com.oracle.graal.hotspot

Class HotSpotLockStack

java.lang.Object

com.oracle.graal.lir.LIRInstruction

com.oracle.graal.hotspot.HotSpotLockStack

public class HotSpotLockStack
extends LIRInstruction

Manages allocation and re-use of lock slots in a scoped manner. The slots are used in HotSpot's lightweight locking mechanism to store the mark word of an object being locked.

Nested Class Summary

Nested classes/interfaces inherited from class com.oracle.graal.lir.LIRInstruction

LIRInstruction.Alive, LIRInstruction.Def, LIRInstruction.OperandFlag, LIRInstruction.OperandMode, LIRInstruction.State, LIRInstruction.Temp, LIRInstruction.Use

Field Summary

Fields

Modifier and Type	Field and Description
private static StackSlotValue[]	EMPTY
private FrameMapBuilder	frameMapBuilder
private StackSlotValue[]	locks
private LIRKind	slotKind
static LIRInstructionClass<HotSpotLockStack>	TYPE

Fields inherited from class com.oracle.graal.lir.LIRInstruction

ADDRESS_FLAGS, ALLOWED_FLAGS

Constructor Summary

Constructors

Constructor and Description
HotSpotLockStack(FrameMapBuilder frameMapBuilder, LIRKind slotKind)

Method Summary

Modifier and Type	Method and Description
void	emitCode(CompilationResultBuilder crb)
StackSlotValue	makeLockSlot(int lockDepth) Gets a stack slot for a lock at a given lock nesting depth, allocating it first if necessary.

Methods inherited from class com.oracle.graal.lir.LIRInstruction

destroysCallerSavedRegisters, forEachAlive, forEachAlive, forEachInput, forEachInput, forEachOutput, forEachOutput, forEachRegisterHint, forEachRegisterHint, forEachState, forEachState, forEachState, forEachState, forEachTemp, forEachTemp, getLIRInstructionClass, hasOperands, hasState, id, name, setId, toString, toStringWithIdPrefix, verify, visitEachAlive, visitEachAlive, visitEachInput, visitEachInput, visitEachOutput, visitEachOutput, visitEachState, visitEachState, visitEachTemp, visitEachTemp

Methods inherited from class java.lang.Object

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

Field Detail

TYPE

public static final LIRInstructionClass<HotSpotLockStack> TYPE

EMPTY

private static final StackSlotValue[] EMPTY

locks

private StackSlotValue[] locks

frameMapBuilder

private final FrameMapBuilder frameMapBuilder

slotKind

private final LIRKind slotKind

Constructor Detail

HotSpotLockStack

public HotSpotLockStack(FrameMapBuilder frameMapBuilder,
                        LIRKind slotKind)

Method Detail

makeLockSlot

public StackSlotValue makeLockSlot(int lockDepth)

Gets a stack slot for a lock at a given lock nesting depth, allocating it first if necessary.

emitCode

public void emitCode(CompilationResultBuilder crb)

Specified by:

emitCode in class LIRInstruction