com.android.build.gradle.shrinker

Class RewriteOutputVisitor

java.lang.Object

org.objectweb.asm.ClassVisitor

com.android.build.gradle.shrinker.RewriteOutputVisitor

public class RewriteOutputVisitor
extends org.objectweb.asm.ClassVisitor

ClassVisitor that skips class members which are not reachable. It also filters the list of implemented interfaces and rewrites generic signatures not to include references to "dropped" types. This is done by replacing the referenced type with java/lang/Object: the same as ProGuard does.

Field Summary

Fields inherited from class org.objectweb.asm.ClassVisitor

api, cv

Constructor Summary

Constructors

Constructor and Description
RewriteOutputVisitor(java.util.Set<java.lang.String> members, java.util.function.Predicate<java.lang.String> classKeptPredicate, BytecodeVersion bytecodeVersion, org.objectweb.asm.ClassVisitor cv)

Method Summary

Modifier and Type	Method and Description
void	visit(int version, int access, java.lang.String name, java.lang.String signature, java.lang.String superName, java.lang.String[] interfaces) Visits the header of the class.
org.objectweb.asm.FieldVisitor	visitField(int access, java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.Object value) Visits a field of the class.
void	visitInnerClass(java.lang.String name, java.lang.String outerName, java.lang.String innerName, int access) Visits information about an inner class.
org.objectweb.asm.MethodVisitor	visitMethod(int access, java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.String[] exceptions) Visits a method of the class.

Methods inherited from class org.objectweb.asm.ClassVisitor

visitAnnotation, visitAttribute, visitEnd, visitModule, visitOuterClass, visitSource, visitTypeAnnotation

Methods inherited from class java.lang.Object

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

Constructor Detail

RewriteOutputVisitor

public RewriteOutputVisitor(@NonNull
                            java.util.Set<java.lang.String> members,
                            @NonNull
                            java.util.function.Predicate<java.lang.String> classKeptPredicate,
                            @Nullable
                            BytecodeVersion bytecodeVersion,
                            @NonNull
                            org.objectweb.asm.ClassVisitor cv)

Method Detail

visit

public void visit(int version,
                  int access,
                  java.lang.String name,
                  java.lang.String signature,
                  java.lang.String superName,
                  java.lang.String[] interfaces)

Description copied from class: org.objectweb.asm.ClassVisitor

Visits the header of the class.

Overrides:

visit in class org.objectweb.asm.ClassVisitor

Parameters:

version - the class version.

access - the class's access flags (see Opcodes). This parameter also indicates if the class is deprecated.

name - the internal name of the class (see getInternalName).

signature - the signature of this class. May be null if the class is not a generic one, and does not extend or implement generic classes or interfaces.

superName - the internal of name of the super class (see getInternalName). For interfaces, the super class is Object. May be null, but only for the Object class.

interfaces - the internal names of the class's interfaces (see getInternalName). May be null.

visitField

public org.objectweb.asm.FieldVisitor visitField(int access,
                                                 java.lang.String name,
                                                 java.lang.String desc,
                                                 java.lang.String signature,
                                                 java.lang.Object value)

Description copied from class: org.objectweb.asm.ClassVisitor

Visits a field of the class.

Overrides:

visitField in class org.objectweb.asm.ClassVisitor

Parameters:

access - the field's access flags (see Opcodes). This parameter also indicates if the field is synthetic and/or deprecated.

name - the field's name.

desc - the field's descriptor (see Type).

signature - the field's signature. May be null if the field's type does not use generic types.

value - the field's initial value. This parameter, which may be null if the field does not have an initial value, must be an Integer, a Float, a Long, a Double or a String (for int, float, long or String fields respectively). This parameter is only used for static fields. Its value is ignored for non static fields, which must be initialized through bytecode instructions in constructors or methods.

Returns:

a visitor to visit field annotations and attributes, or null if this class visitor is not interested in visiting these annotations and attributes.

visitMethod

public org.objectweb.asm.MethodVisitor visitMethod(int access,
                                                   java.lang.String name,
                                                   java.lang.String desc,
                                                   java.lang.String signature,
                                                   java.lang.String[] exceptions)

Description copied from class: org.objectweb.asm.ClassVisitor

Visits a method of the class. This method must return a new MethodVisitor instance (or null) each time it is called, i.e., it should not return a previously returned visitor.

Overrides:

visitMethod in class org.objectweb.asm.ClassVisitor

Parameters:

access - the method's access flags (see Opcodes). This parameter also indicates if the method is synthetic and/or deprecated.

name - the method's name.

desc - the method's descriptor (see Type).

signature - the method's signature. May be null if the method parameters, return type and exceptions do not use generic types.

exceptions - the internal names of the method's exception classes (see getInternalName). May be null.

Returns:

an object to visit the byte code of the method, or null if this class visitor is not interested in visiting the code of this method.

visitInnerClass

public void visitInnerClass(java.lang.String name,
                            java.lang.String outerName,
                            java.lang.String innerName,
                            int access)

Description copied from class: org.objectweb.asm.ClassVisitor

Visits information about an inner class. This inner class is not necessarily a member of the class being visited.

Overrides:

visitInnerClass in class org.objectweb.asm.ClassVisitor

Parameters:

name - the internal name of an inner class (see getInternalName).

outerName - the internal name of the class to which the inner class belongs (see getInternalName). May be null for not member classes.

innerName - the (simple) name of the inner class inside its enclosing class. May be null for anonymous inner classes.

access - the access flags of the inner class as originally declared in the enclosing class.