org.jikesrvm.compilers.opt.hir2lir
Class ExpandRuntimeServices

java.lang.Object
  org.jikesrvm.compilers.opt.driver.CompilerPhase
      org.jikesrvm.compilers.opt.hir2lir.ExpandRuntimeServices

public final class ExpandRuntimeServices
extends CompilerPhase

As part of the expansion of HIR into LIR, this compile phase replaces all HIR operators that are implemented as calls to VM service routines with CALLs to those routines. For some (common and performance critical) operators, we may optionally inline expand the call (depending on the the values of the relevant compiler options and/or Controls). This pass is also responsible for inserting write barriers if we are using an allocator that requires them. Write barriers are always inline expanded.

_os

private Simple _os

Cache of simple optimizations if used to tidy up

branchOpts

private BranchOptimizations branchOpts

Cache of branch optimizations if used to tidy up

didSomething

private boolean didSomething

Did we expand something?

constructor

private static final Constructor<CompilerPhase> constructor

Constructor for this compiler phase

ExpandRuntimeServices

public ExpandRuntimeServices()

getClassConstructor

public Constructor<CompilerPhase> getClassConstructor()

Get a constructor object for this compiler phase

Overrides:

getClassConstructor in class CompilerPhase

Returns:

compiler phase constructor

shouldPerform

public 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 String getName()

Specified by:

getName in class CompilerPhase

Returns:

a String which is the name of the phase.

reportAdditionalStats

public void reportAdditionalStats()

Description copied from class: CompilerPhase

Called when printing a measure compilation report to enable a phase to report additional phase-specific statistics.

Overrides:

reportAdditionalStats in class CompilerPhase

perform

public void perform(IR ir)

Given an HIR, expand operators that are implemented as calls to runtime service methods. This method should be called as one of the first steps in lowering HIR into LIR.

Specified by:

perform in class CompilerPhase

Parameters:

ir - The HIR to expand

inline

private void inline(Instruction inst,
                    IR ir)

Inline a call instruction

inline

private void inline(Instruction inst,
                    IR ir,
                    boolean noCalleeExceptions)

Inline a call instruction

primitiveArrayStoreHelper

private void primitiveArrayStoreHelper(RVMMethod target,
                                       Instruction inst,
                                       Instruction next,
                                       IR ir)

Helper method to generate call to primitive arrayStore write barrier

Parameters:

target - entry point for write barrier method

inst - the current instruction

next - the next instruction

ir - the IR

primitiveObjectFieldStoreHelper

private void primitiveObjectFieldStoreHelper(RVMMethod target,
                                             Instruction inst,
                                             Instruction next,
                                             IR ir,
                                             FieldReference fieldRef)

Helper method to generate call to primitive putfield write barrier

Parameters:

target - entry point for write barrier method

inst - the current instruction

next - the next instruction

ir - the IR