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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /js/src/vm/SharedImmutableStringsCache-inl.h | |
parent | Initial commit. (diff) | |
download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/vm/SharedImmutableStringsCache-inl.h')
-rw-r--r-- | js/src/vm/SharedImmutableStringsCache-inl.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/js/src/vm/SharedImmutableStringsCache-inl.h b/js/src/vm/SharedImmutableStringsCache-inl.h new file mode 100644 index 0000000000..34690b202d --- /dev/null +++ b/js/src/vm/SharedImmutableStringsCache-inl.h @@ -0,0 +1,75 @@ +/* -*- 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_SharedImmutableStringsCache_inl_h +#define vm_SharedImmutableStringsCache_inl_h + +#include "vm/SharedImmutableStringsCache.h" + +namespace js { + +template <typename IntoOwnedChars> +[[nodiscard]] 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(); + auto entry = locked->set.lookupForAdd(lookup); + if (!entry) { + OwnedChars ownedChars(intoOwnedChars()); + if (!ownedChars) { + return SharedImmutableString(); + } + MOZ_ASSERT(ownedChars.get() == chars || + memcmp(ownedChars.get(), chars, length) == 0); + auto box = StringBox::Create(std::move(ownedChars), length, inner_); + if (!box || !locked->set.add(entry, std::move(box))) { + return SharedImmutableString(); + } + } + + MOZ_ASSERT(entry && *entry); + return SharedImmutableString(entry->get()); +} + +template <typename IntoOwnedTwoByteChars> +[[nodiscard]] 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(); + auto entry = locked->set.lookupForAdd(lookup); + if (!entry) { + OwnedTwoByteChars ownedTwoByteChars(intoOwnedTwoByteChars()); + if (!ownedTwoByteChars) { + return SharedImmutableTwoByteString(); + } + 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(std::move(ownedChars), + length * sizeof(char16_t), inner_); + if (!box || !locked->set.add(entry, std::move(box))) { + return SharedImmutableTwoByteString(); + } + } + + MOZ_ASSERT(entry && *entry); + return SharedImmutableTwoByteString(entry->get()); +} + +} // namespace js + +#endif // vm_SharedImmutableStringsCache_inl_h |