coins.ssa
Class TranslateToSsa

java.lang.Object
  coins.ssa.TranslateToSsa

All Implemented Interfaces:

LocalTransformer, Transformer

public class TranslateToSsa

extends java.lang.Object

implements LocalTransformer

Translate to the static single assignment form ( SSA form ). There are 3 major forms in SSA form :
1. minimal SSA
2. semi-pruned SSA
3. pruned SSA
The difference among these form is the number of PHI instructions. This class can translate to these 3 forms. This class also fold copy expressions during rename phase.

Field Summary

static int	MINIMAL The minimal SSA form
static int	PRUNED The pruned SSA form
static int	SEMI_PRUNED The semi-pruned SSA form
static int	THR The threshold of the debug print
static int	THR2 The threshold of the debug print

Constructor Summary

(package private)

TranslateToSsa(SsaEnvironment e, SsaSymTab stab, int howToTranslate, boolean withCopyFolding) Constructor

Method Summary

boolean	doIt(Data data, ImList args) Transform the DATA component.
boolean	doIt(Function function, ImList args) Translate to the SSA form.
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

MINIMAL

public static final int MINIMAL

The minimal SSA form

See Also:

Constant Field Values

SEMI_PRUNED

public static final int SEMI_PRUNED

The semi-pruned SSA form

See Also:

Constant Field Values

PRUNED

public static final int PRUNED

The pruned SSA form

See Also:

Constant Field Values

THR

public static final int THR

The threshold of the debug print

See Also:

Constant Field Values

THR2

public static final int THR2

The threshold of the debug print

See Also:

Constant Field Values

Constructor Detail

TranslateToSsa

TranslateToSsa(SsaEnvironment e,
               SsaSymTab stab,
               int howToTranslate,
               boolean withCopyFolding)

Constructor

Parameters:

e - The environment of the SSA form

stab - The current symbol table on SSA form

howToTranslate - Specify the translate method

withCopyFolding - Whether copy fold or not

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)

Translate to the SSA form.

Specified by:

doIt in interface LocalTransformer

Parameters:

function - The current function

args - The list of options

Returns:

true if transformation suceeded.