1 files changed, 153 insertions, 0 deletions
diff --git a/js/xpconnect/loader/ScriptPreloader-inl.h b/js/xpconnect/loader/ScriptPreloader-inl.h
new file mode 100644
index 0000000000..86422ad084
--- /dev/null
+++ b/js/xpconnect/loader/ScriptPreloader-inl.h
@@ -0,0 +1,153 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* 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 ScriptPreloader_inl_h
+#define ScriptPreloader_inl_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/EnumSet.h"
+#include "mozilla/Range.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+#include <prio.h>
+
+namespace mozilla {
+
+namespace loader {
+
+using mozilla::dom::AutoJSAPI;
+
+static inline Result<Ok, nsresult> Write(PRFileDesc* fd, const void* data,
+                                         int32_t len) {
+  if (PR_Write(fd, data, len) != len) {
+    return Err(NS_ERROR_FAILURE);
+  }
+  return Ok();
+}
+
+struct MOZ_RAII AutoSafeJSAPI : public AutoJSAPI {
+  AutoSafeJSAPI() { Init(); }
+};
+
+template <typename T>
+struct Matcher;
+
+// Wraps the iterator for a nsTHashTable so that it may be used as a range
+// iterator. Each iterator result acts as a smart pointer to the hash element,
+// and has a Remove() method which will remove the element from the hash.
+//
+// It also accepts an optional Matcher instance against which to filter the
+// elements which should be iterated over.
+//
+// Example:
+//
+//    for (auto& elem : HashElemIter<HashType>(hash)) {
+//        if (elem->IsDead()) {
+//            elem.Remove();
+//        }
+//    }
+template <typename T>
+class HashElemIter {
+  using Iterator = typename T::Iterator;
+  using ElemType = typename T::UserDataType;
+
+  T& hash_;
+  Matcher<ElemType>* matcher_;
+  Maybe<Iterator> iter_;
+
+ public:
+  explicit HashElemIter(T& hash, Matcher<ElemType>* matcher = nullptr)
+      : hash_(hash), matcher_(matcher) {
+    iter_.emplace(std::move(hash.Iter()));
+  }
+
+  class Elem {
+    friend class HashElemIter<T>;
+
+    HashElemIter<T>& iter_;
+    bool done_;
+
+    Elem(HashElemIter& iter, bool done) : iter_(iter), done_(done) {
+      skipNonMatching();
+    }
+
+    Iterator& iter() { return iter_.iter_.ref(); }
+
+    void skipNonMatching() {
+      if (iter_.matcher_) {
+        while (!done_ && !iter_.matcher_->Matches(get())) {
+          iter().Next();
+          done_ = iter().Done();
+        }
+      }
+    }
+
+   public:
+    Elem& operator*() { return *this; }
+
+    ElemType get() {
+      if (done_) {
+        return nullptr;
+      }
+      return iter().UserData();
+    }
+
+    const ElemType get() const { return const_cast<Elem*>(this)->get(); }
+
+    ElemType operator->() { return get(); }
+
+    const ElemType operator->() const { return get(); }
+
+    operator ElemType() { return get(); }
+
+    void Remove() { iter().Remove(); }
+
+    Elem& operator++() {
+      MOZ_ASSERT(!done_);
+
+      iter().Next();
+      done_ = iter().Done();
+
+      skipNonMatching();
+      return *this;
+    }
+
+    bool operator!=(Elem& other) {
+      return done_ != other.done_ || this->get() != other.get();
+    }
+  };
+
+  Elem begin() { return Elem(*this, iter_->Done()); }
+
+  Elem end() { return Elem(*this, true); }
+};
+
+template <typename T>
+HashElemIter<T> IterHash(T& hash,
+                         Matcher<typename T::UserDataType>* matcher = nullptr) {
+  return HashElemIter<T>(hash, matcher);
+}
+
+template <typename T, typename F>
+bool Find(T&& iter, F&& match) {
+  for (auto& elem : iter) {
+    if (match(elem)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+};  // namespace loader
+};  // namespace mozilla
+
+#endif  // ScriptPreloader_inl_h