com.ibm.wala.shrikeBT

Class ShiftInstruction

java.lang.Object

com.ibm.wala.shrikeBT.Instruction

com.ibm.wala.shrikeBT.ShiftInstruction

All Implemented Interfaces:

Constants, IInstruction, IShiftInstruction, Cloneable

public final class ShiftInstruction
extends Instruction
implements IShiftInstruction

ShiftInstructions are distinguished from BinaryOpInstructions because most binary operations in the JVM require both parameters to be the same type, but shifts always take one int parameter.

Nested Class Summary

Nested classes/interfaces inherited from interface com.ibm.wala.shrikeBT.IShiftInstruction

IShiftInstruction.Operator

Nested classes/interfaces inherited from interface com.ibm.wala.shrikeBT.IInstruction

IInstruction.Visitor

Field Summary

Fields inherited from class com.ibm.wala.shrikeBT.Instruction

noInstructions

Fields inherited from interface com.ibm.wala.shrikeBT.Constants

ACC_ABSTRACT, 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, CONSTANT_Class, CONSTANT_Double, CONSTANT_FieldRef, CONSTANT_Float, CONSTANT_Integer, CONSTANT_InterfaceMethodRef, CONSTANT_InvokeDynamic, CONSTANT_Long, CONSTANT_MethodHandle, CONSTANT_MethodRef, CONSTANT_MethodType, CONSTANT_NameAndType, CONSTANT_String, CONSTANT_Utf8, indexedTypes, indexedTypes_T, MAYBE, NO, OP_aaload, OP_aastore, OP_aconst_null, OP_aload, OP_aload_0, OP_aload_1, OP_aload_2, OP_aload_3, OP_anewarray, OP_areturn, OP_arraylength, OP_astore, OP_astore_0, OP_astore_1, OP_astore_2, OP_astore_3, OP_athrow, OP_baload, OP_bastore, OP_bipush, OP_caload, OP_castore, OP_checkcast, OP_d2f, OP_d2i, OP_d2l, OP_dadd, OP_daload, OP_dastore, OP_dcmpg, OP_dcmpl, OP_dconst_0, OP_dconst_1, OP_ddiv, OP_dload, OP_dload_0, OP_dload_1, OP_dload_2, OP_dload_3, OP_dmul, OP_dneg, OP_drem, OP_dreturn, OP_dstore, OP_dstore_0, OP_dstore_1, OP_dstore_2, OP_dstore_3, OP_dsub, OP_dup, OP_dup_x1, OP_dup_x2, OP_dup2, OP_dup2_x1, OP_dup2_x2, OP_f2d, OP_f2i, OP_f2l, OP_fadd, OP_faload, OP_fastore, OP_fcmpg, OP_fcmpl, OP_fconst_0, OP_fconst_1, OP_fconst_2, OP_fdiv, OP_fload, OP_fload_0, OP_fload_1, OP_fload_2, OP_fload_3, OP_fmul, OP_fneg, OP_frem, OP_freturn, OP_fstore, OP_fstore_0, OP_fstore_1, OP_fstore_2, OP_fstore_3, OP_fsub, OP_getfield, OP_getstatic, OP_goto, OP_goto_w, OP_i2b, OP_i2c, OP_i2d, OP_i2f, OP_i2l, OP_i2s, OP_iadd, OP_iaload, OP_iand, OP_iastore, OP_iconst_0, OP_iconst_1, OP_iconst_2, OP_iconst_3, OP_iconst_4, OP_iconst_5, OP_iconst_m1, OP_idiv, OP_if_acmpeq, OP_if_acmpne, OP_if_icmpeq, OP_if_icmpge, OP_if_icmpgt, OP_if_icmple, OP_if_icmplt, OP_if_icmpne, OP_ifeq, OP_ifge, OP_ifgt, OP_ifle, OP_iflt, OP_ifne, OP_ifnonnull, OP_ifnull, OP_iinc, OP_iload, OP_iload_0, OP_iload_1, OP_iload_2, OP_iload_3, OP_imul, OP_ineg, OP_instanceof, OP_invokedynamic, OP_invokeinterface, OP_invokespecial, OP_invokestatic, OP_invokevirtual, OP_ior, OP_irem, OP_ireturn, OP_ishl, OP_ishr, OP_istore, OP_istore_0, OP_istore_1, OP_istore_2, OP_istore_3, OP_isub, OP_iushr, OP_ixor, OP_jsr, OP_jsr_w, OP_l2d, OP_l2f, OP_l2i, OP_ladd, OP_laload, OP_land, OP_lastore, OP_lcmp, OP_lconst_0, OP_lconst_1, OP_ldc, OP_ldc_w, OP_ldc2_w, OP_ldiv, OP_lload, OP_lload_0, OP_lload_1, OP_lload_2, OP_lload_3, OP_lmul, OP_lneg, OP_lookupswitch, OP_lor, OP_lrem, OP_lreturn, OP_lshl, OP_lshr, OP_lstore, OP_lstore_0, OP_lstore_1, OP_lstore_2, OP_lstore_3, OP_lsub, OP_lushr, OP_lxor, OP_monitorenter, OP_monitorexit, OP_multianewarray, OP_new, OP_newarray, OP_nop, OP_pop, OP_pop2, OP_putfield, OP_putstatic, OP_ret, OP_return, OP_saload, OP_sastore, OP_sipush, OP_swap, OP_tableswitch, OP_wide, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TYPE_boolean, TYPE_boolean_index, TYPE_byte, TYPE_byte_index, TYPE_char, TYPE_char_index, TYPE_Class, TYPE_double, TYPE_double_index, TYPE_Error, TYPE_Exception, TYPE_float, TYPE_float_index, TYPE_int, TYPE_int_index, TYPE_long, TYPE_long_index, TYPE_MethodHandle, TYPE_MethodType, TYPE_null, TYPE_Object, TYPE_Object_index, TYPE_RuntimeException, TYPE_short, TYPE_short_index, TYPE_String, TYPE_Throwable, TYPE_unknown, TYPE_void, YES

