AdviceAdapter (GWT 2.6.1)

java.lang.Object
- com.google.gwt.dev.asm.MethodVisitor
- - com.google.gwt.dev.asm.commons.LocalVariablesSorter
  - - com.google.gwt.dev.asm.commons.GeneratorAdapter
    - - com.google.gwt.dev.asm.commons.AdviceAdapter

All Implemented Interfaces:

Opcodes
```
public abstract class AdviceAdapter
extends GeneratorAdapter
implements Opcodes
```
A MethodVisitor to insert before, after and around advices in methods and constructors.
The behavior for constructors is like this:
1. as long as the INVOKESPECIAL for the object initialization has not been reached, every bytecode instruction is dispatched in the ctor code visitor
2. when this one is reached, it is only added in the ctor code visitor and a JP invoke is added
3. after that, only the other code visitor receives the instructions
Author:

Eugene Kuleshov, Eric Bruneton

Field Summary

Fields
Modifier and Type Field and Description

protected int methodAccess

protected String methodDesc
- Fields inherited from class com.google.gwt.dev.asm.commons.GeneratorAdapter
  ADD, AND, DIV, EQ, GE, GT, LE, LT, MUL, NE, NEG, OR, REM, SHL, SHR, SUB, USHR, XOR
- Fields inherited from class com.google.gwt.dev.asm.commons.LocalVariablesSorter
  firstLocal, nextLocal
- Fields inherited from class com.google.gwt.dev.asm.MethodVisitor
  api, mv
- Fields inherited from interface com.google.gwt.dev.asm.Opcodes
  AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM4, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7

Fields
Modifier and Type	Field and Description
`protected int`	`methodAccess`
`protected String`	`methodDesc`

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`AdviceAdapter(int api, MethodVisitor mv, int access, String name, String desc)` Creates a new `AdviceAdapter`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected void`	`onMethodEnter()` Called at the beginning of the method or after super class class call in the constructor.
`protected void`	`onMethodExit(int opcode)` Called before explicit exit from the method using either return or throw.
`void`	`visitCode()` Starts the visit of the method's code, if any (i.e.
`void`	`visitFieldInsn(int opcode, String owner, String name, String desc)` Visits a field instruction.
`void`	`visitInsn(int opcode)` Visits a zero operand instruction.
`void`	`visitIntInsn(int opcode, int operand)` Visits an instruction with a single int operand.
`void`	`visitInvokeDynamicInsn(String name, String desc, Handle bsm, Object... bsmArgs)` Visits an invokedynamic instruction.
`void`	`visitJumpInsn(int opcode, Label label)` Visits a jump instruction.
`void`	`visitLabel(Label label)` Visits a label.
`void`	`visitLdcInsn(Object cst)` Visits a LDC instruction.
`void`	`visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels)` Visits a LOOKUPSWITCH instruction.
`void`	`visitMethodInsn(int opcode, String owner, String name, String desc)` Visits a method instruction.
`void`	`visitMultiANewArrayInsn(String desc, int dims)` Visits a MULTIANEWARRAY instruction.
`void`	`visitTableSwitchInsn(int min, int max, Label dflt, Label... labels)` Visits a TABLESWITCH instruction.
`void`	`visitTryCatchBlock(Label start, Label end, Label handler, String type)` Visits a try catch block.
`void`	`visitTypeInsn(int opcode, String type)` Visits a type instruction.
`void`	`visitVarInsn(int opcode, int var)` Visits a local variable instruction.

Methods inherited from class com.google.gwt.dev.asm.commons.GeneratorAdapter
arrayLength, arrayLoad, arrayStore, box, cast, catchException, checkCast, dup, dup2, dup2X1, dup2X2, dupX1, dupX2, endMethod, getField, getLocalType, getStatic, goTo, ifCmp, ifICmp, ifNonNull, ifNull, ifZCmp, iinc, instanceOf, invokeConstructor, invokeDynamic, invokeInterface, invokeStatic, invokeVirtual, loadArg, loadArgArray, loadArgs, loadArgs, loadLocal, loadLocal, loadThis, mark, mark, math, monitorEnter, monitorExit, newArray, newInstance, newLabel, not, pop, pop2, push, push, push, push, push, push, push, push, putField, putStatic, ret, returnValue, setLocalType, storeArg, storeLocal, storeLocal, swap, swap, tableSwitch, tableSwitch, throwException, throwException, unbox, valueOf

Methods inherited from class com.google.gwt.dev.asm.commons.LocalVariablesSorter
newLocal, newLocalMapping, updateNewLocals, visitFrame, visitIincInsn, visitLocalVariable, visitMaxs

Methods inherited from class com.google.gwt.dev.asm.MethodVisitor
visitAnnotation, visitAnnotationDefault, visitAttribute, visitEnd, visitLineNumber, visitParameterAnnotation

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, toString

- Field Detail
  - methodAccess
```
protected int methodAccess
```
  - methodDesc
```
protected String methodDesc
```
- Constructor Detail
  - AdviceAdapter
```
protected AdviceAdapter(int api,
                        MethodVisitor mv,
                        int access,
                        String name,
                        String desc)
```
    Creates a new AdviceAdapter.
    
