Class ByteCode
- java.lang.Object
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- org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry
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- org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode
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public class ByteCode extends ClassFileEntry
A bytecode class file entry.
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Field Summary
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Fields inherited from class org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry
NONE
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Constructor Summary
Constructors Modifier Constructor Description protected
ByteCode(int opcode)
protected
ByteCode(int opcode, ClassFileEntry[] nested)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
applyByteCodeTargetFixup(CodeAttribute codeAttribute)
Some ByteCodes (in particular, those with labels need to be fixed up after all the bytecodes in the CodeAttribute have been added.protected void
doWrite(java.io.DataOutputStream dos)
boolean
equals(java.lang.Object obj)
void
extractOperands(OperandManager operandManager, Segment segment, int codeLength)
static ByteCode
getByteCode(int opcode)
protected ByteCodeForm
getByteCodeForm()
int
getByteCodeIndex()
int[]
getByteCodeTargets()
int
getLength()
java.lang.String
getName()
ClassFileEntry[]
getNestedClassFileEntries()
int[]
getNestedPosition(int index)
int[][]
getNestedPositions()
int
getOpcode()
int[]
getRewrite()
Some bytecodes (the ones with variable lengths) can't have a static rewrite array - they need the ability to update the array.int
hashCode()
boolean
hasMultipleByteCodes()
This method will answer true if the receiver is a multi-bytecode instruction (such as aload0_putfield_super); otherwise, it will answer false.boolean
nestedMustStartClassPool()
protected void
resolve(ClassConstantPool pool)
Allows the constant pool entries to resolve their nested entries.void
setByteCodeIndex(int byteCodeOffset)
ByteCodes may need to know their position in the code array (in particular, label byte codes need to know where they are in order to calculate their targets).void
setByteCodeTargets(int[] byteCodeTargets)
Some ByteCodes (in particular, those with labels) have to keep track of byteCodeTargets.void
setNested(ClassFileEntry[] nested)
void
setNestedPositions(int[][] nestedPositions)
nestedPositions is an array of arrays of ints.void
setOperand2Bytes(int operand, int position)
Given an int operand, set the rewrite bytes for that position and the one immediately following it to a high-byte, low-byte encoding of the operand.void
setOperandByte(int operand, int position)
Given an int operand, treat it as a byte and set the rewrite byte for that position to that value.void
setOperandBytes(int[] operands)
Given an array of ints which correspond to bytes in the operand of the bytecode, set the rewrite bytes of the operand to be the appropriate values.void
setOperandSigned2Bytes(int operand, int position)
This is just like setOperandInt, but takes special care when the operand is less than 0 to make sure it's written correctly.void
setRewrite(int[] rewrite)
Some bytecodes (the ones with variable lengths) can't have a static rewrite array - they need the ability to update the array.java.lang.String
toString()
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Methods inherited from class org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry
objectHashCode, write
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Constructor Detail
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ByteCode
protected ByteCode(int opcode)
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ByteCode
protected ByteCode(int opcode, ClassFileEntry[] nested)
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Method Detail
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getByteCode
public static ByteCode getByteCode(int opcode)
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doWrite
protected void doWrite(java.io.DataOutputStream dos) throws java.io.IOException
- Specified by:
doWrite
in classClassFileEntry
- Throws:
java.io.IOException
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equals
public boolean equals(java.lang.Object obj)
- Specified by:
equals
in classClassFileEntry
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extractOperands
public void extractOperands(OperandManager operandManager, Segment segment, int codeLength)
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getByteCodeForm
protected ByteCodeForm getByteCodeForm()
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getLength
public int getLength()
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getName
public java.lang.String getName()
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getNestedClassFileEntries
public ClassFileEntry[] getNestedClassFileEntries()
- Overrides:
getNestedClassFileEntries
in classClassFileEntry
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getOpcode
public int getOpcode()
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hashCode
public int hashCode()
- Specified by:
hashCode
in classClassFileEntry
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resolve
protected void resolve(ClassConstantPool pool)
Description copied from class:ClassFileEntry
Allows the constant pool entries to resolve their nested entries.- Overrides:
resolve
in classClassFileEntry
- Parameters:
pool
- TODO
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setOperandBytes
public void setOperandBytes(int[] operands)
Given an array of ints which correspond to bytes in the operand of the bytecode, set the rewrite bytes of the operand to be the appropriate values. All values in operands[] will be masked with 0xFF so they fit into a byte.- Parameters:
operands
- int[] rewrite operand bytes
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setOperand2Bytes
public void setOperand2Bytes(int operand, int position)
Given an int operand, set the rewrite bytes for that position and the one immediately following it to a high-byte, low-byte encoding of the operand.- Parameters:
operand
- int to set the rewrite bytes toposition
- int position in the operands of the rewrite bytes. For a rewrite array of {100, -1, -1, -1} position 0 is the first -1, position 1 is the second -1, etc.
