程序包 cn.taketoday.bytecode.commons

类 AdviceAdapter

java.lang.Object
cn.taketoday.bytecode.MethodVisitor
cn.taketoday.bytecode.commons.LocalVariablesSorter
cn.taketoday.bytecode.commons.GeneratorAdapter
cn.taketoday.bytecode.commons.AdviceAdapter
所有已实现的接口:
Opcodes
public abstract class AdviceAdapter extends GeneratorAdapter implements Opcodes
A MethodVisitor to insert before, after and around advices in methods and constructors. For constructors, the code keeps track of the elements on the stack in order to detect when the super class constructor is called (note that there can be multiple such calls in different branches). onMethodEnter is called after each super class constructor call, because the object cannot be used before it is properly initialized.
作者:
Eugene Kuleshov, Eric Bruneton

  • 字段详细资料

    • methodAccess

      protected int methodAccess
      The access flags of the visited method.

    • methodDesc

      protected String methodDesc
      The descriptor of the visited method.

  • 构造器详细资料

    • AdviceAdapter

      protected AdviceAdapter(MethodVisitor methodVisitor, int access, String name, String descriptor)
      Constructs a new AdviceAdapter.
      参数:
      methodVisitor - the method visitor to which this adapter delegates calls.
      access - the method's access flags (see Opcodes).
      name - the method's name.
      descriptor - the method's descriptor (see Type).

  • 方法详细资料

    • visitCode

      public void visitCode()
      从类复制的说明: MethodVisitor
      Starts the visit of the method's code, if any (i.e. non abstract method).
      覆盖:
      visitCode 在类中 MethodVisitor

    • visitLabel

      public void visitLabel(Label label)
      从类复制的说明: MethodVisitor
      Visits a label. A label designates the instruction that will be visited just after it.
      覆盖:
      visitLabel 在类中 MethodVisitor
      参数:
      label - a Label object.

    • visitInsn

      public void visitInsn(int opcode)
      从类复制的说明: MethodVisitor
      Visits a zero operand instruction.
      覆盖:
      visitInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a local variable instruction. A local variable instruction is an instruction that loads or stores the value of a local variable.
      覆盖:
      visitVarInsn 在类中 LocalVariablesSorter
      参数:
      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 descriptor)
      从类复制的说明: MethodVisitor
      Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an object.
      覆盖:
      visitFieldInsn 在类中 MethodVisitor
      参数:
      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 Type.getInternalName()).
      name - the field's name.
      descriptor - the field's descriptor (see Type).

    • visitIntInsn

      public void visitIntInsn(int opcode, int operand)
      从类复制的说明: MethodVisitor
      Visits an instruction with a single int operand.
      覆盖:
      visitIntInsn 在类中 MethodVisitor
      参数:
      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 value)
      从类复制的说明: 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 if (cst instanceof ConstantDynamic) {
     // ...
 } else {
     // throw an exception
 }
      覆盖:
      visitLdcInsn 在类中 MethodVisitor
      参数:
      value - 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, a Type of METHOD sort for MethodType, a Handle for MethodHandle constants, for classes whose version is 51 or a ConstantDynamic for a constant dynamic for classes whose version is 55.

    • visitMultiANewArrayInsn

      public void visitMultiANewArrayInsn(String descriptor, int numDimensions)
      从类复制的说明: MethodVisitor
      Visits a MULTIANEWARRAY instruction.
      覆盖:
      visitMultiANewArrayInsn 在类中 MethodVisitor
      参数:
      descriptor - an array type descriptor (see Type).
      numDimensions - the number of dimensions of the array to allocate.

    • visitTypeInsn

      public void visitTypeInsn(int opcode, String type)
      从类复制的说明: MethodVisitor
      Visits a type instruction. A type instruction is an instruction that takes the internal name of a class as parameter.
      覆盖:
      visitTypeInsn 在类中 MethodVisitor
      参数:
      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 Type.getInternalName()).

    • visitMethodInsn

      public void visitMethodInsn(int opcodeAndSource, String owner, String name, String descriptor, boolean isInterface)
      从类复制的说明: MethodVisitor
      Visits a method instruction. A method instruction is an instruction that invokes a method.
      覆盖:
      visitMethodInsn 在类中 MethodVisitor
      参数:
      opcodeAndSource - 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 Type.getInternalName()).
      name - the method's name.
      descriptor - the method's descriptor (see Type).
      isInterface - if the method's owner class is an interface.

    • visitInvokeDynamicInsn

      public void visitInvokeDynamicInsn(String name, String descriptor, Handle bootstrapMethodHandle, Object... bootstrapMethodArguments)
      从类复制的说明: MethodVisitor
      Visits an invokedynamic instruction.
      覆盖:
      visitInvokeDynamicInsn 在类中 MethodVisitor
      参数:
      name - the method's name.
      descriptor - the method's descriptor (see Type).
      bootstrapMethodHandle - the bootstrap method.
      bootstrapMethodArguments - the bootstrap method constant arguments. Each argument must be an Integer, Float, Long, Double, String, Type, Handle or ConstantDynamic 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)
      从类复制的说明: MethodVisitor
      Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction.
      覆盖:
      visitJumpInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a LOOKUPSWITCH instruction.
      覆盖:
      visitLookupSwitchInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a TABLESWITCH instruction.
      覆盖:
      visitTableSwitchInsn 在类中 MethodVisitor
      参数:
      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)
      从类复制的说明: MethodVisitor
      Visits a try catch block.
      覆盖:
      visitTryCatchBlock 在类中 MethodVisitor
      参数:
      start - the beginning of the exception handler's scope (inclusive).
      end - the end of the exception handler's scope (exclusive).
      handler - the beginning of the exception handler's code.
      type - the internal name of the type of exceptions handled by the handler, or null to catch any exceptions (for "finally" blocks).

    • onMethodEnter

      protected void onMethodEnter()
      Generates the "before" advice for the visited method. The default implementation of this method does nothing. Subclasses can use or change all the local variables, but should not change state of the stack. This method is called at the beginning of the method or after super class constructor has been called (in constructors).

    • onMethodExit

      protected void onMethodExit(int opcode)
      Generates the "after" advice for the visited method. The default implementation of this method does nothing. Subclasses can use or change all the local variables, but should not change state of the stack. This method is called at the end of the method, just before return and athrow instructions. The top element on the stack contains the return value or the exception instance. For example: 
       public void onMethodExit(final 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(final Object exitValue, final int opcode) {
   ...
 }
      参数:
      opcode - one of Opcodes.RETURN, Opcodes.IRETURN, Opcodes.FRETURN, Opcodes.ARETURN, Opcodes.LRETURN, Opcodes.DRETURN or Opcodes.ATHROW.