org.logicalcobwebs.asm.util
Class DumpCodeVisitor

java.lang.Object
  org.logicalcobwebs.asm.util.PrintCodeVisitor
      org.logicalcobwebs.asm.util.DumpCodeVisitor

All Implemented Interfaces:

CodeVisitor

public class DumpCodeVisitor
extends PrintCodeVisitor

A PrintCodeVisitor that prints the ASM code that generates the code it visits.

Field Summary

private java.util.HashMap

labelNames The label names.

Fields inherited from class org.logicalcobwebs.asm.util.PrintCodeVisitor

buf, OPCODES, text

Constructor Summary

DumpCodeVisitor()
Constructs a new DumpCodeVisitor object.

Method Summary

private void	appendLabel(Label l) Appends the name of the given label to buf.
private void	declareLabel(Label l) Appends a declaration of the given label to buf.
void	printAttribute(Attribute attr) Prints a non standard code attribute.
void	printFieldInsn(int opcode, java.lang.String owner, java.lang.String name, java.lang.String desc) Prints a field instruction.
void	printIincInsn(int var, int increment) Prints an IINC instruction.
void	printInsn(int opcode) Prints a zero operand instruction.
void	printIntInsn(int opcode, int operand) Prints an instruction with a single int operand.
void	printJumpInsn(int opcode, Label label) Prints a jump instruction.
void	printLabel(Label label) Prints a label.
void	printLdcInsn(java.lang.Object cst) Prints a LDC instruction.
void	printLineNumber(int line, Label start) Prints a line number declaration.
void	printLocalVariable(java.lang.String name, java.lang.String desc, Label start, Label end, int index) Prints a local variable declaration.
void	printLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) Prints a LOOKUPSWITCH instruction.
void	printMaxs(int maxStack, int maxLocals) Prints the maximum stack size and the maximum number of local variables of the method.
void	printMethodInsn(int opcode, java.lang.String owner, java.lang.String name, java.lang.String desc) Prints a method instruction.
void	printMultiANewArrayInsn(java.lang.String desc, int dims) Prints a MULTIANEWARRAY instruction.
void	printTableSwitchInsn(int min, int max, Label dflt, Label[] labels) Prints a TABLESWITCH instruction.
void	printTryCatchBlock(Label start, Label end, Label handler, java.lang.String type) Prints a try catch block.
void	printTypeInsn(int opcode, java.lang.String desc) Prints a type instruction.
void	printVarInsn(int opcode, int var) Prints a local variable instruction.

Methods inherited from class org.logicalcobwebs.asm.util.PrintCodeVisitor

getText, visitAttribute, visitFieldInsn, visitIincInsn, visitInsn, visitIntInsn, visitJumpInsn, visitLabel, visitLdcInsn, visitLineNumber, visitLocalVariable, visitLookupSwitchInsn, visitMaxs, visitMethodInsn, visitMultiANewArrayInsn, visitTableSwitchInsn, visitTryCatchBlock, visitTypeInsn, visitVarInsn

Methods inherited from class java.lang.Object

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

Field Detail

labelNames

private final java.util.HashMap labelNames

The label names. This map associate String values to Label keys.

Constructor Detail

DumpCodeVisitor

public DumpCodeVisitor()

Constructs a new DumpCodeVisitor object.

Method Detail

printInsn

public void printInsn(int opcode)

Description copied from class: PrintCodeVisitor

Prints a zero operand instruction.

Specified by:

printInsn in class PrintCodeVisitor

Parameters:

opcode - the opcode of the instruction to be printed. This opcode is either NOP, ACONST_NULL, ICONST_M1, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, LCONST_0, LCONST_1, FCONST_0, FCONST_1, FCONST_2, DCONST_0, DCONST_1, IALOAD, LALOAD, FALOAD, DALOAD, AALOAD, BALOAD, CALOAD, SALOAD, IASTORE, LASTORE, FASTORE, DASTORE, AASTORE, BASTORE, CASTORE, SASTORE, POP, POP2, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, SWAP, IADD, LADD, FADD, DADD, ISUB, LSUB, FSUB, DSUB, IMUL, LMUL, FMUL, DMUL, IDIV, LDIV, FDIV, DDIV, IREM, LREM, FREM, DREM, INEG, LNEG, FNEG, DNEG, ISHL, LSHL, ISHR, LSHR, IUSHR, LUSHR, IAND, LAND, IOR, LOR, IXOR, LXOR, I2L, I2F, I2D, L2I, L2F, L2D, F2I, F2L, F2D, D2I, D2L, D2F, I2B, I2C, I2S, LCMP, FCMPL, FCMPG, DCMPL, DCMPG, IRETURN, LRETURN, FRETURN, DRETURN, ARETURN, RETURN, ARRAYLENGTH, ATHROW, MONITORENTER, or MONITOREXIT.

