YieldPoints (Jikes RVM API)

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org.jikesrvm.compilers.opt.controlflow
Class YieldPoints

java.lang.Object
  org.jikesrvm.compilers.opt.driver.CompilerPhase
      org.jikesrvm.compilers.opt.controlflow.YieldPoints

public class YieldPoints
extends CompilerPhase
extends CompilerPhase

This class inserts yield points in

1) a method's prologue
2) loop headers
3) (optionally) method exits (epilogue, athrow)

Field Summary

Fields inherited from class org.jikesrvm.compilers.opt.driver.CompilerPhase
`container`

Constructor Summary
`YieldPoints()`

Method Summary
`String`	`getName()` Return the name of this phase
`CompilerPhase`	`newExecution(IR ir)` This phase contains no per-compilation instance fields.
`void`	`perform(IR ir)` Insert yield points in method prologues, loop heads, and method exits
`private void`	`prependYield(BasicBlock bb, Operator yp, int bcIndex, InlineSequence position)` Add a YIELD instruction to the appropriate place for the basic block passed.
`private void`	`processLoopNest(LSTNode n)` Process all loop heads in a loop nest by inserting a backedge yieldpoint in each of them.

Methods inherited from class org.jikesrvm.compilers.opt.driver.CompilerPhase
`dumpIR, dumpIR, getClassConstructor, getCompilerPhaseConstructor, getCompilerPhaseConstructor, performPhase, printingEnabled, reportAdditionalStats, setContainer, shouldPerform, verify`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

YieldPoints

public YieldPoints()

Method Detail

getName

public final String getName()

Return the name of this phase

Specified by:: getName in class CompilerPhase

Returns:: "Yield Point Insertion"

newExecution

public final CompilerPhase newExecution(IR ir)

This phase contains no per-compilation instance fields.

Overrides:: newExecution in class CompilerPhase

Parameters:: ir - the IR that is about to be passed to performPhase
Returns:: an opt compiler phase on which performPhase may be invoked.

perform

public final void perform(IR ir)

Insert yield points in method prologues, loop heads, and method exits

Specified by:: perform in class CompilerPhase

Parameters:: ir - the IR on which to apply the phase

processLoopNest

private void processLoopNest(LSTNode n)

Process all loop heads in a loop nest by inserting a backedge yieldpoint in each of them.

prependYield

private void prependYield(BasicBlock bb,
                          Operator yp,
                          int bcIndex,
                          InlineSequence position)

Add a YIELD instruction to the appropriate place for the basic block passed.

Parameters:: bb - the basic block; yp - the yieldpoint operator to insert; bcIndex - the bcIndex of the yieldpoint; position - the source position of the yieldpoint