org.objectweb.asm.tree.analysis

## Class BasicInterpreter

- java.lang.Object
- - org.objectweb.asm.tree.analysis.Interpreter<BasicValue>
  - - org.objectweb.asm.tree.analysis.BasicInterpreter

- All Implemented Interfaces:
    Opcodes
  Direct Known Subclasses:
    BasicVerifier

      public class BasicInterpreter
      extends Interpreter<BasicValue>
      implements Opcodes

  An `Interpreter` for `BasicValue` values.
  Author:
    Eric Bruneton, Bing Ran

- - ### Field Summary

    - ### Fields inherited from class org.objectweb.asm.tree.analysis.Interpreter

      `api`

    - ### Fields inherited from interface org.objectweb.asm.Opcodes

      `AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, 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, ASM5, 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, V1_8`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `` | `BasicInterpreter()`
    `protected` | `BasicInterpreter(int api)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `BasicValue` | `binaryOperation(AbstractInsnNode insn, BasicValue value1, BasicValue value2)` Interprets a bytecode instruction with two arguments.
    `BasicValue` | `copyOperation(AbstractInsnNode insn, BasicValue value)` Interprets a bytecode instruction that moves a value on the stack or to or from local variables.
    `BasicValue` | `merge(BasicValue v, BasicValue w)` Merges two values.
    `BasicValue` | `naryOperation(AbstractInsnNode insn, List<? extends BasicValue> values)` Interprets a bytecode instruction with a variable number of arguments.
    `BasicValue` | `newOperation(AbstractInsnNode insn)` Interprets a bytecode instruction without arguments.
    `BasicValue` | `newValue(Type type)` Creates a new value that represents the given type.
    `void` | `returnOperation(AbstractInsnNode insn, BasicValue value, BasicValue expected)` Interprets a bytecode return instruction.
    `BasicValue` | `ternaryOperation(AbstractInsnNode insn, BasicValue value1, BasicValue value2, BasicValue value3)` Interprets a bytecode instruction with three arguments.
    `BasicValue` | `unaryOperation(AbstractInsnNode insn, BasicValue value)` Interprets a bytecode instruction with a single argument.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### BasicInterpreter

          public BasicInterpreter()

    - #### BasicInterpreter

          protected BasicInterpreter(int api)

  - ### Method Detail

    - #### newValue

          public BasicValue newValue(Type type)

      Description copied from class: `Interpreter`
      Creates a new value that represents the given type. Called for method parameters (including `this`), exception handler variable and with `null` type for variables reserved by long and double types.
      Specified by:
        `newValue` in class `Interpreter<BasicValue>`
      Parameters:
        `type` - a primitive or reference type, or `null` to represent an uninitialized value.
      Returns:
        a value that represents the given type. The size of the returned value must be equal to the size of the given type.

    - #### newOperation

          public BasicValue newOperation(AbstractInsnNode insn)
                                  throws AnalyzerException

      Description copied from class: `Interpreter`
      Interprets a bytecode instruction without arguments. This method is called for the following opcodes: 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, BIPUSH, SIPUSH, LDC, JSR, GETSTATIC, NEW
      Specified by:
        `newOperation` in class `Interpreter<BasicValue>`
      Parameters:
        `insn` - the bytecode instruction to be interpreted.
      Returns:
        the result of the interpretation of the given instruction.
      Throws:
        `AnalyzerException` - if an error occured during the interpretation.

    - #### copyOperation

          public BasicValue copyOperation(AbstractInsnNode insn,
                                          BasicValue value)
                                   throws AnalyzerException

      Description copied from class: `Interpreter`
      Interprets a bytecode instruction that moves a value on the stack or to or from local variables. This method is called for the following opcodes: ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, SWAP
      Specified by:
        `copyOperation` in class `Interpreter<BasicValue>`
      Parameters:
        `insn` - the bytecode instruction to be interpreted.
        `value` - the value that must be moved by the instruction.
      Returns:
        the result of the interpretation of the given instruction. The returned value must be `equal` to the given value.
      Throws:
        `AnalyzerException` - if an error occured during the interpretation.

    - #### unaryOperation

          public BasicValue unaryOperation(AbstractInsnNode insn,
                                           BasicValue value)
                                    throws AnalyzerException

      Description copied from class: `Interpreter`
      Interprets a bytecode instruction with a single argument. This method is called for the following opcodes: INEG, LNEG, FNEG, DNEG, IINC, I2L, I2F, I2D, L2I, L2F, L2D, F2I, F2L, F2D, D2I, D2L, D2F, I2B, I2C, I2S, IFEQ, IFNE, IFLT, IFGE, IFGT, IFLE, TABLESWITCH, LOOKUPSWITCH, IRETURN, LRETURN, FRETURN, DRETURN, ARETURN, PUTSTATIC, GETFIELD, NEWARRAY, ANEWARRAY, ARRAYLENGTH, ATHROW, CHECKCAST, INSTANCEOF, MONITORENTER, MONITOREXIT, IFNULL, IFNONNULL
      Specified by:
        `unaryOperation` in class `Interpreter<BasicValue>`
      Parameters:
        `insn` - the bytecode instruction to be interpreted.
        `value` - the argument of the instruction to be interpreted.
      Returns:
        the result of the interpretation of the given instruction.
      Throws:
        `AnalyzerException` - if an error occured during the interpretation.