printIntInsn

public void printIntInsn(int opcode,
                         int operand)

Description copied from class: PrintCodeVisitor

Prints an instruction with a single int operand.

Specified by:

printIntInsn in class PrintCodeVisitor

Parameters:

opcode - the opcode of the instruction to be printed. This opcode is either BIPUSH, SIPUSH or NEWARRAY.

operand - the operand of the instruction to be printed.

printVarInsn

public void printVarInsn(int opcode,
                         int var)

Description copied from class: PrintCodeVisitor

Prints a local variable instruction. A local variable instruction is an instruction that loads or stores the value of a local variable.

Specified by:

printVarInsn in class PrintCodeVisitor

Parameters:

opcode - the opcode of the local variable instruction to be printed. This opcode is either ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE or RET.

var - the operand of the instruction to be printed. This operand is the index of a local variable.

printTypeInsn

public void printTypeInsn(int opcode,
                          java.lang.String desc)

Description copied from class: PrintCodeVisitor

Prints a type instruction. A type instruction is an instruction that takes a type descriptor as parameter.

Specified by:

printTypeInsn in class PrintCodeVisitor

Parameters:

opcode - the opcode of the type instruction to be printed. This opcode is either NEW, ANEWARRAY, CHECKCAST or INSTANCEOF.

desc - the operand of the instruction to be printed. This operand is must be a fully qualified class name in internal form, or a the type descriptor of an array type (see Type).

printFieldInsn

public void printFieldInsn(int opcode,
                           java.lang.String owner,
                           java.lang.String name,
                           java.lang.String desc)

Description copied from class: PrintCodeVisitor

Prints a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object.

Specified by:

printFieldInsn in class PrintCodeVisitor

Parameters:

opcode - the opcode of the type instruction to be printed. This opcode is either GETSTATIC, PUTSTATIC, GETFIELD or PUTFIELD.

owner - the internal name of the field's owner class (see getInternalName).

name - the field's name.

desc - the field's descriptor (see Type).

printMethodInsn

public void printMethodInsn(int opcode,
                            java.lang.String owner,
                            java.lang.String name,
                            java.lang.String desc)

Description copied from class: PrintCodeVisitor

Prints a method instruction. A method instruction is an instruction that invokes a method.

Specified by:

printMethodInsn in class PrintCodeVisitor

Parameters:

opcode - the opcode of the type instruction to be printed. This opcode is either INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC or INVOKEINTERFACE.

owner - the internal name of the method's owner class (see getInternalName).

name - the method's name.

desc - the method's descriptor (see Type).

printJumpInsn

public void printJumpInsn(int opcode,
                          Label label)

Description copied from class: PrintCodeVisitor

Prints a jump instruction. A jump instruction is an instruction that may jump to another instruction.

Specified by:

printJumpInsn in class PrintCodeVisitor

Parameters:

opcode - the opcode of the type instruction to be printed. This opcode is either IFEQ, IFNE, IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ, IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ, IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.

label - the operand of the instruction to be printed. This operand is a label that designates the instruction to which the jump instruction may jump.

printLabel

public void printLabel(Label label)

Description copied from class: PrintCodeVisitor

Prints a label. A label designates the instruction that will be visited just after it.

Specified by:

printLabel in class PrintCodeVisitor

Parameters:

label - a Label object.

printLdcInsn

public void printLdcInsn(java.lang.Object cst)

Description copied from class: PrintCodeVisitor

Prints a LDC instruction.

