NPhysicalRegister (j-- (A Non-trivial Subset of Java))

java.lang.Object
- jminusminus.NRegister
- - jminusminus.NPhysicalRegister

 class NPhysicalRegister
extends NRegister

An abstraction for a physical (SPIM) register.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`A0` Argument 1.
`static int`	`A1` Argument 2.
`static int`	`A2` Argument 3.
`static int`	`A3` Argument 4.
`static int`	`AT` Reserved for assembler.
`static int`	`FP` Frame pointer.
`static int`	`GP` Pointer to global area.
`static int`	`K0` Reserved for OS kernel.
`static int`	`K1` Reserved for OS kernel.
`static int`	`MAX_COUNT` Maximum number of physical registers used for allocation, starting at T0.
`static int`	`RA` Return address (used by function call).
`static NPhysicalRegister[]`	`regInfo` Maps register number to the register's representation.
`static int`	`S0` Temporary (preserved across call).
`static int`	`S1` Temporary (preserved across call).
`static int`	`S2` Temporary (preserved across call).
`static int`	`S3` Temporary (preserved across call).
`static int`	`S4` Temporary (preserved across call).
`static int`	`S5` Temporary (preserved across call).
`static int`	`S6` Temporary (preserved across call).
`static int`	`S7` Temporary (preserved across call).
`static int`	`SP` Stack pointer.
`static int`	`T0` Temporary (not preserved across call).
`static int`	`T1` Temporary (not preserved across call).
`static int`	`T2` Temporary (not preserved across call).
`static int`	`T3` Temporary (not preserved across call).
`static int`	`T4` Temporary (not preserved across call).
`static int`	`T5` Temporary (not preserved across call).
`static int`	`T6` Temporary (not preserved across call).
`static int`	`T7` Temporary (not preserved across call).
`static int`	`T8` Temporary (not preserved across call).
`static int`	`T9` Temporary (not preserved across call).
`static int`	`V0` Expression evaluation and results of a function.
`static int`	`V1` Expression evaluation and results of a function.
`static int`	`ZERO` Constant 0.

Fields inherited from class jminusminus.NRegister
name, number

Constructor Summary

Constructors
Constructor and Description

NPhysicalRegister(int number, String name)
Construct an NPhysicalRegister.

Constructors
Constructor and Description
`NPhysicalRegister(int number, String name)` Construct an NPhysicalRegister.

Method Summary

Methods
Modifier and Type Method and Description

String toString()
Return a string representation of this physical register.
- Methods inherited from class jminusminus.NRegister
  name, number
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods
Modifier and Type	Method and Description
`String`	`toString()` Return a string representation of this physical register.

- Field Detail
  - MAX_COUNT
```
public static int MAX_COUNT
```
    Maximum number of physical registers used for allocation, starting at T0.
  - ZERO
```
public static final int ZERO
```
    Constant 0.
    
    See Also:
    Constant Field Values
  - AT
```
public static final int AT
```
    Reserved for assembler.
    
    See Also:
    Constant Field Values
  - V0
```
public static final int V0
```
    Expression evaluation and results of a function.
    
    See Also:
    Constant Field Values
  - V1
```
public static final int V1
```
    Expression evaluation and results of a function.
    
    See Also:
    Constant Field Values
  - A0
```
public static final int A0
```
    Argument 1.
    
    See Also:
    Constant Field Values
  - A1
```
public static final int A1
```
    Argument 2.
    
    See Also:
    Constant Field Values
  - A2
```
public static final int A2
```
    Argument 3.
    
    See Also:
    Constant Field Values
  - A3
```
public static final int A3
```
    Argument 4.
    
    See Also:
    Constant Field Values
  - T0
```
public static final int T0
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T1
```
public static final int T1
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T2
```
public static final int T2
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T3
```
public static final int T3
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T4
```
public static final int T4
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T5
```
public static final int T5
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T6
```
public static final int T6
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T7
```
public static final int T7
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - S0
```
public static final int S0
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - S1
```
public static final int S1
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - S2
```
public static final int S2
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - S3
```
public static final int S3
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - S4
```
public static final int S4
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - S5
```
public static final int S5
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - S6
```
public static final int S6
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - S7
```
public static final int S7
```
    Temporary (preserved across call).
    
    See Also:
    Constant Field Values
  - T8
```
public static final int T8
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - T9
```
public static final int T9
```
    Temporary (not preserved across call).
    
    See Also:
    Constant Field Values
  - K0
```
public static final int K0
```
    Reserved for OS kernel.
    
    See Also:
    Constant Field Values
  - K1
```
public static final int K1
```
    Reserved for OS kernel.
    
    See Also:
    Constant Field Values
  - GP
```
public static final int GP
```
    Pointer to global area.
    
    See Also:
    Constant Field Values
  - SP
```
public static final int SP
```
    Stack pointer.
    
    See Also:
    Constant Field Values
  - FP
```
public static final int FP
```
    Frame pointer.
    
    See Also:
    Constant Field Values
  - RA
```
public static final int RA
```
    Return address (used by function call).
    
    See Also:
    Constant Field Values
  - regInfo
```
public static final NPhysicalRegister[] regInfo
```
    Maps register number to the register's representation.
- Constructor Detail
  - NPhysicalRegister
```
public NPhysicalRegister(int number,
                 String name)
```
    Construct an NPhysicalRegister.
    
    Parameters:
    number - number of the register.
    name - name of the register.
- Method Detail
  - toString
```
public String toString()
```
    Return a string representation of this physical register.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    string representation.

Class NPhysicalRegister

Field Summary

Fields inherited from class jminusminus.NRegister

Constructor Summary

Method Summary

Methods inherited from class jminusminus.NRegister

Methods inherited from class java.lang.Object

Field Detail

MAX_COUNT

ZERO

AT

V0

V1

A0

A1

A2

A3

T0

T1

T2

T3

T4

T5

T6

T7

S0

S1

S2

S3

S4

S5

S6

S7

T8

T9

K0

K1

GP

SP

FP

RA

regInfo

Constructor Detail

NPhysicalRegister

Method Detail

toString