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/* -*- 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/. */
#include "vm/SharedImmutableStringsCache-inl.h"
#include "util/Text.h"
namespace js {
SharedImmutableString::SharedImmutableString(
ExclusiveData<SharedImmutableStringsCache::Inner>::Guard& locked,
SharedImmutableStringsCache::StringBox* box)
: cache_(locked), box_(box) {
MOZ_ASSERT(box);
box->refcount++;
}
SharedImmutableString::SharedImmutableString(SharedImmutableString&& rhs)
: cache_(std::move(rhs.cache_)), box_(rhs.box_) {
MOZ_ASSERT(this != &rhs, "self move not allowed");
MOZ_ASSERT(rhs.box_);
MOZ_ASSERT(rhs.box_->refcount > 0);
rhs.box_ = nullptr;
}
SharedImmutableString& SharedImmutableString::operator=(
SharedImmutableString&& rhs) {
this->~SharedImmutableString();
new (this) SharedImmutableString(std::move(rhs));
return *this;
}
SharedImmutableTwoByteString::SharedImmutableTwoByteString(
SharedImmutableString&& string)
: string_(std::move(string)) {}
SharedImmutableTwoByteString::SharedImmutableTwoByteString(
ExclusiveData<SharedImmutableStringsCache::Inner>::Guard& locked,
SharedImmutableStringsCache::StringBox* box)
: string_(locked, box) {
MOZ_ASSERT(box->length() % sizeof(char16_t) == 0);
}
SharedImmutableTwoByteString::SharedImmutableTwoByteString(
SharedImmutableTwoByteString&& rhs)
: string_(std::move(rhs.string_)) {
MOZ_ASSERT(this != &rhs, "self move not allowed");
}
SharedImmutableTwoByteString& SharedImmutableTwoByteString::operator=(
SharedImmutableTwoByteString&& rhs) {
this->~SharedImmutableTwoByteString();
new (this) SharedImmutableTwoByteString(std::move(rhs));
return *this;
}
SharedImmutableString::~SharedImmutableString() {
if (!box_) {
return;
}
auto locked = cache_.inner_->lock();
MOZ_ASSERT(box_->refcount > 0);
box_->refcount--;
if (box_->refcount == 0) {
box_->chars_.reset(nullptr);
}
}
SharedImmutableString SharedImmutableString::clone() const {
auto locked = cache_.inner_->lock();
MOZ_ASSERT(box_);
MOZ_ASSERT(box_->refcount > 0);
return SharedImmutableString(locked, box_);
}
SharedImmutableTwoByteString SharedImmutableTwoByteString::clone() const {
return SharedImmutableTwoByteString(string_.clone());
}
[[nodiscard]] mozilla::Maybe<SharedImmutableString>
SharedImmutableStringsCache::getOrCreate(OwnedChars&& chars, size_t length) {
OwnedChars owned(std::move(chars));
MOZ_ASSERT(owned);
return getOrCreate(owned.get(), length, [&]() { return std::move(owned); });
}
[[nodiscard]] mozilla::Maybe<SharedImmutableString>
SharedImmutableStringsCache::getOrCreate(const char* chars, size_t length) {
return getOrCreate(chars, length,
[&]() { return DuplicateString(chars, length); });
}
[[nodiscard]] mozilla::Maybe<SharedImmutableTwoByteString>
SharedImmutableStringsCache::getOrCreate(OwnedTwoByteChars&& chars,
size_t length) {
OwnedTwoByteChars owned(std::move(chars));
MOZ_ASSERT(owned);
return getOrCreate(owned.get(), length, [&]() { return std::move(owned); });
}
[[nodiscard]] mozilla::Maybe<SharedImmutableTwoByteString>
SharedImmutableStringsCache::getOrCreate(const char16_t* chars, size_t length) {
return getOrCreate(chars, length,
[&]() { return DuplicateString(chars, length); });
}
} // namespace js