1 files changed, 105 insertions, 0 deletions
diff --git a/js/src/vm/Shape-inl.h b/js/src/vm/Shape-inl.h
new file mode 100644
index 0000000000..ae8c4bb844
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+++ b/js/src/vm/Shape-inl.h
@@ -0,0 +1,105 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef vm_Shape_inl_h
+#define vm_Shape_inl_h
+
+#include "vm/Shape.h"
+
+#include "vm/JSObject.h"
+#include "vm/PropertyResult.h"
+
+#include "gc/GCContext-inl.h"
+#include "gc/Marking-inl.h"
+#include "vm/PropMap-inl.h"
+
+namespace js {
+
+template <class ObjectSubclass>
+/* static */ inline bool SharedShape::ensureInitialCustomShape(
+    JSContext* cx, Handle<ObjectSubclass*> obj) {
+  static_assert(std::is_base_of_v<JSObject, ObjectSubclass>,
+                "ObjectSubclass must be a subclass of JSObject");
+
+  // If the provided object has a non-empty shape, it was given the cached
+  // initial shape when created: nothing to do.
+  if (!obj->empty()) {
+    return true;
+  }
+
+  // Ensure the initial shape isn't collected under assignInitialShape, to
+  // simplify insertInitialShape.
+  Rooted<Shape*> emptyShape(cx, obj->shape());
+
+  // If no initial shape was assigned, do so.
+  Rooted<SharedShape*> shape(cx, ObjectSubclass::assignInitialShape(cx, obj));
+  if (!shape) {
+    return false;
+  }
+  MOZ_ASSERT(!obj->empty());
+
+  // Cache the initial shape, so that future instances will begin life with that
+  // shape.
+  SharedShape::insertInitialShape(cx, shape);
+  return true;
+}
+
+MOZ_ALWAYS_INLINE PropMap* NativeShape::lookup(JSContext* cx, PropertyKey key,
+                                               uint32_t* index) {
+  uint32_t len = propMapLength();
+  return len > 0 ? propMap_->lookup(cx, len, key, index) : nullptr;
+}
+
+MOZ_ALWAYS_INLINE PropMap* NativeShape::lookupPure(PropertyKey key,
+                                                   uint32_t* index) {
+  uint32_t len = propMapLength();
+  return len > 0 ? propMap_->lookupPure(len, key, index) : nullptr;
+}
+
+inline void Shape::purgeCache(JS::GCContext* gcx) {
+  if (cache_.isShapeSetForAdd()) {
+    gcx->delete_(this, cache_.toShapeSetForAdd(), MemoryUse::ShapeSetForAdd);
+  }
+  cache_.setNone();
+}
+
+inline void Shape::finalize(JS::GCContext* gcx) {
+  if (!cache_.isNone()) {
+    purgeCache(gcx);
+  }
+  if (isWasmGC()) {
+    asWasmGC().finalize(gcx);
+  }
+}
+
+inline void WasmGCShape::init() { recGroup_->AddRef(); }
+
+inline void WasmGCShape::finalize(JS::GCContext* gcx) { recGroup_->Release(); }
+
+inline SharedPropMap* SharedShape::propMapMaybeForwarded() const {
+  MOZ_ASSERT(isShared());
+  PropMap* propMap = propMap_;
+  return propMap ? MaybeForwarded(propMap)->asShared() : nullptr;
+}
+
+static inline JS::PropertyAttributes GetPropertyAttributes(
+    JSObject* obj, PropertyResult prop) {
+  MOZ_ASSERT(obj->is<NativeObject>());
+
+  if (prop.isDenseElement()) {
+    return obj->as<NativeObject>().getElementsHeader()->elementAttributes();
+  }
+  if (prop.isTypedArrayElement()) {
+    return {JS::PropertyAttribute::Configurable,
+            JS::PropertyAttribute::Enumerable, JS::PropertyAttribute::Writable};
+  }
+
+  return prop.propertyInfo().propAttributes();
+}
+
+} /* namespace js */
+
+#endif /* vm_Shape_inl_h */