    - #### binaryOperation

          public BasicValue binaryOperation(AbstractInsnNode insn,
                                            BasicValue value1,
                                            BasicValue value2)
                                     throws AnalyzerException

      Description copied from class: `Interpreter`
      Interprets a bytecode instruction with two arguments. This method is called for the following opcodes: IALOAD, LALOAD, FALOAD, DALOAD, AALOAD, BALOAD, CALOAD, SALOAD, IADD, LADD, FADD, DADD, ISUB, LSUB, FSUB, DSUB, IMUL, LMUL, FMUL, DMUL, IDIV, LDIV, FDIV, DDIV, IREM, LREM, FREM, DREM, ISHL, LSHL, ISHR, LSHR, IUSHR, LUSHR, IAND, LAND, IOR, LOR, IXOR, LXOR, LCMP, FCMPL, FCMPG, DCMPL, DCMPG, IF_ICMPEQ, IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ, IF_ACMPNE, PUTFIELD
      Specified by:
        `binaryOperation` in class `Interpreter<BasicValue>`
      Parameters:
        `insn` - the bytecode instruction to be interpreted.
        `value1` - the first argument of the instruction to be interpreted.
        `value2` - the second argument of the instruction to be interpreted.
      Returns:
        the result of the interpretation of the given instruction.
      Throws:
        `AnalyzerException` - if an error occured during the interpretation.

    - #### ternaryOperation

          public BasicValue ternaryOperation(AbstractInsnNode insn,
                                             BasicValue value1,
                                             BasicValue value2,
                                             BasicValue value3)
                                      throws AnalyzerException

      Description copied from class: `Interpreter`
      Interprets a bytecode instruction with three arguments. This method is called for the following opcodes: IASTORE, LASTORE, FASTORE, DASTORE, AASTORE, BASTORE, CASTORE, SASTORE
      Specified by:
        `ternaryOperation` in class `Interpreter<BasicValue>`
      Parameters:
        `insn` - the bytecode instruction to be interpreted.
        `value1` - the first argument of the instruction to be interpreted.
        `value2` - the second argument of the instruction to be interpreted.
        `value3` - the third argument of the instruction to be interpreted.
      Returns:
        the result of the interpretation of the given instruction.
      Throws:
        `AnalyzerException` - if an error occured during the interpretation.

    - #### naryOperation

          public BasicValue naryOperation(AbstractInsnNode insn,
                                          List<? extends BasicValue> values)
                                   throws AnalyzerException

      Description copied from class: `Interpreter`
      Interprets a bytecode instruction with a variable number of arguments. This method is called for the following opcodes: INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC, INVOKEINTERFACE, MULTIANEWARRAY and INVOKEDYNAMIC
      Specified by:
        `naryOperation` in class `Interpreter<BasicValue>`
      Parameters:
        `insn` - the bytecode instruction to be interpreted.
        `values` - the arguments of the instruction to be interpreted.
      Returns:
        the result of the interpretation of the given instruction.
      Throws:
        `AnalyzerException` - if an error occured during the interpretation.

    - #### returnOperation

          public void returnOperation(AbstractInsnNode insn,
                                      BasicValue value,
                                      BasicValue expected)
                               throws AnalyzerException

      Description copied from class: `Interpreter`
      Interprets a bytecode return instruction. This method is called for the following opcodes: IRETURN, LRETURN, FRETURN, DRETURN, ARETURN
      Specified by:
        `returnOperation` in class `Interpreter<BasicValue>`
      Parameters:
        `insn` - the bytecode instruction to be interpreted.
        `value` - the argument of the instruction to be interpreted.
        `expected` - the expected return type of the analyzed method.
      Throws:
        `AnalyzerException` - if an error occured during the interpretation.

    - #### merge

          public BasicValue merge(BasicValue v,
                                  BasicValue w)

      Description copied from class: `Interpreter`
      Merges two values. The merge operation must return a value that represents both values (for instance, if the two values are two types, the merged value must be a common super type of the two types. If the two values are integer intervals, the merged value must be an interval that contains the previous ones. Likewise for other types of values).
      Specified by:
        `merge` in class `Interpreter<BasicValue>`
      Parameters:
        `v` - a value.
        `w` - another value.
      Returns:
        the merged value. If the merged value is equal to `v`, this method must return `v`.