compiler/tests/org/jetbrains/kotlin/codegen/InnerClassInfoGenTest.java

/*
 * Copyright 2010-2015 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.kotlin.codegen;

import kotlin.collections.CollectionsKt;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.backend.common.output.OutputFile;
import org.jetbrains.kotlin.name.SpecialNames;
import org.jetbrains.kotlin.test.ConfigurationKind;
import org.jetbrains.kotlin.utils.ExceptionUtilsKt;
import org.jetbrains.org.objectweb.asm.ClassReader;
import org.jetbrains.org.objectweb.asm.ClassVisitor;
import org.jetbrains.org.objectweb.asm.Opcodes;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import static org.jetbrains.org.objectweb.asm.Opcodes.*;

public class InnerClassInfoGenTest extends CodegenTestCase {
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        createEnvironmentWithMockJdkAndIdeaAnnotations(ConfigurationKind.JDK_ONLY);
        loadFile();
    }

    @NotNull
    @Override
    protected String getPrefix() {
        return "innerClassInfo";
    }

    public void testInnerClassInfo() {
        InnerClassAttribute innerB = new InnerClassAttribute("A$B", "A", "B", ACC_PUBLIC | ACC_STATIC | ACC_FINAL);
        InnerClassAttribute innerC = new InnerClassAttribute("A$B$C", "A$B", "C", ACC_PUBLIC | ACC_FINAL);
        String companionObjectDefaultName = SpecialNames.DEFAULT_NAME_FOR_COMPANION_OBJECT.asString();
        InnerClassAttribute innerACompanionObject = new InnerClassAttribute(
                "A$" + companionObjectDefaultName, "A", companionObjectDefaultName, ACC_PUBLIC | ACC_STATIC | ACC_FINAL);

        extractAndCompareInnerClasses("A", innerB, innerACompanionObject);
        extractAndCompareInnerClasses("A$B", innerB, innerC);
        extractAndCompareInnerClasses("A$B$C", innerB, innerC);
        extractAndCompareInnerClasses("A$" + companionObjectDefaultName, innerACompanionObject);
    }

    public void testLocalClass() {
        InnerClassAttribute innerB = new InnerClassAttribute("A$foo$B", null, "B", ACC_PUBLIC | ACC_STATIC | ACC_FINAL);

        extractAndCompareInnerClasses("A", innerB);
        extractAndCompareInnerClasses("A$foo$B", innerB);
    }

    public void testAnonymousClass() {
        InnerClassAttribute innerB = new InnerClassAttribute("A$B$1", null, null, ACC_PUBLIC | ACC_STATIC | ACC_FINAL);
        InnerClassAttribute innerC = new InnerClassAttribute("A$foo$C$1", null, null, ACC_PUBLIC | ACC_STATIC | ACC_FINAL);

        extractAndCompareInnerClasses("A", innerB, innerC);
        extractAndCompareInnerClasses("A$B$1", innerB);
        extractAndCompareInnerClasses("A$foo$C$1", innerC);
    }

    public void testAnonymousObjectInline() {
        InnerClassAttribute objectInInlineFun = new InnerClassAttribute("A$inlineFun$s$1", null, null, ACC_PUBLIC | ACC_STATIC | ACC_FINAL);
        extractAndCompareInnerClasses("A", objectInInlineFun);
    }

    public void testEnumEntry() {
        InnerClassAttribute innerE2 = new InnerClassAttribute("E$E2", "E", "E2", ACC_STATIC | ACC_FINAL);

        extractAndCompareInnerClasses("E", innerE2);
        extractAndCompareInnerClasses("E$E2", innerE2);
    }

    public void testInnerAccessFlags() {
        checkAccess("A", "Annotation", ACC_PUBLIC | ACC_STATIC | ACC_INTERFACE | ACC_ABSTRACT | ACC_ANNOTATION);
        checkAccess("A", "Enum", ACC_PUBLIC | ACC_STATIC | ACC_FINAL | ACC_ENUM);
        checkAccess("A", "Trait", ACC_PUBLIC | ACC_STATIC | ACC_INTERFACE | ACC_ABSTRACT);
        checkAccess("A$Trait", "DefaultImpls", ACC_PUBLIC | ACC_STATIC | ACC_FINAL);

