Package EDU.purdue.cs.bloat.tree

Class StackOptimizer

java.lang.Object

EDU.purdue.cs.bloat.tree.StackOptimizer

public class StackOptimizer
extends java.lang.Object

StackOptimizer analyzes the relative distances of various uses of the same definition of a local variable to add dups and swaps to the bytecode and eliminate loads and stores.

Constructor Summary

Constructors

Constructor	Description
StackOptimizer(Block owningBlock)

Method Summary

Modifier and Type	Method	Description
int	dup_x1s(LocalExpr expr)
int	dup_x2s(LocalExpr expr)
int	dups(LocalExpr expr)
void	infoDisplay(LocalExpr expr)
boolean	onStack(LocalExpr expr)
void	optimize()	Optimize runs the algorithm for analyzing the tree, looking for opportunities to replaces stores and loads with dups and swaps.
static void	optimizeCFG(FlowGraph cfg)
boolean	shouldStore(LocalExpr expr)	Various methods used by CodeGenerator, used as an interface into the information in defInfoMap and useInfoMap
boolean	shouldSwap(LocalExpr expr)

Methods inherited from class java.lang.Object

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

Constructor Detail

StackOptimizer

public StackOptimizer(Block owningBlock)

Method Detail

optimizeCFG

public static void optimizeCFG(FlowGraph cfg)

optimize

public void optimize()

Optimize runs the algorithm for analyzing the tree, looking for opportunities to replaces stores and loads with dups and swaps. It initiates several visitors, and information is sotred in defInfoMap and useInfoMap

shouldStore

public boolean shouldStore(LocalExpr expr)

Various methods used by CodeGenerator, used as an interface into the information in defInfoMap and useInfoMap

dups

public int dups(LocalExpr expr)

dup_x1s

public int dup_x1s(LocalExpr expr)

dup_x2s

public int dup_x2s(LocalExpr expr)

onStack

public boolean onStack(LocalExpr expr)

shouldSwap

public boolean shouldSwap(LocalExpr expr)

infoDisplay

public void infoDisplay(LocalExpr expr)