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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2020 Guardsquare NV
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.shrink;
import proguard.classfile.*;
import proguard.classfile.kotlin.*;
import proguard.classfile.kotlin.visitor.*;
import proguard.classfile.visitor.*;
import proguard.util.Processable;
import java.util.*;
public class KotlinShrinker
implements KotlinMetadataVisitor,
// Implementation interfaces.
KotlinPropertyVisitor,
KotlinFunctionVisitor,
KotlinTypeAliasVisitor,
KotlinTypeVisitor,
KotlinConstructorVisitor,
KotlinTypeParameterVisitor,
KotlinValueParameterVisitor,
KotlinVersionRequirementVisitor
{
private final SimpleUsageMarker usageMarker;
KotlinShrinker(SimpleUsageMarker usageMarker)
{
this.usageMarker = usageMarker;
}
@Override
public void visitAnyKotlinMetadata(Clazz clazz, KotlinMetadata kotlinMetadata) {}
// Implementations for KotlinMetadataVisitor.
@Override
public void visitKotlinDeclarationContainerMetadata(Clazz clazz, KotlinDeclarationContainerMetadata kotlinDeclarationContainerMetadata)
{
// Compact the metadata's lists of properties and functions.
shrinkMetadataArray(kotlinDeclarationContainerMetadata.properties);
shrinkMetadataArray(kotlinDeclarationContainerMetadata.functions);
shrinkMetadataArray(kotlinDeclarationContainerMetadata.typeAliases);
shrinkMetadataArray(kotlinDeclarationContainerMetadata.localDelegatedProperties);
// Compact each remaining property and function.
kotlinDeclarationContainerMetadata.propertiesAccept( clazz, this);
kotlinDeclarationContainerMetadata.functionsAccept( clazz, this);
kotlinDeclarationContainerMetadata.typeAliasesAccept( clazz, this);
kotlinDeclarationContainerMetadata.delegatedPropertiesAccept(clazz, this);
}
@Override
public void visitKotlinClassMetadata(Clazz clazz, KotlinClassKindMetadata kotlinClassKindMetadata)
{
// Compact the metadata's own fields.
if (shouldShrinkMetadata(kotlinClassKindMetadata.companionObjectName,
kotlinClassKindMetadata.referencedCompanionClass))
{
kotlinClassKindMetadata.companionObjectName = null;
kotlinClassKindMetadata.referencedCompanionClass = null;
}
shrinkMetadataArray(kotlinClassKindMetadata.constructors);
shrinkArray(kotlinClassKindMetadata.enumEntryNames,
kotlinClassKindMetadata.referencedEnumEntries);
shrinkArray(kotlinClassKindMetadata.nestedClassNames,
kotlinClassKindMetadata.referencedNestedClasses);
shrinkArray(kotlinClassKindMetadata.sealedSubclassNames,
kotlinClassKindMetadata.referencedSealedSubClasses);
visitKotlinDeclarationContainerMetadata(clazz, kotlinClassKindMetadata);
kotlinClassKindMetadata.superTypesAccept( clazz, this);
kotlinClassKindMetadata.typeParametersAccept( clazz, this);
kotlinClassKindMetadata.versionRequirementAccept(clazz, this);
kotlinClassKindMetadata.constructorsAccept( clazz, this);
}
@Override
public void visitKotlinFileFacadeMetadata(Clazz clazz, KotlinFileFacadeKindMetadata kotlinFileFacadeKindMetadata)
{
visitKotlinDeclarationContainerMetadata(clazz, kotlinFileFacadeKindMetadata);
}
@Override
public void visitKotlinSyntheticClassMetadata(Clazz clazz, KotlinSyntheticClassKindMetadata kotlinSyntheticClassKindMetadata)
{
// Compact the metadata's lists of functions.
shrinkMetadataArray(kotlinSyntheticClassKindMetadata.functions);
// Compact each remaining property and function.
