coins.ssa
Class ConstantPropagation

java.lang.Object
  coins.ssa.ConstantPropagation

All Implemented Interfaces:

LocalTransformer, Transformer

class ConstantPropagation

extends java.lang.Object

implements LocalTransformer

Constant Propagation
This constant propagator considers the condition jumps. Only reachable edges and basic blocks are target on.

Reference:
I. Nakata, "The Structure and Optimization of the Compiler," Asakura Shoten, 1999(In Japanese).

Field Summary

static int

THR The threshold of debug print

Constructor Summary

ConstantPropagation(SsaEnvironment e)
Constructor

Method Summary

boolean	doIt(Data data, ImList args) Transform the DATA component.
boolean	doIt(Function function, ImList args) Do constant propagation
java.lang.String	name() Return the name of the transforming engine.
java.lang.String	subject() Return brief description of the tranformation.

Methods inherited from class java.lang.Object

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

Field Detail

THR

public static final int THR

The threshold of debug print

See Also:

Constant Field Values

Constructor Detail

ConstantPropagation

public ConstantPropagation(SsaEnvironment e)

Constructor

Parameters:

e - The environment of the SSA module

Method Detail

doIt

public boolean doIt(Data data,
                    ImList args)

Description copied from interface: LocalTransformer

Transform the DATA component.

Specified by:

doIt in interface LocalTransformer

Parameters:

data - DATA to be transformed.

args - list of optional arguments.

Returns:

true if transformation suceeded.

name

public java.lang.String name()

Description copied from interface: Transformer

Return the name of the transforming engine. Used for trace tag name.

Specified by:

name in interface Transformer

Returns:

the name of the transforming engine.

subject

public java.lang.String subject()

Description copied from interface: Transformer

Return brief description of the tranformation.

Specified by:

subject in interface Transformer

Returns:

brief description of the tranformation.

doIt

public boolean doIt(Function function,
                    ImList args)

Do constant propagation

Specified by:

doIt in interface LocalTransformer

Parameters:

function - The current function

args - list of optional arguments.

Returns:

true if transformation suceeded.