at.dms.classfile
Class SwitchInstruction

java.lang.Object
  at.dms.classfile.AbstractInstructionAccessor
      at.dms.classfile.Instruction
          at.dms.classfile.SwitchInstruction

All Implemented Interfaces:

AccessorContainer, Constants, InstructionAccessor

public class SwitchInstruction
extends Instruction
implements AccessorContainer

Some instructions are perniticky enough that its simpler to write them separately instead of smushing them with all the rest. the multiarray instruction is one of them.

Field Summary

Fields inherited from interface at.dms.classfile.Constants

ACC_ABSTRACT, ACC_FINAL, ACC_INLINE, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_TRANSIENT, ACC_VOLATILE, ATT_CODE, ATT_CONSTANTVALUE, ATT_DEPRECATED, ATT_EXCEPTIONS, ATT_GENERIC, ATT_INNERCLASSES, ATT_LINENUMBERTABLE, ATT_LOCALVARIABLETABLE, ATT_SOURCEFILE, ATT_SYNTHETIC, 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_dup_x1, opc_dup_x2, opc_dup2, opc_dup2_x1, opc_dup2_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_ldc_w, opc_ldc2_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

SwitchInstruction(InstructionAccessor deflab, int[] matches, InstructionAccessor[] targets)
Constructs a switch instruction

SwitchInstruction(InstructionAccessor deflab, Vector<Integer> matches, Vector targets)
Constructs a switch instruction

SwitchInstruction(int opcode, InstructionAccessor deflab, int[] matches, InstructionAccessor[] targets)
Constructs a switch instruction

Method Summary

boolean	canComplete() Returns true iff control flow can reach the next instruction in textual order.
int	getMatch(int position) Returns the case's value at a position
int	getPushedOnStack() Returns the size of data pushed on the stack by this instruction
byte	getReturnType() Returns the type pushed on the stack
int	getStack() Return the amount of stack (positive or negative) used by this instruction
int	getSwitchCount() Gets the number of 'case'
InstructionAccessor	getTarget(int position) Returns the target at a position
void	selectSwitchType() Select the appropriate switch type (tableswitch or lookupswitch)
void	setTarget(InstructionAccessor target, int position) Sets the target for this instruction
void	setTarget(int position, InstructionAccessor accessor) Returns the target at a position
void	transformAccessors(AccessorTransformer transformer) Transforms targets (deferences to actual instructions).

Methods inherited from class at.dms.classfile.Instruction

dump, getOpcode, getPoppedFromStack, isLiteral

Methods inherited from class at.dms.classfile.AbstractInstructionAccessor

deepClone, deepCloneInto, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

SwitchInstruction

public SwitchInstruction(int opcode,
                         InstructionAccessor deflab,
                         int[] matches,
                         InstructionAccessor[] targets)

Constructs a switch instruction

Parameters:

opcode - the opcode of the instruction

deflab - default target for switch

matches - array of match values to compare the key to

targets - array of target instructions for each match value

SwitchInstruction

public SwitchInstruction(InstructionAccessor deflab,
                         int[] matches,
                         InstructionAccessor[] targets)

Constructs a switch instruction

Parameters:

deflab - default target for switch

matches - array of match values to compare the key to

targets - array of target instructions for each match value

SwitchInstruction

public SwitchInstruction(InstructionAccessor deflab,
                         Vector<Integer> matches,
                         Vector targets)

Constructs a switch instruction

Parameters:

deflab - default target for switch

matches - vector of match values to compare the key to

targets - vector of target instructions for each match value

Method Detail

canComplete

public boolean canComplete()

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

Specified by:

canComplete in class Instruction

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,
                      int position)

Sets the target for this instruction

getSwitchCount

public int getSwitchCount()

Gets the number of 'case'

getMatch

public int getMatch(int position)

Returns the case's value at a position

getTarget

public InstructionAccessor getTarget(int position)

Returns the target at a position

setTarget

public void setTarget(int position,
                      InstructionAccessor accessor)

Returns the target at a position

selectSwitchType

public void selectSwitchType()

Select the appropriate switch type (tableswitch or lookupswitch)

getReturnType

public byte getReturnType()

Returns the type pushed on the stack

Specified by:

getReturnType in class Instruction

getPushedOnStack

public int getPushedOnStack()

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

Specified by:

getPushedOnStack in class Instruction

getStack

public int getStack()

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

Specified by:

getStack in class Instruction