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com.techtrader.modules.tools.bytecode
Class ConstantInstruction  

java.lang.Object
  com.techtrader.modules.tools.bytecode.Instruction
      com.techtrader.modules.tools.bytecode.ConstantInstruction

All Implemented Interfaces:

Constants, com.techtrader.modules.tools.bytecode.visitor.VisitAcceptor

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public class ConstantInstruction

extends Instruction

Represents an instruction that that loads a constant onto the stack. The opcode represented by this Instruction may change depending on the type and value of the constant set. For example, if the constant value is initially set to '5', the opcode will be iconst_5; if later incremented to '6', the opcode will be changed to bipush(6).

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Field Summary
private  int	_arg
private  java.lang.Object	_value

 

Fields inherited from class com.techtrader.modules.tools.bytecode.Instruction

_byteIndex, _opcode, _opcodeTypes, _owner

 

Fields inherited from interface com.techtrader.modules.tools.bytecode.Constants

AALOAD, AASTORE, ACCESS_ABSTRACT, ACCESS_FINAL, ACCESS_INTERFACE, ACCESS_NATIVE, ACCESS_PRIVATE, ACCESS_PROTECTED, ACCESS_PUBLIC, ACCESS_STATIC, ACCESS_STRICT, ACCESS_SUPER, ACCESS_SYNCHRONIZED, ACCESS_TRANSIENT, ACCESS_VOLATILE, ACONST_NULL, ALOAD, ALOAD_0, ALOAD_1, ALOAD_2, ALOAD_3, ANEWARRAY, ARETURN, ARRAY_BOOLEAN, ARRAY_BYTE, ARRAY_CHAR, ARRAY_DOUBLE, ARRAY_FLOAT, ARRAY_INT, ARRAY_LONG, ARRAY_SHORT, ARRAYLENGTH, ASTORE, ASTORE_0, ASTORE_1, ASTORE_2, ASTORE_3, ATHROW, ATTR_CODE, ATTR_CONST, ATTR_DEPRECATED, ATTR_EXCEPTIONS, ATTR_INNERCLASS, ATTR_LINENUMBERS, ATTR_LOCALS, ATTR_SOURCE, ATTR_SYNTHETIC, ATTR_UNKNOWN, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DLOAD_0, DLOAD_1, DLOAD_2, DLOAD_3, DMUL, DNEG, DREM, DRETURN, DSTORE, DSTORE_0, DSTORE_1, DSTORE_2, DSTORE_3, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAD_0, FLOAD_1, FLOAD_2, FLOAD_3, FMUL, FNEG, FREM, FRETURN, FSTORE, FSTORE_0, FSTORE_1, FSTORE_2, FSTORE_3, FSUB, GETFIELD, GETSTATIC, GOTO, GOTO_W, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_EQ, IF_GE, IF_GT, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IF_LE, IF_LT, IF_NE, IF_NONNULL, IF_NULL, IINC, ILOAD, ILOAD_0, ILOAD_1, ILOAD_2, ILOAD_3, IMUL, INEG, INSTANCEOF, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISTORE_0, ISTORE_1, ISTORE_2, ISTORE_3, ISUB, IUSHR, IXOR, JSR, JSR_W, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDC_W, LDC2_W, LDIV, LLOAD, LLOAD_0, LLOAD_1, LLOAD_2, LLOAD_3, LMUL, LNEG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSTORE_0, LSTORE_1, LSTORE_2, LSTORE_3, LSUB, LUSHR, LXOR, MATH_ADD, MATH_AND, MATH_DIV, MATH_MUL, MATH_NEG, MATH_OR, MATH_REM, MATH_SHL, MATH_SHR, MATH_SUB, MATH_USHR, MATH_XOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, OPCODE_NAMES, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SWAP, TABLESWITCH, VALID_MAGIC, WIDE

 

Constructor Summary
protected	ConstantInstruction(Code owner)
protected	ConstantInstruction(Code owner, int opcode, java.lang.Object value)

 

Method Summary
void	acceptVisit(com.techtrader.modules.tools.bytecode.visitor.BCVisitor visit)           Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this object.
private  void	calculateOpCode()           Helper method to calculate the optimal opcode for the constant to be pushed onto the stack.
protected  void	copy(Instruction orig)
boolean	equals(java.lang.Object other)           ConstantInstructions are equal if the const they reference is the same, or if the const of either is unset.
java.lang.Object	getConstant()           Return the constant value as an Object; will be an instance of String, Integer, Float, Double, or Long, as necessary.
java.lang.Class	getConstantType()           Return the class of constant this instruction references.
java.lang.String	getConstantTypeName()           Return the class of constant this instruction references.
double	getDoubleConstant()           Get the constant to double, for float constants; must be a ldc2 instruction.
float	getFloatConstant()           Get the constant to load, for float constants.
int	getIntConstant()           Get the constant to load, for int constants.
int	getLength()           Return the length in bytes of this opcode, including all arguments.
long	getLongConstant()           Get the constant to load, for float constants; must be a ldc2 instruction.
int	getStackChange()           Return the number of stack positions this instruction pushes or pops during its execution.
java.lang.String	getStringConstant()           Get the constant to load, for String constants.
protected  void	readData(java.io.DataInput in)           Read the arguments for this opcode from the given stream.
ConstantInstruction	setConstant(java.lang.Object value)           Set the constant to the given Object value.
ConstantInstruction	setDoubleConstant(double value)           Set the constant to load, for double constants; must be a ldc2 instruction.
ConstantInstruction	setFloatConstant(float value)           Set the constant to load, for float constants.
ConstantInstruction	setIntConstant(int value)           Set the constant to load, for int constants.
ConstantInstruction	setLongConstant(long value)           Set the constant to load, for long constants; must be a ldc2 instruction.
ConstantInstruction	setStringConstant(java.lang.String value)           Set the constant to load, for String constants.
protected  void	writeData(java.io.DataOutput out)           Write the arguments for this opcode to the given stream.

