org.objectweb.asm.tree.analysis

Class BasicVerifier

java.lang.Object

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

org.objectweb.asm.tree.analysis.BasicInterpreter

org.objectweb.asm.tree.analysis.BasicVerifier

All Implemented Interfaces:

org.objectweb.asm.Opcodes

Direct Known Subclasses:

SimpleVerifier

public class BasicVerifier
extends BasicInterpreter

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

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_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, ASM4, ASM5, ASM6, ASM7, ASM8_EXPERIMENTAL, 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, V9

Constructor Summary

Constructors

Modifier	Constructor and Description
	BasicVerifier() Constructs a new BasicVerifier for the latest ASM API version.
protected	BasicVerifier(int api) Constructs a new BasicVerifier.

Method Summary

Modifier and Type	Method and Description
BasicValue	binaryOperation(org.objectweb.asm.tree.AbstractInsnNode insn, BasicValue value1, BasicValue value2) Interprets a bytecode instruction with two arguments.
BasicValue	copyOperation(org.objectweb.asm.tree.AbstractInsnNode insn, BasicValue value) Interprets a bytecode instruction that moves a value on the stack or to or from local variables.
protected BasicValue	getElementValue(BasicValue objectArrayValue) Returns the value corresponding to the type of the elements of the given array reference value.
protected boolean	isArrayValue(BasicValue value) Returns whether the given value corresponds to an array reference.
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	naryOperation(org.objectweb.asm.tree.AbstractInsnNode insn, java.util.List<? extends BasicValue> values) Interprets a bytecode instruction with a variable number of arguments.
void	returnOperation(org.objectweb.asm.tree.AbstractInsnNode insn, BasicValue value, BasicValue expected) Interprets a bytecode return instruction.
BasicValue	ternaryOperation(org.objectweb.asm.tree.AbstractInsnNode insn, BasicValue value1, BasicValue value2, BasicValue value3) Interprets a bytecode instruction with three arguments.
BasicValue	unaryOperation(org.objectweb.asm.tree.AbstractInsnNode insn, BasicValue 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 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 Detail

BasicVerifier

public BasicVerifier()

Constructs a new BasicVerifier for the latest ASM API version. Subclasses must not use this constructor. Instead, they must use the BasicVerifier(int) version.

BasicVerifier

protected BasicVerifier(int api)

Constructs a new BasicVerifier.

Parameters:

api - the ASM API version supported by this interpreter. Must be one of Opcodes.ASM4, Opcodes.ASM5, Opcodes.ASM6 or Opcodes.ASM7.

Method Detail

copyOperation

public BasicValue copyOperation(org.objectweb.asm.tree.AbstractInsnNode insn,
                                BasicValue value)
                         throws AnalyzerException

Description copied from class: 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

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 occurred during the interpretation.

unaryOperation

public BasicValue unaryOperation(org.objectweb.asm.tree.AbstractInsnNode insn,
                                 BasicValue value)
                          throws AnalyzerException

Description copied from class: 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

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 occurred during the interpretation.

binaryOperation

public BasicValue binaryOperation(org.objectweb.asm.tree.AbstractInsnNode insn,
                                  BasicValue value1,
                                  BasicValue value2)
                           throws AnalyzerException

Description copied from class: 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

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 occurred during the interpretation.

ternaryOperation

public BasicValue ternaryOperation(org.objectweb.asm.tree.AbstractInsnNode insn,
                                   BasicValue value1,
                                   BasicValue value2,
                                   BasicValue value3)
                            throws AnalyzerException

Description copied from class: Interpreter

Interprets a bytecode instruction with three arguments. This method is called for the following opcodes:

IASTORE, LASTORE, FASTORE, DASTORE, AASTORE, BASTORE, CASTORE, SASTORE

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 occurred during the interpretation.

naryOperation

public BasicValue naryOperation(org.objectweb.asm.tree.AbstractInsnNode insn,
                                java.util.List<? extends BasicValue> values)
                         throws AnalyzerException

Description copied from class: Interpreter

Interprets a bytecode instruction with a variable number of arguments. This method is called for the following opcodes:

INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC, INVOKEINTERFACE, MULTIANEWARRAY and INVOKEDYNAMIC

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 occurred during the interpretation.

returnOperation

public void returnOperation(org.objectweb.asm.tree.AbstractInsnNode insn,
                            BasicValue value,
                            BasicValue expected)
                     throws AnalyzerException

Description copied from class: Interpreter

Interprets a bytecode return instruction. This method is called for the following opcodes:

IRETURN, LRETURN, FRETURN, DRETURN, ARETURN

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 occurred during the interpretation.

isArrayValue

protected boolean isArrayValue(BasicValue value)

Returns whether the given value corresponds to an array reference.

Parameters:

value - a value.

Returns:

whether 'value' corresponds to an array reference.

getElementValue

protected BasicValue getElementValue(BasicValue objectArrayValue)
                              throws AnalyzerException

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

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)

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

Parameters:

value - a value.

expected - another value.

Returns:

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