Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 406 insertions, 0 deletions

diff --git a/dom/bindings/ToJSValue.h b/dom/bindings/ToJSValue.h
new file mode 100644
index 0000000000..fa7954656e
--- /dev/null
+++ b/dom/bindings/ToJSValue.h
@@ -0,0 +1,406 @@
+/* -*- 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_ToJSValue_h
+#define mozilla_dom_ToJSValue_h
+
+#include <cstddef>  // for size_t
+#include <cstdint>  // for int32_t, int64_t, uint32_t, uint64_t
+#include <type_traits>  // for is_base_of, enable_if_t, enable_if, is_pointer, is_same, void_t
+#include <utility>          // for forward
+#include "ErrorList.h"      // for nsresult
+#include "js/Array.h"       // for NewArrayObject
+#include "js/GCVector.h"    // for RootedVector, MutableWrappedPtrOperations
+#include "js/RootingAPI.h"  // for MutableHandle, Rooted, Handle, Heap
+#include "js/Value.h"       // for Value
+#include "js/ValueArray.h"  // for HandleValueArray
+#include "jsapi.h"          // for CurrentGlobalOrNull
+#include "mozilla/Assertions.h"  // for AssertionConditionType, MOZ_ASSERT, MOZ_ASSERT_HELPER1
+#include "mozilla/Attributes.h"        // for MOZ_MUST_USE
+#include "mozilla/UniquePtr.h"         // for UniquePtr
+#include "mozilla/Unused.h"            // for Unused
+#include "mozilla/dom/BindingUtils.h"  // for MaybeWrapValue, MaybeWrapObjectOrNullValue, XPCOMObjectToJsval, GetOrCreateDOMReflector
+#include "mozilla/dom/CallbackObject.h"  // for CallbackObject
+#include "nsID.h"                        // for NS_GET_TEMPLATE_IID, nsIID
+#include "nsISupports.h"                 // for nsISupports
+#include "nsStringFwd.h"                 // for nsAString
+#include "nsTArrayForwardDeclare.h"
+#include "xpcObjectHelper.h"  // for xpcObjectHelper
+
+namespace mozilla {
+namespace dom {
+
+class CallbackObject;
+class Promise;
+class WindowProxyHolder;
+template <typename TypedArrayType>
+class TypedArrayCreator;
+
+// If ToJSValue returns false, it must set an exception on the
+// JSContext.
+
+// Accept strings.
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const nsAString& aArgument,
+                            JS::MutableHandle<JS::Value> aValue);
+
+// Treats the input as UTF-8, and throws otherwise.
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const nsACString& aArgument,
+                            JS::MutableHandle<JS::Value> aValue);
+
+// Accept booleans.  But be careful here: if we just have a function that takes
+// a boolean argument, then any pointer that doesn't match one of our other
+// signatures/templates will get treated as a boolean, which is clearly not
+// desirable.  So make this a template that only gets used if the argument type
+// is actually boolean
+template <typename T>
+MOZ_MUST_USE std::enable_if_t<std::is_same<T, bool>::value, bool> ToJSValue(
+    JSContext* aCx, T aArgument, JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setBoolean(aArgument);
+  return true;
+}
+
+// Accept integer types
+inline bool ToJSValue(JSContext* aCx, int32_t aArgument,
+                      JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setInt32(aArgument);
+  return true;
+}
+
+inline bool ToJSValue(JSContext* aCx, uint32_t aArgument,
+                      JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setNumber(aArgument);
+  return true;
+}
+
+inline bool ToJSValue(JSContext* aCx, int64_t aArgument,
+                      JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setNumber(double(aArgument));
+  return true;
+}
+
+inline bool ToJSValue(JSContext* aCx, uint64_t aArgument,
+                      JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setNumber(double(aArgument));
+  return true;
+}
+
+// accept floating point types
+inline bool ToJSValue(JSContext* aCx, float aArgument,
+                      JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setNumber(aArgument);
+  return true;
+}
+
+inline bool ToJSValue(JSContext* aCx, double aArgument,
+                      JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setNumber(aArgument);
+  return true;
+}
+
+// Accept CallbackObjects
+MOZ_MUST_USE inline bool ToJSValue(JSContext* aCx, CallbackObject& aArgument,
+                                   JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  aValue.setObjectOrNull(aArgument.Callback(aCx));
+
+  return MaybeWrapValue(aCx, aValue);
+}
+
+// Accept objects that inherit from nsWrapperCache (e.g. most
+// DOM objects).
+template <class T>
+MOZ_MUST_USE std::enable_if_t<std::is_base_of<nsWrapperCache, T>::value, bool>
+ToJSValue(JSContext* aCx, T& aArgument, JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  return GetOrCreateDOMReflector(aCx, aArgument, aValue);
+}
+
+// Accept non-refcounted DOM objects that do not inherit from
+// nsWrapperCache.  Refcounted ones would be too much of a footgun:
+// you could convert them to JS twice and get two different objects.
