Package jadx.core.dex.visitors.regions

Class SwitchOverStringVisitor

java.lang.Object

jadx.core.dex.visitors.AbstractVisitor

jadx.core.dex.visitors.regions.SwitchOverStringVisitor

All Implemented Interfaces:

IDexTreeVisitor, IRegionIterativeVisitor

public class SwitchOverStringVisitor
extends AbstractVisitor
implements IRegionIterativeVisitor

A switch(string) java code will be compiled to two switches in class code. Sometimes, android's d8/r8 will make some further modification. 1st switch could be changed to ifs to reduce size of dex. 2nd switch could be flattened and removed if there are many cases using a same block.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	SwitchOverStringVisitor.CaseData
private static final class	SwitchOverStringVisitor.SwitchData
private static enum	SwitchOverStringVisitor.SwitchStringType

Field Summary

Fields

Modifier and Type	Field	Description
private static final Integer	DEFAULT_NUM_VALUE

Constructor Summary

Constructors

Constructor	Description
SwitchOverStringVisitor()

Method Summary

Modifier and Type	Method	Description
private static boolean	collectPart1RegionCases(SwitchOverStringVisitor.SwitchData data)	store str and num/caseBlock in switchData validate: - case key is hashcode of strValue - case block is str.equals compare - str compare thenBlock is num assign (SWITCH_SWITCH and IF_SWITCH)
private static @Nullable Integer	extractConstNumber(SwitchOverStringVisitor.SwitchData switchData, @Nullable InsnNode numInsn)
private static @Nullable BlockNode	getOnlyOneInsnBlock(BlockNode b)
private static @Nullable InvokeNode	getStrHashcodeInvokeInsn(InsnArg arg)
private static boolean	isIfStringEqualsInsn(InsnNode ifInsn)
private static boolean	prepareMergedSwitchCases(SwitchOverStringVisitor.SwitchData data)	create cases according to part2Region (part1Region if is SINGLE_SWITCH).
private static boolean	replaceWithMergedSwitch(SwitchOverStringVisitor.SwitchData data)	replace with new switch.
private boolean	restoreSwitchOverString(MethodNode mth, IRegion part1Region)
private static Integer	unwrapIntKey(Object key)
void	visit(MethodNode mth)	Visit method
boolean	visitRegion(MethodNode mth, IRegion region)	If return 'true' traversal will be restarted.

Methods inherited from class jadx.core.dex.visitors.AbstractVisitor

getName, init, toString, visit

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_NUM_VALUE

private static final Integer DEFAULT_NUM_VALUE

Constructor Details

SwitchOverStringVisitor

public SwitchOverStringVisitor()

Method Details

visit

public void visit(MethodNode mth)
           throws JadxException

Description copied from interface: IDexTreeVisitor

Visit method

Specified by:

visit in interface IDexTreeVisitor

Overrides:

visit in class AbstractVisitor

Throws:

JadxException

visitRegion

public boolean visitRegion(MethodNode mth,
 IRegion region)

Description copied from interface: IRegionIterativeVisitor

If return 'true' traversal will be restarted.

Specified by:

visitRegion in interface IRegionIterativeVisitor

restoreSwitchOverString

private boolean restoreSwitchOverString(MethodNode mth,
 IRegion part1Region)

collectPart1RegionCases

private static boolean collectPart1RegionCases(SwitchOverStringVisitor.SwitchData data)

store str and num/caseBlock in switchData validate: - case key is hashcode of strValue - case block is str.equals compare - str compare thenBlock is num assign (SWITCH_SWITCH and IF_SWITCH)

prepareMergedSwitchCases

private static boolean prepareMergedSwitchCases(SwitchOverStringVisitor.SwitchData data)

create cases according to part2Region (part1Region if is SINGLE_SWITCH). replace keys with strings.

replaceWithMergedSwitch

private static boolean replaceWithMergedSwitch(SwitchOverStringVisitor.SwitchData data)

replace with new switch. remove original code

extractConstNumber

@Nullable
private static @Nullable Integer extractConstNumber(SwitchOverStringVisitor.SwitchData switchData,
 @Nullable
 @Nullable InsnNode numInsn)

unwrapIntKey

private static Integer unwrapIntKey(Object key)

getStrHashcodeInvokeInsn

@Nullable
private static @Nullable InvokeNode getStrHashcodeInvokeInsn(InsnArg arg)

isIfStringEqualsInsn

private static boolean isIfStringEqualsInsn(InsnNode ifInsn)

getOnlyOneInsnBlock

@Nullable
private static @Nullable BlockNode getOnlyOneInsnBlock(BlockNode b)