Package org.apache.bcel.generic
Class Select
- java.lang.Object
-
- org.apache.bcel.generic.Instruction
-
- org.apache.bcel.generic.BranchInstruction
-
- org.apache.bcel.generic.Select
-
- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
,InstructionTargeter
,StackConsumer
,VariableLengthInstruction
- Direct Known Subclasses:
LOOKUPSWITCH
,TABLESWITCH
public abstract class Select extends BranchInstruction implements VariableLengthInstruction, StackConsumer
Select - Abstract super class for LOOKUPSWITCH and TABLESWITCH instructions.We use our super's
target
property as the default target.- See Also:
LOOKUPSWITCH
,TABLESWITCH
,InstructionList
, Serialized Form
-
-
Field Summary
Fields Modifier and Type Field Description protected int
fixed_length
protected int[]
indices
protected int[]
match
protected int
match_length
protected int
padding
protected InstructionHandle[]
targets
-
Fields inherited from class org.apache.bcel.generic.BranchInstruction
index, position, target
-
Fields inherited from class org.apache.bcel.generic.Instruction
length, opcode
-
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected java.lang.Object
clone()
boolean
containsTarget(InstructionHandle ih)
void
dump(java.io.DataOutputStream out)
Dump instruction as byte code to stream out.int[]
getIndices()
int[]
getMatchs()
InstructionHandle[]
getTargets()
protected void
initFromFile(ByteSequence bytes, boolean wide)
Read needed data (e.g.void
setTarget(int i, InstructionHandle target)
Set branch target for `i'th casejava.lang.String
toString(boolean verbose)
Long output format: <position in byte code> <name of opcode> "["<opcode number>"]" "("<length of instruction>")" "<"<target instruction>">" "@"<branch target offset>protected int
updatePosition(int offset, int max_offset)
Since this is a variable length instruction, it may shift the following instructions which then need to update their position.void
updateTarget(InstructionHandle old_ih, InstructionHandle new_ih)
-
Methods inherited from class org.apache.bcel.generic.BranchInstruction
getIndex, getTarget, getTargetOffset, getTargetOffset, setTarget
-
Methods inherited from class org.apache.bcel.generic.Instruction
accept, consumeStack, copy, equals, getComparator, getLength, getName, getOpcode, hashCode, produceStack, readInstruction, setComparator, toString, toString
-
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
-
Methods inherited from interface org.apache.bcel.generic.StackConsumer
consumeStack
-
-
-
-
Field Detail
-
match
protected int[] match
-
indices
protected int[] indices
-
targets
protected InstructionHandle[] targets
-
fixed_length
protected int fixed_length
-
match_length
protected int match_length
-
padding
protected int padding
-
-
Method Detail
-
updatePosition
protected int updatePosition(int offset, int max_offset)
Since this is a variable length instruction, it may shift the following instructions which then need to update their position. Called by InstructionList.setPositions when setting the position for every instruction. In the presence of variable length instructions `setPositions' performs multiple passes over the instruction list to calculate the correct (byte) positions and offsets by calling this function.- Overrides:
updatePosition
in classBranchInstruction
- Parameters:
offset
- additional offset caused by preceding (variable length) instructionsmax_offset
- the maximum offset that may be caused by these instructions- Returns:
- additional offset caused by possible change of this instruction's length
-
dump
public void dump(java.io.DataOutputStream out) throws java.io.IOException
Dump instruction as byte code to stream out.- Overrides:
dump
in classBranchInstruction
- Parameters:
out
- Output stream- Throws:
java.io.IOException
-
initFromFile
protected void initFromFile(ByteSequence bytes, boolean wide) throws java.io.IOException
Read needed data (e.g. index) from file.- Overrides:
initFromFile
in classBranchInstruction
- Parameters:
bytes
- input streamwide
- wide prefix?- Throws:
java.io.IOException
- may be thrown if the implementation needs to read data from the file- See Also:
InstructionList
-
toString
public java.lang.String toString(boolean verbose)
Description copied from class:BranchInstruction
Long output format: <position in byte code> <name of opcode> "["<opcode number>"]" "("<length of instruction>")" "<"<target instruction>">" "@"<branch target offset>- Overrides:
toString
in classBranchInstruction
- Parameters:
verbose
- long/short format switch- Returns:
- mnemonic for instruction
-
setTarget
public void setTarget(int i, InstructionHandle target)
Set branch target for `i'th case
-
updateTarget
public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih)
- Specified by:
updateTarget
in interfaceInstructionTargeter
- Overrides:
updateTarget
in classBranchInstruction
- Parameters:
old_ih
- old targetnew_ih
- new target
-
containsTarget
public boolean containsTarget(InstructionHandle ih)
- Specified by:
containsTarget
in interfaceInstructionTargeter
- Overrides:
containsTarget
in classBranchInstruction
- Returns:
- true, if ih is target of this instruction
-
clone
protected java.lang.Object clone() throws java.lang.CloneNotSupportedException
- Overrides:
clone
in classjava.lang.Object
- Throws:
java.lang.CloneNotSupportedException
-
getMatchs
public int[] getMatchs()
- Returns:
- array of match indices
-
getIndices
public int[] getIndices()
- Returns:
- array of match target offsets
-
getTargets
public InstructionHandle[] getTargets()
- Returns:
- array of match targets
-
-