org.multijava.util.classfile
Class JumpInstruction

java.lang.Object
  org.multijava.util.classfile.AbstractInstructionAccessor
      org.multijava.util.classfile.Instruction
          org.multijava.util.classfile.JumpInstruction

All Implemented Interfaces:

AccessorContainer, Constants, InstructionAccessor

public class JumpInstruction

extends Instruction

implements AccessorContainer

This class represents instructions that take a label as argument.

Field Summary
private  InstructionAccessor	target
private  boolean	wide

 

Fields inherited from class org.multijava.util.classfile.Instruction

 

Fields inherited from interface org.multijava.util.classfile.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, ACCESS_FLAG_ARRAY, ACCESS_FLAG_NAMES, ATT_ANCHOR, ATT_BRIDGE, ATT_CODE, ATT_CONSTANTVALUE, ATT_DEPRECATED, ATT_DISPATCHER, ATT_EXCEPTIONS, ATT_GENERIC, ATT_GENERIC_FUNCTIONS, ATT_INNERCLASSES, ATT_LINENUMBERTABLE, ATT_LOCALVARIABLETABLE, ATT_MM_BODY, ATT_REDIRECTOR, ATT_RMJ_GLUE, ATT_RMJ_SIGNATURE, ATT_RUNTIME_VISIBLE_ANNOTATIONS, ATT_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS, ATT_SIGNATURE, ATT_SOURCEFILE, ATT_SYNTHETIC, ATT_UNIVERSE_FIELD, ATT_UNIVERSE_METHOD, ATT_UNIVERSE_VERSION, CST_CLASS, CST_DOUBLE, CST_FIELD, CST_FLOAT, CST_INTEGER, CST_INTERFACEMETHOD, CST_LONG, CST_METHOD, CST_NAMEANDTYPE, CST_STRING, CST_UTF8, ENV_DEBUG_MODE, ENV_USE_CACHE, JAVA_MAGIC, JAVA_MAJOR, JAVA_MINOR, MAX_CODE_PER_METHOD, opc_aaload, opc_aastore, opc_aconst_null, opc_aload, opc_aload_0, opc_aload_1, opc_aload_2, opc_aload_3, opc_anewarray, opc_areturn, opc_arraylength, opc_astore, opc_astore_0, opc_astore_1, opc_astore_2, opc_astore_3, opc_athrow, opc_baload, opc_bastore, opc_bipush, opc_caload, opc_castore, opc_checkcast, opc_d2f, opc_d2i, opc_d2l, opc_dadd, opc_daload, opc_dastore, opc_dcmpg, opc_dcmpl, opc_dconst_0, opc_dconst_1, opc_ddiv, opc_dload, opc_dload_0, opc_dload_1, opc_dload_2, opc_dload_3, opc_dmul, opc_dneg, opc_drem, opc_dreturn, opc_dstore, opc_dstore_0, opc_dstore_1, opc_dstore_2, opc_dstore_3, opc_dsub, opc_dup, opc_dup2, opc_dup2_x1, opc_dup2_x2, opc_dup_x1, opc_dup_x2, opc_f2d, opc_f2i, opc_f2l, opc_fadd, opc_faload, opc_fastore, opc_fcmpg, opc_fcmpl, opc_fconst_0, opc_fconst_1, opc_fconst_2, opc_fdiv, opc_fload, opc_fload_0, opc_fload_1, opc_fload_2, opc_fload_3, opc_fmul, opc_fneg, opc_frem, opc_freturn, opc_fstore, opc_fstore_0, opc_fstore_1, opc_fstore_2, opc_fstore_3, opc_fsub, opc_getfield, opc_getstatic, opc_goto, opc_goto_w, opc_i2b, opc_i2c, opc_i2d, opc_i2f, opc_i2l, opc_i2s, opc_iadd, opc_iaload, opc_iand, opc_iastore, opc_iconst_0, opc_iconst_1, opc_iconst_2, opc_iconst_3, opc_iconst_4, opc_iconst_5, opc_iconst_m1, opc_idiv, opc_if_acmpeq, opc_if_acmpne, opc_if_icmpeq, opc_if_icmpge, opc_if_icmpgt, opc_if_icmple, opc_if_icmplt, opc_if_icmpne, opc_ifeq, opc_ifge, opc_ifgt, opc_ifle, opc_iflt, opc_ifne, opc_ifnonnull, opc_ifnull, opc_iinc, opc_iload, opc_iload_0, opc_iload_1, opc_iload_2, opc_iload_3, opc_imul, opc_ineg, opc_instanceof, opc_invokeinterface, opc_invokespecial, opc_invokestatic, opc_invokevirtual, opc_ior, opc_irem, opc_ireturn, opc_ishl, opc_ishr, opc_istore, opc_istore_0, opc_istore_1, opc_istore_2, opc_istore_3, opc_isub, opc_iushr, opc_ixor, opc_jsr, opc_jsr_w, opc_l2d, opc_l2f, opc_l2i, opc_ladd, opc_laload, opc_land, opc_lastore, opc_lcmp, opc_lconst_0, opc_lconst_1, opc_ldc, opc_ldc2_w, opc_ldc_w, opc_ldiv, opc_lload, opc_lload_0, opc_lload_1, opc_lload_2, opc_lload_3, opc_lmul, opc_lneg, opc_lookupswitch, opc_lor, opc_lrem, opc_lreturn, opc_lshl, opc_lshr, opc_lstore, opc_lstore_0, opc_lstore_1, opc_lstore_2, opc_lstore_3, opc_lsub, opc_lushr, opc_lxor, opc_monitorenter, opc_monitorexit, opc_multianewarray, opc_new, opc_newarray, opc_nop, opc_pop, opc_pop2, opc_putfield, opc_putstatic, opc_ret, opc_return, opc_saload, opc_sastore, opc_sipush, opc_swap, opc_tableswitch, opc_wide, opc_xxxunusedxxx, POO_ASCII_CONSTANT, POO_CLASS_CONSTANT, POO_DOUBLE_CONSTANT, POO_FLOAT_CONSTANT, POO_INTEGER_CONSTANT, POO_LONG_CONSTANT, POO_NAT_CONSTANT, POO_REF_CONSTANT, POO_STRING_CONSTANT, TYP_ADDRESS, TYP_DOUBLE, TYP_FLOAT, TYP_INT, TYP_LONG, TYP_REFERENCE, TYP_VOID

