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public interface Interpreter
Analyzer
to work with
various semantic interpreters, without needing to duplicate the code to
simulate the transfer of values.
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public Value binaryOperation(AbstractInsnNode insn, Value value1, Value 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
- 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.
public Value copyOperation(AbstractInsnNode insn, Value 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
- 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.
public Value merge(Value v, Value 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).
- Parameters:
v
- a value.w
- another value.
- Returns:
- the merged value. If the merged value is equal to v, this method must return v.
public Value naryOperation(AbstractInsnNode insn, List 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
- 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.
public Value 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
- 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.
public Value newValue(Type type)
Creates a new value that represents the given type.
- 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.
public Value ternaryOperation(AbstractInsnNode insn, Value value1, Value value2, Value 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
- 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.
public Value unaryOperation(AbstractInsnNode insn, Value 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
- 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.