ObjectReplacer (Jikes RVM API)

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org.jikesrvm.compilers.opt.escape
Class ObjectReplacer

java.lang.Object
  org.jikesrvm.compilers.opt.escape.ObjectReplacer

All Implemented Interfaces:: AggregateReplacer

final class ObjectReplacer
extends Object
implements AggregateReplacer
extends Object
implements AggregateReplacer

Class that performs scalar replacement of aggregates for non-array objects

Field Summary
`private IR`	`ir` the IR
`private RVMClass`	`klass` type of the object
`private Register`	`reg` the register holding the object reference

Constructor Summary
`private`	`ObjectReplacer(Register r, RVMClass _klass, IR i)`

Method Summary
`private static boolean`	`containsUnsupportedUse(IR ir, Register reg, RVMClass klass, Set<Register> visited)` Some cases we don't handle yet.
`private static ArrayList<RVMField>`	`getFieldsAsArrayList(RVMClass klass)` Returns a ArrayList, holding the fields of the object
`static ObjectReplacer`	`getReplacer(Instruction inst, IR ir)` Return an object representing this transformation for a given allocation site
`private void`	`scalarReplace(RegisterOperand use, RegisterOperand[] scalars, ArrayList<RVMField> fields, Set<Register> visited)` Replace a given use of a object with its scalar equivalent
`void`	`transform()` Perform the transformation
`private void`	`transform2(Register reg, Instruction defI, RegisterOperand[] scalars, ArrayList<RVMField> fields, Set<Register> visited)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

klass

private final RVMClass klass

type of the object

ir

private final IR ir

the IR

reg

private final Register reg

the register holding the object reference

Constructor Detail

ObjectReplacer

private ObjectReplacer(Register r,
                       RVMClass _klass,
                       IR i)

Parameters:: r - the register holding the object reference; _klass - the type of the object to replace; i - the IR

Method Detail

getReplacer

public static ObjectReplacer getReplacer(Instruction inst,
                                         IR ir)

Return an object representing this transformation for a given allocation site

Parameters:: inst - the allocation site; ir -
Returns:: the object, or null if illegal

transform

public void transform()

Description copied from interface: AggregateReplacer

Perform the transformation

Specified by:: transform in interface AggregateReplacer

transform2

private void transform2(Register reg,
                        Instruction defI,
                        RegisterOperand[] scalars,
                        ArrayList<RVMField> fields,
                        Set<Register> visited)

getFieldsAsArrayList

private static ArrayList<RVMField> getFieldsAsArrayList(RVMClass klass)

Returns a ArrayList, holding the fields of the object

Parameters:: klass - the type of the object

scalarReplace

private void scalarReplace(RegisterOperand use,
                           RegisterOperand[] scalars,
                           ArrayList<RVMField> fields,
                           Set<Register> visited)

Replace a given use of a object with its scalar equivalent

Parameters:: use - the use to replace; scalars - an array of scalar register operands to replace the object's fields with

containsUnsupportedUse

private static boolean containsUnsupportedUse(IR ir,
                                              Register reg,
                                              RVMClass klass,
                                              Set<Register> visited)

Some cases we don't handle yet. TODO: handle them.