Package org.objectweb.asm.tree.analysis

Class SimpleVerifier

java.lang.Object

org.objectweb.asm.tree.analysis.Interpreter<BasicValue>

org.objectweb.asm.tree.analysis.BasicInterpreter

org.objectweb.asm.tree.analysis.BasicVerifier

org.objectweb.asm.tree.analysis.SimpleVerifier

All Implemented Interfaces:

org.objectweb.asm.Opcodes

public class SimpleVerifier
extends BasicVerifier

An extended BasicVerifier that performs more precise verifications. This verifier computes exact class types, instead of using a single "object reference" type (as done in BasicVerifier).

Field Summary

Fields inherited from class org.objectweb.asm.tree.analysis.BasicInterpreter

NULL_TYPE

Fields inherited from class org.objectweb.asm.tree.analysis.Interpreter

api

Fields inherited from interface org.objectweb.asm.Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_MODULE, ACC_NATIVE, ACC_OPEN, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_RECORD, ACC_STATIC, ACC_STATIC_PHASE, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_TRANSITIVE, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM10_EXPERIMENTAL, ASM4, ASM5, ASM6, ASM7, ASM8, ASM9, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V_PREVIEW, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21, V9

Constructor Summary

Constructors

Modifier	Constructor	Description
	SimpleVerifier()	Constructs a new SimpleVerifier.
protected	SimpleVerifier(int api, org.objectweb.asm.Type currentClass, org.objectweb.asm.Type currentSuperClass, List<org.objectweb.asm.Type> currentClassInterfaces, boolean isInterface)	Constructs a new SimpleVerifier to verify a specific class.
	SimpleVerifier(org.objectweb.asm.Type currentClass, org.objectweb.asm.Type currentSuperClass, boolean isInterface)	Constructs a new SimpleVerifier to verify a specific class.
	SimpleVerifier(org.objectweb.asm.Type currentClass, org.objectweb.asm.Type currentSuperClass, List<org.objectweb.asm.Type> currentClassInterfaces, boolean isInterface)	Constructs a new SimpleVerifier to verify a specific class.

Method Summary

Modifier and Type	Method	Description
protected Class<?>	getClass(org.objectweb.asm.Type type)	Loads the class corresponding to the given type.
protected BasicValue	getElementValue(BasicValue objectArrayValue)	Returns the value corresponding to the type of the elements of the given array reference value.
protected org.objectweb.asm.Type	getSuperClass(org.objectweb.asm.Type type)	Returns the type corresponding to the super class of the given type.
protected boolean	isArrayValue(BasicValue value)	Returns whether the given value corresponds to an array reference.
protected boolean	isAssignableFrom(org.objectweb.asm.Type type1, org.objectweb.asm.Type type2)	Returns whether the class corresponding to the first argument is either the same as, or is a superclass or superinterface of the class corresponding to the second argument.
protected boolean	isInterface(org.objectweb.asm.Type type)	Returns whether the given type corresponds to the type of an interface.
protected boolean	isSubTypeOf(BasicValue value, BasicValue expected)	Returns whether the type corresponding to the first argument is a subtype of the type corresponding to the second argument.
BasicValue	merge(BasicValue value1, BasicValue value2)	Merges two values.
BasicValue	newValue(org.objectweb.asm.Type type)	Creates a new value that represents the given type.
void	setClassLoader(ClassLoader loader)	Sets the ClassLoader to be used in getClass(org.objectweb.asm.Type).

Methods inherited from class org.objectweb.asm.tree.analysis.BasicVerifier

binaryOperation, copyOperation, naryOperation, returnOperation, ternaryOperation, unaryOperation

Methods inherited from class org.objectweb.asm.tree.analysis.BasicInterpreter

newOperation

Methods inherited from class org.objectweb.asm.tree.analysis.Interpreter

newEmptyValue, newExceptionValue, newParameterValue, newReturnTypeValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SimpleVerifier

public SimpleVerifier()

Constructs a new SimpleVerifier. Subclasses must not use this constructor. Instead, they must use the SimpleVerifier(int, Type, Type, List, boolean) version.

SimpleVerifier

public SimpleVerifier(org.objectweb.asm.Type currentClass,
 org.objectweb.asm.Type currentSuperClass,
 boolean isInterface)

Constructs a new SimpleVerifier to verify a specific class. This class will not be loaded into the JVM since it may be incorrect. Subclasses must not use this constructor. Instead, they must use the SimpleVerifier(int, Type, Type, List, boolean) version.

Parameters:

currentClass - the type of the class to be verified.

currentSuperClass - the type of the super class of the class to be verified.

isInterface - whether the class to be verifier is an interface.

