[K/N] Support of aligned fields

For now only alignment by at most 8 is supported for instance fields.

^KT-54944

kotlin-native/runtime/src/main/cpp/Alignment.hpp

@@ -11,6 +11,7 @@
 
 namespace kotlin {
 
+// Must match objectAlignment in Runtime.kt
 constexpr size_t kObjectAlignment = 8;
 
 template <typename T>

kotlin-native/runtime/src/main/cpp/ObjCExport.mm

@@ -656,6 +656,7 @@ static const TypeInfo* createTypeInfo(
   result->superType_ = superType;
   if (fieldsInfo == nullptr) {
     result->instanceSize_ = superType->instanceSize_;
+    result->instanceAlignment_ = superType->instanceAlignment_;
     result->objOffsets_ = superType->objOffsets_;
     result->objOffsetsCount_ = superType->objOffsetsCount_; // So TF_IMMUTABLE can also be inherited:
     if ((superType->flags_ & TF_IMMUTABLE) != 0) {
@@ -664,6 +665,7 @@ static const TypeInfo* createTypeInfo(
     result->processObjectInMark = superType->processObjectInMark;
   } else {
     result->instanceSize_ = fieldsInfo->instanceSize_;
+    result->instanceAlignment_ = fieldsInfo->instanceAlignment_;
     result->objOffsets_ = fieldsInfo->objOffsets_;
     result->objOffsetsCount_ = fieldsInfo->objOffsetsCount_;
     result->processObjectInMark = fieldsInfo->processObjectInMark;

kotlin-native/runtime/src/main/cpp/ObjectTestSupport.hpp

@@ -30,6 +30,7 @@ private:
         std_support::vector<int32_t> objOffsets_;
         int32_t objOffsetsCount_ = 0;
         int32_t flags_ = 0;
+        int32_t instanceAlignment_ = 8;
         const TypeInfo* superType_ = nullptr;
         void (*processObjectInMark_)(void*, ObjHeader*) = nullptr;
     };
@@ -90,6 +91,7 @@ public:
         typeInfo_.processObjectInMark = builder.processObjectInMark_;
         typeInfo_.flags_ = builder.flags_;
         typeInfo_.superType_ = builder.superType_;
+        typeInfo_.instanceAlignment_ = builder.instanceAlignment_;
     }
 
     TypeInfo* typeInfo() noexcept { return &typeInfo_; }

kotlin-native/runtime/src/main/cpp/TypeInfo.h

@@ -90,6 +90,10 @@ struct InterfaceTableRecord {
 
 // This struct represents runtime type information and by itself is the compile time
 // constant.
+// When adding a field here do not forget to adjust:
+//   1. RTTIGenerator
+//   2. ObjectTestSupport TypeInfoHolder
+//   3. createTypeInfo in ObjcExport.mm
 struct TypeInfo {
     // Reference to self, to allow simple obtaining TypeInfo via meta-object.
     const TypeInfo* typeInfo_;
@@ -136,6 +140,10 @@ struct TypeInfo {
     // TODO: Consider providing a generic traverse method instead.
     void (*processObjectInMark)(void* state, ObjHeader* object);
 
+    // Required alignment of instance
+    uint32_t instanceAlignment_;
+
+
     // vtable starts just after declared contents of the TypeInfo:
     // void* const vtable_[];
 #ifdef __cplusplus