asm-analysis 9.6 · org.objectweb.asm.tree.analysis.Interpreter

Modifier and Type	Field and Description
protected final int	api The ASM API version supported by this interpreter.

Access	Constructor and Description
protected	Interpreter(final int the ASM API version supported by this interpreter. Must be one of the `ASM`x values in `Opcodes`. api) Constructs a new `Interpreter`.

Method Summary

Modifier and Type	Method and Description
public abstract V	Returns: the result of the interpretation of the given instruction. binaryOperation(AbstractInsnNode the bytecode instruction to be interpreted. insn, V the first argument of the instruction to be interpreted. value1, V the second argument of the instruction to be interpreted. value2) Interprets a bytecode instruction with two arguments.
public abstract V	Returns: the result of the interpretation of the given instruction. The returned value must be `equal` to the given value. copyOperation(AbstractInsnNode the bytecode instruction to be interpreted. insn, V the value that must be moved by the instruction. value) Interprets a bytecode instruction that moves a value on the stack or to or from local variables.
public abstract V	Returns: the merged value. If the merged value is equal to `value1`, this method must return `value1`. merge(V a value. value1, V another value. value2) Merges two values.
public abstract V	Returns: the result of the interpretation of the given instruction. naryOperation(AbstractInsnNode the bytecode instruction to be interpreted. insn, List<? extends V> the arguments of the instruction to be interpreted. values) Interprets a bytecode instruction with a variable number of arguments.
public V	Returns: a value representing an uninitialized value. The size of the returned value must be equal to 1. newEmptyValue(final int the local variable index. local) Creates a new uninitialized value for a local variable.
public V	Returns: a value that represents the given `exceptionType`. The size of the returned value must be equal to 1. newExceptionValue(final TryCatchBlockNode the exception handler. tryCatchBlockNode, final Frame<V> the exception handler frame. handlerFrame, final Type the exception type handled by this handler. exceptionType) Creates a new value that represents the given exception type.
public abstract V	Returns: the result of the interpretation of the given instruction. newOperation(AbstractInsnNode the bytecode instruction to be interpreted. insn) Interprets a bytecode instruction without arguments.
public V	Returns: a value that represents the given type. The size of the returned value must be equal to the size of the given type. newParameterValue(final boolean true if the method is non-static. isInstanceMethod, final int the local variable index. local, final Type a primitive or reference type. type) Creates a new value that represents the given parameter type.
public V	Returns: a value that represents the given type. The size of the returned value must be equal to the size of the given type. newReturnTypeValue(final Type a primitive or reference type. type) Creates a new value that represents the given return type.
public abstract V	Returns: a value that represents the given type. The size of the returned value must be equal to the size of the given type. newValue(Type a primitive or reference type, or null to represent an uninitialized value. type) Creates a new value that represents the given type.
public abstract void	returnOperation(AbstractInsnNode the bytecode instruction to be interpreted. insn, V the argument of the instruction to be interpreted. value, V the expected return type of the analyzed method. expected) Interprets a bytecode return instruction.
public abstract V	Returns: the result of the interpretation of the given instruction. ternaryOperation(AbstractInsnNode the bytecode instruction to be interpreted. insn, V the first argument of the instruction to be interpreted. value1, V the second argument of the instruction to be interpreted. value2, V the third argument of the instruction to be interpreted. value3) Interprets a bytecode instruction with three arguments.
public abstract V	Returns: the result of the interpretation of the given instruction. unaryOperation(AbstractInsnNode the bytecode instruction to be interpreted. insn, V the argument of the instruction to be interpreted. value) Interprets a bytecode instruction with a single argument.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

api	back to summary
protected final int api The ASM API version supported by this interpreter. The value of this field must be one of the `ASM`x values in `Opcodes`.

Interpreter	back to summary
protected Interpreter(final int api) Constructs a new `Interpreter`. Parameters api:int the ASM API version supported by this interpreter. Must be one of the `ASM`x values in `Opcodes`.

Method Detail

binaryOperation	back to summary
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 Parameters insn:AbstractInsnNode the bytecode instruction to be interpreted. value1:V the first argument of the instruction to be interpreted. value2:V the second argument of the instruction to be interpreted. Returns:V the result of the interpretation of the given instruction. Exceptions AnalyzerException: if an error occurred during the interpretation.

binaryOperation

back to summary

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

Parameters

insn:AbstractInsnNode: the bytecode instruction to be interpreted.
value1:V: the first argument of the instruction to be interpreted.
value2:V: the second argument of the instruction to be interpreted.

