void generateDefaultIfNeeded(
@NotNull MethodContext owner,
@NotNull FunctionDescriptor functionDescriptor,
@NotNull OwnerKind kind,
@NotNull DefaultParameterValueLoader loadStrategy,
@Nullable KtNamedFunction function) {
DeclarationDescriptor contextClass = owner.getContextDescriptor().getContainingDeclaration();
if (kind != OwnerKind.DEFAULT_IMPLS && isInterface(contextClass)) {
return;
}
if (!isDefaultNeeded(functionDescriptor)) {
return;
}
int flags =
getVisibilityAccessFlag(functionDescriptor)
| getDeprecatedAccessFlag(functionDescriptor)
| ACC_SYNTHETIC;
if (!(functionDescriptor instanceof ConstructorDescriptor)) {
flags |= ACC_STATIC | ACC_BRIDGE;
}
// $default methods are never private to be accessible from other class files (e.g. inner)
// without the need of synthetic accessors
flags &= ~ACC_PRIVATE;
Method defaultMethod = typeMapper.mapDefaultMethod(functionDescriptor, kind);
MethodVisitor mv =
v.newMethod(
JvmDeclarationOriginKt.Synthetic(function, functionDescriptor),
flags,
defaultMethod.getName(),
defaultMethod.getDescriptor(),
null,
getThrownExceptions(functionDescriptor, typeMapper));
// Only method annotations are copied to the $default method. Parameter annotations are not
// copied until there are valid use cases;
// enum constructors have two additional synthetic parameters which somewhat complicate this
// task
AnnotationCodegen.forMethod(mv, typeMapper)
.genAnnotations(functionDescriptor, defaultMethod.getReturnType());
if (state.getClassBuilderMode() == ClassBuilderMode.FULL) {
if (this.owner instanceof MultifileClassFacadeContext) {
mv.visitCode();
generateFacadeDelegateMethodBody(
mv, defaultMethod, (MultifileClassFacadeContext) this.owner);
endVisit(mv, "default method delegation", getSourceFromDescriptor(functionDescriptor));
} else {
mv.visitCode();
generateDefaultImplBody(
owner, functionDescriptor, mv, loadStrategy, function, memberCodegen, defaultMethod);
endVisit(mv, "default method", getSourceFromDescriptor(functionDescriptor));
}
}
}
@Nullable
private static Type getThisTypeForFunction(
@NotNull FunctionDescriptor functionDescriptor,
@NotNull MethodContext context,
@NotNull JetTypeMapper typeMapper) {
ReceiverParameterDescriptor dispatchReceiver =
functionDescriptor.getDispatchReceiverParameter();
if (functionDescriptor instanceof ConstructorDescriptor) {
return typeMapper.mapType(functionDescriptor);
} else if (dispatchReceiver != null) {
return typeMapper.mapType(dispatchReceiver.getType());
} else if (isFunctionLiteral(functionDescriptor)
|| isLocalFunction(functionDescriptor)
|| isFunctionExpression(functionDescriptor)) {
return typeMapper.mapType(context.getThisDescriptor());
} else {
return null;
}
}
public static void generateDefaultImplBody(
@NotNull MethodContext methodContext,
@NotNull FunctionDescriptor functionDescriptor,
@NotNull MethodVisitor mv,
@NotNull DefaultParameterValueLoader loadStrategy,
@Nullable KtNamedFunction function,
@NotNull MemberCodegen<?> parentCodegen,
@NotNull Method defaultMethod) {
GenerationState state = parentCodegen.state;
JvmMethodSignature signature =
state.getTypeMapper().mapSignature(functionDescriptor, methodContext.getContextKind());
boolean isStatic = isStaticMethod(methodContext.getContextKind(), functionDescriptor);
FrameMap frameMap = createFrameMap(state, functionDescriptor, signature, isStatic);
ExpressionCodegen codegen =
new ExpressionCodegen(
mv, frameMap, signature.getReturnType(), methodContext, state, parentCodegen);
CallGenerator generator =
codegen.getOrCreateCallGeneratorForDefaultImplBody(functionDescriptor, function);
