程序包 org.beetl.ow2.asm.tree.analysis

类 Interpreter<V extends Value>

java.lang.Object
org.beetl.ow2.asm.tree.analysis.Interpreter<V>
类型参数:
V - type of the Value used for the analysis.
直接已知子类:
BasicInterpreter, SourceInterpreter
public abstract class Interpreter<V extends Value> extends Object
A semantic bytecode interpreter. More precisely, this interpreter only manages the computation of values from other values: it does not manage the transfer of values to or from the stack, and to or from the local variables. This separation allows a generic bytecode Analyzer to work with various semantic interpreters, without needing to duplicate the code to simulate the transfer of values.
作者:
Eric Bruneton

  • 字段详细资料

    • api

      protected final int api

  • 构造器详细资料

    • Interpreter

      protected Interpreter(int api)

  • 方法详细资料

    • newValue

      public abstract V newValue(Type type)
      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.
      参数:
      type - a primitive or reference type, or null to represent an uninitialized value.
      返回:
      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 abstract V newOperation(AbstractInsnNode insn) throws AnalyzerException
      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
      参数:
      insn - the bytecode instruction to be interpreted.
      返回:
      the result of the interpretation of the given instruction.
      抛出:
      AnalyzerException - if an error occured during the interpretation.

    • copyOperation

      public abstract V copyOperation(AbstractInsnNode insn, V value) throws AnalyzerException
      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
      参数:
      insn - the bytecode instruction to be interpreted.
      value - the value that must be moved by the instruction.
      返回:
      the result of the interpretation of the given instruction. The returned value must be equal to the given value.
      抛出:
      AnalyzerException - if an error occured during the interpretation.

    • unaryOperation

      public abstract V unaryOperation(AbstractInsnNode insn, V value) throws AnalyzerException
      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
      参数:
      insn - the bytecode instruction to be interpreted.
      value - the argument of the instruction to be interpreted.
      返回:
      the result of the interpretation of the given instruction.
      抛出:
      AnalyzerException - if an error occured during the interpretation.

    • binaryOperation

      public abstract V binaryOperation(AbstractInsnNode insn, V value1, V value2) throws AnalyzerException
      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
      参数:
      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.
      返回:
      the result of the interpretation of the given instruction.
      抛出:
      AnalyzerException - if an error occured during the interpretation.

    • ternaryOperation

      public abstract V ternaryOperation(AbstractInsnNode insn, V value1, V value2, V value3) throws AnalyzerException
      Interprets a bytecode instruction with three arguments. This method is called for the following opcodes: IASTORE, LASTORE, FASTORE, DASTORE, AASTORE, BASTORE, CASTORE, SASTORE
      参数:
      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.
      返回:
      the result of the interpretation of the given instruction.
      抛出:
      AnalyzerException - if an error occured during the interpretation.

    • naryOperation

      public abstract V naryOperation(AbstractInsnNode insn, List<? extends V> values) throws AnalyzerException
      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
      参数:
      insn - the bytecode instruction to be interpreted.
      values - the arguments of the instruction to be interpreted.
      返回:
      the result of the interpretation of the given instruction.
      抛出:
      AnalyzerException - if an error occured during the interpretation.

    • returnOperation

      public abstract void returnOperation(AbstractInsnNode insn, V value, V expected) throws AnalyzerException
      Interprets a bytecode return instruction. This method is called for the following opcodes: IRETURN, LRETURN, FRETURN, DRETURN, ARETURN
      参数:
      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.
      抛出:
      AnalyzerException - if an error occured during the interpretation.

    • merge

      public abstract V merge(V v, V w)
      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).
      参数:
      v - a value.
      w - another value.
      返回:
      the merged value. If the merged value is equal to v, this method must return v.