org.multijava.util.classfile
Class LocalVarInstruction

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

All Implemented Interfaces:

Constants, InstructionAccessor

public class LocalVarInstruction

extends Instruction

This class represents instructions that take a local variable as argument. Shortcuts (single byte instructions) are created for the opcodes: iload, fload, aload, lload, dload, istore, fstore, astore, lstore, dstore if the variable index is 0, 1, 2 or 3. An extra wide prefix is automatically added for these instructions if the numeric argument is larger than 255.

Field Summary
private  int	index
static byte	KND_LOAD
static byte	KND_RET
static byte	KND_STORE
private  int	width

 

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

LocalVarInstruction(int opcode, int index)           Constructs a new instruction that takes a local variable as argument.

 

Method Summary
boolean	canComplete()           Returns true iff control flow can reach the next instruction in textual order.
int	getIndex()           Returns the position of the variable in the local var set
(package private)  int	getLocalVar()           Returns the maximum index of local vars used by this instruction.
byte	getOperandType()           Returns the type of the operand.
byte	getOperationKind()           Returns the operation kind.
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.
boolean	isLoad()
boolean	isStore()
(package private)  void	resolveConstants(ConstantPool cp)           Insert or check location of constant value on constant pool
(package private)  void	write(ConstantPool cp, DataOutput out)           Write this instruction into a file

 

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

check, computeEndAddress, dump, getAddress, 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

KND_LOAD

public static final byte KND_LOAD

KND_STORE

public static final byte KND_STORE

KND_RET

public static final byte KND_RET

index

private int index

width

private int width

LocalVarInstruction

public LocalVarInstruction(int opcode,
                           int index)

Constructs a new instruction that takes a local variable as argument.

Parameters:

opcode - the opcode of the instruction

index - the index of the local variable

canComplete

public boolean canComplete()

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

getSize

int getSize()

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

getIndex

public int getIndex()

Returns the position of the variable in the local var set

getReturnType

public byte getReturnType()

Returns the type pushed on the stack

getOperandType

public byte getOperandType()

Returns the type of the operand.

getOperationKind

public byte getOperationKind()

Returns the operation kind.

getLocalVar

int getLocalVar()

Returns the maximum index of local vars used by this instruction. A variable of type

Overrides:

getLocalVar in class Instruction

isLoad

public boolean isLoad()

isStore

public boolean isStore()

getPushedOnStack

public int getPushedOnStack()

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

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