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setOperandSigned2Bytes
public void setOperandSigned2Bytes(int operand, int position)
This is just like setOperandInt, but takes special care when the operand is less than 0 to make sure it's written correctly.- Parameters:
operand
- int to set the rewrite bytes toposition
- int position of the operands in the rewrite bytes
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setOperandByte
public void setOperandByte(int operand, int position)
Given an int operand, treat it as a byte and set the rewrite byte for that position to that value. Mask of anything beyond 0xFF.- Parameters:
operand
- int to set the rewrite byte to (unsigned)position
- int position in the operands of the rewrite bytes. For a rewrite array of {100, -1, -1, -1} position 0 is the first -1, position 1 is the second -1, etc.
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toString
public java.lang.String toString()
- Specified by:
toString
in classClassFileEntry
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setNested
public void setNested(ClassFileEntry[] nested)
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setNestedPositions
public void setNestedPositions(int[][] nestedPositions)
nestedPositions is an array of arrays of ints. Each subarray specifies a position of a nested element (from the nested[] array) and the length of that element. For instance, one might have a nested of: {CPClass java/lang/Foo, CPFloat 3.14} The nestedPositions would then be: {{0,2},{2,2}} In other words, when the bytecode is resolved, the CPClass will be resolved to an int and inserted at position 0 and 1 of the rewrite arguments (the first occurrences of -1). The CPFloat will be resolved to an int position and inserted at positions 2 and 3 of the rewrite arguments.- Parameters:
nestedPositions
- Each subarray specifies a position of a nested element (from the nested[] array) and the length of that element.
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getNestedPositions
public int[][] getNestedPositions()
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getNestedPosition
public int[] getNestedPosition(int index)
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hasMultipleByteCodes
public boolean hasMultipleByteCodes()
This method will answer true if the receiver is a multi-bytecode instruction (such as aload0_putfield_super); otherwise, it will answer false.- Returns:
- boolean true if multibytecode, false otherwise
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setByteCodeIndex
public void setByteCodeIndex(int byteCodeOffset)
ByteCodes may need to know their position in the code array (in particular, label byte codes need to know where they are in order to calculate their targets). This method lets the CodeAttribute specify where the byte code is. Since there are no aload0+label instructions, this method doesn't worry about multioperation bytecodes.- Parameters:
byteCodeOffset
- int position in code array.
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getByteCodeIndex
public int getByteCodeIndex()
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setByteCodeTargets
public void setByteCodeTargets(int[] byteCodeTargets)
Some ByteCodes (in particular, those with labels) have to keep track of byteCodeTargets. These are initially offsets in the CodeAttribute array relative to the byteCodeOffset, but later get fixed up to point to the absolute position in the CodeAttribute array. This method sets the targets.- Parameters:
byteCodeTargets
- int index in array
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getByteCodeTargets
public int[] getByteCodeTargets()
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applyByteCodeTargetFixup
public void applyByteCodeTargetFixup(CodeAttribute codeAttribute)
Some ByteCodes (in particular, those with labels need to be fixed up after all the bytecodes in the CodeAttribute have been added. (This can't be done beforehand because the CodeAttribute needs to be complete before targets can be assigned.)- Parameters:
codeAttribute
- the code attribute
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setRewrite
public void setRewrite(int[] rewrite)
Some bytecodes (the ones with variable lengths) can't have a static rewrite array - they need the ability to update the array. This method permits that. Note that this should not be called from bytecodes which have a static rewrite; use the table in ByteCodeForm instead to specify those rewrites.- Parameters:
rewrite
- Some bytecodes.
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getRewrite
public int[] getRewrite()
Some bytecodes (the ones with variable lengths) can't have a static rewrite array - they need the ability to update the array. This method permits their associated bytecode formst to query their rewrite array. Note that this should not be called from bytecodes which have a static rewrite; use the table in ByteCodeForm instead to specify those rewrites.- Returns:
- Some bytecodes.
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nestedMustStartClassPool
public boolean nestedMustStartClassPool()
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