com.google.gwt.dev.jjs.impl

Class JChangeTrackingVisitor

java.lang.Object

com.google.gwt.dev.jjs.ast.JVisitor

com.google.gwt.dev.jjs.ast.JModVisitor

com.google.gwt.dev.jjs.impl.JChangeTrackingVisitor

Direct Known Subclasses:

DeadCodeElimination.DeadCodeVisitor, JModVisitorWithTemporaryVariableCreation, MethodCallTightener.MethodCallTighteningVisitor, TypeRemapper, TypeTightener.FixDanglingRefsVisitor, TypeTightener.TightenTypesVisitor

public abstract class JChangeTrackingVisitor
extends JModVisitor

A visitor for optimizing an AST.

Subclasses of JChangeTrackingVisitor should override enter/exit instead of visit/endVisit for JMethod, JConstructor, JVariable and JField

Passes that modify the Java AST while an OptimizerContext is in effect should subclass this class (JChangeTrackingVisitor) instead of JModVisitor or interact with OptimizerContext directly.

Passes that would like to act only on parts of the tree related to the modification that happened since the pass was last run should do something like: String passName = "SomeUniqueNameForThisPass"; int lastSeenOptmizationStep = optimizerContext.getLastStepFor(passName); Set<JMethod> modifiedMethods = optimizerContext.getModifiedMethodsSince(lastSeenOptmizationStep) Set<JField> modifiedFields = optimizerContext.getModifiedFieldsSince(lastSeenOptmizationStep) // compute potentially affected fields and methods and run the optimizer just on those .... // optimizerContext.setLastStepFor(passName, optimizerContext.getCurrentOptimizationStep()); optimizerContext.incOptimizationStep;

Field Summary

Fields inherited from class com.google.gwt.dev.jjs.ast.JVisitor

LVALUE_CONTEXT, UNMODIFIABLE_CONTEXT

Constructor Summary

Constructors

Constructor and Description
JChangeTrackingVisitor(OptimizerContext optimizerCtx)

Method Summary

Modifier and Type	Method and Description
void	endVisit(JConstructor x, Context ctx)
void	endVisit(JField x, Context ctx)
void	endVisit(JMethod x, Context ctx)
void	endVisit(JVariable x, Context ctx)
boolean	enter(JConstructor x, Context ctx)
boolean	enter(JField x, Context ctx)
boolean	enter(JMethod x, Context ctx)
boolean	enter(JVariable x, Context ctx)
void	exit(JConstructor x, Context ctx)
void	exit(JField x, Context ctx)
void	exit(JMethod x, Context ctx)
void	exit(JVariable x, Context ctx)
void	fieldsWereRemoved(Collection<JField> fields)
JField	getCurrentField()
JMethod	getCurrentMethod()
protected void	madeChanges() Call this method to indicate that a visitor has made a change to the tree.
void	methodsWereRemoved(Collection<JMethod> methods)
boolean	visit(JConstructor x, Context ctx)
boolean	visit(JField x, Context ctx)
boolean	visit(JMethod x, Context ctx)
boolean	visit(JVariable x, Context ctx)
void	wasRemoved(JField field)
void	wasRemoved(JMethod method)

Methods inherited from class com.google.gwt.dev.jjs.ast.JModVisitor

accept, accept, accept, acceptImmutable, acceptLvalue, acceptWithInsertRemove, acceptWithInsertRemoveImmutable, checkReplacement, didChange, getNumMods, traverse

Methods inherited from class com.google.gwt.dev.jjs.ast.JVisitor

accept, accept, accept, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, endVisit, translateException, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Constructor Detail

JChangeTrackingVisitor

public JChangeTrackingVisitor(OptimizerContext optimizerCtx)

Method Detail

endVisit

public final void endVisit(JConstructor x,
                           Context ctx)

Overrides:

endVisit in class JVisitor

endVisit

public final void endVisit(JField x,
                           Context ctx)

Overrides:

endVisit in class JVisitor

endVisit

public final void endVisit(JMethod x,
                           Context ctx)

Overrides:

endVisit in class JVisitor

endVisit

public final void endVisit(JVariable x,
                           Context ctx)

Overrides:

endVisit in class JVisitor

enter

public boolean enter(JConstructor x,
                     Context ctx)

enter

public boolean enter(JField x,
                     Context ctx)

enter

public boolean enter(JMethod x,
                     Context ctx)

enter

public boolean enter(JVariable x,
                     Context ctx)

exit

public void exit(JConstructor x,
                 Context ctx)

exit

public void exit(JField x,
                 Context ctx)

exit

public void exit(JMethod x,
                 Context ctx)

exit

public void exit(JVariable x,
                 Context ctx)

getCurrentField

public JField getCurrentField()

getCurrentMethod

public JMethod getCurrentMethod()

visit

public final boolean visit(JConstructor x,
                           Context ctx)

Overrides:

visit in class JVisitor

visit

public final boolean visit(JField x,
                           Context ctx)

Overrides:

visit in class JVisitor

visit

public final boolean visit(JMethod x,
                           Context ctx)

Overrides:

visit in class JVisitor

visit

public final boolean visit(JVariable x,
                           Context ctx)

Overrides:

visit in class JVisitor

wasRemoved

public final void wasRemoved(JField field)

wasRemoved

public final void wasRemoved(JMethod method)

methodsWereRemoved

public final void methodsWereRemoved(Collection<JMethod> methods)

fieldsWereRemoved

public final void fieldsWereRemoved(Collection<JField> fields)

madeChanges

protected final void madeChanges()

Description copied from class: JModVisitor

Call this method to indicate that a visitor has made a change to the tree. Used to determine when the optimization pass can exit.

Overrides:

madeChanges in class JModVisitor