Package edu.umd.cs.findbugs.bcel

Class OpcodeStackDetector

java.lang.Object

edu.umd.cs.findbugs.visitclass.BetterVisitor

edu.umd.cs.findbugs.visitclass.PreorderVisitor

edu.umd.cs.findbugs.visitclass.AnnotationVisitor

edu.umd.cs.findbugs.visitclass.DismantleBytecode

edu.umd.cs.findbugs.BytecodeScanningDetector

edu.umd.cs.findbugs.bcel.OpcodeStackDetector

All Implemented Interfaces:

Detector, Priorities, org.apache.bcel.classfile.Visitor

Direct Known Subclasses:

AbstractAssertDetector, AppendingToAnObjectOutputStream, AtomicityProblem, BadResultSetAccess, BadSyntaxForRegularExpression, BuildStringPassthruGraph, ConfusionBetweenInheritedAndOuterMethod, ConstructorThrow, CovariantArrayAssignment, CrossSiteScripting, DateFormatStringChecker, DefaultEncodingDetector, DontAssertInstanceofInTests, DontUseFloatsAsLoopCounters, DumbMethods, EqualsOperandShouldHaveClassCompatibleWithThis, ExplicitSerialization, FieldItemSummary, FindBadEndOfStreamCheck, FindBadForLoop, FindComparatorProblems, FindDoubleCheck, FindFieldSelfAssignment, FindFloatEquality, FindHEmismatch, FindInstanceLockOnSharedStaticData, FindNonShortCircuit, FindNoSideEffectMethods, FindNullDerefsInvolvingNonShortCircuitEvaluation, FindOverridableMethodCall, FindPotentialSecurityCheckBasedOnUntrustedSource, FindPublicAttributes, FindPuzzlers, FindReturnRef, FindSelfComparison, FindVulnerableSecurityCheckMethods, FormatStringChecker, FunctionsThatMightBeMistakenForProcedures, IncompatMask, InefficientIndexOf, InefficientInitializationInsideLoop, InfiniteLoop, InfiniteRecursiveLoop, InitializeNonnullFieldsInConstructor, IntCast2LongAsInstant, LostLoggerDueToWeakReference, MethodReturnCheck, MultipleInstantiationsOfSingletons, MultithreadedInstanceAccess, MutableEnum, Noise, NumberConstructor, OpcodeStackDetector.WithCustomJumpInfo, OverridingEqualsNotSymmetrical, OverridingMethodsMustInvokeSuperDetector, PermissionsSuper, ReadOfInstanceFieldInMethodInvokedByConstructorInSuperclass, ReflectionIncreaseAccessibility, RepeatedConditionals, ResourceInMultipleThreadsDetector, RuntimeExceptionCapture, SerializableIdiom, SharedVariableAtomicityDetector, StaticCalendarDetector, StringConcatenation, SwitchFallthrough, SynchronizationOnSharedBuiltinConstant, SynchronizeOnClassLiteralNotGetClass, SynchronizingOnContentsOfFieldToProtectField, TestingGround, TestingGround2, ThrowingExceptions, TypeReturnNull, UnnecessaryEnvUsage, UnreadFields, URLProblems

public abstract class OpcodeStackDetector
extends BytecodeScanningDetector

Base class for Detectors that want to scan the bytecode of a method and use an opcode stack.

See Also:

• BytecodeScanningDetector

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	OpcodeStackDetector.WithCustomJumpInfo

Field Summary

Fields

Modifier and Type	Field	Description
protected OpcodeStack	stack

Fields inherited from class edu.umd.cs.findbugs.visitclass.DismantleBytecode

codeBytes, lineNumberTable, M_BR, M_CP, M_INT, M_PAD, M_R, M_UINT

Fields inherited from interface edu.umd.cs.findbugs.Priorities

EXP_PRIORITY, HIGH_PRIORITY, IGNORE_PRIORITY, LOW_PRIORITY, NORMAL_PRIORITY

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	OpcodeStackDetector()

Method Summary

Modifier and Type	Method	Description
void	afterOpcode(int seen)	Note that stack might be TOP when this method is called.
boolean	beforeOpcode(int seen)	return false if we should skip calling sawOpcode
OpcodeStack	getStack()
final boolean	isUsingCustomUserValue()
abstract void	sawOpcode(int seen)	By default, this method will not be called when stack is TOP.
final void	visitCode(org.apache.bcel.classfile.Code obj)

Methods inherited from class edu.umd.cs.findbugs.BytecodeScanningDetector

getClassContext, report, shouldVisitCode, visitClassContext

Methods inherited from class edu.umd.cs.findbugs.visitclass.DismantleBytecode

areOppositeBranches, atCatchBlock, getBranchFallThrough, getBranchOffset, getBranchTarget, getClassConstantOperand, getClassDescriptorOperand, getCodeByte, getConstantRefOperand, getDefaultSwitchOffset, getDottedClassConstantOperand, getFieldDescriptorOperand, getIntConstant, getLongConstant, getMaxPC, getMethodDescriptorOperand, getNameConstantOperand, getNextCodeByte, getNextOpcode, getNextPC, getOpcode, getPC, getPrevOpcode, getRefConstantOperand, getRefFieldIsStatic, getRegisterOperand, getSigConstantOperand, getStringConstantOperand, getSwitchLabels, getSwitchOffsets, getXClassOperand, getXFieldOperand, getXMethodOperand, isBranch, isMethodCall, isRegisterLoad, isRegisterStore, isRegisterStore, isReturn, isShift, isSwitch, isWideOpcode, printOpCode, sawBranchTo, sawClass, sawDouble, sawField, sawFloat, sawIMethod, sawInt, sawLong, sawMethod, sawRegister, sawString, visit

