LocalRegPair (Jikes RVM API)

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org.jikesrvm.osr
Class LocalRegPair

java.lang.Object
  org.jikesrvm.osr.LocalRegPair

All Implemented Interfaces:: ClassLoaderConstants, OSRConstants, SizeConstants

public class LocalRegPair
extends Object
implements OSRConstants
extends Object
implements OSRConstants

An LocalRegPair keeps the type information and location of a local variable/stack slot from byte code to machine code.

Field Summary
`LocalRegPair`	`_otherHalf` A LONG variable takes two symbolic registers, we need to know another half part.
`boolean`	`kind` is it a local or stack?
`int`	`num` what's the number of local of stack
`Operand`	`operand` What's the register operand, from which we can get the symbolic register.
`byte`	`typeCode` what's the type code?
`Word`	`value` The meaning of value field depends on valueType: for ICONST, ACONST and LCONST, it is the value of the constant, for PHYREG, it is the register number, for SPILL, it is the spill location.
`byte`	`valueType` A reg value could be an integer constant (ICONST), a physical register (PHYREG), or a spill on the stack (SPILL).

Fields inherited from interface org.jikesrvm.osr.OSRConstants
ACONST, BCI_MASK, BCI_SHIFT, CLEANREFS, DOUBLE, FLOAT, GETREFAT, HIGH_64BIT, ICONST, IEI_MASK, IEI_SHIFT, INT, INVALID_BCI, INVALID_IEI, KIND_MASK, KIND_SHIFT, LCONST, LOCAL, LONG, NEXT_BIT, NO_OSR_ENTRY, NUM_MASK, NUM_SHIFT, OFFSET_MASK, OFFSET_SHIFT, OSRI_MASK, OSRI_SHIFT, PHYREG, PSEUDO_CheckCast, PSEUDO_InvokeCompiledMethod, PSEUDO_InvokeStatic, PSEUDO_LoadDoubleConst, PSEUDO_LoadFloatConst, PSEUDO_LoadIntConst, PSEUDO_LoadLongConst, PSEUDO_LoadRetAddrConst, PSEUDO_LoadWordConst, PSEUDO_ParamInitEnd, REF, RET_ADDR, ReturnAddressTypeCode, SPILL, STACK, TCODE_MASK, TCODE_SHIFT, VTYPE_MASK, VTYPE_SHIFT, WORD, WordTypeCode

Fields inherited from interface org.jikesrvm.osr.OSRConstants

ACONST, BCI_MASK, BCI_SHIFT, CLEANREFS, DOUBLE, FLOAT, GETREFAT, HIGH_64BIT, ICONST, IEI_MASK, IEI_SHIFT, INT, INVALID_BCI, INVALID_IEI, KIND_MASK, KIND_SHIFT, LCONST, LOCAL, LONG, NEXT_BIT, NO_OSR_ENTRY, NUM_MASK, NUM_SHIFT, OFFSET_MASK, OFFSET_SHIFT, OSRI_MASK, OSRI_SHIFT, PHYREG, PSEUDO_CheckCast, PSEUDO_InvokeCompiledMethod, PSEUDO_InvokeStatic, PSEUDO_LoadDoubleConst, PSEUDO_LoadFloatConst, PSEUDO_LoadIntConst, PSEUDO_LoadLongConst, PSEUDO_LoadRetAddrConst, PSEUDO_LoadWordConst, PSEUDO_ParamInitEnd, REF, RET_ADDR, ReturnAddressTypeCode, SPILL, STACK, TCODE_MASK, TCODE_SHIFT, VTYPE_MASK, VTYPE_SHIFT, WORD, WordTypeCode

Fields inherited from interface org.jikesrvm.SizeConstants
BITS_IN_ADDRESS, BITS_IN_BOOLEAN, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_DOUBLE, BITS_IN_EXTENT, BITS_IN_FLOAT, BITS_IN_INT, BITS_IN_LONG, BITS_IN_OFFSET, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BOOLEAN, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_DOUBLE, BYTES_IN_EXTENT, BYTES_IN_FLOAT, BYTES_IN_INT, BYTES_IN_LONG, BYTES_IN_OFFSET, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BOOLEAN, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_DOUBLE, LOG_BITS_IN_EXTENT, LOG_BITS_IN_FLOAT, LOG_BITS_IN_INT, LOG_BITS_IN_LONG, LOG_BITS_IN_OFFSET, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_BOOLEAN, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_DOUBLE, LOG_BYTES_IN_EXTENT, LOG_BYTES_IN_FLOAT, LOG_BYTES_IN_INT, LOG_BYTES_IN_LONG, LOG_BYTES_IN_OFFSET, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD

