Class BasicInterpreter

    • 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,
                                        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 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.