BackendDerivation.java,v 1.2 2002/02/25 21:01:55 cananian Exp $

Author:

C. Scott Ananian <cananian@alumni.princeton.edu>

Nested Class Summary

static interface

BackendDerivation.Register

Nested classes/interfaces inherited from interface harpoon.Analysis.Maps.Derivation

Derivation.DList

Nested classes/interfaces inherited from interface harpoon.Analysis.Maps.TypeMap

TypeMap.TypeNotKnownException

Method Summary

BackendDerivation.Register

calleeSaveRegister(HCodeElement hce, Temp t) Map compiler temporaries to the callee-save register location they correspond to.

Methods inherited from interface harpoon.Analysis.Maps.Derivation

derivation

Methods inherited from interface harpoon.Analysis.Maps.TypeMap

typeMap

Method Detail

calleeSaveRegister

BackendDerivation.Register calleeSaveRegister(HCodeElement hce,
                                              Temp t)

Map compiler temporaries to the callee-save register location they correspond to.

Parameters:

t - The temporary to query.

hce - A definition point for t.

Returns:

null if the temporary does not hold the value of a callee-save register, or else the identity of the callee-save register.

Throws:

NullPointerException - if t or hc is null.

TypeNotKnownException - if the BackendDerivation has no information about t as defined at hce.