SharedImmutableStringsCache-inl.h (2667B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * vim: set ts=8 sts=2 et sw=2 tw=80: 3 * This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef vm_SharedImmutableStringsCache_inl_h 8 #define vm_SharedImmutableStringsCache_inl_h 9 10 #include "vm/SharedImmutableStringsCache.h" 11 12 namespace js { 13 14 template <typename IntoOwnedChars> 15 [[nodiscard]] SharedImmutableString SharedImmutableStringsCache::getOrCreate( 16 const char* chars, size_t length, IntoOwnedChars intoOwnedChars) { 17 MOZ_ASSERT(inner_); 18 MOZ_ASSERT(chars); 19 Hasher::Lookup lookup(Hasher::hashLongString(chars, length), chars, length); 20 21 auto locked = inner_->lock(); 22 auto entry = locked->set.lookupForAdd(lookup); 23 if (!entry) { 24 OwnedChars ownedChars(intoOwnedChars()); 25 if (!ownedChars) { 26 return SharedImmutableString(); 27 } 28 MOZ_ASSERT(ownedChars.get() == chars || 29 memcmp(ownedChars.get(), chars, length) == 0); 30 auto box = StringBox::Create(std::move(ownedChars), length, inner_); 31 if (!box || !locked->set.add(entry, std::move(box))) { 32 return SharedImmutableString(); 33 } 34 } 35 36 MOZ_ASSERT(entry && *entry); 37 return SharedImmutableString(entry->get()); 38 } 39 40 template <typename IntoOwnedTwoByteChars> 41 [[nodiscard]] SharedImmutableTwoByteString 42 SharedImmutableStringsCache::getOrCreate( 43 const char16_t* chars, size_t length, 44 IntoOwnedTwoByteChars intoOwnedTwoByteChars) { 45 MOZ_ASSERT(inner_); 46 MOZ_ASSERT(chars); 47 auto hash = Hasher::hashLongString(reinterpret_cast<const char*>(chars), 48 length * sizeof(char16_t)); 49 Hasher::Lookup lookup(hash, chars, length); 50 51 auto locked = inner_->lock(); 52 auto entry = locked->set.lookupForAdd(lookup); 53 if (!entry) { 54 OwnedTwoByteChars ownedTwoByteChars(intoOwnedTwoByteChars()); 55 if (!ownedTwoByteChars) { 56 return SharedImmutableTwoByteString(); 57 } 58 MOZ_ASSERT( 59 ownedTwoByteChars.get() == chars || 60 memcmp(ownedTwoByteChars.get(), chars, length * sizeof(char16_t)) == 0); 61 OwnedChars ownedChars(reinterpret_cast<char*>(ownedTwoByteChars.release())); 62 auto box = StringBox::Create(std::move(ownedChars), 63 length * sizeof(char16_t), inner_); 64 if (!box || !locked->set.add(entry, std::move(box))) { 65 return SharedImmutableTwoByteString(); 66 } 67 } 68 69 MOZ_ASSERT(entry && *entry); 70 return SharedImmutableTwoByteString(entry->get()); 71 } 72 73 } // namespace js 74 75 #endif // vm_SharedImmutableStringsCache_inl_h