Methods inherited from class edu.umd.cs.findbugs.visitclass.AnnotationVisitor

getAnnotationParameterAsEnum, getAnnotationParameterAsString, getAnnotationParameterAsStringArray, visitAnnotation, visitAnnotation, visitParameterAnnotation, visitParameterAnnotation, visitSyntheticParameterAnnotation

Methods inherited from class edu.umd.cs.findbugs.visitclass.PreorderVisitor

amVisitingMainMethod, asUnsignedByte, doVisitMethod, getClassDescriptor, getClassName, getCode, getConstantPool, getDottedClassName, getDottedFieldSig, getDottedMethodSig, getDottedSuperclassName, getField, getFieldDescriptor, getFieldIsStatic, getFieldName, getFieldSig, getFullyQualifiedFieldName, getFullyQualifiedMethodName, getMethod, getMethodDescriptor, getMethodName, getMethodSig, getMethodVisitOrder, getNumberArguments, getNumberMethodArguments, getPackageName, getSizeOfSurroundingTryBlock, getSizeOfSurroundingTryBlock, getSourceFile, getStringFromIndex, getSuperclassName, getSurroundingCaughtExceptions, getSurroundingCaughtExceptions, getSurroundingCaughtExceptionTypes, getSurroundingTryBlock, getSurroundingTryBlock, getThisClass, getXClass, getXField, getXMethod, hasInterestingClass, hasInterestingMethod, isVisitMethodsInCallOrder, setupVisitorForClass, setVisitMethodsInCallOrder, shouldVisit, toString, visitAfter, visitAfter, visitAnnotationDefault, visitAnnotationEntry, visitBootstrapMethods, visitConstantInvokeDynamic, visitConstantMethodHandle, visitConstantMethodType, visitConstantModule, visitConstantPackage, visitConstantPool, visitEnclosingMethod, visitingField, visitingMethod, visitInnerClasses, visitJavaClass, visitLineNumberTable, visitLocalVariableTable, visitMethodParameters, visitParameterAnnotationEntry, visitStackMap, visitStackMapEntry

Methods inherited from class edu.umd.cs.findbugs.visitclass.BetterVisitor

clone, report, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitCodeException, visitConstantClass, visitConstantDouble, visitConstantFieldref, visitConstantFloat, visitConstantInteger, visitConstantInterfaceMethodref, visitConstantLong, visitConstantMethodref, visitConstantNameAndType, visitConstantString, visitConstantUtf8, visitConstantValue, visitDeprecated, visitExceptionTable, visitField, visitInnerClass, visitLineNumber, visitLocalVariable, visitLocalVariableTypeTable, visitMethod, visitSignature, visitSourceFile, visitSynthetic, visitUnknown

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.bcel.classfile.Visitor

visitConstantDynamic, visitMethodParameter, visitModule, visitModuleExports, visitModuleMainClass, visitModuleOpens, visitModulePackages, visitModuleProvides, visitModuleRequires, visitNestHost, visitNestMembers, visitRecord, visitRecordComponent, visitStackMapType

Field Details

stack

protected OpcodeStack stack

Constructor Details

OpcodeStackDetector

protected OpcodeStackDetector()

Method Details

getStack

public OpcodeStack getStack()

visitCode

public final void visitCode(org.apache.bcel.classfile.Code obj)

Specified by:

visitCode in interface org.apache.bcel.classfile.Visitor

Overrides:

visitCode in class PreorderVisitor

beforeOpcode

@OverridingMethodsMustInvokeSuper
public boolean beforeOpcode(int seen)

Description copied from class: DismantleBytecode

return false if we should skip calling sawOpcode

Overrides:

beforeOpcode in class DismantleBytecode

afterOpcode

@OverridingMethodsMustInvokeSuper
public void afterOpcode(int seen)

Note that stack might be TOP when this method is called.

Overrides:

afterOpcode in class DismantleBytecode

See Also:

• sawOpcode(int)

sawOpcode

public abstract void sawOpcode(int seen)

By default, this method will not be called when stack is TOP. To change this behavior, override #beforeOpcode(int) and change to return true even if stack is TOP.

see Using FindBugs for Research to learn lattice and what TOP means.

Overrides:

sawOpcode in class DismantleBytecode

See Also:

• beforeOpcode(int)

isUsingCustomUserValue

public final boolean isUsingCustomUserValue()

Returns:

true if this detector is annotated with OpcodeStack.CustomUserValue and thus should not reuse generic OpcodeStack information from an iterative evaluation of the opcode stack. Such detectors will not use iterative opcode stack evaluation.

See Also:

• OpcodeStack.resetForMethodEntry(edu.umd.cs.findbugs.visitclass.DismantleBytecode)