Class BasicInterpreter

    • Field Detail

      • NULL_TYPE

        public static final Type NULL_TYPE
        Special type used for the null literal. This is an object reference type with descriptor 'Lnull;'.
    • Method Detail

      • 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 occurred 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 occurred 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 occurred 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 occurred 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 occurred during the interpretation.
      • naryOperation

        public BasicValue naryOperation​(AbstractInsnNode insn,
                                        java.util.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 occurred 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 occurred during the interpretation.
      • merge

        public BasicValue merge​(BasicValue value1,
                                BasicValue value2)
        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:
        value1 - a value.
        value2 - another value.
        Returns:
        the merged value. If the merged value is equal to value1, this method must return value1.