private void generateBridge(
@Nullable PsiElement origin,
@NotNull FunctionDescriptor descriptor,
@NotNull Method bridge,
@NotNull Method delegateTo,
boolean isSpecialBridge,
boolean isStubDeclarationWithDelegationToSuper) {
boolean isSpecialOrDelegationToSuper =
isSpecialBridge || isStubDeclarationWithDelegationToSuper;
int flags =
ACC_PUBLIC
| ACC_BRIDGE
| (!isSpecialOrDelegationToSuper ? ACC_SYNTHETIC : 0)
| (isSpecialBridge ? ACC_FINAL : 0); // TODO.
MethodVisitor mv =
v.newMethod(
JvmDeclarationOriginKt.Bridge(descriptor, origin),
flags,
bridge.getName(),
bridge.getDescriptor(),
null,
null);
if (state.getClassBuilderMode() != ClassBuilderMode.FULL) return;
mv.visitCode();
Type[] argTypes = bridge.getArgumentTypes();
Type[] originalArgTypes = delegateTo.getArgumentTypes();
InstructionAdapter iv = new InstructionAdapter(mv);
MemberCodegen.markLineNumberForDescriptor(owner.getThisDescriptor(), iv);
if (delegateTo.getArgumentTypes().length == 1 && isSpecialBridge) {
generateTypeCheckBarrierIfNeeded(
iv, descriptor, bridge.getReturnType(), delegateTo.getArgumentTypes()[0]);
}
iv.load(0, OBJECT_TYPE);
for (int i = 0, reg = 1; i < argTypes.length; i++) {
StackValue.local(reg, argTypes[i]).put(originalArgTypes[i], iv);
//noinspection AssignmentToForLoopParameter
reg += argTypes[i].getSize();
}
if (isStubDeclarationWithDelegationToSuper) {
ClassDescriptor parentClass =
getSuperClassDescriptor((ClassDescriptor) descriptor.getContainingDeclaration());
assert parentClass != null;
String parentInternalName = typeMapper.mapClass(parentClass).getInternalName();
iv.invokespecial(parentInternalName, delegateTo.getName(), delegateTo.getDescriptor());
} else {
iv.invokevirtual(v.getThisName(), delegateTo.getName(), delegateTo.getDescriptor());
}
StackValue.coerce(delegateTo.getReturnType(), bridge.getReturnType(), iv);
iv.areturn(bridge.getReturnType());
endVisit(mv, "bridge method", origin);
}
private void generateMethodAnnotations(
@NotNull FunctionDescriptor functionDescriptor, Method asmMethod, MethodVisitor mv) {
AnnotationCodegen annotationCodegen = AnnotationCodegen.forMethod(mv, typeMapper);
if (functionDescriptor instanceof PropertyAccessorDescriptor) {
AnnotationUseSiteTarget target =
functionDescriptor instanceof PropertySetterDescriptor
? PROPERTY_SETTER
: PROPERTY_GETTER;
annotationCodegen.genAnnotations(functionDescriptor, asmMethod.getReturnType(), target);
} else {
annotationCodegen.genAnnotations(functionDescriptor, asmMethod.getReturnType());
}
}
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));
}
}
}
private void generateBridge(@NotNull Method bridge, @NotNull Method delegate) {
if (bridge.equals(delegate)) return;
MethodVisitor mv =
v.newMethod(
OtherOrigin(element, funDescriptor),
ACC_PUBLIC | ACC_BRIDGE,
bridge.getName(),
bridge.getDescriptor(),
null,
ArrayUtil.EMPTY_STRING_ARRAY);
if (state.getClassBuilderMode() != ClassBuilderMode.FULL) return;
mv.visitCode();
InstructionAdapter iv = new InstructionAdapter(mv);
ImplementationBodyCodegen.markLineNumberForSyntheticFunction(
DescriptorUtils.getParentOfType(funDescriptor, ClassDescriptor.class), iv);
iv.load(0, asmType);
ReceiverParameterDescriptor receiver = funDescriptor.getExtensionReceiverParameter();
int count = 1;
if (receiver != null) {
StackValue.local(count, bridge.getArgumentTypes()[count - 1])
.put(typeMapper.mapType(receiver.getType()), iv);
count++;
}
List<ValueParameterDescriptor> params = funDescriptor.getValueParameters();
for (ValueParameterDescriptor param : params) {
StackValue.local(count, bridge.getArgumentTypes()[count - 1])
.put(typeMapper.mapType(param.getType()), iv);
count++;
}
iv.invokevirtual(
asmType.getInternalName(), delegate.getName(), delegate.getDescriptor(), false);
StackValue.onStack(delegate.getReturnType()).put(bridge.getReturnType(), iv);
iv.areturn(bridge.getReturnType());
FunctionCodegen.endVisit(mv, "bridge", element);
}
private static void generateDelegateToMethodBody(
boolean isStatic,
@NotNull MethodVisitor mv,
@NotNull Method asmMethod,
@NotNull String classToDelegateTo) {
InstructionAdapter iv = new InstructionAdapter(mv);
Type[] argTypes = asmMethod.getArgumentTypes();
// The first line of some package file is written to the line number attribute of a static
// delegate to allow to 'step into' it
// This is similar to what javac does with bridge methods
Label label = new Label();
iv.visitLabel(label);
iv.visitLineNumber(1, label);
int k = isStatic ? 0 : 1;
for (Type argType : argTypes) {
iv.load(k, argType);
k += argType.getSize();
}
iv.invokestatic(classToDelegateTo, asmMethod.getName(), asmMethod.getDescriptor(), false);
iv.areturn(asmMethod.getReturnType());
}