 

Methods inherited from class com.techtrader.modules.tools.bytecode.Instruction

getByteIndex, getName, getOpCode, getOwner, invalidate, setByteIndex, setOpCode

 

Methods inherited from class java.lang.Object

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

 

Field Detail

_value

private java.lang.Object _value

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_arg

private int _arg

Constructor Detail

ConstantInstruction

protected ConstantInstruction(Code owner)

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ConstantInstruction

protected ConstantInstruction(Code owner,
                              int opcode,
                              java.lang.Object value)

Method Detail

setConstant

public ConstantInstruction setConstant(java.lang.Object value)

Set the constant to the given Object value. The Object should be an instance of String, Integer, Long, Double, or Float depending on the constant type.

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getConstant

public java.lang.Object getConstant()

Return the constant value as an Object; will be an instance of String, Integer, Float, Double, or Long, as necessary. Returns null if the constant has not been set, or if this represents the aconst_null opcode.

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getConstantType

public java.lang.Class getConstantType()

Return the class of constant this instruction references. Will return one of: Object.class, String.class, int.class, long.class, double.class, float.class.

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getConstantTypeName

public java.lang.String getConstantTypeName()

Return the class of constant this instruction references. Will return one of: java.lang.Object, java.lang.String, int, long, double, float.

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setStringConstant

public ConstantInstruction setStringConstant(java.lang.String value)

Set the constant to load, for String constants.

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getStringConstant

public java.lang.String getStringConstant()

Get the constant to load, for String constants.

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setIntConstant

public ConstantInstruction setIntConstant(int value)

Set the constant to load, for int constants.

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getIntConstant

public int getIntConstant()

Get the constant to load, for int constants.

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setFloatConstant

public ConstantInstruction setFloatConstant(float value)

Set the constant to load, for float constants.

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getFloatConstant

public float getFloatConstant()

Get the constant to load, for float constants.

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setLongConstant

public ConstantInstruction setLongConstant(long value)

Set the constant to load, for long constants; must be a ldc2 instruction.

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getLongConstant

public long getLongConstant()

Get the constant to load, for float constants; must be a ldc2 instruction.

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setDoubleConstant

public ConstantInstruction setDoubleConstant(double value)

Set the constant to load, for double constants; must be a ldc2 instruction.

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getDoubleConstant

public double getDoubleConstant()

Get the constant to double, for float constants; must be a ldc2 instruction.

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equals

public boolean equals(java.lang.Object other)

ConstantInstructions are equal if the const they reference is the same, or if the const of either is unset.

Overrides:

equals in class Instruction

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getLength

public int getLength()

Description copied from class: Instruction

Return the length in bytes of this opcode, including all arguments. This method should be overridden by opcodes that take arguments.

Overrides:

getLength in class Instruction

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getStackChange

public int getStackChange()

Description copied from class: Instruction

Return the number of stack positions this instruction pushes or pops during its execution.

Overrides:

getStackChange in class Instruction

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copy

protected void copy(Instruction orig)

Overrides:

copy in class Instruction

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readData

protected void readData(java.io.DataInput in)
                 throws java.io.IOException

Description copied from class: Instruction

Read the arguments for this opcode from the given stream. This method should be overridden by opcodes that take arguments.

Overrides:

readData in class Instruction

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writeData

protected void writeData(java.io.DataOutput out)
                  throws java.io.IOException

Description copied from class: Instruction

Write the arguments for this opcode to the given stream. This method should be overridden by opcodes that take arguments.

Overrides:

writeData in class Instruction

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calculateOpCode

private void calculateOpCode()

Helper method to calculate the optimal opcode for the constant to be pushed onto the stack.

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acceptVisit

public void acceptVisit(com.techtrader.modules.tools.bytecode.visitor.BCVisitor visit)

Description copied from interface: com.techtrader.modules.tools.bytecode.visitor.VisitAcceptor

Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this object.

Specified by:

acceptVisit in interface com.techtrader.modules.tools.bytecode.visitor.VisitAcceptor

Overrides:

acceptVisit in class Instruction

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> techtrader >> modules >> tools >> [ bytecode overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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