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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.asm 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.drools.asm.MethodWriter

MethodWriter
class MethodWriter implements MethodVisitor(Code)
A MethodVisitor that generates methods in bytecode form. Each visit method of this class appends the bytecode corresponding to the visited instruction to a byte vector, in the order these methods are called.
author:
   Eric Bruneton


Field Summary
 intclassReaderLength
     If not zero, indicates that the code of this method must be copied from the ClassReader associated to this writer in cw.cr.
 intclassReaderOffset
     If not zero, indicates that the code of this method must be copied from the ClassReader associated to this writer in cw.cr.
 ClassWritercw
     The class writer to which this method must be added.
 intexceptionCount
     Number of exceptions that can be thrown by this method.
 int[]exceptions
     The exceptions that can be thrown by this method.
 MethodWriternext
     Next method writer (see ClassWriter.firstMethod firstMethod ).
 Stringsignature
     The signature of this method.

Constructor Summary
 MethodWriter(ClassWriter cw, int access, String name, String desc, String signature, String[] exceptions, boolean computeMaxs)
     Constructs a new MethodWriter .
Parameters:
  cw - the class writer in which the method must be added.
Parameters:
  access - the method's access flags (see Opcodes).
Parameters:
  name - the method's name.
Parameters:
  desc - the method's descriptor (see Type).
Parameters:
  signature - the method's signature.

Method Summary
static  intgetNewOffset(int[] indexes, int[] sizes, int begin, int end)
     Computes the future value of a bytecode offset.
static  voidgetNewOffset(int[] indexes, int[] sizes, Label label)
     Updates the offset of the given label.
Parameters:
  indexes - current positions of the instructions to be resized.
final  intgetSize()
     Returns the size of the bytecode of this method.
final  voidput(ByteVector out)
     Puts the bytecode of this method in the given byte vector.
static  intreadInt(byte[] b, int index)
     Reads a signed int value in the given byte array.
Parameters:
  b - a byte array.
Parameters:
  index - the start index of the value to be read.
static  shortreadShort(byte[] b, int index)
     Reads a signed short value in the given byte array.
Parameters:
  b - a byte array.
Parameters:
  index - the start index of the value to be read.
static  intreadUnsignedShort(byte[] b, int index)
     Reads an unsigned short value in the given byte array.
Parameters:
  b - a byte array.
Parameters:
  index - the start index of the value to be read.
public  AnnotationVisitorvisitAnnotation(String desc, boolean visible)
    
public  AnnotationVisitorvisitAnnotationDefault()
    
public  voidvisitAttribute(Attribute attr)
    
public  voidvisitCode()
    
public  voidvisitEnd()
    
public  voidvisitFieldInsn(int opcode, String owner, String name, String desc)
    
public  voidvisitIincInsn(int var, int increment)
    
public  voidvisitInsn(int opcode)
    
public  voidvisitIntInsn(int opcode, int operand)
    
public  voidvisitJumpInsn(int opcode, Label label)
    
public  voidvisitLabel(Label label)
    
public  voidvisitLdcInsn(Object cst)
    
public  voidvisitLineNumber(int line, Label start)
    
public  voidvisitLocalVariable(String name, String desc, String signature, Label start, Label end, int index)
    
public  voidvisitLookupSwitchInsn(Label dflt, int keys, Label labels)
    
public  voidvisitMaxs(int maxStack, int maxLocals)
    
public  voidvisitMethodInsn(int opcode, String owner, String name, String desc)
    
public  voidvisitMultiANewArrayInsn(String desc, int dims)
    
public  AnnotationVisitorvisitParameterAnnotation(int parameter, String desc, boolean visible)
    
public  voidvisitTableSwitchInsn(int min, int max, Label dflt, Label labels)
    
public  voidvisitTryCatchBlock(Label start, Label end, Label handler, String type)
    
public  voidvisitTypeInsn(int opcode, String desc)
    
public  voidvisitVarInsn(int opcode, int var)
    
static  voidwriteShort(byte[] b, int index, int s)
     Writes a short value in the given byte array.

Field Detail
classReaderLength
int classReaderLength(Code)
If not zero, indicates that the code of this method must be copied from the ClassReader associated to this writer in cw.cr. More precisely, this field gives the number of bytes to copied from cw.cr.b.



classReaderOffset
int classReaderOffset(Code)
If not zero, indicates that the code of this method must be copied from the ClassReader associated to this writer in cw.cr. More precisely, this field gives the index of the first byte to copied from cw.cr.b.



cw
ClassWriter cw(Code)
The class writer to which this method must be added.



exceptionCount
int exceptionCount(Code)
Number of exceptions that can be thrown by this method.



exceptions
int[] exceptions(Code)
The exceptions that can be thrown by this method. More precisely, this array contains the indexes of the constant pool items that contain the internal names of these exception classes.



next
MethodWriter next(Code)
Next method writer (see ClassWriter.firstMethod firstMethod ).



signature
String signature(Code)
The signature of this method.