kotlinSyntheticClassKindMetadata.functionsAccept(clazz, this);
}
@Override
public void visitKotlinMultiFileFacadeMetadata(Clazz clazz, KotlinMultiFileFacadeKindMetadata kotlinMultiFileFacadeKindMetadata)
{
shrinkArray(kotlinMultiFileFacadeKindMetadata.partClassNames,
kotlinMultiFileFacadeKindMetadata.referencedPartClasses);
}
@Override
public void visitKotlinMultiFilePartMetadata(Clazz clazz, KotlinMultiFilePartKindMetadata kotlinMultiFilePartKindMetadata)
{
visitKotlinDeclarationContainerMetadata(clazz, kotlinMultiFilePartKindMetadata);
}
// Implementations for KotlinPropertyVisitor.
@Override
public void visitAnyProperty(Clazz clazz,
KotlinDeclarationContainerMetadata kotlinDeclarationContainerMetadata,
KotlinPropertyMetadata kotlinPropertyMetadata)
{
kotlinPropertyMetadata.versionRequirementAccept(clazz, kotlinDeclarationContainerMetadata, this);
kotlinPropertyMetadata.typeAccept( clazz, kotlinDeclarationContainerMetadata, this);
kotlinPropertyMetadata.setterParametersAccept( clazz, kotlinDeclarationContainerMetadata, this);
kotlinPropertyMetadata.receiverTypeAccept( clazz, kotlinDeclarationContainerMetadata, this);
kotlinPropertyMetadata.typeParametersAccept( clazz, kotlinDeclarationContainerMetadata, this);
if (shouldShrinkMetadata(kotlinPropertyMetadata.backingFieldSignature,
kotlinPropertyMetadata.referencedBackingField))
{
kotlinPropertyMetadata.backingFieldSignature = null;
kotlinPropertyMetadata.referencedBackingField = null;
}
if (shouldShrinkMetadata(kotlinPropertyMetadata.getterSignature,
kotlinPropertyMetadata.referencedGetterMethod))
{
kotlinPropertyMetadata.getterSignature = null;
kotlinPropertyMetadata.referencedGetterMethod = null;
kotlinPropertyMetadata.flags.hasGetter = false;
}
if (shouldShrinkMetadata(kotlinPropertyMetadata.setterSignature,
kotlinPropertyMetadata.referencedSetterMethod))
{
kotlinPropertyMetadata.setterSignature = null;
kotlinPropertyMetadata.referencedSetterMethod = null;
kotlinPropertyMetadata.flags.hasSetter = false;
kotlinPropertyMetadata.setterParameters.clear();
}
kotlinPropertyMetadata.versionRequirementAccept(clazz,
kotlinDeclarationContainerMetadata,
this);
if (kotlinPropertyMetadata.syntheticMethodForAnnotations != null &&
!usageMarker.isUsed(kotlinPropertyMetadata.referencedSyntheticMethodForAnnotations))
{
kotlinPropertyMetadata.syntheticMethodForAnnotations = null;
kotlinPropertyMetadata.referencedSyntheticMethodForAnnotations = null;
kotlinPropertyMetadata.referencedSyntheticMethodClass = null;
kotlinPropertyMetadata.flags.common.hasAnnotations = false;
}
// Fix inconsistencies that were introduced as
// a result of shrinking
if (kotlinPropertyMetadata.referencedBackingField != null &&
kotlinPropertyMetadata.getterSignature == null &&
kotlinPropertyMetadata.setterSignature == null &&
(kotlinPropertyMetadata.referencedBackingField.getAccessFlags() & AccessConstants.PRIVATE) != 0 &&
!kotlinPropertyMetadata.flags.visibility.isPrivate)
{
int visibility =
kotlinPropertyMetadata.flags.visibility.isProtected ? AccessConstants.PROTECTED :
AccessConstants.PUBLIC;
kotlinPropertyMetadata.referencedBackingField.accept(kotlinPropertyMetadata.referencedBackingFieldClass,
new MultiMemberVisitor(
new MemberAccessFlagCleaner(AccessConstants.PRIVATE),
new MemberAccessSetter(visibility)));
}
}
// Implementations for KotlinFunctionVisitor.