Fields inherited from interface org.jikesrvm.SizeConstants

BITS_IN_ADDRESS, BITS_IN_BOOLEAN, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_DOUBLE, BITS_IN_EXTENT, BITS_IN_FLOAT, BITS_IN_INT, BITS_IN_LONG, BITS_IN_OFFSET, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BOOLEAN, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_DOUBLE, BYTES_IN_EXTENT, BYTES_IN_FLOAT, BYTES_IN_INT, BYTES_IN_LONG, BYTES_IN_OFFSET, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BOOLEAN, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_DOUBLE, LOG_BITS_IN_EXTENT, LOG_BITS_IN_FLOAT, LOG_BITS_IN_INT, LOG_BITS_IN_LONG, LOG_BITS_IN_OFFSET, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_BOOLEAN, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_DOUBLE, LOG_BYTES_IN_EXTENT, LOG_BYTES_IN_FLOAT, LOG_BYTES_IN_INT, LOG_BYTES_IN_LONG, LOG_BYTES_IN_OFFSET, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD

Fields inherited from interface org.jikesrvm.classloader.ClassLoaderConstants
ACC_ABSTRACT, ACC_ANNOTATION, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VOLATILE, APPLICABLE_TO_CLASSES, APPLICABLE_TO_FIELDS, APPLICABLE_TO_METHODS, ArrayTypeCode, BooleanTypeCode, BRIDGE, ByteTypeCode, CharTypeCode, CLASS_INITIALIZED, CLASS_INITIALIZER_FAILED, CLASS_INITIALIZING, CLASS_INSTANTIATED, CLASS_LOADED, CLASS_RESOLVED, CLASS_VACANT, ClassTypeCode, CP_CLASS, CP_DOUBLE, CP_FLOAT, CP_INT, CP_LONG, CP_MEMBER, CP_STRING, CP_UTF, DoubleTypeCode, FloatTypeCode, IntTypeCode, LongTypeCode, ShortTypeCode, TAG_DOUBLE, TAG_FIELDREF, TAG_FLOAT, TAG_INT, TAG_INTERFACE_METHODREF, TAG_LONG, TAG_MEMBERNAME_AND_DESCRIPTOR, TAG_METHODREF, TAG_STRING, TAG_TYPEREF, TAG_UNUSED, TAG_UTF, VARARGS, VoidTypeCode

Fields inherited from interface org.jikesrvm.classloader.ClassLoaderConstants

ACC_ABSTRACT, ACC_ANNOTATION, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VOLATILE, APPLICABLE_TO_CLASSES, APPLICABLE_TO_FIELDS, APPLICABLE_TO_METHODS, ArrayTypeCode, BooleanTypeCode, BRIDGE, ByteTypeCode, CharTypeCode, CLASS_INITIALIZED, CLASS_INITIALIZER_FAILED, CLASS_INITIALIZING, CLASS_INSTANTIATED, CLASS_LOADED, CLASS_RESOLVED, CLASS_VACANT, ClassTypeCode, CP_CLASS, CP_DOUBLE, CP_FLOAT, CP_INT, CP_LONG, CP_MEMBER, CP_STRING, CP_UTF, DoubleTypeCode, FloatTypeCode, IntTypeCode, LongTypeCode, ShortTypeCode, TAG_DOUBLE, TAG_FIELDREF, TAG_FLOAT, TAG_INT, TAG_INTERFACE_METHODREF, TAG_LONG, TAG_MEMBERNAME_AND_DESCRIPTOR, TAG_METHODREF, TAG_STRING, TAG_TYPEREF, TAG_UNUSED, TAG_UTF, VARARGS, VoidTypeCode

Constructor Summary
`LocalRegPair(boolean kind, int num, byte type, Operand op)`

Method Summary
`LocalRegPair`	`copy()`
`String`	`toString()` converts tuple to string as ( L/S num, type, valueType, value, operand )

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

kind

public final boolean kind

is it a local or stack?

num

public int num

what's the number of local of stack

typeCode

public final byte typeCode

what's the type code? ('I', 'J', 'D', etc)

operand

public final Operand operand

What's the register operand, from which we can get the symbolic register. The operand could be symbolic register, or constants, we need to take it out later.

valueType

public byte valueType

A reg value could be

an integer constant (ICONST),
a physical register (PHYREG), or
a spill on the stack (SPILL).

The valueType is one of them, combined with the typeCode, one should be able to recover the value of a variable.

value

public Word value

The meaning of value field depends on valueType:

for ICONST, ACONST and LCONST, it is the value of the constant,
for PHYREG, it is the register number,
for SPILL, it is the spill location.

_otherHalf

public LocalRegPair _otherHalf

A LONG variable takes two symbolic registers, we need to know another half part.

Constructor Detail

LocalRegPair

public LocalRegPair(boolean kind,
                    int num,
                    byte type,
                    Operand op)

Method Detail

copy

public LocalRegPair copy()

toString

public String toString()

converts tuple to string as ( L/S num, type, valueType, value, operand )

Overrides:: toString in class Object