org.jikesrvm.adaptive.recompilation.instrumentation
Class InsertInstructionCounters

java.lang.Object
  org.jikesrvm.compilers.opt.driver.CompilerPhase
      org.jikesrvm.adaptive.recompilation.instrumentation.InsertInstructionCounters

public class InsertInstructionCounters
extends CompilerPhase

The following OPT phase inserts counters on all instructions in the IR. It maintains one counter for each operand type, so it output how many loads were executed, how many int_add's etc. This is useful for debugging and assessing the accuracy of optimizations.

Note: The counters are added at the end of HIR, so the counts will NOT reflect any changes to the code that occur after HIR.

InsertInstructionCounters

public InsertInstructionCounters()

newExecution

public CompilerPhase newExecution(IR ir)

Return this instance of this phase. This phase contains no per-compilation instance fields.

Overrides:

newExecution in class CompilerPhase

Parameters:

ir - not used

Returns:

this

shouldPerform

public final boolean shouldPerform(OptOptions options)

Description copied from class: CompilerPhase

This method determines if the phase should be run, based on the Options object it is passed. By default, phases are always performed. Subclasses should override this method if they only want to be performed conditionally.

Overrides:

shouldPerform in class CompilerPhase

Parameters:

options - the compiler options for the compilation

Returns:

true if the phase should be performed

getName

public final String getName()

Specified by:

getName in class CompilerPhase

Returns:

a String which is the name of the phase.

perform

public final void perform(IR ir)

Insert a counter on every instruction, and group counts by opcode type.

Specified by:

perform in class CompilerPhase

Parameters:

ir - the governing IR