@Override
public void visitAnyFunction(Clazz clazz,
KotlinMetadata kotlinMetadata,
KotlinFunctionMetadata kotlinFunctionMetadata)
{
if (kotlinFunctionMetadata.referencedLambdaClassOrigin != null &&
shouldShrinkMetadata(kotlinFunctionMetadata.lambdaClassOriginName,
kotlinFunctionMetadata.referencedLambdaClassOrigin))
{
kotlinFunctionMetadata.lambdaClassOriginName = null;
kotlinFunctionMetadata.referencedLambdaClassOrigin = null;
}
kotlinFunctionMetadata.receiverTypeAccept( clazz, kotlinMetadata, this);
kotlinFunctionMetadata.typeParametersAccept( clazz, kotlinMetadata, this);
kotlinFunctionMetadata.valueParametersAccept(clazz, kotlinMetadata, this);
kotlinFunctionMetadata.returnTypeAccept( clazz, kotlinMetadata, this);
kotlinFunctionMetadata.contractsAccept( clazz, kotlinMetadata, new AllTypeVisitor(this));
if (kotlinFunctionMetadata.referencedDefaultMethod != null &&
!usageMarker.isUsed(kotlinFunctionMetadata.referencedDefaultMethod))
{
kotlinFunctionMetadata.referencedDefaultMethod = null;
kotlinFunctionMetadata.referencedDefaultMethodClass = null;
}
if (kotlinFunctionMetadata.referencedDefaultImplementationMethod != null &&
!usageMarker.isUsed(kotlinFunctionMetadata.referencedDefaultImplementationMethod))
{
kotlinFunctionMetadata.referencedDefaultImplementationMethod = null;
kotlinFunctionMetadata.referencedDefaultImplementationMethodClass = null;
}
// Fix inconsistencies that were introduced as
// a result of shrinking.
if (!kotlinFunctionMetadata.flags.modality.isAbstract &&
kotlinMetadata.k == KotlinConstants.METADATA_KIND_CLASS &&
((KotlinClassKindMetadata)kotlinMetadata).flags.isInterface &&
kotlinFunctionMetadata.referencedDefaultImplementationMethod == null)
{
kotlinFunctionMetadata.flags.modality.isAbstract = true;
}
}
// Implementations for KotlinConstructorVisitor.
@Override
public void visitConstructor(Clazz clazz,
KotlinClassKindMetadata kotlinClassKindMetadata,
KotlinConstructorMetadata kotlinConstructorMetadata)
{
kotlinConstructorMetadata.valueParametersAccept( clazz, kotlinClassKindMetadata, this);
kotlinConstructorMetadata.versionRequirementAccept(clazz, kotlinClassKindMetadata, this);
}
// Implementations for KotlinTypeAliasVisitor.
@Override
public void visitTypeAlias(Clazz clazz,
KotlinDeclarationContainerMetadata kotlinDeclarationContainerMetadata,
KotlinTypeAliasMetadata kotlinTypeAliasMetadata)
{
kotlinTypeAliasMetadata.typeParametersAccept( clazz, kotlinDeclarationContainerMetadata, this);
kotlinTypeAliasMetadata.underlyingTypeAccept( clazz, kotlinDeclarationContainerMetadata, this);
kotlinTypeAliasMetadata.expandedTypeAccept( clazz, kotlinDeclarationContainerMetadata, this);
kotlinTypeAliasMetadata.versionRequirementAccept(clazz, kotlinDeclarationContainerMetadata, this);
shrinkMetadataArray(kotlinTypeAliasMetadata.annotations);
}
// Implementations for KotlinTypeVisitor.
