Class SimpleVerifier

java.lang.Object

org.objectweb.asm.tree.analysis.BasicInterpreter

org.objectweb.asm.tree.analysis.BasicVerifier

org.objectweb.asm.tree.analysis.SimpleVerifier

All Implemented Interfaces:

Opcodes, Interpreter

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 the BasicVerifier).

Author:

Eric Bruneton, Bing Ran

Field Summary

Fields inherited from interface Opcodes

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, 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, 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, INVOKEDYNAMIC_OWNER, 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, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7

Constructor Summary

Constructors

Constructor	Description
SimpleVerifier()	Constructs a new SimpleVerifier.
SimpleVerifier(Type currentClass, Type currentSuperClass, boolean isInterface)	Constructs a new SimpleVerifier to verify a specific class.
SimpleVerifier(Type currentClass, Type currentSuperClass, List currentClassInterfaces, boolean isInterface)	Constructs a new SimpleVerifier to verify a specific class.

Method Summary

Modifier and Type	Method	Description
protected Class	getClass(Type t)
protected Value	getElementValue(Value objectArrayValue)
protected Type	getSuperClass(Type t)
protected boolean	isArrayValue(Value value)
protected boolean	isAssignableFrom(Type t, Type u)
protected boolean	isInterface(Type t)
protected boolean	isSubTypeOf(Value value, Value expected)
Value	merge(Value v, Value w)	Merges two values.
Value	newValue(Type type)	Creates a new value that represents the given type.
void	setClassLoader(ClassLoader loader)	Set the ClassLoader which will be used to load referenced classes.

Methods inherited from class BasicVerifier

binaryOperation, copyOperation, naryOperation, returnOperation, ternaryOperation, unaryOperation

Methods inherited from class BasicInterpreter

newOperation

Methods inherited from class Object

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

Constructor Details

SimpleVerifier

public SimpleVerifier()

Constructs a new SimpleVerifier.

SimpleVerifier

public SimpleVerifier(Type currentClass,
 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.

Parameters:

currentClass - the class that is verified.

currentSuperClass - the super class of the class that is verified.

isInterface - if the class that is verified is an interface.

SimpleVerifier

public SimpleVerifier(Type currentClass,
 Type currentSuperClass,
 List 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:

currentClass - the class that is verified.

currentSuperClass - the super class of the class that is verified.

currentClassInterfaces - the interfaces implemented by the class that is verified.

isInterface - if the class that is verified is an interface.

Method Details

setClassLoader

public void setClassLoader(ClassLoader loader)

Set the ClassLoader which will be used to load referenced classes. This is useful if you are verifying multiple interdependent classes.

Parameters:

loader - a ClassLoader to use

newValue

public Value newValue(Type type)

Description copied from interface: 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 interface Interpreter

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(Value value)

Overrides:

isArrayValue in class BasicVerifier

getElementValue

protected Value getElementValue(Value objectArrayValue)
                         throws AnalyzerException

Overrides:

getElementValue in class BasicVerifier

Throws:

AnalyzerException

isSubTypeOf

protected boolean isSubTypeOf(Value value,
 Value expected)

Overrides:

isSubTypeOf in class BasicVerifier

merge

public Value merge(Value v,
 Value w)

Description copied from interface: 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 interface Interpreter

Overrides:

merge in class BasicInterpreter

Parameters:

v - a value.

w - another value.

Returns:

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

isInterface

protected boolean isInterface(Type t)

getSuperClass

protected Type getSuperClass(Type t)

isAssignableFrom

protected boolean isAssignableFrom(Type t,
 Type u)

getClass

protected Class getClass(Type t)