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/*
* 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 org.jetbrains.annotations.NotNull;
import org.jetbrains.kotlin.codegen.state.GenerationState;
import org.jetbrains.kotlin.codegen.state.KotlinTypeMapper;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.descriptors.impl.ClassDescriptorImpl;
import org.jetbrains.kotlin.descriptors.impl.SimpleFunctionDescriptorImpl;
import org.jetbrains.kotlin.fileClasses.JvmFileClassUtil;
import org.jetbrains.kotlin.incremental.components.NoLookupLocation;
import org.jetbrains.kotlin.load.java.descriptors.JavaClassDescriptor;
import org.jetbrains.kotlin.load.kotlin.PackagePartClassUtils;
import org.jetbrains.kotlin.name.FqName;
import org.jetbrains.kotlin.name.Name;
import org.jetbrains.kotlin.psi.KtFile;
import org.jetbrains.kotlin.resolve.DescriptorUtils;
import org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilsKt;
import org.jetbrains.kotlin.resolve.jvm.diagnostics.JvmDeclarationOriginKt;
import org.jetbrains.kotlin.types.KotlinType;
import org.jetbrains.kotlin.util.OperatorNameConventions;
import org.jetbrains.org.objectweb.asm.MethodVisitor;
import org.jetbrains.org.objectweb.asm.Type;
import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter;
import java.util.Collections;
import static org.jetbrains.kotlin.codegen.AsmUtil.NO_FLAG_PACKAGE_PRIVATE;
import static org.jetbrains.kotlin.codegen.AsmUtil.asmTypeByFqNameWithoutInnerClasses;
import static org.jetbrains.kotlin.resolve.jvm.AsmTypes.OBJECT_TYPE;
import static org.jetbrains.org.objectweb.asm.Opcodes.*;
public class SamWrapperCodegen {
private static final String FUNCTION_FIELD_NAME = "function";
private final GenerationState state;
private final boolean isInsideInline;
private final KotlinTypeMapper typeMapper;
private final SamType samType;
private final MemberCodegen parentCodegen;
private final int visibility;
public SamWrapperCodegen(
@NotNull GenerationState state,
@NotNull SamType samType,
@NotNull MemberCodegen parentCodegen,
boolean isInsideInline
) {
this.state = state;
this.isInsideInline = isInsideInline;
this.typeMapper = state.getTypeMapper();
this.samType = samType;
this.parentCodegen = parentCodegen;
visibility = isInsideInline ? ACC_PUBLIC : NO_FLAG_PACKAGE_PRIVATE;
}
@NotNull
public Type genWrapper(@NotNull KtFile file) {
// Name for generated class, in form of whatever$1
FqName fqName = getWrapperName(file);
Type asmType = asmTypeByFqNameWithoutInnerClasses(fqName);
// e.g. (T, T) -> Int
KotlinType functionType = samType.getKotlinFunctionType();
ClassDescriptor classDescriptor = new ClassDescriptorImpl(
samType.getJavaClassDescriptor().getContainingDeclaration(),
fqName.shortName(),
Modality.FINAL,
ClassKind.CLASS,
Collections.singleton(samType.getType()),
SourceElement.NO_SOURCE
);
// e.g. compare(T, T)
SimpleFunctionDescriptor erasedInterfaceFunction = samType.getAbstractMethod().getOriginal().copy(
classDescriptor,
Modality.FINAL,
Visibilities.PUBLIC,
CallableMemberDescriptor.Kind.SYNTHESIZED,
/*copyOverrides=*/ false
);
ClassBuilder cv = state.getFactory().newVisitor(JvmDeclarationOriginKt.OtherOrigin(erasedInterfaceFunction), asmType, file);
cv.defineClass(file,
V1_6,
ACC_FINAL | ACC_SUPER | visibility,
asmType.getInternalName(),
null,
OBJECT_TYPE.getInternalName(),
new String[]{ typeMapper.mapType(samType.getType()).getInternalName() }
);
cv.visitSource(file.getName(), null);
WriteAnnotationUtilKt.writeSyntheticClassMetadata(cv);
// e.g. ASM type for Function2
Type functionAsmType = typeMapper.mapType(functionType);
