content: /***
   * ASM: a very small and fast Java bytecode manipulation framework
   * Copyright (c) 2000-2007 INRIA, France Telecom
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the copyright holders nor the names of its
   *    contributors may be used to endorse or promote products derived from
   *    this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  package com.alibaba.fastjson.asm;
  
  /**
   * A visitor to visit a Java method. The methods of this interface must be called in the following order: [
   * <tt>visitAnnotationDefault</tt> ] ( <tt>visitAnnotation</tt> | <tt>visitParameterAnnotation</tt> |
   * <tt>visitAttribute</tt> )* [ <tt>visitCode</tt> ( <tt>visitFrame</tt> | <tt>visit</tt><i>X</i>Insn</tt> |
   * <tt>visitLabel</tt> | <tt>visitTryCatchBlock</tt> | <tt>visitLocalVariable</tt> | <tt>visitLineNumber</tt>)*
   * <tt>visitMaxs</tt> ] <tt>visitEnd</tt>. In addition, the <tt>visit</tt><i>X</i>Insn</tt> and <tt>visitLabel</tt>
   * methods must be called in the sequential order of the bytecode instructions of the visited code,
   * <tt>visitTryCatchBlock</tt> must be called <i>before</i> the labels passed as arguments have been visited, and the
   * <tt>visitLocalVariable</tt> and <tt>visitLineNumber</tt> methods must be called <i>after</i> the labels passed as
   * arguments have been visited.
   * 
   * @author Eric Bruneton
   */
  public interface MethodVisitor {
  
      // -------------------------------------------------------------------------
      // Annotations and non standard attributes
      // -------------------------------------------------------------------------
  
      // -------------------------------------------------------------------------
      // Normal instructions
      // -------------------------------------------------------------------------
  
      /**
       * Visits a zero operand instruction.
       * 
       * @param 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.
       */
      void visitInsn(int opcode);
  
      /**
       * Visits an instruction with a single int operand.
       * 
       * @param opcode the opcode of the instruction to be visited. This opcode is either BIPUSH, SIPUSH or NEWARRAY.
       * @param operand the operand of the instruction to be visited.<br>
       * When opcode is BIPUSH, operand value should be between Byte.MIN_VALUE and Byte.MAX_VALUE.<br>
       * When opcode is SIPUSH, operand value should be between Short.MIN_VALUE and Short.MAX_VALUE.<br>
       * When opcode is NEWARRAY, operand value should be one of {@link Opcodes#T_BOOLEAN}, {@link Opcodes#T_CHAR},
       * {@link Opcodes#T_FLOAT}, {@link Opcodes#T_DOUBLE}, {@link Opcodes#T_BYTE}, {@link Opcodes#T_SHORT},
       * {@link Opcodes#T_INT} or {@link Opcodes#T_LONG}.
       */
      void visitIntInsn(int opcode, int operand);
  
      /**
       * Visits a local variable instruction. A local variable instruction is an instruction that loads or stores the
       * value of a local variable.
       * 
       * @param 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.
       * @param var the operand of the instruction to be visited. This operand is the index of a local variable.
       */
      void visitVarInsn(int opcode, int var);
  
      /**
       * Visits a type instruction. A type instruction is an instruction that takes the internal name of a class as
       * parameter.
       * 
       * @param opcode the opcode of the type instruction to be visited. This opcode is either NEW, ANEWARRAY, CHECKCAST
       * or INSTANCEOF.
       * @param type the operand of the instruction to be visited. This operand must be the internal name of an object or
       * array class (see {@link Type#getInternalName() getInternalName}).
       */
      void visitTypeInsn(int opcode, String type);
  
      /**
       * Visits a field instruction. A field instruction is an instruction that loads or stores the value of a field of an
       * object.
       * 
       * @param opcode the opcode of the type instruction to be visited. This opcode is either GETSTATIC, PUTSTATIC,
       * GETFIELD or PUTFIELD.
       * @param owner the internal name of the field's owner class (see {@link Type#getInternalName() getInternalName}).
       * @param name the field's name.
       * @param desc the field's descriptor (see {@link Type Type}).
       */
      void visitFieldInsn(int opcode, String owner, String name, String desc);
  
      /**
       * Visits a method instruction. A method instruction is an instruction that invokes a method.
       * 
       * @param opcode the opcode of the type instruction to be visited. This opcode is either INVOKEVIRTUAL,
       * INVOKESPECIAL, INVOKESTATIC, INVOKEINTERFACE or INVOKEDYNAMIC.
       * @param owner the internal name of the method's owner class (see {@link Type#getInternalName() getInternalName})
       * or {@link com.alibaba.fastjson.asm.Opcodes#INVOKEDYNAMIC_OWNER}.
       * @param name the method's name.
       * @param desc the method's descriptor (see {@link Type Type}).
       */
      void visitMethodInsn(int opcode, String owner, String name, String desc);
  
      /**
       * Visits a jump instruction. A jump instruction is an instruction that may jump to another instruction.
       * 
       * @param 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.
       * @param 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.
       */
      void visitJumpInsn(int opcode, Label label);
  
      /**
       * Visits a label. A label designates the instruction that will be visited just after it.
       * 
       * @param label a {@link Label Label} object.
       */
      void visitLabel(Label label);
  
      // -------------------------------------------------------------------------
      // Special instructions
      // -------------------------------------------------------------------------
  
      /**
       * Visits a LDC instruction.
       * 
       * @param cst the constant to be loaded on the stack. This parameter must be a non null {@link Integer}, a
       * {@link Float}, a {@link Long}, a {@link Double} a {@link String} (or a {@link Type} for <tt>.class</tt>
       * constants, for classes whose version is 49.0 or more).
       */
      void visitLdcInsn(Object cst);
  
      /**
       * Visits an IINC instruction.
       * 
       * @param var index of the local variable to be incremented.
       * @param increment amount to increment the local variable by.
       */
      void visitIincInsn(int var, int increment);
  
      // -------------------------------------------------------------------------
      // Exceptions table entries, debug information, max stack and max locals
      // -------------------------------------------------------------------------
  
      /**
       * Visits the maximum stack size and the maximum number of local variables of the method.
       * 
       * @param maxStack maximum stack size of the method.
       * @param maxLocals maximum number of local variables for the method.
       */
      void visitMaxs(int maxStack, int maxLocals);
  
      /**
       * Visits the end of the method. This method, which is the last one to be called, is used to inform the visitor that
       * all the annotations and attributes of the method have been visited.
       */
      void visitEnd();
  }
  