harpoon.Analysis.PreciseGC
Class WriteBarrierConstElim

java.lang.Object
  harpoon.Analysis.Tree.Simplification
      harpoon.Analysis.PreciseGC.WriteBarrierConstElim

public abstract class WriteBarrierConstElim
extends Simplification

WriteBarrierConstElim operates on Tree form. It eliminates write barriers on MOVEs that are assigned from constants. Constant propagation should probably be run beforehand for this pass to make a difference.

If WriteBarrierTreePass is being used, it should be not be run until after this pass.

Version:

$Id: WriteBarrierConstElim.java,v 1.6 2003/03/11 19:15:41 cananian Exp $

Author:

Karen Zee <kkz@tmi.lcs.mit.edu>

Nested Class Summary

Nested classes/interfaces inherited from class harpoon.Analysis.Tree.Simplification

Simplification.Rule

Field Summary

Fields inherited from class harpoon.Analysis.Tree.Simplification

_ADD, _ALIGN, _AND, _BINOP, _CALL, _CJUMP, _CMPEQ, _CMPGE, _CMPGT, _CMPLE, _CMPLT, _CMPNE, _CONST, _CONST0, _CONST1, _CONSTm1, _CONSTNULL, _DATUM, _DIV, _ESEQ, _EXPR, _JUMP, _LABEL, _MEM, _METHOD, _MOVE, _MUL, _NAME, _NATIVECALL, _OR, _REM, _RETURN, _SEGMENT, _SEQ, _SHL, _SHR, _TEMP, _THROW, _UNOP, _USHR, _XOR

Method Summary

static HCodeFactory	codeFactory(Frame f, HCodeFactory parent, Linker linker) Code factory for applying WriteBarrierConstElim/code> to a canonical tree.
static List<Simplification.Rule>	HCE_RULES(Code code, Frame f, HMethod arrayHM, HMethod fieldHM)

Methods inherited from class harpoon.Analysis.Tree.Simplification

_KIND, _OP, codeFactory, contains, simplify

Methods inherited from class java.lang.Object

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

Method Detail

codeFactory

public static HCodeFactory codeFactory(Frame f,
                                       HCodeFactory parent,
                                       Linker linker)

Code factory for applying WriteBarrierConstElim/code> to a canonical tree. Clones the tree before doing transformation in-place.

HCE_RULES

public static List<Simplification.Rule> HCE_RULES(Code code,
                                                  Frame f,
                                                  HMethod arrayHM,
                                                  HMethod fieldHM)