Constructor Detail
MethodWriter
MethodWriter(ClassWriter cw, int access, String name, String desc, String signature, String[] exceptions, boolean computeMaxs)(Code)
Constructs a new MethodWriter .
Parameters:
  cw - the class writer in which the method must be added.
Parameters:
  access - the method's access flags (see Opcodes).
Parameters:
  name - the method's name.
Parameters:
  desc - the method's descriptor (see Type).
Parameters:
  signature - the method's signature. May be null.
Parameters:
  exceptions - the internal names of the method's exceptions. May benull.
Parameters:
  computeMaxs - true if the maximum stack size and numberof local variables must be automatically computed.




Method Detail
getNewOffset
static int getNewOffset(int[] indexes, int[] sizes, int begin, int end)(Code)
Computes the future value of a bytecode offset.

Note: it is possible to have several entries for the same instruction in the indexes and sizes: two entries (index=a,size=b) and (index=a,size=b') are equivalent to a single entry (index=a,size=b+b').
Parameters:
  indexes - current positions of the instructions to be resized. Eachinstruction must be designated by the index of its lastbyte, plus one (or, in other words, by the index of the firstbyte of the next instruction).
Parameters:
  sizes - the number of bytes to be added to the aboveinstructions. More precisely, for each i < len,sizes[i] bytes will be added at the end of theinstruction designated by indexes[i] or, ifsizes[i] is negative, the last |sizes[i]|bytes of the instruction will be removed (the instruction sizemust not become negative or null).
Parameters:
  begin - index of the first byte of the source instruction.
Parameters:
  end - index of the first byte of the target instruction. the future value of the given bytecode offset.




getNewOffset
static void getNewOffset(int[] indexes, int[] sizes, Label label)(Code)
Updates the offset of the given label.
Parameters:
  indexes - current positions of the instructions to be resized. Eachinstruction must be designated by the index of its lastbyte, plus one (or, in other words, by the index of the firstbyte of the next instruction).
Parameters:
  sizes - the number of bytes to be added to the aboveinstructions. More precisely, for each i < len,sizes[i] bytes will be added at the end of theinstruction designated by indexes[i] or, ifsizes[i] is negative, the last |sizes[i]|bytes of the instruction will be removed (the instruction sizemust not become negative or null).
Parameters:
  label - the label whose offset must be updated.



getSize
final int getSize()(Code)
Returns the size of the bytecode of this method. the size of the bytecode of this method.



put
final void put(ByteVector out)(Code)
Puts the bytecode of this method in the given byte vector.
Parameters:
  out - the byte vector into which the bytecode of this method must becopied.



readInt
static int readInt(byte[] b, int index)(Code)
Reads a signed int value in the given byte array.
Parameters:
  b - a byte array.
Parameters:
  index - the start index of the value to be read. the read value.



readShort
static short readShort(byte[] b, int index)(Code)
Reads a signed short value in the given byte array.
Parameters:
  b - a byte array.
Parameters:
  index - the start index of the value to be read. the read value.



readUnsignedShort
static int readUnsignedShort(byte[] b, int index)(Code)
Reads an unsigned short value in the given byte array.
Parameters:
  b - a byte array.
Parameters:
  index - the start index of the value to be read. the read value.



visitAnnotation
public AnnotationVisitor visitAnnotation(String desc, boolean visible)(Code)



visitAnnotationDefault
public AnnotationVisitor visitAnnotationDefault()(Code)



visitAttribute
public void visitAttribute(Attribute attr)(Code)



visitCode
public void visitCode()(Code)



visitEnd
public void visitEnd()(Code)



visitFieldInsn
public void visitFieldInsn(int opcode, String owner, String name, String desc)(Code)



visitIincInsn
public void visitIincInsn(int var, int increment)(Code)



visitInsn
public void visitInsn(int opcode)(Code)



visitIntInsn
public void visitIntInsn(int opcode, int operand)(Code)



visitJumpInsn
public void visitJumpInsn(int opcode, Label label)(Code)



visitLabel
public void visitLabel(Label label)(Code)



visitLdcInsn
public void visitLdcInsn(Object cst)(Code)



visitLineNumber
public void visitLineNumber(int line, Label start)(Code)



visitLocalVariable
public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index)(Code)



visitLookupSwitchInsn
public void visitLookupSwitchInsn(Label dflt, int keys, Label labels)(Code)



visitMaxs
public void visitMaxs(int maxStack, int maxLocals)(Code)



visitMethodInsn
public void visitMethodInsn(int opcode, String owner, String name, String desc)(Code)



visitMultiANewArrayInsn
public void visitMultiANewArrayInsn(String desc, int dims)(Code)



visitParameterAnnotation
public AnnotationVisitor visitParameterAnnotation(int parameter, String desc, boolean visible)(Code)



visitTableSwitchInsn
public void visitTableSwitchInsn(int min, int max, Label dflt, Label labels)(Code)



visitTryCatchBlock
public void visitTryCatchBlock(Label start, Label end, Label handler, String type)(Code)



visitTypeInsn
public void visitTypeInsn(int opcode, String desc)(Code)



visitVarInsn
public void visitVarInsn(int opcode, int var)(Code)



writeShort
static void writeShort(byte[] b, int index, int s)(Code)
Writes a short value in the given byte array.
Parameters:
  b - a byte array.
Parameters:
  index - where the first byte of the short value must be written.
Parameters:
  s - the value to be written in the given byte array.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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