+namespace binding_detail {
+template <class T>
+MOZ_MUST_USE
+    std::enable_if_t<std::is_base_of<NonRefcountedDOMObject, T>::value, bool>
+    ToJSValueFromPointerHelper(JSContext* aCx, T* aArgument,
+                               JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  // This is a cut-down version of
+  // WrapNewBindingNonWrapperCachedObject that doesn't need to deal
+  // with nearly as many cases.
+  if (!aArgument) {
+    aValue.setNull();
+    return true;
+  }
+
+  JS::Rooted<JSObject*> obj(aCx);
+  if (!aArgument->WrapObject(aCx, nullptr, &obj)) {
+    return false;
+  }
+
+  aValue.setObject(*obj);
+  return true;
+}
+}  // namespace binding_detail
+
+// We can take a non-refcounted non-wrapper-cached DOM object that lives in a
+// UniquePtr.
+template <class T>
+MOZ_MUST_USE
+    std::enable_if_t<std::is_base_of<NonRefcountedDOMObject, T>::value, bool>
+    ToJSValue(JSContext* aCx, UniquePtr<T>&& aArgument,
+              JS::MutableHandle<JS::Value> aValue) {
+  if (!binding_detail::ToJSValueFromPointerHelper(aCx, aArgument.get(),
+                                                  aValue)) {
+    return false;
+  }
+
+  // JS object took ownership
+  Unused << aArgument.release();
+  return true;
+}
+
+// Accept typed arrays built from appropriate nsTArray values
+template <typename T>
+MOZ_MUST_USE
+    typename std::enable_if<std::is_base_of<AllTypedArraysBase, T>::value,
+                            bool>::type
+    ToJSValue(JSContext* aCx, const TypedArrayCreator<T>& aArgument,
+              JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  JSObject* obj = aArgument.Create(aCx);
+  if (!obj) {
+    return false;
+  }
+  aValue.setObject(*obj);
+  return true;
+}
+
+namespace binding_detail {
+// Helper type alias for picking a script-exposable non-wrappercached XPIDL
+// interface to expose to JS code. Falls back to `nsISupports` if the specific
+// interface type is ambiguous.
+template <typename T, typename = void>
+struct GetScriptableInterfaceType {
+  using Type = nsISupports;
+
+  static_assert(std::is_base_of_v<nsISupports, T>,
+                "T must inherit from nsISupports");
+};
+template <typename T>
+struct GetScriptableInterfaceType<
+    T, std::void_t<typename T::ScriptableInterfaceType>> {
+  using Type = typename T::ScriptableInterfaceType;
+
+  static_assert(std::is_base_of_v<Type, T>,
+                "T must inherit from ScriptableInterfaceType");
+  static_assert(std::is_base_of_v<nsISupports, Type>,
+                "ScriptableInterfaceType must inherit from nsISupports");
+};
+
+template <typename T>
+using ScriptableInterfaceType = typename GetScriptableInterfaceType<T>::Type;
+}  // namespace binding_detail
+
+// Accept objects that inherit from nsISupports but not nsWrapperCache (e.g.
+// DOM File).
+template <class T>
+MOZ_MUST_USE std::enable_if_t<!std::is_base_of<nsWrapperCache, T>::value &&
+                                  !std::is_base_of<CallbackObject, T>::value &&
+                                  std::is_base_of<nsISupports, T>::value,
+                              bool>
+ToJSValue(JSContext* aCx, T& aArgument, JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  xpcObjectHelper helper(ToSupports(&aArgument));
+  JS::Rooted<JSObject*> scope(aCx, JS::CurrentGlobalOrNull(aCx));
+  const nsIID& iid =
+      NS_GET_TEMPLATE_IID(binding_detail::ScriptableInterfaceType<T>);
+  return XPCOMObjectToJsval(aCx, scope, helper, &iid, true, aValue);
+}
+
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const WindowProxyHolder& aArgument,
+                            JS::MutableHandle<JS::Value> aValue);
+
+// Accept nsRefPtr/nsCOMPtr
+template <typename T>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const nsCOMPtr<T>& aArgument,
+                            JS::MutableHandle<JS::Value> aValue) {
+  return ToJSValue(aCx, *aArgument.get(), aValue);
+}
+
+template <typename T>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const RefPtr<T>& aArgument,
+                            JS::MutableHandle<JS::Value> aValue) {
+  return ToJSValue(aCx, *aArgument.get(), aValue);
+}
+
+template <typename T>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const NonNull<T>& aArgument,
+                            JS::MutableHandle<JS::Value> aValue) {
+  return ToJSValue(aCx, *aArgument.get(), aValue);
+}
+
+// Accept WebIDL dictionaries
+template <class T>
+MOZ_MUST_USE std::enable_if_t<std::is_base_of<DictionaryBase, T>::value, bool>
+ToJSValue(JSContext* aCx, const T& aArgument,
+          JS::MutableHandle<JS::Value> aValue) {
+  return aArgument.ToObjectInternal(aCx, aValue);
+}
+
+// Accept existing JS values (which may not be same-compartment with us
