org.jikesrvm.compilers.opt.runtimesupport.ia32

Class OptGCMapIterator

java.lang.Object

org.jikesrvm.mm.mminterface.GCMapIterator

org.jikesrvm.compilers.opt.runtimesupport.OptGenericGCMapIterator

org.jikesrvm.compilers.opt.runtimesupport.ia32.OptGCMapIterator

public final class OptGCMapIterator
extends OptGenericGCMapIterator

An instance of this class provides iteration across the references represented by a frame built by the OPT compiler.

The architecture-specific version of the GC Map iterator. It inherits its architecture-independent code from OptGenericGCMapIterator. This version is for IA32.

Field Summary

Fields

Modifier and Type	Field and Description
private static boolean	DEBUG
(package private) static int	SAVE_VOL_SIZE
(package private) static int	VOL_SIZE

Fields inherited from class org.jikesrvm.compilers.opt.runtimesupport.OptGenericGCMapIterator

compiledMethod

Fields inherited from class org.jikesrvm.mm.mminterface.GCMapIterator

framePtr, registerLocations, thread

Constructor Summary

Constructors

Constructor and Description
OptGCMapIterator(AddressArray registerLocations)

Method Summary

Modifier and Type	Method and Description
Address	getFirstSpillLoc() Get address of the first spill location for the given frame ptr
Address	getLastSpillLoc() Get address of the last spill location for the given frame ptr
Address	getStackLocation(Address framePtr, int offset) Determine the stack location given the frame ptr and spill offset.
protected void	updateLocateRegisters() If any non-volatile GPRs were saved by the method being processed then update the registerLocations array with the locations where the registers were saved.

Methods inherited from class org.jikesrvm.compilers.opt.runtimesupport.OptGenericGCMapIterator

cleanupPointers, currentRegisterIsValid, getCurrentRegister, getNextReferenceAddress, getNextReturnAddressAddress, getType, reset, setupIterator, updateCurrentRegister

Methods inherited from class org.jikesrvm.mm.mminterface.GCMapIterator

newStackWalk

Methods inherited from class java.lang.Object

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

Field Detail

DEBUG

private static final boolean DEBUG

See Also:

Constant Field Values

VOL_SIZE

static final int VOL_SIZE

SAVE_VOL_SIZE

static final int SAVE_VOL_SIZE

Constructor Detail

OptGCMapIterator

public OptGCMapIterator(AddressArray registerLocations)

Method Detail

updateLocateRegisters

protected void updateLocateRegisters()

If any non-volatile GPRs were saved by the method being processed then update the registerLocations array with the locations where the registers were saved. Also, check for special methods that also save the volatile GPRs.

Specified by:

updateLocateRegisters in class OptGenericGCMapIterator

getStackLocation

public Address getStackLocation(Address framePtr,
                                int offset)

Description copied from class: OptGenericGCMapIterator

Determine the stack location given the frame ptr and spill offset. (The offset direction varies among architectures.)

Specified by:

getStackLocation in class OptGenericGCMapIterator

Parameters:

framePtr - the frame pointer

offset - the offset

Returns:

the resulting stack location

getFirstSpillLoc

public Address getFirstSpillLoc()

Get address of the first spill location for the given frame ptr

Specified by:

getFirstSpillLoc in class OptGenericGCMapIterator

Returns:

the first spill location

getLastSpillLoc

public Address getLastSpillLoc()

Get address of the last spill location for the given frame ptr

Specified by:

getLastSpillLoc in class OptGenericGCMapIterator

Returns:

the last spill location