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ShiftInstruction(short opcode)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
IShiftInstruction.Operator	getOperator()
int	getPoppedCount()
String	getPushedType(String[] types) Computes the type of data pushed onto the stack, or null if none is pushed.
byte	getPushedWordSize()
String	getType()
int	hashCode()
boolean	isPEI() PEI == "Potentially excepting instruction"
boolean	isUnsigned()
static ShiftInstruction	make(String type, IShiftInstruction.Operator operator)
String	toString() Subclasses must implement toString.
void	visit(IInstruction.Visitor v) Apply a Visitor to this instruction.

Methods inherited from class com.ibm.wala.shrikeBT.Instruction

clone, getBranchTargets, getOpcode, isFallThrough, redirectTargets

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.ibm.wala.shrikeBT.IInstruction

getBranchTargets, isFallThrough, redirectTargets

Constructor Detail

ShiftInstruction

protected ShiftInstruction(short opcode)

Method Detail

make

public static ShiftInstruction make(String type,
                                    IShiftInstruction.Operator operator)
                             throws IllegalArgumentException

Throws:

IllegalArgumentException

equals

public boolean equals(Object o)

Overrides:

equals in class Object

getOperator

public IShiftInstruction.Operator getOperator()

Specified by:

getOperator in interface IShiftInstruction

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getPoppedCount

public int getPoppedCount()

Specified by:

getPoppedCount in interface IInstruction

Overrides:

getPoppedCount in class Instruction

Returns:

the number of values this instruction pops off the working stack

getPushedType

public String getPushedType(String[] types)

Description copied from class: Instruction

Computes the type of data pushed onto the stack, or null if none is pushed.

Specified by:

getPushedType in interface IInstruction

Overrides:

getPushedType in class Instruction

Parameters:

types - the types of the data popped off the stack by this instruction; if poppedTypes is null, then we don't know the incoming stack types and the result of this method may be less accurate

getPushedWordSize

public byte getPushedWordSize()

Specified by:

getPushedWordSize in interface IInstruction

Overrides:

getPushedWordSize in class Instruction

Returns:

the JVM word size of the value this instruction pushes onto the stack, or 0 if this instruction doesn't push anything onto the stack.

getType

public String getType()

Specified by:

getType in interface IShiftInstruction

visit

public void visit(IInstruction.Visitor v)
           throws NullPointerException

Description copied from class: Instruction

Apply a Visitor to this instruction. We invoke the appropriate Visitor method according to the type of this instruction.

Specified by:

visit in interface IInstruction

Specified by:

visit in class Instruction

Throws:

NullPointerException

toString

public String toString()

Description copied from class: Instruction

Subclasses must implement toString.

Specified by:

toString in interface IInstruction

Specified by:

toString in class Instruction

isPEI

public boolean isPEI()

Description copied from interface: IInstruction

PEI == "Potentially excepting instruction"

Specified by:

isPEI in interface IInstruction

Returns:

true iff this instruction might throw an exception

isUnsigned

public boolean isUnsigned()

Specified by:

isUnsigned in interface IShiftInstruction