+MOZ_MUST_USE inline bool ToJSValue(JSContext* aCx, const JS::Value& aArgument,
+                                   JS::MutableHandle<JS::Value> aValue) {
+  aValue.set(aArgument);
+  return MaybeWrapValue(aCx, aValue);
+}
+MOZ_MUST_USE inline bool ToJSValue(JSContext* aCx,
+                                   JS::Handle<JS::Value> aArgument,
+                                   JS::MutableHandle<JS::Value> aValue) {
+  aValue.set(aArgument);
+  return MaybeWrapValue(aCx, aValue);
+}
+
+// Accept existing JS values on the Heap (which may not be same-compartment with
+// us
+MOZ_MUST_USE inline bool ToJSValue(JSContext* aCx,
+                                   const JS::Heap<JS::Value>& aArgument,
+                                   JS::MutableHandle<JS::Value> aValue) {
+  aValue.set(aArgument);
+  return MaybeWrapValue(aCx, aValue);
+}
+
+// Accept existing rooted JS values (which may not be same-compartment with us
+MOZ_MUST_USE inline bool ToJSValue(JSContext* aCx,
+                                   const JS::Rooted<JS::Value>& aArgument,
+                                   JS::MutableHandle<JS::Value> aValue) {
+  aValue.set(aArgument);
+  return MaybeWrapValue(aCx, aValue);
+}
+
+// Accept existing rooted JS objects (which may not be same-compartment with
+// us).
+MOZ_MUST_USE inline bool ToJSValue(JSContext* aCx,
+                                   const JS::Rooted<JSObject*>& aArgument,
+                                   JS::MutableHandle<JS::Value> aValue) {
+  aValue.setObjectOrNull(aArgument);
+  return MaybeWrapObjectOrNullValue(aCx, aValue);
+}
+
+// Accept nsresult, for use in rejections, and create an XPCOM
+// exception object representing that nsresult.
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, nsresult aArgument,
+                            JS::MutableHandle<JS::Value> aValue);
+
+// Accept ErrorResult, for use in rejections, and create an exception
+// representing the failure.  Note, the ErrorResult must indicate a failure
+// with aArgument.Failure() returning true.
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, ErrorResult&& aArgument,
+                            JS::MutableHandle<JS::Value> aValue);
+
+// Accept owning WebIDL unions.
+template <typename T>
+MOZ_MUST_USE
+    std::enable_if_t<std::is_base_of<AllOwningUnionBase, T>::value, bool>
+    ToJSValue(JSContext* aCx, const T& aArgument,
+              JS::MutableHandle<JS::Value> aValue) {
+  JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));
+  return aArgument.ToJSVal(aCx, global, aValue);
+}
+
+// Accept pointers to other things we accept
+template <typename T>
+MOZ_MUST_USE std::enable_if_t<std::is_pointer<T>::value, bool> ToJSValue(
+    JSContext* aCx, T aArgument, JS::MutableHandle<JS::Value> aValue) {
+  return ToJSValue(aCx, *aArgument, aValue);
+}
+
+// Accept Promise objects, which need special handling.
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, Promise& aArgument,
+                            JS::MutableHandle<JS::Value> aValue);
+
+// Accept arrays (and nested arrays) of other things we accept
+template <typename T>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, T* aArguments, size_t aLength,
+                            JS::MutableHandle<JS::Value> aValue);
+
+template <typename T>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const nsTArray<T>& aArgument,
+                            JS::MutableHandle<JS::Value> aValue) {
+  return ToJSValue(aCx, aArgument.Elements(), aArgument.Length(), aValue);
+}
+
+template <typename T>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const FallibleTArray<T>& aArgument,
+                            JS::MutableHandle<JS::Value> aValue) {
+  return ToJSValue(aCx, aArgument.Elements(), aArgument.Length(), aValue);
+}
+
+template <typename T, int N>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, const T (&aArgument)[N],
+                            JS::MutableHandle<JS::Value> aValue) {
+  return ToJSValue(aCx, aArgument, N, aValue);
+}
+
+// Accept arrays of other things we accept
+template <typename T>
+MOZ_MUST_USE bool ToJSValue(JSContext* aCx, T* aArguments, size_t aLength,
+                            JS::MutableHandle<JS::Value> aValue) {
+  // Make sure we're called in a compartment
+  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
+
+  JS::RootedVector<JS::Value> v(aCx);
+  if (!v.resize(aLength)) {
+    return false;
+  }
+  for (size_t i = 0; i < aLength; ++i) {
+    if (!ToJSValue(aCx, aArguments[i], v[i])) {
+      return false;
+    }
+  }
+  JSObject* arrayObj = JS::NewArrayObject(aCx, v);
+  if (!arrayObj) {
+    return false;
+  }
+  aValue.setObject(*arrayObj);
+  return true;
+}
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif /* mozilla_dom_ToJSValue_h */