A visitor to visit the bytecode instructions of a Java method. The methods
of this visitor must be called in the sequential order of the bytecode
instructions of the visited code. The
visitMaxs
method
must be called after all the instructions have been visited. The
visitTryCatchBlock
,
visitLocalVariable
and
visitLineNumber
methods may
be called in any order, at any time (provided the labels passed as arguments
have already been visited with
visitLabel
).
visitAttribute
public void visitAttribute(Attribute attr)
Visits a non standard attribute of the code. This method must visit only
the first attribute in the given attribute list.
attr
- a non standard code attribute. Must not be null.
visitFieldInsn
public void visitFieldInsn(int opcode,
String owner,
String name,
String desc)
Visits a field instruction. A field instruction is an instruction that
loads or stores the value of a field of an object.
opcode
- the opcode of the type instruction to be visited. 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
).
visitIincInsn
public void visitIincInsn(int var,
int increment)
Visits an IINC instruction.
var
- index of the local variable to be incremented.increment
- amount to increment the local variable by.
visitInsn
public void visitInsn(int opcode)
Visits a zero operand instruction.
opcode
- the opcode of the instruction to be visited. 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.
visitIntInsn
public void visitIntInsn(int opcode,
int operand)
Visits an instruction with a single int operand.
opcode
- the opcode of the instruction to be visited. This opcode is
either BIPUSH, SIPUSH or NEWARRAY.operand
- the operand of the instruction to be visited.
visitJumpInsn
public void visitJumpInsn(int opcode,
Label label)
Visits a jump instruction. A jump instruction is an instruction that may
jump to another instruction.
opcode
- the opcode of the type instruction to be visited. 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 visited. This operand is
a label that designates the instruction to which the jump instruction
may jump.
visitLabel
public void visitLabel(Label label)
Visits a label. A label designates the instruction that will be visited
just after it.
visitLdcInsn
public void visitLdcInsn(Object cst)
Visits a LDC instruction.
cst
- the constant to be loaded on the stack. This parameter must be
a non null Integer
, a Float
, a Long
, a Double
a String
(or a Type
for
.class constants, for classes whose version is 49.0 or more).
visitLineNumber
public void visitLineNumber(int line,
Label start)
Visits a line number declaration.
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.
visitLocalVariable
public void visitLocalVariable(String name,
String desc,
Label start,
Label end,
int index)
Visits a local variable declaration.
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.
visitLookupSwitchInsn
public void visitLookupSwitchInsn(Label dflt,
keys[] ,
labels[] )
Visits a LOOKUPSWITCH instruction.
dflt
- beginning of the default handler block.
visitMaxs
public void visitMaxs(int maxStack,
int maxLocals)
Visits the maximum stack size and the maximum number of local variables of
the method.
maxStack
- maximum stack size of the method.maxLocals
- maximum number of local variables for the method.
visitMethodInsn
public void visitMethodInsn(int opcode,
String owner,
String name,
String desc)
Visits a method instruction. A method instruction is an instruction that
invokes a method.
opcode
- the opcode of the type instruction to be visited. 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
).
visitMultiANewArrayInsn
public void visitMultiANewArrayInsn(String desc,
int dims)
Visits a MULTIANEWARRAY instruction.
desc
- an array type descriptor (see Type
).dims
- number of dimensions of the array to allocate.
visitTableSwitchInsn
public void visitTableSwitchInsn(int min,
int max,
Label dflt,
labels[] )
Visits a TABLESWITCH instruction.
min
- the minimum key value.max
- the maximum key value.dflt
- beginning of the default handler block.
visitTryCatchBlock
public void visitTryCatchBlock(Label start,
Label end,
Label handler,
String type)
Visits a try catch block.
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).
visitTypeInsn
public void visitTypeInsn(int opcode,
String desc)
Visits a type instruction. A type instruction is an instruction that
takes a type descriptor as parameter.
opcode
- the opcode of the type instruction to be visited. This opcode
is either NEW, ANEWARRAY, CHECKCAST or INSTANCEOF.desc
- the operand of the instruction to be visited. This operand is
must be a fully qualified class name in internal form, or the type
descriptor of an array type (see Type
).
visitVarInsn
public void visitVarInsn(int opcode,
int var)
Visits a local variable instruction. A local variable instruction is an
instruction that loads or stores the value of a local variable.
opcode
- the opcode of the local variable instruction to be visited.
This opcode is either ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE,
LSTORE, FSTORE, DSTORE, ASTORE or RET.var
- the operand of the instruction to be visited. This operand is
the index of a local variable.