mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2020 Telegram Systems LLP
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*/
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#include "atom.h"
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namespace vm {
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using td::Ref;
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std::atomic<Atom*> Atom::hashtable[hashtable_size] = {};
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std::atomic<int> Atom::atoms_defined{0};
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std::atomic<int> Atom::anon_atoms{0};
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void Atom::print_to(std::ostream& os) const {
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if (name_.empty()) {
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os << "atom#" << index_;
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} else {
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os << name_;
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}
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}
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std::string Atom::make_name() const {
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char buffer[16];
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sprintf(buffer, "atom#%d", index_);
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return buffer;
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}
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std::ostream& operator<<(std::ostream& os, const Atom& atom) {
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atom.print_to(os);
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return os;
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}
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std::ostream& operator<<(std::ostream& os, Ref<Atom> atom_ref) {
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atom_ref->print_to(os);
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return os;
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}
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std::pair<unsigned, unsigned> Atom::compute_hash(td::Slice name) {
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unsigned h1 = 1, h2 = 1;
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for (std::size_t i = 0; i < name.size(); i++) {
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h1 = (239 * h1 + (unsigned char)name[i]) % hashtable_size;
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h2 = (17 * h2 + (unsigned char)name[i]) % (hashtable_size - 1);
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}
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return std::make_pair(h1, h2 + 1);
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}
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Ref<Atom> Atom::find(td::Slice name, bool create) {
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auto hash = compute_hash(name);
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while (true) {
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auto& pos = hashtable[hash.first];
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Atom* ptr = pos.load(std::memory_order_acquire);
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if (ptr) {
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if (ptr->name_as_slice() == name) {
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return Ref<Atom>(ptr);
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}
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} else if (!create) {
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return {};
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} else {
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Atom* p2 = new Atom(name.str(), hash.first);
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Atom* p1 = nullptr;
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if (pos.compare_exchange_strong(p1, p2)) {
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atoms_defined.fetch_add(1, std::memory_order_relaxed);
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return Ref<Atom>(p2);
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}
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delete p2;
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CHECK(p1);
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if (p1->name_as_slice() == name) {
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return Ref<Atom>(p1);
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}
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}
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hash.first += hash.second;
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if (hash.first >= hashtable_size) {
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hash.first -= hashtable_size;
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}
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}
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}
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Ref<Atom> Atom::anon() {
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int c = anon_atoms.fetch_add(1, std::memory_order_relaxed);
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return Ref<Atom>{true, "", ~c};
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}
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} // namespace vm
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