harpoon.Backend.Analysis
Class MakeGCThreadSafe

java.lang.Object
  harpoon.Analysis.Tree.Simplification
      harpoon.Backend.Analysis.MakeGCThreadSafe

public class MakeGCThreadSafe
extends Simplification

MakeGCThreadSafe adds checks to see whether another thread has caused a GC, and if so, halts the current thread by calling out to the runtime. The check is added to the beginning of each method (after the METHOD node), and to backedges (before JUMPs and CJUMPs that can branch to an earlier node). The purpose of the former is to ensure that all threads halt in a timely manner.

This pass is invoked in harpoon.Main.SAMain.

Version:

$Id: MakeGCThreadSafe.java,v 1.6 2004/02/08 03:20:42 cananian Exp $

Author:

Karen K. Zee <kkz@alum.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(HCodeFactory parent, Frame f) Code factory for adding GC polling calls to a canonical tree.
static List<Simplification.Rule>	HCE_RULES(Code code, Frame f)

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(HCodeFactory parent,
                                       Frame f)

Code factory for adding GC polling calls to a canonical tree. Clones the tree before doing optimization in-place. (Stolen from Analysis.Tree.JumpOptimization; it wouldn't have made any sense to subclass.)

HCE_RULES

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