harpoon.Backend.Maps
Class InlineMap

java.lang.Object
  harpoon.Backend.Maps.InlineMap

Direct Known Subclasses:

DefaultInlineMap

public abstract class InlineMap
extends Object

An InlineMap maps an HField to a boolean value indicated whether the HField can be inlined. We leave the policy decision of whether it is wise to do so to other code, which will also be an InlineMap. So, the idea is that a core InlineMap implements the conservative analysis of inline-safety, then a second inline map takes the first inline map and twiddles the inlining results according to whether or not it thinks inlining is really a good idea, using some heuristic. Or you can leave out the second inline map and its heuristics, which just means you'd like to inline wherever possible. Have I confused everyone yet?

Version:

$Id: InlineMap.java,v 1.2 2002/02/25 21:01:59 cananian Exp $

Author:

Duncan Bryce <duncan@lcs.mit.edu>

Constructor Summary

InlineMap()

Method Summary

abstract boolean	canInline1(HField hf)
abstract boolean	canInline2(HField hf)

Methods inherited from class java.lang.Object

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

Constructor Detail

InlineMap

public InlineMap()

Method Detail

canInline1

public abstract boolean canInline1(HField hf)

Returns:

true if the HField can be inlined using type 1 inlining (the class descriptor for the inlined object is preserved). This can be done even if the field escapes, as long as it is a final field.

canInline2

public abstract boolean canInline2(HField hf)

Returns:

true if the HField should be inlined using type 2 inlining (the class descriptor for the inlined object is omitted). This can only be done if the field doesn't escape. Returning true implies shouldInline1() returns true, too.