| // Copyright 2020 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "src/tint/utils/symbol/symbol_table.h" |
| |
| #include "src/tint/utils/ice/ice.h" |
| |
| namespace tint { |
| |
| SymbolTable::SymbolTable(tint::GenerationID generation_id) : generation_id_(generation_id) {} |
| |
| SymbolTable::SymbolTable(SymbolTable&&) = default; |
| |
| SymbolTable::~SymbolTable() = default; |
| |
| SymbolTable& SymbolTable::operator=(SymbolTable&&) = default; |
| |
| Symbol SymbolTable::Register(std::string_view name) { |
| TINT_ASSERT(!name.empty()); |
| |
| auto it = name_to_symbol_.Find(name); |
| if (it) { |
| return *it; |
| } |
| return RegisterInternal(name); |
| } |
| |
| Symbol SymbolTable::RegisterInternal(std::string_view name) { |
| char* name_mem = Bitcast<char*>(name_allocator_.Allocate(name.length() + 1)); |
| if (name_mem == nullptr) { |
| TINT_ICE() << "failed to allocate memory for symbol's string"; |
| return Symbol(); |
| } |
| |
| memcpy(name_mem, name.data(), name.length() + 1); |
| std::string_view nv(name_mem, name.length()); |
| |
| Symbol sym(next_symbol_, generation_id_, nv); |
| ++next_symbol_; |
| name_to_symbol_.Add(sym.NameView(), sym); |
| |
| return sym; |
| } |
| |
| Symbol SymbolTable::Get(std::string_view name) const { |
| auto it = name_to_symbol_.Find(name); |
| return it ? *it : Symbol(); |
| } |
| |
| Symbol SymbolTable::New(std::string_view prefix_view /* = "" */) { |
| std::string prefix; |
| if (prefix_view.empty()) { |
| prefix = "tint_symbol"; |
| } else { |
| prefix = std::string(prefix_view); |
| } |
| |
| auto it = name_to_symbol_.Find(prefix); |
| if (!it) { |
| return RegisterInternal(prefix); |
| } |
| |
| size_t i = 0; |
| auto last_prefix = last_prefix_to_index_.Find(prefix); |
| if (last_prefix) { |
| i = *last_prefix; |
| } |
| |
| std::string name; |
| do { |
| ++i; |
| name = prefix + "_" + std::to_string(i); |
| } while (name_to_symbol_.Contains(name)); |
| |
| auto sym = RegisterInternal(name); |
| if (last_prefix) { |
| *last_prefix = i; |
| } else { |
| last_prefix_to_index_.Add(prefix, i); |
| } |
| return sym; |
| } |
| |
| } // namespace tint |