cv.newField(JvmDeclarationOriginKt.OtherOrigin(erasedInterfaceFunction),
ACC_SYNTHETIC | ACC_PRIVATE | ACC_FINAL,
FUNCTION_FIELD_NAME,
functionAsmType.getDescriptor(),
null,
null);
generateConstructor(asmType, functionAsmType, cv);
generateMethod(asmType, functionAsmType, cv, erasedInterfaceFunction, functionType);
cv.done();
return asmType;
}
private void generateConstructor(Type ownerType, Type functionType, ClassBuilder cv) {
MethodVisitor mv = cv.newMethod(JvmDeclarationOriginKt.OtherOrigin(samType.getJavaClassDescriptor()),
visibility, "", Type.getMethodDescriptor(Type.VOID_TYPE, functionType), null, null);
if (state.getClassBuilderMode() == ClassBuilderMode.FULL) {
mv.visitCode();
InstructionAdapter iv = new InstructionAdapter(mv);
// super constructor
iv.load(0, OBJECT_TYPE);
iv.invokespecial(OBJECT_TYPE.getInternalName(), "", "()V", false);
// save parameter to field
iv.load(0, OBJECT_TYPE);
iv.load(1, functionType);
iv.putfield(ownerType.getInternalName(), FUNCTION_FIELD_NAME, functionType.getDescriptor());
iv.visitInsn(RETURN);
FunctionCodegen.endVisit(iv, "constructor of SAM wrapper", null);
}
}
private void generateMethod(
Type ownerType,
Type functionType,
ClassBuilder cv,
SimpleFunctionDescriptor erasedInterfaceFunction,
KotlinType functionJetType
) {
// using root context to avoid creating ClassDescriptor and everything else
FunctionCodegen codegen = new FunctionCodegen(state.getRootContext().intoClass(
(ClassDescriptor) erasedInterfaceFunction.getContainingDeclaration(), OwnerKind.IMPLEMENTATION, state), cv, state, parentCodegen);
FunctionDescriptor invokeFunction =
functionJetType.getMemberScope().getContributedFunctions(OperatorNameConventions.INVOKE, NoLookupLocation.FROM_BACKEND).iterator().next().getOriginal();
StackValue functionField = StackValue.field(functionType, ownerType, FUNCTION_FIELD_NAME, false, StackValue.none());
codegen.genSamDelegate(erasedInterfaceFunction, invokeFunction, functionField);
// generate sam bridges
// TODO: erasedInterfaceFunction is actually not an interface function, but function in generated class
SimpleFunctionDescriptor originalInterfaceErased = samType.getAbstractMethod().getOriginal();
SimpleFunctionDescriptorImpl descriptorForBridges = SimpleFunctionDescriptorImpl
.create(erasedInterfaceFunction.getContainingDeclaration(), erasedInterfaceFunction.getAnnotations(), originalInterfaceErased.getName(),
CallableMemberDescriptor.Kind.DECLARATION, erasedInterfaceFunction.getSource());
descriptorForBridges
.initialize(null, originalInterfaceErased.getDispatchReceiverParameter(), originalInterfaceErased.getTypeParameters(),
originalInterfaceErased.getValueParameters(), originalInterfaceErased.getReturnType(),
Modality.OPEN, originalInterfaceErased.getVisibility());
DescriptorUtilsKt.setSingleOverridden(descriptorForBridges, originalInterfaceErased);
codegen.generateBridges(descriptorForBridges);
}
@NotNull
private FqName getWrapperName(@NotNull KtFile containingFile) {
FqName fileClassFqName = JvmFileClassUtil.getFileClassInfoNoResolve(containingFile).getFileClassFqName();
JavaClassDescriptor descriptor = samType.getJavaClassDescriptor();
int hash = PackagePartClassUtils.getPathHashCode(containingFile.getVirtualFile()) * 31 +
DescriptorUtils.getFqNameSafe(descriptor).hashCode();
String shortName = String.format(
"%s$sam$%s%s$%08x",
fileClassFqName.shortName().asString(),
descriptor.getName().asString(),
(isInsideInline ? "$i" : ""),
hash
);
return fileClassFqName.parent().child(Name.identifier(shortName));
}
}