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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"
#include "vm/MutexIDs.h" // js::mutexid
#include "vm/Runtime.h" // JSRuntime
namespace js {
/* static */
SharedImmutableStringsCache SharedImmutableStringsCache::singleton_;
SharedImmutableString::SharedImmutableString(
SharedImmutableStringsCache::StringBox* box)
: box_(box) {
MOZ_ASSERT(box);
box->refcount++;
}
SharedImmutableString::SharedImmutableString(SharedImmutableString&& rhs)
: box_(rhs.box_) {
MOZ_ASSERT(this != &rhs, "self move not allowed");
MOZ_ASSERT_IF(rhs.box_, 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(
SharedImmutableStringsCache::StringBox* box)
: string_(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 = box_->cache_->lock();
MOZ_ASSERT(box_->refcount > 0);
box_->refcount--;
if (box_->refcount == 0) {
box_->chars_.reset(nullptr);
}
}
SharedImmutableString SharedImmutableString::clone() const {
auto locked = box_->cache_->lock();
MOZ_ASSERT(box_);
MOZ_ASSERT(box_->refcount > 0);
return SharedImmutableString(box_);
}
SharedImmutableTwoByteString SharedImmutableTwoByteString::clone() const {
return SharedImmutableTwoByteString(string_.clone());
}
[[nodiscard]] 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]] SharedImmutableString SharedImmutableStringsCache::getOrCreate(
const char* chars, size_t length) {
return getOrCreate(chars, length,
[&]() { return DuplicateString(chars, length); });
}
bool SharedImmutableStringsCache::init() {
MOZ_ASSERT(!inner_);
auto* inner =
js_new<ExclusiveData<Inner>>(mutexid::SharedImmutableStringsCache);
if (!inner) {
return false;
}
auto locked = inner->lock();
inner_ = locked.parent();
return true;
}
void SharedImmutableStringsCache::free() {
if (inner_) {
js_delete(inner_);
inner_ = nullptr;
}
}
bool SharedImmutableStringsCache::initSingleton() { return singleton_.init(); }
void SharedImmutableStringsCache::freeSingleton() {
if (!JSRuntime::hasLiveRuntimes()) {
singleton_.free();
}
}
[[nodiscard]] 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]] SharedImmutableTwoByteString
SharedImmutableStringsCache::getOrCreate(const char16_t* chars, size_t length) {
return getOrCreate(chars, length,
[&]() { return DuplicateString(chars, length); });
}
} // namespace js
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