org.objectweb.asm.tree.analysis
Class BasicVerifier

java.lang.Object
  extended by org.objectweb.asm.tree.analysis.BasicInterpreter
      extended by org.objectweb.asm.tree.analysis.BasicVerifier
All Implemented Interfaces:
Opcodes, Interpreter
Direct Known Subclasses:
SimpleVerifier

public class BasicVerifier
extends BasicInterpreter

An extended BasicInterpreter that checks that bytecode instructions are correctly used.

Author:
Eric Bruneton, Bing Ran

Field Summary
 
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_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, V1_6
 
Constructor Summary
BasicVerifier()
           
 
Method Summary
 Value binaryOperation(AbstractInsnNode insn, Value value1, Value value2)
          Interprets a bytecode instruction with two arguments.
 Value copyOperation(AbstractInsnNode insn, Value value)
          Interprets a bytecode instruction that moves a value on the stack or to or from local variables.
protected  Value getElementValue(Value objectArrayValue)
           
protected  boolean isArrayValue(Value value)
           
protected  boolean isSubTypeOf(Value value, Value expected)
           
 Value naryOperation(AbstractInsnNode insn, List values)
          Interprets a bytecode instruction with a variable number of arguments.
 Value ternaryOperation(AbstractInsnNode insn, Value value1, Value value2, Value value3)
          Interprets a bytecode instruction with three arguments.
 Value unaryOperation(AbstractInsnNode insn, Value value)
          Interprets a bytecode instruction with a single argument.
 
Methods inherited from class org.objectweb.asm.tree.analysis.BasicInterpreter
merge, newOperation, newValue
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BasicVerifier

public BasicVerifier()
Method Detail

copyOperation

public Value copyOperation(AbstractInsnNode insn,
                           Value value)
                    throws AnalyzerException
Description copied from interface: Interpreter
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

Specified by:
copyOperation in interface Interpreter
Overrides:
copyOperation in class BasicInterpreter
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.

unaryOperation

public Value unaryOperation(AbstractInsnNode insn,
                            Value value)
                     throws AnalyzerException
Description copied from interface: Interpreter
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

Specified by:
unaryOperation in interface Interpreter
Overrides:
unaryOperation in class BasicInterpreter
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.

binaryOperation

public Value binaryOperation(AbstractInsnNode insn,
                             Value value1,
                             Value value2)
                      throws AnalyzerException
Description copied from interface: Interpreter
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

Specified by:
binaryOperation in interface Interpreter
Overrides:
binaryOperation in class BasicInterpreter
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.

ternaryOperation

public Value ternaryOperation(AbstractInsnNode insn,
                              Value value1,
                              Value value2,
                              Value value3)
                       throws AnalyzerException
Description copied from interface: Interpreter
Interprets a bytecode instruction with three arguments. This method is called for the following opcodes: IASTORE, LASTORE, FASTORE, DASTORE, AASTORE, BASTORE, CASTORE, SASTORE

Specified by:
ternaryOperation in interface Interpreter
Overrides:
ternaryOperation in class BasicInterpreter
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.

naryOperation

public Value naryOperation(AbstractInsnNode insn,
                           List values)
                    throws AnalyzerException
Description copied from interface: Interpreter
Interprets a bytecode instruction with a variable number of arguments. This method is called for the following opcodes: INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC, INVOKEINTERFACE, MULTIANEWARRAY

Specified by:
naryOperation in interface Interpreter
Overrides:
naryOperation in class BasicInterpreter
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.

isArrayValue

protected boolean isArrayValue(Value value)

getElementValue

protected Value getElementValue(Value objectArrayValue)
                         throws AnalyzerException
Throws:
AnalyzerException

isSubTypeOf

protected boolean isSubTypeOf(Value value,
                              Value expected)