SimpleVerifier

public SimpleVerifier(org.objectweb.asm.Type currentClass,
 org.objectweb.asm.Type currentSuperClass,
 List<org.objectweb.asm.Type> currentClassInterfaces,
 boolean isInterface)

Constructs a new SimpleVerifier to verify a specific class. This class will not be loaded into the JVM since it may be incorrect. Subclasses must not use this constructor. Instead, they must use the SimpleVerifier(int, Type, Type, List, boolean) version.

Parameters:

currentClass - the type of the class to be verified.

currentSuperClass - the type of the super class of the class to be verified.

currentClassInterfaces - the types of the interfaces directly implemented by the class to be verified.

isInterface - whether the class to be verifier is an interface.

SimpleVerifier

protected SimpleVerifier(int api,
 org.objectweb.asm.Type currentClass,
 org.objectweb.asm.Type currentSuperClass,
 List<org.objectweb.asm.Type> currentClassInterfaces,
 boolean isInterface)

Constructs a new SimpleVerifier to verify a specific class. This class will not be loaded into the JVM since it may be incorrect.

Parameters:

api - the ASM API version supported by this verifier. Must be one of the ASMx values in Opcodes.

currentClass - the type of the class to be verified.

currentSuperClass - the type of the super class of the class to be verified.

currentClassInterfaces - the types of the interfaces directly implemented by the class to be verified.

isInterface - whether the class to be verifier is an interface.

Method Details

setClassLoader

public void setClassLoader(ClassLoader loader)

Sets the ClassLoader to be used in getClass(org.objectweb.asm.Type).

Parameters:

loader - the ClassLoader to use.

newValue

public BasicValue newValue(org.objectweb.asm.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.

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.

Overrides:

newValue in class BasicInterpreter

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.

isArrayValue

protected boolean isArrayValue(BasicValue value)

Description copied from class: BasicVerifier

Returns whether the given value corresponds to an array reference.

Overrides:

isArrayValue in class BasicVerifier

Parameters:

value - a value.

Returns:

whether 'value' corresponds to an array reference.

getElementValue

protected BasicValue getElementValue(BasicValue objectArrayValue)
                              throws AnalyzerException

Description copied from class: BasicVerifier

Returns the value corresponding to the type of the elements of the given array reference value.

Overrides:

getElementValue in class BasicVerifier

Parameters:

objectArrayValue - a value corresponding to array of object (or array) references.

Returns:

the value corresponding to the type of the elements of 'objectArrayValue'.

Throws:

AnalyzerException - if objectArrayValue does not correspond to an array type.

isSubTypeOf

protected boolean isSubTypeOf(BasicValue value,
 BasicValue expected)

Description copied from class: BasicVerifier

Returns whether the type corresponding to the first argument is a subtype of the type corresponding to the second argument.

Overrides:

isSubTypeOf in class BasicVerifier

Parameters:

value - a value.

expected - another value.

Returns:

whether the type corresponding to 'value' is a subtype of the type corresponding to 'expected'.

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).

Overrides:

merge in class BasicInterpreter

Parameters:

value1 - a value.

value2 - another value.

Returns:

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

isInterface

protected boolean isInterface(org.objectweb.asm.Type type)

Returns whether the given type corresponds to the type of an interface. The default implementation of this method loads the class and uses the reflection API to return its result (unless the given type corresponds to the class being verified).

Parameters:

type - a type.

Returns:

whether 'type' corresponds to an interface.

getSuperClass

protected org.objectweb.asm.Type getSuperClass(org.objectweb.asm.Type type)

Returns the type corresponding to the super class of the given type. The default implementation of this method loads the class and uses the reflection API to return its result (unless the given type corresponds to the class being verified).

Parameters:

type - a type.

Returns:

the type corresponding to the super class of 'type'.

isAssignableFrom

protected boolean isAssignableFrom(org.objectweb.asm.Type type1,
 org.objectweb.asm.Type type2)

Returns whether the class corresponding to the first argument is either the same as, or is a superclass or superinterface of the class corresponding to the second argument. The default implementation of this method loads the classes and uses the reflection API to return its result (unless the result can be computed from the class being verified, and the types of its super classes and implemented interfaces).

Parameters:

type1 - a type.

type2 - another type.

Returns:

whether the class corresponding to 'type1' is either the same as, or is a superclass or superinterface of the class corresponding to 'type2'.

getClass

protected Class<?> getClass(org.objectweb.asm.Type type)

Loads the class corresponding to the given type. The class is loaded with the class loader specified with setClassLoader(java.lang.ClassLoader), or with the class loader of this class if no class loader was specified.

Parameters:

type - a type.

Returns:

the class corresponding to 'type'.