com.android.dx.ssa
Class InterferenceRegisterMapper

java.lang.Object
  com.android.dx.ssa.RegisterMapper
      com.android.dx.ssa.BasicRegisterMapper
          com.android.dx.ssa.InterferenceRegisterMapper

public class InterferenceRegisterMapper
extends BasicRegisterMapper

A register mapper that keeps track of the accumulated interference information for the registers in the new namespace. Please note that this mapper requires that the old namespace does not have variable register widths/categories, and the new namespace does.

Constructor Summary

InterferenceRegisterMapper(InterferenceGraph oldRegInterference, int countOldRegisters)
Constructs an instance

Method Summary

void	addMapping(int oldReg, int newReg, int category) Adds a mapping to the mapper.
boolean	areAnyPinned(RegisterSpecList oldSpecs, int newReg, int targetCategory) Checks to see if any of a set of old-namespace registers are pinned to the specified new-namespace reg + category.
boolean	interferes(int oldReg, int newReg, int category) Checks to see if old namespace reg oldReg interferes with what currently maps to newReg.
boolean	interferes(RegisterSpec oldSpec, int newReg) Checks to see if old namespace reg oldReg interferes with what currently maps to newReg.

Methods inherited from class com.android.dx.ssa.BasicRegisterMapper

getNewRegisterCount, map, oldToNew, toHuman

Methods inherited from class com.android.dx.ssa.RegisterMapper

map

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

InterferenceRegisterMapper

public InterferenceRegisterMapper(InterferenceGraph oldRegInterference,
                                  int countOldRegisters)

Constructs an instance

Parameters:

countOldRegisters - number of registers in old namespace

Method Detail

addMapping

public void addMapping(int oldReg,
                       int newReg,
                       int category)

Adds a mapping to the mapper. If oldReg has already been mapped, overwrites previous mapping with new mapping.

Overrides:

addMapping in class BasicRegisterMapper

Parameters:

oldReg - >= 0; old register

newReg - >= 0; new register

category - 1..2; width of reg

interferes

public boolean interferes(int oldReg,
                          int newReg,
                          int category)

Checks to see if old namespace reg oldReg interferes with what currently maps to newReg.

Parameters:

oldReg - old namespace register

newReg - new namespace register

category - category of old namespace register

Returns:

true if oldReg will interfere with newReg

interferes

public boolean interferes(RegisterSpec oldSpec,
                          int newReg)

Checks to see if old namespace reg oldReg interferes with what currently maps to newReg.

Parameters:

oldSpec - non-null; old namespace register

newReg - new namespace register

Returns:

true if oldReg will interfere with newReg

areAnyPinned

public boolean areAnyPinned(RegisterSpecList oldSpecs,
                            int newReg,
                            int targetCategory)

Checks to see if any of a set of old-namespace registers are pinned to the specified new-namespace reg + category. Takes into account the category of the old-namespace registers.

Parameters:

oldSpecs - non-null; set of old-namespace regs

newReg - >= 0; new-namespace register

targetCategory - 1..2; the number of adjacent new-namespace registers (starting at ropReg) to consider

Returns:

true if any of the old-namespace register have been mapped to the new-namespace register + category