InstructionAdapter iv = new InstructionAdapter(mv);
genDefaultSuperCallCheckIfNeeded(iv, defaultMethod);
loadExplicitArgumentsOnStack(OBJECT_TYPE, isStatic, signature, generator);
List<JvmMethodParameterSignature> mappedParameters = signature.getValueParameters();
int capturedArgumentsCount = 0;
while (capturedArgumentsCount < mappedParameters.size()
&& mappedParameters.get(capturedArgumentsCount).getKind() != JvmMethodParameterKind.VALUE) {
capturedArgumentsCount++;
}
int maskIndex = 0;
List<ValueParameterDescriptor> valueParameters = functionDescriptor.getValueParameters();
for (int index = 0; index < valueParameters.size(); index++) {
if (index % Integer.SIZE == 0) {
maskIndex = frameMap.enterTemp(Type.INT_TYPE);
}
ValueParameterDescriptor parameterDescriptor = valueParameters.get(index);
Type type = mappedParameters.get(capturedArgumentsCount + index).getAsmType();
int parameterIndex = frameMap.getIndex(parameterDescriptor);
if (parameterDescriptor.declaresDefaultValue()) {
iv.load(maskIndex, Type.INT_TYPE);
iv.iconst(1 << (index % Integer.SIZE));
iv.and(Type.INT_TYPE);
Label loadArg = new Label();
iv.ifeq(loadArg);
StackValue.local(parameterIndex, type)
.store(loadStrategy.genValue(parameterDescriptor, codegen), iv);
iv.mark(loadArg);
}
generator.putValueIfNeeded(type, StackValue.local(parameterIndex, type));
}
CallableMethod method = state.getTypeMapper().mapToCallableMethod(functionDescriptor, false);
generator.genCallWithoutAssertions(method, codegen);
iv.areturn(signature.getReturnType());
}
public static void generateMethodBody(
@NotNull MethodVisitor mv,
@NotNull FunctionDescriptor functionDescriptor,
@NotNull MethodContext context,
@NotNull JvmMethodSignature signature,
@NotNull FunctionGenerationStrategy strategy,
@NotNull MemberCodegen<?> parentCodegen) {
mv.visitCode();
Label methodBegin = new Label();
mv.visitLabel(methodBegin);
JetTypeMapper typeMapper = parentCodegen.typeMapper;
if (BuiltinSpecialBridgesUtil.shouldHaveTypeSafeBarrier(
functionDescriptor, getSignatureMapper(typeMapper))) {
generateTypeCheckBarrierIfNeeded(
new InstructionAdapter(mv),
functionDescriptor,
signature.getReturnType(),
/* delegateParameterType = */ null);
}
Label methodEnd;
int functionFakeIndex = -1;
int lambdaFakeIndex = -1;
if (context.getParentContext() instanceof MultifileClassFacadeContext) {
generateFacadeDelegateMethodBody(
mv, signature.getAsmMethod(), (MultifileClassFacadeContext) context.getParentContext());
methodEnd = new Label();
} else {
FrameMap frameMap =
createFrameMap(
parentCodegen.state,
functionDescriptor,
signature,
isStaticMethod(context.getContextKind(), functionDescriptor));
if (context.isInlineMethodContext()) {
functionFakeIndex = frameMap.enterTemp(Type.INT_TYPE);
}
if (context instanceof InlineLambdaContext) {
lambdaFakeIndex = frameMap.enterTemp(Type.INT_TYPE);
}
Label methodEntry = new Label();
mv.visitLabel(methodEntry);
context.setMethodStartLabel(methodEntry);
if (!JetTypeMapper.isAccessor(functionDescriptor)) {
genNotNullAssertionsForParameters(
new InstructionAdapter(mv), parentCodegen.state, functionDescriptor, frameMap);
}
methodEnd = new Label();
context.setMethodEndLabel(methodEnd);
strategy.generateBody(mv, frameMap, signature, context, parentCodegen);
}
mv.visitLabel(methodEnd);
Type thisType = getThisTypeForFunction(functionDescriptor, context, typeMapper);
generateLocalVariableTable(
mv,
signature,
functionDescriptor,
thisType,
methodBegin,
methodEnd,
context.getContextKind());
if (context.isInlineMethodContext() && functionFakeIndex != -1) {