 

Constructor Summary

JumpInstruction(int opcode, InstructionAccessor target)           Constructs a new instruction that takes a label as argument.

 

Method Summary
boolean	canComplete()           Returns true iff control flow can reach the next instruction in textual order.
(package private)  void	check(CodeEnv env, int curStack)           Verifies the enclosed instruction and computes the stack height.
(package private)  void	computeEndAddress(CodePosition position)           Computes the address of the end of the instruction.
void	dump()
int	getPushedOnStack()           Returns the size of data pushed on the stack by this instruction
byte	getReturnType()           Returns the type pushed on the stack
(package private)  int	getSize()           Returns the number of bytes used by the the instruction in the code array.
int	getStack()           Return the amount of stack (positive or negative) used by this instruction
InstructionAccessor	getTarget()           Return the target of this instruction
(package private)  void	resolveConstants(ConstantPool cp)           Insert or check location of constant value on constant pool
void	setTarget(InstructionAccessor target)           Sets the target for this instruction
void	transformAccessors(AccessorTransformer transformer)           Transforms targets (deferences to actual instructions).
(package private)  void	write(ConstantPool cp, DataOutput out)           Write this instruction into a file

 

Methods inherited from class org.multijava.util.classfile.Instruction

getAddress, getLocalVar, getOpcode, getPoppedFromStack, isLiteral, setAddress, setOpcode

 

Methods inherited from class org.multijava.util.classfile.AbstractInstructionAccessor

transform

 

Methods inherited from class java.lang.Object

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

 

Field Detail

target

private InstructionAccessor target

wide

private boolean wide

JumpInstruction

public JumpInstruction(int opcode,
                       InstructionAccessor target)

Constructs a new instruction that takes a label as argument.

Parameters:

opcode - the opcode of the instruction

target - the referenced instruction

canComplete

public boolean canComplete()

Returns true iff control flow can reach the next instruction in textual order.

transformAccessors

public void transformAccessors(AccessorTransformer transformer)
                        throws BadAccessorException

Transforms targets (deferences to actual instructions).

Specified by:

transformAccessors in interface AccessorContainer

Parameters:

transformer - the transformer used to transform accessors

Throws:

BadAccessorException

setTarget

public void setTarget(InstructionAccessor target)

Sets the target for this instruction

getTarget

public InstructionAccessor getTarget()

Return the target of this instruction

getSize

int getSize()

Returns the number of bytes used by the the instruction in the code array.

check

void check(CodeEnv env,
           int curStack)
     throws ClassFileFormatException

Verifies the enclosed instruction and computes the stack height.

Overrides:

check in class Instruction

Parameters:

env - the check environment

curStack - the stack height at the end of the execution of the instruction

Returns:

true iff the next instruction in textual order needs to be checked, i.e. this instruction has not been checked before and it can complete normally

Throws:

ClassFileFormatException - a problem was detected

computeEndAddress

void computeEndAddress(CodePosition position)

Computes the address of the end of the instruction.

Overrides:

computeEndAddress in class Instruction

Parameters:

position - the minimum and maximum address of the begin of this instruction. This parameter is changed to the minimum and maximum address of the end of this instruction.

getPushedOnStack

public int getPushedOnStack()

Returns the size of data pushed on the stack by this instruction

getReturnType

public byte getReturnType()

Returns the type pushed on the stack

getStack

public int getStack()

Return the amount of stack (positive or negative) used by this instruction

resolveConstants

void resolveConstants(ConstantPool cp)

Insert or check location of constant value on constant pool

Parameters:

cp - the constant pool for this class

write

void write(ConstantPool cp,
           DataOutput out)
     throws IOException

Write this instruction into a file

Parameters:

cp - the constant pool that contain all data

out - the file where to write this object info

Throws:

IOException - an io problem has occured

dump

public void dump()

Overrides:

dump in class Instruction