Specified by:

printLdcInsn in class PrintCodeVisitor

Parameters:

cst - the constant to be loaded on the stack. This parameter must be a non null Integer, a Float, a Long, a Double or a String.

printIincInsn

public void printIincInsn(int var,
                          int increment)

Description copied from class: PrintCodeVisitor

Prints an IINC instruction.

Specified by:

printIincInsn in class PrintCodeVisitor

Parameters:

var - index of the local variable to be incremented.

increment - amount to increment the local variable by.

printTableSwitchInsn

public void printTableSwitchInsn(int min,
                                 int max,
                                 Label dflt,
                                 Label[] labels)

Description copied from class: PrintCodeVisitor

Prints a TABLESWITCH instruction.

Specified by:

printTableSwitchInsn in class PrintCodeVisitor

Parameters:

min - the minimum key value.

max - the maximum key value.

dflt - beginning of the default handler block.

labels - beginnings of the handler blocks. labels[i] is the beginning of the handler block for the min + i key.

printLookupSwitchInsn

public void printLookupSwitchInsn(Label dflt,
                                  int[] keys,
                                  Label[] labels)

Description copied from class: PrintCodeVisitor

Prints a LOOKUPSWITCH instruction.

Specified by:

printLookupSwitchInsn in class PrintCodeVisitor

Parameters:

dflt - beginning of the default handler block.

keys - the values of the keys.

labels - beginnings of the handler blocks. labels[i] is the beginning of the handler block for the keys[i] key.

printMultiANewArrayInsn

public void printMultiANewArrayInsn(java.lang.String desc,
                                    int dims)

Description copied from class: PrintCodeVisitor

Prints a MULTIANEWARRAY instruction.

Specified by:

printMultiANewArrayInsn in class PrintCodeVisitor

Parameters:

desc - an array type descriptor (see Type).

dims - number of dimensions of the array to allocate.

printTryCatchBlock

public void printTryCatchBlock(Label start,
                               Label end,
                               Label handler,
                               java.lang.String type)

Description copied from class: PrintCodeVisitor

Prints a try catch block.

Specified by:

printTryCatchBlock in class PrintCodeVisitor

Parameters:

start - beginning of the exception handler's scope (inclusive).

end - end of the exception handler's scope (exclusive).

handler - beginning of the exception handler's code.

type - internal name of the type of exceptions handled by the handler, or null to catch any exceptions (for "finally" blocks).

printMaxs

public void printMaxs(int maxStack,
                      int maxLocals)

Description copied from class: PrintCodeVisitor

Prints the maximum stack size and the maximum number of local variables of the method.

Specified by:

printMaxs in class PrintCodeVisitor

Parameters:

maxStack - maximum stack size of the method.

maxLocals - maximum number of local variables for the method.

printLocalVariable

public void printLocalVariable(java.lang.String name,
                               java.lang.String desc,
                               Label start,
                               Label end,
                               int index)

Description copied from class: PrintCodeVisitor

Prints a local variable declaration.

Specified by:

printLocalVariable in class PrintCodeVisitor

Parameters:

name - the name of a local variable.

desc - the type descriptor of this local variable.

start - the first instruction corresponding to the scope of this local variable (inclusive).

end - the last instruction corresponding to the scope of this local variable (exclusive).

index - the local variable's index.

printLineNumber

public void printLineNumber(int line,
                            Label start)

Description copied from class: PrintCodeVisitor

Prints a line number declaration.

Specified by:

printLineNumber in class PrintCodeVisitor

Parameters:

line - a line number. This number refers to the source file from which the class was compiled.

start - the first instruction corresponding to this line number.

printAttribute

public void printAttribute(Attribute attr)

Description copied from class: PrintCodeVisitor

Prints a non standard code attribute.

Specified by:

printAttribute in class PrintCodeVisitor

Parameters:

attr - a non standard code attribute.

declareLabel

private void declareLabel(Label l)

Appends a declaration of the given label to buf. This declaration is of the form "Label lXXX = new Label();". Does nothing if the given label has already been declared.

Parameters:

l - a label.

appendLabel

private void appendLabel(Label l)

Appends the name of the given label to buf. The given label must already have a name. One way to ensure this is to always call declared before calling this method.

Parameters:

l - a label.