1 files changed, 92 insertions, 0 deletions
diff --git a/dom/bindings/WebIDLGlobalNameHash.h b/dom/bindings/WebIDLGlobalNameHash.h
new file mode 100644
index 0000000000..bbe047d4d3
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+++ b/dom/bindings/WebIDLGlobalNameHash.h
@@ -0,0 +1,92 @@
+/* -*- 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 mozilla_dom_WebIDLGlobalNameHash_h__
+#define mozilla_dom_WebIDLGlobalNameHash_h__
+
+#include "js/RootingAPI.h"
+#include "nsTArray.h"
+#include "mozilla/dom/BindingDeclarations.h"
+
+class JSLinearString;
+
+namespace mozilla::dom {
+
+enum class BindingNamesOffset : uint16_t;
+
+namespace constructors::id {
+enum ID : uint16_t;
+}  // namespace constructors::id
+
+struct WebIDLNameTableEntry {
+  // Check whether a constructor should be enabled for the given object.
+  // Note that the object should NOT be an Xray, since Xrays will end up
+  // defining constructors on the underlying object.
+  using ConstructorEnabled = bool (*)(JSContext* cx, JS::Handle<JSObject*> obj);
+
+  BindingNamesOffset mNameOffset;
+  uint16_t mNameLength;
+  constructors::id::ID mConstructorId;
+  CreateInterfaceObjectsMethod mCreate;
+  // May be null if enabled unconditionally
+  ConstructorEnabled mEnabled;
+};
+
+class WebIDLGlobalNameHash {
+ public:
+  using ConstructorEnabled = WebIDLNameTableEntry::ConstructorEnabled;
+
+  // Returns false if something failed. aFound is set to true if the name is in
+  // the hash, whether it's enabled or not.
+  static bool DefineIfEnabled(
+      JSContext* aCx, JS::Handle<JSObject*> aObj, JS::Handle<jsid> aId,
+      JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> aDesc,
+      bool* aFound);
+
+  static bool MayResolve(jsid aId);
+
+  // The type of names we're asking for.
+  enum NameType {
+    // All WebIDL names enabled for aObj.
+    AllNames,
+    // Only the names that are enabled for aObj and have not been resolved for
+    // aObj in the past (and therefore can't have been deleted).
+    UnresolvedNamesOnly
+  };
+  // Returns false if an exception has been thrown on aCx.
+  static bool GetNames(JSContext* aCx, JS::Handle<JSObject*> aObj,
+                       NameType aNameType,
+                       JS::MutableHandleVector<jsid> aNames);
+
+  // Helpers for resolving & enumerating names on the system global.
+  // NOTE: These are distinct as it currently lacks a ProtoAndIfaceCache, and is
+  // an XPCOM global.
+  static bool ResolveForSystemGlobal(JSContext* aCx, JS::Handle<JSObject*> aObj,
+                                     JS::Handle<jsid> aId, bool* aResolvedp);
+
+  static bool NewEnumerateSystemGlobal(
+      JSContext* aCx, JS::Handle<JSObject*> aObj,
+      JS::MutableHandleVector<jsid> aProperties, bool aEnumerableOnly);
+
+ private:
+  friend struct WebIDLNameTableEntry;
+
+  // Look up an entry by key name. `nullptr` if the entry was not found.
+  // The impl of GetEntry is generated by Codegen.py in RegisterBindings.cpp
+  static const WebIDLNameTableEntry* GetEntry(JSLinearString* aKey);
+
+  // The total number of names in the hash.
+  // The value of sCount is generated by Codegen.py in RegisterBindings.cpp.
+  static const uint32_t sCount;
+
+  // The name table entries in the hash.
+  // The value of sEntries is generated by Codegen.py in RegisterBindings.cpp.
+  static const WebIDLNameTableEntry sEntries[];
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_WebIDLGlobalNameHash_h__