mv.visitLocalVariable(
JvmAbi.LOCAL_VARIABLE_NAME_PREFIX_INLINE_FUNCTION
+ functionDescriptor.getName().asString(),
Type.INT_TYPE.getDescriptor(),
null,
methodBegin,
methodEnd,
functionFakeIndex);
}
if (context instanceof InlineLambdaContext && thisType != null && lambdaFakeIndex != -1) {
String name = thisType.getClassName();
int indexOfLambdaOrdinal = name.lastIndexOf("$");
if (indexOfLambdaOrdinal > 0) {
int lambdaOrdinal = Integer.parseInt(name.substring(indexOfLambdaOrdinal + 1));
mv.visitLocalVariable(
JvmAbi.LOCAL_VARIABLE_NAME_PREFIX_INLINE_ARGUMENT + lambdaOrdinal,
Type.INT_TYPE.getDescriptor(),
null,
methodBegin,
methodEnd,
lambdaFakeIndex);
}
}
}
public void generateMethod(
@NotNull JvmDeclarationOrigin origin,
@NotNull FunctionDescriptor functionDescriptor,
@NotNull MethodContext methodContext,
@NotNull FunctionGenerationStrategy strategy) {
OwnerKind contextKind = methodContext.getContextKind();
if (isInterface(functionDescriptor.getContainingDeclaration())
&& functionDescriptor.getVisibility() == Visibilities.PRIVATE
&& contextKind != OwnerKind.DEFAULT_IMPLS) {
return;
}
JvmMethodSignature jvmSignature = typeMapper.mapSignature(functionDescriptor, contextKind);
Method asmMethod = jvmSignature.getAsmMethod();
int flags = getMethodAsmFlags(functionDescriptor, contextKind);
boolean isNative = NativeKt.hasNativeAnnotation(functionDescriptor);
if (isNative && owner instanceof MultifileClassFacadeContext) {
// Native methods are only defined in facades and do not need package part implementations
return;
}
MethodVisitor mv =
v.newMethod(
origin,
flags,
asmMethod.getName(),
asmMethod.getDescriptor(),
jvmSignature.getGenericsSignature(),
getThrownExceptions(functionDescriptor, typeMapper));
if (CodegenContextUtil.isImplClassOwner(owner)) {
v.getSerializationBindings().put(METHOD_FOR_FUNCTION, functionDescriptor, asmMethod);
}
generateMethodAnnotations(functionDescriptor, asmMethod, mv);
generateParameterAnnotations(
functionDescriptor, mv, typeMapper.mapSignature(functionDescriptor));
generateBridges(functionDescriptor);
boolean staticInCompanionObject =
AnnotationUtilKt.isPlatformStaticInCompanionObject(functionDescriptor);
if (staticInCompanionObject) {
ImplementationBodyCodegen parentBodyCodegen =
(ImplementationBodyCodegen) memberCodegen.getParentCodegen();
parentBodyCodegen.addAdditionalTask(
new JvmStaticGenerator(functionDescriptor, origin, state));
}
if (state.getClassBuilderMode() == ClassBuilderMode.LIGHT_CLASSES
|| isAbstractMethod(functionDescriptor, contextKind)) {
generateLocalVariableTable(
mv,
jvmSignature,
functionDescriptor,
getThisTypeForFunction(functionDescriptor, methodContext, typeMapper),
new Label(),
new Label(),
contextKind);
mv.visitEnd();
return;
}
if (!isNative) {
generateMethodBody(
mv, functionDescriptor, methodContext, jvmSignature, strategy, memberCodegen);
} else if (staticInCompanionObject) {
// native @JvmStatic foo() in companion object should delegate to the static native function
// moved to the outer class
mv.visitCode();
FunctionDescriptor staticFunctionDescriptor =
JvmStaticGenerator.createStaticFunctionDescriptor(functionDescriptor);
JvmMethodSignature jvmMethodSignature =
typeMapper.mapSignature(
memberCodegen.getContext().accessibleDescriptor(staticFunctionDescriptor, null));
Type owningType =
typeMapper.mapClass(
(ClassifierDescriptor) staticFunctionDescriptor.getContainingDeclaration());
generateDelegateToMethodBody(
false, mv, jvmMethodSignature.getAsmMethod(), owningType.getInternalName());
}
endVisit(mv, null, origin.getElement());
}