    Parameters:
    
    api - the ASM API version implemented by this visitor. Must be one of Opcodes.ASM4.
    
    mv - the method visitor to which this adapter delegates calls.
    
    access - the method's access flags (see Opcodes).
    
    name - the method's name.
    
    desc - the method's descriptor (see Type).
- Method Detail
  - visitCode
```
public void visitCode()
```
    Description copied from class: MethodVisitor
    
    Starts the visit of the method's code, if any (i.e. non abstract method).
    
    Overrides:
    
    visitCode in class MethodVisitor
  - visitLabel
```
public void visitLabel(Label label)
```
    Description copied from class: MethodVisitor
    
    Visits a label. A label designates the instruction that will be visited just after it.
    
    Overrides:
    
    visitLabel in class MethodVisitor
    
    Parameters:
    
    label - a Label object.
  - visitInsn
```
public void visitInsn(int opcode)
```
    Description copied from class: MethodVisitor
    
    Visits a zero operand instruction.
    
    Overrides:
    
    visitInsn in class MethodVisitor
    
    Parameters:
    
    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.
  - visitVarInsn
```
public void visitVarInsn(int opcode,
                         int var)
```
    Description copied from class: MethodVisitor
    
    Visits a local variable instruction. A local variable instruction is an instruction that loads or stores the value of a local variable.
    
    Overrides:
    
    visitVarInsn in class LocalVariablesSorter
    
    Parameters:
    
    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.
  - visitFieldInsn
```
public void visitFieldInsn(int opcode,
                           String owner,
                           String name,
                           String desc)
```
    Description copied from class: MethodVisitor
    
    Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object.
    
    Overrides:
    
    visitFieldInsn in class MethodVisitor
    
    Parameters:
    
    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).
  - visitIntInsn
```
public void visitIntInsn(int opcode,
                         int operand)
```
    Description copied from class: MethodVisitor
    
    Visits an instruction with a single int operand.
    
    Overrides:
    
    visitIntInsn in class MethodVisitor
    
    Parameters:
    
    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.
    When opcode is BIPUSH, operand value should be between Byte.MIN_VALUE and Byte.MAX_VALUE.
    When opcode is SIPUSH, operand value should be between Short.MIN_VALUE and Short.MAX_VALUE.
    When opcode is NEWARRAY, operand value should be one of Opcodes.T_BOOLEAN, Opcodes.T_CHAR, Opcodes.T_FLOAT, Opcodes.T_DOUBLE, Opcodes.T_BYTE, Opcodes.T_SHORT, Opcodes.T_INT or Opcodes.T_LONG.
  - visitLdcInsn
```
public void visitLdcInsn(Object cst)
```
    Description copied from class: MethodVisitor
    Visits a LDC instruction. Note that new constant types may be added in future versions of the Java Virtual Machine. To easily detect new constant types, implementations of this method should check for unexpected constant types, like this:
```
 if (cst instanceof Integer) {
     // ...
 } else if (cst instanceof Float) {
     // ...
 } else if (cst instanceof Long) {
     // ...
 } else if (cst instanceof Double) {
     // ...
 } else if (cst instanceof String) {
     // ...
 } else if (cst instanceof Type) {
     int sort = ((Type) cst).getSort();
     if (sort == Type.OBJECT) {
         // ...
     } else if (sort == Type.ARRAY) {
         // ...
     } else if (sort == Type.METHOD) {
         // ...
     } else {
         // throw an exception
     }
 } else if (cst instanceof Handle) {
     // ...
 } else {
     // throw an exception
 }
 
```
    Overrides:
    
    visitLdcInsn in class MethodVisitor
    
    Parameters:
    
    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, a Type of OBJECT or ARRAY sort for .class constants, for classes whose version is 49.0, a Type of METHOD sort or a Handle for MethodType and MethodHandle constants, for classes whose version is 51.0.
  - visitMultiANewArrayInsn
```
public void visitMultiANewArrayInsn(String desc,
                                    int dims)
```
    Description copied from class: MethodVisitor
    
    Visits a MULTIANEWARRAY instruction.
    
    Overrides:
    
    visitMultiANewArrayInsn in class MethodVisitor
    
    Parameters:
    
    desc - an array type descriptor (see Type).
    
    dims - number of dimensions of the array to allocate.
  - visitTypeInsn
```
public void visitTypeInsn(int opcode,
                          String type)
```
    Description copied from class: MethodVisitor
    
    Visits a type instruction. A type instruction is an instruction that takes the internal name of a class as parameter.
    
