Add new FrameArray type

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 3d82bf8205a895693d45fc1d1a27e3118c8959ec..a66f0b14325a4a18b9fb67ba58b941d386f3885c 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -709,6 +709,8 @@ bool HeapObject::IsJSCollection() const { return IsJSMap() || IsJSSet(); }
 
 bool HeapObject::IsDescriptorArray() const { return IsFixedArray(); }
 
+bool HeapObject::IsFrameArray() const { return IsFixedArray(); }
+
 bool HeapObject::IsArrayList() const { return IsFixedArray(); }
 
 bool Object::IsLayoutDescriptor() const {
@@ -2610,6 +2612,28 @@ Object** FixedArray::RawFieldOfElementAt(int index) {
   return HeapObject::RawField(this, OffsetOfElementAt(index));
 }
 
+#define DEFINE_FRAME_ARRAY_ACCESSORS(name, type)                           \
+  type* FrameArray::name(int frame_ix) const {                             \
+    Object* obj = get(1 + frame_ix * kElementsPerFrame + k##name##Offset); \
+    return type::cast(obj);                                                \
+  }                                                                        \
+                                                                           \
+  void FrameArray::Set##name(int frame_ix, type* value) {                  \
+    set(1 + frame_ix * kElementsPerFrame + k##name##Offset, value);        \
+  }
+FRAME_ARRAY_FIELD_LIST(DEFINE_FRAME_ARRAY_ACCESSORS)
+#undef DEFINE_FRAME_ARRAY_ACCESSORS
+
+bool FrameArray::IsWasmFrame(int frame_ix) const {
+  Object* obj =
+      get(1 + frame_ix * kElementsPerFrame + kWasmFunctionIndexOffset);
+  return obj->IsSmi();
+}
+
+int FrameArray::FrameCount() const {
+  DCHECK_EQ(1, length() % kElementsPerFrame);
+  return (length() - 1) / kElementsPerFrame;
+}
 
 bool DescriptorArray::IsEmpty() {
   DCHECK(length() >= kFirstIndex ||
@@ -3223,6 +3247,7 @@ CAST_ACCESSOR(FixedDoubleArray)
 CAST_ACCESSOR(FixedTypedArrayBase)
 CAST_ACCESSOR(Float32x4)
 CAST_ACCESSOR(Foreign)
+CAST_ACCESSOR(FrameArray)
 CAST_ACCESSOR(GlobalDictionary)
 CAST_ACCESSOR(HandlerTable)
 CAST_ACCESSOR(HeapObject)