Package edu.umd.cs.findbugs.detect

Class SwitchFallthrough

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

edu.umd.cs.findbugs.detect.SwitchFallthrough

All Implemented Interfaces:

Detector, Priorities, StatelessDetector, java.lang.Cloneable, org.apache.bcel.classfile.Visitor

public class SwitchFallthrough
extends OpcodeStackDetector
implements StatelessDetector

Nested Class Summary

Nested classes/interfaces inherited from class edu.umd.cs.findbugs.bcel.OpcodeStackDetector

OpcodeStackDetector.WithCustomJumpInfo

Field Summary

Fields

Modifier and Type	Field	Description
private int	biggestJumpTarget
private BugAccumulator	bugAccumulator
private LocalVariableAnnotation	deadStore
private static boolean	DEBUG
(package private) XClass	enumType
(package private) java.util.Collection<SourceLineAnnotation>	found
(package private) boolean	justSawHashcode
private int	lastPC
private static boolean	LOOK_IN_SOURCE_FOR_FALLTHRU_COMMENT
private java.util.Set<XField>	potentiallyDeadFields
private java.util.Set<XField>	potentiallyDeadFieldsFromBeforeFallthrough
private java.util.BitSet	potentiallyDeadStores
private java.util.BitSet	potentiallyDeadStoresFromBeforeFallthrough
private int	priority
private boolean	reachable
private SwitchHandler	switchHdlr

Fields inherited from class edu.umd.cs.findbugs.bcel.OpcodeStackDetector

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

Constructor	Description
SwitchFallthrough(BugReporter bugReporter)

Method Summary

Modifier and Type	Method	Description
private void	clearAllDeadStores()
private void	foundSwitchNoDefault(SourceLineAnnotation s)
private boolean	hasFallThruComment(int startPC, int endPC)
boolean	isBranchTargetAfterNextCaseOffset()	A GOTO might correspond to a break or to a do/while/for loop.
void	sawOpcode(int seen)	By default, this method will not be called when stack is TOP.
void	visit(org.apache.bcel.classfile.Code obj)
void	visitClassContext(ClassContext classContext)	Visit the ClassContext for a class which should be analyzed for instances of bug patterns.

Methods inherited from class edu.umd.cs.findbugs.bcel.OpcodeStackDetector

afterOpcode, beforeOpcode, getStack, isUsingCustomUserValue, visitCode

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

getClassContext, report, shouldVisitCode

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

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 edu.umd.cs.findbugs.StatelessDetector

clone

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

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

Field Detail

DEBUG

private static final boolean DEBUG

LOOK_IN_SOURCE_FOR_FALLTHRU_COMMENT

private static final boolean LOOK_IN_SOURCE_FOR_FALLTHRU_COMMENT

switchHdlr

private SwitchHandler switchHdlr

reachable

private boolean reachable

bugAccumulator

private final BugAccumulator bugAccumulator

lastPC

private int lastPC

biggestJumpTarget

private int biggestJumpTarget

potentiallyDeadStores

private final java.util.BitSet potentiallyDeadStores

potentiallyDeadFields

private final java.util.Set<XField> potentiallyDeadFields

potentiallyDeadStoresFromBeforeFallthrough

private java.util.BitSet potentiallyDeadStoresFromBeforeFallthrough

potentiallyDeadFieldsFromBeforeFallthrough

private java.util.Set<XField> potentiallyDeadFieldsFromBeforeFallthrough

deadStore

private LocalVariableAnnotation deadStore

priority

private int priority

found

java.util.Collection<SourceLineAnnotation> found

enumType

XClass enumType

justSawHashcode

boolean justSawHashcode

Constructor Detail

SwitchFallthrough

public SwitchFallthrough(BugReporter bugReporter)

Method Detail

visitClassContext

public void visitClassContext(ClassContext classContext)

Description copied from interface: Detector

Visit the ClassContext for a class which should be analyzed for instances of bug patterns.

Specified by:

visitClassContext in interface Detector

Overrides:

visitClassContext in class BytecodeScanningDetector

Parameters:

classContext - the ClassContext

visit

public void visit(org.apache.bcel.classfile.Code obj)

Overrides:

visit in class DismantleBytecode

foundSwitchNoDefault

private void foundSwitchNoDefault(SourceLineAnnotation s)

sawOpcode

public void sawOpcode(int seen)

Description copied from class: OpcodeStackDetector

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.

Specified by:

sawOpcode in class OpcodeStackDetector

See Also:

OpcodeStackDetector.beforeOpcode(int)

isBranchTargetAfterNextCaseOffset

public boolean isBranchTargetAfterNextCaseOffset()

A GOTO might correspond to a break or to a do/while/for loop. For loops the branch target will be before the offset of the next case, for breaks we're exiting the switch so the target is actually even after the end of the last case.

Returns:

true if the branch target is after the next switch offset as it is the case for a switch break.

clearAllDeadStores

private void clearAllDeadStores()

hasFallThruComment

private boolean hasFallThruComment(int startPC,
                                   int endPC)