Returns:V

the result of the interpretation of the given instruction.

Exceptions

AnalyzerException:: if an error occurred during the interpretation.

copyOperation back to summary

copyOperation	back to summary
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 Parameters insn:AbstractInsnNode the bytecode instruction to be interpreted. value:V the value that must be moved by the instruction. Returns:V the result of the interpretation of the given instruction. The returned value must be `equal` to the given value. Exceptions AnalyzerException: if an error occurred during the interpretation.

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

Parameters

insn:AbstractInsnNode: the bytecode instruction to be interpreted.
value:V: the value that must be moved by the instruction.

Returns:V

the result of the interpretation of the given instruction. The returned value must be equal to the given value.

Exceptions

AnalyzerException:: if an error occurred during the interpretation.

merge back to summary

merge	back to summary
public abstract V merge(V value1, V value2) 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 value1:V a value. value2:V another value. Returns:V the merged value. If the merged value is equal to `value1`, this method must return `value1`.

public abstract V merge(V value1, V value2)

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

value1:V: a value.
value2:V: another value.

Returns:V

the merged value. If the merged value is equal to value1, this method must return value1.

naryOperation	back to summary
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 Parameters insn:AbstractInsnNode the bytecode instruction to be interpreted. values:List<? extends V> the arguments of the instruction to be interpreted. Returns:V the result of the interpretation of the given instruction. Exceptions AnalyzerException: if an error occurred during the interpretation.

naryOperation

back to summary

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

Parameters

insn:AbstractInsnNode: the bytecode instruction to be interpreted.
values:List<? extends V>: the arguments of the instruction to be interpreted.

Returns:V

the result of the interpretation of the given instruction.

Exceptions

AnalyzerException:: if an error occurred during the interpretation.

newEmptyValue back to summary

newEmptyValue	back to summary
public V newEmptyValue(final int local) Creates a new uninitialized value for a local variable. This method is called to initialize the value of a local that does not correspond to a method parameter, and to reset one half of a size-2 value when the other half is assigned a size-1 value. By default, calls `newValue(null)`. Parameters local:int the local variable index. Returns:V a value representing an uninitialized value. The size of the returned value must be equal to 1.

public V newEmptyValue(final int local)

Creates a new uninitialized value for a local variable. This method is called to initialize the value of a local that does not correspond to a method parameter, and to reset one half of a size-2 value when the other half is assigned a size-1 value.

By default, calls newValue(null).

Parameters

local:int: the local variable index.

Returns:V

a value representing an uninitialized value. The size of the returned value must be equal to 1.

newExceptionValue back to summary

newExceptionValue	back to summary
public V newExceptionValue(final TryCatchBlockNode tryCatchBlockNode, final Frame<V> handlerFrame, final Type exceptionType) Creates a new value that represents the given exception type. This method is called to initialize the exception value on the call stack at the entry of an exception handler. By default, calls `newValue(exceptionType)`. Parameters tryCatchBlockNode:TryCatchBlockNode the exception handler. handlerFrame:Frame<V> the exception handler frame. exceptionType:Type the exception type handled by this handler. Returns:V a value that represents the given `exceptionType`. The size of the returned value must be equal to 1.

public V newExceptionValue(final TryCatchBlockNode tryCatchBlockNode, final Frame<V> handlerFrame, final Type exceptionType)

Creates a new value that represents the given exception type. This method is called to initialize the exception value on the call stack at the entry of an exception handler.

By default, calls newValue(exceptionType).

Parameters

tryCatchBlockNode:TryCatchBlockNode: the exception handler.
handlerFrame:Frame<V>: the exception handler frame.
exceptionType:Type: the exception type handled by this handler.

Returns:V

a value that represents the given exceptionType. The size of the returned value must be equal to 1.

newOperation	back to summary
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 Parameters insn:AbstractInsnNode the bytecode instruction to be interpreted. Returns:V the result of the interpretation of the given instruction. Exceptions AnalyzerException: if an error occurred during the interpretation.

newOperation

back to summary

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

Parameters

insn:AbstractInsnNode: the bytecode instruction to be interpreted.

Returns:V

the result of the interpretation of the given instruction.

