Add m-esr52 at 52.6.0

1 files changed, 76 insertions, 0 deletions

diff --git a/js/src/vm/SharedImmutableStringsCache-inl.h b/js/src/vm/SharedImmutableStringsCache-inl.h
new file mode 100644
index 000000000..6a6373c0a
--- /dev/null
+++ b/js/src/vm/SharedImmutableStringsCache-inl.h
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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_SharedImmutableStringsCache_inl_h
+#define vm_SharedImmutableStringsCache_inl_h
+
+#include "vm/SharedImmutableStringsCache.h"
+
+namespace js {
+
+template <typename IntoOwnedChars>
+MOZ_MUST_USE mozilla::Maybe<SharedImmutableString>
+SharedImmutableStringsCache::getOrCreate(const char* chars, size_t length,
+                                         IntoOwnedChars intoOwnedChars)
+{
+    MOZ_ASSERT(inner_);
+    MOZ_ASSERT(chars);
+    Hasher::Lookup lookup(Hasher::hashLongString(chars, length), chars, length);
+
+    auto locked = inner_->lock();
+    if (!locked->set.initialized() && !locked->set.init())
+        return mozilla::Nothing();
+
+    auto entry = locked->set.lookupForAdd(lookup);
+    if (!entry) {
+        OwnedChars ownedChars(intoOwnedChars());
+        if (!ownedChars)
+            return mozilla::Nothing();
+        MOZ_ASSERT(ownedChars.get() == chars ||
+                   memcmp(ownedChars.get(), chars, length) == 0);
+        auto box = StringBox::Create(mozilla::Move(ownedChars), length);
+        if (!box || !locked->set.add(entry, mozilla::Move(box)))
+            return mozilla::Nothing();
+    }
+
+    MOZ_ASSERT(entry && *entry);
+    return mozilla::Some(SharedImmutableString(locked, entry->get()));
+}
+
+template <typename IntoOwnedTwoByteChars>
+MOZ_MUST_USE mozilla::Maybe<SharedImmutableTwoByteString>
+SharedImmutableStringsCache::getOrCreate(const char16_t* chars, size_t length,
+                                         IntoOwnedTwoByteChars intoOwnedTwoByteChars) {
+    MOZ_ASSERT(inner_);
+    MOZ_ASSERT(chars);
+    auto hash = Hasher::hashLongString(reinterpret_cast<const char*>(chars),
+                                       length * sizeof(char16_t));
+    Hasher::Lookup lookup(hash, chars, length);
+
+    auto locked = inner_->lock();
+    if (!locked->set.initialized() && !locked->set.init())
+        return mozilla::Nothing();
+
+    auto entry = locked->set.lookupForAdd(lookup);
+    if (!entry) {
+        OwnedTwoByteChars ownedTwoByteChars(intoOwnedTwoByteChars());
+        if (!ownedTwoByteChars)
+            return mozilla::Nothing();
+        MOZ_ASSERT(ownedTwoByteChars.get() == chars ||
+                   memcmp(ownedTwoByteChars.get(), chars, length * sizeof(char16_t)) == 0);
+        OwnedChars ownedChars(reinterpret_cast<char*>(ownedTwoByteChars.release()));
+        auto box = StringBox::Create(mozilla::Move(ownedChars), length * sizeof(char16_t));
+        if (!box || !locked->set.add(entry, mozilla::Move(box)))
+            return mozilla::Nothing();
+    }
+
+    MOZ_ASSERT(entry && *entry);
+    return mozilla::Some(SharedImmutableTwoByteString(locked, entry->get()));
+}
+
+} // namespace js
+
+#endif // vm_SharedImmutableStringsCache_inl_h