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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » EDU.purdue.cs.bloat.codegen 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   EDU.purdue.cs.bloat.codegen.RegisterAllocator

RegisterAllocator
public class RegisterAllocator (Code)
RegisterAllocator performs analysis on a control flow graph and determines the minimum amount of local variables needed in a method.
See Also:   LocalVariable

Inner Class :class IGNode extends GraphNode

Field Summary
final static  floatLOOP_FACTOR
    
final static  intMAX_DEPTH
    
final static  floatMAX_WEIGHT
    
 FlowGraphcfg
    
 Mapcolors
    
 intcolorsUsed
    
 Livenessliveness
    

Constructor Summary
public  RegisterAllocator(FlowGraph cfg, Liveness liveness)
     Constructor.

Method Summary
public  intmaxLocals()
     Returns the maximum number of local variables used by the cfg after its "registers" (local variables) have been allocated.
public  LocalVariablenewLocal(Type type)
     Creates a new local variable in this method (as modeled by the cfg).

Field Detail
LOOP_FACTOR
final static float LOOP_FACTOR(Code)



MAX_DEPTH
final static int MAX_DEPTH(Code)



MAX_WEIGHT
final static float MAX_WEIGHT(Code)



cfg
FlowGraph cfg(Code)



colors
Map colors(Code)



colorsUsed
int colorsUsed(Code)



liveness
Liveness liveness(Code)




Constructor Detail
RegisterAllocator
public RegisterAllocator(FlowGraph cfg, Liveness liveness)(Code)
Constructor. Builds an interference graph based on the expression nodes found in liveness. Traverses the graph and determines which nodes needs to be precolored and which nodes can be coalesced (move statements). Nodes are coalesced and local variables are assigned to expressions.
See Also:   FlowGraph
See Also:   LocalVariable




Method Detail
maxLocals
public int maxLocals()(Code)
Returns the maximum number of local variables used by the cfg after its "registers" (local variables) have been allocated.



newLocal
public LocalVariable newLocal(Type type)(Code)
Creates a new local variable in this method (as modeled by the cfg). Updates the number of local variables appropriately.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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