Exceptions

AnalyzerException:: if an error occurred during the interpretation.

newParameterValue back to summary

newParameterValue	back to summary
public V newParameterValue(final boolean isInstanceMethod, final int local, final Type type) Creates a new value that represents the given parameter type. This method is called to initialize the value of a local corresponding to a method parameter in a frame. By default, calls `newValue(type)`. Parameters isInstanceMethod:boolean true if the method is non-static. local:int the local variable index. type:Type a primitive or reference type. Returns:V a value that represents the given type. The size of the returned value must be equal to the size of the given type.

public V newParameterValue(final boolean isInstanceMethod, final int local, final Type type)

Creates a new value that represents the given parameter type. This method is called to initialize the value of a local corresponding to a method parameter in a frame.

By default, calls newValue(type).

Parameters

isInstanceMethod:boolean: true if the method is non-static.
local:int: the local variable index.
type:Type: a primitive or reference type.

Returns:V

a value that represents the given type. The size of the returned value must be equal to the size of the given type.

newReturnTypeValue back to summary

newReturnTypeValue	back to summary
public V newReturnTypeValue(final Type type) Creates a new value that represents the given return type. This method is called to initialize the return type value of a frame. By default, calls `newValue(type)`. Parameters type:Type a primitive or reference type. Returns:V a value that represents the given type. The size of the returned value must be equal to the size of the given type.

public V newReturnTypeValue(final Type type)

Creates a new value that represents the given return type. This method is called to initialize the return type value of a frame.

By default, calls newValue(type).

Parameters

type:Type: a primitive or reference type.

Returns:V

a value that represents the given type. The size of the returned value must be equal to the size of the given type.

newValue back to summary

newValue	back to summary
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. An interpreter may choose to implement one or more of `Interpreter#newReturnTypeValue(Type)`, `Interpreter#newParameterValue(boolean, int, Type)`, `Interpreter#newEmptyValue(int)`, `Interpreter#newExceptionValue(TryCatchBlockNode, Frame, Type)` to distinguish different types of new value. Parameters type:Type a primitive or reference type, or null to represent an uninitialized value. Returns:V a value that represents the given type. The size of the returned value must be equal to the size of the given type.

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.

An interpreter may choose to implement one or more of Interpreter#newReturnTypeValue(Type), Interpreter#newParameterValue(boolean, int, Type), Interpreter#newEmptyValue(int), Interpreter#newExceptionValue(TryCatchBlockNode, Frame, Type) to distinguish different types of new value.

Parameters

type:Type: a primitive or reference type, or null to represent an uninitialized value.

Returns:V

a value that represents the given type. The size of the returned value must be equal to the size of the given type.

returnOperation	back to summary
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 Parameters insn:AbstractInsnNode the bytecode instruction to be interpreted. value:V the argument of the instruction to be interpreted. expected:V the expected return type of the analyzed method. Exceptions AnalyzerException: if an error occurred during the interpretation.

returnOperation

back to summary

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

Parameters

insn:AbstractInsnNode: the bytecode instruction to be interpreted.
value:V: the argument of the instruction to be interpreted.
expected:V: the expected return type of the analyzed method.

Exceptions

AnalyzerException:: if an error occurred during the interpretation.

ternaryOperation	back to summary
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 Parameters insn:AbstractInsnNode the bytecode instruction to be interpreted. value1:V the first argument of the instruction to be interpreted. value2:V the second argument of the instruction to be interpreted. value3:V the third argument of the instruction to be interpreted. Returns:V the result of the interpretation of the given instruction. Exceptions AnalyzerException: if an error occurred during the interpretation.

ternaryOperation

back to summary

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

Parameters

insn:AbstractInsnNode: the bytecode instruction to be interpreted.
value1:V: the first argument of the instruction to be interpreted.
value2:V: the second argument of the instruction to be interpreted.
value3:V: the third argument of the instruction to be interpreted.

Returns:V

the result of the interpretation of the given instruction.

Exceptions

AnalyzerException:: if an error occurred during the interpretation.

unaryOperation	back to summary
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 Parameters insn:AbstractInsnNode the bytecode instruction to be interpreted. value:V the argument of the instruction to be interpreted. Returns:V the result of the interpretation of the given instruction. Exceptions AnalyzerException: if an error occurred during the interpretation.

unaryOperation

back to summary

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

Parameters

insn:AbstractInsnNode: the bytecode instruction to be interpreted.
value:V: the argument of the instruction to be interpreted.

Returns:V

the result of the interpretation of the given instruction.

Exceptions

AnalyzerException:: if an error occurred during the interpretation.

public abstract Class Interpreter<V extends org.objectweb.asm.tree.analysis.Value>

Field Summary

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Field Detail

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Method Detail