Package org.apache.sysds.hops.rewrite

Class StatementBlockRewriteRule

java.lang.Object

org.apache.sysds.hops.rewrite.StatementBlockRewriteRule

Direct Known Subclasses:

MarkForLineageReuse, RewriteCompressedReblock, RewriteForLoopVectorization, RewriteHoistLoopInvariantOperations, RewriteInjectSparkLoopCheckpointing, RewriteMarkLoopVariablesUpdateInPlace, RewriteMergeBlockSequence, RewriteRemoveEmptyBasicBlocks, RewriteRemoveForLoopEmptySequence, RewriteRemoveUnnecessaryBranches, RewriteSplitDagDataDependentOperators, RewriteSplitDagUnknownCSVRead

public abstract class StatementBlockRewriteRule
extends Object

Base class for all hop rewrites in order to enable generic application of all rules.

Constructor Summary

Constructors

Constructor	Description
StatementBlockRewriteRule()

Method Summary

Modifier and Type	Method	Description
static String	createCutVarName(boolean fun)
abstract boolean	createsSplitDag()	Indicates if the rewrite potentially splits dags, which is used for phase ordering of rewrites.
abstract List<StatementBlock>	rewriteStatementBlock(StatementBlock sb, ProgramRewriteStatus state)	Handle an arbitrary statement block.
abstract List<StatementBlock>	rewriteStatementBlocks(List<StatementBlock> sbs, ProgramRewriteStatus state)	Handle a list of statement blocks.

Methods inherited from class java.lang.Object

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

Constructor Detail

StatementBlockRewriteRule

public StatementBlockRewriteRule()

Method Detail

createCutVarName

public static String createCutVarName(boolean fun)

createsSplitDag

public abstract boolean createsSplitDag()

Indicates if the rewrite potentially splits dags, which is used for phase ordering of rewrites.

Returns:

true if dag splits are possible.

rewriteStatementBlock

public abstract List<StatementBlock> rewriteStatementBlock(StatementBlock sb,
                                                           ProgramRewriteStatus state)

Handle an arbitrary statement block. Specific type constraints have to be ensured within the individual rewrites. If a rewrite does not apply to individual blocks, it should simply return the input block.

Parameters:

sb - statement block

state - program rewrite status

Returns:

list of statement blocks

rewriteStatementBlocks

public abstract List<StatementBlock> rewriteStatementBlocks(List<StatementBlock> sbs,
                                                            ProgramRewriteStatus state)

Handle a list of statement blocks. Specific type constraints have to be ensured within the individual rewrites. If a rewrite does not require sequence access, it should simply return the input list of statement blocks.

Parameters:

sbs - list of statement blocks

state - program rewrite status

Returns:

list of statement blocks