        checkAccess("A", "OpenStaticClass", ACC_PUBLIC | ACC_STATIC);
        checkAccess("A", "FinalStaticClass", ACC_PUBLIC | ACC_STATIC | ACC_FINAL);
        checkAccess("A", "AbstractStaticClass", ACC_PUBLIC | ACC_STATIC | ACC_ABSTRACT);
        checkAccess("A", "OpenInnerClass", ACC_PUBLIC);
        checkAccess("A", "FinalInnerClass", ACC_PUBLIC | ACC_FINAL);
        checkAccess("A", "AbstractInnerClass", ACC_PUBLIC | ACC_ABSTRACT);

        checkAccess("A", "PrivateClass", ACC_PRIVATE);
        checkAccess("A", "ProtectedClass", ACC_PROTECTED);
        checkAccess("A", "InternalClass", ACC_PUBLIC);
        checkAccess("A", "PublicClass", ACC_PUBLIC);
    }

    public void testLambdaClassFlags() {
        InnerClassAttribute foo = new InnerClassAttribute("A$foo$1", null, null, ACC_STATIC | ACC_FINAL);
        InnerClassAttribute bar = new InnerClassAttribute("A$bar$1", null, null, ACC_STATIC | ACC_FINAL);

        extractAndCompareInnerClasses("A", foo, bar);
        extractAndCompareInnerClasses("A$foo$1", foo);
        extractAndCompareInnerClasses("A$bar$1", bar);
    }



    private void checkAccess(@NotNull String outerName, @NotNull String innerName, int accessFlags) {
        String name = outerName + "$" + innerName;
        InnerClassAttribute attribute = CollectionsKt.single(extractInnerClasses(name), value -> innerName.equals(value.innerName));

        InnerClassAttribute expectedAttribute = new InnerClassAttribute(name, outerName, innerName, accessFlags);

        assertEquals(expectedAttribute, attribute);
    }

    private void extractAndCompareInnerClasses(@NotNull String className, @NotNull InnerClassAttribute... expectedInnerClasses) {
        assertSameElements(extractInnerClasses(className), expectedInnerClasses);
    }

    @NotNull
    private List<InnerClassAttribute> extractInnerClasses(@NotNull String className) {
        OutputFile outputFile = generateClassesInFile().get(className + ".class");
        assertNotNull(outputFile);
        byte[] bytes = outputFile.asByteArray();
        ClassReader reader = new ClassReader(bytes);
        List<InnerClassAttribute> result = new ArrayList<>();

        reader.accept(new ClassVisitor(ASM5) {
            @Override
            public void visitInnerClass(@NotNull String name, String outerName, String innerName, int access) {
                result.add(new InnerClassAttribute(name, outerName, innerName, access));
            }
        }, ClassReader.SKIP_CODE | ClassReader.SKIP_FRAMES);

        return result;
    }

    private static class InnerClassAttribute {
        private final String name;
        private final String outerName;
        private final String innerName;
        private final int access;

        private InnerClassAttribute(@NotNull String name, @Nullable String outerName, @Nullable String innerName, int access) {
            this.name = name;
            this.outerName = outerName;
            this.innerName = innerName;
            this.access = access;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;

            InnerClassAttribute attribute = (InnerClassAttribute) o;

            if (!name.equals(attribute.name)) return false;
            if (outerName != null ? !outerName.equals(attribute.outerName) : attribute.outerName != null) return false;
            if (innerName != null ? !innerName.equals(attribute.innerName) : attribute.innerName != null) return false;
            if (access != attribute.access) return false;

            return true;
        }

        @Override
        public int hashCode() {
            int result = name.hashCode();
            result = 31 * result + (outerName != null ? outerName.hashCode() : 0);
            result = 31 * result + (innerName != null ? innerName.hashCode() : 0);
            result = 31 * result + access;
            return result;
        }

        @Override
        public String toString() {
            return String.format("InnerClass(name=%s, outerName=%s, innerName=%s, access=%s)",
                                 name, outerName, innerName, renderAccess(access));
        }

        @NotNull
        private static String renderAccess(int access) {
            try {
                StringBuilder sb = new StringBuilder();
                for (Field field : Opcodes.class.getDeclaredFields()) {
                    String name = field.getName();
                    if (name.startsWith("ACC_") && (access & field.getInt(null)) != 0) {
                        sb.append("|");
                        sb.append(name);
                    }
                }
                String result = sb.toString();
                return result.isEmpty() ? "<empty>" : result.substring(1);
            }
            catch (Exception e) {
                throw ExceptionUtilsKt.rethrow(e);
            }
        }
    }
}