Class BasicVerifier

java.lang.Object

org.objectweb.asm.tree.analysis.BasicInterpreter

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 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
BasicVerifier()

Method Summary

Modifier and Type	Method	Description
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.
void	returnOperation(AbstractInsnNode insn, Value value, Value expected)	Interprets a bytecode return instruction.
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 BasicInterpreter

merge, newOperation, newValue

Methods inherited from class Object

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

Constructor Details

BasicVerifier

public BasicVerifier()

Method Details

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.

returnOperation

public void returnOperation(AbstractInsnNode insn,
 Value value,
 Value expected)
                     throws AnalyzerException

Description copied from interface: Interpreter

Interprets a bytecode return instruction. This method is called for the following opcodes: IRETURN, LRETURN, FRETURN, DRETURN, ARETURN

Specified by:

returnOperation in interface Interpreter

Overrides:

returnOperation in class BasicInterpreter

Parameters:

insn - the bytecode instruction to be interpreted.

value - the argument of the instruction to be interpreted.

expected - the expected return type of the analyzed method.

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)