com.google.javascript.jscomp

Class DeadPropertyAssignmentElimination

java.lang.Object

com.google.javascript.jscomp.DeadPropertyAssignmentElimination

All Implemented Interfaces:

CompilerPass

public class DeadPropertyAssignmentElimination
extends Object
implements CompilerPass

An optimization pass that finds and removes dead property assignments within functions.

This pass does not currently use the control-flow graph. It makes the following assumptions:

• Functions with inner functions are not processed.
• All properties are read whenever entering a block node. Dead assignments within a block are processed.
• Hook nodes are not processed (it's assumed they read everything)
• Switch blocks are not processed (it's assumed they read everything)
• Any reference to a property getter/setter is treated like a call that escapes all props.
• If there's an Object.definePropert{y,ies} call where the object or property name is aliased then the optimization does not run at all.
• Properties names defined in externs will not be pruned.

Method Summary

Methods

Modifier and Type	Method and Description
void	process(Node externs, Node root) Process the JS with root node root.

Methods inherited from class java.lang.Object

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

Method Detail

process

public void process(Node externs,
           Node root)

Description copied from interface: CompilerPass

Process the JS with root node root. Can modify the contents of each Node tree

Specified by:

process in interface CompilerPass

Parameters:

externs - Top of external JS tree

root - Top of JS tree