org.jikesrvm.compilers.opt.ir.operand

Class MemoryOperand

java.lang.Object

org.jikesrvm.compilers.opt.ir.operand.Operand

org.jikesrvm.compilers.opt.ir.operand.MemoryOperand

public final class MemoryOperand
extends Operand

A memory operand. Used to represent complex addressing modes on CISC machines. A memory operand contains some set of other operands that are used in the address calculation.

May contain 0, 1, or 2 RegisterOperands as well as a scale factor and displacement.

The effective address represented by this operand is:

     [base] + [index]*(2^scale) + disp
 

See Also:

Operand

Field Summary

Fields

Modifier and Type	Field and Description
RegisterOperand	base The base register (may be null)
Offset	disp The displacement
Operand	guard The guard operand that validates this memory access
RegisterOperand	index The index register (may be null)
LocationOperand	loc The location operand describing this memory access
byte	scale The scale value (log power of 2) valid values are 0,1,2,3
byte	size Number of bytes being accessed (1,2,4,8)

Fields inherited from class org.jikesrvm.compilers.opt.ir.operand.Operand

instruction

Constructor Summary

Constructors

Constructor and Description
MemoryOperand(RegisterOperand base, RegisterOperand index, byte scale, Offset disp, byte size, LocationOperand loc, Operand guard)

Method Summary

Modifier and Type	Method and Description
static MemoryOperand	B(RegisterOperand base, byte size, LocationOperand loc, Operand guard)
static MemoryOperand	BD(RegisterOperand base, Offset disp, byte size, LocationOperand loc, Operand guard)
static MemoryOperand	BI(RegisterOperand base, RegisterOperand index, byte size, LocationOperand loc, Operand guard)
static MemoryOperand	BID(RegisterOperand base, RegisterOperand index, Offset disp, byte size, LocationOperand loc, Operand guard)
static MemoryOperand	BIS(RegisterOperand base, RegisterOperand index, byte scale, byte size, LocationOperand loc, Operand guard)
Operand	copy() Return a new operand that is semantically equivalent to this.
static MemoryOperand	D(Address disp, byte size, LocationOperand loc, Operand guard)
static MemoryOperand	I(RegisterOperand base, byte size, LocationOperand loc, Operand guard)
boolean	similar(Operand op) Are two operands semantically equivalent?
String	toString() Return a string rep of the operand (ie the effective address)

Methods inherited from class org.jikesrvm.compilers.opt.ir.operand.Operand

asAddressConstant, asBlock, asBranch, asClassConstant, asCondition, asDoubleConstant, asFloatConstant, asIntConstant, asLocation, asLongConstant, asMemory, asMethod, asNullConstant, asObjectConstant, asRegister, asStackLocation, asStringConstant, asTIBConstant, asType, conservativelyApproximates, getIndexInInstruction, getType, isAddress, isAddressConstant, isBlock, isBranch, isClassConstant, isConstant, isDefinitelyNull, isDouble, isDoubleConstant, isFloat, isFloatConstant, isInt, isIntConstant, isIntLike, isLocation, isLong, isLongConstant, isMemory, isMethod, isMovableObjectConstant, isNullConstant, isObjectConstant, isRef, isRegister, isStackLocation, isStringConstant, isTIBConstant, isTrueGuard, isType, meet

Methods inherited from class java.lang.Object

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

Field Detail

loc

public LocationOperand loc

The location operand describing this memory access

guard

public Operand guard

The guard operand that validates this memory access

base

public RegisterOperand base

The base register (may be null)

index

public RegisterOperand index

The index register (may be null)

scale

public byte scale

The scale value (log power of 2) valid values are 0,1,2,3

disp

public Offset disp

The displacement

size

public byte size

Number of bytes being accessed (1,2,4,8)

Constructor Detail

MemoryOperand

public MemoryOperand(RegisterOperand base,
                     RegisterOperand index,
                     byte scale,
                     Offset disp,
                     byte size,
                     LocationOperand loc,
                     Operand guard)

Method Detail

B

public static MemoryOperand B(RegisterOperand base,
                              byte size,
                              LocationOperand loc,
                              Operand guard)

BI

public static MemoryOperand BI(RegisterOperand base,
                               RegisterOperand index,
                               byte size,
                               LocationOperand loc,
                               Operand guard)

BD

public static MemoryOperand BD(RegisterOperand base,
                               Offset disp,
                               byte size,
                               LocationOperand loc,
                               Operand guard)

BID

public static MemoryOperand BID(RegisterOperand base,
                                RegisterOperand index,
                                Offset disp,
                                byte size,
                                LocationOperand loc,
                                Operand guard)

BIS

public static MemoryOperand BIS(RegisterOperand base,
                                RegisterOperand index,
                                byte scale,
                                byte size,
                                LocationOperand loc,
                                Operand guard)

D

public static MemoryOperand D(Address disp,
                              byte size,
                              LocationOperand loc,
                              Operand guard)

I

public static MemoryOperand I(RegisterOperand base,
                              byte size,
                              LocationOperand loc,
                              Operand guard)

copy

public Operand copy()

Description copied from class: Operand

Return a new operand that is semantically equivalent to this.

Specified by:

copy in class Operand

Returns:

a copy of this

similar

public boolean similar(Operand op)

Description copied from class: Operand

Are two operands semantically equivalent?

Specified by:

similar in class Operand

Parameters:

op - other operand

Returns:

true if this and op are semantically equivalent or false if they are not.

toString

public String toString()

Return a string rep of the operand (ie the effective address)

Overrides:

toString in class Object