org.jikesrvm.compilers.opt.regalloc
Class RegisterAllocatorState

java.lang.Object
  org.jikesrvm.compilers.opt.regalloc.RegisterAllocatorState

public class RegisterAllocatorState
extends Object

The register allocator currently caches a bunch of state in the IR; This class provides accessors to this state. TODO: Consider caching the state in a lookaside structure. TODO: Currently, the physical registers are STATIC! fix this.

RegisterAllocatorState

public RegisterAllocatorState()

resetPhysicalRegisters

static void resetPhysicalRegisters(IR ir)

Resets the physical register info

setSpill

static void setSpill(Register reg,
                     int spill)

Special use of scratchObject field as "resurrect lists" for real registers TODO: use another field for safety; scratchObject is also used by clan LinearScanLiveAnalysis

getSpill

public static int getSpill(Register reg)

mapOneToOne

static void mapOneToOne(Register A,
                        Register B)

Record that register A and register B are associated with each other in a bijection. The register allocator uses this state to indicate that a symbolic register is presently allocated to a physical register.

getMapping

static Register getMapping(Register r)

Returns:

the register currently mapped 1-to-1 to r

clearOneToOne

static void clearOneToOne(Register r)

Clear any 1-to-1 mapping for register R.