@Override
public void visitAnyType(Clazz clazz, KotlinTypeMetadata kotlinTypeMetadata)
{
kotlinTypeMetadata.typeArgumentsAccept(clazz, this);
kotlinTypeMetadata.upperBoundsAccept( clazz, this);
kotlinTypeMetadata.abbreviationAccept( clazz, this);
shrinkMetadataArray(kotlinTypeMetadata.annotations);
}
// Implementations for KotlinTypeParameterVisitor.
@Override
public void visitAnyTypeParameter(Clazz clazz, KotlinTypeParameterMetadata kotlinTypeParameterMetadata)
{
kotlinTypeParameterMetadata.upperBoundsAccept(clazz, this);
shrinkMetadataArray(kotlinTypeParameterMetadata.annotations);
}
// Implementations for KotlinValueParameterVisitor.
@Override
public void visitAnyValueParameter(Clazz clazz,
KotlinValueParameterMetadata kotlinValueParameterMetadata) {}
@Override
public void visitFunctionValParameter(Clazz clazz,
KotlinMetadata kotlinMetadata,
KotlinFunctionMetadata kotlinFunctionMetadata,
KotlinValueParameterMetadata kotlinValueParameterMetadata)
{
kotlinValueParameterMetadata.typeAccept(clazz,
kotlinMetadata,
kotlinFunctionMetadata,
this);
if (kotlinValueParameterMetadata.flags.hasDefaultValue &&
!usageMarker.isUsed(kotlinFunctionMetadata.referencedDefaultMethod))
{
kotlinValueParameterMetadata.flags.hasDefaultValue = false;
}
}
@Override
public void visitConstructorValParameter(Clazz clazz,
KotlinClassKindMetadata kotlinClassKindMetadata,
KotlinConstructorMetadata kotlinConstructorMetadata,
KotlinValueParameterMetadata kotlinValueParameterMetadata)
{
kotlinValueParameterMetadata.typeAccept(clazz,
kotlinClassKindMetadata,
kotlinConstructorMetadata,
this);
}
@Override
public void visitPropertyValParameter(Clazz clazz,
KotlinDeclarationContainerMetadata kotlinDeclarationContainerMetadata,
KotlinPropertyMetadata kotlinPropertyMetadata,
KotlinValueParameterMetadata kotlinValueParameterMetadata)
{
kotlinValueParameterMetadata.typeAccept(clazz,
kotlinDeclarationContainerMetadata,
kotlinPropertyMetadata,
this);
}
@Override
public void visitAnyVersionRequirement(Clazz clazz,
KotlinVersionRequirementMetadata kotlinVersionRequirementMetadata)
{
}
// Small helper methods.
/**
* Returns whether the given metadata element has its corresponding jvm
* implementation element shrunk, and thus should be shrunk itself.
*/
private boolean shouldShrinkMetadata(Object metadataElement, Processable jvmElement)
{
// If this method throws a NPE, there is a kotlin metadata
// element for which we could not find the corresponding
// jvm element to cache yet (see ClassReferenceFixer.visitKotlinMetadata).
return metadataElement != null &&
!usageMarker.isUsed(jvmElement);
}
/**
* Shrinks elements and their corresponding referenced element, based on
* markings on the referenced element.
*
* List is modified - must be a modifiable list!
*/
private void shrinkArray(List elements,
List referencedJavaElements)
{
shrinkArray(usageMarker, elements, referencedJavaElements);
}
/**
* Shrinks elements and their corresponding referenced element, based on
* markings on the referenced element.
*
* List is modified - must be a modifiable list!
*/
static void shrinkArray(SimpleUsageMarker usageMarker,
List elements,
List referencedJavaElements)
{
for (int k = elements.size() - 1; k >= 0; k--)
{
if (!usageMarker.isUsed(referencedJavaElements.get(k)))
{
elements .remove(k);
referencedJavaElements.remove(k);
}
}
}
/**
* Shrinks elements based on their markings.
*/
private void shrinkMetadataArray(List elements)
{
for (int k = elements.size() - 1; k >= 0; k--)
{
if (!usageMarker.isUsed(elements.get(k)))
{
elements.remove(k);
}
}
}
}
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