org.objectweb.asm.tree.analysis
Class SimpleVerifier

java.lang.Object
  extended by org.objectweb.asm.tree.analysis.BasicInterpreter
      extended by org.objectweb.asm.tree.analysis.BasicVerifier
          extended by org.objectweb.asm.tree.analysis.SimpleVerifier
All Implemented Interfaces:
Constants, 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 org.objectweb.asm.Constants
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, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, 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, 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, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, 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, V1_1, V1_2, V1_3, V1_4, V1_5
 
Constructor Summary
SimpleVerifier()
           
 
Method Summary
protected  Class getClass(Type t)
           
protected  Value getElementValue(Value objectArrayValue)
           
protected  boolean isArrayValue(Value value)
           
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.
 
Methods inherited from class org.objectweb.asm.tree.analysis.BasicVerifier
binaryOperation, copyOperation, naryOperation, ternaryOperation, unaryOperation
 
Methods inherited from class org.objectweb.asm.tree.analysis.BasicInterpreter
newOperation
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SimpleVerifier

public SimpleVerifier()
Method Detail

newValue

public Value newValue(Type type)
Description copied from interface: Interpreter
Creates a new value that represents the given type.

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.

getClass

protected Class getClass(Type t)