    Overrides:
    
    visitTypeInsn in class MethodVisitor
    
    Parameters:
    
    opcode - the opcode of the type instruction to be visited. This opcode is either NEW, ANEWARRAY, CHECKCAST or INSTANCEOF.
    
    type - the operand of the instruction to be visited. This operand must be the internal name of an object or array class (see getInternalName).
  - visitMethodInsn
```
public void visitMethodInsn(int opcode,
                            String owner,
                            String name,
                            String desc)
```
    Description copied from class: MethodVisitor
    
    Visits a method instruction. A method instruction is an instruction that invokes a method.
    
    Overrides:
    
    visitMethodInsn in class MethodVisitor
    
    Parameters:
    
    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).
  - visitInvokeDynamicInsn
```
public void visitInvokeDynamicInsn(String name,
                                   String desc,
                                   Handle bsm,
                                   Object... bsmArgs)
```
    Description copied from class: MethodVisitor
    
    Visits an invokedynamic instruction.
    
    Overrides:
    
    visitInvokeDynamicInsn in class MethodVisitor
    
    Parameters:
    
    name - the method's name.
    
    desc - the method's descriptor (see Type).
    
    bsm - the bootstrap method.
    
    bsmArgs - the bootstrap method constant arguments. Each argument must be an Integer, Float, Long, Double, String, Type or Handle value. This method is allowed to modify the content of the array so a caller should expect that this array may change.
  - visitJumpInsn
```
public void visitJumpInsn(int opcode,
                          Label label)
```
    Description copied from class: MethodVisitor
    
    Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction.
    
    Overrides:
    
    visitJumpInsn in class MethodVisitor
    
    Parameters:
    
    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.
  - visitLookupSwitchInsn
```
public void visitLookupSwitchInsn(Label dflt,
                                  int[] keys,
                                  Label[] labels)
```
    Description copied from class: MethodVisitor
    
    Visits a LOOKUPSWITCH instruction.
    
    Overrides:
    
    visitLookupSwitchInsn in class MethodVisitor
    
    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.
  - visitTableSwitchInsn
```
public void visitTableSwitchInsn(int min,
                                 int max,
                                 Label dflt,
                                 Label... labels)
```
    Description copied from class: MethodVisitor
    
    Visits a TABLESWITCH instruction.
    
    Overrides:
    
    visitTableSwitchInsn in class MethodVisitor
    
    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.
  - visitTryCatchBlock
```
public void visitTryCatchBlock(Label start,
                               Label end,
                               Label handler,
                               String type)
```
    Description copied from class: MethodVisitor
    
    Visits a try catch block.
    
    Overrides:
    
    visitTryCatchBlock in class MethodVisitor
    
    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).
  - onMethodEnter
```
protected void onMethodEnter()
```
    Called at the beginning of the method or after super class class call in the constructor.
    
    Custom code can use or change all the local variables, but should not change state of the stack.
  - onMethodExit
```
protected void onMethodExit(int opcode)
```
    Called before explicit exit from the method using either return or throw. Top element on the stack contains the return value or exception instance. For example:
```
   public void onMethodExit(int opcode) {
     if(opcode==RETURN) {
         visitInsn(ACONST_NULL);
     } else if(opcode==ARETURN || opcode==ATHROW) {
         dup();
     } else {
         if(opcode==LRETURN || opcode==DRETURN) {
             dup2();
         } else {
             dup();
         }
         box(Type.getReturnType(this.methodDesc));
     }
     visitIntInsn(SIPUSH, opcode);
     visitMethodInsn(INVOKESTATIC, owner, "onExit", "(Ljava/lang/Object;I)V");
   }
 
   // an actual call back method
   public static void onExit(Object param, int opcode) {
     ...
 
```
    Custom code can use or change all the local variables, but should not change state of the stack.
    Parameters:
    
    opcode - one of the RETURN, IRETURN, FRETURN, ARETURN, LRETURN, DRETURN or ATHROW

Class AdviceAdapter

Field Summary

Fields inherited from class com.google.gwt.dev.asm.commons.GeneratorAdapter

Fields inherited from class com.google.gwt.dev.asm.commons.LocalVariablesSorter

Fields inherited from class com.google.gwt.dev.asm.MethodVisitor

Fields inherited from interface com.google.gwt.dev.asm.Opcodes

Constructor Summary

Method Summary

Methods inherited from class com.google.gwt.dev.asm.commons.GeneratorAdapter

Methods inherited from class com.google.gwt.dev.asm.commons.LocalVariablesSorter

Methods inherited from class com.google.gwt.dev.asm.MethodVisitor

Methods inherited from class java.lang.Object

Field Detail

methodAccess

methodDesc

Constructor Detail

AdviceAdapter

Method Detail

visitCode

visitLabel

visitInsn

visitVarInsn

visitFieldInsn

visitIntInsn

visitLdcInsn

visitMultiANewArrayInsn

visitTypeInsn

visitMethodInsn

visitInvokeDynamicInsn

visitJumpInsn

visitLookupSwitchInsn

visitTableSwitchInsn

visitTryCatchBlock

onMethodEnter

onMethodExit